CN119824803A - Construction method for curve variable-section bridge tower reinforcement cage block prefabrication - Google Patents
Construction method for curve variable-section bridge tower reinforcement cage block prefabrication Download PDFInfo
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Abstract
本发明公开了一种曲线变截面桥塔钢筋骨架分块预制的施工方法，通过操作系统、钢筋骨架支撑系统和钢筋定位系统共同构成一体化施工平台，在一体化施工平台上提前绑扎钢筋骨架和劲性骨架，并预留散拼段，在地面上通过特定器械对主筋进行预弯曲，精确匹配塔柱的设计曲率，完成塔柱截面的变曲率施工，使用主筋定位胎架与水平筋定位齿板完成钢筋的定位，与劲性骨架绑扎成一个整体，一体吊装，降低施工复杂度，使吊装上去的主筋已经有塔柱的设计曲率，避免了复杂的高空作业操作，提高了施工安全性。
The invention discloses a construction method for prefabricating a steel frame of a curved variable-section bridge tower in blocks. An operating system, a steel frame support system and a steel frame positioning system are used to form an integrated construction platform. The steel frame and the rigid frame are tied in advance on the integrated construction platform, and loose sections are reserved. The main reinforcement is pre-bent on the ground by a specific device to accurately match the design curvature of the tower column to complete the variable curvature construction of the tower column section. The main reinforcement positioning cradle and the horizontal reinforcement positioning tooth plate are used to complete the positioning of the reinforcement, which is tied to the rigid frame into a whole and hoisted as a whole, thereby reducing the complexity of construction. The hoisted main reinforcement already has the design curvature of the tower column, avoiding complex high-altitude operation and improving construction safety.
Description
Technical Field
The invention relates to the technical field of bridge engineering construction, in particular to a construction method for block prefabrication of a curved variable-section bridge tower reinforcement cage.
Background
The cable-stayed bridge is used as a inhaul cable system, has larger spanning capacity than a beam-type bridge, and is a main bridge type of a large-span bridge. The bridge tower is a key bearing structure of a cable-stayed bridge, and is mainly diamond-shaped, A-shaped, inverted Y-shaped, H-shaped and single-column-shaped, and is made of reinforced concrete. Most tower columns are formed by inwards inclining tower limbs at two sides and have a certain inclination angle. Wherein, like the tower column of diamond type, both sides tower limb not only inwards has inclination, and the slope of tower limb inclination is constantly changing still.
At present, the construction of the existing tower column mainly comprises two modes:
(1) And carrying out on-site loose splicing, transporting the required steel bars to the site, and then splicing in sequence.
(2) The net piece is assembled, firstly, steel bars are assembled into net pieces or blocks on the ground, and then the net pieces or blocks are hoisted to a designated position for assembly.
The construction efficiency of the two construction methods is not high enough, and the high-altitude operation has safety risks. Compared with the first split joint method, the second construction method improves the construction efficiency to a certain extent by processing the reinforcing steel bars into the net pieces on the ground in advance, reduces the safety risk, but has limited lifting degree. Especially for the curve variable cross section cable-stayed bridge tower column, the construction operation is carried out in the high altitude, so that not only is the safety risk on operators brought, but also the construction difficulty is high, the line type of the tower column is not easy to control, and the construction quality cannot be guaranteed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a construction method for block prefabrication of a reinforcement cage of a curve variable cross-section bridge tower, which solves the problems of low construction efficiency, high safety risk and difficult control of curve curvature precision of the curve variable cross-section bridge tower.
The aim of the invention is achieved by the following technical scheme:
the construction method for the curve variable-section bridge tower reinforcement cage block prefabrication is characterized by comprising the following steps of:
S1, building an integrated construction platform at a corresponding position according to a construction drawing design, binding in the integrated construction platform, and reserving loose splicing sections, wherein the integrated construction platform comprises an operating system, a reinforcement cage supporting system and a reinforcement positioning system;
s2, after the operation system, the reinforcement cage support system and the reinforcement positioning system are built, installing a cantilever plate in the operation system, wherein the cantilever plate can horizontally move in the operation system, and the cantilever distance of the cantilever plate is controlled through horizontal movement, so that the distance between a binding operation point and the reinforcement cage and the distance between the binding operation point and the reinforcement cage are controlled;
S3, pre-bending the main bars by using an instrument, accurately positioning the main bars by a steel bar positioning system, binding a first layer of vertical main bars and a first layer of horizontal bars on a steel bar framework supporting system, and storing a second layer of horizontal bars on the steel bar positioning system;
S4, binding a second layer of vertical main ribs and a second layer of horizontal ribs;
s5, installing a stiff framework, and connecting the stiff framework and the main rib into a whole;
s6, installing a connecting piece and a main rib positioning toothed plate on the stiff framework;
s7, binding residual steel bars, so that binding manufacture of the first part and the second part is completed;
S8, moving the cantilever plate, moving the extending part of the cantilever plate into the operating system, moving the operating system to enable the operating system to be far away from the first part and the second part to form a hoisting space, and then hoisting the first part and the second part in sequence.
