WO2019164077A1 - Hybrid psc girder having reverse t-shaped cross section and method for constructing slab using same - Google Patents

Abstract

One aspect of the present invention presents a hybrid PSC girder having a reverse T-shaped cross section, the girder comprising: a lower flange; a web which is vertically formed upward from the widthwise central part of the lower flange and includes, at an upper part, a plurality of coupling holes formed therethrough or formed in a predetermined depth at an uniform interval in the longitudinal direction; a central body part having a reverse T-shaped cross section, which comprises reinforcing partition walls protruding from both sides of the web in a predetermined thickness to resist out-of-plane deformation; end partition walls formed at both lengthwise ends of the central body part in a predetermined length and having a box-type cross section; and reinforcing beams made of steel, having a predetermined length, and coupled in the lengthwise direction to opposite side surfaces of the upper part of the web between the reinforcing partition walls and the end partition walls by using coupling fasteners inserted into the coupling holes.

Description

[Revision according to Rule 26.10.2018] 26Inverse T cross-section mixed PSC girder and slab construction method using the same

The present invention prevents out-of-plane deformation of the upper abdomen when prestress is introduced into the PSC girder of the inverted T-shaped cross section, and effectively resists transverse deformation or impact due to self-weight acting on the inverted T-shaped cross section during double lifting, and the movement of the worker and the PC The present invention relates to an inverted T cross-section mixed PSC girder that can secure safety when mounting a bottom plate or formwork plate, and a slab construction method using a half-PC slab for field casting having a wide width with the PSC girder.

In general, the girder having the same width of the upper flange and the thickness of the abdomen in the center part is located at the upper edge of the girder when the fixing device is placed so that the force of the tension forces is located in the center part of the girder because the center part is located below the center part. The maximum compressive stress under load may occur in a section in which the tendon tension forms the compressive stress, and the girder for prestressing the maximum compressive stress has an excessively high mold height, thereby increasing the amount of material.

In order to solve this problem, in the case of a girder composed of an inverted T-shaped cross section in which an upper flange is removed from a general I type girder, there is a problem in that out-of-plane deformation occurs at the top side due to the introduction of prestress, or lateral deformation torsional deformation during lifting. In addition, it was not possible to stably support the slab formwork, etc. There was a problem that the mounting of the PC bottom plate or deck plate is difficult.

On the other hand, the PC slab widely used as the bridge deck method of the bridge is often made to widen the width of the PC slab considering the workability and manufacturing cost when the span is about 2.5m. At this time, the reinforcing ribs are strengthened in the span direction, that is, the longitudinal direction, but the stiffness of the transverse direction, which is perpendicular to the span, is relatively decreased, and cracks occur in parallel with the span direction during construction, so that the width of the PC slab is limited or double-sided. There is a problem in that the economy is inferior because the device is required to increase the production cost.

The present invention has been made to solve the above problems, and prevents out-of-plane deformation of the upper abdomen when prestress is introduced into the PSC girder of the inverted T-shaped cross section and transverse deformation or impact due to its own weight acting on the inverted T-shaped cross section during double lifting. It is an object to provide an inverted T cross-section mixed PSC girder that effectively resists and ensures safety when the worker moves and mounts the PC bottom plate or formwork plate.

Another object of the present invention is to increase the strength of the inverse T-type cross-section mixed PSC girder and the width direction orthogonal to the span direction even when the width is larger than the span, and to reduce the construction cost, lifting ratio and manufacturing cost It is to provide a slab construction method using a half-PC slab for in-site casting having a wide width.

According to an aspect of the present invention, the abdomen having a lower flange, a plurality of coupling holes formed in a vertical upper portion in the width direction central portion of the lower flange and a plurality of coupling holes penetrated at regular intervals in the longitudinal direction or formed at a predetermined depth; A central body portion having an inverted T-shaped cross section formed on both sides of the abdomen with a protruding length having a predetermined thickness and resisting out-of-plane deformation, and an end partition formed with a predetermined length of a box-shaped cross section at both ends in the longitudinal direction of the central body portion; And an inverted T-shaped cross-section mixed PSC girder comprising a reinforcing beam made of steel of a predetermined length and coupled longitudinally to both sides of the upper part of the abdomen between the reinforcing partition and the end partition using a coupling fastener inserted into the coupling hole. do.

A joint surface is formed at the end of the reinforcing partition wall side of the reinforcing beam so as to contact the reinforcing partition wall, and a joint adjacent to the reinforcing beam in the longitudinal direction is connected to each other using a connecting member penetrating the reinforcing partition wall to generate the upper part of the abdomen when the prestress is introduced. The deflection deformation may be such that the reinforcing partition and the reinforcing beam are integrally resisted with the abdomen of the inverted T-shaped cross section.

And the connecting portion of the central body portion and the end partition wall is formed with a transition section which is a cross-sectional section for changing the cross section, the reinforcement stem protruding to each side to a certain thickness from both the upper end portion and the lower portion in the abdomen of the central body portion is further formed Can be.

