JP2022145315A - Reinforcement structure with drainage function for existing tunnel - Google Patents

Abstract

To provide a reinforcement structure with a drainage function for an existing tunnel allowing exudate water bleeding through a connection part between segments in a longitudinal direction to be discharged smoothly in a simple configuration.SOLUTION: In a timbering body 11, a fixing surface part 11b is placed so as to cover a connection part 60 between segments 59 in a longitudinal direction configuring a tunnel liner body 55, and is fixed along an inner peripheral surface of the tunnel inner body 55 in a state where a separation part 61 between the fixing surface part 11b and the tunnel liner body 55 is maintained. A pair of linear cutoff members 62 are consecutively attached in a peripheral direction on both sides clamping the connection part 60 in a tightly contacted state to both of the fixing surface part 11b and the tunnel liner body 55. A portion between the pair of attached linear cutoff members 62 allows exudate water to be guided downward as a discharge channel 63. A lower end part of the discharge channel 63 is in communication with an inner space of a shield tunnel 50 to discharge the guided exudate water.SELECTED DRAWING: Figure 11

Description

There is an application for the application of Article 30, Paragraph 2 of the Patent Act ・Civil Engineering Construction Vol. 61, No. 7, Vol. 75th Annual Academic Lecture [Summary of Lectures] DVD-ROM version (published by the Japan Society of Civil Engineers on August 1, 2020)

TECHNICAL FIELD The present invention relates to a reinforcing structure with a drainage function for an existing tunnel, and particularly in an existing tunnel in which a tunnel lining body is formed by segments, a drainage function for an existing tunnel that enables drainage of seepage water from joints between the front and rear segments. Reinforcement structure with.

When an existing tunnel ages, the segments that cover the inner wall of the tunnel and the tunnel lining made of concrete, for example, may crack or corrode due to the effects of consolidation settlement of the surrounding ground or salt damage in areas near the sea. Damaged areas may occur.

As a repair method when the existing tunnel lining is damaged due to cracks, corrosion, etc., a support material (supporting material) or It is conceivable to newly form a lining for reinforcement using concrete (hardening material) or the like (see, for example, Patent Document 1).

JP-A-2001-271599

On the other hand, for an existing tunnel that has deteriorated, a tunnel lining body that covers the inner surface of the tunnel is formed by assembling a plurality of segments in the circumferential direction and the longitudinal direction (axial direction) of the tunnel, for example, by a shield construction method. In this case, it is conceivable that exudate seeps out, particularly from the joints between the front and rear segments. There is a demand for the development of a technology that enables the discharge of

The present invention is intended to smoothly discharge exudate water that seeps out from a reinforcing lining formed on the inner surface of a tunnel lining made of segments, especially through joints between the front and rear of the segments, with a simple structure. To provide a reinforcement structure with a drainage function for an existing tunnel capable of

In an existing tunnel having a tunnel lining formed of segments, the present invention is provided when forming a reinforcing lining on the inner surface of the tunnel lining, and A reinforcing structure with a drainage function for an existing tunnel that can drain exudate from the a support body, a plurality of panel members supported by the support body and connected in a circumferential direction so as to straddle the panel mounting surface portions of a pair of support bodies adjacent to each other in the front-rear direction; and the tunnel lining, and a curable material that integrates the support, the panel member, and the tunnel lining. A fixed surface portion is arranged to cover a joint portion between the front and rear segments of the tunnel lining body, and in a state in which a separation portion is held between the fixed surface portion and the tunnel lining body, It is fixed along the inner peripheral surface of the tunnel lining body, and a pair of linear impermeable members are provided on both sides of the joint portion extending in the circumferential direction at the spaced portion, the fixed surface portion and the It is attached continuously in the circumferential direction from the upper end to the lower end of the support in a state of being in close contact with both of the tunnel linings, and the pair of linear impermeable members attached part of the tunnel is used as a drainage channel, and the lower end of the drainage channel communicates with the inner space of the existing tunnel so that the guided seepage water can be discharged. The above object has been achieved by providing a reinforcement structure with a drainage function for existing tunnels.

In the reinforcing structure with a drainage function for an existing tunnel of the present invention, a base plate member is attached to the inner surface of the tunnel lining while maintaining a gap between it and the inner surface of the tunnel lining. By fixing the fixed surface portion to the base plate member, the tunnel lining body is supported while the supporting body holds the separation portion between the fixed surface portion and the tunnel lining body. It is preferably fixed along the inner peripheral surface.

