JP5038058B2 - Shield machine and freezing method in chamber - Google Patents

Description

  The present invention relates to a shield machine and a freezing method in a chamber for freezing soil and the like in the chamber in order to remove foreign matters staying in the chamber in the shield machine.

  In the earth pressure type shield machine, a cutter head is provided in front of the outer cylinder portion, and excavation is performed while excavating a natural ground with a bit in the cutter head. A partition wall is formed behind the cutter head, and the chamber between the cutter head and the partition wall is filled with earth and sand excavated by the cutter head. In the earth pressure type shield machine, the soil filling the chamber is discharged by a screw conveyor or the like. In the earth pressure type shield machine, there is a problem that when a large foreign matter such as a rock is mixed in the chamber, the foreign matter may block the entrance of the screw conveyor and hinder the discharge of earth and sand.

  When foreign matter is mixed into the chamber in this way, it is required that an operator communicates the inside of the outer cylinder portion and the chamber in the chamber to form a communication port, and the foreign matter in the chamber is taken into the outer cylinder portion through the communication port. It is done. However, if the inside of the outer cylinder part and the chamber are to be communicated with each other, it is required to stop the communication port in order to prevent groundwater contained in the chamber or the surrounding natural ground from flowing into the outer cylinder part. .

In order to stop this communication port, there is, for example, a work area forming method for forming a ground improvement area in which a chemical solution is injected into a ground mountain ahead in the digging direction of the earth pressure type shield digging machine to improve water stoppage (for example, Patent Document 1). In this work area forming method, the cutter head replacement work is described, but when the shield machine reaches the ground improvement area, the muddy water in the chamber is discharged. At this time, foreign substances in the chamber can be removed. In the ground having improved waterstop, it is possible to prevent the inflow of groundwater into the chamber, so that foreign matter in the chamber can be easily removed while preventing the inflow of groundwater into the outer cylinder portion.
JP 2007-77682 A

  However, in the work area forming method disclosed in Patent Document 1, it is necessary to improve the ground in front of the shield machine in the digging direction. Since it takes time to improve the ground, there is a problem that it takes time to remove foreign matter accordingly. In addition, ground improvement is performed mainly by injecting chemicals from the ground. For this reason, when a chemical solution flows into the chamber, there is a problem that an operation for removing the chemical solution occurs or the chemical solution is left on the ground. This problem also occurs when a problem in the chamber, such as an operation for exchanging equipment such as an agitator in the chamber, is eliminated, including the foreign matter removal operation.

  Then, the subject of this invention is in the shield machine and shield machine which can prevent the inflow of a groundwater into an outer cylinder part, and can eliminate suitably the malfunction in a chamber, without performing the ground improvement by chemical | medical solution injection | pouring. It is to provide a method for freezing in a chamber.

The shield machine according to the present invention that has solved the above problems includes a partition plate that partitions the inner side of the outer cylinder part whose front part opens and the front outer part of the outer cylinder part, and a cutter part that excavates the ground in front of the outer cylinder part. The chamber is formed between the partition plate and the cutter part, and the filling material stays in the chamber, the filling material taken into the chamber is frozen, and the inflow of groundwater into the outer cylinder part is prevented. A freezing device for forming an ice valve is provided, and the ice valve is formed around the foreign matter when the foreign matter enters the chamber .

  In the shield machine according to the present invention, a freezing device is provided that forms an ice valve that freezes the filling material taken into the chamber and prevents the inflow of groundwater into the outer cylinder. For this reason, when solving the malfunction in the chamber, an ice valve is formed by a freezing device in a portion where water stop is desired to be performed, thereby preventing inflow of groundwater into the outer cylinder portion. By using such a freezing device, it is not necessary to improve the ground by injecting chemicals, so that groundwater can be prevented from flowing into the outer cylinder without performing ground improvement by injecting chemicals, and defects in the chamber can be suitably performed. It can be solved.

  The “fill” in the present invention refers to earth and sand or muddy water filled in the chamber. In the so-called earth pressure shield machine, “earth and sand” is referred to. Say.

