JP5782358B2 - Seal structure between tunnels - Google Patents

Description

  The present invention relates to an inter-tunnel seal structure provided between a preceding tunnel and a succeeding tunnel constructed next to the preceding tunnel.

  In recent years, after constructing multiple small cross-section tunnels, unnecessary lining of each tunnel is removed to form a large space, while the remaining lining of each tunnel is used to construct the top plate and sidewall A technique for constructing a large-section tunnel is known by forming, for example. 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 on 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.

  Of the two adjacent tunnels, a seal member is provided along the propulsion direction on the outer surface of the succeeding tunnel facing the preceding tunnel (see, for example, Patent Document 1). As shown in FIG. 7, the seal member 100 includes a base portion 101 fixed to the outer surface of the trailing tunnel 110a, and a lip portion that is formed integrally with the base portion 101 and has a tip facing the outside of the large-section tunnel. 102. The lip portion 102 is configured to be elastically pressed toward the outer surface of the preceding tunnel 110b by water pressure from the outside of the large-section tunnel.

JP 2010-133100 A

  In the seal structure as in Patent Document 1, when the separation distance between the preceding tunnel 110b and the following tunnel 110a is an appropriate distance (see FIG. 7A), the lip portion 102 is at a predetermined pressure. Since it contacts the surface of the preceding tunnel 110b, a sealing function can be secured. However, when the trailing tunnel 110a is too close to the preceding tunnel 110b (see FIG. 7B), the surface of the lip portion 102 is in surface contact with the surface of the preceding tunnel 110b, and therefore the leading tunnel 110b. The contact area of the lip part 102 with respect to the surface becomes excessive, and the contact pressure (surface pressure) becomes small. Therefore, there is a possibility that sufficient sealing performance cannot be obtained.

  From such a viewpoint, an object of the present invention is to provide an inter-tunnel seal structure that can obtain a sufficient sealing performance even when a subsequent tunnel is close to a preceding tunnel.

The invention according to claim 1 for solving such a problem is that, in an inter-tunnel seal structure provided between a preceding tunnel and a succeeding tunnel constructed adjacent thereto, along the propulsion direction of the succeeding tunnel. The seal member includes a base portion fixed to the following tunnel, and a lip portion that rises obliquely from the base portion toward the preceding tunnel, and faces the preceding tunnel. A protrusion is formed on the surface of the lip portion along the extending direction of the seal member, and a seal receiving groove for receiving the seal member is formed in the trailing tunnel, and the lip The protrusion is formed on the surface of the base end portion connected to the base portion of the portion, and the surface of the base end portion is located inside the seal housing groove and formed on the surface of the base end portion. Serial is a tunnel between the sealing structure, wherein the protrusion is protruded to the preceding tunnel side from the open end of the seal housing groove.

According to the present invention, even when the succeeding tunnel is too close to the preceding tunnel, the surface of the lip around the ridge does not contact the preceding tunnel because the ridge contacts the preceding tunnel. . As a result, it is possible to prevent the contact area of the lip portion from becoming excessive, so that a decrease in contact pressure can be avoided, and sufficient sealing performance can be obtained. Furthermore, even when the separation distance between the trailing tunnel and the preceding tunnel becomes zero, a gap is secured around the ridge, so that the pressing force of the lip portion gathers on the ridge and increases the contact pressure. (See FIG. 1B and FIG. 5B).

  The invention according to claim 2 is characterized in that the protrusion is formed at the tip of the lip portion.

  According to the present invention, even when the separation distance between the succeeding tunnel and the preceding tunnel is appropriate (when not too close), the ridges contact the preceding tunnel, so the lip portion tries to push the preceding tunnel. Force (pressing force) collects on the ridge, and the contact pressure can be increased. Thereby, sealing performance can be improved.

  According to the inter-tunnel seal structure of the present invention, sufficient sealing performance can be obtained even when the succeeding tunnel is close to the preceding tunnel.

