JPH0230492Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the improvement of deck slabs that are often used to form road surfaces for elevated bridges and the like.

Conventionally, this type of floor slab is of the cast-in-place type, in which formwork is assembled on-site and concrete is placed with reinforcing bars, and panels with reinforcing and thin steel plate formwork are produced in a factory. A semi-prefabricated type that requires only panel laying and concrete pouring, and a so-called precast slab that is made by placing reinforcement on thick steel plates that serve as the bottom formwork and strength members and pouring concrete, are manufactured in factories. It is broadly classified into a synthetic precast type that requires only the laying of precast slabs and the pouring of concrete into the joints.

However, each of these types has the following problems.

First, the cast-in-place type requires scaffolding, shoring, and formwork, so it is less safe and workable, takes a lot of time to construct, and requires thicker slabs.

Furthermore, in the case of the semi-prefabricated type, the panels have a structure as shown in FIG. That is, panel 1 shown in FIG.
In this case, the concrete 4 is partitioned by the I-beam 3 installed on the steel plate 2, and this concrete partition is likely to cause cracks, and since the I-beam 3 has high rigidity, it is difficult to attach it to the girder. Become. Also, in the panel 5 shown in FIG.
A problem similar to that of panel 1 described above occurs.

Furthermore, in the case of the synthetic precast type, it is difficult to attach it to the girder, and for example, in the precast deck slab 10 having the structure shown in Fig. 2A, the steel pipe dowel 12 protruding from the steel plate 11 is difficult to attach to the girder. There is a problem to be solved that the composition between the 12 is small. Further, for example, in the precast floor slab 13 having the structure shown in FIG.

The present invention was proposed in view of the above-mentioned circumstances, and its purpose is to provide a plurality of chevron-shaped plates in parallel on a thick steel plate that will serve as the bottom formwork and strength member, and to By attaching main reinforcing bars and distribution reinforcing bars, steel plates can be used as formwork and strength members for the deck slab, saving materials and improving durability. The objective is to provide a composite floor slab that can be easily installed on top.

Hereinafter, the present invention will be explained based on an embodiment shown in the attached FIGS. 3 to 6.

In the figure, reference numeral 20 denotes a composite deck slab according to the present invention, and this composite deck slab 20 includes a thick steel plate 21 that serves as a bottom formwork and a strength member, and a thick steel plate 21 that extends in the longitudinal direction of this steel plate 21 and extends in the other direction. A plurality of chevron-shaped plates 22 are installed in parallel to each other, a plurality of main reinforcing bars 23 are attached to the steel plate 21 via these chevron-shaped plates 22, and distribution reinforcing bars 24 intersect with the main reinforcing bars 23; It is composed of a plurality of dowel plates 25 protruding from the chevron plate 22 and concrete 26 cast on the steel plate 21.

The steel plate 21 is formed of a thick (approximately 6 mm) weather-resistant steel plate, and both edges of the steel plate 21 in the length direction, that is, in the direction in which it spans the main girder 27, are bent downward. A haunch portion 21a is formed.

The chevron plate 22 is formed, for example, by bending a flat steel into a continuous chevron shape, and the troughs 22a of the chevron plate 22 are attached onto the steel plate 21 by bolts 28 and nuts 29, as shown in FIG. It is connected and attached to.

Further, the main reinforcing bars 23 and the distribution reinforcing bars 24 are joined in a mesh shape at right angles to each other by a method such as spot welding, and a reinforcing wire mesh 35 is formed.
The reinforcing bar wire mesh 35 is the main reinforcing bar 23
It is attached onto the steel plate 21 by welding it to the upper surface of the ridge portion 22b of the angled plate 22 in parallel with the angled plate 22.

The dowel plate 25 is formed, for example, by bending a plate-shaped steel plate into a U-shape, and is attached to the upper surface of the valley portion 22a of the chevron plate 22 by being fastened together with the chevron plate 22 by bolts 28. .

In addition, the concrete 26 is the chevron plate 2 in the embodiment.
2. Main reinforcing bar 23, distribution reinforcing bar 24 and dowel plate 2
5 and the like is installed on the main girder 27 and then cast at the site, but it may also be constructed such that it is cast in advance at a factory or the like and integrated with the steel plate 21.

In FIG. 3, reference numeral 30 indicates a flat bar, and this flat bar 30 is for interconnecting adjacent steel plates 21. Also, 31 is a chevron plate 22
32 is a seal rubber, 33 is an angle member that connects the steel plates 21, and in FIG. 4 and FIG. The lapis muscle connecting the comrades is shown.

Next, an example of the construction procedure for the floor slab 20 configured as described above will be described. First, in a factory or the like, a plurality of chevron plates 22 are arranged in parallel on a steel plate 21 and connected with bolts 28. At this time, the dowel plate 25 is also tightened together with the bolt 28, and is provided in a protruding manner in the valley portion 22a of the chevron plate 22.
Then, a reinforcing wire mesh 35 made up of the main reinforcing bars 23 and distribution reinforcing bars 24 that have been joined in advance in a mesh shape is welded so that the main reinforcing bars 23 are on the upper surface of the ridges 22b of the angular plate 22. In this way, the chevron plate 22,
A steel plate 21 to which main reinforcing bars 23, distribution reinforcing bars 24, dowel plates 25, etc. are attached is erected on the main girder 27 as shown in FIG.
to be poured.

