JP4646501B2 - Caulking material for shield segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
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.
[0003]
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.
[0004]
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).
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-220999
[Problems to be solved by the invention]
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.
[0007]
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.
[0008]
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.
[0009]
[Means for Solving the Problems]
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 faces of the segments adjacent to each other, and is characterized in that the water stop portion and the joint forming portion are integrally formed.
[0010]
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 surfaces are butted together, the water stop portion of the caulking material is compressed at the segment end surface to ensure water stoppage, and the gap between the segment end surfaces formed inside the segment is filled at the joint forming portion. The
[0011]
In the caulking material for the shield segment of the present invention, it is preferable that the water stop portion and the joint forming portion are made of materials having different physical properties. Specifically, the water stopping part is made of a material with physical properties that can ensure water stopping performance against the water inside and outside the tunnel, and the joint forming part has physical properties that can fill the gaps between the segment end faces formed on the tunnel inner side. It is preferable that it is comprised with the material of.
[0012]
[Water stop part]
Specifically, it is preferable that the water-stop part is made of a non-foamed material, and in particular, the water-stop part is considered to have water resistance, anti-corrosion against sewage (chemical resistance), deformation followability, etc. It is preferably composed 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.
[0013]
(Improved water stoppage)
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.
[0014]
(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.
[0015]
(Join 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.
[0016]
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.
[0017]
[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.
[0018]
In addition, when the joint formation part is a foam material, considering the adhesiveness with the water stop part, when the material of the water stop part is non-foamed 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, as another material of a joint formation part, a modified | denatured silicon + epoxy resin or unsaturated polyester resin etc. can be mentioned.
[0019]
[Method of manufacturing caulking material for shield segment]
As a method for producing a caulking material for a shield segment of the present invention, for example, (1) by co-extrusion of a resin ( non-foamed resin) constituting a water stop part and a resin ( foamed resin) constituting a joint forming part The method of integral molding, or (2) the water stopping part and the joint forming part are extruded separately, and the water stopping part and the joint forming part are bonded to each other by bonding or heat fusion after the extrusion molding process. The method of pasting together can be mentioned.
[0020]
The shape of the caulking material should just be shape | molded according to the arrangement | positioning part of the caulking material of the said segment end surface, but if it is a stepping box shape (refer FIG. 10), it will not come out to an inner surface side. The water-stopping property is ensured permanently (within the service life).
[0021]
[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), 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.
[0022]
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.
[0023]
According to the caulking material for shield segment of this invention, when the end surfaces of the segments are brought into contact with each other at the time of assembling the segment, the water stop portion (non-foamed EPDM, etc.) of the caulking material is compressed at the end surface of the segment to ensure water stoppage. Is done. In addition, since the water-swellable material constituting the joint forming part expands due to the reaction with the groundwater, the gap between the segment end faces formed on the inner side of the tunnel is filled with the expanded rubber. Water-stopping property can be ensured.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
First, the segments used in the secondary lining integrated shield method will be described.
[0026]
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.
[0027]
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.
[0028]
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.
[0029]
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.
[0030]
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.
[0031]
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 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 may be formed with an inclined surface that shrinks toward the inside of the segment in a state where the end surfaces of the two segments 11 are in contact with each other, or between the two surfaces of the joint inner surface 32 ′. A straight shape (see FIG. 8) with a constant width dimension may be used.
[0032]
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.
[0033]
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.
[0034]
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.
[0035]
The joint forming portion 3 has a shape that matches the joint inner surface 32 (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 32 of the joint portion 30 without a gap. Has been.
[0036]
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. As the material for the joint forming portion 3, foamed EPDM having a physical property of 35 ± 5 according to JIS K-6253 is used.
[0037]
The caulking material 1 having the above structure is integrally formed by, for example, co-extrusion of a resin ( non-foamed EPDM) constituting the water stop portion 2 and a resin ( foamed EPDM) constituting the joint forming portion 3. Produced by the method.
[0038]
Next, the usage method of the caulking material 1 is demonstrated.
[0039]
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 end surface of the segment 11.
[0040]
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 brought into contact with each other as shown in FIGS. 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).
[0041]
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.
[0042]
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.
[0043]
In addition, regarding the caulking material 1 of the present embodiment, the shape of the joint forming portion 3 is tapered so as to decrease toward the inside of the segment, thereby effectively shifting the position of the joint forming portion 3 toward the inside of the tunnel or dropping off. Can be prevented. 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.
[0044]
Here, in the structure shown in FIGS. 3 to 5, an inclined surface is formed on the joint inner surface 32 of the joint portion 30 of the segment 11, and the joint forming portion 3 of the caulking material 1 is matched with the joint inner surface 32 of the joint portion 30. However, the present invention is not limited to this, and as shown in FIGS. 7 to 9 , the joint inner surface 32 ′ of the joint portion 30 ′ of the segment 11 ′ is a straight surface without an inclined surface. The joint forming portion 3 'of the caulking material 1' may have a straight shape that matches the joint inner surface 32 'of the joint portion 30'.
[0045]
Next, another example of the caulking material attaching method will be described.
[0046]
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.
[0047]
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.
[0048]
Furthermore, as shown in FIG. 14, an L-shaped caulking material 111 (corner-corresponding product) that matches the corners present in the caulking material arrangement portion S12 on the end surface of the segment 12 is manufactured in advance in a factory or the like. The caulking material 111 may be applied to the end surface 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.
[0049]
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.
[0050]
Next, another embodiment of the caulking material will be described with reference to FIGS.
[0051]
[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 201 having the structure shown in FIG. 16 is used as the caulking material for the segment 11 to be assembled last.
[0052]
The caulking material 201 shown in FIG. 16 is characterized by the structure of the water stop portion 202. Specifically, the water stop portion 202 is configured by an oil impregnated layer 221 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 222 that is not impregnated with oil.
[0053]
And by using the caulking material 201 in which the water stop portion 202 is configured in two layers in this way, when the segment to be assembled at the end is inserted and arranged, the sliding of the contact portion between the caulking materials becomes good, and the caulking material It is possible to prevent twisting and wrinkling.
[0054]
[About the caulking material in FIG. 17]
The caulking material 301 in this example is a band-shaped member in which a water stop portion 302 and a joint forming portion 303 are integrally formed. The water stop portion 302 is made of a water-expandable material, and the joint forming portion 303 is foamed. It is characterized in that it is composed of EPDM (physical properties: for example, hardness according to JIS K-6253 is 35 ± 5).
[0055]
According to the caulking material 301 of this example, after completion of shield construction such as caulking material pasting → segment assembly, the water-swellable material constituting the water-stopping portion 302 expands due to the reaction with the groundwater and has a water-stopping property. Secured. In addition, the gap between the segment end surfaces formed on the inner side of the segment is filled in the joint forming portion 303 (foamed EPDM), as in the above-described embodiment (FIG. 6).
[0056]
[About caulking material in FIG. 18]
The caulking material 401 in this example is a band-shaped member in which a water stop portion 402 and a joint forming portion 403 are integrally formed, and the water stop portion 402 is non-foamed EPDM (physical properties: hardness according to JIS K-6253, for example). Is characterized in that the joint forming part 403 is made of a water-swellable material.
[0057]
According to the caulking material 401 of this example, after the shield construction such as caulking material pasting → segment assembly is completed, the water-expandable material constituting the joint forming part 403 expands due to the reaction with the groundwater. The gap between the segment end faces formed on the side is filled with the expanded rubber, and in addition to this caulking function, water blocking is also exhibited. In addition, in the water stop part 402 of the caulking material 401, it compresses by the end surface (compression surface 31 of a joint part) like the above-mentioned embodiment (FIG. 6), and the water stop of a segment junction part is ensured. The
[0058]
Here, the caulking material for the shield segment of the present invention is a shield segment for constructing various types of 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 a caulking material.
[0059]
【The invention's effect】
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 it 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.
[Brief description of the drawings]
FIG. 1 is a perspective view schematically showing an example of a shield tunnel constructed by a shield method in which secondary lining is omitted.
FIG. 2 is a cross-sectional view showing a structure of a joint portion of a segment.
FIG. 3 is a perspective view showing a caulking material sticking position of a segment.
FIG. 4 is a view showing both a front view (A) and a longitudinal sectional view (B) showing a configuration of an embodiment of a caulking material for a shield segment of the present invention.
FIG. 5 is a diagram schematically showing a state in which the caulking material of FIG. 4 is used.
6 is a diagram schematically showing a state of use of the caulking material of FIG.
FIG. 7 is a view showing both a front view (A) and a longitudinal sectional view (B) showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
FIG. 8 is a diagram schematically showing a state in which the caulking material of FIG. 7 is used.
FIG. 9 is a diagram schematically showing a state in which the caulking material of FIG. 7 is used.
FIG. 10 is a longitudinal sectional view showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
FIG. 11 is a front view showing a caulking material sticking position of a segment.
FIG. 12 is an explanatory diagram of a method for attaching a caulking material.
FIG. 13 is a front view showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
FIG. 14 is a front view showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
FIG. 15 is an explanatory view of a segment assembly procedure;
FIG. 16 is a longitudinal sectional view showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
FIG. 17 is a longitudinal sectional view showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
FIG. 18 is a longitudinal sectional view showing the configuration of another embodiment of the caulking material for shield segment of the present invention.
[Explanation of symbols]
1 Caulking material (caulking material for shield segment)
2 Water-stopping part 21 One surface 22 of the water-stopping part The other surface of the water-stopping part 3 Joint forming part 4 Double-sided adhesive tape 10 Segment ring 11 Segment (shield segment)
S1, S2 Caulking material application position 20 Seal portion 30 Joint portion 31 Compression surface 32 Joint inner surface 101,111 Caulking material (caulking material for shield segment)
12 segment (shield segment)
S12 Caulking material sticking position 201 Caulking material (caulking material for shield segment)
202 Water stop portion 221 Oil impregnated layer 222 Adhesion layer 203 Joint forming portion 301 Caulking material (caulking material for shield segment)
302 Water-stop part (water-swellable material)
303 Joint forming part 401 Caulking material (caulking material for shield segment)
402 Water-stop part 403 Joint formation part (water-swellable material)
T shield tunnel

Claims (4)

  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 water stop portion and the joint forming portion are integrally formed, and the water stop portion is one of the two surfaces pressed by the segment end surface. A shield segment caulking material, characterized in that the side is composed of a layer impregnated with an oil component having lubricating performance, and the other surface is composed of a layer not impregnated with the oil component.   The caulking material for a shield segment according to claim 1, wherein the water stop portion is made of non-foamed EPDM or a water-swellable material. 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. A caulking material, wherein the water stop portion and the joint forming portion are integrally formed, and the joint forming portion is used to fill the tunnel inner side of the gap formed between the segment end faces, the waterproof part is non-foamed EPD is composed of M, shield segments for caulking material, characterized in that the joint forming portion is composed of foamed EPDM. 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. A caulking material, wherein the water stop portion and the joint forming portion are integrally formed, and the joint forming portion is used to fill the tunnel inner side of the gap formed between the segment end faces, The water stop portion has one of the two surfaces pressed by the segment end surface, the shape of one surface is formed into a convex shape, an adhesive is disposed on the other surface, and the water stop portion is water unit, non-foamed EPD is composed of M, shield segments for caulking material, characterized in that the joint forming portion is composed of foamed EPDM.

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