JP2000129802A - Joint construction for prefabricated member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent the occurrence of cracking near coupling fittings because a buffering member can be tightly adhered to both of a jointing surface of a prefabricated member and the front plate of the coupling fittings and thus the occurrence of a gap between the front plate and the jointing surface can be prevented and therefore a tensile force to the coupling fittings does not act to a main body even when the coupling member is tightened. SOLUTION: A plurality of prefabricated members 1 embedded in the main body 2, in such a manner that the coupling fittings 3 having the rigidity for jointing together the prefabricated members 1 each other can be exposed at the plate 31a to the jointing surface 2a of the prefabricated member 1, are jointed together by tightening and jointing together the coupling fittings 3 of neighboring prefabricated members 1 with coupling members. In this case, a buffering member having elasticity for tightly adhering commonly to both of respective jointing surface 2a and respective front plate 31a of the prefabricated members to be jointed are interposed between the prefabricated members 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of a prefabricated member such as a wall material, a flooring material, a column material, a beam material and the like of a concrete product produced in a factory and a joining method thereof.

[0002]

2. Description of the Related Art Conventionally, there is a circular prefabricated tank as a small-scale sewage treatment facility provided for treating sewage. When such a circular prefabricated tank is constructed, by joining and constructing such a plate-shaped prefabricated member, high strength and sealing properties are ensured without incurring complicated work on site. . Such a prefabricated member has joint surfaces on both side surfaces thereof, and a rigid connection fitting for exposing the front plate to the joint surface is embedded inside for joining.
The connection fitting includes a rectangular parallelepiped box having a front plate, and a fixing member for fixing the box in the prefabricated member.

[0003] In the tightening connection, the joining surface of each prefabricated member and the front plate of the connecting fitting are brought into close contact with each other so that no gap is formed between adjacent prefabricated members.
The connection fittings are tightly connected by bolts.

[0004]

By the way, when the front plate of the connecting fitting is not flush with the joint surface of the prefabricated member during the manufacture of the prefabricated member, that is, the front plate may be depressed or protruded from the joint surface. is there. For example, when joining a prefabricated member whose front plate is depressed from the joint surface and a prefabricated member whose front plate is substantially flush with the joint surface, when the joint surfaces of adjacent prefabricated members are brought into close contact with each other, the front plates are joined together. There may be gaps between them. As described above, when the bolt is tightened in a state where the gap exists, the connecting member is pulled toward one of the connecting fittings in the prefabricated member. As a result, cracks may occur at the boundary between the corner of the connection fitting and the concrete portion of the prefabricated member. However, it may be difficult to completely eliminate the depression and protrusion of the front plate during manufacturing.

Similarly, when foreign matter is caught between the joining surfaces of adjacent prefabricated members at the time of construction, a similar problem may occur because a gap is formed between the front plates. An object of the present invention is to solve such a problem.

[0006]

In order to achieve the above object, the present invention takes the following measures. In other words, the joining structure of the prefabricated member according to the present invention, when joining the prefabricated member in which the connection fitting having the front plate is embedded, includes a buffer member that is in close contact with both the joining surface of the prefabricated member and the front plate. It is a configuration in which it is interposed and joined.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method of forming a plurality of prefabricated members, each having a rigid connecting member for joining the prefabricated members embedded in a main body such that a front plate thereof is exposed to a joint surface of the prefabricated members. In the joining structure of the prefabricated members joined by tightly joining the connecting metal fittings of the adjacent prefabricated members with the joining member, both of the joint surfaces of the joined prefabricated members and the respective front plates are in close contact with each other. A joining structure of prefabricated members, characterized in that a buffer member having elasticity is interposed between the prefabricated members.

With such a configuration, since the cushioning member is in close contact with both the joint surface of the prefabricated member and the front plate of the connection fitting, no gap is formed between the front plates. Therefore, even if the connecting member is tightened, no tensile force acts on the connecting member to the main body, and no crack is generated around the connecting member. In order to efficiently perform the tightening work of the connecting member, the connecting fitting has a rectangular parallelepiped box having a through hole through which the connecting member is inserted in the front plate surface, and the box is fixed in the prefabricated member. And a fixing member of the above. Further, by providing the fixing member, the tightening force of the connecting member can be effectively applied to the prefabricated member main body.

