JP2012026088A - Connection method and connection structure of precast floor slab with loop-like joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection method and connection structure of a precast floor slab with a loop-like joint, for which removal of a soundproof wall or the like and lifting of a safety net are not required and insertion work is facilitated.SOLUTION: In the connection method of the precast floor slab, a loop-like joints 5 of a precast floor slabs 2 with the loop-like joint which are adjacent in a bridge axial direction are dislocated in a direction perpendicular to a bridge axis and disposed, and the distal end part of a PC steel stranded wire 8 in a curved state is inserted into a loop surrounded by the mutual loop-like joints in the longitudinal direction of respective floor slab connection parts 14 from one end side in the direction perpendicular to the bridge axis in the connection parts of the precast floor slabs 2 with the loop-like joint. Also, the PC steel stranded wire 8 is successively sent in toward the other end side in the direction perpendicular to the bridge axis, and after disposing the PC steel stranded wire 8 straight in the direction perpendicular to the bridge axis, the respective loop-like joints 5 and the PC steel stranded wire 8 are embedded by a hardening material. The connection structure of the precast floor slab with the loop-like joint is attained by the method.

Description

  The present invention relates to a connecting method and a connecting structure of a precast floor slab with a loop joint having a loop joint at an end.

Conventionally, as shown in FIGS. 16 (a) and 16 (b), the precast concrete floor slab body 20 is embedded in advance so as to project both ends of the loop-shaped reinforcing bar or loop strip steel plate 21 from the precast concrete floor slab body 20. A precast concrete floor slab with a loop joint (hereinafter referred to as a precast floor slab with a loop joint) in which a loop joint 5 formed in an arc shape from each end in the thickness direction of the floor slab is projected in advance at both ends in the bridge axis direction. Or simply a precast floor slab or simply a floor slab) 2 is known (for example, Patent Document 1).
The precast floor slab 2 with a loop-shaped joint is a horizontally long floor slab in a direction perpendicular to the bridge axis. Such a precast floor slab 2 with a loop-shaped joint extends over the adjacent girders 1 parallel to the bridge axis direction. Installed with mortar as appropriate.

  As shown in FIG. 15, as shown in FIG. 15, each of the loop joints 5 protruding in the bridge axis direction is viewed from the direction perpendicular to the bridge axis. Reinforcing bars 9 are inserted and arranged in the loop shape from the right angle direction of each loop-shaped joint reinforcing bar, arranged so as to be spaced or overlapped (both are shifted in the direction perpendicular to the bridge axis). In this structure, the hardened material 4 made of concrete is placed in the space between the floor slabs (connecting part 14), and the adjacent precast concrete floor slabs are connected to each other at an interval (for example, the aforementioned patent) Reference 1).

JP 2005-83072 A

As shown in FIG. 14, when connecting the precast slab 2 with a loop joint adjacent to each other in the bridge axis direction, the reinforcing bar 9 cannot be dropped into the loop joint 5 from above. The reinforcing reinforcing bars 9 are arranged from one end side in the direction perpendicular to the bridge axis to the other end side in the direction perpendicular to the bridge axis in the loop-shaped space formed by the above. As a form for arranging the reinforcing bars 9 in the direction perpendicular to the bridge axis, a form in which the long rebar 22 of the first example shown in FIGS. 9 to 11 is arranged, and a short rebar 23 is arranged as shown in FIGS. There are two forms.
The steel material used for each of the above-mentioned reinforcing bars is a reinforcing bar with a rib (node) or a (deformed) steel bar.

