JP5585073B2 - Water stop structure and water stop method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a water stop structure and a water stop method for preventing water from flowing from a well opening into a shaft when a shield machine passes through a well opening provided in the shaft and enters the shaft.

  In general, as a water stop method to prevent water from flowing into the shaft when the shield machine enters the shaft, filling of soil mortar or the like between the bulkhead installed in the shaft and the shaft The material is filled and hardened, and then the shaft head of the shaft and the hardened filling material are excavated with a shield machine to reach the shield machine into the shaft.

  Further, for example, Patent Document 1 discloses a method of constructing a water stop structure by cooling and freezing a filler filled between a wellhead and a partition wall.

JP 2004-270252 A

However, in the above-described method of filling the filler between the bulkhead and the wellhead, when the shield machine excavates the filler and reaches just before the bulkhead, the bulkhead and the filler are removed, and packing is put on the outer periphery of the shield machine. Although it has to be attached, there is a possibility that water may flow in since water stoppage is not ensured for a short time after the partition wall and the filler are removed and the packing is attached.
Moreover, in the method described in Patent Document 1 described above, the equipment for cooling and thawing the filler is large, and the capital investment cost is enormous, and it takes time to freeze and thaw the filler, and the construction period is long. There was a problem of becoming longer.

  Accordingly, the present invention has been made in view of the above-described problems, and is a water-stop structure that can efficiently solidify and melt a filler in a short time and can ensure water-stopping. And it aims at providing the construction method.

The present invention is a water stop structure that prevents water from flowing into the shaft when the shield machine passes through the shaft provided in the shaft and enters the shaft.
A partition wall installed in the shaft at a predetermined interval from the wellhead,
A cylinder having an inner diameter larger than the outer diameter of the shield machine, one end connected to the partition wall and the other end connected to the wellhead;
A meltable filler interposed between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the shield machine;
An outer peripheral edge is connected to the cylindrical body, and a ring-shaped sealing material provided so as to be able to contact over the entire circumference of the outer peripheral surface of the shield machine;
Melting means for melting the filler;
Equipped with a,
The sealing material is made of an elastic material, embedded in the filler in a state in which an elastic force in a direction to be pressed against the outer peripheral surface of the shield machine acts, and when the filler is melted, the sealing material is shielded by the elastic force. It is configured to abut the outer peripheral surface of the features that you have.

The present invention is a water stop structure that prevents water from flowing into the shaft when the shield machine passes through the shaft provided in the shaft and enters the shaft.
A meltable filler interposed between the inner peripheral surface of the wellhead and the outer peripheral surface of the shield machine;
An outer peripheral edge is connected to the wellhead, and a ring-shaped sealing material provided so as to be able to contact the entire circumference of the outer peripheral surface of the shield machine;
Melting means for melting the filler;
It is characterized by providing.

According to the two inventions described above, by melting the filler by the melting means, a gap can be formed around the sealing material, and the outer peripheral surface of the shield machine can be exposed. In such a state, when the sealing material abuts on the outer peripheral surface of the shield machine, water can be stopped between the outer peripheral surface of the shield machine and the inner peripheral surface of the cylinder or the wellhead.
Therefore, after the shield machine has entered the shaft, water is always stopped between the outer peripheral surface of the shield machine and the inner peripheral surface of the cylinder or the wellhead, so the work in the shaft must be carried out safely. Can do.
Further, in the present invention, by using a filler capable of maintaining a solid state at normal temperature (a general temperature in a shaft, which is about 20 ° C. to 25 ° C.), it is frozen after being filled, etc. Solidification work becomes unnecessary. Therefore, the working time can be shortened compared with the case of freezing the filler. Furthermore, since there is no need for equipment for solidifying or melting the filler, capital investment costs can be reduced.

  Further, in the present invention, provided between the inner peripheral surface of the cylindrical body or the wellhead and the outer peripheral surface of the shield machine, one end portion or a central portion is rotatably connected to the tubular body or the wellhead, It is good also as providing the adjustment means to which the other end part was connected to the said sealing material.

  If it does in this way, a sealing material can be made to contact | abut strongly to the outer peripheral surface of a shield machine, or can be spaced apart from the outer peripheral surface of a shield machine by rotating an adjustment means. Therefore, when there is no risk of water intrusion, the sealing material is separated to reduce wear of the sealing material. Can be improved.

In the present invention, the adjusting means includes
A support attached to the cylinder or the wellhead;
A plate-like member having one end or a central portion rotatably connected to the support and the other end connected to the sealing material;
A cord-like body inserted through the one end of the plate-like member;
It is good also as providing.

