JP5603291B2 - Tunnel lining reinforcement structure and tunnel lining reinforcement method - Google Patents

Description

  The present invention relates to a tunnel lining reinforcing structure and a tunnel lining reinforcing method.

  When reinforcing an existing tunnel lining, there was a method of assembling a pillar in the tunnel lining and applying axial force to the lining by a jack, but there was a problem that the use of the empty section in the tunnel was greatly limited there were. Therefore, a reinforcing structure as shown in Patent Document 1 has been proposed. The reinforcement described in Patent Document 1 is constructed by arranging a reinforcement segment inside the lining, fixing the reinforcement segment to the back ground with a lock bolt, and then repeating the process of grouting the back surface of the reinforcement segment. The

JP 2001-323792 A

  However, in the reinforcement structure of Patent Document 1, since mortar is only injected into the back surface of the reinforcement segment, the existing lining is not positively expanded and reinforced, and is caused in the existing lining by the current external load. The cross-sectional force that is present cannot be reduced.

  From such a viewpoint, an object of the present invention is to provide a tunnel lining reinforcing structure and a tunnel lining reinforcing method capable of reducing a cross-sectional force generated in an existing lining by an external load.

  The invention according to claim 1 for solving such a problem, in a tunnel lining reinforcing structure for reinforcing a tunnel lining, a ring member disposed along an inner surface of the tunnel lining, An expansion material filled between a tunnel lining and the ring member is provided, and an arrangement space for the expansion material is defined by the ring member and an inner surface of the tunnel lining. Tunnel lining reinforcement structure.

  According to the tunnel lining reinforcing structure according to the present invention, the expansion material tries to expand while pressing the existing tunnel lining and the ring member, but the ring member can counter the inward expansion force of the expansion material. it can. Accordingly, the expansion force of the expansion material acts outwardly on the inner surface of the tunnel lining, and the axial force applied in the circumferential direction of the existing tunnel lining is reduced. Thereby, the cross-sectional force generated in the existing tunnel lining by the external load can be reduced.

  According to a second aspect of the present invention, the ring member includes a plurality of pieces divided in the circumferential direction, and a connecting portion between the adjacent pieces is pressed from the radially inner side to the piece. A fixing member for fixing each other is provided.

  According to such a configuration, the installation work of the ring member can be easily performed, and the resistance effect of the ring member on the expansion material can be secured by the fixing member.

  In the invention according to claim 3, a concave groove extending in the circumferential direction is formed on the outer peripheral surface of the piece, and the arrangement space is defined by the concave groove and the inner surface of the tunnel lining. It is characterized by.

  According to such a configuration, since the expansion of the expansion material is suppressed by the bottom surface and the side wall surface of the concave groove, the expansion force of the expansion material acts on the inner surface of the tunnel lining to concentrate outward. Thus, more efficient reinforcement can be performed.

  The invention according to claim 4 is characterized in that an expansion pressure-resistant tube is disposed in the arrangement space, and the expansion material is filled in the pressure-resistant tube.

  According to such a configuration, the expansion material can be easily filled in the arrangement space without leakage.

  The invention according to claim 5 is a tunnel lining reinforcing method for reinforcing a tunnel lining, wherein a pressure-resistant tube laying step of laying a pressure-resistant tube in an annular shape along an inner surface of the tunnel lining, A tunnel lining reinforcing method comprising: a ring member forming step of forming a ring member so as to cover from the inside of the tunnel; and an expansion material filling step of filling the pressure resistant tube with an expansion material.

  According to the tunnel lining reinforcing method of the present invention, the expansion material tries to expand while pressing the existing tunnel lining and the ring member, but the ring member can counter the inward expansion force of the expansion material. it can. Accordingly, the expansion force of the expansion material acts outwardly on the inner surface of the tunnel lining, and the axial force applied in the circumferential direction of the existing tunnel lining is reduced. Thereby, the cross-sectional force generated in the existing tunnel lining by the external load can be reduced.

