JPH11141274A - Creased device in tunnel excavating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the function by arranging an elastic seal member between excavating device body cylindrical parts of a creased part bent according to a curved part to be excavated. SOLUTION: An elastic seal member 45 formed of, for example, substantially U-shaped elastic members 450, 451 of rubber is installed to the joint of cylindrical parts 10. The member 450 prevents the penetration of water by hydraulic pressure and sediment by earth pressure, the member 451 has a strength such that it is never recessed even if the member 450 is pressed into an advancing unit, and a compressed air injection port 452 is provided between the members 450, 451. In excavation of a curved part, a compressed air is charged through the injection port 452 while a direction correcting jack 40 situated on the outside of the curved part to be excavated, and after the construction of the curved part, the jack 40 is contracted and returned to the linear state while releasing the compressed air. Thus, even a sharply curved part can be constructed, this device is applicable even if the excavating radius is small, the cost can be reduced, and the replacement, when an excavating device is partially replaced, can be extremely easily performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center folding device applied to a tunnel digging device for electric power, sewage, telephone, and the like.

[0002]

2. Description of the Related Art Conventionally, small cross-section tunnels for electric power, sewage, telephones, etc. are not cut in place of open cuts because of cost reduction, shortening of construction period, traffic measures, and measures such as noise and vibration for residents along the road. The propulsion method, which is a construction method, is often used. For a sharp curve or a long-distance construction, a shield construction method is employed in which a segment is assembled in a shield machine, the segment is pressed by a jack, and the segment is advanced by a reaction force.

[0003] Further, in the apparatus for carrying out these methods, there is provided a half-folding device which is a bent portion of a cylinder which bends according to the curved portion in a cylindrical portion of the propulsion device in a curved portion of excavation.

As a structure of a conventional half-folding apparatus, as shown in FIG. 9, an end portion of a circular pipe is joined to a curved surface, and an annular curved portion having a circular cross section is formed into a circular tube. There is a method in which the steel seams of the circular pipe and the circular pipe are parallel-plane joined in section and are fitted into each other as shown in 2 in FIG. Was also a pipe joint.

[0005]

Conventionally, in a drilling device, a propulsion device and the like have been collected and reused after excavation as much as possible. There was also a problem in terms of cost.

This is because the excavator itself has a problem in cost. For example, in the processing of a curved portion, the cylindrical portion of the excavator is provided with a middle bent portion that bends in a snake shape in accordance with the curved portion of the ground, but the configuration thereof is an iron joint between a circular pipe and a circular pipe. In this case, the structure is difficult to process and the manufacturing cost is high, and the bending ability is inferior. In particular, when the portion to be excavated is a sharply curved portion, it is difficult and difficult to cope with the conventional device.

[0007] In the conventional structure, as shown in FIG. 9, circular pipes are provided with curved portions each having a circular cross section and joined together.
Since the curved surface joint 8 is used, the precision must be increased in order to prevent intrusion of earth and sand or water. Therefore, processing precision is required, processing is difficult, and the manufacturing cost is increased.
The bending ability was not so favorable due to its accuracy.

[0008] Further, as shown in 2 of Fig. 9, there is a type in which an iron seam between a circular pipe and a circular pipe is set in a fitting type. In this case, not only accuracy is required in the cutting process, but also Because of the fitting of the parallel plane joint 9, it is not preferable that the excavator itself bends in the excavation curved portion with a small curved portion.

Therefore, in FIG. 9-2, when a circular tube is bent, it is difficult and difficult to bend. In the case of FIG. 9 (1), the inner circumference of the circular pipe must be cut into a curved surface, which is a very large object to be machined, and the machining accuracy must be increased. I was

Further, in order to prevent groundwater from flowing into the apparatus, it is difficult in the above-mentioned conventional configuration because of the so-called relationship between bending and sealing, and its use has been skipped particularly in a large bent portion.

Further, in the above-described bent-in structure, the device cannot be easily detached because a part of the device is simply replaced or a process requiring high accuracy is required. Replacement was difficult in some cases. Therefore, there are many cases in which many are left without being reused, or are buried underground and abandoned in spite of high manufacturing costs.

