JPH10252015A - Precast concrete floor board for bridge structure and its jointing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and efficiently joint precast concrete floor boards and construct a bridge by integrally forming bottom covers on both sides in the short side direction of the precast concrete board protruded with the upper sections of truss bars from the concrete board. SOLUTION: This precast concrete floor board is constituted of a concrete board 2, truss bars 3 arranged at proper intervals along the long side direction, and bottom covers 4 integrally formed on both sides in the short side direction, and the upper sections of the truss bars 3 are protruded from the upper face of the concrete board 2. One upper end bar 5 and two lower end bars 6 arranged into a triangular shape are connected by corrugated lattice bars 7 to form a triangular truss for this truss bar 3. Hook bars 8 (small-diameter hook bars 8a and large-diameter hook bars 8b) curved upward are protruded at proper intervals at staggered positions on both side faces in the long side direction of the concrete board 2. The formation of the bottom covers with precast concrete or cast-in-place concrete at the site can be omitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete slab for a bridge structure and a joining method thereof.

[0002]

2. Description of the Related Art Precast concrete floorboards are often used for bridges such as road bridges. In this construction method, as shown in (1) of FIG.
After the so-called full precast concrete floor boards 22 are laid and joined, a ground covering 23 made of precast or cast-in-place concrete is formed on both sides in the short side direction. In addition, full precast concrete slab 22
As shown in (2) of the figure, in the joining method of (1), the side loop bars 24 are overlapped in the bridge girder direction, and the main reinforcing bars 25 are inserted from the ends in the bridge girder direction and arranged.

[0003]

However, such a bridge is troublesome because the ground covering is made of precast or cast-in-place concrete after laying precast concrete floorboards. Also, for precast concrete floor slab joining, the loop bars were overlapped in the direction of the bridge girder, and the main reinforcement was inserted in the direction of the bridge girder, resulting in poor work efficiency.

The present invention has been made in view of these problems, and an object of the present invention is to easily and efficiently join precast concrete slabs and construct bridges.

[0005]

According to the present invention, there is provided a precast concrete slab for a bridge structure according to the present invention, wherein upper portions of truss bars are provided on both sides in a short side direction of the precast concrete slab protruding from the concrete slab. And a ground cover is integrally formed. In addition, the method of joining precast concrete slabs for bridge structures is such that precast concrete slabs with truss bars projecting from the top surface are laid on a bridge girder with the long sides facing each other, and the curved diameters projecting from these sides differ. The hook bars are overlapped in the direction of the bridge girder to form a loop, a gap is formed in the loop for reinforcing bar insertion by hook bars having different curved diameters, and after arranging a main reinforcing bar in the loop from the gap, It features topping concrete.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a precast concrete slab for a bridge structure and a joining method thereof according to the present invention will be described. 1 is a plan view of a precast concrete floor panel, 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 panel 1 is composed of a concrete panel 2, four truss bars 3 arranged at appropriate intervals along the long side direction, and a ground covering 4 integrally formed on both sides in the short side direction. The upper part of the truss bar 3 is projected from the upper surface of the concrete plate 2.

The truss bar 3 is a triangular truss in which one upper bar 5 and two lower bars 6 arranged in a triangular shape are joined by a lattice lattice 7 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.

On the other hand, upwardly curved hook streaks 8 protrude at appropriate intervals from both sides in the long side direction of the concrete plate 2, and the positions of one side and the other side are shifted from each other. These hook streaks 8 are a small-diameter hook streaks 8a and a large-diameter hook streaks 8b having different curved diameters. One side has the small-diameter hook streaks 8a, and the other side has the large-diameter hook streaks 8b. Are protruding respectively. The lower part of the large-diameter hook streaks 8b is buried in the mounting portion 11, and the mounting portion 11 has a recess 12 formed therein. The mounting portion 11 is formed to have a concave and convex section, and the lower portion of the large-diameter hook streaks 8b is embedded in the convex portion 13 to maintain a certain strength. Also, a positioning hole 14 is formed at an appropriate place of the concrete plate 2 so that a stud bolt of a bridge girder can penetrate there.

Next, a method of joining the precast concrete slab 1 as described above will be described based on the construction of a bridge. FIG. 4 shows precast concrete floor boards 1 laid on three I-shaped steel girders 16 with their long sides facing each other. Small-diameter hook bars 8a of one precast concrete floor board 1 The other precast concrete slab 1 is placed in the concave portion 12 of the placing portion 11. Therefore, the hook streaks 8a and the large-diameter hook streaks 8b alternately overlap in the steel girder direction to form the loop 9. Since the hook streaks 8 of the loop 9 have a small diameter and a large diameter, a gap 10 for inserting a reinforcing bar is formed at an upper portion thereof.