Further, the present invention is a water stop structure that prevents water from flowing into the shaft from the shaft when the shield machine passes through the shaft provided in the shaft and enters the shaft.
A partition wall installed in the shaft at a predetermined interval from the wellhead,
A cylinder having an inner diameter larger than the outer diameter of the shield machine, one end connected to the partition wall and the other end connected to the wellhead;
A meltable filler interposed between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the shield machine;
An outer peripheral edge is connected to the cylindrical body, and a ring-shaped sealing material provided so as to be able to contact over the entire circumference of the outer peripheral surface of the shield machine;
Melting means for melting the filler;
With
The filler is any one of higher alcohol, higher fatty acid, fatty acid ester,
The melting means includes a heating device for heating the filler.

  According to the present invention, the filler can be reused. Further, since a melting agent is used, a large amount of filler can be melted in a short time.

In the present invention, the filler is any one of a higher alcohol, a higher fatty acid, and a fatty acid ester,
The melting means may include a heating device for heating the filler.

  According to the present invention, higher alcohols, higher fatty acids, and fatty acid esters are biodegradable and are decomposed into water and air over time, and thus do not adversely affect the environment.

Further, the present invention is a water stop method for preventing water from flowing into the shaft from the shaft when the shield machine passes through the shaft provided in the shaft and enters the shaft.
A bulkhead installation step of installing a bulkhead in the shaft separated from the wellhead by a predetermined interval;
A cylinder installation step of connecting one end of a cylinder having an inner diameter larger than the outer diameter of the shield machine to the partition wall, and connecting the other end to the shaft of the construction planned location of the wellhead,
A sealing material installation step of connecting an outer peripheral edge portion of a ring-shaped sealing material to the cylindrical body, and disposing an inner peripheral edge portion between an inner peripheral surface of the cylindrical body and an outer peripheral surface of the shield machine,
A filling step of filling the cylinder with a meltable filler and curing;
While entering the cylinder while excavating the planned construction site of the wellhead with the shield machine, an entry step to stop when reaching a predetermined position,
A melting step of removing a part of the cured filler by melting and forming a gap in the filler;
An abutting step of bringing an inner peripheral edge of the sealing material into contact with an outer peripheral surface of the shield machine;
Equipped with a,
The sealing material is made of an elastic material,
In the filling step, the sealing material is embedded in the filling material in a state in which an elastic force in a direction pressed against the outer peripheral surface of the shielding machine acts on the sealing material,
In the abutting step, a gap is formed in the filler in the melting step, so that the sealing material can be restored by the elastic force, so that the inner peripheral edge of the sealing material is positioned on the outer peripheral surface of the shield machine. It makes it contact | abut .

Further, the present invention is a water stop method for preventing water from flowing into the shaft from the shaft when the shield machine passes through the shaft provided in the shaft and enters the shaft.
A widening portion for forming a widening portion having an inner diameter larger than the outer diameter of the wellhead at a planned construction location of the wellhead, from the inner peripheral surface of the retaining wall to a predetermined depth position in the retaining wall of the shaft. Forming process;
A sealing material installation step of connecting an outer peripheral edge of a ring-shaped sealing material to the wellhead and disposing an inner peripheral edge between the inner peripheral surface of the wellhead and the outer peripheral surface of the shield machine,
A filling step of filling and hardening a meltable filler in the widened portion;
While entering the shaft while excavating the planned construction site of the wellhead with the shield machine, an entry step to stop when reaching a predetermined position,
A melting step of removing a part of the cured filler by melting and forming a gap in the filler;
An abutting step of bringing an inner peripheral edge of the sealing material into contact with an outer peripheral surface of the shield machine;
It is characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, the water stop structure which can solidify and fuse | melt a filler efficiently in a short time, and can ensure water stop, and its construction method can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the water stop structure which concerns on 1st embodiment of this invention, and has shown the state which the front-end | tip of the shield machine penetrated the earth retaining wall of a shaft and reached the cylinder. It is the A section enlarged view of FIG. FIG. 3 is a view taken in the direction of arrow B in FIG. 2. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a side view which shows the state which the shield machine passed through the cylinder. It is a side view which shows the water stop structure which concerns on 2nd embodiment of this invention, and expands the shaft side upper part of a wellhead. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the construction method of the water stop structure which concerns on this embodiment. It is a figure which shows the state which attached the heating apparatus to the internal peripheral surface of the skin plate of a shield machine.

  Hereinafter, preferred embodiments of the water stop structure 1 according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing the water stop structure 1 according to the first embodiment of the present invention, and shows a state in which the tip of the shield machine 5 penetrates the earth retaining wall 3a of the shaft 3 and reaches the inside of the cylindrical body 6. ing. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is a view as seen from the direction of arrow B in FIG.

