JP2007247235A - Freezing and water-stopping apparatus and freezing and water-stopping method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a freezing and water-stopping apparatus which can freeze fluid flowing in a pipe in a short time, for execution of civil engineering work by freezing the fluid in the pipe, to thereby shorten a construction period. <P>SOLUTION: A shield machine 1 functions to discharge excavated earth introduced into a chamber 14, via a screw conveyor 17. When the screw conveyor 17 is to be repaired or the like, by feeding brine into a flexible hose 21 wound on the screw conveyor 17, the earth in a casing of the screw conveyor 17 is frozen. Herein the flexible hose 21 is mainly formed of a plastic material obtained by adding a liquid to an earth material, as a main ingredient, and covered with a cold conduction section 22 obtained by mixing a sub-ingredient higher in thermal conductivity than the main ingredient, to the main ingredient. Therefore the earth in the screw conveyor 17 can be frozen in a short time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a freeze-stop device and a freeze-stop method, and more particularly to a freeze-stop device and method for preventing inflow of groundwater and earth and sand into underground objects such as shield machines and tunnels.

  An earth pressure type shield machine used when forming a shield tunnel has a shield machine main body, and a cutter head is provided at a front position of the shield machine main body. A partition wall is provided at a rear position of the cutter head, and a chamber is formed between the cutter head and the partition wall. The earth and sand excavated by the cutter head flows into the chamber and is discharged from the chamber by a screw conveyor attached to the partition wall. Moreover, a plug made of earth and sand is formed on the screw conveyor, and the plug prevents groundwater from flowing into the shield machine main body.

  In this shield machine, if the screw of the screw conveyor is worn or damaged while the shield tunnel is being dug, it is necessary to repair or replace the screw. When the screw conveyor is removed from the partition wall, the action of the plug is lost. Therefore, when the screw is repaired or replaced, a means for preventing the inflow of groundwater into the shield machine main body is required.

  As a method of preventing the inflow of groundwater into the shield machine body, conventionally, the outer peripheral surface of the casing member closest to the chamber in the casing of the screw conveyor is cooled with a frozen material, and the earth and sand and water in the casing member are frozen. A freezing method is disclosed (for example, Patent Document 1).

On the other hand, after digging the shield holes in parallel, a so-called pipe roof construction method is also known in which a plurality of propulsion pipes are spanned between these shield holes as intermediate mountain stoppers, and the inside is widened (for example, Patent Document 2). In this pipe roof construction method, the outer wall of the shield hole is formed with an opening for propelling the propulsion pipe toward the ground or receiving the propulsion pipe from the ground.
Japanese Patent Publication No.7-113320 JP 2004-353377 A

  However, in the freezing method disclosed in the above-mentioned Patent Document 1, when freezing the casing, the frozen material made of small pieces of dry ice is arranged in a circumferential direction on the outer peripheral surface of the casing and pasted in a plurality of rows, Is covered with a heat insulating cover having a high heat insulating effect. For this reason, it took time to freeze the earth and sand and water in the casing, and there was a problem that it took a long time to repair and replace the screw.

  On the other hand, in the opening portion disclosed in Patent Document 1, if any accident occurs after the propulsion pipe starts, it is necessary to prevent the inflow of groundwater from the opening portion. At this time, assuming that the shield machine disclosed in Patent Document 1 and the shield hole disclosed in Patent Document 2 are respectively buried in the ground, in order to prevent the inflow of groundwater, the soil and the like are frozen. However, there is a problem that it takes time to freeze the earth and sand, which leads to a prolonged construction period. Furthermore, such problems are not limited to underground objects. For example, when pipes such as steel pipes in buildings are stopped and repaired, etc., the water in the steel pipes is frozen. Sometimes it happens.

  Accordingly, an object of the present invention is to provide a freeze-stop device that can efficiently freeze the fluid in the tube in a short period of time when the fluid in the tube is frozen, thereby shortening the construction period. There is.

  The freeze-stop device for underground objects according to the present invention that has solved the above problems is a freeze-stop device that freezes the fluid in the pipe body and stops the pipe body. A cooling pipe through which the brine to be frozen circulates is disposed around the pipe body, and a cold heat conductive material is disposed between the pipe body and the cooling pipe. The cold heat conductive material is obtained by adding a liquid to the soil material. A plastic material is used as a main material, and a secondary material having a higher thermal conductivity than that of the main material is mixed into the main material.

