JPH07238789A - Joint structure of shield segment - Google Patents

Abstract

PURPOSE:To provide a joint structure of segment wherein rigidity of the whole segment ring can be enhanced and efficiency of joint work can be improved. CONSTITUTION:Holes 3 are formed on the end surface 2 of a segment 1 and two segments 1, 10 are joined to each other through bar-shaped joint members 4 to be inserted into the holes 3. An adhesive 5 is applied to the outer surfaces of the members 4 and by fitting the members 4 into the holes 3, the members 4 are fixedly attached to the segments 1, 10. Defects do not occur so often in the segment as in a joint structure by tightening bolts and the joint structure of segments can be employed at a shield construction site, thereby improving work efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield segment joint structure applicable to, for example, a tunnel shield construction method.

[0002]

2. Description of the Related Art Conventionally, a shield segment made of concrete (or resin concrete) is used as a shield segment which is divided in a circumferential direction and has an arc shape. When assembling these shield segments, a plurality of shield segments are arranged in a zigzag pattern, and a cylindrical segment ring is formed by connecting the circumferential end faces and the axial end faces of each shield segment with bolts. There is.

FIG. 8 shows the appearance of a joint portion of a conventional shield segment which is an object of assembly with bolts. In FIG. 8, reference numeral 80 denotes a shield segment main body (hereinafter referred to as segment), 80a denotes a circumferential end surface of the segment 80, and 80b denotes an axial end surface of the segment 80.

In the conventional segment 80, as shown in the drawing, recesses 81 and 82, which are generally called "unboxing", are formed on the circumferential end surface 80a and the axial end surface 80b, and further, with respect to the respective recesses 81 and 82. Auxiliary metal fittings 83, 84 for bolt fastening are inserted and fixed. And
When assembling the segment ring, refer to FIG.
As shown in (b), another segment 80 'is accessed from the circumferential direction or the axial direction of this segment 80, and the end faces thereof are abutted to each other to form auxiliary metal fittings 83, 83'.
Straight bolt 87 in bolt hole 85, 86 of (84, 84 ')
Or, pass the bent bolt 88, and insert the nut 8 in one recess.
By tightening 9 and repeating this process, a tubular segment ring is formed.

[0005]

However, in the above-described method for assembling the segment ring, as shown in the drawing, it is necessary to form the large recesses 81 and 82 as the bolt receiving portions in the segment 80 itself. Therefore, there is a problem that the strength of the segment itself is low. Also, in this structure, when the shield segment is propelled toward the other segment using an erector (not shown), the load concentrates on the auxiliary metal fittings 83 and 84, and the segment portion around the metal fitting is There is also a problem that the strength of the assembly itself is reduced due to chipping.

Further, in order to assemble a segment ring using a large number of such segments 80, many bolts 87 and 88 must be inserted to fasten the nut 89, and the tightening work is limited and narrow. Since the work is performed in a work environment, the work itself requires a great deal of labor.

In view of the above problems, the present invention can ensure high rigidity of the entire assembled segment ring, and
An object of the present invention is to provide a shield segment joint structure capable of joining segments with little labor.

[0008]

To achieve this object, a joint structure for a shield segment according to the present invention has a plurality of holes formed on the end faces of both shield segments to be joined and one shield segment. A rod-shaped joint member inserted into the formed hole and the hole formed in the shield segment on the other side, and an adhesive that is filled between the joint member and the hole and fixes the joint member to the shield segment. It is characterized by having.

[0009]

[Operation] Insert the joint member into the hole formed in the joint end surface,
By fixing this to the shield segment in the hole with an adhesive, it is possible to reduce the number of defects in the segment as compared with the joining method using bolts / nuts. In addition, since it is not a joint by tightening a nut but a joint using an adhesive action by an adhesive, a small amount of labor is required,
Workability can also be improved.

[0010]

Embodiments of the shield segment joint structure will be described below with reference to the drawings. FIG. 1 shows a ring-shaped segment (segment ring) obtained by assembling a plurality of segments along the shield segment circumferential direction A, and a new shield from the ring axial direction B (that is, the shield tunnel axial direction). Fig. 3 shows a joint structure when joining segments.

In FIG. 1, reference numeral 1 denotes an arcuate shield segment (hereinafter abbreviated as a segment) which constitutes a segment ring, and is formed of a material such as concrete or resin concrete. A plurality of holes 3 are formed in both end surfaces 2 in the axial direction of the segment 1 in a direction substantially perpendicular to the end surface 2 (that is, in the axial direction B). On the other hand, the same hole 13 is formed at a position corresponding to each hole 3 of the segment 1 also on the axial end face 12 of the segment 10 to be joined to the end face 2. These holes 3 and 13 are formed from the respective end faces 2 and 12 to a predetermined depth.

