JP2007291753A - Sealant for segment, and tunnel structure equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealant for a segment, superior in cut-off properties and heat resistance, and a tunnel structure equipped with the sealant. <P>SOLUTION: The sealant 2 for the segment, which is provided between end surfaces 1a of mutually adjacent segments 1 among a plurality of segments 1 for covering an excavated surface T1 of a tunnel T, so as to prevent the leakage of water from between the end surfaces 1a of the segments 1, is formed by mixing a water-absorbing polymer into a silicon rubber 2a. The sealant 2 is formed by providing the silicon rubber 2a in a state in which the water-absorbing polymer is mixed into a chloroprene rubber 2b and in which an outer surface of a part of the chloroprene rubber 2b is exposed to the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a segment sealing material that is provided between the end surfaces of adjacent segments of a plurality of segments that cover the excavation surface of a tunnel excavated by a shield machine, for example, and prevents leakage of water from between the end surfaces of the segments. It relates to the tunnel structure.

  Conventionally, for example, a tunnel excavation surface excavated by a shield method or the like is provided with a plurality of arc-shaped segments having a curvature radius substantially equal to the curvature radius of the excavation surface in the circumferential direction, and the circumferential excavation surface An annular segment ring body that covers and supports is formed. And the segment ring body which supports such a circumferential excavation surface is connected so that it may continue in a tunnel axial direction, and the tunnel lining which covers and supports an excavation surface is formed. In addition, for this type of segment, generally, a steel segment, a concrete segment, or a composite segment obtained by combining these steel and concrete is used, and adjacent segments are integrally joined to each other. In addition, a sealing material (segment sealing material) is interposed between the end surfaces of the adjacent segments so that groundwater does not enter from the ground (the excavation surface side) and water leakage occurs in the tunnel. This type of sealing material uses resin (polymer) -based materials such as a water-expandable rubber-based sealing material that swells when groundwater comes into contact and fills the gaps between the end faces of the segments to stop water leakage. (For example, refer to Patent Document 1).

Also, especially in road tunnels and railway tunnels, when a tunnel fire occurs, a fireproof layer (fireproof panel) is provided on the inner part of the tunnel so that the segment is not damaged by the heat from the fire, and fire resistance is given. (For example, see Patent Document 2 and Patent Document 3).
JP 2005-264466 A JP 2004-323330 A JP 2001-311395 A

  However, while the segment covering the tunnel excavation surface has the above-mentioned fireproof layer and has resistance to fire, the rubber-based sealing material disposed between the end surfaces of the segments has a heat resistant temperature of about 120 ° C., for example. Yes, it is damaged by the heat generated by the tunnel fire. For this reason, the seal material that has received a fire has a reduced required water-stopping performance and is difficult to replace because it is interposed between a number of segments that support the tunnel excavation surface. There was a problem that it was not possible to stop the leakage of water into the inside, and a great deal of labor was required such as requiring other measures against water leakage.

  In view of the above circumstances, an object of the present invention is to provide a segment sealing material excellent in water-stopping and heat resistance and a tunnel structure including the same.

  In order to achieve the above object, the present invention provides the following means.

  The segment seal material of the present invention is a segment seal material provided between end surfaces of adjacent segments of a plurality of segments covering a tunnel excavation surface, and for preventing water leakage from between the end surfaces of the segments. It is characterized by comprising silicon rubber and a water-absorbing polymer.

  In the segment sealing material of the present invention, it is desirable that the water-absorbing polymer is mixed in the silicon rubber.

  Further, in the segment sealing material of the present invention, the silicone rubber is provided so as to cover the outer surface of the chloroprene rubber with the outer surface of a part of the chloroprene rubber mixed with the water-absorbing polymer being exposed to the outside. It may be done.

  Further, in the segment sealing material of the present invention, the silicon rubber is formed in a substantially cylindrical shape and has a through hole that penetrates from the outer surface to the inner surface to communicate the hollow portion with the outside. More preferably, the water-absorbing polymer or chloroprene rubber mixed with the water-absorbing polymer is provided.

