CN117005328A - Translation template system of cast-in-situ box girder and construction method thereof - Google Patents

Abstract

The invention belongs to a translational formwork system for cast-in-place box beams and a construction method thereof. It is composed of a translational frame system for cast-in-place box beams and a formwork system on it. The invention replaces the traditional hanging basket for suspended casting of cast-in-place box beams. In construction, the traditional cantilever hanging basket construction is eliminated, and there are no shortcomings of hanging basket construction. During the suspension casting construction of the cast-in-place box girder, the translation formwork system of the cast-in-place box girder is used as the overall suspended casting system of the various components and formwork of the cast-in-situ box girder. Then when the next box girder to be cast-in-situ is suspended and cast, The box girder's translation formwork system moves as a whole to the construction space of the next box girder to be poured. The present invention can adjust the distance between each formwork telescopic screw, the oblique telescopic screw and the limiting slide rod in each ball head seat and the corresponding screw hole seat or sliding rod seat, so that the foldable side formwork and the side wing formwork can be placed on the suspension frame body. Therefore, the present invention can be conveniently adapted to the cast-in-place construction of cast-in-place box beams with different cross-section sizes, and has the advantages of fast moving speed, less damage to the overall structure of the bridge deck, simple process, and saving time and effort.

Description

A translational formwork system for cast-in-place box beams and its construction method

Technical field

The invention belongs to a translational formwork system for cast-in-place box beams and a construction method thereof.

Background technique

In the field of bridge construction, the prestressed concrete box girders of the upper main deck structure of cable-stayed bridges are mostly constructed using traditional hanging basket suspension casting. That is, after each A-type cable tower is completed, the bracket method is used to construct the main tower position first. Prestressed concrete box girder, and then use the hanging basket suspended casting construction method to cantilever cast each segment box beam with subsequent sequence numbers on the side span side and main span side. After the suspension casting construction of each segment box beam is completed, proceed to each section The hanging ropes and tensioning construction of the box girder section are carried out, and then the formwork and bracket system suspended on the front of the hanging basket are first removed, and then the unloaded hanging basket is moved forward to the next box girder section for cyclic construction. Nowadays, cantilever hanging basket construction is used in the construction of each segment box girder. The hanging basket is actually a mobile formwork system built on site. The traditional hanging basket structure includes diamond brackets, hanging basket front slings, hanging basket rear slings, and counterweights. Anchor structure, advance system and hanging basket formwork, etc. Among them, the diamond bracket is the main structure of the hanging basket. The bottom longitudinal beam of the diamond bracket is placed on the formed box girder deck, and the top longitudinal beam of the diamond bracket is extended to the box to be poured. The upper end of the beam body is in the air and is connected to the front and rear slings of the hanging basket, the horizontal and vertical brackets and the hanging basket formwork to form a suspended hanging basket formwork system for the box beam to be poured.

At present, the hanging basket needs to be moved forward on the formed box girder deck as the suspended cast box girder extends. Traditional hanging baskets adopt an orbital overall forward movement system, that is, the diamond bracket needs to be removed before each hanging basket is moved. The top longitudinal beam extends outward to the upper end of the box beam to be poured. The front and rear hanging basket straps, transverse and longitudinal brackets and hanging basket formwork are connected in the air to form the suspended hanging basket formwork system of the box beam to be poured. Drop load, and then lay the longitudinal track on the formed bridge deck in the direction of the hanging basket. Since the center of gravity of the hanging basket is in the front, the lower end of the longitudinal track needs to be placed on the pedestal, and both the pedestal and the longitudinal track need to be Anchored with bridge deck box girders. Then, use a winch, hydraulic push rod, or hand chain hoist to drag the hanging basket forward slowly. After the hanging basket moves forward for a period, it is necessary to re-anchor the hanging basket and the longitudinal rail. After the hanging basket is in place, remove the previous set of bases and longitudinal rails to prepare for the next set of laying. During construction, the diamond-shaped brackets need to be installed. The suspended basket formwork system of the box beams to be cast is re-arranged on the top.

The existing hanging basket weighs a lot, and the overall forward movement of the hanging basket takes a long time and is inefficient. It also requires repeated anchoring of the hanging basket and longitudinal movement of the track. After the hanging basket is moved in place, it needs to be repeatedly repositioned on the top of the diamond-shaped bracket of the hanging basket. The suspended hanging basket formwork system for laying out the box beams to be poured needs to be disassembled and installed repeatedly as the hanging basket moves forward, which is labor-intensive and labor-intensive. Moreover, the hanging basket has too many anchor points, which can easily cause damage to the overall structure of the bridge deck. During the walking process, at least Several dozen people cooperated. The track laying process requires the guidance of surveyors, which is a tedious, complex, time-consuming and labor-intensive process. At the same time, there is a risk of derailment and rail sliding during the forward movement.

Contents of the invention

The purpose of this invention is to design a translational formwork system for cast-in-place box girders and a construction method thereof, which can replace traditional hanging baskets for suspended casting construction of cast-in-place box girders. It has the characteristics of fast movement, no need to dismantle the formwork system, process saving, and bridge alignment. It has the advantages of less damage to the overall structure of the surface, simple process, saving time and effort.

To this end, the present invention provides a translational formwork system for cast-in-place box beams and its construction method. The construction method includes the following steps:

(1) Prepare the rack formwork system in advance. After each A-type cable tower is completed, use the bracketing method to cast-in-situ the No. 0 prestressed concrete box beam located at the position of each main tower, and prestress the No. 0 block The reserved anchoring holes for the rear end anchorage positions of the top longitudinal beams are pre-embedded in the surface of the concrete box girder, and are then prepared on the surface of the No. 0 prestressed concrete box girder. Install the folding side formwork and bottom formwork in the formwork system on the suspension frame;

Prepare suspenders, straps, gaskets, fastening nuts, counterweights, clamps and longitudinal square timbers, transverse square timbers, front, side, bottom and inner formwork;

(2) Installation of the translation frame of the cast-in-place box girder:

(a) The translation frame system is mainly composed of several roof longitudinal beams, roof beams, roof inclined reinforcement plates, hanger beams, hanger longitudinal beams, hanger cross beams, stretch beams, hanger rods, and anchor rods. Several of them are spaced apart. The middle and rear parts of the distributed top longitudinal beams are located on the top surface of the formed box beams. The front part of the top longitudinal beams is exposed at the upper end of the box beam space to be poured, and the front part of each top longitudinal beam is exposed outside the space of the box beams to be cast. The lower end is equipped with a suspension frame surrounding the box beam to be poured. The upper parts of the front and rear ends of each roof longitudinal beam are connected together with the front and rear roof beams. The upper parts of each roof longitudinal beam between the front and rear roof beams are in the form of There are several top beams spaced apart;

Correspond to the reserved anchoring holes on the top surface of the prestressed concrete box beam of block 0. Use a forklift to place the top longitudinal beams side by side at intervals. The front part of each top longitudinal beam is exposed outside the space of the box beam to be cast. The upper end of each top longitudinal beam protruding out of the space of the box beam to be cast is provided with a suspension frame surrounding the box beam to be cast;

The suspension frame body is composed of top longitudinal beams on both sides of the front part or front top cross beams on both sides of the front part or both sides of the top cross beam are respectively fixed as one with the upper ends of several suspending beams, and the lower ends of each suspending beam are hung downwardly on the to-be-used hanger. On both sides of the lower end of the cast box beam, the hanger beams are located outside both sides of the space of the box beam to be cast. The lower ends of the hanger beams on both sides are respectively fixed to the two ends of the hanger longitudinal beams. Each hanger longitudinal beam is connected to the top longitudinal beam on the corresponding side. Or there are several reinforced hanger inclined columns distributed diagonally on both sides of the front roof beam or roof beam, and there are several hanging beams distributed at intervals between the front and rear of the hanger longitudinal beams on both sides. Hanger beams, each hanger beam is provided with a number of pole beams at intervals, and there are hanger rods on the front and rear ends of the several pole beams or the hanger beams supported by the front and rear ends and the lower end of the pole beam and the corresponding formwork. Perforations, the top longitudinal beam or front top beam or top beam corresponding to the vertical upper end of each boom perforation is also provided with a boom perforation;

