JPS62288298A - Cutter device for shield excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention "Field of Industrial Application" This invention relates to a cutter device for a shield excavator used when constructing underground tunnels.

"Prior Art" The applicant has previously provided an underground bonding method for shield tunnels.

This construction method includes a first shield excavator and a skin plate, in which the tip of the skin plate is double formed by an outer cylinder and an inner cylinder, and a penetrating ring is stored between the outer cylinder and the inner cylinder. A second shield tunneling machine, which is double formed by an outer cylinder and an inner cylinder having the same diameter as the first shield tunneling machine, is connected in the middle of the tunnel to be constructed as one set. In the process of excavating a tunnel from both ends, and at the end of the tunnel excavation process, the penetrating ring of the first shield excavator described in 11-j is attached to the axis of the first shield excavator. Power J7. II move U
・A step of covering the ground at the tunnel joint portion left between the first and second shield tunneling machines with the penetration ring, and after the completion of this step, covering the first and second shield tunneling machines. It consists of the steps of dismantling the shield excavator while leaving the skin plate, excavating the ground at the joint, and further lining the wall surface of the joint by pouring concrete on the inner surface of the skin plate. It's Shino.

One of the most important steps in Tononel's underground joint construction method is the above-mentioned step of "sliding the penetration ring of the first shield excavator in the 071 direction along the axis of the first shield excavator," This step is a step of covering the ground at the tunnel junction with a penetrating ring that is left between the first and second shield tunneling machines. Then, when pushing out the penetration ring in the second step, it is necessary to reduce the tip of the cutter device in the radial direction of the skin plate so that the penetration ring does not hit the tip of the cutter device.

Conventionally, as a cutter device of this type whose tip portion is expandable and retractable in the radial direction of the skin plate, a cutter device equipped with a copy cutter on the outer periphery is known.

``Problems to be Solved by the Invention'' However, the copy cutter of the conventional cutter device is intended for controlling the direction of the shield excavator, and does not over-excavate the ground in the direction in which the shield excavator is turned. It is a device for Therefore, the copy cutter cannot be used during normal excavation except when changing direction, and the cutter device equipped with the copy cutter has an outer circumference formed to have the same outer diameter as the outer circumference of the skin plate. The copy cutter has only a small amount of expansion and contraction (approximately 15 cm) radially outward from the outer peripheral surface of the skin plate so that it can rotate, and the cutting edge is only formed at the tip. However, there was a problem in that the device provided by the present applicant was not suitable as a cutter device for underground joint construction of shield tunnels.

The present invention has been made in view of the above-mentioned problems, and has the ability to expand and contract from the inside of the inner peripheral surface of the skin plate to the outside of the outer peripheral surface of the skin plate, that is, has a large amount of expansion and contraction in the radial direction of the skin plate. Another object of the present invention is to provide a cutter device for a shield excavator that is equipped with an excavation blade on the front surface of the cutter and is capable of excavating even during normal excavation.

"Means for Solving the Problem" In order to solve the problem, the present invention provides a center shaft provided on the central axis of the skin plate, and a center shaft extending from the tip of the center shaft in a radial direction of the skin plate. a spoke that extends radially from the spoke and has a cutting edge on its surface; a tip blade that is disposed inside the spoke and is expandable and retractable in the radial direction of the skin plate from the inside of the spoke; and a hydraulic device that expands and contracts the spokes into and out of the spokes.

In this case, it is desirable that a cutting edge is also formed on the front surface of the tip blade.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 and 2 show an embodiment of the device of the present invention, and Figures 3 to 6 show an example of an underground joint method for shield tunnels using the device of the present invention. It is a sign that shows.