The cushioning member is preferably made of rubber. As such rubber, water-swellable rubber or sponge rubber can be used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The prefabricated member 1 shown in FIG. 1 is made of concrete for constituting a wall of a circular prefabricated tank, and is formed in a curved plate shape. This prefabricated member 1
Consists of a main body 2 made of concrete and a connecting metal fitting 3 made of, for example, steel.
Front plate 31 of connection fitting 3 substantially flush with joint surfaces 2a on both sides
The connecting fitting 3 is embedded in the main body 2 so that a is exposed. In this embodiment, the connection fitting 3 is connected to the main body 2.
Are embedded in three steps on the front side and two steps on the back side so as to be located at a height between the three steps on the front side. The lower edge of the main body 2 is provided with a notch 2b for accommodating a reinforcing bar 4a erected on the bottom slab 4 for fixing the prefabricated member 1 to the bottom slab 4 of the circular prefab tank. Regarding the method of manufacturing the prefabricated member 1 and the method of fixing the prefabricated member 1 to the bottom plate 4,
Since various techniques well known in the art can be applied, the description is omitted.

The connection fitting 3 has a front plate 31a provided with a through hole 31b for inserting the high-strength bolt 5 serving as a connection member at substantially the center thereof, and a rectangular parallelepiped box body opened on the surface of the main body 2. 31 and a fixing member 3 fixed to the box 31
2 is provided. The box body 31 includes a main body 31c and a front plate 31a fixed so as to be integrated with the main body 31c by welding or the like. One side is opened, and the nut 6 is screwed onto the high-strength bolt 5. You can wear it. The front plate 31a is tightened by the high-strength bolt 5 in a direction in which the front plate 31a comes close to each other. Therefore, a member thicker than the main body 31c is used to prevent deformation due to the tightening force.

The fixing member 32 is fixed to the upper and lower outer surfaces of the box body 31 by welding or the like. For example, a steel rod is bent in a U-shape so that both ends are separated from each other, and one end 32a is formed.
Is fixed to the upper outer surface of the box 31 and the other end is fixed to the lower outer surface of the box 31. The bent portion 32c is projected outward of the box 31 in a direction opposite to the front plate 31a of the box 31. The fixing member 32 having such a shape is the main body 2.
Buried in the concrete of the front plate 31
When a tightening force is applied to “a”, the tightening force is transmitted to the main body 2.

The box 31 having such a structure is provided with the fixing member 3.
2 in a substantially horizontal direction and further away from the joint surface 2a
Embedded in the main body 2 in the width direction. In this case, the embedding position of the front plate 31a is determined so that the surface of the front plate 31a is substantially flush with the joint surface 2a, and the opening of the box body 31 is substantially flush with the front and back surfaces of the main body 2. . In joining the prefabricated member 1, first, a water-swellable rubber 7 as a cushioning member is stuck on the entire joining surface 2 a of the prefabricated member 1. The water-swellable rubber 7 may have a thickness capable of absorbing foreign substances existing between the joining surfaces 2a at the time of joining or irregularities from the joining surface 2a of the front plate 31a. Next, the prefabricated member 1 connected to the prefabricated member 1 on which the water-swellable rubber 7 is attached is arranged at a predetermined position on the bottom plate 4, and the joining surface 2a of the prefabricated member 1 facing the water-swellable rubber 7 is The prefabricated member 1 on which the water-swellable rubber 7 is adhered is brought close to the water-swellable rubber 7 until it comes into close contact with the water-swellable rubber 7. Thereafter, the high-strength bolt 5 is inserted into the through hole 31b of the front plate 31a of each prefabricated member 1 to be joined, and the nut 6 is screwed and tightened. Thereafter, the water-swellable rubber 7 is expanded to eliminate gaps between the respective prefabricated members 1 and concrete is poured into the cutouts 2b, and the respective prefabricated members 1 and
Fixed to.

