JP2965856B2 - Double-row shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for excavating a double-row cross section tunnel, and more particularly to a shield machine capable of forming a double-row cross section tunnel having a vertically long cross section to easily branch and join the tunnel.

[0002]

2. Description of the Related Art The use of shield excavators for excavating underground tunnels is increasing, and various types of double-section shield excavators, so-called double-row shield excavators are used for excavating wide tunnels with one excavator. Die shield excavators have also been adopted as actual machines, and their implementation is planned.

Conventionally, a double-row shield excavator of this type has a common shield shell in the shape of an oblong or sideways Dharma which is formed by wrapping a part of two cylinders and connecting them side by side. Two rotary cutters are partially wrapped around the front end of the shield shell and two rotary cutters are arranged on the same plane (for example, see Japanese Patent Application Laid-Open No. 62-99597).
No.) or two rotary cutters that are displaced in the longitudinal direction of the excavator (for example, Japanese Patent Publication No. 3-78917).
No.) has been proposed.

[0004] Further, two rotary cutters are arranged in two vertical stages so as not to interfere with each other at a front end portion of a common shield shell having a vertically long circular shape or an upright Dharma shape (for example, see Japanese Patent Application Laid-Open No. 60-1985). No. 141993) has also been proposed.

[0005]

As described above, a double-row shield excavator equipped with two rotary cutters has a
The configuration in which two rotary cutters are arranged on the same plane has a problem of preventing interference between the two rotary cutters.
The face plate configuration of the two rotary cutters is a spoke type in which a number of cutter bits are attached to both sides of a cutter spoke that extends radially around the rotation axis, or a fan type in which the shaft extends outward from the shaft when viewed from the front. Becomes 2
The operation requires synchronous rotation of two rotary cutters, and is not applicable to muddy water types. In the case where two rotary cutters are arranged at different positions in the longitudinal direction of the excavator, a disk-type rotary cutter can be adopted as the face plate configuration, and the two rotary cutters are always operated under the same conditions. It is not necessary to perform the above operation, and the present invention can be applied to a muddy water type. However, it is an essential condition that two rotary cutters (face plates) are shifted back and forth.

In any case, in the conventional double-row shield excavator, the rotation centers of a plurality of (two) rotary cutters are located at the center of the arc forming the shield shell and a part of the adjacent rotary cutter is removed. Due to the configuration in which the excavation is performed by a full circular operation to be wrapped, when excavating a branch tunnel by using each rotary cutter individually from the middle of a double-row cross-section tunnel or combining multiple tunnels,
The range where the rotary cutter wraps (overlapping portion) is overcut.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a double row shield capable of excavating a tunnel having a high space utilization efficiency without allowing unnecessary excavating operation by a rotary cutter, enabling branching and joining of a tunnel. The purpose is to provide an excavator.

[0008]

According to a first aspect of the present invention, there is provided a shield shell having a double-row cross-sectional shape in which a plurality of cylindrical arcs are continuous, and the shield shell. Arranged at the front end, the rotation center is eccentric from the arc center of the shield shell on a line connecting the respective arc centers of the shield shell, and the outer periphery is in contact with the joining line connecting the constricted parts of the shield shell. A first rotary cutter for circular excavation;
A circular excavation is provided at the front end of the shield shell in the same plane as the first rotary cutter, with the center of rotation being the arc center of the shield shell, and the outer periphery in contact with the joint line of the shield shell constriction. A second rotary cutter to be carried out, and a tip mounted on the first rotary cutter, moving back and forth from the outer periphery of the cutter.
Is connected to the shield shell from the arc of the shield shell
Tracing a line, with an enlarged drilling cutter for enlarging the excavation of the excavation by the first rotary cutter, co forming the double row cross-sectional shape
Each rotary cutter is separated by the joint line of the shield
This is a double-row shield excavator characterized by being able to branch and join tunnels .

The second configuration is such that the enlarged excavating cutter in the first configuration is equally distributed in the circumferential direction of the first rotary cutter, and the enlarged excavating cutter can be freely moved back and forth in the radial direction of the first rotary cutter. It is a double row shield machine characterized by being supported.

A third configuration is a double-row shield excavator according to the first configuration, wherein the shield outer shell is positioned with a line connecting the centers of the respective arcs of the shield outer shell arranged vertically.

A fourth configuration is a double-row shield excavator characterized in that an auxiliary cutter is disposed in the vicinity of the junction line of the shield outer shell and the second rotary cutter in the first configuration. is there.

[0012]

In the first configuration, the first rotary cutter and the second rotary cutter perform circular excavation in a range in which the outer periphery is in contact with the constriction joining line of the shield outer shell having a double-row cross section. On the other hand, the enlarged drilling cutter moves back and forth from the outer peripheral portion of the first rotary cutter, and excavates with the first rotary cutter such that the tip thereof traces the arcuate line of the shield outer shell to the constriction joint line of the shield outer shell. Excavation of the part is performed and a double-row tunnel is excavated.