  As shown in FIGS. 1 to 3, the water stop structure 1 that prevents water from flowing into the shaft 3 from the wellhead 2 includes a partition wall 4 installed in the shaft 3 at a predetermined interval from the wellhead 2. A cylindrical body 6 having an inner diameter larger than the outer diameter of the shield machine 5, one end connected to the partition wall 4 and the other end connected to the wellhead 2, the inner peripheral surface of the cylindrical body 6, and the outer peripheral surface of the shield machine 5 A ring 7 provided between the inner peripheral surface of the cylindrical body 6 and the outer peripheral surface of the shield machine 5, which has an inner diameter smaller than the outer diameter of the shield machine 5. Elastic sealing material 8, adjusting means 9 provided between the inner peripheral surface of the cylinder 6 and the outer peripheral surface of the shield machine 5 and connected to the elastic sealing material 8, and a melting agent for melting the filler 7 And a melting means 10 for supplying.

  The shaft 3 is surrounded by a cylindrical earth retaining wall 3a, and concrete is placed on the bottom base 3b.

In the situation before the shield machine 5 enters the shaft 3, the fluidized soil 11 is entirely filled in the partition wall side end portion 6a of the cylindrical body 6, and in the center portion 6b and the well end side end portion 6c. The outer peripheral portion is filled with the filler 7, and the fluidized soil 11 is filled therein. The central portion 6b and the well end side end portion 6c are first filled with the filler 7 in the outer peripheral portion of the cylindrical body 6 and cured, and then the fluidized soil 11 is placed inside the cured cylindrical filler 7. It is constructed by filling (not shown).
Then, the fluidized soil 11 at the central portion 6b and the well end 6c is removed by excavation by the shield machine 5, and only the outer peripheral filler 7 is left around the shield machine 5 as shown in FIG. Is done. In the present embodiment, the fluidized soil 11 at the partition wall side end 6a is left without being excavated.

  In the present embodiment, polystyrene foam is used as the filler 7. Styrofoam can be melted with a predetermined melting agent (for example, petroleum-based SRP solvent (sold by Saijo Shoji Co., Ltd.)).

  A support device 12 is provided in the shaft 3 to support the filler 7 and the partition wall 4 with respect to the propulsive force of the shield machine 5 when the shield machine 5 digs through the cylindrical body 6.

  The support device 12 is provided between the support material 20 that supports the partition 4 so that the partition 4 does not move with respect to the propulsive force of the shield machine 5, and the partition 4 and the earth retaining wall 3 a. The jack 13 for transmitting to the support material 20 is comprised.

  The elastic sealing material 8 is made of natural rubber or resin having elasticity and excellent wear resistance, and the inner diameter thereof is formed to be slightly smaller than the outer diameter of the shield machine 5.

  The elastic sealing material 8 is bent between the inner peripheral surface of the cylindrical body 6 and the outer peripheral surface of the shield machine 5 so that the vertical cross-sectional shape is substantially L-shaped. It arrange | positions so that it may approach to the shield machine 5 gradually toward 2 side. That is, since the elastic force is always acting on the well end side end portion 8c of the elastic sealing material 8 in the direction in which the elastic sealing material 8 is pressed against the outer peripheral surface of the shield machine 5, the well end side end part 8c is connected to the shield machine 5. It can be made to contact | abut to the outer peripheral surface.

  The elastic sealing material 8 in the filler 7 before being melted by the melting agent is embedded in the filler 7 in a state in which the well end side end portion 8c of the elastic sealing material 8 is bent in the radially outward direction. However, when the filler 7 around the elastic sealing material 8 is melted by the melting agent, the well end 8c is restored to the direction close to the outer peripheral surface of the shield machine 5 by the elastic force.

  The adjusting means 9 includes a support 14 connected to a reinforcing rib 6d provided on the inner peripheral surface of the cylindrical body 6, and a central portion 15b connected to the lower end of the support 14 so as to be rotatable. The part 15c includes a plate-like member 15 connected to the elastic sealing material 8, and a cord-like body 16 that passes through the partition wall-side end 15a of the plate-like member 15. A plurality of adjusting means 9 are provided at predetermined intervals along the circumferential direction of the cylindrical body 6.

  A partition wall side end portion 8a of the elastic sealing material 8 is sandwiched between the support 14 and the reinforcing rib 6d, and is detachably connected to the reinforcing rib 6d with bolts and nuts penetrating them. ing. Thereby, when the cylinder 6 is disassembled, the support 14 and the elastic sealing material 8 can be detached from the cylinder 6.

  The plate-like member 15 is arranged so that its longitudinal direction is substantially parallel to the axial direction of the cylindrical body 6, and its central portion 15 b is rotatably connected to the support tool 14. The cylindrical body 6 can be rotated in the radial direction around the central portion 15b.

Since the well-end-side end 15c of the plate-like member 15 is attached so as to be in close contact with the elastic sealing material 8 with an adhesive or the like, by rotating the well-end-side end 15c in the direction close to the shield machine 5, The elastic sealing material 8 can be brought into strong contact with the outer peripheral surface of the shield machine 5.
In addition, when water flows in from the wellhead 2 side, the water pressure acts in a direction in which the elastic sealing material 8 is pressed against the outer peripheral surface of the shield machine 5, so that water can be reliably stopped.