Further, in the reinforcing structure with a drainage function for an existing tunnel of the present invention, it is preferable that the linear impermeable member is made of a impermeable packer.

Further, in the reinforcing structure with a drainage function for an existing tunnel of the present invention, it is preferable that a waterproof adhesive is applied along the side surface of the linear impermeable member opposite to the drainage channel. .

Furthermore, in the reinforcing structure with a drainage function for an existing tunnel of the present invention, the support is made of I-shaped steel or H-shaped steel, the inner flange is the panel mounting surface portion, and the outer flange is the fixing surface portion. It is preferable that

According to the reinforcing structure with a drainage function for an existing tunnel of the present invention, exudate seeps out from the reinforcing lining body formed on the inner surface of the tunnel lining body by segments, particularly through the joints between the front and rear segments. can be discharged smoothly with a simple configuration.

1 is a schematic cross-sectional view of a shield tunnel illustrating an existing tunnel lining reinforced by a reinforcing structure with drainage function for an existing tunnel according to a preferred embodiment of the present invention; FIG. FIG. 2 is an enlarged view of part A in FIG. 1; (a) is an enlarged view of the B part in FIG. 2 before the panel member is attached, (b) is a cross-sectional view along CC of (a), and (c) is the front view of (a) from the left side. It is a diagram. (a) is a plan view and (b) is a side view for explaining the sandwiching plate piece. FIG. 4 is a schematic side view of a support body formed by connecting a plurality of support pieces; FIG. 2(a) is a cross-sectional view of the support, and FIG. 2(b) is a partial inner view of the support, explaining a nut member fixed to the panel mounting surface of the support; (a) is a front view of the panel member, (b) is a rear view, (c) is a cross-sectional view taken along line DD of (b), and (d) is an enlarged view of part E of (c). FIG. 10 is a development arrangement view of panel members for explaining a state in which a plurality of panel members are continuously arranged in the circumferential direction along the inner peripheral surface of an existing tunnel lining body. A state of attaching a plurality of panel members so as to straddle the panel attachment surfaces of a pair of supports will be explained. (c) is a partially schematic cross-sectional view taken along line GG in (a). FIG. 2 along HH in FIG. 2 illustrating a reinforcing structure with drainage function for an existing tunnel according to a preferred embodiment of the present invention, with a pressing fixing member attached and a hardening material filled and solidified; It is a longitudinal cross-sectional view. FIG. 2 is a partial vertical cross-sectional view and an enlarged view of part I for explaining a main part of a reinforcement structure with a drainage function for an existing tunnel according to a preferred embodiment of the present invention; FIG. 10 is an enlarged cross-sectional view illustrating a main part of a reinforcement structure with a drainage function for an existing tunnel according to another embodiment;

As shown in FIG. 1, the reinforcement structure 10 with a drainage function for an existing tunnel according to a preferred embodiment of the present invention covers an inner wall surface 51 of a shield tunnel having, for example, a circular cross-sectional shape as an existing tunnel 50. To efficiently reinforce the tunnel lining 55 made of reinforced concrete segments or synthetic segments by using a hardening material 14 (see FIG. 10), preferably a cement-based hardening material such as non-shrinking mortar. It was adopted as the structure of That is, in this embodiment, the shield tunnel 50 is used as a railway tunnel for a subway, for example, and since a considerable period of time has passed since the start of service, damage due to cracks, corrosion, etc. due to aging has occurred. Therefore, by adopting the reinforcing structure 10 with a drainage function for the existing tunnel of this embodiment, the tunnel lining 55 with the damaged part is replaced with a reinforcing lining 58 (see FIG. 10) It is reinforced by In addition, the reinforcing structure 10 with a drainage function for the existing tunnel of this embodiment is formed by the segment 59 from the reinforcing lining 58 formed on the inner surface of the tunnel lining 55, particularly the joint 60 between the front and rear of the segment 59. (Refer to FIG. 10).

