JP5752909B2 - Segment joint structure - Google Patents

Description

The present invention provides a shield tunneling, with assembled circumferentially shield machine after drilling, about the joint structure of the segments relative assembled segments are connected to the tunnel axis.

  The tunnel shield construction method assembles segments such as arc-shaped sections in the circumferential direction in the rear part of the skin plate of the shield machine while excavating with the shield machine, and connects the assembled segments in the tunnel axis direction in order. It is a tunnel construction method to construct a tunnel.

  Conventionally, many joint structures for the segment have been proposed. Tunnel circumferential joints are commonly referred to as “piece-to-piece joints” and joints to assembled segments are commonly referred to as “inter-ring joints”.

  As the inter-ring joint, for example, as shown in FIG. 16, a joint that is assembled by inserting an assembly bolt 51 in an oblique direction from the assembly segment 52 toward the assembled segment 53 is known.

  On the other hand, in recent years, many proposals have been made to perform joints between rings by a one-touch method such as insertion or sliding.

  For example, in Patent Document 1 shown below, as shown in FIG. 17, they are provided on the joining end surfaces of the segments to be joined to each other, and are formed at both ends in the engagement holes of the joining cylinder 60 supported by the anchor reinforcing bar 59. By inserting the both ends of the joining rod 62 attached by fitting the piece member 61 into the formed hole portion 62a and bringing the joining end surfaces of the segments close to each other, the joining member 61 causes the joining rod to be brought close to each other. A joint structure is disclosed in which 62 is expanded and pressed against the inner peripheral surface of the engagement hole of the joining cylinder 60, and both ends of the joining rod 62 are engaged with the joining cylinder 60 to join the segments together. Has been.

  In order to join the segments, as shown in FIG. 18, first, the tip end side of the piece member 61 is fitted and attached to the holes 62 a at both ends of the joining rod 62, and the piece member 61 is attached to both ends. Are inserted into the engagement holes of the joining tube 60 of one of the segments to be joined to each other. When the joining rod 62 is supported by the joining tube 60 of one segment, the other segment is brought close to the joining tube 60 of the other segment while making the axis of each joining tube 60 coincide with each other. The joining rod 62 held in the above is inserted. When the other segment is further brought closer to the one segment, the rear end surface of the piece member 61 comes into contact with the bottom of the engagement hole of the joining tube 60 of the other segment, and then each piece member 61 is attached to the hole of the joining rod 62. By entering the portion 62 a, both end portions where the slits of the joining rod 62 are formed are pushed and expanded in the outer peripheral direction, and the joining rod 62 is reliably engaged with the joining cylinder 60.

JP 2001-159298 A

  However, in the case of the joint structure of Patent Document 1, one joint rod (joint member) 62, two piece members 61, two joint cylinders 60, two anchor rebars 59 are used as joint members per place. 7 members in total were required, and the number of members was large and expensive. Further, since the joining rod 62 is inserted into the joining cylinders 60 at both ends, there are problems such as a long insertion stroke and a long insertion time.

  Further, in this publication, when the joining rod 62 is held by one joining cylinder 60, it is supported at the bottom of the engagement hole of the joining cylinder 60 in order to prevent it from dropping or tilting during the operation. A hole is formed, and at least one of the piece members 61 is provided with a fitting protrusion that fits into the support hole. By fitting the fitting protrusion into the support hole, the joining rod 62 is Although it is held in a state of being inserted into the joining cylinder 60 (not shown), in this case, there is a problem that the structure becomes complicated.

  Therefore, the main problem of the present invention is to reduce the number of members by simplifying the structure in the joint structure of the segment connected in the tunnel axis direction to the assembled segment, and to reduce the cost per joint. Furthermore, the efficiency of the joint work is improved by shortening the insertion stroke.

