JP3357605B2 - Magnifying 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 an enlarged shield machine capable of widening a required section of a tunnel with a single machine.

[0002]

2. Description of the Related Art Generally, in the construction work of a tunnel, a tunnel excavator having a disk-shaped cutter head in front of a cylindrical skin plate is used to excavate while rotating the cutter head. It is designed to excavate a tunnel of approximately the same diameter.

Recently, with the expansion of the range of use of tunnels, for example, when a subway station building or the like is installed, it becomes necessary to widen and excavate a required portion of a circular cross-section tunnel into, for example, an elliptical cross-section. I have. In such a case, conventionally, by using an enlarged shield excavator that excavates in a ring along the outer peripheral surface of the primary segment while dismantling and removing the lining primary segment, the diameter of the primary segment is larger than that of the primary segment. A construction method is adopted to build a secondary segment.

[0004] However, in such a construction method, the widening work is limited after the construction of the primary tunnel, and ground improvement is required when constructing a starting base of the enlarged shield machine, and the work is extremely difficult. There is a problem of inefficiency.

To cope with such a problem, Japanese Patent Application Laid-Open No. 58-213996 discloses a method in which a cover is provided on the outer peripheral side of a cylindrical shield frame, and the cover is moved in a radial direction to shield the shield. There has been proposed a shield machine in which a diameter of a frame is enlarged and an excavation section is made variable by projecting an over cutter from a cutter face plate.

As another prior art related to the present invention, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 10-77781. In this publication, for example, to excavate a tunnel used as a subway, the first excavator body is advanced while driving and rotating a circular first cutter head,
In addition, the first tunnel is constructed by assembling the segments in a ring shape, while the second excavator body is advanced while reciprocatingly swinging the non-circular second cutter head, and does not contact the ring-shaped segment. A tunnel excavator has been proposed in which a second tunnel is constructed by assembling a segment into a part.

[0007]

However, in the former publication (Japanese Patent Application Laid-Open No. 58-213996), the front surface of the cutter head and the ground in the radial direction in the widening section are excavated only by the over cutter. Therefore, there is a problem that the efficiency of the excavation work in the widened section cannot be reduced. Further, in the one described in this publication, it is necessary to control the amount of protrusion of the overcutter according to the rotation angle of the cutter face plate in order to excavate an elliptical cross section, and not only the mechanism is complicated, but also the overcutter There is also a problem that a control device for taking in and out is separately required, which complicates the device configuration.

In the latter publication (Japanese Unexamined Patent Publication No. Hei 10-77781), which is cited as a prior art related to the present invention, a tunnel having an irregular cross-sectional shape in which a first tunnel and a second tunnel are connected is disclosed. It is intended to excavate, and cannot be adapted to the use of forming a widened portion in the middle of an excavation section as in the present invention.

The present invention has been made in order to solve such problems, and a single tunnel excavator can efficiently perform construction of a primary tunnel and widening work.
It is an object of the present invention to provide an enlarged shield machine capable of shortening the construction period and reducing the construction cost.

[0010]

In order to achieve the above-mentioned object, an enlarged shield machine according to the present invention comprises: (a) a first machine having a first cutter head at a front end; A second excavator built in the main body of the first excavator and having a second cutter head at its front end reciprocally oscillated within a predetermined angle range; and (c) the second excavator is connected to the first excavator. And a retracting means for retracting from the main body in a direction orthogonal to the excavation direction.

In the enlarged shield machine according to the present invention, when a primary tunnel having a normal circular cross section is excavated, the second machine is housed in the first machine, and in this state, the first machine is used. Excavation of a circular section tunnel is performed by rotating the first cutter head at the front end. Also, when approaching the widening section during the excavation of the primary tunnel, the second excavator is protruded from the side of the first excavator main body by the operation of the excavating / retracting means, and the protruding portion is located on the front of the second excavator. Sediment is excavated by reciprocating swinging of the second cutter head at the front end of the second excavator. Thus,
In the widening work section, the ground is excavated by driving both the first cutter head and the second cutter head, thereby excavating a tunnel having an irregular cross section such as an oval cross section. When returning to the excavation of the circular section tunnel after the widening section has been completed,
The second excavator that is also protruding by the operation of the retracting means is stored in the first excavator body. According to the present invention, the second excavator housed in the first excavator main body is moved to the first excavator.
The excavation of the primary tunnel construction section and the widening construction section can be performed by one excavator by operating the excavator to the side of the excavator body, so that the construction period can be shortened. Since no ground improvement is required, the construction cost can be reduced. Furthermore, in this widening section, since the ground is excavated by the second cutter head at the front end of the second excavator, it is possible to avoid occurrence of a situation in which the excavating work efficiency is reduced in this widening section. it can. In addition, since this widening and reduction can be performed at any place and section, it can be said that this is an expanded shield machine having a wide applicable range.