(b) One movable height-adjusting support at the lower part of the front end of each roof longitudinal beam is located on the top surface of the front end of the completed box beam, and the other mobile height-adjusting support is located on the top surface of the completed box beam at the lower part of the rear end of the same roof longitudinal beam. The middle and rear lower end of the top longitudinal beam is located on the front and rear movable height-adjusting supports. The top longitudinal beam at the front end of each movable height-adjusting support extends to the space of the next adjacent segment to be poured, and the end head extends to the segment space to be poured. Outside the pouring section space, the rear part of each top longitudinal beam is anchored to the top surface of the formed box beam by anchor rods passing through the reserved anchor holes in the corresponding parts and using anchor pads and anchor fastening nuts. The upper parts of the front and rear ends are respectively fixed with front and rear roof beams through bolts or welding. There are several roof beams fixed at intervals on the upper parts of each roof longitudinal beam between the front and rear roof beams. The rear parts of each roof longitudinal beam There is a counterweight block on top;

(3) Installation of the formwork system on the suspension frame, including the installation of the bottom formwork, folding side formwork and inner formwork:

(a) Installation of the bottom formwork: On the upper end of several longitudinal support beams of the suspension support frame, transverse square timbers, longitudinal square timbers, and bottom formwork are arranged from bottom to top. The front end of the support beam and the two ends of the hanger longitudinal beam are In the construction anchorway, there are connecting straps between each beam of the construction anchorway and the corresponding roof longitudinal beam or front roof beam or roof beam at the upper end;

(b) Installation of the folding side formwork: The lower end surfaces of the two folding side formworks are respectively supported on the upper ends of both sides of the corresponding bottom formwork. The folding side formwork consists of three side lower formwork and side upper formwork connected by transverse shafts. It consists of several ball head seats at intervals on the rear end faces of the lower side formwork, the upper side formwork and the side wing formwork. There are corresponding hanger beams and the upper shaft of the inclined column of the reinforced hanger on both sides of the suspension frame. Set up several screw hole seats and sliding rod seats corresponding to the ball head seats on the rear end surface of the folding side formwork. Install the folding side formwork on the inside of the hanging beams on both sides and the inclined columns of the reinforced hanger. They are located on the telescopic screws and slopes of the formwork. The ball head at one end of the telescopic screw and the limit slide rod is respectively axially installed in the ball head seat of the corresponding part. The other ends of the template telescopic screw, the oblique telescopic screw and the limit slide rod are respectively screwed or slidably connected to the corresponding screw hole seats. And in the sliding rod seat, the sliding rod seat is provided with a fastening screw connected to the sliding rod seat hole, and the middle part of each template telescopic screw, oblique telescopic screw, and limit sliding rod is provided with a handle rod or push rod;

(c) Installation of the inner formwork: The installation of the inner formwork is carried out after the concrete pouring of the box girder bottom plate is completed. The inner formwork consists of the inner formwork and the inner top formwork. The upper edge of the inner formwork is connected to the corresponding sides of the inner roof formwork. The bolts are screwed together, and the lower end face of the inner side formwork is held against the corresponding upper end face of the box beam bottom plate concrete. There is a telescopic ejector rod between the two inner formworks in the same cave;

(4) Use several booms to vertically pass through the boom holes on the corresponding structure from top to bottom, and the threaded part at the lower end of the boom is screwed to the lower boom fixing nut fixed on the bottom surface structure of the boom hole, And the threaded part at the upper end of the boom fixes the front and rear ends of several pole beams or the hanger beams supported by the front and rear ends and lower ends of the pole beams to the top longitudinal beam or the front roof beam or the roof through the gasket and the boom tension nut. At the lower end of the cross beam, the suspension frame forms a suspension support frame that supports the formwork system of the box beam to be poured and can slide or be fixed synchronously with the top longitudinal beam;

(5) Concrete pouring on suspended support frame:

(a) Test the pressure on the bottom formwork. After the pressure test, install the end formwork, install the bottom plate steel bars, set the side formwork steel bars, longitudinal corrugated pipes, reserved anchor holes, install the vertical prestressed bars, and then install the box girder bottom plate. For concrete pouring, the concrete is pumped into the mold, and the concrete discharge height is within 1m. The two sides are poured first, and then the middle is poured in layers;

(b) Then lay out the inner formwork on the concrete floor of the box girder, install the folding side formwork, front sealing plate, lay out the steel bars in each formwork, lay out the cable fasteners and fix them with the corresponding steel bars, longitudinally , Installation of transverse corrugated pipes, setting of reserved anchor holes, setting of boom tubes or anti-adhesion layers on the outside of the boom, inspection and acceptance, and then concrete pouring of the box girder webs, the concrete drop height should be within 1m, and layered The pouring height should be within 30cm. The concrete pouring of the box girder roof and wing panels should be carried out from the front end to the rear end, from the middle of the roof panel to both sides, and finally the wing panels of this section are poured;

(6) Remove the cast concrete and end formwork and chisel the end concrete;

(7) Demolding of each formwork: Remove several telescopic ejector pins holding the two inner formworks.

Unmoulding the foldable side formwork: First, use the handle rod to turn the oblique telescopic screw to shorten the distance between the ball head seat on the side wing formwork and the corresponding screw hole seat or slide rod seat, so that the side wing formwork moves toward the two sides of the corresponding rear suspension frame. Close the side hanging beams or reinforced hanger inclined columns to complete the demoulding of the side formwork and the upper end of the side wall of the poured box beam concrete; then, loosen the upper and lower side formwork on the rear end hanging beams or reinforced hanger inclined columns. Use the fastening screw corresponding to the slide rod seat hole to make the limit slide rod in the slide rod seat hole in a loose state. Use the handle rod to turn the telescopic screw of each template to shorten the ball head seats on the upper and lower templates and the corresponding screws. The distance within the hole seat or sliding rod seat allows the side upper and lower formwork to approach the hanging beams or reinforced hanger inclined columns on both sides of the corresponding rear suspension frame body, and complete the side upper and lower formwork and poured box beam concrete. Demolding the upper and lower ends of the side walls;

Demolding of the inner formwork: Remove the telescopic ejector rods held between the two inner formworks, remove the connecting bolts between the upper edge of the inner formwork and the corresponding sides of the inner roof formwork, and complete the inner formwork and inner roof. Demoulding of the formwork; after the inner formwork is separated from the inner working hole wall of the poured concrete for a certain distance, it is still located in the inner working hole of the poured concrete;

(8) Complete the longitudinal, transverse and vertical prestressed tendon tensioning and grouting in the tensioning holes; or for blocks with hanging cables, the layout and traction of the left and right stay cables;

(9) Forward movement of the cast-in-place box girder translation frame system with formwork system: Turn the boom handle at the upper end of each boom to drive each boom to rotate, so that the external threaded part at the lower end of the boom is in contact with the lower hanging fixed on the corresponding structure. Disengage the rod fixing nut from the screw connection, and remove each suspender rod upward from each top longitudinal beam or front connecting beam; remove the slings and anchor rods on each top longitudinal beam or front connecting beam that are involved with the Jitao box beam. Loosen and remove them, and increase the number of counterweights located at the rear of each top longitudinal beam, so that there is no fixed connection between the front and rear ends of each top longitudinal beam and the suspension support frame and the corresponding cast box beam. , use a forklift or bulldozer to lift the rear end of each top longitudinal beam, and slowly and synchronously translate the translation rack system of the cast-in-place box beam with the formwork system forward, so that the front part of each top longitudinal beam is exposed to the space of the next box beam to be cast. At the upper end, the suspension frame body with the formwork system is moved to the space of the next box beam to be cast and surrounded by the outer space around the next box beam to be cast;

(10) Repeat steps (4) to (9) to continue the construction of the next box beam to be cast and the forward movement of the cast-in-place box beam translation frame system with the formwork system;

(11) Construction of side-span Helong section and mid-span Helong section.

As a further description of the above technical solution: the foldable side formwork is: the foldable side formwork is composed of three horizontally connected lower side formworks, upper side formworks and side wing formworks. The lower edge of the side lower formwork is located corresponding to the bottom formwork. On the side, the upper end edge of the side lower formwork and the lower end edge of the side upper formwork are hinged through hinges. The upper end edge of the side upper formwork and the lower end edge of the side wing formwork are also hinged through hinges. There are horizontal intervals on the rear end of the side lower formwork at the lower end of the hinge. There are several ball head seats at a distance. There are several screw hole seats corresponding to each ball head seat on the horizontal corresponding suspension beams or reinforced hanger inclined columns on both sides of the suspension frame. The ball seats at one end of the telescopic screw of each template The heads are respectively axially installed in the ball head seats of the corresponding parts, and the other ends of the telescopic screws of each template are screwed in the screw holes of the screw hole seats of the corresponding parts;

A number of ball head seats are arranged at horizontal intervals on the middle part of the rear end face of the side wing formwork, and a number of ball head seats corresponding to each ball head seat are provided on the corresponding hanger beams or the inclined columns of the reinforced hanger diagonally downward on both sides of the suspension frame body. A screw hole seat, the ball head located at one end of each oblique telescopic screw rod is respectively installed in the ball head seat of the corresponding part, and the other end of each oblique telescopic screw rod is screwed in the screw hole of the screw hole seat of the corresponding part;

A number of ball joint seats are arranged transversely at intervals on the lower part of the rear end face of the side lower formwork and the upper part of the rear end face of the side upper formwork, and the upper shafts of corresponding hanger beams or reinforced hanger inclined columns on both sides of the suspension frame are arranged with each There are several sliding rod seats corresponding to the ball head seats. The ball heads located at one end of each limiting slide rod are respectively axially located in the ball head seats of the corresponding parts. The other ends of each limiting sliding rods are respectively slidably fitted on the sliding rods of the corresponding parts. In the sliding hole of the seat, the sliding rod seat is provided with a fastening screw that communicates with the sliding rod seat hole;

The middle part of each template telescopic screw, oblique telescopic screw and limit sliding rod is provided with a handle rod or push rod.

