JPH0552002A - Precast slab - Google Patents

Abstract

PURPOSE:To provide a thin PC slab having high bending strength and crack recoverable property. CONSTITUTION:Tension is given to high strength organic fiber 5. Mortar or concrete is placed under this condition. After hardening, traction bolts 11 to attract the high strength organic fiber 5 are removed. Namely, a PC slab 15 involving the high strength organic fiber in abond tension is introduced is formed. Consequently, because of prestressed PC slab given pretension, the bending strength is high and crack recoverable property is excellent. Further, because of a thin wall PC slab, a small tension is sofficient there to and the high strength organic fiber can be used in form of textile fabric. Hereby sticking area is wide, and a fixing tool or working on the fiber are not reguired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prestressed panel using a high-strength organic fiber containing aramid fiber, carbon fiber, etc. as a tension material, and is a relatively thin precast plate particularly used for a driving form plate or curtain wall plate. Regarding

[0002]

2. Description of the Related Art A precast plate (hereinafter abbreviated as a PC plate) using a conventional high-strength organic fiber is used to cast mortar while long fibers are naturally entwined in a three-dimensional manner or short fibers are mortar. Was mixed in. Hundreds of fibers are bundled and impregnated with an epoxy resin adhesive to be hardened into a rod shape, or hardened into a strand shape and fixed at both ends with a fixing tool having a fiber protection function. It was a prestressed concrete slab.

[0003]

However, the high-strength organic fiber has extremely high tensile strength, and it is not sufficient to utilize its performance sufficiently by simply mixing it in mortar or by mixing them together. There wasn't. Further, when it is used as a prestressing tension material, there is an advantage that the performance can be utilized, but there are problems in the processing cost and the structure of the fixing tool.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an optimal precast by imparting an optimum tension force to a thin-walled PC plate, and to eliminate the conventional drawbacks. To provide.

[0005]

In order to achieve the above object, the PC plate of the present invention is a precast plate such as a relatively thin driving form plate or curtain wall plate which is used as a part other than the structural material or as a part of the structural material. In the above, the precast panel is characterized in that the end portions of the high-strength organic fiber woven planarly or three-dimensionally are sandwiched and fixed, and a tension is applied and introduced into this, and mortar or concrete is cast.

[0006]

The pulling end of the high-strength organic fiber is pulled to introduce tension into the fiber. Since this tension is intended to increase the bending strength of the high-strength mortar, it is sufficient if a tension about half the tensile strength of the long fibers can be applied. Further, if the long fibers are arranged so that the eccentric moment acts, it becomes more advantageous for the bending strength.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a state before placing mortar or concrete. First, in order to introduce a tension force, the reaction force plates 3-3a are arranged at regular intervals on the pedestal 1 also serving as a mold having a strength capable of withstanding the tension reaction force, and at an opposing interval corresponding to the width of the PC plate. It is provided. Reaction plate 3-3
a is a high-strength organic fiber 5 between two plate materials stacked one above the other.
Tightening bolt 7 is passed from the upper plate material to the lower plate material so as to sandwich. That is, a through hole for the bolt 7 is provided in the upper plate member, and a screw hole for screwing the bolt 7 is formed in the lower plate member portion that abuts the bolt 7 immediately below the hole. Also, the plate material under one of the reaction force plates 3 is fixed to the base 1 with bolts 9,
The plate material under the other reaction force plate 3a has a pulling bolt 11 on its outer surface so that it can be pulled in the opposite axial direction of the opposing reaction force plate 3.
The joint member 13 is threadedly mounted, and if necessary, the joint member 13 mounted in parallel between adjacent traction bolts 11 and the like is passed through the bolts 11 and fixed with nuts. That is, the joint material 13 simultaneously pulls the tow bolts 11 by pulling the joint material 13. Next, the high-strength organic fiber 5 is sandwiched and fixed to the reaction force material 3-3a, and the other reaction force material 3a or the joint material 13 is pulled with a jack or the like at the position of the tow bolt 11 to form the high-strength organic fiber 5. Apply tension. Since this PC plate is thin, the tension effect is sufficient even if the tension force is small. Then, as shown in FIG. 2, mortar is cast, the traction state for tensioning the high-strength organic fiber 5 is released after the aging period (which may be concrete), and the traction bolt 11 is removed.
Therefore, a pretensioning type prestressed panel using the high-strength organic fiber 5 is obtained. That is, this PC version 15
Is a prestressed panel.

[0008]

As described above in detail, the P of the present invention
According to the C plate, the application is a thin-walled PC plate such as a formwork plate or curtain wall plate, and the woven fabric of high-strength organic fiber is used as it is as a tension material for pretensioning, so a tension effect can be obtained with a relatively small tension force. In addition to being able to secure the strength, it is possible to increase bending strength and realize weight reduction by devising the fiber arrangement. Further, unlike the conventional tension material, it does not have a rod shape, and therefore has a large adhesion area and does not require a fixing tool. Further, it is not necessary to carry out the hardening process of the tension fiber with an epoxy resin or the like, which has been carried out to prevent deformation and hold the position when the mortar or concrete is poured. As a result, the high-strength characteristics of the organic fiber can be fully utilized in the woven fabric as it is, and there is an effect that a PC plate having a high bending strength and a large crack recovery property can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which high-strength organic fibers for tension are stretched in the present invention.

FIG. 2 is a cross-sectional view of a PC plate according to the present invention.

[Explanation of symbols]

 1 pedestal 3 reaction plate 5 high-strength organic fiber 7 tightening bolt 9 bolt 11 traction bolt 13 joint material 15 PC version

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI Technical display location E04B 2/94 6951-2E E04C 2/06 7904-2E

Claims (1)

[Claims] 1. A precast plate, such as a relatively thin driving form plate or curtain wall plate, which is used as a part of a structural material or other than a structural material, in which an end portion of a high-strength organic fiber woven planarly or three-dimensionally is used. A precast plate characterized by being a precast panel in which mortar or concrete is placed by sandwiching and fixing, applying tension to this, and placing mortar or concrete.