Here, attached to the specification cutting plate, by removing from the partition plate and the inner chamber and the outer tubular section and auxiliary device is provided which communicates, freezing apparatus, until reaching the accessory device from the chamber It is also possible to form an ice bulb by freezing the intervening filling. Examples of the “attachment device that is attached to the partition plate and communicates with the inside of the outer cylinder portion by being removed from the partition plate” in the present invention include an earth and sand intake pipe, an agitator, a screw conveyor, a waste mud valve, and the like. Can do.

  Furthermore, the freezing device may be provided in at least one of the partition plate and the cutter unit.

  The freezing apparatus is preferably provided on at least one of the partition plate and the cutter unit surrounding the chamber.

  In addition, the cutter unit may include a cutter head that is rotatable around an axis along the extending direction of the outer cylinder unit, and the freezing device may be attached to the cutter head.

  As described above, even when the position where the ice valve is to be formed in the chamber is changed by providing the freezing device on the cutter head that is rotatable around the axis along the extending direction of the outer cylinder portion. The freezing device can be moved according to the position where the ice valve is to be formed.

  Furthermore, an anti-freezing agent addition device for adding an anti-freezing agent to the packing around the foreign matter is provided, and the freezing device adds the anti-freezing agent to the filling around the foreign matter, It can also be set as the aspect which freezes the packing around the packing which added the cryoprotectant.

  As described above, by adding the antifreezing agent to the packing around the foreign material, it is possible to reduce the work of destroying the frozen packing when removing the foreign material.

  Moreover, the freezing method in the chamber in the shield machine according to the present invention that solves the above problems includes a partition plate and an outer cylinder part that partition the inner side of the outer cylinder part whose front part opens and the outer front part of the outer cylinder part. In order to remove foreign matter that has entered the chamber in the shield machine in which a cutter part for excavating the ground is provided in front of the chamber, a chamber is formed between the partition plate and the cutter part, and a filler is retained in the chamber. An ice valve is formed by a freezing device to freeze the filling taken into the chamber and prevent the filling from flowing into the outer cylinder.

  Here, after forming an ice valve around the foreign material when the foreign material enters the chamber, the foreign material can be removed.

  Also, an aspect in which an antifreezing agent is added to the packing around the foreign material, the packing around the packing to which the antifreezing agent is added is frozen, and the foreign material is removed together with the frozen packing. It can be.

  According to the shield machine and the freezing method in the chamber of the shield machine according to the present invention, it is possible to preferably solve the problem in the chamber without performing ground improvement by chemical injection.

  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 according to the first embodiment, and FIG. 2 is a front view of the shield machine according to the first embodiment.

  As shown in FIGS. 1 and 2, the shield machine 1 according to the present embodiment is a so-called muddy shield machine, and includes an outer cylinder portion 10. A cutter head 11 serving as a cutter portion is provided at a position ahead of the front end opening of the outer cylinder portion 10. Further, a partition plate 12 is provided at a position slightly rearward from the front end portion of the outer cylinder portion 10. A chamber 13 is formed between the cutter head 11 and the partition plate 12.

  A large number of cutter bits 11 </ b> A are provided in front of the cutter head 11. The cutter head 11 is attached to the partition plate 12 via a rotating shaft 14. As the rotary shaft 14 rotates, the cutter head 11 rotates. The natural ground cuts the cutter bit 11A by the rotation of the cutter head 11, and excavation is performed.

  The partition plate 12 is disposed so as to close the front opening of the outer cylinder portion 10. The partition plate 12 prevents the muddy water in the chamber 13 and the underground water contained in the surrounding natural ground from entering the outer cylinder portion 10. Further, the partition plate 12 prevents muddy water in the chamber 13 from flowing into the outer cylinder portion 10.

  A rotation shaft 14 is connected to the center of the partition plate 12, and a motor 15 is connected to the rear of the rotation shaft 14. The operation of the motor 15 rotates the rotating shaft 14 and the cutter head 11 attached to the rotating shaft 14.

