JP6037376B2 - Tunnel reinforcement structure - Google Patents

Tunnel reinforcement structure Download PDF

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JP6037376B2
JP6037376B2 JP2012147699A JP2012147699A JP6037376B2 JP 6037376 B2 JP6037376 B2 JP 6037376B2 JP 2012147699 A JP2012147699 A JP 2012147699A JP 2012147699 A JP2012147699 A JP 2012147699A JP 6037376 B2 JP6037376 B2 JP 6037376B2
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tunnel
reinforcing
panel
circumferential
axial
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JP2014009521A (en
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克秀 森本
克秀 森本
沼田 憲
憲 沼田
匡善 柴田
匡善 柴田
安井 啓祐
啓祐 安井
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株式会社奥村組
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  The present invention relates to a tunnel reinforcing structure that reinforces an inner wall surface of a tunnel.
  In tunnels for various uses, such as for roads, railways, and waterways, part of the inner wall surface may be peeled off or dropped due to aging, etc. Various measures are taken to secure safety, such as reinforcing a deteriorated portion.
  Examples of the tunnel reinforcement method include a method in which carbon fibers impregnated with resin are laminated on the inner wall surface of the tunnel, a method in which a steel plate is bonded to the inner wall surface of the tunnel, or the inner wall surface of the tunnel is formed of a plurality of plate-like shapes. A method of covering with a rigid panel (see, for example, Patent Documents 1 and 2) is known.
JP 2010-285844 A JP 2006-37471 A
  However, for example, in the reinforcement work of the inner wall surface of a railway tunnel, it is necessary to perform the work within a limited short time when the railway operation is suspended, and in the reinforcement work of the inner wall surface of a road tunnel, It is required to secure the necessary strength under severe conditions, such as the need to perform construction under regulations. For this reason, in a tunnel reinforcement structure, how to ensure high strength with a simple structure that can be easily and quickly assembled is an important issue.
  The present invention has been made from the above-described technical background, and an object thereof is to provide a technique capable of providing a tunnel reinforcing structure having a high strength with a simple structure that can be assembled easily and quickly. The purpose is to do.
In order to solve the above-described problem, the tunnel reinforcing structure according to the first aspect of the present invention is formed in a shape along the curved inner wall surface of the tunnel, and is divided along the circumferential direction and the axial direction of the tunnel. Provided so as to cover at least the upper half surface in the circumferential direction of the inner wall surface of the tunnel, with a plurality of unit reinforcing members, the unit reinforcing members adjacent in the circumferential direction of the tunnel being engaged with each other at the abutting portion A reinforcing member provided between the leg of the reinforcing member and the leg of the tunnel on both sides in the width direction of the tunnel, and a support member that supports the reinforcing member. The length along the circumferential direction of the tunnel is longer than the length along the axial direction of the tunnel, and the plurality of unit reinforcing members of the reinforcing body include the circumferential direction and the axis of the tunnel. The unit reinforcing members that are adjacent to each other in the direction are joined by being tightened by bolts that extend across the butted portions of the unit reinforcing members, and a male thread portion is formed at one end in the axial direction of the bolt. A large diameter portion is formed at the other axial end of the bolt so as to prevent rotation of the bolt, and a female screw portion into which the male screw portion is screwed is formed at the end surface of the large diameter portion. being, said bolt adjacent to each other in axial direction of the tunnel, the internal thread portion of the large diameter section of one of the bolt, and wherein Rukoto male screw portion of the other bolt is joined by being screwed To do.
The invention according to claim 2 is the invention according to claim 1, wherein the large-diameter portion is arranged in a state of protruding from the side surface in the width direction of the unit reinforcing member, and the width of the unit reinforcing member A hole for fitting the large diameter portion is formed on a side surface in the direction so as to prevent rotation of the bolt, and the unit reinforcing members adjacent to each other in the axial direction of the tunnel are The large diameter portions protruding from the side surfaces are joined to each other in a state of being fitted into the holes formed on the side surface of the other unit reinforcing member .
According to a third aspect of the present invention, in the first or second aspect of the present invention, the unit reinforcing members adjacent in the circumferential direction of the tunnel at the ceiling portion of the tunnel are in the axial direction of the tunnel at abutting portions with each other. It is characterized by being joined so as to mesh with each other in a shifted state.
According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, the unit reinforcing members adjacent in the axial direction of the tunnel are joined by the bolt for each unit reinforcing member. It is characterized by that.
According to a fifth aspect of the present invention, in the first or second aspect of the present invention, the unit reinforcing members adjacent to each other in the circumferential direction of the tunnel in the ceiling portion of the tunnel are at the abutting portions of the tunnel. In the ceiling portion of the tunnel, the abutting portions of the unit reinforcing members adjacent to each other in the circumferential direction of the tunnel become narrower toward each tip. In the ceiling portion of the tunnel, two bolts are arranged in parallel along the circumferential direction at the abutting portions of the unit reinforcing members adjacent in the circumferential direction of the tunnel. The unit reinforcing member adjacent to the tunnel in the ceiling portion of the tunnel is joined by the bolt every two unit reinforcing members. And wherein the Rukoto.
According to a sixth aspect of the present invention, in the unit reinforcing member of the ceiling portion of the tunnel according to the fifth aspect of the invention, the through hole through which the bolt passes has a length in the thickness direction of the unit reinforcing member. The length is longer than the circumferential length of the tunnel.
The invention according to claim 7 is the invention according to any one of claims 1 to 6 , wherein a surface of the unit reinforcing member facing the inner wall surface of the tunnel faces the inner wall surface of the tunnel. A protruding portion is provided, and the protruding portion is provided in a state extending along the circumferential direction of the tunnel.
According to an eighth aspect of the present invention, in the invention of the seventh aspect, the surface of the reinforcement body facing the inner wall surface of the tunnel is between the protrusions adjacent to each other along the axial direction of the tunnel. A water conduit is formed by the groove, and the water conduit is formed in a continuous state along the circumferential direction of the tunnel.
The invention according to claim 9 is the invention according to any one of claims 1 to 8 , wherein water is permeable between the opposing surfaces of the inner wall surface of the tunnel and the unit reinforcing member. A member is provided.
The invention described in claim 10 is characterized in that, in the invention described in any one of claims 1 to 9, a water stop member is provided at a joint portion between the unit reinforcing members.
The invention according to claim 11 is the invention according to any one of claims 1 to 10 , wherein the reinforcing body is attached to a ceiling from a leg portion of the tunnel by the support bodies on both sides in the width direction of the tunnel. And is supported in a state of being pressed against the inner wall surface of the tunnel.
The invention according to a twelfth aspect is the invention according to any one of the first to eleventh aspects, wherein the reinforcing body is divided at a ceiling portion of the tunnel in a circumferential direction of the tunnel, It is divided between a ceiling part and a leg part, and is composed of a total of four unit reinforcing members.