(A) is sectional drawing which showed the seal structure between tunnels which concerns on 1st embodiment of this invention, (b) is the principal part enlarged view of the seal structure between tunnels. It is sectional drawing which showed the sealing structure between tunnels of the state in which the succeeding tunnel was spaced apart from the preceding tunnel. It is the perspective view which showed the sealing member. It is sectional drawing which showed the large section tunnel. (A) is sectional drawing which showed the seal structure between tunnels which concerns on 2nd embodiment of this invention, (b) is the principal part enlarged view of the seal structure between tunnels. (A) is sectional drawing which showed the seal structure between tunnels in the state in which the succeeding tunnel was spaced apart from the preceding tunnel, (b) is a principal part enlarged view. It is the figure which showed the conventional sealing structure, Comprising: (a) is sectional drawing which showed the case where the distance between a preceding tunnel and a succeeding tunnel is an appropriate distance, (b) is a succeeding tunnel with respect to a preceding tunnel. It is sectional drawing which showed the case where it adjoined too much.

(First embodiment)
An inter-tunnel seal structure according to a first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a state in which the succeeding tunnel is above the preceding tunnel.

  As shown in FIG. 4, the seal structure S between tunnels has an inside (inner space) and an outside (natural area) of a large-section tunnel 1 constructed by using a plurality of tunnels 10 arranged in parallel by a propulsion method. It is a structure that stops water between. The large-section tunnel 1 is constructed by using a plurality of (six in this embodiment) tunnels 10, 10,... Arranged side by side so as to substantially include all of the transverse sections. A plate 1A, a bottom plate 1B, and side walls 1C and 1C are provided. Each tunnel 10 is configured by a tunnel box connected in the axial direction.

  The tunnel sealing structure S includes a seal member 30 and a seal contact member 50. As shown in FIG. 2, the seal member 30 is provided so as to close a gap between two adjacent tunnels 10 and 10. The seal member 30 is provided in a portion of the surface of one tunnel 10 (following tunnel 10a) that faces the other tunnel 10 (preceding tunnel 10b). A seal contact member 50 is embedded in the surface of the preceding tunnel 10b. The seal member 30 is disposed to face the seal contact member 50, and is accommodated in a seal accommodation groove 15 formed at a predetermined depth on the outer peripheral surface of the subsequent tunnel 10a. The seal member 30 is made of, for example, an elastic material such as hard rubber or urethane having wear resistance. The seal member 30 is continuously provided along the propulsion direction. The seal member 30 includes a base portion 31 and a lip portion 32.

  The base portion 31 is a portion fixed to the trailing tunnel 10a, and is formed in a long plate shape that is continuous along the propulsion direction (the direction perpendicular to the paper surface of FIG. 2). The base portion 31 is locked at both ends in the width direction by pressing plates 33 and 33. The thickness dimension (the dimension from the tip of the bottom ridge 39 to be described later to the surface on the preceding tunnel 10b side) of the width direction end portion (the portion pressed by the pressing plate 33) of the base portion 31 is the pressing plate 33 and the seal receiving groove. It is slightly larger than the distance from the bottom surface of 15. The holding plates 33 are provided at both ends in the width direction of the base portion 31. The pressing plate 33 extends along the longitudinal direction of the seal member 30 (the direction perpendicular to the paper surface of FIG. 2), and is fixed to the bottom surface of the seal housing groove 15 by a fixing means such as a bolt B. The pressing plate 33 has an L-shaped cross section. Bolt through holes 34 are formed in the pressing plate 33. The bolt B is inserted into the bolt through hole 34 and the through hole 36 on the bottom surface of the seal housing groove 15, and is welded and fixed to the back surface of the bottom surface so as to be screwed onto the screw member 37. The pressing plate 33 adjacent to the base end of the lip portion 32 has a surface flush with the outer surface of the trailing tunnel 10a (the opening end of the seal housing groove 15). The pressing plate 33 positioned on the distal end side of the lip portion 32 has a surface deeper than the outer surface of the trailing tunnel 10 a, and is lipted to a space closer to the opening end of the seal housing groove 15 than the pressing plate 33. The tip of the portion 32 can be accommodated.