  Furthermore, in the segment sealing material of the present invention, it is further preferable that a water guide material for guiding the external water into the hollow portion is provided in the through hole of the silicon rubber.

  The tunnel structure of the present invention is a tunnel structure provided with a plurality of segments covering the excavation surface of the tunnel, and a segment sealing material provided between the end surfaces of the adjacent segments to prevent water leakage between the end surfaces of the segments. The segment sealing material is formed of silicon rubber and a water-absorbing polymer.

  In the tunnel structure of the present invention, it is preferable that the segment sealing material is formed by mixing the water-absorbing polymer into the silicon rubber.

  Furthermore, in the tunnel structure of the present invention, the segment seal material covers the outer surface of the chloroprene rubber in a state where the outer surface of the chloroprene rubber mixed with the water-absorbing polymer is exposed to the outside. More preferably, the outer surface of the chloroprene rubber exposed to the excavation surface side is more preferably provided.

  Further, in the tunnel structure of the present invention, the segment sealing material includes the silicon rubber formed in a substantially cylindrical shape, and has a through hole that penetrates from the outer surface to the inner surface to communicate the hollow portion with the outside, and the water-absorbing polymer Alternatively, it is desirable that the chloroprene rubber mixed with the water-absorbing polymer is provided in the hollow portion, and the opening side of the through hole is disposed with the excavation surface side facing.

  Furthermore, in the tunnel structure of the present invention, it is more desirable that a through-hole of the silicon rubber is provided with a water guide material that guides the external water into the hollow portion.

  In the tunnel structure of the present invention, the segment is a concrete segment or a composite segment in which steel and concrete are combined, and the concrete of the segment has a water cement ratio of 40% or less and 0.05 volume of organic fiber. It is more desirable that it is formed by mixing in an amount of from 0.3 to 0.3% by volume.

  According to the segment sealing material and the tunnel structure provided with the same according to the present invention, since the segment sealing material includes the silicon rubber and the water-absorbing polymer, the groundwater that has entered between the end surfaces of the adjacent segments from the excavation surface side. The water-absorbing polymer absorbs water while coming into contact with the water-absorbing polymer, and the segment sealing material can be expanded as the water-absorbing polymer absorbs water. Thereby, the clearance gap between the end surfaces of an adjacent segment can be reliably interrupted | blocked with the segment sealing material, and generation | occurrence | production of water leakage can be prevented reliably. In addition, even when the segment seal material is heated by a tunnel fire, the water-absorbing polymer absorbs the groundwater and retains it, so that the segment seal material can be maintained at a low temperature and damaged by heating. Can be prevented. Thereby, water leakage can be stopped reliably even after a fire.

  In the segment sealing material and the tunnel structure of the present invention, the water-absorbing polymer is mixed in the silicon rubber, so that the segment sealing material can be provided with water-stopping property and fire resistance.

  Furthermore, silicon rubber is provided in a state where a part of the outer surface of the chloroprene rubber mixed with the water-absorbing polymer is exposed to form a sealing material for the segment, and the exposed outer surface of the chloroprene rubber is provided facing the excavation surface side. Therefore, the groundwater can be reliably brought into contact with the water-absorbing polymer. Thereby, the said effect can be acquired reliably.

  In addition, the silicon rubber has a hollow portion and a through hole, and the hollow portion is provided with a water-absorbing polymer or a chloroprene rubber mixed with a water-absorbing polymer. Is installed, the groundwater can be brought into contact with the water-absorbing polymer through the through hole. Furthermore, by providing a water guiding material in the through hole, the water-absorbing polymer can reliably absorb the groundwater. Thereby, the said effect can be acquired.