In the present invention, the tail seal of the first excavator and the tail seal of the second excavator are provided in the second excavator.
It is preferable that the excavator be provided so as to overlap with each other in the direction of the excavation in a range longer than the length of the excavator. By adopting such a configuration, even if the second excavator protrudes to the side of the first excavator main body, the tail seals of both excavators are in an overlapping state with each other. The sealing action of the tail is not impaired.

In the present invention, one of the first excavator and the second excavator is provided with an overcutter device for excavating the ground around the protruding portion before the second excavator protrudes. Is preferred. With this configuration, when the second excavator is protruding, the ground on the side can be excavated by the over cutter device to secure a space for protruding the second excavator.

Further, the first excavator has a cylindrical skin.
Notch for accommodating the second excavator on a part of the side of the plate
Part, and the front of this notch is
A substantially semi-circular first partition wall provided continuously;
The side of the section is a rectangular second section connected to the first partition.
Separation from the cabin space of the first excavator by partition walls
Is configured, the second excavator is the outer circumferential surface arc surface shape
Skin plate and the inner surface is
Covered by a rectangular partition wall connected to the skin plate
On the skin plate of the first excavator
A flat slide piece is provided at the end and the lower end,
At the position facing these slide pieces, the second excavation
A flat slide piece is provided on the machine's skin plate.
And the front ends of the slide pieces of the second machine
And connected to the bulkhead of the second machine.
So that a continuous member is provided in front of the second cutter head.
And the slides of the first excavator facing each other
Between the piece and the slide piece of the second machine, and
It is preferable that a seal member that slides when the second excavator projects is provided between the installation piece and the first partition . This makes it possible to reliably prevent earth and sand and water from entering the inside of the machine, even if the second excavator is operated on the first machine.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of an enlarged shield machine according to the present invention will be described with reference to the drawings.

FIG. 1 is an overall schematic perspective view of an enlarged shield machine according to one embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG. is there.

The enlarged shield machine 1 of the present embodiment has a first
It comprises an excavator 2 and a second excavator 3 which is built in the main body of the first excavator 2 and which can be moved in and out of the first excavator main body.

The first excavator 2 has a front body 5 having a cylindrical skin plate 5a rotatably supporting a disk-shaped first cutter head 4 at a front end thereof. The rear body 7 is formed by forming a cutout 6 for accommodating the second excavator 3 in a part of the side of a cylindrical skin plate 7a that is freely bendable. Here, this notch 6
A first semi-circular partition wall 8 having a front portion connected to the skin plate 7a and arranged in a direction perpendicular to the tunnel axis;
And a rectangular second partition wall 9 whose side portion is connected to the first partition wall 8 and is arranged in the tunnel axis direction.
Each is formed by partitioning from the internal space of the first excavator 2. The first excavator 2 excavates the ground at the front by rotating and driving the first cutter head 4 by the cutter head driving motor 10.

On the other hand, the second excavator 3 has a front end portion in which a second cutter head 11 having a shape in which a part of a disk is notched is supported so as to be reciprocally swingable, and the second cutter head 11 is provided with a hydraulic jack. Alternatively, it is configured to excavate the ground in front of the second cutter head 11 by being reciprocally rocked within a predetermined angle range by a rocking drive mechanism 12 such as a forward / reverse rotation motor. Here, the rotation center axis of the first cutter head 4 of the first excavator 2 and the swing center axis of the second cutter head 11 of the second excavator 3 are made to coincide.
Further, an over cutter 13 is mounted on the outer peripheral portion of the second cutter head 11 so as to be able to protrude and retract, and when the second excavator 3 protrudes to the side of the first excavator 2, the over cutter 13 Excavation of the ground has been performed.

