JP2001234696A - Joint for segment, and segment provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for a segment by which segments can be easily and securely connected to each other by a single pass, and in which execution such as retightening is not necessary, and a segment provided with the joint. SOLUTION: This joint for a segment is provided with a female member 4 fixed to an end part of a segment, and a male member 3 provided with a protruded part 10 protruded from a segment end part of an adjacent segment, a connection part 10a provided to be adjacent to the protruded part 10, a support member 11 having an opening part 14 for movably holding the connection part 10a, and a protrusion 15 along the opening part 14, a fixed member 12, and an elastic member 13 disposed between the support member 11 and the fixed member 12, and connects adjacent segments to each other by the protrusion 15 in the support member 11 and the fixed member 12 in contact with each other, and this segment is provided with the joint for a segment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lining of an inner wall of an underground cavity such as a shield tunnel, and more particularly, to a segment joint used for connecting segments.
The present invention relates to a segment provided with the joint and a segment connecting method.

[0002]

2. Description of the Related Art The shield method is used for constructing tunnels and tunnels. A shield machine is used to abut a face of the tunnel to excavate a hole in the basement, and the inner wall of the hole is covered with a segment ring. It is a method of constructing tunnels and tunnels, and it is characterized by safe and reliable work.

[0003] The segment ring used in the shield method is usually transported into a hole in a state of being divided into a plurality of segments, and is assembled along the inner diameter of the hole at a construction site. For this reason, it is desired that the segments can be easily connected. At the same time, it is desired that the joint is not exposed on the inner surface of the tunnel from the viewpoint of durability and the like.

The connection between segments is described in, for example,
As disclosed in JP-A-146794 and JP-A-8-021195, a threaded pin is provided in one segment so as to be able to protrude and retract, and this is passed through an opening provided in the other segment and tightened with a nut.

In Japanese Patent Application Laid-Open No. 3-021195, a male cotter fitting or a female cotter fitting is provided on the opposing surface of a segment, and a male tenon and a male tenon are provided on the opposing surface of another segment. Are arranged, these are fitted to each other, and the segments are connected by passing bolts through the female tenon and the male tenon.

However, when the segments are fastened using pins, bolts, and nuts, it is necessary to perform an operation of fastening the nuts. In addition, if the positions and angles at which these components are mounted deviate, the pins and bolts will not fit into the nuts. Therefore, it is necessary to strictly control the processing accuracy, the mounting positions, and the installation positions of the segments.

In the method disclosed in Japanese Patent Laid-Open No. 3-021195, segments may not be connected if the positions of the female tenon and the male tenon are shifted for the same reason. It is necessary to strictly control both the installation positions of the segments.

In the conventional example using the above-described pin and nut, it is necessary to complicate the connection structure such as exposing a tip of a bolt or a pin by depressing a part of an upper surface or a lower surface of a segment to mount the nut. Therefore, there is also a problem that the segment cost increases. Also, depending on the purpose of use of the tunnel, it may be necessary to perform secondary lining to fill these depressions. Also, because the nut is loosened,
It is also necessary to perform a post-process of retightening the nut.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a width in machining accuracy, a mounting position on a segment, and a mounting position of a segment, and simplifies a connecting structure. In addition, by eliminating the post-process, the connection between the segments can be easily and reliably performed, the segment ring can be assembled in one pass, and various metal fittings are not exposed in the tunnel, and a smooth inner surface can be obtained. It is an object of the present invention to provide a joint for a segment that can be constructed at low cost and that can prevent a change in fastening force with time, and a segment including the joint for a segment.

[0010]

The above object of the present invention is achieved by providing a joint for a segment of the present invention and a segment provided with the joint for a segment.