  An intake port 12A is formed at a position below the partition plate 12, and a sludge pipe 16 is connected to the intake port 12A. In addition, a mud pipe (not shown) may be provided above the partition plate 12. The mud discharge pipe 16 discharges muddy water in the chamber 13. The sludge pipe 16 penetrates the intake port 12A, and a screw conveyor may be provided in the sludge pipe 16, or a sludge valve may be provided behind the sludge pipe 16. . The drainage pipe 16 is arranged with its tip slightly protruding from the inside of the outer cylinder portion 10 into the chamber 13. The muddy water discharged from the chamber 13 by the mud discharge pipe 16 is conveyed to the outside of the outer cylinder portion 10 by a pump (not shown).

  An agitator 17 and a stirring bar 18 are attached to the front upper portion of the partition plate 12. Further, a stirring bar 18 is attached to the rear side of the cutter head 11. The agitator 17 and the stirring rod 18 agitate the muddy water in the chamber 13 when the cutter head 11 is rotating.

  The chamber 13 is filled with muddy water excavated by the cutter bit 11 </ b> A in the cutter head 11. The earth and sand and the muddy water, which are fillers in the chamber 13, are discharged to the inside of the outer cylinder portion 10 through the mud pipe 16.

  Moreover, earth and sand and mud water in the chamber 13 are connected to surrounding natural ground in the shield machine 1, and ground water in the natural ground flows into the earth and sand and mud water in the chamber 13. The groundwater is prevented from flowing into the outer cylinder portion 10 by the partition plate 12. However, equipment necessary for excavation and the like is attached to the partition plate 12, and it is necessary to prevent the groundwater from flowing into the outer cylinder portion 10 through the attachment positions of these equipment. In the present embodiment, the mud pipe 16 and the agitator 17 which are devices attached to the partition plate 12 are attached to the partition plate 12, and the 13 chamber and the inside of the 10 outer cylinder portion are connected by being removed from the partition plate 12. It becomes an attached device to communicate.

  Further, a shield jack 19 is provided at the rear portion of the outer cylinder portion 10. The shield jack 19 includes a shield jack cylinder 19B and a shield jack rod 19A, and the tip of the shield jack rod 19A presses the assembled segment S. By pressing the segment S with the shield jack rod 19A, a reaction force is applied to the segment S to advance the shield machine 1.

  Further, a tail seal T is provided at the rear end portion of the outer cylinder portion 10. The tail seal T stops water between the segment S and the shield machine 1 at the rear end portion of the shield machine 1.

  A freezing tube 20 that is a freezing device of the present invention is provided around the inlet 12A in the partition plate 12 and around the cutter head 11. The freezing pipe 20 is connected to the refrigerant tank 21, and a cooling fluid having a negative temperature is circulated and supplied to the freezing pipe 20 by operating a pump (not shown). By circulating and supplying the frozen liquid to the freezing pipe 20, earth and sand and mud near the intake port 12 </ b> A in the chamber 13 can be frozen. In addition, as a cooling fluid, the liquid and gas which a cooling fluid has cold heat, for example, liquid nitrogen, liquid air, etc. can be used.

  Next, the procedure of the method for freezing the chamber and the foreign matter removal method in the shield machine 1 according to the present embodiment will be described. In this embodiment, the muddy water in the chamber 13 becomes the earth and sand of the present invention.

  When excavating with the shield machine 1, the ground is excavated by rotating the cutter head 11. The muddy water generated by excavating the natural ground is discharged into the outer cylinder portion 10 through the mud pipe 16. In the chamber 13, the muddy water is stirred by the stirring rod 18 and the agitator 17 attached to the cutter head 11 and the partition plate 12. Thus, the chamber 13 is maintained in a state filled with earth and sand and muddy water.

  As the excavation progresses, in the chamber 13, when a natural rock hits a large rock or the like, this rock may enter the chamber 13. When such foreign matters such as rocks are generated in the chamber 13 and are located in the vicinity of the intake port 12A, the foreign matters obstruct the discharge of the muddy water, and the muddy water cannot be discharged smoothly. In this case, for example, the mud pipe 16 is removed from the intake 12A, and the foreign matter is removed from the rear of the intake 12A. Here, since a problem occurs when the foreign matter is in the vicinity of the intake port 12A, it is preferable to remove the foreign matter from the rear of the intake port 12A.

