JP2007224570A - Shield lining segment, shield lining structure, and method of constructing shield lining structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shield lining segment which exerts excellent rigidity to stress applied to a joint connecting the segments in a tunnel axial direction or concrete around the joint, and bending moment imposed by a shield jack during construction work, even if the width thereof in the tunnel axial direction is extended, and to provide a shield lining structure and a method of assembling the shield lining structure. <P>SOLUTION: The shield lining segment 1 is formed of: steel pipes 10 penetrating both edges of the segment 1 in the tunnel axial direction; and the joints 12 arranged at both edges of each steel pipe 10 for connecting the steel pipes 10 of the respective segments 1 adjacent to each other in the tunnel axial direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield lining segment for reinforcing and holding an excavation hole after tunnel excavation, a shield lining body, and a method for constructing a shield lining body.

  FIG. 6 shows a conventional general segment structure. The segment 60 has a concrete 64 as a base material, a main reinforcement 66 disposed in the circumferential direction of the tunnel, a distribution bar 68 disposed in the tunnel axial direction, and a shear reinforcement 70 that binds the outer and inner main reinforcement 66. And a joint 72 for connecting to a segment adjacent in the tunnel axial direction, and an anchor bar 74 for fixing and supporting the joint 72 to the concrete 64.

Among such segment structures, as a configuration of the joint 72, for example, one disclosed in Patent Document 1 or 2 is known.
That is, Patent Document 1 proposes a joint composed of a mechanical male member composed of two hook-shaped leaf springs and a female member engaged with the male member. Further, in Patent Document 2, a male member having a body portion that swells in a spindle shape, and is easily fitted to the male member, and is fixedly supported after fitting, and does not come off the fitted male member. A joint composed of a female member having a shape has been proposed.

These joints according to Patent Documents 1 and 2 both simplify the connecting operation of the segments for shielding lining, and improve the structural rigidity of the entire shielding lining after assembly.
Japanese Patent Laid-Open No. 11-223094 JP 2004-19378 A

  By the way, it is desirable to reduce the number of segment installations in order to improve the efficiency of the installation work of the segments constituting the shield covering body. For this purpose, it is conceivable to increase the segment width in the tunnel axis direction.

  However, as described in Patent Document 1 or 2, in the configuration in which the joint is fixed to the segment and the segments are connected by the joint, if the segment width is increased, the ground or groundwater applied to the outer peripheral surface of the segment in the tunnel circumferential direction The load by the joints and the like also increases, and the load applied to the joint that fixes and supports the segments also increases. Accordingly, stress concentrates on the joint and the surrounding concrete. Furthermore, when the load applied to the outer circumferential surface of the segment in the tunnel circumferential direction increases, it is necessary to increase the amount of reinforcing bars and increase the concrete thickness in order to strengthen the segment structure. For this reason, the manufacturing cost of the segment increases due to the increase in the amount of reinforcing bars, and the face diameter of the tunnel also increases due to the increase in the concrete thickness, which may lead to an increase in the amount of excavation and conversely the work efficiency may deteriorate. There is.

  Furthermore, the segment receives not only a load from the ground or groundwater during operation, but also a load from a shield jack provided in a shield machine for excavating a tunnel, for example, during construction. In the shield machine, a plurality of shield jacks provided in the shield machine are brought into contact with the segment end in the tunnel axis direction, and the jack is extended to take a reaction force on the segment to dig the face. At this time, the load applied to the segment from the jack becomes uneven, and a bending moment that bends the tunnel axis in the segment may occur.If this bending moment exceeds the bending rigidity of the segment, the segment will be damaged. In some cases, there is a risk of buckling.

  The present invention has been made in view of the above points, and even if the segment width in the tunnel axis direction is increased, the stress applied to the joint connecting the segments in the tunnel axis direction or the surrounding concrete, and shielding during construction An object of the present invention is to provide a shield lining segment, a shield lining body, and a method for assembling the shield lining body that have excellent rigidity with respect to a bending moment received from a jack.

To achieve the above object, the present invention is a segment for shielding lining,
A rigid member penetrating between both ends in the tunnel axis direction of the segment;
And a joint structure for connecting the rigid members of the segments adjacent to each other in the tunnel axial direction, provided at an end of the rigid member (first invention).