  According to the first aspect of the present invention, the reinforcing body is constituted by a plurality of unit reinforcing members, and the abutting portions of the unit reinforcing members adjacent in the circumferential direction of the tunnel are made to engage with each other. It is possible to provide a tunnel reinforcing structure having high strength with a simple structure possible.
According to the second aspect of the present invention, the relative positions of the unit reinforcing members adjacent to each other in the axial direction of the tunnel can be easily matched, so that the reinforcing plate can be easily and quickly assembled. Become.
According to the invention described in claim 3, since a series of assembling operations can be completed for each unit reinforcing member, it is possible to make it easy to finish.
According to the invention described in claim 4, since a series of assembling operations can be completed for each unit reinforcing member, it is possible to make it easy to finish.
In addition, according to the invention described in claim 5, since the lengths of the bolts can be unified, the assembling work of the reinforcing plate can be performed easily and quickly.
According to the sixth aspect of the present invention, the positioning accuracy in the thickness direction between the unit reinforcing members adjacent to each other in the axial direction of the tunnel can be relaxed. It becomes possible.
According to the seventh aspect of the present invention, the provision of the projecting portion makes it possible to improve the rigidity of the unit reinforcing member without significantly increasing the weight of the unit reinforcing member.
In addition, according to the eighth aspect of the invention, water leaking from the inner wall surface of the tunnel can be drained well, so that it is possible to prevent the leaked water from leaking to the surface of the reinforcing plate. .
Further, according to the ninth aspect of the present invention, the water leaked from the inner wall surface of the tunnel can be drained more favorably, so that the leaked water can be prevented from leaking to the surface of the reinforcing plate. Become.
Further, according to the invention described in claim 10, it is possible to prevent water leaking from the inner wall surface of the tunnel from leaking from the joint portion between the unit reinforcing members to the surface of the reinforcing plate.
According to the invention of claim 11 , it is possible to suppress or prevent the initial movement of the peeling of the inner wall portion of the tunnel.
According to the invention described in claim 12 , since each unit reinforcing member can be made small and light, it is possible to provide a tunnel reinforcing structure having high strength with a simple structure that can be easily and quickly assembled. It becomes possible.
It is a front view of the tunnel of repair object. It is a perspective view of the tunnel of FIG. It is a front view of a tunnel which shows an effect | action of the tunnel reinforcement structure when peeling does not generate | occur | produce in the inner wall face of the tunnel of FIG. It is a front view of a tunnel which shows the effect | action of a tunnel reinforcement structure when peeling has generate | occur | produced in the inner wall face of the tunnel of FIG. It is a principal part disassembled perspective view of the reinforcement board of the tunnel reinforcement structure of FIG. It is a front view of a tunnel which shows the case where the reinforcement board of a tunnel reinforcement structure is divided | segmented into right and left by the ceiling part of the circumferential direction of the inner wall of a tunnel. It is a front view of a tunnel which shows the case where the reinforcement board of a tunnel reinforcement structure is divided into 3 along the circumferential direction of the inner wall of a tunnel. It is a front view of a tunnel which shows the case where the reinforcement board of a tunnel reinforcement structure is divided into four by the ceiling part and the right-and-left side wall part of the circumferential direction of the inner wall of a tunnel. (A) is a top view of the panel of the upper half side, (b) is a top view of the panel of the lower half side. It is an expansion perspective view of the ceiling part of the reinforcement board of the tunnel reinforcement structure of FIG. It is a principal part expanded top view of the reinforcement board of the tunnel reinforcement structure of FIG. It is a principal part expanded top view of an example at the time of assembling the panel of the ceiling part of a tunnel with a potato assembly. It is a principal part perspective view of the reinforcement board which shows the panel junction part of the ceiling part of a tunnel. It is a principal part expanded top view of the reinforcement board of the tunnel reinforcement structure of FIG. (A) is the enlarged plan view which showed typically the panel junction part of the ceiling part of a tunnel, (b) is the enlarged plan view which showed typically the panel junction part of the side wall part of a tunnel. It is sectional drawing of the panel junction part of FIG. It is a principal part perspective view of the volt | bolt which connects panels. (A) is the principal part side view of the panel in which the through-hole in which a volt | bolt is inserted in the panel was formed, (b) is the principal part side view of the panel in which the fixed through-hole of the opposite surface of (a) was formed. . It is a partially broken principal part perspective view which shows the back side of a panel. (A), (b) is a side view of the width side of a panel. It is a side view of the width side of the modification of a panel. It is a front view of the tunnel for demonstrating the other effect | action of the rib of a panel. It is a side view of the width side of the panel adjacent to the axial direction of a tunnel. (A) is the side view which expanded and showed the panel junction part of FIG. 23, (b) is the side view of the butt | matching part side of the panel adjacent to the circumferential direction of a tunnel. It is a front view of the support part arrange | positioned with respect to the panel for one sheet of a lower half side. It is sectional drawing of the II line of the support part of FIG. It is sectional drawing of the modification of the support part which supports a reinforcement board. It is a flowchart which shows an example of the assembly method of a tunnel reinforcement structure. It is a front view of the tunnel during the assembly work of a tunnel reinforcement structure. FIG. 30 is a front view of the tunnel during the assembly work of the tunnel reinforcement structure following FIG. 29. FIG. 31 is a front view of the tunnel during the assembly work of the tunnel reinforcement structure following FIG. 30. FIG. 32 is a front view of the tunnel during the assembly work of the tunnel reinforcing structure following FIG. 31. FIG. 33 is a front view of the tunnel during the assembly work of the tunnel reinforcement structure following FIG. 32. FIG. 34 is a front view of the tunnel during the assembly work of the tunnel reinforcement structure following FIG. 33. It is the enlarged plan view which showed typically the panel junction part of the ceiling part of a tunnel reinforcement structure. (A) is the principal part side view of the panel which shows the through-hole in which the bolt for joining panels is inserted, (b) is on the surface side on the opposite side to the insertion surface of the bolt for joining panels. It is a principal part side view of the panel which shows the formed fixed through-hole.
  Hereinafter, an embodiment as an example of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment, and the repetitive description thereof will be omitted.
  (First embodiment)
  FIG. 1 is a front view of a tunnel 1 to be repaired, and FIG. 2 is a perspective view of the tunnel 1 of FIG.
  The tunnel 1 is, for example, a railway tunnel, and is formed by stacking a plurality of bricks 1 a along the radial direction of the tunnel 1. The number of bricks 1a stacked is, for example, 4 layers, and the total thickness D1 is, for example, 455 mm. For example, the bricks 1a are stacked so that the longitudinal direction of the bricks 1a is arranged along the axial direction (line direction) of the tunnel 1. Each brick 1a has a size of, for example, 210 mm × 100 mm × 60 mm.