  A through hole 17 is provided in the partition wall side end portion 15 a of each plate-like member 15, and a single cord-like body 16 is spanned in each through hole 17. In the present embodiment, a wire rope is used as the cord-like body 16, but is not limited to this, and any cord-like material may be used.

  By tightening both ends of the cord-like body 16, the partition wall side end 15 a of each plate-like member 15 is rotated in a direction approaching the shield machine 5. As a result, the well end side end 15 c rotates in a direction away from the shield machine 5, so that the elastic sealing material 8 is separated from the outer peripheral surface of the shield machine 5.

  The melting means 10 includes a storage tank 18 that stores a melting agent for melting the filler 7, and a supply pipe 19 that is connected to the storage tank 18 at one end and supplies the melting agent.

  The other end of the feeding pipe 19 is connected to the outer periphery of the cylindrical body 6 in the vicinity of the well end side end portion 8c of the elastic sealing material 8. Therefore, when the melting agent is supplied into the cylindrical body 6, the filler 7 around the well end 8c is intensively melted to form a gap, and the plate-like member 15 can be rotated in the gap. It becomes. That is, the elastic sealing material 8 attached to the end 15c of the plate-like member 15 is restored by its elastic force in the direction approaching the shield machine 5 and can come into contact with the outer peripheral surface of the shield machine 5. Is. In such a case, the elastic sealing material 8 can be brought into strong contact with the outer peripheral surface of the shield machine 5 by rotating the partition wall side end 15 a of the plate-like member 15 in a direction away from the shield machine 5.

Next, the construction method of the water stop structure 1 which concerns on this embodiment is demonstrated according to a construction procedure.
4-10 is a figure which shows the construction method of the water stop structure 1 concerning this embodiment.

First, as shown in FIG. 4, the partition 4 is installed in the shaft 3 at a predetermined interval from the inner peripheral surface of the earth retaining wall 3a (partition installation step).
Moreover, it supports with the support apparatus 12 so that this partition 4 may not fall down.

And the cylinder 6 is installed so that one end may contact | abut to the partition 4 and the other end may contact | abut to the inner peripheral surface of the earth retaining wall 3a of the well opening construction planned location 2a (cylinder installation process).
Further, in parallel with the installation work of the partition wall 4 and the installation work of the cylindrical body 6, water stoppage measures such as forming a ground improvement body 25 by injecting a chemical material into the natural ground E near the wellhead construction planned location 2 a. carry out.

  Next, in the state in which the well end side end portion 8c of the elastic sealing material 8 is bent in the radially outward direction, the center portion 6b side is slightly closer to the boundary between the partition wall side end portion 6a and the center portion 6b in the cylindrical body 6. The elastic sealing material 8 and the adjusting means 9 are installed in (an elastic sealing material installation step).

  And the filling material 7 and the fluidized soil 11 are each filled in the well end side end part 6c in the cylinder 6, and next, the fluidized soil 11 is filled in the partition side edge part 6a (filling process).

  Next, as shown in FIG. 5, the shield machine 5 is dug from the ground E toward the vertical shaft 3, the wellhead construction planned location 2 a of the retaining wall 3 a is excavated, and the shield machine 5 is connected to the cylindrical body 6. Enter inside.

  Next, as shown in FIG. 6, the shield machine 5 reaches a position where the tip of the skin plate 22 of the shield machine 5 passes through the elastic sealant 8 and the elastic sealant 8 can come into contact with the tip of the skin plate 22. When 5 proceeds, the excavation is stopped (entrance process).

  FIG. 7 is an enlarged view of a portion C in FIG. As shown in FIG. 7, the melting agent is supplied to the vicinity of the end 8 c of the elastic sealing material 8 through the feed pipe 19 connected to the cylindrical body 6. When the melting agent comes into contact with the filler 7, the filler 7 starts to melt (melting step). As the filler 7 melts, a gap is formed in the vicinity of the end 8c of the elastic sealing material 8. In such a case, the molten filler 7 flows along the outer peripheral surface of the shield machine 5 to the bottom of the cylindrical body 6 and is fed to the collection tank through a water collection pipe (not shown). The filler 7 stored in the collection tank is transported to the recycling factory and reused.

  When the supply of the melting agent is continued as shown in FIG. 8, the gap gradually widens and the well end side end portion 8 c of the elastic sealing material 8 starts to be restored in the direction approaching the shield machine 5.

  Further, when the supply of the melting agent is continued, as shown in FIG. 9, the melting of the filler 7 in the cylindrical body 6 proceeds, the outer peripheral surface of the shield machine 5 is exposed, and the elastic force of the elastic sealing material 8 is increased. Thus, the well-end side end 8c comes into contact with the outer peripheral surface (contact process). Moreover, the well end side end 15c of the plate-like member 15 is rotated in the direction approaching the shield machine 5, and the well end side end 8c of the elastic sealing material 8 is brought into strong contact with the outer peripheral surface of the shield machine 5 so as to be in close contact therewith. .

