JPH1025989A - Water-stop method of arrival opening - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for executing a water stop between the shaft wall of an arrival shaft and a shield machine penetrated to the shaft wall. SOLUTION: The front section of a shield machine 14 having a cutter head 22 on a front is penetrated through the shaft wall 16 of an arrival shaft 12 and reaches the inside of the shaft 12, and a sealed space 36 receiving the front section of the shield machine 14 is specified and a covering means 28 surrounding the periphery of an opening 18, into which the shield machine is penetrated, is installed to the shaft wall 16. The sealed space 36 is filled with the solidified substance 40 having cutoff properties, of a coagulant. The covering means 28 may also be mounted before reaching into the arrival shaft 12 of the shield machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shield excavator having a cutter head on a front surface thereof, after reaching the inside of the shaft through a shaft of a reaching shaft, and then from a space between the shield machine and the wall of the reaching shaft. The present invention relates to a method for stopping water at an arrival port for preventing inflow of groundwater.

[0002]

2. Description of the Related Art A shield machine is propelled underground from a starting shaft to an reaching shaft to form a tunnel. The shield excavator may be provided through an opening provided in advance on a wall of the reaching shaft, or via an opening formed by excavation of the wall by a cutter head provided in front of the shield excavating machine, and Reach within.

[0003] Conventionally, after the shield machine reaches the arrival shaft, the ground wall and the sand from the gap between the shield machine and the shaft wall stop flowing into the arrival shaft. A rubber packing having a hole that allows the shield machine to penetrate, and when the shield machine penetrates the hole, the periphery of the hole is bent forward in the propulsion direction of the shield machine. A packing closely attached to the peripheral surface of the shield machine is attached, and the gap is filled with mortar or concrete.

However, in practice, a gap is formed between the peripheral surface of the shield machine and the periphery of the hole of the packing in contact with the shield machine, and the gap flows with the groundwater in the gap. Since sand and gravel stay, groundwater flows between the pit wall and the shield machine during the placement of the mortar or concrete, and it is difficult to hold the mortar or concrete between them. Yes, or water passages were formed in the solidified mortar or concrete, making it difficult to achieve effective water stoppage.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for providing water shutoff between a shaft of an arrival shaft and a shield machine that penetrates the shaft.

[0006]

According to the present invention, the shield excavator having the cutter head having a cutter head on the front surface penetrates the pit wall of the reaching shaft and reaches the inside thereof. A cover is defined on the pit wall defining a closed space for receiving the front part and surrounding the opening through which the shield machine penetrates, and then the solidified material in the closed space has a watertight property. Fill with coagulant. The covering means may be installed before the shield machine reaches the arrival shaft. Also, after the mortar or concrete has solidified, the covering means can be removed and the cutter head of the shield machine can be removed. The opening through which the shield machine penetrates may be either one formed beforehand in the tunnel wall or one formed by excavating the tunnel wall with a cutter head of the shield machine.

[0007]

According to the present invention, according to the present invention, the inside of the reaching shaft is covered by the covering means for covering the front part of the shield machine and the periphery of the opening which has reached the reaching shaft through the wall of the shaft. The inflow of groundwater and earth and sand into the arrival shaft is completely stopped by defining an enclosed space in the arrival shaft, and the solidified material is filled in the enclosed space while maintaining this state, whereby the downhole wall and the shield excavator are filled. Can be filled with the solidified material. Therefore, it is possible to form a shield for blocking groundwater, which is made of a solidified product of the solidified material having water stoppage in this gap, and
Effective water stoppage is realized.

[0008] After that, the operations of removing the covering means and removing the cutter head of the shield machine can be sequentially performed so that the inside of the reaching shaft and the body of the shield machine can be communicated. According to the present invention, the water stop state is maintained during and after these operations.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG.
A shield excavator (shield-type tunnel excavator) 14 is propelled underground from a starting shaft (not shown) to a reaching shaft (hereinafter, referred to as a “shaft”) 12 in order to form the shaft.

The shaft wall 16 of the shaft 12 is made of a sheet pile, reinforced concrete, or the like. The shaft wall 16 is provided with a circular opening 18 (FIG. 2) for receiving the shield machine 14. However, part of the tunnel wall 16 is the shield machine 1
4, the opening 18 is formed by the cutter head 22 of the shield machine 14 excavating a part of the pit wall.

The shield machine 14 includes a shield body 20.
And a cutter head 22 disposed on the front surface of the shield body and rotatably supported by the shield body 20 about its axis. In the illustrated example, the shield body 20
A plurality of segment rings 24 formed by assembling a plurality of segments into a ring shape are serially connected to the rear part.
The shield machine 14 is propelled by the extension operation of a plurality of shield jacks (not shown) incorporated therein, and is propelled by causing the segment ring 24 to exert a reaction force. During the propulsion, the ground 26 is cut by the cutter head 22. Excavated.

As shown in FIG. 2, after the cutter head 22 of the shield machine 14 reaches the inside of the shaft through the opening 18 of the shaft, a covering means 28 (FIG. 3) is attached to the inner surface of the shaft wall 16. The covering means 28 is attached directly to the pit wall 16,
Alternatively, it can be attached to a bracket 30 previously fixed to the pit wall 16.

The illustrated cover means 28 comprises a bowl-shaped main body 32 made of a steel material, a plastic material or the like, and an annular flange portion 34 connected to the periphery of the main body 32.
The bracket 30 also comprises a steel ring surrounding the shaft opening 18, more specifically around the periphery of the opening 18. The bracket 30 can be placed before the formation of the opening 18 (see FIG. 1). The open end of the body 32 of the covering means has a diameter greater than the diameter of the cutter head 22 of the shield machine and the flange 34 has the same inner and outer diameter as the annular bracket 30. Covering means 2
8 is not limited to a circular or disk shape as long as it can cover the front part of the shield machine 14 and the opening 18.
For example, it may be rectangular.

Therefore, when the inner surface of the main body 32 of the covering means 28 is directed toward the cutter head 22 of the shield machine 14 and the flange portion 34 is fixed to the bracket 30 using, for example, a plurality of bolts 35, the shield shaft 12 A front portion of the excavator 14, in the illustrated example, the cutter head 22 and a part of the shield main body are received, and a closed space 36 that continues to the opening 18 of the shaft is formed. Also, the covering means 28
The groundwater and the earth and sand flowing into the shaft 12 through the gap 38 between the pit wall 16 and the shield machine 14 are blocked by the installation.

If a portion of the pit wall 16 is made of the above-described cuttable material, a covering means 28 is attached to the pit wall 16 of the shaft before the shield machine 14 reaches the shaft 12. be able to. The covering means 28 is fixed around the place where the opening 18 is to be formed by the shield machine 14. Also in this case, the bracket 30 for fixing the covering means 28 can be fixed in advance around the portion where the opening is to be formed. According to this, the cutter head 30 of the shield machine 14 excavates a part of the pit wall to form an opening 18 which communicates with the interior of the shaft 12 and the front of the shield machine 14 12, the front of the shield machine 14 is received in an enclosed space 36 defined by the covering means 28.

Next, the solidified material 40 is filled in the closed space 36 (FIG. 4). The solidified material 40 has a property that the solidified material (solidified material) is impermeable to water, that is, has a water stopping property. Examples of the solidified material 40 include mortar, concrete,
There are plastic materials and the like. The coagulated material 40 is pre-mounted on the bracket 30 and communicates with the closed space 36 in the conduit 4.
2 and can be injected into the enclosed space 36.

The solidified material 40 injected into the closed space 36 is
The groundwater is removed from the closed space 36, and the opening 18 connected to the closed space, that is, the gap 38 is filled. Thus, after solidification of solidified material 40, gap 38 is occupied by solidified material 44 of solidified material 40 (FIG. 5), which solidified material
Blocks the flow of groundwater inward. Thereby, effective water stoppage is performed between the shield machine 14 and the pit wall 16.

Thereafter, the covering means 28, which is a temporary object, is removed and removed from the shaft 12. Furthermore, covering means 2
8, a part of the solidified material 44 such as mortar that covers the cutter head 22 of the shield excavator, which is exposed, is scraped off.
From the shaft and removed outside the shaft 12 (FIG. 6). Thereby, the inside of the shaft 12 and the tunnel space defined by the shield body 20 and the plurality of segment rings 24 communicate with each other.

Even after the removal or removal of the covering means 28, the part of the solidified material 44 and the cutter head 22, the gap 18 between the downhole wall 16 and the shield body 20 is occupied by the solidified material 44 such as mortar. I have. Therefore, shaft 1
No groundwater or sediment flows into the 2.

After removal or removal of the covering means 28, the portion of solidified material 44 and the cutter head 22, a structure is constructed utilizing the shaft 12, or another shield machine wherein the shaft 12 is a starting shaft. Tunnel excavation is performed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a shield machine is being propelled underground toward a reaching shaft.

FIG. 2 is a longitudinal sectional view showing a state in which a shield machine has reached a reaching shaft.

FIG. 3 is a longitudinal sectional view showing a state in which a covering means is attached to a pit wall in an arrival shaft.

FIG. 4 is a longitudinal sectional view showing a state in which a solidified material is filled in a closed space defined by a covering means.

FIG. 5 is a longitudinal sectional view showing a state in which a cover is removed to expose a solidified material of a solidified material.

FIG. 6 is a longitudinal sectional view showing a state after a part of a solidified material of a solidified material is removed and a cutter head of the shield machine is removed.

[Explanation of symbols]

 12, 16 Arrival shaft and its tunnel wall 14 Shield machine 18 Opening 22 Cutter head 28 Covering means 30 Bracket 36 Sealed space 38 Gap between shaft wall and shield machine 40, 44 Solidified material and solidified material thereof

Claims (5)

[Claims] And a closed space for receiving the front of the shield machine after the front of the shield machine having a cutter head in front thereof penetrates the inner wall of the reaching shaft and reaches the inside thereof. Attaching a covering means surrounding the opening through which the shield machine penetrates to the downhole wall, and filling the enclosed space with a solidified material which is a solidified material and a solidified material of which has a water stopping property. Water stop method. 2. The shield excavator having a cutter head in front thereof, when the shield excavator reaches the arrival shaft, before the front portion of the shield excavator penetrates the wall of the arrival shaft and reaches the inside thereof. Attaching a cover to the pit wall defining an enclosed space for receiving the front of the shield machine and surrounding an opening through which the shield machine penetrates, after the shield machine reaches the reaching shaft, A method for stopping water at an arrival port, comprising filling a closed space with a solidified material which is a solidified material and whose solidified material has a water stopping property. 3. The method of stopping water, further comprising removing the covering means after solidification of the solidified material, and further removing a cutter head of the shield machine. 4. The water stopping method according to claim 1, wherein an opening through which the shield machine penetrates is formed in advance in the wellhead wall. 5. The water stopping method according to claim 1, wherein the opening through which the shield machine penetrates is formed by excavating the wellhead wall with a cutter head of the shield machine.