JP3272670B2 - Segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure of segments that form a cylindrical wall in an axial direction of a drilled hole by connecting a plurality of segments to each other.

[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. It is possible to join the segments without bias in the circumferential direction, but in this case, an I-shaped fitting for joining the C-shaped fitting on the back side, a holding fitting for holding the joining face in advance is necessary, and the like. This leads to increased costs. In addition, it is necessary to hold the I-shaped fitting on the holding fitting before the segments are joined to each other, which complicates the operation and may cause the I-shaped fitting to fall off from the holding fitting at the time of joining the segments. And in this case, in particular,
There is a possibility that the I-shaped metal fitting on the side of the door shifts rearward in the fitting direction, so that a reliable joining force cannot be obtained.

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 cutting face side. 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.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can be joined without unevenness or looseness at a plurality of locations in the axial direction without lowering the strength of the segments. It is an object of the present invention to provide a joining structure of segments that does not need to perform a work of closing a concave portion.

[0010]

In order to achieve the above object, a segment joining structure according to the first aspect of the present invention is joined to a tunnel wall body in a drilled hole with the joining surfaces of the segments facing each other. In the joining structure of the segments constituting, a joining groove portion is formed along the axial direction of the excavation hole on a joining surface joined to each other, and a plurality of joining fittings are provided at intervals in the joining groove portion. The joining metal fittings are connected to each other by a connecting metal fitting, and the joining metal fittings are provided so as to face each other, and have a pair of hook-shaped locking portions each having an inwardly bent locking piece. a, the connecting fittings, on both sides of the plate-shaped connecting fitting body, the locking portion engaging for engagement with the engaging piece fitted in the formed engagement space between the adjacent An engaging portion having a surface is provided, and the joining surfaces of the segments project from each other. By fitting, by sequentially inserting the connecting metal fittings from one side into the insertion holes formed by the connecting groove portions, the engaging portions of the connecting metal fittings are sequentially arranged in the engaging space from the rearmost connecting metal fitting. is arranged, the joint device together is coupled, the connecting gold
The engaging surface of the engaging portion of the tool is directed rearward in the insertion direction into the insertion hole.
And the taper surface gradually approaches to
In the stop piece portion, the locking surface that engages with the engaging surface is the same as the engaging surface.
The connecting fittings, which are tapered surfaces inclined in the same direction and connect the joining fittings on the back side to each other, have a minimum distance between their engaging portions.
The gap is the maximum distance between the inner surfaces of the locking pieces of the joining metal fitting on the near side.
It is characterized in that the engagement portion is made larger than the gap so as to be able to pass through the engagement space of the front joint fitting.

[0011]

According to a second aspect of the present invention,
2. The segment joining structure according to claim 1 , wherein a plurality of joining grooves are formed on a joining surface of the segments at intervals in a thickness direction, and a plurality of joining grooves are formed at intervals in the longitudinal direction. The invention is characterized in that the joining fittings are provided, and the joining fittings are connected to each other by the connecting fittings. According to a third aspect of the present invention, in the segment joining structure according to the first or second aspect , the joining fitting has a thickness of the locking portion that is rearward in a direction of insertion of the connecting fitting. It is characterized by being gradually thickened.

According to a fourth aspect of the present invention,
The segment joining structure according to any one of claims 1 to 3 , wherein the joining fitting has a plurality of ribs formed on an outer surface of the locking portion in a direction intersecting an insertion direction of the connecting fitting. It is characterized by: The joining structure of a segment according to claim 5 is the joining structure of the segment according to any one of claims 1 to 4 , wherein the segment is formed of concrete, and the joining fitting is formed of concrete forming the segment. It is characterized in that a plurality of embedded anchor bars are connected. Claim
The joint structure of the segment according to claim 6 is the joint structure of the segment according to claim 5 , wherein a support plate is integrally formed on an end of the anchor bar on a surface substantially orthogonal to an axis of the anchor bar. It is characterized by.

