JP2010024667A - Tunnel waterproof structure and construction method for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tunnel waterproof structure of a watertight tunnel or the like and a construction method for the same, having good durability and reliability enough to maintain waterproof performance even in a watertight tunnel requiring high performance. <P>SOLUTION: In this tunnel waterproof structure, the inner surface of natural ground G of an excavated tunnel T or the inner surface of the primary lining 1 is provided with a waterproof layer formed of a waterproof sheet or the like and the secondary lining 5. A waterproof sheet 3 as a first waterproof layer is laid through a buffer material 2 on the inner surface of the natural ground or the inner surface of the primary lining, and sectioning partition materials 6 partitioning a boundary part between the waterproof sheet and the secondary lining 5 into a plurality of section areas are provided integral with the inner surface side of the waterproof sheet. A second waterproof layer 4 formed in every section area partitioned by the sectioning partition materials 6 by injecting resin between the waterproof sheet and the secondary lining is integrally provided in a close contact with the wateproof sheet 3 and the secondary lining 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tunnel waterproof structure such as a watertight tunnel and a construction method thereof.

  Conventionally, as a tunnel waterproof structure such as a watertight tunnel, for example, as shown in FIG. 17, the inner surface of the primary lining 1 made of the inner surface of the ground G of the excavated tunnel T or the sprayed concrete formed on the inner surface of the ground Further, a waterproof sheet 3 as a prevention layer is laid through the buffer material 2, and a secondary lining 5 is provided inside the waterproof sheet.

  For example, as shown in FIG. 18A, the cushioning material 2 and the waterproof sheet 3 are preliminarily formed in a predetermined size, and the inner surface of the natural ground G or the inner surface of the primary lining 1 are sequentially joined together. As shown in FIG. 18 (c), the adjacent cushioning material 2 is generally laid on the inner surface of the natural ground or the primary lining 1 with concrete nails 10 or the like. The end portions of the adjacent waterproof sheets 3 are overlapped with each other and connected by welding or the like.

  Further, as shown in FIG. 18B, for example, the buffer material 2 is fixed to the inner surface of the natural ground G or the inner surface of the primary lining 1 with a synthetic resin sheet fixing disk 11 and a concrete nail 10. The waterproof sheet 3 is disposed and fixed inside the cushioning material 2 by welding the back surface of the waterproof sheet 3 adjacent to the disk 11.

  Then, concrete for lining is placed on the inner surface side of the waterproof sheet 3 to form the secondary lining 5. At that time, the waterproof sheet 3 is usually formed of synthetic rubber, synthetic resin or the like. Therefore, when the secondary lining 5 is formed on the inner side, the reinforcing steel bars and work machines embedded in the secondary lining 5 often come into contact with the waterproof sheet and are damaged or broken. There is a risk of.

  Therefore, for example, in Patent Document 1 below, even if the waterproof sheet is damaged by using the waterproof sheet 3 having the adhesive property with the concrete that forms the secondary lining 5 as described above, Proposals have been made to prevent water leakage unless cracks occur in the secondary lining at the same position. However, the top of the tunnel is always difficult to completely fill with concrete, and it is extremely difficult to fill without a 1 mm gap. Even if this type of concrete adhesive tarpaulin is used, it is difficult to fill with the secondary lining. It should be assumed that there is a non-adhesive gap in the tunnel. However, in the tunnel as described above, particularly in the watertight tunnel as shown in FIG. If there is a small scratch on the sheet at the top position, water can easily enter, and through the non-adhesive gap between the waterproof sheet and the secondary lining, it reaches the hair crack or joint position of the secondary lining concrete, There is a risk of leakage from there.

  In addition, as described in Patent Document 2 below, the applicant of the present invention is a water-stopping material injection means so that a water-stopping material can be injected later between the waterproof layer and the secondary lining even if water leaks. Proposed to provide. However, when the water leakage occurs, the water stopping material injecting means can repair the water. However, until the water actually leaks, a state in which water pressure is applied from the back side of the waterproof sheet is continued as in Patent Document 1. For this reason, it is expected that the damage to the waterproof sheet is expanding when water leakage occurs and repairs are made. In addition, since the prevention sheet is laid, a reinforcing bar is attached and a secondary lining is formed. Therefore, it is inevitable that the waterproof sheet is damaged, and if the secondary lining is completed, the waterproof sheet is waterproof. It cannot be confirmed whether or not the sheet is scratched.

