JPH08121083A - Excavated earth and sand discharge outlet structure of screw conveyer - Google Patents

Abstract

PURPOSE: To make it possible to transport smoothly excavated earth and sand with a shield machine by compressed air to a trolley truck standing by in a tunnel. CONSTITUTION: By driving a screw conveyer, earth and sand excavated with a shield machine is conveyed into a rubber-made funnel-shaped removed soil cylinder 8 for a feed outlet communicated with a discharge outlet 6 of the screw conveyer. The earth and sand is filled up in a compressed state with the elastic force of the funnel- shaped removed soil cylinder 8 and the inclined surface which is reduced by small size toward the tip of the opening while the tip of the removed soil cylinder 8 is elastically expanded in proportion to the amount of excavated earth and sand which is discharged quantitatively from the discharge outlet 6 of the screw conveyer while a fixed amount of earth and sand is discharged to the discharge outlet 6 by way of an earth and sand conveying pipe 7. High pressure air is supplied to a clearance part between a large-sized short pipe 9 and the funnel-shaped removed soil cylinder 8 from a nozzle 11 of a high pressure air supply pipe 10 mounted to the large-sized short pipe 9, thereby conveying the earth and sand discharged from the funnel-shaped removed soil cylinder 8 into the earth and sand conveying pipe 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a sediment discharge port in a screw conveyor for discharging sediment excavated by a shield excavator to a tunnel side.

[0002]

2. Description of the Related Art When excavating a tunnel with a shield excavator, the sand excavated by a cutter plate is carried into the tunnel by a screw conveyor while the face is stabilized by earth pressure or mud pressure, and used as a trolley truck running in the tunnel. It is being loaded and discharged outside the tunnel. In this case, since the shield excavator is followed by several trolleys equipped with its control panel, hydraulic unit, etc. so that they can move integrally, the Toro trolley moves forward to the discharge port of the screw conveyor and directly from the discharge port. , Cannot receive excavated sediment.

Therefore, conventionally, a belt conveyor is disposed between the discharge port of the screw conveyor and the succeeding carriage in a state of being inclined upward toward the succeeding carriage, and a belt installed on the succeeding carriage at the end of conveyance of the inclined belt conveyor. The front end of the transport pipe is connected to the conveyor conveyor start end and the excavated earth and sand conveyor device configured to send the excavated earth and sand from the conveyor end of this belt conveyor to the Toro truck waiting on the rear side of the succeeding carriage, and the screw conveyor discharge port. The openings are connected and communicated with each other, and the transportation pipe is extended rearward from the upper portion of the trailing carriage and high-pressure air is supplied to the transportation pipe to pneumatically transport the excavated sand and sand through the transportation pipe to the Toro truck behind the succeeding carriage. Conveying devices configured to eject have been developed.

[0004]

However, in the former means for transporting excavated earth and sand by the belt conveyor, when the earth and sand discharged in an indeterminate amount from the screw conveyor side is received on the conveyor start end of the belt conveyor, It is dangerous that a large amount of parts will be loaded and the earth and sand will fall from that part, and the screw conveyor discharge port and the conveyor belt conveyor start end are separated from each other. It was necessary for the workers to constantly monitor whether the sediment discharged from the conveyor was correctly loaded on the belt conveyor.

On the other hand, according to the latter structure, in which the front end of the transportation pipe for pneumatically transporting the earth and sand is connected to and communicated with the discharge port of the screw conveyor, the above-mentioned problems due to the belt conveyor can be solved. In this case, the air pressure sent into the transport pipe acts as a back pressure on the excavated earth and sand sent out from the discharge port of the screw conveyor to transport the excavated earth and sand, while the same pressure acts on the discharge port of the screw conveyor to make the excavated earth and sand. If it is gravel or aggregated sand of small lumps even in cohesive soil, air enters into the screw conveyor through the gaps between the gravel and the lumped earth and sand, and air pressure acts on the face through this screw conveyor and the air pressure acts on the face. It may adversely affect stability. The present invention provides a structure of an excavated earth and sand delivery port of a screw conveyor for the purpose of completely eliminating such problems.

[0006]

In order to achieve the above object, the structure of the excavated earth and sand delivery port of the screw conveyor of the present invention is arranged such that the earth and sand excavated by the shield excavator is arranged in the tunnel from the screw conveyor. A funnel-shaped discharge tube that is an outlet for sending air into the earth-and-sand carrier pipe, and is connected to the large-diameter side of the funnel-shaped discharge cylinder that is gradually formed toward the tip toward the discharge port of the screw conveyor. A large-diameter short pipe is arranged on the outer periphery of the soil cylinder, and one end opening of the large-diameter short pipe is airtightly connected to the discharge port of the screw conveyor via a flange and the other end opening is connected to the earth and sand conveying pipe. The small-diameter open end of the funnel-shaped waste pipe is exposed to this sediment transfer pipe, and the high-pressure air supply pipe is connected and communicated with the peripheral wall of the large-diameter short pipe to enlarge the high-pressure air supply nozzle. Short tube and funnel Are the faces was structured in the gap portion between the soil pipe. According to the second aspect of the present invention, the funnel-shaped soil discharging cylinder is formed as a rubber funnel-shaped soil discharging cylinder elastically expandable and contractible in the radial direction.

[0007]

The excavated earth and sand discharged from the discharge port of the screw conveyor into the funnel-shaped discharge cylinder temporarily stays in the funnel-shaped discharge cylinder, but the sediment is quantitatively and forcibly discharged from the screw conveyor. Since the funnel-shaped soil discharge tube is formed to have a gradually smaller diameter toward the tip, the earth and sand sent into this funnel-shaped soil discharge tube is compressed as it moves to the tip side of the soil discharge port, and in a compacted state. Fills the funnel-shaped dump tube. From this state, when the earth and sand are fed into the rubber funnel-shaped earth discharging cylinder, the tip of the funnel-shaped earth discharging cylinder elastically expands according to the amount of earth and sand discharged from the screw conveyor side,
Discharge a certain amount of sediment into the sediment transport pipe.

On the other hand, a large-diameter short pipe that is airtightly connected to the discharge port side of the screw conveyor is provided on the outer peripheral side of the funnel-shaped soil discharge pipe, and the funnel-shaped pipe is connected from the large-diameter short pipe through the high-pressure air supply pipe. High-pressure air is constantly supplied to the space between the soil discharge pipe and the large-diameter short pipe, and flows from the space toward the inside of the sediment transport pipe. When a certain amount of earth and sand discharged in the state of closing the open end of the earth and sand conveying pipe is subjected to back pressure by the high pressure air and is conveyed all at once in the earth and sand conveying pipe.

At this time, the high-pressure air also tries to flow into the opening at the tip of the funnel-shaped drainage tube, but the opening is filled with earth and sand in a compacted state due to the contracting force of the funnel-shaped drainage tube. The open end of the funnel-shaped soil discharge tube is closed by this compacted earth and sand without any gap, and high-pressure air is prevented from flowing back into the funnel-shaped soil discharge tube.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.
In FIG. 2, reference numeral 1 denotes a shield excavator for excavating a tunnel, which has a cutter plate 2 at the front end opening of the skin plate 1a.
A partition wall 1b is provided behind the cutter plate, and a space between the partition wall 1b and the cutter plate 2 is formed in the excavated earth and sand intake chamber 3. Reference numeral 4 denotes a screw conveyor whose front end opening faces the lower part of the earth and sand intake chamber 3, and is arranged inside the machine in a state of being inclined obliquely upward toward the rear, and a screw blade is provided at the rear end. The rotation driving motor 4a is attached, and a short tubular discharge port 6 which can be opened and closed by a gate 5 is airtightly connected and communicated with the lower peripheral portion of the rear end. The discharge port 6 is connected and communicated with the front end opening of the earth and sand transport pipe 7 via the outlet A.

As shown in FIG. 1, the structure of the delivery port A is a rubber funnel-shaped earth-discharging material which is elastically expandable and contractible in the radial direction by gradually forming a small diameter toward the front end (rear end). Tube 8
And a large-diameter short pipe 9 arranged at a small interval on the outer peripheral side of the funnel-shaped earth-draining pipe 8, and a nozzle 11 connected to the peripheral wall of the large-diameter short pipe 9 to form a funnel-shaped earth-draining pipe. 8 and a high-pressure air supply pipe 10 facing an annular space 12 between the large-diameter short pipe 9.

More specifically, at the rear end of the opening of the discharge port 6 of the screw conveyor 4, the opposed front end faces of the small-diameter short pipes 13 having substantially the same inner diameter as the discharge port 6 are joined to the outer peripheral portion of the open end of the discharge port 6. The projecting flange 6a and the projecting flange 13a on the outer peripheral surface of the opposite end of the small diameter short pipe 13 are airtightly connected by a bolt 14 via a packing, and the funnel-shaped earth removal is performed on the outer peripheral surface of the small diameter short pipe 13. By fitting the large diameter portion of the cylinder 8 and fixing it with screws or the like, the funnel-shaped earth discharging cylinder 8 is communicated with the discharge port 6, and further, the void portion 12 is provided outside the small diameter short pipe 13. The large diameter ring member 15 and the front end outer peripheral flange portion 15a of the large diameter ring member 15 is connected to the flange 13a of the small diameter short pipe 13.
Is joined air-tightly via a packing and is integrally connected by the bolt 14, and a flange formed on the rear end outer peripheral flange portion 15b of the large-diameter ring member 15 on the outer peripheral surface of the front end of the large-diameter short pipe 9. 9b is hermetically joined and connected by bolts 16.

The funnel-shaped earth-discharging cylinder 8 is formed to have a length longer than the inner diameter of the discharge port of the screw conveyor 4, and its small-diameter open end faces the central portion of the front-end opening of the earth and sand conveying pipe 7. Further, the large-diameter short pipe 9 is formed in the inclined pipe portion 9a having a diameter gradually decreasing from the vicinity of the rear end of the funnel-shaped earth-draining pipe 8 toward the open end of the earth and sand transport pipe 7, and the inclined pipe portion 9a is formed. The rear end is airtightly connected to the open end of the earth and sand transport pipe 7 by a joint member 17. The nozzles 11 of the high-pressure air supply pipe 10 are provided at two places, the peripheral wall of the funnel-shaped earth-draining pipe 8 and the large-diameter ring member 15. However, the nozzles 11 are made to face the void 12 at one place to several places. It should be installed in a closed state. Reference numeral 18 is a pressure gauge attached to the peripheral wall of the large diameter short pipe 9.

As shown in FIG. 2, the earth and sand carrying pipe 7 is
The inside of the tunnel is tilted obliquely upward and extends to above the front end of the trailing carriage 19 as well as the trailing carriage 19
In the above, it extends horizontally toward the rear, and the horizontal portion is integrally fixed and supported on the succeeding carriage 19, and further,
A rear end portion protruding rearward from the rear end of the trailing carriage 19 is bent downward to face above the Toro carriage 20.

The trailing carriage 19 is equipped with a compressed air supply tank 21, a back-filling injection device 22, a control panel for each part of the shield excavator 1, a drive hydraulic unit 23, and the like.
And Toro truck 20 are rails 24 and 29 laid on the bottom of the tunnel.
Toro truck 20 travels up to the starting shaft (not shown) to transport the earth and sand, while the trailing truck 19 is connected to shield excavator 1 and integrally moves forward. Is configured. The rails 24 and 29 will be added as the tunnel is dug.

Reference numeral 25 is a high-pressure air supply pipe connected to the front end side of the horizontal portion of the earth and sand conveying pipe 7, the tip nozzle of which is connected to the earth and sand conveying pipe 7.
It is facing inward. This high pressure air supply pipe
25 is a compressed air supply tank 21 together with the high pressure air supply pipe 10
Connected to In addition to the high pressure air supply pipe 25, a high pressure air supply pipe may be connected to the earth and sand transport pipe 7 at an appropriate place. Reference numeral 26 denotes a rotation driving motor for the cutter plate 2 of the shield excavator 1, which is arranged on the back side of the partition wall 1b. The shield excavator 1 propels the tunnel lining 27 with a reaction force by a propulsion jack (not shown).