  The inner wall surface of the tunnel 1 is formed in a curved shape such as a horseshoe shape when viewed from the front. The inner height H1 of the tunnel 1 is, for example, 5.06 m, the lower half-height H2 is, for example, 2.80 m, the inner-half height H3 is, for example, 2.28 m, and the inner radius. R1 is 2.28 m, for example, and the inner width W1 is 4.56 m, for example.
  An overhead line EA is installed along the axial direction of the tunnel 1 near the ceiling in the interior of the tunnel 1. Further, a signal high voltage line EH and a signal low voltage line EL are installed along the axial direction of the tunnel 1 slightly above the center on the left and right side wall surfaces of the tunnel 1.
  In such a tunnel 1, a tunnel reinforcement structure 2 is installed along the curved inner wall surface of the tunnel 1 so as to cover almost the entire area in the circumferential direction of the inner wall of the tunnel 1. The tunnel reinforcing structure 2 is a structure that repairs and reinforces the inner wall surface of the tunnel 1, and includes a reinforcing plate (reinforcing body) 3 that covers the inner wall surface of the tunnel 1, legs of the reinforcing plate 3, and the tunnel 1. A support portion (support body) 4 that is provided between the leg portions and supports the reinforcing plate 3 is provided.
  The reinforcing plate 3 of the tunnel reinforcing structure 2 is pushed up in the direction from the legs of the tunnel 1 toward the ceiling by the support portions 4 and 4 on both sides in the width direction of the tunnel 1, and the back surface of the reinforcing plate 3 is the inner wall surface of the tunnel 1. It is supported in a state where it touches and is pressed. That is, in the present embodiment, by applying an internal pressure from the reinforcing plate 3 of the tunnel reinforcing structure 2 to the brick surface of the inner wall of the tunnel 1, it is possible to suppress or prevent the initial movement of the brick 1a from peeling off. Yes.
  Next, FIG. 3 shows the operation of the tunnel reinforcement structure 2 when peeling does not occur on the inner wall surface of the tunnel 1. A force P1 indicates a force that pushes the reinforcing plate 3 upward, and a force P2 indicates a force that the reinforcing plate 3 presses the inner wall surface of the tunnel 1. A force P2 from the reinforcing plate 3 is applied almost evenly to the inner wall surface of the tunnel 1. Thereby, peeling of the brick 1a can be suppressed or prevented as described above.
  In this embodiment, since the reinforcing plate 3 of the tunnel reinforcing structure 2 is pressed against the inner wall surface of the tunnel 1, the area occupied by the reinforcing plate 3 in the inner space section of the tunnel 1 is minimized. Can do. For this reason, the obstruction amount of the internal space cross section of the tunnel 1 by the reinforcement board 3 can be made small.
  Furthermore, in the present embodiment, since the tunnel reinforcing structure 2 is provided so as to cover the inner wall surface of the tunnel 1, deterioration due to corrosion, weathering, or the like of the inner wall surface of the tunnel 1 can be suppressed or prevented. . For this reason, the occurrence of peeling of the inner wall surface of the tunnel 1 can be reduced or prevented.
  Next, FIG. 4 shows the operation of the tunnel reinforcing structure 2 when peeling occurs on the inner wall surface of the tunnel 1. In this case, the drop force P3 of the peeled material M acts on the reinforcing plate 3. The dropping force P3 of the peeled material M applies a downward load to both end portions (leg portions) of the reinforcing plate 3, but the elastic force is generated in the reinforcing plate 3 by the dropping force P3. A repulsive force P4 that attempts to restore the distortion is generated in a direction in which the inner wall surface of the tunnel 1 is pressed. As a result, the falling matter M is held between the reinforcing plate 3 and the inner wall surface of the tunnel 1 in a state where the dropping force P3 of the falling matter M is dispersed by the reinforcing plate 3. This effect is the same when peeling occurs on the side wall surface of the inner wall of the tunnel 1.
  Next, FIG. 5 is an exploded perspective view of a main part of the reinforcing plate 3 of the tunnel reinforcing structure 2.
  The reinforcing plate 3 is constituted by a plurality of panels 3u (3u1, 3u2, 3u3, 3u4: unit reinforcing members) divided along the circumferential direction and the axial direction of the tunnel 1. Each panel 3u is formed in a curved shape along the curved inner wall surface of the tunnel 1.
  Since the reinforcing plate 3 is composed of the plurality of panels 3u in this way, the stress applied to the reinforcing plate 3 can be effectively dispersed, so that the resistance of the reinforcing plate 3 can be improved.
  Further, since the weight of each panel 3u can be reduced by configuring the reinforcing plate 3 with a plurality of panels 3u, it is reinforced by a small number of workers, for example, about two people without using a large machine or supporting member. The plate 3 can be assembled easily and quickly.
  Here, the ceiling-side panels 3u1 and 3u2 on the inner wall surface of the tunnel 1 are formed with the same size and shape, and the side-wall side panels 3u3 and 3u4 on the inner wall surface of the tunnel 1 are formed with the same size and shape. . Thus, since the panel 3u can be mass-produced by making the size and shape of the panel 3u the same, the cost of the reinforcing plate 3 can be reduced.
  Here, the reinforcing plate 3 is divided into, for example, four along the circumferential direction of the tunnel 1. The reason will be described with reference to FIGS. 6-8, S shows the division | segmentation location of the reinforcement board 3, and X, Y has shown the centerline.
  FIG. 6 shows a case where the reinforcing plate 3 is divided into left and right at the ceiling in the circumferential direction of the tunnel 1. In this case, the maximum length of the panel 3u is, for example, 6.5 m, and the weight of the panel (kg / 0.5 m width) is, for example, 83 kg, which is difficult to assemble the reinforcing plate 3 with a small number of workers. The signal high voltage line EH and the signal low voltage line EL (see FIG. 1) cannot be avoided.
  FIG. 7 shows a case where the reinforcing plate 3 is divided into three in the circumferential direction of the tunnel 1 (θ = 120 degrees). In this case, the maximum length of the panel 3u is 4.7 m, for example, and the weight (kg / 0.5 m width) of the panel 3u is 60 kg, which is the same problem as in FIG. However, when there is no overhead wire EA, signal high voltage line EH, and signal low voltage line EL, the panel 3u may be temporarily assembled and the reinforcing plate 3 may be installed so as to project in the circumferential direction of the tunnel 1.
  FIG. 8 shows a case where the reinforcing plate 3 is divided into four at the ceiling portion and the left and right side wall portions in the circumferential direction of the tunnel 1 as in the present embodiment. In this case, the maximum length of the panel 3u is, for example, 3.6 m, and the weight (kg / 0.5 m width) is, for example, 46 kg. In this case, even if there is an overhead wire EA, a signal high voltage line EH, and a signal low voltage line EL, they can be assembled while avoiding them, and are reinforced by a small number of workers of about two people without using a large machine or a supporting member. The plate 3 can be assembled.
