JP2009007739A - Construction method for lining, and fixing device for use in it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a lining composed of a plurality of rings adjoining one another in the axial direction of a tunnel bored by means of a shield which can reduce the construction cost of the tunnel by preventing a K-type segment from coming off from between B-type segments without the use of an automatic coupling-type joint. <P>SOLUTION: This construction method for the lining comprises: a step of forming the plurality of rings adjacently to one another in the rear of and inside the shield; a step of forming a new ring adjacently to one of the rings nearest to a cutting face; and a step of unfixably fixing the K-type segment of the new ring to the A-type or B-type segment of the one ring by means of a fixing device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for constructing a lining composed of a plurality of rings adjacent in the axial direction of a tunnel excavated using a shield, and a fixing device used therefor.

  A tunnel made of a plurality of rings adjacent to each other in the axial direction of the tunnel is constructed in the tunnel excavated using the shield. In the lining, each ring includes a plurality of adjacent A-type segments, two B-type segments each adjacent to the A-type segment, and a K-type segment between the B-type segments. .

  The length dimension of the A-shaped segment in the circumferential direction of the tunnel is constant, the length dimension of the B-shaped segment gradually increases from the face side of the tunnel toward the wellhead side, and the length of the K-shaped segment is increased. The size gradually decreases from the face side toward the wellhead side. Each of the A-type segment, the B-type segment, and the K-type segment is made of reinforced concrete.

  When constructing the lining, first, a plurality of rings are formed adjacent to each other behind the shield and in the shield. Next, a reaction force is applied to one ring that is closest to the face of the tunnel among a plurality of rings that have already been formed to propel the shield. Thereafter, a new ring is formed in the shield adjacent to the one ring.

  When forming a new ring, first, a plurality of A-type segments are arranged adjacent to each other. Next, each of the two B-type segments is disposed adjacent to the A-type segment. Thereafter, the K-shaped segment is moved in the axial direction of the tunnel and inserted between the B-shaped segments. Since the length dimension of the K-shaped segment gradually decreases from the face side toward the wellhead side, that is, the K-shaped segment is wedge-shaped, it is assumed that the interval between the B-shaped segments is an error in installation. Thus, the K-type segment can be inserted between the B-type segments even when the interval is narrower than required in the design.

  After the new ring is formed, a reaction force is applied to the new ring to propel the shield. Thereby, the new ring is not protected by the shield, and earth pressure and water pressure act on the outer surface of the new ring. For this reason, a compressive force acts on the new ring in the circumferential direction. Since the length dimension of the K-shaped segment gradually decreases from the face side toward the wellhead side, when the compressive force acts on the new ring, this is applied to the K-shaped segment of the new ring. Force to move to the face side acts. For this reason, there exists a possibility that the said K-type segment may move to the said face side, and may come out between the said B-type segments.

In the conventional construction method of the lining, the K-shaped segment of the new ring is replaced with the A-shaped segment of the one ring or the new ring when the K-shaped segment of the new ring is inserted between the B-shaped segments. It connects with the said B-type segment using an automatic connection type joint (refer patent document 1). This prevents the K-type segment from moving to the face side and coming out from between the B-type segments.
JP 2001-164890 A

  The automatic coupling joint includes a male fitting having a head protruding from the end surface on the wellhead side of the K-type segment, and a hole opened on the end surface on the face side of each of the A-type segment and the B-type segment. And a female metal fitting formed thereon. The head portion of the male fitting includes a constricted portion and an enormous portion located in front of the constricted portion. The female fitting has a pair of opposing claws, each projecting from the inner surface of the hole, and a spring that applies an elastic force to each of the claws toward the center of the hole.

