JPH08246787A - Expansion shield device - Google Patents

Abstract

PURPOSE: To enable it to widely correspond to the size of an exiasting pipe and to make the followability and selability of a device improvable by situating a crushing bit in the exiasting pipe to be crushed, and rotating a jack after being expanded wide. CONSTITUTION: A motor is started in operation, rotating two boring cutters 11 and 11, and an outer boundary of an exiasting pipe 10 is bored, thereby forming a tunnel inner wall which is reinforced by two segments 2 and 2. In addition, a body 1 is pushed forward by dint of a reaction made up of pressing the segment 2 with a driving jack 16. Next, if both jacks 3 and 3 are expanded wide at a position where the body 1 is advanced forward as far as the same degree as length of each crushing bit 4, the crusing bit 4 installed in an end of the jack 3 comes into contact with an inner surface of the existing pipe 10. Here the motor 5 is restarted, rotating the jack 3, and the existing pipe 10 is cut and crushed by the four crushing bits 4. At this time, a seal to fill up a clearance between a rotator 13 and the exiasting pipe 10 is installed there, and it is always contacted, under pressure, with the exiating pipe 10, and thus it is desirable that hermetrical-sealability in an inner part of a boring machine be further improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expanded shield excavator, and more particularly to a device for crushing an existing pipe and newly forming a large diameter pipe in the ground.

[0002]

2. Description of the Related Art Conventionally, when crushing an existing pipe to newly form a large diameter pipe in the ground, first, the existing pipe is crushed by some method, and then a large diameter pipe is formed again. It was

In recent years, various devices have been developed which can simultaneously carry out this work, for example, Japanese Patent Laid-Open No. 6-288.
There is one described in Japanese Patent No. 175. This is Figure 8
As shown in (1), the cylindrical main body 1 is rotated to advance in the ground to reinforce the formed tunnel inner wall with the segment 2. The existing pipe 10 to be crushed is located at the center of the inside of the main body 1, and the existing pipe 10 is crushed by the crushing bits 50 and 51 provided so as to sandwich the existing pipe 10 from the inside and the outside. ing. Then, the crushed waste is transferred backward by a conveyor (not shown). The crushing bits 50 and 51 are driven by a motor 52, and the main body 1 is driven by a motor 53.

As described above, there is an advantage that the crushing of the existing pipe and the construction of the new pipe can be carried out simultaneously.

[0005]

However, in the above-mentioned prior art, firstly, since two sets of crushing bits are fixed to the inside and the outside, the existing crushing bit having a predetermined specific diameter and thickness is installed. There is a problem that it is difficult to adapt to anything other than pipes, and the degree of freedom is low. Also, if the existing pipe is greatly curved, it is difficult to deal with this.

Secondly, it may be pointed out that the structure around the crushing bit becomes complicated, and when the existing pipe is meandering, the followability and sealability of the device are likely to be insufficient.
The present invention has been made in view of the above matters, and can widely support the size and bending of a pipe to be crushed, has a simple structure, can be constructed at low cost, and can follow a meandering existing pipe. It is a technical object to provide an expanded shield excavation device having improved property.

[0007]

In order to solve the above-mentioned technical problems, the present invention provides an expanded shield excavation device for rotating an excavation cutter 11 to crush the existing pipe 10 while advancing in the ground as follows. It has a different structure.

That is, the rotary body 13 is provided on the face side, and the excavating cutter 11 is provided on the outer peripheral portion of the rotary body 13.
Also, attach the jack 3 to the inner peripheral side of the rotating body 13,
The jack 3 can be expanded toward the outer peripheral portion, and a crushing bit 4 is provided at an end of the jack 3 and the crushing bit 4 is positioned in an existing pipe 10 to be crushed to expand the jack 3. The technical means consists of opening and rotating (corresponding to claim 1).

Here, the main body 1 has, for example, an excavating cutter 11 on the outer peripheral portion of the face of the face, and can be constructed so as to rotate outside the existing pipe 10. The jack 3 is preferably a hydraulic jack. The motor 5 is held on the side of the segment 2 of the present device, and rotates the excavating cutter 11 and the jack 3 together.