  Furthermore, in Patent Document 3 below, it is proposed that a waterproof layer is formed by a sprayed waterproof film, not a waterproof sheet that cannot be damaged. It is extremely difficult to keep the spray thickness constant, and thin portions are often produced and weakened. For this reason, particularly in a watertight tunnel, there is a risk of breakage when a large water pressure is applied to this thin portion.

JP 2001-355398 A JP 2006-188918 A JP 2002-521595 A

  The present invention has been proposed in view of the above-described problems, and provides a durable and reliable tunnel waterproof structure capable of sufficiently maintaining waterproof performance even in a watertight tunnel, and a construction method thereof. For the purpose.

  In order to achieve the above object, the present invention is configured as follows. That is, the tunnel waterproof structure according to the present invention is a tunnel waterproof structure in which a waterproof layer made of a waterproof sheet or the like and a secondary lining are provided on the inner surface of the excavated tunnel or the inner surface of the primary lining. Alternatively, a partition that lays a waterproof sheet as a first waterproof layer on the inner surface of the primary lining through a cushioning material, and partitions the boundary between the waterproof sheet and the secondary lining into a plurality of partition regions A partition material is provided integrally on the inner surface side of the waterproof sheet, and is formed by injecting a resin between the waterproof sheet and the secondary lining for each partition region partitioned by the partition partition material. The waterproof layer is provided integrally with the waterproof sheet and the secondary lining in a state of being in close contact with each other.

  Moreover, the construction method of the tunnel waterproof structure according to the present invention provides a first waterproof layer via a cushioning material on the inner surface of the excavated tunnel or the inner surface of the primary lining when constructing the tunnel waterproof structure as described above. In addition to laying a waterproof sheet, a partition partition material for partitioning a boundary portion between the waterproof sheet and the secondary lining into a plurality of partition areas is integrally fixed to the inner surface side of the waterproof sheet in advance, and the waterproof After lining concrete is placed on the inner surface of the sheet to form a secondary lining, a resin is injected between the waterproof sheet and the secondary lining for each partition area partitioned by the partition partition material. The second waterproof layer is formed integrally with the waterproof sheet and the secondary lining in a state of being in close contact with each other.

  As described above, the tunnel waterproof structure according to the present invention not only lays the waterproof sheet as the first waterproof layer between the inner surface of the excavated tunnel or the inner surface of the primary lining and the secondary lining. Since the second waterproof layer formed by injecting a resin between the waterproof sheet and the secondary lining is provided integrally with the waterproof sheet and the secondary lining in close contact with each other. The two waterproof layers can waterproof more reliably and can maintain a good waterproof state even if one of the waterproof layers has a problem such as water leakage. And since the said 2nd waterproof layer is formed for every division partitioned off with the partition partition material, it is damaged by the waterproof sheet as a 2nd waterproof layer or 1st waterproof layer formed in any division by any chance Even if there is a problem such as water leakage due to the above, it can be prevented that it spreads to other partitioned areas.

  In the tunnel waterproof structure construction method according to the present invention, the waterproof sheet as the first waterproof layer is laid on the inner surface of the excavated tunnel or the primary lining formed on the inner surface of the natural mountain via a cushioning material. In addition, after forming a secondary lining in advance on the inner surface side of the waterproof sheet, between the waterproof sheet and the secondary lining, a second waterproof layer is formed by pressurizing and injecting resin at a predetermined pressure. Since the waterproof sheet and the secondary lining are integrally formed in close contact with each other, the cushioning material contracts in the thickness direction by the pressure of the resin, and the waterproof sheet and the secondary lining are formed. The second waterproof layer having a predetermined thickness can be easily formed between the two and the tunnel waterproof structure having excellent water tightness and waterproof performance can be easily and inexpensively constructed.