According to such a configuration, the water-swellable rubber 7 is in close contact with both the joint surface 2a of each prefabricated member 1 and the front plate 31a of the connection fitting 3, and between the prefabricated members 1, It will intervene. Therefore, when the high-strength bolt 7 is tightened, there is no gap between the joint surface 2a and the front plate 31a, and the prefabricated members 1,
1 is connected to the other prefabricated member 1
No side pull. For this reason, the connecting fitting 4 does not pull the main body 2 of the prefabricated member 1 at the four corners, and the tensile stress does not partially concentrate on the concrete. Therefore, the connection fitting 4
Cracks starting from the corners can be prevented.

Since the occurrence of cracks can be prevented by interposing the water-swellable rubber 7 in this manner, the work of filling the cracked portions with mortar can be eliminated, and the process can be shortened. Thereby, the main body 2
Since the portions having different colors can be eliminated, the appearance can be improved and the reliability can be improved. In addition, in the joint portion of each prefabricated member 1,
Since the gap is completely eliminated by the water-expandable rubber 7,
The watertightness of the circular prefab tank can be improved. In addition, since the water-swellable rubber 7 is interposed between the prefabricated members 1, the allowable accuracy of the finished accuracy of the flat surfaces of the respective joint surfaces 2 a of the prefabricated members 1 and the allowable accuracy of the finished accuracy in burying the connection fitting 3 are reduced. Can be. Therefore, manufacturing of the prefabricated member 1 becomes easy.

The present invention is not limited to the embodiment described above. Instead of the water-swellable rubber as the cushioning member, a sponge rubber may be used. In addition, the configuration of each unit is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0017]

As described above, according to the present invention, since the cushioning member is in close contact with both the joint surface of the prefabricated member and the front plate of the connecting fitting, it is possible to prevent a gap from being formed between the front plates. Can be. Therefore, even if the connecting member is tightened, the pulling force does not act on the main body of the connecting metal, and it is possible to effectively prevent cracks from being generated around the connecting metal.

[0018] The connecting fitting includes a rectangular parallelepiped box having a through-hole for inserting the connecting member in the front plate surface, and a fixing member for fixing the box in the prefabricated member. If this is the case, the tightening work of the connecting member can be made more efficient. Further, by providing the fixing member, the tightening force of the connecting member can be effectively applied to the prefabricated member main body.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention.

FIG. 2 is a perspective view showing a connection fitting of the embodiment.

FIG. 3 is an enlarged sectional view of a main part of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Prefabricated member 2 ... Main body 3 ... Connection metal fitting 5 ... High-strength bolt 6 ... Nut 7 ... Water-expandable rubber

[Procedure amendment]

[Submission date] September 27, 1999 (September 9, 1999
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a method of forming a plurality of prefabricated members, each having a rigid connecting member for joining the prefabricated members embedded in a main body such that a front plate thereof is exposed to a joint surface of the prefabricated members. In the joining structure of the prefabricated members joined by tightly joining the connecting metal fittings of the adjacent prefabricated members with the joining member, both of the joint surfaces of the joined prefabricated members and the respective front plates are in close contact with each other. the cushioning member having elasticity be those to be interposed between the prefabricated members, all of the joint surface joined when
This is a joining structure of a prefabricated member, wherein a cushioning member is attached to a surface .

Claims (4)

[Claims] A plurality of prefabricated members are embedded in a main body such that a rigid connection metal fitting for joining the prefabricated members is exposed to the joining surface of the prefabricated members. In the joining structure of the prefabricated members joined by tightly joining the joining fittings with the joining members, an elastic buffer member having a common and close contact with both the joining surfaces of the joined prefabricated members and the respective front plates is provided. A joining structure for a prefabricated member, wherein the joining structure is interposed between the prefabricated members. 2. A connection fitting comprising: a rectangular parallelepiped box having a through-hole for inserting a connection member in a front plate surface; and a fixing member for fixing the box in a prefabricated member. The structure for joining prefabricated members according to claim 1, characterized in that: 3. The joint structure for prefabricated members according to claim 1, wherein the cushioning member is made of rubber. 4. The joint structure for a prefabricated member according to claim 1, wherein the rubber is a water-swellable rubber or a sponge rubber.