JP2005264466A - Caulking material for shielding segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water inside a tunnel from seeping outside at a segment joint part in constructing a tunnel of a sewer or the like by a compact shield tunneling method (without secondary lining work). <P>SOLUTION: This caulking material 1 for shielding segments is constituted by integrally forming a cut-off part 2 composed of a material (e.g., unfoamed EPDM) with material properties for ensuring cut-off performance to water inside the tunnel, and a joint forming part 3 formed of a material (e.g., a thermal expansion type plastic refractory material or a CPE or CR-based flame retarder) with excellent flame resistance. The caulking material 1 is used for the joint part of the segments 11 to fill a clearance between the end faces of the segments 11 and to prevent water inside the tunnel from seeping outside of the tunnel from the joint part of the segments 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a shield segment caulking material used for a joint portion of a segment constituting a wall of a tunnel in a shield construction method for constructing a tunnel using a shield machine.

  Currently, when building tunnels for roads, railways, etc. or tunnels for building sewer pipes, the shield method is generally adopted. The shield method is a method of excavating a tunnel hole while propelling a shield machine with a drilling blade at the tip in the ground.

  In the shield method, a primary lining that constructs the wall of the tunnel by sequentially assembling the segments along the inner wall of the excavation part behind the shield machine while excavating the ground with the shield machine, and this primary lining After the completion, secondary lining is performed to coat the inner wall surface with concrete or resin.

The segment used in such a shield method is, for example, a size that divides the circumference in the tunnel into a plurality of pieces (for example, 4 to 6 divisions), and is successively added in the circumferential direction and the shield tunnel extending direction. Examples of the segment include a concrete segment, a steel segment made of only a steel plate, and a steel shell segment filled with concrete in a steel shell (for example, see Patent Document 1).
JP 2001-220999 A

  By the way, in the shield method, a shield method in which secondary lining is omitted has been proposed in order to reduce cost, reduce excavation cross-sectional area, shorten the work period, and the like.

  In this shield method, where the secondary lining is omitted, the tunnel wall is composed of only concrete segments (secondary lining integrated segments) that have been internally finished such as smoothing the inner surface. Since the inner wall of the body is not coated, when constructing sewer pipes, etc., in addition to preventing the entry of groundwater into the tunnel (water stoppage), leaching of sewage flowing inside the tunnel to the outside It is also required to prevent this.

  The present invention has been made in consideration of such points, and in the construction of a tunnel such as a sewer pipe by the secondary lining integrated shield method, water inside the tunnel leached out from the segment joint to the outside of the tunnel. An object of the present invention is to provide a caulking material for a shield segment that can be prevented.

  The caulking material for the shield segment of the present invention is a shield construction method for constructing a tunnel wall body by sequentially assembling the segments along the peripheral inner wall surface of the excavation part behind the shield machine while excavating the ground with a shield machine. The caulking material is disposed between the end surfaces of the adjacent segments, and the water stop portion and the joint forming portion are integrally formed, and the water stop portion has a water stop performance with respect to the water inside the tunnel. It is made of a material having physical properties that can be secured, and the joint forming part is characterized by being made of CPE, a CR-based flame retardant, or a thermally expandable plastic refractory material.

  As shown in FIG. 3, the shield segment caulking material of the present invention is used by being attached to a portion S1 along the circumferential direction inside the segment end surface and a portion S2 along the axial direction. When the end faces are brought into contact with each other, the water stop portion of the caulking material is compressed at the segment end face, and water stoppage is ensured. Furthermore, since the gap between the segment end surfaces formed on the inner side of the segment is filled with the joint forming portion having flame retardancy, it can be used in places requiring fire countermeasures such as a subway.

  Next, each part of the present invention will be described in detail.

[Water stop part]
In the caulking material for the shield segment of the present invention, the water stop portion is preferably composed of a non-foamed material, especially considering water resistance, anticorrosion against sewage (chemical resistance), deformation followability, etc. It is preferably made of non-foamed EPDM (a copolymer of ethylene, propylene and a third component), SBR (a copolymer of styrene and butadiene), or a water-swellable material.

