JPH06108534A - Interconnecting construction of precast beam - Google Patents

Abstract

PURPOSE:To simplify a connecting process as well as to improve the extent of joining accuracy, horizontal bearing force or the like in addition to workability and efficiency, and make a sharp reduction in a construction period achievable. CONSTITUTION:Two narrow connecting ends 1a formed in the end of a precast beam 1 are brought into contact with each other opposingly, and a U-shaped steel plate 3 is fitted in both these connecting ends 1a from the downside and clamped with plural pieces of long bolts 5 for connection. Grout (g) is filled up in a gap between these connecting ends, and a fireproofing coating is applied to the outside of the U-shaped steel plate 3 and the long bolt 5. In this case, after a half part of the U-shaped steel plate 3 is fitted in one side of the connecting ends 1a from the downside, it may be done that the other side of the connecting ends 1a is fitted in the other half part of the U-shaped steel plate 3 from the upside and clamped by these plural pieces of bolts 5 for connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC beam intermediate joining method for joining end portions of a PC beam at an intermediate portion between columns.

[0002]

2. Description of the Related Art Conventionally, an intermediate joining construction method for a PC beam is constructed by installing a PC beam, supporting the ends of the PC beams with an appropriate gap at an intermediate portion between columns and facing each other, and arranging a formwork between the ends. In addition, the beam main bars protruding from both ends are pressure-welded to each other or connected by a metal sleeve, and concrete is cast between the ends of the PC beam to cure it, and then the formwork and the support are removed, A common construction method is to integrally join the ends of the PC beam at the intermediate portion between the columns.

[0003]

The conventional intermediate joining construction method for PC beams is, as described above, the construction of the PC beams, the support of the PC beams, the placement of the formwork, the placing and curing of concrete, the formwork and the support. There is a problem in workability, efficiency, etc. that requires a process such as removal, and the joining process is complicated and requires a lot of labor and time, and a long curing period is required.

The present invention was developed in order to address the above-mentioned problems. The object of the present invention is to simplify the joining process and increase the joining accuracy, horizontal proof strength, etc.
P that improves workability and efficiency and enables a significant reduction in construction period
It is to provide an intermediate joint construction method for C-beams.

[0005]

According to the present invention, a narrow joint end formed at the end of a PC beam is brought into contact with each other, and a U-shaped steel plate is fitted from below to both joint ends to form a plurality of joints. While tightening and connecting with long bolts of this book, by filling grout between both joint ends and applying fireproof coating on the outside of U-shaped steel plate and long bolts, beam supports, formwork, concrete It eliminates the need for on-site casting and curing, simplifies the joining process, and improves joining accuracy and horizontal proof strength. Also, after fitting one half of the U-shaped steel plate from one side to the one of the above-mentioned joining ends and tightening with a plurality of long bolts to attach the other half of the U-shaped steel plate to the other half of the joining end, By fitting from the upper side and tightening and connecting with a plurality of long bolts, the contact and joining of both ends of the PC beam are further facilitated.

[0006]

[Function] The narrow joint ends formed at the ends of the PC beam are brought into contact with each other, and U-shaped steel plates are fitted to both joint ends from below and fastened with a plurality of long bolts for connection. Filling the grout between both joint ends and applying fireproof coating on the outside of the U-shaped steel plate and long bolts, the ends of the PC beams can be easily and quickly intermediate-joined, and the U-shaped steel plate can be fitted and lengthened. The bolt connection greatly simplifies the joining process, enables high-precision intermediate joining, and obtains excellent horizontal proof stress. Effective workability and efficiency are improved, and the construction period can be greatly shortened. Also, after fitting one half of the U-shaped steel plate from one side to the one of the joint ends and tightening with a plurality of long bolts, the other half of the U-shaped steel plate of the joint end is The other side is fitted from above and tightened with a plurality of long bolts for connection, so that it is easier to contact and join the both ends of the PC beam, and excellent workability is obtained.

[0007]

EXAMPLE FIG. 1 (A) (B) (C) shows an example of the present invention. In the figure, 1 is a PC beam (precast concrete beam), 1a is a narrow joint end formed at the end of the PC beam 1, 2 is a plurality of sheaths arranged at the joint end 1a, 3 is a U-shaped steel plate 5 is a long bolt to be inserted into the sheath 2, 6 is a washer, 7 is a nut, 8 is a precision adjusting hardware, 9 is a fireproof coating, g
Is a grout filled between the joint ends 1a,
Beam 1 is a precast concrete beam that has been manufactured in advance in a factory and is reinforced by multiple beam main bars and a large number of hoop bars (not shown). A plurality of sheaths 2 are arranged in the portion 1a as shown in the figure, and a U-shaped steel plate 3 is fitted from below to the joint ends 1a, 1a that are in contact with each other, and a plurality of long bolts 5, washers 6, The structure is such that the nut 7 tightens and connects.

