JP5339462B2 - Water cut off structure of large section tunnel - Google Patents

Description

  The present invention relates to a water stop structure of a large-section tunnel constructed by using a plurality of tunnels arranged side by side by a propulsion method.

  After constructing multiple small-section tunnels, remove the unnecessary lining of each tunnel to form a large space, and use the remaining lining of each tunnel to install the top plate and side walls of the main building. The construction technique of the large section tunnel to form is known. Note that the plurality of small-section tunnels are sequentially constructed with a time difference, and the succeeding tunnel is constructed next to the preceding tunnel. Each tunnel is constructed by, for example, a propulsion method.

  Here, the propulsion method is a method of constructing a tunnel by sequentially press-fitting a cylindrical propulsion box (tunnel box), which becomes a tunnel lining, into the ground from a wellhead. In addition, a blade edge, an excavation machine, etc. are attached to the front-end | tip of a propulsion box. The propulsion method excavator may be one that digs itself by taking a reaction force to the propulsion box (that is, one that is equipped with a propulsion jack), or the thrust of the main jack transmitted through the propulsion box You may dig by.

  By the way, when constructing a small-section tunnel by the propulsion method, especially when pushing the propelling box with a main jack from the rear of the tunnel, the following tunnel may not be propelled parallel to the preceding tunnel. is there. Therefore, in order to propel the preceding tunnel in parallel along the following tunnel, as shown in FIG. 9, the propulsion box 101 of one of the two tunnels 100, 100 has a A guide groove 102 that opens to the other tunnel 100 side is formed along the tunnel axis direction, and a protrusion 103 that loosely fits in the guide groove 102 of one tunnel is formed in the propulsion box 101 of the other tunnel 100. A large-section tunnel has been proposed (see, for example, Patent Document 1).

  In the large-section tunnel having such a configuration, the gap between the adjacent tunnels 100 and 100 is sealed by filling the water stop material 104 between the protrusion 103 and the guide groove 102. However, in the above-described large cross-section tunnel, the guide groove 102 is washed to remove the clogging material clogged therein and then filled with the water stop material 104. Therefore, the construction requires a lot of labor and time. was there.

  Therefore, as shown in FIG. 10, a water-swellable elastic seal member 112 is provided on the outer surface of the propulsion box 111 of one tunnel 110 and is brought into contact with the outer surface of the propulsion box 111 of the other tunnel 110. A water stop structure was developed. In this water-stopping structure, the elastic seal member 112 is sandwiched between the propelling boxes 111 and 111 to stop the gap between the propelling boxes 111 and 111 (see, for example, Patent Document 2). According to this water stop structure, the water stop effect between the small cross-section tunnels can be obtained with relatively easy construction.

JP 2006-90098 A JP 2009-114786 A

  However, in the water stop structure, the tip of the elastic seal member 112 provided in the propulsion box 111 of one tunnel 110 abuts on the surface of the iron plate constituting the propulsion box 111 of the other tunnel 110. Therefore, there is a problem that the elastic seal member 112 is slippery with respect to the other propelling box 111 and has low adhesion. In addition, in the joint of the other propelling box 111 or the like, if there is a step on the outer peripheral surface, a portion where it is difficult for the elastic seal member 112 to contact is generated, leaving room for improvement in water stopping performance. It was.

  From such a viewpoint, an object of the present invention is to provide a water stop structure for a large-section tunnel that can improve water stop performance.

The present invention, which was created to solve such a problem, is a water stop structure of a large-section tunnel constructed by using a plurality of tunnels arranged in parallel by a propulsion method.
A linear elastic seal member provided along the propulsion direction on the outer surface of one of the two adjacent tunnels, and an elastic band member provided on the outer surface of the other tunnel,
The tip of the elastic seal member is in contact with the elastic band member, and the elastic band member is formed of a softer material than the elastic seal member and is configured to be deformed. It is a water blocking structure of a large-scale tunnel that is characterized.

