JPS6332092A - Underground drilling apparatus - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to an underground excavation device, and particularly to an underground excavation device equipped with an air hammer and used for excavating rocks and the like.

(Prior Art) Conventionally, when burying steel pipes or the like underground, an underground excavation device has been used that buries the pipe while excavating a horizontal hole in the ground.

However, since the structure of this underground excavation equipment is a full-section crushing method, if the ground in which the pipe is buried is in a stratum containing bedrock, it is necessary to use a screw auger or a sewage pressure pipe to transport the rock. The waste must be finely pulverized to particles that can pass through the pipe or the diameter of the wastewater pipe before being sent later.

(Problems to be solved by the invention) In the above-mentioned excavation equipment, if it hits boulders, large gravel, driftwood, etc., it may be impossible to dig, or even if it is possible, it will be difficult. Moreover, when crushing rocks and the like into appropriate sizes, the cutting edge wears out rapidly. Therefore, the cutting edge needs to be replaced, but since replacing it is troublesome, countermeasures have been taken such as increasing the weight of the cutting edge to make it stronger, or digging with a smaller diameter and enlarging the hole. Problems such as increased costs and excessive construction costs for excavation could not be resolved.

In view of this, the present invention adopts a hollow method in which the cutting edge structure is circumferentially excavated, and the circumferential part is excavated with a diameter larger than that of the buried pipe using the excavation head, and the boulders, rock, etc. contained therein are automatically excavated in the hollow. To solve the drawbacks of the conventional technology by providing an underground excavation device that not only advances the excavation, but also crushes large rocks using an auxiliary excavation head installed in the hollow when large rocks are encountered during excavation. It was done with that purpose in mind.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an underground excavator having a leading pipe of a casing that can be inserted into the inside of a buried pipe and having an excavation head on the front side. A hammer rod having an auxiliary drilling head at its tip is provided in the casing at an angle with respect to its axis, and the auxiliary drilling head is provided to be extendable and retractable from the hammer rod, and the auxiliary drilling head is able to extend and retract from the hammer rod. The present invention is characterized by an underground excavation device positioned eccentrically with respect to the axis so as to protrude beyond the outer circumferential surface of the leading pipe.

(Function) With this configuration, the auxiliary milling head can be moved eccentrically from the hammer rod, which is installed at an angle with respect to the axial center of the casing, as needed, to adjust the outer diameter of the leading pipe. It is possible to excavate the excavation head more protrudingly, and to retract the auxiliary excavation head to accommodate the excavation head within the casing.

(Example) The present invention will be described below with reference to the example shown in FIGS. 1 to 4.

The hollow type underground excavator to which the present invention is applied, as shown in the cross section of an example in Fig. The casing 4 in which the lead pipe 5 is arranged is moved to the buried pipe 3 by a plurality of rollers 6.
It is rotatably supported inside and slidably in the front and rear directions.

The driving source for digging the buried pipe 3, casing 4, etc. is
A geared motor 7 transmits power from the motor 7 to a propulsion jack 8 via a chain or the like, and the operation of the propulsion jack 8 performs lateral machining.

On the front side of the buried pipe 3, there is an excavation head 9 provided on the circumferential surface of the leading pipe 5, whereby the circumference is excavated. Inside the casing 4, a hammer rod 10, which is the essential part of the present invention, is provided with an auxiliary excavation head 11 at its tip, inclined with respect to the axis. The earth and sand excavated by the excavation head 9 is discharged from the leading pipe 5, through the casing 4, and from an outlet (not shown).

In this case, the auxiliary drilling head 11 is used to crush large rocks etc. when encountered.

In the figure, 12 is a cutting hose, 13 is a main power cabtyre cord 14 is an air hammer driving motor, and 15 is a cutting hydraulic hose.

The present invention relates to the front head portion shown in FIG. 1, and its details are shown in enlarged view in FIGS. ) is provided with a stepped and long hammer rod 10, which is supported by a pair of O-rad guides 1 and 18 at the front and rear near the ends.