  In such a state, even if water flows from the inside of the natural ground E between the outer periphery of the shield machine 5 and the inner peripheral surface of the cylindrical body 6, the earth and water pressure causes the shield-side end portion 8 c of the elastic sealing material 8 to pass through the shield machine. Since it acts in the direction pressed against the outer peripheral surface of 5, the water stop effect by the elastic sealing material 8 can be enhanced. Thereby, it can prevent efficiently that water flows in into the shaft 3.

  In the present embodiment, the case where the elastic sealing material 8 is brought into contact with the outer peripheral surface of the shield machine 5 using the restoring force has been described. However, the present invention is not limited to this, and a sealing made of another material is used. The material is attached to the well end side end portion 15c of the plate-like member 15 in the same manner as the elastic sealing material 8, and the partition wall side end portion 15a of the plate-like member 15 is rotated in a direction away from the shield machine 5, thereby By rotating the portion 15c in the direction approaching the shield machine 5, the sealing material can be brought into contact with the outer peripheral surface of the shield machine 5 to exert a water stop function.

  Thereafter, as shown in FIG. 10, the support device 12 and the fluidized soil 11 existing in front of the shield machine 5 are removed, and the shield machine 5 is allowed to travel. The cylinder 6 is left behind.

  Next, the shield machine 5 is moved into the shaft 3 while the elastic sealing material 8 is in contact with the outer peripheral surface of the shield machine 5. In this state, even if water flows between the cylinder 6 and the shield machine 5, the elastic sealing material 8 is in contact with the outer peripheral surface of the shield machine 5, so that water can be stopped. Moreover, when the inflow of the water into the cylinder 6 is confirmed, the progress of the shield machine 5 is stopped and the said water stop countermeasure is implemented again.

  In addition, when there is no possibility of water flowing in from the wellhead 2 due to water stoppage measures, both ends of the cord-like body 16 are tightened so that the partition wall side end portions 15a of the plate-like members 15 are close to the shield machine 5. You may advance the shield machine 5 in the state rotated. This is because the partition-side end 15a of the plate-like member 15 is rotated in a direction close to the shield machine 5 so that the well-end end 15c is rotated in a direction away from the shield machine 5, so that an elastic sealing material is used. The wellhead side end portion 8 c of 8 is also separated from the outer peripheral surface of the shield machine 5. That is, the elastic sealing material 8 can be separated from the outer peripheral surface of the shield machine 5 by tightening both ends of the cord-like body 16. Thereby, abrasion of the elastic sealing material 8 can be prevented.

FIG. 11 is a side view showing a state in which the shield machine 5 has passed through the cylindrical body 6.
As shown in FIG. 11, since the shield machine 5 proceeds while constructing the segment 26 behind the shield machine 5, the end of the elastic sealing material 8 on the wellhead side even after the shield machine 5 has passed through the cylindrical body 6. Since the part 8c contacts the outer peripheral surface of the segment 26, the water stop function can be maintained.

  After the shield machine 5 passes, the wellhead 2 is processed by a method determined in advance by design or the like, and the adjusting means 9 is collected.

  According to the water stop structure 1 in the present embodiment described above, since the melting means 10 is provided, the filler 7 filled between the outer peripheral surface of the shield machine 5 and the inner peripheral surface of the cylindrical body 6 is melted. can do. Moreover, since the melting operation in the melting means 10 can be performed in a short time, the working efficiency is excellent.

  Further, by melting the filler 7, it is possible to form a gap in which the elastic sealing material 8 can be restored between the inner peripheral surface of the cylindrical body 6 and the outer peripheral surface of the shield machine 5, and the shield machine 5. Can be exposed. Then, by utilizing the elastic force of the elastic sealing material 8, the well end side end portion 8 c of the elastic sealing material 8 is brought into contact with the outer peripheral surface of the shield machine 5, so that the outer peripheral surface of the shield machine 5 and the inner circumference of the cylindrical body 6 are Water can be stopped between the surfaces. Furthermore, the waterstop can be improved by using the plate-like member 15 to strongly contact the well end 8c with the outer peripheral surface of the shield machine 5.

  Therefore, after the shield machine 5 enters the shaft 3, the space between the outer peripheral surface of the shield machine 5 and the inner peripheral surface of the cylindrical body 6 is always stopped, so that the work in the shaft 3 can be performed safely. Can be implemented.