  According to such a structure, since the front-end | tip part of an elastic seal member contact | abuts to an elastic band member, the adhesiveness between an elastic seal member and an elastic band member becomes high, and can aim at the improvement of water stop performance. Further, since the elastic band member is deformed, the step of the seam of the box can be absorbed, so that the elastic seal member and the elastic band member can be adhered over the entire length.

In the present invention, the elastic seal member comprises a base portion fixed to the outer surface of the one tunnel box, and a lip portion formed integrally with the base portion,
It is preferable that the lip portion is configured so that a tip end portion thereof abuts on the elastic band member to deform the elastic band member.

  According to such a configuration, since the elastic seal member is deformed so as to be reduced to the elastic band member, the contact area between the elastic seal member and the elastic band member is increased, and the elastic seal member is deformed by the elastic band member. Adhesion is further enhanced by receiving the reaction force. Furthermore, the concave surface of the elastic band member that has been depressed by being pushed into the elastic seal member serves as a pressing portion for the lip portion of the elastic seal member, and can be prevented from reversing (bending).

  Further, in the present invention, the elastic seal member is disposed so that a tip of the lip portion faces the outside of the large cross section tunnel, and the lip portion is caused by its restoring force or water pressure outside the large cross section tunnel. It is preferable that the elastic band member is deformed so as to be pushed away toward the inside of the large cross section tunnel, and a pressing portion for pressing the lip portion is formed inside the large cross section tunnel of the lip portion.

  According to such a configuration, since the reversal of the lip portion is suppressed by the pressing portion, it is possible to further improve the water stop performance.

Furthermore, in the present invention, in the water stop structure of a large section tunnel constructed using a plurality of tunnels arranged side by side by the propulsion method,
A linear elastic seal member provided along the propulsion direction on the outer surface of one of the two adjacent tunnels, and an elastic band member provided on the outer surface of the other tunnel,
The tip of the elastic seal member is in contact with the elastic band member,
The elastic seal member includes a base portion fixed to the outer surface of the one tunnel box, and a lip portion formed integrally with the base portion,
It is also preferable that the elastic band member includes a water-swelling rubber disposed on at least a part of the surface inside the tunnel having a larger cross section than the lip portion .

  According to such a configuration, when the water-swelling rubber absorbs moisture, the water-swelling rubber expands and presses the elastic seal member, so that the adhesion between the elastic seal member and the elastic band member is increased, and the water stop performance is improved. be able to.

  According to this invention, the outstanding effect that the water stop performance of a large section tunnel can be improved is exhibited.

It is sectional drawing which showed the large section tunnel. It is an expanded sectional view showing a first embodiment of a water stop structure concerning the present invention. It is the perspective view which showed the preceding tunnel box and the following tunnel box. It is sectional drawing which showed the state before the promotion of each adjacent tunnel box. It is the perspective view which showed the joining state of the tunnel box and the elastic belt member. (A), (b), (c), (d) is sectional drawing which showed the joining state of the elastic belt member. It is the expanded sectional view which showed 2nd embodiment of the water stop structure which concerns on this invention. (A), (b) is the expanded sectional view which showed 3rd embodiment of the water stop structure which concerns on this invention. It is sectional drawing which showed the conventional water stop structure. It is sectional drawing which showed the other conventional water stop structure.

  Hereinafter, a first embodiment for carrying out the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, the water stop structure W1 which concerns on this embodiment is a structure which stops water between the inside (inner space part) and the exterior (natural mountain part) of the large cross-section tunnel 1. As shown in FIG. The large section tunnel 1 is constructed by using a tunnel box 10 of a plurality of tunnels (hereinafter sometimes referred to as “small section tunnel”) T1 arranged in parallel by a propulsion method. The large section tunnel 1 is constructed by using a plurality of (six in this embodiment) small section tunnels T1, T1,... Arranged in parallel so as to substantially include all of the transverse sections. The top plate 1A, the bottom plate 1B, and the side walls 1C and 1C are provided. Each small-section tunnel T1 is configured by a plurality of tunnel boxes 10 connected in the tunnel axis direction.

