JP2006291652A - Tunnel inner surface protecting/reinforcing segment, tunnel inner surface protecting/reinforcing structure and construction method for protecting/reinforcing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel inner surface protecting/reinforcing segment capable of efficiently reinforcing and constructing a tunnel inner surface, a tunnel inner surface protecting/reinforcing structure and a construction method of a protecting/reinforcing structure using the segment. <P>SOLUTION: This tunnel inner surface protecting/reinforcing segment is arranged in zigzag arrangement along the tunnel inner surface. The tunnel inner surface protecting/reinforcing segment 1A is arranged so that a female type shear key in a second segment combined with a first segment arranged so that a male type shear key overhangs in the tunnel axis direction from a segment reverse surface, that is, the second segment engaging with the male type shear key being an inter-ring joint of the first segment, is stored in a reverse surface of the second segment so as not to overhang to the opposed first segment reverse surface. The tunnel inner surface protecting/reinforcing structure is formed by interposing the segment 1A having the female type shear key 6 in a connecting part of mutual circular arc-shaped arch parts, and is constructed by continuing the circular arc-shaped arch parts in the tunnel axis direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a repair / reinforcement structure against concrete peeling or tunnel deformation on the inner surface of a tunnel, and in particular, prevents the lining concrete from collapsing / falling in an old or healthy existing tunnel. , Even if the lining concrete is peeled off, the purpose is to protect the peeled pieces from falling into the tunnel and to reinforce against deformation due to loosening of the natural ground or external pressure such as plastic pressure The present invention relates to a protective structure for the inner surface of an existing tunnel, and more particularly to a segment for protecting and reinforcing a road tunnel inner surface, a tunnel inner surface protective and reinforcing structure, and a method for constructing the protective and reinforcing structure.

  It is known to construct a protection / reinforcement structure for the inner surface of the tunnel by assembling thin segments on the inner surface of the tunnel for each ring (meaning arch ring) in a staggered manner (for example, Japanese Patent Application Laid-Open No. 2004-150072 [ Patent Document 1]). Such a protective / reinforcing structure for the inner surface of the tunnel using a thin segment is characterized in that it is a thin structure that does not protrude to 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 to perform construction 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, lining concrete etc. are prevented from collapsing / peeling, and even if concrete etc. collapsible, they will fall off in the tunnel. Tunnel lining inner surface repair / reinforcement structure and its construction method and its construction method, which are intended to protect against falling, and to reinforce against deformation due to loosening of natural ground or plastic pressure Regarding the segment, the present applicant has previously proposed as Japanese Unexamined Patent Application Publication No. 2004-150072 (Patent Document 1).

  The contents of Japanese Patent Application Laid-Open No. 2004-150072 will be described with reference to FIGS. 16 to 25. As shown in FIGS. 16 to 18, the circumferential direction of the tunnel in a substantially rectangular plate-shaped repair / reinforcement segment (hereinafter referred to as a segment) 1 is formed. As a joint material for connecting the segment rings 7 adjacent to each other in the tunnel axis direction at a plurality of locations on each side 4 and 5, the shear key 3 is provided so as to project in the tunnel axis direction at intervals in the circumferential direction. Segment 1. (The shear key is a joint material that is provided in a segment and transmits at least the shearing force in the tunnel radial direction to the adjacent segment. The segments connected in the tunnel axial direction or the tunnel circumferential direction are sheared, and at least the tunnel radius. (The shear force in the direction is connected so that it can be transmitted.)

  Further, as shown in FIG. 24 and FIG. 25, the segments adjacent to each other in the tunnel circumferential direction are connected to both or one of the sides 24 and 25 forming the tunnel axis direction in the repair / reinforcement segment 1. As a joint material, a shear key 52 is provided so as to project in the circumferential direction of the tunnel at intervals in the tunnel axis direction, and such a tunnel lining inner surface repair / reinforcement segment 1 is arranged along the tunnel lining inner surface. Each segment ring adjacent in the tunnel axis direction is shifted in the circumferential direction of the tunnel and assembled in a staggered manner, and the lower end portion of the segment ring is fixed to the floor slab concrete of the existing tunnel by fixing means.

  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 tunnel circumferential direction (the arcuate circumferential direction of the repair / reinforcement segment body 2).

  Since the shear key 3 (3a) and the shear key 3 (3b) are provided with their positions shifted in the circumferential direction of the tunnel, it is possible to transmit a shearing force in either the positive or negative direction in the tunnel radial direction. It can function as a shearing force transmission member.

  The segment body 2 for repair / reinforcement is provided with a tension member 8, and this member 8 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 in the radial direction of the tunnel toward the back side of the repair / reinforcement segment body 2 and pressing it against the existing tunnel lining inner wall surface 41, thereby continuously connecting the segment 1 in series in the circumferential direction. The segment arch ring 7 (hereinafter also simply referred to as the segment ring 7) acts to reduce the diameter in the tunnel radial direction, so that axial force is introduced to the repair / reinforcement segment ring 7 in the tunnel circumferential direction. It restrains deformation of the shape of the arch by the ring and stabilizes the arch. At the proximal end portion of the tension screw shaft 10 on the inner side of the tunnel, a turning tool engaging recess 13 is provided.

  Further, as shown in FIG. 16 (or FIGS. 19 to 21), the front side (existing side) of the tunnel circumferential direction at both ends in the tunnel axial direction (front-rear direction) on the back surface of the repair / reinforcement segment body 2 is provided. Inter-ring fixing 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) in the vicinity of the arc-shaped side 4 and the arc-shaped side 5 on the rear side (newly installed side). Jigs 16 and 17 for the jig 14 (see FIG. 19) and a segment fixing jig 15 in the circumferential direction for connecting and fixing the segments 1 adjacent to each other in the tunnel circumferential direction in the same segment ring 7 (see FIG. 19) Jigs 19 and 20 are provided.

  End members for supporting each segment 1 located at the lower end (left end, right end in FIG. 22) on both ends (see FIG. 22a) of the segment ring 7 (7a, 7b) constructed sequentially in the tunnel axis direction A fixing bracket 35 is installed on the concrete floor slab 34.

  For example, as shown in FIG. 22B, the fixture 35 is a fixture 35 having a receiving groove 38 formed by a pair of arm pieces 36 and 37 and extending upward in the tunnel axis direction. In the receiving groove 38 of 35, the end repairing / reinforcing segment 1 is arranged at an interval on the inner surface of the existing lining 40, and its lower end is attached to the fixing bracket 35 having the receiving groove 38 as required. The lower end of the segment 1 at the lower end is adjusted by adjusting the pressing bolt 39 screwed into one of the arm pieces 36 on the inner side of the tunnel in the fixing fitting 35 having the receiving groove 38 as appropriate. It 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. 19 to FIG. 21, 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, or It is arranged on the new side of the already installed 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. The segments 1 adjacent to each other are connected and fixed to each other.

  19 to 21, the tunnel inner surface repair / reinforcement segment 1 is assembled in a staggered manner in the segment ring 7 adjacent in the tunnel axial direction, and the lower end is fixed to the concrete of the existing tunnel by fixing means. The inner surface repair / reinforcement structure can transmit shearing force and bending moment by engaging 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. Since the shear key 52 protruding so as to project in the circumferential direction can be used as a tunnel lining inner surface repair / reinforcement structure that can be engaged with the rear surface of the adjacent segment in the circumferential direction of the tunnel and transmit shearing force. Even if the concrete peels off the inner wall of the tunnel and a load is applied to the segments, Shear force or bending moment, or by transmitting the axial force of the tunnel circumferential direction is dispersed in the entire structure can be supported, it can be a stable repair and reinforcement structure.