That is, according to the first aspect of the present invention, there is provided a segment joint for connecting a plurality of segments in a circumferential direction to cover an underground cavity surface, wherein the joint extends in the tunnel axial direction. A female member provided with a groove and fixed to the end of the segment, a protrusion protruding from the end of the segment, a connecting portion adjacent to the protruding portion, and an opening for movably holding the connecting portion Provided with a supporting member, a fixing member, and a male member including an elastic member disposed between the supporting member and the fixing member, and a side of the supporting member that contacts the elastic member. A segment joint is provided, wherein a projection is provided along the opening, and the projection and the fixing member contact each other to generate a fastening force for connecting adjacent segments.

According to the invention of claim 2 of the present invention, the receiving groove has a slot in which the insertion portion of the protrusion is widened, and the male groove is inserted as the protrusion is inserted in the tunnel axial direction. A segment joint is provided, which is provided with a taper for increasing a fastening force to a member.

According to a third aspect of the present invention, there is provided a segment joint, wherein the elastic member has an opening for accommodating the projection.

According to a fourth aspect of the present invention, there is provided a segment joint, wherein the thickness of the elastic member is at least equal to the height of the projection.

According to the invention of claim 5 of the present invention, a segment for connecting a plurality of segments in the circumferential direction to cover the underground cavity surface, and provided with an accommodation groove extending in the tunnel axial direction. And a female member fixed to the end of the segment, a protruding portion protruding from the end of the segment, a connecting portion adjacent to the protruding portion, and an opening for movably holding the connecting portion. A supporting member, a fixing member, and a male member including an elastic member disposed between the supporting member and the fixing member. The opening portion is provided on a side of the supporting member that contacts the elastic member. Along with a projection,
A segment is provided in which the female member and the male member generate a fastening force for connecting segments adjacent to each other by the contact between the protrusion and the fixing member.

According to the sixth aspect of the present invention, the receiving groove is formed such that the insertion portion of the protrusion is widened, and the receiving groove is fastened to the male member as the protrusion is inserted in the tunnel axial direction. A segment is provided, characterized by a taper of increasing force.

According to the invention of claim 7 of the present invention, there is provided the segment, wherein the elastic member has an opening for accommodating the projection.

According to an eighth aspect of the present invention, there is provided the segment, wherein the thickness of the elastic member is at least equal to the height of the projection.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing that segments are connected to each other in a circumferential direction using a segment joint of the present invention to form a segment ring. FIG.
In (a), a segment ring 1 includes a plurality of segments 2.
Are connected to each other to extend along the circumferential direction of the drilled hole, and a segment joint of the present invention, which will be described in more detail later, is fixed to an end of the segment ring 1. Is shown.

FIG. 1 (b) shows a segment 2 for forming a segment ring 1. The segment 2 has an end 2a having a predetermined length in the circumferential direction, and an excavated tunnel 2a. Segment ends 2b and 2c extending substantially in the axial direction of the tunnel. Segment end 2
In a, a joint (not shown) may be provided to connect the plurality of segment rings 1 in the tunnel axial direction. The segment joint of the present invention is fixed to the segment ends 2b and 2c of the segment 2 shown in FIG. 1 (b), and the male member 3 is shown in FIG. 1 (b). On the other hand, FIG. 1A shows the arrangement of the female member 4 of the segment joint according to the present invention. The segment 2 of the present invention may be made of steel, or may be made of reinforced concrete. Further, as shown in FIG. 1 (a), a groove 5 is provided in the segment end portions 2b and 2c adjacent to the female member 4, and when the segments are connected from the axial direction, the male member 3 is temporarily It is intended to be accommodated.

When the segment ring 1 is constructed, the male member 3 and the female member 4 of the segment joint shown in FIGS.
And the segment ring 1 is sequentially extended in the circumferential direction. The segment joint fixed to the segment ends 2b and 2c of the segment 2 is as follows.
As shown in FIG. 1 (b), one segment end 2b
The male member 3 can be arranged at the segment end 2c and the female member 4 can be arranged at the segment end 2c facing in the circumferential direction. However, it is also possible to arrange the male member 3 at both of the segment ends 2b and 2c which are spaced apart in the circumferential direction of the segment 2, and in such a case, the other segments connected to this segment 2 include It is necessary to arrange and connect the female members 4 to both ends of the segment. Further, steps having any shape may be formed in the segment ends 2b and 2c so as to be compatible with each other when adjacent segments are connected.