  As shown in FIGS. 2 and 3, a protrusion P1 is provided on the outer shell 11 of one of the two tunnels T1 and T1, and a guide groove is formed on the outer shell 11 of the other tunnel T1. D1 is formed. The guide groove D1 is formed along the tunnel axis direction (perpendicular to the paper surface in FIG. 2), and opens toward one tunnel T1. The protrusion P1 is loosely fitted in the guide groove D1 of the other tunnel T1. In the following, the protrusion P1 of one tunnel T1 and the guide groove D1 of the other tunnel T1 may be simply referred to as “joint J1”. And the water stop structure W1 which is the characterizing part of this invention is formed in the outer side (natural ground side) of the large-section tunnel 1 rather than this joint J1. In addition, the positional relationship between the joint J1 and the water stop structure W1 is not limited to this, and the joint may be formed on the outer side (ground side) of the large cross section tunnel than the water stop structure.

  The water stop structure W1 is provided on the linear elastic seal member 20 provided on the outer surface 10 ′ of one tunnel T1 and the outer surface 10 ′ of the other tunnel T1 of two adjacent tunnels T1 and T1. And an elastic band member 30. The elastic seal member 20 is provided on the outer surface 10 ′ of the tunnel box 10 (in this embodiment, the trailing tunnel box 10 a) of one of the tunnels T 1 along the propulsion direction (perpendicular to the page in FIG. 2). Yes. The elastic band member 30 is provided on the outer surface 10 'of the tunnel box 10 of the other tunnel T1 (the preceding tunnel box 10b in this embodiment). The elastic band member 30 extends along the propulsion direction (tunnel axis direction) and is disposed at a position facing the elastic seal member 20. Then, the tip of the elastic seal member 20 contacts the elastic band member 30 when the trailing tunnel box 10a is propelled. In FIG. 2, the elastic seal member 20 and the elastic band member 30 are illustrated with a slight gap so that they can be easily distinguished from each other. In addition, the deformed cross-sectional area of the elastic band member 30 is equivalent to the cross-sectional area pushed away by the elastic seal member 20 (the cross-sectional area reduced to the elastic band member 30), but is larger to emphasize the pressing portion. It is shown in the figure.

  As shown in FIGS. 2 and 4, the elastic seal member 20 is provided in a portion of the outer surface 10 ′ of the trailing tunnel box 10 a that faces the preceding tunnel box 10 b. The elastic seal member 20 is fixed to the concave groove 12. The concave groove 12 is formed in the outer shell 11 constituting the outer surface 10 'of the trailing tunnel box 10a. The elastic seal member 20 is made of a material such as hard rubber or urethane having wear resistance, for example. The elastic seal member 20 extends along the propulsion direction and is provided continuously without a gap (see FIG. 3). The elastic seal member 20 is formed to have a length equivalent to the axial length of the tunnel box 10. Note that the elastic seal member 20 may be longer than the axial length of the tunnel box 10 as long as the elastic seal member 20 can be handled during transportation or in a vertical shaft. The elastic seal member 20 is integrated in a long length at the construction site by heat-welding the ends. The elastic seal member 20 includes a base portion 21 fixed along the outer surface 10 ′ of the trailing tunnel box 10 a and a lip portion 22 formed integrally with the base portion 21.

  The base portion 21 is formed in a plate shape, and the thickness dimension thereof is equal to the depth dimension of the concave groove 12. The surface of the base portion 21 is flush with the portion of the outer surface 10 ′ where the concave groove 12 is not present (the opening tip position of the concave groove 12). The base portion 21 is accommodated in the concave groove 12, and is fixed to the concave groove 12 by fixing means such as an adhesive or a bolt (not shown), for example. In the present embodiment, the base portion 21 is housed and fixed in the concave groove 12, but is not limited to this, and may be directly fixed to a planar outer surface where no concave groove is formed. .

