JP4422647B2 - Tunnel inner surface protection and reinforcement structure - Google Patents

Description

  The present invention, for example, when a segment ring used for protection / reinforcement structure against concrete peeling or tunnel deformation on the inner surface of a tunnel is divided into an opening portion by equipment protruding on the inner surface side of the tunnel, The present invention relates to a tunnel inner surface protecting / reinforcing structure that prevents a decrease in strength and rigidity of a segment ring as a tunnel inner surface protecting / reinforcing structure in the same cross section, and has the same reinforcing effect as a ring without an opening.

  There is known a tunnel inner surface protection / reinforcement structure in which a large number of plate-like segments are provided in the circumferential direction along the inner surface of a tunnel or a tunnel lining to reinforce an existing or new tunnel inner surface.

  Such a structure prevents the inner wall or lining concrete from collapsing and peeling in an old or healthy existing or new tunnel, even if the inner wall of the tunnel or concrete collapses. Protecting the flaking pieces from falling into the tunnel, and also protecting the inner surface of the tunnel for the purpose of reinforcing against loosening of the ground or deformation caused by external forces such as plastic pressure. Effective for protecting and reinforcing the inner surface of tunnels such as railway tunnels.

  As the tunnel inner surface protection / reinforcement structure as described above, thin segments are assembled on the inner surface of the tunnel in a staggered pattern for each ring (meaning semicircular ring), and the grout is filled between the existing lining and the segment. It is known to construct a protection / reinforcement structure for the inner surface of the tunnel (see, for example, Patent Document 1). Such a protective / reinforcing structure for the inner surface of the tunnel using thin segments is a reinforcing structure that is thin and has little overhang on the inner surface of the tunnel, and can be quickly constructed.

  On the other hand, when carrying out construction such as protection and reinforcement in a road tunnel that is in service, it is desirable that construction be performed without hindering road traffic as much as possible. For this reason, it is generally practiced that the road is closed on one side of the road while the other lane is in service.

  In existing tunnels such as aging or sound railway tunnels and road tunnels, the lining concrete is prevented from collapsing and falling, and even if concrete collapses, the flakes do not fall into the tunnel. As for the tunnel lining inner surface protection / reinforcement structure and its construction method and the segment used for this purpose, The applicant previously proposed as Japanese Patent Application Laid-Open No. 2004-150072 (Patent Document 1).

  As a feature of the tunnel inner surface protection / reinforcement structure and the segment used in the structure, the connection between the adjacent segments in the tunnel axial direction and the tunnel circumferential direction is not a means for firmly integrating and connecting the segments. The joint material provided on the back surface of the segment transmits a shear (shear) force in at least the tunnel radial direction that engages with the joint material provided on the back surface or the back surface of the segment adjacent in the tunnel axial direction or the tunnel circumferential direction. This is a shear key (joint material such as a bowl, rod, or plate), and is characterized in that the segments are connected by the engagement of the shear keys without firmly integrating the shear keys. By means of this, at least the shear force in the radial direction of the tunnel It is transmitted to the adjacent segment (or segment ring), and the external force is widely distributed to the segment or segment ring in the tunnel axial direction or tunnel circumferential direction, so that the external force is not concentrated on one segment or segment ring. This is the point of having a reinforced structure.

  The contents of Japanese Patent Application Laid-Open No. 2004-150072, in which the tunnel inner surface protection / reinforcement structure having the above-described characteristics is disclosed, will be briefly described with reference to FIGS. 14 to 17. As shown in FIG. As a joint material for connecting the segment rings 7 adjacent to each other in the tunnel axial direction to a plurality of locations on the arcuate sides 4 and 5 forming the circumferential direction of the tunnel in the reinforcing segment (hereinafter also referred to as a segment) 1 in the circumferential direction Shear key 3 (3a, 3b) for transmitting at least a shearing force in the tunnel radial direction to the adjacent segment in the tunnel axial direction is provided so as to project in the tunnel axial direction, and for protection and reinforcement. As a joint material for connecting adjacent segments in the circumferential direction of the tunnel to the sides 24 and 25 of the segment 1 in the tunnel axis direction. The shear key 3 is provided so as to project in the circumferential direction of the tunnel with an interval in the tunnel axis direction, and the tunnel covering inner surface protecting / reinforcing segment 1 is provided with a tunnel covering as shown in FIG. 16 or FIG. Arranged along the inner surface of the work and assembled in a staggered manner for each segment ring 7 adjacent in the tunnel axial direction, assembled in a zigzag manner. The lower end of the segment ring 7 is fixed to the concrete of the existing tunnel 43 by fixing means such as a fixing bracket 35. It is fixed to the floor slab 34.

  In one segment 1, the male sheer key 3 protruding so as to protrude in the tunnel axis direction provided in the vicinity of the sides 4 and 5 forming the circumferential direction of the tunnel is provided on the existing side (front side) in the tunnel axis direction. The position of the shear key 3 (3a) and the position of the new side (rear side) shear key 3 (3b) are shifted in the tunnel circumferential direction (the arcuate circumferential direction of the protective / reinforcing segment body 2). It has been.

  The protective / reinforcing segment body 2 is provided with a tension member 8, and this member 8 includes a female screw hole 9 penetrating in the tunnel radial direction and a tension screw shaft 10 screwed into the female screw hole 9. Yes. The projecting member 8 has a distal end projecting toward the back surface side of the protective / reinforcing segment main body 2 in the radial direction of the tunnel, and is pressed against the existing tunnel lining inner wall surface 41 to thereby be continuously segmented in series in the circumferential direction. By acting to reduce the diameter of the segment ring 7 in the tunnel radial direction, axial force is introduced to the protective / reinforcing segment ring 7 in the tunnel circumferential direction, and the shape of the arch by the segment ring 7 is deformed. Restraints and stabilizes the arch. At the proximal end of the tension screw shaft 10 on the inner side of the tunnel, a turning tool engaging recess 13 (see FIG. 15c) is provided.

  Further, the arcuate side 4 on the front side (existing side) and the arcuate side 5 on the rear side (new side) forming the circumferential direction of the tunnel at both ends in the tunnel axial direction (front-rear direction) on the back surface of the protective / reinforcing segment body 2 In the vicinity, the same segment ring as the jigs 16 and 17 for the inter-ring fixing jig 14 for fixing the segments 1 adjacent to each other in the tunnel axis direction (that is, the segment rings 7 adjacent to each other in the tunnel axis direction). 7, jigs 19 and 20 for a circumferential segment fixing jig 15 for connecting and fixing the segments 1 adjacent to each other in the tunnel circumferential direction are provided.

  The ring-to-ring fixing jig 14 or the circumferential segment fixing jig 15 is for temporarily holding the new segment 1 temporarily when the new segment 1 is assembled adjacent to the existing segment 1. The jigs 14 and 15 are inclined in the tunnel axis direction or the tunnel circumferential direction, and the brackets of these jigs are separated from each other. A large stress in the direction or the tunnel circumferential direction cannot be transmitted to the segment 1 adjacent in the tunnel axial direction or the tunnel circumferential direction.

