JPH01322093A - Drilling machine having sediment pressure adjustment function - Google Patents

Abstract

PURPOSE:To ensure the safety by providing a shock absorber in a sediment chamber for changing the capacity thereof in a pressurized sediment transfer device for transferring the sediment from the sediment chamber located aft of the sediment transfer means in the body of a drilling machine. CONSTITUTION:A sediment chamber 16 is formed between the rear end of a transfer pipe 4 for transferring sediment and a division 8, and there is provided a pressurized sediment transfer pump comprising a barrel-shaped cylinder 17 and a piston 18 under the pipe 4. Then, a drive system 9 is actuated and a drilling machine body 1 is propelled with a source pressing jack, thereby transferring sediment after drilling to a chamber 16. Furthermore, the cylinder 17 is made to slide for taking in the sediment and connected to the discharge port 19a of a pressurized sediment transfer pipe 19, thereby pushing the piston 18 and discharging the sediment into the pipe 19. Then, a pressure rise in the chamber 16 due to the sediment is absorbed by an air bag 20, thereby restraining the pressure fluctuation of a cutter part.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is applicable to the construction of the top of the pipe when burying various pipe bodies, including pipes constituting a cable storage conduit, in the ground by the propulsion method. This relates to a tunnel excavation machine that is used to excavate earth and sand in front of the tunnel in the direction of travel and discharge the excavated earth and sand to the rear.

(Prior art) Conventionally, in this type of excavation machine, in order to discharge the excavated earth and sand backwards, a screw conveyor or a bell 1~
Conveyors, etc. were used, but in view of the increasing size of equipment, recently, for example, the applicant has
6285, a cylinder protruding from one end of the earth and sand chamber located behind the earth and sand transfer means in the excavation machine main body and connected to the discharge port at the other end, and a piston that is slidable inside the cylinder. A technology has been proposed for discharging excavated earth and sand using an earth and sand pumping device.

According to such an earth and sand pumping device, a cylindrical cylinder protrudes into the earth and sand chamber, that is, a space behind the earth and sand transfer means where earth and sand accumulates, and holds the accumulated earth and sand, and then the piston is moved into the cylinder by a jack or the like. The excavated earth and sand are discharged to the rear by sliding the inside of the cylinder and pushing the earth and sand inside the cylinder to the discharge port.

(Problem to be solved by the invention) However, as long as such a configuration is simply adopted, the excavation machine itself is propelled even while the cylinder holds the earth and sand in the earth and sand chamber and is connected to the discharge port. The collected soil is being sent into the sand chamber one after another. As a result, the discharge port is blocked and the sediment, which has no other place to go, fills the sediment chamber and eventually builds up a large pressure.

When the pressure inside the earth and sand chamber increases in this way, the pressure propagates forward accordingly and applies pressure from the face to other mountains in front, so there are concerns that the ground may sink or rise. Undesirable.

The object of the present invention is to solve such problems and provide a trenching machine that is safer and more efficient in pumping excavated earth and sand backwards.

(Means for Solving the Problems) In order to solve the problems, this invention aims to solve the problems by providing a buffering machine in the earth and sand chamber for adjusting the pressure inside the earth and sand chamber in which earth and sand accumulates. be. Regarding the specific configuration adopted by this invention, a cylinder protrudes from one end of the earth and sand chamber located at the rear of the earth and sand transfer means in the excavation machine main body and is connected to the discharge I at the other end; This excavation machine has an earth and sand pumping device constituted by screws 1 to 1 that are slidable in the cylinder, and the earth and sand chamber is provided with a buffer that changes the volume within the earth and sand chamber.

Here, the term "balancer" includes suspensions using air, springs, etc., shock absorbers, and the like. As a means of changing the volume inside the sediment chamber,
For example, the back side of one wall of the earth and sand chamber may be supported by these balancers so that it can be protruded and retracted, or an appropriate sealed object that can be freely protruded into the earth and sand chamber may be supported by the balancer.

In this regard, by installing an air-tight air bag inside the earth-and-sand chamber, it is possible to simultaneously obtain a buffering function and a function of changing the volume inside the earth-and-sand chamber.

In order to make the degree of buffering of the buffer variable variable, the pressure of the air and the spring in the suspension and shock absorber described above and the elastic coefficient of the spring may be changed. In the case of an air bag, the initial pressure of the air it holds may be changed.

(Function) Even if the cylinder passes through the earth and sand chamber and is connected to the discharge port, and the excavated earth and sand fills the earth and sand chamber and increases the pressure,
The buffer absorbs the pressure by contracting, and the volume inside the sand chamber increases, so the pressure of the sand does not propagate forward.

Then, when the cylinder retracts from the dirt chamber in preparation for the next stroke, creating a space in the dirt chamber, the compressed buffer tries to recover and pushes the dirt into that space. Therefore, the soil that the cylinder is about to take up on the next stroke is quickly prepared.

(Example) The present invention will be described in detail below. Reference numeral 1 denotes a digging machine main body having a substantially cylindrical outer shape, and a direction correction @3 is provided in front of the main body through a bellows seal 2 and the like. This direction correction tube 3
The direction can be adjusted appropriately in a so-called "oscillation type" manner by means of a direction adjustment jack 5 supported by a transfer pipe 4 or the like installed in the digging machine main body 1. A stirring shaft 7 having a paddle 6 as a stirring protrusion on the outer periphery is rotatably held at the center of the digging machine main body 1, and the rear end of this stirring shaft 6 penetrates the partition wall 8 at the rear of the digging machine. It is interlocked and connected by a universal joint 10 to a drive bag R9 such as a motor installed inside the digging machine main body 1 behind the partition wall 8.

