JPH0413520B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention provides a method for burying various types of pipe bodies, including pipes constituting cable storage conduits, in the ground using a propulsion method. This relates to a tunnel boring machine that is positioned at the front and is used to excavate earth and sand in front of the tunnel in the direction of travel and discharge the excavated earth.

(Conventional technology) Conventional excavators used a screw conveyor or belt conveyor to transport excavated earth backwards, and also used an earth pressure pump, etc. to discharge the excavated earth backwards. .

(Problems to be Solved by the Invention) However, existing excavators have had the following problems.

First, in an attempt to downsize drive system equipment, if the leading cutter and the screw conveyor, which is the transfer means, are made into one system, that is, a coaxial type, the rotary shaft can only rotate in one direction due to the action of the screw conveyor. Therefore, the entire excavator tends to roll while digging, and even if rolling occurs, it becomes impossible to correct it.

To prevent this, if you want to enable the cutter to move forward and backward, you must separate the drive system for the screw conveyor, etc. and the cutter, and as a result, two drive systems are required, and the various components of the drive system becomes bloated.

In addition, in the past, the cut earth and sand was transported as is, so there was a risk that large gravel, clods, etc. would get into the earth and sand chamber and become an obstacle when being discharged to the rear.

Therefore, with this new type of excavator, the problem of how to reduce the size of the drive system equipment, make it easy to correct rolling, and deal with gravel, clods, etc. that become an obstacle when pumping earth and sand is solved. This is a problem that should be addressed.

(Means for Solving the Problems) This invention has been made in view of the above points, and does not specifically provide a transfer means for transferring the excavated earth from the leading cutter to the earth pumping device, but instead The problem was solved by installing a stirring shaft to break up and stir the soil clods, taking into consideration the location of the earth and sand pumping device, and installing an opening below the excavator.

Regarding its specific configuration, a stirring shaft is rotatably provided in the earth and sand transfer path within the excavator main body, and furthermore, a sand chamber is provided behind the stirring shaft, and an earth and sand pumping device is installed above the earth and sand chamber. In addition to providing
An opening communicating with the outside of the excavator body is provided below the earth and sand chamber, and the stirring shaft is coaxial with or directly connected to the cutter rotating shaft.

(Function) When the drive device is activated, the cutter at the tip and the stirring shaft rotate at the same time, and when the entire excavator is propelled into the soil by the separately installed main pusher jack, the excavator is cut by the cutter. The earth and sand are transferred to the rear as the excavator moves forward. Therefore, only one drive system is required. The earth and sand transferred at this time is stirred by a stirring shaft, and the viscous material and the excavated earth are well mixed by the mixing effect, and the shape and size are suitable for being pumped by an earth and sand pumping device such as an earth and sand pump. Well, it becomes a nature. At this time, of course, the soil clods are also broken into small pieces. Since there is an opening at the bottom of the earth and sand chamber that leads to the outside of the excavator, gravel and other earth and sand that cannot be pumped by the earth and sand pumping device are discharged from this opening to the outside, that is, to the ground. Become.

In addition, since the stirring shaft itself has no directionality, it is possible to rotate forward and reverse, and if the excavator rolls during propulsion, it can be easily corrected by rotating the cutter in the opposite direction to the rolling direction. .

(Example) Hereinafter, an example of the present invention will be described. Reference numeral 1 denotes a substantially double-cylindrical excavator main body, which has a direction correction cylinder 3 in front thereof via a bellows seal 2, and a direction correction jack 4 supported by an inner cylinder 1a of the excavator main body 1.
Accordingly, the direction of the direction correction tube 3 can be adjusted as appropriate. A stirring shaft 6 having a stirring protrusion 5 on the outer periphery is rotatably held in the center of the excavator main body 1, and the rear end of this stirring shaft 6 penetrates the bulkhead 7 at the rear of the excavator, and It is interlocked and connected by a drive device 8 installed at the rear lower part of the main body 1 and a universal joint 9.

On the other hand, the shaft tip of the stirring shaft 6 is connected to a cutter 10 protruding from the front of the excavator main body 1, and when the drive device 8 is operated, the stirring shaft 6 and the cutter 10 are connected to each other.
are rotating at the same time. A slurry agent discharge hole 11 is located in front of the cutter 10, and is configured to discharge the slurry agent sent from inside the starting side shaft.

At the inner upper part of the excavator main body 1, that is, between the inner cylinder 1a and the outer cylinder 1b, an earth and sand pumping cylinder 12 is supported by both and is slidable.
It can be directly connected to the earth and sand pumping pipe 13 located at the rear. A piston 14, which is slidable within the earth and sand pumping cylinder 12, protrudes from a hydraulic jack 15 supported by the inner cylinder 1a. These earth and sand pumping cylinder 12, earth and sand pumping pipe 13, piston 1
4 and the hydraulic jack 15 constitute the earth and sand pumping device in this embodiment.

