JP2001241296A - Earth and sand moving tank for tunnel excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an earth and sand moving tank for a tunnel excavator which does neither decrease an earth and sand receiving area even if an outer cylinder is rotated by reaction force during the boring nor, also deteriorates earth and sand moving capacity. SOLUTION: In the earth and sand moving tank for the tunnel excavator receiving earth and sand taken in a chamber of the tunnel excavator from a cutting face excavated by a cutter and moving the earth and sand to the outside of the tunnel through an earth and sand moving pipe, the earth and sand moving tank for the tunnel excavator having a moving device between the earth and sand moving tank 2 and outer cylinder 1 of the tunnel excavator so that the earth and sand moving tank 2 can be moved to the circumferential direction along the inside circumference of the outer cylinder 1 of the tunnel excavator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sediment discharging tank used for discharging sediment from a tunnel excavator.

[0002]

2. Description of the Related Art As a method of constructing a tunnel underground without digging, there is a method of excavating underground by a cylindrical shield excavator. In particular, when constructing a small-diameter tunnel for burying sewer pipes etc. in the ground, a construction method is to insert a fume pipe or steel pipe (referred to as a propulsion pipe) in the back of a shield excavator. 2. Description of the Related Art A semi-shield method is known in which a plurality of hume pipes or steel pipes are pushed in from the rearmost end by a propulsion jack.

[0003] When constructing a small-diameter tunnel by such a semi-shield method, the problem with discharging the earth and sand excavated by a shield machine from the inside of the tunnel is that the diameter of the tunnel is small. Therefore, how to efficiently discharge in a narrow space.

One of the solutions to such a problem is as follows.
There is a method of discharging earth and sand using a pumping pipe. When discharging earth and sand by this method, it is necessary to separate large-diameter gravels (depending on the excavation conditions, for example, a diameter of 60 mm or more) that cannot pass through the pumping pipe from the earth and sand.

[0005] As a conventional sediment transport device of a semi-shield excavator having means for separating large-diameter gravels from soil, there is a sediment transport device disclosed in Japanese Patent Application Laid-Open No. 7-269294.

As shown in a vertical sectional view of the semi-shield excavator in FIG. 4, the earth-sand transporting apparatus is excavated by a cutter head 32 provided at a front portion of a semi-shield excavator main body 31 to form a chamber 31a. Sediment-sealing semi-sealing, in which the sediment taken into the inside is conveyed backward by a sediment pump.
In the earth and sand transporting device of the drilling machine, a large-diameter boulder separating means 34 for separating large-diameter boulders (large-diameter gravels) mixed in the earth and sand behind a discharge pipe 33 for discharging the earth and sand in the chamber 31a.
And a hopper (generally called a sediment discharge tank) 35 for sending the sediment separated by the large-diameter boulder separating means 34 to the sediment pressure pump below the large-diameter boulder separating means 34. It is.

The above-mentioned large diameter cobblestone separating means (hereinafter referred to as trommel) 34 includes a plurality of vertical members 34a arranged in parallel with the axis of the semi-shield machine 31 and forming a cylindrical shape. A cylindrical cage body is formed from the spiral member 34b spirally wound around the plurality of vertical members 34a. Then, the adjacent vertical members 34
The gap formed by the spiral member 34a and the spiral member 34b is set to a size such that a large-diameter boulder having a certain size or more that has entered the trommel 34 cannot pass through, but only earth and sand having a size smaller than that.

Therefore, the earth and sand falls downward through the trommel 34, is accommodated in the hopper 35, and is discharged through the earth and sand discharge pipe 36 by the earth and sand pump, but the large-diameter boulders remain in the trommel 34 and accumulate in a certain amount. At that point, it is discharged to the outside through an outlet provided on the opposite side of the sediment inlet, and is carried out on a different route from the sediment.

[0009]

However, the earth and sand discharge tank of the earth and sand transporting device disclosed in Japanese Patent Laid-Open No. 7-269294 has the following problems. Semi-sea
In tunnel excavation work using the tunnel construction method,
If the cutter hits hard rock etc. while excavating with the cutter head of the machine,
Since the rotation of the head is prevented, the rotation reaction force is transmitted to a propulsion pipe such as a hume pipe pushing the main body of the semi-shield excavator, and the propulsion pipe is rotated around the shaft center in the rotating direction of the cutter head. A phenomenon called so-called rolling, which rotates in a direction opposite to the above, may occur.

