JP2000038710A - Structure of concrete floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain increase of cost and weight and to easily construct a floor slab of high strength. SOLUTION: A precast floor slab 1 to constitute a concrete floor slab is constituted of a concrete part 2 formed of concrete and skin plates 3 respectively provided on a surface and a back of the concrete part 2. A steel plate 4 is provided in the circumference of the precast floor slab 1, and a box body 5 is formed of the steel plate 4 and the skin plates 3. The concrete part 2 is made by filling concrete C in the box body 5. Connecting reinforcements 6 for connection with another precast floor slab 1 are provided in the circumference of the precast floor slab 1. The precast floor slab 1 are laid on a bridge girder, and the precast floor slab 1 are connected to each other by setting forworks below between these precast floor slab 1 and depositing concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete slab for constructing an elevated road such as an expressway.

[0002]

2. Description of the Related Art Conventionally, floor slabs constituting elevated roads such as expressways have been constructed by casting concrete on site or precast slabs have been manufactured in advance at factories.
This precast floor slab was laid out. By the way, since a large dynamic load is applied to the floor slab as the vehicle travels, a large number of reinforcing bars are arranged inside to secure the strength.

[0003]

In recent years, there has been a demand for further increasing the strength of the floor slab in consideration of earthquake resistance and the like. There has been a problem that the thickness has to be increased, and not only the weight of the floor slab is increased, but also the cost is greatly increased.

The present invention has been made in view of the above circumstances, and provides a structure of a concrete slab capable of easily constructing a high-strength slab in which enormous cost increase and weight increase are suppressed. It is intended to be.

[0005]

In order to achieve the above object, a concrete slab structure according to claim 1 is a structure of a concrete slab to be a road surface such as an elevated road, the concrete slab being formed from concrete. And a skin plate made of a steel plate integrally provided on the front and back of the concrete part. In other words, since skin plates are provided on the front and back and these skin plates and the concrete part are integrated,
High strength can be achieved without increasing the thickness.

[0006] The structure of the concrete slab according to claim 2 is the same as the structure of the concrete slab according to claim 1,
Concrete is filled in a box formed by the skin plate and a steel plate provided around the skin plate to form a concrete portion. Thus, since it has the box formed by the skin plate and the surrounding steel plate, the rigidity is increased, and the concrete portion can be easily formed by filling the box with concrete. It becomes possible.

According to a third aspect of the present invention, there is provided a concrete floor slab structure for a road surface such as an elevated road, wherein the concrete slab is formed of concrete.
It is characterized by comprising a skin plate made of a steel plate provided integrally on the surface of the concrete part, and a reinforcing bar provided in the concrete part. That is, since the skin plate provided on the surface and the concrete portion are integrated and the reinforcing bar is provided in the concrete portion, high strength can be achieved without increasing the thickness.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a concrete slab according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a precast slab constituting the slab. The precast floor slab 1 includes a concrete portion 2 made of concrete and skin plates 3 provided on the front and back of the concrete portion 2 respectively.

The precast floor slab 1 is provided with a steel plate 4 around it, and a box 5 is formed by the steel plate 4 and the skin plate 3. The box 5 is filled with concrete C. Thus, the concrete portion 2 is formed. The precast slab 1 has connecting bars 6 around its periphery for connection to another precast slab 1.
Is provided. These connecting bars 6 are arranged inside the concrete portion 2 along the skin plate 3, and both ends of the connecting bars 6 are respectively connected to the surrounding steel plates 4.
It is projected from.

When a road surface such as an elevated road is constructed by the precast slab 1 having the above structure, the precast slabs 1 are laid on a bridge girder, and a formwork is provided below between the precast slabs 1. Then, concrete may be cast between the precast slabs 1 to connect the precast slabs 1 to each other.

As described above, according to the precast floor slab 1, the skin plates 3 are provided on the front and back, and the skin plates 3 and the concrete portion 2 are integrated, so that the main reinforcing bars, the distribution bars and the like are simply provided. The strength can be greatly improved as compared with a concrete slab having a structure in which reinforcing bars are provided. That is, since the strength can be increased without increasing the thickness of the floor slab, a floor slab excellent in earthquake resistance can be obtained without increasing the weight or increasing the cost. In addition, since it has the box 5 formed by the skin plate 3 and the surrounding steel plate 4, the rigidity can be increased, and by filling the box 5 with the concrete C, The concrete portion 2 of the precast slab 1 can be easily formed.

In the above example, the precast floor slab 1 previously filled with the concrete C in the box 5 formed by the skin plate 3 and the steel plate 4 has been described, but after laying on a bridge girder. Alternatively, the concrete C may be filled in the box 5 at the site. As the concrete C to be filled into the box 5, high-fluid concrete is preferable.

FIG. 3 shows a precast floor composed of skin plates 3 connected in parallel to each other by a connecting plate 7 and a concrete portion 2 made of concrete cast between the skin plates 3. It is version 1. Also in this case, a plurality of connecting bars 6 are provided along the skin plate 3, and both ends of the connecting bars 6 protrude from the surroundings.

When a road surface such as an elevated road is constructed with the precast slab 1 having this structure, the precast slabs 1 are laid on a bridge girder, and a formwork is provided below the space between the precast slabs 1. Then, concrete may be cast between the precast slabs 1 to connect the precast slabs 1 to each other.

[0015] Also in this case, the concrete C of the concrete part 2 may be filled on site. That is, the precast slab 1 in the state where the concrete C of the concrete portion 2 is not filled is laid on the bridge girder, and a formwork is installed below the space between the precast slabs 1. Concrete C is cast on the frame and between the skin plates 3.

