JP2003307093A - Electric-corrosion utilizing deterioration method for shield-propulsion work obstruction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method, in which an underground obstruction interrupting a shield propulsion path and/or a barrier for an underground building is deteriorated, using the front of a shield machine as an external electrode without using special materials, in underground-tunnel excavation propulsion works by a shield tunneling method. <P>SOLUTION: In the method in which the underground obstruction interrupting the shield propulsion path and/or the barrier 3 for the underground building is deteriorated, an electrolytic solution-filled section 8 is formed between the barrier 3 and the front of the shield machine 4, and a voltage is applied, using a steel core material constituting the barrier 3 as an anode and a shield-front device 4a as a cathode. In the method, the steel core material is corroded electrically and weakened, and the barrier 3 interrupting the shield propulsion path 6a is deteriorated to strength and a structure which the barrier can be excavated and broken by the shield machine 4. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of deteriorating a barrier of an underground obstacle and / or a structure of an underground structure that blocks a shield excavation path by electrolytic corrosion in an underground tunnel excavation propulsion work by a shield method. Regarding

[0002]

2. Description of the Related Art Conventionally, when underground excavation is carried out by the shield construction method or the propulsion construction method, if there is an underground obstacle that obstructs the route, a temporary establishment pit is constructed around the obstacle and it is removed manually. Alternatively, the method of forming a face from the ground or inside the shield machine around the obstacle to form a face and removing it manually is used.

However, there is a problem that the shield propulsion process must be interrupted by any method. Also,
There were safety problems associated with manual labor and cost problems associated with labor.

To solve this problem, the inventor of the present invention has proposed a method of breaking down and penetrating underground obstacles and starting arrival shafts by electrolytic corrosion (Japanese Patent Laid-Open No. 2001-90473). However, it was necessary to previously provide an electrode structure for electrolytic corrosion and a portion filled with an electrolyte solution inside the structural material of the electrolytic corrosion portion. Therefore, there are problems that special materials must be prepared in advance and that costs are high. In addition, there was a problem that it could not be applied to underground obstacles buried in general construction.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and in the underground tunnel excavation propulsion work by the shield method, the underground obstacle and / or the underground which obstruct the shield excavation route. An object of the present invention is to provide a method of deteriorating the front surface of the shield machine as an external electrode without using a special material for the barrier of the structure.

[0006]

In order to solve the above-mentioned problems, the method for deteriorating the use of electrolytic corrosion of a shield excavation work obstacle of the present invention is an underground method of shielding a shield excavation route in an underground tunnel excavation propulsion work by the shield construction method. A method of degrading a barrier of an obstacle and / or an underground structure, comprising forming an electrolyte solution filling part between the barrier and a front surface of a shield machine,
Injecting an electrolyte solution, using the steel core material that constitutes the barrier as an anode, and applying a voltage with the shield machine front device as a cathode, the steel core material is electrolytically corroded by anodic dissolution to make it brittle, and the shield excavation path It is characterized by degrading the blocking barrier to a strength and structure that can be excavated and destroyed by a shield machine.

According to the present invention, the front surface of the shield machine can be deteriorated as an external electrode without using a special material as the barrier for the underground obstacle and / or the underground structure that blocks the shield excavation route. Therefore, as compared with the removal of obstacles from the ground and the removal of the shield machine front face, the shield excavation can be safely performed in a short period of time without cost.

Further, the electrolyte solution filling portion improves the surrounding ground from the inside of the shield machine when the shield machine reaches the ground just before the barrier of the underground obstacle and / or the underground structure blocking the shield tunnel. The electrolyte solution is formed so as to be filled with the electrolyte solution, and the barrier surface is cleaned so that the barrier surface comes into contact with the electrolyte solution.

According to the present invention, the formation of the electrolyte solution filling portion for electrolytic corrosion can be performed in the ground. For this reason, it is not affected by the environment of the above-ground portion, and when the ground is a road, there is no occurrence of obstacles due to some traffic interruptions. In addition, the surrounding ground improvement method from the inside of the shield machine is to make holes radially from the shield machine body wall to the ground, and inject high-pressure ground improvement material from the holes,
From the front part of the shield machine to the underground obstacle, a cylindrical water blocking layer zone is used as the electrolyte solution filling part. Further, the surface of the underground obstacle in the electrolyte solution filling portion is washed from the front of the shield machine by the obstacle washing device 15 equipped with the high-pressure jetting means.

The shield machine front device is a cutter disk body of the shield machine.