  Further, when an appropriate segment ring 7 is constructed in the tunnel axial direction, the grout 42 (see FIG. 23) directly on the back surface of the segment ring 7 or on the grout bag from the segment 1 previously provided with the grout injection hole in the segment body 2. When the reference ring is filled, the segment ring 7 and the existing lining inner surface 41 are brought into close contact with each other, and the deformation of the segment 1 toward the existing lining surface 41 is restrained, and the segment ring 7 has a high-strength and high-rigidity reinforcing structure. Can do.

Further, it is also known that when a shear key 52 protruding in the circumferential direction of the tunnel is provided in the segment as described above, a shearing force can be transmitted to a segment adjacent in the circumferential direction of the tunnel.
JP2004-150072

  However, if the repair / reinforcement structure using the segment is applied to a road tunnel, the repair / reinforcement structure using the segment is a staggered group. Regulations, heavy equipment, relocation of segment installation space, etc. must be carried out every half ring. Every time a full road closure is required, so a full road closure is required every time one-side alternate traffic is switched, resulting in a significant reduction in construction efficiency, a long construction period, and high construction costs. In addition, there is a problem that road traffic becomes a major obstacle.

  On the other hand, in the existing construction method / segment structure with only a male shear key projecting in the tunnel axial direction, the remaining half rings are assembled after the entire length to be constructed in the tunnel axial direction is approximately half a ring. If you try to assemble a new zenith segment to construct the zenith, because the segments are staggered, the connecting portion of the zenith on the existing side protrudes in the tunnel circumferential direction and the recessed portion in the tunnel axial direction As a result, the concave and convex connection portions were alternately formed, and it was difficult to insert a new segment for the zenith portion connected to the concave connection portion, resulting in poor workability.

  In order to avoid this, it is possible to adopt a relay structure in which only the tunnel zenith part has a straight joint structure in the tunnel axis direction, but unlike the staggered arrangement, the straight joint in the tunnel axis direction. The part became a weak point in structure, and there was a problem that the reinforcing effect of the joint part was lowered.

  The present invention advantageously solves the above-mentioned conventional problems, and can efficiently reinforce the inner surface of the tunnel without reducing the reinforcement effect and in a state where alternate traffic is possible in a part of the road width direction such as alternate traffic on one side. An object of the present invention is to provide a tunnel inner surface protection / reinforcement segment, a tunnel inner surface protection / reinforcement structure using the segment, and a construction method of the protection / reinforcement structure.

  In order to advantageously solve the above-mentioned problems, the present invention provides a tunnel inner surface protecting / reinforcing segment according to the first aspect, in which a thin segment divided in the tunnel circumferential direction and the tunnel axial direction is formed on the tunnel lining inner surface. Tunnel inner surface protection used to create a tunnel inner surface protection / reinforcement structure that protects and reinforces the inner surface of the tunnel by installing each segment ring adjacent to the tunnel axis along the tunnel circumferential direction in a staggered pattern -In the reinforcing segment, shear key is circumferentially connected to the back side of the segment as a joint material for connecting segment rings adjacent to each other in the tunnel axis direction at multiple locations on each side of the plate-shaped segment body in the circumferential direction of the tunnel Assembling paired with the first segment provided to project in the tunnel axis direction at intervals The second segment is a shear key in the second segment which is a segment ring joint that engages with a shear key that is a ring joint provided so as to project in the tunnel axis direction of the first segment. It is provided so that it may fit in the back surface of the said 2nd segment so that it may not protrude in the tunnel axial direction on the back surface of said 1st segment which opposes.

  In the second invention, in the tunnel inner surface protecting / reinforcing segment according to the first invention, the second segment back surface protrudes in the tunnel axis direction on the back surfaces of two segments adjacent to each other in the tunnel axis direction. A plurality of female shear keys for fitting male shear keys to be ring joints provided on the base are provided, and each female shear key includes a leg portion having a base end fixed to the segment back surface, It is characterized in that an arm portion is provided at the distal end portion of the leg portion so as to extend in the tunnel circumferential direction or the axial direction in a state of being separated from the rear surface of the segment.

  In the third invention, in the tunnel inner surface protecting / reinforcing segment of the first invention or the second invention, the female shear key in the second segment protrudes in the tunnel axial direction on the back surface of the first segment. Inverted L-shape that becomes a ring joint provided so as not to protrude in the tunnel axis direction on the back surface of the second segment in parallel with the male shear key made of a rod-like member or plate-like member that becomes a provided ring joint It is a female-type shear key.

  In the fourth invention, in the tunnel inner surface protecting / reinforcing segment of the first invention or the second invention, the female shear key in the second segment protrudes in the tunnel axial direction on the back surface of the first segment. Inverted L-shape that forms a ring joint that has an arm part that engages at right angles with a rod-shaped or plate-shaped male sheer key that forms a ring joint, and that does not protrude in the tunnel axis direction on the back of the segment It is characterized by being a female sheer key in shape.

  In the fifth invention, in the tunnel inner surface protecting / reinforcing segment of the third or fourth invention, on the lower surface of the arm portion of the inverted L-shaped female sheer key to be a ring joint, toward the back side. An inclined surface that gradually approaches the rear surface of the segment is provided.

  In the sixth invention, in the tunnel inner surface protecting / reinforcing segment of any one of the first to fifth inventions, from the tip of either or both sides along the tunnel circumferential direction in the second segment. A taper-shaped guide portion is provided toward the center.

In the tunnel inner surface protecting / reinforcing structure of the seventh invention, the thin-walled segments divided in the tunnel circumferential direction and the tunnel axial direction are staggered along the tunnel inner surface for each segment ring adjacent in the tunnel axial direction. In the tunnel inner surface protection / reinforcement structure that protects and reinforces the tunnel inner surface by installing in pairs, the tunnel inner surface protection / reinforcement segment of any one of the first to sixth inventions is provided for tunnel inner surface protection / reinforcement. The arc-shaped arch portion constituting the arch ring is used as a connecting portion between the arc-shaped arch portions and is used as one end segment in the connecting portion between the arc-shaped arch portions adjacent to each other in the circumferential direction. Is assembled in the circumferential direction of the tunnel.
The arcuate arch portion is defined as a plurality of segments assembled in the tunnel circumferential direction.

In the tunnel inner surface protecting / reinforcing structure construction method according to the eighth aspect of the present invention, the thin segment divided in the tunnel circumferential direction and the tunnel axial direction is divided into each segment ring adjacent to the tunnel axial direction along the tunnel inner surface. In a tunnel inner surface protection / reinforcement method that protects and reinforces the inner surface of the tunnel by installing it in a staggered pattern in the tunnel circumferential direction, multiple segments that are part of the arch ring are assembled in the tunnel circumferential direction. Are continuously assembled in the tunnel axis direction to form a tunnel axis direction continuous arc arch portion, and the tunnel axis direction continuous arc arch portion is constructed in advance, and the tunnel axis direction continuous arc arch portion is constructed. And a tunnel axial direction continuous arc-shaped subsequent arch portion connected to and constructed later in the circumferential direction of the tunnel, The tunnel axial direction continuous arch is constructed by using the tunnel inner surface protecting / reinforcing segment according to any one of the first to sixth aspects of the invention in the connection part between every other arc arch part in the tunnel axial direction. And
In addition, the said tunnel axial direction continuous arc-shaped arch part is defined as the said arc-shaped arch part being continuously assembled in the tunnel axial direction.

