JP2007023541A - Water cut-off structure of segment for shield tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent flood from a natural ground side from diffusing along each joint part. <P>SOLUTION: This water cut-off structure of the segment for the shield tunnel constituted by sticking belt-like sealing materials 15, 16 having elasticity and being a pair on an outer side face 13 by arranging them substantially in parallel for each other is provided with connection sealing materials 23, 24 stuck to the outer side face 13 and having water expansion property over each belt-like sealing material 15, 16 to cross for the longitudinal direction of each belt-like sealing material 15, 16. Channel parts 21, 22 to which the connection sealing materials 23, 24 are stuck are formed on the outer side face 13. Two adjacent faces 3a, 3c which become both sides of a corner part 20 are provided as the outer side face 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a waterproof structure for a shield tunnel segment provided with a sealing material for waterproofing a joint which is a joint for a segment which is a member for civil engineering work used when constructing a tunnel.

  For example, as a construction material for a shield tunnel excavated underground such as an urban area or a shield tunnel for constructing a deep tunnel, a number of unitized segments 1 as shown in FIG. 12 are used. In the tunnel construction, each of these segments 1 is closely connected and coupled along both directions of the peripheral wall a of the tunnel and the length direction b of the tunnel. Each segment 1 penetrates through the mounting recess 2 formed in the segment inner surface 1a side through the front and rear ring surfaces 3a, 3b along the circumference and the upper and lower piece surfaces 3c, 3d along the length direction. When the fixing hole 4 is drilled and these surfaces become opposing surfaces, and the segments 1 are connected and joined together, the coupling bolts that penetrate the fixing holes 4 through the ring surfaces adjacent to each other and the piece surfaces are connected to each other. Fasten with (not shown) and join. In addition to the method of connecting with such a connecting bolt, a structure in which tenons are formed on the piece surfaces 3c and 3d to connect each other, or a pin connection structure (horizontal cotter connection structure) for fastening with a cotter pin, etc. The segments are linked together.

  Here, in order to prevent the spring water from the ground of the mine shaft from leaking into the mine shaft, the water between the ring surfaces 3a, 3b and between the piece surfaces 3c, 3d of each segment 1 It must be treated. Therefore, as shown in FIG. 9, belt-shaped joint sealing materials 5 and 6 are bonded and fixed to the joint. The joint sealing materials 5 and 6 are made of a water-swellable material, for example, a material obtained by mixing and vulcanizing a high-absorbency resin and synthetic rubber, and the ring surfaces 3a and 3b and the piece 3c of the segment 1 are used. , 3d surfaces are affixed with the joint sealing materials 5 and 6 and the segments 1 are joined to prevent water from entering the joints.

  In the seal structure of the segment using the joint seal materials 5 and 6 described above, two joint seal materials on the ground surface side and the inside of the mine shaft are used on each surface, and they are adhered to each surface in parallel with each other. These sealing materials 5 and 6 are formed in a long strip shape, and are formed into an endless annular shape so that the end portions are not formed after the completion of sticking, that is, a double water-stop structure. Moreover, in the state which connected the segment 1, each joint sealing material 5 and 6 will become an opposing position, respectively, and it will also prevent the uneven load at the time of the connection of the segments 1.

  However, as the joint part of the segment, double sealing materials 5 and 6 are provided, and it is configured to obtain a sufficient water stop performance against leakage from the natural ground side. There may be cases where there are defective sticking of the sealing materials 5, 6, molding defects of the sealing materials 5, 6 and defects in the sealing materials 5, 6, etc. It may end up. Normally, even if the ground seal material 5 has such inundation, the mine inner side seal material 6 prevents the water from entering the mine shaft and is transmitted between both the seal materials 5 and 6, and drains on the side of the tunnel. Led to the department. However, between the sealing materials 5 and 6, the tunnel is gradually transmitted to the plurality of segments in the longitudinal direction of the tunnel (the length direction b of the tunnel), and the same problem as described above occurs in the tunnel inner side sealing material 6 at any position. In some cases, inundation occurs inside the tunnel. Such flooding reduces the appearance inside the tunnel, and may cause a decrease in durability as a tunnel wall surface.