In addition, the central body portion and the end bulkhead protrude upwardly with a width smaller than the width of the abdomen in the widthwise direction of the upper portion to form an upper protrusion, and a stepped protrusion is formed on both sides of the upper protrusion and the upper surface of the abdomen and the end bulkhead. And, the upper part of the reinforcing beam may be additionally installed to form a stump to the same height as the stepped jaw.

According to another aspect of the present invention, in the slab construction method using the inverted T-type cross-section mixed PSC girder, (a) preparing and preparing an inverted T-shaped cross-section mixed PSC girder, (b) a single span or two spans Mounting an inverted T-shaped cross-section mixed PSC girder between the substructure (A) and the undercarriage (B) in a bridge having an ideal structure; (c) end and reinforcement bulkheads of the inverse T-shaped cross-section mixed PSC girder adjacent to each other; Connecting each other with reinforcing bars and installing formwork, (d) mounting a half PC slab on top of an inverted T-section mixed PSC girder, (e) an upper part of an inverted T-section mixed PSC girder and a half PC slab It proposes a slab construction method using an inverted T-shaped cross-section mixed PSC girder, comprising the step of assembling the reinforcing bar and pouring the slab concrete and (f) removing the reinforcing beam.

In the step (d), the half PC slab is a half PC slab main body in which the reinforcing bars are lattice arranged in the thickness in the longitudinal direction and the width direction, and a pair of meshes so as to form a pour space in the center spaced apart at regular intervals. It is arranged to cross in the longitudinal direction and the width direction in the upper portion of the half PC slab body, embedded in the half PC slab body from the lower end to a certain height, the exposure of the upper portion of the half PC slab body so that a pair of meshes are maintained at regular intervals It includes a longitudinal reinforcing mesh member and a widthwise reinforcing mesh member is installed a plurality of gap retaining material for connecting a pair of meshes in the portion.

In addition, each of the end shear reinforcing members may be configured such that the lower end portion is embedded in the half PC slab body and protrudes upward at predetermined intervals from both ends in the longitudinal direction of the upper part of the half PC slab body.

The pair of meshes may be embedded in the half PC slab body in a diagonal line so as to form a wide space between the upper portions and a narrow space between the lower portions.

In addition, the pair of meshes may have a locking step bent at a predetermined position in the height direction so that the interval between the upper portion and the interval between the lower portion is formed narrow.

The net body may be bent at the lower end portion embedded in the half PC slab body to form an anchor jaw, and the anchor jaw may be fixed to the longitudinal and widthwise reinforcing bars inside the half PC slab body.

On the other hand, a shear synthesis member protruding to a predetermined length above the longitudinal reinforcement mesh member and embedded in the half PC slab body from a lower end thereof to a predetermined height may be further installed between the pair of meshes of the longitudinal reinforcement mesh member.

In addition, the compression fixation dispersion reinforcing bar is embedded in the longitudinal direction of the half PC slab body so that a predetermined length protrudes at both ends in the longitudinal direction of the half PC slab body, the compression fixing dispersion reinforcing bar is embedded height and half PC slab of the half PC slab body The heights of the exposed portions at the longitudinal ends of the main body may be the same, or may be bent and formed such that the heights of the exposed portions at the longitudinal ends of the half PC slab main bodies are high.

In addition, joints are provided in the width direction both ends of the half PC slab body so that a predetermined length is protruded, respectively, the upper edge of the width direction both ends of the half PC slab body may be chamfered to form a joint surface.

In addition, a shear tie may be further provided at both ends of the longitudinal reinforcing mesh member so as to intersect the shear composite member between the pair of meshes of the longitudinal reinforcing mesh member, and one side of the shear tie is connected to the shear composite member. Crossed, the other side may be configured to protrude to the outside of the end of the longitudinal reinforcing mesh member.

On the other hand, concrete is poured into the placing space of the pair of meshes of the longitudinal reinforcing mesh member and the widthwise reinforcing mesh member to form longitudinal ribs and width ribs integrally with the half PC slab body.

Inverted T cross-section mixed PSC girder of the present invention is to form a central inner portion of the reverse T-shaped cross-section and both ends of the box-shaped end partitions can significantly reduce the amount of material, that is the weight of the girder and the center of gravity of the girder is further lower Being located in the can increase the stability of the girder rotation during lifting and girder conduction during girder mounting.

In addition, a reinforcing beam is formed in the upper part of the abdomen in the longitudinal direction to prevent out-of-plane deformation of the upper side in the reverse T-shaped cross section according to the introduction of prestress, and effectively prevents lateral deformation or impact due to its own weight acting on the reverse T-shaped cross section during double lifting. It is resistant to the top exposed surface of the inverted T-shaped section, and it has the effect of enabling the worker to move safely and to support the safety when working on the PC floor plate and formwork plate.