According to a seventh aspect of the present invention,
The joining structure for a segment according to any one of claims 1 to 6 , wherein a spacer is provided in the insertion hole formed by the joining groove, between the connecting fittings, and rearward in the insertion direction of the last fitting fitting. Is fitted. Joint structure segment according to claim 8, wherein
Item 8. In the joint structure for a segment according to any one of Items 1 to 7 , an injection hole communicating with the joint groove portion is formed on an inner surface of the segment, and the joint hole is connected to the joint hole by the joint metal. Thus, a filler is injected into the insertion hole formed by the joining groove.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a structure for joining segments according to an embodiment of the present invention. 1 to 5, reference numeral 1 denotes a segment. The segments 1 are made of concrete formed in a rectangular shape in a plan view, and the joining surfaces 1a of these segments 1 in the circumferential direction.
Are joined to each other so that a ring constituting a cylindrical wall body is formed in the excavation hole. Then, by joining the rings to each other in the axial direction of the excavation hole, a cylindrical wall body is constructed. In these segments 1, two rows of joining grooves 2 are formed in the joining surface 1 a in the circumferential direction in the thickness direction of the segments 1.

A plurality of C-shaped fittings 3 are provided in each of the joining grooves 2 along the axial direction of the excavation hole, and these joining fittings 3 are connected to each other by I-shaped connecting fittings 4. Have been. As shown in FIGS. 6 to 8, the joining fitting 3 is provided with a pair of hook-shaped locking portions 6 having locking pieces 5 provided at opposing positions. The space formed by the 6 is an engagement space 8 with which the engagement portion 7 of the connection fitting 4 engages. The locking surface 9 formed by the inner surface of the locking piece 5 is a tapered surface that narrows in the insertion direction A of the connection fitting 4. That is, in a state where the joining surfaces 1a of the segments 1 abut against each other, the engaging surfaces 9 of the joining fittings 3 facing each other.
Are tapered surfaces that gradually approach rearward in the insertion direction of the connection fitting 4. The joint metal member 3 is formed with a female thread 10 for connecting an anchor bar made of a millimeter screw, and an anchor bar 11 is screwed and connected to the female thread 10 for connecting an anchor bar. A support plate 12 that is substantially perpendicular to the axis of the anchor bar 11 is integrally formed at the end of the anchor bar 11.

Further, in the joint 3, the side wall 6 a constituting the locking portion 6 is gradually thicker toward the rear side in the insertion direction of the connecting member 4.
A plurality of ribs 13 are formed at the connection position with the first bracket 1 in a direction intersecting the insertion direction A of the connection fitting 4.

A connecting fitting 4 for connecting these joining fittings 3
As shown also in FIG. 9, is formed in an I-shaped cross section, and the both sides of the connection fitting main body 21 are fitted into the engagement spaces 8 of the joining fitting 3 as described above. It has been.
The connecting metal body 21 is formed thinner than the gap between the locking pieces 5 of the locking parts 6 of the bonding metal 3 and can be inserted therethrough. Is formed thicker than the gap. Further, the engaging surface 22 formed on the engaging portion 7 of the connecting fitting 4 which comes into contact with and engages with the locking surface 9 of the locking piece 5 of the joining fitting 3 is in contact with the engaging surface 9 of the joining fitting 3. Similarly, it is a tapered surface approaching rearward in the insertion direction.

In this case, the joining metal fitting 3 is formed such that the pit side of the digging hole in the joining groove 2, that is, the joining side to the existing ring is the pit side joining metal fitting 3 A, and the face of the digging hole, that is, The side on which the shield machine for excavating the ground is provided is a face-face-side joint fitting 3B. On the contrary,
The connection metal fittings 4 that connect the entrance-side joining metal fittings 3A to each other are referred to as an entrance-side joining metal fitting 4A, and
What connects B to each other is a face-side connecting metal fitting 4B. Then, in a state where the joining surfaces 2 of the segments 1 abut against each other, when the mouth opening side connection fitting 4A is inserted into the insertion hole 23 formed from the joining groove portion 2 of each other, when the mouth opening side connection fitting 4A is inserted. The engaging portion 7 passes through the engaging space 8 of the face-shaped connecting metal fitting 3B and engages with the rear-end connecting metal fitting 3A. In other words, the entrance-side connection fitting 4A
The minimum distance L1 between the engaging portions 7 is larger than the maximum distance L2 between the inner surfaces of the locking pieces 5 of the face-side joining metal fitting 3B in a state where the joining surfaces 1a of the segments 1 abut each other. Maximum width dimension L3 of the entrance-side connecting bracket 4A
Is smaller than the interval L4 between the bottoms forming the engagement space 8 of the face-side joining metal fitting 3B in a state where the joining surfaces 1a of the segments 1 abut against each other (see FIG. 3). In addition, the joining metal fitting 3 and the connecting metal fitting 4 are both rounded at their corners so that stress concentration does not occur.