In the case of the form of the first example shown in FIGS. 9 to 11, the length of the floor slab 2 is the same as the length of the floor slab in the direction perpendicular to the bridge axis from the road shoulder side end or the central separator side end. The long rebar 22 is inserted into the loop-shaped space in the connecting portion 14 using a crane, an aerial work vehicle, a long rebar suspension jig, or the like.
In this case, as shown in FIG. 9 and FIG. 10, an obstacle 26 such as a soundproof wall extends on a side of the floor slab 2 across a column 25 erected or held on a support member 24 attached to the beam 2. Since these obstacles 26 interfere with the insertion work, the obstacles such as the soundproof walls are temporarily removed as shown by the dotted lines in FIG. As indicated by the arrows in the figure, the suspension is lifted in a state where it is supported by the hanging metal fittings extended from the crane, etc., and transported in the direction perpendicular to the bridge axis as indicated by the arrows. The long rebar 22 has been disposed by being disposed so as to be sent to the wire.
Although illustration is omitted, when a safety net is provided outside the support column 25, it becomes an obstacle to insertion work of the long rebar, so that the worker becomes an obstacle to the insertion work. Another worker was inserting the long rebar 22 in a state where the safety net of the part was partially turned up and an insertion work space was secured on the side of the floor slab.

Further, as described above, when the obstacle 26 such as the soundproof wall cannot be removed, as shown in FIG. 12 and FIG. By embedding and arranging a plurality of reinforcing bars 21 in the direction perpendicular to the bridge axis (seven in the case of illustration), between the adjacent large-diameter loop reinforcing bars 21 with an interval therebetween The insertion space is ensured by providing a level difference between the upper end level of the inner diameter of the loop-shaped joint 5 made of a large-diameter loop-shaped reinforcing bar and the upper end level of the outer diameter of the loop-shaped joint 5 made of a small-diameter loop-shaped reinforcing bar. In addition, a plurality of short rebars 23 having dimensions shorter than the length of the floor slab 2 in the direction perpendicular to the bridge axis are arranged in the right direction (in the case of illustration) and the left direction (not shown), respectively. (Appropriately move multiple short rebars 23 in the direction of the bridge axis. , It is arranged close to the ends of the short reinforcing bars 23 adjacent to each other in series to the bridge axis perpendicular direction).
In this case, the short rebar 23 to be inserted is bent, and the rib of the short rebar 23 hits the loop joint 5 and resists, so that the manual insertion work may be difficult. In this case, FIG. 12 and FIG. As indicated by an arrow in FIG. 13, there is a problem that the short rebar 23 to be inserted is inserted while being hit with a large hammer or the like, and there is a problem that the short rebar 23 is damaged or noise is generated by the hit.
The present invention can solve the above-mentioned conventional problems, and can easily connect the precast floor slab with a loop joint without removing an obstacle such as a soundproof wall or lifting a safety net, and It aims at providing a connection structure.

In the method for connecting precast slabs with loop joints according to the first aspect of the invention, in the method for connecting precast slabs with loop joints having loop joints, the loop joints of precast slabs with loop joints adjacent to each other in the bridge axis direction Are placed in a direction perpendicular to the bridge axis, and the end of the PC steel stranded wire is bent toward the precast floor slab side in the bridge axis direction or the direction perpendicular to the bridge axis. Inserting into the longitudinal loop joint of each floor slab connecting portion from one end side in the direction perpendicular to the bridge axis in the connecting portion, and sequentially feeding the PC steel strand toward the other end side in the direction perpendicular to the bridge axis Then, after the PC steel strands are linearly arranged in the direction perpendicular to the bridge axis, the loop joints and the PC steel strands are embedded with a curable material.
In the second invention, in the method for connecting precast floor slabs with loop joints of the first invention, a plurality of PC steel strands are enclosed in the loop joints of the respective floor slab connecting portions in the longitudinal direction. Then, a hardenable material made of concrete or mortar is provided so as to embed each loop joint in the longitudinal direction of each floor slab connecting portion and each PC steel strand.
According to a third invention, in the method for connecting precast slabs with loop joints of the first or second invention, each PC steel strand and the loop joint are bound.
In the connecting structure of precast floor slabs with loop joints according to the fourth aspect of the invention, in the connecting structure of precast floor slabs with loop joints having loop joints, the loop joints of the floor slabs adjacent to the bridge axis direction are perpendicular to the bridge axis. PC steel stranded wire, which is arranged at a different position and curved toward the precast slab in the direction of the bridge axis or perpendicular to the bridge axis, is one end side in the direction perpendicular to the bridge axis at the joint between the precast slabs with loop joints. Inserted into the loop-shaped joint in the longitudinal direction of each floor slab connecting portion and arranged linearly, and each loop-shaped joint and the PC steel strand are embedded with a curable material. Features.