As a further description of the above technical solution: when pouring the concrete box beam to be poured, the side lower formwork, side upper formwork and side wing formwork of the foldable side formwork are adjusted by adjusting the expansion screws, oblique expansion screws and limiting slide rods of each formwork. The distance between each ball head seat and the corresponding screw hole seat or slide rod seat is such that the panels of the lower side template and the upper side template are in the same plane, and the side template is in the set position, and then use plastic at the panel hinge joints. Adhesive closure creates a seamless flat panel.

As a further description of the above technical solution: the method according to claim 1, characterized in that: the inner template is composed of two L-shaped inner mold side templates that are adapted to the shape of both sides of the cave wall and an upper end surface of the cave wall. It is composed of an inner mold top formwork with an adapted shape. The upper and lower end surfaces of the inner mold side formwork and the inner mold top formwork are flat. The upper end surface of the inner mold side formwork is connected with the corresponding lower end surface of the inner mold top formwork through bolts. The inner mold side The lower end face of the formwork is supported on the corresponding upper end face of the box girder bottom plate concrete.

As a further description of the above technical solution: the bottom formwork, inner formwork, side lower formwork, side upper formwork and side wing formwork are all made of alloy aluminum materials. Each formwork consists of a frame-shaped support rib plate and a frame-shaped support rib plate located at the front end of the support rib plate. It is composed of surface panels. The outer side of each panel in contact with the concrete is provided with a plastic layer. The support ribs around the inner formwork are provided with butt bolt holes at intervals.

As a further description of the above technical solution: the boom is a steel boom, the upper end of the boom is provided with a boom handle for rotating the boom, and the lower part of the boom handle is provided with a section of external threads on the upper end peripheral wall of the boom. There is a boom fixing nut on the threaded part of the outer section, and a gasket is set on the boom at the lower end of the boom fixing nut. There is an outer section on the peripheral wall of the boom at the lower end of the boom that is screwed to the lower boom fixing nut. Threaded part.

As a further description of the above technical solution: the top longitudinal beam is composed of two I-beams arranged side by side to form a double I-beam structure, and the two I-beams are welded together or connected by connecting plates.

As a further description of the above technical solution: the front lower end surface of each top longitudinal beam located at the front edge of the formed box girder is provided with a movable height-adjusting support, and the rear lower end surface of each top longitudinal beam at the rear end of the movable height-adjusting support is also provided. There are movable height-adjusting supports, and a synthetic plastic sliding layer is provided on the lower end of each movable height-adjusting support;

The ratio of the length of each top longitudinal beam to the length of the suspension portion of the top longitudinal beam located at the front end of the mobile height-adjusting support is at least 3:1;

As a further description of the above technical solution: a number of counterweight blocks are connected in series to bear pressure on the rear upper end of each top longitudinal beam. Each counterweight block is in the shape of a gate, and a synthetic plastic sliding layer is provided on the lower end surface of each counterweight block.

As a further description of the above technical solution: the construction of the side-span closing section and the mid-span closing section is:

(1) If the length of the joint surface of the Helong section is equal to the longitudinal length of the two suspension supports, then: on the two adjacent formed box girders at the joint surface of the Helong section, a translation frame system of two cast-in-place box girders with a formwork system will be installed respectively. The upper end longitudinal beams of the two suspension support frames are connected through connecting beams or snap-on plates, and at the same time, the corresponding hanger longitudinal beams and stretch beams on the two suspension support frames are connected through the connecting beams or snap-on plates to form a connection between the joint surfaces of the closing section. Suspension support frame;

(2) If the length of the joint surface of the Helong section is equal to the longitudinal length of a suspension support frame, then: on one side of the joint surface of the Helong section, a cast-in-place box girder translation frame system is set up on the formed box beam, and the upper end of the suspension support frame is supported vertically The beam is erected on the upper end surface of the formed box beam on the other side through connecting beams or clamping plates, forming an overlapping suspension support frame at the joint surface of the closing section.

The invention has the following beneficial effects:

1. The present invention replaces the traditional hanging basket for the hanging construction of cast-in-place box beams, eliminating the traditional cantilever hanging basket construction and eliminating the shortcomings of hanging basket construction. During the suspension casting construction of the cast-in-place box girder, the translation formwork system of the cast-in-situ box girder (or the translation frame of the cast-in-situ box girder with formwork) is used as an overall moving system for the components and formwork of the cast-in-situ box girder. When the next box girder to be cast is suspended and poured, the translation formwork system of the cast-in-place box girder will move as a whole to the construction space of the next box girder to be cast. The invention eliminates the time-consuming and low efficiency of the traditional hanging basket moving forward, and the need to repeatedly anchor the hanging basket and longitudinally move the track. After the hanging basket is moved in place, it is necessary to repeatedly re-arrange the pouring box on the top of the diamond-shaped bracket of the hanging basket. The suspended hanging basket formwork system of the beam body requires repeated disassembly and installation as the hanging basket moves forward, which is labor-intensive and labor-intensive. Moreover, the hanging basket has too many anchor points, which can easily cause damage to the overall structure of the bridge deck. During the walking process, at least several dozen people are required to carry out the work. Cooperate. The track laying process requires the guidance of surveyors, which is cumbersome, complex, time-consuming and labor-intensive. At the same time, there is a risk of derailment and rail sliding during the forward movement.

2. The translational formwork system of the cast-in-place box girder of the present invention has the advantages of fast overall layout speed of each component and formwork of the cast-in-place box girder, fast movement into the construction space of the next box girder to be cast, and less damage to the overall structure of the bridge deck. , the advantages of simple process, saving time and effort.

The layout and displacement of the present invention can be completed only with a forklift or bulldozer, a crane, and 3 to 5 people. It omits the traditional forward movement of the hanging basket, which is time-consuming and inefficient, and requires repeated anchoring of the hanging basket and longitudinal movement of the track. Excessive anchoring can easily cause damage to the overall structure of the bridge deck, and at least several dozen people are required to cooperate during the walking process. , the track laying process requires the guidance of surveyors, which is a cumbersome, complex, time-consuming and labor-intensive process. At the same time, there is a risk of derailment and rail sliding during the forward movement, and the hanging basket formwork of the box beam to be cast needs to be repeatedly re-arranged. Practice has proved that compared with traditional hanging baskets, this invention shortens the displacement time by 50%, reduces the cost by 40%, reduces the number of personnel by more than 60%, and the layout displacement is stable and safe, and has good economic benefits.

3. Since the present invention can adjust the distance between each formwork telescopic screw, oblique telescopic screw and limit sliding rod in each ball head seat and the corresponding screw hole seat or sliding rod seat, the foldable side formwork and the side wing formwork can be suspended. The set position on the frame body, therefore the present invention can not only be conveniently suitable for the cast-in-place construction of cast-in-place box beams with different cross-section sizes, but also suitable for the cast-in-situ construction of cast-in-situ box beams with variable cross-section sizes on the same bridge body, and has better The effect of use.

4. The present invention can set the width of the translation frame system of the box beam to be poured according to the width of the box beam to be poured, and is not limited by the width of the box beam to be poured, nor is it limited by the width of the traditional hanging basket. Since the translational formwork system can be set according to the weight of the box beam to be cast, the load-bearing capacity of the present invention is much greater than that of a traditional hanging basket and the length and width indicators of the box beam to be cast, and the construction period can be shortened by 35 to 40% and the construction cost can be reduced. 35~40%, saving labor and effort and improving construction efficiency.

Description of the drawings

Figure 1 is a schematic structural diagram of the translation rack system of the present invention;

Figure 2 is a schematic diagram of the longitudinal structure of Figure 1 in use;

Figure 3 is a schematic diagram of the transverse side structure of the present invention in use;

Figure 4 is a schematic structural diagram of the roof longitudinal beam of the present invention;

Figure 5 is a schematic structural diagram of the template layout when the present invention is in use;

Figure 6 is a schematic structural representation of the foldable side template of the present invention;

Figure 7 is a schematic structural representation of the inner template of the present invention;

Figure 8 is a schematic diagram of the suspension rod structure of the present invention;

Figure 9 is a structural representation of the mid-span closure section during construction of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following is combined with the specific details. Examples further illustrate the present invention, but the following examples are only preferred embodiments of the present invention and are not exhaustive. Based on the examples in the implementation mode, other embodiments obtained by those skilled in the art without any creative work shall all fall within the protection scope of the present invention. The construction methods in the following examples are conventional methods unless otherwise specified. The materials, devices, equipment, etc. used in the following examples can all be obtained from commercial sources unless otherwise specified.

Embodiment 1: As shown in Figures 1 to 9, a cast-in-place box girder translation formwork system is composed of a cast-in-place box girder translation frame system and a formwork system on it:

As shown in Figures 1 to 5, the cast-in-place box girder translation rack system mainly consists of several top longitudinal beams 3, top cross beams 2, top inclined reinforcement plates 35, hanger beams 5, hanger longitudinal beams 6, and hanger cross beams 7 , 21 supporting beams, 8 suspenders and 14 anchor rods. The middle and rear parts of several roof longitudinal beams 3 distributed at intervals are located on the top surface of the formed box beam 11. The front part of the roof longitudinal beam 3 is located at the upper end of the space of the box beam 10 to be poured, and is exposed to the box to be poured. The lower end of the front part of each top longitudinal beam in the beam space is provided with a suspension frame surrounding the box beam to be poured. The upper parts of the front and rear ends of each roof longitudinal beam are connected together with the front roof beam 20 and the rear roof beam 16 respectively. The rear roof beam 16 is used to facilitate anchoring the rear end of each roof longitudinal beam, and the front roof beam 20 is used to facilitate the penetration of the suspender. Or the two ends of the extension are connected to the suspension beam 5. A number of roof beams 2 are arranged at intervals on the upper part of each roof longitudinal beam between the front and rear roof beams, so that each roof longitudinal beam forms a supporting body.

The suspension frame body is: the suspension frame body is located at the front lower end of each top longitudinal beam. The top longitudinal beams 3 on both sides of the front part or the front top cross beams 20 or top cross beams 2 on both sides of the front part are respectively connected with at least four The upper ends of the hanging beams 5 are fixed as one body, that is, there are at least two hanging beams on each side; oblique reinforcing plates 35 are provided between the angles of each hanging beam and the butt beams to increase the strength of the butt joints. The lower ends of each hanging beam 5 hang down on both sides of the lower end of the box beam 10 to be poured. The hanging beams are located outside both sides of the box beam space to be poured. The lower ends of the hanging beams 5 on both sides are respectively fixed to the two sides of the hanger longitudinal beam 6. At the end, each hanger longitudinal beam and the roof longitudinal beam 3 on the corresponding side or the front roof beam 20 or the roof beam 2 are provided with a number of diagonally distributed reinforced hanger inclined columns 19 on both sides. Strengthen the carrying capacity of the hanging beam. There are at least two hanger beams 7 distributed at intervals between the front and rear of the hanger longitudinal beams 6 on both sides. A number of support beams 21 are provided at intervals between the upper parts of each hanger beam 7. Each support beam is The angle with the hanger beam is a right angle. The front and rear ends of several pole beams 21 or the hanger beams 7 supported by the front and rear ends and the lower ends of the pole beams 21 and corresponding templates are provided with hanger perforations 1, and top longitudinal beams 3 corresponding to the vertical upper ends of each hanger perforations 1 Or the front roof beam 20 or the roof beam 2 is also provided with a hanger hole 1. Several booms 8 are used to vertically pass through the boom perforations on the corresponding structure from top to bottom, and the threaded portion 81 at the lower end of the boom is screwed to the lower boom fixing nut 91 fixed on the lower bottom surface structure of the boom perforation. And the threaded part at the upper end of the boom fixes the front and rear ends of several pole beams or the hanger beams supported by the front and rear ends and lower ends of the pole beams to the top longitudinal beam or the front roof beam through the gasket 13 and the boom tension nut 9 Or at the lower end of the top beam, the suspension frame body forms a suspension support frame that supports the formwork system of the box beam to be poured and can slide or be fixed synchronously with the top longitudinal beam.

The top longitudinal beam 3 is composed of two I-beams arranged side by side to form a double I-beam structure. The two I-beams are welded together or fixedly connected through the connecting plate 31.

In order to increase the working space of the upper end face of the cast-in-place box beam, a mobile height-adjusting support 4 is provided on the front lower end face of each top longitudinal beam located at the front edge of the formed box beam. The mobile height-adjusting support can be a compression-resistant reinforced concrete. block or cast iron block, the height of which is less than 1m. The area of the upper end of the movable height-adjusting support is larger than the area of the top longitudinal beam of the upper end support part. The rear lower end surface of each top longitudinal beam at the rear end of the movable height-adjusting support is also provided with a movable height-adjusting support. High supports to keep each top longitudinal beam horizontal. The lower end surface of each movable height-adjusting support is provided with a synthetic plastic sliding layer 41, such as PVC, PC, etc. with a thickness of 3 to 7 mm, to facilitate the sliding of each top longitudinal beam on the top surface of the formed box beam 11.

That is: one movable height-adjusting support at the lower part of the front end of each top longitudinal beam is located on the top surface of the front end of the completed box girder, and the other mobile height-adjusting support is located on the top surface of the completed box beam at the lower part of the rear end of the same top longitudinal beam. The middle and rear lower end of the longitudinal beam is located on the front and rear movable height-adjusting supports. The top longitudinal beam at the front end of each movable height-adjusting support extends to the space of the next adjacent segment to be cast, and the end head extends to the segment space to be cast. Outside the segment space, the rear part of each top longitudinal beam is anchored to the top surface of the formed box beam by anchor rods passing through the reserved anchor holes in the corresponding parts and using anchor pads and anchor fastening nuts. The upper parts of the front and rear ends are respectively fixed with front and rear roof beams through bolts or welding. Several roof beams are fixed at intervals on the upper parts of each roof longitudinal beam between the front and rear roof beams. A counterweight block 18 is provided.

The length ratio of each top longitudinal beam to the length of the top longitudinal beam suspension portion at the front end of the mobile height-adjusting support must be at least 3:1, so that the front and rear force of each top longitudinal beam meets the design requirements.

A number of counterweight blocks 18 are connected in series to bear pressure on the rear upper end of each top longitudinal beam. Each counterweight block is gate-shaped and made of cast iron. Each block weighs about 500 kg to 1000 kg. There are The synthetic plastic sliding layer 41, such as PC or PVC with a thickness of 3 to 7 mm, is used to facilitate sliding of each top longitudinal beam on the top surface of the formed box beam 11.

As shown in FIGS. 5 and 6 , the foldable side template 27 is composed of three horizontally connected lower side templates 271 , upper side templates 272 and side wing templates 273 . The lower end edge of the side lower template is located on the corresponding edge of the bottom template 23 , and the upper end edge of the side lower template 271 and the lower end edge of the side upper template 272 are hinged through the hinge 38 . The upper end edge of the side upper formwork 272 and the lower end edge of the side wing formwork 273 are also hinged. A number of ball head seats 43 are arranged transversely at intervals on the rear end of the side lower formwork at the lower end of the hinge 38, and laterally on both sides of the suspension frame. A plurality of screw hole seats 40 corresponding to each ball head seat are provided on the corresponding suspension beam 5 or the reinforced hanger inclined column through a shaft 39. The ball heads 44 located at one end of each formwork telescopic screw 26 are respectively provided on the corresponding parts. In the ball head seat 43, the other end of each template telescopic screw 26 is screwed in the screw hole of the screw hole seat 40 of the corresponding part. A number of ball head seats are arranged at horizontal intervals on the middle part of the rear end face of the side wing formwork 273. The corresponding hanger beams or reinforced hanger inclined columns on both sides of the suspension frame body are provided with each ball head through a shaft. There are several screw hole seats corresponding to the seats. The ball heads located at one end of each oblique telescopic screw rod 48 are respectively arranged in the ball head seats of the corresponding parts. The other ends of each oblique telescopic screw rods 48 are respectively screwed into the screw hole seats of the corresponding parts. inside the screw hole. On the lower part of the rear end face of the side lower formwork 271 and on the upper part of the rear end face of the side upper formwork 272, there are several ball joint seats at intervals laterally, and shafts are passed on the laterally corresponding hanger beams or reinforced hanger inclined columns on both sides of the suspension frame body. The rod axis is provided with several sliding rod seats 42 corresponding to each ball head seat. The ball heads located at one end of each limiting slide rod 37 are respectively arranged in the corresponding ball head seats. The other ends of each limiting sliding rod 37 are respectively It is slidably fitted into the sliding hole of the sliding rod seat of the corresponding part, and the sliding rod seat is provided with a fastening screw 47 communicating with the sliding rod seat hole. Each shaft 39 provided in the direction of the longitudinal bridge enables the screw hole seat or the sliding rod seat to move axially around the longitudinal bridge.

