JP3176309B2 - Precast concrete slab for bridge structure and joining method thereof - Google Patents

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 floor slab for a bridge structure, wherein an upper portion of a truss bar is projected from the concrete slab.
Lining on both sides in the short side direction of precast concrete
Are integrally formed, and the length of the precast concrete plate is
Hooks curved upward on both sides in the side direction are properly spaced
Each hook protrudes, and one hook streak is
The lower part of the hook muscle with a large curved diameter and a large curved diameter
Is buried in the mounting part on the long side of the precast concrete plate.
And a concave portion is formed between the hook streaks of the mounting portion . The method of joining pre-cast concrete floor for bridge structures, trusses muscle protrudes from the upper surface
Precast concrete floor slab
Lay them side by side on the bridge girder and project from these sides
Hooks with different curved diameters
Loop, and the loop has hook muscles with different curved diameters.
A gap for the rebar insertion is formed, and a loop is formed from the gap.
After arranging the main reinforcing bars in the
Is characterized by being cast .

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

FIG. 8 is a sectional view taken along line DD of FIG . 5;

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

Continued on the front page (72) Inventor Hiroshi Okamoto 5472 Kimagase, Sekijuku-machi, Higashi-Katsushika-gun, Chiba Prefecture Inside the Technical Research Laboratory (72) Inventor Masato Mutoh 5472 Kimagase, Sekijuku-cho, Higashi-Katsushika-gun, Chiba Prefecture Tobishima Construction Co., Ltd. Inside the 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, Shibuya-ku, Tokyo Japan Kaiser Co., Ltd. (72) Inventor Katsutoshi Kimura 3-15-7 Higashi, Shibuya-ku, Tokyo Japan Kaiser Co., Ltd. (56) References JP-A-8-20915 (JP, A) JP-A-3-84327 (JP, U.S.A.) (58) Fields surveyed (Int. Cl. ⁷ , DB name) E01D 19/12 E01D 21/00

Claims (4)

(57) [Claims] The upper part of the truss bar projects from a concrete plate.
Both sides in the short side direction of the released precast concrete plate
The ground cover is integrally formed on the precast concrete
An upwardly curved hook streak is suitable for both sides in the long side direction of the board.
The hooks are projected at regular intervals, and one hook
Hook muscle that has a larger bending diameter than the muscle and a larger bending diameter
Is placed on the long side of the precast concrete plate
Recesses are formed between the hook streaks of the mounting portion.
Precast concrete slab for bridge structures, characterized in that it has been removed. 2. A truss bar is a single truss bar arranged in a triangular shape.
The precast concrete floor plate for a bridge structure according to claim 1, wherein the upper end bar and the two lower bar bars are connected by a corrugated lattice bar . 3. The truss bar includes a top bar and a bottom bar.
The precast concrete slab for a bridge structure according to claim 1, wherein the slabs are connected by a corrugated lattice bar . 4. A cascade with truss bars projecting from the upper surface.
Concrete floorboards with the long sides facing each other
Lay them on a bridge girder, and project
Hook streaks overlap in the direction of the bridge girder to form a loop
However, a reinforcing bar is inserted into the loop using hook bars with different curved diameters.
An input gap is formed, and the main iron is inserted into the loop from the gap.
A method for joining precast concrete floorboards for a bridge structure , wherein topping concrete is cast after reinforcing bars are arranged .