JPH02115437A - Form for constructing compound wall of steel plate and concrete - Google Patents

Abstract

PURPOSE:To enhance productivity by maintaining a pair of opposite steel plates alternately having projections and recesses at the predetermined distance with a separator of a truss body and filling concrete into a gap between both steel plates. CONSTITUTION:Steel plates 1 are formed via such a process that many recesses 1a and projections 1b of zigzag shape are positioned alternately. In addition, a shear connector 3 is fixed to the internal surface of the steel plates 1 at the upper and lower ends thereof. Also, a separator 2 is formed with a truss body A comprising upper and lower chords connected to each other with a lattice member. Furthermore, a pair of the opposite steel plates 1 are maintained at the predetermined distance with the separator 2. In addition, concrete is filled in a gap between both steel plates 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a pair of opposing concrete blocks processed so that a large number of concave portions and convex portions are alternately positioned to ensure adhesion to concrete. It consists of a steel plate and a separator that maintains both steel plates at a predetermined distance, and by pouring concrete into the gap between both steel plates without placing wall reinforcement, concrete is poured between the steel plates on both sides and the gap. The present invention relates to a formwork for constructing a steel plate-concrete composite wall in which hardened unreinforced concrete is structurally integrated through the concrete adhesion of the concave and convex portions.

[Conventional technology]

The present inventor has developed a pair of opposing steel plates that are processed so that a large number of concave portions and convex portions are alternately positioned to ensure adhesion with concrete, and a separator that maintains both steel plates at a predetermined distance. By pouring concrete into the void of the formwork without wall reinforcement, the steel plates on both sides and the unreinforced concrete cast in the void and hardened form the opening.

We have already proposed a permanent formwork construction method that constructs a steel plate-concrete composite wall that is structurally integrated through the adhesion of the concrete at the convex portions.

[Problem to be solved by the invention]

The above permanent formwork construction method not only omits the dismantling and removal of the formwork, but also omits the work of arranging wall reinforcements, simplifying the construction work, and also prevents wall reinforcements from becoming an obstacle to concrete pouring. It has many advantages, such as:

However, in the above-mentioned conventional example, as shown in Fig. 1), the separator consists of a steel plate a, a flange supporting the a, and a pole b attached to the vicinity of both ends, and a threaded portion at both ends thereof. Since it consisted of nuts d and d that were screwed together, there were the following problems.

(1) It is necessary to process the bolt holes for the steel plates a and a and insert the bolt hole c into the bolt hole, resulting in poor productivity.

(2) Both ends of bolt C and nut d screwed onto it
.

d protrudes from the outer surface of the rope plates a and a, and becomes an obstacle to the surface finish of the composite wall.

(3) Separators (bolts,
If only the steel plates a and a are connected using NAND), the steel plates a and a will wobble,
It is difficult to ensure the independence of the formwork.If the number of separators is increased to ensure the independence of the formwork, there may be holes that impede concrete pouring.

An object of the present invention is to solve these problems in the conventional example described above.

(Means for Solving the Problems) In order to achieve the above object, the technical means taken by the present invention are as follows. The separator is composed of a truss body consisting of an upper chord member, a lower chord member, and a lattice member connecting these members, and a plurality of the truss bodies are vertically arranged at predetermined intervals, and adhesive or adhesive is applied to the inner surfaces of the steel plates on both sides. This is due to the fact that it was fixed due to welding.

As the truss body, one made of expanded metal or one made of reinforcing steel is preferably used.

[Effect]

According to the above configuration, the separator is composed of a plurality of truss bodies arranged vertically at appropriate intervals, and the truss bodies are fixed to the W4 temporary inner surface on both sides with adhesive or welding. It can prevent the steel plate from wobbling and ensure the independence of the formwork.

However, since the truss body is arranged vertically, the truss body does not become an obstacle during concrete pouring, allowing dense concrete pouring.

