JPH0776901A - Hollow synthetic structure plate and method for manufacturing the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a light weight hollow synthetic structure board having a composite structure of a plate material and a concrete layer and having little directionality. [Structure] Structural plate A plate material for providing a hollow portion in the thickness direction
The concrete layers 12 and 13 are formed on both ends in the thickness direction of the lower side and the upper side with the 11 sandwiched therebetween. A concrete layer 14 is also formed on the peripheral side surface of the plate material 11. The upper and lower end portions of the plate material 11 and the surrounding convex portions are embedded in the concrete layers 12, 13, and 14. Plate material 11
Is formed by arranging a large number of hollow portions 11a in the thickness direction of the structural plate, which are mainly hexagonal in plan view, side by side. Into each hollow portion 11a, except for the upper and lower end portions of the plate material 11, a lightweight burying material 15 such as expanded polystyrene is incorporated. The upper and lower concrete layers 12 and 13 are embedded with mesh reinforcement 21 and PC steel stranded wire 22 for prestressing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow synthetic structural plate used for building wall materials, floor materials, etc., and a method for manufacturing the same.

[0002]

2. Description of the Related Art A lightweight concrete flat plate mainly has a structure in which a cavity is provided in addition to the weight saving of concrete itself. The structure that provides this cavity is JIS A 65.
11 "Cavity prestressed concrete panels" and structures such as extrusion-molded cement boards or corrugated pipes are provided in the longitudinal direction to form a cavity.

Further, as a concrete plate having a hollow portion in the thickness direction thereof, there is a "honeycomb structure concrete plate" disclosed in Japanese Utility Model Publication No. 2-24824 in which a concrete honeycomb structure is devised.

The honeycomb structure concrete plate described in this publication is a rebar assembly in which hexagonal columnar buried formwork pieces are juxtaposed in a cave via spacers on the formwork, and rebar connecting pipes are radially diverged. Using tools, assemble the rebars on the gaps between the adjacent buried formwork pieces, the gaps between the buried formwork pieces and the formwork, and the buried formwork pieces in a turtle shell shape. The slab is constructed by placing concrete on the gap between the buried mold pieces and the upper surface of the mold pieces.

The above-mentioned honeycomb structure (honeycomb core in an aircraft) is a structure developed in the aircraft field, and is made of metal such as aluminum or aramid fiber (honeycomb shape).
Is used as a structural material by sandwiching a sheet of carbon fiber composite material (CFRP).

[0006]

The weight reduction by concrete itself has a problem in frost damage resistance, and the method of forming the hollow portion in the longitudinal direction of the plate has directionality and there is a limit to the weight reduction.

In the honeycomb structure of concrete itself described in the above-mentioned publication, a large number of buried formwork pieces are installed in order to provide a cavity in the thickness direction of the concrete plate, and a complicated reinforcing bar is provided on a thin-walled concrete plate that constitutes the honeycomb. However, it is not easy to manufacture because it requires a lot of labor in the process of installing them. Further, since shear stress is transmitted by the honeycomb concrete thin plate, the thin plate cannot be excessively thinned, and there is a limit to weight reduction.

[0008] As described above, there is a need for a concrete board which has a reduced dead load (self-weight) and has little directionality, mainly in the construction industry.

The present invention has been made in view of the above circumstances, and is a synthetic structure of a plate material and a concrete layer, which is light in weight and has little directionality. An object of the present invention is to provide a manufacturing method that can be manufactured.

[0010]

According to a first aspect of the present invention, there is provided a sandwich structure in which a concrete material is arranged at both ends in the thickness direction of a structural material with a plate material for providing a hollow portion in the thickness direction sandwiched therebetween. A hollow synthetic structure plate having both ends in the thickness direction of the plate material embedded in a concrete layer.

According to a second aspect of the present invention, a lower concrete layer is placed in a formwork, and a lower end portion of a plate material in which a lightweight embedding material for forming a hollow portion in a thickness direction of a structural board is incorporated is formed as a lower part. Is embedded in the concrete layer, and the concrete layer of the upper part and the side part is placed on the upper end and the side surface of the plate material.

[0012]

According to the first aspect of the present invention, the shear stress transmission is ensured by the sandwich structure in which both end portions in the thickness direction of the plate material in which the hollow portion is provided in the thickness direction of the structure plate are embedded in the concrete layer.

According to the second aspect of the present invention, the lower concrete layer is placed in the mold, the light weight embedded material embedded board is embedded in the lower concrete layer, and the upper and side concrete layers are placed in sequence. As a result, the hollow synthetic structure plate can be easily manufactured.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in FIGS.

FIG. 1 shows a hollow synthetic structural plate according to the present invention. As shown in FIG. 1 (A), a plate material 11 for sandwiching a hollow portion in the thickness direction (vertical direction) of the structural plate is sandwiched between the plates. Concrete layer 12 at both ends in the thickness direction of the lower side and the upper side,
13 is a sandwich structure plate in which 13 is arranged. A concrete layer 14 is also provided on the peripheral side surface of the plate material 11.

Both the upper and lower end portions of the plate material 11 and the surrounding convex portions are embedded in the concrete layers 12, 13 and 14, and a hollow portion is provided in the plate material in the vertical direction except the upper and lower end portions thereof. Light weight embedded material 15 such as styrofoam is incorporated.