  The lip portion 22 rises obliquely from the surface of the base portion 21. The lip portion 22 is an elastically tiltable portion and is tilted toward the trailing tunnel box 10a by being sandwiched between the trailing tunnel box 10a and the preceding tunnel box 10b. At this time, the lip portion 22 elastically presses the surface of the elastic band member 30 so as to return to the preceding tunnel box 10b side by a force to restore the original shape.

  The elastic seal member 20 is disposed so that the tip of the lip portion 22 faces the outside (the natural mountain side) of the large-section tunnel 1. That is, the groove 23 formed by the base portion 21 and the lip portion 22 is disposed so as to open toward the natural ground outside the large-section tunnel 1. And when the pressure (ground water pressure) outside the large cross-section tunnel 1 acts on the groove 23 portion of the elastic seal member 20, the lip portion 22 is applied to the elastic band member 30 on the outer surface 10 ′ of the preceding tunnel box 10b. It is pressed and comes into close contact.

  The elastic band member 30 is provided on a portion of the outer surface 10 ′ of the preceding tunnel box 10 b that faces the elastic seal member 20. The elastic band member 30 is fixed to the concave groove 13. The concave groove 13 is formed in the outer shell 11 constituting the outer surface 10 'of the preceding tunnel box 10b. In this embodiment, the elastic band member 30 is made of a softer material (having a lower rubber hardness) than the elastic seal member 20, such as rubber or urethane having wear resistance. The elastic band member 30 may be formed of water swelling rubber (refer to the third embodiment for details). The elastic band member 30 is provided continuously along the propulsion direction (see FIG. 4).

  As shown in FIG. 5, the elastic band member 30 is formed in a plate shape, and a plurality of elastic band members 30 are connected in the propulsion direction. The elastic band member 30 is formed to have a length equivalent to the axial length of the tunnel box 10 or a transportable length. The elastic band member 30 is integrated into a long length at the construction site by thermally welding the end portions. The elastic band member 30 is arranged so that the heat welding position is aligned with the joining position of the tunnel boxes 10 and 10. In addition, the relationship between the heat welding position of the elastic band member 30 and the joining position of the tunnel boxes 10 and 10 is not limited to this, and the heat welding position is in the axial middle part of the tunnel box. It may be located. Further, the elastic band member may be a long member and fixed across a plurality of tunnel boxes. The concave groove 13 is formed so as to be connected linearly when the preceding tunnel box 10b is joined. The elastic band member 30 has a thickness dimension equivalent to the depth dimension of the concave groove 13, and the surface of the elastic band member 30 is flush with the surrounding outer surface 10 '(see FIG. 4). In this way, when the elastic band member 30 is accommodated in the concave groove 13 and the surface of the elastic band member 30 and the outer surface 10 ′ of the portion where the concave groove 13 is not formed are flush with each other, the preceding tunnel box In addition to suppressing resistance during propulsion of 10b, wear of the elastic band member 30 can be suppressed.

  As shown in FIG. 6A, the elastic band member 30 is accommodated inside the concave groove 13 and is fixed to the bottom surface and the side surface of the concave groove 13 by, for example, an adhesive 14. The fixing of the elastic band member 30 is not limited to the above configuration. For example, as shown in FIG. 6B, the elastic band member 30a is fixed to the preceding tunnel using a fixing means such as a bolt B. You may make it fix to the box 10b. In this case, the accommodating portion 13a of the bolt head B1 is formed on both sides in the width direction of the concave groove 13, the bolt B is screwed into the accommodating portion 13a, and the elastic band is formed at the edge of the washer 15 that is pressed by the bolt head B1. The member 30a is locked. The elastic band member 30a has a convex shape with a central portion in the height direction protruding. At this time, since the middle portion in the width direction of the elastic band member 30a serves as a contact portion of the elastic seal member 20, it is part of both ends in the width direction of the elastic band member 30a that is locked by the edge of the washer 15. Only. Also at this time, it is preferable to apply the adhesive 14 to the inner periphery of the groove 13 and fix the elastic band member 30a because the water stop performance is improved.