  Furthermore, the concrete segment or the concrete of the synthetic segment is heated by being mixed with 0.05 to 0.3 volume% of organic fiber with a water cement ratio of 40% or less. When this occurs, the organic fibers create fine voids in the concrete, and these voids can relieve the thermal expansion force of the concrete surface layer and the pressure of the gas expanded inside, thereby preventing the separation and scattering of the concrete surface layer. . Thereby, even if it does not equip a part inside a tunnel with a fireproof panel, fire resistance can be provided to a segment with the sealing material for segments, and it becomes possible to provide the tunnel structure excellent in fire resistance.

  Hereinafter, with reference to FIG.1 and FIG.2, the segment sealing material which concerns on 1st Embodiment of this invention, and a tunnel structure provided with the same are demonstrated. The present embodiment relates to a segment sealing material that is disposed between end faces of adjacent segments of a road tunnel constructed by, for example, a shield method and the like, and a tunnel structure including the same.

  The tunnel structure A of the present embodiment includes a plurality of segments 1 and a segment seal material (seal material) 2 attached to the segment 1. As shown in FIG. 1, each segment 1 is formed in an arcuate disk shape having a curvature radius substantially equal to the curvature radius of the excavation surface T1 of the tunnel T excavated by the shield machine. Further, the segment 1 is formed such that the circumferential length in the circumferential direction is larger than the width in the axis O1 direction of the segment 1 parallel to the tunnel axis O2 in the installed state, and the radial thickness is along the circumferential direction. It is formed uniformly. The plurality of segments 1 formed in this way are continuously provided in the circumferential direction of the tunnel T along the excavation surface T1 of the tunnel T, and are annular segments supported while covering the circumferential excavation surface T1. A ring body 3 is formed. In addition, the segment ring body 3 is continuously adjacent to the tunnel O in the direction of the axis O2, and the excavation surface T1 excavated by the shield machine is supported while being covered with the plurality of segments 1, thereby forming the lining of the tunnel T. The In addition, each segment 1 is mutually joined by the joint between rings and the joint between segments which are not shown in figure.

  Moreover, as shown in FIG.1 and FIG.2, the recessed part 1b dented inside is formed in the joining end surface (end surface) 1a of adjacent segments 1 in the segment 1 of this embodiment. Two recesses 1b are provided on each end face 1a of the segment 1 and extend in parallel from one end to the other end along the extending direction of each end face 1a. Moreover, the recessed part 1b is formed so that the recessed part 1b of one segment 1 and the recessed part 1b of the other segment 1 face each other in a state where end surfaces 1a of adjacent segments 1 are joined to each other.

  The segment 1 of the present embodiment formed as described above is a concrete segment or a composite segment in which steel and concrete are combined. Further, the concrete of segment 1 is mixed with 0.05% to 0.3% by volume of organic fiber such as polyacetal or polypropylene having a water cement ratio of 40% or less and a diameter of 10 to 200 μm and a length of 1 to 20 mm, for example. Is formed. The segment 1 provided with such concrete, as described in, for example, Japanese Patent Application Laid-Open No. 2004-323330, when heated by a fire, the organic fibers are decomposed to form fine voids in the concrete. The air gap relaxes the thermal expansion force of the concrete surface layer and the pressure of the gas expanded inside, thereby preventing the separation and scattering of the concrete surface layer. Thereby, the segment 1 provided with such concrete is excellent in fire resistance, and imparts excellent fire resistance to the tunnel structure of the present embodiment having the same.

  On the other hand, as shown in FIG. 2, the sealing material 2 of this embodiment is composed of a silicon rubber 2a formed in an L-shaped cross section and a chloroprene rubber 2b having a rectangular cross section fixed to the silicon rubber 2a. The rubber 2a and the chloroprene rubber 2b are integrally formed so as to exhibit a rectangular cross section. Further, the chloroprene rubber 2b is mixed with a water-absorbing polymer, and the two outer surfaces 2c and 2d are fixedly covered with the L-shaped inner surface of the silicon rubber 2a in a sectional view, and the remaining two outer surfaces 2e, 2f is exposed to the outside.

