JP2005256563A - Caulking member for shield segment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water in a tunnel from oozing to the outside in a segment joint part when constructing the tunnel of sewer by a compact shield method (without secondary lining). <P>SOLUTION: A clearance between end faces of a segment 11 is buried using a caulking member 1 constituted by forming a water cut-off part 2 for securing water cut-off performance for water in the tunnel and a joint forming part 3 constituted of a material filling the clearance between the end faces of the segment 11 formed inside the tunnel integrally and providing self seal parts 21, 22 having lips 21a, 22a and, 22b pressed against the segment end faces by the action of water pressure in the water cut-off part 2 in a joint part of the segments 11 to increase water resistant performance for internal and external water pressure in 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 disposed between the end surfaces of the adjacent segments, wherein the water stop portion and the joint forming portion are integrally formed, and the water pressure acts on the water stop portion, thereby the segment. A self-sealing part having a lip part pressed against the end face is provided.

For example, 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. And when the end faces of the segments are butted together during the segment assembly, the water stop portion of the caulking material is compressed to the segment end face to ensure water stoppage, and there is a gap between the segment end faces regulated on the segment inner face side. Filled at the joint forming part.

  Moreover, since the self-sealing part having a lip part pressed against the segment end surface by the action of water pressure is provided in the water stop part, excellent waterproofness can be secured, and the water inside the tunnel is released from the segment joint part. It can be surely prevented from leaching out of the tunnel. Furthermore, it is possible to prevent water outside the tunnel from leaching out of the segment junction into the tunnel.

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, it is preferable that the water stop portion is made of a non-foamed material. In particular, considering the anti-corrosion (chemical resistance), deformation followability, etc. against water pressure, sewage, etc., non-foamed EPDM (copolymer of ethylene, propylene and third component) or SBR (styrene and butadiene) (Copolymerized product).

-Improved water-stop-
In the caulking material for a shield segment of the present invention, the water-stopping property of the segment joint portion is enhanced by providing the water-stopping portion with a self-sealing portion having a lip portion pressed against the end face of the segment by the action of water pressure. The self-sealing part of the water stop part may be provided on either or both of the tunnel inner side and the tunnel outer side. If the self-sealing portion is provided outside the tunnel, it is possible to prevent water from the outside of the tunnel from entering the inside of the tunnel from the segment joint portion.

-Adhesion to segments-
You may arrange | position the adhesive agent in any one surface among the two surfaces pressed by the segment end surface in the said water stop part. When the adhesive is provided on one surface of the water stop portion in this way, 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.

[Joint formation part]
The joint forming portion is not particularly limited as long as it is a material that can fill the gaps between the segment end faces, but a foam material or a water-swellable material is preferable.

  In addition, when the joint formation part is a foam material, considering the adhesiveness of the water stop part, for example, when the material of the water stop part is unfoamed EPDM or SBR, the same type of material, that is, foamed EPDM or SBR However, it is preferable that the material has different physical properties such as hardness.

  In addition, when CPE (chlorinated polyethylene), CR flame retardant or thermal expansion plastic refractory material is used as the material of the joint forming part, it is applied to the caulking of the inner surface of the segment requiring fire countermeasures such as a subway. be able to.

  The CR flame retardant is chloroprene rubber or the like.

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 due to heat at the time of a fire and preventing the penetration and diffusion of a flame.

[Method of manufacturing caulking material for shield segment]
Examples of the method for producing the caulking material for the shield segment of the present invention include (1) a material constituting the water stop portion (unfoamed resin: for example, non-foamed E PDM) and a material constituting the joint forming portion (foamed resin). : For example, foamed EPDM or the like) is integrally molded by co-extrusion, or (2) The water-stopping portion and the joint-forming portion are individually extruded, and the water-stopping portion is later in the extrusion process. And the joint forming part may be bonded to each other by adhesion or heat fusion.

[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 (see FIG. 12) in the arrangement portion (applying portion) of the caulking material on the end surface of the segment (see FIG. 12), 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.

  The shield segment caulking material of the present invention is a joint formation formed of a material having physical properties capable of filling a gap between a water stop portion that secures water stop performance against water inside the tunnel and a segment end surface formed on the tunnel inner side. Because it is a structure formed integrally with the part, in the shield method that does not perform secondary lining, it can be used for the joint part of the segment to fill the gap between the segment end faces formed on the tunnel inner side it can. Moreover, since the self-sealing part having a lip part pressed against the end face of the segment by the action of water pressure is provided in the water stop part, excellent waterproofness can be secured, and the water inside the tunnel can be removed from the segment joint part. It can be surely prevented from leaching out of the tunnel. It is also possible to prevent water outside the tunnel from leaching into the tunnel from the segment junction.

  Furthermore, since the caulking material for shield segment 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 behind, the propulsion of the shield machine is stopped, and the segments 11.. 11 are assembled in a ring shape along the inner wall surface of the rear space of the shield machine. 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, joint inner surfaces 31 and 32 that are orthogonal to the axial direction of the segment are formed on the joint portion 30 of the segment 11. A concave portion 31a having a trapezoidal cross section is formed at a position corresponding to a water stop portion 2 of the caulking material 1 to be described later.

  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 a water stop portion 2 and a joint forming portion 3 are integrally formed. A double-sided pressure-sensitive adhesive tape 4 is attached to one side of the caulking material 1.

  Non-foamed EPDM having a physical property of 55 ± 5 according to JIS K-6253 is used as the material for the water stop portion 2. The water stop part 2 is a member having a substantially drum shape in cross section, and is provided with an inner self seal part 21 and an outer self seal part 22.

  The inner self-seal part 21 has a lip part 21a. An inclined surface F1 is formed on the lip portion 21a, and the lip 21a is pressed outward when water pressure (internal water pressure) acts on the inclined surface F1.

  The outer self-sealing portion 22 has a pair of lip portions 22a and 22b. The pair of lip portions 22a and 22b are formed with inclined surfaces F2a and F2b facing each other, and the lip portions 22a and 22b are outward (separated from each other) when water pressure acts on the inclined surfaces F2a and F2b. It is designed to be pressed toward the direction of

  Foamed EPDM having a physical property of 35 ± 5 according to JIS S K-6253 is used as the material for the joint forming part 3. The joint forming portion 3 has a shape that matches the joint inner surfaces 31, 32 (FIG. 2) of the joint portion 30 of the segment 11, and has a shape that makes contact with substantially the entire joint inner surfaces 31, 32 of the joint portion 30 without a gap.・ Processed to dimensions.

  The caulking material 1 having the above structure is integrally formed by, for example, co-extrusion of a material (non-foamed EPDM) constituting the water stop portion 2 and a material (foamed EPDM) constituting the joint forming portion 3. Produced by the method.

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

  First, as shown in FIG. 3, the caulking material 1 is attached to the joint S30 along the circumferential direction S1 and the axial direction S2 along the circumferential direction of the end face of the segment 11 with the double-sided adhesive tape 4. deep. 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.

  Then, when assembling the segment 11 in the shield method, as shown in FIGS. 5 and 6, when the end surfaces of the two segments 11 are abutted, the water stop portion 2 becomes the end surface of the segment 11 (the joint inner surface of the joint portion 30). 31, 32) to secure the water-stopping property of the segment joint portion, and to the gap between the segment end surfaces formed on the tunnel inner side (between the joint inner surface 31 and the joint inner surface 32 of the joint portion 30). The joint forming part 3 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.

  Moreover, in the caulking material 1 of this embodiment, when the internal water pressure (water pressure due to the water inside the tunnel) acts on the water stop portion 2, the lip portion 21 a of the inner self-seal portion 21 is Since the inner surface 31 (the bottom surface of the recess 31a) is pressed with a strong force, the water-stopping property against water inside the tunnel is improved. Further, when external water pressure (water pressure due to water outside the tunnel) acts on the pair of lip portions 22a and 22b of the outer self-sealing portion 22, the pair of lip portions 22a and 22b of the outer seal portion 22 are segmented by the external water pressure, respectively. 11 is pressed with a strong force against the joint inner surface 31 (the bottom surface of the recess 31a) and the joint inner surface 32, so that the water stoppage against water on the outside of the tunnel is also improved.

  And by using the caulking material 1 having such a self-sealing structure, the water-stopping performance can be increased to 1 MPa, for example, compared with about 0.3 MPa at the past.

  5 and 6, the caulking material 1 is disposed only at the joint portion 30 of the segment 11, but as illustrated in FIG. 7, it is also disposed at the seal portion 120 on the outer side of the segment 11. May be. If it does in this way, the water resistance performance with respect to the internal water pressure and external water pressure of the junction part of the segment 11 can be improved further.

Here, in the above embodiment, the joint forming part 3 of the caulking material 1 is made of foamed EPDM. Instead, CPE (chlorinated polyethylene), CR flame retardant, or thermally expandable plastic is used. You may comprise the joint formation part 3 with a refractory material. By configuring the joint forming part 3 with a material having flame retardance as described above, it is possible to apply to the caulking of the inner surface of the segment that requires fire countermeasures such as a subway.

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

  The caulking material 201 shown in FIG. 8 has a structure in which a water stop portion (for example, made of unfoamed EPDM) 202 and a joint formation portion (for example, made of foamed EPDM) 203 are integrally formed. There are provided an inner self-seal part 221 having a pair of lip parts 221a and 221b inclined in a direction away from each other and an outer self-seal part 222 having a pair of lip parts 222a and 222b inclined in a direction away from each other. There is a feature.

  The caulking material 301 shown in FIG. 9 has a structure in which a water stop part (for example, made of unfoamed EPDM) 302 and a joint forming part (for example, made of foamed EPDM) 303 are integrally formed, and the water stop part 302 is flat. A feature is that the base portion 320 and the self-sealing portion 321 having one lip portion 321a inclined obliquely with respect to the base portion 320 are integrally formed.

  The caulking material 401 shown in FIG. 10 has a structure in which a water stop portion (for example, made of unfoamed EPDM) 402 and a joint forming portion (for example, made of foamed EPDM) 403 are integrally formed. The self-sealing portion 421 having a pair of lip portions 421a and 421b that incline in directions away from each other is formed on the circular water-stopping portion main body 420.

  A caulking material 501 shown in FIG. 11 has a structure in which a water stop portion (for example, made of unfoamed EPDM) 502 and a joint formation portion (for example, made of foamed EPDM) 503 are integrally formed, and the water stop portion 502 is flat. The self-sealing part 522 having one lip part 522a inclined in a direction away from each other is formed integrally with a sealing part main body 521 having a shape standing from a simple base part 520.

  Since the caulking materials 201 to 501 having the structures shown in FIGS. 8 to 11 also adopt the self-sealing structure, it is necessary to ensure an excellent water pressure resistance (for example, about 1 MPa) against the internal water pressure and the external water pressure. Can do.

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

  First, as shown in FIG. 12, when there is a corner in the caulking material arrangement portion (sticking portion) S12 on the end face of the segment 12 (for example, a segment with an invert groove), 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. 14, a caulking material 101 (integrated product) having a shape matching the arrangement portion (attachment portion) S12 of the caulking material on the end surface 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. 15, an L-shaped caulking material 111 (corner-corresponding product: also including a U-shaped shape) that matches the corner portion present in the caulking material arrangement portion S12 on the end face of the segment 12 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 addition, in the caulking material 101 (integrated product) in FIG. 14 and the caulking material 111 (corresponding to the corner portion) in FIG. 15, the joint at the corner portion is, for example, two caulking materials (straight members) to be joined to each other. 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.

  Here, the caulking material for the 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 another use condition of the caulking material for segments of FIG. It is a longitudinal cross-sectional view which shows the other example of the caulking material for shield segments. It is a longitudinal cross-sectional view which shows the other example of the caulking material for shield segments. It is a longitudinal cross-sectional view which shows the other example of the caulking material for shield segments. It is a longitudinal cross-sectional view which shows the other example of the caulking material for shield segments. 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.

Explanation of symbols

1 Caulking material (caulking material for shield segment)
2 Water-stop part 21 Inner self-seal part 21a Lip part 22 Outer self-seal part 22a, 22b Lip part 3 Joint formation part 4 Double-sided adhesive tape 10 Segment ring 11 Segment (shield segment)
S1, S2 Application position of caulking material 20 Seal part 30 Joint part 31, 32 Joint inner surface

Claims (5)

  In the shield construction method that constructs the wall of the tunnel by sequentially assembling the segments along the inner wall surface of the excavation part behind the shield machine while excavating the ground with the shield machine, it is arranged between the end faces of the adjacent segments. A self-comprising caulking material having a water stop portion and a joint forming portion integrally formed, and having a lip portion pressed against the end face of the segment when water pressure acts on the water stop portion A caulking material for a shield segment, wherein a seal portion is provided.   The caulking material for a shield segment according to claim 1, wherein the water stop portion is made of a non-foaming material.   The caulking material for a shield segment according to claim 1 or 2, wherein the water stop portion is made of non-foamed EPDM or SBR.   The said joint formation part is comprised with the foam material or the water expansible material, The caulking material for shield segments in any one of Claims 1-3 characterized by the above-mentioned. The said joint formation part is comprised with foamed EPDM, The caulking material for shield segments in any one of Claims 1-4 characterized by the above-mentioned.

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