  Further, by rotating the plate-like member 15, the well end side end portion 8 c of the elastic sealing material 8 can be moved, so that the elastic sealing material 8 is brought into contact with the outer peripheral surface of the shield machine 5 or the outer periphery of the shield machine 5. It can be separated from the surface. Therefore, when there is no water intrusion, the elastic sealing material 8 is separated from the outer peripheral surface of the shield machine 5, and when there is a risk of water intrusion, the elastic sealing material 8 is placed on the outer peripheral surface of the shield machine 5. It can be made to contact.

  Next, a second embodiment of the present invention will be described. In the following description, portions corresponding to the first embodiment are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described. The adjusting means 9 of the second embodiment is left in the wellhead 2 without being collected.

FIG. 12 is a side view showing the water stop structure 21 according to the second embodiment of the present invention, and is an enlarged view of the upper portion of the shaft 2 on the shaft 3 side.
As shown in FIG. 12, the water stop structure 21 includes a filler 7 interposed between the inner peripheral surface of the wellhead 2 and the outer peripheral surface of the shield machine 5, the inner peripheral surface of the wellhead 2, and the outer peripheral face of the shield machine 5. And an elastic sealing material 8 provided between the elastic sealing material 8, an adjusting means 9 connected to the elastic sealing material 8, and a melting means 10.

  The adjusting means 9 includes a support 14 attached to the inner peripheral surface of the earth retaining wall 3 a, a plate-like member 15, and a cord-like body 16, and is provided in the widened portion 23 having a larger diameter than the wellhead 2. It has been.

  One end 8d of the elastic sealing material 8 is sandwiched between the support 14 and the inner peripheral surface of the earth retaining wall 3a, and the inner circumference of the earth retaining wall 3a is detachable with bolts penetrating them. Connected to the surface.

Next, the construction method of the water stop structure 21 according to the present embodiment will be described according to the construction procedure.
FIG.13 and FIG.14 is a figure which shows the construction method of the water stop structure 21 concerning this embodiment.

First, as shown in FIG. 13, a ring-shaped widened portion 23 having an outer diameter larger than the outer diameter of the wellhead 2 is formed in the earth retaining wall 3a (a widened portion forming step).
Next, the adjusting means 9 to which the elastic sealing material 8 is connected is installed on the outer peripheral edge of the widened portion 23 (elastic sealing material installation step). Moreover, it supports with the support apparatus 12 so that the earth retaining wall 3a may not fall down.

  Next, the meltable filler 7 is filled in the widened portion 23 and cured (filling step). If the filler 7 hardens | cures, the shield machine 5 will be dug toward the vertical shaft 3 from the natural ground E, and the wellhead construction planned location 2a of the earth retaining wall 3a will be excavated. Further, as shown in FIG. 14, the shield machine 5 advances, the tip of the skin plate 22 of the shield machine 5 passes through the elastic sealant 8, and the elastic sealant 8 contacts the tip of the skin plate 22. When the shield machine 5 enters to a position where it can be made, the excavation is stopped (entry process).

  Next, the melting agent is supplied into the widened portion 23 through the feed pipe 19. By supplying the melting agent, the filler 7 is melted (melting step).

  When the filler 7 around the elastic sealant 8 is melted (see FIG. 12), a gap is formed in the vicinity of the elastic sealant 8, the outer peripheral surface of the shield machine 5 is exposed, and the other end of the elastic sealant 8 is exposed. The portion 8e comes into contact with the outer peripheral surface of the shield machine 5 (contact process).

  Next, the support device 12 is removed while the elastic sealing material 8 is in contact with the outer peripheral surface of the shield machine 5, and the shield machine 5 is moved into the shaft 3. In such a state, even if water flows between the wellhead 2 and the shield machine 5, the other end portion 8 e of the elastic sealing material 8 is in contact with the outer peripheral surface of the shield machine 5, so that water can be stopped.

Further, the shield machine 5 is advanced to pass through the wellhead 2. At this time, since the shield machine 5 advances while constructing the segment 26 behind the shield machine 5, even if the shield machine 5 passes through the wellhead 2, the elastic sealing material 8 contacts the outer peripheral surface of the segment 26. Therefore, the water stop function can be maintained.
After the shield machine 5 has passed, the elastic sealing material 8 and the adjusting means 9 are filled with mortar or the like in the state where the elastic sealing material 8 and the adjusting means 9 are installed, and the elastic sealing material 8 and the adjusting means 9 are embedded. .

  According to the water stop structure 21 in the present embodiment described above, since the melting means 10 is provided, the filler 7 filled between the outer peripheral surface of the shield machine 5 and the inner peripheral surface of the wellhead 2 is melted. be able to. Moreover, since the melting operation in the melting means 10 can be performed in a short time, the working efficiency is excellent. And the outer peripheral surface of the shield machine 5 can be exposed by melting the filler 7.

  Then, the elastic sealing material 8 is restored by its elastic force and brought into contact with the outer peripheral surface of the shield machine 5, thereby stopping water between the outer peripheral surface of the shield machine 5 and the inner peripheral surface of the wellhead 2. it can.