Further, the operating system comprises a binding platform and a platform slideway, wherein the platform slideway is fixed on the ground, and the binding platform is arranged on the platform slideway and can move along the platform slideway.
Further, the ligature platform adopts light-duty skeleton texture, and the ligature platform is equipped with the multilayer, and protection railing is installed in the outside of the top one deck of ligature platform, but the board of encorbelmenting of horizontal migration is all installed to every layer of ligature platform.
Further, each layer of the binding platform is provided with a movable slideway, and the cantilever plate is mounted on the movable slideway through rollers to realize horizontal movement of the cantilever plate.
Further, in step S8, after the first and second parts are bound, the cantilever plate is first moved horizontally into the binding platform, and then the binding platform is moved along the platform slideway, so that the binding platform drives the cantilever plate to be far away from the first and second parts, a hoisting space sufficient for hoisting is formed, a hoisting device is installed in the hoisting space, and the first and second parts are hoisted in sequence through the hoisting device.
In step S2, when the cantilever plate moves horizontally, the length of the cantilever plate extending out of the binding platform is 50-1500 mm.
Further, the steel reinforcement framework supporting system comprises a supporting beam, a telescopic tube and a supporting embedded part, the supporting embedded part is fixed on the ground, the supporting beam is hinged with one supporting embedded part, one end of the telescopic tube is hinged with the other supporting embedded part, the other end of the telescopic tube is hinged with the supporting beam, and the inclination angle of the supporting beam is controlled through telescopic tube expansion.
Further, the steel bar positioning system comprises a bottom main bar positioning jig, a middle main bar positioning jig, a top main bar positioning jig and a horizontal bar positioning toothed plate, wherein the bottom main bar positioning jig is fixed on the ground, the middle main bar positioning jig and the top main bar positioning jig are fixedly arranged on the stiff framework, the horizontal bar positioning toothed plate is arranged on the steel bar framework supporting system and the stiff framework, and the steel bar positioning system can accurately position the positions of the main bars and the horizontal bars.
Further, in step S5, before the stiff skeleton is installed, the horizontal rib positioning toothed plate needs to be taken out first, and then the stiff skeleton is installed.
Further, the steel reinforcement framework and the stiffness framework both comprise standard sections and widened lap sections, and the standard sections and the widened lap sections are connected to form the steel reinforcement framework or the stiffness framework.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, an integrated construction platform is formed by the operation system, the reinforcement cage support system and the reinforcement positioning system, the reinforcement cage and the stiffness framework are bound in advance on the integrated construction platform, the split segments are reserved, the main reinforcement is pre-bent on the ground through specific instruments, the design curvature of the tower column is precisely matched, the variable curvature construction of the section of the tower column is completed, the main reinforcement which is hoisted has the design curvature of the tower column, complex high-altitude operation is avoided, and the construction safety is improved.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of an integrated construction platform according to the present invention;
FIG. 2 is a top view of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic structural view of a main rib positioning toothed plate in the present invention;
fig. 4 is a schematic structural view of a reinforcement cage according to the present invention;
FIG. 5 is a construction flow chart (I) of the present invention;
FIG. 6 is a construction flow chart (II) in the present invention;
FIG. 7 is a construction flow chart (III) in the present invention;
FIG. 8 is a construction flow chart (IV) according to the present invention;
FIG. 9 is a construction flow chart (fifth) in the present invention;
FIG. 10 is a construction flow chart (six) according to the present invention;
FIG. 11 is a construction flow chart (seventh) according to the present invention;
fig. 12 is a construction flow chart (eight) in the present invention.
