JP2000356042A - Jig and method for joining precast concrete column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily join together the reinforcing bars of precast concrete columns to be connected to upper and lower layers. SOLUTION: When some of joining bars are inserted into a tubular element which can be opened and closed in a halved form along the longitudinal direction of its tubular shape with its end formed diagonally to the longitudinal direction of the tubular shape, joining jigs having fixing means for fixing the tubular element to some of the bars are fixed to the top ends of the plurality of joining bars 5, 5... placed upright on the concrete surface of a lower column 1, in such a manner that the top ends of the joining jigs are at different heights relative to the top ends of the joining bars 5 to constitute a plurality of levels. An opening 19 in a joint sleeve 18 positioned on the lower surface of a suspended upper column 2 is aligned with the joining bars 5 and the joining jig 10A at the greatest height is partially inserted into the opening 19. Under this condition, the upper column 2 is rotated to align the joining jig 10B of the second greatest height with the sleeve opening 19 so as to align the joining positions of all the joining bars with one another. After the joining bars are removed, the upper column 2 is lowered to join all the joining bars together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig and a joining method for a precast concrete column, and more particularly to a jig and a joining method for a precast concrete column which facilitate joining work between columns.

[0002]

2. Description of the Related Art Conventionally, mortar-filled joint sleeves are often used at column-column joints in precast concrete structures. In this type of column joint using a joint sleeve, laying mortar is laid on the upper surface of the lower column where the joint bars protrude, and the upper column with the joint sleeve built in at a predetermined position at the lower end is suspended just above the lower column. Thus, the columns are joined together such that the joining bars are fitted into the joint sleeve.

[0003]

In this column joint using a joint sleeve, since the tops of the main bars protruding from the lower column are arranged with the same height, the upper column is suspended on the main bar and the joint is joined. When fitting the sleeve and the joint bar, the opening of the joint sleeve on the lower surface of the upper column must be aligned with all joint bars. At this time, since the upper pillar is suspended, it is difficult to perform fine positioning. Also, since this joint surface (joint position) is near the floor concrete surface, the worker must keep a long position to look into the lower pillar lower surface for alignment, which is a troublesome work.
Furthermore, it takes time to work while the members are suspended,
Since the hoist occupying the entire work is occupied, the operation rate of the heavy equipment is reduced, and a delay in the entire process is expected.

Accordingly, an object of the present invention is to provide a jig for joining a precast concrete column and a joining method which can solve the above-mentioned problems of the prior art and can easily join a precast concrete column member. It is in.

[0005]

In order to achieve the above-mentioned object, the present invention relates to a tubular body which can be opened and closed in a half-split shape with respect to the longitudinal direction of the cylinder and whose tip is formed obliquely with respect to the longitudinal direction of the cylinder. And fixing means for fixing the tubular body to a part of the reinforcing bar when a part of the joint bar is inserted into the tubular body.

A tubular body which can be opened and closed in a half-split shape with respect to the longitudinal direction of the cylinder and whose tip is formed obliquely with respect to the longitudinal direction of the cylinder, and when a joint muscle is partially inserted into the tubular body, A joining jig provided with fixing means for fixing the tubular body to a part of the reinforcing bar is attached to a top end of a plurality of joining bars erected on the concrete surface of the lower pillar, and a top end of the joining jig is provided. Is fixed to the top end of the connecting bar at different heights in a plurality of steps, the opening of the joint sleeve arranged on the lower surface of the suspended upper layer column, the highest height of the joining jig And a part of the joining jig is inserted into the opening, and in this state, the upper pillar is rotated to align the joining jig of the next height with the sleeve opening. To make the joint positions of all the joint bars coincide, and after removing the joint jig, descend the upper column It was characterized in that to perform the bonding of the total bond muscles.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a jig and method for joining a precast concrete column according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a schematic configuration of a joint 3 of the known precast concrete columns 1 and 2 of the present invention. FIG. 1 shows a state in which the joining jig 10 of the present invention is attached to the tip of a joining bar that is arranged so as to protrude from the concrete top end of the lower pillar 1. In the present embodiment, the joining jig 10 is fixed to the upper ends of two joining bars 5 arranged apart from each other. The upper pillar 2 joined to the lower pillar 1 via the joint bar 5 is shown with a part of the lower pillar cut away. Note that illustration of hoops and the like is omitted in FIG.

