JPH0274788A - Drilling method for wall of vertical shaft and sealed device using therefor - Google Patents

Abstract

PURPOSE:To form a starting opening for an excavator on the wall of a vertical shaft with formation of no dead water area or no cut-off wall around the vertical shaft by using a sealed device composed of a basic body regulating an internal space possible to pass through a shield type tunnel excavator to one direction. CONSTITUTION:A sealed device 10 is attached to a hole wall 14 with bolts 32, together therewith supported to a bed 84 at a time of boring. Next thereto, an excavator 16 is inserted into an internal space 20 at the top end part, the outer peripheral surface thereof is contacted with a seal plate 44 on the inner peripheral part, and airtightness is maintained between the excavator 16 and a ring plate 26. Then, a worker enters into the internal space 20 via an internal space 50 or the excavator 16 and forms a hole 28 on the hole wall 14. It is possible, thereby, to save work for cut-off of water around a vertical shaft and to reduce cost.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of drilling a hole in a shaft wall for receiving a shield type tunnel boring machine, and a sealing device used therefor.

(Prior art) In an excavation method for constructing a tunnel or laying a pipeline using a shield type tunnel excavator, before starting the excavator from the starting shaft, the starting port for receiving the excavator is placed in the opening of the starting shaft. Formed on the wall. At this time, if there is groundwater around the shaft or there is soft ground around the shaft, a hole is drilled in the shaft wall, and groundwater or earth and sand around the shaft will flow into the shaft from the hole, Mechanical equipment installed inside the shaft may become unusable.

As a method to prevent groundwater or soil from flowing into the shaft from the hole when forming the starting port, a ground improvement agent is injected into the ground around the shaft to create a waterstop around the shaft. Two methods have been proposed and implemented: one method is to form an ice wall around the shaft, and the other is to form a regular ice wall around the shaft by driving sheet piles around the shaft.

(Problem to be solved by the invention) However, in both methods, the work of forming a water stop zone or ice wall around the shaft is complicated, so it takes a long time to perform water stop construction. and require large amounts of drugs or materials;
As a result, it becomes expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for drilling into a shaft wall, which does not require construction to stop water around the shaft, and a sealing device used therefor.

(Means for solving problems, functions and effects of the invention) The present invention,
A method of drilling a hole in the wall of a shaft for receiving a shield type tunnel excavator is to install a sealing device that defines an internal space that allows the excavator to pass in one direction. one end of the sealing device is fixed to the shaft wall in a direction transverse to the shaft wall, and the front end of the excavator is inserted into the internal space from the other end of the sealing device,
The method includes drilling an NRT hole in the mine wall from within the interior space while sealing a space between the sealing device and the excavator so as to isolate the interior space from the outside.

The sealing device of the present invention used for boring a hole in the wall of a shaft for receiving a shield type tunnel excavator is a main body that defines an internal space through which the excavator passes in one direction. 1. A seal having an opening for receiving the excavator, the seal having an opening for receiving the excavator, and a seal having an opening for receiving the excavator; 11 so as to act as a seal between the excavator and the main body so as not to interrupt the
1. A seal disposed at the other end of the main body.

Launching to the mine wall [1] During the formation, the internal space of the main body is cut off from the outside of the main body. Therefore, when groundwater or sand starts to flow into the internal space of the main body from the hole during drilling, it is possible to prevent the inflow of groundwater or sand by maintaining the internal space of the main body at high pressure while performing the drilling work. can.

Therefore, according to the present invention, it is possible to form a water stop on the shaft wall without forming a waterstop or a waterstop wall around the shaft.

The sealing device of the present invention used for boring a hole in the wall of a shaft for receiving a shield type tunnel excavator includes a first body defining a first interior space through which the excavator passes in one direction. a first body fixed to the pit wall at one end so that the direction in which the excavator is allowed to pass is a direction across the pit wall; and a second interior space through which one worker can pass. a second body attached to the first body so that the second interior space communicates with the first interior space; and an opening "1" for receiving the excavator. A seal is provided at the other end of the first body to seal between the excavator and the first body in order to isolate the first internal space from the outside. a seal disposed in the first and second inner spaces; and a first partition wall for separating the first and second internal spaces from each other;
A first partition wall having a first hole that allows the internal space of g2 to communicate with each other, and a second partition wall that blocks off the internal space of @description 2 and the outside, which connects the second internal space and the outside. a second partition having second holes that communicate with each other; a first door that releasably closes the first hole; and a second door that releasably closes the second hole; including.

Thereby, when drilling, the operator can move from the outside to the first interior space via the second interior space or vice versa.

The sealing device is an auxiliary seal having an opening for receiving the excavator, and is configured to communicate between the first and second internal spaces so as to divide the first internal space into a front area and a rear area. The device may further include an auxiliary seal located anterior to the site.