According to the first invention, in the method of connecting precast slabs with loop joints having loop joints, the positions of the loop joints of precast slabs with loop joints adjacent to the bridge axis direction are shifted in the direction perpendicular to the bridge axis. One end side in the direction perpendicular to the bridge axis at the connecting part of the precast floor slabs with loop joints with the end of the PC steel stranded wire placed and curved to the precast floor slab side in the direction of the bridge axis or perpendicular to the bridge axis Are inserted into the loop-shaped joint in the longitudinal direction of each floor slab connecting portion, and the PC steel strand is sequentially fed toward the other end side in the direction perpendicular to the bridge axis so that the PC steel strand is bridged. After linearly arranging in the direction perpendicular to the axis, each loop joint and the PC steel wire are embedded with a curable material, and therefore the PC steel wire is sent out in a straight line sequentially from a state where the wire is pre-curved. Therefore, even if the length of the joint in the direction perpendicular to the bridge axis is a long PC steel strand to the precast floor slab with a loop joint, the bridge on the precast floor slab with a loop joint and the bridge of the floor slab Using a narrow space within the scaffold width dimension in the direction perpendicular to the bridge axis provided on both sides in the direction perpendicular to the axis, the PC steel can be arranged linearly from a bent arrangement in which the wire is curved. Also, simply by using PC steel strands, it is possible to easily arrange the joints without removing the sound barriers or lifting the safety net as in the past, and the workability is improved. It is possible to greatly improve the construction cost, and it is possible to obtain an effect such that a pre-stress can be easily introduced even when prestress is introduced into the joint and a strong joint can be obtained.
According to the second invention, after arranging a plurality of PC steel strands in the loop surrounded by the mutual loop-shaped joints in the longitudinal direction of the respective floor slab connecting portions, each of the floor slab connecting portions in the longitudinal direction is arranged. In addition to the effects of the first aspect of the invention, in addition to the effects of the first invention, a plurality of PC steel wires and concrete or mortar are used. With the curable material, it is possible to obtain an effect such as a stronger joint portion.
According to the third invention, since each PC steel strand and the loop-shaped joint are bound, the effect that the PC steel strand can be supported by the loop-shaped joint and arranged at a predetermined position can be obtained.
According to the fourth invention, in the connection structure of the precast floor slabs with loop joints having the loop joints, the loop joints of the floor slabs adjacent to each other in the bridge axis direction are arranged so as to be shifted in the direction perpendicular to the bridge axis. PC steel strands curved to the precast floor slab side in the direction perpendicular to the direction of the bridge axis are connected in the longitudinal direction of each floor slab connection part from one end side in the direction perpendicular to the bridge axis at the connection part between the precast floor slabs with loop joints. Inserted into the loop-shaped joint and arranged linearly, and each loop-shaped joint and the PC steel wire are embedded with a curable material, so that the PC steel wire is curved. It can be placed in a straight line from the bent state, and it can be easily placed at the joint without removing the soundproof wall or lifting the safety net as in the past, and the workability is improved. Greatly Can be improved, it is possible to reduce the construction costs, the effects of such can be a strong joint to be readily introduced when introducing prestress is obtained at the junction.