  When the new ring is inserted between the B-shaped segments of the K-shaped segment, the head of the male fitting of the K-shaped segment is the A-shaped segment of the one ring or the B-shaped segment. It is received in the hole of the female fitting. At this time, the expanding portion of the female fitting contacts the claws and passes between the claws while increasing the interval between the claws while resisting the elastic force of the spring. Thereafter, the claw narrows the gap between the claws by the elastic force of the spring, and sandwiches the constricted portion of the head portion of the male fitting. Accordingly, the K-shaped segment of the new ring is connected to the A-shaped segment or the B-shaped segment of the one ring.

  The claw of the female fitting prevents the enormous portion of the head of the male fitting from coming out of the hole of the female fitting. For this reason, the K-shaped segment of the new ring does not move to the face side.

  The automatic coupling joint is expensive because of its complicated structure. Generally, in the construction of a tunnel using a shield, the manufacturing cost of the segment accounts for about 30% of the total construction cost of the tunnel, and the cost required for the automatic coupling joint is about 20% to about 20% of the manufacturing cost of the segment. Occupies 30%. For this reason, the construction cost of the tunnel is increased because the automatic coupling joint is expensive.

  An object of the present invention is a method of constructing a lining composed of a plurality of rings adjacent to each other in the axial direction of a tunnel excavated using a shield, and a K-type segment is connected between B-type segments without using an automatic coupling joint. An object of the present invention is to provide a construction method capable of reducing the construction cost of the tunnel by preventing it from coming out. Another object of the present invention is to provide a fixing device adapted to the construction method.

  In order to achieve the above object, the present invention forms a plurality of rings adjacent to each other behind the shield and in the shield, and newly adjoins one of the rings closest to the face of the tunnel. A first member that can be screwed with the socket for the erector of the K-shaped segment, a second member that can be screwed with the socket for the erector of the A-shaped segment or the B-shaped segment, and the first member; The K-shaped segment of the new ring is releasably fixed to the A-shaped segment or the B-shaped segment of the one ring by using a fixing device including a connecting means for connecting the second member.

  The construction method according to the present invention is applied to a lining composed of a plurality of rings adjacent in the axial direction of a tunnel excavated using a shield. Each ring is composed of a plurality of adjacent A-type segments, two B-type segments each adjacent to the A-type segment, and a K-type segment between the B-type segments. The length dimension of the A-shaped segment in the circumferential direction of the tunnel is constant, the length dimension of the B-shaped segment gradually increases from the face side of the tunnel toward the wellhead side, and the length of the K-shaped segment is increased. The length is gradually reduced from the face side of the tunnel toward the wellhead side. Each of the A-type segment, the B-type segment, and the K-type segment is made of reinforced concrete, and includes an erector socket in which an inner screw that is opened on the inner surface of the ring is formed.

  The construction method includes a first step of forming a plurality of rings adjacent to each other behind the shield and in the shield, and a ring closest to the face of the tunnel among the plurality of rings already formed. Taking a reaction force to propel the shield; and a new ring, wherein the K-shaped segment of the new ring is adjacent to the A-shaped segment or the B-shaped segment of the one ring, and In the shield such that the Elector socket of the K-shaped segment of the new ring is aligned with the Elector socket of the A-shaped segment or the B-shaped segment of the one ring in the axial direction of the tunnel. A third step formed adjacent to the one ring and screwable with the socket for the erector of the K-shaped segment Using a fixing device comprising one member, a second member that can be screwed with the socket for the erector of the A-type segment or the B-type segment, and a connecting means that connects the first member and the second member. The fourth step of releasably fixing the K-shaped segment of the new ring to the A-shaped segment or the B-shaped segment of the one ring adjacent thereto, and the second to fourth steps are repeated. And a fifth step. In the fifth step, after the second step to the third step are performed at least once, the K-shaped segment of the new ring is fixed to the A-shaped segment or the B-shaped segment of the one ring. Including releasing.

  After the new ring is formed adjacent to the one ring, the K-shaped segment of the new ring can be released to the A-shaped segment or the B-shaped segment of the one ring using the fixing device. Therefore, when a compressive force is applied to the new ring in the circumferential direction, the K-shaped segment does not move to the face side and escape from between the B-shaped segments. For this reason, it is possible to prevent the K-shaped segment of the new ring from slipping out between the B-shaped segments without using an automatic coupling joint.