Further, an appropriate space is secured between the partition wall 7 and the end of the inner cylinder 1a, and this space constitutes a soil chamber 16, which is transported rearward as the excavator main body 1 advances. The excavated soil is blocked by the partition wall 7 and remains under pressure in the soil chamber 16.

Then, the earth and sand pumping cylinder 12 slides,
A lattice-shaped screen 18 is provided between the sliding space when directly connected to the earth and sand pumping pipe 13, that is, between the intake chamber 17 located above the earth and sand chamber 16, and the earth and sand chamber 16, is prevented from flowing into the intake chamber 17 by this screen 18.

On the other hand, in the lower part of the earth and sand chamber 16, an opening 19 is provided which leads to the outside of the excavator main body 1, that is, the part that becomes the ground during excavation. Further, a protruding plate 20 is provided on the outer periphery of the excavator main body 1 in front of the opening 19. This embodiment is configured as described above.

To explain the working situation of the embodiment, when the excavator main body 1 is propelled from the shaft into the soil by a separately installed main pusher jack (not shown) while operating the drive device 8, the slurry is discharged from the slurry agent discharge hole 11. While the agent is being discharged, the cutter 10 rotates to cut the ground in front of it, and the resulting excavated soil is sufficiently mixed by the stirring protrusion 5 of the stirring shaft 6, causing the excavator main body 1 to move forward. Therefore, it is transferred to the rear soil chamber 16.

The excavated soil that has reached the soil chamber 16 is mixed one after another as the excavator main body 1 moves forward.
Pressure is gradually applied by the subsequent excavated soil that is transferred, and at this time, relatively large diameter earth and sand are discharged from the opening 19 to the outside of the excavator main body 1.

On the other hand, the earth and sand rising due to the pressure passes through the screen 18 and flows into the intake chamber 17, and as the outer cylinder of the earth and sand pumping cylinder 12 slides toward the earth and sand pumping pipe 13, the earth and sand in the intake chamber 17 is removed. incorporate into itself. After that, when the piston 14 is completely directly connected to the earth and sand pumping pipe 13, the piston 14 is pushed out by the hydraulic jack 15, and the taken-in earth and sand is pushed out into the earth and sand forcing pipe 13 and discharged to the rear.

On the other hand, the excavated soil discharged from the opening 19 into the ground enters the surplus excavation created by the direction correction and fills the surplus excavation. Therefore, there is no risk of ground subsidence.

In addition, in this embodiment, a protruding plate 20 is separately provided below the excavator main body 1 and in front of the opening 19, so even if there is no additional excavation due to direction correction,
This protruding plate 20 creates a clearance below the excavator main body 1, and the earth and sand discharged from the opening 19 fills this clearance. Therefore, the discharge of earth and sand from the opening 19 is not delayed.

(Effects of the Invention) According to the present invention, since a stirring shaft with no directionality in rotation is employed, the cutter can be rotated forward or reversed, and rolling correction can be easily performed. Further, due to the mixing effect of this stirring shaft, the viscous material and the excavated soil are well mixed, resulting in properties suitable for earth and sand pumping.

In addition, since the earth and sand pumping means is installed at the top of the excavator main body, the gravel falls downward, so that so-called "gravel jamming" does not occur, and the mixing effect of the above-mentioned stirring shaft and dust collection are good. This makes it possible to transport soil under pressure.

Furthermore, since an opening is provided at the bottom of the earth and sand chamber, part of the excavated earth and sand and gravel can be discharged into the ground, thereby reducing the amount of discharged earth and sand, and reducing the burden on the earth and sand pumping device. At this time, the earth and sand discharged from the opening fills the excess excavation, so there is no risk of ground subsidence, and the work can be carried out safely.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of the embodiment. In the figure, 1 is the excavator main body, 6 is the stirring shaft, 7 is the partition wall, 8 is the drive device, 10 is the cutter, 12 is the earth and sand pumping cylinder, 13 is the earth and sand pumping pipe, 14 is the piston, 15 is the hydraulic jack, 16 is a sand chamber,
19 is an opening.

Claims (1)

[Claims] 1. A stirring shaft is rotatably installed in the earth and sand transfer path inside the excavator body, and a soil chamber,
An earth and sand pumping device is provided above the earth and sand chamber, an opening leading to the outside of the excavator body is provided below the earth and sand chamber, and the stirring shaft is coaxial with or directly connected to the cutter rotating shaft. An agitating excavator.