As a means for connecting the segments 1, a rod-shaped joint member 4 is inserted into each hole 3. The joint member 4 is formed of a high-strength resin material reinforced by reinforcing bars, and its cross-sectional shape has an outer diameter dimension substantially equal to the inner diameters of the holes 3 and 13 so as to closely fit the holes 3 and 13. .
Further, a strong adhesive 5 is applied to the outer peripheral surface thereof, which enables the member forming resin material and the segment material to be bonded to each other prior to the member insertion.

2A and 2B show a joining process of the segment 1 and the segment 10 by the joint structure constructed as described above. FIG. 2A shows a state before joining and FIG. 2B shows a state after joining. ing. Then, the bonding is first performed with the adhesive 5
Segment 10 assembled from rod-shaped joint member 4 coated with
Of the segment 1 of the segment 1 to be joined by the segment assembling erector (not shown), and the rod-like joint member 4 is aligned with the shield-propelling jack. The segment 1 is pushed toward the end face 12 of the segment 10 by (not shown). As a result, the rod-shaped joint member 4 is connected to the segment 10
Inserted deeper into the hole 13 of the
It is also inserted into the hole 3 at the same time, and the pushing is performed until both axial end faces 2 and 12 contact each other. Then, after this, due to the bonding action of the adhesive 5, the rod-shaped joint member 4 and the segment 10 in the hole 13
On the other hand, the rod-shaped joint member 4 and the segment ring 1 are fixed in the hole 3, and the segment 1 and the segment 10 are joined via the rod-shaped joint member 4.

As described above, according to the first embodiment of the invention, the rod-shaped joint member 4 having the surface thereof coated with the adhesive 5 is inserted into the holes 3 and 13 formed in the segment 1 and the segment 10, so far. It is possible to easily join the segments together at the shield construction site without the need for complicated work such as bolt tightening, and it is possible to shorten the assembly time and improve the work efficiency. In addition, in the joining mode described above, the rod-shaped joint member 4 is joined in the axial direction B of the tunnel, and the end surfaces 6 of the segment 1 in the circumferential direction A are joined by the conventional bolt joining method (or another joining method). ) Is adopted, however, conversely, the rod-shaped joint member 4 may be used for joining in the circumferential direction A as shown in FIG. In this case, the joining in the tunnel axis direction B may be bolt joining or another joining method. Further, although not shown, the end faces 2 and 6 in both the circumferential direction A and the axial direction B may be joined by the rod-shaped joint member 4.

Further, the illustrated adhesive 5 was applied to the surface of the rod-shaped joint member 4, but if the application of the adhesive is difficult due to the conditions such as construction, as shown in FIG. A thin glass container 7 containing an appropriate amount of adhesive 5
Prior to inserting the joint, it is put in the holes 3 and 13, and when the segments 1 are butted against each other, the container 7 is broken by the rod-shaped joint member 4, so that the adhesive 5 flows out and is filled between the joints and the segments. You may do it. In this figure, an annular protrusion 4a is provided on the surface of the rod-shaped joint member 4, and when the hole 3 and the joint member 4 are fitted, the protrusion 4a bites into the inner wall surface of the hole 3 so that the joint member 4 4 and segment 1
Consideration has been given to further enhance the joint strength of the.

Next, a joint structure as a second embodiment of the present invention different from the above-mentioned joint structure will be described. FIG. 5 shows the external appearance of the segment and the rod-shaped joint that constitute this joint structure. In addition, in this figure, the same components as those of the joint structure of the first embodiment are designated by the same reference numerals.

According to this embodiment, of the two segments to be joined, one of the segments 1 is a segment 1
A hole 3 is formed so as to extend obliquely from the inner peripheral surface 8 to the end surface 2 (provisionally an axial end surface) to be joined. On the other hand, on the end face 12 of the other segment 10, the end face 1 is located at the end face position aligned with the hole 3 in the segment joining state.
From 2 to the outer peripheral surface 14 of the segment, a hole 13 obliquely penetrating is formed. These holes 3 and 13 are aligned so as to form the same axis in the segment joined state. Further, in the rod-shaped joint member 4 used in the present embodiment, as shown in the drawing, one end surface 4b has a joint axis line 4
It is formed obliquely with respect to A, has an outer diameter substantially equal to the inner diameters of the holes 3 and 13 as in the first embodiment, and is made of a high-strength resin material reinforced with a reinforcing material.