According to the present invention, the electrode for electrolytic corrosion of the underground obstacle is the cutter disk of the shield machine. Therefore, no additional electrode material is required, and the cost and steps for installing the electrode can be reduced.

Further, the front surface device of the shield machine is an electrode which is composed of a conductive disk and a reinforcing material which are provided in advance at an entrance of a starting shaft of the shield machine and which is insulated from the shield machine. .

According to the present invention, it is possible to construct a starting shaft in advance and dispose the electrode in the entrance portion of the shield machine starting. Therefore, mirror cutting can be started by electrolytic corrosion at the same time as the installation of the shield machine.

The electrolyte solution filling section is provided with an electrolyte solution injection pipe, a drainage recovery pipe for collecting the electrolyte solution, and an exhaust pipe, and collects the electrolyte solution and hydroxides and gases generated by electrolytic corrosion. -Characterized by exhausting.

According to the present invention, an electrolytic solution that promotes electrolytic corrosion of structural materials and reinforcing materials for underground obstacles and / or underground structures is supplied, and waste liquid such as iron hydroxide is discharged for recovery processing. be able to. Therefore, environmental pollution can be prevented.

Further, the barrier of the underground structure is constituted by a steel core material having a space where an electrolyte solution can be filled in a passage portion of the shield machine.

According to the present invention, the starting shaft is SMW.
Even for walls, RC walls, steel shell walls, and caisson walls, it is possible to efficiently perform electrolytic corrosion by providing an electrically conductive space in the H-shaped steel of the reinforcing material.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the method for deteriorating the use of electrolytic corrosion of a shield digging construction obstacle according to the present invention.
FIG. 3 is a diagram showing the relationship between a shield tunnel and underground obstacles in the traveling direction, and (b) shows the main parts of the shield machine and the underground obstacles when the underground obstacles are deteriorated by the method of the present invention. It is a schematic diagram.

FIG. 1A shows a state in which the shield machine 4 for excavating the underground 2 is blocked by the underground obstacle 3 along the route 6a to be excavated. In this figure, after the shield machine 4 has approached the underground obstacle 3, it is slightly retracted. A indicates a range in which the periphery of the tip of the shield machine 4 is improved to form an electrolyte solution filling portion.

FIG. 1 (b) shows the shield machine 4 and the main parts around the underground obstacle 3 when the underground obstacle 3 is deteriorated.

In the figure, a ground improvement part 7 contacts the underground obstacle 3 and improves the ground around the shield machine front device 4a to a geology in which no electrolyte solution leaks to form an electrolyte solution filling part 8. Shield machine 4 or shield excavation tunnel 6
An electrolyte solution supply / recovery device 11 and a DC power supply device 20 are provided inside.

The electrolyte solution 11b is sent from the electrolyte solution supply / recovery device 11 to the solution delivery port 16a by the pump 11a and is supplied to the electrolyte solution filling section 8. In addition, the electrolytic corrosion waste liquid of the underground obstacle is recovered from the recovery port 16b. Reference numeral 12 is a liquid supply pipe, and 13 is a drainage pipe. Reference numeral 14 is an exhaust pipe, and 14a is an exhaust valve thereof.

The anode side electric wire 20a connected to the positive electrode of the DC power supply device 20 is inserted into the drilled hole 7a formed in the ground improvement section 7 and connected to the underground obstacle 3. Further, a voltage is applied by connecting the cathode side electric wire 20b connected to the negative electrode of the DC power supply device 20 to the shield machine front device 4a. The main body of the cutter disk of the shield machine 4 to which a voltage is applied serves as a cathode, the steel core material of the underground obstacle 3 serves as an anode, and an electrolytic corrosion phenomenon, that is, anodic dissolution occurs via the electrolyte solution, and the steel core material deteriorates.

In this figure, the shield machine front device 4a is a cutter disk body mounted on the shield machine. 1
Reference numeral 5 is an obstacle cleaning device. Although only one anode side electric wire 20a connected to the underground obstacle 3 is shown in the figure, it is desirable to connect a plurality of electric wires. In addition, depending on the condition of the underground obstacle 3 or the condition of the shield machine, the anode side electric wire 2 may be changed from the ground.
If 0a can be connected to the underground obstacle 3, it may be connected from the ground.

FIG. 2 is a diagram for explaining the steps of the method for deteriorating the use of electrolytic corrosion of an obstacle for shield machine excavation work according to the present invention.

In the shield propulsion step, the shield machine 4 is excavated toward the underground obstacle 3, and each time the excavation is performed, the shield excavation tunnel 6 is formed in the segment 5. Where 1
Indicates the ground and 2 indicates the ground.

[0028] shows an electrolyte solution filling portion forming step. The shield machine 4 that has been dug up to just before contacting the underground obstacle 3 is slightly retracted, and a hole 7a is drilled from the inside of the shield machine 4 toward the outer periphery to remove the ground improvement material 7b from the ground improvement material supply device 10. It is injected at a high pressure and the surrounding ground in front of the seed machine is used as a geological ground improvement section 7 in which no electrolyte solution leaks. In this process, a cylindrical electrolyte filling portion 8 is formed between the front surface of the shield machine 4 and the underground obstacle 3. Also, an obstacle cleaning device 15 (see FIG. 1) equipped with a high-pressure injection means from the front of the shield machine.
The surface of the underground obstacle 3 in the electrolyte solution filling portion 8 is washed by.

Next, in the electrolyte solution filling step, the electrolyte solution supply / recovery device 11 is installed inside the shield machine 4 or shield excavation tunnel 6 and the electrolyte solution 11b is pumped 11
At a, it is supplied to the electrolyte solution filling section 8 from the liquid supply port 16a.
At this time, the excavated mud contained in the electrolyte solution filling section 8 is discharged from the recovery port 16b and replaced with the electrolyte solution 11b.

Next, in the electrolytic corrosion step, the DC power supply device 20 is installed inside the shield machine 4 or the shield tunneling tunnel 6, the anode side electric wire 20a is inserted into the drilled hole 7a, and is connected to the underground obstacle 3. Next, the cathode side electric wire 20b is connected to the shield machine front device 4a to apply a voltage. Anode side electric wire 2
The insertion of 0a and the connection to the underground obstacle 3 are performed by inserting a coated PE pipe having a bit at the tip into the drilled hole 7a.
This can be surely performed by connecting the tip so as to bite into it (not shown).

When the cutter disk body of the shield machine 4 to which a voltage is applied serves as a cathode, the steel core material of the underground obstacle 3 serves as an anode, causing an electrolytic corrosion phenomenon through the electrolyte solution 11b, and the steel core material deteriorates. To do. In this electrolytic corrosion step, the electrolytic solution 11b is supplied from the liquid feed port 16a to the electrolytic solution filling portion 8 by the pump 11a, and the electrolytic corrosion waste liquid of the underground obstacle 3 is recovered from the recovery port 16b.

Next, in the underground obstacle destruction and advancing step, the deteriorated underground obstacle 3a is destroyed and penetrated by the cutter disk of the shield machine to proceed.

In the passing step, the segment 5 penetrating the underground obstacle 3 is assembled to complete the shield tunneling tunnel 6.

As described above, the method for deteriorating the use of electrolytic erosion for shield excavation work according to the present invention does not require the use of a special material as a barrier for the underground obstacle and / or the underground structure that blocks the shield excavation route. The front surface of the shield machine can be deteriorated as an external electrode.

Next, an embodiment in which the underground obstacle is a starting shaft of a shield machine will be described. 3 to 5
FIG. 3 is an embodiment in which the present invention is applied to a starting shaft constructed with a steel retaining wall of earth retaining wall, FIG. 3 is a cross-sectional view in plan view, and FIG. 4 is a side view including arrangement of ground equipment. Cross section,
FIG. 5 is a cross-sectional view of the starting shaft entrance viewed from the front.

The starting shaft 30 shown in FIG. 3 is a vertical shaft formed by steel sheet pile earth retaining walls 31 on four sides and supported by supporters 32. The starting shaft where the shield machine 4 is assembled is connected to the starting shaft concrete 33. An entrance section is formed. The gap between the wellhead concrete 33 and the shield machine 4 is sealed with an entrance packing 33a.

A cathode portion 34 is provided on the front surface of the shield machine 4, and a filler 35 for retaining earth pressure is filled between it and the cutter disk. The cathode part 34 has an electrode terminal 34a for applying a voltage to the periphery thereof. An electrolyte solution filling portion 8 for filling the electrolyte solution 11b is formed between the steel sheet pile earth retaining wall 31 and the cathode portion.

A reaction force support 32a for starting the vehicle is provided behind the shield machine 4, and is provided via a reaction wall 32b and a jack (not shown).

FIG. 4 is a cross-sectional side view of an embodiment in which the present invention is applied to a starting shaft constructed with a steel retaining wall 31 for retaining earth, including a layout of ground facilities. Description of the same reference numerals as those in FIG. 3 is omitted.

An electrolyte solution supply / recovery device 11 is provided on the ground of the starting shaft 30, and an electrolyte solution 11b is supplied and filled in the electrolyte solution filling portion 8 by a liquid supply pipe 12. Further, a waste liquid pipe 13 is connected below the electrolyte solution filling portion 8 to collect the electrolytic corrosion waste liquid by the circulation pump 11a.

Further, the DC power supply device 20 is provided on the ground of the starting shaft 30, and the steel sheet pile earth retaining wall 31 has the anode side electric wire 20.
Connect a. Also, the electrode terminal 34a of the cathode part 34
The cathode side electric wire 20b is connected to and a voltage is applied.

The cathode portion 34 and the steel sheet pile earth retaining wall 31 to which a voltage is applied cause electrolytic corrosion phenomenon through the electrolyte solution 11b, and the portion of the steel sheet pile earth retaining wall 31 facing the cathode portion 34 is dissolved and deteriorated.

FIG. 5 is a sectional view of the starting hole of FIG. 4 as viewed from the front. In the wellhead concrete 33 provided inside the steel sheet pile earth retaining wall 31, an entrance portion where the shield machine 4 starts is circularly opened, and the cathode portion 34 facing the steel sheet pile earth retaining wall 31 with the electrolyte solution filling portion 8 sandwiched therebetween. Is provided.

Inside the wellhead concrete 33, the cathode part 3
4, an electrode terminal 34a connected to 4, a liquid feed pipe 12 to the electrolyte solution filling portion 8, and a drain pipe 13 are embedded. In addition, an exhaust pipe 14 for collecting gas generated by electrolytic corrosion and an aeration port 12a for blowing compressed air for stirring the electrolyte solution 11b are provided.

Next, an embodiment of the starting shaft 60 using the soil cement earth retaining wall using the H-shaped steel as a reinforcing material shown in FIG. 6 will be described.

The soil cement earth retaining wall 60 shown in FIG. 6 (a) uses H-shaped steel 62 as a pile core material, and its periphery is filled with soil mortar 61. In this embodiment, the H-type steel 62a for electrolytic corrosion is used as the core material of the electrolytic corrosion portion, which has a space in which the electrolyte solution can be filled.

FIG. 6B is a sectional view of the H-shaped steel 62a for electrolytic corrosion. The H-shaped steel for electrolytic corrosion 62a has a structure in which a steel plate 62c is welded to the upper and lower openings of H of a normal H-shaped steel to make the inside a space.

In the embodiment of the starting shaft described with reference to FIGS. 3 to 6, the cathode portion 34 is provided in the entrance portion, but the cutter disk body of the shield machine may be used as the cathode portion. It goes without saying from the technical idea of the present invention. When the shield machine body is used as the cathode, the starting shaft 30 and the shield machine body may be installed in an insulated state. That is, the shield machine 4 is mounted on the starting stand 30a shown in FIG. 4 via an insulating material.

[0049]

EFFECTS OF THE INVENTION The method for deteriorating the use of electrolytic erosion for shield excavation work according to the present invention has the following effects.

The front surface of the shield machine can be deteriorated as an external electrode without using a special material as a barrier for the underground obstacle and / or the underground structure that blocks the shield excavation route. Therefore, as compared with the removal of obstacles from the ground and the removal of the shield machine front face, the shield excavation can be safely performed in a short period of time without cost.

Further, according to the present invention, the formation of the electrolyte solution filling portion for electrolytic corrosion can be performed in the underground. For this reason, it is not affected by the environment of the above-ground portion, and when the ground is a road, there is no occurrence of obstacles due to some traffic interruptions.

Further, since the cutter disk of the shield machine is used as the cathode electrode for electrolytic corrosion of underground obstacles, no additional electrode material is required, and the cost and process of electrode installation can be reduced.

Further, it is possible to construct a starting shaft in advance and dispose the cathode electrode at the entrance of the shield machine starting. Therefore, mirror cutting can be started by electrolytic corrosion at the same time as the installation of the shield machine.

Furthermore, it is possible to supply an electrolyte solution that promotes electrolytic corrosion of structural materials and reinforcing materials for underground obstacles and / or underground structures, and to discharge waste liquid such as iron hydroxide for recovery processing. . Therefore, environmental pollution can be prevented.

Furthermore, the starting shaft and the like are attached to the SMW wall, R
Even if it is a C wall, a steel shell wall, or a caisson wall,
It is possible to efficiently perform electrolytic corrosion by providing a space in the shape steel that can be energized.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an embodiment of a method for deteriorating the use of electrolytic corrosion of a shield excavation work obstacle of the present invention, in which (a) is a diagram showing a relationship between a shield excavation tunnel and an underground obstacle in a traveling direction;
(B) is a schematic diagram which shows the shield machine and the principal part of an underground obstacle when deteriorating an underground obstacle by the method of this invention.

