JP2001132149A - Precast concrete floorboard for viaduct, viaduct and construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precast concrete floorboard for a viaduct having good durability and capable of being constructed safely and easily, a viaduct, and a construction method. SOLUTION: U-shaped connecting bars 4 are appropriately spaced from one another and provided to project from one longitudinal side of a concrete panel 2 from which the tops of truss bars 3 project. Bent bars 5 are provided on the upper surface of a stepped joint portion 9 projecting from the other side of the concrete panel 2, with the ends of the bent bars 5 held upright.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete floor plate for viaducts, viaducts, and a method for constructing the viaducts.

[0002]

2. Description of the Related Art Viaducts such as road bridges are shown in FIG.
And (2) as shown in FIG.
In addition, a so-called full precast concrete floor plate 26 is laid on a bridge girder and constructed.

[0003]

However, the viaduct of cast-in-place concrete requires a scaffold, a formwork and a shoring for the viaduct, and the construction is complicated and troublesome. On the other hand, a full precast concrete plate is heavy, so that it is difficult to transport and handle it on site, and there is a problem that a main reinforcing bar at a joint between the full precast concrete plates must be inserted from the side.

[0004] The present invention has been made in view of these problems, and an object of the present invention is to provide a precast concrete floor plate for viaducts having good durability, which can be constructed safely and easily,
An object of the present invention is to provide a vial and a method for constructing the same.

[0005]

According to a first aspect of the present invention, a U-turn connecting bar is provided on one side in the long side direction of a concrete plate from which an upper portion of a truss bar projects. Are provided at appropriate intervals, a bending line is provided on the upper surface of the joining step portion protruding from the other side of the concrete plate, and a tip portion of the bending line stands up. .

According to the first aspect of the present invention, when the precast concrete slab is laid on the bridge girder, the main reinforcing bar can be easily arranged in the connecting bar.

According to a second aspect of the present invention, in the first aspect, side plates are bent at both side portions in the short side direction of the concrete plate, and template plates are provided on the side plates via truss bars at appropriate intervals. It is characterized by the following.

According to the second aspect of the present invention, it is possible to construct a wall railing simply by pouring concrete in a gap between the side plate and the template.

According to a third aspect of the present invention, there is provided a concrete plate in which an upper portion of a truss is projected, side plates are formed on both sides in a short side direction of the concrete plate, and a template is provided on the side plate via a truss bar at appropriate intervals. The precast concrete slabs were laid on the bridge girder with the long sides facing each other, and concrete was cast on the upper surface of these precast concrete slabs and the gap between the side plates and the template. And

[0010] According to the third aspect of the present invention, a durable viaduct can be constructed by the precast concrete slab in which the truss bars are arranged.

According to a fourth aspect of the present invention, a U-turn connecting bar is protruded from one side of the long side of the concrete plate at an appropriate interval, and a connecting step on the other side is provided with a tip end. A plurality of precast concrete slabs with bent streaks are laid on the bridge girder, and connecting bars and bending bars are alternately arranged at the joints in the long side direction, and these connecting bars are folded. After arranging the main reinforcing bars in the connecting bars from the gaps formed between them and bending the tips of the bending bars to form loops with the connecting bars, concrete is placed on these precast concrete floor boards. Is characterized by being cast.

According to the fourth aspect of the present invention, it is possible to easily arrange the main reinforcing bars in the connecting bars, and to construct the wall railing by merely placing concrete in the gap between the side plate and the template. be able to.

According to a fifth aspect of the present invention, a side plate having a template is bent and formed on both sides in the short side direction of the concrete plate via a truss bar. U-shaped connecting bars are projected at appropriate intervals, and a plurality of precast concrete slabs are provided on the bridge girder. The connecting bars and the bending bars are arranged alternately at the joints in the long side direction of the joint, and the main reinforcing bars are arranged in the connecting bars from the gap between these connecting bars and the bending bars. The method is characterized in that, after forming the loop by the connecting bar by bending the tip, concrete is poured into the gap between the side plate and the template and the precast concrete floor plate.

According to the fifth aspect of the present invention, since the main reinforcing bars can be easily arranged in the connecting bars, the precast concrete slabs can be easily joined.

The invention of claim 6 is the invention of claim 4 or 5.
Here, the main reinforcing bars are arranged in advance in the connecting bars.

According to the sixth aspect of the present invention, the work of arranging the main reinforcing bars in the connecting bars can be omitted.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The precast concrete floor plate for viaduct, viaduct, and method for constructing the viaduct of the present invention will be described below. FIG. 1 is a plan view of a precast concrete floor panel of the first embodiment, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG.