The reinforcing structure 10 with a drainage function for an existing tunnel of the present embodiment is an existing tunnel in which the tunnel lining body 55 is formed by the segments 59, for example, in the shield tunnel 50 that constitutes a railway tunnel having a circular cross-sectional shape, A reinforcing structure with a drainage function that is provided when forming a reinforcing lining body 58 on the inner surface of the tunnel lining body 55 and that can drain water seeping from the joint 60 between the front and rear segments 59 in particular. A plurality of support bodies 11 which are attached at predetermined intervals in the extension direction X of the tunnel (see FIG. 10) and which have a panel mounting surface portion 11a on the inside and a fixing surface portion 11b on the outside are adjacent to each other in the front and rear direction. A plurality of panel members 13 supported by the support members 11 and attached in series in the circumferential direction so as to straddle the panel mounting surface portions 11a of the pair of support members 11 (see FIGS. 9(a) to 9(c)). and a curable material that fills the space 56 (see FIG. 2) between the panel member 13 and the tunnel lining 55 to integrate the support 11, the panel member 13, and the tunnel lining 55. 14 (see FIG. 10). As shown in FIGS. 10 and 11, the support body 11 is arranged such that the fixed surface portion 11b covers the joint portion 60 between the front and rear segments 59 constituting the tunnel lining 55, and the fixed surface portion 11b and It is fixed along the inner peripheral surface of the tunnel lining 55 while holding the separation portion 61 (see FIGS. 2 and 3A) between the tunnel lining 55 and the tunnel lining 55 . A pair of linear impermeable members 62 are in close contact with both the fixed surface portion 11b and the tunnel lining body 55 on both sides of the joint portion 60 between the front and rear segments 59 extending in the circumferential direction in the spaced portion 61. 11), it is continuously attached in the circumferential direction from the upper end to the lower end of the support 11 (see FIGS. 1 and 2). The portion between the pair of attached linear impermeable members 62 is used as a drainage channel 63 to guide the seepage water downward, and the lower end of the drainage channel 63 communicates with the inner space of the shield tunnel 50. It is designed so that the introduced seepage water can be discharged.

Further, in this embodiment, as shown in FIGS. is the fixed surface portion 11b.

Furthermore, in this embodiment, as shown in FIGS. 2 and 3(a) and (b), the base plate member 12 is provided inside the tunnel lining 55 between the inner surface of the tunnel lining 55 and the base plate member 12. The fixed surface portion 11b is fixed to the base plate member 12, so that the support body 11 holds the separation portion 61 between the fixed surface portion 11b and the tunnel lining body 55. It is fixed along the inner peripheral surface of the tunnel lining body 55 in this state.

In this embodiment, the tunnel lining 55 covering the inner wall surface 51 (see FIGS. 1 and 2) of the shield tunnel 50 is preferably a reinforced concrete segment or a synthetic segment as the segment 59. Since the shield tunnel 50 has an inner wall surface 51 with a circular cross-sectional shape, for example, it has an inner peripheral surface with a cross-sectional shape in which at least the upper portion is curved. An anchor hole is drilled to a predetermined depth in the exposed portion of the concrete on the inner surface of the tunnel lining 55 by the segment 59, and preferably the base of the anchor bolt is embedded and fixed in the drilled anchor hole. The male screw bolt member 12a (see FIGS. 3(a) and 3(b)) for supporting and fixing the face plate portion 12d of the base plate member 12 at a predetermined height position is held at a predetermined position by the projecting portion of these anchor bolts. can be easily and accurately attached to the

Also, in this embodiment, the support 11 is preferably made of galvanized I-beam or H-beam (in this embodiment, H150×75 I-beam), with an inner flange defining the panel mounting surface 11a. formed. For example, as shown in FIG. 5, the support 11 made of I-shaped steel is preferably prepared in advance in a factory or the like from the side wall portion of the tunnel 50 above the bottom inverted concrete portion 57 (see FIG. 1) to the upper portion. The shape along the inner peripheral surface of the existing tunnel lining body 55 up to this point is processed into shapes that are appropriately divided and carried into the site as a plurality of support pieces 11'. The support body 11 is formed by a plurality of support pieces 11' which are integrated by connecting end faces to each other by a known method using bolt members or the like, and extends from the side wall portion of the tunnel 50 to the upper portion. It can be easily installed by extending in the circumferential direction along the inner wall surface 51 . For example, a plurality of supports 11 made of I-shaped steel are installed in the extension direction X of the tunnel 50 at a predetermined center-to-center pitch of about 900 mm.