  Moreover, when the resin for forming the second waterproof layer is injected between the waterproof sheet and the secondary lining, the resin flows out to the natural ground side by the waterproof sheet and enters the natural ground crack. In addition, it is possible to prevent spreading and spreading over a wide range along the primary lining surface, and in the event that the waterproof sheet is damaged or damaged, it can be repaired with the above resin . Moreover, in addition to forming the second waterproof layer, the first and second waterproof layers take advantage of the characteristics that can ensure a substantially uniform thickness and the characteristics of the in-situ injection resin that is excellent in gap filling properties, By crushing the cushioning material by pressure injection of resin, the gap between the inside and outside of the waterproof sheet as the first waterproof layer is eliminated, the outside is firmly attached to the ground or the primary lining inner surface, and the inside is firmly attached to the secondary lining And can be held in close contact with each other.

  Furthermore, in the normal drainage type tunnel, the above-mentioned cushioning material needs to have water permeability in order to guide water from the natural ground downward along the back of the waterproof sheet and collect the water in the drain pipe. In the type tunnel, firstly, it is necessary to give priority to eliminating the void on the backside of the secondary lining in consideration of the problem of water pressure. In the present invention, by adjusting the injection pressure of the resin, In drainage type tunnels, the above cushioning material can be appropriately compressed to maintain water permeability, and in watertight type tunnels, the above cushioning material can be sufficiently crushed to eliminate voids, thereby improving water stopping performance. It is.

  Hereinafter, the present invention will be described in detail based on embodiments of the drawings in which the present invention is applied to a watertight tunnel. FIG. 1 is a cross-sectional front view of a watertight tunnel having a tunnel waterproof structure according to the present invention, and FIG. 2 is a partially enlarged view thereof.

  The watertight tunnel of this embodiment is made of a water permeable material such as a nonwoven fabric or a net-like material on the inner surface of the ground G of the excavated tunnel T or the inner surface of the primary lining 1 made of sprayed concrete or the like formed on the inner surface of the ground. A shock-absorbing material 2 and a waterproof sheet 3 as a first waterproof layer provided on the inner side of the shock-absorbing material 2 over almost the entire length in the tunnel circumferential direction and the tunnel axial direction. A second waterproof layer 4 formed by injecting resin is provided between the secondary lining 5 formed and formed. In addition, the said primary lining 1 may be abbreviate | omitted and the waterproof sheet 3 may be provided in the inner surface of the said natural ground G via the buffer material 2 directly.

The material and construction method of the cushioning material 2 and the waterproof sheet 3 are appropriate. For example, the material of the cushioning material 2 is a nonwoven fabric made of synthetic fibers such as polyester and polypropylene, and the weight per unit area is 300 to 500 g. / M ² can be used. As the material of the waterproof sheet 3, for example, a sheet material made of synthetic resin such as polyethylene having a thickness of about 2 mm, synthetic rubber, or the like can be used.

  The cushioning material 2 and the waterproof sheet 3 are laid on the inner surface of the natural ground G or the inner surface of the primary lining 1 in the same manner as in the above-described conventional example. FIG. 3A shows a state before the second waterproof layer 4 is formed, FIG. 3B shows a state after the second waterproof layer 4 is formed, and FIGS. f) is a partially enlarged view of portions c to f in (a) and (b), respectively.

  As shown in FIGS. 3 (d) and 3 (f), the adjacent cushioning materials 2 are overlapped with each other and fixed to the inner surface of the natural ground G or the inner surface of the primary lining 1 with concrete nails 10 or the like. The end portions of the adjacent waterproof sheets 3 may be overlapped with each other and connected by welding or the like as shown in FIGS. In particular, in the case of the figure, the end portions 3a and 3a of the adjacent waterproof sheets 3 are overlapped with each other, and the two are welded in two parallel lines along the overlapped portion. An unwelded part for inspection is provided between the welded parts.

  Further, the buffer material 2 has a required portion in the same manner as in the conventional example, as shown in FIGS. 3 (c) and 3 (e). The waterproof sheet 3 is fixed to the inner surface of the lining 1 and the rear surface of the adjacent waterproof sheet 3 is welded to the disk 11 so that the waterproof sheet 3 is disposed and fixed inside the cushioning material 2.

  As described above, the resin on the inner surface side of the waterproof sheet 3 as the first waterproof layer laid on the inner surface of the ground mountain G of the tunnel T or the inner surface of the primary lining 1 via the cushioning material 2 as described above. The second waterproof layer 4 and the secondary lining 5 are formed in this order, and the forming procedure and forming method thereof are appropriate, but the secondary waterproof layer 3 is provided inside the waterproof sheet 3. After the lining 5 is formed, when the second waterproof layer 4 is formed by pressurizing and injecting resin with a predetermined pressure between the secondary lining 5 and the waterproof sheet 3, a substantially constant thickness is obtained. The waterproof layer 4 can be easily and integrally formed between the waterproof sheet 3 and the secondary lining 5 in a state of being in close contact with them.