  When removing the foreign matter, the cutter head 11 is first stopped to stop the excavation. Subsequently, as shown in FIG. 3A, the frozen liquid is circulated and supplied into the freezing tube 20. Since the freezing tube 20 is provided around the intake port 12A, when the frozen liquid is circulated and supplied into the freezing tube 20, the temperature around the intake port 12A in the chamber 13 is 0 ° C. or less. Then, the muddy water around the inlet 12A is frozen.

  When the circulating supply of the frozen liquid in the freezing tube 20 is continued, an ice valve B is formed at a lower position in the chamber 13 as shown in FIG. The ice valve B includes the foreign matter X and grows to a size that closes the intake port 12A.

  When the ice valve B is grown to a size that includes the foreign matter X and closes the intake port 12A, the mud pipe 16 is removed from the intake port 12A as shown in FIG. After removing the mud pipe 16 from the intake port 12A in this manner, the worker removes the earth and sand on the inner surface of the intake port 12A while scraping the ice valve B.

  If the earth and sand are removed while scraping the ice bulb B, it will eventually collide with the foreign object X. Then, the worker takes out the foreign matter X and discharges it to the inside of the outer cylinder portion 10 through the intake port 12A. When the foreign object X is huge, the foreign object X is taken out while crushing the foreign object X.

  When the foreign matter X is taken out from the chamber 13 in this way, the mud pipe 16 is attached to the intake port 12A to close the intake port 12A. Then, the circulation of the frozen liquid to the freezing tube 20 is stopped, and the temperature in the chamber 13 is set to 0 ° C. or higher. By maintaining this state for a certain period of time, the ice valve B disappears as shown in FIG. At this time, the ice valve B can be extinguished earlier by circulatingly supplying hot water to the freezing tube 20. When the ice valve B disappears, the cutter head 11 is rotated again to resume excavation.

  If the intake port 12A is large enough for the worker to enter the chamber 13, the worker enters the chamber 13 from the intake port 12A and removes the ice valve B and the foreign matter. You can also do work.

  As described above, in the shield machine 1 according to this embodiment, the position near the intake port 12 </ b> A through which the mud pipe 16 passes in the chamber 13 is frozen by circulating the frozen liquid in the freezing pipe 20. Can do. By freezing the vicinity of the intake port 12A in the chamber 13, foreign matter can be removed while preventing the groundwater from flowing into the outer cylinder part 10 without improving the ground by injecting the chemical solution. .

  Next, a second embodiment of the present invention will be described. This embodiment differs in the attachment position of a freezing tube compared with the said 1st Embodiment. As shown in FIG. 4, in the shield machine 2 according to the present embodiment, the sludge discharge pipe 16 includes a tip portion 16A and a rear portion 16B, and the tip portion 16A and the rear portion 16B are removable. Yes. Further, the freezing pipe 20 is attached to the distal end portion 16 </ b> A of the mud pipe 16. About another point, it has the structure similar to the said 1st Embodiment.

  The chamber freezing method and the foreign matter removing method in the shield machine 2 according to this embodiment having the above-described configuration will be described. The shield machine 2 according to the present embodiment is suitably used when foreign matter is mixed in the rear portion 16B of the mud pipe 16 to block the mud pipe 16 or the circulation of earth and sand deteriorates.

  As shown in FIG. 4, in the downstream position of the mud pipe 16, when the foreign matter X is generated and the mud pipe 16 is blocked, or the flow of earth and sand in the mud pipe 16 is deteriorated, The frozen liquid is circulated and supplied, and the muddy water in the tip of the mud pipe 16 is frozen to form the ice valve B.

  In this state, the rear part 16B of the mud pipe 16 is removed from the tip part 16A. By forming the ice valve B in the tip portion 16A of the mud pipe 16, the groundwater contained in the chamber 13 and the earth and sand of the natural ground flows into the outer cylinder part 10 through the mud pipe 16. Is prevented. Subsequently, the foreign matter X contained in the removed rear portion 16B is removed, and the rear portion 16B is attached to the tip portion 16A again. In this way, the blockage or the like of the mud pipe 16 is eliminated.

