JPH0765462B2 - Obstacle cutting method and cutting device by water jet in shield method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and an apparatus for cutting an obstacle such as a drain material appearing on a cutting face by ultra-high pressure jet water in a short time in a closed cider construction method. Is.

[Conventional technology]

When an obstacle such as a drain material made of a synthetic fiber bundle appears on the face in the closed cider construction method, it is necessary to cut and remove the obstacle.

Conventionally, as a method of cutting the obstacle, (1) after improving and stabilizing the cutting face ground by injecting a chemical solution or the like, the worker enters between the partition wall and the cutting face of the shield machine and picks or gas. Method of cutting obstacles such as drain material using a cutter, (2) Hooking obstacles such as drain material in the pit of the rotary cutter in the shield machine,
A method of tearing off the obstacle and cutting it is known.

[Problems to be Solved by the Invention]

In the case of the cutting method of the above (1), the propulsion of the shield machine has to be stopped while the worker enters the space between the partition wall and the face of the shield machine to perform cutting work. And the space between the partition wall and the face is narrow, so not only is workability poor, but the working environment is also very bad due to gas etc. generated during cutting, and further the propulsion of the shield machine is stopped for a long time. Then, Mt. Kiriwachi may collapse.

Further, in the case of the cutting method of (2) above, a large number of obstacles such as a drain material are usually buried at a pitch of 1 m and the tensile strength of one obstacle has a large tensile strength of about 400 kgf. When tearing off obstacles such as lumber one by one, the obstacles are stretched 10 times or more like rubber before being torn off, which may cause sinking of the ground above the shield machine with obstacles such as drain material. .

It is an object of the present invention to provide a method and an apparatus for easily cutting an obstacle such as a drain material appearing on a face of a face with super-high pressure jet water in a short time in a closed shield method.

[Means for Solving the Problems]

In order to achieve the above object, in the obstacle cutting method using the water jet in the shield construction method of the present invention, the rotary cutter disk 2 in the shield machine 1 is used.
An arcuate slit 4 having a center common to that of the rotary cutter disk 2 is provided on the peripheral side of the face plate 3 of the rotary drive device 5 for turning.
An annular turning member 6 that is turned concentrically with the rotary cutter disk 2 is provided in the shield machine body 7 at the rear of the rotary cutter disk 2, and has a radius of rotation substantially the same as the arcuate slit 4 of the rotary cutter disk 2. The ultra-high-pressure jet water jet nozzle 8 rotated by the above is attached to the annular turning member 6, and when the rotating cutter disk 2 reaches a position where it contacts or approaches the obstacle 9, the annular turning member 6
Also, the super-high-pressure water jet nozzle 8 is swirled, and the obstacle 9 is cut by the super-high-pressure jet jetted from the nozzle 8.

Further, in the obstacle cutting device by the water jet in the shield construction method of the present invention, the shield machine 1
In the peripheral side of the face plate 3 of the rotary cutter disk 2 in the above, an arcuate slit 4 having a common center with the rotary cutter disk 2 is provided, and an annular swivel is swiveled concentrically with the rotary cutter disk 2 by a swiveling drive device 5. The member 6 has a shield machine body 7 at the rear of the rotary cutter disk 2.
An ultra-high pressure jet water injection nozzle 8 is rotatably fitted in the front part of the rotary cutter disk 2 and is rotated with an almost same radius of rotation as the arcuate slit 4 of the rotary cutter disk 2. It is mounted so that it can move back and forth.

[Work]

Rotating cutter disk 2 in sealed shield machine 1
Reaches a position where it contacts or approaches the obstacle 9,
The turning drive device 5 is operated to turn the annular turning member 6 supporting the ultra-high pressure jet water injection nozzle 8, and the ultra-high pressure jet water injection nozzle 8 directs the ultra-high pressure jet water toward the face. When jetted, the obstacle 9 is cut by the ultra-high pressure jet water.

〔Example〕

 The present invention will now be described in detail with reference to the illustrated example.

The screen shows an obstacle cutting device by a water jet in the shield construction method according to an embodiment of the present invention, in which a circular cutter disk body 10 has a large number of openings for discharging excavated material extending in the radial direction of the cutter disk body. Part 11
Is provided radially, the bit support member 12 extending along the center portion in the width direction of the opening 11 is fixed, and a large number of cutter bits 13 are fixed on both sides of the bit support member 12 in the width direction. A rotary cutter disk 2 is constituted by the cutter disk body 10, the bit support member 12, and the cutter bit 13, and a plurality of circles having a common center with the rotary cutter disk 2 on the peripheral side of the face plate 3 of the rotary cutter disk 2. Arc-shaped slits 4 are provided at intervals in the circumferential direction of the rotary cutter disk, and the rotary cutter disk 2 is arranged in the front part of the cylindrical shield machine body 7, and a partition wall 14 is provided on the front end side in the shield machine body 7. Are fixed by welding.