The middle part of each template telescopic screw 26 and oblique telescopic screw 48 is provided with a handle rod 51 to facilitate the rotation of the telescopic screw. A push rod 45 is provided on the middle part of the limit slide rod 37 to facilitate moving the limit slide rod.

When the side lower formwork, side upper formwork and side wing formwork of the folding side formwork are pouring the concrete box beams to be poured, the telescopic screws, oblique telescopic screws and limit sliding rods of each formwork are adjusted between each ball head seat and the corresponding screw hole seat. Or the distance within the sliding rod seat, so that the panels of the lower side formwork and the upper side formwork are in the same plane, and the side wing formwork is in the set position, and then use plastic adhesive tape 46 to seal the hinge joints of the panels to form a seamless plane panel .

As shown in Figure 7, the inner formwork is composed of two L-shaped inner mold side formworks 25 that are adapted to the shape of both sides of the cave wall and an inner mold top formwork 36 that is adapted to the shape of the upper end surface of the cave wall. The inner mold side formwork 25. The upper and lower end faces of the inner mold top formwork 36 are flat. The upper end faces of the inner mold side formwork are connected with the corresponding lower end faces of the inner mold top formwork through bolts. The lower end faces of the inner mold side formwork are supported on the box girder bottom plate concrete 101. on the upper end surface. The bottom formwork, inner formwork, side lower formwork, side upper formwork and side wing formwork are all made of alloy aluminum materials. Each formwork is composed of a frame-shaped support rib 34 and a panel 50 located on the front end of the support rib. Each panel The outer side in contact with concrete is provided with a plastic layer 33, such as PVC, PC, etc., to facilitate demoulding. The support ribs around the inner formwork are provided with butt bolt holes 49 at intervals to facilitate the insertion of butt bolts.

As shown in Figure 8, the boom 8 is a steel boom. The upper end of the boom is provided with a boom handle 82 for rotating the boom. The lower part of the boom handle is provided with an external threaded portion 81 on the upper end peripheral wall of the boom. This section The upper screw of the external thread is provided with a hanger fixing nut 9. The hanger at the lower end of the hanger fixing nut is provided with a gasket 13. The lower end of the hanger is provided with a section on the surrounding wall of the hanger that is screwed to the lower hanger fixing nut 91. external thread.

As shown in Figures 1 to 9, a construction method of a translational formwork system for cast-in-place box beams includes the following steps:

(1) Prepare the rack formwork system in advance. After each A-type cable tower 29 is completed, use the bracketing method to cast-in-situ the No. 0 prestressed concrete box beam located at the position of each main tower, and prestress the concrete box beam in No. 0 block. The reserved anchoring holes 15 distributed at intervals for the anchorage positions of the rear ends of the corresponding top longitudinal beams are pre-embedded in the plane of the stressed concrete box beam, and then the translation frame and the translation frame of the cast-in-place box beam are prepared on the surface of the prestressed concrete box beam in block 0. Install the folding side formwork and bottom formwork in the formwork system on the suspension frame of the frame.

Prepare the boom 8, slings, gaskets, fastening nuts, counterweights, clamps and 24 longitudinal square timbers, 22 horizontal square timbers, front, side, bottom and inner formwork;

(2) Installation of the translation frame of the cast-in-place box girder:

(a) The translation frame system is mainly composed of several roof longitudinal beams 3, roof beams, roof inclined reinforcement plates, hanger beams, hanger longitudinal beams, hanger beams, support beams, hanger rods, and anchor rods. Several of them are spaced apart. The middle and rear parts of the top longitudinal beams distributed at a distance are located on the top surface of the formed box beams. The front part of the top longitudinal beams is exposed at the upper end of the box beam space to be poured, and the front part of the roof longitudinal beams is exposed in front of each top longitudinal beam in the box beam space to be cast. The lower end is equipped with a suspension frame surrounding the box beam to be poured. The upper parts of the front and rear ends of each roof longitudinal beam are connected together with the front and rear roof beams. The upper parts of each roof longitudinal beam between the front and rear roof beams are There are a number of top beams spaced apart from each other.

Correspond to the reserved anchor holes 15 on the top surface of the formed No. 0 block prestressed concrete box beam. Use a forklift to place the top longitudinal beams side by side at intervals. The front part of each top longitudinal beam is exposed outside the box beam to be cast. At the upper end of the space, the front lower end of each top longitudinal beam protruding out of the space of the box beam to be poured is provided with a suspension frame surrounding the box beam to be poured.

The suspension frame body is composed of top longitudinal beams on both sides of the front part or front top cross beams on both sides of the front part or both sides of the top cross beam are respectively fixed as one with the upper ends of several suspending beams, and the lower ends of each suspending beam are hung downwardly on the to-be-used hanger. On both sides of the lower end of the cast box beam, the suspension beams are located outside both sides of the space of the box beam to be cast. The lower ends of the suspension beams 5 on both sides are respectively fixed to the two ends of the hanger longitudinal beam 6. Each hanger longitudinal beam is connected to the top of the corresponding side. A number of diagonally distributed reinforced hanger inclined columns 19 are provided on both sides of the longitudinal beam or the front roof beam or the roof beam. The front and rear of the hanger longitudinal beams on both sides are respectively provided with spaced apart distances. There are several hanger beams, and there are several support beams at intervals between the upper ends of each hanger beam. The front and rear ends of the several support beams or the front and rear ends of the support beams and the lower ends of the support beams are supported on the hanger beams and the corresponding formwork. There are suspender perforations, and the top longitudinal beam or front roof beam or top beam corresponding to the vertical upper end of each suspender perforation is also provided with suspender perforations 1.

(b) One movable height-adjusting support at the lower front end of each top longitudinal beam is located on the top surface of the front end of the completed box girder, and the other movable height-adjusting support is located on the top surface of the completed box beam 11 at the lower part of the rear end of the same top longitudinal beam, The middle and rear lower end of each top longitudinal beam is located on the two front and rear movable height-adjusting supports 4. The top longitudinal beam at the front end of each movable height-adjusting support extends to the space of the next adjacent segment to be poured, and the end head extends to Outside the space of the segment to be poured. The rear part of each top longitudinal beam passes through the reserved anchor hole 15 of the corresponding part through the anchor rod 14 and is anchored to the top surface of the formed box beam using the anchor rod pad 13, the anchor rod fastening nut 17 and the anchor bottom fixing nut 12. . The upper parts of the front and rear ends of each roof longitudinal beam are respectively fixed with front and rear roof beams through bolts or welding, and a number of roof beams are fixed at intervals between the front and rear roof beams. A counterweight 18 is provided on the rear portion of the beam.

(3) Installation of the formwork system on the suspension frame, including the installation of the bottom formwork 23, the folding side formwork 27 and the inner formwork:

(a) Installation of the bottom formwork 23: On the upper end of several longitudinal beams 21 of the suspension support frame, transverse square timbers 22, longitudinal square timbers 24, and bottom formwork 23 are arranged from bottom to top. The two ends of the beam are construction anchor channels. There are connecting straps between each beam of the construction anchor channel and the corresponding top longitudinal beam or front roof beam or top beam at the upper end. A safety net is installed outside the construction anchor channel to ensure the safety of personnel.