  Thus, in the shield machine 2 according to the present embodiment, the muddy water in the tip portion 16A of the drainage pipe 16 can be frozen by circulating the frozen liquid in the freezing pipe 20, so that the ground due to the chemical injection The foreign matter removal operation can be performed while preventing the inflow of groundwater into the outer cylinder portion 10 without making any improvements.

  Next, a third embodiment of the present invention will be described. The shield machine 3 according to the present embodiment is a so-called earth pressure shield machine, and as shown in FIG. 5, a screw conveyor 30 is used instead of the drainage pipe 16 shown in the first embodiment. .

  In the shield machine 3 according to the present embodiment, the ice valve B is formed when the screw conveyor 30 is removed from the partition plate 12 for maintenance, inspection, repair or the like of the screw conveyor 30. When maintenance, inspection, repair or the like of the screw conveyor 30 is performed, the frozen liquid is circulated and supplied to the freezing pipe 20, and the ice valve B is formed at the mounting position of the screw conveyor 30 in the chamber 13. Thereafter, the screw conveyor 30 is removed from the partition plate 12. At this time, since the installation position of the screw conveyor 30 is closed by the ice valve B, the groundwater contained in the chamber 13 and the earth and sand of the natural ground flows into the outer cylinder portion 10 through the mud pipe 16. Is prevented. Thereafter, after the screw conveyor 30 is maintained, the screw conveyor 30 is attached to the partition plate 12.

  As described above, in the shield machine 3 according to the present embodiment, by allowing the earth and sand at the attachment position of the screw conveyor 30 in the chamber 13 to freeze, the inflow of groundwater into the outer cylinder portion 10 can be prevented. Therefore, operations such as maintenance, inspection, and repair of the screw conveyor 30 can be performed while preventing the inflow of groundwater into the outer cylinder portion 10 without performing ground improvement by chemical solution injection. In particular, in the shield machine 3 of the earth pressure type, although the earth and sand are being stirred in the chamber 13, the earth and sand that cannot be stirred may be agglomerated to generate an earth lump. Such a lump also becomes a foreign substance that becomes a hindrance when taking in the earth and sand.

  Further, as shown in FIG. 6, the mud pipe 16 in the mud shield shield machine 1 is provided with a mud valve 16V. When performing maintenance or the like of the mud discharge valve 16V, the same measures as when performing maintenance or the like of the screw conveyor 30 shown in FIG. 5 can be taken. Here, the freezing pipe 20 is disposed at the tip 16A of the mud pipe 16 shown in FIG. By circulating and supplying the frozen liquid to the freezing pipe 20, the earth and sand at the distal end portion 16 </ b> A of the mud pipe 16 is frozen to form an ice valve B, thereby preventing the inflow of groundwater into the outer cylinder portion 10.

  In this state, the mud valve 16V is removed, and the mud valve 16V is maintained. At this time, since the tip portion 16A of the mud pipe 16 is blocked by the ice valve B, the inflow of groundwater into the outer cylinder portion 10 can be prevented. Therefore, operations such as maintenance of the mud valve 16V can be performed while preventing the inflow of groundwater into the outer cylinder part 10 without improving the ground by injecting the chemical solution.

  Furthermore, when performing work such as maintenance of the agitator 17 in the first embodiment, it is possible to take the same measures as when performing maintenance or the like of the screw conveyor 30 shown in FIG. In this case, as shown in FIG. 7, the freezing tube 20 is disposed at the attachment position of the agitator 17 on the partition plate 12. By circulating and supplying the frozen liquid to the freezing pipe 20, the earth and sand around the mounting position of the agitator 17 in the chamber 13 is frozen to form an ice valve B, thereby preventing the inflow of groundwater into the outer cylinder portion 10. To do.