First, to explain the cutter device C of the shield tunneling machine using FIG. 1 and FIG. A shaft portion (center shaft) 3 is provided that protrudes from the tip and is movable in the excavation direction (X-Y direction in the arrow direction). Six spokes 4, 4°... extend radially to the inside of the inner peripheral surface of the skin plate 1a, and cutting blades 5, 5...・
...is fixed. A tip blade 6 is disposed inside each of the spokes 4, and the tip blade 6 is expandable and retractable in the radial direction to the outside of the outer peripheral surface of the skin plate la, and the tip blade 6 is hydraulically operated. It is adapted to be expanded and contracted in and out of the spokes 4 by means of a device 7.

Furthermore, the tip blade 6 has cutting blades 8, 8. ... is formed, and the base end portion 8a
is connected to a hydraulic jack 7a of a hydraulic device 7 via a shaft 9. The hydraulic system 7 is composed of the hydraulic jack 7a and a power unit 7C that drives the hydraulic jack 7a via piping 7b, 7b, . . . .

Next, using FIG. 3 to explain the f-2-knoll l-excavation machine equipped with the cutter device C of the present invention, the symbol G is the ground near the joint of the knoll tunnel excavated from both ends; In the ground G, the first 71-grid machine I uses a cutter device C installed on the grinding surface to excavate a tunnel (a) on the right side. ,Up,
・This second shield excavator 2 has a cutter device C installed on its surface (the lower 17″) (same configuration as the Noord machine)
A tunnel Tb is being excavated on the left side. A tunnel is formed behind the shield tunneling machine 1.
The wall surface of I'a is primarily lined with segments S a, S a, ... assembled inside this shield excavator 1, and the tunnel Tb formed behind the shield excavator 2 The wall surfaces of segments sb, sb, etc. assembled inside this shield excavator 2 are
The primary lining is being carried out by...

The tip end 1b of the skin plate 1a of the first shield tunneling machine l has an outer cylinder 11 formed to have the same diameter as the skin plate 1-1a, and an inner cylinder 12 formed to have a smaller diameter than the outer cylinder II.
It is formed in double form. Between the outer cylinder 11 and the inner cylinder 12, a cylindrical penetrating ring 13 that is integrally or divided into a plurality of pieces is stored and retracted.
A bulge 1 < 13 a is formed at the rear end of 3. At the same time, a highly viscous water sealing agent such as rubberized asphalt or grease is filled between the second outer cylinder 11 and the inner cylinder 12. When water is applied, it is designed to prevent the intrusion of excavated earth and sand during excavation.Inside the inner cylinder 12, there are formed 5 grooves that are perpendicular to the axis of the Noord excavator I. A partition plate 14 is provided.The inner cylinder 12 and the skin plate la are connected by a ring-shaped bearing plate 15 formed perpendicular to the axis of the tunnel excavator I. Bearing plate 1
5 has an extrusion jack l7. +
7. ... are attached, and this extrusion jack 1
The working end 17a of No. 7 is in contact with the rear surface of the penetrating ring bulge 13a. Further, on the rear surface of the bearing pressure plate 15, there is a propulsion jack l8.18. ... are attached, and the working end 18a of this propulsion jack is in contact with the side surface of the segment Sa at the tip. The single cutter device C provided on the surface of the first shield excavator I is supported by the shield excavator I by having its shaft portion 3 pivotally supported by the partition plate 14 .

The second shield excavator 2 includes a skin plate 2a formed in a cylindrical shape with the same diameter as the first skin plate Ia.
is provided, and the tip portion 2b of this skin plate 2a is
Similar to the first shield excavator l, it is double formed by an outer cylinder 21 formed to have the same diameter as the skin plate 2a, and an inner cylinder 22 formed to have a smaller diameter than this outer cylinder 21. .

