JP2013204298A - Method for reinforcing inner lining of tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reinforcing an inner lining of a tunnel capable of supporting a reinforcement member on the inner peripheral surface of an existing tunnel without impairing the water barrier effect by a water-impervious sheet.SOLUTION: A method for reinforcing an inner lining of a tunnel includes the steps of: mounting a water-impervious sheet 3 on an inner peripheral surface 2a of an existing tunnel 2; supporting a reinforcement member 4 on the inner peripheral surface 2a of the existing tunnel 2 so that the reinforcement members 4 are installed along the inner peripheral surface 2a of the existing tunnel on the inside of the existing tunnel 2; installing a form device 6 on the inside of the reinforcement members 4; and backfilling between the form device 6 and the water-impervious sheet 3 with a filler 7. The reinforcement member 4 is supported on the inner peripheral surface 2a of the existing tunnel 2 by pressing a support part 50 of a reinforcement member supporting device 5 for supporting the reinforcement member 4 on the inner peripheral surface 2a of the existing tunnel 2 against the inner peripheral surface 2a of the existing tunnel 2 via the water-impervious sheet 3.

Description

  The present invention relates to a tunnel inner winding reinforcing method for renewing an existing tunnel.

  As a method of renewing an existing tunnel whose function has deteriorated due to deterioration, cracking, erosion, etc. of concrete, a plurality of ring-shaped reinforcing members are arranged at predetermined intervals along the extension direction of the tunnel in the existing tunnel. A surface member is attached to the inner peripheral surface side of the ring of the reinforcing member to form a cylinder smaller in diameter than the existing tunnel inside the existing tunnel, and between the outer peripheral surface of this cylindrical body and the inner peripheral surface of the existing tunnel A tunnel inner winding reinforcement method is known in which an existing tunnel is repaired from the inside by injecting a filler into the tunnel. In this case, before assembling the reinforcing member, the inner peripheral surface of the existing tunnel is covered with a water-impervious sheet to prevent the filler from escaping outside the existing tunnel. Is prevented from deteriorating.

Japanese Patent Laid-Open No. 2001-311387 (see claims, paragraph 0061, etc.)

Conventionally, in order to fix the reinforcing member to the natural ground around the existing tunnel, the anchor for anchoring was driven into the natural ground from the inside of the existing tunnel. There was a problem that the water shielding effect was impaired.
The present invention provides a tunnel inner winding reinforcement method capable of supporting a reinforcing member on the inner peripheral surface of an existing tunnel without impairing the water shielding effect of the water shielding sheet.

The tunnel inner winding reinforcing method according to the present invention includes a step of attaching a water shielding sheet to the inner peripheral surface of an existing tunnel, and a reinforcing member so that the reinforcing member is installed inside the existing tunnel along the inner peripheral surface of the existing tunnel. Tunnel inner winding reinforcement comprising a step of supporting the inner peripheral surface of an existing tunnel, a step of installing a formwork inside the reinforcing member, and a step of filling a filler between the formwork and the water shielding sheet. In the method, the reinforcing member is pressed against the inner peripheral surface of the existing tunnel by pressing the supporting portion of the reinforcing member supporting device that supports the reinforcing member on the inner peripheral surface of the existing tunnel through the water shielding sheet to the inner peripheral surface of the existing tunnel. Since it was supported, the reinforcing member can be supported on the inner peripheral surface of the existing tunnel without impairing the water shielding effect of the water shielding sheet.
The reinforcing member supporting device includes a moving body provided with a supporting portion, and a moving body mounting device that attaches the moving body to the reinforcing member so that the supporting portion can move in a direction approaching the seat inner surface of the water-impervious sheet and a direction away from the inner surface of the sheet. Therefore, the work of supporting the reinforcing member on the inner peripheral surface of the existing tunnel can be easily and reliably performed without impairing the water shielding effect of the water shielding sheet.
The support portion has a surface that contacts the inner surface of the existing tunnel by contacting the inner surface of the existing tunnel by contacting the inner surface of the existing tunnel by contacting the inner surface of the existing tunnel. By pressing against the circumferential surface, damage to the water shielding sheet due to contact between the support portion and the water shielding sheet can be suppressed, and the reinforcing member can be attached to the inner circumferential surface of the existing tunnel without impairing the water shielding effect of the water shielding sheet. Can be supported.

Sectional drawing of a tunnel inner volume reinforcement structure. The principal part expanded sectional view of the tunnel inner volume reinforcement structure. The perspective view which shows the use condition of a connection member and a reinforcement member support apparatus. The disassembled perspective view which shows a reinforcement member support apparatus. The enlarged view which shows steel rings. The perspective view which shows a surface member. The perspective view which shows a fitting member. The process drawing of the tunnel inner volume reinforcement method. The process drawing of the tunnel inner volume reinforcement method.

  As shown in FIG. 1, the tunnel inner winding reinforcement structure 1 was installed on the inner side of the inner peripheral surface 2 a of the existing tunnel 2 formed in the natural ground 100, and on the inner side of the water shielding sheet 3. A reinforcing member 4, a reinforcing member support device 5 for supporting the reinforcing member 4 on the inner peripheral surface 2 a of the existing tunnel 2 via the water shielding sheet 3, and the existing tunnel 2 attached to the reinforcing member 4 and inside the existing tunnel 2. A mold apparatus 6 that forms a cylinder having a diameter smaller than the diameter of the tunnel cavity, and a filler 7 filled between the mold apparatus 6 and the water shielding sheet 3.

As the water shielding sheet 3, for example, a sheet made of ethylene vinyl acetate was used.
The reinforcing member 4 includes, for example, a plurality of steel rings 40 arranged at predetermined intervals along the extending direction of the tunnel 2 and a steel ring arranged so as to be adjacent to each other along the extending direction of the tunnel 2. It is a cylindrical skeleton reinforcement body comprised by the connection member 8 which connects 40 and the steel rings 40 (refer FIG.8 (c)).
The steel ring 40 includes an outer peripheral surface 41 and an inner peripheral surface 42 which are positioned so as to face the inner peripheral surface 2a of the existing tunnel 2 in a tunnel cross section orthogonal to the tunnel extension direction of the existing tunnel 2 with a predetermined interval. The ring provided (see FIG. 5), for example, the ring axis more than the length dimension in the ring radial direction (direction perpendicular to the center axis of the ring) between the outer peripheral surface 41 and the inner peripheral surface 42 of the ring The thickness dimension (thickness dimension of the steel plate) in the direction (direction parallel to the center axis of the ring) is smaller (see FIG. 8B).
The steel ring 40 is formed, for example, in a ring shape along the inner peripheral surface 2a of the existing tunnel 2 by combining a plurality of arc-shaped segment pieces in a shape obtained by disassembling the ring.

As shown in FIG. 5, on the inner peripheral surface 42 of the steel ring 40, fitting concave portions 45 into which fitting members 60 described later are fitted are formed at equal intervals in the circumferential direction, and the steel ring 40 A through hole 47 that penetrates the plate in the thickness direction is formed in the plate portion 46 between the fitting recess 45 and the fitting recess 45 adjacent to each other in the circumferential direction.
The fitting recess 45 is a recess provided with an opening 48 that opens to the inner peripheral surface 42 of the steel ring 40, and has a configuration in which a surface that continues to the opening edge of the opening 48 is formed on the locking surface 49.
As an example, the fitting recess 45 has a width in the ring circumferential direction (a direction along the circumference of the ring) in the intermediate portion in the depth direction (ring radial direction) of the recess, and the ring circumferential direction in the opening 48 of the recess. In other words, the opposite corners of a square such as a rhombus are parallel to each other, and one of the parallel parts forms a recess bottom surface 45a, and the other parallel part opens. A concave portion having a shape in which an inclined surface that is formed on the locking surface 49 is formed on the locking surface 49.

As shown in FIG. 3; FIG. 8C, the connecting member 8 is disposed between the steel ring 40 and the steel ring 40, which are disposed adjacent to each other along the extending direction of the tunnel 2, for example. A pipe member 81 serving as a spacer, a bolt 83 having screw portions formed at both ends, and nuts 82; 82 fastened to the screw portions. Bolts 83 are inserted into the pipe material 81, and screw portions at both ends of the bolt 83 are respectively inserted into the through holes 47 of the steel rings 40 positioned at both ends of the pipe material 81. By fastening the nut 82; 82 to the threaded portion of the steel ring 40, the steel ring 40 and the steel ring 40 arranged so as to be adjacent to each other along the extending direction of the tunnel 2 are connected by the connecting member 8, and the reinforcing member A cylindrical skeleton reinforcing body as 4 is configured.
In addition, you may use the connection member 8 provided with the volt | bolt 83 in which the thread part was formed over the full length, and the nut 82; When the all-screw type bolt 83 is used, the distance (pitch) between the steel ring 40 and the steel ring 40 is set in accordance with the delicate curve alignment of the inner peripheral surface 2a of the existing tunnel 2 in the tunnel extending direction. There is an effect that fine adjustment is possible.

  As shown in FIG. 3 and FIG. 4, the reinforcing member support device 5 is a device for supporting the steel ring 40 constituting the reinforcing member 4 on the inner peripheral surface 2 a of the existing tunnel 2, for example. A movable body 51 provided with a support portion 50 that comes into contact with the inner surface 31 of the water-impervious sheet 3 attached to the inner peripheral surface 2a of the inner wall 2 from the inner side of the existing tunnel 2 (tunnel cavity), and the movable body 51 can be moved. And a moving body attaching device 52 attached to the steel ring 40.

The moving body 51 includes an attachment shaft 54 having a threaded portion 53 formed at least on one end side, and a support portion 50 attached to the other end of the attachment shaft 54.
What is necessary is just to use the support part 50 provided with the contact part 50A formed by the surface which contacts the sheet | seat inner surface 31 of the water-impervious sheet 3 and presses the water-impervious sheet 3 against the inner peripheral surface 2a of the existing tunnel 2. For example, the support part 50 shaped like a pan lid having a contact part 50A formed by an annular surface as shown in FIG.
The contact portion 50 </ b> A that contacts the inner surface 31 of the water-impervious sheet 3 and presses the impermeable sheet 3 against the inner peripheral surface 2 a of the existing tunnel 2 in the support unit 50 is configured to make point contact or line contact with the inner surface 31 of the sheet. However, in order to increase the effect of suppressing damage to the water-impervious sheet 3, it is preferable that the sheet inner surface 31 is in surface contact as described above. For example, a contact portion such as a spherical surface that contacts the inner surface 31 of the water-impervious sheet 3 and presses the impermeable sheet 3 against the inner peripheral surface 2 a of the existing tunnel 2, a curvature surface corresponding to the curvature of the inner surface 31 of the water-impervious sheet 3, etc. It is preferable to use the support part 50 provided with the surface as 50A.

The moving body mounting device 52 includes a connecting plate 55 and bolts and nuts as fixtures.
The connecting plate 55 includes a ring mounting surface 56 and a shaft mounting surface 57. The ring mounting surface 56 includes a through hole 59 that is in communication with the through hole 47 of the steel ring 40 and into which a bolt 58 is inserted. The surface 57 includes a through hole 68 through which the mounting shaft 54 is inserted.
One nut 65 is attached in advance to the threaded portion 53 of the mounting shaft 54, and after passing the mounting shaft 54 from one end side of the mounting shaft 54 to the through hole 68 of the shaft mounting surface 57, the other nut is connected to the threaded portion 53 of the mounting shaft 54. The mounting shaft 54 is fixed to the shaft mounting surface 57 by fastening a pair of nuts 65; 66 so that the shaft mounting surface 57 is sandwiched therebetween. Further, by aligning the through hole 59 of the ring mounting surface 56 with the through hole 47 of the steel ring 40, the bolt 58 is inserted into the through hole 59; 47, and the nut 67 is fastened to the threaded portion of the bolt 58. The ring attachment surface 56 is attached to the steel ring 40.