In order to solve the above-mentioned problem, the present invention according to claim 1 is a joint structure of a segment connected in the tunnel axial direction to an assembled segment,
The one side anchor rebar in which the end face is exposed and embedded in the joining surface side of the one side segment to be joined, and the female screw hole is formed in the end face,
The other side anchor reinforcing bar in which the end face is exposed and embedded in the joint surface side of the other side segment to be joined, and the engagement hole is formed in the end face;
A truncated cone-shaped piece member inserted and installed in the engagement hole of the other-side anchor reinforcing bar,
It has a male screw part on one end side, and a joining member having a cylindrical part formed with a plurality of slits spaced in the circumferential direction along the axial direction on the other end side,
The male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the tubular portion of the joining member is inserted into the engagement hole of the other-side anchor reinforcing bar and is pushed by the piece member. A box-opening portion having a predetermined depth from the joint surface is formed on the one-side anchor reinforcing bar side, and an end surface is exposed on the bottom surface of the box-cutting portion to expose the one side. A joint structure for a segment is provided in which side anchor reinforcing bars are embedded .

  In the first aspect of the invention, the end face of the anchor reinforcing bar embedded in the one side segment is exposed to the outside, and the end face of the anchor reinforcing bar embedded in the other side segment is formed while the female screw hole is formed in this end face. It is exposed to the outside, and an engagement hole is formed in this end face. Also, a truncated cone-shaped piece member that is inserted and installed in the engagement hole of the other-side anchor reinforcing bar, and has a male screw portion on one end side, and a plurality of slits in the circumferential direction along the axial direction on the other end side A joining member having a cylindrical portion formed at an interval, and the male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the cylindrical portion of the joining member Is inserted into the engagement hole of the other-side anchor reinforcing bar, and is spread and fixed by the piece member so that it cannot be removed. Accordingly, a total of four members including two anchor rebars, one piece member, and one joining member are sufficient as joint members per location, so the number of members is reduced by simplifying the structure. And the cost per joint can be reduced. Further, since the insertion stroke only needs to be inserted into the engagement hole of the other side anchor reinforcing bar, it is about half of the conventional stroke, and the shortening of the insertion stroke makes it possible to improve the efficiency of the joint work. Furthermore, since the joining member is screwed and installed in the female screw hole formed in the anchor reinforcing bar of the one side segment, the joining member does not fall off or tilt during the operation.

In the present invention, to absorb manufacturing errors and assembly errors of the joint portion, one side anchor rebar to easily allow fitted between segments (male joint) is a box cut-out portion of a predetermined depth from the joint plane And the one side anchor reinforcing bar is embedded so that the end face is exposed on the bottom surface of the box opening portion. Therefore, when the joining member is screwed and connected to the one side anchor reinforcing bar and the segments are connected to each other, the joining member can move by the amount of elastic deformation in the box opening portion, so that there is a slight deviation between the joints. Can also absorb this error.

The present invention according to claim 2 is a joint structure of a segment connected in the tunnel axial direction to an assembled segment,
The one side anchor rebar in which the end face is exposed and embedded in the joining surface side of the one side segment to be joined, and the female screw hole is formed in the end face,
The other side anchor reinforcing bar in which the end face is exposed and embedded in the joint surface side of the other side segment to be joined, and the engagement hole is formed in the end face;
A truncated cone-shaped piece member inserted and installed in the engagement hole of the other-side anchor reinforcing bar,
It has a male screw part on one end side, and a joining member having a cylindrical part formed with a plurality of slits spaced in the circumferential direction along the axial direction on the other end side,
The male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the tubular portion of the joining member is inserted into the engagement hole of the other-side anchor reinforcing bar and is pushed by the piece member. A box-opening portion having a predetermined depth from the joint surface is formed on the other anchor rebar side, and an end surface is exposed on the bottom surface of the box-opening portion to expose the other side. A joint structure for a segment is provided in which side anchor reinforcing bars are embedded .

Invention described in claim 2 wherein absorbs manufacture error and assembly error of the joint portion, the other side anchor rebar in order to easily fit the segments to each other (female coupling) a predetermined depth from the junction surface A box opening portion is formed, and the other side anchor reinforcing bar is embedded so that the end face is exposed on the bottom surface of the box opening portion. Therefore, when the joining member is connected to the other side anchor reinforcing bar, the joining member can be moved by the amount of elastic deformation in the box opening portion, so that even if there is a slight deviation between the joints, this error can be absorbed. It becomes possible.