  The fixing device used in the construction method includes a first member and a second member, each of which includes a main body portion and a male screw portion protruding from the main body portion, and a connecting means for connecting the first member and the second member. Become. The connecting means has a band shape in which a through hole into which the male screw portion of the first member is inserted is formed at one end, and a through hole into which the male screw portion of the second member is inserted is formed at the other end. It consists of members.

  Other fixing devices used in the construction method include a first member and a second member, each of which includes a main body portion in which a through hole is formed and a male screw portion protruding from the main body portion, and the first member and the first member. It comprises a connecting means for connecting two members. The connecting means is a rod-like member having one end inserted into the through hole of the first member and the other end inserted into the through hole of the second member, and a thread groove is formed at each end. The rod-shaped member and the end portions of the rod-shaped member that are screwed into the respective end portions of the rod-shaped member after insertion of the end portions of the rod-shaped member into the through-holes are removed from the through-holes. It consists of a nut to block.

  According to the present invention, after forming a new ring adjacent to one of the plurality of rings already formed that is closest to the face, the K-shaped segment of the new ring is moved to the first ring using a fixing device. In order to releasably fix to the A-type segment or B-type segment of one ring, the K-type segment of the new ring moves to the face side when a compressive force acts on the new ring in the circumferential direction. There is no escape from between the B-type segments. For this reason, it is possible to prevent the K-shaped segment of the new ring from slipping out between the B-shaped segments without using an automatic coupling joint. Thereby, the manufacturing cost of a segment can be reduced and the construction cost of the tunnel using a shield can be reduced.

  As shown in FIG. 1, a lining 14 is constructed for a tunnel 12 excavated using a shield 10. The lining 14 includes a plurality of rings 16 adjacent in the axial direction of the tunnel 12.

  As shown in FIG. 2, each ring 16 includes a plurality of adjacent A-type segments 18, two B-type segments 20 each adjacent to the A-type segment, and a K-type segment 22 between the B-type segments. Consists of. Each of A type segment 18, B type segment 20, and K type segment 22 consists of reinforced concrete.

  As shown in FIG. 3, the length dimension of the A-type segment 18 in the circumferential direction of the tunnel 12 is constant, and the length dimension of the B-type segment 20 is from the face side (downward in the drawing) of the tunnel 12 to the wellhead side. The length of the K-shaped segment 22 gradually decreases from the face side toward the wellhead side.

  Each of the A-type segment 18, the B-type segment 20, and the K-type segment 22 has an erector socket 28 in which an internal thread 26 that is opened on the inner surface 24 of the ring 16 is formed. When the A type segment 18, the B type segment 20, and the K type segment 22 are assembled to form the ring 16, the socket 28 for the erector is configured so that each of the A type segment 18, the B type segment 20, and the K type segment 22 is an erector (see FIG. (Not shown). Moreover, the socket 28 for electors is used also as an injection hole for grout.

  The A-shaped segment 18 includes a pin 30 protruding from one side surface in the circumferential direction of the ring 16 and a groove 32 formed on the other side surface and extending in the axial direction of the tunnel 12. One B-shaped segment 20 a has a pin 30 protruding from one side surface and a groove 34 formed on the other side surface and extending in the axial direction of the tunnel 12 and opened at the end surface on the face side. The other B-shaped segment 20b is formed on one side surface and extends in the axial direction of the tunnel 12, and is opened on the end surface on the face side, and is formed on the other side surface and extends in the axial direction of the tunnel 12. 32. The K-shaped segment 22 has a pin 30 protruding from each of the two side surfaces.

