JPH0421921Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a structure that connects reinforcing bars on both sides of facing PC beams, which are precast concrete beams.

(Prior Art) Conventionally, there is a structure described in Japanese Utility Model Publication No. 50-45612, which connects the main beam reinforcements of PC beams facing each other across the column at the joint between a column and a beam. In this conventional example, reinforcing bars arranged horizontally through the column are passed through, and a coupler is attached to the end.
A connecting bolt is loosely fitted into a connecting metal fitting embedded in the beam, and the tip of the connecting bolt is screwed to the coupler. Also, as a joint device for connecting two parts,
There is one described in Publication No. 1443311. This conventional example is
The precast members are connected using turnbuckle fasteners, threaded rods, connecting nuts, screws, piano wire, and co-rotation prevention fittings. The above-mentioned tightening tool has forward and reverse threads at both ends, a right-hand threaded rod is screwed into one of the threads, and a connecting nut is screwed to this screw rod. The piano wire is screwed in. In addition, the other screw has a reverse thread of the reverse thread and a normal thread provided on the threaded rod, and a connecting nut is screwed into the positive thread, and a piano wire protruding from the precast member is inserted into the connecting nut. is screwed in. A co-rotation prevention fitting is used to prevent the coupling nuts from rotating in tandem.

To connect, fix the tightening tool, turn the knob on the end of the screw puller, pull out the screw puller, bring the piano wires closer together, connect both piano wires with both connecting nuts, and return with the screw. It is something that stops. Then twist the fastener and connect the piano wire under tension.

In addition, as a third conventional example, main reinforcements 1 and 2 of PC beams B and Ba are installed on both sides of column P as shown in Figure 1.
Coupling pipes 3 and 4 are attached to the ends, connecting reinforcing bars 5 are arranged between the opposing coupling pipes, and each coupling pipe 6 and 7 is attached to both ends of the connecting reinforcing bars.
The joint pipes 3 and 4 facing each joint pipe were connected by threaded rods 8 and 9, and the main reinforcements were connected. And nuts 10, 10a and nuts 11, 11 attached to each threaded rod 8, 9
In a, the connection between the joint pipes is fixed and smooth stress transmission between the main reinforcements is attempted. The method of connecting the main reinforcements 1 and 2 is to first position the connection reinforcing bar 5 horizontally between the joint pipes 3 and 4 of the main reinforcements, and then attach the threaded rod 8 to the joint pipe 6 at one end (for example, the left end). is screwed into the joint pipe 3 of the PC beam 1, and temporarily fastened between the joint pipe 3 and the joint pipe 6 with nuts 10 and 10a. At this time, screw rod 8
To screw into the joint pipe 3, tighten both nuts 10,
10a are brought into contact with each other and both nuts are moved simultaneously, or the nut 10a is turned to advance the threaded rod. After temporarily fixing the left end of the connecting reinforcing bar, connect the joint pipes 7 and 4 with the screw rod 9 using the nuts 11 and 1 in the same manner as above.
Connect using 1a.

Main reinforcement (upper end reinforcement) 1a and 2 above PC beam B, Ba
The connection structure with a is also substantially the same as that of main reinforcements 1 and 2, so the symbols are the same. In addition,
Beam steel frames S and Sa protruding from the side end faces of PC beams B and Ba are connected to joint plates C and Ca attached to the flanges of column P.

(Problem to be solved by the invention) According to the first conventional example, since the connecting bolt loosely fits into the connecting hardware and is movable, if a construction error occurs in the spacing between the column and the beam, the connecting bolt Even if the tip of the bolt can be fixedly connected to the coupler, the head of the connecting bolt may not come into contact with the mounting surface of the hardware.
Temporary fixing of PC beams may become unstable.

According to the second conventional example, when connecting, it is necessary to feed out the threaded rod with a knob, fix it with a screw, twist the fastener, and prevent the co-rotation of the anti-co-rotation fitting. Since this method requires operations, the connection operation becomes complicated and troublesome.

In the third conventional example, when the distance between the PC beams B and Ba, that is, the distance between the joint pipes 3 and 4, does not match the design value and the error is large, for example, at the left end of the connecting reinforcing bar 5. Even if the coupling pipe 3 and the coupling pipe 6 can be connected by the threaded rod 8 on the other side, there is an error in the thread pitch between the coupling pipe 4 and the threaded rod 9 on the other side. 4 cannot be screwed in, and the pitch must be adjusted. However, since the screw directions of the threaded rods 8 and 9 are the same, even if the connecting reinforcing bar 5 is rotated, the length of the connecting reinforcing bar including the threaded rod does not change, and therefore the pitch error cannot be eliminated. Therefore, it was difficult to connect in the above case.

The purpose of this invention is to make it possible to stably temporarily fasten a PC beam to a column even if there is an error in the spacing between the column and the PC beam. Another purpose is to enable simple connection work. Yet another purpose is
Even if an error occurs in the spacing of the PC beams and the above-mentioned pitch error occurs, it is possible to absorb this error and connect the reinforcing bars.

(Means for solving the problem) In this invention, the
Beam reinforcing bars arranged on the PC beam, joint pipes attached to the ends of the beam reinforcing bars, connecting reinforcing bars arranged between the beam reinforcing bars and having joint pipes at both ends,
It consists of a threaded rod that connects each joint pipe of the connecting reinforcing bars and the joint pipe of the PC beam located opposite to this joint pipe, and two nuts attached to this threaded rod. Thread directions of the threaded rods located on both sides of the connection reinforcing bar are in a reverse thread relationship with each other.

(Example) An example of the present invention will be described below with reference to FIG.

In this example, the threaded rod 19, the joint pipe 14
and 17, except for the structure of nuts 21 and 21a,
Since the other configurations are substantially the same as the example shown in the first figure, the reference numerals are the same.

The threaded rod 19 located on one side (right side) of the connecting reinforcing bar 15 has a thread direction opposite to that of the threaded rod 8 located on the other side. The threaded rod 19 connects the joint pipe 14 on the PC beam Ba side and the joint pipe 17 attached to the connecting reinforcing bar 15, and fixes this connection with nuts 21, 21a. The thread direction of the nuts 21, 21a is the same as the female thread (only the female thread 6a is shown) of each hole of the coupling pipes 3, 6. ),
The nuts 10 and 10a have a reverse thread relationship. The main reinforcements 1 and 2 have joint pipes 6 and 17 at both ends.
The threaded rods 8, 19 are connected by connecting reinforcing bars 15 having
connected via.

Next, the connection method will be explained.

In advance, the joint pipes 6 at both ends of the connecting reinforcing bars 15,
Threaded rods 8 and 19 are connected to 17, respectively.
Therefore, first, tighten the nut 1 on the left side of the connecting reinforcing bar 15.
0 and 10a, the threaded rod 8 is advanced and screwed into the joint pipe 3, and the connection of the threaded rod is temporarily fixed with both nuts. Next, the threaded rod 19 is advanced from the joint pipe 17 using the nuts 21 and 21a on the right side, and is screwed into the joint pipe 14. At this time, if a construction error occurs in the distance between the joint pipe 3 and the joint pipe 4, and the thread pitch of the threaded rod 19 and the joint pipe 14 prevents the threaded rod 19 from being screwed into the joint pipe 14, Turn the connecting reinforcing bar 15,
Both the threaded rods 8 and 19 are moved in opposite directions to adjust their lengths to eliminate the error in the thread pitch between the threaded rod 19 and the joint pipe 14, and then the threaded rod is screwed into the joint pipe 14. Finally, Natsu 1
0, 10a and the nuts 21, 21a are strongly pressed against the side end surfaces of the joint pipes 3, 6 and the joints 14, 17 to fix the threaded rods and complete the connection work between the main reinforcements 1 and 2.

The connection structure and connection method between the upper reinforcement 1a and the upper reinforcement 2a are substantially the same as those of the main reinforcement 1 and the main reinforcement 2, and the symbols are the same.

(Effects of the invention) As explained above, according to the invention, since the connecting reinforcing bars and the reinforcing bars of the beam are connected by the joint pipe, threaded rod, and nut, there is no error in the spacing between the column and the PC beam. Even if this occurs, the connection will not become unstable, and since the thread directions of the threaded rods located on both sides of the connecting reinforcing bars are in a reverse thread relationship, construction errors will occur in the spacing between the PC beams, and the threaded rods will Even if there is a screw pitch error between the beam reinforcement and the beam reinforcement, this can be absorbed.
Both reinforcing bars of the beam can be reliably connected via the connecting reinforcing bars, and the connection operation is easy. Since the connection work can be performed by operating the nut and moving the threaded rod, the connection work is simpler than in the conventional example.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a conventional example, and FIG. 2 is a partially cutaway front view showing an embodiment of the present invention. 1, 1a, 2, 2a... Main reinforcement, 3, 14... Joint pipe, 6, 17... Joint pipe, 8, 19...
...Threaded rod, 15... Connection reinforcing bar, 10, 10a, 2
1, 21a...Natsuto, B, Ba...PC beam, P...
...pillar.

Claims (1)

[Scope of Claim for Utility Model Registration] Reinforcing bars of the beams arranged in PC beams facing each other across the columns, joint pipes attached to the ends of the reinforcing bars of the beams, and between the reinforcing bars of the beams. Connecting reinforcing bars arranged with joint pipes at both ends, threaded rods that connect each joint pipe of the connecting reinforcing bars, and the joint pipes of the above-mentioned PC beams located opposite to these joint pipes, and attached to this threaded rod. A connection structure for reinforcing bars of a PC beam, characterized in that the screw directions of the threaded rods located on both sides of the connecting reinforcing bars are in a reverse thread relationship with each other.