  Therefore, after the shield machine 5 enters the shaft 3 from the wellhead 2, the water is always stopped between the outer peripheral surface of the shield machine 5 and the inner peripheral surface of the wellhead 2. Work can be carried out.

  Further, in each of the above-described embodiments, the case where the polystyrene foam is used as the filler 7 has been described. However, the present invention is not limited to this, and an additive containing a higher alcohol lauryl alcohol (for example, Calcoal 2098 (product name , Calcoal: registered trademark, manufactured by Kao Corporation) and higher fatty acid lauric acid (for example, LUNAC L-70 (product name, LUNAC: registered trademark, manufactured by Kao Corporation)), stearic acid ester of fatty acid ester, etc. These may be in a solid state at around 20 ° C., which is a normal temperature in the shaft 3, and have a uniaxial compressive strength (for example, about 0.5 to 1.0 MPa) similar to the natural ground E, The inside of the shaft 3 becomes higher than the normal temperature and has a melting point (for example, 24 ° C to 27 ° C in the case of Calcoal 2098, 32 in the case of Lunac L-70). Becomes a ~ 36 ° C.) or higher, since the fluid state by melting each be handled in the same manner as Styrofoam. In addition, since higher alcohol lauryl alcohol, higher fatty acid lauric acid and fatty acid ester stearate are biodegradable, they are decomposed into water and air over time and do not adversely affect the environment.

  Since higher alcohol lauryl alcohol, higher fatty acid lauric acid and fatty acid ester stearate are general raw materials, the raw materials are easily available.

FIG. 15 is a view showing a state where a heating device is attached to the inner peripheral surface of the skin plate 22 of the shield machine 5.
As shown in FIG. 15, when the above higher alcohol or the like is used as the filler 7, a Peltier element as a heating device is attached to the inner peripheral surface of the skin plate 22 of the shield machine 5 as the melting means 24. The Peltier element heats the skin plate 22 by changing the direction of the current flowing through the Peltier element, and heats the filler 7 via the skin plate 22. Note that, at a normal temperature in the shaft 3, the filler 7 is in a solid state and can be excavated by the shield machine 5.

  Then, the shield machine 5 is advanced from the ground E to the shaft 3, the tip of the skin plate 22 of the shield machine 5 passes through the elastic sealant 8, and the elastic sealant 8 is at the tip of the skin plate 22. When the shield machine 5 advances to a position where contact is possible, the excavation is stopped.

  Next, electricity is applied to heat the skin plate 22 in contact with the Peltier element, and the filler 7 is heated via the skin plate 22. Since the filler 7 gradually melts when heated, the melted filler 7 is recovered by a method determined in advance by design or the like and reused. When the filler 7 melts, a gap is formed between the outer peripheral surface of the shield machine 5 and the cylindrical body 6, and the elastic sealing material 8 comes into contact with the outer peripheral surface of the shield machine 5.

  In such a case, since the melting means 24 includes a heating device for heating the filler 7, the filler 7 can be brought into a fluid state in a short time.

  In addition, in each embodiment mentioned above, although the case where it penetrates the earth retaining wall 3a was demonstrated, it is not limited to this, It is applicable also when penetrating the housing of the constructed structure.

DESCRIPTION OF SYMBOLS 1 Water stop structure 2 Wellhead 2a Wellhead construction location 3 Vertical shaft 3a Earth retaining wall 3b Bottom plate 4 Bulkhead 5 Shielding machine 6 Cylindrical body 6a Bulkhead side end 6b Center part 6c Wellhead side end 6d Reinforcing rib 7 Filler 8 Elastic sealing Material 8a Bulkhead side end portion 8c Wellhead side end portion 8d One end portion 8e Other end portion 9 Adjusting means 10 Melting means 11 Fluidized soil 12 Support device 13 Jack 14 Supporting tool 15 Plate-like member 15a Partition side end 15b Central portion 15c Wellhead side end 16 Cord-like body 17 Through hole 18 Reservoir 19 Feed pipe 20 Supporting work material 21 Water stop structure 22 Skin plate 23 Widening part 24 Melting means 25 Ground improvement body 26 Segment E Ground

Claims (8)