  9A is a plan view of the upper half panel 3u (3u1, 3u2), and FIG. 9B is a plan view of the lower half panel 3u (3u3, 3u4).
  The upper half side and lower half side panels 3u are formed of, for example, a fiber reinforced plastic (hereinafter referred to as FRP) plate mainly composed of glass fiber, unsaturated polyester resin, and aluminum hydroxide. FRP has a high bending strength, is relatively lightweight, and has a high dimensional accuracy in manufacturing, and is suitable for a repairman.
The panel 3u has a weight of, for example, 17 kN / m 3 , a Young's modulus of, for example, 9.6 to 13.0 kN / mm 2 , a bending strength of, for example, 130 N / mm 2 , a flexure of, for example, 38.3 mm, and a stress degree σ of For example, 31.2 N / mm 2 and the allowable stress σ 3 are, for example, 65.0 N / mm 2 (σ ≦ σ 3). The panel 3u is nonflammable (heat resistance test JIS K 6911), has a thermal conductivity of, for example, 0.19 to 0.24 (W / m · ° C.), and is non-conductive (dielectric strength 300 to 450V / mill).
  Examples of panel materials include ultra-high-strength fiber reinforced concrete boards (main components are, for example, dedicated fibers (steel fibers, polyvinyl alcohol fibers), silica fume and silica powder), and high toughness cement boards (main components are, for example, polyvinyl chloride). Alcohol fibers, silica fume and sepiolite) may be applied.
  As shown in FIG. 9A, the length L1 of the upper half panel 3u (3u1, 3u2) is, for example, 3.766 m, and the width W2 is, for example, 0.5 m. Further, as shown in FIG. 9B, the length L2 of the lower half panel 3u (3u3, 3u4) is, for example, 2.846 m, and the width W3 is the same as that of the upper half panel 3u, for example, 0.5 m. It is.
  Each panel 3u is formed such that the lengths L1 and L2 along the circumferential direction of the tunnel 1 are longer than the lengths (widths W2 and W3) along the axial direction of the tunnel 1. This is for the following reason, for example.
  If the circumferential length of the tunnel 1 in the panel 3u is shorter than the axial length, the panel 3u becomes smaller and the workability at the time of assembling the reinforcing plate 3 is improved. Therefore, the joining work between the panels 3u becomes troublesome and time-consuming work.
  Further, in the present embodiment, as described above, a force that presses the reinforcing plate 3 against the inner wall of the tunnel 1 is applied, and the peeled object M is supported by the elastic action of the reinforcing plate 3. When the number of joints of the panel 3u increases along the direction, the strength of the reinforcing plate 3 decreases.
  On the other hand, as in the present embodiment, in the panel 3u, the circumferential length L1 of the tunnel 1 is made longer than the axial length (widths W2, W2), so that the circumferential direction of the tunnel 1 is increased. The joint location of the panel 3u can be reduced significantly. For this reason, the assembly work of the reinforcement board 3 can be performed simply and rapidly. Further, the strength of the reinforcing plate 3 can be improved.
  Next, FIG. 10 is an enlarged perspective view of the ceiling portion of the reinforcing plate 3 of the tunnel reinforcing structure 2, and FIG. 11 is a plan view showing an unfolded main portion of the reinforcing plate 3 of the tunnel reinforcing structure 2. . The horizontal direction in FIG. 11 is the circumferential direction of the tunnel 1.
  The panels 3u adjacent to each other in the circumferential direction of the tunnel 1 are joined so as to mesh with each other at the butted portions. In the ceiling part of the tunnel 1, the panels 3u1 and 3u2 are assembled in a so-called staggered pattern. That is, the panels 3u1 and 3u2 are joined so as to mesh with each other in a state where they are shifted by a half width of the panels 3u1 and 3u2 in the axial direction of the tunnel 1 at the abutting portions.
  Further, the panels 3u1, 3u3 and the panels 3u2, 3u4 are each assembled in a so-called potato assembly in the side wall portion in the tunnel 1. That is, the panels 3u1, 3u3 and the panels 3u2, 3u4 are joined so as to mesh with each other in a state where they do not deviate in the axial direction of the tunnel 1 at the respective butted portions.
  Thus, since the strength at the joined portion of the panel 3u can be increased by meshing and joining the panel 3u, the rigidity of the reinforcing plate 3 can be improved.
  Further, by engaging and joining the unevenness of the panels 3u, 3u adjacent to each other in the circumferential direction of the tunnel 1 to improve the alignment accuracy between the panels 3u (the circumferential direction and axial position of the tunnel 1). Can do. That is, as compared with the case where the panels 3u, 3u are joined without overlapping each other, such as a part of the panels 3u, 3u being overlapped and joined, or the panels 3u, 3u are joined by other members. The alignment work of the panels 3u at the joint can be facilitated. Therefore, the panel 3u can be assembled easily and quickly.
  Moreover, since the number of parts can be reduced compared with the case where panels 3u are joined by another member, the assembly operation time of the reinforcement board 3 can be shortened, and the cost of the reinforcement board 3 can be reduced.
  Further, since the panels 3u1 and 3u2 are staggered, as will be described later, one cycle of assembly work is performed for each panel 3u (for each of the upper and lower panels 3u and 3u on one side of the inner wall of the tunnel 1). You can make it easier to put up. Therefore, even when the allowable time for repair work is short, it can be flexibly dealt with.
  However, the panels 3u1 and 3u2 on the ceiling portion of the tunnel 1 may be assembled in a set. FIG. 12 is a plan view showing an unfolded main portion of an example when the panels 3u1 and 3u2 of the ceiling portion of the tunnel 1 are assembled in the potato assembly. The horizontal direction in FIG. 12 is the circumferential direction of the tunnel 1.
  The panels 3u5, 3u6 (3u) are joined to each other at the abutting portion of the ceiling 1 in the tunnel 1 so as to mesh with each other without shifting in the axial direction of the tunnel 1. Also in this case, the effect of engaging the panel 3u can be obtained.
  Next, FIG. 13 is a main part perspective view of the reinforcing plate 3 showing the panel joint portion of the ceiling portion of the tunnel 1, and FIG. 14 is a main part development plan view of the reinforcing plate 3.
  The panels 3u adjacent to each other in the circumferential direction of the tunnel 1 are joined by, for example, two bolts 5 at a mutual abutting portion (meshing portion). The method of connecting the bolts 5 is, for example, a longitudinal direction connection capable of obtaining high rigidity at the panel joint. That is, two through holes extending along the axial direction of the tunnel 1 are formed on the side surface of the meshing portion of the panel 3u, and the bolt 5 is inserted into each through hole and screwed to the panel. 3u are joined together. Thereby, the effect by the meshing joining of the panels 3u can be expected, and high rigidity can be obtained at the panel joining portion.