Further, in the present embodiment, the inner surface of the inner flange serving as the panel mounting surface 11a of the support 11 preferably has a width in the direction Y (see FIG. 9A) of the panel member 13, which will be described later, in the circumferential direction. As shown in FIGS. 5 and 6 (a) and (b), a nut member 21 for fastening a pressing fixing member 20 to the support body 11, which will be described later, preferably extends in the width direction. It is fixed by welding or the like to the central part of the

In this embodiment, the supports 11 made of I-shaped steel are preferably arranged and fixed at predetermined intervals in the extension direction X and the circumferential direction of the tunnel on the inner surface of the existing tunnel lining 55. By interposing a plurality of pedestal plate members 12 (see FIGS. 3A to 3C) having a face plate portion 12d, the tunnel 50 is extended in the circumferential direction at predetermined intervals in the extension direction X to improve accuracy. It will be installed in a good and stable state.

The face plate portion 12d that constitutes the base plate member 12 is preferably made of a galvanized steel plate having a thickness of about 9 mm, and has a rectangular or square planar shape with a side of about 250 to 280 mm, for example. is formed as In the face plate portion 12d, four outer fastening holes 12c are arranged inside the four corner portions so as to correspond to the positions of the male screw bolt members 12a by the projecting portions of the anchor bolts. ing. Inside the four outer fastening holes 12c, for example, the four inner fastening holes 12e are arranged at the corners of an imaginary rectangle having a size of about 60 mm in length and about 105 mm in width, and are each opened. formed.

The male screw bolt members 12a of the above-described anchor bolts are inserted into the four outer fastening holes 12c formed with openings, and the face plate portion 12d is sandwiched by a pair of nut members 12b screwed to each of the male screw bolt members 12a. By fastening these nut members 12b around the outer fastening holes 12c, the height of the face plate portion 12d constituting the base plate member 12 from the inner surface of the existing tunnel lining body 55 can be appropriately adjusted. In addition to being adjustable, it is possible to accurately fix at a predetermined position separated from the existing tunnel lining body 55 in a state in which the inclination is appropriately adjustable. The predetermined position where the face plate portion 12d is fixed has priority over the position where the male screw bolt member 12a is embedded. 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 been displaced can be inserted so that the face plate portion 12d can be attached at a predetermined position with high accuracy. can do.

In addition, in the four inner fastening holes 12e formed in each face plate portion 12d, a fixing surface portion of the support body 11 is provided between the face plate portion 12d and the sandwiching body portion 15a of the sandwiching plate piece 15 described above. The bolt and nut member 16 inserted through the matching inner fastening hole 12e and the fastening hole 15b of the sandwiching plate piece 15 (see FIGS. 4A and 4B) with the outer flange 11b sandwiched therebetween. , is fastened. As a result, the support body 11 can be easily fixed along the inner surface shape of the existing tunnel lining body 55 in a state in which the position of the face plate portion 12d of the base plate member 12 with which the fixing surface portion 11b of the support body 11 contacts is adjusted. As a result, it can be stably supported on the base plate member 12 which is attached in advance at a predetermined position with high accuracy.

In this embodiment, prior to the work of installing the support 11 along the inner peripheral surface of the existing tunnel lining 55, the support 11 is placed in advance at predetermined positions at predetermined intervals in the extension direction X and the circumferential direction of the tunnel. By utilizing the pedestal plate member 12 having the above-described face plate portion 12d, which is positioned and fixed with high precision, the support 11 preferably made of I-beam or H-beam steel can be obtained while repeating operations preferably in a short time. can be smoothly attached along the inner surface of the existing tunnel lining 55 in the circumferential direction with good accuracy. Further, by using these base plate members 12, as shown in FIGS. 11b is arranged, and the separation portion 61 is held between the fixing surface portion 11b and the tunnel lining 55, so that it can be smoothly fixed along the inner peripheral surface of the tunnel lining 55. Become.

In this embodiment, as described above, the segment 59 is arranged so as to cover the joint 60 between the front and rear of the adjacent segments 59 , and in a state in which the spaced portion 61 is held between the tunnel lining 55 and the tunnel lining 55 . As shown in FIGS. 10 and 11, a pair of The linear impermeable member 62 is in close contact with both the fixed surface portion 11b and the tunnel lining 55, and continues in the circumferential direction from the upper end portion to the lower end portion of the support body 11 (FIGS. 2), and can be attached on both sides of the joint 60 . A portion between the pair of linear impermeable members 62 thus attached can function as a drainage channel 63 .