  Of the two adjacent A-type segments 18, the other side surface of one A-type segment 18 is in contact with the one side surface of the other A-type segment 18. The pin 30 protruding from the one side surface of the other A-type segment 18 is received in a groove 32 formed on the other side surface of the other A-type segment 18. This prevents two adjacent A-type segments 18 from moving in the radial direction of the ring 16 with respect to the other A-type segment 18.

  The one side surface of one B-type segment 20 a is in contact with the other side surface of the A-type segment 18, and the pin 30 protruding from the one side surface of one B-type segment 20 a It is received in a groove 32 formed on the other side surface. Further, the other side surface of the other B-type segment 20b is in contact with the one side surface of the A-type segment 18, and a pin 30 protruding from the side surface is formed on the other side surface of the other B-type segment 20b. The groove 32 is received. This prevents the one B-type segment 20 a and the other B-type segment 20 b from moving in the radial direction of the ring 16 with respect to the A-type segment 18.

  One side surface and the other side surface of the K-type segment 22 are in contact with the other side surface of one B-type segment 20a and the one side surface of the other B-type segment 20b, respectively. The pin 30 protruding from the one side surface of the K-shaped segment 22 is received in the groove 34 formed on the other side surface of the one B-shaped segment 20a, and the pin protruding from the other side surface of the K-shaped segment 22 30 is received in the groove 34 formed on the one side surface of the other B-type segment 20b. This prevents the K-type segment 22 from moving in the radial direction of the ring 16 with respect to the one B-type segment 20a and the other B-type segment 20b.

  The K-shaped segments 22 of the plurality of rings 16 are arranged in a staggered manner as shown in FIG. That is, of the two adjacent rings 16, the K-shaped segment 22 of the ring 16 positioned on the face side and the K-shaped segment 22 of the ring 16 positioned on the wellhead side are not adjacent to each other. In the illustrated example, the K-type segment 22 of the ring 16 located on the face side is adjacent to the B-type segments 20a and 20b of the ring 16 located on the wellhead side. Each of the A-type segment 18 and the B-type segments 20a, 20b of the ring 16 located on the face side is at least of the A-type segment 18, the B-type segments 20a, 20b, and the K-type segment 22 of the ring 16 located on the wellhead side. Adjacent to the two. The K-type segment 22 of the ring 16 located on the face side is replaced with the A-type segment of the ring 16 located on the wellhead side instead of the illustrated example adjacent to the B-type segments 20a and 20b of the ring 16 located on the wellhead side. 18 may be adjacent.

  Each of the A-type segment 18, the B-type segments 20 a and 20 b, and the K-type segment 22 has a pin 36 protruding from the end surface on the wellhead side, and a hole 38 that is formed on the end surface on the face side and receives the pin 36.

  Of the two adjacent rings 16, the pin 36 protruding from the end face on the wellhead side of the K-shaped segment 22 of the ring 16 located on the face side is the face side of the B-type segments 20 a and 20 b of the ring 16 located on the wellhead side. Is received in a hole 38 formed in the end face of the. The pins 36 projecting from the end surfaces on the wellhead side of the A type segment 18 and the B type segments 20a and 20b of the ring 16 located on the face side are respectively the A type segment 18 and the B type segment 20a of the ring 16 located on the wellhead side. , 20b or K-shaped segment 22 is received in a hole 38 formed in the end face on the face side. This prevents the ring 16 located on the face side from moving in a direction perpendicular to the axis of the ring 16 with respect to the ring 16 located on the wellhead side.

  The pin 36 has a constant thickness, and the hole 38 is not provided with a pair of opposing claws protruding from the inner surface thereof and a spring that applies an elastic force to the claws toward the center of the hole. That is, the pin 36 and the hole 38 are different from the male fitting and female fitting of the automatic coupling joint, respectively, and the K-shaped segment 22 of the ring 16 located on the face side and the B-shaped segment 20a of the ring 16 located on the wellhead side. , 20b is not connected using an automatic connecting joint. Also, each of the A-type segment 18 and B-type segments 20a and 20b of the ring 16 located on the face side, and the A-type segment 18, B-type segment 20 and K-type segment 22 of the ring 16 located on the wellhead side. The connection using the automatic connection type joint is not made.