A support ring 15 is concentrically arranged at the rear part of the rotary cutter disk 2, and the front part of the support ring 15 and the rear part of the rotary cutter disk 2 are arranged at intervals in the support ring circumferential direction. A ring 17 is fixed through a plurality of connecting members 16, a disk 17 is fixed inside the support ring 15, an annular driven gear 18 is fixed at the rear of the support ring 15, and a support ring with an annular driven gear 18 is attached. The body 15 is supported by the partition wall 14 via a bearing 19, and a seal material 55 is interposed between the outer peripheral surface of the support ring body 15 and the partition wall 14 and is fixed to the central portion of the rotary cutter disk 2. The central shaft 20 is inserted through the disk 17 and the partition wall 14.

A large number of cutter disk rotation drive devices 21 composed of hydraulic motors are fixed around the rear portion of the partition wall 14, and a drive pinion 22 fixed to the rotation shaft of the drive device 21 is meshed with the annular driven gear 18. The driving device 21 causes the rotating cutter disk 2 to rotate normally or reversely at a speed of 1 to 3 RPM.

An annular turning member 6 is arranged in the shield machine body 7 in front of the partition wall 14, and the annular turning member 6 is supported by the shield machine body 7 and an annular bearing member 23 fixed to the front part of the partition wall 24. Rotatably supported via 25 and bearing 24
A seal member 26 is interposed between the annular swivel member 6 and the shield machine main body 7 in front of the bearing, and a seal member 27 is interposed between the rear surface of the annular swivel member 6 and the front surface of the partition wall 14 inside the bearing 24. Further, a seal member 28 is interposed between the annular swiveling member 6 and the annular supporting member 23 at the front part of the bearing 25, and a seal is provided between the annular swiveling member 6 and the annular supporting member 23 inside the bearing 25. Material 29 is interposed.

An annular driven gear 30 having internal teeth is fixed to the inside of the annular swiveling member 6, and the swiveling drive device 5 is composed of a hydraulic motor.
Is fixed to the partition wall 14, and the drive pinion 31 fixed to the rotating shaft of the turning drive unit 5 is meshed with the annular driven gear 30, and the turning drive unit 5 drives the annular turning member 6 to rotate.
Is rotated concentrically with the rotary cutter disk 2, and the rotation speed of the nozzle rod 36 is set to about 0.6 to 1.0 m / min.

A plurality of arcuate openings 32 facing the arcuate slits 4 are provided in the partition wall 14 at intervals in the partition wall circumferential direction, and a nozzle rod guide tube 33 extending in the front-rear direction is provided in the arcuate opening portion 32. It is inserted and fixed to the annular swivel member 6, and a support fitting 34 is fixed to the rear end portion of the nozzle rod guide tube 33, and the support fitting 34 is for closing the nozzle rod guide tube 33 in communication. The nozzle rod 36, to which the valve 35 is attached, extends further in the front-rear direction and has a water passage hole, is slidably fitted into the nozzle rod guide tube 33 and the closing valve 35, and the hydraulic pressure for forward-backward movement is also provided. The cylinder in the cylinder 37 is pin-coupled to the support fitting 34, and the connecting fitting at the tip of the piston rod of the two-stage hydraulic cylinder 37 for forward / backward movement is different from the bracket fixed to the rear end of the nozzle rod 36. It is detachably connected by.

An ultra-high pressure jet water jet nozzle 8 is detachably attached to the front end portion of the nozzle rod 36, and the radius of gyration of the arc-shaped slit 4 at the center in the width direction and the radius of gyration of the jet hole of the nozzle 8 are the same or Set to be almost the same,
An ultra-high pressure water supply pump 39 and a fresh water tank 40 for supplying water to the pump 39 are mounted and fixed on a support base 38 fixed inside the shield machine main body 7, and the discharge port of the pump 39 is ultra-high. It is connected to the rear end of the nozzle rod 36 via a high-pressure hose 41, and is connected to the ultra-high-pressure jet water jet nozzle 8 at about 20
Ultra-high pressure jet water of 00-3000kgf / cm ² is jetted forward.