The excavating cutter 11 is arranged prior to the crushing bit 4, and these excavating cutters 1 are arranged.
1 and the crushing bit 4 are provided with a seal portion 21 that comes into contact with the outer peripheral surface of the existing pipe 10 and fills the clearance between the rotating body 13 and the existing pipe 10. The seal portion 21 is always the existing pipe. It may be configured so as to be in pressure contact with 10 (corresponding to claim 2).

Further, the excavating cutter 11 is arranged in advance of the crushing bit 4, and the rotation of the excavating cutter 11 is brought into contact with the outer peripheral surface of the existing pipe 10 between the digging cutter 11 and the crushing bit 4 to rotate the rotating pipe. A seal portion 21 for filling the clearance between the body 13 and the existing pipe 10 is provided, and the seal portion 2 is provided.
1 is always in pressure contact with the existing pipe 10 and the sealing portion 2
Cutter 1 for cutting the outer peripheral surface of the existing pipe 10 prior to 1.
9 can be provided. The cutter 19 is the existing pipe 10.
The outer surface of the cutting tool is slightly cut to be smoothed, and is preferably provided so as to be retractable inside the excavating cutter 11 (corresponding to claim 3).

Further, inside the excavating cutter 11,
A seal 26 for filling the clearance with the existing pipe 10,
It is preferable that 27 and 28 are provided, and these seals are constantly brought into pressure contact with the existing pipe by springs (coil springs) 29, 30, 31 or hydraulic pressure. Here, as the spring, in addition to the coil spring, a leaf spring,
Alternatively, an air spring can be used. Grease may be pressure-fed around the seals 26, 27, 28 to further enhance the airtightness.

On the other hand, in order to cope with an existing pipe that is sharply curved, it is possible to adopt a center-bent structure generally used in a shield device.

[0014]

The outer periphery of the existing pipe is excavated by starting the motor 5 and rotating the excavating cutter. The inner wall of the tunnel formed at this time is reinforced by the segment 2,
The main body 1 advances due to the reaction force of pressing the segment 2 with the propulsion jack.

At this time, the existing pipe is located at the center of the tubular main body 1, but the jack 3 is expanded at a position where the main body 1 has advanced to some extent, preferably at a position which has advanced to the same extent as the length of the crushing bit 4. Let Then, the crushing bit 4 provided at the end of the jack 3 comes into contact with the inner surface of the existing pipe. Here, the motor 5 is started again, the jack 3 is rotated, and the existing pipe is cut by the crushing bit 4 and crushed. The pressing force of the crushing bit 4 is adjusted by the hardness of the existing pipe. But,
When the hardness of the existing pipe is high, the advance position of the main body 1 is shortened, and the cutting length of the crushing bit 4 at one time is shortened.

At this time, when a smoothing cutter that slightly cuts the outer surface of the existing pipe is provided on the inner surface of the main body 1, the surface of the existing pipe is smoothed and the airtightness is improved.
Further, if the seals 26, 27 and 28 are provided and the seals are constantly in pressure contact with the existing pipe, the hermeticity of the inside of the excavator is improved and muddy water or the like does not flow into the existing pipe.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The main body 1 is a tubular body having an outer diameter substantially the same as the outer diameter of the newly installed pipe (segment 2), and an excavating cutter 11 is provided on the outer periphery on the face of the face. This excavating cutter 11 has an annular plate 12 with a 90 degree positional difference.
It is provided in pairs.

The inside of the cutter 11 for excavation is opened so that the existing pipe 10 to be crushed is inserted. A disc-shaped rotating body 13 is provided in the middle of the main body 1, and a shaft 14 is formed at the center of the rotating body 13. The shaft 14 is provided between the rotating body 13 and the main body 1 by a motor 5 By the bearing 22 installed close to
It is rotatably supported.

Two hydraulic type jacks 3 are fixed to the face of the partition wall 13 in opposite directions. A crushing bit bed 4a is provided at each tip of each of the jacks 3, and the head 4
a is installed facing 180 ° different direction. Each of the crushing bit beds 4a is provided with three sets of crushing bits 4. The crushing bit 4 is formed into an abacus ball shape. The frontmost one of the crushing bit beds 4a has an angle of about 30 degrees. By providing this angle, the casing of the crushing bit 4 does not come into contact with the surface of the existing pipe and cannot be cut, and the existing pipe 10 thicker than the crushing bit 4 can be crushed. Similarly, the rearmost crushing bit 4 in the other crushing bit bed 4a is also provided with an angle of about 30 degrees. The jack 3 and the crushing bit 4 rotate as a unit.

Although two sets of the crushing bits 4 are provided so as to face each other in the one shown in FIG. 2, four sets may be provided in a cross shape. A gear 36 is provided on the outer circumference of the inner surface of the rotating body 13.
Is attached, and the motor 5 meshes with it. The motor 5 is joined to the forward jack 16. The tip of the propulsion jack 16 is the segment 2
It is closely attached to and is firmly fixed.

With the above structure, when the motor 5 is started, the crushing bit 4 is rotated via the rotating body 13.
Further, the protrusion amount of the crushing bit 4 can be arbitrarily set by the operation amount of the jack 3. Further, the motor 5 is provided with an excavating cutter 1 provided on the outer side of the rotating body 13 via the rotating body 13.
1 can also be rotated.

A conveyor 17a, which is in communication with the cutting cutter 11 of the main body 1, is provided on the outer peripheral side of the cutting cutter 11 so as to carry out the earth and sand excavated by the excavation cutter 11. This conveyor 17a and the main body 1
Between them, a seal 40 is provided so as to prevent dirt and the like from entering the main body 1.

A smoothing cutter 18 for slightly cutting the outer surface of the existing pipe 10 is provided inside the tip portion of the main body 1 so as to be retractable. The smoothing cutter 18 is provided at the tip of a cutter bed 19 at an angle of about 60 degrees, and the cutter bed 19 is provided in the hydraulic cylinder 2.
It is fixed to the main body 1 via 0. Thus, the amount of protrusion of the smoothing cutter 18 can be adjusted by adjusting the hydraulic pressure to the hydraulic cylinder 20. As shown in FIG. 7, the smoothing cutter 18 is controlled so as to always contact the outer surface of the existing pipe 10, and the outer surface of the existing pipe 10 is slightly cut to smooth the surface. Has become. As a result, the seal portion 21 described below sufficiently exhibits its function.

The seal portion 21 has ring-shaped seal beds 23, 24, 25 and seals 26, 27,
28 are attached to the respective seal beds 23, 24, 25, and the seal beds 23, 24, 25 are coil springs 29, 30,
They are pressed against the outer surface of the existing pipe 10 by 31, respectively. The seal bed 23 is located on the face of the face, and its tip has an inclination of about 45 degrees. A thrust seal 32 is inserted between the rear wall of the seal bed 23 and the main body 1. A thrust seal 33 is also inserted between the front wall of the seal bed 24 and the main body 1. A grease gate 34 is provided between the seal bed 23 and the seal bed 24, and a grease gate 35 is provided between the seal bed 24 and the seal bed 25. Grease is pressure-fed to the grease gates 34 and 35 at a high pressure so that no gap is generated between the main body 1 and the existing pipe 10.

Even in the existing pipe 10 which is curved due to the above-mentioned structure, the seals 26, 27 and 28 follow the expansion and contraction thereof, and the sealing property is perfected by the grease. By using the labyrinth structure in this way, it is possible to easily follow the existing pipe even if it is meandering, and the sealing property is also improved.

In the construction described above, it is necessary to advance the cylindrical main body 1 when actually carrying out the construction.
Then, the motor 5 is started and the excavating cutter 11 is rotated to excavate the face. The inner wall of the tunnel formed at this time is sequentially reinforced by the segment 2, and the main body 1 is moved forward by pushing the segment 2 with the propulsion jack 16.

At this time, the existing pipe 10 is inserted into the center of the cylindrical main body 1. Then, the main body 1 stops advancing at a position where it has advanced to some extent, and the jack 3 is expanded. Then, the crushing bit 4 provided at the end of the jack 3
Contacts the inner surface of the existing pipe 10. Here, the motor 5 is restarted to rotate the jack 3 and the crushing bit 4 is used to connect the existing pipe 1
Crush 0. At this time, the propulsion jack 16 does not operate, the excavating cutter 11 rotates, but the face is not excavated, and the main body 1 does not move forward.

Then, the crushed material of the existing pipe 10 is carried out to the outside by the lower conveyor 17b. Then, when the crushing of the existing pipe 10 for a certain distance is completed, the rotation is stopped and the jack 3 is contracted.

Next, the excavating cutter 11 is rotated again to excavate and is moved forward by the propulsion jack 16, and the cycle similar to the above is repeated to alternately break the existing pipe 10 and install the new pipe (segment 2). carry out.

In the apparatus of this embodiment, the main body 1 is used during excavation.
In order to prevent the eccentricity from moving eccentrically, a sensor 38 is installed at the tip of a casing 37 accommodating the jack 3. This is slidably accommodated in a cylindrical cover 39 to protect it from dust when the existing pipe is crushed. When the crushing of the existing pipe 10 is stopped, the distance to the existing pipe 10 is measured while sliding horizontally from the inside of the cover 39 and protruding to the outside and rotating with the jack 3. It is detected whether the distance to the existing pipe 10 is uniform over the entire circumference, and if it is eccentric, the direction of the excavating cutter 11 is adjusted to correct the position of the main body 1 with respect to the existing pipe 10.

[0031]

According to the present invention, since the projecting amount of the crushing bit can be arbitrarily adjusted by the jack, it is possible to widely correspond to the size of the pipe to be crushed.

Moreover, since the motor for driving the main body and the motor for driving the crushing bit are used in common, the structure is simple and the cost can be reduced. Further, by providing a seal that fills the clearance between the rotating body and the existing pipe, the followability and sealing performance of the device are improved even when the existing pipe meanders.

[Brief description of drawings]

1 is a cross-sectional view of the device of the present invention.

FIG. 2 is a front view of the device of the present invention.

FIG. 3 is a cross-sectional view around a crushing bit.

FIG. 4 is an enlarged cross-sectional view of a shield part.

FIG. 5 is a cross-sectional view showing the structure of a smoothing cutter.

FIG. 6 is a cross-sectional view showing a smoothing cutter structure.

FIG. 7 is an operation explanatory view of the smoothing cutter showing the embodiment of the present invention.

FIG. 8 is a sectional view showing an example of a conventional enlarged shield excavating device.

[Explanation of symbols]

 1 ・ ・ Main body, 2 ・ ・ Segment, 3 ・ ・ Jack, 4 ・ ・ Crushing bit, 5 ・ ・ Motor, 10 ・ ・ Existing pipe, 26,27,28 ・ ・ Seal, 29,30,31 ・ ・ Coil spring .

Claims (3)

[Claims] 1. An enlarged shield excavator for rotating an excavating cutter to crush an existing pipe while advancing in the ground, wherein a rotating body is provided on the face of the face and the excavating cutter is arranged on the outer peripheral portion of the rotating body. In addition, a jack is attached to the inner peripheral side of this rotating body, this jack can be expanded toward the outer peripheral part, a crushing bit is provided at the end of this jack, and the crushing bit is an existing one to be crushed. An expanded shield excavator characterized by being positioned inside a pipe to expand and rotate a jack. 2. The excavating cutter is arranged prior to the crushing bit, and is in contact with the outer peripheral surface of the existing pipe between the digging cutter and the crushing bit to contact the rotating body and the existing crusher. The expanded shield excavator according to claim 1, wherein a seal is provided to fill a clearance with the pipe, and the seal is constantly in pressure contact with the existing pipe. 3. The excavating cutter is arranged prior to the crushing bit, and is in contact with the outer peripheral surface of the existing pipe between the digging cutter and the crushing bit to contact the rotating body and the existing crushing bit. The expanded shield excavator according to claim 1, further comprising a seal for filling a clearance with the pipe, the seal being constantly in pressure contact with the existing pipe, and a cutter cutting the outer peripheral surface of the existing pipe prior to the seal.