JPS6272895A - Soil discharge method and apparatus in propelling construction method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an earth removal method and an earth removal apparatus in a propulsion method.

(Conventional technology) There is a conventional propulsion method shown in Figure 3.4.

In other words, this construction method begins with the starting shaft 1.
2, the pilot pipe 3 is press-fitted into the ground, and it is temporarily penetrated to the vertical shaft 4.

Next, using the pilot pipe 3 as a guide material, the hump pipe 5 is pushed from the reaching shaft 4 side toward the starting shaft 1 side using the jack 21.

At this time, propulsion is performed via a hole-expanding head 6 that serves as a digging blade between the hume tube 5 and the pilot tube 3.

Then, the earth and sand taken into the hole-expanding head 6 is discharged to the starting shaft 1 side by a screw conveyor 7 inserted into the pilot pipe 3.

Problems to be solved by the present invention> The above-mentioned propulsion method has the following problems.

(r) The propulsion ground is I! In the case of 3J water, an aquifer, etc., water enters into the hole-expanding head 6.

However, since no water means is provided in the middle of the hole-expanding head 6, the water that has entered the hole-expanding head 6 will flow into the pilot pipe 3.
It flows out into the starting shaft 1 after passing through.

In particular, when the propulsion of the hole-expanding head 6 is stopped, the amount of spring water is large (as a result, a separate drainage facility for treating the spring water is required in the starting shaft 1).

(b) If free drainage is allowed in the propulsion ground, the surrounding earth and sand will flow out along with the spring water, which may eventually cause the ground to loosen and subside.

<Objective of the present invention> The present invention has been made to solve the above-mentioned problems;
The object of the present invention is to provide a propulsion method and a propulsion device that can perform propulsion work safely while stabilizing the surrounding ground by blocking spring water depending on the geology of the propulsion ground.

<Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

First, a description will be given of the earth removal means when the hole-expanding head 6 is used to propel a large-diameter propulsion pipe such as the hume pipe 5.

Note that the process of propelling the pilot tube 3 prior to propulsion of the hume tube 5 is the same as before, so it will be omitted in this embodiment.

Figure 1 shows the state in which the hump pipe 5 is propelled from the arrival shaft 4 toward the starting shaft 1 after the pilot pipe 3 has penetrated.

In the figure, interposing a hole-expanding head 6 between a pilot pipe 3 and a fume pipe 5 is similar to the conventional construction method.

Furthermore, the earth and sand excavated by the bit 62 installed on the inclined peripheral surface 61 of the hole drilling head 6 is also transferred to the inclined surface 61 of the hole drilling head 6.
The process of taking soil into the internal space 65 partitioned by a partition wall 64 through the slit-shaped intake port 6:3 opened in 1, and then discharging it into the starting shaft 1 by the screw conveyor 7 inserted into the pilot pipe 3 is different from the conventional method. The same is true.

<Explanation>Constructional features of the present inventionHowever, the present invention is significantly different from conventional propulsion technologies.
The point is that the collection ff1 (amount of soil removed) of the earth and sand taken in by the screw conveyor 7 can be adjusted to zero or more.

The following method was adopted as a technical means to adjust the amount of soil to be collected.

<C> Means for adjusting the amount of collected earth and sand A cone material 8 is attached to the tip of the screw conveyor 7 that has reached the inside of the hole-expanding head 6.

By sliding the screw conveyor 7 relatively within the pilot pipe 3, a guide cylinder 66 that functions as an outer cylinder of the screw conveyor 7 within the hole-expanding head 6 is installed.
The opening end of the excavated soil can be completely closed or left open to adjust the amount of excavated soil discharged.

Therefore, when the hume tube 5 is being propelled and stopped, the screw conveyor 7 is operated as follows.

[During propulsion 1 (during excavation) When propelling the hump pipe 3, as shown in FIG.
Soil is removed while keeping the opening of the guide tube 66 located in the hole-expanding head 6 open.

That is, the earth and sand taken into the internal space 65 as the hole-expanding head 6 is propelled is collected by the screw conveyor 7 exposed between the open end of the guide tube 66 and the cone material 8, and reaches the shaft 4. The soil will be discharged to

Therefore, by adjusting the exposed length of the screw conveyor 7 in the internal space 65 depending on the water content of the excavated earth and sand, the amount of earth discharged can be freely adjusted.

[At Stop 1 (FIG. 2) When interrupting the operation of propelling the hume pipe 3, the screw conveyor 7 is slid in the earth removal direction and the opening of the guide tube 66 is closed with the cone material 8.

As a result, the earth and sand, spring water, etc. taken into the internal space 65 remain in the internal space 65 as they are, and do not flow out to the starting shaft 1 side via the hump pipe 3.

Effects> Since the present invention is as explained above, the following effects can be expected.

(B) A cone material capable of blocking the earth and sand intake was attached to the tip of the screw conveyor located inside the hole-expanding head.

Therefore, by sliding the screw conveyor, the amount of earth and sand collected by the screw conveyor can be freely adjusted.

In particular, since the amount of earth removed can be adjusted according to the water content of the propulsion layer, the propulsion work can proceed while stabilizing the surrounding ground.

(b) By blocking the intake port of the screw conveyor with cone material, it is possible to reliably block spring water flowing into the hole-expanding head.

Therefore, spring water is not discharged carelessly, and loosening of the ground and ground subsidence can be prevented, allowing safe propulsion work.

[Brief explanation of drawings]

Figure 1.2: Cross-sectional view of essential parts to explain the soil removal method according to the present invention Figure 3.4: Explanatory diagram of the prior art

Claims (2)

[Claims] (1) In a propulsion method in which a pilot pipe is press-fitted into the ground and penetrated, a large-diameter propulsion pipe such as a Hume pipe is propelled from the direction opposite to the propulsion direction of the pilot pipe, between the pilot pipe and the large-diameter propulsion pipe. A screw conveyor is slidably inserted into the pilot pipe, with a hole-expanding head interposed in the pilot pipe, and a cone material that can block the discharge path is attached to the tip of the screw conveyor and placed inside the hole-expanding head. Earth removal method in the propulsion method that adjusts the amount of soil removed (2) A device used in a construction method in which a large-diameter propulsion pipe, such as a Hume pipe, is propelled from the opposite direction of the propulsion direction of the pilot pipe after penetrating the pilot pipe into the ground by propulsion, and the pilot pipe and large-diameter propulsion are A hole-expanding head is interposed between the pipes, a screw conveyor is slidably inserted into the pilot tube, a cone material that can block the discharge path is attached to the tip of the screw conveyor, and the cone is placed inside the hole-expanding head. An earth removal device characterized by a structure in which the exposed length of the screw conveyor in the hole-expanding head can be adjusted by a sliding operation.