JPH05133040A - Joining method for precast concrete member - Google Patents

Abstract

PURPOSE:To facilitate the assembling of precast concrete members through the frictional join of prestressed concrete by putting a joining member composed of a prestressed precast concrete member upon a main member, inserting PC steel member in a direction perpendicular to a joining face, and then tightly fastening the above members. CONSTITUTION:A joining member 1 composed of a prestressed precast concrete member and a main member 2 serving as a chord member for a truss or a floor plate are piledly connected through a receiving member 3. PC steel member 4 is inserted in a direction perpendicular to a joining face and tightly fastened to assemble the joining member 1 and the main member 2 through the frictional join of prestressed concrete. Next, mortar is charged in a clearance W between joining members to unite them. Thus, the site placing work can be eliminated to facilitate assembling work and to prevent the occurrence of secondary force in the whole structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining precast concrete members constituting a truss or the like.

[0002]

2. Description of the Related Art Conventional methods for joining precast concrete members include the following three methods.

As the first method, after arranging the members, joint concrete is placed and solidified at the joints. With this method, the dimensional error of the member can be absorbed at the joints, but it takes time for the concrete to harden, and prestress is introduced after the member is assembled, so that static force is generated.

As a second method, the respective members are joined with an adhesive. With this method, the assembly work is simple, but the dimensional error of the members cannot be absorbed. Moreover, since prestress is introduced after assembling the members, the prestress cannot be effectively utilized.

As a third method, each member is joined by using a splicing plate, and the traces are buried. This method also requires the construction of cast-in-place concrete as in the case of the first method, and causes the same drawbacks.

The present invention was developed to address the above-mentioned conventional problems, and is a method particularly suitable for joining precast concrete members using high strength concrete.

[0007]

The joining method of the present invention comprises:
The joining member and the main material are made of precast concrete members to which prestress has been introduced in advance. The joining member and the main material are overlapped with each other, and the PC steel material is inserted in the direction orthogonal to the joining surface to tighten the joining member and the main material. Are assembled by frictional joining by prestressing, and a clearance is provided between the joining members in advance so as to fill them with a filler so as to act integrally as a whole.

[0008]

The details of the present invention will be described below with reference to the illustrated embodiments.

The present invention is implemented, for example, in a prestressed concrete truss structure. Then, the joining member 1 serving as a truss member and the main member 2 serving as a truss chord member or a floor slab are joined, each of which is made of a precast concrete member into which prestress is introduced.

A receiving portion 3 is provided on the main material 2 in a protruding manner. The joining member 1 and the main member 2 are frictionally joined to the joining member 1 and the main member 2 by prestressing by inserting the PC steel material 4 in the receiving portion 3 in a direction orthogonal to the lap joining surface and tightening the same. Assemble. Further, a play gap W is provided in advance between adjacent joining members, and after joining the joining members 1, a filling material such as mortar is filled in the gap W, and a dowel is provided so as to be integrated with respect to the subsequent load. Let it work.

[0011]

EFFECTS OF THE INVENTION The present invention has the above-mentioned constitution, and joining of precast concrete members such as joining members and main materials
As it is assembled by friction joining of concrete by prestressing of PC steel placed in the right angle direction, there is no in-situ casting part, assembly is easy, and prestressing by joining steel does not generate secondary force in the entire structure. .

Further, at the time of assembly, the shearing force is transmitted by frictional joining, and then the filler is filled in the free space of the joining portion so that it acts as a unit against the load thereafter, so that the total proof stress is different from that produced integrally. Disappear.

Further, by providing a play gap between the joining members in advance, it is possible to easily absorb a dimensional error when joining the members,
Assembly of truss beams with camber is easy.

In general, the cast-in-place portion has lower concrete strength than the precast portion, but since the structural system can be assembled only by the precast member, the characteristics of the high-strength concrete can be fully utilized.

Further, by reducing the member size, it is possible to reduce the weight.

[Brief description of drawings]

FIG. 1 is a detailed view of a joint part, (a) is a front view and (b) is a sectional view.

FIG. 2 is a front view of each member, in which (a) is a main material and (b) is a joining member.

FIG. 3 is a front view of a truss beam in an assembled state.

[Explanation of symbols]

1 ... Joining member, 2 ... Main material, 3 ... Receiving part, 4 ... PC steel material, 5
… Filling material.

Claims (2)

[Claims] 1. A pre-cast concrete member is preliminarily provided with a play gap between the joining members, and the joining member and the main member made of the precast concrete member are overlapped and tightened by inserting a PC steel material in a direction orthogonal to the joining surface. Thus, the joining member and the main material are assembled by friction joining of concrete by prestressing, and then the play gap is filled to directly transmit the shearing force between the truss members. 2. A prestress is introduced into each precast concrete member in advance.
A method for joining precast concrete members as described above.