  According to the first invention, since the shear key provided on the back surface of the second segment is provided so as not to protrude in the tunnel axis direction, the first segment is arranged in a staggered manner and is 1/4 of the tunnel circumferential direction. Incomplete arc-shaped arch ring in the middle of construction of arch or half-arch, etc., in the middle of the tunnel axis (continuous arc-shaped arch in the tunnel axial direction) It can be a tunnel inner surface protecting / reinforcing segment that can be easily connected to the connecting part later, and if the second segment is installed first, the male shear key Can be easily installed, so that the segment arrangement is staggered in the tunnel axis direction, and 1/4 arch or 1/2 arch, etc. By constructing an appropriate arc-shaped arch continuously in the tunnel axis direction, the lane change can be significantly reduced compared to the case of the first segment with only a male-type shear key. In addition, traffic obstacles can be remarkably reduced, and the construction period and construction cost can be significantly reduced. Further, even if the first segment adjacent in the tunnel axis direction has a male type shear key that projects from the segment main body to the tunnel axis direction new side, it can be easily combined with the male segment of the second segment. It can be combined at a predetermined position on the inner surface of the tunnel.

  Further, even if the second segment having the female sheer key of the present invention is used for the connecting portion of the uneven portion at the circumferential end of the tunnel arc direction continuous arc arch ring in the middle of the arch ring construction, the tunnel axis direction Even when a first segment having a male shear key that is adjacent to the segment and protrudes in the tunnel axis direction from the back surface of the segment is incorporated later, the same effect as described above can be obtained. Accordingly, in the construction method in which the second segment having the female shear key adjacent in the tunnel axis direction is assembled after the first segment having the male shear key extending in the tunnel axis direction is installed, or Since the second segment having the female-type shear key is installed, the first segment having the male-type shear key that projects in the tunnel axis direction adjacent to the tunnel axis direction may be assembled later. Can increase the degree of freedom. In addition, after building the arch ring composed of the segments, by filling the grout material composed of a curable filler over time between the existing lining and the arch ring, a peeling load due to the collapse of the existing concrete lining, etc. The arch structure can withstand

  According to the second aspect of the present invention, it is possible to provide a tunnel inner surface / protection correction segment having a female shear key that engages with each male shear key of a plurality of segments constituting a segment ring adjacent in the tunnel axis direction, In addition, it is possible to easily engage with an existing segment using this, and a leg portion is provided on the back surface of the segment, and a female provided so as to extend in the tunnel circumferential direction or the axial direction at the tip thereof. A segment with a type shear key can be used for arching by engaging at least the tunnel radial engagement with the male shear key of the adjacent segment in the tunnel axial direction or the tunnel axial engagement with this. It is possible to transmit the shearing force in the tunnel radial direction to transmit the applied load to the adjacent arch ring. It can be effective.

  According to the third invention, since the male shear key in the first segment adjacent in the tunnel axis direction and the female shear key in the second segment adjacent to the first segment are parallel, When the female shear key of the second segment is assembled to the shear key of the segment, the male shear key on the existing side and the female shear key can be overlapped at the same position, and the shear radial in the tunnel can be passed through the shear key. Can transmit power. In addition, since the existing male shear key and the female shear key can be overlapped at the same position, the portion occupied by the second segment back surface by the existing shear key fits in the portion of the own female shear key. Since no dead space is generated on the back surface of the second segment, the degree of freedom of the installation position when an attachment device is installed on the back surface of the second segment can be increased.

  According to the fourth aspect of the present invention, the arm has an arm portion that engages at right angles with a rod-shaped or plate-shaped male sheer key that becomes a ring joint provided so as to project in the tunnel axis direction on the back surface of the first segment, and the segment Since it is an inverted L-shaped female shear key that becomes a ring joint provided so as not to project on the back surface in the tunnel axis direction, the shear key of the shear key that projects in the tunnel axis direction of adjacent segments to be combined Even if the mounting position is slightly deviated, the shearing force in the tunnel radial direction can be reliably transmitted by being surely engaged by the female shear key, and the existing segment can be easily manufactured.

  According to the fifth aspect of the invention, since the inclined surface that gradually approaches the rear surface of the segment toward the back side is provided on the lower surface of the arm portion of the inverted L-shaped female shear key, the female shear key is inclined. The lower surface of the male sheer key that engages with this is surely guided to the back of the narrow groove, and the male sheer key and female sheer key are securely engaged to ensure shearing force in the tunnel radial direction. Thus, the assembly work of the segments becomes easy. Further, it is possible to obtain an arch structure having high strength and rigidity by eliminating rattling after assembling the segments.

  According to the sixth aspect of the invention, since the tapered guide portion is provided from the tip portion of one or both sides along the tunnel circumferential direction of the segment toward the center, the tunnel circumferential direction is adjacent to the existing segment. When the segments are inserted and installed, the segments can be inserted and installed without being interlinked with each other and easily guided by the tapered guide portion.

  According to the seventh invention, since any one of the segments of the first to sixth inventions is used as one end segment in the connection part between the arcuate arch parts, it can be easily and reliably added to the existing arch part. It can be connected in the tunnel circumferential direction to reliably transmit the shearing force in the tunnel radial direction, or to be a tunnel inner surface protection / reinforcement structure with a connection structure that can transmit the shearing force in the tunnel radial direction and the axial force in the tunnel circumferential direction. In addition, it is possible to obtain a strong joint portion while arranging the segments in a staggered manner without using a saddle joint structure in which the joint portions are linearly arranged in the tunnel axis direction.

According to the eighth aspect of the present invention, a segment having a female shear key is installed between the tunnel axial segments having a male shear key, or a male shear key is interposed between the tunnel axial segments having a female shear key. Can be installed later, while maintaining the staggered arrangement of the segments, it is possible to construct a continuous axial arc arch portion in the tunnel axis direction in the circumferential direction sequentially, and the tunnel axis Because only the part where the continuous arc arch part is constructed is closed, the entire area under the arc arch part where the tunnel continuous axial arc arch part in the tunnel is not constructed or under construction It can be a transportable part, i.e. the lane restrictions are only on the lanes where the segments are assembled. Therefore, even during assembly of the segment, the lane is not performed the assembly can car traffic, it is possible on one side alternating way. In addition, it is possible to minimize and minimize the number of lane changes that require full road closure, shorten the construction period, reduce construction costs, and reduce traffic obstacles.

  FIGS. 1 and 2 show a tunnel inner surface protecting / reinforcing segment 1A according to the first embodiment of the present invention used in the vicinity of a connecting portion. The segment 1A includes a tunnel circumferential direction and a tunnel axis. The thin segments divided in the direction are installed in a staggered pattern along the tunnel inner surface for each segment ring adjacent in the tunnel axis direction to protect the inner surface of various tunnels or tunnel linings. A segment used to protect and strengthen the inner surface of a tunnel to be reinforced, and to be newly connected to the end side of an arcuate arch that forms part of a semicircular arch or other segment ring 7 Segment 1A used as a segment for arc tunnel inner surface protection / reinforcement having a cross-sectional arc shape in the circumferential direction of the tunnel and having a substantially rectangular flat plate shape The existing arc side 4 and the new arc side 5 forming the circumferential direction of the tunnel of the tunnel body 2 are provided. Are provided with an inclined arc-shaped side 5a that becomes a tapered guide portion that is gradually narrowed from the center toward the end, and a side 5b that is parallel to the arc-shaped side 4 on the existing side. (In the plan view of the segment main body 2, the existing arc-shaped side 4, the new-side arc-shaped side 5 and the inclined arc-shaped side 5a are all linear sides.) The inclined arc-shaped side 5a is included. When incorporating the segment 1A into the existing segment, the segment 1A can be installed at least as an existing segment.