The present invention according to claim 3 is a joint structure of a segment connected in the tunnel axial direction to an assembled segment,
The one side anchor rebar in which the end face is exposed and embedded in the joining surface side of the one side segment to be joined, and the female screw hole is formed in the end face,
The other side anchor reinforcing bar in which the end face is exposed and embedded in the joint surface side of the other side segment to be joined, and the engagement hole is formed in the end face;
A truncated cone-shaped piece member inserted and installed in the engagement hole of the other-side anchor reinforcing bar,
It has a male screw part on one end side, and a joining member having a cylindrical part formed with a plurality of slits spaced in the circumferential direction along the axial direction on the other end side,
The male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the tubular portion of the joining member is inserted into the engagement hole of the other-side anchor reinforcing bar and is pushed by the piece member. A box-opening portion having a predetermined depth from the joint surface is formed on the one-side anchor reinforcing bar side, and an end surface is exposed on the bottom surface of the box-cutting portion to expose the one side. A side anchor reinforcing bar is embedded, and on the side of the other side anchor reinforcing bar, a boxed portion with a predetermined depth is formed from the joint surface, and an end surface is exposed on the bottom surface of the boxed portion so that the other side anchor reinforcing bar is There is provided a joint structure of segments characterized by being embedded .

According to a fourth aspect of the present invention, in the joining member, the male screw portion is formed to have a smaller diameter than other portions, and a buffer material is externally fitted to a base end portion of the male screw portion. The joint structure of the segment in any one of 3 is provided.

According to the fourth aspect of the present invention, in the joining member, when the male screw portion is formed to have a smaller diameter than other portions, the stepped portion at the base end of the male screw portion contacts the end surface of the one-side anchor reinforcing bar. Since it functions so as to suppress contact and elastic deformation, a cushioning material such as rubber or foamed resin is externally fitted to the base end of the male threaded portion, so that the stepped portion of the joining member and one of the joined members are screwed together. The buffer material is interposed between the end surfaces of the side anchor reinforcing bars so that elastic deformation is not hindered.

According to the far recitations Ri invention above, it becomes possible to reduce the number of members by simplifying the structure, it is possible to reduce the cost of one place per joint. In addition, the joint work can be made more efficient by shortening the insertion stroke. Furthermore, the joining member does not fall off or tilt during the operation.

Further, even if manufacturing error and assembly error in the joint portion has occurred between the segments, it is possible to easily join the segments together to absorb this error.

It is an exploded view of the segment joint structure concerning the 1st example of the present invention. FIG. It is an expanded sectional view of a segment joint structure part. The one side anchor reinforcement 1 is shown, (A) is a side view, (B) is sectional drawing. The other side anchor reinforcement 2 is shown, (A) is a side view, (B) is sectional drawing. The joining member 4 and the piece member 3 are shown, (A) is a side view, and (B) is a sectional view. It is a side view which shows the other example of the joining member 4. FIG. It is VI section enlarged view of FIG. Shows the joint procedure diagram of the segment It is an exploded view of the segment joint structure concerning the 2nd example of the present invention. It is an expanded sectional view of the segment joint structure concerning the 2nd form example. It is an exploded view of the segment joint structure concerning the 3rd example of the present invention. It is an expanded sectional view of the segment joint structure concerning the 3rd form example. It is an expanded sectional view of the segment joint structure concerning the 4th form example. It is an expanded sectional view of the segment joint structure concerning the 5th example. It is sectional drawing which shows the conventional segment joint structure (the 1). It is sectional drawing which shows the conventional segment joint structure (the 2). It is a joint procedure figure of the conventional segment joint structure (the 2).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
Segment joint structure according to the present invention, as shown in FIGS. 1 to 3, a joint structure of a segment S _T which relative assembled segments S _O is connected to the tunnel axis (inter-ring joint) while being embedded to expose an end face on the bonding surface M on one side segment S _T to be joined, and one side anchor rebar 1 female screw hole 1a is formed on the end surface, joined by the other side segment S _O The other side anchor reinforcing bar 2 with the end face exposed in the joint surface M and having the engaging hole 2a formed in the end face, and the truncated cone inserted and installed in the engaging hole 2a of the other side anchor reinforcing bar 2 A cylindrical piece having a shape piece member 3 and a male screw portion 4A on one end side, and a plurality of slits 40, 40... It consists of the joining member 4 which has 4B ,
The male screw portion 4A of the joining member 4 is screwed into the female screw hole 1a of the one-side anchor reinforcing bar 1, and the cylindrical portion 4B of the joining member 4 is engaged with the engaging hole 2a of the other-side anchor reinforcing bar 2. It is inserted, spread by the piece member 3 and fixed so as not to be removed.