  Further, as shown in FIG. 6C, even if the elastic band member 30a having a cross section larger than that of the concave groove 13 (indicated by a two-dot chain line in the figure) is accommodated in the concave groove 13 in a compressed state. Good. In this case, the wall surface of the groove 13 is pressed by the restoring force that the elastic band member 30a tries to return to the original size. Since the other configuration is the same as that of FIG. 6B, the same reference numerals are given and the description is omitted. According to such a configuration, the elastic band member 30a can be fixed to the concave groove 13 without using an adhesive, and water stoppage between the elastic band member 30a and the concave groove 13 can be secured.

  In the present embodiment, the elastic band member 30 is fixed in such a manner that the surface is accommodated in the groove 13 and is not limited thereto. For example, the elastic band member may be formed so that the tip of the elastic band member protrudes from the concave groove to the side of the subsequent tunnel box, or the elastic band member is directly bonded to a flat outer surface where no concave groove is formed. It may be fixed. Thus, when it comprises so that an elastic belt member may protrude rather than the outer surface of a preceding tunnel box, the protrusion dimension of an elastic seal member can be made small. Further, by making the elastic band member protrude, it is possible to further improve the adhesion with the elastic seal member.

  In the case where the elastic band member 30a is fixed to the flat outer surface 10 'without forming the concave groove, a structure as shown in FIG. First, the convex elastic band member 30 a is fixed to the flat outer surface 10 ′ using the adhesive 14. And the width direction both ends of the elastic belt member 30a are latched by the washer 15a with a level | step difference. The washer 15 a is fixed to the outer surface 10 ′ of the tunnel box 10 by a bolt B.

  Hereinafter, the operation and effect of the water stop structure W1 having the above-described configuration will be described while explaining the construction process of the large-section tunnel 1.

  In order to build the large-section tunnel 1, first, as shown in FIG. 1, the first tunnel T11 is constructed at the lower center in the section, and the second tunnel is next to both sides of the first tunnel T11. The tunnel T12 and the third tunnel T13 are sequentially constructed. Subsequently, a fourth tunnel T14 is constructed vertically (upper) next to the first tunnel T11, and a fifth tunnel T15 is constructed at a position adjacent to the tunnel T12 and the tunnel T14, and the tunnel T13 and the tunnel T14 are constructed. A sixth tunnel T16 is constructed at a position adjacent to. The construction order of the tunnels T11 to T16 is not limited to that shown in the figure, and may be changed as appropriate. In the present embodiment, adjacent tunnels T1 and T1 are guided so as to be parallel to each other via the joint J1 when the subsequent tunnel T1 is constructed.

  As described above, when the trailing tunnel box 10a propels the side or upper portion of the preceding tunnel box 10b, as shown in FIG. 2, the lip of the elastic seal member 20 on the trailing tunnel box 10a side is provided. The part 22 abuts on the elastic band member 30 on the preceding tunnel box 10b side. At this time, since the elastic band member 30 is made of a softer material than the elastic seal member 20, the tip of the lip portion 22 of the elastic seal member 20 is pushed into the surface of the elastic band member 30. . A recess is formed in the elastic band member 30 along the shape of the tip of the lip 22. At this time, the portion pushed away by the distal end portion of the lip portion 22 moves to the inside (inner side) of the large cross-section tunnel 1 to form the pressing portion 31. The pressing portion 31 is formed inside the large-section tunnel 1 than the lip portion 22. Here, the deformation amount of the elastic band member 30 is larger than the deformation amount of the lip portion 22 of the elastic seal member 20, and the elastic band member 30 having a large volume is pushed away by the lip portion 22 to form a large pressing portion 31. Is done.

  According to the water stop structure W1 configured as described above, the distal end portion of the elastic seal member 20 abuts on the elastic band member 30 that is not a metal, and thus the mutual frictional resistance is increased. Therefore, the adhesiveness between the elastic seal member 20 and the elastic band member 30 is increased, and the slip of the lip portion 22 can be suppressed. Thereby, the inversion (dripping) to the inner side of the lip part 22 can be suppressed, and the water stop performance can be improved.

  Further, since the elastic band member 30 is made of a softer material than the elastic seal member 20, the elastic band member 30 is deformed so as to be reduced into the elastic band member 30. As a result, the contact area between the elastic seal member 20 and the elastic band member 30 is increased, so that the adhesion is further enhanced. Further, due to mutual deformation, the restoring force of the elastic seal member 20 (reaction force due to the bending of the lip portion 22) and the restoring force of the elastic band member 30 (stress that the concave portion tries to return to each other) are pressed against each other. Since it acts, adhesiveness becomes still higher.

  Further, the concave surface (the surface of the pressing portion 31) of the elastic band member 30 depressed by being pushed into the elastic seal member 20 abuts on the lip portion 22 of the elastic seal member 20 to serve as a stopper. Therefore, it is possible to prevent the lip portion 22 from being further deformed inward (inside the large cross-section tunnel 1) and to suppress the reversal (dripping), so that the water stop performance is greatly improved.

  The distal end portion of the lip portion 22 is curved by being pushed toward the trailing tunnel box 10a. At this time, the elastic band member 30 is pressed by the reaction force (restoring force) of the lip portion 22; The adhesiveness with is further increased. Further, when the water pressure on the natural ground side is applied to the lip portion 22, the water pressure is applied in a direction in which the lip portion 22 is pressed against the elastic band member 30 side, so that the adhesion is further enhanced.

  Moreover, since the elastic sealing member 20 and the elastic band member 30 are each integrated by thermal welding, the sealing is not interrupted. Furthermore, since the elastic band member 30 is provided, even if a step is generated at the joint between the preceding tunnel boxes 10b, the step can be absorbed by the deformation of the elastic band member 30, so that the surface of the elastic band member 30 Can maintain a planar shape. Therefore, adhesiveness with the elastic seal member 20 can be ensured, and a decrease in water stop performance can be prevented.

  Next, with reference to FIG. 7, a second embodiment for carrying out the present invention will be described. In the water stop structure W2 according to the second embodiment, a tapered claw portion 25 is formed at the tip of the lip portion 22 of the elastic seal member 20. The claw portion 25 is formed so as to protrude forward from the tip of the lip portion 22 and has a tapered cross-sectional shape with a sharp tip. As described above, since the claw portion 25 is formed at the tip of the elastic seal member 20, when the elastic seal member 20 abuts on the elastic band member 30, it is further recessed in the concave portion on the surface of the elastic band member 30. The nail | claw part accommodation groove | channel 32 will be formed. In addition, since the other structure is the same as that of 1st embodiment, it attaches | subjects the same code | symbol and abbreviate | omits description.

  According to the above configuration, the claw portion 25 constitutes a locking portion for the elastic band member 30, and the effect of preventing the elastic seal member 20 from being reversed is enhanced. Moreover, since the contact area of the elastic seal member 20 and the elastic band member 30 becomes large, mutual adhesiveness can be improved further. Furthermore, since the tip of the claw portion 25 has an acute cross-sectional shape, the folded portion of the concave portion of the elastic band member 30 also has an acute angle. Therefore, it becomes difficult for water to flow around, and the water stop effect is further improved.