  In the present invention, when the secondary lining 5 is formed, the boundary between the waterproof sheet 3 and the secondary lining 5 must be partitioned into a plurality of partition regions. For example, the partitioning material 6 that performs this is provided integrally on the inner surface of the waterproof sheet 3, and resin injection means 7 is provided for injecting resin into the boundary portion for each partition region partitioned by the partitioning material 6. It is desirable to arrange in advance on the inner surface of the waterproof sheet 3.

  4 is a perspective view of a watertight tunnel showing an embodiment thereof, FIG. 5 is a longitudinal side view thereof, FIG. 6 is an enlarged view of portion A of FIG. 5, and FIG. 4 (a) is a waterproof sheet and a secondary cover. The state before forming the second waterproof layer with the work, FIG. 5B shows the state after forming the second waterproof layer. 7A is an enlarged view of a portion B in FIG. 5, and FIG. 7B is a cross-sectional view taken along line bb in FIG. In FIGS. 4, 5, and 7, the secondary lining 5 is represented by an imaginary line (two-dot chain line) in order to make it easy to understand the arrangement of the partition material 6 and the resin injection means 7. .

  In the present embodiment, as the partition partition material 6, as shown in FIGS. 4 to 6 and 8, a plurality of protrusions (six in the case of the figure) projecting toward the secondary lining 5 and extending in the tunnel circumferential direction. A flat strip-shaped partitioning material 6 having 6a is integrally provided on the inner surface of the waterproof sheet 3 by welding or the like. In the case of the figure, the partitioning partitioning material 6 is provided over almost the entire length in the tunnel circumferential direction. The partition partition material 6 and each of the protrusions 6a are provided so as to be continuous in a ring shape in the circumferential direction of the tunnel.

  Further, the arrangement position of the partitioning material 6 in the tunnel axis direction, that is, the partitioning position of the partitioning area can be easily recognized from the inside of the tunnel even after the secondary lining 5 is constructed on the inner surface side. In addition, it may be provided corresponding to the joint position of the secondary lining 5 to be constructed for each predetermined construction span S. In this embodiment, as shown in FIG. In the horizontal direction, the joint J of the secondary lining 5 is located.

  As described above, on the inner surface side of the waterproof sheet 3 as the first waterproof layer, the partition partition material 6 extending in the tunnel circumferential direction is provided with a predetermined interval in the tunnel axis direction (in this embodiment, secondary lining) By providing at a distance equal to the construction span S), the boundary between the waterproof sheet 3 and the secondary lining 5 constructed on the inner surface side has a plurality of lengths in the tunnel axis direction. It is partitioned into partitioned areas.

  When lining concrete for forming the secondary lining 5 is placed between the adjacent ridges 6a and 6a of the partitioning partition 6, the space between the ridges 6a and 6a becomes an air reservoir. In order to prevent the concrete from becoming unfilled, for example, as shown in FIG. 6, an exhaust hose 61 and an injection hose 62 may be arranged along the longitudinal direction of the ridge 6a. Then, when an unfilled portion is generated, if the remaining air is discharged from the exhaust hose 61 while injecting mortar or cement milk from the injection hose 62, the concrete or the like can be easily and reliably removed from the unfilled portion. Can be filled.

  Note that an exhaust injection hose 20 as shown in FIG. 9 may be used instead of at least one or both of the exhaust hose 61 and the injection hose 62. As shown in the figure, the exhaust injection hose 20 has a perforated pipe 21 having a large number of through-holes 21a on its peripheral surface covered with a braided pipe made of mesh or cloth. Two types of braided pipes 22 and 23 having different knitting methods and braid densities are covered, and the structure has a structure in which no concrete is inserted when placing concrete for secondary lining.