When a tunnel is branched from a double-row cross-section tunnel, excavation is continued by dividing a common shield shell having a double-row cross section by its constriction joint line. The tunnel with a straight part and the circular tunnel which are cut in the cut are excavated with less overcut.

In the second configuration, the enlarged excavating cutter is supported by the first rotary cutter, and linearly moves back and forth in the radial direction of the first rotary cutter to perform excavation. And always achieve highly reliable excavation.

In the third structure, the tunnel connecting the centers of the arcs of the shield shell is vertically set to position the shield shell, and the tunnel having a longitudinal section is excavated. Therefore, the occupied width of the tunnel in the underground can be reduced, and the underground tunnel can be reduced. Effective use is achieved.

In the fourth configuration, since the auxiliary cutter cooperatively excavates with respect to the second rotary cutter, a double-row cross-section tunnel can be excavated without any remaining area.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a double row shield machine according to the present invention.

The shield shell 1 has a double-row cross-sectional shape in which a plurality of circular arcs formed by wrapping a part of a plurality of cylinders and connecting them vertically are connected to each other.
Has a Dharma shape in which two arcs are continuous. At the front end of the shield shell 1, the rotation center O2 is eccentric from the arc center O1 of the shield shell 1 on a line connecting the respective arc centers O1 of the shield shell 1, and the shield shell 1 faces the shield shell 1. A first rotary cutter 2 for making a circular excavation with its outer periphery in contact with a joining line a connecting the constricted portion 1a, and a shield outer shell 1 for the center of rotation
The second rotary cutter 3 matched with the arc center O1 is disposed on the same plane. Each of the first rotary cutter 2 and the second rotary cutter 3 has a large number of cutter bits (not shown) mounted on a disk-shaped face plate.

Although not shown, a cutter drive mechanism for rotating the rotary cutters 2, 3 is provided in the shield shell 1 behind the first rotary cutter 2 and the second rotary cutter 3. , Two rotary cutters 2 and 3, a bulkhead separating the cutter chamber at the rear, an earth removal mechanism that penetrates the bulkhead and opens the tip to the cutter chamber,
It is equipped with a shield jack for excavation and equipment as a shield excavator similar to other prior arts.

An enlarged excavating cutter 4 is provided for the first rotary cutter 2. This enlarged drilling cutter 4
The first rotary cutter 2 moves out and retreats from the outer periphery of the first rotary cutter 2 to perform an enlarged excavation of the excavated portion by the first rotary cutter 2.
The first rotary cutter 2 is connected to a cutter driving mechanism (not shown) at the rear of the first rotary cutter 2.

In the figure, reference numeral 5 denotes an auxiliary cutter which is disposed close to the constriction joint line a of the shield shell 1 and the second rotary cutter 3, and excavates by co-excavation with the second rotary cutter 3. This is for eliminating the remaining area.

The operation of the shield machine according to the above embodiment will be described.

In excavating a double-row section tunnel, the shield shell 1 positions a line connecting the centers of the arcs of the shield shell 1 vertically. First rotary cutter 2 and second
The rotary cutter 3 performs a circular excavation in which the outer periphery is in contact with the constriction joint line a of the shield shell 1. The enlarged drilling cutter 4 mounted on the first rotary cutter 2 is the first rotary cutter 2
The first rotary cutter 2 expands and excavates the circular excavation portion within the range surrounded by the constriction joint line a of the shield outer shell 1 from the arc of the shield outer shell 1 by computer control from the outer peripheral portion. Thus, a double-row tunnel A as shown in FIG. 2 is excavated.

When the tunnel is branched from the double-row section tunnel A, the excavation is continued so that the cutters are separated at the joint line a of the common shield shell 1 having the double-row section. In this way, as shown in FIG. 3, a branch tunnel B1 with a straight portion having a straight portion (horizontal portion) at a lower portion of the circle and a circular branch tunnel B2 are excavated. When the first rotary cutter 2 is combined with a tunnel excavating mechanism including a circular shield shell, it is possible to excavate a circular branch tunnel by the first rotary cutter 2 without using the enlarged drilling cutter 3. .

FIG. 4 is a schematic front view of a double-row shield machine showing another embodiment.

The embodiment shown in FIG. 4 has the same configuration as the first rotary cutter 2 symmetrically to the first rotary cutter 2 with the second rotary cutter 3 interposed therebetween in the above embodiment. This is a triple type in which three rotary cutters 2 'are provided.