  When assembling the segment 1 along the inner wall surface 41 of the tunnel lining, the fixing bracket 35 for fixing the end of the segment 1 in the circumferential direction of the tunnel is installed on the end of the concrete floor slab 34. Assembled. More specifically, as shown in FIG. 17, each segment 1 located at the lower end (the left end and the right end in FIG. 17) on both ends of the segment ring 7 (7a, 7b) constructed sequentially in the tunnel axis direction is supported. A fixing bracket 35 as an end member for the purpose is installed on the concrete floor slab 34.

  For example, as shown in FIG. 17B, the fixture 35 is a fixture 35 having a receiving groove 38 that is formed by a pair of arm pieces 36 and 37 and extends upward in the tunnel axis direction. In the receiving groove 38 of 35, the segment 1 for protecting / reinforcing the end portion is arranged along the inner surface of the existing lining 40, and the lower end of the segment 1 is a fixing bracket 35 having the receiving groove 38. If necessary, adjust the pressing bolt 39 screwed to one arm piece 36 on the inner side of the tunnel in the fixing bracket 35 having the receiving groove 38 as necessary by interposing a spacer or the like. The lower part of segment 1 is fixed. The shear key 3 projecting in the tunnel axis direction in the segment 1 at the lower end is in contact with and engaged with the back surface of the segment 1 (the surface of the segment facing the tunnel lining inner wall surface 41).

  The segments 1 adjacent to each other in the circumferential direction are fixed by an inter-segment fixing jig 15. More specifically, referring to FIG. 16 and FIG. 17, one end side (existing side) in the circumferential direction of the new segment 1 to construct the segment ring 7 is arranged and fixed to a fixing bracket 35 as an end member, Alternatively, it is arranged on the new side of the already incorporated segment 1 in the circumferential direction.

  And the jig | tool 19 which consists of the steel bracket 30 which has the bolt insertion hole located in the existing side in the one (new installation) segment 1 adjacent in series in the circumferential direction, and the new installation side in the segment 1 of the other circumferential direction (existing) The bolt 21 is inserted and screwed over the female jig 20 having the nut 33 located at the position, and the jigs 19 and 20 between the new and existing segments 1 adjacent to each other in the circumferential direction are connected and fixed in the circumferential direction. The segments 1 adjacent to each other are connected and fixed to each other.

As shown in FIG. 16, the tunnel inner surface protecting / reinforcing segment 1 is assembled in a staggered manner in the segment ring 7 adjacent in the tunnel axial direction as shown in FIG. 16, and the lower end is fixed to the concrete of the existing tunnel by the fixing means (fixing bracket 35). The fixed tunnel lining inner surface protection / reinforcement structure engages the back surface of the segment 1 adjacent to the tunnel axis direction by the shear key 3 protruding so as to project in the tunnel axis direction, and transmits shearing force and bending moment. The inner surface protection / reinforcement structure of the tunnel lining that can transmit shearing force by engaging the rear surface of the segment adjacent in the tunnel circumferential direction by the shear key 56 protruding so as to protrude in the circumferential direction of the tunnel It can be.
Therefore, even if the concrete peels off the existing tunnel inner wall surface and a load acts on the segment, shear force, bending moment, or axial force in the circumferential direction of the tunnel can be transmitted to the surrounding segments and dispersed throughout the structure. A stable protection / reinforcement structure can be obtained.

  Further, when an appropriate segment ring 7 is constructed in the tunnel axis direction, when the grout 42 is filled on the back surface of the segment ring 7 from the segment 1 in which the grout injection hole is previously provided in the segment body 2, the segment ring 7 The existing lining inner surface 41 is brought into close contact with each other, so that the deformation of the segment 1 toward the existing lining surface 41 is restrained, and the segment ring 7 can be stabilized.

  The grout is provided to constrain the deformation of the segment 1 and the segment ring 7 in the direction of the existing lining surface 41, so that the grout is directly filled between the existing tunnel lining surface 41 and the back surface of the segment ring 7. Alternatively, it may be filled in a bag or the like previously set on the back surface of the segment 1 and the segment ring 7.

  By the way, although not disclosed in the prior art, the tunnel inner surface protecting / reinforcing structure using the tunnel inner surface protecting / reinforcing segment 1 as described above has a semicircular arch-shaped segment ring 7 having both end portions. The lower end portions of the segment ring 7 can be securely fixed by the fixing bracket 35 provided on the concrete floor slab 34 at the bottom of the tunnel so that the shape of the segment ring 7 can be stabilized.

  However, as shown in FIG. 18, in a tunnel 43 such as a railway tunnel or a motorway tunnel, a support facility supporting a feeder or a suspension line protruding from the tunnel top, or an exhaust facility or tunnel at the top of the tunnel. If there is a lighting equipment or the like, or a protruding equipment 22 that supports these, and there is such a protruding equipment 22 on the inner side of the tunnel, the segment ring continuously extends in the circumferential direction of the tunnel across the fixing brackets 35 at the lower ends. 7 cannot be constructed, and an opening 23 is formed in which the segment 1 is not provided slightly before the protruding equipment 22 in the circumferential direction of the tunnel, and the semicircular segment ring 7 is formed by the opening 23 in the circumferential direction of the tunnel. The segment ring 7c (hereinafter referred to as an arc-shaped segment ring 7c), which is divided into two in the circumferential direction of the tunnel. In this specification, the term “arc-shaped segment ring” refers to an arc-shaped segment ring divided in the tunnel circumferential direction by an opening, in this case, left and right divided into two in the tunnel circumferential direction by the opening. Arc-shaped ring.)

  When the protruding equipment 22 is relatively long in the tunnel axis direction, it does not fit within the width of one segment ring 7 in the tunnel axis direction, but the width of two segment rings 7 or three or more segment rings. 7, the opening 23 is required, and the inner surface of the tunnel is reinforced by the arc-shaped segment ring 7c divided by the opening 23 accordingly.

As described above, the individual arc-shaped segment rings 7c divided in the tunnel circumferential direction are fixed at the lower end side thereof by the fixing bracket 35. However, if the segment end portion at the upper end side is not fixed, the left and right arc-shaped segment rings 7c are fixed. 7c and the segment 1 constituting the segment ring 7c can be displaced in the circumferential direction of the tunnel, so that if the inner wall of the tunnel or concrete collapses, these loads cannot be sufficiently transmitted in the circumferential direction of the tunnel. These loads are tolerated mainly by a mechanism that transmits in the tunnel axial direction. Therefore, there is a problem that the arc-shaped ring 7c has low rigidity and low strength.
JP2004-150072

  In the present invention, as described above, (1) a segment ring is configured by installing plate-like segments in the tunnel circumferential direction and tunnel axial direction inside the tunnel, and (2) an end of the segment ring in the tunnel circumferential direction. (3) Directly constraining the segment ring by filling the back of the segment with a display curable filler such as a grout material or directly into a bag body for grout filling, etc. In the repair / reinforcement method, when an existing structure or the like protrudes toward the inner space of the tunnel and the opening must be provided, the arc segment ring adjacent to the opening or the arc segment ring The tunnel inner surface protection / reinforcement structure has sufficient rigidity and strength equivalent to the segment ring of the cross section in which the segment constituting the opening does not have an opening. An object of the present invention is to provide a.