In addition, the half PC slab to be applied to the present invention has a formwork for forming ribs and a reinforcing mesh member to have a draw or shear resistance function on the upper portion of the slab body is protruded in both directions to facilitate the construction of concrete on the reinforcing mesh member In order to form a bi-directional rib in the upper part of the slab body by pouring the, it can increase the strength of the width direction orthogonal to the span direction as well as the span direction even when the width is larger than the span, and can reduce the construction cost, lifting ratio and manufacturing cost There is.

Therefore, the construction method of the slab applying the inverted T-type cross-section type PSC girder and the half PC slab according to the present invention is to reduce the number of lifting due to the safety of the operator during construction, the prevention of falling risk during mounting, and the application of a wide half PC slab. There is an effect that can reduce the weight-cost and thereby the construction cost.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.

1 is a perspective view of an inverted T cross-section mixed PSC girder of the present invention.

2 is an exploded perspective view of FIG. 1.

3 is an enlarged perspective view of the center inner portion of FIG. 1.

Figure 4 is a cross-sectional view showing various embodiments of the coupling hole of the inverted T-type cross-section mixed PSC girder of the present invention.

5 is a perspective view showing an embodiment in which a transition unit is formed in an inverted T-type cross-section mixed PSC girder of the present invention.

6 is a cross-sectional view showing an embodiment in which the reinforcing stem is formed in the inverted T cross-section mixed PSC girder of the present invention.

7 is a cross-sectional view illustrating various embodiments of the reinforcing beam of the present invention.

8 is a view schematically showing a slab construction method using an inverted T-type cross-section mixed PSC girder of the present invention.

9 is a perspective view of a half PC slab for in-site casting having a wide width in which the reinforcing mesh member of the present invention is constructed.

10 is a cross-sectional view cut along the width direction of FIG. 9.

11 is a perspective view of another embodiment of a half PC slab.

12 is a cross-sectional view of various embodiments cut longitudinally of the half PC slab shown in FIG. 11.

FIG. 13 is a cross-sectional view of the half PC slab illustrated in FIG. 11 in the width direction.

14 is a sectional view of yet another embodiment of a half PC slab.

15 is a perspective view of an embodiment in which concrete is poured into the reinforcing mesh member so that ribs are formed.

In the following the present invention will be described in detail with reference to the embodiments shown in the accompanying drawings, but the embodiments presented are exemplary for a clear understanding of the present invention is not limited thereto.

1 is a perspective view of an inverted T-shaped cross-section mixed PSC girder of the present invention, Figure 2 is an exploded perspective view of the Figure 1, Figure 3 is an enlarged perspective view cut in the inner central portion of Figure 1, Figure 4 is a view of the present invention It is sectional drawing which shows various embodiments of the coupling hole of the inverted T type cross section mixing type PSC girder.

Inverted T-type cross-section type PSC girder 1 of the present invention, as shown in Figures 1 to 3, the central body portion 10 having an inverted T-shaped cross section is formed in a predetermined length, the central body portion 10 Box-shaped end partitions 20 are integrally formed at both ends of the cross-section, and the reverse T-type and box-shaped cross sections are mixed. A plurality of strands 50 are disposed on the abdomen 12 or the lower flange 11 of the central body portion 10, and both ends thereof are fixed to the end partition walls 20, respectively.

In particular, in the present invention, when the prestress is introduced to the strand 50 by combining the reinforcement beam 40 made of steel to both sides of the upper end of the abdomen 12 of the central body portion 10, the upper side receives a tensile force in the inverse T-shaped cross section. Out-of-plane deformation can be prevented from occurring, and the reverse T-type cross-section mixed PSC girder 1 can effectively resist lateral deformation or external shock due to its own weight, and can also be used for safe movement of workers or PC floor plates or form plates. It has a support beam function to mount the to ensure the safety during work.

The reinforcing beam 40 having a predetermined length is disposed on the abdomen 12 continuously up to the end partition 20 with the reinforcing partition 13 described below and the fastening fastener 41 fixed to the coupling hole 121. Using the central body portion 10 is integrally coupled to both sides of the upper end of the abdomen 12. Therefore, the curvature of the inverted T-section mixed PSC girder 1, which may occur during construction, with the reinforcement partition 13 and the reinforcement beam 40 having a diaphragm function as a bending rigid body against the upper deformation of the inverse T-shaped cross section is minimized. can do.

The central body portion 10 is a plate-shaped lower flange 11 of the predetermined size, and the abdomen 12 formed in a vertical upper portion with a width narrower than the width of the lower flange 11 at the central inner side in the width direction of the lower flange 11. ) And a reinforcement partition 13 formed to have a protruding length at a predetermined thickness on both sides of the abdomen 12, and is formed to have an inverted T-shaped cross section in which a top flange is removed from a general I-type girder.

As such, by having the inverted T-shaped cross section of the upper flange removed, the material amount of the girder, that is, the weight of the girder can be greatly reduced, and the center of gravity of the girder is located below the I-shaped cross section so that the girder at the time of lifting Stability against girder conduction during rotation and girder mounting is increased. In addition, the extra reinforcing bar disposed on the upper flange is eliminated to reduce the amount of rebar, as well as the workability is greatly improved because there is no rebar assembly work on the upper side of the girder when manufacturing the girder. Furthermore, the formability of the formwork is not only easy due to the absence of the upper flange, but also the girder lateral spacing in the girder shop for the formwork installation and demoulding is reduced, making the production site smaller and the number of girders that can be manufactured in one cycle of work. Can be increased.