Further, in this embodiment, preferably, a waterproof adhesive 64 is applied along the side surface of each attached linear waterproof member 62 on the side opposite to the drainage channel 63 .

Here, in this embodiment, as the linear water-impervious member 62, a water-impervious material that is lightweight and excellent in water-imperviousness, chemical resistance, flexibility and the like is preferably used. As a specific example thereof, it is possible to preferably use rubber or surface-coated polyethylene foam which is commercially available as a backup material (backer material) for construction work. Preferably, the linear impervious member 62 has a rectangular cross-sectional shape with a thickness greater than the interval width of the spaced portion 61 between the fixed surface portion 11b of the support body 11 and the inner surface of the tunnel lining body 55, for example. The upper end of the support body 11 is placed on both sides of the joint part 60 in a state of being in close contact with both the fixed surface part 11b and the tunnel lining body 55 by pushing it into the separation part 61 in a preferably compressed state. It can be easily installed continuously in the circumferential direction from the top to the bottom end. Moreover, preferably, the linear impermeable member 62 is elastically deformed even at the portion of the base plate member 12 to which the support body 11 is fixed, so that the surface plate portion 12d of the base plate member 12 and the inner surface of the existing tunnel lining member 55 are elastically deformed. By passing through the spaced portion between the two, it becomes possible to easily attach them continuously in the circumferential direction on both sides of the joint portion 60 .

Further, in this embodiment, an epoxy resin adhesive can be preferably used as the waterproof adhesive 64 that is applied along the side surface of each linear waterproof member 62 . A waterproof adhesive 64 is applied along the side surface of each linear water impermeable member 62 opposite to the drainage channel 63, thereby improving the water impermeability of the linear water impervious member 62. As a result, the exudate can be guided downward more smoothly through the formed drainage channel 63 .

Furthermore, in the present embodiment, the drainage channel 63 formed between the pair of attached linear impermeable members 62 preferably has a connecting pipe (not shown) that communicates with the lower end of the drainage channel 63. ) can be attached, for example, by extending a communicating connection pipe to the drainage grooves 57a (see FIG. 1) on both sides of the inverted concrete portion 57 formed inside the shield tunnel 50, Water can be easily discharged into the inner space of the shield tunnel 50 .

In the present embodiment, a plurality of panel members 13 attached so as to straddle the panel attachment surfaces 11a of each adjacent pair of supports 11 are, for example, as shown in FIGS. It is a panel member, preferably made of fiber-reinforced concrete, having a thickness of the order of 20 mm. The panel member 13 has a size that spans the panel mounting surfaces 11a of each adjacent pair of supports 11, and is about 870 mm in the extension direction X, which is slightly smaller than the pitch between the centers of the support bodies 11 in the extension direction X of the tunnel 50. It has a rectangular planar shape with a horizontal width and a vertical width of about 470 mm in the continuous arrangement direction Y, which is the circumferential direction.

In addition, the panel member 13 has an uneven surface 13a on the back side thereof, which is arranged to face the inner peripheral surface of the existing tunnel lining 55. The uneven surface 13a is arranged, for example, evenly distributed. formed by a large number of recessed holes 13b. In this embodiment, the sinkhole 13b is a hexagonal or circular sinkhole. The uneven surface 13a on the back side of the panel member 13 widens the adhesion area with the non-shrinkable mortar 14 to be injected and filled later, and the non-shrinkable mortar 14 is adhered to the back surface of the panel member 13 more firmly. becomes possible. In addition, since the uneven surface 13a is formed by a large number of hexagonal or circular recessed holes 13b that are evenly distributed, the non-shrinkage mortar 14 in the recessed holes 13b is prevented from forming by eliminating sharp corners. The non-shrinkable mortar 14 can be more strongly integrated with the back surface of the panel member 13 by preventing the occurrence of unfilled portions.