It is the partially longitudinal front view seen from the bridge-axis direction for demonstrating the connection method of the adjacent PCa floor slab which has a loop-shaped coupling of this invention. It is a vertical side view which shows the connection part vicinity of the adjacent floor slabs in the orthogonal direction of a bridge axis for demonstrating the connection method of adjacent PCa floor slabs which have the loop-shaped coupling of this invention. The figure for demonstrating the connection method of adjacent PCa floor slabs which have the loop-shaped coupling of this invention, The state just before inserting the front end side of the bent PC steel strand in the loop-shaped space in a floor slab connection part FIG. It is a top view which shows the state where it inserted and arrange | positioned over the loop shape in the connection part of a bridge axis perpendicular direction between floor slabs, and several PC steel strands. From the state shown in FIG. 4, the hardened filler such as concrete or non-shrink mortar is filled and hardened in the connecting part (filling part) between the floor slabs, the tension of each PC steel base wire is released, and the connecting part is pre-pressed. It is a partial cross section top view which shows the state which introduce | transduced stress. It is a figure for demonstrating the connection method of the adjacent PCa floor slab which has a loop-shaped coupling of this invention, and after arrange | positioning a required number of PC steel strands in a loop-shaped space, a loop-shaped joint and PC steel strand are connected. It is a vertical side view which shows the connection part vicinity of the floor slabs seen from the bridge axis orthogonal direction which shows the state which filled the hardening part, such as concrete or mortar, in the filling part so that it might embed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a partial cross-sectional plan view illustrating a first example in the case where prestress is introduced into a joint. FIG. 9 is a partial cross-sectional plan view showing a second example in the case where prestress is introduced into a joint portion, showing an embodiment of the present invention. It is the partially longitudinal front view seen from the bridge-axis direction for demonstrating the 1st example of the connection method of the adjacent PCa floor slab which has a conventional loop joint. FIG. 10 is a partially longitudinal front view showing a part of FIG. 9 in an enlarged manner. It is a top view which shows the principal part of FIG. It is the partially longitudinal front view seen from the bridge-axis direction for demonstrating the 2nd example of the connection method of the adjacent PCa floor slab which has a conventional loop joint. It is the figure which expanded a part of 2nd example shown in FIG. 12, and was seen from the front. It is the vertical side view seen from the bridge axis perpendicular direction which shows the conventional connection structure of floor slab which arranged the reinforcing bar of the bridge axis perpendicular direction in the connection part between floor slabs. It is a vertical side view which shows the normal state which emphasized the concrete in the connection part of the conventional floor slab shown in FIG. An example of a precast floor slab is shown, Comprising: (a) is a top view, (b) is a longitudinal front view.

    Next, the present invention will be described in detail based on the illustrated embodiment.

FIGS. 1-6 is a figure for demonstrating the connection method of the precast floor slab with a loop-shaped joint of one Embodiment of this invention, Comprising: First, as shown in FIG. 1, lower structure, such as an abutment or a bridge pier, A precast floor slab 2 with a looped joint is installed over the steel girders 1 of a plurality of steel bridge girders installed in parallel at intervals in the direction perpendicular to the bridge axis via a support if necessary. 2 and 3, while the sealing material 3 made of synthetic resin or rubber sealing material is interposed, and leaking when the curable filling material 4 is filled, the bridge axis direction A precast floor slab 2 with a loop joint is installed in order. In this way, a number of the precast slabs with loop joints 2 are installed at intervals in the bridge axis direction.
The said precast floor slab 2 with a loop-shaped joint is a floor slab of the form similar to the form shown in FIG.

  The loop-shaped joints 5 of the precast floor slab 2 with the loop-shaped joints adjacent to each other in the bridge axis direction are alternately arranged at intervals (or overlapping) with a position shifted in the direction perpendicular to the bridge axis. Further, between the precast slabs with loop joints adjacent to each other in the bridge axis direction, a sealing material 3 continuous in the direction perpendicular to the bridge axis is interposed, and a curable filler 4 such as concrete or non-shrink mortar is placed. The prevention of leakage when it is done. Further, when viewed from a direction perpendicular to the bridge axis, the loop joints 5 in the floor slab 2 adjacent to each other in the bridge axis direction are arranged at the same level and overlapped in the bridge axis direction as shown in FIG. An annular loop space 6 formed so as to be surrounded by the loop joints 5 adjacent to each other in the bridge axis direction is formed, inside the one loop joint 5 and outside the other loop joint 5. The loop-shaped space 7 formed between the end faces of the floor slab 2 in the bridge axis direction is formed at intervals in the direction perpendicular to the bridge axis.