When the shield machine passes through the wellhead provided in the shaft and enters the shaft, the water stop structure prevents water from flowing into the shaft from the wellhead,
A partition wall installed in the shaft at a predetermined interval from the wellhead,
A cylinder having an inner diameter larger than the outer diameter of the shield machine, one end connected to the partition wall and the other end connected to the wellhead;
A meltable filler interposed between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the shield machine;
An outer peripheral edge is connected to the cylindrical body, and a ring-shaped sealing material provided so as to be able to contact over the entire circumference of the outer peripheral surface of the shield machine;
Melting means for melting the filler;
Equipped with a,
The sealing material is made of an elastic material, embedded in the filler in a state in which an elastic force in a direction to be pressed against the outer peripheral surface of the shield machine is applied, and when the filler is melted, the sealing material is water shut-off structure characterized that you have been configured so as to contact the outer peripheral surface of the shield machine. When the shield machine passes through the wellhead provided in the shaft and enters the shaft, the water stop structure prevents water from flowing into the shaft from the wellhead,
A meltable filler interposed between the inner peripheral surface of the wellhead and the outer peripheral surface of the shield machine;
An outer peripheral edge is connected to the wellhead, and a ring-shaped sealing material provided so as to be able to contact the entire circumference of the outer peripheral surface of the shield machine;
Melting means for melting the filler;
A water-stop structure comprising:   Provided between the inner peripheral surface of the cylindrical body or the wellhead and the outer peripheral surface of the shield machine, one end or the center is pivotally connected to the cylindrical body or the wellhead, and the other end is the sealing The water stop structure according to claim 1, further comprising adjusting means connected to the material. The adjusting means includes
A support attached to the cylinder or the wellhead;
A plate-like member having one end or a central portion rotatably connected to the support and the other end connected to the sealing material;
A cord-like body inserted through the one end of the plate-like member;
The water stop structure according to claim 3, comprising: The filler is a polystyrene foam,
The melting means includes a melting agent for melting the filler, and a feed pipe that supplies the melting agent from the position on the outer peripheral side of the sealing material in the cylinder to the cylinder. The water stop structure according to claim 1 or 2. When the shield machine passes through the wellhead provided in the shaft and enters the shaft, the water stop structure prevents water from flowing into the shaft from the wellhead,
A partition wall installed in the shaft at a predetermined interval from the wellhead,
A cylinder having an inner diameter larger than the outer diameter of the shield machine, one end connected to the partition wall and the other end connected to the wellhead;
A meltable filler interposed between the inner peripheral surface of the cylindrical body and the outer peripheral surface of the shield machine;
An outer peripheral edge is connected to the cylindrical body, and a ring-shaped sealing material provided so as to be able to contact over the entire circumference of the outer peripheral surface of the shield machine;
Melting means for melting the filler;
With
The filler is any one of higher alcohol, higher fatty acid, fatty acid ester,
The melting means, the water stopping structure you further comprising a heating device for heating the filling material. When the shield machine passes through the wellhead provided in the shaft and enters the shaft, the water stop method prevents water from flowing into the shaft from the wellhead,
A bulkhead installation step of installing a bulkhead in the shaft separated from the wellhead by a predetermined interval;
A cylinder installation step of connecting one end of a cylinder having an inner diameter larger than the outer diameter of the shield machine to the partition wall, and connecting the other end to the shaft of the construction planned location of the wellhead,
A sealing material installation step of connecting an outer peripheral edge portion of a ring-shaped sealing material to the cylindrical body, and disposing an inner peripheral edge portion between an inner peripheral surface of the cylindrical body and an outer peripheral surface of the shield machine,
A filling step of filling the cylinder with a meltable filler and curing;
While entering the cylinder while excavating the planned construction site of the wellhead with the shield machine, an entry step to stop when reaching a predetermined position,
A melting step of removing a part of the cured filler by melting and forming a gap in the filler;
An abutting step of bringing an inner peripheral edge of the sealing material into contact with an outer peripheral surface of the shield machine;
Equipped with a,
The sealing material is made of an elastic material,
In the filling step, the sealing material is embedded in the filling material in a state in which an elastic force in a direction pressed against the outer peripheral surface of the shielding machine acts on the sealing material,
In the abutting step, a gap is formed in the filler in the melting step, so that the sealing material can be restored by the elastic force, so that the inner peripheral edge of the sealing material is positioned on the outer peripheral surface of the shield machine. The water stop method characterized by making it contact | abut . When the shield machine passes through the wellhead provided in the shaft and enters the shaft, the water stop method prevents water from flowing into the shaft from the wellhead,
A widening portion for forming a widening portion having an inner diameter larger than the outer diameter of the wellhead at a planned construction location of the wellhead, from the inner peripheral surface of the retaining wall to a predetermined depth position in the retaining wall of the shaft. Forming process;
A sealing material installation step of connecting an outer peripheral edge of a ring-shaped sealing material to the wellhead and disposing an inner peripheral edge between the inner peripheral surface of the wellhead and the outer peripheral surface of the shield machine,
A filling step of filling and hardening a meltable filler in the widened portion;
While entering the shaft while excavating the planned construction site of the wellhead with the shield machine, an entry step to stop when reaching a predetermined position,
A melting step of removing a part of the cured filler by melting and forming a gap in the filler;
An abutting step of bringing an inner peripheral edge of the sealing material into contact with an outer peripheral surface of the shield machine;
A water stop method characterized by comprising: