JPH0363400A - Excavated soil sealing type shield machine - Google Patents

Abstract

PURPOSE:To continuously transfer soil even if it contains large gravels, by feeding a tube, arranged at the rear part of a discharge soil adjusting valve, with pressure in turn to the longitudinal direction by means of a roller. CONSTITUTION:A plurality of cutters 2b are projected to the front face of spokes 2a of a cutter head 2. Next, the front end of a path 5a formed within a rotary shaft 5 is connected to a path 2c. And one end of a soil discharge pipe 8 is opened at the lower part of a chamber 1a installed at the front part of the shield body 1 and the other end thereof is connected to a discharge soil adjustable valve 9 equipped in the shield body 1. And a disposal pipe 10 is arranged at the upper part of the other end of the discharge pipe 8 and the rear end of the discharge soil adjustable valve 9 is connected to a soil discharging device through a foreign materials-removal box 12. And further, the shaft 20a of a main roller 20 is supported to press the tube 15 of the soil discharging device. The main roller 20 is formed to be elliptic and applied with a rubber lining layer 20b at the outer peripheral face.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an earth excavation sealed semi-shield machine (including an earth excavation sealed shield) machine having an earth removal device capable of continuously conveying large-diameter boulders.

(Conventional technology) In the conventional earth excavation sealed top shield method or the shield machine used for the shield method, the cutter head excavates the earth and sand using a screw conveyor.

After removing the soil from inside the cutter head, the soil is conveyed via a belt conveyor to the starting shaft by conveyance means such as a dump truck.
It was being transported to the surface from the starting shaft.

However, with this method, the shield machine must pause excavation while the dump truck is moving back and forth in the mine, and continuous excavation is not possible, resulting in problems such as lower excavation efficiency than the mud pressurized shield method.

In order to improve the above-mentioned problems, methods have also been implemented in which excavated earth and sand are made into a slurry and the slurry is transported within a transport pipe using a vacuum pump or a piston pump.

(Means and effects to be solved by the invention) However, with this method, it is not possible to install a large-diameter transport pipe in the mine due to the diameter of the excavation pipe and equipment space. There were other problems, such as the large-diameter boulders that were taken in along with it could not be transported by transport pipes, and it was difficult to efficiently transport them over long distances.

The properties of the soil that can be transported by transport pipes generally have a specific gravity of 1.6 to 1.8. The slump value is 15 to 20 cm.

This invention was made with the aim of improving the above-mentioned problems, and is intended to provide an elegant sealed soil excavation type shield machine that enables continuous excavation by being equipped with an earth removal device that can transport large-diameter boulders. be.

(Means and Effects for Solving the Problems) In order to achieve the above-mentioned object, the present invention aims to move earth and sand excavated by a cutter head rotatably provided at the front of the shield body into a chamber at the front of the shield body. In a sealed semi-shield machine, the soil is transported to the rear of the shield body by means of a soil removal means having a soil discharge adjustment valve that maintains the pressure in the chamber at a constant level. And, by installing an earth removal device consisting of a main roller that pumps the earth and sand inside the tube rearward by sequentially force-feeding this tube in the longitudinal direction, it is possible to continuously convey earth and sand mixed with large-diameter boulders to the rear. In this way, continuous excavation is possible even with a sealed earth excavation shield machine, and by making the protrusion of the cutter head protruding from the cutter head at least A of the diameter of the cobblestone to be excavated, it is possible to excavate m and cobblestones. Excavation can be done efficiently.

In addition, by installing a crusher between the soil removal adjustment valve and the soil removal device to crush boulders larger than the tube diameter,
To provide a sealed earth excavation type shield machine capable of transporting cobblestones having a larger diameter than a tube.

(Example) Embodiments of the invention will be described in detail with reference to the drawings.

Figure 1 shows a shield machine used in the excavation sealed semi-shield construction method, in which 1 is a shield body that can be bent freely by a direction adjustment jack 6, 2 is a cutter head installed at the front of the shield body 1, The cutter head drive motor 3 rotates the cutter head around a rotating shaft 5 via a speed reducer 4 .

As shown in FIG. 2, the cutter head 2 is formed of approximately cross-shaped spokes 2a, and a plurality of cutters 2b are arranged at intervals in the radial direction on the front surface of these spokes 2a.
These cutters 2b are used to excavate the face in front of the shield body 1 and dig up large diameter boulders.

Note that the protrusion i of each cutter 2b is set to be greater than or equal to the target boulder diameter A so that large-diameter boulders can be dug out and taken into the chamber L provided at the front of the shield body L efficiently. There is.

Further, a passage 5a is formed in the rotating wheel 5, and the front end of this passage 5a is connected to a passage 2 formed in the spoke 2a.
It is communicated within c.

The tip of the passage 5a formed in the rotating ring 5 and the tip of the passage 2c provided in each spoke 2a are connected to the cutter 2b attached to the tip of the rotating shaft 5 and the tip of the spoke 2a.
Openings are provided at the front surfaces of 2 and 2 so that the slurry material supplied from the slurry material supply pipes (not shown) to the passage 5a in the rotating shaft 5 via the rotary joint 7 is ejected from these openings into the excavated earth and sand. It has become.

On the other hand, one end of the soil removal pipe 8 is opened in the lower part of the soil bar 1a provided in the front part of the shield body 1, and the other end of the soil discharge pipe 8 is connected to a pinch valve or the like provided in the shield body 1 for soil discharge. It is connected to the adjustment valve 9.

In addition, a clog removal pipe 10 is provided at the top of the other end of the soil discharge pipe 8 to remove the clog by injecting water or the like when the soil discharge pipe 8 is clogged, and the rear end of the soil discharge adjustment valve 9 is provided for inspection and removal. Foreign matter removal box 12 provided to facilitate work when removing foreign matter
An earth removal device 13 is connected via the.

The earth removal device 13 is connected to a transport pipe 14 as shown in FIG.
It has a tube 15 with approximately the same diameter.

The tube 15 is made of an elastic material such as rubber, and frames 13a are provided on both sides of the tube 15, and the front and rear ends of the frames 13a are freely movable via a driven shaft 1.63 and a drive shaft 17a. A sprocket 16 and a driving sprocket 17 are rotatably supported.

An endless chain 18 is wound between the floating sprocket 16 and the driving sprocket 17,
These chains 18 are rotated by a rotary drive source 25 consisting of a hydraulic motor connected to the drive shaft 17a via a transmission chain 19.
Between 8 and 8 is a main roller 20 that presses the tube 15.
Both ends of the shaft 20a are supported.

The main rollers 20 are attached to, for example, two places on the chain 18, and are formed into an approximately oval shape as shown in FIG. rubber lining layer 2
0b has been applied.

A roller 21 is rotatably supported on the shaft 20a of the main roller 20 and rotates on a guide rail 13b provided along the periphery of the frame 13a. A cushioning material 22 such as rubber is laid down.

Further, the frame 13a is suspended from a bracket IC protruding from the inner surface of the tube body 1b connected to the shield body 1 via guide rods 23, as shown in FIG. A compression spring 24 is inserted into the frame 13a to urge the frame 13a downward.

Next, to explain the action, the earth and sand excavated by the Kafta hesode 2 as the shield body 1 excavates is stirred and mixed with the ejected slurry material and becomes impermeable earth and sand with flowing water, and the pressure is equal to the face earth pressure + α. is taken into the chamber 1a in a state where it is held.

The earth and sand taken into the chamber Ia are compressed by the main roller 20 of the earth removal device 13 against the tube 15, and then the back pressure generated when the tube 15 returns to its original position.

The pressure inside the chamber la causes the earth to be sent into the tube 15 of the earth removal device 13 via the earth removal pipe 8.

An earth removal adjustment valve 9 is provided between the earth removal device 13 and the earth removal pipe 8 to keep the pressure in the chamber la constant, and the earth and sand and large-diameter boulders sent into the tube 15 from the chamber 1a are The tube 15 is compressed by the main roller 20 rotated by the chain 18, and as the main roller 20 moves, the tube 15 is forced rearward inside the tube 15.

Furthermore, when the main roller 20 reaches the rear end of the tube 15, the primary main roller 20 reaches the front end of the tube 15 and starts compressing the tube 15.

It becomes impossible to continuously pump the earth and sand and large-diameter boulders mixed in the earth and sand.

Note that even if the resilience of the tube 15 deteriorates during long-term use, the pressure inside the chamber la will push the earth and sand in, so that the earth and sand can be transported reliably.

Further, the entire frame 13a is biased by the compression spring 24 in the direction of compressing the tube 15.

It is possible to prevent the main roller 20 from advancing over the boulders, and thereby even large-diameter boulders can be transported reliably.

On the other hand, in the earth removal device 13 of the above embodiment, if the diameter of the boulder is larger than the inner diameter of the tube 15, it becomes difficult to transport the earth and sand.

Therefore, as shown in Figs. 10 and 11, the earth removal device 1
A crusher 28 may be provided in place of the foreign matter removal box 12 on the earth and sand import side of No. 3.

The crusher 28 has a tubular body 28a having a slightly larger diameter than the tube 15, and a total of four hydraulic cylinders 29, two on each side, are installed with the bottom side facing the tubular body 28a.

The bottom side of the hydraulic cylinder 29 is connected to the tube body 28a.
A circular hole 28b that extends into and out of the tubular body 28a is opened, and the hydraulic cylinder 29 is guided by a guide bush 30 so that it can move forward and backward into the tubular body 28a.

Further, a saw blade-shaped crushing blade 29a for crushing boulders is formed on the bottom side of the hydraulic cylinder 28, and the tip of the piston rod 29b protruding from the head side of the hydraulic cylinder 29 connects the bin 31 to the bracket 28C. By supplying hydraulic pressure to the head side of the hydraulic cylinder 29, the hydraulic cylinder 29 protrudes into the tube body 28a, and the crushing blade 29a crushes the boulders in the tube body 28a. ing.

Note that the stroke of the hydraulic cylinder 29 does not need to be large because the boulders can be transported by the earth removal device 13 by simply breaking them into a size of approximately A to circumference. Further, numeral 32 in the figure is an inspection lid.

Next, the operation of the crusher 28 will be explained.

The earth and sand excavated by the cutter head 2 and taken into the chamber 1a is sent to the earth removal device 13 through the earth removal pipe 8. However, if the earth and sand contains cobblestones larger in diameter than the tube 15, It becomes clogged within the tube body 28a and cannot advance any further.

When this state is reached, close the soil discharge adjustment valve 9.
Since the boulders are fixed together with the earth and sand within the tube body 29a, when hydraulic pressure is supplied to the head side of the hydraulic cylinder 29 to extend the hydraulic cylinder 29, the hydraulic cylinder 29 protrudes into the tube body 29a from both sides.

The boulders are crushed by being squeezed between the crushing blades 29a.

When the crushing of the boulders is completed, the crushed boulders are removed together with earth and sand by opening the soil discharge adjustment valve 9.
The soil is fed into the tube 15 of the earth, and is forced into the transport pipe 14 by the earth removal device 13.

By repeating the above-mentioned crushing operation every time the crusher 28 is clogged with boulders, the earth and sand can be transported even if a boulder larger in diameter than the tube 15 is taken in.

(Effects of the Invention) As described in detail above, this invention is equipped with an earth removal device that compresses the tube in the longitudinal direction using a main roller and pumps out earth and sand, so even earth and sand mixed with large-diameter boulders can be continuously transported. This allows for continuous excavation using the earth excavation closed semi-shield method and the earth excavation closed shield method, and it is also easier to transport than intermittently, such as the conventional dump truck. Efficiency can be significantly improved.

In addition, it is possible to pump the sludge over long distances, and since it is pumped through a transport pipe, the inside of the mine is not contaminated with sludge.

Furthermore, the cutter protrusion (protrusion f) provided on the cutter head
By increasing l), when excavating in a stratum containing large-diameter boulders, it is possible to efficiently excavate and dig up the boulders, and it is also possible to stir and mix the slurry material injected into the earth and sand, which requires separate stirring. There is no need to provide any means.

Moreover, if a crusher is installed on the earth and sand import side of the earth removal device,
Even if boulders with a diameter larger than the tube are brought in, since they can be transported after being crushed by the crusher, there is no risk that the cobbles will become clogged and make it difficult to transport the earth and sand.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional view of the shield body, Fig. 2 is a front view thereof, and Fig. 3 is a cross-sectional view of the shield body.
4 is a plan view of the soil removal device, FIG. 5 is a side view of the same, FIG. 6 is a sectional view taken along the line vr-■ in FIG. 5, and FIG. 7 is a sectional view along line 5- ■Cross-sectional view along the line, Figure 8 is Figure 5■
9 is a sectional view taken along the line DC-1 in FIG. 5, FIG. 10 is a vertical sectional view of the shield main body showing another embodiment, and FIG. It is a sectional view along the XI line. I... Shield body. 2... Kafta head. 9... Soil discharge adjustment valve. 13...Earth removal device. 18...Chain. 28... Crusher.

Claims (5)

[Claims] (1) After taking the earth and sand excavated by the cutter head 2 rotatably provided at the front of the shield body 1 into the chamber 1a at the front of the shield body 1, the pressure inside the chamber 1a is maintained constant. In a sealed semi-shield machine in which earth is transported to the rear of the shield body 1 by means of an earth removal means having an earth removal adjustment valve 9, a tube 15 and this tube 15 are placed sequentially in the longitudinal direction behind the earth removal adjustment valve 9. A sealed earth excavation type shield machine equipped with a main roller 20 for pressure feeding and an earth removal device 13. (2) The shield machine according to claim 1, wherein at least two main rollers 20 are attached to an endless chain 18 provided along the longitudinal direction of the tube 15. (3) The shield machine according to claim 1, further comprising a foreign matter removal box 12 provided between the earth removal device 13 and the earth removal adjustment valve 9. (4) The shield machine according to claim (a), wherein the protrusion of the cutter 4 protruding from the cutter head 2 is 1/2 or more of the diameter of the cobblestone to be excavated. (5) The shield machine according to claim (1), further comprising a crusher 28 for crushing boulders having a diameter larger than the tube 15 between the soil discharge adjustment valve 9 and the soil discharge device 13.