JP2719274B2 - Segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of a segment, and more particularly to a joint structure of a segment capable of suppressing the opening of an assembled segment and increasing rigidity.

[0002]

2. Description of the Related Art Generally, a shield construction method is to construct a circular arc-shaped tunnel lining body by assembling segments at the inner rear side of a shield excavator, and to take a reaction force from the tunnel lining body assembled by a propulsion jack while shielding. This is a method to propel the excavator.

[0003] The segment is composed of a plurality of arc-shaped segment pieces divided according to the size of the excavated tunnel, and the pieces are sequentially connected in the circumferential direction, and the joining end face in the circumferential direction. By joining them together with bolts and nuts, they can be assembled integrally into a cylindrical shape.

[0005] For this purpose, as shown in FIG. 5, a bolt box 5 is formed behind the joint end surface 2 of the adjacent segment pieces 1 to cut out the inner periphery thereof and mount the bolt 3 and the nut 4. And this bolt box 5
Bolt hole 2 opened in joint end face 2 in
a, and the nut 4 is screwed into the protruding end portion thereof to perform the fastening and joining work of the segment pieces 1.

[0005]

However, in this joint structure, the bolt box 5 for performing the fastening operation with the bolt 3 and the nut 4 can be provided only inside the segment piece 1, and therefore, the segment piece can be provided. Bolt 3 and nut 4 on the outer peripheral side of the joint end face 1
However, there is a problem that the joining strength of the joint structure on the outer peripheral side of the joint end face is inferior, and the openings are caused to cause water leakage.

In addition, the above joint structure has a problem that it is difficult to provide sufficient rigidity to prevent deformation caused by an eccentric load applied to the segment.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and an object of the invention is to prevent the occurrence of water leakage by firmly joining the outer peripheral side of the joining end face of the segment piece. An object of the present invention is to provide a joint structure of a segment that can improve the overall rigidity.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of connecting a plurality of arc-shaped segment pieces in a circumferential direction, and connecting the circumferentially joined end faces of the segment pieces to each other with a bolt nut. In the joint structure of the segments to be joined through the joint structure, the joint structure is a groove that opens to the joint end face side at the outer edge portion of the joint end face and has a deep portion that widens, and extends at least along the tunnel axial direction. One end is opened at the end face in the tunnel axial direction, and the other end of the adjacent segment piece that is opposed to and communicated with the joining end face is inserted into both of the engaging grooves while being crotchly inserted. It is characterized by including a joining structure composed of an insertion member having a cross section to be fitted at the same time.

Here, the cross-sectional shape of the locking groove in which the deep portion widens has a portion having a width larger than the opening width at the joining end surface, and the insertion member locks with the narrow opening. The shape is not particularly limited as long as it does not fall off from the locking groove, and examples thereof include an L-shaped cross section, a U-shaped cross section, and a substantially circular cross section.

[0010]

According to the joint structure described above, when the segment pieces are assembled, the locking grooves of the joint structure come into contact with each other at the outer edge portion of the joint end face when the adjacent segment pieces come into contact with each other. Then, if the insertion member is inserted through the two engaging grooves of the opposed communicating grooves, the engaging members are simultaneously fitted into and engaged with the two engaging grooves, and the outer edges of the segment pieces are firmly integrated. Join.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows the entire structure of a segment 10 according to the present invention. In the figure, segment 10
Are the segment pieces 10a-
10f, a cylindrical shield excavator 12
And is assembled in a cylindrical shape while sequentially connecting the segment pieces 10a to 10f in the circumferential direction from the bottom in the rear inner periphery.

That is, in order to assemble the segment 10 into a cylindrical shape, for example, after the first segment piece 10a is installed along the inner bottom of the shield excavator 12, the second and third segments are provided on both sides in the circumferential direction. Segment piece 10b, 1
0c, and then further join the fourth and fifth segment pieces 10d and 10e to their circumferentially upper end portions, and finally join the fourth and fifth segment pieces 1 near the top.
If the sixth segment piece 10f is fitted between Od and 10e, a cylindrically integrated segment 10 is formed.

Each of the segment pieces 10a to 10a
f On the joint end surfaces 11 of each other, a joint structure 13 for joining and integrating them is formed. Such a joint structure 1
3, a bolt joint structure 15 for joining a precast concrete body 14 having a predetermined width and thickness formed in an arcuate plate shape on the inner side thereof, and an outer or outer edge, as shown in FIG. And a joining structure 16 to be joined at the portions.