  According to the shield lining segment according to the present invention, the rigid member provided so as to penetrate between both ends in the tunnel axial direction is connected to the rigid member of the adjacent segment by the joint provided at both ends. The rigid member is integrated across the segments and reinforces the entire shield covering body. As a result, even when a large shear stress or bending stress occurs between adjacent segments in the tunnel axis direction, the stress propagates through all the connected rigid members without concentrating on the joint and surrounding concrete. And can be dispersed throughout the shield lining. As a result, the segment width in the tunnel axis direction can be increased, and the efficiency of the segment installation work can be improved.

  Further, according to the segment for shielding lining according to the present invention, the rigidity member in the tunnel axis direction is improved for each segment itself by providing the rigid member in the tunnel axis direction in the segment. Thereby, since the concrete thickness of a segment can be designed thinly, the tunnel face diameter can be suppressed to the minimum, and the construction period can be shortened because the amount of excavation is reduced. In addition, when the concrete thickness is reduced, the weight of the segment is reduced, so that the load on the segment, which is a segment installation facility during construction, can be reduced. Thus, the erector can be reduced in size. Furthermore, the production cost can be reduced because the amount of concrete can be reduced when producing the segments.

  Further, according to the segment for shielding lining according to the present invention, the rigid member not only improves the rigidity of the segment but also has a function of fixing and supporting the joint. Thereby, it is not necessary to provide an anchor bar in a joint, and it can contribute to weight reduction of a segment and reduction of manufacturing cost.

  In addition, according to the segment for shielding lining according to the present invention, by providing a rigid member in the tunnel axis direction within the segment, the load resistance against the bending moment applied to the segment in the tunnel axis direction is improved, such as a shield jack. It is possible to suppress segment damage due to the load, and hence buckling.

  According to a second invention, in the first invention, the rigid member is a steel material.

  The third invention is characterized in that, in the first invention, the base material is concrete mixed with steel fibers.

  According to the segment for shielding lining according to the present invention, the strength and toughness of the entire segment is improved by using concrete mixed with steel fibers as a base material. That is, the thickness of the segment can be further reduced, and the segment width in the tunnel axis direction can be further increased. In addition, by using concrete mixed with steel fibers as a base material, it is not necessary to provide a distribution bar arranged in the segment, so the rebar structure in the segment is simplified, and in the manufacturing process of the segment, Since it becomes easy to place concrete without gaps, a high-quality concrete structure can be manufactured.

A fourth invention is characterized in that, in the first invention, a tenon structure capable of fitting with the segment adjacent in the tunnel circumferential direction is provided at an end of the segment in the tunnel circumferential direction.
According to the segment for shield lining according to the present invention, it is possible to suppress the deviation between the segments due to the shear stress applied in the circumferential direction of the tunnel. In addition, since no joint structure is required in the circumferential direction of the tunnel, it is possible to contribute to reducing the weight of the segment and the manufacturing cost.

  5th invention is the shield lining body using the segment as described in 1st-4th invention, Comprising: The said rigid members of the segment adjacent to a tunnel axial direction are connected by the said joint structure. Features.

In a sixth aspect based on the fifth aspect, the segments are arranged in a staggered manner such that the positions of the junctions in the tunnel circumferential direction are different from the positions of the junctions in the tunnel circumferential direction in the adjacent segments in the tunnel axial direction. The rigid member of each segment is provided so as to be arranged on the same straight line as the rigid member of the segment adjacent in the tunnel axis direction in a state where the segments are arranged in a staggered manner.
According to the shield wrapping body according to the present invention, even when a load is applied to the joint portion in the tunnel circumferential direction of the segment corresponding to the structural weakened portion by arranging the segments in a staggered arrangement, the load is Since the structure is fixed and supported by the segment and the segment adjacent to the tunnel axis direction, the rigidity of the shield covering body in the tunnel circumferential direction can be made uniform.

  7th invention is the construction method of the shield covering body using the segment as described in 1st-4th invention, Comprising: The said rigid member of the segment adjacent to a tunnel axial direction is connected by the said joint structure. It is characterized by.

