JP7409849B2 - Reinforcement structure of existing tunnel - Google Patents

Description

The present invention relates to a reinforcement structure for an existing tunnel and a method for reinforcing an existing tunnel, and particularly to a reinforcement structure for an existing tunnel and an existing tunnel reinforcement structure for reinforcing an existing tunnel lining provided in a tunnel having a curved cross-sectional shape. Reinforcement method.

As an existing tunnel with a curved cross-sectional shape, for example, a shield tunnel with a circular cross-sectional shape, as it ages, the primary lining of segments covering the inner wall of the tunnel, etc., or the formation inside the primary lining. The secondary lining made of concrete, etc., may be damaged by cracks, corrosion, etc. due to consolidation subsidence of the surrounding ground, or salt damage in areas near the sea.

As a repair method when the lining of an existing tunnel that has a curved cross-section, such as a shield tunnel, is damaged due to cracks or corrosion, a curved section is installed inside the lining of the existing tunnel. It is conceivable to form a new reinforcing lining using shoring material, concrete, etc. along the inner circumferential surface of a tunnel having a cross-sectional shape (see, for example, Patent Document 1).

Japanese Patent Application Publication No. 2001-271599

However, when forming a new reinforcing lining using shoring materials, concrete, etc. inside the existing tunnel lining along the inner peripheral surface of the tunnel that has a curved cross-sectional shape, For example, if the existing tunnel lining is for a railway tunnel such as a subway, the construction time to form the reinforcing lining is limited to a few hours late at night when trains are not running. Because of this, it is necessary to repeat the work over several hours, and because railway tunnels have limits for vehicles as space sections that vehicles must not enter while they are running, supporting materials during construction are also required. It is necessary to be able to form the reinforcing lining so as not to violate the vehicle limits.

In particular, in the case of an aging shield tunnel, for example, there is a concern that the existing tunnel lining may be deformed or displaced due to consolidation subsidence of the surrounding ground, etc. There is a need for the development of technology that can absorb deformation and form reinforcing linings with higher precision.

The present invention provides a reinforcing lining for reinforcing an existing tunnel lining formed along the inner peripheral surface of a tunnel having a curved cross-sectional shape, using a steel supporting member and a hardenable material. It is an object of the present invention to provide a reinforcement structure and method for reinforcing an existing tunnel, which can be efficiently reinforced by repeating the work preferably over several hours, and which can be formed with higher precision.

The present invention is an existing tunnel reinforcement structure for reinforcing an existing tunnel lining provided in a tunnel having a curved cross-sectional shape, the present invention is a reinforcement structure for an existing tunnel lining provided in a tunnel having a curved cross-sectional shape. A plurality of panels with panel mounting surfaces on the inside are installed extending in the circumferential direction at predetermined intervals in the tunnel extension direction by using mounting seats arranged and fixed at multiple locations on the inner circumference. The steel supporting member is supported by the steel supporting member and is attached in a circumferential direction so as to straddle the panel mounting surface of each pair of steel supporting members adjacent in the extending direction of the tunnel. a plurality of covering panel members, and a space between the covering panel member and the existing tunnel lining is filled, and the steel supporting member, the covering panel member, and the existing tunnel lining are integrated. The inner surface of one flange portion of the steel support member, which serves as the panel mounting surface, is provided with a predetermined interval in the circumferential direction at the center portion in the width direction. A nut member for fastening the pressing fixing member to the steel supporting member is fixed, and the covering panel member is fixed in a state where the covering panel member is pressed against the panel mounting surface of the steel supporting member. The pressing fixing members are connected in a circumferential direction and supported by the steel supporting members, and the pressing fixing members are used to attach the steel supporting members to the panel. By screwing and tightening a fixing bolt member provided with a rib washer or a fastening nut onto the nut member fixed to the surface, both sides of the pressing fixing member are sandwiched between the rib washer or the fixing nut. The plurality of consecutive covering panel members are fixed in a state pressed against the steel supporting member by fastening the ends of the covering panel members to the steel supporting member, and the steel supporting member is fixed to the steel supporting member. It is formed by a plurality of unit steel supporting members that are integrated by connecting end faces to each other in the circumferential direction of an existing tunnel lining, and a pair of adjacent units at at least one joint location. A telescopic jack is attached to the steel supporting member at both ends thereof, and the length in the circumferential direction of the steel supporting member can be adjusted, and the distance between the pair of end faces expanded by the telescopic jack is The above object is achieved by providing a reinforcing structure for an existing tunnel in which one or more length adjustment plates are sandwiched between the sections .

Further, in the reinforcement structure for an existing tunnel of the present invention, the mounting seat includes a plurality of male threaded bolt members fixed to protrude inward from the existing tunnel lining, and a nut member screwed onto the male threaded bolt members. and a pedestal plate member having a plurality of fastening holes that is tightened and fixed to the male threaded bolt member in a state in which the height is adjusted by the pedestal plate member of the mounting seat. It is preferable that the panel be attached along the inner peripheral shape of the existing tunnel lining with the installation position of the panel attachment surface adjusted.