FIG. 2 shows a state in which the adjacent segments 6 and 7 are fixed in a state where the male member 3 and the female member 4 constituting the segment joint described in FIG. 1 are connected. FIG. In FIG. 2, the tunnel axis is in a direction along the vertical direction with respect to the paper surface. The segment 6 is a segment in which the male member 3 is embedded, and the segment 7 is a segment in which the female member 4 is embedded. As shown in FIG. 2, the male member 3 and the female member 4 are connected to anchor bars 8a, 8b and 9 respectively.
a and 9b show that they are firmly fixed to the segment.

As shown in FIG. 2, the male member 3 has a projection 10 projecting from the segment end 2b,
0, a supporting member 11 for holding the connecting portion 10a movably, a fixing member 12, and an elastic member 13 disposed between the supporting member 11 and the fixing member 12. ing. The connecting portion 10a is provided with a screw that is screwed with a nut 12a used as a fastening member attached to the fixing member 12 on the opposite side of the protruding portion 10 to hold the protruding portion 10 via the connecting portion 10a. ing. In the embodiment of the present invention, the protruding portion 10 and the connecting portion 10a are illustrated as a bolt-shaped member integrally formed, but the protruding portion 10 and the connecting portion 10a are formed as separate bodies, and are welded. It is possible to integrate them by screwing or other appropriate methods and use them as different shapes and configurations.

The support member 11 generates a fastening force when the protrusion 10 is fitted into the female member 4 in cooperation with the fixing member 12. The support member 11 has an opening 14 for holding the connecting portion 10a movably.
Is provided, and when the protruding portion 10 is inserted toward the inner side of the paper surface which is the tunnel axis direction at the time of fastening,
The projecting portion 10 is relatively moved toward the female member 4 to generate a fastening force between the support member 11 and the fixing member 12.

A protrusion 15 extending along the opening 14 is provided on the side of the support member 11 which contacts the elastic member 13. In FIG. 2, the projection 15
And a portion that contacts the fixing member 12 and provides a fastening force when the male member 3 and the female member 4 are firmly connected to each other. The protrusion 15 does not necessarily need to be disposed adjacent to the inner peripheral surface of the opening 14, and can be set as appropriate, such as being disposed at a position separated from the inner peripheral surface of the opening 14. As shown in FIG. 2, when the segments are connected to each other, the elastic member 13 disposed between the support member 11 and the fixing member 12 is used.
Is compressed, and the protrusion 15 and the fixing member 12 are shown to be in contact with each other. This elastic member 13 can be formed from various polymer materials. Specifically, for example,
Any known material such as vulcanized natural rubber, synthetic rubber such as neoprene rubber or chloroprene rubber, or shape memory resin such as polynorbornene can be used. In the present invention, it is desirable to use natural rubber, particularly vulcanized natural rubber, from the viewpoint of properties and cost.

Before the segments are connected to each other, the elastic member 13 allows the protrusion 10 and the connecting portion 10a to move toward the female member 4 by further compressing the elastic member 13. Is held. Further, the elastic member 13 is used to connect the protrusion 10 to the female member 4 before the segments are firmly connected.
The alignment between the protrusion 10 and the female member 4 is facilitated,
The protrusion 10 is held so as to be slightly displaced so as to further facilitate the fitting. By using the elastic member 13 described above, the protrusion 10 can be held without giving a play more than necessary, and the protrusion 10 can be displaced as necessary. Connection work can be facilitated.