  A bottom ridge 38 extending in the longitudinal direction is formed on the bottom surface of the base portion 31 (the surface facing the bottom surface of the seal housing groove 15). The bottom ridges 38 have a semicircular cross section and are formed in the vicinity of both ends of the base portion 31 in the width direction. In a state where the base portion 31 is pressed by the pressing plates 33, 33, the protruding portion of the bottom protrusion 38 is pressed against the bottom surface of the seal housing groove 15 and is in a state of being elastically deformed flat. Thereby, the sealing performance between the outer surface of the trailing tunnel 10a (the bottom surface of the seal housing groove 15) and the base portion 31 is ensured. The number of bottom protrusions 38 is not limited to two, and may be one or three or more. Moreover, the cross-sectional shape of the bottom protrusion 38 is not limited to a semicircular shape, and a shape with a tapered tip, such as a triangular shape or a polygonal shape, is preferable. Furthermore, the cross-sectional shape of the bottom ridge 38 may be a cross-sectional rectangular shape having the same width toward the tip side.

  In the present embodiment, the bottom ridge 38 is formed on the base portion 31, but may not be formed. Even in this case, the base portion 31 is in close contact with the bottom surface of the seal housing groove 15 because both ends in the width direction are locked by the pressing plates 33 and 33 and tightened. Thereby, the sealing property between the surface of the trailing tunnel 10a and the base portion 31 is ensured.

  The lip portion 32 is formed integrally with the base portion 31. The lip portion 32 rises obliquely from the surface of the base portion 31 toward the preceding tunnel 10b, and the cross-section of the base portion 31 and the lip portion 32 is substantially V-shaped (the lip portion 32 is downward in FIG. 2). Is arranged). The lip portion 32 is a portion that can be elastically tilted and deformed with respect to the base portion 31. The lip portion 32 extends toward the preceding tunnel 10b, and the outer surface of the preceding tunnel 10b is tilted from the initial state (the lip portion 32 is close to the base portion 31). To touch. At this time, the lip portion 32 comes into close contact with the preceding tunnel 10b by a force for restoring the initial state.

  As shown in FIGS. 2 and 3, a protrusion 39 is formed on the surface of the lip portion 32 (the surface facing the preceding tunnel 10 b) along the extending direction of the seal member 30. The protrusion 39 has a semicircular cross section (see FIG. 3), and is formed at the tip end portion of the lip portion 32 and at two locations closer to the base end portion than the position thereof. The two ridges 39, 39 have the same cross-sectional shape and are arranged in parallel to each other. The protrusion 39 on the distal end is formed closer to the distal end than the intermediate portion in the protruding direction of the lip 32 on the proximal end side. The protrusion 39 near the proximal end is formed closer to the proximal end than the intermediate portion in the protruding direction of the lip portion 32. In a state where the trailing tunnel 10a is close to the preceding tunnel 10b, the protrusion 39 is pressed against the surface of the preceding tunnel 10b (the surface of the seal contact member 50), and a part of the surface of the protrusion 39 (protruding end). Part) is elastically deformed flat (see FIG. 2). Depending on the distance between the trailing tunnel 10a and the preceding tunnel 10b, the ridge 39 is deformed when only the ridge 39 near the tip is in contact with the preceding tunnel 10b, and the ridge 39 near the tip There are cases where both the protrusions 39 near the base end abut against the preceding tunnel 10b and deform. The number of ridges 39 is not limited to two, and may be one or three or more. Moreover, the cross-sectional shape of the protrusion 39 is not limited to a semicircular shape, and a shape with a tapered tip, such as a triangular shape or a polygonal shape, is preferable. Furthermore, the cross-sectional shape of the ridge 39 may be a rectangular cross-sectional shape having the same width toward the distal end side.

  The seal member 30 is disposed so that the tip of the lip portion 32 faces the outside of the large-section tunnel 1 (see FIG. 4). That is, a groove having a substantially V-shaped cross section formed by the base portion 31 and the lip portion 32 is disposed so as to open toward the outside of the large cross-section tunnel 1. As a result, pressure (water pressure or earth pressure) from the outside of the large-section tunnel 1 acts on a groove portion having a substantially V-shaped section of the seal member 30. That is, the surface of the lip portion 32 on which the protrusions 39 are formed is pressed against the outer surface of the preceding tunnel 10b by the pressure outside the large cross-section tunnel 1 in accordance with the restoring force, and closely contacts the preceding tunnel 10b. . This restoring force and the pressure outside the large-section tunnel 1 become the pressing force of the lip portion 32.