Next, two main reinforcing bars 17 are inserted and arranged in the loop 9 from the gap 10, and two main reinforcing bars 17 are also arranged in the gap 10. These main reinforcing bars 17 can be inserted into the loop 9 from the side and arranged. Stud bolts 15 of steel girders 16 penetrate into the positioning holes 14 of the concrete plate 2 to prevent the precast concrete floor plate 1 from shifting.

In this manner, the precast concrete slabs 1 are laid and the main reinforcing bars 17 are arranged laterally on the loops 9 formed on the side surfaces. Then, topping concrete (not shown) is cast on the precast concrete floorboard 1 and a railing (not shown) is attached on the ground cover 4 to complete the construction of the bridge. The precast concrete slab 1 in which the ground cover 4 is integrally formed as described above.
By using, the construction of the ground cover 4 can be omitted and the main reinforcing bar 17 can also be arranged in the lateral direction, so that the bridge can be constructed efficiently.

[0013]

According to the present invention, the ground covering is integrally formed on both sides in the short side direction of the precast concrete floor plate in which the upper part of the truss bar projects from the upper surface of the concrete plate, so-called half PC floor plate. The formation of the ground cover can be omitted.

Since the ground cover is formed integrally with the so-called half PC, it can be transported without any problem in terms of weight.

[0015] The small diameter hook streaks and the large diameter hook streaks having different curved diameters are alternately overlapped in the long side direction to form a loop, and a gap for reinforcing bar insertion is formed on the upper portion of the loop. The main reinforcement can be inserted into the loop from the gap to arrange the reinforcement.

[0016] The bridge can be constructed efficiently because a precast concrete slab with an integrated ground cover is used and the main reinforcing bars can be arranged in the loop from the lateral direction.

[Brief description of the drawings]

FIG. 1 is a plan view of a precast concrete floor panel.

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 portion of a precast concrete slab.

FIG. 5 is a plan view in which precast concrete floorboards are arranged on a bridge girder.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

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

8 (1) is an enlarged sectional view of a joint, and FIG. 8 (2) is (1).
FIG. 7 is a sectional view taken along line EE of FIG.

FIG. 9 (1) is a perspective view showing a method for constructing a bridge using a conventional precast concrete floorboard, and (2) is a cross-sectional view of a conventional method for joining a precast concrete floorboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast concrete floor board 2 Concrete board 3 Truss bar 4 Ground cover 5 Upper bar 6 Lower bar 7 Lattice bar 8 Hook bar 9 Loop 10 Gap part 11 Flange part 12 Concave part 13 Convex part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Okamoto 5472 Kimagase, Sekijuku-cho, Higashi-Katsushika-gun, Chiba Prefecture Tobishima Construction Co., Ltd. Within the Technical Research Institute (72) Inventor Shinichiro Sato 3-15-7 Higashi, Shibuya-ku, Tokyo Japan Kaiser Co., Ltd. (72) Inventor Masayoshi Naito 3-15-7 Higashi, Higashi-shibu, Tokyo Japan Kaiser Co., Ltd. (72) Katsura Kimura, Inventor Kaiser Co., Ltd., 3-15-7 Higashi, Shibuya-ku, Tokyo

Claims (5)

[Claims] 1. A precast concrete floor plate for a bridge structure, wherein an upper part of a truss bar is integrally formed on both sides in a short side direction of the precast concrete plate protruding from the concrete plate. 2. A hook bar curved upward is protruded at appropriate intervals on both side surfaces of the precast concrete plate in a long side direction, and a curved diameter of one hook bar is larger than that of the other hook bar, and The lower part of a hook streak having a large curved diameter is buried in a mounting portion on a side surface in the long side direction of the precast concrete plate, and a concave portion is formed between the hook streaks of the mounting portion. A precast concrete slab for a bridge structure according to claim 1. 3. The truss bar according to claim 1, wherein one upper bar bar and two lower bar bars arranged in a triangular shape are connected by a wavy lattice bar. Precast concrete slabs for bridge structures in Thailand. 4. The precast for a bridge structure according to claim 1, wherein each of the truss bars has one upper and lower bars connected by a wavy lattice bar. Concrete floorboard. 5. A precast concrete slab having a truss bar projecting from an upper surface thereof is laid on a bridge girder with its long sides facing each other, and hook bars having different curved diameters projecting from these sides are superposed in the bridge girder direction. A loop is formed, and a gap portion for reinforcing bar insertion is formed in the loop by hook bars having different curved diameters. After the main reinforcing bar is reinforced in the loop from the gap portion, topping concrete is poured. Method of joining precast concrete floor slabs for bridge structures.