JP3026058B2 - PC composite floor slab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a precast concrete composite slab using a precast concrete slab, and more particularly to a structure of a PC composite slab suitable for constructing a road surface such as a bridge.

[0002]

2. Description of the Related Art Generally, when constructing a bridge or the like, when constructing a road surface, a formwork is provided, a reinforcing bar is placed in the formwork, and then concrete is poured so as to surround the reinforcing bar. Have been. However, according to such a construction method, there are many on-site work such as installation and removal of a formwork, so that not only the construction period becomes long but also dangerous work, and also there are many problems such as obstructing traffic in some cases.

[0003] Due to such a problem of workability, recently, a precast concrete slab (hereinafter referred to as a PC slab) having a size that can be transported at a factory is manufactured, and the PC slab is transported to the site to set up a stud dowel. It has been proposed that a PC composite floor slab is placed on a main girder, and the PC slab is used as a formwork, a reinforcing bar is assembled thereon, and concrete is cast.

[0004]

However, in the conventional PC composite floor slab, since the surface of the PC slab is formed as a flat surface, the PC slab is not sufficiently adapted to concrete cast on the surface. In addition, there is a problem that the size cannot be increased. That is, when concrete is cast on the flat PC slab manufactured at the factory to form a PC composite floor slab, the adhesive force between the PC slab and the concrete layer is extremely weak, and thus tends to be a weak point. As a result, not only does the strength decrease, but also the PC plate having this surface formed into a flat surface has a large weight, so that it cannot be produced with a large size, that is, a relatively large area due to transportation problems.

In order to reduce the weight, it is conceivable to reduce the thickness of the PC plate. However, in this case, since the strength is insufficient, construction equipment such as a traveling crane is used when placed on a girder. In such a case, there was a problem that it would cause trouble.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is provided at predetermined intervals.
It is provided vertically and horizontally along multiple main bars arranged in parallel
Lattice-shaped protrusions and an opening from the bottom provided between the protrusions
A PC plate is formed on the surface of which an uneven fitting portion consisting of a groove-shaped concave portion having parallel wall surfaces is formed, and a reinforcing bar is arranged on the PC plate , and concrete is cast using the reinforcing bar as a reinforcing member. It is an integrated PC composite slab .

The recess has a wide wall surface and a wide bottom.
The opening side may be formed as a reduced inclined surface to form a dovetail fitting state with concrete .

[0008]

[Work] An irregular fitting portion is formed on the surface of a PC floor slab, and a concrete layer formed thereon is relatively large and strong because the concrete layer enters and adheres to the irregular fitting portion.
Synthetic slabs can be formed.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the structure of a PC composite floor slab according to the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view of a PC composite slab laid on a bridge, in which a PC composite slab 2 is laid on a main girder 1 arranged in a road direction. The PC composite floor slab 2 has a composite laminate structure composed of a PC slab 3 having an uneven fitting portion on the upper surface and concrete 4 cast on the upper surface thereof, and asphalt 5 is laid on the concrete 4. The road 6 is formed. Although the concrete 4 does not enter the concave / convex fitting portion of the PC plate 3 for convenience of the drawing, a part of the concrete flows into the concave / convex fitting portion to actually function as an anchor.

More specifically, as shown in FIG. 2, the PC plate 3 has a concave-convex fitting portion K in which a rectangular concave portion 7 and a lattice-shaped convex portion 8 are arranged in parallel on the surface thereof. A PC steel wire 9 is provided therein to apply tension and introduce prestress into the floor slab. A plurality of sleeves 10 are embedded in the projection 8 in the transverse direction, and a PC steel wire 11 is penetrated into the sleeve 10 to apply a prestress.

The PC plate 3 constructed as described above is manufactured in a factory having a good working environment, transported to the site, and
Main girder 1 that is arranged in the road direction in advance as shown in
Place on top. In this case, the concave portion 7 and the convex portion 8 forming the concave-convex fitting portion K are arranged in the bridge axis direction and the direction orthogonal thereto. When the concave / convex fitting portion K is constituted by parallel convex portions,
This projection is arranged to be orthogonal to the bridge axis.

The PC plate 3 is disposed on the spar 12 in the direction of the bridge axis or a plurality thereof, and the PC steel wire 11 is inserted into the sleeve 10 and tightened to a predetermined tension. Raised to give strong post tension. When the arrangement of the PC plate 3 is completed in this way, as shown in FIG.
Are arranged vertically and horizontally in a mesh pattern, and concrete 4 is cast as shown in FIG.

FIGS. 7 to 9 show a PC composite floor slab 2A having another structure.
FIG. 3 is a plan view and a side sectional view showing a PC plate 3 on a main girder 1.
A is arranged, the reinforcing bars 13 and 14 are arranged vertically and horizontally on the uneven fitting portion K on the upper surface thereof, and the reinforcing bars 13 and 14 (FIG. 7) are filled to fill the uneven fitting portion K. The PC composite floor slab 2A is formed by casting concrete 4.