The precast concrete floor plate 1 includes a concrete plate 2, four truss bars 3 arranged at appropriate intervals along the long side direction, and connecting bars 4 protruding from one side in the long side direction. And a bending line 5 protruding to the other side. The upper part of the truss line 3 protrudes from the upper surface of the concrete plate 2.

The truss bar 3 is a triangular truss in which one upper bar 6 and two lower bars 7 arranged in a triangular shape are joined by a lattice lattice 8 having a waveform. This is not limited to triangular truss,
A truss bar (not shown) in which one upper bar and one lower bar are joined by a lattice bar may be used.

A connecting bar 4 projecting from one side of the long side of the concrete plate 2 is bent and formed in a U-turn shape.
It is provided at a position shifted from the bending line 5. On the other hand, a joining step 9 projects from the other side in the long side direction of the concrete plate 2, and a bending line 5 protruding from the other side is arranged on the upper surface thereof, and the tip end thereof has an L-shape. It is bent.
The tip is bent at a right angle, but the bending angle is not limited as long as it is upright.
Further, the joining step 9 is formed to have irregularities in cross section, and the lower part of the bending line 5 is embedded in the projection 10. Also concrete plate 2
A positioning hole 11 through which a stud bolt of a bridge girder penetrates is opened at an appropriate position.

FIGS. 5 to 7 show a precast concrete floor plate 12 according to a second embodiment. Side plates 13 are bent upward at both ends of the concrete plate 2 in the short side direction. A template 15 is provided with a gap portion 16 through the intermediary of the precast concrete floor plate 1 of the first embodiment except that the side plate 13 is provided. Cast-in-place concrete is poured into a gap 16 between the side plate 13 and the template 15 to form a wall railing. In order to prevent the spliced portion between the cast concrete and the side plate 13 or the template 15 from leaking, an upper part of the side plate 13 and the template 15 is formed as shown in FIG. You can also.

Next, the viaduct using the above precast concrete floorboard will be described. FIG. 8 is a sectional view of a viaduct 17 using the precast concrete floor slab 12 of the second embodiment. The upper surface of the precast concrete floor slab 12 laid on the steel bridge girder 18 with the long sides facing each other, and Side plate 13 and template 1
Concrete 19 is poured into the gap 16 between the wall 5 and the wall 5 to form a wall rail 22, and the template 15 also serves as an inner frame. Further, since the side plate 13 and the template 15 are joined by the truss bars 14, the joining strength is increased. Further, one of the precast concrete slabs 12
As shown in FIGS. 9 and 10, the joining step 9a is abutted against the side of the other precast concrete floor plate 12b, and the connecting bars 4 projecting from the side are arranged on the joining step 9. Then, a loop 20 is formed with the bending line 5, and a main reinforcing bar 21 is arranged in the loop 20. Therefore,
The connecting bars 4, the bending bars 5, and the main reinforcing bars 21 are joined at both sides in the long side direction.

Next, the method for constructing the above-mentioned high crosslink is shown in FIGS.
This will be described with reference to FIG. First, as shown in FIG. 11, the precast concrete floor plates 12a and 12b are lifted by a crane, and stud bolts 2 are inserted into the positioning holes 11.
It is laid on the bridge girder 18 so that 3 enters. At this time, FIG.
As shown in (1), the main reinforcing bar 21 is already arranged inside the connecting bar 4, and the main reinforcing bar 21a on the bending bar 5 side is also temporarily disposed. Thus, the other precast concrete slab 1
2b is laid next to one of the pre-cast concrete slabs 12a that has already been installed.
Is arranged between the bending lines 5 of the joining step 9 of the one precast concrete floor panel 12a. In this state, the distal end of the bending bar 5 standing upward is bent in a U-turn shape to form a loop 20 with the connecting bar 4, and the main reinforcing bar 21 a temporarily installed on the connecting bar 4 is connected to the bending bar 5 side , The side portions in the long side direction are connected as shown in FIG. And the precast concrete slab 12 thus connected
When the cast-in-place concrete 19 is poured into the upper surfaces of the a and 12b and the gap 16 between the side plate 13 and the template 15, FIG.
The highly cross-linked 17 shown in FIG. When the distal end portion of the bending bar 5 is erected as described above, the main reinforcing bar 21 can be arranged in the connecting bar 4 in advance.
One bar arrangement can be omitted.

FIG. 13 shows precast concrete slabs 12a and 12 in which the main reinforcing bar 21 is not arranged in the connecting bar 4.
3B shows the connection of the precast concrete plate 1 even when the main reinforcing bar 21 is not
When the joints 2a and 12b are joined to each other, a gap 24 is formed between the bending bar 5 and the connecting bar 4 because the distal end of the bending bar 5 stands up. Is bent into a U-turn to form a loop 20.