Also in the case of the precast slab 1, the skin plates 3 are provided on the front and back, and the skin plate 3 and the concrete portion 2 are integrated, so that the thickness of the slab is not increased. It is possible to obtain a floor slab excellent in earthquake resistance without increasing strength and without increasing weight and cost.

Next, a concrete slab of another embodiment will be described. In FIG. 4, reference numeral 11 denotes a precast slab, and a concrete slab is constructed by laying the precast slab. The precast floor slab 11 is composed of a skin plate 3 provided on the front side, a concrete portion 2 provided below the skin plate 3, and a reinforcing bar 12 disposed in the concrete portion 2 on the back side. It is configured. A plurality of dowels 13 made of steel pipe or the like are welded and fixed to the surface of the skin plate 3 on the concrete part 2 side, and the skin plate 3 is surely integrated with the concrete part 2 by these dowels 13.

The reinforcing bar 12 is composed of a plurality of main bars 14 and a distribution bar 15 arranged in a direction perpendicular to the main bars 14. The ends of the main bars 14 and the distribution bars 15 constituting the reinforcing bar 12 project from the surroundings. In the precast floor slab 11, connecting bars 6 are provided on the concrete portion 2 near the skin plate 3, and both ends of the connecting bars 6 also protrude from the surroundings.

Then, the precast floor slab 11 having the above structure is used.
Also when constructing a road surface such as an elevated road, the precast floor slab 11 having the above structure is laid on the bridge girder,
A formwork may be installed below these precast slabs 11 and concrete may be cast between these precast slabs 11 to connect the precast slabs 11 to each other.

When the precast floor slab 11 having the above structure is manufactured, the concrete portion 2 of the skin plate 3 is used.
With this side plate facing upward, this skin plate 3
A concrete form may be installed around the periphery and concrete C may be cast inside. At this time, as a support structure of the reinforcing bar 12, as shown in FIG. 5, it is fixed to a supporting member 16 such as a U-shaped hook bolt screwed to the skin plate 3 or a threaded bar by welding or the like, or Skin plate 3
Is fixed by welding or the like to a support member 17 made of a hoop or the like welded and fixed to the support member 17.

According to the precast floor slab 11, the skin plate 3 provided on the front surface and the concrete portion 2 are integrated, and the reinforcing bar 12 is disposed in the concrete portion 2 on the back surface side. Therefore, the strength can be greatly improved as compared with a concrete slab having a structure in which reinforcing bars such as a main reinforcing bar and a distribution bar are arranged, thereby making it possible to increase the thickness of the slab. It is possible to obtain a floor slab excellent in earthquake resistance without increasing strength and without increasing weight and cost.

[0022]

As described above, according to the structure of the concrete slab of the present invention, the following effects can be obtained. According to the structure of the concrete floor slab according to the first aspect, since the skin plates are provided on the front and back and the skin plate and the concrete portion are integrated, the reinforcing bars such as the main bars and the distribution bars are simply provided. The strength can be greatly improved as compared with a concrete slab having a structured structure. That is, since the strength can be increased without increasing the thickness of the floor slab, a floor slab excellent in earthquake resistance can be obtained without increasing the weight or increasing the cost.

According to the structure of the concrete floor slab according to the second aspect, since the concrete slab has the box formed by the skin plate and the surrounding steel plate, the rigidity can be increased and the concrete is inserted into the box. By filling the concrete, the concrete portion of the concrete floor slab can be formed very easily.

According to the structure of the concrete floor slab according to the third aspect, the skin plate provided on the surface and the concrete portion are integrated, and the reinforcing bar is disposed in the concrete portion. Compared to a concrete slab with a structure in which reinforcing bars such as main bars and distribution bars are arranged, the strength can be significantly improved, thereby increasing the strength without increasing the thickness of the slab. Thus, a floor slab excellent in earthquake resistance can be obtained without increasing weight and cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a precast slab constituting a concrete slab, illustrating a configuration and a structure of a concrete slab according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a precast slab used for the concrete slab of the embodiment of the present invention.

FIG. 3 is a cross-sectional view of another precast slab used for the concrete slab of the embodiment of the present invention.

FIG. 4 is a sectional view of a precast slab used for a concrete slab according to another embodiment of the present invention.

FIG. 5 is a side view of a reinforcing bar supported by a skin plate for explaining a supporting structure of a reinforcing bar constituting a precast slab used in a concrete slab according to another embodiment of the present invention.

FIG. 6 is a side view of a reinforcing bar supported by a skin plate for explaining a supporting structure of a reinforcing bar constituting a precast slab used for a concrete slab according to another embodiment of the present invention.

[Explanation of symbols]

 2 Concrete part 3 Skin plate 4 Steel plate 5 Box body 12 Reinforcement C Concrete

Claims (3)

[Claims] 1. A concrete floor slab structure to be a road surface such as an elevated road, comprising: a concrete portion formed of concrete; and a skin plate made of a steel plate integrally provided on both sides of the concrete portion. The structure of a concrete floor slab, characterized in that: 2. The concrete floor slab according to claim 1, wherein a concrete portion is formed by filling concrete inside a box formed by the skin plate and a steel plate provided around the skin plate. Structure. 3. A concrete floor slab structure to be a road surface such as an elevated road, comprising: a concrete portion formed of concrete; a skin plate made of a steel plate integrally provided on a surface of the concrete portion; A structure of a concrete floor slab characterized by being provided with reinforcing bars arranged.