  When constructing the lining 14, first, a plurality of rings 16 are formed adjacent to each other behind the shield 10 and in the shield 10. Next, a reaction force is applied to the ring 16a closest to the face of the tunnel 12 among the plurality of rings 16 already formed, and the shield 10 is pushed into the ground 40 (FIG. 1). A plurality of shield jacks 42 are disposed in the shield 10, and propulsion of the shield 10 into the ground 40 is performed using the shield jack 42. A new space is formed in the shield 10 by the propulsion of the shield 10.

  Next, as shown in FIG. 4, a new ring 16b is formed in the space adjacent to the ring 16a. At this time, as shown in FIG. 5, the K-shaped segment 22 of the new ring 16b is adjacent to the B-shaped segment 20 of the ring 16a, and the erector socket 28 of the K-shaped segment 22 of the new ring 16b is connected to the ring 16a. The B-shaped segment 20 is aligned in the axial direction of the socket 28 for the elector and the tunnel 12.

  When forming a new ring 16b, first, a plurality of A-type segments 18 are arranged adjacent to each other. At this time, of the two adjacent A-type segments 18, the groove 32 formed on the other side surface of one A-type segment 18 has a pin 30 protruding from the one side surface of the other A-type segment 18. Accept (Figure 3). Further, the pin 36 protruding from the end face on the wellhead side of each A type segment 18 is received in a hole 38 formed in the end face on the face side of the A type segment 18 or the B type segments 20a, 20b of the ring 16a.

  Next, each of the two B-type segments 20 is disposed adjacent to the A-type segment 18. At this time, the pin 30 protruding from the one side surface of one B-type segment 20a is received in the groove 32 formed on the other side surface of the A-type segment 18, and the other B-type segment 20b is connected to the other side. A pin 30 protruding from the one side surface of the A-shaped segment 18 is received in the groove 32 formed on the side surface (FIG. 3). Further, the pin 36 protruding from the end face on the wellhead side of each B type segment 20a, 20b is a hole formed on the end face on the face side of the A type segment 18, B type segment 20a, 20b or K type segment 22 of the ring 16a. 38.

  Thereafter, the K-type segment 22 is inserted between the B-type segments 20 from the face side toward the wellhead side. At this time, the pin 30 protruding from the one side surface of the K-type segment 22 is received in the groove 34 formed on the other side surface of the one B-type segment 20a, and from the other side surface of the K-type segment 22 The protruding pin 30 is received in the groove 34 formed on the one side surface of the other B-type segment 20b. Further, the pin 36 protruding from the end face on the wellhead side of the K-type segment 22 is received in a hole 38 formed in the end face on the face side of the B-type segments 20a and 20b of the ring 16a. In addition, since the groove 34 of each B type segment 20a, 20b is open | released by the end surface by the side of each B type segment 20a, 20b, even after arrangement | positioning of both B type segments 20a, 20b, a K type segment Twenty-two pins 30 can be received.

  Since the length dimension of the K-type segment 22 in the circumferential direction of the tunnel 12 gradually decreases from the face side toward the wellhead side, the interval between the B-type segments 20 is temporarily required for design due to installation errors. The K-type segment 22 can be inserted between the B-type segments 20 even when it becomes narrower than the interval.

  When the new ring 16b is formed, the K-shaped segment 22 of the new ring 16b is replaced with the example shown in FIG. 5 in which the K-shaped segment 22 of the new ring is adjacent to the B-shaped segment 20 of the ring 16a. It may be adjacent to the A-shaped segment 18 of the ring 16a. In this case, the erector socket 28 of the K-shaped segment 22 of the new ring 16 b is aligned with the erector socket 28 of the A-shaped segment 18 of the ring 16 a in the axial direction of the tunnel 12.