  In an eighth aspect based on the seventh aspect, the segments are arranged in a zigzag manner such that the position of the junction in the tunnel circumferential direction is different from the position of the junction in the tunnel circumferential direction in the segment adjacent to the tunnel axial direction. In addition, the rigid member of each segment is arranged so as to be collinear with the rigid member of the segment adjacent in the tunnel axis direction in a state where the segments are arranged in a staggered manner.

  According to the present invention, even if the segment width in the tunnel axial direction is increased, the joint is excellent in terms of the stress applied to the joint connecting the segments in the tunnel axial direction or the surrounding concrete, and the bending moment received from the shield jack during construction. And a method for assembling the shield covering body and the shield covering body having high rigidity.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of the structure of a segment 1 according to this embodiment. FIG. 1 (a) shows a cross-sectional view of the structure, and FIG. 1 (b) shows a development view taken along the line AA of FIG. FIG. 2 is a perspective view showing an example of the shield lining body 22 constructed by assembling the segments 1.

  As shown in FIG. 1, the segment 1 includes a steel pipe 10 penetrating between both ends in the tunnel axis direction in the segment 1, and the steel pipe 10 has a steel pipe 10 of the segment 1 adjacent to the end in the tunnel axis direction. And a joint 12 for connecting the two. In the segment 1, a main reinforcing bar 14 and a shear reinforcing bar 16 are disposed. And as a concrete base material which comprises a segment, Preferably the steel fiber mixed concrete 18 which mixed the steel fiber is used. Further, the end of the segment 1 in the circumferential direction of the tunnel preferably has a tenon structure 20 that can be fitted to the segment 1 adjacent in the circumferential direction.

  The steel pipes 10 are arranged at equal intervals along the circumferential direction when a segment ring is formed by joining the segments 1 in an annular shape in the circumferential direction of the tunnel. For example, in FIG. 2, 16 steel pipes 10 are provided at equal intervals along the circumference. In addition, when a segment ring is formed by the segments 1 having different sizes, for example, as shown in the figure, one steel pipe 10 is arranged in the small segment 1 and three steel pipes 10 are arranged in the large segment 1. The number of steel pipes 10 distributed according to the segment size is different.

  These segments 1 are moved to a predetermined position using, for example, an erector (not shown) which is a segment installation facility, and the ends of the steel pipes 10 of the adjacent segments are connected by a joint 12 in the tunnel axis direction. In addition, the tenon structure 20 between adjacent segments is fitted in the circumferential direction of the tunnel.

  At this time, when the segment ring is formed, the installation position of the segment 1 is such that the position of the junction portion in the tunnel circumferential direction of the segment 1 forming the segment ring is the position of the junction portion in the tunnel circumferential direction in the adjacent segment in the tunnel axis direction. A staggered arrangement different from the position is preferred. For example, as shown in FIG. 2, the junction a between the segments in the tunnel circumferential direction of the segment ring 24a, and the junction b between the segments in the tunnel circumferential direction of the segment ring 24a adjacent to the segment ring 24b in the tunnel axial direction Are arranged so that they are not on the same straight line. As described above, since the steel pipes 10 are arranged at equal intervals along the circumference of the segment ring, even if the segments 1 are installed in a staggered manner, the segments adjacent in the tunnel axis direction Since each steel pipe 10 of 1 each is arrange | positioned on the same straight line, it can connect with the coupling 12. FIG. Thereby, the steel pipe 10 is integrated over each segment 1, and becomes a rigid member which reinforces the shield covering body 22 continuously.

  By repeatedly performing such installation work of the segment 1 in the circumferential direction of the tunnel, a segment ring is formed, and the shield ring 22 is constructed by installing the segment ring so as to extend in the tunnel axis direction. .

  As described above, according to the segment 1 according to the present embodiment, the steel pipe 10 provided so as to penetrate between both ends in the tunnel axis direction is connected to the steel pipe 10 of the adjacent segment by the joint 12 provided at both ends. The joint 12 is connected and integrated across the segments 1 to provide a rigid member that reinforces the entire shield cover 22. As a result, even when a large shearing stress or bending stress is generated between the segments 1 adjacent to each other in the tunnel axis direction, the stress is not concentrated on the joint 12 and its peripheral portion, and all of the connected steel pipes 10 are connected. It can propagate and be distributed throughout the shield wrap 22. As a result, the segment width in the tunnel axis direction can be increased, and the efficiency in installing the segment 1 can be improved.