In the abdomen 12, as shown, the coupling holes 121 are formed at regular intervals in the longitudinal direction at the upper part of the predetermined height, so that the reinforcing beam 40, which will be described later, may be coupled using the coupling fasteners 41. To be able.

The coupling hole 121 may be formed to penetrate the abdomen 12 in the width direction, as shown in FIG. 4 (a), and as shown in FIG. 4 (b), in the width direction on both sides of the abdomen 12. It may be to be formed to a predetermined depth, respectively, furthermore, the coupling hole 121 may be a screw thread is formed on the inner peripheral surface to facilitate the coupling of bolts and the like.

The reinforcement partition 13 is formed to protrude one or a plurality of at regular intervals on both sides of the abdomen 12, the protruding length must have a protruding length equal to or less than the lower flange for the connection between the reinforcement bulkhead 13 Rebar assembly or formwork installation is easy. That is, after the construction of several inverse T-type cross-section mixed PSC girder (1) in the same span, the end bulkhead facing each other so as to have an equal bridge lateral stiffness for the adjacent inverse T-shaped cross-section mixed PSC girder (1) and the passing vehicle The construction which integrates 20 and the 1 or more reinforcement partition 13 which mutually opposes each other can be simplified.

In particular, in the present invention, since the reinforcing beams 40 are respectively segmented on both sides of the reinforcing partition 13, adjacent reinforcing beams 40 are placed on the upper part of the abdomen 12 of the inverted T-shaped cross section when the prestress is introduced into the lower flange. In order to act integrally in response to the exerting tensile force or out-of-plane deformation, the longitudinal end of the reinforcing partition 13 side of the reinforcing beam 40 is bent to contact the reinforcing partition 13 or a separate steel plate is joined to the joint surface. (49), and the reinforcing beam 40 on both sides of the reinforcing bulkhead 13 and the reinforcing beam 40 adjacent to the reinforcing bulkhead 13 are formed by connecting members 80 such as steel bars, bolts, through bolts, and fasteners. Reinforcing beams positioned on both sides of the reinforcing partition 13 by fastening and connecting to the joint surface 49 and the joining surface 49 of the reinforcing beam 40 on both sides of the reinforcing partition 13 with the connecting member 80, respectively. 40 may be connected.

The end bulkhead 20 has a rectangular cross section, as shown in FIGS. 1 and 2, to prevent the inversion of the inverse T-shaped cross-section mixed PSC girder 1 and to accommodate the fixing device of the strand 50. .

At this time, the height of the end partition wall 20 may be formed to be the same as the height of the central body portion 10, the width may be formed to be the same as the width of the lower flange 11, the length is geometrically to accommodate the fixing device In consideration of the length can be made a variety.

In particular, the central body portion 10 and the end partition wall 20 protrude upward in a width smaller than the width of the abdomen 12 in the width direction central portion of the upper end portion is formed with the upper protrusion 18, the upper protrusion 18 By placing the stepping jaw 19 on both sides of the side and the upper surface of the abdomen 12 and the end partition 20, it is possible to easily mount the half PC slab, deck plate, etc. to the stepping jaw (19) have.

FIG. 5 is a perspective view showing an embodiment in which a transition part is formed in an inverted T-type cross-section mixed PSC girder of the present invention, and FIG. 6 is a cross-sectional view showing an embodiment in which a reinforcing stem is formed in an inverted T-shaped cross-section mixed PSC girder of the present invention. .

In the present invention, as shown in Figure 5, the connecting portion of the central body portion 10 and the end partition wall 20 can be formed so that the transition portion 30, which is a cross-sectional section for changing the cross section.

On the other hand, as shown in Figure 6, the abdomen 12 is protruded to both sides from the upper end to a predetermined interval from each side to a certain thickness so that the reinforcing stem 17 is formed, to make a long span girders or workers in the upper part of the abdomen 12 It is possible to reinforce the tensile stiffness against the upper deformation during expansion or to secure the space for PC slab mounting and introduction of prestress.

The central body portion 10 and the end partition wall 20 are integrally formed of concrete, and a plurality of strands 50 pass through the abdomen 12 or the lower flange 11 of the central body portion 10 to both ends. Are respectively positioned in the end partition 20 to be fixed.

As shown in FIGS. 1 and 2, the end anchoring of the strand 50 may be arranged in a single row arrangement or a two-row arrangement, although not shown, to be fixed.

As shown in FIGS. 2 and 3, a coupling fastener 41 is inserted into the coupling hole 121 of the abdomen 12 of the central body part 10, and the reinforcing beam 40 is inserted into the central body part 10 abdomen. Make sure that you can join the top of the.