  In order to advantageously solve the above-described problems, the present invention provides a tunnel inner surface protection / reinforcement structure according to the first invention in which plate-like segments divided in the tunnel circumferential direction and the tunnel axial direction are installed along the tunnel inner surface. In the tunnel inner surface protection / reinforcement structure for protecting / reinforcing the tunnel inner surface, the opening in each arc segment ring divided in the circumferential direction of the tunnel across the opening in order to avoid equipment protruding to the tunnel inner surface side An opening side end of the segment adjacent to the tunnel is fixed by a fixing means to at least one of the inner wall surface of the tunnel and the segment ring adjacent to the tunnel axial direction and not divided in the tunnel circumferential direction, and the opening The displacement movement of the segment adjacent to is restricted in the circumferential direction of the tunnel.

  In the tunnel inner surface protection / reinforcement structure according to the second aspect of the present invention, a plate-like segment divided in the tunnel circumferential direction and tunnel axial direction is installed along the tunnel inner surface to protect and reinforce the tunnel inner surface. In the protection / reinforcement structure, each arc segment ring divided in the tunnel circumferential direction across the opening to avoid equipment projecting to the inner surface of the tunnel is adjacent to the tunnel axis direction and is not divided in the tunnel circumferential direction It is fixed to the segment ring, and the displacement movement of each arc-shaped ring in the circumferential direction of the tunnel is restricted.

  In the third invention, in the tunnel inner surface protection / reinforcement structure of the first invention, an end fixing bracket is used as a fixing means for the opening side end of the segment adjacent to the opening, and the end fixing bracket is A base portion fixed to the inner wall of the tunnel, a vertical portion provided integrally with the base portion, abutting on an end portion of the segment adjacent to the opening, and integrally provided on the vertical portion, An end fixing bracket including a support portion for supporting an end portion on the opening side of the segment is provided.

  Further, in the fourth invention, in the tunnel inner surface protection / reinforcement structure of the first invention, a segment adjacent to the opening in the tunnel circumferential direction, and a segment in the segment ring adjacent to the tunnel axial direction and not divided in the tunnel circumferential direction, However, it is characterized by being fixed by each connecting arm provided on the back surface of these segments and a fixing tool for fixing each connecting arm to each other.

  Further, in the fifth invention, in the tunnel inner surface protection / reinforcement structure of the first invention or the second invention, the tunnel circumferential direction in the segment adjacent to the opening in the arc-shaped segment ring divided in the tunnel circumferential direction across the opening is defined. The end of the side to be formed on the opening side is fixed by means of welding or bolting to a segment ring adjacent in the tunnel axial direction.

 In the sixth invention, in the tunnel inner surface protection / reinforcement structure of the first invention, an end fixing bracket is used as a fixing means for the opening side end of the segment adjacent to the opening, and the end fixing bracket is A base portion fixed to the inner wall of the tunnel, a vertical portion provided integrally with the base portion, and a support portion provided integrally with the vertical portion and in contact with the rear surface of the end portion on the opening side of the segment And an end portion of the segment on the opening side is fixed to the support portion with a bolt.

  Further, in the seventh invention, in the tunnel inner surface protection / reinforcement structure of the first invention, an end fixing bracket is used as a fixing means for the opening side end of the segment adjacent to the opening, and the end fixing bracket is A base portion fixed to the inner wall of the tunnel, a vertical portion provided integrally with the base portion, and a support portion provided integrally with the vertical portion and in contact with the rear surface of the end portion on the opening side of the segment An end fixing bracket having a substantially U-shaped cross-section, and the end of the segment on the opening side is fixed to the support portion with a bolt.

  Further, in the eighth invention, in the tunnel inner surface protection / reinforcement structure of the first invention, the end of the segment body adjacent to the opening in each arc segment ring divided in the circumferential direction of the tunnel is connected to the inside of the tunnel. A vertical portion extending toward the wall surface is integrally provided, and a base portion extending integrally toward the opening in the circumferential direction of the tunnel is provided in the vertical portion, and the base portion is fixed to the tunnel inner wall by a fixing means. The shift movement of the segment adjacent to the opening in the circumferential direction of the tunnel is restricted.

  According to the first aspect of the present invention, since the end of the segment on the opening side of the arc-shaped segment ring is prevented from shifting in the circumferential direction of the tunnel, the segment adjacent to the opening or this It is possible to prevent the arc-shaped segment ring including the shift from moving toward the opening side, exhibit the strength and rigidity of the arc-shaped segment ring in the tunnel circumferential direction, and exhibit a reinforcing effect as a strong shell structure.

  According to the second invention, the arc segment ring adjacent to the opening in the tunnel circumferential direction is fixed to the segment ring adjacent to the tunnel axial direction and not divided in the tunnel circumferential direction. By fixing to the segment ring that is adjacent to the tunnel and not divided in the circumferential direction of the tunnel, the arc-shaped segment ring is restrained from moving easily in the circumferential direction of the tunnel, and the strength and rigidity of the arc-shaped segment ring in the circumferential direction of the tunnel is restricted. The reinforcing effect can be exhibited as a strong shell structure.

  According to a third aspect of the present invention, a simple-shaped end fixing bracket having a base portion, a vertical portion integral with the base portion, and a supporting portion integral with the base portion is used. It is fixed to the inner wall, the vertical part of the end fixing bracket is brought into contact with the opening side end surface of the segment, and the support part is engaged with the tunnel inner surface protecting / reinforcing segment. Even if the segment adjacent to the opening is about to move to the opening side, it can be fixed so that the segment located at the end of the opening is securely restrained to prevent the movement of the segment on the opening side end. Thus, a strong tunnel inner surface protecting / reinforcing structure capable of preventing the displacement of the arc segment ring in the circumferential direction of the tunnel including the segment can be obtained.

  According to the fourth invention, the connecting arm is simply connected to the back surface of the segment adjacent to the opening in the tunnel circumferential direction and to the back surface of the segment in the segment ring adjacent to the opening in the tunnel axial direction and not divided in the tunnel circumferential direction. Even if the outer surface acts on the segment adjacent to the opening when the tunnel inner surface is peeled off, the displacement movement in the tunnel circumferential direction is restricted, A strong tunnel inner surface protection and reinforcement structure can be obtained.

  According to the fifth aspect of the present invention, the end on the opening side of the side that forms the tunnel circumferential direction of the segment adjacent to the opening in the tunnel circumferential direction, and the side that forms the tunnel circumferential direction of the segment adjacent to the tunnel axial direction. By simply fixing with welding or bolts or other fixing means, it is possible to restrain the displacement of the segment adjacent to the opening in the circumferential direction of the tunnel in the circumferential direction of the tunnel, and the arc segment segmented by the opening. Since the displacement of the ring in the circumferential direction of the tunnel can be prevented, a strong tunnel inner surface protection / reinforcement structure can be obtained.

  According to the sixth aspect of the present invention, the end portion of the base portion is formed using a simple shape end fixing bracket having a support portion that is in contact with the back surface of the end portion of the segment. The base part of the fixing bracket is fixed to the inner wall of the tunnel, and the support part is brought into contact with the back of the end of the segment and fixed with a bolt. The segment adjacent to the opening is displaced toward the opening side due to the collapse of the inner wall of the tunnel. Even if it tries to move, it can fix the segment located at the end of the opening to be surely restrained to prevent the movement of the segment at the end of the opening side, and the arcuate segment in the tunnel circumferential direction including this segment A strong tunnel inner surface protecting / reinforcing structure that can prevent the ring from shifting is provided. In addition, since the end fixing bracket has a structure arranged on the back surface of the segment, the end fixing bracket does not protrude to the inner space side of the tunnel adjacent to the opening, so that there is less dead space on the inner space side of the tunnel. At the same time, aesthetics can be improved.