  Moreover, the resin injection | pouring means 7 for inject | pouring resin into the boundary part between the said waterproof sheet 3 and the secondary lining 5 for every division area partitioned off with the division partition material 6 as mentioned above is provided with the said waterproof sheet 3. In the present embodiment, the resin injection means 7 is a liquid-permeable injection having a large number of through-holes on the peripheral surface as shown in FIGS. 4, 5, and 7. A tube 71 and a resin injection hose 72 for supplying resin to the injection tube 71 from one end side thereof are used.

  As the injection tube 71, a resin made of urethane or the like can be circulated through a through hole formed in the peripheral surface, and the secondary lining concrete blockage blocks the through hole in the peripheral surface and is clogged. For example, an exhaust injection hose 20 shown in FIG. 9 can be used. The resin injection hose 72 may be made of any material as long as it can supply the injection tube 71 with a resin made of urethane or the like.

  In the present embodiment, the resin injection means 7 composed of the injection tube 71 and the resin injection hose 72 is provided in a plural number in the partition region for each span S as shown in FIGS. 4 and 5. In the illustrated example, the injection tubes 71 of the respective resin injection means 7 are arranged so that the longitudinal direction thereof is substantially parallel to the tunnel axis direction. As shown in FIG. The fixing band 73 is attached to the inner surface of the waterproof sheet 3, and each fixing band 73 is fixed to the inner surface of the waterproof sheet 3 by welding or the like. The resin injection hose 72 is formed long so that one end thereof is communicated and held with the injection tube 71 and the other end is exposed (projected) inward after the secondary lining 5 is applied. ing. The arrangement direction of the injection tube 71 is arbitrary. For example, the injection tube 71 may be arranged in an orientation extending along the circumferential direction of the tunnel.

  When constructing the tunnel waterproof structure configured as described above, the inner surface of the ground T of the tunnel T excavated by a predetermined length or the inner surface of the primary lining 1 made of sprayed concrete formed on the inner surface of the ground Then, a waterproof sheet 3 as a first waterproof layer is laid through a cushioning material 2 made of nonwoven fabric or the like, and concrete for lining is placed inside the waterproof sheet 3 to form a secondary lining 5. Next, a resin is pressurized and injected between the secondary lining 5 and the waterproof sheet 3 at a predetermined pressure from the resin injection hose 72 of each of the resin injection means 7 via the injection tube 71. The waterproof layer 4 is formed between the waterproof sheet 3 and the secondary lining 5.

  The material of the resin forming the second waterproof layer 4 is appropriate. For example, a urethane resin in which a liquid A made of polyether polyol and a liquid B made of isocyanate are mixed at a predetermined weight ratio can be used. . In particular, it is desirable that the mixed viscosity is a low viscosity and high fluidity of about 80 ± 30 mPa · s at normal temperature (23 ° C.). Also, it is desirable that the pot life is relatively long, for example, about 60 minutes so as not to hinder the resin injection and filling operations. The resin used in this application is not only capable of water-stopping and pressure-feeding after curing, but also has a low viscosity in a mixed state, penetrability into fine gaps due to high flow, and sufficient pot life exceeding the working time. In addition to the above, for example, an acrylic resin or an epoxy resin can be used as long as the conditions of flexibility and elasticity after curing can be achieved.

  As described above, the tunnel waterproof structure according to the present invention lays the cushioning material 2 and the waterproof sheet 3 as the first waterproof layer on the inner surface of the ground or the primary lining of the excavated tunnel T, and the waterproof sheet. Since the second waterproof layer 4 formed by injecting resin is provided between the secondary lining 5 inside 3, the tunnel T can be waterproofed more reliably by the two waterproof layers 3 and 4. Even if any of the above waterproof layers has a problem such as water leakage, the waterproof state can be maintained well. And since the said 2nd waterproof layer 4 is formed for every division area (every construction span S of the secondary lining 5 in the said embodiment) divided by the division partition material 6, by any chance division Even if the waterproof sheet 3 or the second waterproof layer 4 as the first waterproof layer formed in the region has a problem such as water leakage, the problem can be prevented from spreading to other sections.