In the vicinity of the arcuate side 4 on the existing side, a plurality of (four in the illustrated case) female shear keys 6 (6a) are provided in the vicinity of the circumferential direction of the tunnel, and each female shear key 6 is provided. (6a) includes a leg portion 6b fixed to the back surface of the segment body 2, and a tip projecting toward the existing side in the tunnel circumferential direction at the top of the leg portion 6b and at right angles to the tunnel axis (the arcuate side 4 on the existing side). Parallel to the arm portion 6c. The arm portion 6c is separated from the back surface of the segment body 2, and an opening groove 6d that opens toward the existing side in the tunnel circumferential direction is formed by the lower surface of the arm portion 6c, the leg portion 6b, and the back surface of the segment body 2. .
Further, the lower surface of the arm portion 6c forming the opening groove 6d is an inclined surface 6e that is gradually inclined away from the back surface of the segment body 2 from the proximal end side to the distal end side of the arm portion 6c. It is tapered in the insertion direction, and the height dimension on the back side of the opening groove 6d is the same dimension as the height dimension of the shear key fitted therein, and is installed adjacent to the tunnel axis direction. The position of the segment in the tunnel radial direction is prevented from being displaced with respect to the segment, and the shear key 3 (3a) of the segment 1 on the existing side in the tunnel axis direction inserted into the opening groove 6d can be arranged while being guided. . The inclination angle θ (see FIG. 2b) of the inclined surface 6e is set by design in consideration of manufacturing accuracy and dimensional accuracy.

  Further, in the vicinity of the inclined arc-shaped side 5a in the arc-shaped side 5 on the newly installed side, there are a plurality of (2 in the illustrated case) in parallel with the female shear key 6 (6a) on the existing side. Female shear key 6 (6f). Further, in the vicinity of the arcuate side 5b on the new installation side, male shear keys 3 projecting in the tunnel axis direction are provided at a plurality of locations (two in the figure) spaced in the tunnel circumferential direction.

  That is, a female shear key 6 (6a) is provided in the vicinity of the existing side 4 in the tunnel axis direction of the segment main body 2 for protecting and reinforcing the inner surface of the tunnel, and a shear key 3 (3b) is provided in the vicinity of the side 5 on the new side. ) And female shear key 6 (6f). The inclined arc-shaped side 5b may have a slightly smaller segment width if the insertion portion on the existing side into which the segment body 2 is inserted is U-shaped in plan view. The segment main body 2 does not have to be gradually narrowed, and may be substantially rectangular as a whole in plan view.

  In this embodiment, the shear key 3 or the shear key 52 is provided with a short steel plate standing on the back surface of the tunnel inner surface protecting / reinforcing segment body 2 and protruding in the tunnel axial direction or the tunnel circumferential direction. The base end portion of the steel plate body is fixed to the segment main body 2 for protecting and reinforcing the inner surface of the tunnel by welding.

  Next, about the procedure until the tunnel axial direction continuous arc-shaped arch portion used for the end portion for connecting the arc-shaped arch portions to the tunnel inner surface protecting / reinforcing segment 1A of the first embodiment of the present invention is as follows. This will be described with reference to FIGS.

  In the tunnel, the road surface 44 (see FIG. 5B) below the portion where the continuous arc arch portion 46 in the axial direction of the tunnel is to be constructed is blocked, and the road surface 45 on the opposite side is switched to one-way alternating traffic. A fixing jig 35 continuous to an appropriate length is installed on the concrete floor slab 34 so as to be continuous in the tunnel axial direction so as to be continuous in the tunnel axial direction at the end of the direction, and then the fixing bracket 25, a tunnel inner surface protecting / reinforcing segment 1 for an end portion as shown in FIG. 25 or a tunnel inner surface protecting / reinforcing segment 1 for an end portion provided with a shear key 52 projecting in the circumferential direction of the tunnel is prepared. .

  Further, the tunnel inner surface protecting / reinforcing segment 1 as shown in FIG. 16 or the tunnel inner surface protecting / reinforcing segment 1 as shown in FIG. 24 is used for protecting and reinforcing two types of tunnel inner surfaces having different width dimensions in the tunnel axial direction. Prepare segment 1. Since the tunnel inner dimension of the tunnel inner surface protecting / reinforcing segment 1 on the tunnel circumferential end side is the same as the tunnel axial dimension, it belongs to the same tunnel axial width arch. Make sure you can distinguish.

  The two types of tunnel inner surface protecting / reinforcing segments 1 can have the same structure except that the width in the tunnel axis direction is the same as or different from the conventional width. . Alternatively, as shown in FIG. 24, a tunnel inner surface protecting / reinforcing segment 1 having a plurality of male sheer keys 52 protruding in the circumferential direction of the tunnel at intervals in the circumferential direction of the tunnel as shown in FIG. 24 is also used. be able to.

  The width dimension in the tunnel axis direction of the tunnel inner surface protecting / reinforcing segment 1 for the end portion and the adjacent tunnel inner surface protecting / reinforcing segment 1 may be narrower or wider than the other. In some cases, the dimensions may be the same in the tunnel axis direction.

  Referring to FIG. 5, the general assembly order of the segments will be described using the various segments 1 as described above. The tunnel inner surface protection / reinforcement for the end portion is provided at the groove bottom portion of the receiving groove 38 of the fixing bracket 35. In the state where the lower end portion of the segment 1 is placed, it is pressed against the arm side 37 by the pressing bolt 39 in the receiving groove fixing bracket 35 (see FIG. 22b), and then the same tunnel circumference as the fixed segment 1 The circumferential end portions of the tunnel inner surface protecting / reinforcing segment 1 having the arc length in the direction are brought into contact with each other and temporarily held by appropriate supporting means. Moreover, when it has the male type shear key 52 which protrudes in a tunnel circumferential direction, it installs so that it may engage with the segment back surface adjacent to the circumferential direction. Similarly, the tunnel inner surface protecting / reinforcing segments 1 having the same length in the circumferential direction of the tunnel are sequentially connected in series in the circumferential direction of the tunnel, and the first arcuate arch portion 12 ( 12a) is constructed and supported by appropriate temporary support means.

  Then, adjacent to the arcuate arch portion 12 (12a), an end portion having a shortened arc length in the tunnel circumferential direction so as to assemble the segment 1 having a width dimension in the tunnel axis direction wider than each segment 1 Are connected adjacent to the existing side in the tunnel axial direction, and the male sheer key 3 of each segment 1 in the vicinity of the abutting sides forming the tunnel circumferential direction is connected to the back surface of the other segment 1 In an engaged state, the end of the segment 1 is received on the bottom of the receiving groove 38 of the fixing bracket 35 while the lower end of the tunnel inner surface protecting / reinforcing segment 1 for the end is placed. The pressing bolt 39 in the grooved fixing bracket 35 is pressed against the arm side 37 and fixed, and then the arc length in the tunnel circumferential direction is longer than the fixed short end segment 1, and the above-mentioned existing The circumferential ends of the tunnel inner surface of the same arc length as the side segment 1 protection and reinforcement segments 1, come into contact with the ends of the short segment first end is temporarily held by an appropriate 支保 means.

  In addition, when it has the male type shear key 52 which protrudes in a tunnel circumferential direction, it installs so that it may engage with the segment back surface adjacent to the circumferential direction. Similarly, the tunnel inner surface protecting / reinforcing segments 1 having a long length in the circumferential direction of the tunnel are similarly installed so as to be connected in series in the circumferential direction of the tunnel. (12b) is constructed and supported by appropriate temporary support means. Further, as the segment 1 at the end in the circumferential direction, at least one side of the existing side in the tunnel axial direction on the side to be newly added in the circumferential direction of the tunnel or two sides of the existing side and the new side are inclined toward the existing side in the tunnel circumferential direction, A tunnel inner surface protecting / reinforcing segment tapered so that the width of the segment body 2 is narrowed, and a segment 1 having a male sheer key 3 is installed to construct a second arc-shaped arch portion 12 (12b). .