-Improved water-stop-
In the caulking material for the shield segment of the present invention, it is preferable that the water stop portion has a convex shape in one of two surfaces pressed by the segment end surface. Thus, when a water stop part is made into a convex shape, the deformability when a water stop part is compressed will become favorable. And when a water stop part is compressed, the compressive stress of the center part of a convex part becomes large, and higher water stop performance can be obtained. In addition, you may make both surfaces of a water stop part convex.

-Adhesion to segments-
In the water stop portion, it is preferable that an adhesive is disposed on one of the two surfaces pressed by the segment end surface. As described above, when the adhesive is provided on one surface of the water stop portion, the work when the caulking material is attached to the end surface of the segment is simplified. Examples of the adhesive include adhesive tapes such as double-sided adhesive tapes, urethane adhesives, epoxy adhesives, polyester adhesives, rubber adhesives, and the like. In addition, you may arrange | position such an adhesive also to the single side | surface of the said joint formation part.

-Joining segments-
In addition, the water-stop portion is composed of a layer impregnated with an oil component having a lubricating performance on one of the two surfaces pressed by the segment end surface, and the other surface side is impregnated with the oil component. It is preferable that the layer is composed of an unpermitted layer.

  When such a caulking material for a shield segment is used, when a segment to be assembled is inserted and arranged in a segment ring for one ring (see FIG. 15), the contact portion between the caulking materials becomes slippery and the caulking material is good. It is possible to prevent twisting or wrinkling from occurring.

[Joint formation part]
The joint forming part is made of CPE (chlorinated polyethylene), CR flame retardant or thermal expansion plastic refractory material, so that it can be applied to the caulking of the inner surface of a segment that requires fire countermeasures such as a subway. Can do.

[Method of manufacturing caulking material for shield segment]
As a manufacturing method of the caulking material for shield segments of the present invention, for example, (1) a material (non-foamed EPDM, SBR or water-expandable material) constituting the water stop portion and a material constituting the joint forming portion (CPE, CR) A method of integrally molding by co-extrusion of a flame retardant or a heat-expandable plastic refractory material), or (2) extruding the water-stopping portion and the joint forming portion individually, and the extrusion step A method in which the water-stopping portion and the joint forming portion are bonded to each other by adhesion or heat fusion at the subsequent stage can be exemplified.

[Construction method, method of sticking to segment]
When the caulking material for shield segment of the present invention is affixed to the segment, if there is a corner portion (see FIG. 11) in the arrangement portion (applying portion) of the caulking material on the segment end face (see FIG. 11), the caulking material is placed at a right angle as shown in FIG. A method of pasting in accordance with the method, or a method of performing a 45-degree cut on the end of the caulking material and pasting the cut ends together.

  As another method, the caulking material for the shield segment is formed into a shape that matches the arrangement part (attachment part) of the segment end face, and the caulking material (integrated product) is applied to the end face of the segment at the construction site. You may employ | adopt the method of sticking. In this case, since the cutting operation of the caulking material is not required at all, the workability is greatly improved and the water-stopping property is also increased.

  As described above, according to the shield segment caulking material of the present invention, the water stop portion made of a material having physical properties capable of ensuring the water stop performance against the water inside the tunnel, and the segment end face formed on the tunnel inner side Since the joint formation part composed of a material with physical properties capable of filling the gaps between them is formed integrally, in the shield method that does not perform secondary lining, it can be used for the junction part of the segment. The gap between the segment end faces formed on the inner side can be filled, and water in the tunnel can be reliably prevented from leaching out of the tunnel from the segment joint portion. Moreover, since the joint forming portion is made of CPE, CR-based flame retardant or thermal expansion type plastic refractory material, it can be applied to, for example, caulking on the inner surface of a segment requiring fire countermeasures such as a subway.

  Moreover, since the caulking material for shield segments of the present invention can be transported to the site in a state of being directly attached to the segment, the site construction is shortened. Furthermore, quality control can be performed in the factory, so high quality can be maintained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, the segments used in the secondary lining integrated shield method will be described.

  The segment constitutes a wall of the tunnel. For example, as shown in FIG. 1, the segment ring 10 can be constructed by assembling four segments 11.

  The segment 11 is made of concrete, and is a secondary lining integrated type segment that is subjected to inner surface finishing such as inner surface smoothing. When the construction of a sewer pipe is intended, a secondary lining integrated segment with an invert groove is used as a segment arranged at the bottom of the tunnel.

When constructing a wall of the shield tunnel T using such a segment 11, first, a shield machine (not shown) provided with an excavating blade at the tip is propelled laterally into the ground. When the space for one ring of the segment ring 10 is formed in the rear, the propulsion of the shield machine is stopped, and the segment 1 is moved along the inner wall surface of the rear space of the shield machine.
Assemble 1 ... 11 in a ring shape. Next, in the same way, the shield machine is propelled by one ring of the segment ring 10 and the process of assembling the segments 11. A shield tunnel (for example, a sewer pipe) T as shown in FIG. 1 can be constructed.

  In the shield method as described above, the segments 11 adjacent to each other are connected to each other by a joining method such as joining using a connecting bolt, joining by fitting unevenness, joining using a connecting fitting, or the like.

  As shown in FIG. 2, a seal portion (concave portion) 20 is provided at the joint portion of the segment 11. The seal portion 20 is provided with a water-expandable seal material 5 for preventing (water stoppage) intrusion of water (groundwater) from the outside of the tunnel. Further, a joint portion 30 is provided inside the tunnel of the joint portion of the segment 11, and the shield segment caulking material of the present invention is disposed on the joint portion 30.

  In addition, the seal part 20 and the joint part 30 are provided in all the end surfaces of the segment 11 (refer FIG. 3). Further, as shown in FIG. 2, a joint inner surface 31 orthogonal to the axial direction of the segment is formed in the joint portion 30 of the segment 11. The joint inner surface 31 may have a straight shape in which the width dimension between the two surfaces of the joint inner surface 31 is constant in a state in which the end surfaces of the two segments 11 are abutted with each other, or is reduced toward the inner side of the segment. Such an inclined surface may be formed (see FIG. 7).

  Next, an embodiment of a caulking material for a shield segment (hereinafter referred to as a caulking material) of the present invention will be described with reference to FIG.

  The caulking material 1 is a band-shaped member in which the water stop portion 2 and the joint forming portion 3 are integrally formed. The water stop part 2 and the joint formation part 3 are comprised with the material of a mutually different physical property.

  As for the water stop part 2, one surface 21 is shape | molded in convex shape (a cross-sectional substantially semicircle shape) among the two surfaces 21 and 22 pressed by a segment end surface. A double-sided pressure-sensitive adhesive tape 4 is stuck to the other surface 22 of the water stop portion 2 (including the surface 32 of the joint forming portion 3) along the longitudinal direction. The thickness of the water stop portion 2 (the maximum thickness of the convex top portion) is set to a dimension larger by a predetermined amount (for example, 2 mm) than the distance between the compression surfaces 31 of the joint portions 30 of the segment 11.

  The joint forming portion 3 has a shape that matches the joint inner surface 31 (FIG. 2) of the joint portion 30 of the segment 11 and is processed into a shape and size so as to contact the substantially entire surface of the joint inner surface 31 of the joint portion 30 without a gap. Has been.

  As the material for the water stop portion 2, unfoamed EPDM having a physical property of 55 ± 5 according to JIS K-6253 is used. Further, as the material of the joint forming part 3, a thermal expansion type plastic refractory material is used. The thermal expansion type plastic refractory material is in the form of a sheet and is used as a sealing material or a caulking material, and has a function of expanding by heat at the time of a fire and preventing the invasion and diffusion of a flame.

  The caulking material 1 having the above structure is obtained by, for example, co-extrusion of a material (non-foamed EPDM) constituting the water stop portion 2 and a material (thermal expansion type plastic refractory material) constituting the joint forming portion 3. It is manufactured by a method of integral molding.

  Next, the usage method of the caulking material 1 is demonstrated.

  First, as shown in FIG. 3, the caulking material 1 is pasted via a double-sided adhesive tape 4 to a portion S1 along the circumferential direction inside the end face of the segment 11 and a portion S2 along the axial direction, that is, the joint portion 30 of the segment 11. Keep it. The surface to which the caulking material 1 is attached is the end surface of the segment 11. The segment 11 to which the above caulking material 1 is adhered is transported to a shield tunnel construction site.

  And when assembling the segment 11 in the shield method, as shown in FIG. 5 and FIG. 6, when the end surfaces of the two segments 11 are abutted, the water stop portion 2 of the caulking material 1 becomes the end surface (joint portion) of the segment 11. 30 is compressed by the joint inner surface 31) to ensure the water-stopping property of the segment joint portion, and the joint forming portion 3 is formed in the gap between the segment end surfaces (between the joint inner surface 31 of the joint portion 30) formed inside the tunnel. Is filled.

  At the time of segment assembly, the butting force in the circumferential direction of the segment 11 and the butting force in the axial direction of the segment 11 are given by, for example, a shield jack (not shown) mounted on the shield machine.

  As described above, according to the caulking material 1 of this embodiment, in addition to the original effect of the caulking material that fills the gap between the segment end faces formed on the tunnel inner side (segment inner side), the inside of the tunnel It is possible to achieve the effect that it is possible to reliably prevent the water (such as sewage) from leaching out of the segment junction to the outside of the tunnel. Furthermore, the caulking material 1 of this embodiment is made of a thermally expandable plastic refractory material in which the joint forming part 3 has flame retardancy. Can be applied.

  Here, in the above embodiment, the joint forming part 3 of the caulking material 1 is made of a thermally expandable plastic refractory material, but instead of this, the joint is made of CPE (chlorinated polyethylene) or CR flame retardant. The forming unit 3 may be configured. The CR flame retardant is chloroprene rubber or the like.

  In the structure shown in FIGS. 4 to 6, the joint inner surface 31 of the joint portion 30 of the segment 11 is a straight surface without an inclined surface, and the joint forming portion 3 of the caulking material 1 is used as the joint inner surface 31 of the joint portion 30. However, the present invention is not limited to this, and as shown in FIGS. 7 and 8, an inclined surface is formed on the joint inner surface 31 ′ of the joint portion 30 ′ of the segment 11 ′. The joint forming portion 3 ′ of the caulking material 1 ′ may have a shape (tapered shape) matching the joint inner surface 31 ′ of the joint portion 30 ′. With such a structure, it is possible to effectively prevent the displacement or dropout of the joint forming portion 3 ′ toward the tunnel inner side. Further, since the joint forming part 3 'and the water stop part 2' are integrally formed, the positional deviation of the water stop part 2 'can be prevented.

  Further, in the above embodiment, the joint forming part 3 is composed of the thermal expansion type plastic refractory material alone, but instead of this, as shown in FIG. 9, the water stop part (unfoamed EPDM) 202 is integrated. The joint forming portion 203 to be formed has a two-layer structure of a main body portion 231 and a surface layer 232 that covers the surface of the main body portion 231, the main body portion 231 is made of foamed EPDM, and the surface layer 232 is made of a thermally expandable plastic refractory material. It may be configured. Furthermore, the joint formation part 3 is good also as a structure of three or more layers. However, the outermost layer is made of a thermally expandable plastic refractory material (or CPE, CR flame retardant).

  Further, in addition to the above configuration, as shown in FIG. 10, a flame retardant sheet in which a flame retardant material such as CPE, CR flame retardant or a thermal expansion plastic refractory material is formed into a sheet shape on the inner surface of the segment 11. 6 may be pasted.

