JP2740740B2 - 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 the two rotary cutters are arranged so as to be shifted in the longitudinal direction of the excavator, a disk-type rotary cutter can be used as the face plate configuration, and the two rotary cutters are always operated under the same conditions. There is no need to perform this operation, and the present invention can be applied to a muddy water type.

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 is a double-row shield capable of excavating a tunnel having a high space utilization efficiency which enables branch excavation and connection of a tunnel without unnecessary excavation operation by a cutter. 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. A plurality of rotary cutters arranged at the front end, the center of rotation of which is the arc center of the shield shell, and the outer periphery of which is in contact with a joining line connecting the constricted portions of the shield shell to perform circular excavation; and each rotary cutter. A double-row shield excavator, which is provided with a peripheral swing cutter that is disposed around and performs a ring-shaped excavation beyond a constriction joint line of a shield outer shell by reciprocating swing.

A second construction is a double-row shield excavator characterized in that a support ring is provided on the outer periphery of the rotary cutter in the first construction, and the outer periphery swing cutter is reciprocated on the support ring. is there.

In a third configuration, a notch is provided in the outer peripheral oscillating cutter corresponding to the constriction joining line of the shield shell in the first configuration, and the outer peripheral oscillating cutter is formed in an end-notched ring shape. This is a double-row shield machine.

A fourth configuration is characterized in that a large number of cutter bits are attached to both end frame members forming the cutout portions of the outer peripheral swing cutter in the first configuration from the front surface to the side surfaces. This is a double-row shield excavator.

A fifth configuration is a double row shield excavator according to the first configuration, wherein a line connecting the centers of the respective arcs of the shield shell is vertically set to position the shield shell.

A sixth configuration is a double-row shield excavator characterized in that the rotary cutter in the first configuration can be combined with a circular tunnel excavation mechanism during the excavation of a double-row section tunnel.

[0014]

In the first configuration, the rotary cutter performs a circular excavation in a range in which the outer periphery is in contact with the constriction joining line of the shield shell having a double-row cross section. On the other hand, the outer peripheral swing cutter swings reciprocally around the rotary cutter to perform ring-shaped excavation beyond the constriction joint line of the shield shell to excavate a double-row tunnel. When branching a tunnel from a double-row section type tunnel, unnecessary overcut can be reduced by performing a partial ring-shaped excavation within a range where the outer peripheral swing cutter does not exceed the constriction joint line.

In the second configuration, since the outer peripheral swing cutter reciprocates on the support ring provided on the outer periphery of the rotary cutter, the outer peripheral swing cutter is securely held and operates smoothly.

In the third configuration, the outer peripheral oscillating cutter is formed in the shape of a notched ring, and the adjacent outer peripheral oscillating cutters alternately perform ring-shaped excavation beyond the constriction joining line of the shield shell. Thus, excavation without unnecessary excavation operation is realized.

In the fourth configuration, since a large number of cutter bits are attached to both end frame members of the outer peripheral swing cutter from the front surface to the side surfaces thereof, the excavation performance is the same as that of the spoke type cutter. Demonstrate. In addition, when branching and excavating a tunnel in the middle of excavation of a double-row cross section tunnel, the excavation swing range of the outer peripheral swing cutter is limited, so that a branch tunnel having a flat lower or upper portion and high space utilization efficiency can be excavated.

In the fifth configuration, since the shield shell is positioned with the line connecting the centers of the arcs of the shield shell being vertical and the tunnel having a longitudinal section is excavated, 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 sixth configuration, a circular branch tunnel with high drilling efficiency can be drilled by combining a circular tunnel drilling mechanism with each rotary cutter when branching the tunnel while the double-row section tunnel is being drilled. Can be easily branched and joined.

[0020]

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 the arcs of two cylinders are continuous. At the front end of this shield shell 1, there is a shield shell 1
The two rotary cutters 2 that perform circular excavation with the circular arc center O1 as the center of rotation and the outer periphery thereof is in contact with the joining line a connecting the constricted portions 1a of the shield shell 1 are arranged on the same plane.

The basic structure of the rotary cutter 2 is the same as that of the prior art, and a number of cutter bits (not shown) are mounted on a disk-shaped face plate.

Although not shown, the rotary cutter
2 behind the shield shell 1
2, a cutter drive mechanism for rotating the rotating cutter 2, a bulkhead provided at the rear part of the cutter chamber to partition the cutter chamber, an earth discharging mechanism penetrating the bulkhead and opening the tip to the cutter chamber, a shield jack for excavation, and other conventional techniques. A similar shield machine is provided.

Rotary cutter 2 Circumferential swing cutter 3
Is arranged. This outer peripheral swing cutter 3 reciprocates and performs a ring-shaped excavation beyond the constriction joint line a of the shield shell 1 and is reciprocally swingable on a support ring 4 provided on the outer periphery of the rotary cutter 2. Although not shown, it is connected to a reciprocating swing drive mechanism disposed in the shield shell 1 behind the rotary cutter 2. The outer peripheral swing cutter 3 is formed in an end-notched ring shape by providing a notch 5 corresponding to the constriction joining line a of the shield shell 1, and a number of cutter bits (not shown) are provided on the face plate thereof. A plurality of cutter bits (not shown) are attached to the end frame member 6 which forms the notch 5 of the outer peripheral swing cutter 3 from the front surface to the side of the notch 5 side. I have.

