JP7142437B2 - Laying method of freezing pipe - Google Patents

Description

The present invention relates to a method for laying frozen pipes.

In Patent Document 1, for the purpose of effectively utilizing a cylindrical gap called a tail void between the outer peripheral surface of the shield tunnel body and the excavated ground, the tail void is filled with a backfill material, and cable piping is installed. from the inner space of the shield machine toward the tail void, and burying the cable pipes in the backfilling material in the tail void.

Patent Literature 1 exemplifies a heat exchange pipe of a heat pump, a communication cable, a power supply cable, a measurement cable, and the like, as cable piping to be buried in the tail void.

By the way, one of the ground improvement methods when constructing a shield tunnel by the shield construction method is to solidify the ground by circulating a refrigerant through freezing pipes attached to the tunnel lining of the shield tunnel and freezing the soil containing groundwater. A ground freezing method is known (see Patent Document 2). Patent Literature 2 discloses a freezing method in which an outer pipe is installed near the surface of a segment, and a traction measure holding a refrigerant circulation pipe and an inner pipe are pulled to freeze the ground in a predetermined frozen section.

JP 2017-075486 A JP 2016-160717 A

Here, if the technique described in Patent Document 1 is applied as a method for laying the frozen pipe, there is a risk that the frozen pipe buried in the tail void will meander and the installation position of the frozen pipe will become unstable. be. In this case, the ground improvement range is not stable, and the quality of the frozen soil formed by circulating the refrigerant in the freezing pipe deteriorates.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to lay a frozen pipe at a predetermined position with high accuracy.

A method for laying a frozen pipe according to the present invention constructs a tunnel lining body along the inner peripheral surface of an excavation hole excavated by an excavator by assembling a plurality of segment pieces inside the excavator, The frozen pipe wound inside is sent out, and the frozen pipe is laid in the recess provided in the outer peripheral part of the tunnel lining.

A method for laying a frozen pipe according to the present invention comprises constructing and winding a tunnel lining body along the inner peripheral surface of an excavated hole excavated by an excavator by assembling a plurality of segment pieces inside an excavator. The frozen pipe thus prepared is sent out, and inside the excavator, the frozen pipe is laid on the outer peripheral surface of the tunnel lining via an adhesive. Further, in the method for laying a frozen pipe according to the present invention, a tunnel lining body is constructed along the inner peripheral surface of an excavation hole excavated by an excavator by assembling a plurality of segment pieces inside the excavator, After sending out the frozen pipe wound inside the excavator toward the face side of the excavation, it is sent out toward the side opposite to the face of the excavation, and the frozen pipe is stretched along the outer peripheral surface of the tunnel lining. Laying.

A method for laying a frozen pipe according to the present invention comprises constructing and winding a tunnel lining body along the inner peripheral surface of an excavated hole excavated by an excavator by assembling a plurality of segment pieces inside an excavator. The frozen pipe is laid out along the outer peripheral surface of the tunnel lining, and a predetermined tension is applied to the frozen pipe via rollers that feed the frozen pipe toward the tunnel lining. The frozen tube is straightened , and an adhesive is applied to the straightened frozen tube .

ADVANTAGE OF THE INVENTION According to this invention, a frozen pipe can be laid in a predetermined position precisely.

1 is a cross-sectional view of an underground structure; FIG. FIG. 4 is a front view of a segment ring that constitutes the outer shell shield; FIG. 4 is an exploded view of a segment ring that constitutes the outer shell shield; FIG. 4B is a cross-sectional view of the A-shaped segment piece, showing a cross-section along line IVa-IVa of FIG. 4B; FIG. 4B is a rear view of the A-type segment piece viewed from direction IVb of FIG. 4A; FIG. 4 is a cross-sectional view taken along line VV of FIG. 3, showing an enlarged attachment portion of the freezing tube to the outer shell shield according to the first embodiment; 4 is a cross-sectional view taken along line VI-VI of FIG. 3; FIG. 1 is a schematic configuration diagram of a shield excavator; FIG. It is a schematic diagram which expands and shows the rear part of the tail part of a shield excavator. FIG. 4 is a schematic diagram showing a cryo-pipe laying device arranged in the tail. It is a schematic diagram which shows the structure of an adhesive coating device. It is a schematic diagram for demonstrating the laying method of the frozen pipe by the shield excavator which concerns on 1st Embodiment. FIG. 8 is an enlarged cross-sectional view showing an attachment portion of a freezing tube to an outer shell shield according to a second embodiment; FIG. 11 is an enlarged cross-sectional view showing a mounting portion of a freezing tube to an outer shell shield according to a third embodiment; FIG. 11 is a vertical cross-sectional view of the outer shell shield showing the installation positions of the freezing pipes according to the fourth embodiment, showing an enlarged view of the joints of the segment rings adjacent in the tunnel axial direction. It is a schematic diagram for demonstrating the laying method of the frozen pipe by the shield excavator which concerns on 4th Embodiment. FIG. 11 is a vertical cross-sectional view of the outer shell shield showing the installation positions of the freezing pipes according to the fifth embodiment, showing an enlarged connection portion of segment rings adjacent in the tunnel axial direction.

Hereinafter, a method for laying a frozen pipe according to an embodiment of the present invention will be described with reference to the drawings.

<First embodiment>
FIG. 1 is a cross-sectional view of an underground structure 1. FIG. As shown in FIG. 1, when constructing an underground structure 1 such as a branching/merging section where a plurality of roads diverge/merge, a plurality of outer shell shields 100 are constructed around the underground structure 1 . The plurality of outer shell shields 100 are constructed with the preceding outer shell shields 100a constructed at predetermined intervals, and the preceding outer shell shields 100a overlapped between the preceding outer shell shields 100a adjacent in the circumferential direction. and a row shell shield 100b. Since the leading outer shell shield 100a and the trailing outer shell shield 100b have the same configuration, they will be collectively referred to as the outer shell shield 100 below and the structure thereof will be described. The shell shield 100 is a tunnel lining body that lines an excavation hole excavated by a shield excavator 110 (see FIG. 7), which will be described later.

FIG. 2 is a front view of the segmented ring 101 that constitutes the outer shell shield 100, and FIG. FIG. 3 shows a developed view in which a plurality of segment rings 101 are deployed in the tunnel circumferential direction. That is, FIG. 3 shows a developed view of the outer shell shield 100. As shown in FIG. As shown in FIG. 3, the outer shell shield 100 is constructed by connecting a plurality of segment rings 101 in the axial direction of the tunnel. The tunnel circumferential direction refers to the circumferential direction of the outer shell shield tunnel formed by repeating excavation and assembly of the segment pieces 102 by the shield excavator 110 (see FIG. 7). The tunnel axial direction refers to the central axial direction of the outer shell shield tunnel. The tunnel radial direction refers to the diameter direction of the outer shell shield tunnel.