  Next, another example of the caulking material attaching method will be described.

  First, as shown in FIG. 11, when there is a corner portion (for example, a segment with an invert groove) in the arrangement portion (sticking portion) S <b> 12 of the caulking material on the end face of the segment 12, as shown in FIG. If the method of sticking 1 at a right angle or the method of making a 45 degree cut at the end of the caulking material 1 and pasting the cut ends as shown in FIG. Good.

  Further, as shown in FIG. 13, a caulking material 101 (integrated product) having a shape corresponding to the arrangement portion (attachment portion) S12 of the caulking material on the end face of the segment 12 is manufactured in advance in a factory or the like, and the caulking material is produced. You may employ | adopt the method of sticking 101 to the end surface of the segment 12 in a construction site etc. In this case, since the cutting operation of the caulking material is not required at all, the workability is greatly improved and the water-stopping property is also increased.

  Further, as shown in FIG. 14, an L-shaped caulking material 111 (corner-corresponding product: including a U-shaped shape) matched to a corner portion present in the caulking material arrangement portion S12 on the end surface of the segment 12 is preliminarily provided. A method may be adopted in which the caulking material 111 is manufactured in a factory or the like and the caulking material 111 is attached to the end face of the segment 12 at a construction site or the like. In this case, the workability is improved because it is not necessary to perform the coking material matching operation at the corners.

  In the caulking material 101 (integrated product) in FIG. 13 and the caulking material 111 (corresponding to the corner portion) in FIG. 14, the corner joint is, for example, two caulking materials (straight members) that are joined together. Molding is performed by placing them in a mold and bonding them together by injecting the same resin (for example, EPDM) as the caulking material into a bonding surface of the caulking material and causing a chemical reaction.

  Next, another embodiment of the caulking material will be described with reference to FIGS.

[About the caulking material in FIG. 16]
First, when the segments are assembled, as shown in FIG. 15, among the plurality of segments 11... 11 constituting the segment ring 10 for one ring, the segment 11 to be assembled last is compared with the assembled segment group. Need to be slid and placed. For this reason, the caulking material affixed to the last segment 11 may be slid by the caulking material of another segment, and a twist, a wrinkle, etc. may generate | occur | produce in a caulking material. In order to prevent such a point, in the present invention, in the segment ring 10 for one ring, the caulking material 301 having the structure shown in FIG. 16 is used as the caulking material for the segment 11 to be assembled last.

  The caulking material 301 shown in FIG. Specifically, the water stop portion 302 includes an oil impregnated layer 321 in which one of the two surfaces pressed by the segment end surface is impregnated with an oil component having lubricating performance, and the other surface. The side has a two-layer structure constituted by an adhesion layer 322 not impregnated with oil.

  And by using the caulking material 302 in which the water stop portion 302 is composed of two layers in this way, when the segment to be assembled at the end is inserted and arranged, the contact portion between the caulking materials becomes slippery, It is possible to prevent twisting and wrinkling.

[About the caulking material in FIG. 17]
The caulking material 401 in this example is a band-shaped member in which a water stop portion 402 and a joint formation portion 403 are integrally formed. The water stop portion 402 is made of a water-expandable material, and the joint formation portion 403 is a heat-generating member. It is characterized in that it is composed of an inflatable plastic refractory material.

  According to the caulking material 401 of this example, after completion of shield construction such as caulking material pasting → segment assembly, the water-swellable material constituting the water-stopping portion 402 expands due to the reaction with the groundwater and has a water-stopping property. Secured. The gap between the segment end faces formed on the inner side of the segment is filled with the joint forming part 403 (thermal expansion type plastic refractory material) as in the above-described embodiment (FIG. 6).

  Here, the caulking material for a shield segment of the present invention is a shield segment for constructing various tunnels such as a sewer tunnel, a tunnel for waterworks, a tunnel for roads and railways, or a tunnel for electric power / energy. Can be used as a caulking material.

  The caulking material of the present invention is used to construct a tunnel such as a sewer pipe by the secondary lining integrated shield method that omits the secondary lining. It can be effectively used to prevent leaching.

It is a perspective view which shows typically the example of the shield tunnel constructed | assembled by the shield construction method which abbreviate | omitted secondary lining. It is sectional drawing which shows the structure of the junction part of a segment. It is a perspective view which shows the caulking material sticking position of a segment. It is a figure which writes and shows together the front view (A) and longitudinal cross-sectional view (B) which show the structure of embodiment of the caulking material for shield segments of this invention. It is a figure which shows typically the use condition of the caulking material for segments of FIG. It is a figure which shows typically the use condition of the caulking material for segments of FIG. It is a figure which shows typically other embodiment of the caulking material for shield segments of this invention in use condition. It is a figure which similarly shows other embodiment by a use condition similarly. It is a longitudinal cross-sectional view which shows the structure of another embodiment of the caulking material for shield segments of this invention. It is a figure which shows typically the other example of the use condition of the caulking material for segments of FIG. It is a front view which shows the caulking material sticking position of a segment. It is explanatory drawing of the sticking method of the caulking material for segments. It is a front view which shows the structure of another embodiment of the caulking material for shield segments of this invention. It is a front view which shows the structure of another embodiment of the caulking material for shield segments of this invention. It is explanatory drawing of the assembly procedure of a segment. It is a longitudinal cross-sectional view which shows the structure of another embodiment of the caulking material for shield segments of this invention. It is a longitudinal cross-sectional view which shows the structure of another embodiment of the caulking material for shield segments of this invention.

Explanation of symbols

1 Caulking material (caulking material for shield segment)
2 Water stop part 21 One surface of the water stop part 22 Other side of the water stop part 3 Joint forming part 4 Double-sided adhesive tape 10 Segment ring 11 Segment (shield segment)
S1, S2 Caulking material sticking position 20 Sealing portion 30 Joint portion 31 Joint inner surface 101,111 Caulking material (caulking material for shield segment)
12 segment (shield segment)
S12 Application position of caulking material 202 Water stop part 203 Joint forming part 231 Main body part (foamed EPDM)
232 Surface layer (thermal expansion type plastic refractory material)
201 Caulking material (caulking material for shield segment)
302 Water stop portion 321 Oil impregnated layer 322 Adhesion layer 303 Joint forming portion 401 Caulking material (caulking material for shield segment)
402 Water-stop part (water-swellable material)
403 Joint formation part T Shield tunnel

Claims (5)

  In the shield method that constructs the wall of the tunnel by sequentially assembling the segments along the inner wall of the excavation part behind the shield machine while excavating the ground with the shield machine, it is placed between the end faces of the adjacent segments. The caulking material, wherein the water stop portion and the joint forming portion are integrally formed, and the water stop portion is made of a material having physical properties that can ensure water stop performance against water inside the tunnel, A caulking material for a shield segment, characterized in that the joint forming portion is made of CPE, CR-based flame retardant or a thermal expansion type plastic refractory material.   The caulking material for a shield segment according to claim 1, wherein the water stop portion is made of non-foamed EPDM, SBR, or a water-swellable material.   3. The caulking for a shield segment according to claim 1, wherein the joint forming part is composed of a plurality of layers, and the outermost layer is composed of CPE, a CR-based flame retardant or a thermal expansion plastic refractory material. Wood.   The said water stop part is shape | molded in any one of the two surfaces pressed by the segment end surface in convex shape, The Claim 1 characterized by the above-mentioned. Caulking material for shield segment. The water stop portion is composed of a layer impregnated with an oil component having a lubricating performance on one of the two surfaces pressed by the segment end surface, and the other surface side is impregnated with the oil component. The shield segment caulking material according to any one of claims 1 to 4, wherein the shield segment caulking material is formed of a non-layer.

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