  In the freeze / stop apparatus according to the present invention, a plastic material obtained by adding a liquid to a soil material is used as a main material for the cold heat conducting material, and a secondary material having a high thermal conductivity is mixed in the soil material. By using such a main material, the main material can be disposed with almost no gap between the cooling pipe and the pipe body. Moreover, since the submaterial with high heat conductivity is mixed in this main material, the heat conductivity as the whole heat conductive material can be made high by the heat conductivity of this submaterial. Accordingly, the heat of the cold body can be transferred to the pipe body with high thermal conductivity with almost no gap between the cooling pipe and the pipe body. It can conduct efficiently. Because the cold heat of the brine flowing through the cooling pipe is transferred to the pipe body by such a cold heat conductive material, when the work is performed by freezing the fluid in the pipe body, the fluid in the pipe body is frozen in a short period of time, Can be shortened.

  Here, the pipe body communicates the underground buried object buried in the ground with the underground, and the underground fluid is frozen by freezing the fluid in the tubular body by the cold heat of the brine flowing through the cooling pipe. It can be set as the aspect which blocks | prevents inflow of the groundwater from the ground with respect to. In the case of this aspect, the work performed on the underground structure can be performed quickly, and the construction period can be shortened.

  Further, the underground object has a shield machine main body for excavating the ground, a cutter head for excavating the ground at a front position in the excavation direction in the shield machine main body, a chamber into which earth and sand excavated by the cutter head flows, The tubular body can be a sludge pipe that communicates with the chamber and discharges the earth and sand in the chamber.

  In this aspect, for example, when the mud pipe is damaged or worn, work such as repair or replacement can be quickly performed, and the construction period can be shortened.

  At this time, it can be set as the aspect by which the site | part provided with the cooling piping in a sludge pipe is provided with the dive which increases the freezing force of the frozen body formed by freezing the fluid in the sludge pipe.

  For example, in the case of a muddy water type shield machine in which the mud pipe is composed of only a pipe body, the frozen body formed may have a low frosting power simply by cooling the mud pipe. At this time, in the present invention, since the dive is provided in the water stop freezing portion, the freezing force of the frozen body can be improved, and the water stop performance and safety performance can be improved.

  The underground object is an outer wall of a tunnel formed in the ground, and an opening is formed in the outer wall for starting the propulsion pipe toward the ground or receiving the propulsion pipe from the ground. In addition, the cooling pipe and the cooling heat conductive material may be formed in the opening.

  In this aspect, for example, when the propulsion pipe is started toward the ground or when the opening that receives the propulsion pipe from the ground needs to be repaired or replaced, the fluid in the opening can be frozen at an early stage. Therefore, these operations can be performed quickly, and the construction period can be shortened.

  At this time, when the water is stopped, the cooling member is attached to the opening, has a tubular main body, and a cooling pipe is disposed along the inner surface of the main body. be able to.

  Thus, by setting it as the aspect by which the cooling pipe is arrange | positioned by the opening part, an opening part can be cooled efficiently and the fluid in an opening part can be frozen rapidly. This can contribute to shortening the construction period.

  On the other hand, it can be set as the aspect whose submaterial is a metal material or a carbon material. Since the metal material or the carbon material is excellent in thermal conductivity, the heat conductivity of the heat conductive material can be further improved by using the metal material or the carbon material as the auxiliary material.

  Moreover, it can also be set as the aspect by which the submaterial is made into any shape of a powder form, a granular form, a lump shape, and a fibrous form. When the secondary material has these shapes, the secondary material can be easily mixed evenly with respect to the primary material.

  Furthermore, the soil material may be a swellable bentonite and the liquid may be a plasticizer.

  As described above, if the soil material is a swellable bentonite, a large amount of water is required for plasticity, and there is a concern that the thermal conductivity of the main material is lowered. Therefore, when the soil material is swellable bentonite, the liquid is a plasticizer, so that a necessary amount of water can be reduced, and a decrease in thermal conductivity can be prevented. Examples of the “plasticizer” of the present invention include an aqueous solution containing an alkali metal salt, ethanol and the like.

  Moreover, it can also be set as the aspect by which at least 1 of the solidification material, the reinforcing fiber material, and the thickener is mixed in the main material. Thus, by mixing at least one of the solidifying material, the reinforcing fiber material, and the thickening material, the strength of the main material and hence the strength of the heat conductive material can be increased.

  Examples of the “solidifying material” in the present invention include cement-based solidifying materials, gypsum-based solidifying materials, chemical-based solidifying materials, and magnesium oxide-based solidifying materials. Examples of the “fiber material” include polypropylene, polyester, nylon, and polyvinyl chloride. Furthermore, examples of the “thickening material” include general thickening materials used in concrete technology, such as cellulose derivatives, polyacrylamides, polyvinyl alcohol, thickening polysaccharides (gua gum), β-1,3 glucan, and the like. be able to.

  Moreover, the underground water freezing / stopping method according to the present invention for solving the above-mentioned problems is a freezing / water stopping method for freezing a fluid in a pipe body to stop the pipe body, and the cooling pipe is connected to the pipe body. A plastic material made by adding a liquid to the soil material is used as the main material, and a cold heat conductive material mixed with the main material is a secondary material having a higher thermal conductivity than the main material. The cooling pipe is disposed so as to cover the brine, and the brine is circulated through the cooling pipe, thereby freezing the fluid flowing in the pipe body and stopping the water in the pipe body.

  According to the freezing and water stopping apparatus according to the present invention, when performing work by freezing the fluid in the pipe, the fluid in the pipe can be efficiently frozen in a short period of time, thereby shortening the work period.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each embodiment, portions having the same function are denoted by the same reference numerals, and redundant description may be omitted.

  FIG. 1 is a side sectional view of a shield machine to which a freeze / stop device according to a first embodiment of the present invention is applied, and FIG. 2 is a side sectional view of a shield tunnel excavated and formed by the shield machine.

  Before describing the freeze / stop device, the shield machine will be described. As shown in FIG. 1, the shield machine 1 according to this embodiment is a so-called mud pressure shield machine. The shield machine 1 includes a shield machine main body 11. A cutter head 12 is provided at a front position of the shield machine main body 11, and a partition wall 13 is provided at a position slightly rearward of the cutter head 12. A chamber 14 is formed between the cutter head 12 and the partition wall 13.

  Further, a shield jack 15 is provided at a rear position of the shield machine main body 11, and an erector 16 for assembling the segment S is provided behind the shield jack 15. Furthermore, a screw conveyor 17 is disposed on the back side of the partition wall 13 as a mud pipe for discharging the sediment accumulated in the chamber 14. The screw conveyor 17 includes a casing 17A, and a screw 17B is provided inside the casing 17A. The screw conveyor 17 communicates the ground with the shield machine 1 through the chamber 14.

  The shield machine 1 excavates the ground with the cutter head 12 and extends the shield jack 15 so as to take a reaction force on the assembled segment S. The earth and sand excavated when the shield machine 1 is excavated is introduced into the chamber 14. The earth and sand in the chamber 14 is mixed with water by rotating the screw 17B to become muddy water, introduced into the inside from the front end side of the casing 17A, and discharged from the rear end side.

  Next, the freeze / stop device will be described. As shown in FIG. 1, the freeze-stop device 2 includes a flexible hose 21 that is a cooling pipe. The flexible hose 21 is wound around a partition wall 13 in a casing 17 </ b> A of a screw conveyor 17. At the position where the flexible hose 21 is wound around the casing 17 </ b> A of the screw conveyor 17, a cold heat conducting portion 22 made of a cold heat conducting material is formed. The main material of the heat conductive material constituting the cold heat conduction part 22 is a plastic material obtained by adding a liquid to a soil material. The main material is mixed with a sub-material having a higher thermal conductivity than that of the main material to constitute a heat conductive material. An example of the blending ratio of the cold heat conduction part 22 is shown in Table 1, and an example of the blending amount is shown in Table 2.

As shown in FIG. 2, one end of the flexible hose 21 is connected to a tank 23 disposed in the vicinity of a shaft (not shown) in the shield tunnel T formed after digging with the shield machine 1. The tank 23 is filled with liquefied nitrogen LN _{2 serving as} a refrigerant. Liquefied nitrogen is supplied from the tank 23 to the flexible hose 21. The other end side of the flexible hose 21 is open. The liquefied nitrogen supplied from the tank 23 is vaporized by heat exchange with the muddy water in the casing 17 </ b> A, becomes a gas, and is discharged from the other end of the flexible hose 21.

  The freeze-stop device 2 is not attached at the normal time when excavation work is performed by the shield machine 1, and is attached to the screw conveyor 17 when the screw 17B is repaired or replaced in the screw conveyor 17. The attachment procedure of the freeze-stop device 2 will be described with reference to FIG. 3. As shown in FIG. 3 (a), the surface of the casing 17A of the screw conveyor 17 is exposed before the freeze-stop device 2 is attached. It has become.

  When the freeze-stop device 2 is attached, the flexible hose 21 is wound around a position close to the partition wall 13 in the casing 17A of the screw conveyor 17 as shown in FIG. Next, a paste-like cold heat conductive material is applied to the position where the flexible hose 21 is wound in the casing 17A with a trowel or the like. At this time, the cold heat conductive material is applied so as to completely cover the flexible hose 21. Then, as shown in FIG.3 (c), the cold-heat conduction part 22 is formed. Here, when the solidification material is mixed in the cold heat conductive material, the cold heat conductive material is solidified.

Operation | movement and an effect | action of the freeze water stop apparatus which concerns on this embodiment which has the above structure are demonstrated.
When the excavation work by the shield machine 1 is normally performed and the screw conveyor 17 is operating without any trouble, the work proceeds without the freeze-stop device 2 being attached to the screw conveyor 17. Then, when the excavation work by the shield machine 1 is performed and the screw 17B of the screw conveyor 17 is worn or damaged and needs to be replaced or repaired, the freeze water stop device 2 needs to stop the water.

  At this time, the freeze-stop device 2 is attached to the screw conveyor 17 by the procedure shown in FIG. When the cold heat conductive material is solidified to form the cold heat conductive portion 22, liquefied nitrogen is supplied from the tank 23 shown in FIG. 2 and the muddy water in the partition wall 13 introduced into the screw conveyor 17 is frozen. The screw conveyor 17 is stopped by freezing of the muddy water, and the inflow of groundwater into the shield machine main body 11 through the chamber 14 is prevented.

  Here, when the muddy water in the casing 17A of the screw conveyor 17 is frozen, the heat conductive material constituting the cold heat conduction part 22 is mainly made of a plastic material obtained by adding a liquid to a soil material. The main material is mixed with a sub-material having a higher thermal conductivity than that of the main material to constitute a heat conductive material.

  As the soil material, for example, cement, lime, clay, sand or the like is used, and here, for example, cement is used. A liquid such as water is added to the soil material, and a secondary material is mixed therein. As the secondary material, a material having higher thermal conductivity than the soil material, for example, a metal material or a carbon material is used, and here, iron which is a metal material is used.

  Moreover, as a shape of submaterial, it is set as the powder form, a granular form, a lump shape, a fiber form, etc., for example, it is set as the powder form here. Furthermore, a solidifying material, a reinforcing fiber material, and a thickening material are appropriately mixed in the heat conductive material.

  This heat conductive material is mainly made of a plastic material obtained by adding a liquid to a soil material, and this main material maintains fluidity until it is solidified. The sub-material mixed in the main material is, for example, a solid metal material, but is mixed almost uniformly into the main material by mixing in the main material having fluidity.

  Here, since the cold heat conduction part 22 is formed of the heat conductive material mixed with the submaterial having high heat conductivity in addition to the soil material, the heat of the liquefied nitrogen is efficiently transferred into the casing 17A. Can do. Therefore, the muddy water in the casing 17A can be efficiently frozen. Therefore, the muddy water in the casing 17A can be frozen in a short period of time and the water can be stopped, so that work such as repair and replacement of the screw 17B can be completed in a short period of time.

  Thus, since the high heat conductivity can be exhibited by using the heat conductive material according to the present invention, the heat of liquefied nitrogen can be efficiently transferred to the ground. Since the cold heat of liquefied nitrogen flowing through the cooling pipe is transferred to the mud pipe by such a cold heat conductive material, the mud water is frozen in a short period of time to prevent the inflow of groundwater in the underground buried objects. Therefore, the construction period can be shortened.

  Next, a second embodiment of the present invention will be described. FIG. 4 is a side sectional view of a shield machine to which the freeze / stop device according to the second embodiment is applied, and FIG.

  As shown in FIG. 4, the shield machine 10 to which the freeze / stop device according to this embodiment is applied is a so-called muddy-type shield machine. This shield machine 10 is mainly different from the shield machine 1 shown in the first embodiment in the configuration of the drainage pipe. In the shield machine 1 shown in the first embodiment, the mud pipe is a screw conveyor, whereas in the shield machine 10 according to this embodiment, the mud pipe 18 is provided with a screw. There is no tube. Other configurations have the same configuration as the shield machine 1 described in the first embodiment.

  Next, the freeze / stop device 2 will be described. In the freeze / stop device 2 used in the present embodiment, a flexible hose 21 serving as a cooling pipe is wound around the drainage pipe 18 as in the first embodiment. However, in FIG. 4, the illustration of the flexible hose is omitted. Further, a cold heat conduction portion 22 is formed at a position where the flexible hose 21 is wound around the mud pipe 18. The main material of the heat conductive material constituting the cold heat conduction part 22 is a plastic material obtained by adding a liquid to a soil material. The main material is mixed with a sub-material having a higher thermal conductivity than that of the main material to constitute a heat conductive material.

  Furthermore, the freeze-stop device 2 according to the present embodiment is provided with a plurality of stud gibbles 23. The stud gibber 23 is screwed into a nut 24 fixed to the outer peripheral surface of the mud pipe 18, and the tip thereof is provided so as to protrude into the mud pipe 18.

  The procedure for attaching the stud gibber 23 can be as shown in FIG. When attaching the stud dowel 23, first, the nut 24 is fixed to the outer peripheral surface of the mud pipe 18 by welding Y as shown in FIG.

  Next, as shown in FIG. 5 (b), a hole is made in the outer peripheral portion of the mud pipe 18 at the extended position of the hole of the nut 24. At this time, if a hole is made in the mud pipe 18, mud water in the mud pipe 18 may be ejected slightly. However, since the hole is minute, the ejection amount is also minute. In addition, when a hole is formed, muddy water can be prevented from being ejected by immediately covering the hole with a temporary lid.

  Then, as shown in FIG. 5 (c), the stud gibel 23 is screwed into the nut 24 and is directly penetrated into the mud pipe 18. And the front-end | tip part of the stud dowel 23 is protruded inside the mud pipe 18. As shown in FIG. After the stud gibber 23 has been attached in this manner, the flexible hose 21 is wound around the mud pipe 18 as shown in FIG.

  Unlike the earth pressure type shield machine 1, the muddy water type shield machine 10 is not provided with a screw conveyor, so that the water pressure from the ground can be received by the freezing force between the frozen body of the muddy water and the drainage pipe 18. Required. Accordingly, a higher freezing force is required. In this respect, the freeze / water stop device 2 according to the present embodiment is provided with a stud gibber 23 for increasing the freezing force of the frozen body. For this reason, when the mud water in the mud pipe 18 is frozen, the freezing force of the frozen body of the mud water can be increased, and the water pressure of the natural mountain can be countered with a high freezing force. Such a gibber can also be provided in a mud pressure shield machine.

  Next, a third embodiment of the present invention will be described. FIG. 6 is a cross-sectional view showing an outline of the pipe roof construction method, FIG. 7 is a side view of the entrance pipe portion of the first shield tunnel, and FIG. 8 is a cross-sectional view before the propulsion pipe is inserted. The freezing and water stopping apparatus according to the present embodiment is used when performing a pipe roof construction method.

  As shown in FIG. 6, in the pipe roof construction method, the shield machine is dug in the ground to provide two shield tunnels T1 and T2, and between these parallel shield tunnels T1 and T2, A plurality of propulsion pipes 3 are passed over. In the example shown in FIG. 6, only one propulsion pipe 3 is depicted, but a large number of propulsion pipes 3 are provided apart from each other in the direction in which the shield tunnels T1 and T2 are dug. By using this propulsion pipe 3 for mountain stopping and excavating the inside of the propulsion pipe 3, an underground structure or the like is provided between the shield tunnels T1 and T2.

  As shown in FIG. 7, an entrance pipe 31 that is an opening of the present invention serving as a starting port when the propulsion pipe 3 is started is provided in the segment S serving as an outer wall in the first shield tunnel T1. The entrance pipe 31 has a hollow cylindrical shape arranged along the radial direction of the first shield tunnel T1. A water stop brush 32 is provided on the inner surface on the rear end side of the entrance pipe 31. Before the propulsion pipe 3 starts, the front end portion of the entrance pipe 31 is closed by the outer shell 33.

  A propulsion unit 34 is attached to the tip of the propulsion tube 3. While excavating the ground with this propulsion device 34, the propulsion pipe 3 is pushed into the ground. In the entrance pipe 31, when the propulsion pipe 3 penetrates the outer shell 33 while cutting the outer shell 33 with the propulsion device 34 at the tip, and when propelling in the ground, groundwater and earth and sand flow into the first shield tunnel T1 from the periphery of the propulsion pipe. It is installed to prevent you from doing. For this purpose, a plurality of water stop brushes 32 are attached to the rear end of the entrance pipe 31 in a ring shape.

  As shown in FIG. 9, the freeze / stop device 2 according to this embodiment is attached to an entrance pipe 31. The entrance pipe 31 is provided with a drain valve 35 on the outside thereof, and when groundwater or the like flows into the entrance pipe 31, the drain valve 35 is opened to allow drainage. However, when further water stop is necessary, the freeze water stop device 2 is operated for earth and sand or groundwater in the entrance pipe 31.

  The flexible hose 21 in the freeze / stop device 2 is wound around the outer surface of the entrance pipe 31. The heat conduction part 22 is provided in the entrance pipe 31 at the position where the flexible hose 21 is wound. One end of the flexible hose 21 is connected to a tank (not shown), and liquefied nitrogen is supplied from this tank.

  In the freezing and water stopping apparatus 2 according to the present embodiment having the above-described configuration, as in the first embodiment, the cold heat conduction unit 22 is a heat in which an auxiliary material having a high thermal conductivity is mixed in addition to a soil material. Since it is formed of a conductive material, the heat of liquefied nitrogen can be efficiently transferred into the entrance pipe 31. Therefore, the muddy water in the entrance pipe 31 can be efficiently frozen. Therefore, since the muddy water in the entrance pipe 31 can be frozen in a short period of time and water can be stopped, the work can be completed in a short period of time. Therefore, in order to prevent the inflow of groundwater in the underground buried object, the muddy water can be frozen in a short period of time, and the water can be stopped, thereby shortening the construction period.

  By the way, the state in which the freezing and water stoppage in the entrance pipe 31 is performed is when the propulsion pipe 3 and the waterstop brush 32 in the entrance pipe 31 are repaired. Therefore, the propulsion of the propulsion pipe 3 is stopped during this period. For this reason, as shown in FIG. 9, a cooling member 40 may be separately provided in the entrance pipe 31 located at the rear end of the propulsion pipe 3. The cooling member 40 includes a tubular main body 41. The outer diameter of the main body 41 is slightly smaller than the inner diameter of the entrance pipe 31 and can be inserted into the entrance pipe 31. The flexible hose 21 is disposed along the inner wall of the main body portion 41, and the cold heat conduction portion 22 is formed on the surface thereof. In this way, the flexible hose 21 is disposed on the inner surface of the main body 41 and is covered with the cooling / heat conduction unit 22.

  By mounting such a cooling member 40 on the propulsion pipe 3 instead of the entrance pipe 31, the earth and sand in the entrance pipe can be frozen earlier.

  Moreover, although each said embodiment demonstrated the aspect which provides the freeze water stop apparatus 2 which freezes the earth and sand in the screw conveyor 17, the waste pipe 18, and the entrance pipe 31, the earth and sand frozen by the freeze water stop apparatus 2 were demonstrated. It is also possible to provide a thawing member for thawing. An example thereof will be described with reference to FIG. 10 as a modified example of the freeze / stop device shown in FIG. The shield machine 1 according to this example is provided with a hot water flexible hose 25 in addition to the freeze-stop device 2. The hot water flexible hose 25 is connected to a hot water tank (not shown), and hot water is supplied from the hot water tank to the hot water flexible hose 25.

  Thus, after freezing the earth and sand by the freeze water stop device 2 and repairing the screw conveyor 17, the excavation work can be resumed early by thawing the frozen earth and sand at an early stage. Here, by providing the thawing member, the frozen earth and sand can be thawed in a short time, which can contribute to shortening the construction period.

  Moreover, in each said embodiment, although the screw conveyor which is a pipe body in a buried object, a sludge pipe, and an entrance pipe are demonstrated as an example as a pipe body, for example, pipes normally used on the ground etc. The freezing and water stopping device of the present invention can also be applied when freezing the inside.

It is a sectional side view of the shield machine which the freezing and water stopping apparatus which concerns on 1st embodiment is applied. It is a sectional side view of the shield tunnel excavated and formed with the shield machine. It is process drawing explaining the attachment procedure of the freeze water stop apparatus. It is a sectional side view of the shield machine which the freezing and water stopping apparatus which concerns on 2nd embodiment is applied. It is process drawing explaining the attachment process of a dowel. It is sectional drawing which shows the outline | summary of a pipe roof construction method. It is a side view of the entrance pipe part of a 1st shield tunnel. It is sectional drawing before inserting the propulsion pipe of an entrance pipe part. It is sectional drawing of the state which inserted the freezing member in the entrance pipe. It is a sectional side view which shows the example which provided the shield machine excavation member to which the freezing and water stopping apparatus which concerns on 1st embodiment is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... (earth pressure type) shield machine 2 ... freezing water stop device 3 ... propulsion pipe 10 ... (muddy water type) shield machine 11 ... shield machine body 12 ... cutter head 13 ... partition 14 ... chamber 17 ... screw conveyor 17A ... casing 17B ... Screw 18 ... Mud pipe 21 ... Flexible hose 22 ... Cooling heat conduction part 23 ... Stud gibber 25 ... Hot water flexible hose 31 ... Entrance pipe 32 ... Water stop brush 33 ... Outer shell 34 ... Propeller 40 ... Cooling member S ... segment

Claims (11)

A freezing and water stopping device for freezing a fluid in a tubular body and stopping the tubular body,
A cooling pipe through which a brine for freezing a fluid flowing through the pipe flows is arranged around the pipe, and a cooling heat conductive material covering the cooling pipe is arranged between the pipe and the pipe.
The cold heat conductive material is a frozen material that is mainly composed of a plastic material obtained by adding a liquid to a soil material, and a secondary material having a higher thermal conductivity than the main material is mixed in the main material. apparatus. The tubular body communicates with the underground object buried in the ground and the underground,
The freezing and water stopping device according to claim 1, wherein the inflow of groundwater from the underground to the underground object is prevented by freezing the fluid in the pipe body with the cold heat of the brine flowing through the cooling pipe. The buried object has a shield machine main body for excavating the ground, a cutter head for excavating the ground at a front position in the excavation direction in the shield machine main body, and a chamber into which earth and sand excavated by the cutter head flows. , Is a shield machine that was formed,
The freeze water-stopping device according to claim 2, wherein the pipe body is a mud pipe that communicates with the chamber and discharges the sediment in the chamber.   The anti-freezing according to claim 3, wherein a portion of the mud pipe where the cooling pipe is provided is provided with a gibber that increases a frosting force of a frozen body formed by freezing a fluid in the mud pipe. apparatus. The underground object is an outer wall of a tunnel formed in the ground, and the outer wall is formed with an opening for starting the propulsion pipe toward the ground or receiving the propulsion pipe from the ground. And
The freezing and water stopping device according to claim 2, wherein the cooling pipe and the cold heat conductive material are formed in the opening.   The cooling member which is attached to the opening when water stop is performed, has a tubular main body, and the cooling pipe is disposed along the inner surface of the main body. The freeze-stop device described.   The freeze-stop device according to any one of claims 1 to 6, wherein the auxiliary material is a metal material or a carbon material.   The freeze-stop device according to any one of claims 1 to 7, wherein the sub-material is in a powder, granular, massive, or fibrous shape. The soil material is swellable bentonite;
The freeze-stop device according to any one of claims 1 to 8, wherein the liquid is a plasticizer.   The frozen water stop device according to any one of claims 1 to 9, wherein at least one of a solidifying material, a reinforcing fiber material, and a thickening material is mixed in the main material. A freezing / water-stopping method for freezing a fluid in a pipe and water-stopping the pipe,
A cooling pipe is arranged around the pipe body,
A cooling material comprising a plastic material formed by adding a liquid to a soil material as a main material and a cold heat conductive material in which a sub-material having a higher thermal conductivity than the main material is mixed in the main material is provided between the cooling pipe and the pipe body. To cover
A freezing and water stopping method characterized by freezing a fluid flowing through the pipe body by causing brine to flow through the cooling pipe to stop the water inside the pipe body.

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