The reinforcing beam 40 is made of steel of a predetermined length and is arranged in the longitudinal direction of the abdomen 12 on both sides of the abdomen 12, a variety of coupling fasteners, such as known bolts, through bolts, fasteners fixed to the coupling hole 121 41 may be used to be coupled to the upper portion of the central body portion 10 abdomen.

The reinforcing beam 40 may be formed through the coupling hole to correspond to the interval of the coupling hole 121, it may be made of a variety of cross-section made of steel.

7 is a cross-sectional view illustrating various embodiments of the reinforcing beam of the present invention.

As shown in Figures 1 to 3, the reinforcing beam 40 may be formed to have a c-shaped or b-shaped cross section (not shown), as shown in Figure 7, c-shaped. It can be made of various cross sections such as ㅁ, H, and y.

Such a reinforcing beam 40 can effectively resist out-of-plane deformation, transverse deformation, impact, etc. In particular, the top wood 60 is configured to form the same height as the stepping jaw 19 above the reinforcing beam 40 In addition, it is possible not only to allow the worker to move safely on the uppermost exposed surface of the inverted T-shaped cross section, but also to mount the lower part of the half PC slab, the deck plate, etc. when the half PC slab, the deck plate, etc. You can make it more supportive.

8 is a view schematically showing a slab construction method using an inverted T-type cross-section mixed PSC girder of the present invention.

The slab construction method using the inverse T-type cross-section mixed PSC girder of the present invention, first, as shown in Figure 8a, prepared by preparing the inverse T-type cross-section mixed PSC girder (a), a single span or two or more spans In a bridge having a structure, an inverted T cross-section mixed PSC girder 1 is mounted between the substructure A and the substructure B (b).

Thereafter, the end bulkheads 20 formed at both ends of the inverse T-type cross-sectional mixed PSC girder 1 and the end bulkheads of the inverted T-shaped cross-sectional mixed PSC girder 1 adjacent to each other adjacent to one or more reinforcement bulkheads 13. (20), the reinforcing bulkheads 13 are connected to each other with reinforcing bars, and the formwork is constructed (c), and as shown in FIG. 8B, a half PC slab 7 is mounted on the upper part of the inverted T cross-section mixed PSC girder 1. (D).

Subsequently, as shown in FIG. 8C, reinforcing bars are assembled on the upper part of the inverted T-type mixed PSC girder 1 and the half PC slab 7 and the slab concrete 9 is poured (e). At this time, the reinforcement partition 13 of the inverse T-type cross-section type PSC girder 1 and the inverse T-type cross-section type PSC girder 1 is connected to each other to form a crossbeam 8.

Finally, when the slab concrete 9 reaches a certain strength, the reinforcing beam 40 is removed (e).

Half PC slab (7) applied to the present invention is to form a reinforcing mesh member to have a formwork and a pull or shear resistance function for forming ribs on the upper part of the slab body to protrude in both directions to the concrete on the reinforcement mesh member in the field It is to be able to easily form a two-way rib by pouring.

FIG. 9 is a perspective view of a half PC slab for field pouring having a reinforcing mesh member of the present invention having a wide width, and FIG. 10 is a cross-sectional view of the width direction of FIG. 9.

As shown in Figure 9, the reinforcing mesh member of the present invention is constructed and has a wide width of the half PC slab (7) is a predetermined size of the half PC slab body 70, the upper half of the half PC slab body 70 It is formed to protrude in and comprises a longitudinal reinforcing mesh member 720a and a widthwise reinforcing mesh member 720b respectively formed in the longitudinal direction and the width direction of the half PC slab body 70.

The half PC slab main body 70 according to the present invention has a wider width than the conventional PC slab, but the thickness of the half PC slab main body 70 may be variously formed, but is preferably formed to be 50 mm or more, and FIG. 10. As in, the reinforcing bar 711, 712 in the longitudinal direction and the width direction within the thickness of the half PC slab body 70 is arranged to lattice.

A longitudinal reinforcement mesh member 720a and a width direction reinforcement mesh member 720b are installed on the upper surface of the half PC slab main body 70 to form ribs by placing concrete additionally in the field in the longitudinal direction as well as in the width direction. do. The longitudinal reinforcing mesh member 720a and the widthwise reinforcing mesh member 720b are disposed to intersect with each other, and a plurality of longitudinal reinforcing mesh members 720a may be formed in parallel with a predetermined distance.

The longitudinal reinforcing mesh member 720a and the widthwise reinforcing mesh member 720b are spaced apart at regular intervals so that a space between the pair of meshes 721 and the pair of meshes 721 is formed to form a pouring space in the center. It consists of a plurality of spacing members 722 connecting the pair of meshes 721,721 to be maintained.

The mesh 721 may be configured using various known ready-made products such as metal lath, metal mesh with a lattice mesh, and as shown in FIG. 10, embedded in the half PC slab main body 70 to a predetermined height from a lower end thereof. Paired to increase adhesion to post-cast concrete and resist vertical drawing and shearing.

The spacer 722 is made of a variety of known materials such as bolts and rebars so that the gap between the pair of meshes 721 is maintained.