A highly viscous water replenishing agent such as rubberized asphalt or grease is filled between the outer cylinder 21 and the inner cylinder 22 to stop water and prevent excavated soil from entering, similar to the first shield machine. It is supposed to be done. A partition plate 24 is provided inside the inner cylinder 22 and is formed to be perpendicular to the axis of the wall-shaped tunnel excavator 2 . Inner cylinder 22 and skin plate 2
a is connected to the shield tunneling machine 2 by a ring-shaped bearing plate 25 formed perpendicular to the axis of the shield tunneling machine 2. In addition, the skin plate 2a has a ring 2 inside it.
3 are provided on the rear surface of the ring 23, and propulsion jacks 28.28. ...or several are installed. The working end 28a of the propulsion gloss 28 is in contact with the side surface of the segment sb at the tip.

The cutter device C of the second shield excavator 1a2 is supported by the shield excavator 2 by having its shaft portion 3 pivotally supported by the partition plate 24.

In addition, the first and second shield excavators 1.2 include a fourth
As shown in the figure, each mud injection pipe +6.26
is arranged, and the open end of this pipe 16.26 is
It is located at the tip of each shield tunneling machine 1.2.

Next, the underground joining method of the present invention will be explained using FIGS. 3 to 6.

(i) First, from the right side in FIG. 3, the ground G is excavated by the cutter device C using the first shield excavator 1,
Segments S a, S a, ·
The lining of ... is carried out, and this segment Sa, Sa, ...
The reaction force is taken and the propulsion jack is 18° + 8. By driving..., one of the tunnels J and T a is built up. Enables excavation of tunnels with the same diameter.

At the same time, from the left side in FIG. 3, the second shield excavator 2 is used to excavate the ground G with the cutter device C, and the walls of the excavated pit are covered with segments Sb, Sb, etc.
28.28. By driving..., the other tunnel Tb is constructed. At this time, by extending the tip blade 6 of the cutter device C of the second shield excavator 2, the cutter device C is shifted so that it can excavate a tunnel with the same diameter as the skin plate 2a.

Then, at the junction of the tunnel, the first 7-rut excavator 1 and the second shield excavator 2 are connected to the ground excavator Gi of a predetermined length.
(approximately 30 cm to 1-1 cm) and face each other.

Next, as shown in FIG. Second knoll l'i+, 2 extended tip blades 6.6. ... is reduced by driving the hydraulic device 7 and the spokes 4.4. It should be placed inside the pipe 16.
．． 26 is used to prevent the subsidence of the ground G1 by press-fitting clay into the ground G1 at the Tononel joint.

(11) Next, as shown in FIG. 5, drive the pushing jack 17 of the first shield tunneling machine 1 to
3 is inserted into the gap between the outer cylinder 21 and the inner cylinder 22 of the second shield tunneling machine 2. Slide this penetrating ring 13 forward along the axis of the shield tunneling machine I. make it move. Thereby, the penetration ring 13 covered the ground Gi at the tunnel joint portion left between the first shield excavator 1 and the second shield excavator 2. here,
The rubberized asphalt or grease filled between the outer cylinder II, 21 and the inner cylinder 12.22 is
According to the extrusion of step 3, it oozes out from the gap between each skin plate 1a and 2a into the ground Gi at the joint.

(iii) Then, as shown in FIG.
At the same time, the partition plates 14 and 24 were cut and removed, and both ends of the 11-person ring 13 were removed from the inner cylinder I2.
Weld to 22. Next, the construction of the shield tunnel joint is completed by lining the joint wall by pouring concrete 3I, which includes the thickness of the secondary lining, on the inner wall of the skin plate. be done.

As described above, in the underground joint construction method for a shield tunnel using the cutter device of the present invention, the ground mass Gi of the tunnel joint is provided at the tip 1b of the skin plate of the first shield excavator 1. Since it is covered by the penetration ring 13, the penetration ring 13 performs soil retention and water supply at the joint. Therefore, it is possible to construct the shield tunnel joint without using auxiliary construction methods such as the freezing construction method, and it is also possible to significantly reduce the construction cost and construction period required for tunnel jointing.

Further, in this embodiment, the spokes 4, 4 . Since the outer diameter of the inner cylinders 12, 22 is slightly smaller than that of the inner cylinders 12, 22, the tip blades 6.6, . . . are connected to the spokes 4, 4. By moving the shaft parts 3 backward in the excavation direction of the shield machine 1.2, the cutter device C is connected to the tip of the inner cylinder 12.22 and the partition plate 14.
．． It becomes possible to store it in the frame formed by 24. Therefore, in step (ii), even if the propulsion jacks 18.28 are further driven to bring the shield tunneling machines 1 and 2 closer together after the tip blade 6 is shortened, the first and second shield tunneling machines 1 and 2
The cutter devices C never come into contact with each other.

Therefore, by bringing the shield tunneling machines 1.2 closer together and facing each other, it is possible to better ensure water quality at the tunnel junction.

In addition, by making the tip blade 6 of the cutter device C protrude outside the outer cylinders 11 and 2l, it is possible to return the ground in the direction in which the shield machine is turned, and it is possible to control the direction of the Nord 1 rotation similarly to the copy cutter. It is possible to do this.

In this way, the cutter device of the present invention operates from the inside of the inner peripheral surface of the inner cylinder 12.22 to the outside of the outer peripheral part of the outer cylinder 11.21 in the radial direction of the skin play 1 by driving the hydraulic device 7. The cutter has a large expansion and contraction capacity, and a cutting blade is provided on the face of the cutter, making it possible to excavate even during normal excavation.

- Effects of the Invention As explained above, the cutter device of the present invention includes a spoke that extends radially from the tip of a center shaft and has a cutting edge on its surface, and a spoke that is disposed inside the spoke. In addition, the skin plate is equipped with a tip blade that can extend and contract in the radial direction of the skin plate from inside the spoke, a hydraulic device that expands and contracts this tip blade, and a cutting blade on the front of the tip blade. The skin plate 1 can be expanded and contracted from the inside of the inner peripheral surface to the outside of the outer peripheral part of the skin plate, that is, the skin plate 1 has a large amount of expansion and contraction in the radial direction, and can be excavated even during normal excavation.

[Brief explanation of drawings]

1 to 6 show an embodiment of the device of the present invention,
Figures 1 and 2 use the apparatus of the present invention, and Figures 3 to 6 use the apparatus of the present invention to explain an example of the underground joint method for Nord-Tonnanel in this case. Figure 1 is a side sectional view of the cutter 1η of the shield machine, Figure 2 is a side view of the cutter device, and Figure 3 shows the tunnel to be constructed being excavated from both ends by two Knoll F 14s. A side sectional view of the tunnel, Figure 4 shows a state in which the cutter device of the shield machine is reduced.
FIG. 5 is a side sectional view of the tunnel showing the area where the ground at the joint is covered by the penetration ring, and FIG. 6 is a side sectional view of the tunnel in a completed state after dismantling the shield machine. G...Ground, Gl...Tunnel junction ground, l...First shield excavator, 2...
...Second shield tunneling machine, Ia, 2a...
Skin plate, lb. 2b... Skin plate tip, 3...
・Center shaft (shaft), C... Cutter device, 4... Spoke, 5... Cutting blade, 6
... Tip blade, 7 ... Hydraulic system, 11.
21...Outer cylinder, 12.22...Inner cylinder,
13...Penetration ring.

Claims (2)

[Claims] (1) A cutter device for a shield excavator equipped at the front of a cylindrical skin plate for excavating a ground,
a center shaft provided on the center axis of the skin plate; a spoke extending radially from the tip of the center shaft in the radial direction of the skin plate and having a cutting edge on the surface; A shield excavator comprising: a tip blade that is extendable in the radial direction of the skin plate from inside the spoke when disposed; and a hydraulic device that expands and contracts the tip blade in and out of the spoke. cutter device. (2) The cutter device for a shield excavator according to claim 1, wherein the tip blade has a cutting blade formed on the front side as well.