  Hereinafter, a third arcuate arch part 12 (12c) similar to the first arcuate arch part 12 (12a) adjacent to the second arcuate arch part 12 (12b) and a fourth arcuate arch connected thereto As shown in FIG. 5, a tunnel axis direction continuous arc-shaped arch part 46 that is continuous with the part 12 (12 d) and successively in the tunnel axis direction is constructed. Each segment 1 (the same applies to the segment 1A of the present invention) is provided with a tension bolt screw 10 as shown in FIGS. 15 to 18, and the position of the segment 1 is restricted by being pressed against the inner surface of the tunnel. Alternatively, the jigs 16 and 17 or the jigs 19 and 20 between the newly installed sides can be connected to each other by bolts to facilitate temporary holding of the existing segment 1 or the segment ring 7 of the newly installed segment 1. Although not shown in the figure, before constructing the first arcuate arch portion 12 (12a), a ring that serves as a gauge for defining the shape of the ring along the tunnel inner surface, that is, a gauge ring may be assembled in advance. good. In addition, by fitting the gauge ring with the same shear key as the segment, the first arcuate arch portion 12 (12a) can be assembled with higher accuracy and a construction method with good assemblability can be adopted. it can.

  In the state where the tunnel axial direction continuous arch part 46 is constructed as described above, the arcuate arch is formed by supporting the tunnel circumferential direction new side end of the tunnel axial direction continuous arc arch part 46. The collapse of the arcuate arch portion can be prevented by attaching an anchor material fixed to the tunnel inner surface or the like at the additional side end of each arcuate arch portion 12 to the end segment. May be prevented. In place of this, although not shown, it may be supported by a temporary support.

  Next, as described above, in the state where the lower temporary material except for both ends in the circumferential direction of the tunnel-axis-direction continuous arch portion 46 continuous in the tunnel-axis direction is removed so as not to obstruct traffic, the tunnel shaft The lane switching is performed so that traffic is blocked at a part of the road surface in the circumferential direction of the tunnel to be repaired or reinforced, which is then passed through the direction continuous arch portion 46 and connected to the tunnel axial direction continuous arch portion 46.

In the state where the lane is switched as described above, as shown in FIG. 6, the tunnel of the narrow segment 1 in the tunnel axial direction in the arcuate arch portion 12 (12a) first constructed in the tunnel axial direction continuous arch portion 46 is provided. A female sheer key is provided near the existing side of FIG. 1 shown in the first embodiment so as to abut on the end portion on the newly installed side in the circumferential direction and on the inclined surface 47 of the wide segment 1 adjacent thereto in the tunnel axis direction. The female-type shear key 6 in the segment 1A having 6 (6a), the male-type shear key 3 on the existing side to be engaged therewith, and the male-type shear key 3 adjacent to the male-type shear key 3 in the circumferential direction The segment 1A having the female type shear keys 6 and 6f is moved toward the existing side in the tunnel circumferential direction, and the male type shear of each segment 1 on the existing side is placed. Guide the over 3 in the groove by the inclined guide lower face 6e of the female shear keys 6,6F, engaging the shear keys 6,6F mutual female new side shear keys 3 of the male of the existing side.
In this case, the sides 4 and 5 (5a) in contact with the existing segment 1 in the newly-established segment 1 in the circumferential direction of the tunnel have a male sheer key protruding from either side in the tunnel axial direction. 3. Since the segment 1A is provided with the female shear keys 6 and 6f that do not protrude from the sides 4, 5 (5a) in the tunnel axis direction, the shear keys 3 and 6 (6f) interfere with each other to generate the segment 1A. It will not be difficult to insert.

  Although not shown, each segment 1A is provided with a tension screw 10 for maintaining a distance from the inner surface of the tunnel or jigs 16 and 19 for temporarily fixing to the existing segment. Thus, the bolts 18 and 21 can be installed and supported on the existing side.

  The segment 1A having the female-type shear keys 6 and 6f has a side 5 on the new side facing the tunnel axial direction as shown in FIGS. 1 to 4 or FIG. 10 or 13 and 14 described later. (5b) may be a male shear key 3 protruding from the side 5 (5b) in the tunnel axis direction.

  Since the rear side (new side) in the tunnel circumferential direction of the segment 1A having the female shear keys 6 and 6f has a wider width in the tunnel axis direction, the subsequent segment 1 has a width in the tunnel axis direction. A wide segment is used, a male-type shear key 3 and a shear key 52 are provided at the rear end in the circumferential direction of the segment 1A having the female-type shear keys 6 and 6f, and the tunnel axis direction is wide. The segments 1A and 1 are connected to each other, and the male sheer keys 52 projecting in the circumferential direction from the ends of the segments 1A and 1 in the circumferential direction are engaged with each other on the back surfaces of the respective segments. The segment 1 having the male sheer key 3 and the sheer key 52 which are wide in the axial direction is arranged so as to be connected to the rear end portion in the tunnel circumferential direction. The last segment 1 is a short segment 1 in the tunnel circumferential direction that does not have a shear key 52 protruding from the rear surface of the segment toward the tunnel circumferential direction on the tunnel circumferential end side at the rear end of the tunnel circumferential direction. Then, the rear end portion is disposed in the receiving groove 38 in the fixing bracket 35 on the other end side, and an adjustment plate is appropriately interposed at the bottom portion of the receiving groove, and is pressed against the arm side 37 by the pressing bolt 39 to be fixed. (48a) is constructed, and one arch ring 7 (7a) is constructed.

  Next, the arcuate trailing arch 48 is adjacent to the arcuate trailing arch 48 in the tunnel axial direction, and has the same width as the end of the segment 1 in which the connecting end of the existing tunnel axially continuous arcuate arch 46 is narrow in the tunnel axial direction. A segment 1 having a long circumferential length and having a shear key 3 protruding from the segment body 2 in the tunnel axis direction and the tunnel circumferential direction is a male type shear key protruding from the segment body 2 in the tunnel axis direction and the tunnel circumferential direction. 52 are arranged so that the shear keys 3 are engaged with each other on the rear side of the existing segment, and the similar segments 1 are sequentially installed in the circumferential direction of the tunnel, and finally a male type shear key 52 is provided at the end of the circumferential direction of the tunnel. The end of the non-segment 1 is fixed to the fixing bracket 35, and a second arcuate trailing arch 48 (narrow in the tunnel axial direction) 8b) Constructs a further building arch ring 7 (7b) adjacent to the tunnel axis.

Hereinafter, similarly, on the new tunnel axial direction side, the segment 1A having the female shear keys 6 and 6f is incorporated in the connection portion of the tunnel axial direction continuous arc-shaped arch portion 46 which has already been installed, and connected to this in the circumferential direction of the tunnel. The shear key sequentially incorporates the segment 1 of the male sheer key 3 alone to construct the third tunnel axially wide arcuate trailing arch 48 (48c), and similarly, the third tunnel axially wide arcuate trailing arch. The arcuate trailing arch 48 (48d) and the fifth arcuate trailing arch 48 (48e) having a narrow width in the fourth tunnel axial segment adjacent to the tunnel axis 48 (48c) are constructed in the tunnel axial direction. The arch ring 7 is sequentially constructed so as to be continuous.
Thereafter, the above-described steps are repeated, and as shown by an arrow B in FIG. 6, the tunnel axial direction continuous arc-shaped subsequent arch 49 is constructed so that the arch ring 7 is continuous in the tunnel axial direction. The tunnel axial direction continuous arch 50 covering is constructed and completed. Finally, a curable filler (grout 42) may be filled and cured between the continuous arch 50 and the inner surface of the tunnel to impart shape stability of the continuous arch 50.