The second excavator 3 has a rectangular partition wall 15 whose outer peripheral surface is covered by an arc-shaped skin plate 14 and whose inner surface is connected to the skin plate 14 and faces the second partition 9. And has a substantially semi-cylindrical shape as a whole. Here, the curvature of the skin plate 14 is made equal to the curvature of the skin plate 7a, so that when the second excavator 3 is housed in the first excavator 2, both skin plates 7a, 14 is a continuous curved surface with no steps.

Hydraulic jacks 16 are mounted on the second partition 9 as projection means, and the rod ends of these hydraulic jacks 16 are fixed to the partition 15 on the second excavator 3 side, so that the hydraulic jack 16 Second excavator 3 by telescopic operation
Can be made to appear sideways with respect to the first excavator 2.

In order to smoothly move the second excavator 3 in and out, the upper and lower ends of the skin plate 7a are provided with plate-like slide pieces 17 and 18, respectively. At the position facing the pieces 17 and 18, the flat plate-shaped slide piece 1 is also placed on the skin plate 14.
9 and 20 are provided. Also, the front ends of the slide pieces 19 and 20 on the second excavator 3 side are connected to each other,
A connecting piece 21 is provided in front of the second cutter head 11 so as to be connected to the partition 15.
And between the slide piece 17 and the slide piece 19,
Between the connecting piece 21 and the first partition 8 and the slide piece 1
8 and the slide piece 20, the seal member 22 (slide piece 1) is held on the second excavator 3 side.
A sealing member (not shown) between 7, 19 and between the slide pieces 18, 20 is inserted. Thus,
Even if the second excavator 3 is operated sideways with respect to the first excavator 2, earth and water, water, and the like are prevented from entering the inside of the machine from between the sliding surfaces of the two.

On the other hand, as shown in FIG. 3, in the first excavator 2, a shield jack 23 is arranged along the inner peripheral surface of the skin plate 7a of the rear trunk portion 7, and the second excavator 2 In 3, a shield jack 24 is arranged along the inner peripheral surface of the skin plate 14.

As shown in FIG. 2, a tongue piece 25 is attached to the rear end of the skin plate 7a of the first excavator 2.
Are integrally formed. This tongue piece 25 is the second excavator 3
The second excavator 3 is extended so as to cover the rear end face of the second excavating machine 3 in the extending direction in the range of not less than the sliding length (extending and retracting length), and a tail seal 26 is attached to the inner peripheral surface thereof. With such a configuration, even when the second excavator 3 protrudes laterally from the inside of the first excavator 2, the tail seal 26 of the first excavator 2 overlaps with the tail seal 27 of the second excavator 3. And the first excavator 2 and the second excavator 3
The sealing action of the tail of the vehicle is not impaired.

The enlarged shield machine 1 constructed as described above.
The operation of will be described below.

First, when excavating a normal circular section tunnel, as shown in FIG. 2, the second excavator 3 is housed in the first excavator 2 and the cutter head driving motor 10 When the shield jacks 23 and 24 are extended while rotating the first cutter head 4 at, the first excavator 2 and the second excavator 3 obtain a reaction force on the segment 28 (see FIG. 4) and excavate. A tunnel of standard cross section (circular cross section) is constructed. During excavation of the circular section tunnel, the second cutter head 11 is not driven to swing. Excavated earth and sand taken into the machine by the rotation of the first cutter head 4 is carried out to the rear of the tunnel by a not-shown mud pipe or the like.

Next, when the construction of the widening tunnel is started, the second cutter head 11 is reciprocally oscillated by the oscillating drive mechanism 12 while the first cutter head 4 is rotationally driven, and the over cutter 13 is projected. Then, the ground on the side of the second machine 3 is excavated by the over cutter 13,
At the same time, the hydraulic jack 16 is operated in the extension direction to cause the second excavator 3 to protrude laterally with respect to the first excavator 2. Also,
By extending the shield jacks 23 and 24 in accordance with these operations, the first excavator 2 and the second excavator 3 are advanced. In this way, the second excavator 3 is gradually extruded laterally from the inside of the first excavator 2 by securing the protruding space by excavating the ground on the side by the over cutter 13. In addition, the ground in front of the second cutter head 11 is excavated by the reciprocating swing of the second cutter head 11 with the protrusion of the second excavator 3, so that the second excavator 3 The excavation section on the protruding side will be gradually widened. On the protruding side of the second machine 3, a tapered segment 29 is wound up as shown in FIG.