  According to the seventh aspect of the present invention, an end fixing bracket having a simple shape with a substantially U-shaped cross section provided with a support portion that is in contact with the back surface of the end portion of the segment is integrated with the base portion through the vertical portion. Then, the base portion of the end fixing bracket is fixed to the inner wall of the tunnel, and the support portion is abutted against the back surface of the end portion of the segment and is fixed with a bolt. Even if it is going to shift to the opening side, the segment located at the end of the opening can be fixed so as to be surely restrained to prevent the movement of the segment at the end of the opening side. A strong tunnel inner surface protection / reinforcement structure that can prevent the arc-shaped segment ring from shifting in the circumferential direction of the tunnel can be obtained. In addition, the end fixing bracket having a substantially U-shaped cross section has a structure in which the whole is disposed on the rear surface of the segment, so that the end portion is located on the inner side of the tunnel adjacent to the opening and the tunnel circumferential opening side. Since the fixing bracket does not protrude, the dead space on the tunnel inner side and the tunnel circumferential opening side is reduced, and the aesthetic appearance can be improved.

  According to the eighth invention, a vertical portion extending toward the inner wall surface of the tunnel is integrally provided at the end portion of the segment main body adjacent to the opening portion, and the opening portion side in the tunnel circumferential direction is integrally formed with the vertical portion. A base portion extending toward the tunnel is provided, and the base portion is fixed to the inner wall of the tunnel by fixing means, so that displacement of the segment adjacent to the opening in the circumferential direction of the tunnel is restricted. By simply providing the vertical portion and the base portion in the segment itself adjacent in the direction, a simple structure that does not require a separate end fixing bracket can be achieved. In addition, the segment itself at the opening side end can be prevented from being displaced by the segment itself, and the tunnel inner surface protection / reinforcement structure that can prevent the displacement of the arc-shaped segment ring in the circumferential direction of the tunnel including this segment is provided. be able to. In addition, since the end fixing metal fitting is not separately provided on the inner side of the tunnel adjacent to the opening, the dead space on the inner side of the tunnel is reduced, and the aesthetics can be improved.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  1 to 4 show a tunnel inner surface protection / reinforcement structure according to a first embodiment of the present invention, and an opening end fixing bracket used in the structure. FIG. 25 shows a cross section of the segment at the open end of the second embodiment of the present invention. 5 and 6 show a tunnel inner surface protection / reinforcement structure according to a third embodiment of the present invention, FIG. 7 shows a modification of the third embodiment, FIG. 8 shows a fourth embodiment, and FIGS. Reference numeral 10 denotes a first example and a second example of a tunnel inner surface protecting / reinforcing segment used in the present invention.

  First, the illustrated form of the tunnel inner surface protecting / reinforcing segment disposed adjacent to the opening will be described with reference to FIG. For the tunnel inner surface protecting / reinforcing segment not adjacent to the opening 23, the same segment 1 as in the conventional case is used.

  The tunnel inner surface protecting / reinforcing segment of the form shown in FIG. 9 is a tunnel inner surface protecting / reinforcing segment 1A used in the tunnel inner surface protecting / reinforcing structure of the first embodiment or the fourth embodiment of the present invention, The segment main body 2 for protecting and reinforcing the inner surface of the tunnel is the same segment main body 2 as in the conventional case. The form of the segment body 2 may be other than the form shown in the figure, that is, it is not a plate shape as shown in FIG. 9, but is a metallic material provided so as to surround four sides as shown in FIG. You may be comprised with the frame 61, the metallic face material 62, the reinforcement rib 63, etc. FIG. Further, the planar shape of the segment body 2 may not be rectangular. For example, as shown in FIG. 20, the lengths of the sides 24 and 25 forming the tunnel axis direction may be different at both ends in the tunnel circumferential direction. The arcuate sides 4 and 5 forming the circumferential direction may be partially or not parallel.

  Although it overlaps with the conventional case, here will be described briefly with reference to FIG. 9. Each side 4 forming a tunnel circumferential direction in a substantially rectangular plate-shaped protective / reinforcing segment (hereinafter also referred to as a segment) 1A, As a joint material for connecting the segment rings 7 adjacent to each other in the tunnel axis direction at a plurality of locations 5, at least a shearing force in the tunnel radial direction is applied to the segment 1 adjacent in the tunnel axis direction at intervals in the circumferential direction. Shear key 3 for transmission is provided so as to project in the tunnel axis direction, and the adjacent segments 1 in the tunnel circumferential direction are connected to the sides 24 and 25 that form the tunnel axis direction in the protective / reinforcing segment 1A. As a joint material for this purpose, a shear key 56 is provided so as to project in the tunnel circumferential direction with an interval in the tunnel axis direction.

  The shear key 3 and the shear key 56 as the joint material may be only the male type shear key 3 protruding from the segment body 2 in the tunnel axis direction between the adjacent segments 1, and the shape of the shear key is shown in FIG. As described above, a combination of a male sheer key 3 (3a, 3b) and a joint member composed of a female sheer key 3c that does not protrude from the segment body 2 may be used.

  The male sheer key 3 protruding so as to project in the tunnel axis direction includes the position of the existing sheer key 3 (3a) in the tunnel axis direction and the sheer key 3 (3b) on the new side (rear side). The position is shifted in the circumferential direction of the tunnel (the arcuate circumferential direction of the protective / reinforcing segment body 2).

  The protective / reinforcing segment body 2 is provided with a tension member 8, which is constituted by a female screw hole 9 penetrating in the tunnel radial direction and a tension screw shaft 10 screwed into the female screw hole 9. ing. The projecting member 8 has a distal end projecting toward the back surface side of the protective / reinforcing segment main body 2 in the radial direction of the tunnel and pressing it against the inner wall surface 41 of the existing tunnel lining so that the segment 1 is connected in series in the circumferential direction. By acting to reduce the diameter of the segment ring 7 in the tunnel radial direction, the axial force is introduced to the protective / reinforcing segment ring 7 in the circumferential direction of the tunnel, and the deformation of the arch shape due to the segment ring is restrained. And stabilize the arch. As shown in FIG. 15, a turning tool engaging recess 13 is provided at the proximal end of the tension screw shaft 10 on the inner side of the tunnel.

  Further, the arcuate side 4 on the front side (existing side) and the arcuate side 5 on the rear side (new side) forming the circumferential direction of the tunnel at both ends in the tunnel axial direction (front-rear direction) on the back surface of the protective / reinforcing segment body 2 In the vicinity, a jig 16 for the inter-ring fixing jig 14 for fixing the segments 1 (1A) adjacent in the tunnel axis direction (that is, the segment rings 7 and 7c adjacent in the tunnel axis direction); Jigs 19 and 20 for a circumferential segment fixing jig 15 for connecting and fixing the segments 1 adjacent to each other in the tunnel circumferential direction in the same segment ring 7 are provided.

  Further, as a part different from the conventional case, in this embodiment, a shear key 56 as a shearing force transmission member projecting toward the segment 1 adjacent in the circumferential direction of the tunnel is provided at the opening side end portion 26 in the segment body 2. As shown in FIG. 4, since it is not required on the opening 23 side, it is not provided.