The steel bar framework is 1-steel bar framework, 2-stiffness framework, 3-standard section, 4-widening overlap section, 5-binding platform, 6-platform slideway, 7-protection railing, 8-cantilever plate, 9-moving slideway, 10-roller, 11-supporting beam, 12-telescopic sleeve, 13-supporting embedded part, 14-bottom main bar positioning jig frame, 15-horizontal bar positioning toothed plate, 16-first layer vertical main bar, 17-first layer horizontal bar, 18-second layer vertical main bar, 19-second layer horizontal bar, 20-connecting piece, 21-main bar positioning toothed plate, 22-lifting device, a-part I and b-part II.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
As shown in figures 1 to 4, the whole bridge tower is arc-shaped, the slope of the reinforcement cage of the bridge tower of the whole section is continuously changed, the reinforcement cage is formed by binding reinforcement bars by the stiff framework in a lap joint mode, the reinforcement cage and the stiff framework comprise four inclined L-shaped standard sections and widened lap joint sections, and the standard sections and the widened lap joint sections are connected in pairs to form the reinforcement cage or the stiff framework. The sections of the four inclined L-shaped standard sections are four corners, in which steel bars are fixedly arranged in the section of the bridge tower, and the four inclined L-shaped standard sections are matched with the widened overlap sections to adapt to prefabrication of the steel bar framework of the full bridge tower.
The invention can flexibly control the splicing of the detail part of the tower column by combining the part with the loose splicing, can control the staggering of the part and the steel anchor beam, and accurately installs the steel anchor by the loose splicing mode.
The integrated construction platform comprises an operating system, a steel reinforcement framework supporting system and a steel reinforcement positioning system, the operation of operators is facilitated through the operating system, steel reinforcement and a stiff framework are bound to form a part, the steel reinforcement is supported through the steel reinforcement framework supporting system, the inclination angle of the steel reinforcement framework supporting system can be adjusted, accordingly, the manufacture of rods with different curvatures is completed, the positions of main reinforcements and horizontal reinforcements of the steel reinforcement framework are accurately positioned through the steel reinforcement positioning system, and joint or joint steel reinforcement framework butt joint errors are reduced.
The operation system comprises a binding platform and a platform slideway, wherein the platform slideway is fixed on the ground, the binding platform is installed on the platform slideway and can move along the platform slideway, the platform slideway can be composed of I-steel, a traction end and finish rolling deformed steel bars, the I-steel is fixed on the ground, the traction end is installed at two ends of the I-steel, the finish rolling deformed steel bars are installed between the two traction ends, the binding platform adopts a light framework structure, the whole binding platform is 5.7m high, the binding platform is provided with multiple layers, four layers are arranged in the embodiment, the outer side of one layer at the top of the binding platform is provided with a protective railing, the binding platform is installed on the platform slideway, the position of the binding platform on the platform slideway is accurately adjusted through the finish rolling deformed steel bar cap and is locked, each layer of the binding platform is provided with a movable slideway, the cantilever plate is installed on the movable slideway through rollers, the cantilever plate is horizontally moved on the movable slideway, the binding platform and the position of the cantilever plate is flexibly controlled according to the construction progress of a main tower, and the construction is convenient.
The steel reinforcement framework supporting system comprises a supporting beam, telescopic sleeves and supporting embedded parts, wherein the supporting embedded parts are fixed on the ground, the two supporting embedded parts are arranged, the supporting beam is hinged with one supporting embedded part, one end of each telescopic sleeve is hinged with the other supporting embedded part, the other end of each telescopic sleeve is hinged with the supporting beam, and the inclination angles of the supporting beams are controlled through the telescopic sleeves, so that installation of different inclination angles is realized.
The invention completes the manufacture of four inclined L-shaped standard sections and widened overlap sections on a reinforcement cage supporting system, uses a hoisting device to hoist a first part and a second part to a designated position, completes the splicing of the four inclined L-shaped standard sections through the loose splicing sections, and the reserved loose splicing sections facilitate the installation of the widened overlap sections, namely the widened overlap sections are positioned in the loose splicing sections after the splicing is completed, so that all the parts are connected into a whole, each layer of parts are cast layer by layer in a mode of lapping, and the upper part and the lower part are connected in a mechanical mode to complete the construction of the curve variable cross section tower column.
The steel bar positioning system comprises a bottom main bar positioning jig, a middle main bar positioning jig, a top main bar positioning jig and a horizontal bar positioning toothed plate, wherein the bottom main bar positioning jig is fixed on the ground, the middle main bar positioning jig and the top main bar positioning jig are fixedly arranged on the stiff framework, the horizontal bar positioning toothed plate is arranged on the steel bar framework supporting system and the stiff framework, and the steel bar positioning system can accurately position the positions of the main bars and the horizontal bars.