  As shown in FIGS. 1 and 2, the sealing material 2 formed in this way has the two exposed outer surfaces 2e and 2f of the chloroprene rubber 2b of the segment 1 adjacent to the excavation surface T1 side of the tunnel T. It is installed in each recess 1b of the segment 1 in a state of being directed to the end face 1a side. The sealing material 2 is provided so as to slightly protrude from the recess 1b toward the end surface 1a side of the adjacent segment 1, and from one end along the recess 1b, that is, along the extending direction of each end surface 1a of the segment 1. It extends to the other end. And while adjoining the adjacent segments 1, the exposed outer surfaces 2f of the chloroprene rubber 2b of the sealing material 2 facing each other are in close contact with each other, and a pair of sealing materials 2 are interposed between the end surfaces 1a of the adjacent segments 1. The Thereby, between the end surface 1a of the adjacent segment 1 is interrupted | blocked by a pair of sealing material 2. FIG. Further, at this time, the outer surface 2e of the chloroprene rubber 2b facing the excavation surface T1 side of the tunnel T of the pair of sealing materials 2 is flush with the surface.

  Next, functions and effects of the segment sealing material 2 having the above-described configuration and the tunnel structure A including the same will be described.

  When ground water enters from the excavation surface T1 side in the state where the segments 1 are joined to each other and the sealing material 2 facing each other is interposed between the end surfaces 1a of the segment 1, the chloroprene rubber 2b exposed to the excavation surface T1 side The ground water comes into contact with the outer surface 2e. Then, the water-absorbing polymer mixed in the chloroprene rubber 2b absorbs the groundwater and expands, and accordingly, the chloroprene rubber 2b expands and the pair of sealing materials 2 adheres more firmly. Thereby, a pair of sealing materials 2 will interrupt | block reliably between the end surfaces 1a of the adjacent segment 1, and a water leak does not arise inside the tunnel T. FIG.

  On the other hand, when a fire occurs in the tunnel T, the segment 1 and the sealing material 2 are heated. In the present embodiment, as described above, the water-cement ratio is 40% or less and the organic fiber is used. Since the segment 1 is formed with the concrete mixed with 0.05% by volume to 0.3% by volume of concrete, peeling and scattering of the concrete surface layer are prevented, and the segment 1 is not damaged. Moreover, since the water-absorbing polymer mixed in the chloroprene rubber 2b absorbs and retains groundwater, the sealing material 2 of this embodiment maintains its temperature at a low temperature even when receiving heat during a fire. Is done. For this reason, the sealing material 2 is not damaged by the heating at the time of the fire, and the sealing material 2 after the fire maintains its water stopping performance in a state before the fire and prevents the occurrence of water leakage.

  Therefore, according to the segment sealing material 2 and the tunnel structure A of the present embodiment, the water-absorbing polymer absorbs groundwater and expands, so that the end surfaces 1a of the adjacent segments 1 can be reliably blocked. As a result, it is possible to reliably prevent the occurrence of water leakage. Further, even when the segment sealing material 2 is heated by a tunnel fire, the water-absorbing polymer absorbs groundwater and retains the water, so that the segment sealing material 2 can be maintained at a low temperature, Can prevent damage. Thereby, water leakage can be stopped reliably even after a fire.

  In addition, by installing the segment sealing material 2 with the exposed outer surface 2e of the chloroprene rubber 2b mixed with the water-absorbing polymer facing the excavation surface T1, the groundwater can be reliably brought into contact with the water-absorbing polymer. Aqueous and heat resistance can be reliably obtained.

  Furthermore, in the tunnel structure A of the present embodiment, the concrete of the segment 1 is formed by mixing the water-cement ratio to 40% or less and mixing 0.05% to 0.3% by volume of organic fibers. The segment 1 can be provided with excellent fire resistance, and the tunnel structure A having excellent fire resistance can be constructed by including the segment 1 and the segment sealing material 2 described above. .