As shown in FIGS. 1 and 3, in the present invention, the precast floor slab 2 with a loop joint or the precast floor slab 2 with a loop joint has a width of about the scaffold width provided on both sides in the direction perpendicular to the bridge axis. In order to be able to work within the range, the connecting portion 14 of the precast floor slab 2 with the loop-shaped joint in the direction perpendicular to the bridge axis has a sufficient length dimension, and a bendable PC steel strand 8 is used. Yes. As said PC steel strand 8, what is necessary is just to use the PC steel wire which twisted 19 PC steel wires and made the wire outer diameter dimension 19.3 mm-21.8 mm, for example.
In the present invention, the PC steel strand 8 is used for joining the precast floor slabs 2 with loop joints, and the non-inserted portion 15 of the PC steel strand 8 is shown in FIGS. As shown in FIG. 4, by forming a curved uninserted portion 16 that is curved and arranged so as to be folded back toward the center portion in the direction perpendicular to the bridge axis, or although not shown, it is curved and arranged in the bridge axis direction. Thus, the curved uninserted portion 16 is formed.
By using the PC steel strand 8 as described above, the uninserted portion 15 can be arranged in a previously curved state and sequentially fed out, so that the length of the joint portion in the direction perpendicular to the bridge axis is long. Scaffolding width in the direction perpendicular to the bridge axis provided on the precast floor slab 2 with a loop joint and on both sides of the bridge slab perpendicular to the bridge axis, even if it is a long PC steel strand 8 for the precast slab 2 with a shape joint Using the space within the dimensions, the PC steel wire 8 can be arranged linearly with respect to the connecting portion 14 from the bent state in the curved state.
And as shown in FIG.3 and FIG.1, one end side of PC steel strand 8 is made into each said annular loop space 6 of a bridge axis orthogonal direction from the one end side of the connection part of the precast floor slab 2 with a loop joint. 1 and are sequentially fed as shown by arrows in FIG. 1, and the same operation is sequentially performed to arrange the necessary number in each annular loop space 6 so that each loop joint 5 and the wire number, etc. And are arranged at a predetermined position.
Similarly, each loop-like space in the direction perpendicular to the bridge axis is formed between the end face of the floor slab 2 in the bridge axis direction and inside the one loop-like joint 5 and outside the other loop-shaped joint 5. 7, the PC steel strand 8 is inserted from one end side in the direction perpendicular to the bridge axis and is sequentially fed, inserted and arranged in a straight line, and bound to each loop joint 5 by a number wire or the like.

  In the case of embedding and arranging without introducing tension to the PC steel strand 8, as shown in FIG. 4 and FIG. 5, the connecting portion in the direction perpendicular to the bridge axis between the precast slabs with loop joints 2 14, the necessary number of PC steel wires 8 are inserted and arranged in a straight line so as to be sequentially fed toward the other end side in the direction perpendicular to the bridge axis, and then the loop joints 5 and the PC steel wires 8 are embedded. As described above, the curable filler 4 such as concrete or non-shrink mortar is filled and cured to connect the precast floor slabs 2 with loop joints. The curable filler 4 may be filled so as to be filled with fibers such as steel fibers.