A sealing device includes a first flow path that allows air to move between the first interior space and the exterior, and a first flow path that allows air to move between the first and second interior spaces. Second
a third flow path that allows air to move between said first and second interior spaces; and a third flow path that allows air to move between said second interior spaces and the exterior. a fourth flow path that allows air to move between the second interior space and an exterior; a fifth flow path that releasably closes the first flow path; a first valve operable outside the interior space of the valve and releasably closing the second flow path.

a second valve operable within the second interior space; a third valve operable within the first interior space to releasably close the third flow path; and a fourth valve operable within the first interior space. a fourth valve operable within the second internal space that releasably closes the flow path; and a fourth valve operable within the second internal space that releasably closes the fifth flow path. It is preferable to further include a fifth valve operable with. Thereby, the operator can enter and leave the first internal space 8 times while maintaining the first internal space at a high pressure.

(Example) The sealing device 10 shown in FIGS. 1 and 2 is placed in a shaft 12 in order to form a starting opening 18 for a shield type tunnel excavator 16 in a shaft wall 14 of the shaft 12.

The sealing device 10 includes a cylindrical first body 22 defining an interior space 20 through which an excavator 16 passes in one direction. At the front end and the rear end of the first main body 22, respectively,
Ring plates 24 and 26 are hermetically fixed by welding or the like so as to extend from the first body 22 toward the center thereof.

A cylindrical attachment body 28 for attaching the first body 22 to the mine wall 14 is airtightly fixed to the link plate 24 by welding or the like so as to coaxially extend forward from the first body 22. . The mounting body 28 is attached to the shaft wall 14 by a plurality of bolts 32 at a flange portion 30 provided at the tip thereof.
can be attached to. The interior space 34 defined by the mounting body 28 has a size that allows the excavator 16 to pass therethrough.

Seals 36 and 38 are attached to the rear end surfaces of ring plates 24 and 26, respectively, by a plurality of bolts 40 and 42. Each seal 36,38 includes an annular sealing plate 44 made of an elastically deformable material such as rubber and an annular backing plate 46 located behind the sealing plate.

The seal plate 44 has an inner diameter smaller than the outer dimension of the excavator 16.

As shown in FIG. 1, each backing plate 46 has an annular portion 46a that presses the sealing plate 44 against the corresponding ring plate 24.26, and a circular portion 46a that presses the sealing plate 44 against the corresponding ring plate 24.26. It includes a plurality of protruding pieces 46b that protrude. Each protruding piece 46
b are sequentially provided along the inner circumference H of the annular portion 46a.

The diameter of the circle defined by the line connecting the tips of the protruding pieces 46b is slightly larger than the inner diameter of the seal plate 44. The cover plate 46 is made of a plastically deformable metal plate such as a steel plate.

The sealing device 10 also includes a cylindrical second body 48 for access to and from the interior space 20 during one operation. second body 4
8, the internal space 50 of the second main body communicates with the internal space 20 of the first main body 22, the axis of the second main body 48 intersects the axis of the first main body 22, and First body 22 such that body 48 extends laterally from first body 22 .
It is airtightly attached by welding, etc.

As shown in FIG. 3, the second body 48 has an internal space 2.
A partition wall 52 that partitions 0.50 mm, and a partition wall 54 that partitions the internal space 50 and the outside, that is, the space inside the shaft 12, are attached. The partition walls 52 and 54 have, respectively,
The openings 56 and 58 are formed in the partition wall 5, respectively.
Doors 60 and 62 hinged to openings 56 and 54 are openable (closed at El). Doors 60 and 62 are provided with locking mechanisms that releasably maintain openings 56 and 58 closed, respectively. Equipped with.

The sealing device 10 further includes a vibro 4 that communicates the internal space 20 with the outside, and an internal space 20.5 of the main body 22.48.
0 to each other, and two pipes 70.7 to communicate the interior space 50 and the outside to each other.
2.

Vibros 4, 66, 68, 70 and 72 are fitted with valves 74, 76, 78, 80 and 82, respectively. The valve 74.82 is located external to the body 22.48 so that it can be operated externally to the body 22.48. The valves 76,80 are arranged in the interior space 50 such that they can be operated within the interior space 50. Valve 78 is disposed in interior space 20 such that it can be operated therein.

When drilling a hole, first, the sealing device 10 is attached to the shaft wall 14 by bolts 32 at the flange portion 30 of the mounting body 28, and is supported by a stand 84 as shown in FIG.

Next, the tip of the excavator 16, as shown in FIG.
It is inserted into the internal space 20. As a result, as shown by the dotted line in FIG. Department excavator 1
By contacting the outer peripheral surface of the ring plate 6, airtightness is maintained between the excavator 16 and the ring plate 26. Thereafter, a worker enters the interior space 20 via the interior space 50 or the excavator 16 and forms the hole 28 in the mine wall 14.