The plate material 11 is shown in plan view in FIG.
Or the hollow portion 11a in the thickness direction of the structural plate mainly having a hexagonal shape as shown in FIG. 3 (A), and in the thickness direction of the structural plate mainly having a quadrangular shape as shown in FIG. 3 (B). Hollow part 11b, as shown in FIGS. 3C and 3D, hollow parts 11c and 11d in the thickness direction of the structure plate mainly composed of a circle or FIG.
As shown in (E), since a large number of hollow portions 11e in the thickness direction of the structural plate, which are mainly triangular, are arranged side by side in the plane direction, a thin plate material has a structure with little directivity. There is. For example, a hexagonal honeycomb plate is a thin steel plate of about 0.2 mm, an aluminum plate, or a fiber-reinforced composite material (FR) reinforced with fibers.
P) or the like may be used.

As shown in the left half of FIG. 1 (B), the upper and lower concrete layers 12 and 13 are embedded with mesh reinforcements 21 and PC steel strands 22 for prestressing.

Next, a method of manufacturing this hollow synthetic structure plate will be described mainly with reference to FIG.

First, at a predetermined position in a formwork for producing a concrete plate, a mesh reinforcement for a lower concrete layer is placed.
21a and PC steel strands for prestressing 22
After arranging and tensioning a, the required amount of lower concrete layer 12 is placed in the formwork.

After that, before the lower concrete layer 12 is hardened, a plate material 11 pre-assembled into a hexagonal shape or the like for providing a hollow portion 11a or the like is placed on the lower concrete layer 12,
Press the plate material 11 while vibrating the formwork,
The lower end of the plate material is embedded in the lower concrete layer 12.

At this time, in consideration of embedding the upper and lower end portions of the plate material 11 in the concrete layer, the hollow portions 11a and the like formed in the plate material 11 in a hexagonal shape are formed in the plate material 11 inside. Except for the upper and lower end portions, a lightweight embedding material 15 such as Styrofoam is installed and arranged in advance.

Finally, a PC steel wire 22b is placed at a predetermined position in the mold above the plate 11, and after tensioning, the mesh is placed at a predetermined position in the mold above the plate 11 and corresponding to the peripheral side surface of the plate 11. The stirrup 21b is installed and the upper and side concrete layers 13 and 14 are placed and finished on the upper end and the side of the plate 11. Although the prestressed concrete is described in this embodiment, an RC structure may be used.

The hollow synthetic structure board can reduce the weight by 40% as compared with a normal concrete board, and 10% as compared with a concrete board having the same yield strength and thickness of a similar hollow prestressed concrete panel. It has become possible to reduce the weight.

[0025]

According to the first aspect of the present invention, since the plate material for providing the hollow portion in the thickness direction of the structural plate is sandwiched by the concrete layers, the weight is significantly reduced as compared with a normal concrete plate. In addition, it is possible to achieve a sufficient weight reduction compared to a conventional hollow prestressed concrete panel having the same yield strength and thickness. In addition, the structure has less directivity than the conventional hollow prestressed concrete panel.
Furthermore, since both ends of the plate material for forming the hollow portion are embedded in the concrete layer, stress transmission (particularly shear stress transmission) can be reliably performed by the integration between the plate material and the concrete layer.

According to the second aspect of the invention, the lower end portion of the plate material in which the light-weight embedding material for placing the lower concrete layer in the formwork and providing the hollow portion in the thickness direction of the structural board is incorporated Is embedded in the lower concrete layer, and the upper and side concrete layers are placed on the top and side surfaces of the plate material.Therefore, as with conventional honeycomb structure concrete plates, a large number of embedded molds are embedded in the formwork. Since there is no need to arrange frame pieces and complicated reinforcing bars, it is easy to manufacture, and a plate material that is thinner and lighter than a conventional honeycomb concrete thin wall plate and has excellent strength can reliably transmit shear stress.

[Brief description of drawings]

1A is a sectional view in the thickness direction showing an embodiment of a hollow synthetic structure plate of the present invention, and FIG. 1B is a sectional view in the plane direction thereof.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 (A) is a plate material having a hexagonal hollow portion, (B)
FIG. 3 is a plan view showing a plate material having a square hollow portion, (C) and (D) a plate material having a circular hollow portion, and (E) a plate material having a triangular hollow portion.

[Explanation of symbols]

 11 Plate materials 11a to 11e Hollow part 12, 13, 14 Concrete layer 15 Light weight buried material

Claims (2)

[Claims] 1. A sandwich structure in which concrete layers are arranged at both ends in the thickness direction with a plate material sandwiched between the structural plates in the thickness direction, and both ends in the thickness direction of the plate material are embedded in the concrete layer. A hollow synthetic structure board characterized by being rare. 2. A plate material in which a lower concrete layer is placed in a formwork, and a lower end portion of a plate material in which a lightweight embedding material for forming a hollow portion in the thickness direction of a structural board is incorporated is embedded in the lower concrete layer. A method for producing a hollow synthetic structure board, which comprises placing concrete layers at the upper and side portions on the upper and side surfaces of the concrete.