Next, the case where the segments 1 are joined to each other will be described with reference to FIGS. To join segments 1, first,
Are brought into contact with each other in the circumferential direction. In this manner, the joining grooves 2 formed on the joining surfaces 1a of the respective segments 1 abut each other to form the insertion holes 23. In this state, first, the entrance-side connecting metal fitting 4A is inserted from the insertion hole 23 and pushed in.

In this way, the door-side connecting fitting 4
A first passes between the face-side joining metal fittings 3B, and is further pushed in, so that the opening-side connecting metal fitting 4A reaches the opening-side joining metal fitting 3A and is fitted to the opening-side joining metal fitting 3A. Is done. That is, the engaging portion 7 of the mouthpiece-side connecting metal fitting 4A is fitted in the engagement space 8 of the mouthpiece-side connecting metal fitting 3A, and the respective mouthpiece-side connecting metal fittings 3A are mutually connected by the mouthpiece-side connecting metalwork 4A. They are connected (see FIG. 10). Here, the engaging surface 22 formed of the tapered surface of the engaging portion 7 of the opening-side connecting metal fitting 4A comes into contact with the locking surface 9 formed of the tapered surface of the locking piece 5 of the opening-side connecting metal fitting 3A. By sliding, the respective mouth-side joining metal fittings 3A are attracted to each other.

Next, a spacer 24 made of resin or the like is inserted into the insertion hole 23 (see FIG. 11). After that, the cutting-face-side connecting metal fitting 4B is inserted into the insertion hole 23 and pushed. In this manner, the face-side connecting metal fitting 4B is fitted to the face-side connecting metal fitting 3B. That is, the engaging portions 7 of the face-side connecting metal fittings 4B are fitted into the engaging spaces 8 of the face-side connecting metal fittings 3B, and the respective face-side connecting metal fittings 3B are mutually connected by the face-side connecting metal fitting 4B. Connected (Fig. 1
2). Also in this case, the engaging surface 22 formed of the tapered surface of the engaging portion 7 of the face-side connecting metal fitting 4B has the face-side connecting metal fitting 3.
By sliding in contact with the locking surface 9 of the locking piece portion 5 of B, which is a tapered surface, the respective cutting-face-side joining metal fittings 3B are drawn to each other. Further, the insertion hole 23
A spacer 25 formed of a resin or the like is fitted into each of the segments to complete the joining of the segments 1 (see FIG. 13).

As described above, according to the segment joining structure of the above embodiment, the joining surfaces 1a of the segments 1 abut against each other, thereby connecting to the insertion hole 23 formed from the joining grooves 2 on the back opening side. The metal fittings 4A and the face-side connecting metal fittings 4B are inserted in this order, and the entrance-side joining metal fittings 3A are respectively provided.
The segments 1 can be extremely easily joined at a plurality of locations in the width direction without bias by connecting the face-to-face and face-face joining fittings 3B to each other.

[0024] Further, since the flank side connection fitting 4A is made to pass through the cutting face side bonding metal 4B, the flank side connection metal fitting 4B is provided.
A and the face-side connecting fitting 4B can be inserted from the end face side on the face side, respectively, and fitted to the front-side joining fitting 3A and the face-side joining fitting 3B, respectively. As a result, as in the prior art, the I-shaped metal fitting on the back end is held on the joint surface of the segment, or the joint surface of the segment is cut off from the inner surface side and the joint surface of the segment is brought into contact with the inner surface. In comparison with a structure in which a concave portion is formed in the concave portion and the connecting metal fitting is fitted to the connecting metal member from the concave portion, the segments can be extremely easily formed without complicating the joining operation and lowering the joining strength at the joint portion. And from one direction. Further, since two rows of joining grooves 2 are formed in the thickness direction of the segments 1 and the joining fittings 3 are connected to each other by the joining fittings 4 in these joining grooves 2, the joining strength between the segments 1 is greatly increased. Can be improved.