In addition, as shown in FIG. 10, the tension member 790 made of a stranded wire, a steel rod, or the like is embedded in the longitudinal direction of the half PC slab main body 70, so that the prestress is introduced into the half PC slab main body 70 by bending. Strength can be increased.

FIG. 11 is a perspective view illustrating another embodiment of a half PC slab, and FIG. 12 is a cross-sectional view of various embodiments in which the half PC slab shown in FIG. 11 is longitudinally cut, and FIG. 13 is a half PC slab shown in FIG. It is sectional drawing cut in the width direction.

As illustrated in FIGS. 11A and 11B, a shear synthesis member 730 may be further installed between the pair of meshes 721 constituting the longitudinal reinforcing mesh member 720a. The shear composite member 730 is embedded in the half PC slab body 70 so as to protrude a predetermined length above the longitudinal reinforcing mesh member 720a, and is placed in the interior of the pair of meshes 721 and the longitudinal reinforcing mesh It is possible to increase the synthetic force between the member 720a and the concrete poured on the widthwise reinforcing mesh member 720b.

The shear composite member 730 may be formed in the entire length of the longitudinal reinforcing mesh member 720a, may be formed only in a portion of the central portion, or may be formed only in a portion of the end portion.

In particular, as shown in Figures 11a, 13 and 12a (a), the shear composite member 730 is arranged in the longitudinal direction of the planar or three-dimensional truss muscle so that the lower portion is embedded in the half PC slab body 70 to a certain depth As shown in FIG. 12A (b), a dowel bar having a shape in which a bar is bent may be embedded at a predetermined interval, or as shown in FIG. 12B (a), a member bent in a U shape may be used. As shown in FIG. 12B (b), a member bent into a wave may be used.

In addition, as shown in FIG. 11B, the end shear reinforcing members 770 are respectively embedded in the half PC slab main body 70 at predetermined intervals from both end portions in the longitudinal direction of the upper part of the half PC slab main body 70 inwardly. It may be configured to protrude upward to improve the resistance against in-plane shearing force at the ends of the half PC slab 7.

As the end shear reinforcing member 770, a truss muscle may be used as shown, and although not shown, members used as the shear synthesis member 730 shown in FIG. A member bent at regular intervals, a member bent in a U shape may be used, or a member bent in a wave form may be used.

On the other hand, the compression-fixed dispersion reinforcing bar 750 is embedded in the longitudinal direction of the half PC slab main body 70 so that a predetermined length protrudes at both ends in the longitudinal direction of the half PC slab main body 70, and the half PC slab main body 70 by the working load. It can be used to resist the compressive stress generated in the connection between

In particular, the compression set dispersion dispersion reinforcement 750 is bent to form a high height of the exposed portion at the longitudinal end of the half PC slab body 70, so that the bent portion is embedded in the portion subjected to the end bending compression stress It is possible to more effectively disperse the compressive stress.

In addition, the half PC slab main body 70 is a part of the upper edge of the width direction both ends of the half PC slab main body 70 to be chamfered to form a joint surface 719, the reinforcing mesh member is constructed and has a wide field cast The half PC slab 7 and the reinforcing mesh member are composed and the thickness is increased in the joint surface with the topping concrete, which is additionally placed between the half PC slab 7 for widespread field casting. In order to prevent the concrete to form a thick space to be poured.

Furthermore, the two-way slab muscles 760 are formed such that both end portions of the half PC slab main body 70 protrude in a predetermined length, so that when the half PC slab main body 70 continues in the width direction, the half PC slab main body ( 70) and the joint back muscle 760 can be embedded in the upper part of the joint of the half PC slab main body 70 at the time of concrete placement, thereby improving the width strength and continuity.

In addition, as shown in FIGS. 12C and 12D, the shear tie bars 780 are formed at both ends of the longitudinal reinforcement mesh member 720a in the longitudinal direction, so that concrete is poured into the placing space of the pair of meshes 721. When forming the longitudinal ribs 740a and the width ribs 740b integrally with the half PC slab body 70, the shear tie 780 can reinforce the ribs by shear composite behavior such as strut-tie. You can do that.

Such a shear tie 780 may be configured to intersect with the shear composite member 730 between the pair of meshes 721 of the longitudinal reinforcing mesh member 720a, so as to perform the shear synthesis function at the end, As shown in Figure 12c, it may be configured not to protrude from the end, as shown in Figure 12d, one side to cross the shear synthesis member 730, the other side to the outside of the end of the longitudinal reinforcing mesh member (720a) It may be configured to protrude to add a fixing function for compression at the end.

Shear tie 780 may be composed of a wire rod or a bent rebar of a predetermined length, as shown, may be formed in a U-shape by bending the end of one side.

14 is a sectional view of yet another embodiment of a half PC slab.