  Further, according to the segment 1 according to the present embodiment, the tunnel axis direction steel pipe 10 is provided in the segment 1, so that the rigidity in the tunnel axis direction is also improved in each segment 1. Thereby, since the concrete thickness of the segment 1 can be designed thin, the tunnel face diameter can be suppressed to the minimum, and the construction period can be shortened because the amount of excavation is reduced. Moreover, the dead weight of the segment 1 can also be reduced by reducing the concrete thickness. For this reason, since the load load of the segment concerning the erector which is the equipment for segment installation at the time of construction can also be reduced, it can contribute to size reduction of the erector. Furthermore, since the amount of concrete can be reduced when the segment 1 is manufactured, the manufacturing cost can be reduced.

  Further, according to the segment 1 according to the present embodiment, the steel pipe 10 has a function of not only improving the rigidity of the segment 1 but also fixing and supporting the joint 12. Thereby, it is not necessary to provide the anchor bar 74 as shown in FIG. 6, and it can contribute to the weight reduction of a segment and reduction of manufacturing cost.

  Further, according to the segment 1 according to the present embodiment, for example, even if a nonuniform load is applied to the end of the segment 1 in the tunnel axial direction from a shield jack provided in a shield machine for excavating a tunnel, By providing the steel pipe 10 in the tunnel axial direction, the load resistance against the bending moment can be improved, and the damage to the segment 1 and, consequently, the buckling can be suppressed.

  Moreover, according to the segment 1 by this embodiment, the strength and toughness of the segment 1 whole improve by using the steel fiber mixed concrete 18 for a concrete base material. That is, the thickness of the segment 1 can be further reduced, and the segment width in the tunnel axis direction can be further increased. Further, by using the steel fiber mixed concrete 18, it is not necessary to provide a distribution bar 68 as shown in FIG. 6 in the segment 1. Thereby, the reinforcing bar structure in the segment 1 is simplified, and it becomes easy to place the concrete without any gaps in the manufacturing process of the segment 1, so that a high-quality concrete structure can be manufactured.

  In addition, according to the segment 1 according to the present embodiment, the shear stress applied in the tunnel circumferential direction is provided at the end of the segment 1 in the tunnel circumferential direction by having the tenon structure 20 that can be fitted to the segment 1 adjacent in the circumferential direction. It is possible to suppress the deviation between the segments 1 due to. In addition, since no joint structure is required in the circumferential direction of the tunnel, it is possible to contribute to weight reduction of the segment 1 and reduction of manufacturing cost.

  Further, according to the shield wrapping body 22 according to the present embodiment, the assembly of the segments 1 is arranged in a staggered arrangement, so that the joints in the tunnel circumferential direction of the segments 1 that are structurally equivalent to the weak parts (for example, the joints) Even if a load is applied to a or b), the load is fixed and supported by two segments adjacent to the segment 1 in the tunnel axial direction. The rigidity can be made uniform.

  In addition, as the joint 12 which connects the segments 1 adjacent to each other in the tunnel axis direction according to the present embodiment, for example, as shown in FIGS. 3 to 5, a structure in which a male member is inserted into a female member is used. it can.

  FIG. 3 is a longitudinal sectional view showing an example of an anchor type joint structure. This anchor-type joint structure is configured to insert a male member 30 made of a metal tube into a female member 32. The female member 32 includes an insertion hole 32a that serves as an insertion port for the male member 30, and a guide member 32b that is provided at the back of the insertion hole 32a and has an annular guide hole that increases in diameter toward the back. The male member 30 inserted into 32a is further deformed in diameter in the process of being inserted along the guide hole of the back guide member, so that the male member 30 is prevented from being detached from the female member 32.