The action of the excavated earth and sand delivery port in the shield excavator 1 constructed as described above will be described. The earth and sand excavated by the cutter plate 2 of the shield excavator 1 is taken in by the rear surface side of the cutter plate 2. It is taken into the chamber 3 and conveyed backward by the screw conveyor 4. The excavated earth and sand reaching the discharge port 6 of the screw conveyor 4 is quantitatively discharged into the funnel-shaped earth discharge cylinder 8 of the delivery port A by opening the gate 5, and the funnel-shaped earth and sand discharge cylinder 8 is filled with the excavated earth and sand. .

Since a certain amount of excavated earth and sand is discharged from the discharge port 6 of the screw conveyor 4 into the rubber funnel-shaped soil discharging pipe 8 every time the gate 5 is opened and closed, the excavated sand is temporarily retained in the funnel-shaped soil discharging pipe 8. The discharged earth and sand is sent to the rear side of the funnel-shaped earth discharge pipe 8 by the next discharge of the excavated earth and sand, but since the funnel-shaped earth discharge pipe 8 is gradually formed to have a smaller diameter toward the rear end, the earth and sand is discharged from the funnel. The rubber funnel-shaped earth-moving cylinder 8 is filled with the rubber-shaped funnel-shaped earth-moving cylinder 8 in a compacted state by being compressed by the inclined inner surface of the funnel-shaped earth-moving cylinder 8 as it moves rearward. In this case, the funnel-shaped dumper 8
Expands due to its elasticity, but as the diameter increases, the compressive force against the soil increases and maintains a consolidated state.

From this state, the screw conveyor 4
When a certain amount of earth and sand is forcibly discharged into the funnel-shaped soil discharge tube 8 from the discharge port 6 of the
The small-diameter tip opening of the funnel-shaped excavator 8 is sent out from the tip-end small-diameter opening of the funnel-shaped excavator 8 after elastically expanding the diameter of the small-diameter tip opening to the front-end opening side of the earth-and-sand carrier pipe 7. The elastic force immediately contracts a certain amount to maintain the soil in the open end in a compacted state.

On the other hand, high-pressure air is constantly fed from the tip nozzle 11 thereof through the high-pressure air supply pipe 10 into the space 12 between the funnel-shaped soil discharge pipe 8 and the large-diameter short pipe 9. The air flows through the voids 12 toward the earth and sand carrier pipe 7 side, and the earth and sand sent to the opening side of the funnel-shaped earth discharging cylinder 8 is conveyed into the earth and sand carrier pipe 7 by its air pressure. At this time, the high-pressure air also tries to flow into the tip end opening portion of the funnel-shaped earth-draining tube 8, but the opening is filled with earth and sand in a compacted state by the elastic contracting force of the funnel-shaped earth-draining tube 8. , Funnel-shaped dumper 8
The small-diameter open end of is closed without gaps by this compacted earth and sand,
It prevents the high-pressure air from flowing back into the funnel-shaped earth-moving tube 8.

The earth and sand are transferred into the earth and sand transfer pipe 7 when the amount of the earth and sand sent out from the funnel-shaped discharge tube 8 closes the opening cross-sectional area of the earth and sand transfer pipe 7 by a certain ratio or more. The back pressure of the high-pressure air that acts increases, and the earth and sand are conveyed in the earth-and-sand conveyance pipe 7 at once by the high-pressure air. In this way, the earth and sand sent out from the funnel-shaped earth discharging pipe 8 are intermittently conveyed to the earth and sand conveying pipe 7 side by high-pressure air at a constant amount, and the high pressure provided in the proper place of the earth and sand conveying pipe 7 during the conveyance. While being floated by the air flow from the air supply pipe 25, it is transported backward in the earth and sand transport pipe 7.
The earth and sand transported to the rear end of the earth and sand transport pipe 7 is loaded and loaded in the waiting truck 20 and then carried out by the towing vehicle 28 to the starting shaft side.

In the above embodiment, the high-pressure air supply pipes 10 and 25 are connected to the compressed air supply tank 21 installed in the trailing carriage 19, but the trailing carriage 19 is equipped with a compressor. High pressure air supply pipe by compressor 1
It may be supplied to 0, 25, high pressure air from the starting shaft side through a suitable hose, these supply pipes 10,
It may be configured to supply 25. Further, the high-pressure air supply pipes 10 and 25 may not be constantly supplied, but may be configured to be intermittently supplied as appropriate.

[0023]

As described above, according to the structure of the excavated earth and sand delivery port of the screw conveyor according to the present invention, the discharge port of the screw conveyor is provided with a funnel-shaped earth-moving tube which is gradually reduced in diameter toward the tip. The large-diameter side is connected and communicated, and a large-diameter short pipe is arranged on the outer periphery of this funnel-shaped earth-draining pipe, and one end opening of the large-diameter short pipe is hermetically sealed to the discharge port of the screw conveyor via a flange. In addition to connecting, the other end opening is connected and communicated with the sediment transfer pipe, and the small-diameter open end of the funnel-shaped discharge pipe is exposed to this sediment-transfer pipe. By excavating the excavated earth and sand sent from the discharge port of the screw conveyor into the funnel-shaped earth-draining tube by the material, the elastic force of the funnel-shaped earth-draining tube and the inclined inner surface that becomes smaller in diameter toward the tip end Compress in the funnel-shaped dumper to fill it in a consolidated state. Along with being able to expand the tip portion from the small-diameter tip opening of the funnel-shaped earth discharging cylinder according to the excavated earth and sand discharged quantitatively from the screw conveyor, a certain amount of compacted earth and sand is transferred to the earth and sand carrier pipe side. It can be sent out, and after sending out, the small-diameter tip opening can be contracted by its elastic restoring force to maintain the soil in the opening in a compacted state.

Further, since the high-pressure air supply pipe is connected to and communicated with the peripheral wall of the large-diameter short pipe so that the high-pressure air supply nozzle faces the space between the large-diameter short pipe and the funnel-shaped earth-draining pipe. , High-pressure air flows to the side of the earth and sand transport pipe and acts as a back pressure on a certain amount of earth and sand sent from the funnel-shaped earth discharging pipe to the side of the earth and sand transport pipe, and the pressure can be carried out at once in the earth and sand transport pipe. Moreover, since the tip small-diameter opening of the funnel-shaped earth-draining tube is filled with soil in a compacted state, it is possible to reliably prevent the air from flowing back into the funnel-shaped earth-draining tube. There is no possibility that the face will be adversely affected, and the high-pressure air can be concentrated on the earth and sand to be conveyed, so that the high-pressure air can be reliably discharged.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an excavated earth and sand delivery port of a screw conveyor,

FIG. 2 is a simplified vertical sectional side view of the entire shield excavator provided with this outlet.

FIG. 3 is a rear view thereof.

[Explanation of symbols]

 1 Shield Excavator 4 Screw Conveyor 6 Discharge Port 7 Sediment Transport Pipe 8 Funnel-shaped Discharge Pipe 9 Large Diameter Short Pipe 10 High Pressure Air Supply Pipe 11 Its Nozzle 12 Void

Claims (2)

[Claims] 1. A delivery port for delivering earth and sand excavated by a shield excavator from a screw conveyor into an earth and sand transport pipe by air arranged in a tunnel, and a diameter gradually decreasing toward a tip of a discharge port of the screw conveyor. The large-diameter side of the funnel-shaped earth-moving cylinder formed in the above is connected and communicated, and a large-diameter short pipe is arranged on the outer periphery of the funnel-shaped earth-discharging pipe, and the one end opening of the large-diameter short pipe is screw-conveyed The air-tightly connected to the discharge port of the other through the flange and the other end opening is connected to and communicate with the earth and sand carrier pipe, the small diameter open end of the funnel-shaped earth discharging pipe is exposed to the earth and sand carrier pipe, A screw characterized in that a high-pressure air supply pipe is connected and communicated with the peripheral wall of the large-diameter short pipe so that the high-pressure air supply nozzle faces the space between the large-diameter short pipe and the funnel-shaped earth pipe. Structure of excavated sediment discharge port of conveyor. 2. The structure of the excavated earth and sand discharge port of the screw conveyor according to claim 1, wherein the funnel-shaped earth discharging pipe is a rubber funnel-shaped earth discharging pipe elastically expandable and contractible in a radial direction.