Further, the thickness of the engaging portion 6 of the joining metal member 3 is gradually increased toward the rear side in the insertion direction of the connecting metal member 4, so that the engaging portion 22 of the connecting metal member 4 engages with the engaging surface 22 of the engaging part 7. The locking surface 9 is a tapered surface, so that the strength of the locking piece 5 is slightly lower than the front side of the connecting fitting 4 in the insertion direction, so that the strength of the rear side in the insertion direction can be increased. In addition, since the plurality of ribs 13 are formed on the outer surface of the locking portion 6 of the joint 3, the strength of the locking portion 6 can be further improved. Also,
By the plurality of anchor bars 11 connected to the joint 3, the joint 3 can be reliably fixed to the concrete constituting the segment 1. Moreover, since the support plate 12 is provided at the end of the anchor bar 11, the segment 1
The fixing power with the concrete which constitutes can be greatly increased. In this case, the concrete is designed so that the bearing strength and shear strength of the concrete and the strength of the anchor bar 11 can be balanced. In addition, as the anchor bar 11, a generally used anchor bar 11 having no supporting plate 12 at the end may be used as long as the anchor bar 11 can obtain a sufficient fixing force with the concrete constituting the segment 1. Of course.

Further, since the spacers 24 and 25 are fitted between the opening-side connection fitting 4A and the face-side connection fitting 4B and on the rear side of the face-side connection fitting 4B, these opening-side connection fittings 4A, The movement of the face-side connecting fitting 4B to the rear side in the insertion direction is prohibited by the spacers 24 and 25, and the front-side connecting fitting 3A, the front-side connecting fitting 4A from the face-side connecting fitting 3B, and the face-side connecting fitting. 4B can be reliably prevented from loosening.

14 and 15, the injection hole 26 communicating from the inner surface side of the segment 1 to the joining groove 2 forming the insertion hole 23 is formed, and the opening-side connection metal fitting 4A and the face-side connection are formed. After fitting the metal fittings 4B to the mouth-side joining metal fittings 3A and the face-side joining metal fittings 3B, and fitting the spacers 24 and 25 between them and into the opening side of the insertion hole 23, the mortar is inserted through the injection hole 26. (Filler) 27
May be injected and filled in the insertion hole 23. By filling the insertion hole 23 with the mortar 27 in this way, the joining state of the joining fittings 3 by the connecting fittings 4 can be reliably maintained, and the joining groove 2 can be maintained.
It is possible to obtain a water stopping effect in the inside, and thereby it is possible to prevent corrosion of the connecting fitting 4 and the joining fitting 3 and the like.

In the above example, the engaging surface 22 of the engaging portion 7 of the connecting member 4 is a tapered surface that gradually approaches rearward in the insertion direction into the insertion hole 23, and The engaging surface 9 engaging with the engaging surface 22 of the portion 5 is formed as a tapered surface inclined in the same direction as the engaging surface 22, and the joining fittings 3 are attracted to each other by the insertion force of the connecting fitting 4, so that the segment 1
Although they were joined together in a state where they were attracted to each other, for example,
At a joining portion where the joining surfaces 1a in the circumferential direction are closely contacted by the earth pressure, such as a tunnel wall to which internal pressure is not applied, when the segments 1 are joined to each other, these segments 1
Since there is no need to attract the joining surfaces 1a of each other, the connecting fittings 4 and the joining fittings 3 are straight members in which the respective engaging surfaces 22 and the locking surfaces 9 are not tapered. What is necessary is just to install so that the engagement part 7 may be arrange | positioned in the engagement space 8 of the joint fitting 3. FIG.

[0029]

