JP2016205110A - Recovery method of shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recovering driving means of a shield machine to a departure shaft side, by making the shield machine buried by a propulsion method reach a side surface part of an assembly segment main pipe buried in the ground.SOLUTION: The present invention is a recovery method of a shield machine by which propulsion construction is stopped in a position of not applying large pressing force to a side surface part of an existing assembly segment main pipe on the tip of a cutter face plate by a thrust point jack equipped in the shield machine, and a lock unit capable of sealing the propulsion pipe inside and an external part by an opening-closing door is connected to the rearmost end surface of a propulsion pipe in a departure shaft, and working face ground is stabilized by applying predetermined pneumatic pressure to the propulsion pipe inside and the shield machine inside by pneumatic equipment provided in the vicinity, and while removing the cutter face plate by entering into a partition wall from an inspection door provided in the partition wall center, and a clearance between an outer shell on the shield machine tip and an existing assembly segment main pipe outer shell is fixedly connected by a divided protective plate manufactured so as to fit a diameter of a shield machine outer shell, and afterwards, driving means is removed to the departure shaft side by separating the partition wall and the driving means.SELECTED DRAWING: Figure 1

Description

  The present invention is to work from the inside of an existing assembly segment main body on the side surface of an assembly synthetic segment main pipe or a steel segment main pipe (hereinafter referred to as an assembly segment main pipe) buried in the ground by a shield method. Rather, the excavator embedded by the propulsion method is made to reach a substantially right angle, and the steel material of the assembly segment main shell and the steel material of the excavator shell are integrated and rigidly connected. It is related with the method of collect | recovering to the start shaft side through the inside of a propulsion pipe.

  In the plan to connect branch pipes etc. to the assembly segment main pipe buried in the ground by the shield method afterwards, the assembly segment main pipe is often already in use. As a general rule, reinforcement work to meet the demand cannot be performed. For this reason, a method is generally used in which the auxiliary ground method is improved by injecting chemical solution or the like in the section between the side surface of the main assembly segment and the tip of the excavator tip. However, in the above-mentioned conventional auxiliary method, a chemical solution is injected into an invisible portion of the basement to expect a certain water-stopping effect. However, if the ground properties in the ground are complicated, it can be reliably stopped. There is a problem that water is difficult.

  For this reason, the side part of the assembly segment main pipe is made by using a plurality of cutting bits on the cutter face plate at the tip of the excavator as a special bit that can cut the steel and concrete body of the outer shell that is the main assembly segment pipe. A method of cutting and connecting through has been proposed.

  The special bit of the prior art makes it possible for the excavator to cut through the side part of the main assembly segment even when the ground improvement by injection of chemicals around the reaching part cannot be ensured and water stoppage cannot be expected. Became.

The cutter face plate of the excavator of this technology has made it possible to connect the assembly segment main pipe and the propulsion pipe following the excavator. However, when the excavator moves forward while cutting the side surface of the assembly segment main, the water stoppage due to chemical injection is greatly impaired by the vibration of the excavator, and earth and sand flows out from the outer periphery of the excavator into the assembly segment main along with the groundwater. There was a problem to do. In this state, the excavator that has penetrated the assembly segment main and the assembly segment main can be joined only by filling with water-stopping material or mortar. However, there is a problem that groundwater or the like erupts due to separation or breakage of the joint.
JP 2010-255344 A

  For this reason, the problem to be solved by the present invention is to provide a method for recovering an excavator that can safely and efficiently recover the combination of the existing assembly segment main pipe and the propulsion pipe and the recovery of the excavator. .