The above-mentioned hypercrosslinking and its construction method are described in the second section.
Although the precast concrete floorboard 12 of the embodiment is used, when the precast concrete floorboard 1 of the first embodiment is used, only the construction of the wall rail 22 is different, and otherwise the same method as described above is used. Can be built with

[0026]

When the precast concrete slab is installed on the bridge girder, the main reinforcing bars can be easily arranged in the connecting bars.

A wall rail can be constructed simply by casting concrete in the gap between the side plate and the template.

Since the main reinforcing bars can be easily arranged in the connecting bars, the precast concrete floor plates can be easily joined to each other.

The durable viaduct can be constructed by the precast concrete slab having the truss bars arranged therein.

[Brief description of the drawings]

FIG. 1 is a plan view of a precast concrete floor panel according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIGS. 4 (1) and (2) are side views of a precast concrete floor panel.

FIG. 5 is a plan view of a precast concrete floor panel according to a second embodiment.

6A is a cross-sectional view taken along line CC of FIG. 5, and FIG. 6B is a cross-sectional view of a main part.

FIG. 7 is a sectional view taken along line DD of FIG. 5;

FIG. 8 is a sectional view of a viaduct.

FIG. 9 is a sectional view taken along line EE of FIG. 8;

10A is an enlarged cross-sectional view of a main part of FIG. 9, and FIG. 10B is a cross-sectional view taken along line FF of FIG.

FIG. 11 is a plan view in which a precast concrete floor panel is laid on a bridge girder.

FIGS. 12 (1) and (2) are explanatory views showing a method of joining precast concrete floorboards.

FIGS. 13 (1) to (3) are explanatory views showing another joining method of precast concrete floorboards.

FIGS. 14 (1) and (2) are a cross-sectional view and a perspective view showing a conventional method for constructing a viaduct.

[Explanation of symbols]

 1, 12, 26 Precast concrete floor plate 2 Concrete plate 3, 14 Truss bar 4 Connecting bar 5 Bending bar 6 Upper bar 7 Lower bar 8 Lattice bar 9 Joining step 10 Convex part 11 Positioning hole 13 Side plate 15 Template 16 Gap 17 Viaduct 18 Bridge girder 19,25 Concrete 20 Loop 21 Main reinforcement 22 Wall railing 23 Stud bolt 24 Clearance

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toumitsu Hinuma 3-15-7 Higashi, Shibuya-ku, Tokyo Japan Kaiser Co., Ltd. F-term (reference) 2D059 AA14 BB37 CC03 CC04 DD16 GG55

Claims (6)

[Claims] 1. A U-turn connecting bar is protruded at an appropriate interval on one side in the long side direction of a concrete plate from which an upper portion of a truss bar protrudes, and protrudes from the other side of the concrete plate. A precast concrete slab wherein a bent line is provided at the joining step portion, and a tip end of the bent line stands upright. 2. The concrete plate according to claim 1, wherein side plates are bent at both side portions in the short side direction of the concrete plate, and template plates are provided on the side plate via truss bars at appropriate intervals. Precast concrete floorboard for viaduct. 3. A precast concrete floor plate in which side plates are bent and formed on both sides in the short side direction of the concrete plate from which the upper portions of the truss bars protrude, and templates are provided on the side plates via truss bars at appropriate intervals. A viaduct, which is laid on a bridge girder with its long sides facing each other, and concrete is cast on the upper surface of these precast concrete slabs and the gap between the side plates and the template. 4. A U-turn connecting bar is protruded from one side of the concrete plate in the long side direction at appropriate intervals, and a bending bar having a standing end at the joining step on the other side. A plurality of precast concrete slabs provided with bridges are laid on the bridge girder, and connecting bars and bending bars are alternately arranged at the joints in the long side direction, and between these connecting bars and bending bars. After arranging the main reinforcing bar in the connecting bar from the formed gap and bending the tip of the bending bar to form a loop with the connecting bar,
A method for constructing a viaduct, which comprises placing concrete on these precast concrete floorboards. 5. A side plate provided with a template is formed on both sides in the short side direction of the concrete plate via truss bars, and a U-turn connection is made to one side in the long side direction of the concrete plate. A plurality of precast concrete slabs are provided on the bridge girder, with reinforcing bars protruding at appropriate intervals and a bent bar with an upstanding tip at the joining step on the other side. The connecting bars and the bending bars are arranged alternately in the section, and the main reinforcing bars are arranged in the connecting bars from the gaps between these connecting bars and the bending bars, and the tips of the bending bars are bent and connected. A method for constructing a viaduct, comprising: after forming a loop by a streak, placing concrete on a gap between a side plate and a template and on a precast concrete floor plate. 6. The method for constructing a viaduct according to claim 4, wherein the main reinforcing bars are arranged in advance in the connecting bars.