  In the repair and reinforcement of the inner peripheral surface of the tunnel (43) having a road (or track) such as three lanes on one side (6 lanes on all sides) or 4 lanes on one side (all 8 lanes), Directional continuous arc-shaped arch portion 46 is constructed, and connection portions including segments 1A having female-type shear keys 6 and 6f are provided corresponding to tunnel-axis-direction arc-shaped arch portions for every two lanes. By switching traffic lanes at the bottom of the arcuate arch and closing the next arcuate arch, the thin segment can be used with 3 traffic changes for all 6 lanes and 4 traffic lanes for all 8 lanes. The repair and reinforcement work on the inner surface of the tunnel was continuously performed in the tunnel axis direction, and the lane switching work and traffic obstacles were significantly reduced, and the staggered arrangement of segments was secured. No decrease in rigidity by hand can be a short construction period perform repair and reinforcement construction of economically tunnel interior surface.

(General construction procedure)
The general construction procedure of the tunnel inner surface reinforcing structure of the present invention described above is in the order of the following (1) to (3).
A. For example, when assembling from the left half ring (left arc-shaped arch) or the right half ring (not shown).
(1) Assemble the left half ring (or right half ring) one by one toward the circumferential direction of the tunnel. This is repeated in the tunnel axis direction.
(2) Next, the lanes are changed, and the right half ring (or the left half ring) is assembled one ring at a time from the top to the bottom in the tunnel circumferential direction. This is repeated in the tunnel axis direction.
(3) Finally, if necessary, the grout is filled. The grout may be (1) a bag body previously set on the back side of the segment, or (2) directly filled between the segment and the tunnel inner surface such as an existing lining.

  Next, a second embodiment of the tunnel inner surface protecting / reinforcing segment according to the present invention will be described with reference to FIGS. 8 to 10. The difference between this embodiment and the first embodiment is a female type. Since the arrangement state of the shear key 6 is different, this point will be mainly described, and the same parts are denoted by the same reference numerals.

  The arm part 6c of the female sheer key 6 provided in the vicinity of the existing arcuate side 4 and the inclined arcuate side 5a extends in parallel to the tunnel axis direction, and the existing arcuate side 4 and the inclined arcuate shape. The lower surface of the arm portion 6c is provided so as not to protrude from the side 5a, and the lower surface of the arm portion 6c is provided on the entire member width (plate thickness) of the arm portion 6c in the tunnel circumferential direction. The segment 1B has an inclined surface 6e that gradually decreases from the end edge of the arm to the end of the tunnel circumferential direction, that is, the segment 1B is tapered in the insertion direction of the segment 1B, and the lower surface of the arm portion 6c. The edge on the tunnel circumferential direction newly installed side is lower than the height of the shear key 3 of the adjacent segment in the tunnel axis direction that engages with the lower surface of the arm portion 6c. So as to prevent the escape of the existing side.

  The upper end shape in the tunnel circumferential direction of the shear key 3 of the existing side segment 1 that engages with the lower surface of the arm portion 6c may be a shape that is perpendicular to the tunnel radial direction, as shown on the left in FIG. As shown on the left of FIG. 10B, the shape of the upper end portion of the shear key 3 is such that the edge on the existing side in the tunnel circumferential direction is inclined so that the edge on the new side in the tunnel circumferential direction gradually becomes higher than the edge on the new side in the tunnel circumferential direction In either case, when the female sheer keys 6 and 6f are arranged on the existing side in the tunnel circumferential direction, they are guided by the inclined lower surface 6e of the arm portion 6c, or the arm portion 6c The inclined lower surface 6e and the inclined upper surface 3f of the male shear key 3 on the existing side function as a guide portion, facilitating the installation work of the new segment 1B. The tunnel radial position of the body 2 of the instrument 1B makes it possible to put in place, also allowing the transmission of shearing force of the tunnel radial.

  If the lower surface of the arm portion 6c of the female type shear key 6 and 6f and the upper surface of the male type shear key 3 are inclined surfaces having the same inclination angle, the inclined surfaces of the male and female shear keys 3 and 6 (6f) are brought into surface contact with each other. Thus, it can function as a member that transmits the shearing force in the tunnel radial direction or the axial force in the circumferential direction of the tunnel with less stress concentration.

  FIG. 11 shows a state immediately before the segment 1B having the female shear keys 6 and 6f as described above is incorporated into the leading connecting end of the continuous arc-shaped trailing arch portion 46 in the tunnel axis direction, and FIG. 12 shows the assembled state. Has been. These drawings are state diagrams in which female shear keys 6 and 6f are incorporated in order to construct the arcuate trailing arch part 48 at the tunnel axis direction continuous arcuate end 46 of the tunnel axis direction continuous arcuate arch part 46. The construction procedure is the same as in the above embodiment.

  In the form in which the lower surface of the arm portion 6c of the female type shear key 6 and 6f and the upper surface of the male type shear key 3 are engaged so as to overlap, the female / male shear key 6 on the back surface of the segment is in the overlapped state. The arrangement of (3) is simplified, and the filling property when filling grout is improved.

  As another form, as shown in FIG. 14, at the connection end of the arcuate arch portion 12 on the existing side in the tunnel circumferential direction, every other end in the tunnel axial direction, at the end on the new side in the tunnel circumferential direction. A tunnel axial direction continuous arch 46 having an inclined side 51 serving as a tapered guide portion that is inclined so that both sides of the tunnel circumferential direction approach each other, and incorporating a segment 1 having a male sheer key 3. In such a case, as shown in FIG. 13, it has an inclined side 5a that inclines so that both sides of the tunnel circumferential direction approach toward the end on the existing side in the tunnel circumferential direction, and a female type shear key in the vicinity thereof. You may make it install the segment 1C which has 6 (6a, 6f). The construction procedure and the like are the same as in the above embodiment. In the case of the form shown in FIG. 13, since both sides (inclined arc-shaped sides 4a and 5a) forming the tunnel circumferential direction on the existing side in the tunnel circumferential direction are tapered toward the existing side, the new segment is used as the existing segment. In addition to being able to install without being made, and can be installed while being guided in the tunnel axis direction by both sides 5a inclined in the tunnel axis direction, the insertion installation work on the existing side is more than in the case of the above embodiment. Easy.

  Although the illustrated embodiment has been described in the form of an automobile tunnel, when the present invention is implemented, it may be applied to a railway tunnel or other tunnels to repair or reinforce the tunnel inner surface.

  In addition, regarding the filling of the grout on the back of the segment, it will be performed when the semicircular continuous arch continuous in the tunnel axial direction is completed rather than filling in the construction stage of the arc arch or tunnel axial continuous arch. Filling is preferred.

  In addition, when the shear key 52 protruding in the tunnel circumferential direction is provided as in the above-described embodiment, the shear force can be transmitted to the adjacent segment in the tunnel circumferential direction, and the case where the shear key 52 is not provided is provided. A ring having excellent rigidity and strength in the tunnel circumferential direction can be obtained.

Next, referring to FIG. 15, a segment 1 (FIG. 15 b) in which the shear key protruding in the tunnel axial direction used in the arcuate arch middle part (or end part) used in the present invention is a male shear key 3. The shape of the segment 1 (see FIG. 15a) having only the male sheer key 3 used in the arc-shaped arch connecting portion will be described. In the vicinity of each side of the arcuate side 4 on the existing side and the arcuate side 5 on the new side of the tunnel body in the circumferential direction of the segment main body 2 for protecting and reinforcing the inner surface of the faceplate-shaped tunnel, Similar to the above, a shear key 3 is provided to project in the tunnel axis direction.
In the segment 1 of FIG. 15A, the inclined arc-shaped side 4a is provided from the new-side end portion in the tunnel circumferential direction of the existing-side arc-shaped side 4 toward the center, and the new-side end portion of the segment 1 is tapered. Thus, the inclined arc-shaped side 5a of the segment 1A having the female type shear key 6 (6a) can be guided.
Also, it is perpendicular to the sides (the existing side 24 at the tunnel circumferential end and the new side 25 at the tunnel circumferential end) at both ends in the circumferential direction of the segment body 2 for protecting and reinforcing the inner surface of the tunnel. A plurality of shear keys 52 are provided at intervals in the tunnel axis direction so as to protrude in the circumferential direction.
Note that the jigs 16 and 17 for configuring the inter-ring fixing jig are the same as those in the conventional case, and the jigs 19 and 20 for forming the inter-segment fixing jig in the circumferential direction are also the conventional ones. It is the same as the case of.

  Here, the operation of the male shear key 3 projecting in the tunnel axis direction in each of the segments 1 and 1A will be described. A plurality of tunnel inner surface protecting / reinforcing segments 1 are arranged along the existing tunnel inner surface. When the tunnel inner wall concrete collapses between the tunnel inner surface protecting and reinforcing segment rings 7 (7a, 7b) that are installed in series in the direction and constitute the arch, (1) At least transmit the shearing force in the tunnel radial direction And (2) is provided for transmitting a bending moment, transmitting the bending moment to a plurality of tunnel inner surface protecting / reinforcing segment rings 7 (7a, 7b) in the tunnel axis direction, and transmitting and dispersing the whole.

  Further, when the shear key 52 protruding in the circumferential direction of the tunnel is provided, the shearing force can be transmitted between the segments 1 adjacent in the circumferential direction in the segment ring 7 for protecting and reinforcing the inner surface of the tunnel as described above. Thus, the tunnel inner surface protecting / reinforcing structure having higher rigidity and strength than the case where the shear key 3 is not provided can be obtained.

  Further, the female shear key 6 provided so as not to protrude from the rear surface of the segment body is engaged with the male shear key 3 to transmit shearing force in the tunnel radial direction in the same manner as the male shear key 3. Can do.

  In the embodiment, since the male sheer key 3 protrudes so as to project in the tunnel axis direction, the position in the circumferential direction of the existing shear key 3 (3a) in the tunnel axis direction and the newly installed The position of the shear key 3 (3b) in the circumferential direction on the side (rear side) is shifted in the tunnel circumferential direction (the arcuate circumferential surface direction of the segment body 2 for protecting and reinforcing the tunnel inner surface).

  The reason for shifting the circumferential position in this way is to transmit the shearing force in the tunnel radial direction by arranging in a staggered arrangement in the tunnel axis direction, and as a result to transmit the bending moment in the tunnel circumferential direction to the adjacent ring, It is necessary to be able to transmit the shearing force in both the positive and negative directions in the tunnel radial direction, and at the same time, in order to secure a wide cross section in the tunnel, it is necessary to eliminate the overlap of shear keys in order to provide a protective and reinforcing structure for the thin tunnel inner surface. It is devised to satisfy all the points of thinning the wall and forming a ring that is smooth on the inner surface and excellent in anticorrosion and aesthetics without providing a protrusion on the inner side of the tunnel.

  The shear keys 3 arranged on the sides 4 and 5 of the segment 1 in the circumferential direction of the tunnel are shifted in position in the circumferential direction of the tunnel, and the arch of the segment ring 7 for protecting and reinforcing the tunnel inner surface is provided. In the intermediate portion, the same tunnel inner surface protecting / reinforcing segment 1 can be used, and the existing inner side segment ring 7a of the tunnel inner surface protecting / reinforcing segment ring 7 adjacent to the tunnel axial direction, Between the segment rings 7b, the tunnel inner surface protecting / reinforcing segments 1 are engaged with the back surfaces of the segment main bodies 2 by the shear keys 3, respectively.

  As a material constituting the thin-walled plate-shaped tunnel inner surface protecting / reinforcing segment 1, 1A, in order not to exceed the building limit on the sky side in the tunnel, for example, a thick steel plate having a thickness of 30 mm or less, FRP plate material, cast steel face plate material, or the like may be used. The shear keys 3, 6 and 52 may be integrally formed with the segment body, or may be fixed by fixing means such as welding or bolts.

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

  When carrying out the present invention, the planar shape of the segment in the connecting portion is a rectangular shape, a pentagonal segment having an inclined side 5a as shown in FIG. 1 or FIG. 8, and a tapered segment as shown in FIG. Or although illustration is abbreviate | omitted, the form from which an inclination angle differs by a taper-shaped segment is also possible, and also the refraction | bending in which several inclination angles differ, or a curved inclined side is also possible.

The tunnel inner surface protection / reinforcing segment of the first embodiment of the present invention having a female type shear key is shown, wherein (a) is a plan view and (b) is a front view. (A) is the sectional view on the aa line of Fig.1 (a), (b) is a figure which expands and shows a part of (a). After the semi-arch ring is continuously constructed in the tunnel axial direction, the tunnel inner surface protecting / reinforcing segment of the first embodiment having the female sheer key is attached to the head of the wide segment in the remaining semi-arch ring. It is an expansion | deployment top view which shows the state assembled toward the existing side as a segment. FIG. 4 is a developed plan view showing a state in which the tunnel inner surface protecting / reinforcing segment of the first embodiment including a new female-type shear key is set on the existing side segment from the state of FIG. 3 on the existing side. Explain the order of segment assembly when a quarter arch is to be constructed over the entire length in the tunnel axis direction when the half arch ring is constructed in half in the tunnel circumferential direction. It is explanatory drawing for. FIG. 6 is an explanatory diagram for explaining a segment assembling construction procedure in the case where the remaining ¼ arch-shaped portion is constructed over the entire length in the tunnel axis direction after the lane change from the state of FIG. 5. It is explanatory drawing at the time of assembling the segment for tunnel inner surface protection and reinforcement of 1st Embodiment provided with the female type shear key to the existing side. FIG. 2 shows a tunnel inner surface protecting / reinforcing segment according to a second embodiment of the present invention having a female-type shear key extending in the tunnel axis direction in the rear surface of the segment, wherein (a) is a plan view, (b) ) Is a front view. 8A is a sectional view taken along the line bb in FIG. 8A, FIG. 8B is a sectional view taken along the line cc in FIG. 8A, and FIG. It is. (A) Engage the female type shear key in the second embodiment of the present invention having the female type shear key shown in FIG. 8 with the male type shear key in the existing segment that engages with the female type shear key. Therefore, it is explanatory drawing which shows the state which is moving so that it may approach. (B) is a form in which the female-type shear key in the second embodiment of the present invention having the female-type shear key shown in FIG. 8 is provided with an inclined surface on the upper surface of the existing segment that engages with the female-type shear key. It is explanatory drawing which shows the state which is moving so that it may approach, so that it may engage with the male type shear key. After the semi-arch ring is continuously constructed in the tunnel axis direction, the tunnel inner surface protecting / reinforcing segment of the second embodiment having the female sheer key is placed at the head of the wide-width segment in the remaining semi-arch ring. It is an expansion | deployment top view which shows the state assembled toward the existing side as a segment. FIG. 12 is a developed plan view showing a state in which a tunnel inner surface protecting / reinforcing segment according to a second embodiment having a female shear key newly installed on the existing side segment from the state of FIG. 11 is set on the existing side. FIGS. 2A and 2B show a tunnel inner surface protecting / reinforcing segment having a planar shape in which the end portion on the insertion side is tapered, wherein FIG. 3A is a plan view and FIG. 2B is a front view. It is explanatory drawing at the time of using the segment for tunnel inner surface protection and reinforcement of the planar form which made the end part shape of the insertion side of the form shown in FIG. A segment used in the present invention and used in an arcuate arch middle part or an arcuate arch end part, wherein (a) is an end of one side of the side forming the tunnel circumferential direction as an inclined arcuate side, The top view which shows one form of the segment which has only a male type shear key, (b) is a top view which shows the form of the segment where the sides which make a tunnel circumferential direction are parallel, (c) is the front of (a) and (b) FIG. The tunnel lining inner surface repair and reinforcement segment concerning a prior art example is shown, (a) is a top view, (b) is a front view. (A), (b), and (c) are the dd line sectional view, ee line sectional view, and ff line sectional view of Drawing 16 (a), respectively. (A) is an enlarged view of FIG. 17 (a), (b) is a longitudinal side view of the vicinity of the female fixing jig, and (c) is an enlarged front view of FIG. 17 (c). FIG. It is explanatory drawing which shows the usage aspect of the segment of the conventional repair and reinforcement, and the structure of a segment ring. It is explanatory drawing which shows the state which has arrange | positioned so that the existing segment ring or segment may be supported using the segment of the conventional repair and reinforcement. It is explanatory drawing which shows the state which supported the newly established segment on the existing segment ring or segment using the conventional repair and reinforcement segment. (A) is a schematic longitudinal front view which shows the state which has constructed the segment ring structure by the segment of repair and reinforcement, (b) is a front view which shows the fixed structure structure of the lower part of a lower end part segment. It is a vertical front view which shows the form which fills the back surface of the segment ring of repair and reinforcement with grout. The other form of the conventional segment which has the male type shear key which protrudes in a tunnel circumferential direction at the edge part in a tunnel circumferential direction is shown, (a) is a top view, (b) is a front view. FIG. 17 shows an example of an end segment whose length in the circumferential direction of the tunnel is shortened, in a form cut by gg or hh in FIG. 16, (a) is a plan view of the end segment on one end side. (B) is the front view, (c) is a top view of the end segment of the other end side, (d) is the front view.