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

In excavating a double-row tunnel, the shield shell 1 positions a line connecting the centers of the arcs of the shield shell 1 vertically. The two rotary cutters 2 perform circular excavation in which the outer periphery is in contact with the constriction joint line a of the shield shell 1.
The outer peripheral swinging cutter 3 mounted around both rotating cutters 2 reciprocates around the rotating cutter 2 and alternately shields the outer shell.
Excavate the ring-shaped excavation beyond the constriction joint line a. That is, as shown in FIGS. 2 (a) and 2 (b), both ends of two outer peripheral swing cutters 3 formed in an end-notched ring shape alternately enter and exit the notch portion 5 which is fitted. The ring-shaped excavation is performed by abutting the ends of the outer peripheral swing cutter 3 in the notch 5. Thus, a double-row tunnel A as shown in FIG. 3 is excavated.

When the rotary cutter 2 and the outer peripheral swing cutter 3 are united to branch off the tunnel from the double-row section tunnel A, the two rotary cutters 2 are used to perform circular excavation as they are, and the outer peripheral swing cutter 3 is A partial ring-shaped excavation is performed within a range not exceeding the constriction joint line a of the shield shell 1. That is, as shown in FIGS. 4 (a) and 4 (b), the two reciprocating rocking cutters 3 formed in the shape of a notched ring are reciprocally rocked within a range in which both end portions do not come into and out of the notched portion 5 which is fitted. Then, a partial ring-shaped excavation is performed. Thus, as shown in FIG. 5, a branch tunnel B having a horizontal portion at the top or bottom of the circle is excavated.

Also, without using the outer peripheral swing cutter 3,
When branching a tunnel from the double-row section tunnel A with the rotary cutter 2, a general circular branch tunnel is excavated by combining the rotary cutter 2 with a tunnel excavation mechanism including a circular shield outer shell. .

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

[0031]

According to the present invention constructed as described above, a plurality of rotary cutters are used to perform circular excavation in which the outer periphery is in contact, and a ring-shaped excavation is performed in such a manner that the circular excavation portion is widened using an outer peripheral swing cutter. In this way, in the range where the outer peripheral swing cutter wraps, mutual excavation is eliminated by excavation that alternately enters and exits, unnecessary operation can be eliminated, and a double-row section tunnel can be excavated efficiently. In addition, overcutting is reduced, and branching and joining of the tunnel can be easily performed, so that a branch tunnel with high space utilization efficiency can be excavated.
In addition, since a double-row 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.

FIGS. 2 (a) and 2 (b) are explanatory views of the operation of excavating a double-row tunnel.

FIG. 3 is a schematic sectional view of a double-row sectional tunnel.

FIGS. 4A and 4B are explanatory diagrams of an operation of excavating a branch tunnel.

FIG. 5 is a schematic sectional view of a branch tunnel.

[Explanation of symbols]

 1… Shield outer shell 2… Rotating cutter 3… Operating swing cutter O1… Center of arc of shield outer shell

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 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. No. 15 Kashima Construction Co., Ltd., Osaka Branch (72) Asahi Hashimoto 1-7-2 Moto Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Satoshi Manabe 1-2, Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd. (56) References JP-A-5-321587 (JP, A) JP-A-3-206293 (JP, A) JP-A-1-210597 (JP, A) JP-A-2 −304198 (JP, A)

Claims (6)

(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 disposed at a front end of the shield outer shell, the center of rotation of the shield outer shell being a center of rotation, and
A plurality of rotary cutters that make a circular excavation by touching the outer circumference to the joint line that connects the opposing constrictions of the shield shell, and are arranged around each rotary cutter, and swing back and forth to form a joint line for the shield shell constriction. A double-row shield excavator comprising an outer swinging cutter for excavating a ring. 2. The double row shield excavator according to claim 1, wherein a support ring is provided on the outer periphery of the rotary cutter, and the outer peripheral swing cutter is reciprocated on the support ring. 3. A notch portion is provided in the outer peripheral oscillating cutter corresponding to the joint line of the constricted portion of the shield outer shell, and the outer peripheral oscillating cutter is formed in an end-notched ring shape.
Double-row shield machine described in 1. 4. The double row mold according to claim 1, wherein a number of cutter bits are attached to the end frame member forming the cutout portion of the outer peripheral swing cutter from the front surface to the side surface. Shield machine. 5. The double-row shield excavator according to claim 1, wherein the shield shell is positioned with a vertical line connecting the centers of the respective arcs of the shield shell. 6. The double-row shield excavator according to claim 1, wherein a rotary tunnel excavation mechanism can be combined with the rotary cutter during the excavation of the double-row section tunnel.