  When a tension force is introduced into the PC steel strand 8 by a pretension method and embedded, for example, as shown in FIG. 7, the crimp sleeve 10 is attached to the end of the PC steel strand 8 as shown in FIG. , And the crimping sleeve 10 is provided with a male threaded portion, so that the PC steel strand 8 with the crimping sleeve having the male threaded portion at both ends is linearly arranged as described above. After that, the end portion of the PC steel strand 8 with the crimp sleeve is fixed to the fixing plate 11 installed over the end portion in the direction perpendicular to the bridge axis of the precast floor slab 2 with the loop joint adjacent to the bridge axis direction, for example. With the end of the PC steel wire 8 inserted, the end of the PC steel wire 8 with a crimping sleeve fixed by a fixing bracket 18 such as a nut, and tension is introduced into the PC steel 8 with concrete or No shrink mole By filling and curing the curable filler 4 such as ru, and loosening the fixing bracket 18, the connecting portion 14 including the curable filler 4 can be connected by introducing prestress in a direction perpendicular to the bridge axis. it can. In addition, in the state which loosened the said fixing metal fitting 18, the rust prevention of the wire 8 from the PC steel with a crimping sleeve is aimed at. Further, the curable filler 4 may be filled so as to be filled with fibers such as steel fibers.

  In the case where tension is introduced into the PC steel strand 8 by a post-tension method and embedded, the unbonding or afterbonding treatment is applied to the outside of the PC steel strand 8 as shown in FIG. After being arranged in a straight line in the applied state or in a state where a sheath is attached to the outside of the PC steel wire 8 (not shown), the end of the PC steel wire 8 is adjacent to the bridge axis direction, for example. Insert the end of the PC steel strand 8 into the fixing plate 11 installed over the end of the precast floor slab 2 with the loop-shaped joint in the direction perpendicular to the bridge axis, and insert the end of the PC strand 8 into the nut. After fixing with the fixing bracket 18, the curable filler 4 such as concrete or non-shrink mortar is filled and cured, and when the fixing bracket 18 is tightened, tension is introduced into the wire 8 from the PC steel to form a loop. Precast with fitting It can be stressing anchorage while prestressed in the junction of the plate 2. The curable filler 4 may be filled so as to be filled with fibers such as steel fibers.

  In addition, although illustration is abbreviate | omitted, the stud gibber etc. are suitably provided in the steel girder 1, and the stud cast bell storage recessed part is suitably provided in the precast floor slab 2 with a loop-shaped joint, and a stud dowel is installed in the said recessed part. In the inserted state, the precast floor slab 2 with the loop-shaped joint is placed on the steel girder 1 and the storage recess is filled with the curable filler 4 so that the steel girder 1 and the precast with the loop-shaped joint are precast. Integration with the floor slab 2 is achieved.

  As in the previous embodiment, according to the present invention, there is no need to remove the obstacle 12 such as a soundproof wall or raise the lower part of the safety net as in the conventional case, so that workability is remarkably improved. There is an effect that the construction cost can be remarkably reduced.

  In the case of the said embodiment, although the form which inserts and arrange | positions the PC steel strand 8 from the outer side of a bridge axis orthogonal direction was shown, when implementing this invention, the precast floor slab 2 with a loop-shaped joint was constructed. Work in which the PC steel wire 8 can be arranged in a curved manner on the center separation band side when the upside elevated road body 13 and the downside elevated road body 13 are formed and a center separation band is formed between them. If the space can be secured, the PC steel wire 8 may be inserted from the central separator side and fed sequentially.

  Moreover, in the form using the PC steel strand 8 as described above, when a plurality of elevated structures in which the precast floor slab 2 with a loop joint is installed on the beam 1 in the bridge axis direction are arranged in parallel, the elevated Over the connecting part of the parallel floor slabs in the structure, a PC steel wire 8 having a length longer than the bridge width of one elevated structure is inserted from one end side and toward the other end side. You may make it insert and arrange sequentially.

  As described above, in the method for connecting precast slabs with loop joints according to the present invention, the uninserted portion (rear side or intermediate portion) of the PC steel strand 8 to be inserted is in the bridge axis direction or the bridge axis perpendicular direction. As for the state where it was curved to the precast floor slab side, the end part of the PC steel strand 8 is connected to each floor slab connecting part from one end side in the direction perpendicular to the bridge axis in the connecting part 14 between the precast floor slabs with a loop joint 2. 14 is inserted into the loop surrounded by the mutual loop-shaped joint 5 in the longitudinal direction, and the PC steel strand 8 is sequentially fed toward the other end side in the direction perpendicular to the bridge axis. After the wires 8 are arranged linearly in the direction perpendicular to the bridge axis, the wires 8 are embedded with the curable material 4 from the loop joints 5 and PC steel.