  Further, when constructing the tunnel waterproof structure as described above, after forming the waterproof sheet 3 as the first waterproof layer on the inner surface of the natural ground or the inner surface of the primary lining, the concrete for lining is cast on the inner surface side. To form a secondary lining 5 and pressurize and inject a resin such as urethane at a predetermined pressure between the secondary lining 5 and the waterproof sheet 3 to form the second waterproof layer 4. Then, the second waterproof layer 4 having a substantially constant thickness is easily formed between the waterproof sheet 3 and the secondary lining 5 while the cushioning material 2 contracts in the thickness direction by the pressure of the resin. In addition, the second waterproof layer 4 is integrally fixed to the inner surface of the waterproof sheet 3 and the back surface (outer surface) of the secondary lining 5 in a well-adhered state, thereby achieving watertightness and prevention performance. An excellent tunnel waterproof structure can be constructed easily and inexpensively.

  In addition, when the resin for forming the second waterproof layer 4 is injected between the waterproof sheet 3 and the secondary lining 5, it is injected for each partition area partitioned by the partition partition material 6. There is no concern that the resin will flow too much and become uneven and there will be no unfilled parts, and the resin will be injected into the already closed space between the waterproof sheet 3 and the secondary lining 5. Can be prevented from flowing out to the natural ground side and entering the natural ground crack, or spreading over a wide area along the surface of the primary lining 1. Further, if the waterproof sheet 3 is damaged or damaged, it can be repaired with the resin.

  As described above, the waterproof sheet 3 as the first waterproof layer and the second waterproof layer 4 each take advantage of the characteristics that can ensure a substantially uniform thickness and the characteristics of the on-site injection resin that is excellent in gap filling properties. Thus, the second waterproof layer 4 can be formed. At this time, even if the cushioning material 2 is partially crushed by pressure injection of resin, the cushioning material 2 has sufficient thickness and elasticity. If it has what it has, it will eliminate the gap inside and outside of the waterproof sheet 3 by being crushed, the outside is the ground G or the inner surface of the primary lining 1, and the inner side is the back of the secondary lining 5, respectively. It can be fixed together in a tightly adhered state.

  In the above-described embodiment, the resin injection hose 72 is provided only on one end side of the injection tube 71. However, the resin injection hose 72 may be connected to both ends of the injection tube 71. The end opposite to the injection tube 71 is exposed to the inside even after the secondary lining 5 is applied.

  10 to 12 show an embodiment of the modified example as described above. As the resin injection means 7, one end of a resin injection hose 72 is connected to both ends of an injection tube 71 configured in the same manner as described above. In addition, the other end of each resin injection hose 72 is exposed to the inside even after the secondary lining 5 is applied. As shown in FIG. 12, the injection tube 71 has a configuration in which the fixing band 73 is attached to the inner surface of the waterproof sheet 3 in the same manner as in the embodiment, and each fixing band 73 is welded to the inner surface of the waterproof sheet 3 or the like. It is fixed by. The injection tube 71 is formed to be slightly shorter than the length of the span S, and a plurality of the injection tubes 71 are arranged at a predetermined interval in the circumferential direction of the tunnel in a state where the injection tube 71 is arranged in a direction substantially parallel to the tunnel axis direction in the partition region for each span S. Each book is provided.

  In FIGS. 10 and 11, the secondary lining 5 is imaginary lines (as shown in FIGS. 4 and 5 in order to make it easy to understand the arrangement of the resin injection means 7, the partition material 6, etc. It is represented by a two-dot chain line). 12A shows a state before the second waterproof layer 4 is formed between the waterproof sheet 3 laid on the inner surface of the primary lining 1 and the secondary lining 5, and FIG. The state after forming the waterproof layer 4 is shown.

  As described above, the resin injection hose 72 is connected to both ends of the injection tube 71 as the resin injection means 7, or the entire length of the resin injection means 7 including the resin injection hoses 72 and 72 at both ends is the injection tube 71. If both ends of the resin injection means 7 are configured so as to penetrate the secondary lining 5 and be exposed in the tunnel space, the resin is injected from one end side and overflows from the other end side. It is possible to easily perform complete resin injection and confirmation of the situation. If there is no overflow of the resin to the other end side, the resin can be injected also from the other end side. Other configurations are the same as those of the above-described embodiment, and the same operational effects can be obtained.