Further, as shown in FIGS. 4 and 9, the segment 27 adjacent to the opening 23 in the circumferential direction of the segment 1, 1 </ b> A located adjacent to the opening 23 in the circumferential direction of the tunnel It is not necessary to provide the shear key 3 (56) on the sides 24 and 25 which form the tunnel axis direction.
The side 25 forming the tunnel axis direction on the opening 23 side is a side parallel to the tunnel axis direction.

  In the first embodiment shown in FIGS. 1 to 4, the segments 1 are assembled in order from the fixing bracket 35 at both ends in the tunnel along the inner peripheral surface of the tunnel, and the segment 1A used as the end of the opening 23 is as follows. 9 shows a form in which the tunnel inner surface protecting / reinforcing segment 1A shown in FIG. 9 is used as a segment adjacent to the open end of the arc-shaped segment ring 7c divided in the circumferential direction of the tunnel. In FIGS. 1 and 2, attachment devices such as the shear key 3 attached to the segment body 2 are omitted.

  More specifically, as in the conventional case shown in FIG. 17 (a), the segment 1 is assembled from the concrete floor slab 34 at the lower part of the tunnel toward the equipment 22 projecting inside the tunnel at the upper part in the circumferential direction of the tunnel. The state in which the segment 1A shown in FIG. 9 is arranged as the end segment of the opening 23 as the end segment 1A of the portion that avoids the protruding equipment 22 is the state shown in FIG.

  FIG. 2 shows an enlarged view of the vicinity of the end segment 1A located on the left side of the opening 23 in FIG. 1, and FIG. 3 shows a perspective view of the end fixture 28 in FIG. 1 shows a developed plan view seen from the back side of the segment. The left and right arc-shaped segment rings 7c divided by the opening 23 and the end fixing bracket 28 arranged at the opening side end are the same, so the left side of the opening 23 will be mainly described.

  The shear key 3 in the segment 1A is engaged with the rear surface of the existing segment 1 adjacent in the tunnel axis direction or the segment 1 adjacent in the tunnel circumferential direction. The end 26 on the opening 23 side of the segment 1A is fixed by an end fixing bracket 28 as shown in FIG. 3 so as to restrain movement toward the tunnel circumferential opening.

  Here, the shape of the end fixing metal fitting 28 will be described with reference to FIGS. 2 and 3. A base portion (an upper flange in FIGS. 3 a and b) 45 fixed to the tunnel inner wall surface 41 by an anchor material 44. In addition, a vertical portion 46 that descends at a right angle from the lower surface end portion of the base portion 45 is integrally bent and connected to the base portion 45.

  In addition, a support portion 47 that projects in a cantilevered manner in the opposite direction to the base portion 45 is provided at the lower end portion of the vertical portion 46. The vertical portion 46 is in contact with the end face 26 of the segment 1A adjacent to the opening 23 on the opening side and functions as a stopper portion that restrains the movement of the segment 1A in the tunnel circumferential direction. The support portion 47 provided integrally with the portion 46 is configured to support the lower surface of the end portion on the opening side of the segment 1 </ b> A with the upper surface of the support portion 47.

The base portion 45 and the vertical portion 46 are provided with reinforcing ribs 49 on the opposite side of the support portion 47 at intervals in the longitudinal direction of the member to increase the bending rigidity of the end fixing bracket 28. The base portion 45 is provided with a vertically extending bolt insertion hole 50 between adjacent reinforcing ribs 49, and the end fixing bracket 28 includes a plurality of bolt insertion holes 50 spaced in the longitudinal direction thereof. With such an end fixing bracket 28, the movement toward the tunnel circumferential direction opening can be fixed in a stable state at the opening end 26 of the segment 1A adjacent to the opening 23. Has been.
Therefore, the arc-shaped segment ring 7c having the lower end fixed by the fixing bracket 35 and the upper end fixed by the end fixing bracket 28 can exhibit a reinforcing effect as a strong shell structure.

  When the end fixing bracket 28 is attached to an inner wall of a tunnel such as an existing lining, an anchor hole 48 is provided in the inner wall of the existing lining 40 or the like, and an anchor material 44 such as an anchor bolt is provided in the anchor hole 48. The end portion is fixed to the inner wall of the tunnel by an adhesive or other means, the base portion 45 is brought into contact with the inner wall of the tunnel, and the anchor material 44 is inserted into the bolt insertion hole 50 of the base portion 45, so that the anchor material 44 The screwed nut 51 is tightened and the vertical portion 46 is in contact with the opening-side end portion 26 of the segment 1A so that the end portion 26 on the opening 23 side of the segment 1A is fixed so as not to move in the tunnel circumferential direction. In addition, when the grout 42 is filled on the back surface of the segment 1A or the arcuate segment ring 7c of the segment 1A, the opening of the segment 1A End of the 23 side is also securely fixed for movement of the tunnel radially.

  The support portion 47 supports the lower surface on the opening 23 side of the end segment 1A located on the opening 23 side, so that the end segment 1A on the opening 23 side in the tunnel radial direction, particularly toward the inside of the tunnel. The end of the segment 1A can be reliably supported and fixed in a stable state.

  As described above, the segment 1A adjacent to the opening 23 has both the end fixing bracket 28 and the grout 42 filled in the back surface of the segment 1A or the back surface of the segment ring 7c of the segment 1A. Is prevented from shifting in the tunnel radial direction. In addition, a bag body may be installed in advance on the back surface of the segment 1A, and the grout may be filled in the bag body (not shown) after assembling the segments.

  In the above-described embodiment, the embodiment in which the width in the tunnel axis direction is the opening 23 for one segment is shown. However, as in the modification schematically shown in FIG. When it is necessary to provide the opening 23 over a width of 3 rings (in the case of illustration), the arc segmented ring 7c formed by being divided becomes 2 rings or 3 rings or more in the tunnel axis direction. Therefore, as the end fixing bracket 28 in such a case, the length in the tunnel axis direction may be approximately two rings or three rings, or one ring for each segment 1A. An end fixing bracket 28 slightly shorter than the length may be provided in the tunnel axis direction.

  Moreover, in the said embodiment, although the segment division | segmentation which comprises the segment ring 7 in the cross section which does not have the opening part 23, and the arc-shaped segment ring 7c of the opening part 23 is a staggered set, the segment 1, 1A is a splice. Alternatively, the segment 1 may be divided only in the tunnel axis direction and may not be divided in the tunnel circumferential direction. For example, FIG. 21 schematically illustrates an example of splicing, and FIG. 22 schematically illustrates an example of segment 1 that is divided only in the tunnel axis direction and not in the tunnel circumferential direction. It is omitted. In these forms, the joint of the segments 1 and 1A is provided with the convex part 64 or the concave part 65 continuously on the outer peripheral part of the segment main body 2, and when the segment of such a form is used, the tunnel shaft The displacement structure in the tunnel radial direction is constrained and the displacement deformation in the tunnel circumferential direction is not constrained by the fitting structure of the concave portion and the convex portion of the segment adjacent in the direction or the circumferential direction of the tunnel. Further, the segment main body structure may not be such a flat plate structure as in the zigzag assembly example.