  The seal housing groove 15 is formed on the surface of the trailing tunnel 10a composed of a plurality of propulsion boxes located behind the excavator (not shown). The seal housing groove 15 is formed in a portion of the surface of the trailing tunnel 10a that faces the preceding tunnel 10b, and extends along the propulsion direction. The seal housing groove 15 has a rectangular cross section, and is partitioned by side plates 16 a and 16 a and a bottom plate 16 b that are welded and fixed inside an opening formed in the skin plate 11 on the surface of the tunnel 10. The seal accommodating groove 15 has a width dimension larger than the width dimension of the seal member 30 so that the seal member 30 can be accommodated. As shown in FIG. 2, the seal accommodation groove 15 has a depth dimension that is larger than the thickness dimension of the base portion 31 and smaller than the thickness dimension of the entire seal member 30. A part of the tip side of the lip portion 32 (opposite side of the base end side connected to the base portion 31) protrudes from the open end of the seal housing groove 15 when housed in the seal housing groove 15.

  In addition, although the sealing member 30 is formed in the cross-sectional substantially V shape, it is not the meaning which limits the structure of the sealing member 30. FIG. For example, other shapes such as a U-shaped section, an L-shape, and a T-shape may be used. Moreover, the structure of the sealing member 30 is not limited to this embodiment, For example, the thing of the structure filled with the fluid inside a bag body and pressed by a preceding tunnel may be sufficient.

  The seal contact member 50 is in contact with the tip of the seal member 30. As with the seal member 30, the seal contact member 50 is made of, for example, a material such as hard rubber or urethane having wear resistance. The seal contact member 50 is embedded in the surface of the preceding tunnel 10b. Specifically, the seal contact member 50 is disposed in parallel with the seal member 30 so as to face the seal member 30, and is received in the contact member receiving groove 20 formed on the outer peripheral surface of the preceding tunnel 10b. ing. The seal contact member 50 has a convex cross-sectional shape with a projecting central portion in the width direction, and the lip portion 32 of the seal member 30 contacts the tip surface of the top (the surface exposed on the surface of the preceding tunnel 10b). It comes to slide. The front end surface of the seal contact member 50 is flush with the outer surface of the preceding tunnel 10b (open end of the contact member housing groove 20). Of the stepped portions 50a and 50b on both sides in the width direction of the seal contact member 50, the stepped portion 50a (on the left side in FIG. 2) located on the outer side of the large section tunnel is the stepped portion located on the inner side of the large section tunnel. It is taller (thicker) than 50b (right side in FIG. 2). The step portions 50a and 50b on both sides in the width direction of the seal contact member 50 may have the same height.

  The seal contact member 50 is locked at both ends in the width direction by pressing plates 53, 53. The pressing plate 53 extends along the longitudinal direction of the seal contact member 50 (the vertical direction in FIG. 2), and is fixed to the bottom surface of the contact member receiving groove 20 by a fixing means such as a bolt B. Yes. The pressing plate 53 has an L-shaped cross section. Bolt through holes 54 are formed in the pressing plate 53. The bolt B is inserted into the bolt through hole 54 and the through hole 56 on the bottom surface of the contact member housing groove 20, and is welded and fixed to the back surface of the bottom surface so as to be screwed onto the screw member 57. Both pressing plates 53, 53 are flush with the outer surface of the preceding tunnel 10 b (the opening end of the contact member receiving groove 20) and the surface of the seal contact member 50. Depending on the thickness of the stepped portions 50a, 50b of the seal contact member 50, the locking portion 53a (seal contact member) of the press plate 53 (the left press plate in FIG. 2) located outside the large cross-section tunnel. 50) is thinner than the locking portion 53b of the pressing plate 53 (the right pressing plate in FIG. 2) positioned on the inner side of the large section tunnel. When the step portions 50a and 50b on both sides in the width direction of the seal abutting member 50 are the same height, the locking portions 53a and the locking portions 53b of the left and right pressing plates 53 of the large cross section tunnel are also mutually connected. Same thickness.

  A bottom ridge 58 extending in the longitudinal direction is formed on the bottom surface of the seal contact member 50 (the surface facing the bottom surface of the contact member housing groove 20). Similarly to the bottom protrusions 38, the bottom protrusions 58 have a semicircular cross section and are formed in the vicinity of both ends in the width direction of the seal contact member 50. In a state where the seal abutting member 50 is pressed by the pressing plate 53, the protruding portion of the bottom ridge 58 is pressed against the bottom surface of the abutting member receiving groove 20, and is in a state of being elastically deformed flat. Thereby, the sealing performance between the outer surface of the preceding tunnel 10b (the bottom surface of the contact member housing groove 20) and the seal contact member 50 is ensured. Note that the number of the bottom protrusions 58 is not limited to two, and may be one or three or more. Moreover, the cross-sectional shape of the bottom protrusion 58 is not limited to a semicircular shape, and a shape with a tapered tip, such as a triangular shape or a polygonal shape, is preferable. Furthermore, the cross-sectional shape of the bottom ridge 58 may be a cross-sectional rectangular shape having the same width toward the tip side.

  In the present embodiment, the bottom protrusion 58 is formed on the seal contact member 50, but it may not be formed. Even in this case, since the seal contact member 50 is fastened with both ends in the width direction locked by the pressing plates 53, 53, the seal contact member 50 is in close contact with the bottom surface of the contact member accommodation groove 20. Thereby, the sealing property between the surface of the preceding tunnel 10b and the seal contact member 50 is ensured.

  The contact member accommodation groove 20 is formed on the surface of the preceding tunnel 10b. The contact member accommodation groove 20 is formed in a portion of the surface of the preceding tunnel 10b that faces the passing position of the seal member 30, and extends along the propulsion direction. The contact member receiving groove 20 has a rectangular cross section like the seal receiving groove 15, and side plates 26 a and 26 a that are welded and fixed to the inner side of the opening formed in the skin plate 11 on the surface of the tunnel 10. It is partitioned with a bottom plate 26b. The contact member accommodation groove 20 has a width dimension larger than the width dimension of the seal contact member 50 so that the seal contact member 50 can be accommodated. The contact member receiving groove 20 has a depth dimension substantially equal to the thickness dimension of the seal contact member 50 (thickness from the bottom protrusion 38 to the surface), and contacts the seal contact member 50. When housed in the member housing groove 20, the surface of the seal contact member 50 is flush with the outer surface of the preceding tunnel 10 b (open end of the contact member housing groove 20).

  Next, the shape and operation of the inter-tunnel seal structure S in a state in which the subsequent tunnel 10a is close to or away from the preceding tunnel 10b will be described with reference to FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, at the time of propulsion of the trailing tunnel 10 a, at least the tip portion of the lip portion 32 of the seal member 30 slides in a state of being in contact with the surface of the seal contact member 50.

  As shown in FIG. 1, when the succeeding tunnel 10a is too close to the preceding tunnel 10b and the skin plates 11 and 11 are in contact with each other (the separation distance is zero), the lip portion 32 is The surface is in a state of being substantially parallel to the surface of the seal contact member 50. At this time, since the protrusion 39 is formed on the surface of the lip portion 32, the protrusion 39 contacts the surface of the seal contact member 50. The surface of the lip portion 32 around the protrusion 39 does not come into contact. In the present embodiment, since the protrusion 39 is arranged at a predetermined distance from the tip of the lip portion 32, the tip of the lip 32 is pressed by water pressure or the like outside the large-section tunnel 1. It is elastically deformed toward the preceding tunnel 10b and is in contact with the surface of the seal contact member 50. In this way, the lip portion 32 partially abuts against the seal abutting member 50 and the entire surface does not abut against the seal abutting member 50, so that the contact area of the lip portion 32 can be prevented from becoming excessive. . Therefore, the pressing force of the lip portion 32 toward the preceding tunnel 10b can be applied to the contact surface having a relatively small area. As a result, a decrease in contact pressure can be avoided, and sufficient sealing performance can be obtained. Moreover, since the protrusion 39 is pressed and the protrusion end part is elastically deformed flatly, a seal width can be ensured and the sealing performance can be further improved. Furthermore, since the protrusion 39 is continuously formed along the longitudinal direction of the seal member 30, the sealing performance is not interrupted. Furthermore, since the double protrusions are formed by forming the protrusions 39 in two rows, the sealing performance is high.

  As shown in FIG. 2, when the succeeding tunnel 10a is separated from the preceding tunnel 10b, the lip portion 32 has only the tip portion (including the protrusion 39 near the tip portion in FIG. 2) being sealed. It contacts the contact member 50. At this time, since only the protrusion 39 near the tip and the surface of the lip 32 on the tip side of the protrusion 39 are in contact with the surface of the seal contact member 50, the contact area is relatively small. small. Therefore, the pressing force of the lip portion 32 toward the preceding tunnel 10b can be applied to the contact surface having a relatively small area, and a decrease in the contact pressure can be avoided, so that sufficient sealing performance can be obtained. Furthermore, since the protrusion 39 is in contact with the seal contact member 50, the pressing force applied to the lip portion 32 is concentrated on the protrusion 39, and a higher contact pressure than the surface of the lip portion 32 is applied. Enhanced.

  As described above, according to the inter-tunnel seal structure S of the present embodiment, even when the separation distance between the succeeding tunnel 10a and the preceding tunnel 10b is appropriate (when not too close), the protrusion 39 is formed on the preceding tunnel 10b. Since it contacts, the pressing force of the lip | rip part 32 can be concentrated on the protrusion 39, and the contact pressure to the preceding tunnel 10b can be raised. Thereby, sealing performance can be improved.

  Further, since the seal contact member 50 is provided opposite to the seal member 30, the adhesion between the lip portion 32 and the surface of the preceding tunnel 10b (the surface of the seal contact member 50) is increased, and the sealing performance is further improved. It can be further enhanced.

  As described above, according to the seal structure S between tunnels of the present embodiment, even when the succeeding tunnel 10a is separated from the preceding tunnel 10b, the succeeding tunnel 10a is too close to the preceding tunnel 10b and the lip portion 32 is advanced. Sufficient sealing performance can be obtained in any case where it is pressed against the tunnel 10b.

(Second embodiment)
A tunnel sealing structure according to a second embodiment of the present invention will be described in detail with reference to the accompanying drawings. The inter-tunnel seal structure S according to the second embodiment differs from the first embodiment in the position of the protrusion 39 formed on the seal member 30. Since other configurations are the same as those in the first embodiment, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 6, the protrusion 39 of the seal member 30 of the inter-tunnel seal structure S according to the present embodiment is formed on the surface of the base end portion (shoulder portion) 40 connected to the base portion 31 of the lip portion 32. Yes. The surface of the shoulder 40 is located inside the seal housing groove 15 (located on the bottom side of the seal housing groove 15 by a predetermined depth from the outer surface of the trailing tunnel 10a). A protrusion 39 formed on the surface of the shoulder 40 protrudes from the opening end of the seal housing groove 15 toward the preceding tunnel 10b (see FIG. 6B).

  According to the configuration as described above, as shown in FIG. 5, in the state where the trailing tunnel 10 a is in contact with the preceding tunnel 10 b, the protrusion 39 is formed on the surface of the preceding tunnel 10 b (the seal contact member 50 of the seal contact member 50). It is pressed against the surface), and a part of the surface (projecting end) of the protrusion 39 is in a state of being elastically deformed flat. At this time, since the surface of the shoulder 40 is located inside the seal housing groove 15, a gap can be secured around the ridge 39 between the leading tunnel 10 b and the surface of the shoulder 40 is the leading tunnel 10 b. Does not touch the surface of Thereby, the contact area to the preceding tunnel 10b can be reduced. Further, since the protrusion 39 contacts the surface of the seal contact member 50, stress acting on the shoulder 40 can be concentrated from the preceding tunnel 10b, so that the contact pressure can be increased and the sealing performance can be improved. it can.

  Further, as shown in FIG. 6, when the separation distance between the trailing tunnel 10 a and the preceding tunnel 10 b is appropriate, the lip portion 32 abuts the seal abutting member 50 at the tip portion. At this time, the contact area of the seal contact member 50 to the preceding tunnel 10b is relatively small. Therefore, the pressing force of the lip portion 32 toward the preceding tunnel 10b can be applied to the contact surface having a relatively small area, and a decrease in the contact pressure can be avoided, so that sufficient sealing performance can be obtained.