As shown in FIG. 10, the PC floor slab 3A has a rectangular recess 7a, and a lattice or mesh portion surrounding the recess 7a is a projection 8a. In addition, 15 is a tension steel wire (PC steel wire) arranged in the bridge axis direction, 16 is a post tension steel wire (PC steel wire) arranged in the bridge axis direction, and 17 is a planting on the flange surface on the main girder 1. An upright stud dove, 18 is a block joint for connecting the PC plates 3A, and 19 is a drainage device.

FIG. 10 shows details of the portion [a] in FIG. 7, and FIG. 11 is a sectional view taken along the line C--C in FIG.
2 is a sectional view taken along line DD of FIG. 10, and FIG. 13 is a sectional view taken along line EE of FIG.
Line sectional views are respectively shown. 12 and 13, the part of the block joint 18 is the PC steel wire 1 through the joint hardware.
6 is a portion where post tension is applied to the PC steel wire 16 by a pulling device such as a jack or the like, and concrete 21 is poured into the steel wire 16 so as to match the surface of the concrete 4 and connected.

FIG. 14 shows details of the portion [b] in FIG. 7, and FIG. 15 is a sectional view taken along line FF of FIG.
6 is a sectional view taken along line GG of FIG. In the figure, reference numeral 22 denotes post-cast concrete that fills the space where the stud dowel 17 planted on the main girder 1 is arranged. FIG. 17 shows a cross section of the concave / convex fitting portion K formed by the concave portion 7a and the convex portion 8a. The concave portion 7a is formed by a tapered wall surface having a narrow opening side to improve the connection with concrete. ing.

The concave portion 7 of the concave / convex fitting portion K formed on the upper surface of the PC plate constituting the PC composite floor slab of the present invention has a longitudinal direction (perpendicular to the main girder) as shown in FIGS. 7), and a structure in which the concave portions 7a are formed in a mesh pattern as shown in FIGS. In addition, the cross-sectional shape of the wall surfaces of the recesses 7 and 7a may be parallel to the bottom to the opening or may be parallel to the bottom.
One having a narrow opening can be used. In short, concrete layer 4 is formed on PC
When the C composite floor slabs 2 and 2A are formed, any material may be used as long as these composite layers have a function of being integrally bonded.

[0018]

As apparent from the above description, according to the invention, Oite the present invention <br/> is a plurality of which is arranged parallel to a predetermined interval main reinforcement
The grid-shaped projections are provided vertically and horizontally along
A strong PC plate can be formed. Next, a groove-shaped
Since the recess is provided, a lightweight PC version can be used even if it is large.
can get. As a result, when erection of PC version
The machine can run and the construction work can be streamlined.
The construction period can be shortened and the construction cost can be reduced.
There is also an effect. Also, the concrete poured in
Enters a groove-shaped recess with parallel wall surfaces from the opening to the opening
The adhesive strength between the cast concrete and the PC plate is strong.
And a strong synthetic slab can be formed. In addition, the wall has an opening
Is a recess formed as a reduced slope
The bond between the cleat and the PC plate can be further strengthened.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a bridge using a PC composite slab according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an uneven fitting portion of the PC plate.

FIG. 3 is a cross-sectional view in the bridge axis direction showing a bridge construction procedure.

FIG. 4 is a cross-sectional view in the bridge axis direction in which a PC plate is arranged on a main girder.

FIG. 5 is a cross-sectional view showing a state where reinforcing bars are arranged on a PC plate.

FIG. 6 is a cross-sectional view showing a state where a concrete layer is formed on the PC plate of FIG.

FIG. 7 is a plan view of a PC plate according to another embodiment.

FIG. 8 is a sectional view taken along line BB in FIG. 7;

FIG. 9 is a sectional view taken along line AA in FIG. 7;

FIG. 10 is a detailed view of a portion [a] in FIG. 7;

11 is a sectional view taken along line CC in FIG.

FIG. 12 is a sectional view taken along line DD in FIG. 10;

FIG. 13 is a sectional view taken along line EE in FIG. 10;

FIG. 14 is a detailed view of a portion [b] in FIG. 7;

FIG. 15 is a sectional view taken along line FF in FIG. 14;

FIG. 16 is a sectional view taken along line GG in FIG.

FIG. 17 is a cross-sectional view of an uneven fitting portion.

[Explanation of symbols]

1,12 digits 5 Asphalt 2 PC composite floor slab 6 Road 3 PC version 7 Concave part 4 Concrete 8 Convex part 9 PC steel wire 10 Sleeve 11 PC steel wire 13,14
Rebar

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Tanaka 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Nobuki 5-6-4 Tsukiji Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Incorporated (56) References Real Open Sho 61-202512 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E01D 19/12

Claims (2)

(57) [Claims] 1. A plurality of main units arranged in parallel at predetermined intervals.
A lattice-shaped projection provided vertically and horizontally along the streaks, and this projection
A groove between the bottom and the opening with parallel walls from the opening
Recess and PC version of the concave and convex engaging portions configured on the surface consisting of the
Formed, the rebar is placed on the PC version, PC synthesis slab was Da設concrete the reinforcing steel as a reinforcing member. 2. A wall of a concave portion having an inclined surface with a reduced opening.
PC synthesis slab according to claim 1, wherein are formed by.