Further, in the reinforcing structure for an existing tunnel of the present invention, the steel supporting member is made of I-beam steel or H-beam steel, one flange part is arranged inside as the panel mounting surface, and the other flange part is arranged inside as the panel mounting surface. is disposed in contact with the pedestal plate member of the mounting seat as a joint surface portion, and the mounting seat includes a sandwiching plate piece having a fastening hole and a bolt/nut member; By tightening the bolt and nut members into the fastening holes of the pedestal plate member and the sandwiching plate piece while the flange portion of the plate is sandwiched between the pedestal plate member and the sandwiching plate piece, the steel Preferably, a support member is joined to the base plate member of the mounting seat.

Further, in the reinforcing structure for an existing tunnel of the present invention, the sandwich plate piece is integrally attached to a flat plate-shaped sandwich main body and an edge portion of the surface of the sandwich main body on the pedestal plate member side. It is preferable that the spacer rib has a height similar to the thickness of the other flange portion.

Furthermore, in the existing tunnel reinforcing structure of the present invention, the existing tunnel lining is formed of reinforced concrete segments or synthetic segments, and the male threaded bolt members have their bases buried in the concrete parts of these segments. Preferably, it is secured by an anchor bolt.

Further, in the reinforcing structure for an existing tunnel of the present invention, it is preferable that a lower anchor member protruding from the lower part of the existing tunnel lining into the space and embedded in the curable material is attached.

Further, in the reinforcement structure for an existing tunnel of the present invention, the existing tunnel lining is formed of reinforced concrete segments or synthetic segments, and the lower anchor member has a base buried in the concrete portion of these segments. Preferably, it is secured by an anchor bolt.

The present invention also provides a method for reinforcing an existing tunnel lining provided in a tunnel having a curved cross-sectional shape, the method comprising: By using mounting seats that are arranged and fixed at multiple locations on the inner circumference of the existing tunnel lining having a curved cross-sectional shape, the members can be mounted at predetermined intervals in the tunnel extension direction in the circumferential direction. a step of installing a support member by extending the support member into the support member; a panel member installation step in which the panel members are installed in a continuous manner in the circumferential direction while being supported by the steel supporting members, the covering panel members and the existing tunnel The above object has been achieved by providing a method for reinforcing an existing tunnel, which includes a backfilling step of filling a curable material to integrate the tunnel lining with the tunnel lining.

According to the reinforcing structure or method for reinforcing an existing tunnel of the present invention, a reinforcing lining for reinforcing an existing tunnel lining formed along the inner peripheral surface of a tunnel having a curved cross-sectional shape is made of steel. By using a made support member and a curable material, reinforcement can be performed efficiently, preferably by repeating the work over several hours, and it can be formed with higher precision.

1 is a schematic cross-sectional view of a shield tunnel, illustrating an existing tunnel lining reinforced by an existing tunnel reinforcement structure according to a preferred embodiment of the present invention. 2 is an enlarged view of part A in FIG. 1. FIG. (a) is an enlarged view of part B in FIG. 2, (b) is a sectional view taken along line CC in (a), and (c) is a front view of (a) seen from the left side. (a) is a plan view, and (b) is a side view, explaining a sandwiching plate piece. FIG. 2 is a schematic side view of a steel support member, illustrating a telescopic jack that can adjust the length of the steel support member in the circumferential direction. 2A is a cross-sectional view of the steel support member, and FIG. 1B is a partial internal view of the steel support member, illustrating a nut member fixed to the panel mounting surface of the steel support member. FIG. (a) is a front view of the covering panel member, (b) is a rear view, (c) is a sectional view taken along DD in (b), and (d) is an enlarged view of section E in (c). FIG. 7 is a developed layout diagram of the covering panel members, illustrating a state in which a plurality of covering panel members are attached in succession in the circumferential direction along the inner wall surface of an existing tunnel lining body. A situation in which multiple covered panel members are installed so as to straddle the panel mounting surfaces of a pair of steel supporting members is explained. (a) is a partially schematic internal view, (b) is a diagram showing FF in (a). (c) is a partially schematic cross-sectional view taken along line GG in (a); FIG. 3 is a partial vertical cross-sectional view taken along line HH in FIG. 2 and showing a state in which a pressing fixing member is attached, illustrating a reinforcing structure for an existing tunnel according to a preferred embodiment of the present invention.

In the reinforcing structure 10 for an existing tunnel according to a preferred embodiment of the present invention, as shown in FIG. 1, an inner wall surface 51 of a tunnel 50 having a curved cross-sectional shape is, for example, an inner wall surface of a shield tunnel having a circular cross-sectional shape. 51, an existing tunnel lining 55, preferably made of reinforced concrete segments or synthetic segments, is used as a hardenable material 14 (see FIG. 10), preferably a cement-based hardenable material such as non-shrinkage mortar, This structure was adopted for efficient reinforcement. That is, in the present embodiment, the shield tunnel 50 is used as a railway tunnel for a subway, for example, and a considerable period of time has passed since the start of the service, so that due to aging, damaged parts due to cracks, corrosion, etc. Therefore, by adopting the reinforcement structure 10 for the existing tunnel, the existing tunnel lining 55 where the damaged part has been reinforced is reinforced with the reinforcing lining 58 (see FIG. 10). It has become. Further, the existing tunnel reinforcement structure 10 of this embodiment can be constructed in a few hours even if the shield tunnel 50 is a railway tunnel and the construction time is limited to a few hours late at night when trains are not running. The reinforcing lining body 58 can be formed efficiently by repeating the above operations, and the reinforcing lining body 58 can be formed more accurately to prevent the reinforcing lining body 58 from digging into the limits of the vehicle. ing.