As described above, according to the segment joining structure of the present invention, the following effects can be obtained. According to the segment joining structure of the first aspect, by joining the joining surfaces of the segments to each other, a plurality of connecting fittings are sequentially inserted into the insertion holes formed from the joining groove portions, and the connection of each joining fitting is performed. by fitting the engagement portion of the coupling fitting to the case space, very easily,
The segments can be joined without bias at a plurality of locations in the width direction. In addition, since the back side connection metal is made to pass through the front side connection metal, the back side connection metal and the front side connection metal are inserted in order, respectively, and between the respective connection metal.
Can be fitted . As a result, as before,
An I-shaped metal fitting on the mouth side is held on the joint surface of the segment, or a concave portion is formed on the inner surface side when the joint surface of the segment is cut out by cutting out the joint surface portion of the segment. As compared with a structure in which the connecting fitting is fitted to the joining fitting from above, the segments can be joined very easily without complicating the joining operation and lowering the joining strength at the joining portion. In addition, the engagement surface of the engagement portion of the connection fitting is a tapered surface that gradually approaches rearward in the insertion direction into the insertion hole, and the engagement surface that engages with the engagement surface of the engagement piece of the joint fitting. Is a tapered surface inclined in the same direction as the engaging surface, so that when the connecting member is inserted and the engaging portion of the connecting member is arranged in the engaging space of the joining member, the engagement of the connecting member is reduced. The engagement surface of the joining portion and the locking surface of the joint are in contact with each other, and the joints are attracted to each other by the insertion force of the joint, so that the segments can be surely joined.

According to the segment joining structure of the second aspect , a plurality of rows of joining grooves are formed in the thickness direction of the segments, and the joining fittings are connected by the joining fittings at the joining grooves, so that the joining fittings are connected to each other. The joining strength between the segments can be greatly improved. According to the segment joining structure of the third aspect, the thickness of the engaging portion of the joining metal is gradually increased toward the rear side in the insertion direction of the connecting metal. The engaging surface is a tapered surface, so that the strength of the locking piece portion is slightly lower than the front side in the insertion direction of the connection fitting, so that the strength on the rear side in the insertion direction can be increased. According to the segment joining structure of the fourth aspect , since the plurality of ribs are formed on the outer surface of the engaging portion of the joining fitting, the strength of the engaging portion can be improved. According to the joint structure of the segment according to claim 5 ,
By the plurality of anchor bars connected to the joint, the joint can be reliably fixed to the concrete constituting the segment.

The claimed according to the joining structure of the segments of claim 6, it is possible to further improve the fixing strength of the concrete by Bearing plate integrally formed on the end portion of the anchor muscle. According to the joint structure of the segment according to claim 7 ,
Since the spacers were fitted between the connection fittings and on the rear side in the insertion direction of the connection fittings fitted last, the movement of the connection fittings rearward in the insertion direction is prohibited by the spacers, and the connection fittings from the connection fittings are prohibited. Looseness can be reliably prevented. According to the joint structure of the segment according to claim 8 ,
Since the filler is injected into the joint groove from the injection hole after the joint is joined by the joint, the joining state of the joints by the joint can be reliably maintained, and a water stopping effect in the joint groove is provided. Can be obtained, and corrosion of the connecting fitting, the joining fitting, and the like can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a joint between segments for describing a joint structure of segments according to an embodiment of the present invention.

FIG. 2 is a perspective view of a joint between segments for explaining a joint structure of the segment according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view of a joint between segments for explaining a joint structure of the segment according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a joint between segments for explaining a joint structure of segments according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view of a part of a joint portion between segments for explaining a joint structure of the segment according to the embodiment of the present invention.

FIG. 6 is a plan view of the joint for explaining the configuration and shape of the joint used in the segment joint structure according to the embodiment of the present invention;

FIG. 7 is a side view of the joint for explaining the configuration and shape of the joint used for the joint structure of the segments according to the embodiment of the present invention.

FIG. 8 is a rear view of the joint for explaining the configuration and shape of the joint used for the segment joint structure according to the embodiment of the present invention;

FIG. 9 is a perspective view of the connection fitting for describing the configuration and shape of the connection fitting used in the segment joining structure according to the embodiment of the present invention.

FIG. 10 is a cross-sectional view of a joining portion between the segments for explaining a joining procedure between the segments by the joining structure of the segments according to the embodiment of the present invention.

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

FIG. 12 is a cross-sectional view of a joint portion between segments for explaining a joining procedure between segments by the segment joint structure according to the embodiment of the present invention.

FIG. 13 is a cross-sectional view of a joining portion between the segments for explaining a joining procedure between the segments by the joining structure of the segments according to the embodiment of the present invention.

FIG. 14 is a vertical cross-sectional view of a joint between segments for explaining an example of a case in which mortar is injected into a joint between segments joined by the joint structure of segments according to an embodiment of the present invention.