The above-mentioned elastic member 13 may be simply inserted between the supporting member 11 and the fixing member 12, or may be an adhesive or the like attached to either or both of the supporting member 11 and the fixing member 12. May be bonded together. As the adhesive that can be used at this time, any adhesive known so far can be used.

As shown in FIG. 2, the female member 4 is embedded in the segment 7 and has a housing groove 16 for housing the protrusion 10 of the male member 3. This accommodation groove 16
The connecting portion 10 of the male member 3 is
a is formed movably, and when the segments 6 and 7 are connected, the protrusion 10 and the member 17 are connected.
Cooperate to connect the male member 3 and the female member 4. One end of the slot 18 has a protrusion 10 and a connecting portion 1.
A wide portion formed wider than the slot width shown in FIG. 2 is provided to facilitate insertion of Oa. Further, as the protruding portion 10 is inserted into the locking portion 17 toward the back side of the drawing, a force is applied to the support member 11 via the protruding portion 10, the connecting portion 10a, and the fixing member 12. The taper is provided so that the fastening force to the male member 3 can be gradually generated.

FIG. 3 is a top cross-sectional view of the segment connecting portion showing the configuration of the slot 18 and the locking portion 17 in more detail. In FIG. 3, the tunnel axis is indicated by an arrow B
It extends in the direction shown by. As shown in FIG. 3, the male member 3 and the female member 4 are disposed so as to be slightly inclined with respect to the tunnel axis. Further, the locking portion 17 is formed so as to gradually increase in thickness in the insertion direction of the protruding portion 10 indicated by the arrow B so as to conform to the above-described inclination of the segment end 2c.

FIG. 3 shows that one end of the locking portion 17 is opened toward the groove 5 into which the protrusion 10 is first inserted when connecting the segments. With the above-described configuration, it is possible to easily join the segments 6 and 7, and furthermore, the fastening force changes according to the degree of fitting, and the projections 15 and the fixing members 12
And a predetermined strain is applied to the support member 11 so that spring elasticity for firmly joining the segments 6 and 7 can be obtained. Further, it is shown that other members 19 for improving the proof stress of the female member 4 are formed by welding or integrally with the female member 4 in addition to the locking portion 17. The separate member 19 may have any known configuration.

FIG. 4 is a sectional view showing the above-mentioned engaging portion 17 of the female member 4 used in the present invention in detail. In FIG.
The locking portion 17 has a substantially U-shape, and is formed with the groove 5 so that the protruding portion 10 can be inserted. Therefore, the extension portion 17a is different from the extension portion 17b shown on the upper side in FIG. Has also been shortened. Further, the extension portion 17a has a connecting portion 10a.
Is provided, and is tapered as described above, so that the fastening force is increased according to the degree of insertion of the protruding portion 10 and the connecting portion 10a. Also, in FIG.
It is shown that the locking surface 17c on the side where the projection 10 of the 8 abuts is chamfered so as to make it easier to insert the projection 10 and the extension 10a. I have. However, this chamfering is not always required. Further, FIG.
A wide portion 17d is shown to be formed at the insertion-side end of "a".

FIG. 5 is a front view showing the locking portion 17 shown in FIG. 4 when viewed from the male member 3 side. As described in FIG. 4, the extension 17a is
Groove 5 for initial insertion of the projection 10
Are formed. FIG. 5 shows a chamfering process and a wide portion 17d formed on the extension portion 17a. The extension portion 17a is connected to the extension portion 17b via a plurality of separate members 20 so as to obtain necessary strength.
Are formed integrally with each other by welding or
0 is indicated by a dashed line in FIG. FIG. 5 shows that the extension portion 17b is chamfered or curved, but the chamfering or curved surface processing for the extension portion 17b is not necessarily required.

FIG. 6 is a diagram showing the support member 11, the fixing member 12, and the elastic member 13 constituting the male member 3 of the present invention in detail. FIG. 6A is a cross-sectional view of the support member 11, and shows that the elastic member 13 is placed on the support member 11 while accommodating the protrusion 15. The support member 11 includes a support portion 11a and reinforcing portions 11b, 11b.
c and 11d are integrally formed, and the support portion 11a has an opening 14 through which the connecting portion 10a is inserted.
Is formed. A projection 15 is formed along the opening 14 on the side on which the elastic member 13 is placed so as to be adjacent to the opening 14. The projection 15 is shown in FIG. 6 as having a rectangular cross section, but may have any other shape and size as long as the required fastening force can be stably generated. Is also good. Further, the projection 15 does not need to extend over the entire circumference of the opening, and may be appropriately segmented and arranged.

In forming the projections 15, various methods can be used. For example, the protrusion 15 can be formed by welding a washer having the same inner diameter as the diameter of the opening 14. Further, when forming the support member 11, the projection 15 can be formed integrally. The elastic member 13 has an opening 1 for accommodating the projection 15.
3a is provided. The thickness of the elastic member 13 is such that the thickness in a free state is greater than the height of the protrusion 15 described above, and is the same as the height of the protrusion 15 due to the fastening force when connecting the segments. It is necessary that the protrusion 15 and the fixing member 12 are compressed to a pressure so that the protrusion 15 and the fixing member 12 come into contact with each other to generate a necessary fastening force.

FIG. 6B shows the fixing member 12 constituting the male member 3. The fixing member 12 is square, rectangular, circular,
It comprises a polygonal support plate 12a and a nut 12b, which is a fastening member welded onto the support plate 12a. In addition, the support plate 12a has
An opening 12c is provided which extends from the protruding portion 10 and through which a connecting portion 10a provided with a screw screwed with a nut 12b is inserted. The connecting portion 10a of the embodiment of the present invention formed as a bolt-shaped member is screwed with the nut 12b to compress the elastic member 13.

FIG. 7 is a front view showing the support portion 11a on which the elastic member 13 of the support member 11 is placed. An opening 14 through which the connecting portion 10a is movably inserted is formed at the center of the support portion 11a. This opening 1
A projection 15 is formed along the end face of the projection 4 so as to surround the opening 14. The elastic member 13 is further provided with an opening 13a for accommodating the projection 15 to facilitate the mounting of the elastic member 13 and to prevent the compression of the elastic member 13 from being hindered by the projection 15. It can be performed uniformly. FIG. 7 shows the arrangement of the anchor streaks 8a and 8b used for further firmly fixing the male member 3 to the segment 7 by broken lines. The arrangement positions and the number of the anchor streaks 8a and 8b can be appropriately set so that a predetermined proof stress can be obtained as appropriate.

FIG. 8 is a diagram showing the elastic member 13 used in the present invention in detail. FIG. 8A is a top view of the elastic member 13, and FIG. 8B is a side sectional view of the elastic member 13. The elastic member 13 used in the present invention can be appropriately formed of an elastic material such as natural rubber as described above. Its thickness must be greater than the projections 15 in the free state, and the projections 10 and the connecting parts 10 until the segments are joined together.
a so that the support member 1 can be displaced flexibly.
1 and the fixing member 12 are compressed. The outer shape of the elastic member 13 shown in FIG. 8 is not necessarily limited to a circle, and any other shape such as a rectangle and a polygon can be used. The size of the opening 13a for accommodating the projection 15 is not particularly limited, and can be set as appropriate.

FIG. 9 is a diagram showing in detail the generation of the fastening force in the male member 3 when the segments are connected to each other. FIG. 9A shows a state in which the connecting portion 10a is screwed to the fixing member 12, but the elastic member 13 is not compressed, and FIG. 9B shows an arrangement immediately before being attached to the segment. FIG. As shown in FIG. 9A, the elastic member 13 which is initially in a free state is provided.
When connecting the segments, in consideration of the taper described in detail in FIG. 4, at a position where a predetermined stress can be applied to the support portion 11 a via the projection 15 at the final joining position. Compressed to some intermediate compression state. FIG. 9B shows this intermediate compression state. In the intermediate compression state shown in FIG. 9B, the support member 12a of the fixing member 12 does not abut on the protrusion, and only the elasticity of the elastic member 13 is fixed to the support portion 11a of the support member 11. The member 12 is separated from the support member 12a. By setting such an intermediate compression state, the protrusion 10 and the extension 10a extending from the protrusion 10 can be displaceably held by the clearance between the support member 11 and the fixing member 12. It becomes possible.

Further, in the embodiment described in the present invention, when connecting the segments, first, as shown in FIG. 3, the projecting portion 10 is inserted into the groove 5 formed by the female member 4 and the concrete. Then, the connecting portion 10a together with the projecting portion 10 is accommodated in the accommodation groove 16 and the slot 18 respectively.
Insert along arrow B. As the insertion of the protruding portion 10 and the connecting portion 10a proceeds, the segments adjacent to each other are configured to have the segment ends 2b and 2c slightly inclined with respect to the tunnel axis as shown in FIG. Therefore, the protruding portion 10 is relatively drawn toward the female member 3 side. As the protrusion 10 is relatively drawn toward the female member 4, the protrusion 10
The connecting portion 10a extending from the elastic member 13 displaces the projecting portion 10 while compressing the elastic member 13 toward the female member 4 by an amount corresponding to the amount of taper described above.

The segments are connected as described above,
At the final connection position, as shown in FIG. 10, the support member 12 a of the fixing member 12 and the projection 15 formed on the support portion 11 a of the support member 11 come into contact with each other and are localized in the opening 14. Thus, stress is generated. Due to this stress, the vicinity of the opening 14 is slightly deformed, and it is possible to generate spring elasticity for appropriately connecting the segments. At this time, the length of the slot 18 in the tunnel axis direction can be given some allowance,
It is also possible to adjust the fastening force according to the degree of insertion of the protrusion 10.

FIG. 11 is a diagram showing, by dashed lines, a portion where distortion due to the stress applied as described above, that is, a portion where spring elasticity occurs. In addition, the part which gives spring elasticity is expanded and shown for convenience of explanation. In FIG.
The direction of the stress is denoted by F. As shown in FIG. 10, in the present invention, the fastening force of the segments is given by deformation of the support portion 11 a of the support member 11. In addition, since the protrusion 10 and the connecting portion 10a are displaceably held by the elastic member 13 before this fastening is performed, tolerance is given to the alignment between the male member 3 and the female member 4. This makes it easier to join the segments. In addition, the spring between the segments
Since the member constituting the male member 3 is obtained by local deformation without using another member such as a spring, a fastening force between segments due to a temporal change such as creep generated when another member such as a spring or a spring is used. Can be prevented from decreasing.

Although the present invention has been described with reference to the embodiment shown in the drawings, the present invention is not particularly limited to the embodiment described above.
b, 2c, there may be provided a step extending in the circumferential direction so as to fit each other, and the shapes, relative dimensions, shapes, and protrusions of the male member 3 and the female member 4 may be provided. And the configurations of the protruding portion and the connecting portion can also be appropriately set.

[0043]

As described above, according to the present invention, the width of the machining accuracy, the position of attachment to the segment, and the position of the segment is increased, the connection structure is simplified, and the joint is formed on the inner surface of the tunnel. It is possible to smooth the inner surface of a structure such as a tunnel without exposing it, and to simplify the segment structure, so that costs can be reduced, and furthermore, it is possible to adjust the fastening force. Therefore, additional tightening is not required, the fastening force can be stabilized for a long time, and assembly can be performed in one pass, so that a simple and easy-to-use segment joint and a segment joint can be provided.

[0044]

[Brief description of the drawings]

FIG. 1 shows a segment ring constructed according to the present invention;
The figure which showed the segment.

FIG. 2 is a side cross-sectional view showing a state where the male member and the female member of the segment joint according to the present invention are connected to each other.

FIG. 3 is a top sectional view of the segment joint of the present invention.

FIG. 4 is a partial sectional view of a female member used in the present invention.

FIG. 5 is a front view of a female member used in the present invention.

FIG. 6 is an exploded view of a male member used in the present invention.

FIG. 7 is a diagram showing an arrangement of elastic members used in the present invention.

FIG. 8 is a detailed view showing an elastic member used in the present invention.

FIG. 9 is a view showing a male member according to the present invention.

FIG. 10 is a view showing the male member of the present invention in a final tightening position.

FIG. 11 is a view for explaining the operation of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Segment ring 2 ... Segment 2a, 2b ... Segment end part 3 ... Male member 4 ... Female member 5 ... Groove 6 ... Segment 7 ... Segment 8a, 8b ... Anchor bar 9a, 9b ... Anchor bar 10 ... Protrusion 11 ... Support Member 11a Support portion 11c Reinforcement portion 11c Reinforcement portion 12 Fixing member 12a Support member 12b Nut 12c Opening 13 Elastic member 13a Opening 14 Opening 15 Projection 16 Housing groove 17 Locking portion 17a ... Extended part 17b ... Extended part 17c ... Locking surface 17d ... Wide part 18 ... Slot 19 ... Separate member 20 ... Separate member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroo Iso 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Corporation (72) Inventor Noriyuki Arai 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu (72) Inventor Katsumi Hosokawa 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Incorporated (72) Inventor Hiromi Tsuboi 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Nosho Machida 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Building Co., Ltd. (72) Inventor Kiyoshi Takagi 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Building Inside the company (72) Inventor Kenji Minohe 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Ikuo Oe 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction F-ta 2D055 BA01 EB01 GC04

Claims (8)

[Claims] 1. A segment joint for connecting a plurality of segments in a circumferential direction to lining an underground cavity surface, wherein a joint groove extending in a tunnel axial direction is provided and fixed to an end of the segment. A female member, a protruding portion protruding from the segment end, a connecting portion adjacent to the protruding portion, a supporting member provided with an opening for movably holding the connecting portion, a fixing member, A male member including an elastic member disposed between the support member and the fixed member, and a projection along the opening is provided on a side of the support member that contacts the elastic member, A joint for a segment, wherein a projection and a fixing member contact each other to generate a fastening force for connecting segments adjacent to each other. 2. The accommodation groove has a slot in which an insertion portion of the protrusion is widened, and a taper which increases a fastening force to the male member as the protrusion is inserted in a tunnel axial direction. 2. The device according to claim 1, wherein
The joint for a segment according to 1. 3. The segment joint according to claim 1, wherein the elastic member has an opening for accommodating the projection. 4. The segment joint according to claim 1, wherein the thickness of the elastic member is at least the height of the projection. 5. A segment for connecting a plurality of segments in a circumferential direction to lining a surface of an underground cavity, wherein the segment is provided with an accommodation groove extending in a tunnel axial direction and fixed to an end of the segment. A female member, a projecting portion projecting from the segment end, a connecting portion adjacent to the projecting portion, a supporting member provided with an opening for movably holding the connecting portion, a fixing member, and the supporting member. A male member including an elastic member disposed between the member and the fixing member, and a projection along the opening is provided on a side of the support member that comes into contact with the elastic member; A segment wherein the female member and the male member generate a fastening force for connecting adjacent segments by contact with a fixing member. 6. The accommodation groove has a slot in which an insertion portion of the protrusion is widened, and a taper that increases a fastening force to the male member as the protrusion is inserted in the tunnel axial direction. 6. The device according to claim 5, wherein
Segment described in. 7. The segment according to claim 5, wherein the elastic member has an opening for accommodating the projection. 8. The segment according to claim 5, wherein a thickness of the elastic member is at least equal to a height of the projection.