During the formation of the hole 28, a small hole is formed in the shaft wall 14, and when groundwater or soil begins to flow into the internal space 34 from the hole, the doors 60, 62 are first closed, and then the internal space 20 is closed. To stop the inflow of groundwater or earth and sand into the interior space 20, the pressure inside the interior space 20 is increased to a predetermined level, and in this state, the work of drilling the hole 18 is restarted.

Air for raising the internal space 20 to a predetermined pressure can be supplied using the vibro 4 or the excavator 16.

While the internal space 20 is maintained at a predetermined pressure, a force that causes the seal plate 44 to bend back is applied to the seal plate 44.

However, the folding back of the seal plate 44 due to this force is prevented by the protruding piece 46b of the backing plate 46.

Debris from the pit wall 14 is removed during or after the drilling operation using the second body 48 or using the dirt ejection mechanism of the excavator 16.

However, an earth and sand discharge mechanism may be attached to the first main body 22 or the attachment body 28, and the earth and sand may be discharged using this earth and sand discharge mechanism. During the drilling operation, a worker can access the interior space 20 using the second body 48 or the excavator 16.

When the drilling operation is completed, the excavator 16 is moved forward and the excavator 16 performs the excavation operation. During excavation operations, a predetermined pressure may be maintained within the interior space 20 to stop the flow of ground water or sediment into the interior space 20. However, since the seal 36 is arranged in the sealing device IO, it is possible to prevent groundwater or sediment from flowing into the internal space 20 without maintaining the internal space 1120 at a predetermined pressure. .

The sealing device 10 is spread out after a predetermined distance of excavation is completed or after the outer periphery of the lining is filled with backfill material placed on the excavation site by the excavator 16.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the sealing device of the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. FIG. 3 is a cross-sectional view taken along line -3. 10: Sealing device, 12 2g pit, 14: Pit wall, 16: Shield type tunnel boring machine, 18: Starting [1, 20, 34, 50: Internal space, 22: First body, 36.38: Seal , 48: second body, 52.54: partition, 56.58: hole, 60.62. Door, 74.76.7B, 70,72: Pipe, 74.76.
7B, 80.82 valve. Figure 2 Agent Patent Attorney Nobuyuki Matsunaga

Claims (5)

[Claims] (1) A method of drilling a hole in the wall of a shaft to receive a shield type tunnel excavator, the sealing device defining an internal space that allows the excavator to pass in one direction. One end of the sealing device is fixed to the mine wall so that the direction is transverse to the mine wall, and the front end of the excavator is inserted into the internal space from the other end of the sealing device, and A method for drilling a hole in a shaft wall of a shaft, the method comprising drilling the hole in the shaft wall from within the internal space while sealing between the sealing device and the excavator so as to isolate the space from the outside. (2) A sealing device used for boring a hole in the wall of a shaft for receiving a shield type tunnel excavator, the main body defining an internal space through which the excavator passes in one direction; A seal having a main body fixed to the pit wall at one end so that the direction in which the excavator is allowed to pass is a direction across the pit wall, and an opening for receiving the excavator, which connects the internal space of the main body to the outside. a seal disposed at the other end of the body to act as a seal between the excavator and the body to isolate the excavator. (3) A sealing device used for boring a hole in a shaft wall for receiving a shield type tunnel excavator, the first sealing device defining a first interior space through which the excavator passes in one direction. a first main body fixed to the pit wall at one end so that the direction in which the excavator is allowed to pass is a direction across the pit wall; and a second interior space through which an operator can pass. a second body defining a second body attached to the first body so that the second interior space communicates with the first interior space; and an opening for receiving the excavator. a seal disposed at the other end of the first body so as to act as a seal between the excavator and the first body to isolate the first internal space from the outside; a first partition wall that isolates the first and second internal spaces from each other and has a first hole that allows the first and second internal spaces to communicate with each other; a second partition wall that isolates a second internal space from the outside and has a second hole that allows the second internal space and the outside to communicate with each other; A sealing device including a first door that releasably closes the second hole and a second door that releasably closes the second hole. (4) An auxiliary seal having an opening for receiving the excavator, the seal being forward of a portion where the first and second internal spaces communicate so as to divide the first internal space into a front area and a rear area. 4. A sealing device according to claim 3, further comprising an auxiliary seal located at. (5) a first flow path that allows air to move between the first interior space and the outside;
a second flow path that allows air to move between the interior spaces of the first and second interior spaces; a third flow path that allows air to move between the first and second interior spaces; a fourth flow path that allows air to move between the second internal space and the outside; a fifth flow path that allows air to move between the second internal space and the outside; a first valve operable outside the first interior space to releasably close one flow path; and within the second interior space to releasably close the second flow path. an operable second valve; and the third operable valve.
a third valve operable within the first interior space to releasably close the flow path; and a third valve operable within the second interior space to releasably close the fourth flow path. and a fifth valve operable outside the second interior space to releasably close the fifth flow path. Device.