Further, in the curved portion of the ground, it is difficult to use the curved portion of the ground in a sharp curved portion because of the structure, it is difficult to cope with the curved portion.

Therefore, according to the present invention, the center folding device has a simple structure, and its manufacture is easy, and repair and replacement can be performed easily and quickly, and it is particularly convenient for reuse with the used device. The purpose is to gain.

According to the present invention, the conventional drilling rig is not reused due to the above-mentioned reasons, and in view of the fact that many are left, it can be reused, and can be mounted very easily and quickly. It is an object of the present invention to obtain a structure of a center folding device which can be exchanged, can be applied to a sharp curve portion of excavation, and is inexpensive.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a center folding device of a tunnel digging device for digging a tunnel for electric power, sewage, telephone, or the like according to the present invention is provided with a digging device in a main body cylindrical portion of the device. In the middle bent portion between the cylinders that bend corresponding to the curved portion, the space between the cylinders at the middle bent portion is formed by an elastic sealing member.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings.

FIG. 1 shows a center folding device in a propulsion device 1 for performing a propulsion method, which is a tunnel excavation device of the present invention.

At the front of the propulsion device 1, a cutting portion 2 provided with a cutter is provided. At the time of the propulsion method, the ground is cut by the cutting portion 2 as usual, and at the same time the earth and sand is removed from the earth and sand discharge device. 5 will be postponed. Then, the propulsion fume tube is pushed by an original pushing mug or the like (not shown), and the cylinder 10 is pushed forward to move forward.

If the excavation part is a curved part, the excavator is required to bend according to the curved part. The excavator is provided with a center folding device 4 for the propulsion device or the shield device for this purpose, and the center folding device 4 allows the cylinder 10 to bend in a snake shape according to the bent portion.

Similarly, in the shield device for performing the shield method, the center folding device 4 is provided, and the device itself is formed to bend at a curved portion to be excavated.

The rear part of the shield device is generally provided with a segment assembling device for assembling segments, a support device for fixing the assembling device in the shield device, a segment pressed by a shield jack, and the like.

As described above, the center folding device is provided in both the propulsion device and the shield device. However, since the portion provided with the device is located between the cylinders of the excavator, the center folding device is provided. When the device is removed, it can be seen that the device can be replaced or repaired from that portion.

Normally, the portion including the front cutting portion 2 is reused in the propulsion device, so the first-stage half-folding device 4 is removed from the front, and the rear portion is supplied as a new portion. You.

The center folding device 4 is usually provided at two places at the joint portion between the cylindrical portions 10 and 10, but can be installed as necessary. In a gentle curved part, the number of joints can be reduced as compared with a case where a sharply curved part is excavated.

As shown in FIGS. 2 to 8, the center folding device of the excavator according to the present invention shows each embodiment.

When the turn of the tunnel is reached, outside of the turn, the shaft 402 of the direction correcting jack 40 is driven to expand the seam between the cylinders 10, 10 as shown in FIG. On the other hand, inside the bent portion, the shaft 402 of the direction correcting jack 40 is not driven but closed. The operation of the half-folding device 4 will be described in detail below.

A tension bolt 43 is provided on the cylinder 10.
It is appropriately provided at several places on the inner circumference to keep the joint between the cylinders 10. The tension bolt 43 is removed on the extension side when the extension is performed.

Further, in the half-folding device 4, since the circular pipes are connected to each other, the structure including the elastic sealing member of the half-folding device 4 of the present invention can be easily formed from the portion according to the fatigue of the device 1 or the like. Can be exchanged. Therefore, as a replaceable configuration, in addition to the conventional joint portion 11, these half-folding devices 4 are also possible.

The cylinder 10 and the cylinder 10 are rotatably connected by a direction correcting jack 40. The jack 40 includes a cylinder portion 401 and a sliding shaft 402 driven in the cylinder portion 401 by hydraulic pressure or the like. The shaft 402 is attached to the attachment 41, and the cylinder portion 401 is attached to the attachment 42. Rotating shaft 410, 4
20 is rotatably mounted.