In the embodiment, the chevron-shaped plate 22 has a structure in which it is bolted onto the steel plate 21, but it may also be attached by welding.

According to the synthetic floor slab 20 of this embodiment having the above structure, there are various effects as described below.

First of all, since the wall thickness of the steel plate 21 is made thick (approximately 6 mm), the steel plate 21 not only functions as the bottom formwork, but also serves as a strength member and can support the entire weight of the poured concrete without the need for shoring. Of course, unlike conventional cast-in-place floor slab structures, this steel plate 21 does not require a structure in which a channel member is interposed to form a reinforcing bar cage and the steel plate is suspended from this reinforcing bar cage, and the material can be It is possible to save money and reduce the thickness of the floor slab. Moreover, after concrete is poured, extremely high strength can be exhibited as a composite deck slab through the chevron plate 22 and dowel plate 25, and durability can be increased.

Secondly, the chevron plate 22 is attached on the steel plate 21, and the main reinforcing bars 23 and the distribution reinforcing bars 24 are attached via the chevron plate 22, so that after concrete is poured, it can be placed inside the slab like a conventional channel member. Partition walls can be eliminated, the cause of cracks can be eliminated, and durability can be improved.

Thirdly, the chevron plate 23 is attached to the steel plate 2 by the bolt 28.
1, the distortion of the steel plate 21 is small.

Fourthly, the chevron plate 22 is connected in the direction in which the steel plate 21 is constructed on the main girder 27, and since the chevron plate 22 has a jagged shape, it is not suitable for the direction in which the steel plate 21 is pressed. There is a degree of freedom,
The steel plate 21 can be easily adapted to the main girder 27, and its installation is also simple.

Fifth, the distribution reinforcing bars 24 are installed in a direction perpendicular to the chevron plate 22, and when attaching the lap reinforcements 34, there is no need to insert them through the narrow part between the channel member and the main reinforcing bars as in the conventional case. The lap muscles 34 can be easily wrapped, and work efficiency during construction can be improved.

Sixthly, the dowel plate 25 is attached to the valley part 22a of the chevron plate 22.
Since the concrete 26 is provided in a protruding manner, it is possible to exert an effect of preventing the concrete 26 from shifting in the direction of the main girder, and it is possible to further strengthen the integration with the concrete 26.

As explained above, according to the composite deck slab of the present invention, a chevron plate made by continuously bending flat steel into a chevron shape is placed on the bottom formwork and a thick steel plate serving as a strength member in the width direction of the steel plate or Arranged parallel to one side of the longitudinal direction at a constant interval, dowel plates are protruded from the valleys of these chevron-shaped plates, and the valleys of the chevron-shaped plates are respectively attached to the steel plates. A reinforcing wire mesh formed by joining the main reinforcing bars and the distribution reinforcing bars that intersect with the main reinforcing bars in a mesh shape is attached to the steel plate, and furthermore, concrete is poured on the steel plate, so that the following effects can be achieved. play.

Since the steel plate functions not only as a formwork but also as a strength member, materials can be saved and the thickness of the deck slab can be reduced.

The steel plate and the concrete are firmly joined through the chevron plate and the dowel plate, and the concrete is prevented from slipping by the dowel plate, so the strength is increased and the durability is improved.

[Brief explanation of the drawing]

Figures 1A and 2B and 2A and 2B are vertical sectional views showing structural examples of conventional floor slabs, respectively, and Figures 3 to 6 show an embodiment of the present invention.
The figure is a perspective view of the composite floor slab, Figure 4 is a perspective view showing the state in which the composite floor slabs are connected, Figure 5 is a sectional view of the connecting part of the bottom formwork, and Figure 6 is an enlarged sectional view of the main part. It is. 20...Synthetic floor slab, 21...Bottom formwork, 22...
...Chevron plate, 22a...trough, 22b...peak, 2
3... Main reinforcing bar, 24... Distribution reinforcing bar, 25... Dowel plate, 26... Concrete, 28... Bolt,
29...Natsuto, 35...Reinforced wire mesh.

Claims (1)

[Scope of utility model registration request] Chevron plates made by continuously bending flat steel into a chevron shape are arranged on the bottom formwork and a thick steel plate serving as a strength member, parallel to either the width direction or the longitudinal direction of the steel plate at regular intervals. , dowel plates are provided protruding from the valleys of these chevron plates, and the valleys of the chevron plates are respectively attached to the steel plates, and main reinforcing bars and distribution reinforcing bars that intersect with the main reinforcing bars are arranged in a mesh shape on the upper surface of the peaks of the chevron plates. 1. A composite floor slab characterized in that a reinforcing wire mesh formed by joining a steel plate is attached, and furthermore, concrete is poured on the steel plate.