In the present invention, a cutter face plate having a plurality of bits is provided in front of the outer shell from the start shaft side, a partition is provided inside the outer shell behind the cutter face plate to partition the outside, and the cutter face plate is rotated on the back of the partition. The excavator was fixed by inserting the drive means in the outer shell, and then the cutter face plate was rotated to start the excavator and excavate the tunnel hole in the ground, and the propulsion pipe was embedded in the tunnel hole Then, it reaches the side surface of the existing assembly segment main pipe laid in the ground, joins the side shell of the assembly segment main pipe and the outer shell of the excavator, and then the cutter face plate of the excavator through the propulsion pipe And the drive means of the cutter faceplate to the start shaft side,
The thrust point jack equipped on the excavator stops the propulsion work at the position where the tip of the cutter face plate does not apply a large pressing force to the side surface of the existing assembly segment main pipe, and the propulsion pipe is placed at the end face of the propulsion pipe in the starting shaft. A lock unit that can be sealed with an open / close door is connected to the outside, and a predetermined pressure and pressure is applied to the inside of the propulsion pipe and the excavator by the nearby pneumatic equipment to stabilize the face ground, and from the inspection door provided in the center of the bulkhead While entering the bulkhead and removing the cutter faceplate, the gap between the outer shell at the tip of the excavator and the main shell of the existing assembly segment main pipe is fixed with a split protective plate that is manufactured to fit the diameter of the outer shell of the excavator. This is a method for recovering an excavator in which the partition wall and the driving means are detached and then the driving means is removed to the start shaft side.

  The assembly segment main is limited to assembly synthetic segments and steel segment mains in which the outer shell is covered with steel so that the steel of the excavator outer shell and the divided protective plate made of steel can be rigidly connected. .

  The excavator is provided with a cutter face plate in front of the outer shell, a partition is provided inside the outer shell behind the cutter face plate to partition it from the outside, and a driving means for rotating the cutter face plate is fitted in the outer shell on the back of the partition wall. It has a fixed structure. The excavator is a peripheral drive means for securing an inspection door in the center of the partition wall, and is composed of a plurality of universal joints, speed reducers, electric motors and the like so as to be inscribed in the excavator. A plurality of direction control jacks are arranged in the circumferential direction at the joint portion at the tip of the first succeeding cylinder behind the partition wall. In addition to the direction correcting jack, a plurality of thrust point jacks that can measure the pressing force applied to the cutter face plate at the tip of the excavator are provided in the circumferential direction at the joint portion at the rear end of the first trailing cylinder. Yes.

  The lock unit is configured such that flanges matching the diameter of the end face of the propulsion pipe are provided at both ends of a cylindrical body having a predetermined length in the propulsion direction, and is in close contact with the end face of the propulsion pipe. A partition wall is provided in the cylinder before and after the cylindrical body, and an opening / closing door is installed in the front and rear partition walls so that a person can go in and out. The lock unit is made of steel or the like so that it can withstand air pressure.

  As for the pneumatic equipment, it is necessary to secure the compressed air suitable for the working water pressure and the amount of air supplied into the excavator and the propulsion pipe, and a compressor or the like is selected in advance. The installation location of the pneumatic equipment is efficient if it can be installed in the start shaft near the lock unit, but there is less piping material, but if there is no installation space, it will be installed on the ground near the start shaft.

  For the split protection plate that joins the outer shell at the tip of the excavator and the existing outer shell of the assembly segment, the number of divisions is considered in consideration of safety and workability according to the propulsion pipe diameter, joining conditions, and soil conditions. Adjust. The cutting of the cutter face plate is also divided and cut so as not to interfere with the installation of the divided protective plate. As the material, steel is used so that the excavator outer shell and the assembly segment main shell can be rigidly connected.

  When the rigid protection by the divided protective plate is completed, the divided and cut cutter face plate pieces and crushed assembly segment main pipe pieces are carried out through the propelling pipe, and then the fixing with the partition wall is released and the drive unit is started up. The excavator is recovered. At this time, efficient transportation can be performed if a moving means including wheels or the like is previously provided below the driving means.

  When the removal of the equipment in the excavator and the propulsion pipe is completed, the inner mold is assembled inside the outer shell of the excavator, and the outer shell and the inner mold are filled with concrete and resin material. Collection promotion construction is completed.

  The excavator recovery method of the present invention integrates the outer shell of the existing assembly segment main pipe with the outer shell of the excavator rigidly and integrally without any work from within the main assembly segment pipe. The drive means can also be efficiently recovered from the start shaft side. Furthermore, by integrating the assembly segment main and the excavator shell, it was possible to cope with the horizontal force in the horizontal direction during an earthquake, and the structure was excellent in earthquake resistance.