FIG. 2 is a perspective view showing the entirety of the joining jig 10, and FIG. 3 is a partial cross-sectional view showing a state where the joining jig 10 is attached to the tip of the joining streak 5. As shown in FIG. 2, the joining jig 10 has a short pipe shape whose tip is obliquely cut, and in the present embodiment, a carbon steel pipe (S
TK). This short tube shape is formed by joining a symmetrical cover 11 which is half-processed in the longitudinal direction of the tube at a cut end face, and a hinge 12 provided on the back side shown in FIG. Can be opened. A fastener 13 is attached to the surface of the open end 11a. Normally, the fastener 13 is locked, the open end 11a is closed, and the joining jig 10 as a whole can hold a tubular shape. Further, a fixing bolt 15 is screwed near the lower end of one cover 11. The fixing bolt 15 is a nut 1 welded to an outer surface of a through hole 16 (see FIG. 3) formed in a tube side surface.
7 is screwed to the cover 11.

FIG. 3 is a partial sectional view showing a state in which the joining jig 10 is fixed to the joining line 5. As shown in the figure,
A resin spacer 14 is attached to the inner surface of the pipe of the joining jig 10. It is preferable that the thickness t of the spacer 14 is such that the spacer 14 is positioned substantially at the center of the cover 11 when inserted into the cover 11 of the joining jig 10.
When the fixing bolt 15 screwed through the nut 17 welded to the side surface of the cover 11 is tightened, the fixing bolt 15
The tip comes into contact with the upper end side surface of the joint line 5. Thus, the joining jig 10 can be fixed to the upper end of the joining bar 5 such that the joining bar 5 is sandwiched between the spacer 14 and the bolt tip 15a.

Here, a method of attaching the joining jig 10 to the joining line 5 will be described with reference to FIGS. 1 and 5 (a). In both figures, three auxiliary lines showing the relationship between the height of the reinforcing bar and the tip of the joining jig 10 are shown. The auxiliary line a indicates the top position of the first joining jig 10, the auxiliary line b indicates the top position of the second joining jig 10, and the auxiliary line c indicates the top position of the joining line 5. As described above, the joining jig 10 is attached to at least two joining bars 5 among the joining bars 5 arranged in a target cross section when the column members are joined in the vertical direction, for example. In other words, in order to attach the first joining jig 10A to the joining bar 5A, the overlapping margin of the joining bar 5A inserted into the lower end of the joining jig 10A is minimized as long as the upper end of the joining bar 5A can be fixed with the fixing bolt 15. So that Next, the second joining jig 10B is positioned such that its top end is located between the top end of the first joining jig 10A and the top end of the joining bar 5, and the first joining jig 10A is The joint bar 5A is attached to the joint bar 5B at a position distant from the attached joint bar 5A.

Here, as described above, the joining operation of the columns using the joining jig 10 attached to the joining bar 5 will be described.
This will be described with reference to FIGS. First, prior to the following operation, the planar position, the fall, the level, and the like of each joint 5 are checked based on the ground ink and the like, and necessary corrections are made. Then, as shown in FIG. 4 and FIG. 5 (b), the upper pillar 2 suspended by the unillustrated hoist is lowered to just above the joining bar 5A of the lower pillar 1, and the first joining jig 10A The top end and the opening 19 of the joint sleeve 18 corresponding to the joining bar 5 to which the joining jig is attached are aligned, and the top end of the first joining jig 10A hangs over the opening 19 of the joint sleeve 18A. Lower the column member at low speed until it comes to a stop. In this stopped state, the column member is connected to the joint bar 5 until the lower end opening 19 of the joint sleeve 18B comes to a position immediately above the second joint jig 10B.
It rotates in a predetermined direction (the direction of the arrow in FIG. 4) around A as a rotation center, and lowers the upper pillar 2 in a state where the second joining jig 10B and the joint sleeve 18B are in a straight line. And
When the top end of the second joining jig 10B is slightly hung in the joint sleeve 18B, the descent is stopped again (FIG. 5C).
reference).

