JPH0325577B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a three-dimensional triangular truss structure and a formwork structure for concrete, and more particularly to a three-dimensional triangular truss structure and a concrete structure in which this structure is combined with plate materials. This invention relates to a structure for a formwork structure.

[Conventional technology]

A three-dimensional triangular truss structure (hereinafter referred to as a triangular truss), as shown in FIG. It is something. A large number of the diagonal members 3 are provided so as to span both sides of the upper chord member 1. In addition, as shown in Fig. 2, a continuous V-shaped diagonal member 1
There is also a triangular truss in which the trusses 3 are provided parallel to both sides of the upper chord member 1 and to the lower chord members 2A and 2B, respectively. Such a triangular truss is used to manufacture slab formwork for construction materials, such as precast concrete plates, and this is used as both the formwork and the frame structure of concrete structures.

This precast concrete plate is made by pouring concrete into a structure consisting of a triangular truss and transverse reinforcement (distribution reinforcement). Horizontal reinforcements are provided to add strength and rigidity to the structure, and are installed with binding wires or the like on the underside of the bottom chord in a direction perpendicular to it to prevent concrete from falling off when the structure is lifted. It is fixed and placed.
However, with such fixing using binding wires, etc., the transverse reinforcement may separate from the bottom chord material when the concrete is cooled slightly, and there is a problem that the truss reinforcement may come off during demolding or installation, causing the concrete plate to fall.
In addition, there was a problem that the workability was poor because the horizontal stripes were fixed with binding wires or the like. Furthermore, producing such structures in factories requires a curing period for the concrete, which takes many days to manufacture, and since it is a semi-concrete product, it is heavy and cannot be easily moved by hand, making it inconvenient to handle. However, it also had the disadvantage of being expensive to transport to the construction site.

On the other hand, steel deck plates such as keystone plates and slit deck plates are known as slab formwork for construction, but such flat formwork does not have sufficient strength and rigidity, so it has a wide span. It has the disadvantage that it cannot be removed and cannot be used as part of a concrete structure.

[Problem to be solved by the invention]

The purpose of the present invention is to eliminate the drawbacks of the above-mentioned prior art, to provide sufficient strength and rigidity, to be excellent in workability in factories and on-site, to reduce weight, and to allow formwork structures to be used as they are in concrete structures. The object of the present invention is to provide a three-dimensional triangular truss structure and a formwork structure for concrete that can be used as a part of the concrete.

[Means to solve the problem]

The present invention provides continuous V-shaped diagonal members in parallel on both sides of one upper chord member and a pair of lower chord members, and in which the lower apex of the diagonal member projects downward from the lower chord member, A three-dimensional triangular truss structure characterized by inserting and fixing transverse reinforcement into a semicircular part formed by the lower apex (protruding part) of the diagonal member and the lower chord member,
The present invention also relates to a formwork structure for concrete, characterized in that the lower top of the diagonal member of the structure and the panel are fixed and integrated.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 3 is a side sectional view of a formwork structure showing an embodiment of the present invention. The triangular truss of this structure connects the lower top of the diagonal member 13 shown in Fig. 2 to the lower chord member 2.
A and 2B, and the protrusion 13
By inserting and fixing the transverse reinforcement 5 into the semicircular part surrounded by A, 13B and the lower chord members 2A, 2B, and further fixing the panel to the top of the protruding parts 13A, 13B, the strength can be further increased. Dimensional stability can be ensured. A so-called keystone plate 4A is used as the panel, and the protrusions 13A and 13B are fixed to the plate 4A so that the groove direction of the plate 4A is perpendicular to the direction in which the striations of the triangular truss are arranged. Further, since the triangular truss as in this embodiment has the transverse reinforcement 5 inserted into the semicircular portion and is fixed, the triangular truss structure is stronger than the triangular truss shown in FIGS. 1 and 2. .

In addition to the corrugated keystone plate, the panel to be combined with the triangular truss may be a flat plate or a deformed plate made of metal such as steel plate, aluminum, inorganic material such as resin concrete, ceramics, or organic material such as fiber-reinforced resin. The resin concrete may be one in which concrete is impregnated with a resin, or one in which a resin is mixed in advance with concrete.

When using resin concrete, fiber-reinforced resin, ceramics, etc. as the panel, rust prevention,
Chemical resistance is further improved, and the durability of concrete structures is improved.

In the above embodiment, the triangular truss and the panel were fixed by welding, but this is not limited to welding.
For example, when using panels made of resin concrete, fiber-reinforced resin, etc., it is preferable to fix them with an adhesive.

Further, even when a precast concrete plate is manufactured using the triangular truss of the present invention described above, that is, the triangular truss in which the transverse reinforcement is inserted and fixed into the semicircular part of the lower chord protrusion, the transverse reinforcement is located on the lower side of the truss reinforcement (lower chord). This increases the strength and rigidity, allowing the concrete thickness (plate thickness) to be thinner than before and reducing weight.

Furthermore, when covering the surface of the structure with resin mortar, the thickness of the protrusion 13A or 13B is sufficient to cover the resin mortar stipulated by the building standards, so the coating thickness should be made thinner. Is possible.

〔Effect of the invention〕

According to the three-dimensional triangular truss structure of the present invention, a triangular truss is used in which the lower apex of the diagonal member of the triangular truss is made to protrude, and a transverse reinforcement is inserted and fixed in the semicircular part surrounded by the protruding part and the lower chord member. As a result, high strength and rigidity can be imparted, and the process of fixing the transverse reinforcement with binding wires or the like can be omitted, thereby shortening the work in the factory and on-site. Furthermore, even when a precast concrete plate is manufactured using the triangular truss, the thickness of the concrete can be made thinner than before, so the weight can be reduced, and the protruding parts of the triangular truss also meet the requirements of building standards. Since a sufficient amount of cover can be removed, rust prevention properties are improved, and when covering with resin mortar or the like, the thickness of the coating can be reduced.

According to the concrete formwork structure of the present invention in which the triangular truss and the panel are fixed and integrated,
It is significantly lighter than conventional precast concrete plates, etc., making it easier to transport and handle.

Furthermore, even when on-site work is performed using the formwork structure of the present invention, it can be easily transported by hand without necessarily relying on machines, and the on-site workability is extremely convenient.

Furthermore, the combination of the triangular truss and the panel improves the strength of the panel, which provides the advantage of allowing a wider span compared to conventional panels.

[Brief explanation of drawings]

FIGS. 1 and 2 are perspective views showing examples of conventional triangular truss structures, respectively, and FIG. 3 is a sectional view of a concrete formwork structure showing an embodiment of the present invention. 1...Top chord material, 2A, 2B...Lower chord material, 3,1
3... diagonal material, 4A... keystone plate, 5...
...Horizontal stripes, 13A, 13B...Protruding parts.

Claims (1)

[Scope of Claims] 1. Continuous V-shaped diagonal members are provided in parallel on both sides of one upper chord member and a pair of lower chord members, and the lower apex of the diagonal member is placed below the lower chord member. A three-dimensional triangular truss structure characterized in that a transverse reinforcement is inserted and fixed in a semicircular part that protrudes and is surrounded by the lower top part of a diagonal member and a lower chord member. 2 Continuous V-shaped diagonal members are provided in parallel on both sides of one upper chord member and a pair of lower chord members, and the lower apex of the diagonal member is made to protrude downward from the lower chord member, and the lower chord member is A formwork structure for concrete, characterized in that a transverse reinforcement is inserted and fixed into a semicircular part formed between a top part and a lower chord member, and the lower top part of the diagonal member and a panel are further fixed and integrated.