The reinforcing structure 10 for an existing tunnel of the present embodiment includes an existing tunnel lining body 55 provided in a shield tunnel 50 that constitutes a railway tunnel with a circular cross-sectional shape, as a tunnel 50 having a curved cross-sectional shape. As shown in FIGS. 1 and 2, this is a reinforcing structure for reinforcing mounting seats 12 arranged and fixed at multiple locations on the inner circumference of an existing tunnel lining 55 having a curved cross-sectional shape. A plurality of steel supporting members 11 having panel mounting surfaces 11a on the inner side are installed extending in the circumferential direction at predetermined intervals in the extension direction X of the tunnel 50 (see FIG. 10). , so as to straddle the panel mounting surfaces 11a of each pair of steel supporting members 11 adjacent in the extending direction X of the tunnel 50 (see FIGS. 9(a) to (c)), and being supported by the steel supporting members 11. A plurality of covering panel members 13 are attached in succession in the circumferential direction, and a space 56 between the covering panel member 13 and the existing tunnel lining body 55 is filled, and the steel supporting member 11 and the covering panel member 13 are filled in. and a curable material 14 (see FIG. 10) that integrates the existing tunnel lining body 55.

In addition, in this embodiment, as shown in FIGS. 3(a) to 3(c), the mounting seats 12 include a plurality of mounting seats 12 (in this embodiment, four A plurality of fastening holes (outer fastening holes) are tightened and fixed to the male threaded bolt member 12a with the height adjusted by the male threaded bolt member 12a of the main thread) and the nut member 12b screwed onto the male threaded bolt member 12a. 12c and a base plate member 12d. The steel supporting member 11 is joined to the pedestal plate member 12d of the mounting seat 12, so that the installation position of the panel mounting surface 11a is adjusted, and the steel supporting member 11 is attached to the inner peripheral shape of the existing tunnel lining 55. installed.

Furthermore, in this embodiment, the steel support member 11 is made of I-beam steel or H-beam steel (I-beam steel in this embodiment), and one flange portion is arranged inside as the panel mounting surface 11a. , the other flange portion is arranged as a joint surface portion 11b in contact with the pedestal plate member 12d of the mounting seat 12. The mounting seat 12 includes a sandwiching plate piece 15 having a fastening hole 15b (see FIG. 4(a)) and a bolt/nut member 16, and the other flange portion 11b of the steel supporting member 11 is connected to the base plate member. By tightening the bolt and nut members 16 into the fastening holes 12e and 15b of the pedestal plate member 12d and the sandwiching plate piece 15 while being sandwiched between the steel support member 12d and the sandwiching plate piece 15, the steel support member 11 It is joined to the pedestal plate member 12d of the mounting seat 12.

As shown in FIGS. 4(a) and 4(b), the sandwich plate piece 15 is formed integrally with a flat plate-shaped sandwich main body 15a and along the edge of the surface of the sandwich main body 15a on the pedestal plate member 12d side. It has a spacer rib 15c having a height similar to the thickness of the other flange portion 11b of the attached steel support member 11. Since the sandwiching plate piece 15 has the spacer rib 15c having the same height as the thickness of the other flange portion 11b, the other flange portion 11b of the steel support member 11 can be connected to the base plate member 12d and the sandwiching plate piece. When joining the steel supporting member 11 to the pedestal plate member 12d by tightening the bolt/nut member 16 into the fastening holes 12e and 15b while sandwiching it between the flat plate-shaped sandwiching main body 15a By tilting diagonally, it becomes possible to effectively avoid failure to join in a stable state.

In this embodiment, the existing tunnel lining 55 that covers the inner wall surface 51 of the shield tunnel 50 is preferably a lining made of reinforced concrete segments or synthetic segments. Since the tunnel lining body 55 made of reinforced concrete segments or synthetic segments has an exposed concrete part on the inner surface, anchor holes are drilled at a predetermined depth in the exposed concrete part. Preferably, the base of the male threaded bolt member 12a of the mounting seat 12 or the base of the lower anchor member 19 described later is embedded and fixed as a cement-based anchor or a resin-based anchor in the drilled anchor hole. The male screw bolt member 12a and the lower anchor member can be easily fixed in a predetermined position with high precision in a state in which they protrude from the inner surface of the existing tunnel lining body 55.

Further, in this embodiment, the steel supporting member 11 is preferably made of galvanized I-beam steel or H-beam steel (in this embodiment, H150×75 I-beam steel), and the flange portion of one of the steel supporting members 11 is A panel mounting surface 11a is formed. As shown in FIG. 5, the steel support member 11 made of I-shaped steel is preferably pre-installed in a factory or the like from the side wall of the tunnel 50 above the inverted concrete section 57 (see FIG. 1) at the bottom to the top. The shape along the inner wall surface 51 of the existing tunnel lining body 55 up to this point is suitably divided into a plurality of unit supporting members 11', which are transported to the site. The steel supporting members 11 are a plurality of unit steel supporting members 11 that are integrated by connecting end faces to each other in the circumferential direction of the existing tunnel lining body 55 by a known method using bolt members or the like. By being formed by ', it can be easily installed along the inner wall surface 51 from the side wall part to the upper part of the tunnel 50. A plurality of rings of steel supporting members 11 made of I-shaped steel are installed in the extending direction X of the tunnel 50 at a predetermined center-to-center pitch of, for example, about 900 mm.

A telescopic jack 17 that can adjust the circumferential length of the steel support member 11 is attached to at least one joint of the steel support member 11 made up of a plurality of unit support members 11'. preferable. The telescopic jack 17 is attached with both ends connected to a pair of adjacent unit steel support members 11' at the joint location. One or more length adjustment plates 18 can be inserted into the space between the end faces of the pair of unit steel support members 11' that have been expanded by the telescopic jack 17. As a result, for example, if the existing tunnel lining 55 of the aged shield tunnel 50 is deformed or displaced due to distortion etc. due to the influence of consolidation subsidence of the surrounding ground, etc., or if the curved section of the tunnel 50 etc. When the circumferential length of the existing tunnel lining body 55 changes, the steel supporting member 11 is made longer in the circumferential direction so as to absorb deformation or displacement due to strain, etc., or to cope with the change in the circumferential length. It becomes possible to adjust the size as appropriate to match the actual size.

Further, on the inner surface of one flange portion of the steel supporting member 11 that serves as the panel mounting surface 11a, a distance ( As shown in FIG. 9(a)), FIG. 5, and FIGS. 6(a) and (b), a nut member 21 for fastening a pressing fixing member 20, which will be described later, to a steel support member 11 is preferably It is fixed to the center part in the width direction by welding or the like.

In the present embodiment, the steel supporting members 11 made of I-shaped steel are arranged and fixed at a plurality of locations on the inner circumference of the existing tunnel lining 55 having a curved cross-sectional shape, as described above. Extending in the circumferential direction at predetermined intervals in the extending direction This means that it can be installed accurately and stably.

The male screw bolt member 12a constituting the mounting seat 12 is an anchor bolt member having a length of about 200 mm and a thickness of about M16, for example. The male screw bolt member 12a has its base portion buried and fixed in the anchor hole drilled in the existing tunnel lining body 55 in the portion where each mounting seat 12 is installed, so that the male screw on the tip side is fixed. With the portions protruding by about 50 to 60 mm, they are placed at the corners of an imaginary rectangle or square having a side of, for example, about 190 to 200 mm, and are attached at four locations. A pair of nut members 12b are screwed onto the male threaded portions of the male threaded bolt members 12a that protrude from the existing tunnel lining body 55.

The pedestal plate member 12d is preferably made of a galvanized steel plate with a thickness of about 9 mm, and is formed to have a rectangular or square planar shape with a side of about 250 to 280 mm, for example. . The pedestal plate member 12d has four outer fastening holes 12c arranged inside four corner portions corresponding to the positions of the four male threaded bolt members 12a. Inside the four outer fastening holes 12c, four inner fastening holes 12e are arranged at the corners of an imaginary rectangle measuring, for example, about 60 mm in length and about 105 mm in width. It is formed.

A male threaded portion of the male threaded bolt member 12a is inserted into each outer fastening hole 12c, and a pair of nut members 12b screwed into the male threaded portion are tightened with the pedestal plate member 12d sandwiched therebetween. . As a result, the height of the pedestal plate member 12d from the inner surface of the existing tunnel lining body 55 is adjusted as appropriate, and the inclination is adjusted appropriately, and the pedestal plate member 12d is spaced apart from the existing tunnel lining body 55. It becomes possible to fix it. Note that the predetermined position where the pedestal plate member 12d is fixed has priority over the position where the male threaded bolt member 12a is buried, so if the male threaded bolt member 12a is fixed at a position shifted from the predetermined position, At the installation site, by widening or re-opening the outer fastening hole 12c, the male threaded portion of the male threaded bolt member 12a that has shifted in position is inserted, and the pedestal plate member 12d is accurately installed in a predetermined position. You can do it like this.

In each inner fastening hole 12e, the other flange portion 11b, which becomes the joint surface portion of the steel supporting member 11, is sandwiched between the base plate member 12d and the sandwiching main body portion 15a of the above-mentioned sandwiching plate piece 15. In this state, the bolt/nut member 16 inserted through the matching inner fastening hole 12e and the fastening hole 15b of the sandwiching plate piece 15 is tightened. As a result, the steel support member 11 is attached to the pedestal plate member 12d, which has been accurately attached to a predetermined position, and the inner periphery of the existing tunnel lining body 55, with the installation position of the panel attachment surface 11a further adjusted. It becomes possible to attach it along the shape.

In this embodiment, a plurality of covering panel members 13 are attached so as to straddle the panel attachment surfaces 11a of each pair of adjacent steel supporting members 11, respectively, as shown in FIGS. 7(a) to (d). The panel member is preferably made of fiber-reinforced concrete and has a thickness of, for example, about 20 mm. The covering panel member 13 has a size of approximately 870 mm, which is slightly smaller than the center-to-center pitch of the steel supporting members 11 in the extending direction It has a rectangular planar shape with a width in the extension direction X of about 470 mm and a vertical width in the continuous direction Y, which is the circumferential direction, of about 470 mm.

In addition, the covering panel member 13 has an uneven surface 13a on the back side that is arranged facing the inner wall surface 51 of the existing tunnel lining 55, and the uneven surface 13a is arranged, for example, evenly distributed. It is formed by a large number of sinkholes 13b. In this embodiment, the sinkhole 13b is a hexagonal or circular sinkhole. By forming the uneven surface 13a on the back side of the covering panel member 13, the adhesion area for the non-shrinkage mortar 14 that is later injected and filled is increased, and the non-shrinkage mortar 14 is more firmly attached to the back side of the covering panel member 13. It becomes possible to attach it. In addition, since the uneven surface 13a is formed by a large number of hexagonal or circular sinkholes 13b evenly distributed, sharp corners are eliminated, and the non-shrinkage mortar 14 in the sinkhole 13b is It becomes possible to firmly integrate the non-shrinkage mortar 14 to the back surface of the covering panel member 13 without leaving any unfilled areas.

Furthermore, in the present embodiment, anchor bars 13e (see FIGS. 9(b) and 10) as anchor members are preferably provided on the back side of the existing tunnel lining body 55 facing the inner wall surface 51. A nut member 13c for attaching is embedded and fixed. The nut member 13c is a flanged nut with a size of about M10. The nut members 13c have their flange portions buried in fiber-reinforced concrete and are fixed at four locations in a dispersed manner with female screw holes opened on the back side. Each nut member 13c has an anchor bar 13e bent in an L-shape and having a thickness of about D10, for example, in the space between the covering panel member 13 and the inner wall surface 51 of the existing tunnel lining body 55. 56 and can be removably attached.

The plurality of covering panel members 13 are supported by the steel support member 11 using, for example, a pressing fixing member 20 described later, and are attached to a portion above the inverted concrete portion 57 of the tunnel 50, as shown in FIGS. 1 and 8. They are arranged in succession in the circumferential direction along the inner wall surface 51 of the tunnel 50 from the side wall portion to the upper portion. The covering panel member 13', which is the center panel of the plurality of covering panel members 13 arranged in series and arranged at the top end of the tunnel 50, is preferably filled with non-shrinkage mortar as a curable material. A mortar supply hole 13d having a size of approximately φ60 is formed to supply and fill the mortar 56. The mortar supply hole 13d can be closed so as to be openable and closable using, for example, a socket member.

In this embodiment, the covering panel member 13 is preferably formed using fiber-reinforced concrete so as to have a flat rectangular planar shape. The covering panel member 13 can also be formed to have a curved shape that follows the curved shape of the curved cross-sectional portion of the tunnel 50. By forming the covering panel member 13 to have a curved shape that follows the curved shape of the curved cross-sectional portion of the tunnel 50, a stronger arch action effect can be exerted against external forces from the ground side. It becomes possible.

In the reinforcing structure 10 for an existing tunnel of this embodiment, as shown in FIGS. The above-mentioned covering panel member 13 is installed so as to straddle the panel mounting surface 11a of each adjacent pair of steel supporting members 11 of a plurality of steel supporting members 11 made of I-shaped steel installed along the inner wall surface 51 of the , a plurality of them are attached in succession in the circumferential direction, and as shown in FIG. A reinforcing lining body 58 is formed by filling and hardening the non-shrinkage mortar 14.

In this embodiment, the covering panel member 13 is used for fixing the covering panel member 13 in a pressed state against the panel mounting surface 11a of the steel support member 11, as shown in FIGS. 9(a) to 9(c). , are attached to each other in a state in which they are supported by the steel supporting member 11 in a continuous manner in the circumferential direction using the pressing fixing member 20. The pressing and fixing member 20 is made of a square pipe having a rectangular cross section with a side of approximately 60 mm, for example, and is larger than the distance between the outer sides of the panel mounting surfaces 11a of each adjacent pair of steel support members 11. It has a slightly longer length of about 1100mm. The pressing fixing member 20 extends in the tunnel extension direction The steel supporting member 11 is attached so as to intersect perpendicularly with each of the steel supporting members 11.

The pressing fixing member 20 tightens a fixing bolt member 22, which is screwed onto a nut member 21 fixed to the panel mounting surface 11a of the steel support member 11 and includes, for example, a rib washer or a tightening nut, to the nut member 21. By tightening the ends of both sides to the steel supporting member 11 so as to sandwich them between the rib washers, each covering panel member 13 installed in succession is pressed against the steel supporting member 11. It can be firmly fixed. In this embodiment, each pair of covering panel members 13 adjacent to each other in the tunnel extension direction By arranging the pressing fixing members 20 that press down each of the covering panel members 13 so as to be shifted up and down in the center portion of the covering panel member 13 in the vertical and width direction, the pressing fixing members 20 are arranged at the center of these adjacent covering panel members 13. The ends of a pair of pressing fixing members 20 that press down these adjacent covering panel members 13, respectively, can be simultaneously fastened to the steel support member 11 by a single fixing bolt member 22 via a rib washer. It has become. Since the covering panel member 13 can be supported by these pressing fixing members 20, nut members 21, and fixing bolt members 22, a member for attaching the covering panel member 13 inside these members after the day's work is completed. This makes it possible to reliably avoid situations where, for example, the vehicle limits are violated due to the absence of the vehicle.

By attaching a plurality of covering panel members 13 to the panel mounting surface 11a of the steel supporting member 11 in a row in the circumferential direction using the pressing fixing member 20 and the fixing bolt member 22, each adjacent pair of steel A space between the attached covering panel member 13 and the inner circumferential surface of the existing tunnel lining 55 is filled in a portion sandwiched by the supporting members 11 with a hardening material, preferably a non-shrinking mortar 14. 56 is formed. By attaching the anchor lines 13e to the back side of the covering panel member 13, these anchor lines 13e can be made to protrude into the space 56 filled with the curable material 14. The anchor bars 13e can enhance the integrity of the covering panel member 13 and the non-contraction mortar 14 filled in the space 56. From the viewpoint of effectively increasing the integrity of the covering panel member 13 and the non-shrinking mortar 14, and from the viewpoint of preventing interference between the upper and lower covering panel members 13, 13, the anchor bars 13e are bent in an L-shape. It is preferable that the bending direction is along the tunnel extension direction X (see FIG. 9(b)).

Further, reinforcing bars may preferably be placed inside the space 56 filled with the hardenable material 14 before the covering panel member 13 is attached to the panel mounting surface 11a of the steel support member 11. can. By disposing reinforcing bars inside the space 56 filled with the curable material 14, the strength of the reinforcing lining body 58 to be formed can be effectively increased.

Furthermore, in this embodiment, as shown in FIG. Preferably, a lower anchor member 19 is attached. The lower anchor member 19 is made of a reinforcing bar with a thickness of approximately D19, for example, and is made of an anchor bar for the purpose of improving the shear strength at the interface between the hardenable material 14 and the tunnel lining body 55 and integrating the two by improving the adhesion force. Like 13e, it has an L-shaped bent shape. As described above, the lower anchor member 19 is preferably an anchor bolt whose base is embedded and fixed in the concrete portion of the existing tunnel lining 55 made of reinforced concrete segments or synthetic segments. are fixed to three locations on each of the side walls on both sides, with the bending direction along the circumferential direction of the tunnel 50. Since the lower anchor member 19 is provided to protrude from the lower part of the existing tunnel lining 55 into the space 56 filled with the hardenable material 14, a large load including the own weight of the reinforcing lining 58 can be avoided. To effectively reinforce the interface between the lower part of the reinforcing lining 58 and the existing tunnel lining 55, where the reinforcing lining 58 acts, and form a coupled structure between the two to form a strong lining. becomes possible.

According to the reinforcing structure 10 for an existing tunnel of the present embodiment, the covering is arranged in a continuous manner in the circumferential direction of the portion sandwiched between each adjacent pair of steel supporting members 11 formed as described above. By filling each of one or more spaces 56 between the panel member 13 and the existing tunnel lining 55 with non-shrinkage mortar 14 as a curable material, the existing tunnel lining having a curved cross-sectional shape is A reinforcing lining body 58 can be formed to cover the inner peripheral surface of the tunnel lining body 55.

That is, among the plurality of covering panel members 13 arranged in series in the circumferential direction, a covering panel member 13' arranged at the top end of the upper part of the tunnel 50 has the curable material 14 in the space 56. Since mortar supply holes 13d for supplying mortar are formed (see FIG. 1), mortar supply pipes (not shown) are connected to these mortar supply holes 13d to supply non-shrinkage mortar 14. , the space 56 between the covering panel member 13 and the existing tunnel lining 55 can be filled with non-shrinkage mortar 14. When the filled non-shrinkage mortar 14 hardens and becomes integrated with the covering panel member 13, the fixing bolt members 22 and pressing fixing members 20 that fasten and fix the covering panel member 13 to the steel support member 11 are removed. As a result, a reinforcing lining body 58 that covers the inner circumferential surface of the existing tunnel lining body 55, in which the steel supporting member 11, the plurality of covering panel members 13, and the hardened non-shrinkage mortar 14 are integrated, is formed. It will be easily formed.

Therefore, according to the present embodiment, a plurality of steel supporting members 11 each having a panel mounting surface 11a on the inside are arranged and fixed at a plurality of locations on the inner peripheral portion of the existing tunnel lining 55 having a curved cross-sectional shape. The process of installing supporting members by extending in the circumferential direction at predetermined intervals in the extending direction X of the tunnel 50 through the mounting seats 12 provided in A panel member installation step in which a plurality of covered panel members 13 are supported by the steel supporting member 11 and installed in succession in the circumferential direction so as to straddle the panel mounting surface 11a of the steel supporting member 11, and the covering panel member 13 and a backfilling step of filling the space between the steel supporting member 11, the covering panel member 13, and the existing tunnel lining 55 with a curable material 14 that integrates the steel supporting member 11, the covering panel member 13, and the existing tunnel lining 55; By the method for reinforcing an existing tunnel including .

According to the reinforcing structure for an existing tunnel according to the present embodiment having the above-described configuration, a reinforcing cover for reinforcing an existing tunnel lining formed along the inner circumferential surface of a tunnel having a curved cross-sectional shape is provided. It becomes possible to efficiently reinforce the workpiece using a steel support member and a hardenable material, preferably by repeating the work over several hours, and it also becomes possible to form the workpiece with higher precision.

That is, according to the reinforcing structure for an existing tunnel of the present embodiment, the tunnel can be strengthened through the mounting seats 12 arranged and fixed at a plurality of locations on the inner peripheral portion of the existing tunnel lining 55 having a curved cross-sectional shape. 50 at predetermined intervals in the extension direction It is configured to include a plurality of covering panel members 13 that are attached in series in the circumferential direction, and a curable material 14 that is filled in a space 56 between the covering panel members 13 and the existing tunnel lining body 55. has been done.

As a result, according to the present embodiment, each of the mounting seats 12 can be installed in advance at a predetermined position on the inner peripheral portion of the existing tunnel lining body 55 with high precision while repeating the work in a short time. The steel supporting member 11 can be supported on the mounting seat 12 installed in advance and mounted with high accuracy without performing any special processing on the steel supporting member 11, and the plurality of covered panel members 13 can be mounted with high precision. Since the installed steel support members 11 can be attached with high accuracy by being connected in the circumferential direction while repeating short-time work, for example, each span of each adjacent pair of steel support members 11 can be attached with high precision. By filling the curable material 14 into the tunnel, a reinforcing lining 58 covering the inner circumferential surface of the existing tunnel lining 55 can be efficiently formed, preferably by repeating the work over several hours. It becomes possible to reinforce the tunnel lining body 55 of the present invention, and it also becomes possible to form the reinforcing lining body 58 with higher precision.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the reinforcing structure for an existing tunnel according to the present invention does not necessarily need to be constructed by repeating work over several hours, but only if it can be constructed while repeating work over several hours. Depending on the construction conditions, the work may take more than several hours. The tunnel in which the existing tunnel lining is reinforced may be a mountain tunnel other than a shield tunnel, or a tunnel having various other curved cross-sectional shapes. The existing tunnel lining may be made of steel, cast iron, etc. in addition to concrete. The male threaded bolt member may be fixed to the existing tunnel lining by welding or the like in addition to anchor bolts. The steel supporting member does not necessarily have to be I-beam steel or H-beam steel, but may be any other type of steel member such as channel steel or angle steel that can have a panel mounting surface on the inside. Also good. The covering panel member does not necessarily need to be a member made of fiber-reinforced concrete, and may be made of other materials such as synthetic resin, steel, or cast iron. The anchor member attached to the covering panel member does not necessarily have to be bent into an L-shape, and may be a straight member or a fixing plate fixed to the tip of the straight member. The curable material filled in the space between the covering panel member and the inner wall surface of the tunnel includes non-shrinkage mortar, ordinary mortar, concrete, cement milk, and other cement-based curable materials and non-cement-based curable materials. It may be.

10 Reinforcement structure of existing tunnel 11 Steel support members (I-shaped steel)
11a Panel mounting surface (one flange part)
11b Joint surface part (other flange part)
12 Mounting seat 12a Male screw bolt member 12b Nut member 12c Outer fastening hole 12d Pedestal plate member 12e Inner fastening hole 13 Covering panel member 13a Uneven surface 13b Sink hole 13c Nut member 13d Mortar supply hole 13e Anchor bar 14 Non-shrinkage mortar (hardened) material)
15 Sandwich plate piece 15a Sandwich main body 15b Fastening hole 15c Spacer rib 16 Bolt nut member 17 Telescopic jack 18 Length adjustment plate 19 Lower anchor member 20 Pressing fixing member 21 Nut member 22 Fixing bolt member 50 Tunnel 51 Inner wall surface 55 Existing tunnel Lining body 56 Space 57 Invert concrete section 58 Reinforcement lining body 59 Secondary shotcrete X Tunnel extension direction Y Direction of continuous installation of covering panel members

Claims (8)

A reinforcement structure for an existing tunnel for reinforcing an existing tunnel lining provided in a tunnel having a curved cross-sectional shape,
The tunnel lining can be installed circumferentially at predetermined intervals in the extending direction of the tunnel by using mounting seats arranged and fixed at multiple locations on the inner circumferential portion of the existing tunnel lining having a curved cross-sectional shape. a plurality of steel shoring members having internal panel mounting surfaces attached thereto;
A plurality of covering panel members are supported by the steel supporting members and attached in succession in the circumferential direction so as to straddle the panel mounting surfaces of each pair of the steel supporting members adjacent in the extending direction of the tunnel. and,
A curable material that fills a space between the covering panel member and the existing tunnel lining and integrates the steel supporting member, the covering panel member, and the existing tunnel lining. It consists of
A pressing fixing member is fastened to the steel supporting member at a predetermined interval in the circumferential direction at the center portion in the width direction of the inner surface of one flange portion of the steel supporting member that serves as the panel mounting surface. The nut member to be attached is fixed,
The covering panel member is connected in a circumferential direction to the steel supporting member using the pressing fixing member for fixing the covering panel member in a pressed state against the panel mounting surface of the steel supporting member. Each is attached in a supported state,
The pressing fixing member is formed by screwing and tightening a fixing bolt member having a rib washer or a tightening nut into the nut member fixed to the panel mounting surface of the steel supporting member. The plurality of consecutive covering panel members are pressed against the steel supporting member by tightening both ends of the pressing fixing member to the steel supporting member so as to be sandwiched between them and the nut. It is fixed in the state
The steel supporting member is formed by a plurality of unit steel supporting members that are integrated by connecting end faces of the existing tunnel lining body to each other in the circumferential direction, and has at least one joint point. A telescopic jack is attached to which both ends are connected to the pair of adjacent unit steel supporting members and can adjust the length in the circumferential direction of the steel supporting member, and the steel supporting member is pushed and expanded by the telescopic jack. A reinforcing structure for an existing tunnel, in which one or more length adjustment plates are sandwiched between a pair of end faces. The mounting seat has a height adjusted by a plurality of male threaded bolt members protruding inwardly from the existing tunnel lining and fixed, and a nut member screwed onto the male threaded bolt members. and a pedestal plate member having a plurality of fastening holes, which is fastened to the base plate member.
The steel supporting member is joined to the pedestal plate member of the mounting seat, so that the installation position of the panel mounting surface is adjusted, and the steel supporting member is attached to the inner peripheral shape of the existing tunnel lining. The reinforcing structure for an existing tunnel according to claim 1, wherein the reinforcing structure is attached to an existing tunnel. The steel support member is made of I-beam steel or H-beam steel, and one flange portion is arranged inside as the panel mounting surface, and the other flange portion is disposed inside as the joint surface portion of the pedestal plate member of the mounting seat. The mounting seat includes a sandwiching plate piece having a fastening hole and a bolt/nut member, and the other flange portion is arranged in contact with the pedestal plate member and the sandwiching plate. By tightening the bolt and nut members into the fastening holes of the pedestal plate member and the sandwiching plate piece while being sandwiched between the steel supporting member and the pedestal plate member of the mounting seat, The reinforcing structure for an existing tunnel according to claim 2, wherein the reinforcing structure for an existing tunnel is joined to. The sandwich plate piece has a height similar to the thickness of the other flange portion, which is integrally attached to the flat plate-shaped sandwich main body and the edge portion of the surface of the sandwich main body on the pedestal plate member side. The reinforcing structure for an existing tunnel according to claim 3, further comprising a spacer rib having a spacer rib. The existing tunnel lining is formed of reinforced concrete segments or synthetic segments, and the male threaded bolt members are anchor bolts whose bases are buried and fixed in the concrete parts of these segments. The reinforcing structure for an existing tunnel according to any one of claims 2 to 4. The reinforcing structure for an existing tunnel according to any one of claims 1 to 5, wherein a lower anchor member is attached to protrude into the space from a lower part of the existing tunnel lining and to be embedded in the curable material. . The existing tunnel lining is formed of reinforced concrete segments or synthetic segments, and the lower anchor member is fixed by anchor bolts whose bases are buried in the concrete parts of these segments. The reinforcing structure for an existing tunnel according to claim 6. A method for reinforcing an existing tunnel for reinforcing an existing tunnel lining using the existing tunnel reinforcing structure according to claim 1, comprising:
A plurality of steel supporting members each having a panel mounting surface on the inside are arranged and fixed at a plurality of locations on the inner circumferential portion of the existing tunnel lining having a curved cross-sectional shape. A support member installation step that extends and attaches in the circumferential direction at predetermined intervals in the extension direction;
A plurality of covered panel members are supported by the steel supporting members and installed in a circumferentially continuous manner so as to straddle the panel mounting surfaces of each pair of the steel supporting members adjacent in the extending direction of the tunnel. Panel member installation process,
A backing for filling a space between the covering panel member and the existing tunnel lining with a curable material that integrates the steel supporting member, the covering panel member, and the existing tunnel lining. A method for reinforcing an existing tunnel, which includes a filling process.

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