  This will be described in more detail below.

  As the one-side anchor reinforcing bar 1 and the other-side anchor reinforcing bar 2, deformed reinforcing bars such as SD295A, SD295B, SD345, SD390, and SD490 are preferably used, and the one-side anchor reinforcing bar 1 shown in FIG. As shown, a female screw hole 1a is formed in the end surface, and the other side anchor reinforcing bar 2 is formed with an engagement hole 2a in the end surface as shown in FIG. As shown in FIG. 1, these anchor reinforcing bars 1 and 2 are embedded so that the end faces are exposed at the joint surface M when the segments are manufactured. Moreover, these anchor reinforcing bars 1 and 2 are arrange | positioned with sufficient precision so that it may oppose along coaxial on the time of joining.

  The engagement hole 2a of the anchor reinforcing bar 2 is a hole into which the tubular portion 4B of the joining member 4 to which the piece member 3 is attached is inserted, and the inner peripheral surface of the engagement hole 2a is axially on the entrance side. The engagement surface 11 is a tapered surface having a same diameter portion 10 formed along the same diameter and a taper surface whose diameter is gradually increased from the same diameter portion 10 toward the bottom side. The inner diameter of the same diameter portion 10 is slightly larger than the outer diameter of the tubular portion 4B of the joining member 4.

  As shown in detail in FIG. 6, the joining member 4 has a male screw portion 4 </ b> A on one end side, a hole portion 45 is formed on the other end side, and a plurality of portions along the axial direction. The slits 40, 40... Have cylindrical portions 4B formed at intervals in the circumferential direction. A truncated cone-shaped piece member 3 is attached to the cylindrical portion 4B. The piece member 3 has a taper portion 31 in which the rear peripheral surface of the straight portion 30 formed in the vicinity of the tip portion gradually increases in diameter, and the straight portion 30 at the tip portion has the same diameter in the axial direction. And a predetermined length is formed in the rear direction. Then, by fitting the straight portion 30 of the piece member 3 into the hole 45 of the tubular portion 4 </ b> B of the joining member 4, the piece member 3 is mounted in a state of being aligned with the axis of the joining member 4. In addition, the taper part 32 is formed in the front-end | tip of the straight part 30 of the said piece member 3 so that it can insert easily.

  In the embodiment shown in FIG. 6, the male screw portion 4 </ b> A has the same diameter as other portions, but depending on the diameter of the one-side anchor reinforcing bar 1, the diameter of the female screw hole 1 a must be reduced. In this case, as shown in FIG. 7, the diameter of the female screw portion 4 </ b> A can be formed smaller than that of other portions. In this case, as will be described later, even if an attempt is made to absorb manufacturing errors and assembly errors of the joint portion, the stepped portion at the base end of the male screw portion 4A comes into contact with the end surface of the one-side anchor reinforcing bar 1, thereby joining member 4 In order to suppress the elastic deformation of the joint member 4, the buffer member 9 such as rubber or foamed resin is externally fitted to the base end portion of the male screw portion 4 </ b> A so as to be screwed and connected. It is desirable to prevent the elastic deformation from being hindered by interposing the cushioning material 9 between the portion and the end face of the one-side anchor reinforcing bar 1.