As shown in FIG. 2, the segment ring 101 includes one K-shaped segment piece 102k arranged vertically above, a pair of B-shaped segment pieces 102b arranged to sandwich the K-shaped segment piece 102k, and a pair of and a plurality of A-shaped segment pieces 102a disposed between B-shaped segment pieces 102b. The A-type segment piece 102a, the B-type segment piece 102b, and the K-type segment piece 102k are steel segment pieces 102 that constitute the segment ring 101, respectively. Each segment piece 102 is connected to a circumferentially adjacent segment piece 102 .

As shown in FIG. 3, the A-shaped segment piece 102a has a constant circumferential length (arc length). The K-shaped segment piece 102k has a circumferential length (arc length) that gradually decreases from the face side (left side in the drawing) of the tunnel toward the entrance side (right side in the drawing). The B-shaped segment piece 102b has a circumferential length (arc length) that gradually increases from the face side of the tunnel (left side in the drawing) toward the portal side (right side in the drawing).

FIG. 4A is a cross-sectional view of the A-shaped segment piece 102a, showing a cross-section along line IVa-IVa of FIG. 4B. FIG. 4B is a rear view of the A-shaped segment piece 102a viewed from direction IVb of FIG. 4A. As shown in FIGS. 4A and 4B, the A-type segment piece 102a includes a pair of main girders 104, a pair of joint plates 103, a skin plate 106, and a plurality of longitudinal ribs 105.

The pair of joint plates 103 are arranged apart from each other in the tunnel circumferential direction. The joint plate 103 functions as a connecting plate that is connected to the joint plates 103 of the segment pieces 102 adjacent in the tunnel circumferential direction. The joint plate 103 is provided with a bolt insertion hole 103h through which a bolt that penetrates in the tunnel circumferential direction and fastens the joint plates 103 of the segment pieces 102 that are adjacent in the tunnel circumferential direction is inserted. While the joint plates 103 of the segment pieces 102 adjacent in the tunnel circumferential direction are in contact with each other, a bolt is inserted into the bolt insertion hole 103h and a nut is screwed onto the bolt, whereby the segment pieces adjacent in the tunnel circumferential direction are assembled. 102 are connected. A seal member 190 (see FIG. 5) is provided between the pair of joint plates 103 that abut against each other, and the seal member 190 closes the gap between the pair of joint plates 103 .

As shown in FIG. 2 , a segment ring 101 is formed by arranging a plurality of segment pieces 102 in an annular shape and connecting adjacent segment pieces 102 with joint plates 103 .

As shown in FIGS. 4A and 4B, the main girder 104 is an arc-shaped plate member extending in the tunnel circumferential direction. The main girder 104 is a side plate of the segment piece 102 that bears earth pressure, water pressure, and the like.

The pair of main girders 104 are arranged apart from each other in the tunnel axial direction (tunnel extending direction). A pair of main girders 104 are arranged parallel to each other. The main girder 104 functions as a connecting plate that is connected to the main girder 104 of the segment piece 102 adjacent in the tunnel axial direction. The main girder 104 is provided with a bolt insertion hole 104h through which a bolt that penetrates in the tunnel axial direction and fastens the main girder 104 of the segment pieces 102 that are adjacent in the tunnel axial direction is inserted. While the main girders 104 of the segment pieces 102 adjacent in the tunnel axial direction are in contact with each other, a bolt is inserted into the bolt insertion hole 104h and a nut is screwed onto the bolt, thereby separating the segment pieces adjacent in the tunnel axial direction. 102 are connected. A seal member (not shown) is provided between the pair of main girders 104 that abut against each other, and the gap between the pair of main girders 104 is closed by the seal member (not shown).

Thereby, as shown in FIG. 3, the segment rings 101 adjacent to each other in the tunnel axial direction are connected. The plurality of segment rings 101 are positioned such that adjacent segment rings 101 in the tunnel axial direction are circumferentially displaced, that is, the segment pieces 102 are arranged in a zigzag pattern. This prevents the joint plates 103 from being aligned in the axial direction of the tunnel. Although only two types of arrangement patterns are shown in FIG. 3, the outer shell shield 100 can be constructed by combining three or more types of arrangement patterns.

As shown in FIGS. 4A and 4B, the skin plate 106 is a plate that closes the opening on the ground side of the frame formed by the pair of main girders 104 and the pair of joint plates 103. The skin plate 106 is a plate that closes the opening on the ground side of the frame formed by the pair of main girders 104 and the pair of joint plates 103. prevent intrusion. The skin plate 106 is connected to the main girder 104 and the joint plate 103 by welding.

The longitudinal ribs 105 are support members that bear the propulsion force of the shield excavator 110 . The segment rings 101 are arranged so that the vertical rib 105 (see FIGS. 4A and 4B) of one segment ring 101 adjacent in the tunnel axial direction is aligned with the position of the vertical rib 105 or joint plate 103 of the other segment ring 101. be done. By arranging in this way, the axial force can be appropriately transmitted to each segment ring 101 arranged along the tunnel axial direction.

In this embodiment, the vertical rib 105 has an L-shaped cross section, but it can have various cross-sectional shapes such as an I-shape and a T-shape. The longitudinal rib 105 extends from one of the pair of main girders 104 toward the other and is fixed to the pair of main girders 104 and the skin plate 106 by welding.

As shown in FIG. 3 , freezing pipes 141 are laid in outer shell shield 100 composed of a plurality of segment rings 101 . Refrigerant is supplied to the freezing pipe 141 in a freezing process described later. Frozen soil can be formed around the outer shell shield 100 by circulating the refrigerant through the freezing pipe 141 to freeze the groundwater-containing soil. As indicated by the two-dot chain line in FIG. 3, the frozen pipe 141 is laid along the tunnel axial direction. In this embodiment, four freezing pipes 141 are laid along the tunnel axial direction at predetermined intervals in the tunnel circumferential direction.

5 and 6, the installation position of the freezing pipe 141 laid on the outer shell shield (tunnel lining) 110 will be described. FIG. 5 is a cross-sectional view taken along the line VV in FIG. 3, and also shows an enlarged view of the attaching portion of the freezing tube 141 to the outer shell shield 100. As shown in FIG. FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 3, showing an enlarged view of the VI portion of FIG. 4A.

FIG. 5 shows the installation structure of the freezing pipe 141 at the connecting portion of a pair of A-shaped segment pieces 102a adjacent in the tunnel circumferential direction, and FIG. showing the structure.

The installation structure (not shown) of the freezing pipe 141 at the connecting portion of the A-type segment piece 102a and the B-type segment piece 102b adjacent in the tunnel circumferential direction is the same as the installation structure shown in FIG. 5, so the explanation is omitted. do. Also, the installation structure (not shown) of the freezing tube 141 at the circumferential center of the B-shaped segment piece 102b is the same as the installation structure shown in FIG. 6, so the description is omitted.

