JPH0349335B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reinforced concrete slab that integrates floor formwork and floor reinforcement to increase the prefabrication rate.

[Conventional technology and problems]

When constructing conventional reinforced concrete slabs, it is common to support the formwork with shoring, and the shoring and formwork must be removed and demolded after a considerable period of time. It takes a lot of effort on the muscles.

In view of these points, there is a construction method that uses dumped formwork and dumped beams, but this is not economical because it is impossible to construct large spans, the number of small beams increases, and the amount of temporary construction materials increases. In addition, there are cases where thin-skinned concrete plates are used as formwork, but this requires shoring, increases weight, and makes it difficult to integrate with other construction work. The production cost of thin-skinned concrete plates cannot be ignored either.

[Means for solving problems]

This invention was created to solve the above-mentioned conventional problems, and it is a reinforced concrete slab that increases the prefabrication rate, has a rational structure, improves workability and economic efficiency, and enables the construction of large spans. The purpose is to provide

Therefore, in the reinforced concrete slab according to the present invention, a plurality of truss beams are arranged at predetermined intervals on the upper surface of a steel plate supported by peripheral members of the slab such as beams, and after the reinforcement is arranged, the floor concrete is The truss beam consists of an upper chord member and a lower chord member made of large-diameter reinforcing bars connected by a diagonal member through a gusset plate, and a gusset plate placed on the lower chord member is connected to the lower part of the gusset plate. is characterized by having a pedestal for placing the truss beam on a steel plate.

〔Example〕

1 and 2 show an embodiment of the present invention, and FIGS. 3 to 5 each show details of the main parts of FIG. 1. In the figure, numeral 1 is a steel plate, and 2 is a truss beam.

As shown in Fig. 1, the lower surfaces of the floor and beams are covered with thin flat iron plates 1 (not shown) supported by peripheral members of the slab. A truss beam 2 is provided.

In the embodiment, the truss beam 2 is constructed by connecting an upper chord member 3 and a lower chord member 4 made of two large-diameter reinforcing bars, and a diagonal member 5 made of a steel pipe or the like via a gusset plate 6, as shown in FIG. As shown, an upper end reinforcement 11 is placed on top of the upper chord member 3, and a lower end reinforcement 12 is placed on top of the lower chord member 4.
Reinforcements are arranged perpendicularly to the longitudinal direction of the truss beam 2, respectively.

Further, as shown in FIGS. 3 and 4, the gusset plate 6 is attached integrally with the support fitting 7. As shown in FIG. 5, this support fitting 7 consists of a support plate 8 welded and fixed to the gusset plate 6, and a presser plate 9 fixed to the support plate 8 with bolts or the like, and includes an upper chord member 3 or a lower chord member. 4 and the gusset plate 6 can be easily and reliably fixed.

In the embodiment, the connection between the gusset plate and the diagonal member 5 is achieved by inserting and fixing bolts, rivets, etc. into holes drilled at the center of the gusset plate 6 and at the ends of the diagonal member 5.

In addition, as shown in FIG.
A pedestal 10 is provided to be placed on top.
Therefore, there is no need for reinforcement spacers, and the reinforcement work can be easily performed.

As described above, after arranging the truss beam 2 on the iron plate 1 and performing reinforcement, the floor concrete 13 is poured to complete the construction.

[Effects of the Invention] Since the load during concrete pouring is carried by the steel plates supported by peripheral members such as the building frame and the truss beams supported by the steel plates, shoring of supports is not required. Furthermore, after the concrete hardens and the slab is completed, the truss beam and reinforcement (top reinforcement, bottom reinforcement, etc.) resist the load together with the concrete, resulting in high rigidity and a long support span.

Since the load is carried by supported steel plates and truss beams, no shoring is required, allowing for a wide working space under the floor, and construction can be easily carried out without interference with piping.

By using iron plates, the amount of concrete and floor height can be reduced compared to the conventional example using deck plates.

The upper end reinforcement or lower end reinforcement only needs to be installed on top and bottom of the upper and lower chord members that form the truss beam, and a pedestal is provided at the bottom of the gusset plate on the lower chord side, making reinforcement work easy. It can be prefabricated.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing the frame state, FIG. 2 is a sectional view showing the state after concrete is poured, and FIG. 3 is an enlarged perspective view of part A in FIG. 1. FIG. 4 is an enlarged perspective view of part B, and FIG. 5 is a partially enlarged perspective view of FIG. 3. DESCRIPTION OF SYMBOLS 1... Iron plate, 2... Truss beam, 3... Upper chord member, 4... Lower chord member, 5... Diagonal member, 6... Gusset plate, 7... Support metal fittings, 8... Support plate, 9...
...Press plate, 10...Pedestal, 11...Top end reinforcement, 12
...Bottom reinforcement, 13...Concrete.

Claims (1)

[Claims] 1 A reinforced concrete slab is made by placing a plurality of truss beams supported by pedestals at predetermined intervals on the upper surface of a steel plate supported by surrounding members of the slab, placing reinforcement, and then pouring floor concrete. The truss beam is formed by connecting an upper chord member and a lower chord member made of large-diameter reinforcing bars with a diagonal member through a gusset plate, and a steel plate is attached to the truss beam at the lower part of the gusset plate arranged on the lower chord member. A reinforced concrete slab, characterized in that the above-mentioned pedestal is provided for placing the slab on top.