  In this state, the agitator 17 is removed and the agitator 17 is maintained. At this time, since the mounting position of the agitator 17 in the chamber 13 is closed by the ice valve B, the inflow of groundwater into the outer cylinder portion 10 can be prevented. Therefore, operations such as maintenance of the agitator 17 can be performed while preventing the inflow of groundwater into the outer cylinder part 10 without improving the ground by injecting the chemical solution.

  Next, a fourth embodiment of the present invention will be described. As shown in FIG. 8, the shield machine 4 according to the present embodiment includes an antifreezing agent addition device 40 that adds an antifreezing agent into the chamber 13. The antifreezing addition apparatus includes a blower outlet 41 provided on the side of the chamber 13 in the partition plate 12 and a supply device 42 that supplies the antifreezing agent to the blower outlet 41. About another point, it has the structure similar to the said 1st Embodiment.

  Next, a method for freezing a chamber and a method for removing foreign matter in the shield machine 4 according to the present embodiment will be described.

  As shown in FIG. 9A, in the downstream position of the mud pipe 16, when the foreign matter X is generated and the mud pipe 16 is blocked, or the circulation of mud water in the mud pipe 16 is deteriorated, An antifreezing agent is ejected from the outlet 41 to the periphery of the foreign matter X, and an antifreezing region Y is formed around the foreign matter X as shown in FIG. As the antifreezing agent, an appropriate one can be used. For example, calcium chloride, sodium chloride, calcium acetate, sodium formate, a mixture thereof, or a thickener added thereto can be used.

  When the anti-freezing agent is ejected to form the anti-freezing region Y, the frozen liquid is circulated and supplied to the freezing tube 20 to form the ice valve B around the anti-freezing region Y as shown in FIG. . At this time, in the ice valve B, the portion to which the antifreezing agent is added is not frozen and remains muddy water. For this reason, the foreign material X is not frozen. On the other hand, the ice valve B includes the foreign matter X and grows to a size that closes the intake port 12A.

  Thereafter, as shown in FIG. 9 (d), the sludge pipe 16 is removed from the intake port 12 </ b> A, and an operator enters the chamber 13 through the intake port 12 </ b> A opened when viewed from the inside of the outer cylinder part 10. Then, the foreign matter X is removed. At this time, since the antifreezing region Y is formed around the foreign matter X, the worker can easily remove the foreign matter X. Thereafter, the ice valve B is extinguished by the same procedure as in the first embodiment, and excavation is resumed.

  Thus, in forming the ice valve B, by adding an antifreezing agent around the foreign matter X, the foreign matter X can be easily removed while preventing the inflow of groundwater into the outer cylinder portion 10. it can. Moreover, when adding an antifreezing agent with the earth pressure type shield machine 3 shown in FIG. 5, the screw conveyor 30 can be used as an antifreezing agent addition apparatus. In this case, the antifreezing agent can be fed back into the chamber 13 by operating the screw conveyor 30 contrary to the case of discharging muddy water.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the first embodiment, the freezing tube 20 is provided on the partition plate 12 and the cutter head 11, but it can also be provided on the lower position of the hood plate, which is the tip of the outer cylinder 10, or on the rotating shaft 14. Moreover, freezing apparatuses other than a freezing pipe can also be used.

It is a sectional side view of the shield machine according to the first embodiment. It is a front view of the shield machine according to the first embodiment. It is process drawing which shows the process of removing the foreign material in a chamber. It is a sectional side view of the shield machine according to the second embodiment. It is a sectional side view of the shield machine which concerns on 3rd Embodiment. In the shield machine which concerns on 1st Embodiment, it is a sectional side view of the state which formed the ice valve in the front-end | tip of the earth and sand intake pipe. In the shield machine which concerns on 1st Embodiment, it is a sectional side view of the state which formed the ice valve in the attachment position of an agitator. It is a sectional side view of the shield machine which concerns on 4th Embodiment. In the shield machine which concerns on 4th Embodiment, it is process drawing which shows the process of removing the foreign material in a chamber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1-4 ... Shield machine 10 ... Outer cylinder part 11 ... Cutter head 11A ... Cutter bit 12 ... Partition plate 12A ... Inlet 13 ... Chamber 14 ... Rotating shaft 15 ... Motor 16A ... Tip part 16B ... Back part 16 ... Exhaust Mud pipe 16V ... Drain valve 17 ... Agitator 18 ... Agitating rod 19 ... Shield jack 19A ... Shield jack rod 19B ... Shield jack cylinder 20 ... Freezing pipe 21 ... Refrigerant tank 30 ... Screw conveyor 40 ... Antifreeze additive addition device 41 ... Blow Outlet 42 ... Supply device S ... Segment T ... Tail seal X ... Foreign matter Y ... Anti-freezing area