  According to the moving body mounting apparatus 52 having the above configuration, the moving body 51 can be moved by moving the mounting shaft 54 by loosening the pair of nuts 65; That is, the mounting shaft 54 is attached to the steel ring 40 via the moving body mounting device 52 so that the contact portion 50A of the support portion 50 of the moving body 51 can move in a direction approaching the seat inner surface 31 and a direction away from the seat inner surface 31. Since it is attached, the work of supporting the reinforcing member 4 on the inner peripheral surface 2a of the existing tunnel 2 can be performed easily and reliably without impairing the water shielding effect of the water shielding sheet 3.

As shown in FIG. 1; FIG. 9B, the formwork device 6 includes a fitting member 60 fitted into the fitting recess 45 from a direction orthogonal to the plate surface of the steel plate of the steel ring 40, and the fitting recess 45. And a surface member 61 attached to the fitting member 60 from the end side in the extending direction of the fitting member 60 with respect to the fitting member 60 fitted into the fitting member 60.
As shown in FIG. 7, the fitting member 60 is formed by a long member whose cross-sectional shape orthogonal to the longitudinal direction is formed in a shape corresponding to the shape of the fitting recess 45.
As shown in FIG. 6, the surface member 61 is a long plate that forms a part of the circumferential surface of the cylindrical body 70 (see FIG. 1) constructed inside the existing tunnel 2, and is formed in the short direction. A pair of rising pieces 63 provided so as to extend in substantially the same direction at both ends in the short direction of the substrate 62; 63 and a pair of engaging pieces 64; 64 provided so as to extend toward the substrate 62 from the tip of each rising piece 63; 63.
The surface member 61 has a pair of engaging pieces 64; 64 inside the two adjacent fitting members 60; 60 fitted in the fitting recesses 45; 45 that are adjacent to each other in the circumferential direction of the steel ring 40. They are attached to engage with each other (see FIG. 2).
As shown in FIG. 1, a plurality of surface members 61 are attached along the inner peripheral surface 42 of the steel ring 40 to form a cylindrical body 70 as a cylindrical body having a smaller diameter than the diameter of the tunnel cavity portion. The substrate of the member 61 forms the circumferential surface 71 of the cylindrical body 70, and the rising piece 63 of each surface member 61 extends in the radial direction of the cylindrical body 70.

  As the filler 7, for example, mortar excellent in fluidity, water separation resistance, no shrinkage, and non-breathing property was used.