(b) Installation of the folding side formwork: The lower end surfaces of the two folding side formworks 27 are respectively supported on the upper ends of both sides of the corresponding bottom formwork 23. The folding side formwork is composed of three side lower formworks 271, 271, It is composed of upper side template 272 and side wing template 273. Several ball head seats are provided at intervals on the rear end faces of the side lower formwork, the side upper formwork and the side wing formwork. The corresponding hanger beams and reinforced hanger inclined columns on both sides of the suspension frame are equipped with foldable side formwork. Several screw hole seats 40 and sliding rod seats 42 corresponding to the ball head seats on the rear end surface are respectively installed with folding side formwork on the inside of the hanger beams on both sides and the inclined columns of the reinforced hanger. They are located on the formwork telescopic screws, oblique telescopic screws, and limit The ball head at one end of the sliding rod is respectively axially installed in the ball head seat of the corresponding part. The other ends of the template telescopic screw, the oblique telescopic screw, and the limit sliding rod are respectively screwed or slidably connected to the corresponding screw hole seat and sliding rod seat. Inside, the sliding rod seat is provided with a fastening screw connected to the sliding rod seat hole, and the middle part of each template telescopic screw, oblique telescopic screw, and limit sliding rod is provided with a handle rod or push rod.

(c) Installation of the inner formwork: The installation of the inner formwork is carried out after the concrete pouring of the box girder bottom plate is completed. The inner formwork is composed of the inner formwork 25 and the inner top formwork 36. The upper edge of the inner formwork corresponds to the two sides of the inner top formwork. Through screw connection with connecting bolts, the lower end face of the inner formwork side formwork is held against the corresponding upper end face of the box beam bottom plate concrete, and a telescopic ejector rod 53 is provided between the two inner formwork forms in the same cave.

(4) Use several suspenders 8 to vertically pass through the corresponding structures (i.e., the top longitudinal beam or the front top beam or top beam, the inner top formwork, the bottom formwork, the front and rear ends of the support beam or the support beam) from top to bottom. The suspender hole 1 on the hanger beam (supported by the front and rear ends and the lower end) and the threaded part of the lower end of the hanger are fixed to the bottom surface structure of the hanger hole (the front and rear ends of the arm beam or the front and rear ends and the lower end of the arm beam) The lower hanger fixing nut 91 on the supported hanger beam) is screwed, and the threaded part of the upper end of the hanger connects the front and rear ends of several pole beams or the front and rear ends of the pole beam through the gasket and the boom tension nut 9 The hanger beam supported by the lower end is fixed at the lower end of the top longitudinal beam or the front roof beam or the top beam. The suspension frame body forms a suspension support frame that supports the formwork system of the box beam to be poured and can slide or be fixed synchronously with the top longitudinal beam.

(5) Concrete pouring on suspended support frame:

(a) Place sandbags on the bottom formwork for a pressure test. After the pressure test, install the end formwork, bottom plate steel bars, side formwork steel bars, longitudinal corrugated pipes, reserved anchor holes, install vertical prestressed bars, and then proceed to the box The beam bottom plate is poured with concrete, and the concrete is pumped into the mold. The concrete discharge height is within 1m. It is poured in layers on both sides first and then in the middle.

(b) Then lay out the inner formwork on the box girder floor concrete 101, carry out folding side formwork, installation of wing panels, layout of the front sealing plate 32, layout of steel bars in each formwork, layout of the cable fasteners 28 and the installation of the cable fasteners 28. Fix the corresponding steel bars, install the longitudinal and transverse corrugated pipes, set the reserved anchor holes, set the boom tube or the anti-adhesion layer on the outside of the boom, check and accept, and then pour the box girder web concrete and unload the concrete. The drop height should be within 1m, and the layered pouring height should be within 30cm. The concrete pouring of the box girder roof and wing panels should be carried out from the front end to the rear end, from the middle of the roof panel to both sides, and finally the wing panels of this section are poured.

(6) Remove the cast concrete and end formwork and chisel the end concrete.

(7) Demolding of each template:

Demolding of the foldable side formwork: First, use the handle rod 51 to turn the oblique telescopic screw 48 to shorten the distance between the ball head seat on the side wing formwork and the corresponding screw hole seat or slide rod seat, so that the side wing formwork moves toward the corresponding rear suspension frame. The hanging beams or reinforced hanger inclined columns on both sides of the body are close together to complete the demoulding of the side formwork and the upper end of the side wall of the poured box beam concrete; then, loosen the upper and lower rear end hanging beams or reinforced hanger inclined columns of the side upper and lower formwork. The fastening screw 47 on the column corresponding to the sliding rod seat hole makes the limit sliding rod in the sliding rod seat hole in a loose state. Use the handle rod to turn the telescopic screw of each formwork to shorten the ball head seat and the lower formwork on the side. The distance in the corresponding screw hole seat or sliding rod seat makes the upper and lower formwork on the side move closer to the hanging beams or the inclined columns of the reinforced hanger on both sides of the corresponding rear suspension frame body, and the upper and lower formwork on the side and the pouring are completed. Demolding of the upper and lower ends of concrete side walls of box beams.

Demolding of the inner formwork: Remove each telescopic ejector rod 53 held between the two inner formworks, remove the connecting bolts connecting the upper edge of the inner formwork and the corresponding sides of the inner top formwork, and complete the inner formwork and the inner formwork. The demoulding of the top formwork; the inner formwork is still located in the inner working hole of the poured concrete after being separated from the inner working hole wall of the poured concrete for a certain distance to facilitate transfer to the next adjacent construction working hole.

(8) Complete the longitudinal, transverse, and vertical prestressed tendon tensioning and grouting in the tensioning holes; or for blocks with lanyards, the layout and traction of the left and right stay cables 30, that is, for blocks with lanyards, Then correspond to the layout of the left and right stay cables 30 and the traction and tightening of the hanging cables at the top of the bridge tower column 29.

(9) Forward movement of the cast-in-place box girder translation frame system with formwork system: Rotate the boom handle 82 at the upper end of each boom to drive each boom to rotate, so that the external thread at the lower end of the boom is in contact with the bottom fixed on the corresponding structure. Disengage the suspender fixing nut 91 from the screw connection, and remove each suspender from each top longitudinal beam or front connecting beam; Loosen and remove the anchor rods, and increase the number of counterweights located at the rear of each top longitudinal beam, so that the front and rear ends of each top longitudinal beam and the suspension support frame are not fixed to the corresponding cast box beams. At the connection point, a forklift or bulldozer is used to push the rear end of each top longitudinal beam, and the translation frame system of the cast-in-place box beam with the formwork system is slowly and longitudinally translated forward, so that the front part of each top longitudinal beam is exposed to the next box to be cast. At the upper end of the beam space, the suspension frame body with the formwork system is moved to the space of the next box beam to be cast and surrounded by the outer space around the next box beam to be cast.

(10) Repeat steps (4) to (9) to continue the construction of the next box beam to be cast and the forward movement of the cast-in-place box beam translation frame system with the formwork system;

(11) Construction of side-span Helong section and mid-span Helong section.

The construction of the side span Helong section and the mid-span Helong section is:

(1) If the length of the joint surface of the Helong section is equal to the longitudinal length of the two suspension supports, then: on the two adjacent formed box girders at the joint surface of the Helong section, a translation frame system of two cast-in-place box girders with a formwork system will be installed respectively. The upper end longitudinal beams of the two suspension support frames are connected through connecting beams or clamping plates 52, and at the same time, the corresponding hanger longitudinal beams and stretch beams on the two suspension supporting frames are connected through the connecting beams or clamping plates to form a connection between the joint surfaces of the closing sections. Close the suspension support frame; repeat steps (4) to (9) to complete the construction of the side span closure section and the mid-span closure section.

(2) If the length of the joint surface of the Helong section is equal to the longitudinal length of a suspension support frame, then: on one side of the joint surface of the Helong section, a cast-in-place box girder translation frame system is set up on the formed box beam, and the upper end of the suspension support frame is supported vertically The beam is erected on the upper end surface of the formed box beam on the other side through connecting beams or clamping plates, forming an overlapping suspension support frame at the joint surface of the closing section. Repeat steps (4) to (9) to complete the construction of the side span closure section and the mid-span closure section.

If the length of the joint surface of the closure section is slightly larger than the longitudinal length of a suspension support frame, the joints that are larger than the space can be closed with traditional overlapping brackets and templates, so they will not be described again.

Embodiment 2: The difference from Embodiment 1 is that the present invention can adjust the distance between each template telescopic screw, the oblique telescopic screw and the limiting sliding rod in each ball head seat and the corresponding screw hole seat or sliding rod seat. The foldable side formwork and the side wing formwork are in set positions on the suspension frame, so the present invention can not only facilitate the cast-in-place construction of cast-in-place box girders with different cross-section sizes, but is also suitable for variable cross-sections of cast-in-place box girders on the same bridge body. The cast-in-place construction of the size has better use effect. The rest are the same as those in Embodiment 1, so they will not be described again.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can, within the technical scope disclosed in the present invention, use the technology of the present invention. Any equivalent substitution or change of the scheme and its inventive concept shall be covered by the protection scope of the present invention.

