JPH0291395A - Elliptical shield drilling machine - Google Patents

Abstract

PURPOSE:To effectively use each cutter bit by fitting a slide cutter having an ordinary cutter bit to a rotary disc cutter, and moving the tip part of the slide cutter in an elliptical form using a cutter shifting hydraulic cylinder. CONSTITUTION:When a rotary cutter disc 3 is rotated, slide cutters 6 having cutter bits 2, cutter shifting hydraulic cylinders 7, a striker 10 and the like turn and the first proximity switches S1 and S2 are actuated with the striker 10. Also, the slide cutters 6 are caused to move due to the operation of the cutter shifting hydraulic cylinders 7. Furthermore, the tip part of each slide cutter 6 moves along the external surface of a shield drilling machine body 1. According to the aforesaid construction, it is possible to rotate the rotary cutter disc 3 with relatively low torque and carry out effective cutting work with each cutter bit 2 of the slider cutters 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to an elliptical shield excavator used for excavating tunnels with an elliptical cross section.

[Conventional technology]

Conventionally, as an oval shield excavator, (1) Unexamined Japanese Patent Publication No. 6
As disclosed in Japanese Patent No. 1-49098, an elliptical slide groove is provided on the front circumferential surface of a shielding machine body having an elliptical cross section, and a circular rotary cutter disk equipped with a large number of cutting blades is installed as described above. It is arranged in the front part of the shielding machine body and is configured to be rotated via a central axis by a drive device, and the base ends of a number of slide cutters are pivotally attached around the rotary cutter disk by pins, and each slide The engaging part provided at the tip of the cutter is fitted into the slide groove, and the rotating cutter disk rotates in one direction, causing the retaining part at the tip of the slide cutter to slide along the slide groove, and the slide cutter is rotated. (2) As disclosed in Japanese Unexamined Patent Publication No. 61-49099, an elliptical slide groove is provided on the front peripheral surface of the shield machine body having an oval cross section. , a circular rotary cutter disk having a plurality of digging blades is disposed at the front part of the shield machine body and configured to rotate via a central axis by a drive device, and around the rotary cutter disk, A large number of guide holes extending in the radial direction of the disk are provided, and a slide cutter is slidably inserted into each guide hole, and a pin attached to the tip of the slide cutter is inserted into the slide groove, and the rotary cutter disk is rotated. The rotation causes the pin at the tip of the slide cutter to move along the slide groove, and the engagement between the pin and the slide groove causes the slide force cover to slide in the radial direction of the disk, and the slide cutter is rotated. The elliptical shield tunneling machine configured, (3) the above-mentioned Japanese Patent Application Laid-Open No. 1986
As disclosed in Publication No. 1-49099, a circular rotary cutter disk equipped with a large number of digging blades is arranged at the front of a shield machine body with an oval cross section, and the rotary cutter disk is driven by a drive device. around the rotating cutter disk, configured to rotate through a central axis by a
A large number of guide holes extending in the radial direction of the disk are provided, a slide cutter is slidably inserted into each guide hole, and each slide cutter and rotating cutter disk are connected via hydraulic jacks for moving the cutter that extend in the radial direction of the disk. Connected oval shield tunneling machines are known.

[Problem to be solved by the invention]

In the case of the oval shield excavator described in (1) above, since the extension direction of the slide cutter changes with respect to the radius line of the rotating cutter disk, it is not possible to attach a normal cutter bit to the slide cutter body, and the conical It is necessary to attach a shaped bit to the cutting edge, but the disadvantage of a circular or conical shaped bit is that it has very poor cutting efficiency and is easily worn out.

Furthermore, since the rotation direction of the rotary cutter disk cannot be switched between forward and reverse rotation and rotates in one direction, it is impossible to correct rolling of the shielding machine body.

In addition, in the case of the oval shield excavators described in (1) and (2) above, the earth and sand enters the slide groove and is consolidated, so the sliding resistance of the retaining part at the tip of the slide cutter and the pin is reduced. This increases the torque of the rotary disk cutter and causes large bending forces to act on the slide cutter.

In the case of the oval shield excavators described in (2) and (3) above, only the cutter bit of the slide cutter that protrudes from the outer periphery of the rotating disc cutter performs cutting;
Since the canter bits of the slide cutter located inside the outer periphery of the rotary disk cutter do not perform cutting, each cutter bit of the slide cutter cannot be used effectively.

Furthermore, in the case of the elliptical shield excavator described in (3) above, since the means for controlling the expansion and contraction of the hydraulic jack for moving the cutter is not shown, it cannot be implemented unless the means for controlling the expansion and contraction is developed.