When the rolling occurs, as shown in the cross-sectional view of the outer cylinder of the tunnel excavator in FIG. The volume for containing the earth and sand is reduced as indicated by the dotted line, and
Sediment discharge pipes 43a and 43 for discharging sediment from
Of b, since the entrance of the earth and sand discharge pipe 43b is exposed in the air, the air is sucked, and the earth and sand discharge capacity of the earth and sand pump is reduced, so that the earth and sand cannot be efficiently discharged. In FIG. 5, an example in which the number of the sediment discharge pipes is two has been described.

According to the present invention, since the earth and sand discharge tank does not tilt even if rolling occurs, the earth and sand storage capacity of the earth and sand discharge tank does not decrease and the earth and sand discharge capacity of the earth and sand discharge pipe does not decrease. It aims to provide a discharge tank.

[0012]

The earth and sand discharge tank of a tunnel excavator according to the present invention accommodates earth and sand excavated by a cutter and taken in from a face into a chamber of the tunnel excavator, and is discharged out of the tunnel through an earth and sand discharge pipe. Between the earth and sand discharge tank and the tunnel excavator outer cylinder so that the earth and sand discharge tank can move in the circumferential direction along the inner peripheral surface of the tunnel excavator outer cylinder. Is provided with moving means.

Further, the moving means comprises a plurality of cylindrical or cylindrical rods arranged in parallel with the axis of the outer cylinder of the tunnel excavator.

Further, the moving means is a liner material for reducing frictional resistance of the earth and sand discharge tank body.

Further, the moving means is a rotary roller provided on an outer surface of a bottom portion of the earth and sand discharge tank main body.

In the earth and sand discharge tank for a tunnel excavator according to the present invention, a plurality of cylindrical or cylindrical rods arranged in parallel with the axis of the outer cylinder of the tunnel excavator and the frictional resistance of the earth and sand discharge tank body are reduced. The sediment discharge tank body is configured to be movable in the circumferential direction along the inner peripheral surface of the tunnel excavator outer cylinder by a rotating roller provided on the bottom outer surface of the liner material or the sediment discharge tank body. Therefore, even if the outer cylinder of the tunnel excavator rolls and the earth and sand discharge tank body tilts, it can be returned to the original state in a short time using a jack or the like.

Therefore, the earth and sand storage capacity of the earth and sand discharge tank does not decrease, and the earth and sand discharge capacity of the earth and sand discharge pipe does not decrease.

[0018]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view of a first embodiment of a soil excavation tank of a tunnel excavator of the present invention,
(A) is a perspective view of a sediment discharge tank, (b) is a cross-sectional view of a sediment discharge tank.

The earth and sand discharge tank comprises a plurality of circular rod-like bodies 3 between a propulsion pipe 1 for propelling the semi-shield excavator and the earth and sand discharge tank main body 2 parallel to the axis of the propulsion pipe 1.
Has been arranged.

When the propulsion pipe 1 rolls and the sediment discharge tank body 2 is tilted, a jack mounting jig 4 provided on the propulsion pipe 1 and a jack mounting jig 5 provided on the sediment discharge tank body 2 are provided. The earth and sand discharge tank main body 2 can be easily moved in the circumferential direction with the rod-shaped body 3 serving as a roller, and can be returned to the original state.

Therefore, the sediment storage capacity of the sediment discharge tank 2 does not decrease, and the ability of the sediment discharge pipe 6 to discharge sediment does not decrease.

FIG. 2 is an explanatory view of a second embodiment of the earth and sand discharge tank of the tunnel excavator according to the present invention, and (a).
FIG. 2 is a perspective view of a sediment discharge tank, and FIG.

This sediment discharge tank is provided with a resin-made liner 13a of a fixed length along the circumferential direction on the inner peripheral surface of a propulsion pipe 11 for propelling a semi-shield excavator. A resin liner 13b is also provided on the bottom outer surface at a position facing the resin liner 13a.
A plurality of resin-made liners 13a and 13b are provided along the longitudinal direction of the propulsion pipe 11 and the earth and sand discharge tank main body 12.

When the propulsion pipe 11 rolls and the sediment discharge tank body 12 tilts, the jack mounting jig 14 provided on the propulsion pipe 11 and the sediment discharge tank main body 1
A jack is disposed between the jack mounting jig 15 and the resin liner 13b, and the resin liner 13b is slid on the resin liner 13a to easily move the sediment discharge tank body 12 in the circumferential direction. It can be moved back to its original state.

Therefore, the earth and sand storage capacity of the earth and sand discharge tank 12 does not decrease, and the earth and sand discharge capacity of the earth and sand discharge pipe 16 does not decrease.

The resin liners 13a and 13b are
For example, polyethylene may be used, but other resins or other materials may be used.

The resin liners 13a and 13a
b may be provided on the entire contact surface between the propulsion pipe 11 and the earth and sand discharge tank main body 12.

FIG. 3 is an explanatory view of a third embodiment of the earth and sand discharge tank of the tunnel excavator according to the present invention, and (a).
FIG. 2 is a perspective view of a sediment discharge tank, and FIG.

This earth and sand discharge tank is provided with a rotating roller 23 on the bottom outer surface of the earth and sand discharge tank main body 22, and the earth and sand discharge tank main body 22 is provided on the inner peripheral surface of a propulsion pipe 21 for propelling a semi-shield excavator. Along the circumference.

When the propulsion pipe 21 rolls and the sediment discharge tank body 22 tilts, the jack mounting jig 24 provided on the propulsion pipe 21 and the sediment discharge tank body 2 are rotated.
2, a jack is arranged between the jack mounting jig 25 and the jack, and the jack 22 is pushed by the jack to move the earth and sand discharge tank main body 22 by the rotary roller 23 to return to the original state.

Therefore, the sediment storage capacity of the sediment discharge tank 22 does not decrease, and the ability of the sediment discharge pipe 26 to discharge sediment does not decrease.

In the description of the embodiment of the earth and sand discharge tank of the tunnel excavator according to the present invention, the earth and sand discharge tank of the semi-shield excavator has been described as an example. It is needless to say that the present invention can also be applied to a sediment discharge tank.

[0033]

According to the present invention, even if rolling occurs during excavation of a tunnel by a tunnel excavator, the sediment storage capacity of the sediment discharge tank does not decrease, and the sediment discharge capacity of the sediment discharge pipe does not decrease.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a first embodiment of a sediment discharge tank of a tunnel excavator according to the present invention, wherein (a) is a perspective view of the sediment discharge tank, and (b) is a cross-sectional view of the sediment discharge tank. is there.

FIGS. 2A and 2B are explanatory views of a second embodiment of the earth and sand discharge tank of the tunnel excavator of the present invention, wherein FIG. 2A is a perspective view of the earth and sand discharge tank, and FIG. is there.

FIG. 3 is an explanatory view of a third embodiment of the earth and sand discharge tank of the tunnel excavator of the present invention, wherein (a) is a perspective view of the earth and sand discharge tank, and (b) is a cross-sectional view of the earth and sand discharge tank. is there.

FIG. 4 is a longitudinal sectional view of the semi-shield excavator.

FIG. 5 is a cross-sectional view showing a state in which the earth and sand discharge tank is loosened by rolling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Propulsion pipe 2 Sediment discharge tank main body 3 Rod-shaped body 4 Jack mounting jig 5 Jack mounting jig 6 Sediment discharge pipe 11 Propulsion pipe 12 Sediment discharge tank main body 13a, 13b Liner 14 Jack mounting jig 15 Jack mounting jig 16 Sediment Discharge pipe 21 Propulsion pipe 22 Sediment discharge tank main body 23 Rotary roller 24 Jack mounting jig 25 Jack mounting jig 26 Sediment discharge pipe

Claims (4)

[Claims] 1. A soil excavation tank for a tunnel excavator for receiving sediment excavated by a cutter and taken from a face into a chamber of the tunnel excavator and discharging the excavated soil out of the tunnel through a sediment discharge pipe. A tunnel excavator, wherein a moving means is provided between the sediment discharge tank and the tunnel excavator outer cylinder so that the tunnel excavator outer cylinder can move in the circumferential direction along the inner peripheral surface of the tunnel excavator outer cylinder. Sediment discharge tank. 2. The tunnel excavator according to claim 1, wherein the moving means comprises a plurality of cylindrical or cylindrical rods arranged in parallel with the axis of the tunnel excavator outer cylinder. Sediment discharge tank. 3. The earth and sand discharge tank of a tunnel excavator according to claim 1, wherein said moving means is a liner material for reducing frictional resistance of the earth and sand discharge tank main body. 4. The earth and sand discharge tank of a tunnel excavator according to claim 1, wherein said moving means is a rotary roller provided on an outer surface of a bottom portion of said earth and sand discharge tank main body.