JP2780894B2 - 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 increasing the rigidity of an assembled segment.

[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 constituted by a plurality of arc-shaped segment pieces divided according to the size of the excavated tunnel. By joining the joint end surfaces in the axial direction and the tunnel axial direction to each other with a bolt nut or the like, they are integrally assembled in 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]

In order to achieve the above object, a segment joint structure according to the present invention is characterized in that a plurality of arcuate plate-shaped segment pieces are connected in the circumferential direction and in the tunnel axis direction, and the segment pieces are joined together. In a joint structure of a segment in which joining end surfaces are joined via a bolt and a nut, a male hook-like portion bent inward is formed at an outer edge portion of the joining end surface of the segment piece on the front assembly side, and the rear assembly side A female hook is formed at the outer edge of the joint end face of the segment piece so as to engage the male hook from the inside, and the segment pieces are joined while engaging the both.

[0009]

According to the joint structure described above, the inner peripheral side of the joint end face is firmly joined by the bolt nut, and the outer peripheral side is firmly joined by the engagement of the male hook and the female hook. By joining, the opening of the segment is prevented to prevent water leakage, and the male hook and the female hook engage with each other to improve the rigidity of the segment against deformation.

[0010]

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.

In this assembling method, for example, after the first segment piece 10a is installed along the inner peripheral bottom of the shield excavator 12 as a first assembly side, the second and third segments are installed on both sides in the circumferential direction as the second assembly side. And the fourth and fifth segment pieces 10d and 10e are further joined to the circumferentially upper end portions thereof as a rear assembly side.
And finally the sixth segment piece 10 between the fourth and fifth segment pieces 10d and 10e near the top.
When f is fitted as the rear set side, a cylindrically integrated segment 10 is formed.

Each of the segment pieces 10a to 10a
FIG. 2 (a) shows the joint end face of the joint structure of FIG.
As shown in an enlarged manner in (b), the pre-assembly-side joint is integrated with an end of a precast concrete main body 14 having a predetermined width and thickness formed in an arc plate shape in an L-shaped cross section. It consists of a metal fitting 16 and a rear fitting metal fitting 18. Each of the metal fittings 16 and 18 includes a horizontal piece 16a, 18a integrated with the outer peripheral portion of the main body 14, and a horizontal piece 16a,
The connecting pieces 16b and 18b extend substantially at right angles toward the inner peripheral side from 18a and abut against each other in an assembled state.

Further, bolt holes 20 are formed in the inner peripheral sides of the joining pieces 16b and 18b so as to coincide with each other in abutting condition. Is the bolt box 14a
A bolt 22 is inserted into the bolt hole 20 of each of the joining pieces 16b and 18b in the bolt box 14a, and a nut 24 is screwed into the bolt box 14a from the opposite side. It can be carried out.

A male hook-like portion 26 extending in the direction of extension of the horizontal piece 16a and bending inward into an L-shaped cross section is provided at the outer edge of the pre-assembly joint fitting 16, that is, at the L-shaped corner. Are protruded, and correspondingly, the rear-side joining metal fitting 1
A concave female hook 28 engaging with the male hook 26 is formed at the outer edge of 8. It is to be noted that, as shown in FIG. 3 (a), it is preferable that these joining fittings 16 and 18 are provided over the entire width of the main body portion 14 of the segment piece, but it is not always necessary to provide them over the entire width. As shown in ()), it may be provided only at a predetermined location, for example, only at a bolt box portion.

According to the joint structure of segments having such a configuration, each of the segment pieces 10a to 10f
At the time of assembling, the female hook-shaped portion 28 is engaged with the male hook-shaped portion 26 by fitting the female hook-shaped portion 28 from the inside, and the bolt 22 and the nut 24 inserted through the bolt hole 20 are fastened to each other. Segment pieces 10a-
10f is firmly joined. In this embodiment, FIG.
As shown in the figure, the male hook-like portion 26 has both end faces of the first segment piece 10a which is the pre-assembled side, upper joining end faces of the second and third segment pieces 10b and 10c, and fourth and fifth joint pieces. The segment pieces 10d and 10e are formed on the upper joining end surfaces.

Correspondingly, the female hook-like portion 28 has a lower joining end surface of the second and third segment pieces 10b and 10c on the rear side, and the fourth and fifth segment pieces 10b.
It is formed on each of the lower-side joining end faces of d and 10e and on both end faces of the sixth segment piece 10f.

Therefore, the segment pieces 10a-1
On the outer peripheral side of the joint end face 0f, the male hook-like portion 26 and the female hook-like portion 28 are engaged with each other by attaching the rear-piece-side segment piece from inside, and when the assembly of the segment 10 is completed, the inner peripheral side is In addition to the fastening by the bolts 22 and the nuts 24, the segments 10 can be firmly integrated, and sufficient joint strength can be obtained at each joint end face.

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 a segment piece, and a joining fitting 1 is provided at both ends thereof.
6 and 18 are integrated, but the joining metal fittings 16, 1
8 as a whole may be configured as a steel frame segment piece.

Further, in this embodiment, the case where the segment pieces are continuously connected in the circumferential direction has been described. However, as shown in FIG. 4, the segment joint structure according to the present invention has the segment pieces connected in the tunnel axial direction. The joint structure of the segment in the direction of the tunnel axis also belongs to the technical scope of the present invention.

[0020]

As described above in detail, according to the joint structure of the segment according to the present invention, the male hook-shaped portion provided on the joint end face of the segment piece and the female hook-shaped portion engaging with the male hook-shaped portion are engaged. By joining, the outer peripheral side of the joint end face is also strongly joined, preventing the opening of the segment and preventing the occurrence of water leakage, and improving the rigidity of the segment and causing the tunnel to receive an uneven load. But can resist the deformation of the segment

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the entire configuration of a segment according to the present invention.

FIG. 2A is an exploded perspective view showing a joint end surface of a segment piece in an exploded manner. (B) is a cutaway perspective view showing the joined state of the segment pieces.

FIGS. 3A and 3B are explanatory views showing a state in which a joint fitting is attached to a segment piece, wherein FIG.

FIG. 4 is an explanatory view showing an embodiment in which segment pieces are continuously provided in the tunnel axial direction using the segment joint structure of the present invention.

FIG. 5 is a partial cross-sectional view showing a joint end face between conventional segment pieces.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 segment 10a-10f segment piece 12 shield excavator 14 main-body part 16 front-end side connection bracket 18 rear-end side connection metal part 20 Bolt hole 22 Bolt 24 Nut 26 Male hook part 28 Female hook part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 11/04 E21D 11/08

Claims (1)

(57) [Claims] In a joint structure of a segment in which a plurality of arc-shaped segment pieces are connected in a circumferential direction and a tunnel axis direction, and joint end faces of the segment pieces are joined via a bolt nut, A male hook-like portion bent inward is formed on the outer edge of the joint end surface of the segment piece, and the male hook-like portion is engaged with the outer edge of the joint end surface of the segment piece on the rear side from inside. A joint structure for a segment, wherein a female hook portion is formed, and the segment pieces are joined while engaging the two.