  Next, a third embodiment for carrying out the present invention will be described with reference to FIG. The water stop structure W3 according to the third embodiment is characterized in that the elastic band member 35 includes a water-swelling rubber disposed at least on a part of the surface. The elastic belt member 35 shown in FIG. 8A includes a water swelling rubber 36 provided on the entire surface and an elastic rubber 37 provided in the back thereof. The water swelling rubber 36 expands when it absorbs moisture. The elastic rubber 37 is made of a material such as rubber or urethane, for example. Since the elastic seal member 20 has the same configuration as that of the first embodiment, the same reference numerals are given and description thereof is omitted. According to the water stop structure W3 having such a configuration, when the water-swelling rubber 36 absorbs moisture, it expands toward the elastic seal member 20 as shown by a broken line in the figure, and presses the elastic seal member. The adhesion between the elastic seal member 20 and the elastic band member 35 is increased, and the water stop performance can be improved. Further, the water-swelling rubber 36 expanded inside the tunnel having a larger cross section than the lip portion 22 constitutes the pressing portion 31 (indicated by a broken line in the figure), and therefore, the lip portion 22 is inverted (curled) inside. Can be suppressed.

  Note that the installation position of the water-swelling rubber 36 is not limited to the above-described configuration, and as shown in FIG. 8B, the surface of the elastic band member 35 has a larger cross-sectional tunnel than the lip portion 22. You may make it provide the water swelling rubber | gum 36 only in an inner part. Even with such a configuration, as in FIG. 8A, when the water-swelling rubber 36 absorbs moisture, it expands toward the elastic seal member 20 as shown by a broken line in the drawing, and the elastic seal member is Since it presses, the adhesiveness between the elastic seal member 20 and the elastic belt member 35 becomes high, and the water stop performance can be improved. Moreover, since the expanded water swelling rubber 36 comprises the press part 31 (it shows with a broken line in the figure), it can suppress inversion (dripping) to the inner side of the lip part 22. FIG. In this embodiment, the water-swelling rubber 36 is provided only on a part of the elastic band member 35. However, the entire elastic band member may be formed of water-swelling rubber.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not the meaning limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention. For example, in the present embodiment, the elastic seal member 20 is configured by the base portion 21 and the lip portion 22, but is not limited to this shape, and may be provided with a protrusion that is reduced to the elastic band member 30. For example, other shapes may be used.

W1 water stop structure T1 (small cross section) tunnel 1 large cross section tunnel 10 tunnel box 10 'outer surface 20 elastic seal member 21 base portion 22 lip portion 30 elastic band member 31 holding portion 36 water swelling rubber

Claims (4)

In the water stop structure of a large section tunnel constructed using multiple tunnels arranged side by side by the propulsion method,
A linear elastic seal member provided along the propulsion direction on the outer surface of one of the two adjacent tunnels;
An elastic band member provided on an outer surface of the other tunnel, the elastic band member is formed of a softer material than the elastic seal member, and a distal end portion of the elastic seal member is formed on the elastic band member. A water stop structure for a large-section tunnel, characterized in that the elastic band member is deformed when abutted.
The elastic sealing member includes a base portion fixed to an outer surface of said one of the tunnel a box body made and a the base portion and integrally formed lip portion, the lip, its tip The water stop structure for a large-section tunnel according to claim 1, wherein the structure is configured to deform the elastic band member in contact with the elastic band member.
The elastic seal member is disposed so that a tip of the lip portion faces the outside of the large cross-section tunnel, and the lip portion causes the elastic band member to be moved by the restoring force or water pressure outside the large cross-section tunnel. The large cross section according to claim 2, wherein a pressing portion for pressing the lip portion is formed inside the large cross section tunnel by being deformed so as to be pushed away toward the inner side of the cross section tunnel. The water stop structure of the tunnel.
In the water stop structure of a large section tunnel constructed using multiple tunnels arranged side by side by the propulsion method,
A linear elastic seal member provided along the propulsion direction on the outer surface of one of the two adjacent tunnels, and an elastic band member provided on the outer surface of the other tunnel, the elastic seal The tip of the member is in contact with the elastic band member, and the elastic seal member includes a base portion fixed to the outer surface of the one tunnel box and a lip portion formed integrally with the base portion. And
The water stop structure of a large cross section tunnel, wherein the elastic band member is configured to include a water-swelling rubber disposed on at least a part of the surface inside the large cross section tunnel than the lip portion .

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