10 and 13, the pair of meshes 721 constituting the longitudinal reinforcing mesh member 720a and the widthwise reinforcing mesh member 720b may be configured such that the gap between the upper portion and the lower portion thereof is wider. As shown in FIG. 14A (a), the gap between the upper part and the lower part may be made to be embedded in the half PC slab main body 70 diagonally, or as shown in FIG. 14A (b). By forming a locking step 7141, which is bent at a predetermined position in the height direction so that a gap between the lower part and the gap between the lower part is wider, the compression area can be increased and the resistance can be effectively resisted to vertical drawing or shearing.

In particular, as shown in Figure 14b, the net body 721 is bent at the lower end portion embedded in the half PC slab body 70 to form an anchor jaw (721a) can be easily fixed while the position of the net body 721 Can be resisted by the anchorage effect. The anchor jaw 721a may be formed by bending the lower end of the mesh 721 inward or outward, and the longitudinal and / or widthwise reinforcing bars 711 and 712 inside the half PC slab body 70. It can be fixed by using a variety of known means such as welding, assembly band.

15 is a perspective view of an embodiment in which concrete is poured into the reinforcing mesh member so that ribs are formed.

As shown in Figs. 14 and 15, the half PC slab body 70 by placing concrete in the placing space between the pair of meshes 721 of the longitudinal reinforcing mesh member 720a and the widthwise reinforcing mesh member 720b. The longitudinal ribs 740a and the widthwise ribs 740b may be formed integrally with each other.

As described above, in the present invention, when forming ribs on the upper part of the half PC slab main body 70, a separate die is not required, and a pair of meshes of the longitudinal reinforcing mesh member 720a and the widthwise reinforcing mesh member 720b are used. 721 acts as a formwork to form the longitudinal ribs 740a and the width ribs 740b, but also functions as in-plane shearing or pull-out resistance with topping concrete that is post-installed upon concrete post-installation on top. You can do it.

So far, the present invention has been described in detail with reference to the presented embodiments, but those skilled in the art may make various modifications and modifications without departing from the technical spirit of the present invention with reference to the presented embodiments. will be. The invention is not limited by the invention as such variations and modifications but only by the claims appended hereto.

The present invention can significantly reduce the amount of concrete required by presenting the bridge girder of the inverted T-shaped cross-section shape with the upper flange removed, and can improve the stability against girder rotation during lifting and girder conduction during girder mounting. It is a very useful invention. In addition, when the pre-stress is introduced in the inverted T-shaped cross-section in which the upper flange is removed, it is an invention that can effectively resist the out-of-plane deformation of the upper abdomen, the lateral deformation in the double weight or the external impact.

In addition, the half PC slab to be applied to the present invention to easily form a bi-directional rib in the upper portion of the slab body in the field, even if the width increases compared to the span to increase the strength of the width direction orthogonal to the span direction as well as the span direction. It has a very useful effect to reduce construction cost, weight and manufacturing cost.

Claims (15)