Claims (10)

1. The translational formwork system of the cast-in-situ box girder and the construction method thereof are characterized in that the construction method comprises the following steps:

(1) After each A-type cable tower is built, a No. 0 prestressed concrete box girder positioned at each main tower position is firstly cast-in-situ by adopting a building bracket method, reserved anchoring holes which are distributed at intervals and correspond to the anchoring positions of the rear ends of the top longitudinal girders are pre-embedded in the No. 0 prestressed concrete box girder surface, then a translation frame of the cast-in-situ box girder is prepared on the No. 0 prestressed concrete box girder surface, and a folding side template and a bottom template in the template system are arranged on a suspension frame body of the translation frame;

preparing a suspender, a gasket, a fastening nut, a balancing weight, a clamp, a longitudinal square timber, a transverse square timber, a front, a side, a bottom and an inner template;

(2) And (3) mounting a translation frame of the cast-in-situ box girder:

(a) The translation frame system mainly comprises a plurality of top longitudinal beams, top cross beams, top oblique reinforcing plates, hanging beams, hanging frame longitudinal beams, hanging frame cross beams, supporting beams, hanging rods and anchor rods, wherein the middle and rear parts of the top longitudinal beams distributed at intervals are positioned on the top surface of the formed box beam, the front parts of the top longitudinal beams are externally detected at the upper end of a box beam space to be poured, suspension frame bodies which are externally detected at the front lower ends of the top longitudinal beams in the box beam space to be poured and are enclosed outside the periphery of the box beam to be poured are arranged at the front lower ends of the top longitudinal beams, the upper parts of the front and rear ends of the top longitudinal beams are respectively connected into a whole by front and rear top cross beams, and the upper parts of the top longitudinal beams between the front and rear top cross beams are provided with a plurality of top cross beams at intervals;

The top surface of the formed 0 # block prestressed concrete box girder is correspondingly provided with each reserved anchor hole, each top girder is placed side by using a forklift at intervals, the front part of each top girder is externally detected at the upper end of the box girder space to be poured, and the front lower end of each top girder externally detected in the box girder space to be poured is provided with a hanging frame body which surrounds the periphery of the box girder to be poured;

the hanging frame body is a top longitudinal beam at two sides of the front part or a front top cross beam at two sides of the front part or two sides of the top cross beam are respectively fixed with the upper ends of a plurality of hanging beams into a whole, the lower ends of the hanging beams are downwards and vertically arranged at two sides of the lower end of a box beam to be poured, the hanging beams are positioned outside two sides of the box beam space to be poured, the lower ends of the hanging beams at two sides are respectively fixedly connected with two ends of the hanging frame longitudinal beams, a plurality of obliquely distributed reinforced hanging frame diagonal columns are arranged at two sides of the front top cross beam or the front top cross beam at the corresponding side or the front top cross beam, a plurality of hanging frame cross beams are respectively arranged between the front part and the rear part of the hanging frame longitudinal beams at intervals, a plurality of supporting beams are respectively arranged at intervals between the front end and the rear end of the hanging frame cross beams or the front end and the rear end of the hanging frame cross beams and the lower end of the hanging frame cross beams, and a hanging frame perforation is arranged on a corresponding template, and a hanging frame perforation is also arranged on the top longitudinal beam or the front top cross beam corresponding to the hanging beam;

(b) One movable height-adjusting support at the lower part of the front end of each top girder is positioned on the top surface of the front end of the finished box girder, the other movable height-adjusting support is positioned on the top surface of the finished box girder at the lower part of the rear end of the same top girder, the lower middle and rear ends of each top girder are positioned on the front and rear movable height-adjusting supports, the top girders at the front end of each movable height-adjusting support extend into the space of the next adjacent section to be poured, the end heads extend out of the space of the section to be poured, the rear part of each top girder passes through a reserved anchoring hole of the corresponding part through an anchor rod and is anchored on the top surface of the formed box girder by using an anchor rod backing plate and an anchor rod fastening nut, the upper parts of the front and rear ends of each top girder are respectively fixed with a front top girder and a rear top girder through bolts or welding, the upper parts of each top girder between the front and the rear top girders are fixed with a plurality of top girders at intervals, and the rear parts of each top girder are provided with balancing weights;

(3) Template system installation on the mounted frame body, including the installation of bottom form board, folding side form board and interior template:

(a) And (3) mounting a bottom template: the upper end surfaces of a plurality of longitudinally arranged stretcher beams of the suspension support frame are sequentially provided with a transverse square timber, a longitudinal square timber and a bottom template from bottom to top, the front ends of the stretcher beams and the two ends of a hanger longitudinal beam are construction anchor channels, and connecting hanging strips are arranged between each beam of the construction anchor channels and a top longitudinal beam or a front top cross beam or a top cross beam corresponding to the upper end;

(b) Mounting of a folding side template: the lower end surfaces of the two folding side templates are respectively propped against the upper ends of two side edges of the bottom template of the corresponding part, the folding side templates consist of three side lower templates, side upper templates and side wing templates which are transversely connected in a shaft way, a plurality of ball seat are arranged on the rear end surfaces of the side lower templates, the side upper templates and the side wing templates at intervals, a plurality of screw hole seats and slide rod seats which correspond to the ball seat on the rear end surfaces of the folding side templates are axially arranged on the hanging beams and the reinforcing hanging frame diagonal columns which correspond to the two sides of the hanging frame body, the folding side templates are respectively arranged on the inner sides of the hanging beams and the reinforcing hanging frame diagonal columns, the ball heads positioned at one ends of the template telescopic screw rods, the diagonal telescopic screw rods and the limiting slide rods are respectively arranged in the ball seat of the corresponding part in a shaft way, the other ends of the template telescopic screw rods, the diagonal telescopic screw rods and the limiting slide rods are respectively screwed or slidingly matched in the corresponding screw hole seats and slide rod seats, and the fastening screw rods which are communicated with the holes of the slide rod seats are arranged on the slide rod seats;

(c) And (3) mounting an inner template: the inner template is installed after the concrete of the bottom plate of the box girder is poured, the inner template consists of an inner template and an inner top template, the upper end edge of the inner template is in threaded connection with the corresponding edges of the two sides of the inner top template through connecting bolts, the lower end face of the inner template is propped against the corresponding upper end face of the concrete of the bottom plate of the box girder, and a telescopic ejector rod is arranged between the two inner templates in the same cavity;

(4) The hanging frame body forms a hanging support frame which supports a box girder template system to be poured and can synchronously slide or be fixed with the top girder;

(5) Concrete pouring on the suspension support frame:

(a) The method comprises the steps of testing pressure on a bottom template, installing an end template, installing a bottom plate reinforcing steel bar, arranging side wing template reinforcing steel bars, arranging a longitudinal corrugated pipe and reserving anchor holes after testing the pressure, installing a vertical prestressed reinforcement, then pouring concrete on a bottom plate of a box girder, pumping concrete into the mould, pouring concrete in layers at the two sides and then the middle after unloading the concrete to a height within 1 m;

(b) Then, arranging an inner template on the concrete of the bottom plate of the box girder, arranging a folding side template, a front sealing plate, arranging reinforcing steel bars in each template, arranging a guy cable fixedly connecting piece, fixing the guy cable fixedly connecting piece with the reinforcing steel bars of the corresponding part, installing longitudinal and transverse corrugated pipes, arranging a reserved anchor hole, arranging a hanging rod cylinder or arranging an anti-adhesive layer outside a hanging rod, checking and accepting, then, pouring concrete of the web plate of the box girder, wherein the concrete drop height is within 1m, the layered pouring height is within 30cm, pouring concrete of the top plate of the box girder and wing plates from the front end to the rear end, and finally pouring the wing plates of the section;

(6) Curing the poured concrete, removing the end template and roughening the end concrete;

(7) Demolding each template: a plurality of telescopic ejector rods which are propped between the two inner side templates are removed,

demolding of the folding side template: firstly, rotating an oblique telescopic screw rod through a handle rod to shorten the distance between a ball seat on a side wing template and a corresponding screw hole seat or a sliding rod seat, so that the side wing template approaches to a hanging beam or a reinforcing hanging frame oblique column on two sides of a hanging frame body on the corresponding rear side, and demoulding the side wing template and the upper end of the side wall of the poured box girder concrete is completed; then, loosening fastening screws corresponding to slide bar seat holes on hanging beams or reinforcing hanging frame inclined columns at the rear ends of the upper and lower templates at the sides, enabling limit slide bars in the slide bar seat holes to be in a loosening state, rotating telescopic screws of the templates through handle rods, shortening the distances between ball seats on the upper and lower templates at the sides and corresponding screw hole seats or in the slide bar seats, enabling the upper and lower templates at the sides to approach to hanging beams or reinforcing hanging frame inclined columns at the two sides of a hanging frame body at the corresponding rear sides, and completing demoulding of the upper and lower templates at the sides and the upper and lower ends of the side walls of poured box girder concrete;

demolding of the inner template: disassembling each telescopic ejector rod propped between the two inner side templates, disassembling connecting bolts of the upper end edges of the inner side templates and the corresponding edges of the two sides of the inner top templates, and completing demolding of the inner side templates and the inner top templates; the inner template is separated from the inner operation hole wall of the poured concrete by a distance and then is still positioned in the inner operation hole of the poured concrete;