  Next, FIG. 15A is an enlarged plan view schematically showing the panel joint portion of the ceiling portion of the tunnel 1, and FIG. 15B schematically shows the panel joint portion of the side wall portion of the tunnel 1. FIG. 16 is a cross-sectional view of the panel joint, FIG. 17 is a perspective view of the main part of the bolt 5 for joining the panel 3u, and FIG. 18 (a) shows the through hole 6a into which the bolt 5 is inserted in the panel 3u. The principal part side view of the formed panel 3u, FIG.18 (b) is a principal part side view of the panel 3u in which the fixed through-hole 6b of the opposite surface of the figure (a) was formed.
  First, as shown in FIGS. 15A and 15B, the panel 3 u is joined to each panel 3 u by a bolt 5 at the ceiling and side walls of the reinforcing plate 3.
  As shown in FIGS. 15 and 16, a male screw portion 5 a is formed at one end of the bolt 5. Moreover, as shown in FIGS. 15-17, the large diameter part 5b whose diameter is larger than another part is formed in the other end of the volt | bolt 5, and the other end face of the large diameter part 5b has other A female screw portion 5c for screwing the male screw portion 5a of the bolt 5 is formed. The shape of the end face of the large-diameter portion 5b is formed, for example, in a substantially bowl shape so that the rotation of the bolt 5 is suppressed as shown in FIG.
  Moreover, as shown to Fig.18 (a), the through-hole 6a for inserting the volt | bolt 5 is formed in the side surface in which the volt | bolt 5 is inserted in the panel 3u. The shape of the through-hole 6a is formed in a circular shape, and the diameter thereof is formed to be larger than the diameter of the male screw portion 5a of the bolt 5.
  On the other hand, as shown in FIG. 18B, a fixed through hole 6b larger than the through hole 6a is aligned with the central axis of the through hole 6a on the side surface opposite to the surface into which the bolt 5 is inserted in the panel 3u. It is formed in the state made to do.
  The fixed through hole 6b is a hole into which the large diameter portion 5b of the bolt 5 is fitted. The size and planar shape of the fixed through hole 6b are substantially larger than the large diameter portion 5b so that the large diameter portion 5b of the bolt 5 can be fitted and the rotation of the bolt 5 can be stopped. Is formed.
  The panels 3u and 3u are joined together by inserting the male screw part 5a at one end of the bolt 5 into the through hole 6a of the panel 3u and screwing it into the female screw part 5c of the large diameter part 5b of another bolt 5 that has already been fixed. To do.
  Next, FIG. 19 is a partially broken perspective view showing the back side of the panel 3u, FIGS. 20A and 20B are side views of the width side of the panel 3u, and FIG. 21 is a deformation of the panel 3u. FIG. 22 is a front view of the tunnel 1 for explaining another function of the rib 3ur of the panel 3u.
  First, as shown in FIGS. 19 and 20, on the back surface of the panel 3u facing the inner wall surface of the tunnel 1, a plurality of ribs projecting in the thickness direction of the panel 3u (direction toward the inner wall surface of the tunnel 1) ( (Projecting part) 3ur is provided.
  A plurality of ribs 3ur are provided at predetermined intervals along the width direction of the panel 3u (the axial direction of the tunnel 1). Each rib 3ur is formed in a state of extending continuously from end to end in the longitudinal direction of the panel 3u (circumferential direction of the tunnel 1).
  As shown in FIG. 20A, the width W4 of each rib 3ur is, for example, 20 mm. The total thickness D2 of the height of the rib 3ur and the thickness of the panel 3u is set to be 20 mm or less, for example. Thereby, 20 mm of the inner space inhibition amount of the tunnel 1 can be protected. The height of the rib 3ur and the thickness of the panel 3u are both 10 mm, for example.
  By providing such a rib 3ur, the following effects can be obtained.
  Since the rigidity of the panel 3u can be increased and tension can be applied to the panel 3u, the self-supporting property of the panel 3u can be improved while the panel 3u remains thin. For this reason, the tolerance of the panel 3u with respect to peeling of the brick 1a can be improved.
  Moreover, when performing panel construction at the time of repairing the inner wall surface of the tunnel 1, generally, the side wall portion of the inner wall surface of the tunnel 1 is hung and a vertical support is installed there. For this reason, work takes time and time. On the other hand, in the present embodiment, the panel 3u has high rigidity and can be self-supporting. Therefore, when repairing the inner wall surface of the tunnel 1, the side wall surface of the inner wall of the tunnel 1 is held and a vertical support is installed there. It is not necessary to use this method. For this reason, repair work of the inner wall surface of the tunnel 1 can be performed easily and quickly, and the cost can be reduced.
  Further, since the rib 3ur is provided, the rigidity can be increased without increasing the thickness of the panel 3u, and therefore the rigidity of the panel 3u can be improved without significantly increasing the weight of the panel 3u. For this reason, the reinforcing plate 3 can be assembled even by a small number of workers such as two.
  Further, if the rigidity of the panel 3u is low, the panel 3u is twisted or warped when the panel 3u is assembled, so that it is necessary to carefully perform the assembling work, and it becomes difficult to handle the panel 3u. In contrast, in the present embodiment, the panel 3u is provided with the rib 3ur, so that deformation such as warpage or twisting of the panel 3u can be prevented. For this reason, the panel 3u can be easily handled when the panel 3u is assembled.
  Furthermore, the strength of the reinforcing plate 3 can be improved by matching the positions of the plurality of ribs 3ur on the back surface of each panel 3u adjacent in the circumferential direction of the tunnel 1 (position in the width direction of the panel 3u).
  Further, when the cross-sectional rigidity of the panel 3u is insufficient, as shown in FIG. 21, a rib 3urh that is taller than the rib 3ur may be provided on the back surface of the panel 3u. Thereby, the rigidity of the panel 3u can be improved.
  Here, the tall rib 3urh is provided in the center of the panel 3u in the width direction. The width of the rib 3urh is, for example, about 10 mm narrower than the rib 3ur. The other configuration of the rib 3urh is the same as that of the rib 3ur. However, when using the panel 3u provided with the tall rib 3urh, a groove is formed in the inner wall surface of the tunnel 1 so that the tall rib 3urh is accommodated in the groove.
  Further, as shown in FIGS. 19, 20, and 22, a water conduit that guides water leaking in the tunnel 1 to the leg side of the tunnel 1 by the grooves 3 t between the adjacent ribs 3 ur on the back surface of the panel 3 u. Is formed. The water conduit by the groove 3t is provided in a continuous state along the circumferential direction of the tunnel 1. However, it suffices if the water conduits are provided continuously along the circumferential direction of the tunnel 1, and the width direction positions of the plurality of ribs 3 ur on the back surface of each panel 3 u adjacent to the circumferential direction of the tunnel 1 are not matched. May be.