An elastic sealing member 45 is provided at a joint between the cylinders 10 and 10. In this embodiment, the elastic sealing members 45 are elastic members 450 and 451.
Is provided. Each elastic member is made of a rubber-like member, has a substantially U-shaped cross section, and can be expanded when the cylinder is bent.

The elastic member 450 and the elastic member 451 are fixed to the support members 453, 453 by appropriate fixing means such as bolts. Further, the support members 453, 453 can also be attached to the attachments 41, 42, respectively, and in that case, the trouble of attaching to the circular tubes 10, 10 can be saved.

The fittings 41, 42 may be attached to the circular tubes 10, 10 by generally providing a stay and bolting.
In this case, it becomes detachable.

Also, a welding structure may be used for fixing,
In this case, it is blown off for removal.

The outer elastic member 450 is mainly for preventing intrusion of earth and sand from water or earth pressure caused by water pressure.
As shown in FIG. 3, it can be seen that water and earth and sand do not enter when the elastic member is expanded.

The inner elastic member 451 is preferably configured to have sufficient strength so that the outer elastic member 450 is not pushed into the propulsion device 1 by earth pressure and is not dented.

An injection port 452 into which compressed air is injected is provided between the two elastic members to provide elasticity.
Then, since it expands by compressed air, invasion of earth and sand, water, etc. can be effectively prevented.

The center folding device may have various other structures.

FIG. 3 shows the center folding device 4 at the corner of the excavation part.
The state of operation is shown in FIG. 3. The procedure of the bending is described below. First, as shown in FIG.
Remove the tension bolt 43 outside the curved portion on the ground or the like on the side to be extended by zero.

Without removing one of the tension bolts 43 on the so-called non-expanding side, the tension bolts 4 in the opposite direction are not removed.
Remove 3 However, it has a play that can slide a little against bending.

Next, the direction correcting jack 40 is used for the center bending.
Is operated to extend the shaft 402. Then, compressed air is injected from the injection port 452 while the shaft 402 of the jack 40 is extended. Now that the preparation is completed, the construction on the curved portion is started, and after completion, the direction correcting jack 40 is contracted while extracting compressed air to return to a straight line.
In other embodiments, the operation is the same except for compressed air.

FIG. 4 shows another embodiment of the center folding device 4.
0 seals between the cylinders 10 around the circumference. The elastic flexible member 460 has a bellows shape, and is elastic. The bellows-like elastic member 460 is
A reinforcement ring 462 is embedded within the flexible member 460 to maintain its shape. As shown in FIG. 5, when the member 460 expands and contracts, the member 460 gradually expands to prevent infiltration of earth and sand or water.

FIG. 6 shows another embodiment of the folding device 4, in which a water-stopping elastic member 470 made of rubber or the like and a strip-shaped flexible plate 475 are used as the elastic sealing member 47. Be composed. The water-stopping elastic member 470 includes a hollow annular elastic member having a convex shape, such as rubber, housed in the groove 471 with the elastic force of air, and is pressed against the plate 475 to seal it.

As shown in FIG.
The outer cover portion 476 is made of rubber or the like, and a plate member 477 is provided on the inner peripheral side. The plate member 477 includes
A reinforcing ring 478 is attached, is integrally embedded and stretched, and assists the close contact with the water-stopping elastic member 470. Although the plate 475 is attached to the cylinder 10, a spring plate 479 may be embedded at the end thereof for reinforcement.

FIG. 8 shows another embodiment of the center folding device 4, in which the elastic sealing member 48 has an inclined cross section with respect to the water-stopping elastic member 470 made of rubber or the like shown in FIG. The plate 480 is pressed and sealed. When the cylinder bends at the bend of the tunnel, a plate 48 with an inclined section
0 is on the water stop elastic member 470 having the elastic force of air,
It slides while being pressed and can maintain a sealed state. The cross-sectional shape of the plate 480 may be a curved shape, as long as it slides while maintaining the pressure contact when the cylinder 10 is bent, in addition to an inclined shape. The material may be an elastic member or a rigid metal such as iron.