  Thereafter, as shown in FIG. 6, the fixing device 44 is used to releasably fix the K-shaped segment 22 of the new ring 16b to the B-shaped segment 20 of the ring 16a adjacent thereto. The fixing device 44 includes a first member 46 that can be screwed with the socket 28 for the elector of the K-type segment 22, a second member 48 that can be screwed with the socket 28 for the elector of the A-type segment 18 or the B-type segment 20, It comprises a connecting means 50 for connecting the first member 46 and the second member 48.

  In the example shown in FIG. 7, each of the first member 46 and the second member 48 of the fixing device 44 includes a main body portion 52 and a male screw portion 54 protruding from the main body portion. The connecting means 50 of the fixing device 44 has a through hole 56 into which the male screw portion 54 of the first member 46 is inserted at one end, and a through hole 58 into which the male screw portion 54 of the second member 48 is inserted. It consists of a belt-like member 60 formed in the part.

  When the K-shaped segment 22 of the new ring 16b is releasably fixed to the B-shaped segment 20 of the ring 16a by using the fixing device 44, first, the belt-shaped member 60 is disposed along the inner surfaces of the new ring 16b and the ring 16a. To do. At this time, the through hole 56 of the band-shaped member 60 is aligned with the socket 28 for the E-shaped segment 22 of the new ring 16b, and the through-hole 58 of the band-shaped member 60 is aligned with the Elector socket 28 of the B-shaped segment 20 of the ring 16a. To be aligned.

  Next, the male thread portion 54 of the first member 46 is inserted into the through hole 56 of the belt-shaped member 60, and is screwed into the inner thread 26 of the socket 28 for the elector of the K-shaped segment 22 of the new ring 16b. Further, the male thread portion 54 of the second member 48 is inserted into the through hole 58 of the belt-shaped member 60 and is screwed into the inner thread 26 of the socket 28 for the elector of the B-type segment 20 of the ring 16a. In this way, the fixing device 44 is attached to the ring 16b and the ring 16a.

  The first member 46 screwed with the socket 28 for the E-shaped member of the K-shaped segment 22 of the new ring 16b and the second member 48 screwed with the B-shaped segment 20 of the ring 16a are connected by the belt-shaped member 60. Therefore, the K-shaped segment 22 of the new ring 16b does not move away from the B-shaped segment 20 of the ring 16a to the face side.

  If the K-shaped segment 22 of the new ring 16b is adjacent to the A-shaped segment 18 of the ring 16a, the new K-shaped segment 22 of the ring 16b can be released to the B-shaped segment 20 of the ring 16a using the fixing device 44. 6 is fixed to the A-type segment 18 of the ring 16a so as to be releasable by using the fixing device 44 instead of the example shown in FIG.

  After the K-shaped segment 22 of the new ring 16b is releasably fixed to the B-shaped segment 20 of the ring 16a using the fixing device 44, the tunnel 12 of the plurality of rings 16 already formed as shown in FIG. The shield 10 is propelled into the ground 40 by applying a reaction force to the ring closest to the face, that is, the ring 16b. At this time, the shield jack 42 is extended, and the shield 10 is pushed out toward the ground 40 while the shield jack bears a reaction force from the ring 16b. After the shield 10 is propelled, the shield jack 42 is retracted.

  Due to the propulsion of the shield 10, the ring 16 b is not protected by the shield 10. For this reason, earth pressure and water pressure act on the outer surface of the ring 16b, and a compressive force in the circumferential direction of the ring acts on the ring 16b. Since the length of the K-shaped segment 22 in the circumferential direction of the tunnel 12 gradually decreases from the face side toward the wellhead side, the compressive force acts on the ring 16b, so that the K-type segment 22 of the ring 16b is cut into the face. The force which tries to move to the side acts.

