JPH07173894A - Half-precast concrete plate and production thereof - Google Patents

Abstract

PURPOSE:To produce high strength and light weight half-precast concrete plates used for building floor materials or the like. CONSTITUTION:A spacer 3 is disposed on the bottom face of a form 2 and mesh reinforcements 4 are placed on the spacer 3 and truss reinforcements 5 are put along the longitudinal direction of a form 2 on the mesh reinforcements 4 and further, metallic tubes 6 are fitted to the base ends of lattice reinforcements 5b of the truss reinforcements 5. PC steel materials 7 are inserted in the metallic tubes 6 and both sides of the PC steel materials 7 are supported at the support 8 provided at the shorter side of the form 2. Concrete is placed into the forms 2 under the state that the PC steel materials 7 are applied in advance with a tensile strength to produce light weight ana high strength half-precast concrete plates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precast concrete board, and more particularly to a half precast concrete board used for a floor material for construction and a method for producing the half precast concrete board.

[0002]

2. Description of the Related Art A conventional half-precast concrete plate of this type has an RC structure in which truss bars assembled by welding are arranged in a mold and concrete is poured so that a part of the truss bars is exposed. Things are generally known.

[0003]

Since the conventional half-precast concrete board has an RC structure, it cannot be used as a floor material having a long member and a weak member strength. If the member is thickened to increase the strength of the member, the weight of the concrete plate increases, which significantly deteriorates workability and transportability when the concrete plate is installed in a building.

Therefore, there arises a technical problem to be solved in order to manufacture the half precast concrete plate with high strength and light weight, and the present invention aims to solve the problem.

[0005]

The present invention has been proposed in order to achieve the above-mentioned object, and is a half precast concrete board used for building flooring,
A spacer is arranged on the bottom surface of the half precast concrete plate, a mesh reinforcement is placed on the spacer, and a truss reinforcement is provided on the mesh reinforcement along the long side direction of the formwork. A metal pipe is attached to the base end of the lattice muscle, and a PC steel material is inserted into the metal pipe to expose the upper portion of the truss reinforcement, and the base end of the lattice reinforcement. In the mold, the both ends of the PC steel material inserted into the mounted metal tube are supported by the bearing portions provided on the short sides of the mold, and a tensile force is applied to the PC steel material in advance. It is intended to provide a method for producing a half-precast concrete plate, in which concrete is poured, and the preform is introduced by forming so as to bury the PC steel material and the metal pipe from the bottom surface of the formwork.

[0006]

Operation: The PC steel material is inserted through the metal pipe attached to the lattice-muscle base end portion of the truss reinforcement arranged along the long side direction of the form, and both ends of the PC steel material are connected to the short side of the form. It is supported by the bearing part provided in the. A structure in which a tensile force is applied to the PC steel material from the bearing portions at both ends and concrete is placed in the formwork until the metal pipe in which the PC steel material is inserted is buried and the upper portion of the truss bar is exposed. A half-precast concrete board with prestress introduced can be manufactured.

As described above, the manufactured half-precast concrete plate is lightweight and has high strength because of the introduction of prestress.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 shows a half precast concrete plate 1, in which spacers 3, 3 ... Are arranged on the bottom surface of a form 2, and mesh streaks 4 are placed on the spacers 3, 3. Then, truss reinforcements 5, 5, ... Are arranged above the mesh reinforcements 4 along the long side direction of the mold 2.

As shown in FIG. 2, the truss muscles 5, 5, ... Have a single top muscle 5a and lattice muscles 5b, 5b arranged in a triangular shape, and a gas pipe or the like is provided at the base end of the lattice muscles 5b, 5b. Install the metal tubes 6, 6 ... As shown in FIG. 1, the metal tube 6,
PC steel materials 7, 7 ... are inserted through 6 ...
Bearing portions 8, 8 provided on both sides of the mold 2 on the short side of the mold 2.
Have ... support.

When the half precast concrete board 1 is manufactured, the bearing portions 8, 8 ... Are attached to the PC steel materials 7, 7.
While applying a tensile force, concrete is poured into the mold 2 until the metal pipes 6, 6 ... Thus, a half precast concrete plate in which the prestress of the half precast structure in which the upper portion of the truss reinforcement 5 is exposed is introduced into the mold 2 is manufactured.

FIG. 3 shows another embodiment, in which reference numeral 9 is a truss bar, and the truss bar 9 is used in the manufacture of a half precast concrete board in place of the truss bar 5 used in the above-mentioned embodiments. . The truss muscle 9 is a single top muscle 9
It is composed of lattice muscles 9b and 9b arranged in a triangle from a, and the lower portions of the lattice muscles 9b and 9b are bent to form the P
It is formed so that the C steel materials 7, 7 can be inserted therethrough. By using the truss bars 9, it is possible to manufacture a half-precast concrete plate having a prestress introduced therein with a simpler configuration as in the above-described embodiment.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0013]

As described in detail in the above one embodiment, the present invention replaces the bottom streak disposed at the base end of the lattice streak of the truss rebar used in the conventional half precast concrete plate, and replaces the lattice streak. A metal tube was attached to the base end portion of and the PC steel material was inserted into the metal tube. Then, a tensile force is applied to the PC steel material, and concrete is poured to produce a prestressed half precast concrete plate.

As described above, since a high-strength and lightweight half-precast concrete board can be obtained with a simple structure and manufacturing method, workability such as floor beam work is greatly improved, and further, the construction of a building can be performed. This is an invention that has various kinds of effects, such as economical design and contribution to cost reduction.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view showing another embodiment.

[Explanation of symbols]

 1 Half precast concrete board 2 Formwork 3 Spacer 4 Mesh reinforcement 5,9 Truss reinforcement 5b, 9b Lattice reinforcement 6 Metal tube 7 PC steel material 8 Bearing section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location E04G 21/12 104 A

Claims (2)

[Claims] 1. A half-precast concrete plate used for a flooring for construction, etc., wherein a spacer is arranged on the bottom surface of the half-precast concrete plate, and a mesh streak is placed on the upper part of the spacer, A truss reinforcement is provided along the long side direction of the form on the upper part, and a metal pipe is attached to the proximal end of the lattice reinforcement of the truss reinforcement, and a PC steel material is inserted into the metal pipe to fix the upper part of the truss reinforcement. A half-precast concrete board characterized by being exposed. 2. The PC steel material is supported by supporting both end portions of the PC steel material inserted into a metal tube attached to the proximal end portion of the lattice muscle on a bearing portion provided on the short side of the mold. Pre-stress is introduced by pouring concrete into the mold in a state in which a tensile force is applied in advance and forming so as to bury the PC steel material and the metal pipe from the bottom of the mold. The method for producing a half precast concrete plate according to claim 1.