Claims (7)

A partition plate for partitioning an inner side of the outer cylinder portion whose front portion opens and a front outer side portion of the outer cylinder portion, and a cutter portion for excavating the ground in front of the outer cylinder portion are provided, the partition plate and the cutter portion, A chamber is formed between the chambers, and the filling material is retained in the chamber,
A freezing device is provided that forms an ice valve that freezes the packing taken into the chamber and prevents the inflow of groundwater into the outer cylinder portion ,
The shield machine according to claim 1 , wherein the ice valve is formed around the foreign matter when the foreign matter enters the chamber . A partition plate for partitioning an inner side of the outer cylinder portion whose front portion opens and a front outer side portion of the outer cylinder portion, and a cutter portion for excavating the ground in front of the outer cylinder portion are provided, the partition plate and the cutter portion, A chamber is formed between the chambers, and the filling material is retained in the chamber,
A freezing device is provided that forms an ice valve that freezes the filling material taken into the chamber and prevents the inflow of groundwater into the outer cylinder portion,
An anti-freezing agent adding device for adding an anti-freezing agent is provided for the packing around the foreign matter,
2. The shield machine according to claim 1 , wherein after the antifreezing agent is added to the packing around the foreign matter, the freezing device freezes the packing around the packing added with the antifreezing agent. A partition plate for partitioning an inner side of the outer cylinder portion whose front portion opens and a front outer side portion of the outer cylinder portion, and a cutter portion for excavating the ground in front of the outer cylinder portion are provided, the partition plate and the cutter portion, A chamber is formed between the chambers, and the filling material is retained in the chamber,
A freezing device is provided that forms an ice valve that freezes the packing taken into the chamber and prevents the inflow of groundwater into the outer cylinder portion,
The freezing device, a shield machine, characterized in that provided on at least one of the partition plate and the cutter unit. A partition plate for partitioning an inner side of the outer cylinder portion whose front portion opens and a front outer side portion of the outer cylinder portion, and a cutter portion for excavating the ground in front of the outer cylinder portion are provided, the partition plate and the cutter portion, A chamber is formed between the chambers, and the filling material is retained in the chamber,
A freezing device is provided that forms an ice valve that freezes the packing taken into the chamber and prevents the inflow of groundwater into the outer cylinder portion,
The cutter unit includes a cutter head that is rotatable around an axis along the extending direction of the outer cylinder unit,
A shield machine, wherein the freezing device is attached to the cutter head. An attachment device is provided that is attached to the partition plate and communicates between the chamber and the inside of the outer cylinder portion by being removed from the partition plate,
5. The shield machine according to claim 3 , wherein the freezing device forms an ice valve by freezing a filler interposed between the chamber and the accessory device. A partition plate that divides the inside of the outer cylinder part that opens at the front part from the front outer part of the outer cylinder part and a cutter part that excavates the ground in front of the outer cylinder part are provided, and the partition plate and the cutter part In removing the foreign matter that has entered the chamber in the shield machine in which a chamber is formed between the chamber and the filler is retained in the chamber,
An ice valve that freezes the filling taken into the chamber and prevents the filling from flowing into the outer tube portion is formed by a freezing device ,
A method for removing foreign matter in a chamber, wherein the foreign matter is removed after the ice valve is formed around the foreign matter when the foreign matter enters the chamber. Adding an antifreeze to the packing around the foreign material, and subsequently freezing the packing around the packing to which the antifreeze was added,
The method for removing foreign matter in the chamber according to claim 6 , wherein the foreign matter is removed together with the frozen filling.

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