In this invention, a slide cutter having a normal cutter bit is attached to a rotating disc cutter, the rotating disc cutter can be rotated with a relatively small torque, and each cutter bit in the slide cutter can constantly perform cutting. Moreover, the hydraulic cylinder for moving the cutter can be precisely expanded and contracted by simple means so that the tip of the slide cutter moves in an elliptical shape along the front end of the shield machine body, which has an oval cross section. Another object of the present invention is to provide an oval shield excavator capable of excavating an oval tunnel while rotating a rotary cutter disk equipped with a slide cutter in the opposite direction to correct rolling when the shield machine body rolls. That is.

[Means to solve the problem]

In order to achieve the above object, in the oval shield excavator of the present invention, a rotary cutter disk 3 equipped with a large number of cutter bits 2 is disposed at the front of the shield machine main body l having an oval cross section, and its rotation On the outer circumferential side of the cutter disk 3, front opening guide grooves 4 extending in the disk radial direction are provided at intervals of 90'' in the circumferential direction of the disk, and a slide cutter 6 equipped with a large number of cutter bits 5 at the front portion is provided at the front side. The rotary cutter disk 3 and the slide cutter 6 are connected to each other by a hydraulic valve for moving the cutter extending in the longitudinal direction of the slide cutter.
A first proximity switch Sl operated by a striker 10 that rotates together with the rotary cutter disk 3 is directly or indirectly fixed near the major axis of the shielding machine main body 1, and near the short axis of the shielding machine main body 1, A second proximity switch S activated by the striker 10
2 are fixed directly or indirectly, and the extension pressurizing chambers 11 of the adjacent cutter moving hydraulic cylinders 7 are connected to the pipe lines 12, 1.
3, the first proximity switch Sl and the second proximity switch S2
The tip of the slide cutter 6, which is connected to a hydraulic pump 15 through an electromagnetic switching valve 14 and rotates together with the rotary cutter disk 3, moves in an elliptical shape along the circumference of the shielding machine body 1. Thus, when one adjacent hydraulic cylinder for moving the cutter is extended, the other hydraulic cylinder for moving the adjacent cutter is shortened.

[For production]

The striker 10, which is arranged in the same phase as the hydraulic cylinder for moving the cutter and rotates together with the rotary cutter disk 3,
When the first proximity switch Sl on the long axis line of the shield machine main body l is activated, the electromagnetic switching valve 14 is set to the long axis line hydraulic cylinder shortening position and the short axis line hydraulic cylinder extension position according to the signal of the first proximity switch S1. The striker 10 also causes the second striker on the short axis of the shield machine main body 1 to
When the proximity switch S2 is actuated, the signal from the second proximity switch S2 causes the electromagnetic switching valve 14 to be switched to the minor axis hydraulic cylinder extension/major axis hydraulic cylinder retraction position, and therefore the 90'' angle. The slide cutters 6 are moved by the cutter moving hydraulic cylinder 7 so that the distal ends of the slide cutters 6 adjacent to each other at intervals move in an elliptical shape along the circumference of the shield machine body 1.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows an embodiment of the invention, in which a bit support arm 17 and a shorter hollow arm 18 with a square cross section are arranged alternately at angular intervals of 45° around the central holding member 16. A guide member 19 is arranged and fixed in a radial manner, and a proximal end portion of a guide member 19 extending linearly with respect to the hollow arm 18 and having a front opening guide groove 4 is fixed to the distal end portion of the hollow arm 18. , each bit support arm 17, hollow arm 18 and guide member 19 are:
The bit support arm is connected via a plurality of connection members 2o spaced apart from each other in the longitudinal direction of the bit support arm, and is connected to both sides of the front part of the bit support arm 17 in the middle direction and to the front part of the central holding member 16. A rotary cutter disc 3 is constructed by attaching a cutter bit 2 to the rotary cutter disc 3.

The rotary cutter disk 3 configured in this way is arranged at the front of the cylindrical shield machine main body 1 with an oval cross section, and the annular support member 21 arranged at the rear of the rotary cutter disc 3 is attached to the shield machine main body 1. 1 and its supporting member 2
An annular driven gear 22 disposed inside the support member 2
The annular driven gear 22 is rotatably fitted into an annular groove provided in a partition wall 23 fixed to the inside of the partition wall 2.
The front end of the connecting ring 24 and the rear part of the rotary cutter disk 3 are connected to a plurality of blades arranged at intervals in the circumferential direction of the connecting ring. A central shaft 26 connected via a connecting member 25 and fixed to the center of the rotary cutter disk 3.
is rotatably fitted into the partition wall 23, and furthermore, a number of drive devices 27 for rotating cutter disks, each consisting of a hydraulic motor, are arranged around the inside of the support member 21, and the drive devices 27 are fixed to the partition wall 23. A pinion 28 fixed to the rotating shaft of the drive device 27 is meshed with the annular driven gear 22, and the rotary cutter disk 3 is rotated by the drive device 27.