The U-shaped steel plate 3 has a joining end portion 1 facing each other.
a, 1a is formed in a U-shaped cross section to be fitted from below, bolt holes corresponding to the sheaths 2 of both joint ends 1a are arranged, and a proper narrow width with respect to the outer surface of the main body of the PC beam 1. Formed to size. Further, the fireproof coating 9 is formed on the joint ends 1a, 1a.
The outer surface of the U-shaped steel plate 3, the long bolt 5 mounted on the outside of the U-shaped steel plate 3, the long bolt 5, the washer 6, and the nut 7 in a factory or the like, or It is also possible to form the members themselves with refractory materials and eliminate the need for on-site construction. Various materials are applied to the fireproof coating 9 and the precision adjustment hardware 8.

In the embodiment shown in FIG. 1, the PC beams 1 and 1 are erected and the narrow joint ends 1a and 1a formed at the ends thereof are brought into contact with each other, and the precision adjusting hardware is provided between the joint ends 1a and 1a. 8, the U-shaped steel plate 3 is fitted to both joint ends 1a, 1a from the lower side, the long bolt 5 is inserted into each sheath 2, and the U-shaped steel plate 3,
A plurality of long bolts 5, washers 6, and nuts 7 are used to tighten and connect the joint end portions 1a, 1a together.
A grout g is filled between a and 1a to be integrated, a fireproof coating 9 is applied to the outside of the U-shaped steel plate 3 and the long bolt 5, and the fireproof coating 9 is flush with the main body outer surface of the PC beams 1 and 1. PC
It is an intermediate joint construction method for beams.

As described above, the joint ends 1a of the PC beam 1 are contacted with each other, the U-shaped steel plate 3 is fitted from below, and a plurality of long bolts 5 are used.
In addition to the tightening connection by means of the grout g filling between the joint ends 1a, and the fireproof coating 9 on the outside, the end portions of the PC beam 1 are easily and quickly intermediate-joined, and the beam support, the formwork and the concrete are cast on site. , The joining process is remarkably simplified by eliminating the need for curing, and the U-shaped steel plate 3 is used to fit the joining ends 1a from the lower side and the joining ends of the long bolts 5, washers 6 and nuts 7. Due to the tightened connection of 1a and 1a and the interposition of the precision adjustment metal fitting 8, excellent joining accuracy and reliability are obtained, and the horizontal proof strength against bending load is effectively enhanced.

In addition, in the above-mentioned intermediate joining construction method for the PC beam, one half of the U-shaped steel plate 3 is fitted from one side to one of the joining ends 1a of the PC beam 1 and tightened with a plurality of long bolts 5. After that, the other half of the U-shaped steel plate 3 is fitted with the other end of the joining end portion 1a from the upper side, and the intermediate joining construction method of the PC beam is achieved by tightening and connecting with a plurality of long bolts 5. 1
The work of fitting one half of the U-shaped steel plate 3 from one side to one side of a and tightening with the plurality of long bolts 5 is easily performed in advance on the ground or the like, and the other half of the U-shaped steel plate 3 is attached. To the joining end 1a
The work of fitting the other end from above and tightening and connecting with a plurality of long bolts 5 further facilitates the abutting and joining of the joining ends and further enhances the workability.

[0012]

According to the present invention, the narrow joint ends formed at the ends of the PC beam are brought into contact with each other, U-shaped steel plates are fitted to both joint ends from below, and tightened by a plurality of long bolts. Along with the connection, the grout filling between both joint ends and the fireproof coating on the outside of the U-shaped steel plate and long bolts enables easy and quick intermediate joining between the ends of the PC beam, and the beam support, formwork, and concrete site. No striking or curing is required, the connection process is significantly simplified, and high-precision intermediate joining provides excellent horizontal proof stress. Effectively improving workability and efficiency, and significantly shortening the construction period. ing. Also, after fitting one half of the U-shaped steel plate from one side to the one of the joint ends and tightening with a plurality of long bolts, the other half of the U-shaped steel plate of the joint end is By fitting the other from the upper side and tightening and connecting with a plurality of long bolts, the joining and joining of the joining ends of the PC beam can be further facilitated and the workability can be further enhanced.

[Brief description of drawings]

FIG. 1 is a side view (A) and XX showing an embodiment of the present invention.
It is sectional drawing (B) and YY sectional view (C).

[Explanation of symbols]

 1 PC Beam 1a Joint End 3 U-Type Steel Plate 5 Long Bolt 9 Fireproof Coating g Grout

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Hirayama 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Yuki Aoki 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Construction Co., Ltd.

Claims (2)

[Claims] 1. A narrow joint end formed on the end of a PC beam is brought into contact with each other, and a U-shaped steel plate is fitted to both joint ends from below and tightened with a plurality of long bolts for connection. In addition, a grout is filled between both ends of the joint, and a fireproof coating is applied to the outside of the U-shaped steel plate and the long bolt. 2. The intermediate joining construction method for PC beams according to claim 1, wherein one half of a U-shaped steel plate is fitted onto one of the joining ends from the lower side and tightened with a plurality of long bolts to be attached. An intermediate joining construction method for a PC beam, characterized in that the other half of the U-shaped steel plate is fitted with the other one of the joining ends from above and is fastened and connected with a plurality of long bolts.