Next, after the second excavator 3 has protruded by the required amount of protrusion, the overcutter 13 is returned to its original position, and the rotation of the first cutter head 4 and the swing of the second cutter head 11 are performed. Excavation of the wide tunnel (see FIG. 4A) having an oval cross section is performed by dynamic driving. In addition,
When returning to the excavation of the circular section tunnel after the widening section is completed, the hydraulic jack 16 is operated to store the projecting second excavator 3 in the first excavator 2.

In this embodiment, even if the second excavator 3 moves to the projecting position, the sliding surface between the first excavator 2 and the second excavator 3 is reliably sealed by the seal member 22, and The tail seal 26 of the first excavator 2 and the tail seal 27 of the second excavator 3 are arranged so as to overlap each other in a range that is longer than the length of the second excavator 3, and their tail portions are also securely sealed. So that earth and sand, water and the like do not enter the cabin.

According to the enlarged shield machine 1 of this embodiment, the excavation of the primary tunnel construction section and the widening construction section can be performed by one machine, so that the construction period can be shortened and the construction period can be shortened. Since the ground improvement is not required at the time of widening and shrinking, it is possible to reduce the construction cost, and it is possible to effectively perform the excavation work in the widening section. Also,
There is also an advantage that the widening and reduction of the tunnel can be performed at any place or section.

In this embodiment, the over cutter for excavating the ground on the side is provided on the second excavator 3 side, but this over cutter is provided on the first excavator 2 side. You may do it.

[Brief description of the drawings]

FIG. 1 is an overall schematic perspective view of an enlarged shield machine according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4 is an explanatory view showing a segment shape obtained by widening excavation, where (a) is a view showing a cross section after widening,
(B) is a sectional view showing a widening mode, and (c) is a view showing a standard section.

[Description of Signs] 1 Enlarged shield excavator 2 First excavator 3 Second excavator 4 First cutter head 6 Notch 8 First partition 9 Second partition 11 Second cutter head 13 Over cutter 15 Partition 16 Hydraulic jack ( 17, 18, 19, 20 Slide part 21 Continuous part 22 Seal member 25 Tongue 26, 27 Tail seal 28, 29 Segment

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Mitani 2-3-6 Akasaka, Minato-ku, Tokyo Komatsu Ltd. Headquarters (72) Inventor Mitsuyuki Iwakiri 2-3-6 Akasaka, Minato-ku, Tokyo Komatsu Ltd. Head Office (56) References JP-A-2-210194 (JP, A) JP-A-6-146775 (JP, A)

Claims (4)

(57) [Claims] (A) a first excavator having a first cutter head at a front end thereof; and (b) a built-in main body of the first excavator, which is reciprocally rocked at a front end within a predetermined angle range. A second excavator having a second cutter head; and (c) a magnifying shield excavator comprising: an excavating / retracting means for causing the second excavator to protrude and emerge from a main body of the first excavator in a direction orthogonal to the excavation direction. . 2. A tail seal of the first excavator and a tail seal of the second excavator are provided so as to overlap with each other in a protruding and retracting direction within a range not less than a protruding and retracting length of the second excavating machine. An enlarged shield machine according to claim 1. 3. An overcutter device is provided on one of the first excavator and the second excavator for excavating the ground around the protruding portion before the second excavator protrudes. 3. The enlarged shield machine according to 1 or 2. 4. The first excavator includes a cylindrical skin press.
A notch for storing the second excavator in a part of the side of the
The front of this notch is connected to the skin plate
The first partition having a substantially semicircular shape,
A rectangular second partition having a side portion connected to the first partition.
Is separated from the space inside the first excavator by
Configured Te, the second excavator is arc surface shape of the skin plate outer peripheral surface
Is covered with a skin plate on the inside
The first excavator is configured so as to be covered with a rectangular partition wall , the upper end portion and the lower end portion of the skin plate of the first excavator.
Is provided with a plate-shaped slide part, and these slide parts
At the position facing the piece, the skin play of the second machine
A flat slide piece is provided on the
So as to connect the front ends of the slide pieces of the advance machine,
And the second excavator so as to be connected to the partition wall of the second excavator.
A connecting member is provided in front of the two-cutter head, and the sliding piece of the first excavator and the second
Between the slide part of the engine and the connecting part and the
The enlarged shield machine according to any one of claims 1 to 3, wherein a seal member that slides when the second machine is projected is provided between the shield machine and the first partition .