Furthermore, in the present embodiment, preferably, the back side of the existing tunnel lining 55 facing the inner peripheral surface is provided with an anchor bar 13e (see FIGS. 9B and 10) for attaching the anchor bar 13e. , the nut member 13c is embedded and fixed. The nut member 13c is a flanged nut having a size of about M10. The nut members 13c are dispersedly arranged and fixed at four locations in a state in which the flange portion is embedded in the fiber-reinforced concrete and the female screw hole is opened on the back side. Each nut member 13c is provided with an L-shaped bent anchor bar 13e having a thickness of about D10, for example, in a space 56 between the panel member 13 and the inner peripheral surface of the existing tunnel lining 55. can be detachably attached by protruding from the

The plurality of panel members 13 are supported by the support body 11 using, for example, pressing and fixing members 20 to be described later, and as shown in FIGS. Along the inner peripheral surface of the tunnel 50 up to the upper portion, they are continuously arranged in the circumferential direction. For the panel member 13 ′ arranged at the top end of the tunnel 50 , which is the central panel of the plurality of panel members 13 arranged in series, a hardening material, preferably non-shrink mortar, is applied in the space 56 . A mortar supply hole 13d having a size of about φ60 is formed to supply and fill the mortar. The mortar supply hole 13d can be closed so as to be opened and closed by using a socket member, for example.

In this embodiment, the panel member 13 is preferably made of fiber reinforced concrete and is formed to have a flat rectangular planar shape. The panel member 13 can also be formed with a curved shape that follows the curved shape of the curved cross-sectional portion of the tunnel 50 . By forming the panel member 13 so as to have a curved shape along the curved shape of the curved cross-sectional shape portion of the tunnel 50, it is possible to exhibit a stronger arch action effect against the external force from the natural ground side. become.

In the existing tunnel reinforcement structure 10 of the present embodiment, as shown in FIGS. A plurality of I-shaped steel supports 11 are installed along the inner wall surface 51 of the above-mentioned panel members 13 so as to straddle the panel mounting surfaces 11a of each adjacent pair of supports 11. , and as shown in FIG. 10, the space 56 between the attached panel member 13 and the existing tunnel lining 55 is filled with a hardening material, preferably non-shrink mortar 14. and hardening to form a reinforcing lining 58 .

In this embodiment, as shown in FIGS. 9A to 9C, the panel member 13 is a pressing fixing member for fixing the panel member 13 while being pressed against the panel mounting surface 11a of the support body 11. 20, they are attached in a state of being continuously arranged in the circumferential direction and supported by the support body 11. As shown in FIG. The pressing and fixing member 20 is made of, for example, a square pipe having a rectangular cross section with a side of about 60 mm, and is slightly longer than the space between the outer sides of the panel mounting surfaces 11a of each adjacent pair of supports 11. , with a length of the order of 1100 mm. The pressing fixing member 20 extends in the tunnel extension direction X at the central portion of the longitudinal width in the connecting direction Y of each of the panel members 13 arranged in series in the circumferential direction. It is attached so as to cross each of the supports 11 perpendicularly.

The pressing fixing member 20 is screwed to a nut member 21 fixed to the panel mounting surface 11a of the support body 11, for example, by tightening a fixing bolt member 22 having a rib washer or a tightening nut to the nut member 21. , rib washers and both ends are fastened to the support body 11 so as to firmly fix the continuous panel members 13 in a state of being pressed against the support body 11. can be done. In this embodiment, each pair of panel members 13 adjacent in the extension direction X of the tunnel is installed so as to straddle a pair of adjacent support bodies 11, and each step panel member 13 is connected in the circumferential direction. By arranging the pressing and fixing members 20 that press down on the central portion of the panel member 13 in the vertical width direction, these The ends of a pair of pressing fixing members 20 for pressing the adjacent panel members 13 can be simultaneously fastened by one fixing bolt member 22 via rib washers. Since the panel member 13 can be supported by the pressing fixing member 20, the nut member 21, and the fixing bolt member 22, there is a member for attaching the panel member 13 inside these members after finishing the work for the day. This makes it possible to reliably avoid, for example, infringing on vehicle limits.

A plurality of panel members 13 are attached to the panel mounting surface 11a of the support body 11 by using the pressing fixing member 20 and the fixing bolt member 22 so as to be sandwiched between each adjacent pair of support bodies 11. A space 56 is formed between the attached panel member 13 and the inner peripheral surface of the existing tunnel lining 55 at the portion where the tunnel lining is to be installed, and is filled with preferably non-shrinkable mortar 14 as a hardening material. By attaching the anchors 13e to the back side of the panel member 13, the anchors 13e can be projected into the space 56 filled with the curable material 14. As shown in FIG. The integration between the panel member 13 and the non-shrinkable mortar 14 with which the space 56 is filled can be enhanced by the anchor bars 13e. From the viewpoint of effectively enhancing the integrity of the panel member 13 and the non-shrinkable mortar 14 and from the viewpoint of preventing interference between the upper and lower panel members 13, 13, the L-shaped bent anchor line 13e is bent. It is preferable that the direction is along the extension direction X of the tunnel (see FIG. 9(b)).