  Further, as described above, in the connection structure of the precast floor slab with a loop joint according to the present invention, in the connection structure of the precast floor slab with a loop joint having a loop joint, the loop shape of the floor slab adjacent in the bridge axis direction The joint 5 is arranged with its position shifted in the direction perpendicular to the bridge axis, and the uninserted part (rear side or intermediate part) of the PC steel strand 8 is curved to the precast slab side in the bridge axis direction or the direction perpendicular to the bridge axis. PC steel strand 8 is fed into the loop surrounded by the mutual loop-shaped joint 5 in the longitudinal direction of each floor slab connecting portion from one end side in the direction perpendicular to the bridge axis at the connecting portion between the precast floor slabs with loop-shaped joints. The loop joints 5 and the PC steel wires 8 are embedded in the curable material 4 by being inserted in this manner and arranged in a straight line.

  When practicing the present invention, the PC steel strand 8 may be a PC steel strand 8 with a sheath. The girder 1 may be an appropriate girder such as a steel girder, a reinforced concrete girder, or a box girder.

DESCRIPTION OF SYMBOLS 1 Steel girder 2 Precast floor slab with loop joint 3 Seal material 4 Hardening material 5 Loop joint 6 Loop loop space 7 Loop space 8 PC steel strand 9 Reinforcement reinforcement 10 Crimp sleeve 11 Fixing plate 12 Obstacle 13 Overpass road Body 14 Connecting portion 15 Uninserted portion 16 Curved uninserted portion 17 Crimp sleeve 18 Fixing bracket 20 Precast concrete floor slab main body 21 Loop-shaped reinforcing bar or loop-shaped steel plate 22 Long reinforcing bar 23 Short reinforcing bar 24 Support member 25 Strut 26 Soundproof wall, etc. Obstacle

Claims (4)

  In the method of connecting precast floor slabs with loop joints having loop joints, the loop joints of precast floor slabs with loop joints adjacent to the bridge axis direction are shifted in the direction perpendicular to the bridge axis, and the bridge axis direction Alternatively, the end portion of the PC steel stranded wire curved to the precast floor slab side in the direction perpendicular to the bridge axis is connected to each floor slab connection part from one end side in the direction perpendicular to the bridge axis in the connection part between the precast floor slabs with loop joints. The PC steel strand is inserted into the loop joint in the longitudinal direction of the steel plate, and the PC steel strand is sequentially fed toward the other end side in the direction perpendicular to the bridge axis so that the PC steel strand is linear in the direction perpendicular to the bridge axis. After the arrangement, the connecting method of the precast slab with loop joints, wherein the loop joints and PC steel strands are embedded with a curable material.   After arranging a plurality of PC steel strands in a loop surrounded by the loop joints in the longitudinal direction of the floor slab connecting portions, the loop joints in the longitudinal direction of the floor slab connecting portions and The method for connecting precast floor slabs with loop joints according to claim 1, wherein a hardenable material made of concrete or mortar is provided so as to embed a strand of PC steel.   The method of connecting precast slabs with looped joints according to claim 1 or 2, wherein each PC steel strand is bundled with a looped joint.   In the connection structure of precast floor slabs with loop joints having loop joints, the loop joints of the floor slabs adjacent to each other in the bridge axis direction are shifted in the direction perpendicular to the bridge axis, and the bridge axis direction or the bridge axis perpendicular direction PC steel strand curved to the precast floor slab side of the steel pipe feeds into the loop-shaped joint in the longitudinal direction of each floor slab connection from one end side in the direction perpendicular to the bridge axis at the joint between the precast floor slabs with loop joint A connecting structure of precast floor slabs with loop joints, wherein the loop joints and the PC steel strands are embedded with a curable material.

Images