In this embodiment, the bottom main reinforcement location bed-jig adopts and arranges a channel-section steel respectively in inside and outside main reinforcement position department, and the channel-section steel passes through pre-buried anchor slab and anchor bar anchor in ground, connects between channel-section steel and the channel-section steel and forms wholly, and the reuse positioning sleeve intercepts 1cm length, welds at the channel-section steel upper surface according to main reinforcement interval, and the cover reinforcing bar sleeve is arranged according to main reinforcement position strictly to guarantee that the reinforcing bar location is accurate and does not take place the displacement.
As shown in fig. 5 to 12, a construction method for prefabricating a curved variable cross-section bridge tower reinforcement cage in a blocking manner comprises the following steps:
s1, building an integrated construction platform at a corresponding position according to a construction drawing design, binding in the integrated construction platform, and reserving loose splicing sections;
S2, after the operation system, the reinforcement cage support system and the reinforcement positioning system are built, installing a cantilever plate in the operation system, wherein the cantilever plate can horizontally move in the operation system, and the cantilever distance of the cantilever plate is controlled through horizontal movement, so that the distances between a binding operation point and the reinforcement cage and between the binding operation point and the reinforcement cage are controlled, the binding operation is convenient for workers, and the length of the cantilever plate extending out of a binding platform is 50-1500 mm when the cantilever plate horizontally moves;
S3, pre-bending the main bars by using an instrument, accurately positioning the main bars by using a positioning jig frame of a steel bar positioning system, binding a first layer of vertical main bars and a first layer of horizontal bars on a supporting beam of a steel bar framework supporting system, and storing a second layer of horizontal bars on a horizontal bar positioning toothed plate of the steel bar positioning system;
S4, binding a second layer of vertical main ribs and a second layer of horizontal ribs;
s5, firstly taking out the horizontal rib positioning toothed plate, and installing a stiff framework, wherein the stiff framework and the main rib are connected into a whole;
s6, installing a connecting piece and a main rib positioning toothed plate on the stiff framework;
s7, binding residual steel bars, so that binding manufacture of the first part and the second part is completed;
S8, after the first part and the second part are bound and manufactured, firstly moving the cantilever plate, moving the extending part of the cantilever plate into a binding platform of an operating system, then moving the operating system, moving the binding platform along a platform slideway, enabling the binding platform to drive the cantilever plate to be far away from the first part and the second part, forming a hoisting space which is enough to hoist, and then installing a hoisting device in the hoisting space, and hoisting the first part and the second part in sequence through the hoisting device.
According to the invention, an integrated construction platform is formed by the operation system, the reinforcement cage support system and the reinforcement positioning system, the reinforcement cage and the stiffness framework are bound in advance on the integrated construction platform, the split segments are reserved, the main reinforcement is pre-bent on the ground through specific instruments, the design curvature of the tower column is precisely matched, the variable curvature construction of the section of the tower column is completed, the main reinforcement which is hoisted has the design curvature of the tower column, complex high-altitude operation is avoided, and the construction safety is improved.
According to the invention, the main reinforcement of the curve part of the bridge tower column is required to be pre-bent on the ground by a machine, the design curvature of the tower column is accurately matched, and the variable curvature construction of the section of the tower column is completed. And the main reinforcement positioning jig frame and the horizontal reinforcement positioning toothed plate are used for positioning the reinforcing steel bars and are bound with the stiff framework into a whole, so that the reinforcing steel bars are integrally hoisted, and the construction complexity is reduced.
The embodiments of the present invention are not limited thereto, and the above preferred embodiments may be modified, substituted or combined in various other forms, using conventional technical knowledge and conventional means in the art according to the above embodiment of the present invention, without departing from the basic technical idea of the present invention and without conflict, and all the other embodiments obtained fall within the scope of the claims of the present invention.