(8) Tensioning longitudinal, transverse and vertical prestressed tendons and grouting in tensioning holes; or the left and right stay ropes are correspondingly arranged and pulled for the registration blocks;

(9) Forward movement of a cast-in-situ box girder translational frame system with a template system: rotating a boom handle at the upper end of each boom to drive each boom to rotate, so that an external thread part at the lower end of each boom is in screw connection with a lower boom fixing nut fixed on a corresponding structure, and each boom is taken down upwards from each top longitudinal beam or front connecting cross beam; loosening and removing each hanging strip and each anchoring anchor rod which are connected with the cast box girder on each top longitudinal beam or the front connecting cross beam, increasing the number of balancing weights arranged on the rear part of each top longitudinal beam, enabling the front end and the rear end of each top longitudinal beam and the cast box girder of the hanging support frame and the corresponding part to have no fixed connection part, respectively pushing the front end and the rear end of each top longitudinal beam by using a forklift or a bulldozer, and slowly and synchronously translating a translation frame system of a cast-in-place box girder of a template system forwards, so that the front part of each top longitudinal beam is externally detected at the upper end of a next box girder space to be cast, and a suspension frame body with the template system is moved into the next box girder space to be cast and surrounds the outer space around the next box girder to be cast;

(10) Repeating the steps (4) to (9), and continuing the construction of the next box girder to be poured and the forward movement of the cast-in-situ box girder translation frame system with the template system;

(11) And (5) constructing side span closure sections and middle span closure sections.

2. The method of claim 1, wherein: the folding side template is: the folding side template consists of three side lower templates, side upper templates and side wing templates which are transversely and axially connected, wherein the lower end edge of the side lower templates is positioned on the corresponding edge of the bottom template, the upper end edge of the side lower templates is hinged with the lower end edge of the side upper templates through hinges, the upper end edge of the side upper templates is also hinged with the lower end edge of the side wing templates through hinges, a plurality of ball seat seats are transversely arranged on the rear end surface of the side lower templates at the lower ends of the hinges at intervals, a plurality of screw hole seats corresponding to the ball seat are axially arranged on suspension beams or reinforcing suspension bracket diagonal columns transversely corresponding to the two sides of the suspension bracket body, the ball heads positioned at one end of each template telescopic screw rod are respectively axially arranged in the ball seat of the corresponding part, and the other end parts of each template telescopic screw rod are respectively and spirally arranged in the screw holes of the screw hole seats of the corresponding part;

a plurality of ball seats are transversely arranged in the middle of the rear end surface of the flank template at intervals, a plurality of screw hole seats corresponding to the ball seats are axially arranged on the hanging beam or the reinforcing hanging frame inclined column corresponding to the two sides of the hanging frame obliquely downwards, the ball heads at one end of each oblique telescopic screw rod are respectively axially arranged in the ball seat of the corresponding part, and the other end of each oblique telescopic screw rod is respectively and spirally arranged in the screw hole of the screw hole seat of the corresponding part;

A plurality of ball seat bases are arranged on the lower part of the rear end surface of the side lower template and the upper part of the rear end surface of the side upper template at intervals transversely, a plurality of slide rod seats corresponding to the ball seat bases are arranged on the lifting beams or the reinforcing lifting frame inclined columns transversely corresponding to the two sides of the hanging frame body in a shaft mode, the ball heads at one end of each limiting slide rod are respectively arranged in the ball seat bases of the corresponding parts in a shaft mode, the other end of each limiting slide rod is respectively matched in the slide holes of the slide rod seats of the corresponding parts in a sliding mode, and fastening screw rods communicated with the slide rod seat holes are arranged on the slide rod seats;

the middle parts of the template telescopic screw rod, the oblique telescopic screw rod and the limiting slide rod are provided with a handle rod or a push rod.

3. The method of claim 2, wherein: when the side lower template, the side upper template and the side wing templates of the folding side template are used for pouring a concrete box girder to be poured, the panels of the side lower template and the side upper template are positioned in the same plane, the side wing templates are positioned at set positions, and then the panel hinge joints are sealed by plastic glue to form a seamless plane panel by adjusting the distances between the telescopic screw rods, the oblique telescopic screw rods and the limiting slide rods of the templates in the screw hole seats or the slide rod seats corresponding to the ball seat.

4. The method of claim 1, wherein: the inner template is composed of two inner template side templates which are L-shaped and are matched with the shapes of two sides of the hole wall, and an inner template top template which is matched with the shape of the upper end face of the hole wall, wherein the upper and lower edge end faces of the inner template side templates and the inner template top template are planes, the upper edge end face of the inner template side template is connected with the lower edge end face of the corresponding inner template top template through bolts, and the lower edge end face of the inner template side template is propped against the corresponding upper end face of the box girder bottom plate concrete.

5. The method of claim 1, wherein: the bottom template, the inner template, the side lower template, the side upper template and the side wing templates are all made of alloy aluminum materials, each template is composed of a frame-shaped supporting rib plate and a panel positioned on the front end face of the supporting rib plate, a plastic layer is arranged on the outer side face of each panel, which is in contact with concrete, and butt joint bolt holes are formed in the supporting rib plates on the periphery of the inner template at intervals.

6. The method of claim 1, wherein: the hanger rod is a steel hanger rod, the upper end of the hanger rod is provided with a hanger rod handle for rotating the hanger rod, the peripheral wall of the upper end of the hanger rod at the lower part of the hanger rod handle is provided with a section of external thread part, the section of external thread part is provided with a hanger rod fixing nut in a threaded manner, the hanger rod at the lower end of the hanger rod fixing nut is sleeved with a gasket, and the peripheral wall of the hanger rod at the lower end part of the hanger rod is provided with a section of external thread part in threaded connection with the lower hanger rod fixing nut.

7. The method of claim 1, wherein: the top longitudinal beam is formed by arranging two I30-50I-steel side by side to form a double-spliced I-steel structure, and the two I-steel are welded into a whole or fixedly connected through a connecting plate.

8. The method of claim 1, wherein: a movable height-adjusting support is arranged on the lower front end face of each top longitudinal beam positioned at the front end edge of the formed box beam, a movable height-adjusting support is also arranged on the lower rear end face of each top longitudinal beam positioned at the rear end of the movable height-adjusting support, and a synthetic plastic sliding layer is arranged on the lower end face of each movable height-adjusting support;

The length ratio of the length of each top longitudinal beam to the length of the top longitudinal beam suspending part at the front end of the movable height-adjusting support at the front end is at least 3:1.

9. the method of claim 1, wherein: the plurality of balancing weights are connected in series and bear the upper end of the rear part of each top longitudinal beam, each balancing weight is shaped like a door, and a synthetic plastic sliding layer is arranged on the lower end face of each balancing weight.

10. The method of claim 1, wherein: the construction of the side span closure section and the middle span closure section is as follows:

(1) If the length of the abutting surface of the closure segment is equal to the longitudinal length of the two suspension support frames, the following steps are carried out: two translation frame systems of two cast-in-situ box girders with template systems are respectively arranged on two adjacent formed box girders on the butt joint surface of the closure section, top longitudinal beams at the upper ends of the two suspension support frames are in butt joint through a connecting beam or a clamping plate, and corresponding hanger longitudinal beams and supporting beams on the two suspension support frames are in butt joint through the connecting beam or the clamping plate at the same time, so that a connected suspension support frame of the butt joint surface of the closure section is formed;

(2) If the length of the abutting surface of the closure segment is equal to the longitudinal length of one suspension support frame, the following steps are adopted: a translation frame system of a cast-in-situ box beam is arranged on a formed box beam at one side of a butt joint surface of a closure section, and a top longitudinal beam at the upper end of a suspension support frame is erected on the upper end surface of the formed box beam at the other side through a connecting beam or a clamping plate to form a lap joint suspension support frame of the butt joint surface of the closure section.