  The present invention has been made in view of the above circumstances, and prevents the inundation from the natural ground side from spreading through each surface of the segment and spreading to each joint portion. It aims at obtaining the water stop structure of the segment for shield tunnels which can prevent inundation from the material into the tunnel.

Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments.
According to the water-stopping structure of the shield tunnel segment according to the first aspect of the present invention, the shield tunnel for the shield tunnel in which at least the pair of elastic strip-like seal materials 15 and 16 are adhered to the outer surface 13 so as to be substantially parallel to each other. The water stop structure of the segment,
The belt-shaped sealing materials 15 and 16 are provided with connecting sealing materials 23 and 24 having elasticity, which are adhered to the outer surface 13 across the belt-shaped sealing materials 15 and 16 so as to intersect with the longitudinal direction of the belt-shaped sealing materials 15 and 16. .

  According to the water blocking structure of the shield tunnel segment, the connecting seal materials 23 and 24 extend over the ground-side belt-like seal material 15 affixed to the outer surface 13 of the segment 11 and the belt-like seal material 16 inside the tunnel. Since it is disposed, even if the inundation prevention effect by each strip-shaped sealing material 15, 16 is lowered due to some trouble, the intruding water that moves between each strip-shaped sealing material 15, 16 is blocked on the way It becomes possible to do. Thereby, the intrusion water which diffuses in the joint part between each segment 11 stays at the minimum, and the water leakage into the tunnel is prevented.

The sealed water structure of the shield tunnel segment according to claim 2, wherein at least a pair of elastic strip-like sealing materials 15, 16 are attached to the outer surface 13 so as to be substantially parallel to each other. Because
The coupling seals 23 and 25 having elasticity are attached to the outer surface 13 across the strip seals 15 and 16 so as to cross the longitudinal direction of the strip seals 15 and 16, and the coupling seals. Grooves 21 and 22 to which the materials 23 and 24 are attached are formed on the outer surface 13.

  According to the water blocking structure of the shield tunnel segment, the connecting seal materials 23 and 24 extend over the ground-side belt-like seal material 15 affixed to the outer surface 13 of the segment 11 and the belt-like seal material 16 inside the tunnel. Since it is disposed, even if the inundation prevention effect by each strip-shaped sealing material 15, 16 is lowered due to some trouble, the intruding water that moves between each strip-shaped sealing material 15, 16 is blocked on the way It becomes possible to do. As a result, inundation that diffuses at the joints between the segments 11 is kept to a minimum, and water leakage into the tunnel is prevented. In addition, since the positions where the connecting sealing materials 23 and 24 are pasted are the positions of the grooves 21 and 22 formed on the outer side surface 13, the pasting positions can be set in advance and the pasting work can be easily performed.

  The water stop structure of the shield tunnel segment according to claim 3 is characterized in that the connecting sealing materials 23 and 24 are disposed on at least one side surface of the outer side surface 13.

  According to the water blocking structure of the shield tunnel segment, since it is disposed so as to cross both the strip-shaped sealing materials 15 and 16 on one side surface where the connecting sealing materials 23 and 24 are provided, Even if the water is transmitted to the water, the passage of water is prevented at the positions of the connecting sealing materials 23 and 24.

  In the water shutoff structure for the shield tunnel segment according to claim 4, the connecting sealing materials 23 and 24 are respectively arranged on the two adjacent surfaces 3 a and 3 c (3 b and 3 d) on both sides of the corner portion 20 on the outer surface 13. It is characterized by being.

  According to the water blocking structure of the shield tunnel segment, the two side seals 15 and 16 are disposed so as to cross both the strip seals 15 and 16 on the two side surfaces where the connecting seals 23 and 24 are provided. Even if the intrusion water is transmitted in the meantime, the intrusion water is blocked at the positions of the connecting sealing materials 23 and 24, and this increase in water flow can be prevented.

  The waterproof structure of the shield tunnel segment according to claim 5 is characterized in that the connecting sealing material 23 is disposed at the corner portion 20 on the outer surface.

  According to the water blocking structure of the shield tunnel segment, since the strips 15 and 16 are disposed across the belt-like seal materials 15 and 16 at the corner portion 20 on the outer surface 13 where the connecting seal material 23 is provided, the double-band seals are provided. Even if water is transmitted between the materials 15 and 16, water is prevented from passing through the corner portion 20 of the segment 11, which is the position of the connecting seal material 23, thereby minimizing the diffusion of the water.

  The waterproof structure of the shield tunnel segment according to claim 6 is characterized in that the connecting seal materials 23 and 24 include a water expansion layer made of a material having water expandability.

  According to the water blocking structure of the shield tunnel segment, when there is intrusion water between the belt-like seal materials 15 and 16, the connection seal materials 23 and 24 absorb and expand at the positions of the connection seal materials 23 and 24. Wake up and stop water.

  The waterproof structure of the shield tunnel segment according to claim 7 is characterized in that the connecting sealing materials 23 and 24 are made of a material having water expandability.

  According to the water blocking structure of the shield tunnel segment, when there is intrusion water between the belt-like seal materials 15 and 16, the connection seal materials 23 and 24 absorb and expand at the positions of the connection seal materials 23 and 24. Wake up and stop water.

  In the water-stopping structure of the shield tunnel segment according to the first aspect of the present invention, the connecting sealing material is disposed across the ground-side belt-like sealing material affixed to the outer side surface of the segment and the belt-like sealing material inside the mine shaft. Therefore, even when the inundation preventing effect of each strip-shaped sealing material has been reduced due to some problem, it is possible to prevent inundation that moves between the strip-shaped sealing materials in the middle between the segments. . As a result, inundation that diffuses at the joints between the segments is kept to a minimum, and leakage into the mine shaft is prevented. In addition, the inner surface of the tunnel is not deteriorated in appearance due to flooding, and the tunnel strength and durability due to the flooding can be improved.

  In the water blocking structure of the shield tunnel segment according to the second aspect of the present invention, the connecting sealing material is disposed across the ground-side belt-like sealing material adhered to the outer surface of the segment and the belt-like sealing material inside the mine shaft. Therefore, even if the effect of preventing water infiltration by each strip-shaped sealing material has been reduced due to some problem, it is possible to prevent the water that travels between the respective strip-shaped sealing materials from moving along the way. As a result, inundation that diffuses at the joints between the segments is kept to a minimum, and leakage into the mine shaft is prevented. In addition, since the position where the connecting sealing material is applied is the position of the groove formed on the outer surface, the attaching position can be set in advance and the attaching operation can be facilitated.

  Since the water blocking structure for the shield tunnel segment according to the third aspect of the present invention is arranged so as to cross both the band-shaped sealing materials on one side surface where the connecting sealing material is provided, water is transmitted between the two band-shaped sealing materials. However, water passage is prevented at the position of the connecting sealing material.

  Since the water blocking structure for the shield tunnel segment according to the fourth aspect of the present invention is arranged so as to cross both the strip-shaped sealing materials on the two side surfaces where the connecting sealing material is provided, the ingress water is interposed between the two strip-shaped sealing materials. Even if it is transmitted, the intrusion water is blocked at the position of the connecting sealing material, and the expansion of the water flow can be prevented.

  Since the water blocking structure for the shield tunnel segment according to the fifth aspect of the present invention is arranged so as to cross both the band-shaped sealing materials at the corner portion on the outer surface where the connecting sealing material is provided, the both-band-shaped sealing material Even if the water is transmitted in the meantime, the water is prevented from passing through the corner portion of the segment which is the position of the connecting seal material, and the diffusion of the water is minimized.

  According to a sixth aspect of the present invention, there is provided the water blocking structure for the shield tunnel segment. When there is intrusion water between the two strip-shaped sealing materials, the coupling sealing material causes water absorption and expansion at the position of the coupling sealing material. The water will be stopped.

  The water stop structure of the shield tunnel segment according to claim 7 of the present invention is such that when there is intrusion water between the belt-like seal materials, the connection seal material causes water absorption expansion at the position of the connection seal material, thereby The water will be stopped.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a water stop structure for a shield tunnel segment according to the invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a segment having a water blocking structure for a shield tunnel segment according to the present invention, and FIG.
As described above, the segment 11 is a curved, substantially rectangular plate-like member, and the mounting recess 12 is provided in the vicinity of the periphery of the inner surface 11 a, and the fixing hole 14 that penetrates the mounting recess 12 and the outer surface 13 is provided. . The outer side surface 13 is composed of front and rear ring surfaces 13a and 13b along the circumference of the peripheral wall and upper and lower piece surfaces 13c and 13d along the length direction, and each surface 13a, 13b, 13c and 13d has a pair of The concave grooves 17 and 18 are formed continuously.

  Grooves 21 and 22 are formed in the ring surface 3a and the piece surface 3c, which are adjacent two surfaces sandwiching the corner portion 20 on the outer surface 13 of the segment 11, respectively. These groove portions 21 and 22 intersect with each of the pair of concave grooves 17 and 18 and are in communication with both concave grooves 17 and 18, and are formed shallower than the respective concave grooves 17 and 18. As shown in FIG. 1, it is formed in a rectangular shape. In the present embodiment, the groove portion 21 of the ring surface 3a is positioned slightly adjacent to the corner portion 20 of the ring surface 3a, and the groove portion 22 of the piece surface 3c is positioned at the approximate center of the piece surface 3c.

  On the outer surface 13 of the segment 11, elastic band-shaped sealing materials 15 and 16 are attached so as to form a continuous ring shape. The belt-like sealing material is constituted by a ground-side sealing material 15 and a mine-side sealing material 16 as a pair, and the ground-side sealing material 15 is formed in a concave groove 17 on the outer surface 13 on the ground-side side in the mine-side sealing material 16. Are affixed to the groove 18 on the mine shaft side. These sealing materials 17 and 18 are made of synthetic rubber such as chloroprene rubber, ethylene-propylene-diene rubber, styrene-butadiene rubber, or natural rubber, and water such as acrylic acid, urethane, and isobutylene-maleic anhydride. A composition containing an expandable resin, an inorganic filler, and a vulcanizing agent is extruded into a predetermined cross-sectional shape such as a substantially trapezoidal shape. The bottom surfaces of the sealing materials 17 and 18 are adhesive surfaces.

  In addition, connection sealing materials 23 and 24 are respectively attached to the grooves 21 and 22 formed on the outer surface 13. In the present embodiment, these coupling seal materials 23 and 24 are rectangular strips having a substantially uniform thickness, and are made of natural rubber, urethane rubber, chloroprene rubber, butyl rubber, or the like. Preferably, a water-swellable material, for example, a superabsorbent resin and a synthetic rubber are mixed and vulcanized so as to include a raw material portion. In a state where the connecting sealing materials 23 and 24 are attached to the groove portions 21 and 22, the connecting sealing materials 23 and 24 cover a part of each of the belt-shaped sealing materials 15 and 16 described above, and the longitudinal direction of the belt-shaped sealing materials 15 and 16. Are arranged over the belt-like sealing materials 15 and 16 so as to cross each other.

  And when each surface 13a-13d becomes an opposing surface and the segment 1 is connected and connected, ie, in tunnel construction, the ring surfaces adjacent to each other and the piece surfaces are connected through the fixing hole 14. The bolts (not shown) are fastened and joined together, and are tightly joined and joined along both the circumference a of the tunnel and the length direction b of the tunnel (see FIG. 9). In this state, the strip-shaped sealing materials 15 and 16 are compressed and deformed, and the connecting sealing materials 23 and 24 are sandwiched between the strip-shaped sealing materials (see FIG. 4).

  Therefore, in the water blocking structure of the shield tunnel segment, when there is spring water from the natural mountain side, inundation is prevented by the belt-shaped sealing materials 15 and 16 in the joint portion between the segments 11. Each strip-shaped sealing material 15 and 16 absorbs water and expands so that no gap is generated at the joint.

  Here, when the natural ground side sealing material 15 becomes inundated due to a chipping or poor adhesion, the natural ground side sealing material 15 enters between the natural ground side sealing material 15 and the mine shaft side sealing material 16, and is transmitted through this gap portion. Although it flows between the segments 11, the outer surface 13 of the segment 11 is provided with connecting sealing materials 23 and 24 that are positioned so as to intersect with the longitudinal direction of the strip-shaped sealing materials 15 and 16, respectively. Intrusion water is blocked at the positions of the connecting sealing materials 23 and 24. The coupling sealing materials 23 and 24 absorb and expand in the grooves 21 and 22 due to the intrusion water, fill the gaps between the segments 11 as shown in FIG. 4, and are strip-shaped sealing materials 15 and 16 which are the longitudinal direction of the outer surface 13. Stop water in the direction of application.

  In the present embodiment, the connecting seal members 23 and 24 are provided on the ring surface 3a and the piece surface 3c adjacent to each other on the outer side surface 13, and as shown in FIG. In FIG. 2, the connecting sealing materials 23 and 24 are located respectively. As a result, as shown by the broken line in the figure, the infiltrated water from the place where the inundation occurred (indicated by x in the figure) is surrounded by the respective sealing materials 15, 16, 23, and 24, and a pair of strip-shaped seals. It does not spread along the materials 15 and 16.

  In the above-described embodiment, the connecting sealing materials 23 and 24 are affixed to the adjacent ring surface 3a and piece surface 3c sandwiching the corner portion 20, and provided in each segment 11, as shown in FIG. Although it is configured so as to be positioned between the segments, a connecting sealing material may be provided at the corner portion 20 of the segment 11 as shown in FIG. By adopting such a configuration, each segment 11 may be provided with a connecting sealing material 23 at one corner portion 20, and the water stop performance at the bent portions of the band-shaped sealing materials 15 and 16 to be adhered is improved. In addition, the arrangement work can be simplified and the cost can be reduced.

  Further, as shown in FIGS. 7 and 8, a connection sealing material may be provided on any one side surface of the outer surface 13 of the segment 11. According to this configuration, as indicated by the broken line in the figure, the infiltration water flows only in the direction a around the peripheral wall of the mine shaft of the segment 11 or only in the length direction b of the mine shaft, and flows into the joint portions of all the segments 11. Infiltration water can be guided to the side of the tunnel without being diffused.

  Furthermore, in the above-described embodiment, an example in which one connection sealing material is provided on each of the ring surface and the piece surface on the outer surface of the segment 11 is described. However, a plurality of connection sealing materials are provided on each surface. It is good. In that case, the diffusion of the intrusion water is further prevented.

  In the above-described embodiment, the connection sealing materials 23 and 24 are provided in each segment 11. However, the connection seal members 23 and 24 may not be provided in all the segments 11 constituting the tunnel. It may be configured as an example in which the units are provided in units and are connected intermittently, or every other segment 11 or in a staggered arrangement.

  Further, in the above-described embodiment, the example has been described in which the groove portions 21 and 22 to which the coupling seal materials 23 and 24 are attached are formed on the respective surfaces 3a to 3d of the segment 11, but the groove portions 21 and 22 are not formed. It is good also as comprising. That is, as shown in FIG. 9, concave grooves 17 and 18 are formed on each surface of the segment 11, and strip-shaped sealing materials 15 and 16 are attached to the concave grooves 17 and 18, respectively. The connecting sealing materials 23 and 24 are arranged at arbitrary positions so as to cover a part of 15 and 16. By setting it as such a structure, without restrict | limiting the position where the connection sealing materials 23 and 24 are affixed, it arrange | positions suitably and arbitrary numbers with respect to the segment 11 in a required location. It becomes possible.

  Further, in the above-described embodiment, an example in which the shape of the connecting sealing materials 23 and 24 is a rectangular strip-like sheet shape has been shown. However, as shown in FIGS. For example, it is good also as comprising with members with predetermined thickness, such as the cross-sectional shape of the strip | belt-shaped sealing materials 15 and 16, and substantially the same shape. In the case of the connecting sealing materials 23 and 24, the connecting sealing materials 23 and 24 are configured to have a length substantially equal to the interval width length of the belt-shaped sealing materials 15 and 16, and preferably have both ends in contact with the belt-shaped sealing materials 15 and 16. . Further, as the material of the connecting sealing materials 23 and 24, as described above, natural rubber, urethane rubber, chloroprene rubber, butyl rubber or the like is preferably used, preferably a water-swellable material such as a highly absorbent resin. And a raw material portion formed by synthetic molding and vulcanization. Also in the connection sealing materials 23 and 24 having such a shape, as described above, the grooves 3 are not formed on the respective surfaces 3a to 3d of the segment 11 to which the connection sealing materials 23 and 24 are attached as shown in FIG. It is good also as a structure, and it is good also as a structure which forms the groove parts 21 and 22 as shown in FIG. In the case of the configuration in which the groove portions 21 and 22 are formed (see FIG. 11), the depth of the groove portions 21 and 22 is set to the same depth as the concave grooves 17 and 18 for attaching the strip-shaped sealing materials 15 and 16. Thus, the shape of the connecting sealing materials 23 and 24 can be made equal to the shape of the strip-shaped sealing materials 15 and 16, that is, the connecting sealing materials 23 and 24 and the strip-shaped sealing materials 15 and 16 can be configured by the same thing. Become.

  Further, in the above-described embodiment, the example in which the connecting structures of the segments 11 are connected to each other using the connecting bolts has been described. However, the pieces 11 are fitted to the piece surfaces 13c and 13d of the segments 11. The segments 11 are connected to each other by a structure (not shown) in which tenons are joined and connected to each other, or a horizontal cotter connection structure (not shown) as a pin connection structure to be fastened using a cotter pin. Also good.

The perspective view which shows the water stop structure of the segment for shield tunnels concerning this invention Cross section of the water stop structure Exploded sectional view of the water stop structure Sectional drawing which shows the segment connection state using the water stop structure Schematic explanatory diagram showing the water stop state in the water stop structure Schematic explanatory drawing which shows the water stop structure of other embodiment Schematic explanatory drawing which shows the water stop structure of other embodiment Schematic explanatory drawing which shows the water stop structure of other embodiment Schematic explanatory drawing which shows the water stop structure of other embodiment Schematic explanatory drawing which shows the water stop structure of other embodiment Schematic explanatory drawing which shows the water stop structure of other embodiment The perspective view which shows the general structure of the water stop structure of a conventional segment, and a tunnel

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Segment 13 ... Outer peripheral surface 15, 16 ... Strip | belt-shaped sealing material 20 ... Corner part 21,22 ... Groove part 23, 24 ... Connection sealing material

Claims (7)

A waterproof structure for a shield tunnel segment in which at least a pair of elastic strip-shaped sealing materials are attached to the outer surface so that they are substantially parallel to each other,
A waterproof structure for a shield tunnel segment, comprising: a connecting sealing material having elasticity that is adhered to the outer surface across each belt-shaped sealing material so as to cross the longitudinal direction of each belt-shaped sealing material. A waterproof structure for a shield tunnel segment in which at least a pair of elastic strip-shaped sealing materials are attached to the outer surface so that they are substantially parallel to each other,
Each of the strip-shaped sealing materials includes an elastic coupling seal material that is adhered to the outer surface across the strip-shaped sealing materials so as to intersect with each other, and the groove portion to which the coupling sealing material is adhered has the outer portion. A waterproof structure for a shield tunnel segment, characterized by being formed on a side surface.   3. The water stop structure for a shield tunnel segment according to claim 1, wherein the connecting sealing material is disposed on at least one side surface of the outer side surface.   3. The water stop structure for a shield tunnel segment according to claim 1, wherein the connecting sealing material is disposed on two adjacent surfaces on both sides of the corner portion on the outer surface.   The waterproof structure for a shield tunnel segment according to claim 1 or 2, wherein the connecting sealing material is disposed at a corner portion on the outer surface.   The said connection sealing material is equipped with the water expansion layer which consists of a raw material which has a water expansibility, The water stop of the segment for shield tunnels as described in any one of Claim 1, 2, 3, 4, 5 characterized by the above-mentioned. Construction.   The shield structure for a shield tunnel segment according to any one of claims 1, 2, 3, 4, and 5, wherein the connecting sealing material is made of a material having water expandability.

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