Claims (10)
1. The construction method for the curve variable-section bridge tower reinforcement cage block prefabrication is characterized by comprising the following steps of:
S1, building an integrated construction platform at a corresponding position according to a construction drawing design, binding in the integrated construction platform, and reserving loose splicing sections, wherein the integrated construction platform comprises an operating system, a reinforcement cage supporting system and a reinforcement positioning system;
s2, after the operation system, the reinforcement cage support system and the reinforcement positioning system are built, installing a cantilever plate in the operation system, wherein the cantilever plate can horizontally move in the operation system, and the cantilever distance of the cantilever plate is controlled through horizontal movement, so that the distance between a binding operation point and the reinforcement cage and the distance between the binding operation point and the reinforcement cage are controlled;
S3, pre-bending the main bars by using an instrument, accurately positioning the main bars by a steel bar positioning system, binding a first layer of vertical main bars and a first layer of horizontal bars on a steel bar framework supporting system, and storing a second layer of horizontal bars on the steel bar positioning system;
S4, binding a second layer of vertical main ribs and a second layer of horizontal ribs;
s5, installing a stiff framework, and connecting the stiff framework and the main rib into a whole;
s6, installing a connecting piece and a main rib positioning toothed plate on the stiff framework;
s7, binding residual steel bars, so that binding manufacture of the first part and the second part is completed;
S8, moving the cantilever plate, moving the extending part of the cantilever plate into the operating system, moving the operating system to enable the operating system to be far away from the first part and the second part to form a hoisting space, and then hoisting the first part and the second part in sequence.
2. The construction method for partitioned prefabrication of the curved variable-section bridge tower reinforcement cage of claim 1, wherein the operating system comprises a binding platform and a platform slideway, the platform slideway is fixed on the ground, and the binding platform is arranged on the platform slideway and can move along the platform slideway.
3. The construction method for the block prefabrication of the curved variable-section bridge tower reinforcement cage is characterized in that the binding platform is of a light framework structure, multiple layers of binding platforms are arranged, a protective railing is arranged on the outer side of one layer of the top of each binding platform, and each layer of the binding platform is provided with the cantilever plate capable of horizontally moving.
4. The construction method for the block prefabrication of the curved variable cross-section bridge tower reinforcement cage according to claim 3, wherein each layer of the binding platform is provided with a movable slideway, and the cantilever plate is mounted on the movable slideway through rollers to realize the horizontal movement of the cantilever plate.
5. The construction method for prefabricating the reinforcement framework of the curve variable cross-section bridge tower in a blocking mode is characterized in that in the step S8, after the first part and the second part are bound, the cantilever plate is firstly horizontally moved into a binding platform, then the binding platform is moved along a platform slideway, the binding platform drives the cantilever plate to be far away from the first part and the second part, a hoisting space enough for hoisting is formed, a hoisting device is installed in the hoisting space, and the first part and the second part are hoisted in sequence through the hoisting device.
6. The construction method for block prefabrication of the curved variable cross-section bridge tower reinforcement cage is characterized in that in the step S2, when the cantilever plate moves horizontally, the length of the cantilever plate extending out of the binding platform is 50-1500 mm.
7. The construction method for the block prefabrication of the reinforcement cage of the curve variable-section bridge tower, which is disclosed in claim 1, is characterized in that the reinforcement cage supporting system comprises a supporting beam, a telescopic tube and a supporting embedded part, the supporting embedded part is fixed on the ground, the supporting beam is hinged with one supporting embedded part, one end of the telescopic tube is hinged with the other supporting embedded part, the other end of the telescopic tube is hinged with the supporting beam, and the inclination angle of the supporting beam is controlled through the telescopic of the telescopic tube.
8. The construction method for the block prefabrication of the reinforcement cage of the curve variable cross-section bridge tower according to claim 1, wherein the reinforcement positioning system comprises a bottom main reinforcement positioning jig, a middle main reinforcement positioning jig, a top main reinforcement positioning jig and a horizontal reinforcement positioning toothed plate, wherein the bottom main reinforcement positioning jig is fixed on the ground, the middle main reinforcement positioning jig and the top main reinforcement positioning jig are fixedly arranged on the stiff framework, the horizontal reinforcement positioning toothed plate is arranged on the reinforcement cage supporting system and the stiff framework, and the reinforcement positioning system can accurately position the positions of main reinforcements and horizontal reinforcements.
9. The construction method for block prefabrication of the reinforcement cage of the curve variable cross-section bridge tower according to claim 8, wherein in the step S5, before the stiff framework is installed, the horizontal reinforcement positioning toothed plate is required to be taken out, and then the stiff framework is installed.
10. The construction method for the segmented prefabrication of the reinforcement cage of the curve variable-section bridge tower, which is characterized in that the reinforcement cage and the stiffness cage both comprise standard sections and widening lap sections, and the standard sections and the widening lap sections are connected to form the reinforcement cage or the stiffness cage.
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| CN202510097028.XA CN119824803A (en) | 2025-01-22 | 2025-01-22 | Construction method for curve variable-section bridge tower reinforcement cage block prefabrication |
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| JP2010048060A (en) * | 2008-08-25 | 2010-03-04 | Shimizu Corp | Construction method of structure |
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