JPS6347452A - Joint structure of pillar reinforcing bar - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a joint structure for column reinforcing bars, and particularly to a joint structure for column reinforcing bars suitable for application to columns of high-rise buildings.

(b), conventional technology Usually, multiple core reinforcing bars are placed in the center of the column.

When arranging a plurality of peripheral reinforcing bars to surround them, it is necessary to connect adjacent core reinforcing bars and peripheral reinforcing bars via mechanical joints along the axial direction of the column. A machine that connects peripheral reinforcing bars, 1! Hands can be tightened sufficiently using tools.

However, the mechanical joint that connects the core reinforcing bars is obstructed by a plurality of outer reinforcing bars, and cannot be tightened using tools, so the joint must be tightened by hand.

This makes it impossible to exhibit sufficient joint strength.

Conventionally, the core reinforcing bars to be connected are first lifted up by a crane or manually connected to the core reinforcing bars that have already been arranged via mechanical joints, and the mechanical joints are tightened. 1. Next, use the crane again to lift up the existing peripheral reinforcing bars, and connect them to the already arranged peripheral reinforcing bars via mechanical joints. was working.

(C) 0 Problems to be solved by the invention However, this method requires the amount of core steel movement to be connected and the joints between the outer reinforcing bars.
The crane would have to be used twice, which would require more time and effort to construct the pillars.

In order to eliminate the above-mentioned drawbacks, the present invention aims to reduce the amount of core steel movement to be connected and the number of times a crane is used for joints between peripheral reinforcing bars, thereby making it possible to efficiently construct column reinforcing bars. The purpose is to provide a joint structure for reinforcing bars.

(d) Means for solving the problem of zero spacing, that is, the present invention provides a grout joint (
6a), and the outer reinforcing bars (2, 2) are joined via a mechanical joint (3a).

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. r(e) below,
The same applies to the column "Effect".

(e) 1 Effect With the above configuration, the present invention connects the core reinforcing bars (5, 5) between the peripheral reinforcing bars (2, 2) by injecting the grout material (9) into the grout joint (6a). Mechanical joints (3)
It acts as per a).

(f), Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing an embodiment of a joint structure for column reinforcing bars according to the present invention, FIG. 2 is a cross-sectional view showing a joint portion of peripheral reinforcing bars, and FIG. 3 is a cross-sectional view showing a joint portion of core reinforcing bars. .

As shown in FIG. 1, the column 1 has a plurality of peripheral reinforcing bars 2 that are erected in the direction perpendicular to the plane of the paper in FIG. At each end 2a of
As shown in FIG. 2, a joint part 3 is provided. In the joint part 3, upper and lower peripheral reinforcing bars 2, 2 adjacent to each other along the length of the column 1 are arranged in a straight line with their respective end surfaces 2b, 2b facing each other, and the outer peripheral reinforcing bars 2 A male thread 2c is formed at each end 2a. Further, one mechanical joint 3a is engaged with each end 2a of the outer peripheral reinforcing bar 2,
The mechanical joint 3a has a cylindrical coupler 3b. A female thread 3d is screwed on the inner peripheral surface 3c of the coupler 3b, and the male threads 2c, 2c formed at each end 2a of the above-mentioned adjacent upper and lower outer peripheral reinforcing bars 2.2 are screwed into the female thread 3d. are doing. Moreover, the lock nuts 3e, 3e constituting the mechanical joint 3a are attached to the coupler 3b on the pheasant screws 2c, 2c.
It is screwed into contact with both end surfaces 3f of.

On the other hand, a core reinforcing bar 5 is provided at the center of the column 1 surrounded by these outer reinforcing bars 2, as shown in FIG. , a connecting portion 6 is provided at the end portion 5a of the core reinforcing bar 5, as shown in FIG. In the connecting portion 6, upper and lower core reinforcing bars 5.5 adjacent to each other along the axis of the column 1 are arranged in a straight line with their respective end surfaces 5b, 5b facing each other, and the core reinforcing bars 5.5 A male screw 5c is formed at each end 5a of the screw 5.

Furthermore, each end 5a of the core reinforcing bar 5 is provided with
A grout joint 6a proposed in No. 531 and Japanese Utility Model Publication No. 52-7943 is engaged, and the grout joint 6a has a cylindrical sleeve 6b. sleeve 6
A female thread 6d is screwed on the inner circumferential surface 6c of b, and each end 5a of the adjacent upper and lower core reinforcing bars 5.5
The male screws 5c, 5c formed in are screwed together. Further, lock nuts 6e, 6e are screwed into the male screws 5c, 5c so as to come into contact with both end surfaces 6f of the sleeve 6b. Furthermore, a grout injection hole 6g is formed in a substantially central portion of the outer peripheral surface of the sleeve 6b in a manner that opens to the inner peripheral surface 6c, and a grout injection space 6h in the sleeve 6b communicates with the injection hole 6g. A grout material 9 such as adhesive is injected and filled.

Also, around the peripheral reinforcing bars 2 and core reinforcing bars S.

Concrete 7 is poured to form the outer shape of the column 1.

Since the column 1 has the above-mentioned configuration, in order to construct the column 1, first, the outer reinforcing bars 2 and the core reinforcing bars 5 are tied together with hoop reinforcements (not shown) and assembled together. The outer reinforcing bars 2 and the core reinforcing bars 5 assembled into a cylindrical shape are hung by a crane or the like and transported to a construction site where reinforcement for the columns 1 is to be arranged. A peripheral reinforcing bar 2 and a core reinforcing bar 5 are formed in a strip shape.