Further, since the truss body is fixed to the inner surface of the steel plate by adhesive or welding, there is no need to drill holes in the steel plate or insert separators into small holes, and the production efficiency of the formwork can be improved.

Since the separator does not protrude from the outer surface of the steel plate, surface finishing of the composite wall is easy.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figures 1 and 2 show a formwork for constructing a steel plate concrete composite wall according to the present invention.
As shown in Figures 6 to 6, a pair of zigzag-shaped recesses 1a and zigzag-shaped protrusions 1b are pressed or rolled so that they are alternately positioned to ensure adhesion with concrete. Steel plates 1.1 facing each other and both steel plates 1
．． Separators 2 for maintaining the steel plates 1.1 at predetermined intervals, and shear connectors 3 made of reinforcing bars fixed to the inner surfaces of both upper and lower ends of each steel plate 1.1.

Then, as shown in Fig. 3, by pouring concrete 4 into the gap between both steel plates 1.1 without placing wall reinforcement, concrete 4 is poured between the steel plates 1.1 on both sides and the gap. The unreinforced concrete 4 that has been hardened by
A steel plate-concrete composite wall W is constructed which is structurally integrated through the concrete adhesion force of b.

The separator 2 includes an upper chord member 5a, a lower chord member 5b, and both 5.
It is constituted by a truss body A consisting of a lattice #5c connecting lattices #5b and #5b.

A plurality of truss bodies A are vertically arranged at predetermined intervals and fixed to the inner surfaces of the steel plates 1.1 on both sides by adhesive or welding such as high frequency welding. In the case of high frequency welding, steel plate 1
By applying high frequency electric energy from the outside, the steel plate 1 and the truss body A are fixed to each other. In addition, as for fixing the shear connectors 3..., means such as adhesive, high frequency welding, resistance welding, spot welding, etc. can be appropriately employed.

The truss body A is made of expanded metal, as shown in FIGS. 7 and 8. In the expanded metal truss body A shown in FIG. 7, the straight plate portions of both side edges bent in the same direction and having an abbreviated cross-section are at the top.

The lower chord members 5a and 5b are used, and the stretched portion in the middle is a lattice member 5c. In the expanded metal truss body A shown in Fig. 8, the straight plate portions of the side edges bent in opposite directions and having an abbreviated cross section are the upper and lower chord members 5a and 5b, and the stretched portion in the middle is the lattice member 5c. It has become.

The above-mentioned formwork is composed of a plurality of truss bodies A in which separators 2 are arranged vertically at appropriate intervals, and the truss bodies A have high rigidity. , high frequency welding) on both sides of the steel plate 1. l
Since it is fixed to the inner surface, the fixed region becomes linear, and it is possible to effectively prevent the steel plate 1.1 from wobbling, and to ensure the independence of the formwork.

However, since the truss body A is arranged vertically (the upper chord member and the lower chord member are vertical), the truss body A does not become an obstacle when pouring concrete 4, and dense concrete pouring is possible.

Also, depending on the size of the expanded metal mesh that constitutes the truss body A, the separator 2 can also be used as a concrete pouring board, and as shown in Fig. 1θ (a) and (b), the separator 2 In the void section divided by
It is possible to successively place the concrete 4 from the negative side to the other side at different times.

In particular, the steel plate 1 is pressed or rolled with a large number of concave and convex portions 1a and 1b to ensure adhesion to concrete.
1, concrete 4 and steel plate 1 are used without placing wall reinforcement between steel plates 1 and 1.

1 can be structurally integrated with the separator 2, and since the separator 2 is composed of the highly rigid truss body A, the separator 2...
・Because the mutual spacing can be widened and the truss bodies A are arranged vertically, it is possible to eliminate obstacles during concrete pouring, and it is possible to pour concrete by the following method. .

That is, as shown in Figures 10 (a) and (b), the concrete pouring pipe (or tremie pipe) of the concrete pump car
6 is positioned near the bottom of the gap between the truss bodies A, A, and the concrete 4 can be placed sequentially from the bottom to the top while applying discharge pressure. Concrete 4 can also be placed densely and the quality of concrete can be improved.