Next, a tunnel inner winding reinforcing method will be described.
The tunnel inner winding reinforcement method includes a water shielding sheet installation work, a pipe making work, and a backfill filling work.
The pipe making machine includes a cylindrical skeleton reinforcing body construction work and a cylindrical body construction work.
First, in the water shielding sheet installation work, the water shielding sheet 3 is bonded to the inner peripheral surface (covering surface) 2 a of the existing tunnel 2 to form a cylinder of the water shielding sheet 3 that extends in the extending direction of the existing tunnel 2. In addition, the edge part of the cylinder of the water-impervious sheet 3 and the edge part of the extension direction of the cylinder of the water-impervious sheet 3 arranged along the extension direction of the existing tunnel 2 and adjacent to each other are welded, for example. It joined by.
In the tubular skeleton reinforcing body construction work of pipe making, a plurality of pieces are provided in the tunnel cavity that is inside the existing tunnel 2 surrounded by the water-impervious sheet 3 at predetermined intervals along the extending direction of the tunnel cavity. The steel rings 40 are installed, and each steel ring 40 is supported on the inner peripheral surface 2 a of the existing tunnel 2 using the reinforcing member support device 5. For example, three or more reinforcing member support devices 5 are attached to the steel ring 40 at equal intervals along the circumferential direction of the steel ring 40, and the contact portion 50 </ b> A of the support portion 50 is brought into contact with the sheet inner surface 31 of the water shielding sheet 3. In this state, the steel ring 40 is supported on the inner peripheral surface 2 a of the existing tunnel 2 by pressing against the inner peripheral surface 2 a of the existing tunnel 2. Further, the steel ring 40 and the steel ring 40 arranged so as to be adjacent to each other along the extending direction of the tunnel 2 are connected by the connecting member 8 to construct a cylindrical skeleton reinforcing body.
In the cylindrical body construction work of the pipe making, the fitting member 60 is fitted and attached to the fitting recess 45 of each steel ring 40 constituting the cylindrical skeleton reinforcing body. And the cylindrical body 70 is constructed | assembled by attaching the surface member 61 to the fitting member 60 attached to the inner peripheral side of the steel rings 40. The fitting member 60 and the surface member 61 that form the outer peripheral surface of the cylindrical body 70 function as a mold.
In the backfilling work, a filler filling port 73 is formed in the substrate 62 of the surface member 61, and a filler feed pipe 74 is connected to the filler filling port 73, so that the mold device 6 and the water shielding sheet 3 are connected. Is filled with a filler 7 (see FIG. 9C). After the backfilling process is completed, the filler filling port 73 is closed.
As described above, the inside of the existing tunnel 2 is reinforced by the tunnel inner winding reinforcement structure 1 and the existing tunnel 2 is renewed.

  According to the tunnel inner winding reinforcing method of the embodiment, the contact portion 50A of the support portion 50 is brought into contact with the inner surface 31 of the water-impervious sheet 3 and pressed against the inner peripheral surface 2a of the existing tunnel 2, so It becomes possible to prevent damage to the water-impervious sheet due to contact with the sheet 3, and to support the reinforcing member 4 on the inner peripheral surface 2 a of the existing tunnel 2 without impairing the water-impervious effect of the water-impervious sheet 3. it can.

  The present invention is applicable to a tunnel including a pipe that forms an upper waterway, a lower waterway, an inter-dam waterway, an agricultural waterway, and the like.

1 tunnel inner winding reinforcement structure, 2 existing tunnel, 2a inner surface of existing tunnel,
3 water shielding sheet, 4 reinforcing member, 5 reinforcing member support device, 6 formwork device, 7 filler,
31 Sheet inner surface, 50 support part, 50A contact part.

Claims (3)

Attaching the water shielding sheet to the inner peripheral surface of the existing tunnel, and supporting the reinforcing member on the inner peripheral surface of the existing tunnel so that the reinforcing member is installed along the inner peripheral surface of the existing tunnel inside the existing tunnel; In the tunnel inner winding reinforcement method comprising the steps of installing the mold inside the reinforcing member, and filling the filler between the mold and the water shielding sheet,
The reinforcing member is supported on the inner peripheral surface of the existing tunnel by pressing the support portion of the reinforcing member supporting device that supports the reinforcing member on the inner peripheral surface of the existing tunnel, against the inner peripheral surface of the existing tunnel through the water shielding sheet. A tunnel inner winding reinforcement method characterized by the above.   The reinforcing member supporting device includes a moving body provided with a supporting portion, and a moving body mounting device that attaches the moving body to the reinforcing member so that the supporting portion can move in a direction approaching the seat inner surface of the water-impervious sheet and a direction away from the inner surface of the sheet. The tunnel inner winding reinforcement method according to claim 1, comprising: The tunnel inner winding reinforcement method according to claim 1 or 2, wherein the support portion includes a surface that contacts the inner surface of the water-impervious sheet and presses the water-impervious sheet against the inner peripheral surface of the existing tunnel. .

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