JPH0447047A - Method for connecting precast column and precast girder - Google Patents

Abstract

PURPOSE:To secure stable strength by mutually connecting the PC steel insertion holes of both a precast column and a precast girder via connecting cylinders for joint sections, placing joint concrete between the column and the girder, and thereby concurrently inserting PC steel members so as to be tightened. CONSTITUTION:Connecting cylinders 20 are inserted into the end section fitting 16 of a precast girder 12 in advance, and the end section of the precast girder 12 is mounted onto the temporary bracket 11a of an erected precast column 11. The PC steel member insertion holes 14 and 15 of both of the precast column 11 and the precast girder 12 are mutually connected via the connecting cylinders 20, and they are temporarily tightened with PC steel members 22 inserted into the insertion holes 14 and 15. In the second place, joint concrete 13 is placed in a joint section, the respective PC steel members 22 are then permanently tightened, so that the precast girder 12 is thereby prestressed while the column and the girder are integrated,. By this constitution, construction can thereby be executed fast and economically.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for connecting precast columns and beams used in horizontal construction of multi-story structures using precast members.

(Prior Art) Conventionally, as a method of connecting a concrete precast column and a precast beam, there is a method as shown in FIG. 4.

In this method, joint concrete 3 is interposed between a precast column 1 and a precast beam 2, and a PCG material 4 is continuously inserted between the two and integrated under tension.

In this type of conventional method, a sheath 5.6 is buried in the precast column 1 and the precast beam 2 in advance, and the end of the precast beam 2 is supported on a temporary bracket 7 extending from the precast column 1. Joint sheath 8 at the joint part
After that, a PC steel material 4 such as a steel rod or strand is inserted into the sheaths 5 and 8.6, and joint concrete 3 is poured, allowing it to solidify. After waiting, the PCII material 4 is tensed, and prestress is applied between the columns and beams 1 and 2, thereby integrating the two.

In addition, in some cases, before placing joint concrete 3,
A method in which columns and beams are assembled in sequence by temporarily tensioning the PCa material 4 with spacers 9 interposed at the joints, and then releasing the temporary tension, removing the spacers 9, and pouring joint concrete 3. is taken.

For the sheaths 5 and 6.8, a so-called spiral-wound tube sheath, which is made by spirally winding a ribbed steel plate into a cylindrical shape, is used, and the diameter of the joint sheath 8 is set to a size that fits into the other two sheaths 5.6. Both ends of the joint sheath 8 are screwed inside or outside both sheaths 5 and 6 to communicate with each other.

(Problem to be solved by the invention) In the conventional connection method as described above, a sheath is used for the joint, so if the joint width becomes small, the conventional sheath cannot be used, and in recent years there has been a demand for connection of small joint widths. However, the problem has arisen that it cannot cope with this problem.

In addition, when applying temporary tension, a spacer is required, which not only requires a lot of effort to install, but also is unstable.
During construction, there was a problem in that diagonal members were required to prevent the building from falling over.

(Means for Solving the Problems) The present invention was made to solve the above-mentioned conventional problems, and its feature is that the precast column and precast beam that are connected to each other have a PC steel insertion hole base. At the same time, the connecting tube for the joint part is embedded and joint concrete is cast between the columns and beams, and the PC steel material is connected to the column and beam through the PC steel insertion hole and the connecting tube. In a precast column and beam connection method that integrates the columns and beams by inserting the PC steel material and tensioning the PC steel material, the PCi of one of the precast columns or beams is
A cylindrical metal joint joint tube is fitted into the end of the PC steel insertion hole so that it can be screwed forward and backward in the longitudinal direction of the PC steel insertion hole, and the precast beam is placed in a predetermined position relative to the precast column. After installation at the connecting position, screw the connecting tube for the joint part toward the opposing PC steel material insertion hole side, and insert the tip of the pipe through a packing made of an elastic material such as rubber to the end of the PCS material insertion hole opening. The purpose is to abut the peripheral edges and connect to the PC steel material insertion holes of the columns and beams.

(Function) According to the method for connecting precast columns and beams of the present invention, after arranging the columns and beams in a predetermined direction, by rotating the joint joints screwed onto either side thereof,
It is screwed to the other side and the tip is pressed against the bangin.

As a result, the PC steel material insertion holes of the precast columns and beams are communicated with each other, and the joint joints also serve as spacers during temporary tensioning later.

(Example) Next, an example of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a joint of precast columns and beams connected by the method of the present invention. In FIG. 0, 11 is a precast column made of concrete, 12 is a precast beam, and 13 is joint concrete cast in place.

A temporary bracket lla for beam connection is provided in advance on the precast column 11 in a protruding manner, and a PC steel material insertion hole 14 is opened through the column in a direction that crosses the column in the horizontal direction. This PCmCm through-insertion hole 14 is formed by embedding a commonly used sheath 14a such as a spirally wound tube.

A PC steel material insertion hole 15 is opened through the precast beam 12 in the longitudinal direction.

This PC steel material insertion hole 15 is connected to a sheath 15a of a spirally wound pipe or the like.
The end fittings 16 are embedded in the precast beam 12 and molded. The end fitting 16 consists of a steel pipe 16a and a nut 16b welded to the tip thereof.The nut 16b side is exposed on the end surface side of the precast beam 12,
The end of the sheath 15a is fitted onto the outer periphery of the distal end of the sheath 6a.

A concave portion 17 is formed on the end face of the precast beam 12, and a nut 16b is embedded and fixed in the deep part of the concave portion 17.

Inside the end fitting 16, there is a joint tube 20 screwed into the nut 16b. IA@ is inserted. The connecting cylinder 20 is formed into a cylindrical shape from a metal material such as gunmetal, and has a male thread 20a on its outer periphery that fits into the nut 16b.
is engraved.

Further, the outer periphery of the distal end of the connection f@20 is integrally provided with a polygonal rotation operating portion 20b into which a rotary tool such as a pipe wrench or spanner can be fitted.

The tip of the connecting cylinder 20 is pressed against the opening peripheral portion of the PC steel material insertion hole 14 of the precast column 11 via a rubber packing 21 .

The joint concrete 13 is cast on-site by embedding the connecting pipe 20, and inserts the PC steel material 22 into both the PC steel material insertion holes 15, 16 communicated by the connection FJ20, and inserts the PC steel material 22 into the back side of the precast beam 11. The pillars and beams are tensioned to apply prestress to the entire structure, and the ends are fixed with fixing fittings 23 to integrate the pillars and beams.

Next, we will discuss the connection process of this connection part.The connection f120 is inserted in advance into the end fitting 16 of the precast beam 12, and the end of the precast beam 12 is placed on the temporary bracket lla of the precast column 11 that is erected. Support it and hang it horizontally.

Next, insert a tool into the joint and rotate the connecting tube 20.
Move it to the precast column 11 side. Precast column 1
1, a packing 21 is attached to the periphery of the end of the PC steel material insertion hole 14.
is attached, and the connecting cylinder 20 is screwed until it comes into pressure contact with the surface of the packing 21.

In this way, the precast column and beam 11. After the PC steel material insertion hole 14.15 at t2 is connected through the connecting tube 20,
Insert the PC steel material 22 into them, and
Tentatively tense at the back of 1.

This temporary tension connects the precast columns and beams 11 and 12 f! Temporarily fasten through 1li20.

Next, pour joint concrete 13 into the joint, wait until the strength of the concrete reaches a certain level, and then
The steel material 22 is fully tensioned to impart necessary prestress to the precast beam 12, and at the same time, the columns and beams are integrated.

In addition, the above-mentioned embodiment shows the case where the connecting tube is screwed onto the precast beam side, or conversely, the connecting tube may be screwed onto the precast column side.

(Effects of the Invention) As described above, in the method for connecting precast columns and beams of the present invention, a connecting tube is screwed into either side of the PC steel insertion hole where the columns and beams are to be communicated with each other so as to be able to move forward and backward. ,
After the precast beam is erected, the connecting tube is screwed forward to form the PC steel insertion hole at the joint, making it easy to insert the connecting tube between the columns and beams even in joints that are too narrow to handle. It is now possible to do so.

In addition, with the present invention, the connecting tube can also be used as a spacer for temporary fixing, and since it is screwed into either column or beam, stable strength can be obtained, and temporary fixing can be done easily. This eliminates the need for spacers and diagonal members to prevent falls, allowing for quick and economical construction.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a column-beam connection constructed according to the present invention;
FIG. 2 is an enlarged sectional view of the same part, FIGS. 3(A) to 3(C) are sectional views of the construction process, and FIG. 4 is a sectional view of a conventional example. 11... Precast column, lla...
Bracket, 12... Precast beam 13... Joint concrete, 14.15... PCaCa through hole 4a, 15
a... Sheath, 16... End fitting, 1
6a...Steel pipe, 16b...Nut 20...Connection tube, 20a...Male thread, 20b...Rotary operation section, 21. ...Patsukin, 22...PCgA material, 23...
・Fixing metal fittings. Patent applicant Oriental Construction Co., Ltd. Agent Patent attorney 1) Masao Naka Figure 2 Figure 3 (A) Figure 3! ! I (b) Special 1' Figure 3 (c)

Claims (1)

[Claims] P of precast columns and precast beams connected to each other
The C steel material insertion holes are connected via joint connection tubes, and joint concrete is cast between the columns and beams by embedding the joint connection tubes, and the PC steel insertion holes and connection tubes of the columns and beams are connected. In a method for connecting precast columns and beams, in which a precast steel material is inserted continuously into the precast column and the beam is tensioned to integrate the columns and beams, a cylindrical shape is provided at the end of the PC steel material insertion hole of one of the precast columns or beams. A metal connecting tube for the joint portion is fitted in the longitudinal direction of the PC steel material insertion hole so that it can be screwed forward and backward, and after installing the precast beam at a predetermined connection position with respect to the precast column, Screw the connecting tube toward the opposing PC steel material insertion hole,
The precast column is characterized in that its tip is brought into contact with the periphery of the opening end of the prestressed steel material insertion hole through a packing made of an elastic material such as rubber, thereby connecting the prestressed steel material penetration holes of the column and beam to each other. , how to connect beams.