In addition to being made of expanded metal, the truss body A may be made of reinforcing bars (preferably made of assembled reinforcing bars) as shown in FIG. 9. The truss body A made of assembled reinforcing bars shown in the same figure is It utilizes so-called omni-reinforcing bars, in which the upper chord member 5a is composed of one reinforcing bar, the lower chord member 5b is composed of two reinforcing bars, and a large number of substantially V-shaped reinforcing bars welded across these bars form a lattice. Although not shown in the figure, a so-called Kaiser reinforcement using two continuous reinforcing bars in a zigzag shape may be used instead of the substantially V-shaped reinforcing bars. The separator 2 may be constructed of an I-type reinforcing bar truss body in which each of the lattice members 5b is composed of two reinforcing bars and the lattice member 5c is composed of one reinforcing bar.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it can achieve the following effects.

■It is composed of multiple truss bodies with separators arranged vertically at appropriate intervals, and the truss bodies have high rigidity.
Moreover, since the truss body is fixed to the inner surface of the steel plates on both sides with adhesive or welding, the steel plates are prevented from wobbling more reliably than when the steel plates are connected with scattered separators, and the independence of the formwork is improved. Can be secured.

■ Not only are there no wall reinforcements that would get in the way of concrete pouring, but since the truss body is placed vertically, the truss body does not become an obstacle when pouring concrete, and the concrete pouring pipe or tremie of the concrete pump truck The pipe is positioned near the bottom of the gap between the truss bodies, and concrete can be poured from the bottom to the top while applying discharge pressure. Even hardened concrete with a low water-to-cement ratio can be poured densely. Concrete quality can be improved.

■Since the truss body is fixed to the inner surface of the steel plate by adhesive or welding, there is no need to drill holes in the steel plate or insert separators into small holes, making it suitable for mechanization and automation of formwork manufacturing (factory automation). Therefore, the production efficiency of the formwork can be improved, and since the separator does not protrude from the outer surface of the steel plate, the surface finishing of the composite wall is easy.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of the formwork for constructing a steel plate concrete composite wall, Figure 2 is a plan view of the formwork, Figure 3 is a sectional view of the steel plate concrete composite wall, and Figure 4 is a front view of the steel plate. , 5th
The figure is an enlarged view of the main part of the steel plate, FIG. 6 is a sectional view taken along the line Vl-Vl in FIG. 5, and FIGS. 7 to 9 are perspective views illustrating the truss body.
Figure 10 (a). (b) is a schematic cross-sectional view for explaining the concrete placing method. Figure 1) is an explanatory diagram of a conventional example. A...Truss body, l...Steel plate, 1a...Recess, 1
b...Convex portion, 2...Separator, 4...Concrete, 5a...Top chord material, 5b...Lower chord material, 5c...
・Lattice material.

Claims (3)

[Claims] (1) Consists of a pair of opposing steel plates processed to have a large number of alternating recesses and protrusions to ensure adhesion with concrete, and a separator that maintains the two steel plates at a predetermined distance. By pouring concrete into the gap between both steel plates without placing wall reinforcement, the steel plates on both sides and the unreinforced concrete cast in the gap and hardened are combined with the concrete in the concave and convex areas. A formwork for constructing a steel plate-concrete composite wall that is structurally integrated through bonding force, wherein the separator is constituted by a truss body consisting of an upper chord member, a lower chord member, and a lattice member that connects them. A formwork for constructing a steel plate-concrete composite wall, characterized in that a plurality of said truss bodies are arranged vertically at predetermined intervals and are fixed to the inner surfaces of steel plates on both sides by adhesive or welding. (2) The formwork for constructing a steel plate concrete composite wall according to claim (1), wherein the truss body is made of expanded metal. (3) The formwork for constructing a steel plate concrete composite wall according to claim (1), wherein the truss body is made of reinforcing steel.