  As described above, the groove 3t between the adjacent ribs 3ur on the back surface of the panel 3u is used as a water conduit, so that the water leaked from the inner wall surface of the tunnel 1 is removed from the groove 3t between the ribs 3ur as shown by arrows in FIG. It can flow to the leg side of the tunnel 1 through. Thereby, it can prevent that the water which leaked from the inner wall face of the tunnel 1 leaks to the surface of the reinforcement board 3 through a panel junction part.
  Further, a water-permeable member (not shown) having water permeability may be interposed between the opposing surfaces of the back surface of the panel 3 u and the inner wall surface of the tunnel 1. Thereby, since the drainage of the water leaked from the inner wall surface of the tunnel 1 can be further improved, it is prevented that the water leaked from the inner wall surface of the tunnel 1 leaks to the surface of the reinforcing plate 3 through the panel joint portion. Can do.
  This water-permeable member may be composed of a porous body formed by forming a three-dimensional network by mutually fusing the contacts of thin threads made of plastic such as polypropylene, or may be composed of a nonwoven fabric. . Such a porous body or nonwoven fabric is lightweight and has good workability. Moreover, since a porous body and a nonwoven fabric function also as a buffer member with respect to peeling of the brick 1a, the tolerance of the reinforcement board 3 with respect to peeling of the brick 1a can be improved.
  Next, FIG. 23 is a side view of the width side of the panel 3u adjacent in the axial direction of the tunnel 1, FIG. 24A is an enlarged side view showing the panel joint portion of FIG. 23, and FIG. ) Is a side view of the butted portion side of the panel 3u adjacent in the circumferential direction of the tunnel 1. FIG.
  As shown in FIGS. 23 and 24 (a), the panels 3u adjacent to each other in the axial direction of the tunnel 1 are joined together by fitting the convex portion 8b of the other panel 3u into the concave portion 8a of the one panel 3u. ing.
  Further, as shown in FIG. 24B, the convex portion 9b of the other panel 3u is fitted into the concave portion 9a of one panel 3u also at the abutting portion of the panel 3u adjacent in the circumferential direction of the tunnel 1.
  Further, as shown in FIGS. 24A and 24B, a water stop member 10 such as a water expansion rubber is provided at a joint portion between the panels 3u and 3u.
  Thus, by making the joint part of the adjacent panel 3u into a fitting structure, the mistaking of the panels 3u can be prevented. Moreover, the water-stop at the junction part of the panel 3u can be improved by making the junction part of the adjacent panel 3u into the fitting structure, and providing the water stop member 10 in the junction part. Thereby, it can prevent that the water which leaked from the inner wall face of the tunnel 1 leaks to the surface of the reinforcement board 3 through a panel junction part.
  Next, FIG. 25 is a front view of the support portion 4 arranged with respect to one panel 3u on the lower half side, and FIG. 26 is a cross-sectional view taken along line II of the support portion 4 of FIG. .
  The support part 4 is installed between the lower end surface of the lower half panel 3 u and the foundation concrete part 15. For example, two bolts 4a are disposed on the support portion 4 of one panel 3u.
  One end portion of each bolt 4a is inserted into a hole 16 drilled in the lower end surface of the lower half panel 3u, and the other end portion is fixed to the foundation concrete portion 15 side via a pedestal portion 4b. The hole 16 into which one end of each bolt 4a is inserted extends along the longitudinal direction of the panel 3u (circumferential direction of the tunnel 1) from the lower end surface of the panel 3u, and is terminated at an intermediate position in the longitudinal direction of the panel 3u. .
  A nut 4c is screwed to a midway position in the longitudinal direction of each bolt 4a. The height of the lower end surface of the panel 3u is adjusted (fixed) by the nut 4c. A load distribution member 4d is interposed between the lower end surface of the panel 3u and the nut 4c.
  Such bolts 4a, pedestals 4b, nuts 4c, and load distribution members 4d are covered and firmly fixed by a filling member 4e made of, for example, non-shrink mortar.
  Next, FIG. 27 is a cross-sectional view of a modified example of the support portion 4 that supports the reinforcing plate 3. Note that the symbol C indicates a hanging surface.
  Here, the case where the water channel 17 is embed | buried under the leg part of the panel 3u of the lower half side is shown. When the brick 1a on the inner wall surface of the tunnel 1 is peeled off, a load due to the peeling is applied to the leg portion of the reinforcing plate 3, so that it is preferable that the water channel 17 is not provided directly below the leg portion of the reinforcing plate 3.
  Therefore, only a part of the brick 1a on the inner wall surface of the leg portion of the tunnel 1 is hung so that the leg portion of the panel 3u is disposed there. Thereby, the position of the leg part of the panel 3u is shifted to the natural mountain side rather than the water channel 17.
  Next, an example of a method for assembling the tunnel reinforcing structure 2 will be described with reference to FIGS. 29 to 34 along the flowchart of FIG. 29 to 34 are front views of the tunnel 1 during the assembly work of the tunnel reinforcing structure 2. The work condition of the repair work for the inner wall surface of the tunnel 1 is, for example, night work and the actual work time is about 3 hours.
  First, in the preliminary construction 100 of FIG. 28, for example, three-dimensional surveying and foundation concrete placing work are performed.
  In the 3D survey, in order to confirm how much the current interior sky shape and design of the tunnel 1 are different, a 3D laser scanner is used to survey with a non-prism, and 3D CAD data is created from the results. Then, the shape of the inner wall of the tunnel 1 in an arbitrary cross section is grasped.
  In the foundation concrete placing work, the foundation concrete portion 15 (see FIG. 26 and the like) is placed in order to adjust the installation height of the panel 3u on the lower half side and secure a supporting force.
  Next, in the upper half panel installation step 101 in FIG. 28, the left upper half panel 3u is rotated from the position of the lower half side wall of the inner wall of the tunnel 1 along the curved inner wall surface as shown in FIG. Lift it up and place it at the approximate position. Then, the support 21a is taken out from the work table 20, and the left upper half panel 3u is temporarily received. Next, as shown in FIG. 30, the right upper half panel 3u is lifted in the same manner as the left side, and the right upper half panel 3u is provisionally received by the support 21b.
  The left and right upper half panels 3u are divided as described above, and the weight of one sheet is as light as, for example, about 45 kg, and a plurality of ribs 3ur on the back ensure high rigidity, so that it is easy to handle. Further, when installing the panel 3u, the panel 3u can be lifted while being rotated along the curved inner wall surface of the tunnel 1. Accordingly, the left and right upper half panels 3u can be installed relatively easily and quickly by a small number of workers, such as two.
  Next, in the lower half panel installation step 102 of FIG. 28, as shown in FIG. 31, after a temporary placement stand (not shown) is placed on the foundation concrete portion 15, the left side panel is placed on the stand. Temporarily place the lower panel 3u. Subsequently, the upper and lower half panels 3u and 3u on the left side are connected by bolts 5 (see FIG. 14, FIG. 15B, etc.). Next, as shown in FIG. 32, the lower half panel 3u on the right side is temporarily placed on a base on the foundation concrete portion 15 in the same manner as the left side, and the upper and lower half panels 3u and 3u are connected with bolts 5. To do.
  The left and right lower half panels 3u are also divided as described above, and the weight of one sheet is as light as, for example, about 40 kg, and a plurality of ribs 3ur are secured on the back side, so it is easy to handle. The lower half panel 3u can also be installed relatively easily and quickly by a small number of workers of about two.
  Next, in the jack-up process 103 of FIG. 28, as shown in FIGS. 33 and 34, between the lower ends of the left and right lower half panels 3u and the foundation concrete portion 15, for example, two per panel 3u. After the elevating means such as the jack 22 is installed, the left and right upper and lower half panels 3u are pushed up by the jack 22 until the ribs 3ur on the back surfaces of the left and right upper and lower half panels 3u are in contact with the inner wall surface (brick surface) of the tunnel 1. .
  Here, the jack-up position may be set at a substantially central position in the height direction of the tunnel 1 (position of the height H2 in FIG. 1). In that case, since the weight of the panel 3u and the direction of the jack-up force are on the same line, there is an effect that it is easy to transmit the force. However, in that case, since the jack-up position is high, it is difficult to check at the time of management after the reinforcing plate 3 is assembled. On the other hand, in the present embodiment, since the jack-up position is on the leg portion of the panel 3u, the inspection at the time of management after the reinforcement plate 3 is assembled can be facilitated.
  28, the bolts 5 (see FIG. 13, FIG. 15 (a), etc.) are inserted into the through holes 6a (see FIG. 18 etc.) in the meshing portions of the left and right upper half panels 3u, 3u. ) In the longitudinal direction and screwed to join the left and right upper half panels 3u, 3u.
  At this time, since the left and right upper half panels 3u adjacent to the tunnel 1 in the axial direction are pressed against the inner wall surface of the tunnel 1, the positions of the left and right upper half panels 3u and 3u in the thickness direction are determined. Can be matched. For this reason, the positions of the through holes 6a in the thickness direction of the left and right upper half panels 3u, 3u can also be matched. Therefore, the upper half side panels 3u, 3u adjacent in the axial direction of the tunnel 1 can be easily aligned, so that the assembling work of the reinforcing plate 3 can be performed easily and quickly.
  Subsequently, by replacing the jack 22 with a bolt 4a (see FIG. 25), the positions of the four panels 3u on the left, right, top and bottom assembled along the circumferential direction of the tunnel 1 are fixed.
  The reinforcing plate 3 is assembled on the inner wall of the tunnel 1 by repeating such steps 101 to 104 along the axial direction of the tunnel 1.
  In the present embodiment, since the combination of the panels 3u on the ceiling side of the tunnel 1 is a staggered group, one cycle of work is completed for each panel 3u (upper and lower half panels 3u, 3u). Because it can, you can make it easier to put a conclusion. Therefore, even when the allowable time for repair work is short, it can be flexibly dealt with.
  Further, since the reinforcing plate 3 is divided into a plurality of panels 3u, it is possible to assemble the reinforcing plate 3 while avoiding the overhead line EA, the signal high voltage line EH, the signal low voltage line EL, etc. installed near the inner wall surface of the tunnel 1. it can.
  Then, in the mortar filling step 105 in FIG. 28, after assembling a mortar filling mold on the legs of the reinforcing plate 3, for example, a premix type non-shrink mortar and water were mixed in the mold. By filling and blowing the object with air, the filling member 4e (see FIG. 24, etc.) is filled into the mold. Although the filling process of the filling member 4e is not specifically limited, For example, it is 5-10 m (1 time).
  At a later date, the mold for mortar filling is removed to form the support portion 4, and the assembly of the tunnel reinforcing structure 2 (see FIGS. 1 and 2 etc.) is completed.
  (Second Embodiment)
  FIG. 35 is an enlarged plan view schematically showing the panel joint portion of the ceiling portion of the tunnel reinforcing structure 2 according to the second embodiment.
  In the present embodiment, when the panels 3u in the ceiling portion of the tunnel 1 are joined together, the two panels 3u are joined with the bolts 5.
  In this case, the lengths of the two bolts 5 at the joint portion of the panel 3u can be unified. That is, all the bolts 5 used for joining the upper and lower panels 3u of the reinforcing plate 3 can be made the same.
  For this reason, it is possible to eliminate the trouble of aligning the lengths of the bolts 5 when assembling the reinforcing plate 3 and selecting the bolts 5 used in each joining operation. Can be assembled. Moreover, since the bolt 5 can be mass-produced, the cost of the tunnel reinforcing structure 2 can be reduced.
  (Third embodiment)
  36 (a) is a side view of the main part of the panel 3u showing the through hole 6a into which the bolt 5 for joining the panels 3u is inserted, and FIG. 36 (b) is a diagram of the bolt 5 for joining the panels 3u to each other. It is a principal part side view of the panel 3u which shows the fixed through-hole 6b formed in the surface side on the opposite side to an insertion surface.
  In the present embodiment, the shape of the through hole 6a into which the bolt 5 is inserted in the panel 3u is formed vertically long. That is, in the through hole 6a, the length (diameter) of the panel 3u in the thickness direction is longer than the length (diameter) of the panel 3u in the longitudinal direction (circumferential direction of the tunnel 1).
  Thereby, the alignment precision of the thickness direction of the panels 3u adjacent to the axial direction (the width direction of the panel 3u) of the tunnel 1 can be eased. For this reason, when the panels 3u adjacent to each other in the axial direction of the tunnel 1 are joined to each other, the bolts 5 can be inserted into the through holes 6a even if the positions of the panels 3u in the thickness direction are slightly shifted. The panels 3u to be joined can be joined. Therefore, the assembling work of the reinforcing plate 3 can be performed easily and quickly.
  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the embodiment disclosed in this specification is an example in all respects and is limited to the disclosed technology. It should be considered not a thing. That is, the technical scope of the present invention should not be construed restrictively based on the description in the above-described embodiment, but should be construed according to the description of the scope of claims. All modifications are included without departing from the technical scope equivalent to the described technique and the gist of the claims.
  For example, in the above-described embodiment, the case where the reinforcing plate is provided so as to cover almost the entire circumference of the inner wall of the tunnel has been described. However, the reinforcing plate of the tunnel reinforcing structure is at least in the circumferential direction of the inner wall surface of the tunnel. What is necessary is just to be provided so that a half surface may be covered. When a reinforcing plate is provided so as to cover only the upper half of the inner wall surface of the tunnel, a vertical support is provided between the leg portion of the reinforcing plate and the leg portion of the tunnel so as to support the reinforcing plate.
  Moreover, in the said embodiment, after pushing up the several panel installed in the circumferential direction of the tunnel, it demonstrated the case where the panels of the tunnel ceiling part were joined with the volt | bolt, However, It is limited to this Instead, a plurality of panels installed in the circumferential direction of the tunnel may be pushed up after the panels on the ceiling are joined together by bolts.
  In the above description, the case where the present invention is applied to the repair and reinforcement of the inner wall surface of a railway tunnel has been described. However, the present invention may be applied to the repair and reinforcement of the inner wall surface of a tunnel for other uses such as for roads and waterways. it can.
DESCRIPTION OF SYMBOLS 1 Tunnel 1a Brick 2 Tunnel reinforcement structure 3 Reinforcement board 3u, 3u1-3u4 Panel 3ur, 3urh Rib 3t Groove 4 Support part 4a Bolt 4b Base part 4c Nut 4d Load distribution member 4e Filling member 5 Bolt 5a Male thread part 5b Large diameter part 5c Female thread portion 6a Through hole 6b Fixed through hole 8a Recessed portion 8b Convex portion 9a Recessed portion 9b Convex portion 10 Water stop member 15 Foundation concrete portion 16 Hole 17 Water channel 22 Jack EA Overhead wire EH Signal high voltage line EL Signal low voltage wire

Claims (12)

  1. A plurality of unit reinforcing members formed along the curved inner wall surface of the tunnel and divided along the circumferential direction and the axial direction of the tunnel, the unit reinforcing members adjacent to each other in the circumferential direction of the tunnel are A reinforcing body provided so as to cover at least the upper half surface in the circumferential direction of the inner wall surface of the tunnel in a state of being meshed with each other in abutting portions;
    A support body that is provided between a leg portion of the reinforcement body and a leg portion of the tunnel on both sides in the width direction of the tunnel, and supports the reinforcement body;
    Equipped with a,
    The unit reinforcing member is formed such that the length along the circumferential direction of the tunnel is longer than the length along the axial direction of the tunnel,
    The plurality of unit reinforcing members of the reinforcing body are joined together by tightening bolts extending across the abutting portions of the unit reinforcing members for each unit reinforcing member adjacent in the circumferential direction and the axial direction of the tunnel. And
    A male screw part is formed at one axial end of the bolt,
    A large-diameter portion is formed at the other axial end of the bolt so as to prevent rotation of the bolt, and a female screw portion into which the male screw portion is screwed is formed at an end surface of the large-diameter portion. And
    Said bolt each other, the female screw portion of the large diameter portion of one of the bolts, the tunnel reinforcement structure external thread portion of the other bolt is characterized that you have been joined by being screwed axially adjacent the tunnel body.
  2. The large diameter portion is arranged in a state of protruding from the side surface in the width direction of the unit reinforcing member,
    On the side surface in the width direction of the unit reinforcing member, a hole for fitting the large diameter portion is formed so as to prevent rotation of the bolt,
    The unit reinforcing members adjacent to each other in the axial direction of the tunnel are in a state in which the large diameter portion protruding from the side surface of one unit reinforcing member is fitted in the hole formed on the side surface of the other unit reinforcing member. The tunnel reinforcement structure according to claim 1, wherein the tunnel reinforcement structure is bonded to each other .
  3.   The unit reinforcing members adjacent to each other in the circumferential direction of the tunnel in the ceiling portion of the tunnel are joined so as to be engaged with each other in a state of being offset in the axial direction of the tunnel at each abutting portion. The tunnel reinforcing structure according to 1 or 2.
  4. 4. The tunnel reinforcing structure according to claim 1 , wherein the unit reinforcing members adjacent to each other in the axial direction of the tunnel are joined by the bolt for each unit reinforcing member .
  5. In the ceiling portion of the tunnel, the unit reinforcing members adjacent to each other in the circumferential direction of the tunnel are joined so as to mesh with each other in a state of being offset in the axial direction of the tunnel at the abutting portions.
    In the ceiling portion of the tunnel, each butted portion of the unit reinforcing members adjacent in the circumferential direction of the tunnel is formed in a shape in which the width becomes narrower toward each tip,
    In the ceiling portion of the tunnel, two bolts are arranged in parallel along the circumferential direction at each butting portion of the unit reinforcing members adjacent in the circumferential direction of the tunnel,
    3. The tunnel reinforcement according to claim 1 , wherein in the ceiling portion of the tunnel, the unit reinforcing members adjacent in the axial direction of the tunnel are joined by the bolt every two unit reinforcing members. Structure.
  6. In the unit reinforcing member on the ceiling of the tunnel, the through hole through which the bolt passes is formed such that the length in the thickness direction of the unit reinforcing member is longer than the length in the circumferential direction of the tunnel . The tunnel reinforcing structure according to claim 5 .
  7. The surface of the unit reinforcing member that faces the inner wall surface of the tunnel is provided with a protruding portion that protrudes toward the inner wall surface of the tunnel, and the protruding portion extends along the circumferential direction of the tunnel. tunnel reinforcing structure according to any one of claims 1 to 6, characterized in that it is kicked set in the state.
  8. On the surface of the reinforcement body facing the inner wall surface of the tunnel, a water conduit is formed by a groove between the projecting portions adjacent to each other along the axial direction of the tunnel. The tunnel reinforcing structure according to claim 7 , wherein the tunnel reinforcing structure is formed in a continuous state along a direction .
  9. Between the facing surfaces of the unit reinforcing member and the inner wall surface of the tunnel, the tunnel according to any one of claims 1 to 8, characterized in that the water flow member having a water-permeability are al provided Reinforced structure.
  10. Tunnel reinforcing structure according to any one of claims 1-9, characterized in that the water stop member are found provided on the joint portion of the unit reinforcing members together.
  11. The reinforcing body is supported in a state in which the reinforcing body is pushed up by the support bodies on both sides in the width direction of the tunnel from the leg portions of the tunnel toward the ceiling and pressed against the inner wall surface of the tunnel. The tunnel reinforcement structure of any one of Claims 1-10.
  12. The reinforcing body is divided at a ceiling portion of the tunnel in the circumferential direction of the tunnel, and is divided between a ceiling portion and a leg portion of the tunnel, and is configured by four unit reinforcing members in total. The tunnel reinforcement structure according to any one of claims 1 to 11, wherein
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