  As shown in FIG. 8, a sawtooth portion 41 is formed on the outer peripheral surface of the tubular portion 4 </ b> B of the joining member 4. The sawtooth portion 41 is composed of a plurality of crest portions 42, 42... And trough portions 43, 43... Formed in the circumferential direction, and each crest portion 42 is inclined from the tip toward the intermediate side. It is an unequal side shape. That is, it can be inserted with a small resistance at the time of insertion, and after insertion, it is difficult to be pulled out by catching the sawtooth portion 41. Note that the edge of the hole 45 of the tubular portion 4B is chamfered to form a tapered portion 44.

Next, the procedure for joining the segments S _O and S _T will be described in detail with reference to FIG.

As shown in FIG. 9 (A), one piece member 3 and one joining member 4 are brought to one joint joint portion. As shown in FIG. 9 (B), the male screw portion 4A of the joining member 4 is screwed into the female screw portion 1a of the one side anchor reinforcing bar 1, and the hole 45 of the cylindrical portion 4B of the joining member 4 is inserted into the hole 45. The top end (small diameter side) of the piece member 3 is inserted and attached. Next, as shown in FIG. 9 (C), whereas the side segment S _T is the other side segment S _O slides _(Installed) side, the bridge member 3 and the other side anchor the tubular portion 4B of the joint member 4 It inserts in the engagement hole 2a of the reinforcing bar 2. After the bottom surface of the bridge member 3 (large diameter side) is in contact with the bottom surface of the engaging hole 2a, further presses the one side segment S _T, while the tubular portion 4B is pushed open by the bridge member 3, the engagement It is inserted between the joint hole 2a and the piece member 3, and is fixed so that it cannot be removed after insertion. FIG. 3 shows the fixing state. 9 shows an example in which a member having a male screw portion 4A having the same diameter as other parts is used as the joining member 4.

[Second embodiment]
The joint structure according to the second embodiment shown in FIGS. 10 and 11 is based on the joint structure according to the first embodiment, and the joint portion is manufactured on the one-side anchor reinforcing bar 1 side (male-side joint). The structure for absorbing an error and an assembly error and enabling easy fitting of segments is shown.

In the one side anchor reinforcing bar 1 side (male joint), the one side anchor as the bonding surface M to form a box cut-out portion 5 having a predetermined depth L _1, to expose the end face on the bottom of the box cut-out portion 5 The reinforcing bar 1 is embedded. On the one-side anchor reinforcing bar 1 side (male-side joint), the joining member 4 is movable (oscillated) by the amount corresponding to the elastic deformation in the box opening portion 5, so that there is a slight deviation from the female-side joint. Even if this is the case, this error can be absorbed.

  In the second embodiment, a male screw portion 4A having a smaller diameter than the other part as the joining member 4 and a member in which a buffer material 9 such as rubber or foamed resin is externally fitted to the base end portion of the male screw portion 4A is used. The example used is shown. The same applies to the third and subsequent embodiments.

[Third embodiment]
The joint structure according to the third embodiment shown in FIGS. 12 and 13 is based on the joint structure according to the first embodiment, and the joint portion is manufactured on the other side anchor reinforcing bar 2 side (female side joint). The structure for absorbing an error and an assembly error and enabling easy fitting of segments is shown.

In the other side anchor rebar 2 side, to form a box cut-out portion 6 of a predetermined depth L ₂ from the joint plane M, embedding the other side anchor rebar 2 so as to expose the end face on the bottom of the box cut-out portion 6 It is what I did. Since the joining member 4 is movable (oscillated) by an amount corresponding to the elastic deformation in the box opening 5 on the other side anchor reinforcing bar 2 side (female side joint), there is a slight deviation from the male side joint. Even if this is the case, this error can be absorbed.

