JP4693368B2 - Caulking material for shield segment - Google Patents

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).

  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.

In consideration of the above points, Patent Document 2 discloses a caulking material disposed between end surfaces of adjacent segments as a caulking material for a shield segment that can prevent leaching to the outside of the tunnel, A shield segment caulking material or the like is disclosed in which a portion and a joint forming portion are integrally formed.
JP 2001-220999 A Japanese Patent Application No. 2003-148109

  However, according to the inventor's study, the caulking material can fill a gap between segment end faces formed on the tunnel inner side, and water inside the tunnel leaches out of the tunnel from the segment junction. However, it is not always easy to cope with variations in gaps between the end faces of the segments and the bent portions, and further improvement in workability has been demanded.

  The present invention has been made in consideration of such points, and it is possible to prevent the water inside the tunnel from leaching out of the tunnel from the segment joint, and the variation in the gap between the segment end faces and the bent portion The purpose is to provide a caulking material for shield segments that is easy to handle and excellent in workability.

The caulking material for a shield segment according to claim 1 is a shield that constructs a wall of a tunnel by sequentially assembling the segments along the inner wall surface of the excavation part behind the shield machine while excavating the ground with a shield machine. In the construction method, it is a strip-shaped caulking material arranged between the end faces of the segments adjacent to each other, and a water stop portion made of a non-foam material and a joint forming portion made of a foam material are integrally formed, inside the waterproof part及beauty eyes fabric forming section, sequentially in the longitudinal direction of the caulking material, and having a hollow portion of the cross section flat.

Below, the present invention will be described in detail.

  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 the gap between the segment end faces regulated on the segment inner face side is Filled at the joint forming part.

Moreover, as shown in FIG. 4, the interior of the water stopper及beauty eyes fabric forming section, sequentially in the longitudinal direction of the caulking material, because it has a hollow portion of the cross section flat, to ensure excellent waterproof It is possible to reliably prevent the water inside the tunnel from leaching out of the tunnel from the segment junction. Furthermore, it is possible to prevent water outside the tunnel from leaching into the tunnel from the segment joint, making it easy to handle variations in the gaps between the end faces of the segments and the bent portions, and has excellent workability. .

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

In shield segments for caulking material of the present invention, the inside of the water stopper及beauty eyes fabric forming section, sequentially in the longitudinal direction of the caulking material, by providing the hollow portion of the cross section flat, the end faces of the segments when the butt, waterproof part及beauty th place forming part of the caulking material is easily deformed along the end face, it is possible to increase the water cut of the segment junctions, gap variations and bends between segments end face It becomes easy to cope with.

A gas or a liquid may be injected into the hollow portion. By the pressure and viscosity of the gas and liquid in this case, the water stopper及beauty th place forming part tends to reliably deformed along the end face, preferably in that it enables the suitability of the repulsive force against the end face.

  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.

  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.

  The joint forming part may be composed of a plurality of materials having different hardnesses. Specifically, as illustrated in FIG. 5, only the periphery of the hollow portion has a higher hardness than the other portions, for example, a high hardness foamed material or a non-foamed material that is configured in a layered manner. In this case, the joint forming portion is preferably easily deformed along the end face, and the repulsive force against the end face can be optimized.

The foam material of the high hardness, for example, a material having a relatively high hardness among materials such as foamed EPDM or SBR used in the water stopper及beauty th place forming unit. Specifically, the hardness is preferably about 50 to 60 degrees.

  In this invention, it is preferable that the shape of the any one surface is shape | molded convexly among the 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.

  As a manufacturing method of the caulking material for shield segment of the present invention, for example, (1) a material (unfoamed resin: for example, non-foamed EPDM) constituting the water stop portion and a material (foamed resin: for example) constituting the joint forming portion (2) The water-stopping part and the joint-forming part are extruded separately, and the water-stopping part and the joint are formed later in the extrusion process. For example, a method in which the formation part is bonded to each other by adhesion or heat fusion can be used.

Shield segments for caulking material of the present invention, together with a waterproof part and the joint forming portion is formed integrally with, the interior of the waterproof part及beauty eyes fabric forming section, continuous in the longitudinal direction of the caulk In addition, since it has a hollow section with a flat cross section, it is possible to prevent water inside the tunnel from leaching out of the tunnel from the segment joint portion, and when the end faces of the segments are butted together , the waterproof part及beauty th place forming part of the caulking material is easily deformed along the end face, corresponding to the variation or bends of the gap between the segments end face becomes excellent in easy workability.

The water stopper及beauty th place forming portion is composed of a plurality of materials with different hardness, for example, when the periphery of the hollow portion is constituted by a high hardness layer, water stopper及beauty th land formed The portion can easily be reliably deformed along the end surface, and the repulsive force with respect to the end surface can be made appropriate, so that the above effect is further ensured.

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

  First, the segment used for the 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 used for the shield method is a secondary lining integrated type segment made of concrete and 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) having an excavating blade at the tip is propelled laterally into the ground, and the rear of the shield machine When the space for one ring of the segment ring 10 is formed, 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 space behind the shield machine. Next, in the same way, the shield machine is propelled for 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 compact shield method as described above, the segments 11 adjacent to each other are connected to each other by a joining method such as joining by a connecting bolt, joining by concavity and convexity fitting, or joining using a connecting metal fitting.

  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 four end surfaces of the segment 11 (refer FIG. 3). Further, as shown in FIG. 2, a compression surface 31 and a joint inner surface 32 that are orthogonal to the axial direction of the segment are formed in the joint portion 30 of the segment 11. The joint inner surface 32 is formed with an inclined surface such that the width dimension between the two surfaces decreases toward the inside of the segment in a state where the end surfaces of the two segments 11 are abutted with each other.

  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 formation portion 3 are integrally formed, and has hollow portions 2 a and 3 a inside the water stop portion 2 and the joint formation portion 3. . 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 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 part 3 has a shape that matches the joint inner surface 32 (FIG. 2) of the joint part 30 of the segment 11 and is formed into a tapered shape that decreases in thickness as it goes toward the tip part (inside the segment). Furthermore, the joint forming part 3 is processed into a shape and size so as to contact the substantially entire surface of the joint inner surface 32 of the joint part 30 without a gap in a state where the joint forming part 3 is disposed on the joint part 30 of the segment 11.

  As the material of the water stop part 2, EPDM (unfoamed) having a physical property of 55 ± 5 according to JIS K-6253 is used. Further, EPDM (foamed) having a physical property of 35 ± 5 according to JIS K-6253 is used as the material for the joint forming portion 3.

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

In the following, shield segments for caulking material of the present invention (hereinafter, referred to as caulking material) will be described below with reference to FIG. 5 another example of.

  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 caulking material 1 has a hollow portion 3a inside the joint forming portion 3, and the periphery of the hollow portion 3a has a hardness. It is composed of a high layer 3b (hereinafter also referred to as a “high hardness layer”). The water stop portion 2 and the joint forming portion 3 are made of materials having different physical properties, and the joint forming portion 3 is made of two kinds of materials having different hardnesses in the high hardness layer 3b and other portions.

  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 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 part 3 has a shape that matches the joint inner surface 32 (FIG. 2) of the joint part 30 of the segment 11 and is formed into a tapered shape that decreases in thickness as it goes toward the tip part (inside the segment). Furthermore, the joint forming part 3 is processed into a shape and size so as to contact the substantially entire surface of the joint inner surface 32 of the joint part 30 without a gap in a state where the joint forming part 3 is disposed on the joint part 30 of the segment 11.

  As the material of the water stop part 2, EPDM (unfoamed) having a physical property of 55 ± 5 according to JIS K-6253 is used. As the material for the joint forming part 3, EPDM (unfoamed) having a physical property of 55 ± 5 according to JIS K-6253 is used as the high hardness layer 3b, and the other parts have the same hardness of 30 ± 5. EPDM (foamed) having physical properties of ± 5 is used.

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

  Next, a method for using the caulking material 1 will be described using the caulking material 1 shown in FIG. 4 as an example.

  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 inner circumferential direction of the end surface 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 two end surfaces of the segment 11.

  Next, when assembling the segment 11 in the shield method, the release paper of the double-sided pressure-sensitive adhesive tape 4 is peeled off, and the end surfaces of the two segments 11 are butted together as shown in FIGS. 6 and 7. By this segment abutment, the water stop portion 2 of the caulking material 1 is compressed at the end surface of the segment 11 (the compression surface 31 of the joint portion 30) to ensure the water stop of the segment joint portion and is formed inside the tunnel. The joint forming portion 3 is filled in the gap between the segment end faces (between the joint inner surfaces 32 of the joint portions 30).

  At the time of assembling the segment, 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 the present 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, since the shape of the joint forming part 3 is a tapered shape that decreases toward the inside of the segment, the position of the joint forming part 3 toward the inside of the tunnel of the joint forming part 3 Or, it can be prevented from falling off. Furthermore, since such joint formation part 3 and the water stop part 2 are formed integrally, the position shift of the water stop part 2 can also be prevented.

  In addition, 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, and a tunnel for electric power / energy. Can be used as caulking material.

It is a perspective view which shows typically the example of the shield tunnel constructed | assembled with the compact shield construction method. 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 together and shows the front view (A) and longitudinal cross-sectional view (B) which show an example of embodiment of the caulking material for shield segments which concerns on this invention. Front view showing a reference example of sheet over a shield segment caulk (A) and longitudinal sectional view of (B) is a view showing also shown. It is a schematic diagram explaining the use condition of the caulking material for shield segments. It is a schematic diagram explaining the use condition of the caulking material for shield segments similarly.

1 Caulking material (caulking material for shield segment)
2 Water stop portion 2a Hollow portion 21 One surface 22 of the water stop portion The other surface 3 of the water stop portion 3 Joint forming portion 3a Hollow portion
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 Compression surface 32 Joint inner surface T Shield tunnel

Claims (1)

In the shield 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 striped caulking material,
A water stop portion made of a non-foamed material, with a joint forming portion made of a foam material is formed integrally with, the interior of the waterproof part及beauty eyes fabric forming section, continuous in the longitudinal direction of the caulk And a caulking material for a shield segment, characterized by having a hollow section having a flat cross section.

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