An abdomen having a lower flange (11) and a plurality of coupling holes (121) formed at a vertical upper portion in a widthwise center portion of the lower flange (11) and penetrating at regular intervals in a longitudinal direction or formed at a predetermined depth ( 12) and a central body portion 10 having an inverted T-shaped cross section formed of reinforcing partitions 13 formed on both sides of the abdomen 12 with a protruding length of a predetermined thickness to resist out-of-plane deformation; An end partition wall 20 formed at a predetermined length of a box-shaped cross section at both longitudinal ends of the central body part 10; Reinforcement is made of steel of a certain length and is coupled to the longitudinal direction on both sides of the upper portion of the abdomen 12 between the reinforcing partition 13 and the end partition 20 using a coupling fastener 41 inserted into the coupling hole 121 Inverted-T cross-section mixed PSC girder, characterized in that it comprises a beam (40). The method according to claim 1, A joint surface 49 is formed at the end portion of the reinforcement partition wall 13 so as to contact the reinforcement partition wall 13 and the longitudinally adjacent reinforcement beam 40 passes through the reinforcement partition wall 13. Reinforcing partition 13 and reinforcing beam 40 are formed in the inverted T-shaped cross section of the inverted T-shaped cross section by bending the joint surface 49 to each other by using the member 80. Inverted T-shaped cross-section mixed PSC girder, characterized in that to integrally resist). The method according to claim 1, In the connecting portion of the central body portion 10 and the end partition wall 20, a transition portion 30, which is a cross-sectional section for changing the cross section, is formed, Inverted T-type cross-section mixed PSC girder, characterized in that the abdomen 12 is formed with a reinforcing stem (17) protruding at a predetermined thickness on both sides from the upper end to a predetermined section from the lower end. The method according to claim 1, The central body portion 10 and the end partition wall 20 protrude upward in a width smaller than the width of the abdomen 12 in the widthwise central portion of the upper end portion so that the upper protrusion 18 is formed, so that the upper protrusion 18 Stepping jaw 19 is formed on both sides and the upper surface of the abdomen 12 and the end partition wall 20, Inverted T-shaped cross-section mixed PSC girder, characterized in that the wood block 60 is installed on the upper portion of the reinforcing beam 40 to form the same height as the stepping jaw (19). In the slab construction method using the inverted T-type cross-sectional mixed PSC girder according to any one of claims 1 to 4, (a) preparing and preparing an inverse T-type cross-section mixed PSC girder (1); (b) mounting an inverse T-shaped cross-section mixed PSC girder (1) between the substructure (A) and the substructure (B) in a bridge having a single span or two span or longer structure; (c) connecting the end bulkheads 20 and the reinforcing bulkheads 13 of the inverse T-shaped cross-section mixed PSC girder 1 adjacent to each other with reinforcing bars and installing formwork; (d) mounting a half PC slab 7 on top of an inverted T-type mixed PSC girder 1; (e) assembling the reinforcing bar on the upper part of the inverted T-type mixed PSC girder 1 and the half PC slab 7 and placing the slab concrete 9; And (f) removing the reinforcing beam 40; slab construction method using an inverted T-type cross-section mixed PSC girder, characterized in that it comprises a. The method according to claim 5, In step (d), the half PC slab 7 is A half PC slab body 70 in which the reinforcing bars 711 and 712 are lattice arranged in thickness in the longitudinal direction and in the width direction; It is composed of a pair of meshes 721 spaced apart at regular intervals to form a pour space in the center, is arranged to cross in the longitudinal direction and the width direction in the upper portion of the half PC slab body 70, half PC to a certain height from the lower portion A plurality of gaps are embedded in the slab main body 70 and connect the pair of nets 721 in the exposed portion of the upper part of the half PC slab main body 70 so that the pair of nets 721 are maintained at regular intervals. Slab construction method using an inverted T-type cross-section mixed PSC girder, characterized in that it comprises a; (722) longitudinal reinforcement mesh member (720a) and the widthwise reinforcement mesh member (720b) is installed. The method according to claim 6, The end shear reinforcing members 770 are respectively embedded in the half PC slab main body 70 in a predetermined section from both ends in the longitudinal direction of the upper part of the half PC slab main body 70 to protrude upward. A slab construction method using an inverted T cross-section mixed PSC girder. The method according to claim 6, The pair of nets 721 is a slab construction method using an inverted T-shaped cross-section mixed PSC girder, characterized in that the buried in the half PC slab main body 70 in a diagonal line so that the interval between the upper portion is wider and the interval between the lower portion is formed narrowly. . The method according to claim 6, The pair of meshes 721 has an inverted T-shaped cross-section mixed PSC girder, characterized in that the engaging jaw (7211) is bent at a predetermined position in the height direction so that the gap between the upper portion is wider and the gap between the lower portion is narrower. Slab construction method using The method according to claim 6, The net body 721 is bent lower end portion embedded in the half PC slab body 70 is formed anchor jaw (721a), The anchor jaw (721a) is a slab construction method using a reverse T-type cross-section mixed PSC girder, characterized in that fixed to the longitudinal and width reinforcing reinforcement (711) (712) inside the half PC slab body (70). The method according to claim 6, A pair of shear reinforcing mesh members 720a has a shear composite member 730 projecting upwards a predetermined length above the longitudinal reinforcing mesh member 720a and embedded in the half PC slab body 70 from its lower end to a predetermined height. Slab construction method using an inverted T-type cross-section mixed PSC girder, characterized in that installed between the mesh 721. The method according to claim 6, Compression-fixed dispersion reinforcing bar 750 is embedded in the longitudinal direction of the half PC slab body 70 so as to protrude a predetermined length in both longitudinal directions of the half PC slab body 70, Compression fixing dispersion reinforcing bar 750 is the same as the height of the embedded height of the half PC slab body 70 and the exposed portion at the longitudinal end of the half PC slab body 70, or the half PC slab body 70 Slab construction method using an inverted T-shaped cross-section mixed PSC girder, characterized in that the bent to form a high height of the exposed portion at the longitudinal end of the. The method according to claim 6, A joint back muscle 760 is installed at both ends of the half PC slab main body 70 in a width direction so as to protrude a predetermined length, and the upper edges of both ends of the half PC slab main body 70 in the width direction are partially chamfered to form a joint surface ( 719) is a slab construction method using an inverted T-type cross-section mixed PSC girder, characterized in that formed. The method according to claim 6, Shear ties 780 are respectively formed at both ends of the longitudinal reinforcement mesh member 720a in the longitudinal direction so as to intersect with the shear synthesis member 730 between the pair of meshes 721 of the longitudinal reinforcement mesh member 720a. , One side of the shear tie bar 780 intersects with the shear compounding member 730, and the other side of the inverted T-shaped cross-section mixed PSC girder, characterized in that configured to protrude to the outside of the end of the longitudinal reinforcing mesh member (720a). Slab construction method using The method according to claim 6, Concrete is poured into the placing space of the pair of meshes 721 of the longitudinal reinforcing mesh member 720a and the widthwise reinforcing mesh member 720b to integrally form the longitudinal rib 740a and the half PC slab body 70. Slab construction method using an inverted T-type cross-sectional mixed PSC girder, characterized in that the width direction rib (740b) is formed.

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