Further, the space 56 to be filled with the curable material 14 is preferably internally provided with reinforcing bars (not shown) before the panel member 13 is attached to the panel mounting surface 11a of the support 11. can also By arranging the reinforcing bars inside the space 56 filled with the curable material 14, the strength of the formed reinforcing lining 58 can be effectively increased.

Furthermore, in this embodiment, as shown in FIG. 1, the existing tunnel lining body 55 having a curved cross-sectional shape protrudes from the lower part into the space 56 filled with the hardenable material 14 and is embedded in the hardenable material 14 . Preferably, a bottom anchor member 19 is attached. The lower anchor member 19 is made of, for example, a reinforcing rod having a thickness of about D19. Like 13e, it has an L-shaped bent shape. The lower anchor members 19 are preferably anchor bolts fixed by embedding their bases in the concrete portion of the existing tunnel lining 55, preferably of reinforced concrete or synthetic segments, as described above. are fixed to three locations on each of the side wall portions on both sides with the bending direction along the circumferential direction of the tunnel 50 . Since the lower anchor member 19 is provided to project from the lower part of the existing tunnel lining 55 into the space 56 filled with the hardening material 14, a large load including the self weight of the reinforcing lining 58 is provided. To effectively reinforce the interface between the lower part of the reinforcing lining 58 and the existing tunnel lining 55 where the becomes possible.

According to the reinforcement structure 10 for the existing tunnel of this embodiment, the panel members 13 arranged continuously in the circumferential direction at the portion sandwiched between the pair of adjacent support bodies 11 formed as described above. and the existing tunnel lining 55, by filling each of the one or more spaces 56 with preferably non-shrinkable mortar 14 as a hardening material, respectively, thereby restructuring the existing tunnel lining having a curved cross-sectional shape portion. A reinforcing lining body 58 can be formed to cover the inner peripheral surface of the construction body 55 .

That is, the curable material 14 is supplied to the space 56 for the panel member 13 ′ arranged at the top end portion of the upper part of the tunnel 50 among the plurality of panel members 13 arranged in series in the circumferential direction. For example, mortar supply pipes (not shown) are connected to these mortar supply holes 13d to supply the non-shrinkage mortar 14. Spaces 56 between panel members 13 and existing tunnel linings 55 can be filled with non-shrink mortar 14 respectively. When the filled non-shrinkage mortar 14 hardens and integrates with the panel member 13, the fixing bolt member 22 and the pressing fixing member 20, which fasten and fix the panel member 13 to the support body 11, are removed to remove the support. The reinforcing lining 58 covering the inner peripheral surface of the existing tunnel lining 55 is easily formed by integrating the body 11, the plurality of panel members 13, and the hardened non-shrinkable mortar 14. Become.

According to the reinforcement structure 10 with a drainage function for an existing tunnel of this embodiment, which has the above-described configuration, from the reinforcing lining body 58 formed on the inner surface of the tunnel lining body 55 by the segment 59 , especially the segment 59 It is possible to smoothly discharge exudate water exuding through the joint portion 60 between the front and rear of the housing with a simple configuration.

That is, according to the present embodiment, a pair of linear impermeable members 62 are provided on both sides of the joining portion 60 between the front and rear segments 59 extending in the circumferential direction in the spaced portion 61 so as to form a fixed surface portion of the support body 11 . 11b and the tunnel lining 55, the pair of linear impermeable members 62 are attached continuously in the circumferential direction from the upper end to the lower end of the support 11. The portion between them is used as a drainage channel 63 so that the exudate can be guided downward, and the lower end of the drainage channel 63 communicates with the inner space of the shield tunnel 50 to discharge the guided exudate. With such a simple configuration, it is possible to smoothly discharge exudate water that seeps through the joints 60 between the front and rear segments 59 from the reinforcing lining 58 . become.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are possible. For example, it is not always necessary to attach a pedestal plate member to the inner surface of the tunnel lining for fixing the support while holding the separation portion between the fixed surface portion of the support and the tunnel lining. For example, as shown in FIG. 11, when the support body 11' is H-shaped steel, a pair of nut members screwed onto anchor bolts 65 embedded so as to protrude from the inner surface of the ton lining body 55 by the segment 59. The support body 11' is fixed with the separating portion 61 held between the fixed surface portion 11b' and the tunnel lining 55 by a simpler method of simply sandwiching the fixed surface portion 11b' between the fixing surface portions 11b' and the tunnel lining body 55. You can also make