On the other hand, a cutter member 12 that protrudes from a chamber 11 located within the direction correction cylinder 3 is fixed to the shaft tip of the stirring shaft 7 . When the drive device 9 is operated, the stirring shaft 7 rotates, and the cutter member 12 rotates at the same time. A slurry agent discharge hole 13 is located in front of the navigator member 12, and is configured to discharge the slurry agent sent from inside the starting side shaft. Further, a rotary support member 14 rotatably holds the vicinity of the tip of the stirring shaft 7 within the chamber 11, and a stirring blade 15 is fixed to the stirring shaft 7 immediately behind it. The stirring blades 15 are effective in scraping off the dirt adhering to the inner wall of the chamber 11 to make the transport of the sand smoother, and kneading the dirt in the chamber 11 to make the properties of the sand suitable for transport.

The space between the rear end of the transfer pipe 4 and the bulkhead 8 forms a sand chamber 16. In the space below the transfer pipe 4, an earth and sand pump serving as an earth and sand pumping device is installed. This earth and sand pump consists of a cylindrical cylinder 17 that can freely slide into the earth and sand chamber I6, and a piston 18 that is supported by a suitable hydraulic jack so as to be able to slide inside this cylinder 17. A cylinder 17 is connected to the discharge port 19a of the earth and sand pressure feeding pipe 19 leading to the rear.
can be freely connected.

An airbag 2o is attached above the dirt chamber 16. As shown in FIG. 2, the airbag 20 in this embodiment includes a top plate 20a on the sediment chamber 16 side;
It is composed of a substantially bellows-shaped sealed contraction part 20b made of a rubber material fixed to the base plate 20c, and a base plate 20c having an upper part of the contraction part 20b fixed to the inner wall of the digging machine main body 1. The air is sealed inside. Therefore, when a pressure higher than the air pressure of the air in the contraction part 20b is applied to the top plate 20a, the contraction part 20b contracts in the direction of the arrow in FIG. 2.

This embodiment is configured as follows.
To explain how it works, when the driving device 9 is operated and the excavation machine main body is propelled from the shaft into the soil by a separate push jack (not shown), the slurry agent is discharged from the slurry discharge hole 3. While being discharged, the cutter member 12 rotates to cut the ground in front, and the resulting soil is sufficiently mixed by the paddle 6 of the stirring shaft 7, and is transferred to the rear soil chamber as the excavation machine main body 1 moves forward. 16.

These sediments that have reached the sediment chamber 16 accumulate in order from the bottom of the sediment chamber 16, so at this stage the cylinder 1
7 is slid, the accumulated earth and sand is taken into the cylinder 17 and connected to the discharge port 19a of the earth and sand pumping pipe 19. After that, the piston 18 is pushed out and the taken-in earth and sand is pushed out into the earth and sand pumping pipe 19,
It is ejected backwards.

During the earth and sand discharge work, the digging machine main body 1 is propelled even while the cylinder 17 is sealing the earth and sand, and the excavated earth and sand are sent one after another to the earth and sand chamber 16, and the earth and sand chamber 16 is filled. , will have a high pressure, but the airbag 2
0 absorbs the pressure of the earth and sand and contracts, so the pressure does not propagate forward.

When the pressure transfer of the earth and sand in the cylinder 17 is completed and the cylinder 17 retracts to the lower part of the transfer pipe 4 in order to take in the earth and sand again, the part occupied by the cylinder 17 until now becomes a space, so that the earth and sand will be removed. Flow into space. At this time, the deflated airbag 20 tries to return to its original state and pushes the earth and sand downward. Therefore, the earth and sand are efficiently pushed into the space in which the cylinder 17 slides, and the next stroke can be performed quickly.

(Effects of the Invention) According to the present invention, pressure fluctuations in the earth and sand chamber are suppressed, so pressure fluctuations in a part of the cutter are suppressed, an excessive load is prevented, and smooth cutting is possible.

In addition, it prevents negative effects on the ground, prevents unexpected situations such as ground subsidence and ground upheaval, and enables safe excavation work.

Furthermore, due to the restoring function of the balancer, when the balancer tries to return to its original position, it will press down on the earth and sand in the sediment chamber, so when the cylinder retracts from the sediment chamber, it will move toward the space previously occupied by the cylinder. Since it is like pushing the earth and sand in, the suction of the earth and sand is better.
This increases pumping efficiency and allows for rapid excavation work.

In addition, by appropriately adjusting the degree of buffering of the buffer depending on the nature of the ground, the pressure that causes part of the cutter to loosen can always be maintained within an appropriate range.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of the embodiment, and FIG. 2 is a sectional view taken along line A--A in FIG. 1. In the figure, ■ is the main body of the horishin machine, 6 is the paddle, 7 is the stirring shaft,
8 is a partition wall, 9 is a drive device, 12 is a cutter member, 16 is an earth and sand chamber, 17 is a cylinder, 18 is a screw, 19 is a pipe for pumping earth and sand, and 20 is an air bag.

Claims (3)

[Claims] (1) Sediment consisting of a cylinder that protrudes from one end of the earth and sand chamber located behind the earth and sand transfer means in the excavation machine body and is connected to the discharge port at the other end, and a piston that can freely slide inside the cylinder. 1. A digging machine having an earth and sand pressure adjustment function, which is equipped with a pressure feeding device and is characterized in that the earth and sand chamber is provided with a buffering device that changes the volume within the earth and sand chamber. (2) The excavation machine having a soil pressure adjustment function according to claim (1), wherein the buffering machine is an air bag. (3) An excavation machine having a soil pressure adjustment function according to claim (1) or (2), characterized in that the degree of buffering of the buffering machine is variable.