  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 inter-tunnel seal structure S according to the first embodiment, a protrusion 39 is formed at the tip of the lip portion 32, and in the inter-tunnel seal structure S according to the second embodiment, the shoulder portion 40 of the lip portion 32 is formed. Although the protrusion 39 is formed on the surface, it is not intended to limit the formation position of the protrusion 39. For example, the ridge 39 may be formed on the surface of the shoulder 40 (second embodiment) in accordance with the formation position of the ridge 39 of the first embodiment, or abuts on the surface of the other lip portion 32. You may form the protrusion 39 suitably in a part. Further, a protrusion may be formed on the distal end surface of the seal contact member 50.

  In the embodiment, the seal member 30 is accommodated in the seal accommodation groove 15 that is recessed from the outer peripheral surface of the subsequent tunnel. However, the seal member is not provided on the outer peripheral surface of the subsequent tunnel without providing the seal accommodation groove 15. May be installed. Also in this case, pressing plates are provided and fixed on both sides in the width direction of the seal member. Each pressing plate may have the same shape as the pressing plates 33 and 33 and an L-shaped cross section. The pressing plate is fixed to the outer peripheral surface of the succeeding tunnel by a bolt, and the sealing member is pressed and fixed from both sides in the width direction. Here, since the pressing plates on both sides constitute a wall surface, a seal accommodation groove is formed outside the outer peripheral surface of the succeeding tunnel. That is, the seal member is accommodated in the seal accommodation groove formed to protrude outside the outer peripheral surface of the trailing tunnel. And the lip | rip part of a sealing member will be in the state protruded to the preceding tunnel side rather than the outer peripheral side edge part (opening edge part of a seal | sticker accommodation groove | channel) of a pressing plate.

  Furthermore, in the above-described embodiment, the seal contact member 50 is accommodated in the contact member accommodating groove 20 that is recessed from the outer peripheral surface of the preceding tunnel, but the outer peripheral surface of the preceding tunnel is not provided with the contact member accommodating groove. You may install in. In this case, pressing plates are respectively provided and fixed on both sides in the width direction of the seal contact member. Each pressing plate at this time may have the same shape as the pressing plates 53, 53 and have an L-shaped cross section, and is fixed to the outer peripheral surface of the preceding tunnel with a bolt. Each pressing plate holds and fixes the seal contact member from both sides in the width direction. The front end surface of the seal abutting member is flush with the outer peripheral side end of the pressing plate. Here, since the pressing plates on both sides constitute a wall surface, the contact portion receiving groove is formed outside the outer peripheral surface of the preceding tunnel. That is, the seal abutting member is accommodated in the abutting portion accommodating groove formed to protrude outside the outer peripheral surface of the preceding tunnel.

  In this embodiment, the seal contact member 50 is provided at a position facing the seal member 30, but the seal member 30 is not provided on the surface of the skin plate 11 of the preceding tunnel 10b without providing the seal contact member 50. Even if it makes it contact | abut, an effect can be acquired.

S Inter-tunnel seal structure 10a Trailing tunnel 10b Preceding tunnel 15 Seal receiving groove 30 Seal member 39 Projection 50 Seal contact member

Claims (2)

In the inter-tunnel seal structure provided between the preceding tunnel and the succeeding tunnel constructed next to it,
A seal member extending along the propulsion direction of the trailing tunnel,
The seal member includes a base portion fixed to the following tunnel, and a lip portion that rises obliquely from the base portion toward the preceding tunnel,
On the surface of the lip portion facing the preceding tunnel, a protrusion is formed along the extending direction of the seal member,
The trailing tunnel is formed with a seal accommodation groove for accommodating the seal member,
The protrusion is formed on the surface of the base end portion connected to the base portion of the lip portion,
The surface of the base end portion is located inside the seal housing groove, and the ridge formed on the surface of the base end portion protrudes from the opening end of the seal housing groove toward the preceding tunnel. Sealing structure between tunnels. The inter-tunnel seal structure according to claim 1, wherein the protrusion is formed at a distal end portion of the lip portion.

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