After being carried up to the construction site, the outer reinforcing bars 2
And each end surface 2b-5b of the core reinforcing bar S is positioned at a position facing each end surface 2b, 5b of the outer peripheral reinforcing bar 2 and the core reinforcing bar 5 that have already been reinforced. next.

Peripheral reinforcing bars 2 and core reinforcing bars 5 positioned at opposing positions
To the male thread 2C15C formed on each end 2a, 5a of,
9. Screw nuts 3e and 6e together, and turn arrow A.
Alternatively, rotate it appropriately in direction B and screw it into each male screw 2c, 5c sufficiently.

Next, the female threads 3d of the coupler 3b are screwed into each of the ΔL wood screws c of the upper and lower outer peripheral reinforcing bars 2.2, and the screws are screwed in until the end surfaces 2b, 2b are close to each other. In this state, rotate the lock nuts 3e, 3e screwed into each male screw 2c in the opposite direction.

It is brought into contact with the end faces 3f, 3f of the coupler 3b. When each lock nut 3e comes into contact with each end surface 3f of the coupler 3b, tighten the lock nuts 3e, 3e by pressing each end surface 3f using a tool, and tighten the female thread 3d of the coupler 3b and the male thread of the outer peripheral reinforcing bar 2. To eliminate the backlash in the vertical direction in FIG. 2 of the screw that occurs between 2c and 2c. Thereby, the peripheral reinforcing bars 2, 2 are firmly connected via the mechanical joint 3a.

Similarly, the sleeve 6b is screwed onto each of the male threads 5c, 5c of the upper and lower core reinforcing bars 5.5 until the end surfaces 5b, 5b approach each other. In this state, a quickly hardening grout material such as an epoxy resin adhesive is injected through the grout injection hole 6g of the sleeve 6b, and the grout material 9 is bonded to the core iron fa.
The grout injection space 6h formed from the gap between the male screw 5c of S and the female screw 6d of the sleeve 6b is filled.

In addition, before or after pouring the grout, lock nut 6
Tighten e and 6e by hand. The grout material 9 injected in this manner solidifies within the injection space 6 and firmly connects the core reinforcing bars 5.5 via the sleeves 6b and the like.

Incidentally, the operation of injecting grout from the injection hole 6g is possible simply by reaching the tip of a grout injection device (not shown) to the relevant part of the joint 6a, so that the outer reinforcing bars 2 are densely arranged, as shown in FIG. This can be easily done even in the situation shown in .

In this way, the upper and lower outer peripheral reinforcing bars 2.2 and the core reinforcing bars 5, 5 that are adjacent to each other along the axial direction of the column 1 are connected by connecting the pre-assembled reinforcing bars that are integrally formed. Column 1 will be constructed, and as mentioned above, mechanical joints 3a can be used to ensure sufficient joint strength between outer reinforcing bars 2 and 2, and grout joints 6 are used between core reinforcing bars 5 and 5.
Since the joints 3.6 and 3.6 are firmly connected, each joint 3.6 can achieve sufficient joint strength.

In this way, when the peripheral reinforcing bar 2 and the core S are connected,
Place concrete 7 around the reinforcing bars 2 and 5,
Build Pillar 1.

In this embodiment, the case has been described in which the pheasant screws 2c and 5c are formed at the ends 2a and 5a of the outer reinforcing bar 2 and the core reinforcing bar S, respectively.

The shape of each reinforcing bar 2.5 is not limited to this, but 1
For example, it goes without saying that male threads may be formed along the entire length of the outer reinforcing bar 2 and the core reinforcing bar 5. Core reinforcing bar5.
5 are connected through a grout joint 6a, and the vertical outer peripheral reinforcing bars 2, 2 are connected through a mechanical joint 3a.

Connect between core reinforcing bars 5.5 to grout joint 6a with plow 1~
A strong connection can be made simply by injecting the material 9, and joints between the core reinforcing bars 5 and 5 and between the outer reinforcing bars 2 and 2 can be performed by pre-assembling the core reinforcing bars 5 and the outer reinforcing bars 2 as one unit. 4. Therefore, the number of times the crane is used for joints between the core reinforcing bars 5.5 and the outer circumferential reinforcing bars 2.2 can be reduced, and the construction work of the column reinforcing bars can be carried out efficiently.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a joint structure for column reinforcing bars according to the present invention. FIG. 2 is a cross-sectional view showing the joint portion of the outer peripheral reinforcing bars. Figure 3 is a cross-sectional view showing the joint part of the core reinforcing bar.
... Column 2 ... Peripheral reinforcing bar 3a ... Mechanical joint 5 ... Core reinforcing bar 6a ... Grout joint Applicant Mitsui Construction Co., Ltd. No. 1 Figure 1 Column No. Figure 2B

Claims (1)

[Claims] A plurality of core reinforcing bars are provided at the center of the column along the axis of the column, and a plurality of peripheral reinforcing bars are provided surrounding the core reinforcing bars along the axis of the column. In a joint structure for column reinforcing bars in which equicore reinforcing bars and peripheral reinforcing bars are connected along the axial direction of the column, the core reinforcing bars are connected via a grout joint, and the outer peripheral reinforcing bars are connected through a grout joint. Column reinforcement joint structure characterized by joining via mechanical joints.