  Furthermore, although each said embodiment used the injection tube 71 as the resin injection | pouring means 7, it can also use a grout disk instead. FIG. 13 to FIG. 16 show one embodiment, and in the same manner as in each of the above embodiments, a disc-shaped grout disk 75 as the resin injection means 7 is formed on the inner surface side of the waterproof sheet 3, and resin is applied to the grout disk 75. A resin injection hose 76 for supply is provided. Particularly, in the case of the figure, a plurality of resin injection means 7 comprising the grout disk 75 and the resin injection hose 76 are provided in the partition region for each span S, and each grout disk 75 is provided around the periphery thereof. The resin as described above is fixed to the inner surface of the waterproof sheet 3 at a predetermined interval in such a manner that the resin can be discharged.

  The structure of each of the grout disks 75 and the method of attaching to the waterproof sheet 3 are appropriate. FIGS. 16 (a) and 16 (b) are integrated with the periphery of the disk body 75a having a substantially flat solid thickness. The flange portion 75b is provided at the plurality of circumferential portions on the waterproof sheet 3 side of the flange portion 75b, and weld portions 75c with the waterproof sheet 3 are provided, and the weld portions 75c and 75c adjacent in the circumferential direction are not welded. A portion 75d is provided. In the figure, reference numeral 75e denotes a resin distribution passage formed in the grout disk main body 75a.

  When each of the grout disks 75 is configured as described above, the grout disk main body 75a is solid so as to be less deformable than the waterproof sheet 3, and is laid on the inner surface of the natural ground of the tunnel T or the inner surface of the primary lining 1. A state where the non-welded portion 75d is floated with respect to the waterproof sheet 3 by partially welding the peripheral flange portion 75b of the disk 75 which is not easily deformed where the flexible waterproof sheet 3 is undulated, and the resin can be discharged freely. It can be.

  Each of the grout discs 75 can be modified in addition to the above. For example, as shown in FIG. 16C, a flange portion 75b similar to the above is integrated with the peripheral portion of a disc body 75a formed in a flat bowl shape. A plurality of circumferential portions of the flange portion 75b on the waterproof sheet 3 side are welded to the waterproof sheet 3 in the same manner as described above, and a resin is formed from the non-welded portion 75d between the weld portions 75c and 75c adjacent in the circumferential direction. May be discharged.

  Each grout disk 75 configured as described above is integrally provided with the resin injection hose 76 so as to communicate with the disk main body 75a, and the end of the injection hose 76 opposite to the disk 75 is provided. Is exposed to the tunnel space through the secondary lining 5, and its injection hose 76 is short enough to protrude the resin inlet into the grout disk 75 toward the inner surface of the secondary lining 5. Things can be used.

  By using the resin injection means 7 comprising the grout disk 75 and the injection hose 76 configured as described above, the resin is injected between the waterproof sheet 3 and the secondary lining 5 in the same manner as in the above embodiment. Thus, the second waterproof layer 4 can be formed, and substantially the same effect as described above can be obtained. In particular, since the grout disk 75 of the above embodiment does not have to have a special structure like the injection tube 71, the structure is simple and there is little risk of crushing, and it can be manufactured easily and inexpensively. Other configurations are the same as those of the above-described embodiment, and the same operational effects can be obtained.

  In each of the above-described embodiments, the partitioning material 6 is placed at a predetermined interval in the tunnel axis direction so that the longitudinal direction thereof is the circumferential direction of the tunnel, and in the case of the drawing, the same interval as the construction span S of the secondary lining is provided. However, the above-mentioned interval is appropriate, and the partition partitioning member 6 is provided in a direction parallel to the tunnel axis direction so that the plurality of partition regions are formed in the tunnel circumferential direction. You may make it form. Alternatively, the partitioning material 6 may be provided in a direction parallel to the tunnel circumferential direction and the axial direction to form a plurality of partitioned regions in the tunnel axial direction and the circumferential direction, respectively.

  Moreover, although the said embodiment showed the example applied to the watertight type | mold tunnel which provides a waterproof layer all around a tunnel, For example, it can apply also to the type of tunnel which provides a waterproof layer only in the arch part except the invert part of a tunnel. it can.

  As described above, in the tunnel waterproof structure and the construction method according to the present invention, the waterproof sheet 3 as the first waterproof layer is laid on the inner surface of the natural ground of the tunnel T or the inner surface of the primary lining 1 through the cushioning material 2. In addition, since the second waterproof layer 4 formed by injecting resin is provided between the secondary lining 5 formed on the inside thereof, the waterproof performance and its reliability and durability are good. The tunnel waterproof structure can be easily and inexpensively constructed, is effective as a waterproof structure for various tunnels and a construction method thereof, and can be used well industrially.

