JPH0510086A - Shield excavator - Google Patents

Abstract

PURPOSE:To make it possible to continuously construct a tunnel having different diameters by incorporating an excavator having a smaller diameter into a shield excavator, sharing a driving device and a driving jack with both excavators, and forming cutters of both excavators in a separable manner respectively. CONSTITUTION:A shield jack 13 of an inside excavator 2 is extended to move a transfer table 14 backward, and force of the jack 13 is transferred to a large diameter segment 3 to drive a shield excavator. And, at the same time, a disc cutter 21 is rotated to take earth into a chamber 22, the earth is removed to the outside of a shaft and, at the same time, the large diameter segment 3 is assembled backward of the excavator 2. After that, when the diameter of a tunnel is changed into the diameter of a small diameter segment, a circular segment is mounted to the end of the segment 3, and the small diameter segment is mounted to the inside of the circular segment. Then, the connection of the cutter 21 with a circular cutter 12 is released. In addition, the jack 13 is extended to the small diameter segment, the excavator 2 is driven and, at the same time, the small diameter segment is assembled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine used for excavating a tunnel whose section changes.

[0002]

2. Description of the Related Art In a sewer, the flow rate of the sewer increases as it goes downstream. Therefore, it is necessary to increase the diameter of the tunnel. In such a case, if a vertical shaft can be provided at the changing position of the cross section, a shield machine with a large diameter can be launched from there.

[0003]

However, considering the current situation of the land in the city, it is not possible to freely install a shaft in a necessary place. For that reason, it was necessary to take an uneconomical measure such as constructing a large-diameter tunnel in the upstream side, which would not be necessary.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem. When excavating a tunnel from the downstream side, a tunnel having a small diameter is excavated from the changing portion of the cross section to obtain the tunnel diameter. It is an object of the present invention to provide a shield machine capable of coping with changes in

[0005]

That is, according to the present invention, a shield machine having a diameter smaller than the diameter of the shield machine is built in one shield machine, and an outer machine and an inner machine are used. It is a shield machine, which shares a machine drive device, a propulsion jack, and the like, and is configured such that the cutter of the outer machine and the cutter of the inner machine can be separated.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure of the present invention will be described with reference to the drawings. <A> Outer Excavator The shield excavator according to the present invention includes an outer excavator 1 and an inner excavator 2. The outer machine 1 is a steel cylinder, and an inner cylinder 11 is provided inside. The inner diameter of the inner cylinder 11 is formed to be equal to the outer diameter of the inner excavator 2. An annular cutter 12 is provided on the front surface of the outer machine 1. The annular cutter 12 is an annular body having a hollow inside, and a bit for excavation is projectingly provided on the front surface thereof. The outer machine 1 does not need to be provided other than the above devices.

<B> Inner Excavator 2 The inner excavator 2 is a shield excavator having a diameter that can be accommodated in the inner cylinder 11 of the outer excavator 1. A shield jack 13 is installed in the inside thereof in addition to a cutter driving unit, a muddy water sending / discharging device, and the like. This jack 13 is the outer excavator 1
Propulsive force can be applied to the outer machine 1 during the excavation, and to the inner machine 2 during the excavation of the inner machine 2.
However, since the diameters of both are not the same, the position of the segment that receives the reaction force of propulsion is different. Therefore, when the outer excavator 1 is propelled, a transmission base 14 is provided at the tail end of the jack 13 so as to project in the circumferential direction. The transmission base 14 can transmit the propulsive force of the jack 13 located inside to the large diameter segment 3 having a large diameter when the outer excavator 1 is propelled. A disc cutter 21 is provided on the front surface of the inner machine 2. The disc cutter 21 is located inside the annular cutter 12 and is configured so that both can be integrated with each other by a pin or the like or separated from each other.

Construction Method Next, a construction method using the shield machine will be described. <A> Excavation of a tunnel with a large diameter. The outer excavator 1 is propelled by applying a reaction force to the large diameter segment 3 corresponding to the large diameter tunnel. At this time, the inner excavator 2 is built inside the outer excavator 1, and both are firmly integrated by bolts or the like. However, if the tip of the inner excavator 2 projects into the chamber 22 behind the cutter, a partition will be formed inside the chamber. Therefore, the inner machine 2 is arranged in a retracted position. By extending the jack 13 of the inner machine 2 in such a state, the transmission base 14 can be moved rearward and the force of the jack 13 can be transmitted to the large diameter segment 3 to obtain the propulsive force of the shield machine. Simultaneously with the propulsion, the cutter on the front side is rotated to take the earth and sand into the chamber 22 and discharge it as muddy water or by another known method to the outside of the mine. The rotation of the cutter is performed by a drive device arranged inside the inner excavator 2. The rotational force of the drive device is first transmitted to the disk cutter 21 of the inner excavator 2 and its rotation is transmitted to the annular cutter 12 arranged on the outer side. Thus, the excavation of the tunnel having the large cross section and the assembling of the large diameter segment 3 at the rear are continued.

<B> Operation at the changing portion of the cross section. (FIG. 2) When reaching the boundary where the cross section of the tunnel becomes small, the connection between the outer excavator 1 and the inner excavator 2 is disassembled by removing bolts or the like. Then, the inner excavator 2 is advanced slightly so that the tip of the excavator 2 is brought into contact with the disk cutter 21. Further, the transmission base 14 for transmitting the thrust of the jack 13 is removed.
Next, a cylinder having the same diameter is attached to the rear end of the inner excavator 2 by welding or the like, and this is extended as a tail plate 23. (Figure 3)

<C> Excavation of a tunnel having a small diameter. (FIG. 4) In order to change the diameter of the tunnel from the diameter of the large diameter segment 3 to the diameter of the small diameter segment 4, a connection between them is required. For that purpose, an annular segment 31 is attached to the end of the large diameter segment 3. This annular segment 3
Reference numeral 1 is a ring whose outer diameter is equal to that of the large diameter segment 3 and whose inner diameter is equal to that of the small diameter segment 4. The small diameter segment 4 is attached to the inside of the annular segment 31, and the small diameter segment 4 is assembled inside the tail plate. Further, the disc cutter 21 on the front surface and the peripheral circular cutter 12 are disconnected. When the jack 13 is extended toward the small-diameter segment 4 in such a state, the inner excavator 2 takes a reaction force to the small-diameter segment 4 and starts to slide out from the inner cylinder 11 to start the forward movement. The process of assembling the small-diameter segment 4 as the inner excavator 2 advances is similar to the conventional process. When the inner excavator 2 advances, only the tubular body of the outer excavator 1 and the annular cutter 12 are left, and all other devices are used by the inner excavator 2.

<D> Multi-stage shield excavator Although the above is a shield excavator composed of two stages, it is also possible to store three-stage or four-stage small shield excavators with the same structure. Is. In that case, the disc cutter of the innermost final stage shield machine and the annular cutters of the outermost stages are connected by a radial pin. The pin is constructed so that it can be pulled out freely by a radial jack provided on the disc cutter.

[0012]

EFFECTS OF THE INVENTION <A> Since the present invention has the above-described structure, a vertical shaft is not provided at a portion where the cross section changes.
It is possible to build small diameter tunnels continuously from large diameter tunnels. <B> In addition, since the number of members that are abandoned in the changed portion of the cross section is minimal and most of the equipment can be used by the inner excavator 2, two shield excavators of large diameter and small diameter are used. It is extremely economical compared to the method.

[Brief description of drawings]

FIG. 1 is an explanatory view of a usage state of the device of the present invention.

FIG. 2 is an explanatory view of a usage state of the device of the present invention.

FIG. 3 is an explanatory view of a usage state of the device of the present invention.

FIG. 4 is an explanatory view of a usage state of the device of the present invention.

Continued front page    (72) Inventor Tadao Hirayo             1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei             Construction Co., Ltd. (72) Inventor Hiroyuki Ito             13 Showa-machi, Minato-ku, Nagoya-shi Harimaju Ishikawajima             Industry Co., Ltd. Nagoya factory (72) Inventor Toshiaki Uehara             13 Showa-machi, Minato-ku, Nagoya-shi Harimaju Ishikawajima             Industry Co., Ltd. Nagoya factory

Claims (4)

[Claims] Claim: What is claimed is: 1. A shield machine having a diameter smaller than that of the shield machine is built in one shield machine, and an outer machine, a drive unit for the inner machine, a propulsion jack, etc. A shield machine that is shared and is configured so that the cutter for the outer machine and the cutter for the inner machine can be separated. 2. The shield machine according to claim 1, wherein the propulsion jack is provided on the inner machine, and a pressure plate protruding in the circumferential direction is attached to the tail end of the jack. 3. The shield machine according to claim 1, wherein the cutter on the front side of the machine includes an outer annular cutter and an inner disk cutter. 4. The front cutter of the excavator comprises an outer annular cutter and an inner disc cutter. The inner disc cutter can be inserted into and withdrawn from the outer annular cutter by a jack. The shield machine according to claim 1 or 3.