In this connection, the end face 3 of the segment 1 is first abutted against the end face 13 of the segment 10 by using the segment assembling erector, and then the bar-shaped joint member 4 is used.
The adhesive 5 is applied to the outer surface of the segment 1 and is inserted into the hole 3 from the inner peripheral surface 8 of the segment 1 until the tip slope 4b of the joint member 4 is flush with the outer peripheral surface 14 of the segment 10 as shown in FIG. The other end surface 4b is pressed. In this embodiment, the other end surface 4c is set perpendicular to the joint axis 4A to facilitate this pressing. Then, when the holes 3 and 13 are positioned at the predetermined positions in this way, the resin-based adhesive 15 is filled into the excess space in the hole 3 that is not occupied by the joint member 4, and eventually the outer surface of the joint is covered. As the adhesive 5 hardens, the two segments 1 and 10 are joined via the rod-shaped joint member 4.

As described above, according to the second embodiment of the present invention,
First, the two segments 1 and 10 are butted to each other, and then the rod-shaped joint member 4 as a joining means is inserted from the inside to easily join the segments. It will be possible to install joints at the shield construction site. Also, as in the first embodiment,
Since the segment joining is performed through the adhesive 5, the segment assembly time and work efficiency can be significantly improved as compared with the bolt fastening method. When the rod-shaped joint member 4 is inserted into the segments 1 and 10, since the holes 3 and 13 are both through holes, the joint member 4 causes the air in the hole 13 to escape to the segment outer peripheral surface 14 side. It is possible to insert the joint smoothly.

FIG. 7 shows an arrangement example of the holes 3 and 13 into which the rod-shaped joint member 4 is inserted. Here, assuming that the rod-shaped joint member 4 described above is used for joining the circumferential end faces 6 of the segments and joining the axial end faces 2, 12 of the segments, the through holes 3, 13 in the oblique direction are provided.
Are formed. As a matter of course, as a modification, the joint structure according to the present embodiment may be applied only to the joining in the tunnel axial direction or the circumferential direction, or the joint structure according to the first embodiment described above may be combined. .

[0021]

As described above, according to the present invention, the joint member is inserted into the hole formed in the joint end surface, and the joint member is fixed to the shield segment in the hole by the adhesive, thereby interposing the metal fitting. Compared with the conventional segment joint structure by bolt fastening, it is possible to reduce the number of defects in the segment, and it is possible to reduce the labor and material cost at the time of manufacturing the segment. In addition, since the rod-shaped joint is integrated with the segment by an adhesive, it can be attached at the shield construction site, and there is no problem of joint deformation during segment transportation. In addition, segment assembly time can be significantly reduced and work efficiency is improved.

[Brief description of drawings]

FIG. 1 is an external perspective view of a shield segment showing a joint structure as a first embodiment of the present invention.

FIG. 2 is an external view showing the segment of FIG. 1 before and after joining in the tunnel axis direction.

3 is an external view showing a circumferentially joined state of the segments in FIG. 1. FIG.

FIG. 4 is an external view showing a modified example of the segment rod-shaped joint of FIG.

FIG. 5 is an external perspective view of a shield segment showing a joint structure as a second embodiment of the present invention.

6 is a cross-sectional view of the segment joint portion of FIG.

FIG. 7 is an external view of a segment used in the second embodiment.

FIG. 8 is an external perspective view of a conventional segment portion.

9 is a cross-sectional view of the joint portion of FIG.

[Explanation of symbols]

 1,10 Shield segment 2,12 Axial end face 3,13 Hole 4 Bar-shaped joint member 5,15 Adhesive 6 Circumferential end face 10 Adhesive A Segment circumferential direction B Shield tunnel axial direction

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naomichi Sawada 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. A joint structure for joining circumferential end faces or axial end faces of adjacent shield segments, wherein a plurality of holes are formed in the end faces of both shield segments to be joined, A rod-shaped joint member that is inserted into the hole formed in the shield segment and the hole formed in the shield segment on the other side, and is filled between the joint member and the hole, and the joint member is fixed to the shield segment. A joint structure for a shield segment, comprising: 2. The hole is formed obliquely from the inner peripheral surface of one shield segment toward the joint end surface, and is obliquely formed in the other shield segment from the joint end surface toward the segment outer peripheral surface. The joint structure for a shield segment according to claim 1, wherein: 3. The joint structure for a shield segment according to claim 1, wherein a plurality of protrusions are formed on the surface of the joint member.