The cross-sectional front view of the water tight tunnel which constructed the tunnel waterproof structure by this invention. The vertical side view of the said water tight tunnel. (A) is an enlarged longitudinal sectional side view of a part of the watertight tunnel before forming the second waterproof layer, (b) is the same view as above after forming the second waterproof layer, (c) to (c) (f) is the elements on larger scale of cf part in (a) and (b), respectively. The perspective view of the water tight tunnel of one Embodiment which shows the example of arrangement | positioning of a partition partition material and a resin injection | pouring means. The vertical side view of the said water tight tunnel. (A) is an enlarged vertical sectional side view of part A in FIG. 5 before forming the second waterproof layer, and (b) is the same view after forming the second waterproof layer. (A) is an enlarged vertical sectional side view of a portion B in FIG. 5, and (b) is a bb cross-sectional view in (a). The perspective view which shows an example of a partition partition material. Explanatory drawing which shows an example of an exhaust injection hose. The perspective view of the water tight tunnel of other embodiment which shows the example of arrangement | positioning of a partition partition material and a resin injection | pouring means. The vertical side view of the said water tight tunnel. (A) is an enlarged vertical sectional side view of part C in FIG. 11 before forming the second waterproof layer, and (b) is the same view as above after forming the second waterproof layer. The perspective view of the water tight tunnel of other embodiment which shows the example of arrangement | positioning of a partition partition material and a resin injection | pouring means. The vertical side view of the said water tight tunnel. The expanded vertical side view of the D section in FIG. (A) is a top view of the resin injection | pouring means used in the said embodiment, (b) is the vertical side view, (c) is a vertical side view of the example of a change. The conventional watertight tunnel crossing front view. (A) is a partial enlarged vertical side view of the conventional water-tight tunnel, and (b) and (c) are partial enlarged views of portions b and c in (a).

Explanation of symbols

T tunnel G ground mountain 1 primary lining 2 cushioning material 3 waterproof sheet (first waterproof layer)
4 Second waterproof layer 5 Secondary lining 6 Partition divider 6a Projection 7 Resin injection means 71 Injection tube 72, 76 Resin injection hose 73 Fixing band 75 Grout disc 10 Concrete nail 11 Sheet fixing disc S Construction span

Claims (3)

In the tunnel waterproof structure where a waterproof layer made of a waterproof sheet or the like and a secondary lining are provided on the inner surface of the excavated tunnel or the inner surface of the primary lining,
A waterproof sheet as a first waterproof layer is laid on the inner surface of the natural ground or the inner surface of the primary lining through a cushioning material, and a plurality of boundary portions between the waterproof sheet and the secondary lining are formed. A partition partition material for partitioning into partition regions is integrally provided on the inner surface side of the waterproof sheet, and a resin is injected between the waterproof sheet and the secondary lining for each partition region partitioned by the partition partition material. A tunnel waterproof structure, wherein the second waterproof layer is integrally provided on the waterproof sheet and the secondary lining in close contact with each other. In constructing the tunnel waterproof structure according to claim 1,
A waterproof sheet as a first waterproof layer is laid on the inner surface of the ground or primary lining of the excavated tunnel via a cushioning material, and a plurality of boundary portions between the waterproof sheet and the secondary lining are provided. After partitioning the partition material to be partitioned into individual partition areas integrally fixed in advance to the inner surface side of the waterproof sheet, after forming a secondary lining by placing concrete for lining on the inner surface side of the waterproof sheet, A resin was injected between the waterproof sheet and the secondary lining for each partition area partitioned by the partition partition material, and the second waterproof layer was brought into close contact with the waterproof sheet and the secondary lining, respectively. A tunnel waterproof structure construction method characterized by being integrally formed in a state.   Before placing the concrete for lining, a resin injecting means is arranged in advance on the inner surface side of the waterproof sheet, and after forming the secondary lining by placing the concrete for lining, the resin injecting means The method for constructing a tunnel waterproof structure according to claim 2, wherein the second waterproof layer is formed by pressurizing and injecting a resin at a predetermined pressure to a boundary portion of each partition region.

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