  Since the K-shaped segment of the ring 16b is releasably fixed to the B-shaped segment 20 of the ring 16a by using the fixing device 44, the compression force acts on the ring 16b so that the K-shaped segment 22 of the ring 16b is on the face side. Never move to. That is, the K-shaped segment 22 of the ring 16b does not come out between the B-shaped segments 20. For this reason, it is possible to prevent the K-type segment 22 of the ring 16b from coming out between the B-type segments 20 without using an automatic coupling joint. Thereby, the manufacturing cost of a segment can be reduced and the construction cost of the tunnel using a shield can be reduced.

  Thereafter, a new ring (not shown) is formed in the shield 10 adjacent to the ring 16b, similar to when the ring 16b is formed. Thereafter, the fixing device 44 is removed from the ring 16b and the ring 16a, and the fixing of the K-shaped segment 22 of the ring 16b to the B-shaped segment 20 of the ring 16a is released. Since the new ring formed adjacent to the ring 16b prevents the K-shaped segment 22 of the ring 16b from moving to the face side, the K-shaped segment 22 of the ring 16b There is no escape from between the B-type segments 20.

  Thereafter, the ring 16b and the fixing device 44 removed from the ring 16a are used to releasably fix the K-shaped segment of the new ring to the A-shaped segment 18 or the B-shaped segment 20 of the adjacent ring 16b. By using the fixing device 44 in this way, the lining 14 can be constructed more economically. In order to releasably fix the K-shaped segment of the new ring to the A-shaped segment 18 or B-shaped segment 20 of the ring 16b, instead of the above example using the fixing device 44 removed from the ring 16b and the ring 16a, A newly prepared fixing device 44 may be used.

  Thereafter, the shield 10 is propelled, a new ring is formed adjacent to one of the plurality of rings 16 already formed closest to the face, and the K of the new ring using the fixing device 44 Repeatedly releasably securing the mold segment to the A-shaped segment 18 or B-shaped segment 20 of the one ring adjacent thereto.

  The release of the fixation of the K-shaped segment 22 of the ring 16b to the B-shaped segment 20 of the ring 16a replaces the above example which is made after one new ring is formed adjacent to the ring 16b, and a plurality of new It may be done after the ring is formed adjacent to ring 16b. In this case, the ring 16b and the fixing device 44 removed from the ring 16a can be attached to the two rings closest to the face among the plurality of new rings formed after the formation of the ring 16b.

  In the example shown in FIG. 9, the connecting means 50 of the fixing device 44 is replaced with a rod-like member 62 and nuts 64 screwed to the respective end portions of the rod-like member, instead of the example shown in FIG. Become. The rod-shaped member 62 has a thread groove at each end. Each of the first member 46 and the second member 48 of the fixing device 44 has a through hole 66 formed in the main body portion 52.

  In this case, when the K-shaped segment 22 of the new ring 16b is releasably fixed to the B-shaped segment 20 of the ring 16a using the fixing device 44, the male thread portion 54 of the first member 46 is first attached to the new ring 16b. The inner thread 26 of the socket 28 for the elector of the K-shaped segment 22 is screwed. Further, the male thread portion 54 of the second member 48 is screwed into the inner thread 26 of the socket 28 for the elector of the B-type segment 20 of the ring 16a.

  Next, one end of the rod-shaped member 62 is inserted into the through hole 66 of the first member 46, and the other end of the rod-shaped member 62 is inserted into the through hole 66 of the second member 48. Thereafter, the nut 64 is screwed into each end of the rod-shaped member 62 and tightened until it comes into contact with each of the first member 46 and the second member 48. In this way, the fixing device 44 is attached to the ring 16b and the ring 16a. The nut 64 prevents the end portions of the rod-shaped member 62 from coming out of the through hole 66. Since the first member 46 and the second member 48 are connected by the rod-shaped member 62 and the nut 64 screwed to each end thereof, the K-shaped segment 22 of the new ring 16b is replaced with the B-shaped segment of the ring 16a. It does not move away from 20 to the face side.