The water-stopping elastic member 470 is, for example,
It is also possible to use a plate material having a cross section such as rubber, and the plate material is inclined and pressed against the plate 480, followed by pressure bonding (not shown).

The plate 480 has a stopper 481 at an end thereof, and engages with a closing member 490 provided on the inner wall of the circular tube on the side of the water-stopping elastic member 470 to limit the opening / closing angle. You can also.

As described above, the center folding device of the present invention can be easily attached without processing into a circular pipe.

In particular, in order to provide the elastic sealing member in a propulsion machine or a shield machine having a conventional center folding device, the tubes can be aligned and attached by a fusing machine.

As shown in FIG. 9, the surfaces of the cylinders 10 and 10 are joined by fusing along the line aa, and the elastic sealing member 4 is attached thereto.

[0050]

The present invention has the following advantages as a result of the configuration described above.

With the center folding device of the present invention, whether it is a propulsion device or a shield device, the excavation can be bent correspondingly even in a sharply curved portion, and the excavation can be performed.

According to the present invention, even a small excavation radius, for example, a radius of 50 m or less can be achieved.

In the machining of the curved portion, the cylindrical portion of the excavator is provided with a center bent portion which bends in a snake shape in accordance with the curved portion of the ground. Due to the spherical joint and the flat shape, the inner circumference of the circular pipe had to be machined with high accuracy, despite the inferior ability in the curved part. By adopting it, it was realized with an extremely low-cost device.

Further, the technical capability of the conventional folding machine was inferior to that of the conventional folding machine, but the capability of handling the curved portion was significantly increased in the folding machine of the present invention.

Further, in the center folding device of the excavator of the present invention,
Compared with the conventional one, since the space between the circular pipes is sealed by the elastic sealing member, it is very easy to replace a part of the excavator.

Conventionally, it has been difficult to cope with the prevention of groundwater or muddy water from a structural point of view. However, since this is an elastic sealing member, this point can be easily solved, and not only can it be used for a sharply curved portion. Two difficult problems could be overcome.

Therefore, according to the present invention, a center folding device for an excavator which facilitates excavation work, increases excavation capacity, and enables cost reduction is obtained.

[Brief description of the drawings]

FIG. 1 shows an example of a conventional excavator.

FIG. 2 shows an embodiment of a center folding device of an excavator according to the present invention.

FIG. 3 shows a state in which the folding device of FIG. 2 is operated.

FIG. 4 shows another embodiment of the center folding device of the excavator according to the present invention.

FIG. 5 shows a state in which the folding device of FIG. 4 is operated.

FIG. 6 shows another embodiment of the center folding device of the excavator of the present invention.

7 shows a plate of the elastic sealing member according to the embodiment of FIG. 6;

FIG. 8 shows another embodiment of the center folding device of the excavator of the present invention.

FIG. 9 shows a conventional example of a center folding device of an excavator according to the present invention.

DESCRIPTION OF SYMBOLS 1 Propulsion device 10 Cylinder 11 Joint part 2 Cutting part 4 Center folding device 40 Orientation correcting jack 401 Cylinder part 402 Shaft 41 Mounting tool 42 Mounting tool 43 Tension bolt 410 Rotating shaft 420 Rotating shaft 45 Elastic sealing member 450 Elastic member 451 Elastic member 452 Inlet 453 Support member 46 Elastic sealing member 460 Telescopic flexible member 47 Elastic sealing member 470 Waterproof elastic member 471 Groove 475 Plate 476 Outer part 477 Plate 478 Reinforcement ring 479 Spring plate 48 Elastic sealing member 480 plate 481 stopper 490 closing member 5 earth and sand unloading device 8 curved surface joining 9 parallel surface joining

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ko Osa 8-6-3 Arakawa, Arakawa-ku Tokyo

Claims (1)

[Claims] The present invention relates to an excavator body for excavating tunnels such as electric power, sewage, and telephones. A center folding device for a tunnel excavator, wherein a gap is formed by an elastic sealing member.