JP3468870B2 - Self-propelled drilling machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-propelled punching machine, and more particularly to a self-propelling punching machine in which the frictional resistance between the outer peripheral surface of the self-propelling punching machine and the drilling can be arbitrarily adjusted.

[0002]

2. Description of the Related Art When burying a relatively small diameter gas or water conduit or underground cable in the ground, there is a method of excavating a trench along the entire length of the conduit or cable. There is a problem that it becomes expensive. Therefore, as shown in FIG. 5, the solid piles 101 and 102 are excavated at two locations corresponding to the starting end portion and the terminating end portion of the conduit or cable, and self-propelled from the rigid pile 101 on the starting end side to the rigid pile 102 on the terminating end side. A method called a non-excavation method in which the perforation 104 is formed by the perforation machine 103 has been proposed.

The punching machine 103 prevents reverse movement by receiving a reaction force during propulsion in the soil, and is of a pneumatic type that uses compressed air as a driving fluid.
There is a hydraulic type that uses pressure oil as a driving fluid. The punching machine 103 always generates a reaction force according to the striking force during propulsion. This reaction force is applied to the casing outer peripheral surface 105 of the punch 103.
Since it is necessary to support it by the frictional resistance generated between the boring machine 104 and the boring machine 104, the size of the boring machine on the market is the pneumatic type, the outer diameter is φ45 mm to φ180 mm, and the total length is 1000 m.
m-2000mm, and the main model φ100mm is 1
It has a length of 500 mm to 1600 mm and has a very long overall length.

Further, in order to support the reaction force, as shown in FIG. 6, there is also on the market a casing outer peripheral surface 205 of the punching machine 203 having a saw-toothed blade shape for soft soil.

[0005]

If the whole length is long, the hard soil will cause excessive frictional resistance on the outer peripheral surface of the boring machine, and the impact force will be consumed to reduce the propulsion speed. In addition, the weight of the punching machine increases due to the longer time, and the transmission efficiency of the striking force decreases, which further affects the propulsion speed. In a punching machine with a saw blade on the outer peripheral surface of the casing, it is effective in places with soft soil because the saw blade causes resistance to bite into the soil, but in places with tight soil there are obstacles such as gravel in the front. In that case, biting does not occur, and since the contact area with soil is also reduced, the reaction force generated may not be supported even if the striking force is increased, and it may be impossible to propel.

[0006]

In view of the above circumstances, the present invention provides a self-propelled drilling machine for use in burying gas / water conduits or underground cables by a non-open cutting method. It is formed of an elastic body having a cylindrical shape on the outer periphery of the formula drilling machine, tread, such as a plurality of grooves on the outer peripheral surface
A self-propelled punching machine is provided in which a resistance bag provided with a cord is arranged, and the resistance force between the resistance bag and the perforations can be arbitrarily adjusted by expanding and contracting the resistance bag in the radial direction.

[0007]

[Operation] A self-propelled punching machine having a resistance bag formed of an elastic body that can be expanded in the radial direction as needed by remote control or can be expanded in advance to increase the resistance to the drilling. By offering
The overall length of the drilling machine will be shorter than before, and it will be possible to improve or accelerate the propulsion speed for soft soils, soils containing a lot of water, soils with obstacles such as gravel, etc. be able to.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on specific embodiments shown in the accompanying drawings. FIG. 1 is an external view of the entire self-propelled punching machine according to the embodiment of the present invention. The detailed internal structure of the rear part 2 of the self-propelled punch 1 shown in FIG. 1 is shown in FIG. An annular groove mounting portion 5 for mounting the resistance bag 4 is formed on the inner surface of the rear portion of the casing 3 on the outer periphery of the punching machine 1. The resistance bag 4 is formed of a cylindrical elastic body in which the bead portions 6 and 7 are swelled up and down.

The elastic body of the resistance bag 4 may be made of a material having elasticity and a high coefficient of friction, and may be made of natural or synthetic rubber or the like. It can also be reinforced by inserting wires and the like. A sleeve 10 is provided inside the casing 3, and a working fluid passage 1 serving as a passage for a fluid necessary for operating a pneumatic or hydraulic punching machine is provided inside the sleeve 10.
An expansion fluid passage 13 for supplying / discharging a fluid such as a gas to / from 1 and 12 and the resistance bag 4 is provided. Also, the sleeve 10
Working fluid ports 14 and 15 and an expansion fluid port 16 are provided on the rear end face.

The front bead portion 6 of the resistance bag 4 is the casing 3
The rear bead portion 7 is mounted on the mounting portion 18 of the annular groove on the inner surface of the ring-shaped mounting bracket 17, and the mounting bracket 17 is externally fitted into the rear cylindrical portion 19 of the sleeve 10. The nut 20 is screwed and fixed. Nitrogen gas is usually used as the fluid supplied to the expansion fluid chamber 21 formed between the inner surface of the resistance bag 4 and the outer surface of the sleeve 10. In this case, the nitrogen gas filled in the cylinder from a position remote from the punching machine 1 is supplied to the expansion fluid port 16 through the pressure reducing valve. If this fluid is a pneumatic punch,
It is also possible to branch from the middle of the air pipe connected to the working fluid port 14 and connect to the expansion fluid port 16 via a pressure reducing valve to supply air. In the case of a hydraulic drilling machine, the hydraulic pipe connected to the working fluid port 14 may be similarly connected to the expansion fluid port 16 to supply the hydraulic pressure.