Moreover, the existing tunnel in which the tunnel lining is reinforced may be a mountain tunnel or various other tunnels other than the shield tunnel. The tunnel lining to be reinforced does not necessarily have to have an inner peripheral surface with a curved cross-sectional shape at least at the upper part, for example, if it is assembled by connecting segments in the axial direction of the tunnel. , a tunnel lining body having a rectangular cross-sectional shape. The supports need not necessarily be I-beams or H-beams, but may be various other steel members such as channel steels, angle steels, etc., which can provide panel mounting surfaces on the inside. . The panel member does not necessarily have to be made of fiber-reinforced concrete, and may be made of other materials such as synthetic resin, steel, and cast iron. The hardening material that fills the space between the panel member and the inner wall of the tunnel can be non-shrinking mortar, ordinary mortar, concrete, cement-based hardening materials such as cement milk, or non-cement-based hardening materials. It can be.

10 Reinforcement structure with drainage function 11 Support body (I-shaped steel)
11' support piece 11a panel mounting surface (inner flange)
11b Fixed surface (outer flange)
12 Pedestal plate member 12d Face plate portion 13 Panel member 14 Non-shrinking mortar (curing material)
15 Sandwich plate piece 50 Shield tunnel (existing tunnel)
51 Inner wall surface 55 Tunnel lining 56 Space 57 Inverted concrete portion 58 Reinforcement lining 59 Segment 60 Joining portion 61 Spacing portion 62 Linear impervious member (packer material)
63 Drainage channel 64 Water stopping adhesive X Tunnel extension direction Y Panel member connecting direction

Claims (5)

In an existing tunnel in which a tunnel lining body is formed by segments, it is provided when forming a reinforcing lining body on the inner surface of the tunnel lining body to drain water seeping from the joint between the front and rear segments. A reinforcement structure with a drainage function for an existing tunnel that enables drainage,
A plurality of supports mounted at predetermined intervals in the extension direction of the tunnel, each having a panel mounting surface on the inside and a fixing surface on the outside, and straddles the panel mounting surfaces of a pair of supports adjacent to each other in the front and rear direction. In this way, a plurality of panel members supported by the support and attached in series in the circumferential direction, and the space between the panel members and the tunnel lining is filled to form the support and comprising a curable material that integrates the panel member and the tunnel lining,
The support body is arranged such that the fixed surface portion covers a joint portion between the front and rear segments of the tunnel lining body, and a separation portion is provided between the fixed surface portion and the tunnel lining body. is fixed along the inner peripheral surface of the tunnel lining while holding the
A pair of linear impermeable members are placed in close contact with both the fixed surface portion and the tunnel lining on both sides of the joint portion extending in the circumferential direction in the spaced portion, and the support is It is mounted continuously in the circumferential direction from the upper end to the lower end,
The portion between the pair of linear impermeable members that are attached is used as a drainage channel to guide the seepage water downward, and the lower end of the drainage channel communicates with the internal space of the existing tunnel. A reinforced structure with a drainage function for the existing tunnel that is capable of discharging the seeped water that has been conveyed. A pedestal plate member is attached to the inner surface of the tunnel lining while maintaining a gap between it and the inner surface of the tunnel lining, and the fixed surface portion is fixed to the pedestal plate member. 2. The support according to claim 1, wherein the support is fixed along the inner peripheral surface of the tunnel lining while holding the separation portion between the fixed surface portion and the tunnel lining. Reinforcement structure with drainage function for existing tunnel. 3. The reinforcing structure with a drainage function for an existing tunnel according to claim 1 or 2, wherein the linear impermeable member comprises a impermeable packer. An existing tunnel with a drainage function according to any one of claims 1 to 3, wherein a waterproof adhesive is applied along the side surface of the linear waterproof member opposite to the drainage channel. reinforced structure. The existing structure according to any one of claims 1 to 4, wherein the support is made of I-shaped steel or H-shaped steel, the inner flange is the panel mounting surface portion, and the outer flange is the fixing surface portion. Reinforcement structure with tunnel drainage function.

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