    The excavator is made to reach the side of the assembly segment main pipe buried in the ground at a substantially right angle by a propulsion method, and the steel material of the assembly segment main shell and the steel of the excavator shell are integrated, A method for recovering the drive mechanism of the excavator through the propulsion pipe to the start shaft side has been realized.

  FIG. 1 is a longitudinal sectional view for explaining the state of arrival by the excavator recovery method of the present invention. The assembly segment main pipe 12 which is an object of the present invention is such that the outer shell of the assembly segment main pipe 12 is covered with a steel material. Now, in the plan to connect branch pipes such as sewers to the assembly segment main pipe 12 and join them, the assembly segment main pipe 12 has already been used, and the reinforcement work to welcome the excavator from the assembly segment main pipe 12 In principle, the cutting work of joints cannot be performed. For this reason, a cutter face plate 3 having a plurality of bits is provided in front of the outer shell 4 in a start shaft provided in a substantially perpendicular direction on the side surface of the assembly segment main pipe 12, and the cutter face plate 3 is driven to rotate behind the partition wall 6. An excavation machine 1 configured by fitting and fixing the means 2 in the outer shell 4 is installed. A plurality of directional control jacks 7 are arranged at symmetrical positions in the circumferential direction at the joint portion at the tip of the first succeeding cylinder 5 behind the partition wall 6 provided on the back surface of the cutter face plate 3, and the propulsion accuracy of the excavator 1 Maintain and manage In addition to the direction control jack 7, a plurality of thrust point jacks 8 are arranged on the joint at the rear end of the first succeeding cylinder 5 in order to measure the pressing force applied to the cutter face plate 3 at the tip of the excavator 1. Equipped in the direction. Then, while rotating the cutter face plate 3 of the excavator 1 to start the excavator 1 into the ground and excavating the tunnel hole, the propulsion pipe 9 is embedded in the tunnel hole.

  When the excavator 1 approaches the existing assembly segment main pipe 12, careful propulsion is performed while monitoring the pressing force applied to the thrust point jack 8. When the pressing force of the cutter face plate 3 reaches the allowable value applied to the side surface portion of the existing assembly segment main pipe 12, the propulsion work is stopped. After the propulsion is stopped, an auxiliary method such as chemical injection is applied to the side of the assembly segment main pipe 12 and the reach of the tip of the excavator 1 to improve the surrounding ground.

FIG. 2 is a longitudinal cross-sectional view for explaining the installation situation of the divided protective plates by the excavator recovery method of the present invention. When the ground improvement by the chemical injection is completed, the lock unit 10 in which the inside and outside of the propulsion pipe 9 can be sealed by the front and rear doors 11 is connected to the rearmost end face of the propulsion pipe 9 in the start shaft 14, and the compression equipment ( By applying a predetermined pressure and pressure in the propulsion pipe 9 and the excavator 1 to stabilize the face ground, the face enters the bulkhead through the inspection door provided in the center of the bulkhead 6 and the water stoppage state of the face and the like is stopped. Check.
When the water stop confirmation of the face portion is completed, the upper cutter face plate 3 is cut, and the gap between the outer shell 4 at the tip of the upper excavator 1 and the outer shell at the side surface of the assembly segment main pipe 12 is removed from the outer excavator 1. It is fixed by welding with a divided protective plate 13 manufactured according to the diameter. Next, the left and right cutter face plates 3 are cut, and the gap between the outer shell 4 at the tip of the left and right excavator 1 and the outer shell of the side surface of the assembly segment main pipe 12 is welded and fixed by the divided protective plate 13. . Finally, the lower cutter face plate 3 is cut, and the gap between the outer shell 4 at the tip of the lower excavator 1 and the outer shell at the side of the assembly segment main pipe 12 is welded and fixed by the divided protective plate 13. At the same time, the divided protective plate 13 is integrated by welding also in the vertical and horizontal directions of the divided protective plate 13. In the present embodiment, the division method is disclosed as four divisions, upper, lower, left and right. However, the number of divisions may be increased / decreased depending on the propulsion pipe diameter, soil condition, etc., and the divided protective plate 13 may be installed efficiently.

  When the rigid connection between the outer shell of the excavator 1 and the outer shell of the assembly segment 13 by the divided protective plate 13 is completed, the pressurized air from the pneumatic equipment is cut off, and the lock unit 10 connected to the start shaft 14 is removed. The Thereafter, cutting and sharpening of the outer shell portion and the concrete body portion of the assembly segment main pipe 12 surrounded by the divided protective plate 13 having the same diameter as the outer shell of the excavator 1 are performed from within the excavator 1. When the cutting and sharpening of the assembly segment main pipe 12 is completed, the partition wall 6 and the driving means 2 are separated.

  FIG. 3 is a longitudinal sectional view for explaining a pulling state of the driving means by the excavator recovery method of the present invention. When the fixed installation of the partition wall 6 and the drive means 2 is released, the drive means 2 is pulled out to the start shaft 14 side by a traction device or the like (not shown) provided in the start shaft 14. At this time, if a moving means composed of wheels or the like is previously provided below the driving means, efficient drawing can be performed.

    When the collection of the drive means 2 is completed, a plurality of rib members are welded and reinforced evenly in the circumferential direction on the divided protective plate 13 and the inner surface of the outer shell 4. Then, an internal mold is assembled on the inner periphery of the divided protective plate 13 and the outer shell 4, and the collection protective construction is completed by filling the divided protective plate 13, the outer shell 4 and the inner mold with concrete or a resin material. .

  As described above, the excavator recovering method of the present invention can provide a safe and reliable recovering method even when the reinforcement work and the take-in work for receiving the excavator from the assembly segment main pipe cannot be performed at all.

It is a longitudinal cross-sectional view explaining the reach | attainment state by the collection method of the excavation machine of this invention. It is a longitudinal cross-sectional view explaining the division | segmentation protection board installation condition by the collection method of the excavation machine of this invention. It is a longitudinal cross-sectional view explaining the extraction condition of the drive means by the excavator recovery method of the present invention.

DESCRIPTION OF SYMBOLS 1 Excavator 2 Drive means 3 Cutter-face plate 4 Outer shell 5 1st succeeding cylinder 6 Bulkhead 7 Directional control jack 8 Thrust point jack 9 Propulsion pipe 10 Lock unit 11 Opening and closing door 12 Existing assembly segment main pipe 13 Split protective plate 14 Start Shaft

Claims (1)

A cutter face plate with a plurality of bits is provided in front of the outer shell from the starting shaft side, a partition is provided inside the outer shell behind the cutter face plate, and is partitioned from the outside, and driving means for rotating the cutter face plate on the back of the partition is removed. The excavator fitted in the shell was fixed, and then the cutter face plate was rotated to start the excavator and excavate the tunnel hole in the ground, while pushing the propelling pipe into the tunnel hole, And reach the side surface of the existing assembly segment main pipe laid to join the outer shell of the assembly segment main pipe and the outer shell of the excavator, and then the cutter face plate and cutter of the excavator through the propulsion pipe. A method of recovering the drive means of the face plate to the start shaft side,
The thrust point jack equipped on the excavator stops the propulsion work at the position where the tip of the cutter face plate does not apply a large pressing force to the side surface of the existing assembly segment main pipe, and the propulsion pipe is placed at the end face of the propulsion pipe in the starting shaft. A lock unit that can be sealed with an open / close door is connected to the outside, and a predetermined pressure and pressure is applied to the inside of the propulsion pipe and the excavator by the nearby pneumatic equipment to stabilize the face ground, and from the inspection door provided in the center of the bulkhead While entering the bulkhead and removing the cutter faceplate, the gap between the outer shell at the tip of the excavator and the main shell of the existing assembly segment main pipe is fixed with a split protective plate that is manufactured to fit the diameter of the outer shell of the excavator. A method for recovering an excavator, comprising connecting and connecting, and then separating the partition wall and the driving means to remove the driving means to the start shaft side.

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