FIG. 2 is a diagram for explaining the steps of the method for deteriorating the use of electrolytic corrosion of an obstacle for excavating a shield machine according to the present invention.

FIG. 3 is a cross-sectional plan view of an embodiment in which the present invention is applied to a starting shaft that is built with a retaining wall of steel sheet pile.

FIG. 4 is a cross-sectional side view including an arrangement of ground facilities, of an embodiment in which the present invention is applied to a starting shaft constructed with a retaining wall of steel sheet pile.

5 is a cross-sectional view of the starting hole of FIG. 4 as viewed from the front.

6A is a diagram showing an embodiment of a starting shaft 60 using a soil cement earth retaining wall using H-type steel as a reinforcing material, and FIG. 6B is a sectional view of H-type steel for electrolytic corrosion.

[Explanation of symbols]

1 above ground 2 underground (underground) 3 underground obstacles or underground structures 3a Deteriorated underground obstacles 4 shield machine 4a Shield machine front device (cutter disk) 5 segments 6 shield promotion tunnel 6a Expedition 7 Ground Improvement Department 7a Drilling 7b Ground improvement material 8 Electrolyte solution filling section 11 Electrolyte solution supply and recovery device 11a Circulation pump 11b Electrolyte solution 12 Liquid transfer pipe 12a Aeration port 13 Drainage pipe 14 Exhaust pipe 14a Exhaust valve 15 Obstacle cleaning device 16a Liquid delivery port 16b Recovery port 20 DC power supply 20a Anode side electric wire 20b cathode side electric wire 30 start shaft 31 Steel sheet pile earth retaining wall 32 Support work 32a Reaction force support work 32b Reaction wall 33 Wellhead concrete 33a entrance packing 34 Cathode part 34a Electrode terminal 35 Earth pressure retention filler 60 soil cement retaining wall 61 soil mortar 62 H type steel 62a H-type steel for electrolytic corrosion 62c steel plate

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yasuhiro Arakawa             2 Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction Co., Ltd.             Inside the company (72) Inventor Education             1-12-12 Minami-Kamata, Ota-ku, Tokyo Japan             Corrosion Protection Co., Ltd. (72) Inventor Hideki Ueda             1-12-12 Minami-Kamata, Ota-ku, Tokyo Japan             Corrosion Protection Co., Ltd. F-term (reference) 2D054 AC01 BA07 EA07                 2E176 AA01 DD53

Claims (6)

[Claims] 1. A method of deteriorating a barrier of an underground obstacle and / or an underground structure that blocks a shield excavation path in an underground tunnel excavation propulsion work by the shield construction method,
An electrolyte solution filling portion is formed between the barrier and the front surface of the shield machine, an electrolyte solution is injected, a steel core material forming the barrier is used as an anode, and a voltage is applied using a shield machine front device as a cathode, Electrolytic corrosion of steel core material by anodic dissolution to make it brittle, and the barrier that blocks the shield excavation path is deteriorated to a strength and structure that can be excavated and broken by a shield machine. . 2. The electrolyte solution filling section improves the surrounding ground from the inside of the shield machine when the shield machine arrives just before the barrier of the underground obstacle and / or the underground structure blocking the shield tunnel. The electrolyte solution is formed so that it can be filled with an electrolyte solution, and the barrier surface is cleaned so that the barrier surface comes into contact with the electrolyte solution. Method. 3. The method for deteriorating use of electrolytic corrosion of a shield excavation work obstacle according to claim 1, wherein the shield machine front device is a cutter disk body of the shield machine. 4. The shield machine front device is an electrode which is composed of a conductive disk and a reinforcing material which are provided in advance in an entrance portion of a starting shaft of the shield machine, and which is insulated from the shield machine. The method for deteriorating use of electrolytic corrosion of an obstacle for shield excavation work according to claim 1. 5. The electrolyte solution filling section includes an electrolyte solution injection pipe, a drainage recovery pipe for collecting the electrolyte solution, and an exhaust pipe, and collects the electrolyte solution and hydroxides and gases generated by electrolytic corrosion. The method for deteriorating the use of electrolytic corrosion of an obstacle for shield excavation work according to claim 1, characterized by exhausting. 6. The shield excavation work according to claim 1, wherein the barrier of the underground structure is made of a steel core material having a space capable of being filled with an electrolyte solution in a passage portion of the shield machine. Deterioration method of using electrolytic corrosion of obstacles.