  As mentioned above, although embodiment of the sealing material for segments which concerns on this invention, and a tunnel structure provided with this was described, this invention is not limited to said 1st Embodiment, It changes suitably in the range which does not deviate from the meaning. Is possible. For example, in this embodiment, the segment sealing material 2 is composed of a silicon rubber 2a having an L-shaped cross section and a chloroprene rubber 2b having a rectangular cross section mixed with a water-absorbing polymer, and the adjacent segments 1 are joined. In this state, the exposed outer surfaces 2f of the chloroprene rubber 2b of the pair of segment sealing materials 2 are in close contact with each other. However, as shown in FIG. 3, the segment sealing material is in contact with the outer surfaces of the silicon rubber 2a. 2 may be installed in the recess 1b of the segment 1, and in this case, the groundwater comes into contact with the outer surface 2e of the chloroprene rubber 2b exposed facing the excavation surface T1, and the water-absorbing polymer absorbs the groundwater. As the chloroprene rubber 2b expands along with this, the silicon rubbers 2a of the pair of segment sealing materials 2 are firmly and tightly connected. And, it is possible to ensure the water-blocking.

  Further, as shown in FIG. 4, the segment sealing material 2 may be configured by fitting and fixing a chloroprene rubber 2b mixed with a water-absorbing polymer in an inner hole of a silicon rubber 2a formed in a U-shaped cross section. In this case as well, as with the segment sealing material 2 shown in FIG. 3, the silicon rubbers 2a can be firmly adhered to each other to ensure water-stopping.

  Furthermore, as shown in FIG. 5, the segment sealing material 2 may be formed by fixing the outer surface of a rectangular cross-sectional chloroprene rubber 2b mixed with a water-absorbing polymer to one surface of a flat silicon rubber 2a. Even in this case, it is possible to obtain water-stopping and heat resistance by placing the silicon rubber 2a inside the tunnel T and placing the exposed outer surface 2e of the chloroprene rubber 2b on the excavation surface T1 side. is there.

  Furthermore, as shown in FIG. 6, the segment sealing material 2 may be formed by mixing a water-absorbing polymer into the silicon rubber 2b. In this case, the ground water contacts the segment sealing material 2, and silicon The water-absorbing polymer in the rubber 2a absorbs groundwater and the silicon rubber 2a expands to ensure water-stopping properties, and the water-absorbing polymer that retains the groundwater can provide heat resistance.

  In the present embodiment, the segment sealing material 2 is formed in a rectangular cross section, but the present invention is not limited to this, and the segment sealing material 2 may be formed in a circular cross section or a trapezoidal cross section. Further, in the present embodiment, the segment sealing material 2 is provided in two pieces on each end face 1a of the segment 1. However, the number of segment sealing materials 2 is not particularly limited, for example, One article may be sufficient.

  Furthermore, in this embodiment, the segment 1 is a concrete segment or a composite segment in which steel and concrete are combined, and the concrete of the segment 1 has a water-cement ratio of 40% or less and has a diameter of, for example, 10 to 200 μm and a length. A concrete segment or synthetic segment that is formed by mixing 0.05% to 0.3% by volume of organic fibers such as 1 to 20 mm of polyacetal or polypropylene, but not containing organic fibers in the concrete. The segment sealing material 2 of the present invention may be applied to a tunnel structure including the above, and a tunnel structure including a steel segment.

  Next, with reference to FIG. 1 and FIG. 7, a segment seal material and a tunnel structure including the same according to a second embodiment of the present invention will be described. Similar to the first embodiment, the present embodiment is a segment sealing material that is disposed between end faces of adjacent segments of a road tunnel constructed by, for example, a shield method, and prevents the occurrence of water leakage and the like. It is related with the tunnel structure provided with. Therefore, here, the same reference numerals are given to the components common to the first embodiment, and the detailed description thereof is omitted.