  Furthermore, other embodiments other than the end fixing bracket 28 of the first embodiment are shown in FIGS. Hereinafter, only differences from the first embodiment will be described with reference to FIGS. 23 and 24. In the embodiment shown in FIG. 23, the end fixing bracket 28 is provided integrally with the vertical portion 46, and has an end fixing bracket having a support portion that comes into contact with the back surface of the end portion on the opening side of the segment 1A. Has been. The segment 1A at the end adjacent to the opening 23 has a female screw hole 59 provided in the vicinity of the opening side end of the segment 1A and a female screw hole 58 provided in the support portion 47 of the end fixing bracket 28. The end portion of the end segment 1A is fixed to the support portion 47 of the end portion fixing jig 28 by a bolt 57, but the other configuration is the above-described first configuration. This is the same as the embodiment. In such a configuration, the end fixing metal fitting 28 is not disposed so as to protrude from the segment 1A to the inner space side of the tunnel, so that no dead space is generated on the inner space side of the tunnel and the appearance of the inner space side of the tunnel can be improved.

  In the embodiment shown in FIG. 24, the end fixing bracket 28 has a substantially U-shaped cross section, and the end segment 1A is a bolt, and the end fixing jig 28 is the same as that of the first embodiment. However, other configurations are the same as those of the first embodiment. In this embodiment, the end fixing bracket has a substantially U-shaped cross section, and the entire structure is disposed on the back surface of the segment 1A. Since the end fixing bracket 28 does not protrude toward the direction opening, the dead space on the inner side of the tunnel and the side of the tunnel circumferential opening is reduced, and the aesthetics can be improved.

  As shown in the first embodiment and the other embodiments of the end fixing bracket 28, the end fixing bracket 28 has a base portion 45 fixed to the inner wall of the tunnel and is provided integrally with the base portion 45. A vertical portion 46 that is in contact with the end portion 26 on the opening side of the segment 1A adjacent to the opening 23, and is provided integrally with the vertical portion 46 to support the end portion 26 on the opening side of the segment 1 If the support portion 47 is provided, or if it is fixed to the support portion 47 with a bolt 57, the displacement movement of the end segment 1A in the tunnel circumferential direction can be restricted. The detailed configuration such as the detailed shape of the metal fitting 28 may be determined by design as appropriate.

 Next, a second embodiment will be described with reference to FIG. FIG. 25 is a diagram (similar to FIGS. 2, 23, and 24) showing the end fixing structure of the first embodiment. In this embodiment, the vertical portion 46 of the end fixing bracket 28 (however, the support portion 47 is omitted) similar to that of the first embodiment is integrated with the segment 1A in advance by welding or the like at the end of the segment 1A. The support part 47 is omitted. In this manner, the end fixing bracket 28 can be attached to the segment 1A itself. In this embodiment, a simple structure that does not require a separate and independent end fixing bracket 28 can be achieved simply by providing the vertical portion 46 and the base portion 45 in the segment itself. Further, the movement of the segment 1A at the end on the opening side can be prevented by the segment 1A itself, and further, the inner surface of the tunnel can be prevented from being displaced by the strong protection of the inner surface of the tunnel. A reinforcing structure can be used. Further, since the end fixing bracket 28 is not separately provided on the inner space side of the segment 1A adjacent to the opening, the dead space on the inner space side of the tunnel is reduced, and the aesthetics can be improved. Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

Next, a tunnel inner surface protection / reinforcement structure according to a third embodiment of the present invention and the illustrated segment 1A used in the structure will be described with reference to FIGS. 5 to 7 and FIG. In these drawings, the segment main body 2 and the connecting arms 52 and 53 are mainly shown, and other equipment attached to the segment main body 2 is the same as that of the above-described embodiment (however, the jigs 16 and 20 are unnecessary). Therefore, these are omitted.
This segment main body 2 for protecting and reinforcing the inner surface of the tunnel is the same segment main body 2 as in the conventional case. The difference will be mainly described. The segment 1A is located on the side of the opening 23 in the tunnel circumferential direction. The connecting arm 52 is arranged so as to extend in the tunnel axis direction parallel to the side 25 forming the tunnel axis direction, and the base end portion of the connecting arm 52 is fixed to the back surface of the segment body 2 by welding W. Has been. A bolt insertion hole having an axis in the circumferential direction of the tunnel is provided at the distal end of the connection arm 52, and a female screw member 54 made of a nut concentrically with the bolt insertion hole is provided in the opening 23 in the connection arm 52. It is fixed to the surface opposite to the side surface by welding or the like.

  Further, in the segment 1 adjacent to the segment 1A in the tunnel axis direction, a connecting arm 53 extending in the tunnel axis direction so as to engage with the connecting arm 52 is extended to the back side of the segment 1A. A bolt insertion hole having an axial line in the circumferential direction of the tunnel is provided at the tip of the connection arm 53 so as to match the bolt insertion hole of the connection arm 52. These connecting arms 52 and 53 may be provided on the back surface of the segment body 2 at the site.

  The connecting arms 52 and 53 are provided on the back surface of the segment 1A adjacent to the opening 23 and the back surface of the segment adjacent to the segment 1A in the tunnel axis direction, and these connecting arms 52 and 53 are connected to each other. A fitting 55 such as a bolt is fixedly connected to the female screw member 54 while being inserted into the bolt insertion hole, and the opening side end portion 26 of the segment 1A adjacent to the opening 23 in the tunnel circumferential direction is adjacent to the tunnel axial direction. This is a form in which the arch to be locked is locked to the segment 1 in the segment ring 7 to prevent the segment 1A from shifting in the circumferential direction of the tunnel, and the tunnel inner surface protection / reinforcement structure is made stronger. .

  The connecting arm 52 may be a male connecting arm that protrudes in the tunnel axis direction from the back surface of the segment 1A, or as shown in the figure, the segment arm 52 does not protrude from the back surface of the segment body 2 in the tunnel axis direction. It may be configured to fit within the back surface. That is, the connecting arms 52 and 53 may be connecting arms protruding from one or both of the segments 1A (1) adjacent in the tunnel axis direction.

  As in the first embodiment, the embodiment in which the width in the tunnel axis direction is the opening 23 for one segment is shown. However, as shown in FIG. When it is necessary to provide the opening 23 over the ring width or 3 ring width (in the case of illustration), the arc-shaped segment ring 7c formed by being divided is equivalent to 2 rings or 3 rings or more in the tunnel axis direction. Therefore, in such a case, the segments 1A are adjacent to each other in the tunnel axis direction, and therefore the connecting arms 52 and 53 may be appropriately combined between the adjacent segments 1A.

FIG. 8 shows a tunnel inner surface protecting / reinforcing structure according to a fourth embodiment of the present invention. FIG. 8 is a schematic perspective view.
In this embodiment, the opening-side end portions 26 of the arcuate sides 4 and 5 forming the tunnel circumferential direction in the segment 1A adjacent to the opening 23 in the tunnel circumferential direction form the tunnel circumferential direction in the segment 1 adjacent to the tunnel axis direction. Fixed to the sides 4 and 5 by welding W that is continuous in the tunnel circumferential direction, the ends on the opening side in the arc-shaped sides 4 and 5 that form the tunnel circumferential direction of the segment 1A adjacent to the opening 23 are fixed, The segment 1A is prevented from shifting in the circumferential direction of the tunnel, whereby the arc-shaped segment ring 7c including the segment 1A is prevented from shifting in the circumferential direction of the tunnel. The length of the continuous weld W in the tunnel circumferential direction is set by design.

  The welding of the opening side end portion 26 of the segment 1A adjacent to the opening 23 is fixed to the inner side of the tunnel by welding W continuous from the back side of the segment when the segment 1A is installed along the inner surface of the tunnel. From the viewpoint of reducing the surface finishing treatment after welding or as much as possible, it is preferable to the case where the welding is performed by continuous welding.

  Similarly to the above embodiment, when the opening 23 has two or three rings in the tunnel axis direction, the tunnel circumferential direction of the adjacent segment 1A is shown in FIG. The sides 4 and 5 may be fixed by welding continuously in the circumferential direction of the tunnel on the opening end side. Further, the side 4 (5) forming the circumferential direction of the tunnel at the opening side end of the segment 1A located at the end of the opening 23 in the tunnel axis direction is continuously welded to the segment 1 in the segment ring 7 that is not divided by the opening. By fixing with W, it is possible to prevent the segment 1A located in all the openings 23 from shifting in the tunnel circumferential direction, and to prevent the arc-shaped segment ring 7c at that portion from shifting in the tunnel circumferential direction. be able to.

  In addition, although illustration is abbreviate | omitted, the sealing material for water stop is suitably fixed to the surrounding side surface part (front-and-rear surface and left-right side surface of the main body 2 of FIG. 1b) of the rectangular segment main body 2 shown in each figure, Adjacent segments in the tunnel axial direction or the tunnel circumferential direction are brought into close contact with each other, and water-stopping connection between the segments is achieved.

  The embodiments of the present invention may be combined to prevent the displacement of one or more segments 1A or segment rings 7c in the tunnel axis direction in the tunnel circumferential direction.

  Also in the second embodiment, the third embodiment, and the fourth embodiment, an example of the staggered segment is shown. However, the segment arrangement in the present invention does not assume the staggered segment, and the segment is a splice. As in the first embodiment, the segment may be divided only in the tunnel axis direction and may not be divided in the tunnel circumferential direction.

  In each of the above-described embodiments, as the tunnel inner surface protecting / reinforcing segment, an arm-type joint member (shear key 3) in the form of protruding so as to engage with the back surface of the segment adjacent in the tunnel axial direction is shown. When implementing the present invention, although not shown in the drawings, the present invention can be applied to other appropriate plate-like segments not provided with the joint member as described above. It is possible to cope with displacement movement in the tunnel circumferential direction or the like in the segment located in the opening or the arc-shaped segment ring when assembling the segment such as a form in which the bolt is fixed by bolt or welding.

  In the illustrated embodiment, the form of an automobile tunnel is shown. However, when the present invention is implemented, the tunnel inner surface may be repaired or reinforced by applying it to a railway tunnel or other tunnels.

  The material constituting the segment 1 (1A) for protecting and reinforcing the inner surface of the thin-walled plate inner surface is, for example, a thick steel plate having a thickness of 30 mm or less so as not to exceed the building limit on the sky side in the tunnel. , FRP plate material, cast steel face plate material, and the like. In the case of a segment FRP plate-like material, although not shown in the drawing, means for bolting may be adopted by appropriately interposing an attachment plate or the like instead of welding.

FIG. 2 is an exploded plan view (upper side) showing a fixing structure of an opening side end portion of a segment adjacent to the opening in the tunnel inner surface protection / reinforcement structure of the present invention, and a front view (lower side) viewed from the tunnel axis direction. FIG. It is a figure which shows the fixing structure of the opening side edge part of the segment adjacent to the opening part in the tunnel inner surface protection and reinforcement structure of 1st Embodiment of this invention, (a) is the segment of one side (left side edge part) of an opening part The longitudinal front view which shows the fixing structure of an edge part, (b) is a longitudinal front view which expands and shows a part of (a). It is the perspective view which takes out and shows the edge part stopper metal fitting used in 1st Embodiment, (a) is the perspective view seen from the front direction, (b) is the perspective view seen from the back direction. FIG. 2 is an expanded plan view showing a part of FIG. 1 in an enlarged manner. It is a top view which shows the state which expand | deployed the fixing structure of the opening side edge part of the segment adjacent to the opening part in the tunnel inner surface protection and reinforcement structure of 3rd Embodiment of this invention seeing from the tunnel back surface side. (A) is a partial cross-sectional top view which expands and shows a part of FIG. 5, (b) is a side view of (a). The modification of 3rd Embodiment is shown, Comprising: (a) is a partial cross section top view, (b) is a side view of (a). (A) is a perspective view which shows the fixing structure of the opening side edge part of the segment adjacent to the opening part in the tunnel inner surface protection and reinforcement structure of 4th Embodiment of this invention, (b) It is the vertical side view. The tunnel inner surface protection / reinforcing segment of the first example used as a segment adjacent to the opening in the present invention is shown, wherein (a) is a plan view and (b) is a front view. In the present invention, a tunnel inner surface protecting / reinforcing segment of a second example used as a segment adjacent to an opening is shown, wherein (a) is a plan view and (b) is a front view. The plane which shows the deformation | transformation form of 1st Embodiment of this invention, Comprising: The state which expand | deployed seeing the fixing structure of the opening side edge part of the segment adjacent to the opening part in a tunnel inner surface protection and reinforcement structure from the tunnel back surface side. FIG. The plane which shows the deformation | transformation form of 3rd Embodiment of this invention, Comprising: The state which expand | deployed seeing from the tunnel back surface side the fixing structure of the opening side edge part of the segment adjacent to the opening part in a tunnel inner surface protection and reinforcement structure FIG. The plane which shows the deformation | transformation form of 4th Embodiment of this invention, Comprising: The state which expand | deployed the fixing structure of the opening side edge part of the segment adjacent to the opening part in a tunnel inner surface protection and reinforcement structure seeing from the tunnel back surface side. FIG. It shows one form of the segment for tunnel inner surface protection and reinforcement, (a) is a top view, (b) is a front view. 14A is a sectional view taken along line AA in FIG. 14A, FIG. 14B is a sectional view taken along line BB in FIG. 14A, and FIG. 14C is a sectional view taken along line CC in FIG. It is. It is a development top view showing the state where the tunnel inner surface protection and reinforcement structure is built along the tunnel inner surface with the tunnel inner surface protection and reinforcement segment. (A) is a schematic longitudinal front view which shows the state which has constructed | assembled the segment ring structure by the segment of protection and reinforcement, (b) is a front view which shows the fixing structure of the lower part of a lower end part segment. It is explanatory drawing in case a segment ring is parted in the tunnel circumferential direction by the existing installation. It is an example of the segment which can be used as another form of the segment main body of this invention. It is an example of the segment which can be used as another form of the planar shape of the segment main body of this invention. It is the schematic which shows the example of a splice structure as another example other than the zigzag ring of 1st Embodiment of this invention, (a) Diagram of a developed view, (b) Sectional drawing of a segment, (c) It is a top view. It is the schematic which shows the example of the structure comprised by 1 sheet / 1 ring as other examples other than the zigzag ring of 1st Embodiment of this invention, (a) Diagram of developed view, (b) Section of segment (C) It is a top view of a segment. It is a figure showing the other example of 1st Embodiment of this invention, and is a figure which shows the fixation structure of the opening side edge part of the segment adjacent to the opening part in a tunnel inner surface protection and reinforcement structure, (a) is an opening part Fig. 5B is an enlarged vertical front view showing a fixing structure of one segment (left end portion) of Fig. 5B, Fig. 5B is an enlarged vertical front view showing a part of Fig. 5A, and Fig. 5C is one of Fig. 5B. It is a figure which expands and shows a part. It is a figure showing the further another example of 1st Embodiment of this invention, and is a figure which shows the fixation structure of the opening side edge part of the segment adjacent to the opening part in a tunnel inner surface protection and reinforcement structure, (a) is an opening. FIG. 4 is an enlarged longitudinal sectional front view showing a fixing structure of a segment end of one of the parts (left end), and (c) is an enlarged view of a part of (b). It is a figure which shows the fixing structure of the opening side edge part of the segment adjacent to the opening part in the tunnel inner surface protection and reinforcement structure of 2nd Embodiment of this invention, (a) is a segment of one side (left side edge part) of an opening part The enlarged longitudinal front view which shows the fixing structure of an edge part, (b) is a longitudinal front view which expands and shows a part of (a).

Explanation of symbols

1 Tunnel lining inner surface protection / reinforcement segment 1A Tunnel lining inner surface protection / reinforcement segment 2 Tunnel lining inner surface protection / reinforcement segment body 3 Shear key (shear key for connecting adjacent rings, segment Shear key provided so as to protrude in the tunnel axis direction with an interval between the arc-shaped sides of
3a Existing side shear key 3b New side shear key 3c Shear key (a shear key for connecting adjacent rings to each other and provided so as not to protrude in the tunnel axis direction with an interval between the arcuate sides of the segments)
4 Existing side arc-shaped side 5 New side arc-shaped side 7 Segment ring 7a not divided by opening Existing side segment ring 7b New side segment ring 7c Arc-shaped segment ring (segment ring divided by opening)
8 Tensile member 9 Female screw hole 10 Tensile screw shaft rod 13 Recessed tool engaging recess 14 Ring fixing jig 15 Inter-segment fixing jig 16 Jig 17 Jig 19 Jig 20 Jig 21 Bolt 22 Inside the tunnel Equipment 23 projecting to the sky side Opening 24 Tunnel side existing side 25 Tunnel side new side 26 Opening side end 27 Opening side end portion 28 End fixing bracket 30 Bracket 33 Nut
34 Concrete floor slab 35 Fixing bracket 36 Arm side 37 Arm side 38 Receiving groove 39 Press bolt 40 Existing lining 41 Inner wall surface 42 Grout 43 Tunnel 44 Anchor material 45 Base part 46 Vertical part 47 Support part 48 Anchor hole 49 Reinforcement rib 50 Bolt insertion hole 51 Nut 52 Linking arm 53 Linking arm 54 Female thread 55 Linkage 56 Shear key (Shear key for connecting adjacent segments in the tunnel circumferential direction. Shear key provided so as to protrude in the tunnel circumferential direction. )
57 Bolt 58 Female threaded hole (End fixing bracket 28 side)
59 Female threaded hole (segment side)
60 Recessed tool engaging recess 61 Metal frame 62 Metal face material 63 Reinforcement rib 64 Convex part 65 Concave part

Claims (8)

  To avoid equipment that protrudes toward the inner surface of the tunnel in a tunnel inner surface protection / reinforcement structure that protects / reinforces the inner surface of the tunnel by installing at least plate-like segments divided in the tunnel circumferential direction along the inner surface of the tunnel In each arc-shaped segment ring divided in the tunnel circumferential direction across the opening, the end of the segment adjacent to the opening on the opening side is divided in the tunnel circumferential direction adjacent to the tunnel inner wall surface in the tunnel axial direction. A tunnel inner surface protecting / reinforcing structure characterized in that it is fixed to at least one of the non-segment ring by a fixing means and the displacement movement of the segment adjacent to the opening in the tunnel circumferential direction is restricted.   To avoid equipment that protrudes toward the inner surface of the tunnel in a tunnel inner surface protection / reinforcement structure that protects / reinforces the inner surface of the tunnel by installing at least plate-like segments divided in the tunnel circumferential direction along the inner surface of the tunnel Each arc segment ring divided in the tunnel circumferential direction across the opening is fixed to the segment ring adjacent to the tunnel axis direction and not divided in the tunnel circumferential direction, so that each arc segment ring is displaced in the tunnel circumferential direction. Tunnel inner surface protection / reinforcement structure characterized by restricted movement.   An end fixing bracket is used as a fixing means for the opening side end of the segment adjacent to the opening, and the end fixing bracket is provided integrally with the base fixed to the inner wall of the tunnel and the base. An end portion provided with a vertical portion that contacts an end portion of the segment adjacent to the opening portion, and a support portion that is provided integrally with the vertical portion and supports the end portion of the segment on the opening portion side. The tunnel inner surface protection / reinforcement structure according to claim 1, wherein the tunnel inner surface protection / reinforcement structure is a fixing bracket.   A segment adjacent to the opening in the circumferential direction of the tunnel and a segment in the segment ring adjacent to the tunnel axial direction and not divided in the circumferential direction of the tunnel are connected to each of the connecting arms and the connecting arms provided on the back side of the segments. The tunnel inner surface protecting / reinforcing structure according to claim 1, wherein the tunnel inner surface protecting / reinforcing structure is fixed by a fixing tool for fixing each other.   In the arc segmented ring that is divided in the tunnel circumferential direction across the opening, the end on the opening side of the side that forms the tunnel circumferential direction in the segment adjacent to the opening is welded or bolted to the segment ring adjacent in the tunnel axial direction The tunnel inner surface protecting / reinforcing structure according to claim 1 or 2, wherein the tunnel inner surface protecting / reinforcing structure is fixed by means for joining.   An end fixing bracket is used as a fixing means for the opening side end of the segment adjacent to the opening, and the end fixing bracket is provided integrally with the base fixed to the inner wall of the tunnel and the base. And an end fixing bracket that is provided integrally with the vertical portion and has a support portion that is in contact with the back of the end portion on the opening side of the segment, and the end portion on the opening side of the segment is The tunnel inner surface protection / reinforcement structure according to claim 1, wherein the tunnel inner surface protection / reinforcement structure is fixed to the support portion with a bolt.   An end fixing bracket is used as a fixing means for the opening side end of the segment adjacent to the opening, and the end fixing bracket is provided integrally with the base fixed to the inner wall of the tunnel and the base. An end fixing bracket having a substantially U-shaped cross section having a vertical portion and a support portion that is provided integrally with the vertical portion and is in contact with the back surface of the end portion on the opening side of the segment. The tunnel inner surface protection / reinforcement structure according to claim 1, wherein an end of the opening is fixed to the support by a bolt.  A vertical portion extending toward the inner wall surface of the tunnel is integrally provided at an end portion of the segment main body adjacent to the opening in each arc segment ring divided in the circumferential direction of the tunnel, and is integrated with the vertical portion. A base portion extending toward the opening in the circumferential direction of the tunnel is provided, and the base portion is fixed to the inner wall of the tunnel by fixing means, so that displacement of the segment adjacent to the opening in the circumferential direction of the tunnel is restricted. The tunnel inner surface protecting / reinforcing structure according to claim 1, wherein:

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