In this state, in the case of a member having a small cross-sectional area such as a column, the opening 19 of the joint sleeve 18 and the top end of the joint 5 coincide with each other at the joint 5 at all positions. Therefore, by lowering the upper column 2 as it is from this state, the top ends of all the joint bars 5 are
(See FIG. 5D). In this state, the fixing bolt 1 of the first joining jig 10A and the second joining jig 10B
5 is unscrewed, the portion guided into the joint sleeve 18 is pulled out so as to be shifted downward, and when the whole is exposed, the fastener 13 is unlocked, the cover 11 is opened, and the joint jig is removed from the joint bar 5. . At this time, since all the joint bars 5 of the lower column 1 are hung on the joint sleeve 18, the upper column 2 is immediately lowered after the joining jig is removed (see FIG. 5E). Thereafter, predetermined level adjustment and grout injection are performed, and the column joining on the floor is completed.

In the above description, the joining of the precast concrete columns has been described. However, in the vertical joining of the precast concrete wall material or the like, by attaching the joining jig of the present invention to the joint bar at a predetermined position, the extended wall material can be obtained. It is also possible to make the building easier.

[0014]

As described above, in the vertical joining of the precast concrete column members, joining of the joining bar and the joint sleeve can be performed easily and quickly, and the troublesome work of the worker can be reduced. This has the effect of increasing the operation rate of the hoisting machine in the work of building pillars.

[Brief description of the drawings]

FIG. 1 is a state explanatory perspective view showing a state of use in one embodiment of a joining jig for a precast concrete column according to the present invention.

FIG. 2 is a perspective view showing the joining of the precast concrete column shown in FIG.

FIG. 3 is a partial cross-sectional view showing a state in which the joining jig is attached to a joining bar.

FIG. 4 is an explanatory perspective view showing a use state following FIG. 1;

FIG. 5 is a work sequence explanatory view showing a procedure of a joining state of precast concrete columns.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower pillar 2 Upper pillar 5, 5A, 5B Joint 10, 10, A, 10B Joint jig 11 Cover 11a Open end 15 Lock bolt 18 Joint sleeve 19 Opening

Claims (2)

[Claims] 1. A tubular body which can be opened and closed in a half-split shape with respect to the longitudinal direction of the cylinder and whose tip is formed obliquely with respect to the longitudinal direction of the cylinder, and when a joint bar is partially inserted into the tubular body. And a fixing means for fixing the tubular body to a part of the reinforcing bar. 2. A tubular body which can be opened and closed in a half-split shape with respect to the longitudinal direction of the cylinder and whose tip is formed obliquely with respect to the longitudinal direction of the cylinder, and when a part of a joint muscle is inserted into the tubular body. A fixing jig provided with fixing means for fixing the tubular body to a part of the reinforcing bar is attached to a top end of a plurality of connecting bars erected on the concrete surface of the lower pillar, The top end is fixed to the top end of the joint bar so as to have different heights in a plurality of steps, and the opening of the joint sleeve arranged on the lower surface of the suspended upper layer pillar, the highest among the joining jigs A part of the joining jig is inserted into the opening by performing alignment with the joining bar at the height, and in this state, the upper layer column is rotated to connect the joining jig of the next height with the sleeve opening. Align and align the joint positions of all joint bars, and after removing the joint jig, lower the upper column Method of joining pre-cast concrete column which was characterized in that to perform the bonding of the total bond muscles.