[Fourth embodiment]
The joint structure according to the fourth embodiment shown in FIG. 14 is based on the joint structure according to the first embodiment, while the one side anchor reinforcing bar 1 side (male side joint) and the other side anchor reinforcing bar 2 side ( In the female-side joint), a structure for absorbing manufacturing errors and assembling errors of the joint portion so that the segments can be easily fitted to each other is shown.

In the one side anchor reinforcing bar 1 side (male joint), the one side anchor as the bonding surface M to form a box cut-out portion 5 having a predetermined depth L _1, to expose the end face on the bottom of the box cut-out portion 5 so as to embed the reinforcing bar 1, and in the other side anchor rebar 2 side, to form a box cut-out portion 6 of a predetermined depth L ₂ from the joint surface M, so as to expose the end face on the bottom of the box cut-out portion 6 The other side anchor reinforcing bar 2 is embedded.

  On the one-side anchor reinforcing bar 1 side (male-side joint), the joining member 4 is movable (oscillated) by an amount corresponding to elastic deformation in the box opening portion 5 and on the other-side anchor reinforcing bar 2 side (female-side joint) Since the joining member 4 can be moved (oscillated) by the amount corresponding to the elastic deformation even in the box opening portion 6, this error can be absorbed even if a slight deviation occurs between the joints. In the fourth embodiment, the length of the joining member 4 is longer than in other embodiments.

[Fifth embodiment]
The joint structure according to the fifth embodiment shown in FIG. 15 is also based on the joint structure according to the first embodiment, while the one side anchor reinforcing bar 1 side (male side joint) and the other side anchor reinforcing bar 2 side ( In the female-side joint), a structure for absorbing manufacturing errors and assembling errors of the joint portion so that the segments can be easily fitted to each other is shown.

On the one-side anchor reinforcing bar 1 side (male-side joint), a box opening portion 5 having a predetermined depth L ₁ is formed from the joint surface M, and the end surface is exposed on the bottom surface of the box opening portion 5. Anchor rebar 1 is buried.

On the other anchor rebar 2 side (female side joint), the periphery of the rebar 2 is surrounded by a cushioning material 7 having cushioning properties over a predetermined embedded depth range L ₂ from the end face position, and the cushioning material 7 The cross-sectional defect part 8 is formed with respect to the other side anchor reinforcing bar 2 within the arrangement range or near the buffer material burying side end. As the buffer material 7, foamed resin, rubber, or the like can be used. Moreover, the cross-sectional defect | deletion part 8 can be made into the slit groove | channel and V-shaped groove | channel formed in the circumferential direction so that it may be illustrated.

On the one-side anchor reinforcing bar 1 side (male-side joint), the joining member 4 can be moved by the amount of elastic deformation within the box-cutting portion 5, so even if there is a slight deviation from the female-side joint, It becomes possible to absorb the error. Also on the other side anchor reinforcing bar 2 side (female side joint), the cross section defect portion 8 serves as a movable point so that the anchor reinforcing bar 2 can move, and the surroundings of the reinforcing bar 2 are not disturbed by the buffer material 7. Therefore, even if there is a slight deviation between the male joint and the male joint, this error can be absorbed. The present also in the fifth embodiment, as in the fourth embodiment, after forming the box cut-out portion 6 of the other side anchor rebar second predetermined depth from the bonding surface M on the side L _2, the cushioning material 7. A cross-sectional defect 8 may be provided.

[Other examples]
(1) In the above embodiment, buried buried anchor rebar 2 formed with engagement holes 2a to of installed end segment S _O, the anchor rebar 1 formed with the female screw hole 1a in the segment S _T to newly joined It was so, then this relationship Conversely, buried anchor rebar 1 formed with the female screw hole 1a in of installed end segment S _O, to form a engaging hole 2a to the segment S _T to newly joined The anchor rebar 2 may be embedded.
(2) In the above embodiment, the joint structure of the present invention is adopted for the inter-ring joint, but this joint structure can also be adopted for the piece-to-piece joint.

