JPH02186098A - Shield construction method and excavator used in propulsion construction method - Google Patents

Abstract

PURPOSE:To permit the efficient excavation by revolving a conical screw body on the surface of which a spiral groove is cut and a hollow rotary body which is connected behind the screw body and charged with the muddy soil, thus reducing the soil pressure resistance. CONSTITUTION:Behind a conical screw body 2 on the surface of which a spiral groove 21 is cut, a hollow rotary body 3 charged with muddy soil 7 is connected, and a hume pipe 6 is connected behind the rotary body 3. The hume pipe 6 is advanced by a jack, and the screw body 2 and the hollow rotary body 3 are turned by a motor 11. Further, the soil and sand which are excavated by the screw body 2 are sent behind by the spiral groove 21, and a portion is taken into the hollow rotary body 3 from a soil/sand taking-in window 31. Further, when the muddy soil 7 in the hollow rotary body 3 are hardened, the muddy soil 7 is replaced through a mud feeding pipe 4 and a mud discharge pipe 5.

Description

[Detailed description of the invention] Industrial application field> The present invention relates to an excavator used in the shield construction method and the propulsion construction method.

Problems to be Solved by the Present Invention In shield construction methods, propulsion construction methods, etc., an excavator may be attached to the tip of a shield device or hump pipe to perform excavation.

However, in conventional excavators, the front surface of the excavator is a plane perpendicular to the excavation direction.

As a result, the front of the excavator faces extremely large resistance, making it difficult to excavate efficiently.

Particularly in the case of the propulsion method, the entire long connected hump pipe is pushed by a jack from the shaft side, which limits the propulsion force of the jack and makes it impossible to extend the length.

In addition, when propelling through a gravel layer, there is a risk that the Huyum tube may run up on boulders and become bent, or the tube may become blocked, making propulsion difficult.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and is an excavation method used in the shield method and propulsion method, which can efficiently excavate all types of ground including gravel layers. The purpose is to provide a machine.

Configuration of the Present Invention> (Fig. 1.2) An embodiment of the present invention will be described below with reference to the drawings.

In this embodiment, a case will be described in which the excavator 1 is attached to a hump pipe used in the propulsion method.

〉Screw integrated screw 2 is a conical excavating member with a spiral groove 21 carved on its surface.

The screw unit 2 is rotatably attached to the front surface of the hume pipe 6, with the tip thereof facing the direction of excavation.

In order to rotate the screw unit 2, a motor 11 is installed inside the hume tube 6, and the screw unit 2 is attached to the rotating shaft of the motor 11.

Exit> Hollow rotating body The hollow rotating body 3 is a hollow drum-shaped member, and is rotatably mounted on the rotating shaft of the motor 11 at the rear of the screw unit 2.

The inside of this hollow rotary body 3 is filled with mud 7, and in order to take in the earth and sand excavated by the screw unit 2,
Sediment intake window 31 will be opened.

The mud 7 is made of butter-like hardness and is filled completely inside the hollow rotary body 3 so that excavated boulders and the like can easily fall in, but earth and sand with a fine particle size cannot fall in.

By filling the hollow rotating body 3 with mud 7, it also serves to relieve stress if the ground is restrained thickly during excavation.

The earth and sand intake window 31 needs to be large enough to prevent the mud 7 inside from flowing out and to take in the excavated earth and sand.

Mud transport means While excavating, if the mud 7 inside the hollow rotary body 3 becomes hard (mixed with earth and sand) and cobbles etc. become depressed, the excavated soil and mud will be removed from the inside of the hollow rotary body 3. It is necessary to suction the mixture of 7 and to supply a new amount of mud 7 to the inside of the hollow rotary body 3 in an amount exceeding the suction amount.

Therefore, as a mud feeding and draining means, for example, a mud feeding port 32 and a mud draining port 33, which can be opened and closed, are provided on the surface of the six fume pipes of the hollow rotating body 3, and from there, the mud feeding pipe 4 and the mud draining pipe 5 are rotated through the hollow rotating body. It is conceivable to insert it into the body 3 and suck and supply it with a pump.

Excavation method according to the present invention (Fig. 2) Next, an excavation method using the apparatus of the present invention will be explained.

<A> Taking in earth and sand The fume pipe 6 is propelled by a jack, and the integrated screw 2 and the hollow rotating body 3 are rotated.

The earth and sand is then sent to the rear through the spiral groove 21 as shown by the arrow.

A part of the earth and sand sent to the rear part is taken into the hollow rotary body 3 through the earth and sand intake window 31 of the hollow rotary body 3, and the remaining excavated earth and sand escapes to the side.

Exit> Replacing the mud When the mud 7 inside the hollow rotating body 3 becomes hard, stop the rotation and remove the mud 7 inside from the mud feeding pipe 4 and the mud draining pipe 5 as described above.
and then start drilling again.

In addition, if the mud feeding pipe 4 and the mud draining pipe 5 are attached to the hollow rotating body 3 by a swivel mechanism, the mud 7 can be exchanged even while rotating, which further improves efficiency.

<Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

<B> Conventional excavators used in the shield method and propulsion method have a flat surface that is perpendicular to the direction of excavation, so the front face of the excavator receives extremely large soil resistance, making it difficult to excavate efficiently. is difficult.

However, the present invention uses an integrated screw with a sharp tip.
Excavate earth and sand.

Therefore, there is almost no earth pressure resistance on the front of the excavator.
Can be dug efficiently.

In the present invention, there is almost no earthwork resistance on the front of the excavator, so in the case of the propulsion method, there is a margin for the propulsion force of the jack who pushes the humid pipe from the shaft side, and the extension of the humid pipe can be made longer. can do.

In addition, when propelling through a sand and gravel layer, there is no risk that the Huyum tube will ride on boulders and bend the tube, or that the tube will be blocked and the propulsion becomes difficult.

<C> Only a portion of the excavated earth and sand needs to be taken in; the remaining earth and sand will escape to the sides.

Therefore, it is not necessary to treat all the earth and sand, which is economical.

Figure 1: Explanatory diagram of one embodiment of the present invention FIG. 2 Cross-sectional view of the device of the present invention

[Brief explanation of the drawing]

Claims (1)

[Claims] (1) An excavator that is attached to the tip of a shield device or the tip of a Hume pipe used in propulsion methods, and has a conical rotating body with a spiral groove attached to the front of the excavator, and a A shield construction method characterized by comprising a hollow rotary body whose inside is filled with mud and has a window for taking in the excavated soil, and a mud feeding/draining means for filling the hollow rotary body with mud and discharging it. and excavators used in propulsion methods.