FIG. 15 is a plan view of a joint between segments for explaining an example of a case where mortar is injected into a joint between segments joined by the joint structure of segments according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Segment 1a Joining surface 2 Joining groove part 3 Joining fitting 4 Connecting fitting 5 Locking piece 6 Locking part 7 Engaging part 8 Engaging space 9 Locking surface 11 Anchor bar 12 Support plate 13 Rib 22 Engaging surface 23 Insertion hole 24, 25 Spacer 26 Injection hole 27 Mortar (filler)

Continued on the front page (73) Patent holder 000201478 Maeda Construction Industry Co., Ltd. 2-10-26, Fujimi, Chiyoda-ku, Tokyo (73) Patent holder 000001052 Kubota Co., Ltd. 47 (72) Inventor Makoto Kanai 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Hiroshi Watanabe 2-7-1 Nishishinjuku, Shinjuku-ku, Tokyo Pacific Consultants Co., Ltd. (72) Inventor Hirohide Hashimoto 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Ishikawajima Building Materials Industry Co., Ltd. (56) References JP-A-7-269297 (JP, A) JP-A-63-118497 (JP, A) JP-A-7-71195 (JP, A) JP-A-7-35596 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (8)

(57) [Claims] 1. A joining structure of segments forming a tunnel wall body which are joined in a digging hole with their joining surfaces abutting each other, wherein the joining surfaces to be joined to each other include the digging hole A joining groove is formed along the axial direction of the joining groove, a plurality of joining fittings are provided at intervals in the joining groove, and these joining fittings are connected to each other by connecting fittings, and the joining fittings face each other. A pair of hook-shaped locking portions each of which is provided with a locking piece portion whose end is bent inward, wherein the connecting metal fittings are provided on both sides of a plate-like connecting metal fitting body,
An engagement portion having an engagement surface that is fitted into an engagement space formed between the engagement portions and engages with the engagement piece portion; By abutting each other, in the insertion hole formed by the joining groove portions,
By inserting the connecting fittings sequentially from one side, the engaging portions of the connecting fittings are arranged in the engagement space in order from the rear joining fitting, and the joining fittings are connected to each other, and the connection is performed. The engaging surface of the engaging part of the bracket is inserted in the insertion hole
The taper surface is gradually approaching backward,
The locking piece of the alloy tool has a locking surface that engages with the engagement surface.
Is a serial engaging surface and inclined tapered surface in the same direction, connecting fitting for connecting the connecting bracket on the rear side to each other, the engagement
The minimum distance between the joints is
The joining structure of segments, wherein the engaging portion is made larger than the maximum distance between the inner surfaces so that the engaging portion can pass through the engaging space of the joining metal fitting on the near side. 2. The method according to claim 1, further comprising :
A plurality of joint grooves are formed at intervals, and these joint grooves are formed.
The part has a plurality of the above-mentioned contacts at intervals in the longitudinal direction.
An alloy fitting is provided, and these joining fittings are connected to each other by the connecting metal.
The joint structure for segments according to claim 1, wherein the segments are connected by a tool . 3. The joining fitting according to claim 1 , wherein the locking portion has a front wall thickness.
The connecting bracket is gradually thicker toward the rear in the insertion direction.
The joint structure for a segment according to claim 1 or 2 , wherein: 4. The joining metal fitting is provided on an outer surface of the locking part.
A plurality of ribs extend in a direction intersecting with the insertion direction of the connection fitting.
4. The method as claimed in claim 1, wherein the second member is formed.
The joint structure of a segment according to claim 1 . 5. The segment is formed from concrete.
The joint fitting has a core constituting the segment.
Several anchors buried in concrete are connected
The method according to any one of claims 1 to 4, wherein
Junction structure of the segment. 6. An anchor according to claim 6, wherein
-A support plate is integrally formed on a surface substantially perpendicular to the axis of the muscle.
The segment joining structure according to claim 5 , wherein 7. An insertion hole formed by the joining groove portion,
Inserting the connecting fittings between the connecting fittings and the last fitting fitting
The feature is that the spacer is fitted on the rear side in the entering direction
The segment joining structure according to any one of claims 1 to 6, wherein 8. The joining groove is provided on an inner surface of the segment.
An injection hole communicating with the portion is formed, and
After the joining metal fittings are connected to each other, the injection groove is connected to the joining groove.
The filler is injected into the insertion hole consisting of the part
A joint structure for a segment according to any one of claims 1 to 7 .