JPS6263799A - Method of propulsion construction - 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] <Field of application of the invention> The present invention relates to a propulsion method.

<Conventional technology> Conventionally, there is a propulsion method as shown in Figure 4.5.

That is, the pilot pipe P is forced into the pond from the starting shaft A by the jack B, and is once penetrated to the reaching shaft C.

Next, a widening head D is attached to the tip of the pilot pipe P, and the pilot pipe P is pushed back from the arrival shaft C toward the starting shaft A, contrary to the previous step.

This pushing back can be carried out by fixing a fume pipe H to the pilot pipe P and pressurizing this fume pipe H with a jack in the reaching shaft II.

Problems to be solved by the present invention> The above conventional techniques have the following problems.

<B> It is necessary to penetrate the arrival shaft once and then return to the starting shaft again.

Adopting these two steps obviously requires a long construction time and is uneconomical.

Kuguchi: The starting shaft requires various equipment, so it is inevitable that it will be large.

However, with this construction method, it is necessary to suspend the Huyum pipe from the arrival shaft, so it is not only necessary to suspend it from the starting shaft.
The reaching shaft must also be large.

Therefore, in construction work in cities where land is scarce, securing land for large reaching shafts is a major problem.

<Objective of the present invention> The present invention was made in order to improve the above-mentioned problems, and an object thereof is to provide the following propulsion method.

<A> Construction method that can be completed with only one construction from the starting shaft to the arrival shaft <Explanation> Construction method that does not require a large arrival shaft <Configuration of the present invention> Next, equipment used in the method of the present invention An example will be described.

〉 Mouth Expansion Head The mouth expansion head 1 is a conical cylinder, and has a shape in which a central cylinder 11 for storing a down-the-hole drill 3 is provided in the center of the tip thereof and projects forward.

Then, an intake port 13 is opened in the conical surface 12 of the widening head 1 to take in small pieces of crushed boulders and earth and sand.

A storage chamber 14 for storing earth and sand is formed as a space on the back side of the conical surface 12.

A hollow drive shaft 21 is provided at the center of the back surface of the storage chamber 14 to rotate the mouth enlarging head 1 .

Inside the drive shaft 21, the earth removal screw 2 is rotatably housed coaxially with the down-the-hole drill 3 in the center tube 11.

Further, a ring 15 for supporting the hume tube H is provided around the back surface of the storage chamber 14 in an annular manner.

Down-the-hole drill A down-the-hole drill 3 is housed inside the central tube 11 of the opening enlargement head 1.

As this dow leather hole drill 3 itself, a known one can be used.

The above-mentioned earth discharge screw 2 is attached to the rear of the down-the-hole drill 3, so that the earth and sand introduced into the storage chamber 14 can be discharged to the starting shaft A at the rear.

Operation of the Present Invention A: The eight groups of hume tubes are connected within the ring 15 of the propulsion widening head 1, and the rear ends of the eight groups of hume tubes are pressurized by a jack J to push them into the ground.

Crushing and Intake Crush the boulders and the like in the center of the opening head 1 using the down-the-hole drill 3.

Surrounding pebbles, sand, earth and sand, small pieces after crushing, etc. are taken into the storage chamber 14 from the intake port 13 and sent to the soil discharge screw 2.
Discharge with.

KUHA〉Propulsion starts from the starting shaft A, and the widening head 1 penetrates the reaching shaft C.

Since the enlarged head 1 is followed by the hume pipe H, the conduit is completed when the enlarged head 1 penetrates.

Effects of the Present Invention> Since the present invention is as described above, the following effects can be expected.

Gui〉 When the expansion head propelled from the starting shaft penetrates the destination shaft, the pipeline will be completed at that point, since the expansion head is followed by a group of Huyum pipes.

Therefore, unlike the conventional method, there is no need to propel the shaft in the opposite direction to the starting shaft again after reaching the starting shaft, so the construction period can be significantly shortened and the work can be completed at low cost.

The reaching shaft is used only to pull up the expanded head that has arrived, and does not require a propulsion device in the opposite direction or a space for lowering the humid pipe.

Therefore, the land required for installing the reaching shaft can be constructed with a minimum amount of space.

Kuha〉A down-the-hole drill is installed in the center of the mouth expansion head.

If this is attempted to dig only with the expanding head, the destructive force of the bit of the expanding head depends on the circumferential speed of rotation, so it will be impossible to crush boulders etc. in the center part where the rotational speed is low.

For this purpose, the apparatus of the present invention employs a method in which a preceding down-the-hole drill is positioned in the center of the device to first perform primary crushing of the center and then take in the material.

Therefore, even in geological strata with many boulders, which could not be carried out using conventional expanding heads, it is now possible to carry out construction for the first time by pushing the expanding head into the ground.

[Brief explanation of the drawing]

Fig. 1: A perspective view of an embodiment of the aperture expanding head used in the construction of the present invention Fig. 2: Its sectional view

Claims (1)

[Claims] A propulsion method in which an expansion head with a down-the-hole drill located in the center and a group of Hume pipes following the expansion head are press-fitted into the ground from a starting shaft to a destination shaft.