According to this excavator, the first rotary cutter
2, the second rotary cutter 3 and the third rotary cutter
2 ′ performs circular excavation in which the outer periphery is in contact with the constriction joint line a of the shield shell 1, and the enlarged excavator 4 mounted on the first rotary cutter 2 and the third rotary cutter 2 ′
(See FIG. 1). The rotary cutter 2, 2 'moves out and retreats from the outer peripheral portion of the rotary cutter 2, 2' to perform excavation of a circular excavated portion by the rotary cutter 2, 2 '.

The double-row cross-section tunnel to be excavated in this manner has a shape in which a partly cut circular tunnel in which a part of a circle is cut is connected to both sides of a general circular tonnel.
Therefore, even if the tunnel is branched, the cut portion of the partially cut circular tunnel can easily be made straight, so
Two circular tunnels can be branched from two circular tunnels, and only one linear tunnel can be branched.

Although the above embodiment has been described with reference to a case where a tunnel is branched from a double-row section tunnel, the present invention can be applied in the reverse order to combine a plurality of tunnels.

[0031]

According to the present invention constructed as described above, circular excavation is performed by the first and second rotary cutters, and a part of the circular excavation section by the first rotary cutter is enlarged by the enlarged excavator. Since the tunnel is excavated in the form of widening to excavate a double-row tunnel, even if the first rotary cutter and the second rotary cutter are arranged on the same plane, there is no interference between the cutters and a wasteful excavation operation is performed. It is possible to efficiently excavate a double-row section tunnel without any problem. In addition, since overcutting is reduced and branching and joining of the tunnel can be easily performed, a branching tunnel with high space utilization efficiency can be excavated. In addition, since a double-row cross section tunnel having a vertically long cross section is excavated, the occupied lateral width of the tunnel can be reduced, and the underground can be effectively used.

[Brief description of the drawings]

FIG. 1 is a front view of a double-row shield machine showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view of a double-row sectional tunnel.

FIG. 3 is a schematic sectional view of a branch tunnel.

FIG. 4 is a schematic sectional view of a double-row sectional tunnel showing another embodiment.

[Explanation of symbols]

 1 ... shield outer shell 1a ... constricted portion of shield outer shell 2 ... first rotary cutter O2 ... rotation center of first rotary cutter 3 ... second rotary cutter 4 ... enlarged drilling cutter 5 ... auxiliary cutter a ... outside shield Shell junction line O1 ... Center of arc of shield shell l ... Eccentricity

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Noguchi 1-3-1, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Inventor Muneo Yoshimura 1-chome Moto-Akasaka, Minato-ku, Tokyo 2-7 Kashima Construction Co., Ltd. (72) Inventor Toshio Takasaki 1-315 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd., Osaka Branch (72) Inventor Yukihiko Hizawa Awaza, Nishi-ku, Osaka City, Osaka Prefecture No. 3-15 Kashima Construction Co., Ltd., Osaka Branch (72) Inventor Yasuhiro Ueki 1-7-2 Moto Akasaka, Minato-ku, Tokyo Inside Kashima Construction Co., Ltd. (72) Inventor Toshiyuki Hayashi, Minato-ku, Tokyo JP-A-5-321587 (JP, A) JP-A-47-40828 (JP, A) JP-A-1-210597 (JP) A) (58) investigated the field (Int.Cl. ^6, DB name) E21D 9/06 301 E21D 9/08

Claims (4)

(57) [Claims] 1. A shield outer shell having a double-row cross-sectional shape in which arcs of a plurality of cylinders are continuous, and a shield provided at a front end of the shield outer shell, and having a rotation center on a line connecting each arc center of the shield outer shell. A first rotary cutter that is eccentric from the center of the arc of the shield outer shell and that makes a circular excavation by contacting the outer periphery with a joining line connecting the constricted portions of the shield outer shell, and on the same plane as the first rotary cutter. And a circular excavation which is disposed at the front end of the shield shell and has the center of rotation as the center of the arc of the shield shell and makes contact with the outer periphery of the constriction joint line of the shield shell.
And the first rotary cutter are disposed on the first rotary cutter, and move back and forth from the outer peripheral portion of the cutter to form a shield shell.
A common outer shield having a double-row cross-section is provided with an enlarged excavation cutter for tracing the constriction joint line of the shield shell from the arc wire of the first section and enlarging the excavated section with the first rotary cutter.
Each rotary cutter is separated at the joint line of the shell
A double-row shield excavator characterized by the ability to branch and combine lugs. 2. An enlarged excavating cutter is equally arranged in a circumferential direction of a first rotary cutter, and the enlarged excavating cutter is supported so as to be able to move back and forth in a radial direction of the first rotary cutter. 2. The double-row shield machine according to 1. 3. The double-row shield machine according to claim 1, wherein the shield shell is positioned with a line connecting the centers of the respective arcs of the shield shell being vertical. 4. The double-row shield excavator according to claim 1, wherein an auxiliary cutter is disposed in proximity to the joint line of the constriction of the shield shell and the second rotary cutter.