  According to the tunnel lining reinforcing structure and the tunnel lining reinforcing method of the present invention, the cross-sectional force generated in the existing lining due to the external load can be reduced.

It is a figure for demonstrating the construction process of the tunnel lining reinforcement structure which concerns on embodiment of this invention, Comprising: It is sectional drawing which showed the state which laid the pressure | voltage resistant tube in the tunnel lining. It is a figure for demonstrating the construction process of the tunnel lining reinforcement structure which concerns on embodiment of this invention, Comprising: It is sectional drawing which showed the state which installed the piece and the fixing member in the tunnel lining. It is the figure which cut | disconnected the tunnel lining reinforcement structure of FIG. 2 along the thickness direction of tunnel lining, (a) is sectional drawing of the part which installed the piece, (b) installed a piece and a fixing member It is sectional drawing of the part which carried out. It is sectional drawing which showed the tunnel lining reinforcement structure which concerns on embodiment of this invention. It is the figure which cut | disconnected the tunnel lining reinforcement structure of FIG. 4 along the thickness direction of tunnel lining, (a) is sectional drawing of the part which installed the piece, (b) installed a piece and a fixing member It is sectional drawing of the part which carried out.

  A tunnel lining reinforcement structure according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. As shown in FIG. 4, the tunnel lining reinforcing structure 1 is a structure for reinforcing an existing tunnel lining 2 in service from the inside. The tunnel lining reinforcing structure 1 includes a ring member 20 disposed along the inner surface of the tunnel lining 2, and an expansion material 10 (see FIG. 5) filled between the tunnel lining 2 and the ring member 20. It has. Although illustration is omitted, the tunnel lining reinforcing structure 1 is formed at a predetermined pitch along the axial direction of the tunnel.

  In the present embodiment, the expandable material 10 is hardened and expandable cement milk, and is press-fitted into a pressure-resistant tube 12 disposed in a space 11 where the expandable material 10 is disposed, as shown in FIG. Cement milk is formed by adding water to a mixture of cement, an expansion material (for example, lime-based expansion material) and gypsum, and expands when cured. The material of the cement milk is not limited to the above. The pressure-resistant tube 12 can expand following the expansion of the cement milk and has a strength capable of resisting the expansion pressure. The pressure-resistant tube 12 is formed in an annular shape (endless shape), and a space filled with cement milk is formed therein.

  As shown in FIG. 1, the pressure-resistant tube 12 is bonded to the inner surface 2 a of the tunnel lining 2. The pressure-resistant tube 12 is provided with a cement milk injection pipe 12a and an air vent pipe 12b in the vicinity of each other. The injection pipe 12 a and the air vent pipe 12 b are located on the upper side of the tunnel lining 2.

  As shown in FIGS. 4 and 5, the ring member 20 is a member that suppresses the pressure-resistant tube 12 into which the expansion material 10 has been injected from attempting to expand inward. The ring member 20 is arranged inside the pressure-resistant tube 12 in the tunnel radial direction. The ring member 20 and the inner surface 2a of the tunnel lining 2 define an arrangement space 11 for the expansion material 10, and the pressure-resistant tube 12 is arranged in the arrangement space 11 (see FIG. 5).

  As shown in FIG. 4, the ring member 20 includes a plurality of pieces 21, 21... Divided in the circumferential direction, and fixing members 30, 30.・ It is equipped with. The piece 21 is made of a precast member made of steel or reinforced concrete. The adjacent pieces 21 and 21 are fixed to each other by welding or adhesion. In this embodiment, the piece 21 is formed, for example, by dividing the entire circumference into eight equal parts, and has an arc shape having a central angle of 45 degrees and a constant thickness in the radial direction. The outer peripheral surface of the piece 21 has the same curvature as that of the inner surface of the tunnel lining 2 so that the curved surfaces can come into surface contact. Note that the central angle of the piece 21 is not limited to 45 degrees, and is appropriately set according to the tunnel diameter and the material of the piece 21.

  As shown to (a) of FIG. 3, the groove | channel 22 extended in the circumferential direction is formed in the outer peripheral surface of the piece 21, and the cross-sectional concave shape is exhibited. The concave groove 22 is formed over the entire length of the piece 21, and is connected in an annular shape along the inner surface of the tunnel lining 2 in a state where the pieces 21, 21,... Are combined (see FIG. 4). The bottom surface 22 a and the side wall surfaces 22 b and 22 b of the concave groove 22 and the inner surface 2 a of the tunnel covering 2 facing the concave groove 22 serve as the inner peripheral wall of the arrangement space 11. The piece 21 is installed so as to cover the pressure tube 12. Here, the outer peripheral surfaces 21a and 21a located on both sides in the width direction of the opening end of the concave groove 22 are in contact with the inner surface of the tunnel lining 2 (see FIG. 3A). The concave groove 22 has a larger cross-sectional shape than the cross section of the pressure-resistant tube 12 before expansion, and a gap is formed between the bottom surface 22 a and the side wall surfaces 22 b and 22 b and the pressure-resistant tube 12.

  As shown in FIG. 5, mortar 23 is filled in the gap. An injection opening (not shown) is formed in the uppermost piece 21, and the mortar 23 is injected into the concave groove 22 from the injection opening. By injecting the mortar 23 into the concave groove 22 in this way, a sufficient pressing force can be efficiently ensured with a small amount of the expansion material 10. Moreover, since the deformation | transformation range of the pressure | voltage resistant tube 12 can be made small, the durability can be improved. Sealing material 25 is laid in the corners of the contact portions with the inner surface 2a of the tunnel lining 2 on both sides in the width direction of the piece 21 to improve the sealing performance of the mortar 23 (see FIG. 5). (See (a)).

  As shown in FIG. 3B, a connecting member between the adjacent pieces 21 and 21 is provided with a fixing member 30 that fixes the pieces 21 and 21 by pressing the connecting portion from the inside in the radial direction of the tunnel. ing. The fixing member 30 is formed in a concave cross section having an inner peripheral shape along the outer peripheral shape of the inner surface of the piece 21. The fixing member 30 covers a connection portion between the adjacent pieces 21 and 21 within a predetermined length in the circumferential direction. That is, the fixing member 30 is disposed so as to straddle the connecting portions of the adjacent pieces 21 and 21 and covers the end portions of the pieces 21 and 21 from the inner side in the tunnel radial direction. The fixing member 30 is fixed to each piece 21, 21. This ensures the roundness of the ring member 20 (see FIG. 4). Sealing material 25 is laid in the corners of the abutting portions with the inner surface 2a of the tunnel lining 2 on both sides of the fixing member 30 in the width direction. (See (b) of FIG. 5).

  Next, the construction process (tunnel lining reinforcement method) of the tunnel lining reinforcement structure 1 having the above-described configuration and the effects thereof will be described. When constructing the tunnel lining reinforcement structure 1, as shown in FIG. 1, first, the pressure tube 12 is laid in an annular shape along the inner surface 2a of the tunnel lining 2 (pressure tube laying step). The pressure tube 12 is attached to the inner surface 2a with an adhesive. At this time, the injection pipe 12 a and the air vent pipe 12 b are positioned on the upper side of the tunnel lining 2.

  After that, as shown in FIG. 2, the pieces 21 are sequentially assembled from the lower side so as to cover the pressure-resistant tube 12, the pieces 21 and 21 are joined together, and then the fixing member 30 is put on the joined portions of the pieces 21 and 21. , Fixed to each piece 21, 21. At this time, the outer peripheral surface 21 a of the piece 21 is in contact with the inner surface 2 a of the tunnel lining 2, and the bottom surface 22 a and the side wall surface 22 b of the groove 22 and the inner surface 2 a of the tunnel lining 2 The arrangement space 11 is partitioned (see FIG. 3A). Then, a nut is fastened to an anchor bolt (not shown), and the fixing member 30 is temporarily fixed to the inner surface 2 a side of the tunnel lining 2.

  As shown in FIG. 4, if all the pieces 21 are installed over the entire inner periphery of the tunnel lining 2 and all the fixing members 30 are installed, the formation of the ring member 20 is completed (ring member forming step). .

  Thereafter, a sealing material 25 (see FIG. 5A) is provided at the corner of the contact portion between the piece 21 and the inner surface 2a of the tunnel lining 2 (sealing step). In the portion where the fixing member 30 is provided, a sealing material 25 is provided at the corner of the contact portion between the fixing member 30 and the inner surface 2a of the tunnel lining 2 so as to surround the fixing member 30 (see FIG. 5). (See (b)).

  Next, the mortar 23 is injected into the arrangement space 11 from an injection opening (not shown) formed in the piece 21 and the space around the pressure-resistant tube 12 in the concave groove 22 is filled (mortar filling step). ).

  Thereafter, the expansion material 10 is filled into the pressure-resistant tube 12 from the injection tube 12a (expansion material filling step). At this time, it is confirmed that the entire pressure-resistant tube 12 is filled by visually confirming the outflow of the expansion material 10 from the air vent pipe 12b. After confirming the filling, the air vent pipe 12b is closed, and the expansion material 10 is further filled, and the pressure in the pressure-resistant tube 12 is increased to a predetermined pressure and cured at a high pressure. And after hardening of the expansion | swelling material 10 is completed and the tunnel lining reinforcement structure 1 is completed, temporary fixation of the fixing member 30 to the inner surface 2a side of the tunnel lining 2 is cancelled | released.

  According to the tunnel lining reinforcing structure 1 and the tunnel lining reinforcing method configured as described above, the expansion material 10 is cured while pressing the tunnel lining 2 and the ring member 20. Since the pressing force in the direction is converted into a circumferential force, the ring member 20 can counter the inward expansion force of the expansion material 10. Accordingly, the expansion force of the expansion material 10 acts outwardly on the inner surface 2a of the existing tunnel lining 2 to push the tunnel lining 2 apart. Thereby, since the axial force applied to the circumferential direction of the existing tunnel lining 2 is reduced, the cross-sectional force generated in the existing tunnel lining 2 by an external load can be reduced. Further, here, a concave groove 22 extending in the circumferential direction is formed on the outer peripheral surface of the piece 21, and the arrangement space 11 is partitioned by the concave groove 22 and the inner surface 2 a of the tunnel lining 2. Therefore, since the expansion of the expansion material 10 is suppressed by the bottom surface 22a and the side wall surface 22b of the concave groove 22, the expansion force of the expansion material 10 acts on the inner surface 2a of the tunnel lining to concentrate outward. Become. Thereby, the force which pushes the tunnel lining 2 outward (pushing out) can be further increased, and the cross-sectional force generated in the existing tunnel lining 2 by an external load can be further reduced.

  In addition, by adopting a circular ring member 20 over the entire inner circumference of the tunnel lining 2, the ring member 20 is structurally stable and converts the expansion force of the expansion material 10 into a circumferential force. Can be supported. As a result, the ring member 20 can efficiently support the reaction force with a small cross section, and hence the amount of protrusion into the tunnel can be reduced. Therefore, it is possible to suppress the reduction of the inner cross section (tunnel volume) of the tunnel to the minimum necessary (only the cross sections of the ring member 20 and the fixing member 30 along the inner peripheral surface of the tunnel lining 2).

  Since the ring member 20 includes a plurality of pieces 21 that are divided in the circumferential direction, installation in the tunnel is facilitated. And since the fixing member 30 which presses and fixes the connection part from radial inside is provided in the connection part of adjacent pieces 21 and 21, the ring member 20 can be integrated and the expansion material 10 can be integrated. The resistance effect can be further increased.

  Furthermore, since the mortar 23 is filled around the pressure tube 12, the expansion material 10 can be easily filled into the arrangement space 11 without leakage. Moreover, since the pressure | voltage resistant tube 12 tracks and adhere | attaches the inner surface 2a of the tunnel lining 2, the unevenness | corrugation error of the inner peripheral surface of the tunnel lining 2 can be absorbed.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to the said embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably. For example, in the tunnel lining reinforcement structure 1 according to the embodiment, the ring member 20 is configured by combining the pieces 21 that are precast members. However, the concrete is cast in place so that the pressure-resistant tube 12 is wound, and the ring member is May be built. In this case, if a tensile steel material is arranged in the ring member, a reinforcing effect due to the load resistance of the ring member itself can be added.

  Moreover, in the said embodiment, although the pressure | voltage resistant tube 12 is formed in one system | strain with the filling space communicating over the perimeter, it is not limited to this. For example, when the tunnel diameter is large and the hydraulic pressure difference due to the difference in cement milk density between the heights is large enough to affect the reinforcing effect, the pressure-resistant tube may be divided in the circumferential direction. And the hydraulic pressure difference of an expansion material is made small by changing suitably the filling pressure of an expansion material for every pressure | voltage resistant tube. Thereby, a uniform reinforcing effect can be obtained over the entire circumference of the tunnel lining 2.

  Furthermore, in the said embodiment, although the expansion material 10 was filled in the pressure | voltage resistant tube 12, it is not limited to this. Instead of the expansion material 10, a water expansion seal (for example, Policyler 1000W-TO (vulcanized rubber-based water expansion seal) manufactured by Three Bond Unicom Co., Ltd.) is attached to the inner surface of the tunnel lining and hydrated. Good. In this case, each piece is attached and fixed with a fixing member so as to cover the water expansion seal, thereby forming a ring member. Thereafter, water is injected between the groove of the ring member and the inner surface of the tunnel lining to expand the water expansion seal. Accordingly, the water expansion seal spreads the tunnel lining, and the same effect as that of the above embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Tunnel lining reinforcement structure 2 Tunnel lining 2a Inner surface 10 Expansion material 11 Arrangement | positioning space 12 Pressure | voltage resistant tube 20 Ring member 21 Piece 22 Concave groove 30 Fixing member

Claims (5)

In tunnel lining reinforcement structure for reinforcing tunnel lining,
A ring member disposed along the inner surface of the tunnel lining, and an expansion material filled between the tunnel lining and the ring member,
The tunnel lining reinforcing structure, wherein the ring member and the inner surface of the tunnel lining define an arrangement space for the expansion material. The ring member comprises a plurality of pieces divided in the circumferential direction,
The tunnel lining reinforcement structure according to claim 1, wherein a connecting member between adjacent pieces is provided with a fixing member that presses the connecting portion from the radially inner side to fix the pieces together. . A concave groove extending in the circumferential direction is formed on the outer peripheral surface of the piece,
The tunnel lining reinforcement structure according to claim 2, wherein the arrangement space is defined by the concave groove and an inner surface of the tunnel lining. In the arrangement space, an inflatable pressure-resistant tube is arranged,
The tunnel lining reinforcement structure according to any one of claims 1 to 3, wherein the expansion material is filled in the pressure-resistant tube. In the tunnel lining reinforcement method for reinforcing the tunnel lining,
A pressure-resistant tube laying step of laying a pressure-resistant tube in an annular shape along the inner surface of the tunnel lining;
A ring member forming step of forming a ring member so as to cover the pressure-resistant tube from the inside of the tunnel;
An expansion material filling step of filling the pressure resistant tube with an expansion material.

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