As shown in FIGS. 5 and 6 , the freezing pipe 141 is laid in recesses 120 a and 120 b provided on the outer peripheral portion of the outer shell shield 100 . The plurality of segment rings 101 arranged along the tunnel axial direction are arranged with a predetermined distance in the circumferential direction, as described above. In this embodiment, since the segment rings 101 are arranged in two types of arrangement patterns, the segment rings 101 are formed with two types of recesses 120a (see FIG. 5) and recesses 120b (see FIG. 6).

The recessed portion 120a and the recessed portion 120b are formed so as to be continuous when the segment rings 101 are connected. Thereby, the recesses 120a and 120b of each segment ring 101 are arranged linearly along the tunnel axis direction. Since the frozen pipes 141 are accommodated in the recesses 120a and 120b, they are laid in a straight line along the axial direction of the tunnel. Hereinafter, the recess 120a and the recess 120b are collectively referred to as the recess 120 as well.

When the segment rings 101 are arranged in three or more types of arrangement patterns, the concave portions 120 are formed corresponding to the types of arrangement patterns. Each recess 120 is formed so as to be continuous when a plurality of segment rings 101 are connected. Thereby, the concave portions 120 of each segment ring 101 are arranged linearly along the tunnel axis direction. Therefore, a freezing pipe 141, which will be described later, can also be laid in a straight line.

As shown in FIGS. 5 and 6 , the freezing tube 141 is fitted into recesses 120 a and 120 b provided on the outer peripheral portion of the outer shell shield 100 . The concave portions 120a and 120b have bottom surfaces 121a and 121b and a pair of side surfaces 122a and 122b rising from the bottom surfaces 121a and 121b.

As shown in FIG. 5, the bottom surface 121a of the recessed portion 120a is composed of the end face of the joint plate 103 of one segment piece 102 adjacent in the tunnel circumferential direction and the end face of the joint plate 103 of the other segment piece 102 adjacent to the rock face. and One of the pair of side surfaces 122a of the recess 120a is formed by the end surface of the skin plate 106 of one segment piece 102 adjacent in the circumferential direction. The other of the pair of side surfaces 122b of the recess 120a is formed by the end surface of the skin plate 106 of the other segment piece 102 adjacent in the circumferential direction.

As shown in FIG. 6, the recess 120b provided in the circumferentially central portion of the segment piece 102 is formed by a pair of divided skin plates 106 and the vertical ribs 105. As shown in FIG. The bottom surface 121b of the recess 120b is formed by the end surface of the vertical rib 105 on the ground side. A pair of side surfaces 122b of the recessed portion 120b are formed by end surfaces of a pair of adjacent skin plates 106 facing each other.

As shown in FIGS. 5 and 6, the width of the recesses 120a and 120b in which the freezing tube 141 is accommodated, that is, the dimension between the pair of side surfaces 122a and 122b is slightly larger than the width of the freezing tube 141. As shown in FIGS. By minimizing the gap between the frozen tube 141 and the pair of side surfaces 122a and 122b of the recesses 120a and 120b, it is possible to suppress positional displacement of the frozen tube 141 in the tunnel circumferential direction. Therefore, the width of the recesses 120a and 120b is preferably 1.2 times or less the width of the freezing tube 141. As shown in FIG.

The freezing tube 141 is made of metal (for example, made of aluminum). The freezing tube 141 is a flat member having a rectangular cross-sectional shape and having a plurality of micro coolant flow paths 141a. The freezing tube 141 is a channel forming portion having a microchannel structure that forms a plurality of micro coolant channels 141a through which coolant flows.

In this embodiment, liquefied carbon dioxide is used as the refrigerant flowing through the minute refrigerant flow paths 141 a of the freezing tube 141 . Liquefied carbon dioxide is much less viscous than brines such as aqueous calcium chloride and sodium chloride solutions. Therefore, the resistance when the liquefied carbon dioxide flows through the minute refrigerant channels 141a of the freezing tube 141 is extremely small compared to brine. Therefore, the channel cross-sectional area of the minute refrigerant channel 141a of the freezing tube 141 can be made much smaller than when brine is used. Therefore, the thickness t of the freezing tube 141 can be made thinner than the thickness of the skin plate 106 (for example, about 5 mm). As a result, the entire freezing tube 141 can be accommodated within the recess 120 .

Since the freezing tube 141 is flexible and easily deformable in the plate thickness direction, it can be stored in the shield excavator 110 while being wound around the drum 171 as described later (Fig. 7).

As shown in FIGS. 5 and 6 , the opening surface of the recess 120 is covered with a rectangular plate-like (strip-like) cover 160 . The cover 160 regulates the outward movement of the frozen tube 141 accommodated in the recess 120 in the radial direction of the tunnel. A cover locking portion 161 for fixing the cover 160 is provided at the end of the skin plate 106 in the tunnel circumferential direction. The cover locking portion 161 is made of a plate-like member and fixed to the skin plate 106 by welding. The cover locking portions 161 of a pair of skin plates 106 adjacent in the tunnel circumferential direction are arranged so that their end faces face each other. The dimension between the pair of cover locking portions 161 arranged facing each other is set to be longer than the width of the freezing tube 141 .

A notch is provided at the end of the cover locking portion 161 so that the cross-sectional shape of the end is L-shaped. A concave portion 162 is formed by the notch portion and the outer peripheral surface of the skin plate 106 . Both ends of the cover 160 in the tunnel circumferential direction are fitted into the recesses 162 . The positions of the cover 160 installed in the concave portions 162 of the pair of cover locking portions 161 are defined by the cover locking portions 161 in the tunnel radial direction and the tunnel circumferential direction. The cover 160 is made of metal (for example, made of aluminum), has flexibility, and can be easily deformed.

The freezing tube 141 is housed in a rectangular housing space defined by the recess 120 and the cover 160 . Therefore, the cover 160 restricts the frozen pipe 141 from moving outward in the tunnel radial direction, and the concave portion 120 restricts it from moving radially inward and in the tunnel circumferential direction. That is, in the first embodiment, the recess 120 and the cover 160 allow the freezing tube 141 to be positioned with high accuracy.

The freezing pipe 141 is installed along the outer shell shield 100 when the shield excavator 110 excavates the ground and assembles the outer shell shield 100 as a tunnel lining body along the inner peripheral surface of the excavation hole. be done.

The configuration of the shield excavator 110 will be described with reference to FIG. FIG. 7 is a schematic configuration diagram of the shield excavator 110. As shown in FIG. As shown in FIG. 7 , the shield excavator 110 has an excavator main body 111 and a cylindrical tail portion 112 provided at the rear portion of the excavator main body 111 .

The excavator main body 111 includes a cylindrical body portion 113 , a cutter head 114 for excavation arranged at the front end portion of the main body portion 113 , and a partition (bulkhead) 115 arranged behind the cutter head 114 with a space therebetween. and have

The cutter head 114 is rotatably supported by the partition wall 115 . The cutter head 114 excavates the ground while rotating using a power unit 116 provided in the partition wall 115 as a drive source. A cutter chamber 117 is defined between the cutter head 114 and the partition wall 115 by these and the body portion 113 .

In the cutter chamber 117, excavated soil generated by excavation by the cutter head 114 stays. The shield excavator 110 is equipped with a screw conveyor 123 for carrying out the excavated earth and sand in the cutter chamber 117 . The screw conveyor 123 has a cylindrical case 123a and an auger 123b incorporated therein. By rotating the auger 123b, the excavated soil in the cutter chamber 117 is carried out to the rear of the partition wall 115. As shown in FIG.

The tail portion 112 includes a cylindrical outer shell 124, a support frame 129 that supports various devices, and an erector 126 as a segment assembly device. The erector 126 assembles segment pieces 102 having arcuate cross-sections to construct a cylindrical segmented ring 101 (see FIG. 2).

Between the excavator main body 111 and the tail portion 112, a plurality of center-folding jacks 118 are arranged at predetermined intervals in the circumferential direction. The folding jack 118 is a hydraulic jack composed of a cylinder and a rod. The rod end of the folding jack 118 is fixed to the front part of the tail part 112 , and the cylinder end of the folding jack 118 is fixed to the rear part of the excavator body 111 . The traveling direction of the shield excavator 110 can be changed by controlling the expansion and contraction of the folding jack 118 .

A plurality of shield jacks 125 are arranged along the periphery of the tail portion 112 at predetermined intervals in the circumferential direction so as not to interfere with the center-folding jacks 118 . The shield jack 125 is a hydraulic jack composed of a cylinder 125a and a rod 125b. The cylinder 125 a is fixed to the tail portion 112 , and the end of the rod 125 b contacts the existing segment ring 101 assembled inside the tail portion 112 . By extending the shield jack 125 in this state, the shield excavator 110 obtains propulsion force. Thus, the shield excavator 110 moves forward by the reaction force of the shield jack 125 pressing the existing segment ring 101 .

FIG. 8 is a schematic diagram showing an enlarged rear portion of the tail section 112 of the shield excavator 110. As shown in FIG. As shown in FIG. 8, a tail brush (tail seal) 128 is provided on the inner peripheral surface of the rear portion of the tail portion 112 to prevent water, soil, backfill material, etc. from entering the shield excavator 110 from the outside to the inside. is installed. The tail brush 128 is provided in multiple stages in the longitudinal direction of the shield excavator 110 . Each tail brush 128 is annularly provided on the inner peripheral surface of the cylindrical outer shell 124 that constitutes the tail portion 112 . The tail brush 128 is, for example, a metal wire brush or the like, and seals between the inner peripheral surface of the outer shell 124 and the outer peripheral surface of the segment ring 101 . The tail brush 128 moves along the outer peripheral surface of the segment ring 101 as the shield excavator 110 advances.

A tail void 180 is formed between the outer peripheral surface of the segment ring 101 behind the tail portion 112 and the inner peripheral surface (wall surface) of the excavation hole. The segment piece 102 is formed with an injection port (not shown) for injecting the back-filling material 181 into the tail void 180 . An injection pipe (not shown) is connected to this injection port, and the back-filling material 181 is injected into the tail void 180 . The backfilling material 181 is, for example, a fluid solidifying material containing cement and water glass.

When the shield excavator 110 excavates, the tail seal portion 183 between the tail brushes 128 is filled with a water-based sealant 182 . The water-based sealing material 182 prevents the backfilling material 181 and groundwater from entering the interior of the shield excavator 110 through the tail void 180 .

The sealing material 182 is, for example, water, bentonite, which is a silicate mineral containing 50% by weight or more of montmorillonite or kaolinite, water-soluble polymer thickener, sepiolite, and attapulgite. It comprises a sticky agent and an alkaline stimulant comprising at least one selected from sodium hydroxide, magnesium oxide, calcium hydroxide, hydrated, re-pulverized and dried cement, and fly ash. The sealing material 182 has thixotropy and nonflammability.

A configuration for laying the freezing tube 141 in the recess 120 of the segment ring 101 will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is a schematic diagram showing a frozen pipe laying device 170 arranged in the tail portion 112. Other components (the erector 126, the shield jack 125, the screw conveyor 123, etc.) arranged in the tail portion 112 are shown in FIG. , are omitted from the drawing. FIG. 10 is a schematic diagram showing the configuration of the adhesive application device 178. As shown in FIG.

As shown in FIG. 9, the shield excavator 110 includes a cryopipe laying device 170 within the tail section 112 . The freezing pipe laying device 170 sends out a drum 171 around which the freezing pipe 141 is wound, a storage unit 127 that houses a drum supporting device that rotatably supports the drum 171, and the freezing pipe 141 wound around the drum 171. and a delivery device (also a straightening device) 172 for correcting bending of the freezing tube 141, and an adhesive application device 178 for applying an adhesive 178d (see FIGS. 5 and 6) to the outer peripheral surface of the freezing tube 141. .

An adhesive applicator 178 is secured to the outer shell 124 of the tail section 112 . As shown in FIG. 10, the adhesive applicator 178 has a first through hole 178a and a second through hole 178c extending along the tunnel axis direction. The freeze tube 141 is inserted into the first through hole 178a, and the cover 160 is inserted into the second through hole 178c. The first through hole 178a is formed so as to face the opening end face of the recessed portion 120 of the assembled segment ring 101 in the tunnel axial direction. The second through hole 178c is formed so as to face the opening end face of the recessed portion 162 of the assembled segment ring 101 in the tunnel axial direction.

The first through hole 178 a is formed as a rectangular opening having a width slightly larger than the width of the freezing tube 141 and a height slightly larger than the thickness of the freezing tube 141 . Thereby, the freezing tube 141 can be guided to the recess 120 of the segment ring 101 with high accuracy.

The second through hole 178 c is formed as a rectangular opening having a width slightly larger than the width of the cover 160 and a height slightly larger than the thickness of the cover 160 . Thereby, the cover 160 can be guided between the pair of concave portions 162 of the segment ring 101 with high accuracy.

The adhesive applicator 178 is connected with a pipe 179 communicating with a tank (not shown) in which the adhesive 178d is stored. The adhesive applying device 178 is provided with a supply path 178b that connects the first through hole 178a and the pipe 179 . The adhesive 178 d is supplied from a tank (not shown) to the adhesive applicator 178 through a pipe 179 . The adhesive 178d supplied to the adhesive applicator 178 is guided to the first through hole 178a through the supply path 178b and applied to the entire outer peripheral surface of the freezing tube 141 inserted into the first through hole 178a.

The adhesive 178d is, for example, water, bentonite which is a silicate mineral containing 50% by weight or more of montmorillonite or kaolinite, water-soluble polymer thickener, sepiolite, and attapulgite. It comprises a sticky agent and an alkaline stimulant comprising at least one selected from sodium hydroxide, magnesium oxide, calcium hydroxide, hydrated, re-pulverized and dried cement, and fly ash. The adhesive 178d has thixotropy and nonflammability. It is preferable to select the same material as the sealing material 182 for the adhesive 178d.

Since the adhesive 178 d has tackiness and adhesiveness, it is possible to prevent the freezing tube 141 from being displaced within the recess 120 . By the way, if air is interposed between the inner peripheral surface of the concave portion 120 and the outer peripheral surface of the freezing pipe 141, there is a possibility that the freezing efficiency when forming frozen soil in the below-described freezing step may decrease. In contrast, in the present embodiment, the gap (gap) between the inner peripheral surface of the recess 120 and the outer peripheral surface of the freezing tube 141 can be filled with the adhesive 178d. Since the adhesive 178d has higher thermal conductivity than air, the freezing efficiency can be improved compared to the case where the adhesive 178d is not used.

As shown in FIG. 9, the accommodating portion 127 that accommodates the drum 171 around which the freezing tube 141 is wound is formed in a rectangular parallelepiped shape, and an opening through which the drum 171 is taken in and out is provided on the side surface. The drum 171 includes a cylindrical winding drum, and a pair of disk-shaped side plates coaxially disposed on both ends of the winding drum. The pair of side plates prevents the freezing tube 141 wound around the winding drum from coming off the winding drum. The center of the side plate is provided with a recess into which the support shaft of the drum support device is fitted. By fitting the support shaft of the drum support device into the recess, the drum 171 is rotatably supported by the drum support device around the central axis of the winding drum.

The delivery device 172 comprises multiple pairs of drive rollers 172a and multiple guide rollers 172b. The plurality of pairs of driving rollers 172a are rotationally driven by a driving device (not shown) such as a motor. The freezing tube 141 is supported while being sandwiched between the pair of drive rollers 172a. The feeding device 172 rotates one of the driving rollers 172a paired clockwise and the other counterclockwise to direct the freezing tube 141 toward the adhesive applying device 178 provided inside the tail portion 112. to be sent out.

The delivery device 172 presses the frozen tube 141 from both sides with a pair of drive rollers 172 a while applying a predetermined tension to the frozen tube 141 . As a result, the frozen tube 141 wound around the drum 171 is straightened after being pulled out from the drum 171 . Since the driving roller 172a and the guide roller 172b are installed on the path along which the freezing tube 141 travels from the storage unit 127 to the adhesive application device 178, the bending of the freezing tube 141 is gradually corrected.

As shown in the figure, the freezing tube 141 changes its advancing direction (delivery direction) at the driving roller 172a and the guide roller 172b. The frozen pipe laying device 170 according to the present embodiment is arranged so that the curvature of the frozen pipe 141 at the portion where the direction of movement is changed is smaller than the maximum value of the curvature of the frozen pipe 141 wound around the drum 171 . The number and arrangement of 172a and guide rollers 172b, tension applied to freezing tube 141, and the like are set.

By straightening the frozen pipe 141 delivered from the drum 171 toward the recessed portion 120 of the segment ring 101, the frozen pipe 141 can be laid along the tunnel axial direction. In the present embodiment, the freezing tube 141 is wound around the drum 171, but the freezing tube 141 may be wound in the shape of the letter 8 or in the shape of a bow. Even if the frozen tube 141 is wound in the shape of the letter 8 or in the shape of a bow, the delivered frozen tube 141 can be straightened by the delivery device (also a straightening device) 172 .

The freezing tube 141 is delivered from the drum 171 by the delivery device 172 and delivered from the first through hole 178 a of the adhesive application device 178 toward the recessed portion 120 of the segment ring 101 . An adhesive 178 d is applied to the freeze tube 141 passing through the first through hole 178 a of the adhesive applicator 178 . Therefore, at the tail clearance portion 176 between the inner peripheral surface of the outer shell 124 of the tail portion 112 and the outer peripheral surface of the segmented ring 101, the frozen tube 141 is adhered to the concave portion 120 of the segmented ring 101. installation is completed. That is, in the present embodiment, the freezing pipe 141 is completely laid in the recessed portion 120 of the segment ring 101 before reaching the tail void 180 . A method for laying the freezing pipe 141 will be described in detail below.

A method of laying the freezing pipe 141 by the shield excavator 110 will be described with reference to FIG. 11 . FIG. 11 is a schematic diagram for explaining a method of laying the frozen pipe 141 by the shield excavator 110 according to the first embodiment. The frozen pipe 141 is laid in the recessed portion 120 of the outer shell shield 100 by repeating the segment ring assembly process, the cover installation process, and the excavation process. The distal end portion of the freezing pipe 141 (the end portion opposite to the base end portion fixed to the drum 171) is previously fixed to a refrigerant circulation device 149 installed in the shaft 198 or the like.

－Segment ring assembly process－
In the segment ring assembling process, as shown in FIG. 11A , a plurality of segment pieces 102 are assembled inside the shield excavator 110, so that the segment rings are formed along the inner peripheral surface of the excavated hole by the shield excavator 110. A segmented ring 101 that forms part of the tunnel lining is constructed. In the segment ring assembling process, the segment pieces 102 are connected to form the segment ring 101, and the freezing pipe 141 is placed in the recess 120 of the segment ring 101 thus formed. One end of the freezing tube 141 is fixed to the refrigerant circulation device 149 and the other end is fixed to the drum 171 , and moderate tension is applied to the portion between the refrigerant circulation device 149 and the drum 171 .

The freeze tube 141 has a portion (hereinafter referred to as a linear portion) 141s that is linearly arranged from the recessed portion 120 of the existing segment ring 101a to the adhesive application device 178 . 178 d of adhesives are previously apply|coated by the adhesive application apparatus 178 to 141 s of this linear part. As shown in FIG. 11(b), the erector 126 moves the segment piece 102 to be held radially outward to arrange the linear portion 141s in the recess 120. As shown in FIG. Since the linear portion 141s of the freezing tube 141 is laid so as to fit in the recess 120, it is positioned with high accuracy.

A new segment ring 101b is completed by connecting the segment pieces 102 in the circumferential direction. The newly completed segmented ring 101b is also connected to the existing segmented ring 101a.

-Cover installation process-
In the cover installation step, as shown in FIG. 11C, the cover 160 is installed so as to cover the opening surface of the recess 120 of the new segment ring 101b. The length of the cover 160 is set equal to the axial length of the segment piece 102 . The cover 160 is inserted between the pair of recesses 162 along the tunnel axial direction from the outside of the segment piece 102 in the axial direction. The cover 160 is installed with a jig or the like so as to cover the opening surface of the recess 120 on the outside in the tunnel radial direction over the entire axial direction of the new segment ring 101b. As described above, cover 160 is flexible and easily deformable. Therefore, even if the work space is narrow, the installation work can be easily performed by bending the cover 160 in a bow shape.

－Excavation process－
In the excavation process, as shown in FIG. 11(d), the frozen pipe 141 is delivered by the delivery device 172 while the shield excavator 110 is advanced. A shield jack 125 is brought into contact with the newly completed segment ring 101b, and a driving force is applied to the shield excavator 110 by the shield jack 125 to move the shield excavator 110 forward.

The shield excavator 110 excavates (that is, excavates) the ground while moving forward. When the shield excavator 110 excavates by the axial distance of the segment ring 101b, the excavation ends.

When the shield excavator 110 is excavated, the segment ring 101 constituting a part of the tunnel lining is relatively pushed backward when the segment ring 101 is viewed from the shield excavator 110 with the shield excavator 110 as a reference. will be Inside the shield excavator 110 , the delivery device 172 delivers the frozen pipe 141 wound around the drum 171 as the shield excavator 110 advances. As a result, a linear portion 141 s is set across the new segment ring 101 b and the adhesive application device 178 . The linear portion 141s is laid in the recess 120 provided in the outer peripheral portion of the segment ring 101 assembled in the next segment ring assembly process.

The delivery device 172 delivers the freezing tube 141 by the same length as the amount of forward movement of the shield excavator 110 . In other words, when the shield excavator 110 is moved forward, the frozen pipe 141 as seen from the shield excavator 110 is delivered to the rear of the shield excavator 110 by the axial length of the segment ring 101b.

In the excavation process, the segment ring 101 with the frozen pipe 141 accommodated in the concave portion 120 is sealed by the tail brush 128 and pushed out behind the tail portion 112 by the shield jack 125 in a state in which water cutoff is ensured. After the end of excavation, the shield jack 125 is retracted.

By repeating the segment ring assembly process (see FIGS. 11(a) and 11(b)), the cover installation process (see FIG. 11(c)), and the excavation process (see FIG. 11(d)), the tunnel axis A freezing pipe 141 is laid on the outer peripheral portion of the outer shell shield 100 along the direction (extending direction of the outer shell shield 100).

As described above, in the method for laying the frozen pipe 141 according to the present embodiment, the linear portion 141s of the frozen pipe 141 is attached to the recessed portion 120 of the segment ring 101 at the tail clearance portion 176, and the shield jack 125 is used to move the frozen pipe 141. The attached segment ring 101 is pushed out behind the shield excavator 110. - 特許庁

Therefore, as described above, the segment ring 101 in which the freezing tube 141 is accommodated is pushed out behind the tail portion 112 by the shield jack 125 in a state where it is sealed in contact with the tail brush 128 and water cutoff is ensured. It will be. Accordingly, it is possible to prevent groundwater or the like from flowing into the inside of the shield excavator 110 during the process of laying the frozen pipe 141 .

Here, if the freeze tube 141 is arranged to protrude radially outward from the outer peripheral surface of the segment ring 101, the freeze tube 141 may come into contact with the tail brush 128 and the tail brush 128 may be damaged. On the other hand, in this embodiment, the freezing tube 141 is accommodated within the recess 120 without protruding from the recess 120 . That is, the freezing tube 141 is arranged inside the outermost peripheral surface of the segment ring 101 . Therefore, when the frozen pipe 141 is pushed out to the rear of the shield excavator 110 together with the segment ring 101, the tail brush 128 is prevented from being damaged due to the contact of the frozen pipe 141 with the tail brush 128.

Further, when the freezing tube 141 is arranged to protrude radially outward from the outer peripheral surface of the segment ring 101, the freezing tube 141 contacts the tail brush 128, and the tail brush 128 is bent by the freezing tube 141. Gaps may form. On the other hand, in this embodiment, the freezing tube 141 is accommodated within the recess 120 without protruding from the recess 120 . Therefore, when the frozen pipe 141 is fed to the rear of the shield excavator 110 , formation of a gap due to contact of the frozen pipe 141 with the tail brush 128 is prevented. Therefore, the seal function (water stop function) of the tail brush 128 is not impaired when the freezing tube 141 is sent out. Furthermore, in this embodiment, since the cover 160 is provided to cover the recess 120, formation of a gap between the segment ring 101 and the tail brush 128 is prevented. Thereby, the sealing performance by the tail brush 128 can be improved.

After the freezing pipe 141 has been laid on the outer shell shield 100, the freezing process is performed. In the freezing step, a refrigerant is supplied into the freezing pipe 141, and the refrigerant is circulated through the freezing pipe 141 to freeze soil containing groundwater, thereby solidifying the ground. Since the freezing tube 141 is attached to the outer shell shield 100 in a state of being accurately positioned within the recess 120, it is possible to form frozen soil within an appropriate range. Note that the adhesive 178 d is frozen in the freezing process, and the freezing tube 141 is firmly fixed within the concave portion 120 .

The freezing pipe 141 is thermally connected to the inner peripheral surface of the recess 120 via the adhesive 178d, and can efficiently cool the outer shell shield 100 and freeze the soil around the outer shell shield 100. can. After the freezing process is completed and the frozen soil is formed, the portion surrounded by the outer shield 100 and the frozen soil is excavated to construct the underground structure 1 (see FIG. 1).

According to the embodiment described above, the following effects are obtained.

Inside the shield excavator 110, the frozen pipe 141 wound around the drum 171 is sent out, and the frozen pipe 141 is laid in the recess 120 provided in the outer peripheral portion of the segment ring 101 that constitutes a part of the tunnel lining. I made it Therefore, the concave portion 120 allows the freezing pipe 141 to be laid at a predetermined position with high accuracy. Therefore, the frozen soil formed by the freezing process can be formed in an appropriate range.

<Second embodiment>
A mounting structure for a freezing tube 241 according to a second embodiment of the present invention will be described with reference to FIG. In the following, the points different from the first embodiment will be mainly described, and in the drawings, the same reference numerals will be given to the same or corresponding configurations as those described in the first embodiment, and the description will be omitted. . FIG. 12 is a view corresponding to the enlarged view of FIG. 5, and is a cross-sectional view showing an enlarged attachment portion of the freezing tube 241 to the outer shell shield 200 according to the second embodiment.

In the above-described first embodiment, the freeze tube 141 is configured as a coolant channel forming portion that forms the minute coolant channel 141a, and the cover 160 that covers the opening surface of the recess 120 is provided separately from the freeze tube 141. . On the other hand, in the second embodiment, a coolant channel forming portion 242 corresponding to the freezing tube 141 described in the first embodiment and a covering portion 243 corresponding to the cover 160 described in the first embodiment are provided. , are integrally formed.

As shown in FIG. 12, the freezing tube 241 has a coolant channel forming portion 242 and a cover portion 243 formed so as to protrude from the coolant channel forming portion 242 in the tunnel circumferential direction (horizontal direction in the drawing). . The protruding end of the covering portion 243 is fitted into a stepped portion 220 c formed at the opening edge of the recess 220 , and the opening surface of the recess 220 on the outside in the tunnel radial direction is covered with the freezing pipe 241 .

According to such a 2nd embodiment, in addition to the same effect as a 1st embodiment, there are the following effects.

Since the cover portion 243 that covers the opening surface of the concave portion 220 is provided integrally with the freezing tube 241, the cover installation step (see FIG. 11(c)) described in the first embodiment can be omitted. That is, in the second embodiment, the segment ring assembling process (see FIGS. 11A and 11B) and the excavation process (see FIG. 11D) are repeatedly performed to form the coolant flow path forming portion. A freezing tube 241 in which 242 and cover portion 243 are integrated can be laid in recess 220 . Therefore, the process of laying the frozen pipe 241 can be simplified, and the man-hours and cost of the laying work can be reduced.

<Third Embodiment>
A mounting structure of a freezing tube 341 according to a third embodiment of the present invention will be described with reference to FIG. In the following, the points different from the first embodiment will be mainly described, and in the drawings, the same reference numerals will be given to the same or corresponding configurations as those described in the first embodiment, and the description will be omitted. . FIG. 13 is a view corresponding to FIG. 6, and is a cross-sectional view showing an enlarged attachment portion of the freezing tube 341 to the outer shell shield 300 according to the third embodiment. 13(a) shows the state before the freezing tube 341 is accommodated in the recess 320, and FIG. 13(b) shows the state after the freezing tube 341 is accommodated in the recess 320. FIG.

As shown in FIG. 13A, the freezing tube 341 has a trapezoidal cross-sectional shape. Both end surfaces 341t of the freezing tube 341 in the tunnel circumferential direction are tapered surfaces in which the dimension between the end surfaces 341t (dimension in the tunnel circumferential direction) increases from the inner side to the outer side in the tunnel radial direction.

In the first embodiment, the joint plate 103 or the vertical rib 105 constitutes the bottom surfaces 121a and 121b of the recess 120 (see FIGS. 5 and 6). On the other hand, in the third embodiment, the skin plate 306 is formed with a recess 320 having a predetermined depth by cutting the outer peripheral surface of the skin plate 306 or the like. The concave portion 320 has a trapezoidal cross-sectional shape, similar to the freezing tube 341 . The recess 320 has a bottom surface 321 and inner side surfaces 322 obliquely extending from both ends of the bottom surface 321 in the tunnel circumferential direction. An inner side surface 322 of the recess 320 is tapered at the same angle as both end surfaces 341 t of the freezing tube 341 .

In the third embodiment, in the segment ring assembling process, the segment piece 302 is moved outward in the tunnel radial direction to fit the freezing tube 341 into the concave portion 320, as shown in FIG. 13(b). At this time, both end surfaces 341 t of the freezing tube 341 abut against the inner side surface 322 of the recess 320 . Thereby, the freezing tube 341 is attached to the segment ring 301 at a predetermined position with high accuracy.

According to such a 3rd embodiment, there exists an effect similar to a 1st embodiment. Furthermore, in the third embodiment, the cross-sectional shapes of the freezing tube 341 and the concave portion 320 are each formed in a trapezoidal shape, and the tapered surfaces are positioned in contact with each other. Therefore, it is possible to effectively prevent the freezing tube 341 from being displaced.

<Fourth Embodiment>
A mounting structure for a freezing tube 141 according to a fourth embodiment of the present invention will be described with reference to FIG. In the following, the points different from the first embodiment will be mainly described, and in the drawings, the same reference numerals will be given to the same or corresponding configurations as those described in the first embodiment, and the description will be omitted. . FIG. 14 is a vertical cross-sectional view of the outer shell shield 400 showing the installation positions of the freezing pipes 141 according to the fourth embodiment of the present invention, showing an enlarged view of the joints of the segment rings 101 adjacent in the tunnel axial direction.

In the first embodiment, an example in which the freezing pipe 141 is laid in the concave portion 120 provided in the outer peripheral portion of the outer shell shield 100 has been described. In contrast, in the fourth embodiment, the freezing pipe 141 is laid on the inner peripheral surface of the outer shell shield 100, which is the surface on the inner peripheral side. The main girder 104 is formed with an insertion opening 404a through which the freezing pipe 141 is inserted.

If the main girder 104 were not provided with the insertion opening 404a, it would be necessary to straddle the main girder 104 and connect the frozen pipes attached to the adjacent segment pieces 102 with a hose or the like. As a result, the work of laying the frozen pipe becomes complicated, which may lead to an increase in man-hours and cost. On the other hand, in the fourth embodiment, the freezing pipe 141 is laid through the insertion openings 404a provided in the pair of main girders 104 that connect the adjacent segment pieces 102 . As a result, the man-hours and cost of laying the frozen pipe 141 can be reduced.

Freeze tube 141 is fixed to the inner peripheral surface of skin plate 106 by means of mounting portion 480 fixed to skin plate 106 . A through-hole into which the freezing tube 141 is inserted is provided in the mounting portion 480 so as to penetrate in the tunnel axial direction. The freeze tube 141 extends in the tunnel axial direction, as in the first embodiment. Freezing tube 141 bends in the vicinity of main girder 104 so as to move away from the inner peripheral surface of skin plate 106 as it approaches main girder 104 . The freezing pipe 141 is inserted through an insertion opening 404 a provided in the main girder 104 .

The insertion opening 404a is provided closer to the tunnel center axis than the seal member 191 installed between the pair of main girders 104 connecting the segment pieces 102 adjacent in the tunnel axis direction. The seal member 191 is provided so as to block the gap between the pair of main girders 104 and prevents water or the like from entering the outer shell shield 100 from the outside of the outer shell shield 100 .

Referring to FIG. 15, a method for laying frozen pipe 141 by shield excavator 110 will be described. FIG. 15 is a schematic diagram for explaining a method of laying the frozen pipe 141 by the shield excavator 110 according to the fourth embodiment. As shown in FIGS. 15(a) and 15(b), a segment ring assembling step is performed in which the segment pieces 102 are connected by the erector 126 to form the segment ring 101. FIG. Next, as shown in FIG. 15C, an excavation step is performed in which the shield jack 125 is used to excavate the shield excavator 110 . The segment ring assembling process (see FIGS. 15(a) and 15(b)) and the excavation process (see FIG. 15(c)) are repeated, and a plurality of segments are separated by a predetermined distance (at least twice the length of the segment ring 101). segment rings 101 are connected. Thereafter, as shown in FIG. 15(d), the freezing tube 141 is delivered along the inner peripheral surface of the outer shell shield 100 by the delivery device 172 in the axial direction of the tunnel.

The operator easily attaches the frozen tube 141 to the inner peripheral surface of the segment ring 101 by pressing the frozen tube 141 coated with the adhesive 178d by the adhesive applicator 178 against the inner peripheral surface of the segment ring 101. be able to. When the freezing tube 141 is pasted, the freezing tube 141 is cut, and the segment assembly process is performed again. The freezing pipes 141 are attached to the inner peripheral surface of the segment ring 101 at predetermined distances, and the cut portions are separately connected by a hose or the like.

The freezing pipe 141 is installed so as to pass through the mounting portion 480 and the main girder 104 and extend in the tunnel axial direction. Since the adhesive 178d is applied to the frozen pipe 141 in advance by the adhesive applying device 178, as in the first embodiment, the number of man-hours for laying the frozen pipe 141 is reduced compared to the case where the adhesive 178d is applied manually. and cost can be reduced.

As described above, in the fourth embodiment, as in the first embodiment, by assembling a plurality of segment pieces 102 inside the shield excavator 110, the shield excavator 110 excavates along the inner peripheral surface of the excavated hole. An outer shell shield 400 is constructed as a tunnel lining body. In the fourth embodiment, inside the shield excavator 110 , the frozen pipe 141 wound around the drum 171 is sent out and laid on the inner peripheral surface of the outer shell shield 100 . Therefore, according to the fourth embodiment, the same effects as those of the first embodiment can be obtained.

Furthermore, the freezing pipe 141 is laid through an insertion opening (through hole) 404 a provided in a pair of main girders (connecting plates) 104 that connect the adjacent segment pieces 102 . Therefore, compared to the case where the insertion opening 404a is not provided in the main girder 104, the man-hours and costs for laying the freezing pipe 141 can be reduced.

An insertion opening 404 a through which the freezing tube 141 is inserted is provided inside the sealing member 191 . Therefore, the seal member 191 prevents water or the like from entering the inner side of the outer shell shield 100 from the outer side of the outer shell shield 100 through the insertion opening 404a.

<Fifth Embodiment>
A mounting structure for a freezing tube 141 according to a fifth embodiment of the present invention will be described with reference to FIG. In the following, the points different from the fourth embodiment will be mainly described, and in the drawings, the same reference numerals will be given to the same or corresponding configurations as those described in the fourth embodiment, and the description will be omitted. . FIG. 16 is a vertical cross-sectional view of the outer shell shield 500 showing the installation positions of the freezing pipes 141 according to the fifth embodiment of the present invention, showing an enlarged view of the joints of the segment rings 101 adjacent in the tunnel axial direction.

In the fourth embodiment, an example in which the insertion opening 404a is arranged radially inward of the seal member 191 has been described. In contrast, in the fifth embodiment, the insertion opening 504a is arranged radially outside the seal member 191 .

In the fifth embodiment, an annular seal ring 591 is provided radially outward of the insertion opening 504a. An annular seal groove is provided on the outer end surface of the main girder 104 in the tunnel axial direction, and a seal ring 591 is provided in this seal groove.

Thus, in the fifth embodiment, the seal ring 591 for sealing the gap between the pair of main girders 104 fastened by bolts and nuts is installed so as to surround the insertion opening 504a. This prevents water or the like from entering the outer shell shield 100 through the insertion opening 504a from the outer side of the outer shell shield 100, as in the fourth embodiment.

According to such a fifth embodiment, the same effects as those of the fourth embodiment can be obtained.

The following modifications are also within the scope of the present invention. It is also possible to combine the configurations described in the modifications.

<Modification 1>
In the above-described first embodiment, an example in which the cross-sectional shape of the freezing tube 141 is a flat rectangular shape is described, and in the above-described third embodiment, an example in which the cross-sectional shape of the freezing tube 341 is a flat trapezoidal shape is described. , the cross-sectional shape of the freezing tube is not limited to this. In each of the above embodiments, for example, the cryo-tube may be circular or elliptical. Also, the number of micro coolant channels is not limited to a plurality, and may be one. In other words, the freezing tube may be a single tube having one refrigerant flow path, or a double tube or triple tube having a plurality of refrigerant flow paths.

<Modification 2>
In the first embodiment described above, the example in which the first through-hole 178a and the second through-hole 178c are separately provided in the adhesive application device 178 has been described, but the present invention is not limited to this. One through-hole may be formed so as to connect the first through-hole 178a and the second through-hole 178c.

<Modification 3>
The sealing material 182 and the adhesive 178d are not limited to the materials described in the above embodiments. The adhesive 178d can also be omitted.

<Modification 4>
In the above embodiment, an example in which the present invention is applied to a shield tunnel formed by the shield excavator 110 has been described, but the present invention is not limited to this. The present invention may also be applied to tunnels formed by a TBM (Tunnel Boring Machine).

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of application examples of the present invention, and the technical scope of the present invention is not limited to the specific configurations of the above embodiments. do not have.

100, 200, 300, 400... outer shell shield (tunnel lining), 101, 301... segment ring (part of tunnel lining), 102, 302... segment piece (tunnel lining) Part of body), 104 Main girder (connection plate), 110 Shield excavator (excavator), 120,220,320 Recess 141,241,341 Frozen tube, 160... cover (cover portion), 171... drum, 243... cover portion, 404a, 504a... insertion opening (through hole)

Claims (6)

constructing a tunnel lining along the inner peripheral surface of an excavated hole excavated by the excavator by assembling a plurality of segment pieces inside the excavator;
A method of laying a frozen pipe, wherein a wound frozen pipe is sent out inside the excavator, and the frozen pipe is laid in a concave portion provided in an outer peripheral portion of the tunnel lining. Further comprising a covering portion covering the opening surface of the recess,
The method for laying a frozen pipe according to claim 1. constructing a tunnel lining along the inner peripheral surface of an excavated hole excavated by the excavator by assembling a plurality of segment pieces inside the excavator;
A method of laying a frozen pipe, wherein a wound frozen pipe is delivered, and the frozen pipe is laid on the outer peripheral surface of the tunnel lining via an adhesive in the inside of the excavator . constructing a tunnel lining along the inner peripheral surface of an excavated hole excavated by the excavator by assembling a plurality of segment pieces inside the excavator;
After sending the frozen pipe wound inside the excavator toward the face side of the excavation hole, it is sent out toward the side opposite to the face side of the excavation hole, and is applied to the outer peripheral surface of the tunnel lining body. A method of laying a cryo-pipe, comprising laying said cryo-pipe along. The freezing tube is made of metal,
straightening the frozen tube delivered toward the tunnel lining;
A method for laying a frozen pipe according to any one of claims 1 to 4. constructing a tunnel lining along the inner peripheral surface of an excavated hole excavated by the excavator by assembling a plurality of segment pieces inside the excavator;
Sending out a wound metal freezing pipe, laying the freezing pipe along the outer peripheral surface of the tunnel lining,
Predetermined tension is applied to the frozen tube through rollers for feeding the frozen tube toward the tunnel lining body, the frozen tube is straightened , and an adhesive is applied to the straightened frozen tube. , a method of laying a cryo-tube.

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