The bolt joint structure 15 joins the segment pieces 10a to 10f by inserting and fastening bolt nuts 22 into bolt holes 20 formed in the joint pieces 17 attached to the joint end surfaces 11 of the main body portions 14. Things. The fastening operation of the bolt joint structure 15 is performed in a bolt box 18 provided on the back side of the joining piece 17, that is, on the inner peripheral side of the end of the main body 14.

On the other hand, the joining structure 16 has a crotch formed in the engaging groove 19 formed on the outer edge portion of the joining end face 11 and both the engaging grooves 19 of the adjacent segment pieces 10a to 10f communicating with each other on the joining end face 11. And the insertion fitting 23 which is fitted to these at the same time. The locking groove 19 is used when the segment pieces 10a to 10f are manufactured.
4 is formed by a groove fitting 24 embedded and integrated at the edge of the groove 4. The opening extends linearly along the outer edge of the joint end surface 11, and the width of the groove is wider than the opening at the depth. It has a substantially L-shaped cross section, and its end in the extension direction is open to the end face 25 of the main body 14 in the tunnel axial direction. The insertion fitting 23 is made of a steel material having a predetermined strength, and as shown in FIG. 3, has a substantially U-shaped cross-sectional shape that substantially matches the cross-sectional shape of the engaging groove 19 communicating with the opposite end. The locking grooves 19 are inserted into the communicating locking grooves 19 to simultaneously fit and lock the two locking grooves 19.

According to the segment joint structure 13 having such a configuration, the segment pieces 10a to 10a
At the time of assembling f, while fastening the bolt joint structure 15 in the bolt box 18,
By inserting the insertion fitting 23 from the opening of the distal end surface 25 of the segment 10 into the locking groove 19, it is possible to easily integrally join the segment pieces 10 a to 10 f not only on the inner side but also on the outer peripheral side.

FIG. 4 shows another embodiment of the joining structure 16. That is, the cross-sectional shape of the locking groove 19 has a portion whose depth is larger than the opening width at the joint end face 11, and is locked with the narrow opening, so that the insertion fitting 23 is dropped from the locking groove 19. The shape is not particularly limited as long as it is not a shape, and may have a substantially circular cross section as shown in the figure.

In this embodiment, the joint structure according to the present invention is employed for all the joint end faces of the respective segment pieces 10a to 10f. However, the joint end faces are arbitrarily selected and are provided only at necessary places, for example, only at the top of the tunnel. Can also be adopted. Further, in this embodiment, a concrete piece is used as the segment piece, but the joint structure of the segment of the present invention can be applied to a steel piece or the like.

[0019]

As described above in detail, according to the joint structure of the segment according to the present invention, the locking groove formed in the outer edge of the joining end face of the segment piece, and the insertion groove inserted into the locking groove. Since it has a joining structure composed of members and the segment pieces can be easily and firmly integrated even on the outer peripheral side of the joining end face, it is possible to prevent opening of the segments and easily prevent water leakage. In addition, even if the tunnel receives an eccentric load by improving the rigidity of the segment, it is possible to easily counter the deformation of the segment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the overall configuration of a segment that employs the present invention.

FIG. 2 is an enlarged perspective view showing one embodiment of the segment joint structure of the present invention.

FIG. 3 is a perspective view showing one embodiment of an insertion member.

FIG. 4 is an explanatory view showing another embodiment of the joining structure.

FIG. 5 is an enlarged sectional view showing a joint structure of a conventional segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 segment 10a-10f segment piece 12 shield excavator 13 joint structure 14 main-body part 15 bolt joint structure 16 joint structure 19 locking groove 23 insertion metal fitting

Claims (1)

(57) [Claims] 1. A segment joint structure in which a plurality of arcuate plate-shaped segment pieces are connected in the circumferential direction, and joint ends of the segment pieces in the circumferential direction are joined via bolts and nuts. A groove that opens to the joining end face side at the outer edge of the joining end face and has a widened deep portion, and extends along the tunnel axis direction and has at least one end thereof opened to the end face in the tunnel axis direction; A joining structure including an insertion member having a cross section that is inserted into both of the engaging grooves of the adjacent segment pieces that oppose and communicate with each other at the joining end face while being crotched, and that is fitted into both of the engaging grooves at the same time. A segment joint structure comprising: