JPH11236797A - Segment and joining method of segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform joining without lowering strength and without biasing and loosening at a plurality of axial parts and need no blocking working of a recess part in an inner face side. SOLUTION: A joining fitting 2 formed in a C-shape is provided on a joint end face 1a for the circumferential direction of a segment 1 and an opening part 11 is provided on the side of an adit entrance in the excavation hole axis direction. One engaging part 6 of an I-shaped connection fitting 3 having the engaging part 6 on both the side parts is inserted in the opening part 11 of the joining end face 1a' of one side of the segment 1 assembled on a tunnel wall body, moved to a cutting face side in the direction of the excavation hole axis, and inserted in the engaging space 7 of the joining fitting 2. An opening part closing member 12 comprising an elastic material on the opening part 11 is fitted and movement for the side of the opening part 11 of a connection fitting 3 is regulated. The other segment 1 is drawn near while the other engaging part 6 of the connection fitting 3 is inserted in the opening part 13 of the joining end face 1a" of the other side, and the engaging part 6 is inserted in the engaging space 7 of the connection fitting 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment forming a cylindrical wall in the axial direction of a drilled hole by connecting a plurality of segments to each other, and a method of joining the segments.

[0002]

2. Description of the Related Art As a method of constructing a tunnel, a so-called shield method is generally employed, in which a segment (mainly made of concrete or steel) is assembled on the inner surface side of an excavation hole to construct a cylindrical wall. As the segments used in this shield method, those having a plane rectangular shape and an arc plate shape are mainly used, and these segments are joined to each other by bolts. As a structure for joining the segments with the bolts, a joint plate having holes communicating with each other when the joint surfaces of the segments are brought into contact with each other is buried in the vicinity of the joint surface of the segments, and these joint plates are embedded. In general, a bolt is inserted into a hole of the above, and a nut is fastened and joined to the bolt. Further, there is also a structure in which an insert fitting as a nut member is embedded in each segment, and bolts penetrating adjacent segments are fastened to each other for joining.

However, in such a structure, a bolt is inserted into a hole formed in a joint surface of a joint at a construction site, a nut is fastened to the bolt, or a bolt is inserted into an insert fitting embedded in each segment. Therefore, there is a limit in shortening the assembling time, and it is difficult to adapt to automatic assembling by a robot. Furthermore, even if the secondary lining is omitted, it is necessary to close the bolt box formed in the segment in order to install the bolt and nut, and a new joint is aimed at speeding up the construction and saving labor. At present, the development of the structure was urgently needed.

Here, as a joining structure for joining the segments very easily, C-shaped fittings are embedded at positions opposing the joining surfaces of the segments, and both ends are engaged with these C-shaped fittings. A structure has been developed in which C-shaped fittings are connected to each other by I-shaped fittings by joining the I-shaped fittings, and the joining surfaces of the segments are joined to each other, for example, JP-A-7-269297. A groove-shaped member having a C-shaped cross-section extending along the axial direction of the excavation hole is provided over the entire width of the segment on the joint surface in the circumferential direction of the segment, and the joint surfaces in the circumferential direction of the segment are butted together. In this case, an I-shaped engaging member is inserted into an engaging hole formed by the groove to connect the groove-shaped members to each other.

[0005]

However, in the case of such a structure in which the groove-shaped member having the C-shaped groove is provided over the entire width of the segment, the engagement is required unless the groove-shaped member is formed with high precision. The connection strength of the members is deviated along the width direction.

In this case, for example, Japanese Patent Application Laid-Open No. 9-19568
No. 9 and Japanese Unexamined Patent Publication No. 9-242483, etc., a C-shaped bracket is provided on the joint surface in the circumferential direction of the segment at intervals in the axial direction of the excavation hole, and the circumferential direction of the segment is provided. With the joining surfaces to
If I-type (H-type) metal fittings are fitted to each other in the axial direction of the excavation hole and the C-shaped metal fittings are connected to each other, the segments can be joined at a plurality of locations in the width direction of the segments. The segments can be joined in the circumferential direction without bias. In this case, in order to engage the I-shaped metal fitting with the C-shaped metal fitting, it is necessary to push in the axial direction with a push rod, and the work is extremely difficult. It was complicated and unsuitable for automatic assembly.

Further, as shown in Japanese Patent Application Laid-Open No. 7-35596, a concave portion is formed on the inner surface side when the inner surface side of the joint surface of the segment is cut out and the joined surfaces of the segments are butted together. As described above, there is also a structure in which the I-shaped fitting is respectively fitted from the concave portion to the C-shaped fitting on the entrance side and the face side, but by cutting the inner surface side of the joining surface in this manner, the vicinity of the joining surface of the segment can be obtained. In addition, there is a problem that the strength of the above-described method is reduced, and that the work of closing the concave portion formed on the inner surface side must be performed.

Further, Japanese Patent Application Laid-Open Nos. 8-93391, 8-184296 and 63-118497
No., Japanese Utility Model Publication No. 64-47899, etc.
A technique is also disclosed in which a plurality of C-shaped fittings are provided at intervals on a joining surface, and an I-shaped fitting is fitted from the inner surface side of the segment in a state where the joining surfaces of the segments are abutted. Since an opening is formed, there has been a problem that the closing operation has to be performed.

[0009] The present invention has been made in view of the above circumstances, it is possible to very easily join without unevenness or looseness at a plurality of locations in the axial direction, without causing a decrease in strength, and furthermore, on the inner surface side It is an object of the present invention to provide a segment and a joining method of the segment that do not need to perform the work of closing the recess.

[0010]

In order to achieve the above object, a segment according to claim 1 is a segment which is joined together with its joining end faces together to form a tunnel wall, A joining metal fitting having a pair of hook-shaped engaging portions each formed on a joining end surface joined to each other in the circumferential direction and having an engaging piece portion whose ends are bent inward, and the joining metal fitting; An opening formed on the side of the joint and communicating with an engagement space formed between the engaging portions of the joint, wherein the joint is provided on both sides of a plate-like coupling body. The connection fitting is provided in the engagement space and is connected by a connection fitting having an engagement portion that engages with the locking piece, and the connection fitting is connected to the connection fitting from the opening into the engagement space. By inserting the engagement portion on one side, the connection fitting It is characterized by being retained.

According to a second aspect of the present invention, in the segment of the first aspect, an opening closing member for closing the opening is fitted into the opening. The segment according to claim 3 is the segment according to claim 1 or 2, wherein one side of the joining fitting is provided between the inner surface of the engagement space and the outer surface of the engagement portion to the engagement space. It is characterized in that a holding member for holding the connecting fitting into which the engaging portion is inserted is provided.

The segment described in claim 4 is the segment described in claim 1.
4. The segment according to claim 3, wherein a holding portion having the opening is integrally formed on a side portion of the joint fitting. The segment according to claim 5 is the segment according to any one of claims 1 to 4, wherein an anchor bar is connected to the bonding bar, and the bonding bar on the bonding end faces facing each other by the anchor bar is connected. It is characterized by being connected.

According to a sixth aspect of the present invention, there is provided a method for joining segments,
This is a method for joining segments that are joined together with their joining end faces together to form a tunnel wall body, wherein the joining end faces joined to each other in the tunnel circumferential direction face each other and the ends are inward. A joining member formed with a pair of hook-shaped engaging portions each having an engaging piece portion bent to a side, and an engagement member formed on a side portion of the joining member and formed between the engaging portions of the joining member. An opening communicating with the joint space, and the joining fitting has an engaging portion disposed in the engaging space on both sides of a plate-like connecting fitting main body to engage with the locking piece. It is connected by a connection metal fitting, and inserts the engagement part on one side of the connection metal fitting into the engagement space of the bonding metal fitting from the opening of the joint end face of one of the segments to be bonded to each other. The other segment to be joined to the segment Is brought close to one segment while inserting the other engaging portion of the connection fitting into the opening of the joining end face, and the other engaging portion is inserted into the engagement space of the joining fitting. It is characterized by being slid to.

According to the segment joining method of the first aspect or the segment joining method of the sixth aspect,
By inserting one engagement portion of the connection fitting into the engagement space of the connection fitting from the opening formed in the joint end surface of the segment, the connection fitting is held in a state where the other engagement portion protrudes. You. Then, by sliding the other segment in a state where the other engagement portion of the connection fitting is inserted into the opening formed in the joint end face of the other segment, the engagement portions on both sides of the connection fitting are The segments are arranged in the engagement spaces of the joint fittings of the respective segments, and the segments are connected to each other.

According to the second aspect of the present invention, the opening is closed by the opening closing member in a state where the engaging portion on one side of the connecting fitting is inserted into the engaging space of the joining fitting. Accordingly, the connection fitting is held in a state in which movement to the opening side is regulated. According to the third aspect of the present invention, the connection fitting is held by the connection fitting without looseness by the connection fitting holding member provided between the inner surface of the engagement space of the connection fitting and the outer surface of the engaging portion of the connection fitting. In addition, the joining operation between the segments is performed favorably.

Further, according to the segment of the fourth aspect, the connecting fitting can be easily inserted into the engaging space of the joining fitting from the opening of the holding portion provided integrally with the side of the joining fitting. Becomes In addition, since the holding portion having the opening is formed integrally with the joining fitting, the trouble of forming the opening on the joining end face of the segment can be omitted.
According to the segment of the fifth aspect, since the joining metal fittings of the joining end faces facing each other are connected by the anchor streaks, these joining metal fittings are securely fixed to the segment, and the joining metal fitting at the time of manufacturing the segment. Installation is facilitated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A segment and a method of joining segments according to an embodiment of the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1 denotes a segment. These segments 1 are made of concrete formed in a rectangular shape in a plan view, and by joining the joining end surfaces 1a of these segments 1 in the circumferential direction to each other, a ring constituting a tunnel wall body in the excavation hole is formed. It is being built. Then, by joining the rings to each other in the axial direction of the excavation hole, a tunnel wall body is constructed in the excavation hole.

As shown in FIGS. 3 to 6, these segments 1 are attached to circumferentially joined end faces 1 a to be joined to each other.
A plurality of C-shaped joints 2 are provided along the axial direction of the excavation hole, respectively, and these joints 2 are connected to each other by I-shaped joints 3. The joining metal fitting 2 has a pair of hook-shaped locking parts 5 having locking pieces 4 provided at opposing positions, and the space formed by these locking parts 5 is a connecting metal fitting. 3
Space 7 into which the engaging portions 6 formed on both sides of the housing are inserted
It has been.

A connecting fitting 3 for connecting these joining fittings 2
Is formed in an I-shaped cross section, and both side portions of the plate-shaped connecting metal body 8 are the above-mentioned engaging portions 6 to be inserted into the engaging spaces 7 of the connecting metal fittings 2. The connection fitting body 8 is formed to be thinner than the gap between the locking pieces 4 of the locking portion 5 of the bonding fitting 2 and can be inserted.
It is formed thicker than the gap between the locking pieces 4. That is, the engagement portions 6 formed on both sides of the connection fitting 3 are inserted into the engagement spaces 7 of these connection fittings 2, whereby the connection fittings 2 are connected by the connection fitting 3, and the segment 1 Are joined together. In addition, the anchor 2 is provided in the joint 2,
The joint 2 is firmly fixed to the concrete constituting the segment 1 by the anchor bars 9.

On one of the joining end faces 1a ', a joining fitting 2 is provided.
An opening 11 that communicates with the engagement space 7 is formed on the side of the door in the axial direction, that is, on the side joined to the existing ring (upper side in FIG. 1). In these openings 11, FIG.
As shown in FIG. 1, for example, an opening closing member 12 made of an elastic material such as rubber is fitted therein, and the connection fitting 3 inserted into the engagement space 7 of the joining fitting 2 by these opening closing members 12. Of the excavation hole in the axial direction is restricted.

Also, an opening 13 communicating with the engagement space 7 of the joint 2 is formed on the joint end face 1a ″ on the other side, on the side of the excavation hole of each joint 2 in the axial direction. Note that, of the openings 13 formed in the other joint end surface 1a ″, the openings 1 formed between the joint fittings 2 are formed.
3 are formed over the entire area between the joints 2, whereby the joints 2 are connected to each other by the opening 13.

Incidentally, the engagement space 7 of the joint fitting 2 provided on the other joint end face 1a "is formed in a tapered shape which gradually widens toward the rear side in the insertion direction of the engaging portion 6 of the connecting fitting 3. In addition, the connection metal fitting 3 is connected to the other end face 1 of the joint.
a "engagement portion 6 inserted into engagement space 7 of joint fitting 2
However, the engagement surface that engages with the locking piece 4 of the joint fitting 2 is a tapered surface that is gradually inclined inward toward the rear side in the insertion direction into the engagement space 7.

Next, the case where the segments 1 are joined to each other will be described. When joining these segments 1 together, first, as shown in FIG. 8, one of the joining end surfaces 1 of the segments 1 already assembled to the tunnel wall body.
The connecting fitting 3 is held by the joining fitting 2 provided at a '. Here, when the connecting fitting 3 is held by the joining fitting 2, the opening 11 provided on the side of the joining fitting 2 is used.
Then, the engaging portion 6 on one side of the connection fitting 3 is inserted from the front side thereof. Then, the connection metal fitting 3 is moved to the axial face side of the excavation hole, that is, the side where the shield machine for excavating the ground is provided (the lower side in FIG. 1). By doing so, the engaging portion 6 of the connecting fitting 3 is inserted into the engaging space 7 of the joining fitting 2. Then, in this state, the opening closing member 12 is fitted into each opening 11 and closed. In this way, as shown in FIG. 8, the movement of the connection fitting 3 toward the opening 11 is restricted by the opening closing member 12.

After the connecting fittings 3 are held by the joining fittings 2 on one joining end face 1a 'of the segment 1 in this manner, the other joining end face 1a "of the other segment 1 to be joined is attached to the existing one. It is shifted toward the face in the axial direction of the excavation hole so as to approach the joint end face 1a 'on one side of the segment 1. At this time, the opening 13 formed in the joint end face 1a "on the other side of the other segment 1 Fitting 3 held on one end face 1a 'of the existing segment 1
Insert.

Next, the other segment 1 is moved to the axial entrance side of the excavation hole. By doing so, the engaging portion 6 of the connecting fitting 3 is inserted into the engaging space 7 of the joining fitting 2 on the joining end face 1a ″ of the other segment 1. Thereby,
The respective engaging portions 6 of the connecting fittings 3 are arranged in the engaging spaces 7 of the connecting fittings 2 on the joining end surfaces 1 a of the respective segments 1, and the connecting fittings 2 are connected by the connecting fittings 3. 1 are joined end faces 1a
They are joined in a state where they are butted against each other.

Here, at the time of joining, the connecting fitting 3 is pressed toward the cutting face in the axial direction of the excavation hole by the opening closing member 12 provided at the opening 11 of the joining fitting 2,
To the engagement space 7 of the joint fitting 2 on the other joint end face 1a ″ side,
The engaging portion 6 of the connection fitting 3 is pushed in. In addition, as the opening closing member 12, a member having elasticity that pushes the engaging portion 6 of the connecting fitting 3 into the engaging space 7 of the joining fitting 2 with a pressing force equal to or more than the minimum necessary fastening force is used.

As described above, according to the above-described segment-to-segment joining method, the connection fitting 3 is formed through the opening 11 formed in the joining end face 1a 'of the one segment 1.
Is inserted into the engaging space 7 of the joint fitting 2 and the opening closing member 12 is fitted into the opening 11 so that the connecting fitting 3 is connected to the other engaging part 6. Can be held in a protruding state. Then, by sliding the other segment 1 in a state where the other engaging portion 6 of the connection fitting 3 is inserted into the opening 13 formed in the joint end face 1a ″ of the other segment 1, it is extremely easy to slide the other segment 1. The engaging portions 6 on both sides of the connection fitting 3 are connected to the respective segments 1
The segment 1 is arranged in the engagement space 7 of the joint fitting 2 of FIG.
Can be connected to each other.

Thus, as in the prior art, when the joining end surfaces of the segments are cut out and the joining end surfaces of the segments abut against each other, a concave portion is formed on the inner surface side,
Compared to a structure in which the connecting fitting is fitted to the joining fitting from the concave portion, the segments can be extremely easily joined without complicating the joining operation and reducing the joining strength at the joining location.

Also, on one side of the joining end face of the segment,
There is no projecting portion from the joint end face as compared with the case where the joint fitting having the engaging portion is embedded and protruded, and the projecting joint fitting is engaged with the joint fitting on the other joint end face of the segment. This makes it possible to simplify the mold for forming the segment, thereby facilitating the manufacture of the segment-forming mold. Moreover, since the play can be obtained at the connecting portion of the connecting fitting with the joining fitting, the work of inserting the connecting fitting can be easily performed.

Further, the joining metal fitting 2 on the one joining end face 1a '
Is held down by the elastic force of the opening closing member 12, and the engaging portion 6 is inserted into the engaging space 7 of the joining fitting 2 on the other joining end face 1a ″. Therefore, it is possible to absorb a variation in the engagement position of the connection fitting 3 with the connection fitting 2 which is derived from the precision of the connection fitting 2 formed by casting or the like, and to always provide the connection fitting with a substantially constant locking force. 3 can be locked to the joint fitting 2.

Further, as compared with a structure in which the joining end faces are butted together and the connecting fittings are inserted into the joining fittings and joined, the operation of inserting the connecting fittings at the time of joining becomes unnecessary, and the segment assembling time is reduced. In addition, it is possible to eliminate the need for a robot or the like for inserting the connection fitting, thereby achieving a significant reduction in cost. Further, the engagement space 7 of the joint fitting 2 provided on the other joint end face 1a ″ is formed in a tapered shape that gradually widens toward the rear side in the insertion direction of the engaging portion 6 of the connecting fitting 3, so that the joining fitting is formed. Engaging portion 6 of connecting fitting 3 to engaging space 7
Can be easily inserted, and the joining workability can be further improved.

After the segments 1 are joined together, the joint between the joining fittings 2 by the connecting fittings 3 may be filled with mortar or the like as a filler. In other words, by filling the mortar into the joints in this way, the joining state of the joints 2 by the joints 3 can be reliably maintained, and the water stopping effect at the joints can be obtained. Thereby, the connecting fitting 3 and the joining fitting 2
Etc. can be prevented. Segment 1
The other joint end face 1a ″ is connected to each joint by an opening 13 communicating between the joint fittings 2, so that the mortar can be filled into the joint from one place.

The shape of the segment 1 is not limited to the above. 9 and 10 show the segment 1 in which the joint end face 1a is inclined with respect to the borehole axial direction and further inclined with respect to the borehole radial direction. Also, when joining the segments 1 having such an inclined end surface 1a to each other, first, as shown in FIG. 11, the segments 1 attached to the existing tunnel wall are used.
The engaging portion 6 of the connection fitting 3 is inserted into the opening 11 of the connection fitting 2 on one of the joining end surfaces 1a ', and the connection fitting 3 is moved toward the cutting face in the axial direction of the excavation hole to engage the connection fitting 2. Joint space 7
And the opening closing member 12 is fitted into the opening 11, and in this state, the other segments 1 to be joined are joined.
From the position shifted toward the face in the axial direction of the drilling hole, the engaging portion 6 of the connection fitting 3 may be moved toward the opening in the axial direction of the drilling hole while inserting the engaging portion 6 of the fitting 3 into the engaging space 7 of the fitting 2. .

The number of the metal fittings 2 provided on the bonding end face 1a of the segment 1 is not limited to the above example, but may be any number according to the application. As shown in FIG. 12, the mutually opposing joint metal fittings 2 provided on the respective joint end faces 1 a are connected to the anchor bars 9.
By making the connection, the installation of the joint fitting 2 at the time of manufacturing the segment 1 can be facilitated, whereby the manufacturing cost of the segment 1 can be reduced.

In the above example, the opening closing member 12 having elasticity is fitted into the opening 11, and the engaging portion 6 of the connecting fitting 3 is moved by the elastic force of the opening closing member 12. Although the insertion portion 7 is inserted into the engagement space 7, as the opening closing member 12, for example, when the engagement portion 6 of the connection fitting 3 is inserted into the engagement space 7 of the joining fitting 2, the insertion force is minimum. A plastically deformable material such as a foamed resin, which buckles when the fastening force is reached, may be used.

FIG. 13 shows a segment 1 provided with a joining fitting 2 of another structure.
A holding part 21 having an opening 11 into which the connecting fitting 3 can be inserted is formed on a side of the joining fitting 2 provided on the joining end face 1a. An engaging portion 22 is formed at an end of the holding portion 21 of the joining fitting 2, and the opening portion 1 is formed by the engaging portion 22 as shown in FIG.
The opening closing member 12 fitted into the opening 1 is locked on the opening side in the axial direction of the excavation hole to hold the opening closing member 12. According to the segment 1 having the joint 2 of this structure, the connecting fixture can be easily inserted into the engagement space 7 of the joint 2 from the opening 11 of the holding portion 21 provided integrally with the side of the joint 2. 3 can be inserted.
Further, the holding portion 21 having the opening 11 is
Since it is formed integrally, the trouble of forming the opening 11 on the joint end surface 1a of the segment 1 can be omitted, and the manufacturing cost of the segment 1 can be reduced.

FIG. 15 shows a configuration in which a connecting member holding member 23 made of sponge or the like is provided between the inner surface of the engaging space 7 of the connecting member 2 and the outer surface of the engaging portion 6 of the connecting member 3. When one of the engagement portions 6 is inserted into the engagement space 7 of the joint 2, the joint 3 is held by the joint 2 by the joint holding member 23 without looseness, and the other segment 1 is joined. It can be performed well. The connecting member holding member 23 may be provided on either the inner surface of the engaging space 7 of the connecting member 2 or the outer surface of the engaging portion 6 of the connecting member 3.

FIG. 16 shows one of the joint end surfaces 1.
The opening 11 formed in the hole a ′ is provided on the cutting face in the axial direction of the drilling hole of the joint fitting 2. Therefore, the connecting fitting 3 is inserted from the opening 11 to be opposed to the drilling hole axial direction. By moving to the mouth side, one engagement portion 6 is inserted into the engagement space 7 of the joint fitting 2. In this structure, the engagement space 7 of the joint 2 provided on one joint end surface 1a 'and the joint 2
One of the engagement portions 6 of the connection fitting 3 that engages with each other is formed in a tapered shape that gradually narrows forward in the insertion direction of the connection fitting 3. Therefore, when one of the engaging portions 6 of the connecting fitting 3 is inserted into the engaging space 7 of the joining fitting 2, the connecting fittings 3 are engaged with each other in a state where the connecting fittings 3 are inserted to some extent, and the insertion of the connecting fittings 3 is performed. The movement in the direction, that is, in the axial direction of the excavation hole, is restricted. In this case, since the movement of the connection fitting 3 is regulated, the opening 11 may be simply buried with concrete or the like as the opening closing member 12 and closed with this concrete.

In the above-mentioned example, the connecting bracket 3 is held on the existing segment 1 constituting the tunnel wall, and one of the joining end faces 1a 'of the segment 1 holding the connecting bracket 3 is attached to the other segment. The other joining end face 1a "of the first segment 1 is joined. Conversely, the other joining end face 1a" of the other segment 1 holds the connecting fitting 3 in advance, and the connecting fitting 3 is held. The other segment 1
Of course, the other joining end face 1a "may be joined to one joining end face 1a 'of the existing segment 1 assembled to the tunnel wall.

[0040]

As described above, according to the segment and the method of joining segments according to the present invention, the following effects can be obtained. According to the segment joining method of the first aspect and the segment joining method of the sixth aspect, one of the engaging portions of the connecting fitting is inserted into the engaging space of the joining fitting from the opening formed in the joining end face of the segment. Thereby, the connection fitting can be held in a state where the other engagement portion is projected. Then, by sliding the other segment in a state where the other engagement portion of the connection fitting is inserted into the opening formed in the joint end surface of the other segment,
It is very easy to arrange the engaging portions on both sides of the connecting fitting in the engaging spaces of the joining fittings of the respective segments to connect the segments. As a result, a concave portion is formed on the inner surface side when the joining end surfaces of the segments are cut out and the joining end surfaces of the segments are abutted, as in the conventional case, and the coupling fitting is fitted into the joining fitting from the recess. As compared with the structure, the segments can be extremely easily joined without causing a complicated joining operation and a decrease in joining strength at a joining portion.

Further, on one end face of the segment,
There is no projecting portion from the joint end face as compared with the case where the joint fitting having the engaging portion is embedded and protruded, and the projecting joint fitting is engaged with the joint fitting on the other joint end face of the segment. This makes it possible to simplify the mold for forming the segment, thereby facilitating the manufacture of the segment-forming mold. Moreover, since the play can be obtained at the connecting portion of the connecting fitting with the joining fitting, the work of inserting the connecting fitting can be easily performed. Further, compared with a structure in which the joining end faces are butted together, the joining fittings are inserted into the joining fittings and joined, the work of inserting the joining fittings at the time of joining becomes unnecessary, and the segment assembling time can be reduced. In addition, a robot or the like for inserting the connection fitting can be eliminated, and the cost can be significantly reduced.

According to the second aspect of the present invention, the opening is closed by the opening closing member in a state where the engaging portion on one side of the connecting fitting is inserted into the engaging space of the joining fitting. The connection fitting can be held in a state where movement to the opening side is regulated. According to the third aspect of the invention, the connection fitting is held by the connection fitting without looseness by the connection fitting holding member provided between the inner surface of the engagement space of the connection fitting and the outer surface of the engagement portion of the connection fitting. Therefore, the joining operation between the segments can be performed favorably.

According to the fourth aspect of the present invention, the connecting fitting can be easily inserted into the engaging space of the joining fitting from the opening of the holding portion provided integrally with the side of the joining fitting. In addition, since the holding portion having the opening is formed integrally with the joint, the trouble of forming the opening at the joint end face of the segment can be omitted, and the manufacturing cost of the segment can be reduced. Claim 5
According to the described segment, the joining metal fittings of the joining end faces facing each other are connected to each other by the anchor streaks, so that these joining metal fittings can be reliably fixed to the segment, and the setting of the joining metal fittings during the production of the segment Can be facilitated, whereby the cost of manufacturing the segments can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a joining portion between segments for describing a segment and a joining method of the segment according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a joining portion between segments for explaining a segment and a joining method of the segment according to the embodiment of the present invention.

FIG. 3 is a perspective view of a joining end face on one side of the segment for explaining a segment and a method for joining the segments according to the embodiment of the present invention.

FIG. 4 is a front view of a joining end face on one side of the segment for explaining a segment and a method for joining the segments according to the embodiment of the present invention.

FIG. 5 is a perspective view of a joining end face on the other side of the segment for explaining a segment and a method for joining the segments according to the embodiment of the present invention.

FIG. 6 is a front view of a joining end face on the other side of the segment for explaining a segment and a method for joining the segments according to the embodiment of the present invention.

FIG. 7 is a front view of a part of a joining end face on one side of the segment for explaining a segment and a method for joining the segments according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view of a joining portion between segments for explaining a joining procedure between segments according to the embodiment of the present invention.

FIG. 9 is a cross-sectional view of a joint between segments for explaining a segment and a method for joining the segments according to another embodiment of the present invention.

FIG. 10 is a longitudinal sectional view of a joint between segments for explaining a segment and a method for joining the segments according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view of a joining portion between segments for describing a joining procedure between segments according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view of a segment showing another example of the segment according to the embodiment of the present invention.

FIG. 13 is a front view of a joint end face of the segment for explaining another example of the joint fitting provided on the segment according to the embodiment of the present invention.

FIG. 14 is a front view of a joint end face of a segment for explaining another example of the joint fitting provided on the segment according to the embodiment of the present invention.

FIG. 15 is a vertical cross-sectional view of a joining fitting holding a connecting fitting in one segment for explaining another example of the segment and the joining method of the segment according to the embodiment of the present invention.

FIG. 16 is a cross-sectional view of a joint between segments for explaining a segment and a method for joining the segments according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 segment 1a, 1a ', 1a "Joining end surface 2 Joining fitting 3 Connecting fitting 4 Locking piece 5 Locking part 6 Engaging part 7 Engaging space 8 Connection fitting main body 9 Anchor bar 11, 13 Opening 12 Closure of opening Member 21 Holder 23 Holder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirohide Hashimoto 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawajima Building Materials Industry Co., Ltd. (72) Inventor Kazuhiro Kobayashi 1-12-1 Yurakucho, Chiyoda-ku, Tokyo No.Ishi Kawashima Building Materials Co., Ltd.

Claims (6)

[Claims] 1. Segments which are joined together with their joining end surfaces together to form a tunnel wall, and which are joined to each other in the circumferential direction of the tunnel, are opposed to each other and have ends. A joint having a pair of hook-shaped engaging portions having inwardly bent engaging pieces; and a joint formed between the engaging portions of the joint formed on side portions of the joint. An opening communicating with the engaging space, wherein the joining fitting is arranged in the engaging space on both sides of a plate-like connecting fitting main body and engages with the locking piece. The joining fitting is held by inserting the engaging portion on one side of the joining fitting from the opening into the engaging space of the joining fitting. The segment to feature. 2. An opening closing member for closing the opening is fitted into the opening.
The described segment. 3. A holding member for holding a connection fitting having an engagement portion on one side inserted into the engagement space of the joint fitting between an inner surface of the engagement space and an outer surface of the engagement portion. The segment according to claim 1, wherein the segment is provided. 4. The segment according to claim 1, wherein a holding portion having the opening is integrally formed on a side portion of the joining fitting. 5. The joint according to claim 1, wherein anchors are connected to the joints, and the joints at the joint end faces facing each other are connected by the anchors. The segment according to item 1. 6. A method for joining segments which are joined together with their joining end faces together to form a tunnel wall body, wherein the joining end faces joined to each other in the tunnel circumferential direction face each other and Between a joint having a pair of hook-shaped engaging portions each having an engaging piece portion whose end is bent inward, and between the engaging portions of the joining metal formed on side portions of the joining metal. And an opening communicating with the engaging space formed in the main body. The joint is disposed in the engaging space on both sides of a plate-like connecting metal main body and engages with the locking piece. The connecting part is connected by a connecting part having an engaging part, and the engaging part on one side of the connecting part is inserted into the engaging space of the connecting part from the opening of the connecting end face of one of the segments to be connected to each other. , Then join to one segment The other segment is brought close to one segment while inserting the other engaging portion of the connection fitting into the opening of the joining end face, and the other engaging portion is inserted into the engagement space of the joining fitting. A method for joining segments, wherein the segments are slid so as to be inserted.