A muddy water chamber 42 is formed by the rotary cutter disk 2, the outer peripheral portion of the partition wall 14, the support ring 15 and the disk 17, and one end of a muddy water pipe 43 that opens into the muddy water chamber 42 is formed below the partition wall 14. Parts are connected, an opening / closing valve 44 is provided in the sludge discharge pipe 43, and an agitator 47 that is rotated by a drive device 46 on both sides of a suction port 45 of the sludge discharge pipe 43 is provided in the lower part of the muddy water chamber 42. The
A mud supply port 50 of a mud pipe 49 having an opening / closing valve 48 is opened on the upper side in the muddy water chamber 42.

An annular holding member 51 fixed inside the shield machine body 7
A large number of shield jacks 52 are pierced through, the front end of the shield jacks 52 is engaged with a bearing ring 53 fixed to the shield machine body 7, and the shield jacks
The rear end of 52 is engaged with the front surface of segment 54.

The opening 11 of the rotary cutter disk 2 is opened and closed by an opening / closing plate (not shown).

FIGS. 6 to 8 show an example of the closing valve 35, and a valve plate 59 is arranged in a valve box 58 having the insertion hole 56 and the rear insertion hole 57, and the valve plate 59 is Rear insertion hole
It is pivotally attached to the valve box 58 by a horizontal axis 60 arranged at the top of 57,
An O-ring 61 is fitted in an annular groove provided in the rear insertion hole 57. When the nozzle rod 36 is inserted into the valve box 58,
As shown in FIG. 6, the valve plate 59 is automatically opened, and when the nozzle rod 36 is pulled out from the valve box 58, the valve plate 59 is pulled by its own weight as shown in FIGS. 7 and 8. It is automatically rotated to the closed position, and therefore, when inspecting or replacing the nozzle, it is possible to prevent muddy water or the like from the face from jetting into the shield machine body 7 through the nozzle rod guide tube 33. .

When the tunnel is to be excavated by using the closed shield shield excavator 1 having the water jet obstacle cutting device configured as described above, the nozzle rod 36 is arranged at the retracted position as shown by the solid line in FIG. In this state, the cutter disc rotating drive device 21 rotates the cutter disc 2
Is rotated forward or backward, or is repeatedly rotated forward or backward, and the shield machine 1 is propelled while excavating the face ground by the rotating cutter disk 2.

As shown in FIG. 5, when the rotary cutter disk 2 comes into contact with or comes close to an obstacle 9 such as a synthetic fiber bundle drain material buried in the ground, first, the nozzle rod 36 is moved by the hydraulic cylinder 37 for forward and backward movement. Is moved forward to insert the front end portion of the nozzle rod 36 and the nozzle 8 for jetting ultra-high pressure jet water into the arcuate slit 4 of the rotary cutter disk 2, and then the swiveling drive device 5 is operated to operate the nozzle rod. 36
The circular swivel member 6 supporting the circular swivel member 6 is normally swung, reverse swung, or reciprocally swung forward and backward, and if necessary, the rotary cutter disk 2 is swung in the same direction as the circular swivel member 6 to supply ultra-high pressure water. The pump 39 is operated to inject the ultra-high pressure jet water from the ultra-high pressure jet water jet nozzle 8 toward the face, and the obstacle 9 is cut from the ultra-high pressure jet water.

When it becomes necessary to inspect or replace the ultra-high-pressure jet water jet nozzle 8, the nozzle rod 36 is moved backward by the hydraulic cylinder 37 for forward / backward movement, and then the bracket at the rear end of the nozzle rod 36 is removed. The connection with the hydraulic cylinder 37 for moving back and forth is released, and then the nozzle rod 36 is pulled backward, and at the same time, the closing valve 35 is closed. By doing so, the worker can safely inspect and replace the ultra-high pressure jet water jet nozzle 8 in the shield machine body 7 at the rear of the muddy water chamber 42 without the worker entering the muddy water chamber 42.

When this invention is carried out, the expansion / contraction of the hydraulic cylinder 37 for forward / backward movement and the operation stop of the drive device 5 for turning may be performed by remote control or automatic control. Further, a polymer material or an abrasive may be mixed in the water jetted at ultrahigh pressure. By jetting the ultra-high pressure water mixed with the abrasive in this way, even if the ultra-high pressure jet water jet nozzle 8 is relatively far from the obstacle 9 in muddy water (for example, about 20 cm), the obstacle 9 can be easily cut.

Furthermore, while the rotation of the rotary cutter disk 2 is temporarily stopped, the annular swivel member 6 supporting the nozzle rod 36 is swung forward or backward, or forward and backward repeatedly to cause an obstacle due to the super-high pressure jet water. The object 9 may be cut.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

The super-high-pressure jet water jetted from the super-high-pressure jet water jet nozzle 8 through the arc-shaped slit 4 of the rotary cutter disk 2 removes the obstacle 9 such as a synthetic fiber bundle drain material buried in the ground. Since the obstacle 9 can be cut easily and quickly and further without stopping the propulsion of the shield machine 1, the obstacle 9 can be cut without reducing the tunneling efficiency. Moreover, since the obstacle 9 is cut by the ultra-high pressure jet water, the obstacle 9 can be cut without adversely affecting the ground. Further, by mounting the ultra-high pressure jet water jet nozzle 8 on the annular swivel member 6 so as to be movable back and forth, the ultra-high pressure jet water jet nozzle 8 is brought closer to the optimal cutting position with respect to the obstacle 9, and the obstacle 9
Can be reliably cut.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a vertical sectional side view of a sealed shield machine having an obstacle cutting device, FIG. 2 is a front view thereof, and FIG. 3 is FIG. Fig. 4 is an enlarged vertical side view showing a part of Fig. 4, Fig. 4 is a front view showing the vicinity of the suction port and the agitator, and Fig. 5 is a vertical side view showing the cutting condition of an obstacle made of a drain material by ultra-high pressure jet water. Is. 6 is a vertical sectional side view showing a state where the closing valve is opened by the nozzle rod, FIG. 7 is a vertical sectional side view showing a state where the closing valve is closed, and FIG. 8 is A- in FIG. It is an A line sectional view. In the figure, 1 is a shield machine, 2 is a rotary cutter disk, 3 is a face plate, 4 is an arc-shaped slit, 5 is a drive device for turning, 6 is an annular turning member, 7 is a shield machine main body, and 8 is ultra-high pressure jet water. Nozzle for injection, 9 for obstacle, 13 for cutter bit, 14 for partition wall, 15 for support ring, 16 for connecting member, 18 for annular driven gear, 21 for cutter disk rotation drive device, 22
Is a drive pinion, 23 is an annular support member, 30 is an annular driven gear, 31 is a drive pinion, 32 is an arcuate opening, 34 is a support fitting, 35 is a closing valve, 36 is a nozzle rod, 37 is a liquid for forward and backward movement. A pressure cylinder, 39 is a pump for supplying ultra-high pressure water, 40 is a fresh water tank, 41 is an ultra-high pressure hose, 42 is a mud chamber, 47 is an agitator, 59 is a valve plate, and 60 is a horizontal axis.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Sugiyama 3-30-18 Osawa, Koshigaya City, Saitama Urban Estate B Building 102 (56) Bibliography Sho 61-188696 (JP, U)

Claims (2)

[Claims] 1. An arcuate slit 4 having a common center with the rotary cutter disk 2 is provided on the peripheral side of a face plate 3 of the rotary cutter disk 2 in a shield machine 1 and a rotary cutter disk 2 is provided by a turning drive device 5. An annular turning member 6 which is turned concentrically is provided inside the shield machine body 7 at the rear part of the rotary cutter disk 2 and is rotated at an almost same radius of rotation as the arcuate slit 4 of the rotary cutter disk 2. The jet water jet nozzle 8 is attached to the annular swivel member 6, and when the rotary cutter disk 2 reaches a position where the rotary cutter disk 2 comes into contact with or approaches the obstacle 9, the annular swivel member 6 and the ultra-high pressure water jet nozzle 8 are swung. At the same time, by the water jet in the shield construction method in which the obstacle 9 is cut by the ultra high pressure jet ejected from the nozzle 8. Harm material cutting method. 2. An arcuate slit 4 having a common center with the rotary cutter disk 2 is provided on the peripheral side of the face plate 3 of the rotary cutter disk 2 in the shield machine 1, and the rotary cutter disk 2 is driven by a turning drive device 5. An annular turning member 6 which is turned concentrically with the rotary cutter disk 2 is rotatably fitted to the front part inside the shield machine body 7 at the rear part of the rotary cutter disk 2, and the arcuate slit 4 of the rotary cutter disk 2 is provided.
The super-high-pressure jet water jet nozzle 8 which is rotated with the same radius of rotation as the above is attached to the annular swivel member 6 so as to be movable back and forth.