Normally, the pressure of the expansion fluid chamber 21 of the resistance bag 4 is atmospheric pressure. In that case, the outer diameter of the resistance bag 4 is formed to be slightly smaller than the outer diameter of the casing 3 of the punching machine, and the resistance bag 4 does not swell unless pressure is applied, so that it does not come into contact with the perforations. During the propulsion of the punching machine 1, it becomes difficult to propel the impact reaction force on the outer peripheral surface of the punching machine 1, unlike the water content of soil around the punching machine 1 and the degree of inclusion of obstacles such as gravel. This is when it becomes difficult. In such a case, the resistance bag 4 expands in the outer diameter direction by operating the pressure from the expansion fluid chamber 21 of the punching machine 1 to a certain extent by remote control, and the outer peripheral surface 8 of the resistance bag 4 comes into contact with the drilling.
Friction resistance depending on the supply pressure is generated between the punching machine 1 and the punching machine to improve or propel the propulsion speed. Particularly, in a place where the soil is compacted and there is an obstacle such as gravel in front of the punching machine 1, the reaction force generated even if the impact force of the punching machine 1 is increased by increasing the supply pressure so that a sufficient frictional resistance force is generated. It is possible to support and to crush obstacles.

Further, FIG. 2 shows a cylindrical resistance bag 4, but as shown in FIG. 3, by providing a plurality of grooves or other treads 9 on the outer peripheral surface 8 of the resistance bag 4, a further propulsion effect can be obtained. can get. It should be noted that a substantial propulsion speed can be obtained by preliminarily enclosing the pressure of the expansion fluid chamber 21 and inflating the resistance bag 4 to some extent without remote control in a place where the soil quality is relatively unchanged.

As described above, by utilizing the function of the resistance bag 4, a resistance force corresponding to the soil quality can be created, so that the total length of the punching machine 1 can be made shorter than before, which has been difficult to drive conventionally. The propulsion speed can be improved or can be promoted with respect to the soil quality. The resistance bag 4 is the punch 1
Not only the rear portion 2 but also the front portion and the central portion can be provided, and a plurality of them can be provided as necessary.

Next, another embodiment of the present invention is shown in FIG.
explain. A female screw 31 is engraved on the inner surface of the casing 30 of the punching machine 1, and a sleeve 32 is housed inside the casing 30 and connected by the female screw 31. The sleeve 32 has working fluid passages 33 and 34 in the same manner as the above-mentioned example, and working fluid ports 35 and 36 are provided on the rear end surface of the sleeve 32.
Is provided. In addition, the outer peripheral surface 3 of the rear portion of the sleeve 32
Reference numeral 7 is formed in a tapered shape, and a split sleeve 38 divided into a plurality of circumferences is arranged on the outer side thereof, and a collar 39 is projectingly provided on the rear portion thereof. A resistance bag 40 according to the present invention is attached to the outside of the split sleeve 38. The resistance bag 40 is formed of a cylindrical elastic body, and its shape and material are shown in FIG.
This is the same as that described in FIG. Working fluid port 35.3
When the operator rotates the hose connected to 6, the sleeve 32 is moved back and forth, and the split sleeve 38
Can be moved in the radial direction to expand and contract the resistance bag 40, and the resistance bag 40 can generate an arbitrary frictional resistance between the resistance bag 40 and the perforation. In addition to fluid, the resistance bag 40 can be driven by mechanical means in this way.

[0015]

INDUSTRIAL APPLICABILITY The present invention is a self-propelled punching machine used when burying a gas / water supply conduit or an underground cable by a non-excavation method. Is formed and there are no multiple grooves on the outer peripheral surface.
A self-propelled punching machine in which a resistance bag provided with any tread is arranged and the resistance force between the resistance bag and the perforations can be arbitrarily adjusted by expanding and contracting the resistance bag in the radial direction. Therefore, since the total length of the punching machine can be made shorter than before, the weight can be reduced and the transmission efficiency of the striking force is also improved.

Further, the present invention improves the propulsion speed or enables propulsion for soft soils, soils containing a large amount of water, soils having obstacles such as gravel, etc. The reliability of the product in hole construction is improved.

[Brief description of drawings]

FIG. 1 is an external view of an entire self-propelled punching machine according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a main part of the present invention.

FIG. 3 is a vertical cross-sectional view of another embodiment of the resistance bag of the present invention.

FIG. 4 is a vertical cross-sectional view of another main part of the present invention.

FIG. 5 is an explanatory diagram of a punching operation by a self-propelled punch.

FIG. 6 is an external view of a conventional self-propelled punching machine.

[Explanation of symbols]

1 ... Self-propelled punch 4.40 ... Resistance bag 11. 12, 33, 34 ... Working fluid passage 13 ... Expansion fluid passage 21 ... Expansion fluid chamber 32 ... Sleeve 38 ... Split sleeve

Claims (5)

(57) [Claims] 1. A self-propelled drilling machine used for embedding by trenchless method and gas, water conduits or underground cables, are formed of an elastic body having a cylindrical shape on the outer periphery of the self-propelled drilling machine, the outer periphery There are multiple grooves on the surface.
A self-propelled perforator in which a resistance bag provided with a cord is arranged and the resistance force between the resistance bag and the perforations can be arbitrarily adjusted by expanding and contracting the resistance bag in the radial direction. 2. The self-propelled punching machine according to claim 1, wherein the resistance bag is radially expanded and contracted by a fluid. 3. The self-propelled punching machine according to claim 1, wherein the expansion and contraction of the resistance bag in the radial direction is performed by mechanical means. 4. The self-propelled punching machine according to claim 1, wherein expansion and contraction of the resistance bag in a radial direction are performed by remote control. 5. The self-propelled punching machine according to claim 1, wherein the expansion and contraction of the resistance bag in the radial direction is directly performed.