JPH0743274Y2 - Segment joint structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a joint structure of a segment used in a shield construction method.

[0002]

2. Description of the Related Art A conventional steel segment or concrete segment has bolt holes formed at regular intervals in joint plates provided around four sides, and bolts inserted in the bolt holes are tightly connected with nuts to join the segments together. The light structure was common.

[0003]

However, in the above-mentioned conventional structure, it is necessary to manually insert the bolts into the bolt holes and tighten the nuts, so that much labor and time are required. However, it was difficult to automate the joining work. Further, if the tightening torque exceeds, there is a risk that cracks may occur at the joints of the segments.

The present invention has been developed in view of the above circumstances, and by simplifying the structure of the joining portion, the joining work by a robot or the like can be automated and the labor and time can be greatly reduced. An object is to provide a joining device.

[0005]

SUMMARY OF THE INVENTION The structure which is the subject of the present invention is an enlarged wedge which is open at the end on the inner surface of a joint plate of segment green and has a substantially hexagonal shape inside the straight groove. While fixing the joint fitting with the hole formed, cut out leaving the upper end of the joint plate that is in contact with the end opening of the wedge hole, butt the segments to be joined to match the opening, and form a hexagonal shape at both ends of the linear part. A wedge having an enlarged head portion is inserted into the wedge hole so as to straddle the joining segment, and the upper part of the joint plate is fitted in a concave groove in the middle of the wedge.

[0006]

Embodiments will be described below based on the illustrated embodiments. 1
Indicates a steel segment. This segment 1
Is curved, and joint plates 2 protruding from the inner surface are fixed to the four peripheral ends of the joint. Joint fittings 3 are attached to the inner surface of the joint plate 2 at regular intervals. The joint fitting 3 is formed in a rectangular parallelepiped shape having the same height as the joint plate 2, and a wedge hole 4 is provided on the surface thereof. The wedge hole 4 has an enlarged shape that is open at the end and has a substantially hexagonal shape inwardly following the linear groove portion. In the case of FIG. 1, the wedge hole 4 is a modification in which two corners of a rectangle are cut off diagonally. Formed into a hexagonal shape,
Further, the joint plate 2 is linearly opened, and the deformed hexagonal portion is bulged.

Further, vertical ribs 5 are attached in parallel to the circumferential direction across the joint metal fittings 3 of the joint plate 2 for joining the pieces mounted in the width direction, and for joining the rings mounted in the circumferential direction. An intermediate girder 6 parallel to the width direction is attached to the middle of the joint fitting.

Further, the joint plate 2 at the insertion portion of the wedge 7 has a wedge hole 4
The upper half 2a of the joint plate 2 is left at a position where it comes into contact with the end opening of the joint plate 2, and the lower half of the joint plate 2 is cut off.
Is formed in the recess 9 and the upper portions 2a, 2 of the joint plate 2 are
Fit in the state where a is overlapped.

The wedge 7 has an enlarged head 8 having a substantially hexagonal shape at both ends of the linear portion so that the wedge 7 can be fitted into the wedge hole 4 whose opening is aligned with each other. So that it is inserted into the wedge hole 4.

FIGS. 4 and 5 show modifications of the wedge holes 4 and the wedges 7.

[0011]

According to the present invention, the wedge having the above-described structure has the wedges straddling the segments and sandwiching the overlapping portions of the joint plates of the segments, and the resistance of the enlarged hexagonal heads at both ends of the wedge. The two fixing means according to (1) to (1) enable reliable joining, and the wedge may be inserted from one side, and the work is easy to mechanize. Also, the enlarged head is hexagonal and is well suited to the wedge hole, and the contact surface is dispersed, and there is little risk of stress concentration, which is practical.

[Brief description of drawings]

FIG. 1 is a front view of a joining device of the present invention.

FIG. 2 is a sectional view taken along line BB.

FIG. 3 is a sectional view taken along line AA.

FIG. 4 is a front view of a wedge hole.

FIG. 5 is a front view of another wedge hole.

[Explanation of symbols]

1 ... Segment, 2 ... Joint plate, 3 ... Joint fitting, 4
...... Wedge hole, 5 ... Vertical rib, 6 ... Intermediate girder, 7 ... Wedge, 8
…… Enlarged head, 9 …… Concave.

Claims (1)

[Scope of utility model registration request] 1. A joint fitting 3 is fixed to an inner surface of a joint plate 2 at a peripheral edge of a segment, the joint fitting 3 having an enlarged wedge hole 4 which is open at an end and which has a substantially hexagonal shape on the inner surface is fixed to the linear groove portion. A wedge having notches, leaving the upper portion 2a of the joint plate 2 in contact with the end opening of the wedge hole 4, and abutting segments to be joined so as to match the opening, and having a substantially hexagonal enlarged head 8 at both ends of the linear portion. 7 is inserted in the wedge hole 4 so as to straddle the segment to be joined, and the concave groove 9 in the middle of the wedge 7 is inserted.
A joint portion structure of a segment, characterized in that the upper portions 2a, 2a of the joint plate 2 are fitted to each other in an overlapping state.