The longitudinal cross-sectional view of the tunnel lining excavated using the shield. FIG. 3 is a cross-sectional view of the lining at line 2 in FIG. 1. The developed view of the ring which comprises a lining. The longitudinal cross-sectional view of the lining after formation of a new ring. The perspective view of the lining after formation of a new ring. The perspective view of the lining after fixing the K-shaped segment of a new ring to the B-shaped segment of the ring nearest to the cutting face using a fixing device among a plurality of rings already formed. The side view of the fixing device which concerns on this invention. The longitudinal cross-sectional view of the lining after taking the reaction force to a new ring and pushing a shield. The side view of the other fixing device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shield 12 Tunnel 14 Covering 16 Ring 18 A-type segment 20 B-type segment 22 K-type segment 24 Inner surface 26 Inner screw 28 Elector socket 44 Fixing device 46 First member 48 Second member 50 Connecting means 52 Main body portion 54 Male screw portion 56, 58, 66 Through hole 60 Strip member 62 Rod member 64 Nut

Claims (3)

A method of constructing a lining consisting of a plurality of rings adjacent in the axial direction of a tunnel excavated using a shield,
Each ring is composed of a plurality of adjacent A-type segments, two B-type segments each adjacent to the A-type segment, and a K-type segment between the B-type segments. The length dimension in the circumferential direction is constant, the length dimension of the B-type segment is gradually increased from the face side of the tunnel toward the wellhead side, and the length dimension of the K-type segment is the face side of the tunnel The socket for an erector which is gradually reduced from the pit side toward the wellhead, each of the A-type segment, the B-type segment and the K-type segment is made of reinforced concrete, and an internal thread is formed on the inner surface of the ring. ,
The construction method includes a first step of forming a plurality of rings adjacent to each other behind the shield and in the shield;
A second step of propelling the shield by taking a reaction force on one ring closest to the face of the tunnel among a plurality of rings already formed;
A new ring, wherein the K-shaped segment of the new ring is adjacent to the A-shaped segment or the B-shaped segment of the one ring, and the erector socket of the K-shaped segment of the new ring is A third step of forming in the shield adjacent to the one ring so as to be aligned in the axial direction of the tunnel with the socket for the Elector of the A type segment or the B type segment of one ring;
A first member screwable with the socket for the erector of the K-shaped segment, a second member screwable with the socket for the erector of the A-shaped segment or the B-shaped segment, the first member and the first member First, the K-type segment of the new ring is releasably fixed to the A-type segment or the B-type segment of the one ring adjacent to the new ring by using a fixing device including a connecting means for connecting two members. 4 steps,
And a fifth step repeating the second step to the fourth step,
In the fifth step, after the second step to the third step are performed at least once, the K-shaped segment of the new ring is fixed to the A-shaped segment or the B-shaped segment of the one ring. A method of constructing a lining, including releasing   It is a fixing device used for the construction method of the lining of Claim 1, Comprising: The 1st member and 2nd member which each consist of a main-body part and the external thread part which protrudes from this main-body part, The said 1st member and the said A connecting means for connecting the second member, wherein the connecting means has a through hole into which the male screw portion of the first member is inserted at one end, and the male screw portion of the second member is inserted therein. A fixing device comprising a belt-like member having a through hole formed at the other end.   It is a fixing device used for the construction method of the lining of Claim 1, Comprising: Each of the 1st member and 2nd member which consist of the main-body part in which the through-hole was formed, and the external thread part which protrudes from this main-body part, And a connecting means for connecting the first member and the second member, wherein the connecting means has one end inserted into the through hole of the first member and the other end of the second member. A rod-shaped member to be inserted into the through-hole and having a thread groove formed at each end, and a screw at each end of the rod-shaped member after insertion of each end of the rod-shaped member into the through-hole. A fixing device comprising a nut that prevents the end portions of the rod-shaped members from coming out of the through holes.

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