Slide member 2 extending in the radial direction of the rotating cutter disk
Reference numeral 9 is slidably fitted into the front opening guide groove 4, and a number of cutter bits 5 are fixed on both sides in the width direction at the front part of the slide member 29, and the cutter bits 5 are fixed to the slide member 29 and the cutter fixed thereto. A slide cutter 6 is constituted by the bit 5, and a support member 30 fixed to the base end of the slide member 29 is slidably fitted to the hollow arm 18, and is further connected to the base end of the slide cutter 6. The central holding member 16 is connected to the cutter moving hydraulic cylinder 7 disposed within the hollow arm 18 .

A pair of strikers 10 are arranged on both sides of the rotary cutter 3 in the diametrical direction, and each striker 10 is connected to the partition wall 23.
Each striker 10 is arranged at the rear of the rotary cutter disk 3 and in the same phase as the hydraulic cylinder 7 for moving the cutter, that is, at a position overlapping the rear of the hydraulic cylinder 7.
It is fixed to a connecting ring 24 which rotates together with the connecting ring 24. At the rear of the bulkhead 23, a pair of first proximity switches S1 operated by the striker 10 are disposed on both sides of the major axis of the shield machine main body 1, and on both sides of the short axis of the shield machine main body 1, the first proximity switches S1 are arranged. Striker 1
A pair of second proximity switches S2, which are activated by the switch 0, are arranged, and each proximity switch 31, S2 is directly or indirectly fixed to the support member 21 or partition wall 23 fixed to the shield machine main body l.

The expansion pressurizing chambers 11 in the two adjacent cutter moving hydraulic cylinders 7 are connected to a conduit 12 having check valves 31 and 32.
, 13, and an electromagnetic switching valve 14 which is operated by a first proximity switch Sl and a second proximity switch S2 to a hydraulic pump 15.

The front end of the discharge tube 33, which is inclined diagonally downward from the rear to the front, is fixed to the periphery of the soil discharge opening 34 provided at the lower part of the support member 21, and the discharge tube 33 is
An earth removal screw 36 rotated by a screw rotation drive device 35 is accommodated therein, and a large number of shield jacks 37 arranged at the rear of the support member 21 are fixed to the shield machine main body 1. An erector 41 for installing the segments 40 is attached to a support frame 39 that is inserted through and fixed to the annular holding member 38 and fixed to the annular holding member 38 .

The expansion and contraction speed of the hydraulic cylinder 7 for moving the cutter is such that the expansion stroke of the hydraulic cylinder 7 becomes equal to the difference between the major axis and the minor axis of the shield machine body 1 within the time that the rotary cutter disk 3 rotates 90 degrees. The discharge amount of the hydraulic pump 15 is adjusted by appropriate means so as to obtain the above-mentioned hydraulic cylinder expansion/contraction speed.

In addition, the expansion pressurizing chambers 1 of the adjacent hydraulic cylinders 7A and 7B
1 is alternately supplied with pressure fluid from a hydraulic pump 15,
Each hydraulic cylinder 7A, 7B extends alternately, and when one hydraulic cylinder extends, the other hydraulic cylinder shortens,
The liquid in the expansion pressurizing chamber 11 in the hydraulic cylinder being shortened is discharged.

In the elliptical shield excavator of the above embodiment, when the cutter disk rotation drive device 27 is operated to rotate the rotary cutter disk 3, the slide cutter 6° cutter movement hydraulic pressure is increased as the rotary cutter disk 3 rotates. The cylinder 7, striker 10, etc. rotate, and the striker 1
When the first proximity switch S1 on the long axis line of the shield machine main body 1 is activated by 0, the electromagnetic switching valve 14 shortens the hydraulic cylinder on the long axis line by the signal of the first proximity switch S1 as shown in FIG. - When the hydraulic cylinder on the short axis line is switched to the extended position and the second proximity switch S2 on the short axis line of the shield machine main body 1 is activated by the striker 10, the signal from the second proximity switch S2 causes the fifth As shown in the figure, the electromagnetic switching valve 14 is switched to the short axis hydraulic cylinder extension position and the long axis hydraulic cylinder shortening position, so that the tips of the slide cutters 6 adjacent at an angular interval of 90° are shielded. The slide cutter 6 is moved by the cutter moving hydraulic cylinder 7 so as to move in an elliptical shape along the circumference of the machine body l.

In addition, in FIG. 7, 42 is the locus of the tip of the slide cutter 6.

When carrying out this invention, the striker 10 may be fixed at any position on the rotary cutter disk 3, and the proximity switches Sl and S2 may be fixed directly on the shield machine body 1.

〔Effect of the invention〕

Since this invention is configured as described above, it produces the effects described below.