  The segment sealing material (sealing material) 2 of the present embodiment is formed in a substantially cylindrical shape having a substantially cross-sectional rectangular shape with a silicon rubber 2a, and has a circular cross section penetrating from one outer surface 2g to the inner surface facing the outer surface 2g. A plurality of through-holes 2h are formed at a predetermined interval in the extending direction of the sealing material 2. Further, a water-absorbing polymer 2k is loaded in the hollow portion 2j of the silicon rubber 2a communicating with the outside through the through hole 2h. And the sealing material 2 formed in this way is installed in the recessed part 1b of the segment 1 by arranging the opening side of the through hole 2h on the excavation surface T1 side.

  In the sealing material 2 having the above-described configuration and the tunnel structure B including the same, the segments 1 are joined to each other, and the sealing material 2 facing each other is interposed between the end surfaces 1a of the segments 1, and the excavation surface T1 side The groundwater that has entered through the water is absorbed into the water-absorbing polymer 2k in the hollow portion 2j through the through hole 2h. And the outer surface of the silicon rubber 2a which mutually opposes firmly adhere | attaches, when the water absorbing polymer 2k expands with water absorption of groundwater. This prevents water leakage inside the tunnel T.

  On the other hand, even when a fire occurs in the tunnel T, the water-absorbing polymer 2k included in the silicon rubber 2a absorbs groundwater, so the temperature of the sealing material 2 is maintained at a low temperature, and the heat at the time of the fire The sealing material 2 is not damaged.

  Therefore, according to the segment sealing material 2 and the tunnel structure B of the present embodiment, the silicon rubber 2a has the hollow portion 2j and the through hole 2h, and the hollow portion 2j is filled with the water-absorbing polymer 2k, and the through hole 2h. Since the segment sealing material 2 is installed with the opening side of the surface facing the excavation surface T1, the groundwater can be brought into contact with the water-absorbing polymer 2k through the through holes 2h and absorbed. Thereby, similarly to 1st Embodiment, a water stop and heat resistance can be provided to the sealing material 2 for segments.

  As a modification of the second embodiment, the following segment sealing material 2 and tunnel structure B may be employed. In the present embodiment, the silicon rubber 2a of the segment sealing material 2 is provided with a plurality of circular through holes 2h penetrating from the outer surface to the inner surface, but the through holes 2h are formed, for example, in a rectangular cross section. It may also be a single slit that opens along the extending direction of the segment sealing material 2. Further, as shown in FIG. 8, a water guide 4 may be provided inside the through-hole 2h. In this case, groundwater from the excavation surface T1 side is absorbed by the water absorption in the hollow portion 2j of the silicon rubber 2a. Water can be guided toward the water-soluble polymer 2k, and the water-absorbing polymer 2k can reliably absorb groundwater. Thereby, it becomes possible to improve the water-stopping property and heat resistance of the segment sealing material 2 with certainty.

  In the present embodiment, the water absorbing polymer 2k is loaded in the hollow portion 2j of the silicon rubber 2a. For example, the chloroprene rubber 2b mixed with the water absorbing polymer shown in the first embodiment is formed in the hollow portion 2j. It may be provided. Also in this case, the groundwater that has entered the hollow portion 2j through the through hole 2h is absorbed by the water-absorbing polymer, and the chloroprene rubber 2b expands with this, thereby imparting water-stopping and heat resistance to the segment sealing material 2. be able to.

  Further, in the present embodiment, similarly to the first embodiment, the segment sealing material 2 need not be limited to being formed in a rectangular cross section, and may be formed in a circular cross section or a trapezoidal cross section. It ’s good.