Explanation of symbols

1 Tunnel lining inner surface protection / reinforcement segment 1A Tunnel lining inner surface protection / reinforcement segment 1B Tunnel lining inner surface protection / reinforcement segment 1C Tunnel lining inner surface protection / reinforcement segment 2 Tunnel lining inner surface protection -Reinforcing segment body 3 Shear key 3a Existing side shear key (shear key protruding in the tunnel axis direction)
3b New Shear Key (Shear key protruding in the tunnel axis direction)
3c Male shear key (Shear key protruding in the tunnel axis direction)
3d One side 3e Other side 3f Inclined surface 4 Existing arc-shaped side 4a Inclined arc-shaped side 5 New-sided arc-shaped side 5a Inclined arc-shaped side 6 (6a) Female sheer key 6b Leg 6c Arm 6d Opening groove 6e Inclined surface 6 ( 6f) Female sheer key 7 Segment ring 7a Existing side segment ring 7b New side segment ring 8 Strut member 9 Female thread hole 10 Strut screw 11 Through hole 12 Tunnel axial arc-shaped arch part 13 Turning tool engaging recess 14 Between rings Fixing jig 15 Inter-segment fixing jig 16 Jig 17 Jig 18 Bolt 19 Jig 20 Jig 21 Bolt 24 Tunnel circumferential direction existing side 25 Tunnel circumferential new side 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 Road surface 45 Road surface 46 Tunnel axial direction continuous arc-shaped arch portion 47 Inclined surface 48 Arc-shaped subsequent arch 49 Tunnel-axis-direction continuous arc-shaped trailing arch 50 Tunnel-axis-direction continuous arch 51 Inclined side 52 Shear key protruding in the tunnel circumferential direction

Claims (8)

  Install the thin segments divided in the tunnel circumferential direction and tunnel axial direction in a staggered pattern in the tunnel circumferential direction for each segment ring adjacent in the tunnel axial direction along the tunnel lining inner surface. In the tunnel inner surface protection / reinforcement segment used to create a tunnel inner surface protection / reinforcement structure that protects and reinforces the tunnel, in the tunnel axis direction, at multiple points on each side of the tunnel circumferential direction in the plate-shaped segment body As a joint material for connecting adjacent segment rings, a shear key is assembled as a pair with a first segment provided on the back surface of the segment so as to protrude in the tunnel axis direction at intervals in the circumferential direction. 2 segments, the ring provided so as to project in the tunnel axis direction of the first segment In the back surface of the second segment so that the shear key in the second segment that becomes the joint between the segment rings that engages with the shear key that becomes a hand does not protrude in the tunnel axis direction on the back surface of the first segment that faces it. A segment for protecting and reinforcing the inner surface of a tunnel, which is provided so as to fit.   A female type for fitting a male sheer key serving as a ring joint provided so as to project in the tunnel axis direction on the back surfaces of two segments adjacent to each other in the tunnel axis direction on the back surface of the second segment. A plurality of shear keys are provided, and each of the female shear keys extends in the tunnel circumferential direction or the axial direction with the base end fixed to the back of the segment and the distal end of the leg away from the back of the segment. The tunnel inner surface protecting / reinforcing segment according to claim 1, further comprising: an arm portion provided so as to perform.   The female shear key in the second segment is parallel to the male shear key composed of a rod-like member or plate-like member that becomes a ring joint provided on the back surface of the first segment so as to project in the tunnel axis direction. The inner surface of the tunnel according to claim 1 or 2, characterized in that it is a reverse L-shaped female sheer key that becomes a ring joint provided so as not to protrude in the tunnel axial direction on the back surface of the segment. Reinforcing segment.   The female-type shear key in the second segment has an arm portion that engages at right angles with a rod-shaped or plate-shaped male type shear key that forms a ring joint provided so as to project in the tunnel axis direction on the back surface of the first segment. 3. The tunnel inner surface according to claim 1, wherein the tunnel inner surface is an inverted L-shaped female sheer key that is a ring joint provided so as not to protrude in the tunnel axis direction on the rear surface of the segment. Segment for protection and reinforcement.   5. An inclined surface that gradually approaches the rear surface of the segment toward the back side is provided on the lower surface of the arm portion of the inverted L-shaped female sheer key to be a ring joint. Segments for protecting and reinforcing the inner surface of the tunnel.   The taper-shaped guide part is provided toward the center from the front-end | tip part of any one or both sides along the tunnel circumferential direction in a said 2nd segment, The any one of Claims 1-5 characterized by the above-mentioned. For protecting and reinforcing the inner surface of tunnels.   Protect the tunnel inner surface by installing thin segments divided in the tunnel circumferential direction and tunnel axis direction along the tunnel inner surface so that each segment ring adjacent in the tunnel axis direction forms a staggered group in the tunnel circumferential direction. In the tunnel inner surface protection / reinforcement structure to be reinforced, the tunnel inner surface protection / reinforcement segment according to any one of claims 1 to 6 includes a plurality of arc-shaped arch portions constituting the tunnel inner surface protection / reinforcement arch ring. Used as one end segment in a connecting portion between arc-shaped arch portions that are used in the connecting portion and are adjacent to each other in the circumferential direction, and the arc-shaped arch portion has a plurality of segments assembled in the tunnel circumferential direction. Tunnel inner surface protection and reinforcement structure.   Install thin segments divided in the tunnel circumferential direction and tunnel axial direction along the tunnel inner surface so that each segment ring adjacent in the tunnel axial direction forms a staggered group in the tunnel circumferential direction. In the tunnel inner surface protection / reinforcement method for protecting / reinforcing, an arc-shaped arch formed by assembling a plurality of segments that are part of the arch ring in the tunnel circumferential direction is continuously assembled in the tunnel axis direction, The tunnel axial direction continuous arc arch part is constructed and the tunnel axial direction continuous arc arch part is constructed in advance, and the tunnel axial direction continuous arc arch part is constructed and connected to the tunnel circumferential direction in the tunnel circumferential direction later. A connecting portion with an arcuate subsequent arch portion, wherein the arcuate arch portions are alternately connected to each other in the tunnel axial direction. Method for constructing a tunnel inner surface protecting and reinforcing structure, characterized in that the construction of the tunnel axis continuous arch using a segment of the tunnel inner surface for protection and reinforcement according to any one of Motomeko 7.

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