DESCRIPTION OF SYMBOLS 1 ... One side anchor reinforcing bar, 1a ... Female screw hole, 2 ... Other side anchor reinforcing bar, 2a ... Engagement hole, 3 ... Piece member, 4 ... Joining member, 4A ... Male screw part, 4B ... Cylindrical part, 5. 6 ... Box opening part, 7 · 9 ... Buffer material, 8 ... Cross-sectional defect part, S _T ... One side segment, S _O ...

Claims (4)

A joint structure of segments connected in the tunnel axial direction to an assembled segment,
The one side anchor rebar in which the end face is exposed and embedded in the joining surface side of the one side segment to be joined, and the female screw hole is formed in the end face,
The other side anchor reinforcing bar in which the end face is exposed and embedded in the joint surface side of the other side segment to be joined, and the engagement hole is formed in the end face;
A truncated cone-shaped piece member inserted and installed in the engagement hole of the other-side anchor reinforcing bar,
It has a male screw part on one end side, and a joining member having a cylindrical part formed with a plurality of slits spaced in the circumferential direction along the axial direction on the other end side,
The male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the tubular portion of the joining member is inserted into the engagement hole of the other-side anchor reinforcing bar and is pushed by the piece member. A box-opening portion having a predetermined depth from the joint surface is formed on the one-side anchor reinforcing bar side, and an end surface is exposed on the bottom surface of the box-cutting portion to expose the one side. A joint structure for a segment, characterized in that side anchor reinforcing bars are embedded . A joint structure of segments connected in the tunnel axial direction to an assembled segment,
The one side anchor rebar in which the end face is exposed and embedded in the joining surface side of the one side segment to be joined, and the female screw hole is formed in the end face,
The other side anchor reinforcing bar in which the end face is exposed and embedded in the joint surface side of the other side segment to be joined, and the engagement hole is formed in the end face;
A truncated cone-shaped piece member inserted and installed in the engagement hole of the other-side anchor reinforcing bar,
  It has a male screw part on one end side, and a joining member having a cylindrical part formed with a plurality of slits spaced in the circumferential direction along the axial direction on the other end side,
The male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the tubular portion of the joining member is inserted into the engagement hole of the other-side anchor reinforcing bar and is pushed by the piece member. A box-opening portion having a predetermined depth from the joint surface is formed on the other anchor rebar side, and an end surface is exposed on the bottom surface of the box-opening portion to expose the other side. A joint structure for a segment, in which side anchor reinforcing bars are embedded. A joint structure of segments connected in the tunnel axial direction to an assembled segment,
The one side anchor rebar in which the end face is exposed and embedded in the joining surface side of the one side segment to be joined, and the female screw hole is formed in the end face,
The other side anchor reinforcing bar in which the end face is exposed and embedded in the joint surface side of the other side segment to be joined, and the engagement hole is formed in the end face;
A truncated cone-shaped piece member inserted and installed in the engagement hole of the other-side anchor reinforcing bar,
  It has a male screw part on one end side, and a joining member having a cylindrical part formed with a plurality of slits spaced in the circumferential direction along the axial direction on the other end side,
The male screw portion of the joining member is screwed into the female screw hole of the one-side anchor reinforcing bar, and the tubular portion of the joining member is inserted into the engagement hole of the other-side anchor reinforcing bar and is pushed by the piece member. A box-opening portion having a predetermined depth from the joint surface is formed on the one-side anchor reinforcing bar side, and an end surface is exposed on the bottom surface of the box-cutting portion to expose the one side. A side anchor reinforcing bar is embedded, and on the side of the other side anchor reinforcing bar, a boxed portion with a predetermined depth is formed from the joint surface, and an end surface is exposed on the bottom surface of the boxed portion so that the other side anchor reinforcing bar is Segment joint structure characterized by being embedded. The segment according to any one of claims 1 to 3 , wherein, in the joining member, the male screw portion is formed to have a smaller diameter than other portions, and a buffer material is externally fitted to a proximal end portion of the male screw portion. Joint structure.

Images