JPS62299B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a casting formwork used for construction work of reinforced concrete structures.

As one of the conventional methods of streamlining formwork construction, for example, in place of using plywood for wall formwork and floor formwork, precast concrete plates are used as cast formwork. ―86012
There are those described in Publication No. 1 and No. 54-3811.
In the former example, reinforcing bars are arranged inside a PC board, and reinforcing bar cages are arranged at regular intervals on the top of the PC board. In the latter example, reinforcing bars are placed inside the PC board,
Lattice materials are arranged side by side at regular intervals on this PC board. However, the former example
Since the reinforcing bars and the lower part of the reinforcing bar cage are embedded within the board, the board becomes thicker, making it difficult to reduce weight and making handling difficult. This requires three steps: arranging each cage one by one, and joining the reinforcing bars to the bottom of the cages, resulting in a very time-consuming process. Similarly to the former, in the latter case, the reinforcing bars and the lower part of the lattice material are located inside the plate, so the plate thickness is thicker, and when manufacturing it, the labor for reinforcing and the lattice material are reduced.
It takes time and effort to line them up one by one. As described above, all of the formworks have the drawbacks of being thick, making them unsuitable for weight reduction, not being easy to handle, and not being able to be manufactured quickly.

The purpose of the invention is to reduce the weight, and another purpose is to speed up manufacturing and installation.

An embodiment of the present invention will be described based on the drawings. In FIG. 1, a formwork A according to the present invention is manufactured from a perforated steel plate (steel mesh),
A surface portion 1 and a rib portion 2 are formed by folding a steel plate, and each rib portion is made of two sheets stacked one on top of the other. The surface portion 1 and the rib portion 2 have a large number of holes 3, . The height of the rib part is
It is possible to ensure a sufficient cover thickness for the main reinforcement 5 through which it is inserted. Furthermore, the rib end portion 2a has the same function as a structural reinforcing bar. Part of the surface part 1 and rib part 2 is made of precast concrete plate 4.
It is typed inside.

The formwork A is manufactured by setting a perforated steel plate having a surface portion 1 and a rib portion 2 in the formwork, and then pouring concrete into the formwork.

Next, an example of constructing a floorboard F using the driving formwork A of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, a main floor reinforcement 5 is passed through the hole 3 of the rib portion 2, and this main reinforcement is fixed. The position of hole 3 must be such that sufficient thickness of main reinforcing reinforcement can be secured. Therefore, concrete is poured on the top surface of the formwork A, but since the end 2a of the rib portion 2 will serve as the reinforcing bar of the structure, if the amount of reinforcing bar at this end is insufficient, reinforcing bar 7 will be placed. After arranging and pre-assembling the other main reinforcements 8 and 9, concrete 10 is poured to complete the construction of the deck slab F.

As explained above, according to the present invention, only the face portion of the perforated steel plate is disposed inside the plate, so compared to the plate thickness of conventional precast concrete members in which reinforcing bars are arranged. As a result, it can be made thinner and lighter overall, making it easier to handle. Further, when manufacturing the mold, since the surface portion and the rib portion are integrated, it is only necessary to set it in the mold once, so that manufacturing can be performed simply and quickly. Furthermore, since the rib portion is made of two layers, the reinforcing effect can be enhanced. In addition, since the rib end has the function of structural reinforcing bars, it can perform the same function as reinforcing bars pre-assembled in the driving form, and the holes in the rib can be used to position the reinforcing bars and temporarily Since it can be stopped and the weight of the driving formwork can be reduced, construction work such as reinforcing steel work and transportation work can be done quickly.

[Brief explanation of the drawing]

FIG. 1 is a perspective view, and FIG. 2 is a sectional view. A... Casting formwork, 1... Face part, 2... Rib part, 2a... End of rib part, 3... Hole, 4... Precast concrete plate, 5, 8, 9... Main reinforcement, 10 ……concrete.

Claims (1)

[Claims] 1. The surface portion and the rib portion are integrally formed by a perforated steel plate, the surface portion is cast into a precast concrete plate, and the rib portion is formed by bending the steel plate into two pieces. The ribs shall be overlapped and have holes through which the main reinforcement can be inserted, and the height shall be sufficient to ensure the covering thickness of the main reinforcement mentioned above, and the rib end shall function as a structural reinforcement. Features a driven formwork. 2 The face part and the rib part are integrally formed from a perforated steel plate, the face part is cast into a precast concrete plate, and the rib part is formed by folding the above steel plate into two layers, and inserting the main reinforcing bars. The height of the hole is sufficient to ensure the above-mentioned main reinforcement cover thickness, and a driving formwork is used in which the rib end has the function of structural reinforcement. , A method of using a pouring formwork characterized by placing main reinforcing bars in the rib portion and pre-assembling the reinforcing bars, and then pouring concrete.