JP2608119B2 - Joint structure for joining concrete members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention uses a joint fitting embedded in a joint end face of each concrete member to join a pair of concrete members such as a concrete segment for tunnel construction. The present invention relates to a joint structure.

[Problems to be solved by the prior art and the invention]

Conventionally, as this kind of joint fitting, there is a structure in which a U-shaped notch for engaging a joining bolt which is opened on the inner surface of a concrete member is formed in a fastening plate, and a joining bolt is attached using the notch. . By the way, when the concrete member is joined with the opening of the notch of the fastening plate facing downward, when the frictional force due to the tightening of the joining bolt is weakened by the loosening of the tightening force, the downward opening of the notch is The connection bolt may fall from the

In order to solve the above problems, the applicant has proposed in Japanese Utility Model Laid-Open No. 63-76112 a structure in which a locking piece is fixed to a notch opening end face of a fastening plate to prevent a joining bolt from dropping. At the time of the joining operation, the small piece sticks to the opening end surface and becomes a hindrance, lowering the work efficiency and sometimes causing an injury or an accident.

The present invention develops the above-described invention, eliminates obstacles at the time of joining work, facilitates joining work, and can easily cope with the use of a plurality of joining bolts by using a large washer. Was developed.

[Means for solving the problem]

The present invention is directed to a joint in which a joint work space is formed by a fastening plate disposed on a joint end surface of a concrete member and having a U-shaped notch opening to the inner surface of the concrete member, and both side walls and a rear wall. In the metal fittings, a step is provided on the inner surface of the tightening plate, and a step is also provided on the large washer into which the joining bolt is inserted, and the two steps are engaged to fasten the fastening plates with the joining bolt. A joint structure for joining concrete members. It is.

The present invention has a structure in which a step is provided on the inner surface of a tightening plate of a joint fitting, and a large washer interposed between the tightening plate and a nut is engaged with the step to prevent the joining bolt from dropping. In this case, the fixing of the locking pieces that hinder the work in the above-mentioned invention is omitted.

The present invention provides a structure in which a plurality of notches are provided in one tightening plate, and a pair of joint fittings is fastened using one large washer having a plurality of joint bolt insertion holes and a plurality of joint bolts. In this case, the structure is particularly preferably adopted. However, it is of course also adopted when a pair of joint fittings is fastened by one large washer having one insertion hole and one joining bolt.

〔Example〕

The joint fitting 1 includes a fastening plate 2, both side walls 4, and a rear wall 5, and is buried in a joint end face of a concrete member C such as a segment so as to form a box-shaped joint work space 6. A U-shaped notch 3 opening on the inner surface side of the concrete member C is formed in the center portion and on both sides of the fastening plate 2, and further, a step 7 projecting into the joining space 6 is formed. ing. In addition, the joint fitting 1 is provided with anchor bars 8, 8. (See FIGS. 3 and 4.) On the other hand, a large washer 10 having an insertion hole 3a corresponding to the number of joining bolts and a step 11 provided on the outer surface side, a joining bolt 9 and a nut 13 are prepared. (See FIG. 3) In order to join the two concrete members C, C with the joint fitting 1, first, three joint bolts 9 are inserted into the joint bolt insertion holes 3a of the large washers 10, 10, and both ends of the joint bolt 9 The assembly in which the nuts 13 and 13 are screwed into the threaded portions 3 is inserted into the notches 3 and 3 of the tightening plates 2 and 2.

Next, the step 11 on the outer surface side of the large washer 10 is engaged with the step 7 of the fastening plate 2. The threaded portions at both ends of the joining bolt 9 are reverse screws, and the nuts 13 are screwed at a sufficient interval to be inserted into the notches 3.

Next, the head 12 of the joining bolt 9 is rotated to rotate the nuts 13, 13.
Are narrowed, and the concrete plates are joined by clamping and clamping the clamping plates 2 and 2 and the large washers 10 and 10 of the concrete members. (See FIGS. 1 and 2.) As a result, the large washer 10 is engaged with the step 7 of the tightening plate 2 and the nut 13 of the joint whose opening of the notch 3 faces downward is slightly loosened. And the large washer 10 does not fall. Although the step portion 7 and the corresponding step portion 11 are shown as being provided with one step, the step portion may have two or more steps.

〔The invention's effect〕

The present invention has the above configuration, and (1) a step provided on the inner surface side of the fastening plate having a U-shaped notch,
By locking the large washer overlapping the fastening plate, the joining bolt and the large washer or the washer can be prevented from dropping. (2) Since the step does not protrude from the surface of the fitting, it does not hinder the assembling work of the fitting, and the efficiency of the joining work is improved as compared with the conventional locking piece, and the risk of injury or accident is increased. Is gone. It produces effects such as:

[Brief description of the drawings]

1 and 2 are sectional views showing an embodiment of the present invention.
FIG. 4 is an exploded perspective view of an example of the component of the present invention, and FIG. 5 is a perspective view of a concrete segment. DESCRIPTION OF SYMBOLS 1 ... Joint fitting, C ... Concrete member, 2 ... Tightening plate, 3 ... Notch, 3a ... Insertion hole, 4 ... Side wall, 5 ... Rear wall, 6 ... Work space, 7 ... step, 8 ...
… Anchor bar, 9… joint bolt, 10… large washer, 11
... Step, 12 ... Head, 13 ... Nut.

Claims (1)

(57) [Claims] Claims: 1. A concrete member is disposed on a joint end face of a concrete member.
A step is provided on the inner surface of the tightening plate in a joint fitting in which a joint work space is formed by the tightening plate having a U-shaped notch formed in the inner surface of the concrete member and the side walls and the rear wall. A joint part structure for joining concrete members, characterized in that a step is also provided on a large washer into which a joining bolt is inserted, and the two steps are engaged to fasten between the fastening plates with the joining bolt.