It is a perspective view which shows the tunnel structure which concerns on 1st and 2nd embodiment of this invention. It is the XX arrow directional view of FIG. 1 which shows the sealing material for segments comprised in the tunnel structure which concerns on 1st Embodiment of this invention. It is a figure which shows the modification of the sealing material for segments which concerns on 1st Embodiment of this invention, and a tunnel structure provided with the same. It is a figure which shows the modification of the sealing material for segments which concerns on 1st Embodiment of this invention, and a tunnel structure provided with the same. It is a figure which shows the modification of the sealing material for segments which concerns on 1st Embodiment of this invention, and a tunnel structure provided with the same. It is a figure which shows the modification of the sealing material for segments which concerns on 1st Embodiment of this invention, and a tunnel structure provided with the same. It is the XX arrow directional view of FIG. 1 which shows the sealing material for segments comprised in the tunnel structure which concerns on 2nd Embodiment of this invention. It is a figure which shows the modification of the sealing material for segments which concerns on 2nd Embodiment of this invention, and a tunnel structure provided with the same.

Explanation of symbols

1 Segment 1a End face 1b Recess 2 Segment seal material (seal material)
2a Silicon rubber 2b Chloroprene rubber 2e mixed with water-absorbing polymer 2e outer surface 2g outer surface 2h through hole 2j hollow portion 2k water-absorbing polymer 4 water guide material A tunnel structure B tunnel structure T tunnel T1 excavation surface

Claims (11)

A segment sealing material provided between end surfaces of adjacent segments of a plurality of segments covering the excavation surface of the tunnel, for preventing water leakage between the end surfaces of the segments,
A segment sealing material comprising silicone rubber and a water-absorbing polymer. In the segment sealing material according to claim 1,
The segment sealing material, wherein the water-absorbing polymer is mixed in the silicon rubber. In the segment sealing material according to claim 1,
The segment sealing material, wherein the silicone rubber is provided so as to cover the outer surface of the chloroprene rubber in a state in which a part of the outer surface of the chloroprene rubber mixed with the water-absorbing polymer is exposed to the outside. . In the segment sealing material according to claim 1 or claim 3,
The silicon rubber is formed in a substantially cylindrical shape and has a through hole penetrating from the outer surface to the inner surface to communicate the hollow portion with the outside, and the water absorbing polymer or the water absorbing polymer is mixed in the hollow portion. A segment sealing material provided with chloroprene rubber. In the segment sealing material according to claim 4,
A segment sealing material, wherein a through-hole of the silicone rubber is provided with a water guiding material for guiding the external water into the hollow portion. In a tunnel structure comprising a plurality of segments covering the excavation surface of the tunnel, and a segment sealing material provided between the end surfaces of the adjacent segments to prevent water leakage from between the end surfaces of the segments,
A tunnel structure, wherein the segment sealing material is formed of silicon rubber and a water-absorbing polymer. The tunnel structure according to claim 6,
The tunnel structure, wherein the segment sealing material is formed by mixing the water-absorbing polymer with the silicon rubber. The tunnel structure according to claim 6,
The segment sealing material is formed so as to cover the outer surface of the chloroprene rubber in a state where the outer surface of a part of the chloroprene rubber mixed with the water-absorbing polymer is exposed to the outside. The tunnel structure characterized by being installed with the exposed outer surface of the chloroprene rubber facing the excavation surface side. In the tunnel structure according to claim 6 or claim 8,
The segment sealing material has a through-hole through which the silicone rubber is formed in a substantially cylindrical shape and penetrates from the outer surface to the inner surface to communicate the hollow portion with the outside, and the water-absorbing polymer or the chloroprene mixed with the water-absorbing polymer A tunnel structure characterized in that rubber is provided in the hollow portion, and the opening side of the through-hole is directed toward the excavation surface side. The tunnel structure according to claim 9,
The tunnel structure according to claim 1, wherein a through-hole of the silicon rubber is provided with a water guiding material for guiding the external water into the hollow portion. In the tunnel structure according to any one of claims 6 to 10,
The segment is a concrete segment or a composite segment in which steel and concrete are combined, and the concrete of the segment has a water cement ratio of 40% or less and 0.05% to 0.3% by volume of organic fibers mixed therein. A tunnel structure characterized by being formed.

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