A slide cutter 6 having a normal cutter bit is attached to the rotary cutter disk 3, and the rotary cutter disk 3
can be rotated with relatively small torque, and each cutter bit 5 in the slide cutter 6 can be used to cut even if the slide cutter 6 is in any position, so each cutter bit 5 can be used effectively. Furthermore, the striker lO rotating together with the rotary cutter disk 3 allows the first
When the proximity switch S1 is actuated, the electromagnetic switching valve 14 is switched to the long axis hydraulic cylinder shortening position and the short axis hydraulic cylinder extension position according to the signal from the first proximity switch Sl, and the striker 10 When the second proximity switch S2 on the short axis line of the shield machine main body 1 is activated,
The signal from the second proximity switch S2 causes the electromagnetic switching valve 1 to
4 is switched to the position where the hydraulic cylinder on the short axis line is extended and the hydraulic cylinder on the long axis line is shortened, and the tips of the slide cutters 6 adjacent to each other at an angular interval of 90' form an ellipse along the circumference of the shielding machine body l. Since the slide cutter 6 is moved by the hydraulic cylinder 7 for moving the cutter so as to move in the same direction, the hydraulic cylinder 7 for moving the cutter is precisely controlled to expand and contract by simple means, and rotates together with the rotating cutter disk 3. Each slide cutter 6 can be moved in an elliptical motion.

Further, when the shield machine main body 1 rolls, the oval tunnel can be dug while rotating the rotary cutter disk with the slide cutter in the opposite direction to correct the rolling.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of an elliptical shield tunneling machine, FIG. 2 is a vertical side view thereof, and FIG. 3 is a part of the elliptical shield tunneling machine. A cross-sectional plan view, FIG. 4 is a plan view showing the vicinity of the guide portion of the slide cutter, and FIG. 5 is a diagram showing the state in which the electromagnetic switching valve is switched to the position where the hydraulic cylinder on the major axis is shortened and the hydraulic cylinder on the minor axis is extended. , Fig. 6 shows the state in which the electromagnetic switching valve is switched to the short axis hydraulic cylinder extension position and the long axis hydraulic cylinder shortening position, and Fig. 7 shows the state in which the hydraulic cylinder for moving the cutter rotates with the rotating cutter disk. FIG. 3 is a schematic front view showing an expanded and contracted state. In the figure, 1 is the shield machine body, 2 is the cutter bit,
3 is a rotating cutter disk, 4 is a front opening guide groove, 5 is a cutter bit, 6 is a slide cutter, 7 is a hydraulic cylinder for moving the cutter, 8 is a pressurizing chamber for shortening, 9 is a conduit, 10 is a striker, 11 12 and 13 are pipelines, 14 is an electromagnetic switching valve, 15 is a hydraulic pump, 17 is a bit support arm, 18 is a hollow arm, 19 is a guide member, 2
0 is a connecting member, 22 is an annular driven gear, 23 is a partition/wall, 2
4 is a connecting ring, 25 is a connecting member, 27 is a cutter disk rotation driving device, 2 is a pinion, 29 is a slide member, 30 is a support member, 33 is an earth removal tube, and 36 is an earth removal screw.

Claims (1)

[Claims] A rotary cutter disk 3 equipped with a large number of cutter bits 2 is disposed at the front of a shield machine body 1 having an oval cross section.
Front opening guide grooves 4 extending in the radial direction of the disk are provided on the outer peripheral side of the rotating cutter disk 3 at intervals of 90° in the circumferential direction of the disk, and a large number of cutter bits 5 are provided in the front portion.
A slide cutter 6 equipped with a slide cutter 6 is slidably fitted into the front opening guide groove 4, and the rotary cutter disk 3 and the slide cutter 6 are connected to each other via a cutter moving hydraulic cylinder 7 extending in the longitudinal direction of the slide cutter. The shortening pressurizing chambers 8 of the adjacent cutter moving hydraulic cylinders 7 are connected via a pipe 9, and a striker 10 that rotates together with the rotary cutter disk 3 is installed near the major axis of the shield machine body 1. A first proximity switch S1 operated by the striker 10 is fixed directly or indirectly, and a second proximity switch S2 operated by the striker 10 is fixed directly or indirectly near the short axis of the shield machine body 1, The extension pressurizing chambers 11 of the adjacent cutter moving hydraulic cylinders 7 are connected to the conduits 12 and 13 and the electromagnetic switching valve 14 operated by the first proximity switch S1 and the second proximity switch S2.
One of the adjacent cutters moves so that the tip of the slide cutter 6, which is connected to the hydraulic pump 15 through the An oval shield excavator configured such that when one hydraulic cylinder for cutter movement is extended, the other adjacent hydraulic cylinder for cutter movement is shortened.