The retractable auxiliary drilling head 11 is provided at the tip of the hammer rod 10.
A known air hammer (not shown) is built in at a position close to the auxiliary excavation head 11, and the auxiliary excavation head 11 moves in the direction of the arrow () by the operation of this air hammer.
As shown in (a) and (b), the rotary tapping motion is performed by moving back and forth.

Note that air in this case is supplied from the inlet 19 at the rear end of the hammer rod 10.

Next, the effect will be explained.

First, when the excavation head 9 attached to the front circumference of the leading pipe 5 rotates with the rotation of the leading pipe 5 and excavates, there is no problem if the digging progresses smoothly, but if the head is severely damaged, it may cause boulders or rock formations. When encountering a hard area, especially in a rocky area, if you continue to move forward, the head may avoid the hard area and turn to a soft area, causing you to lose your ability to travel straight.

In such a case, the auxiliary excavation head 11 is extended and advanced further than the excavation head 9, and the casing 4 is slowly rotated to a position where it protrudes outward from the outer periphery of the leading pipe.

At this time, the auxiliary excavation head 11 is rotated and the rock is struck with a hammer to crush it, and the excavation head 9 excavates the circumference.

If the area around the excavation head 9 is hard rock, the casing 4 may be gradually rotated and the auxiliary excavation head 11
While hitting the bedrock, it shatters the surrounding area.

There are various types of hammers in this case, but there are 10 types.
A value of about 0 to 200 am is effective.

The above example is mainly used when the construction work is performed on unpredictable soil, or when striking rocks with boulders, etc. that change frequently.

FIG. 4 shows another embodiment used when excavating or crushing the soil of a cemented carbide platform and proceeding with C, in which tricone pits 20 are arranged around the outer periphery of the leading pipe 5, and the tricone pits 20 are rotated for excavation. The apparatus is equipped with an auxiliary excavation head 11 according to the present invention, and the same reference numerals are used for parts common to those in FIG.

Therefore, when the excavation direction is obstructed by a carbide table, boulders, uneven distribution of rock, etc. while working with the tricone pit 20 and the excavation head 9, the auxiliary excavation head 11 according to the present invention can be used in that area. It can be crushed by impact to enable excavation.

(Effects of the Invention) As described above, the present invention provides an underground excavator having a leading pipe of a casing that can be inserted into the inside of a buried pipe and having a drilling head on the front side. On the other hand, since the hammer rod with the auxiliary drilling head at the tip is installed at an angle, and the auxiliary drilling head is provided to be more flexible than the hammer rod, the wear of the cutting edge with the hollow method is significantly greater than with the conventional full-section crushing method. Decrease. In addition, if a large rock is encountered during excavation, even if it is not possible to excavate with just the circumferential part of the excavation head, the auxiliary excavation head is extended further forward than the excavation head in front of the leading pipe, and the rock is removed with an air hammer. Since it is possible to excavate after crushing, there is no problem with the conventional method where the equipment itself avoids the rock when excavating, and it is possible to excavate 1q as planned.

Therefore, the excavation \a[f is improved, and the present invention significantly reduces the severe wear of the excavation head that occurs when only the excavation head is used.

Furthermore, the auxiliary excavation head is installed at an angle with respect to the axis of the casing, and when it is protruded from the front of the excavation head, it is in an eccentric position with respect to the axis, so when the casing is rotated, the entire area except the center is excavation becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing an example of an underground excavation device to which the present invention is applied, FIG. 2 is a front view of the main parts of the present invention, FIG. 3 is a vertical side view of the same, The figure is a partially sectional side view of an underground excavation device when the present invention is used in combination with a tricone pit. 3... Buried pipe, 4... Casing, 5... Leading pipe, 9... Drilling head, 10... Hammer rod, 1
1... Auxiliary drilling head, 16... Axis center.

Claims (1)

[Claims] It has a leading pipe of the casing that can be inserted into the inside of the buried pipe,
In an underground excavator having a drilling head on the front side, a hammer rod having an auxiliary drilling head at its tip is installed in the casing at an angle with respect to its axis, and the auxiliary drilling head is extendable and retractable from the hammer rod. An underground excavation device, wherein the auxiliary excavation head is eccentrically positioned with respect to the axis so as to protrude beyond the outer circumferential surface of the leading pipe by extension.