  FIG. 4 is a longitudinal sectional view showing an example of a mechanical joint structure. In this mechanical joint structure, the male member 40 is composed of a metal tube 40a and a plurality of blades 40b that are provided on the outer periphery of the tip of the metal tube 40a and can be accommodated inside, while the female member 42 is The insertion hole 42a is an insertion port for the male member 40, and the engagement portion 42b is provided at the back of the insertion hole 42a. In the process in which the male member 40 passes through the insertion hole 42a of the female member 42, the blade plate 40b is housed inward, and when it passes through the insertion hole 42a, the blade plate 40b opens outward, and the blade plate 40b and the engaging portion 42b. And the male member 40 is prevented from being detached from the female member 42.

  FIG. 5 is a longitudinal sectional view showing an example of a press-fitting joint structure. In this press-fitting joint structure, the male member 50 is composed of a steel pipe 10 protruding so that a part of the male member 50 protrudes from the end of the segment 1, and the female member 52 serves as an insertion port for the male member 50. The part 52a and the cylindrical body 52c which has elasticity are provided in the outer periphery, and consist of the narrow part 52b by which the internal diameter was processed smaller than the outer diameter of the male member 50. That is, the male member 50 is guided through the insertion guide portion 52a of the female member 52, and is then inserted while pushing the narrow portion 52b. Therefore, the male member 50 is prevented from being detached from the female member 52 due to friction between the male member 50 and the narrow portion 52b of the deformed steel pipe 10.

  As mentioned above, according to these joint structures, since it has the structure where the connection of the segment 1 is not removed after connection, even if a tensile stress arises in a tunnel axial direction, segments do not remove. In addition, it is not necessary to use bolts or nuts for connection, and for example, it is possible to connect the segments 1 to each other using a reaction force by a shield jack, so that the efficiency of construction work can be improved.

It is an example of the structure of the segment which concerns on this embodiment, (a) is a cross-sectional view of the structure, (b) is an expanded view which meets the AA line of (a). It is a perspective view which shows an example of the shield lining body constructed | assembled by assembling the segment which concerns on this embodiment. It is a longitudinal section showing an example of an anchor type joint structure concerning this embodiment. It is a longitudinal cross-sectional view which shows the example of a joint structure of the mechanical system which concerns on this embodiment. It is a longitudinal cross-sectional view which shows the example of a joint structure of the press injection system which concerns on this embodiment. It is an example of the conventional general segment structure, (a) is a cross-sectional view of the structure, (b) is an expanded view along the BB line of (a).

Explanation of symbols

1 Segment 10 Steel Pipe 12 Joint 18 Steel Fiber Mixed Concrete 20 Mortise Structure 22 Shield Covering Body 24a, 24b Segment Ring a, b Joint

Claims (8)

A segment for shield lining,
A rigid member penetrating between both ends in the tunnel axis direction of the segment;
And a joint structure for connecting the rigid members of the segments adjacent to each other in the tunnel axis direction and provided at an end of the rigid member.   The segment for shielding lining according to claim 1, wherein the rigid member is a steel material.   The segment for shielding lining according to claim 1, wherein the base material is concrete mixed with steel fibers.   The segment for shielding lining according to claim 1, wherein a tenon structure that can be fitted to the adjacent segment in the tunnel circumferential direction is provided at an end of the segment in the tunnel circumferential direction.   A shield covering body using the segment according to claim 1, wherein the rigid members of segments adjacent to each other in the tunnel axial direction are connected by the joint structure. .   The segments are arranged in a staggered manner such that the positions of the junctions in the tunnel circumferential direction are different from the positions of the junctions in the tunnel circumferential direction in the segments adjacent in the tunnel axis direction. 6. The shield covering body according to claim 5, wherein the shield covering body is disposed so as to be disposed on the same straight line as a rigid member of a segment adjacent in the tunnel axis direction in a state where the staggered structure is disposed.   It is the construction method of the shield covering body using the segment of Claims 1-4, Comprising: The said rigid member of the segment adjacent to a tunnel axial direction is connected by the said joint structure, The shield covering How to build the body. The segments are arranged in a staggered manner such that the positions of the junctions in the circumferential direction of the tunnel are different from the positions of the junctions in the circumferential direction of the tunnel in the adjacent segment in the tunnel axial direction. 8. The method for constructing a shield lining body according to claim 7, wherein the shield lining body is arranged so as to be collinear with a rigid member of a segment adjacent in the tunnel axis direction in the staggered arrangement.

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