JPS58120987A - Mortising device - 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 The present invention relates to a drilling device used when laying a pipeline in the ground, and particularly to a drilling device for drilling a large diameter hole in bedrock.

Conventionally, when drilling a large-diameter horizontal hole in rock, there are methods that rotate the cutter to cut the rock, and methods that press the cutter against the rock without rotating and press the entire drilling head, including the cutter, against the rock. There is a method that drills holes by rotating, but this Seering machine method has the drawback that when it comes to hard rock, the cutter edge wears out significantly, resulting in poor drilling efficiency and high cost.

Conventionally, a method has been proposed in which the bit is struck and rotated using compressed air as the motive force, and the rock is crushed and drilled using a drill. This method is said to have a faster drilling speed and greater maneuverability than the Seering machine method described above, but on the other hand, as the diameter of the hole being drilled becomes large, V, where the bit diameter is proportionally larger,
In addition, a motive force with a large capacity is required to strike and rotate the bit, resulting in a large and expensive device.

The invention was devised in order to solve the above-mentioned drawbacks of the conventional technology, and it is possible to drill large-diameter holes in rock with a bit that is sufficiently smaller than the drilling diameter, and by this f'L, the bit power source can be reduced. The overall purpose of the present invention is to provide a drilling device that increases the capacity and downsizes the drilling means, and also enables drilling into rock that matches the diameter of the propulsion pipe.

In order to achieve this object, the drilling device according to the invention includes at least one striking head, which is entirely powered by compressed air, installed eccentrically in the entry end-side propulsion pipe that is propelled into the ground, and A bit with a diameter equal to or smaller than the radius of the propulsion tube is attached to the tip of the striking head, and the bit is given a blow from the striking head and the propulsion tube is propelled through a full rotation to effectively drill holes in the ground including rock. This is how it was done.

Hereinafter, embodiments of the invention will be described with reference to the drawings.

Fig. 1 shows an overall view of the case where the drilling device according to the invention is applied to laying a pipeline across the ground such as a ground made of rock. 90
0mm) propulsion tube, 2 is a striking head for general use installed eccentrically within the tip of the propulsion tube 1 on the side that enters the ground, 1, and the propulsion tube 1 including this striking head 2 is installed on the ground where it is laid. One shaft 4 of shafts 4 and 5 formed on both sides with 3 in between.
The shaft is propelled in a direction across the ground 3 toward the other shaft 5, and the propulsion operation is performed by a rotary propulsion device 6 installed in the one shaft 4. At the same time, the propulsion pipe 1 is It is rotated by a rotary propulsion device 6.

The rotary propulsion device 6 has a rotary propulsion unit 8 installed on a base 7 so as to be movable forward and backward. It has a built-in mechanism for rotating it (the eaves are not shown), and furthermore, the rotor 8 can be moved in the forward and backward directions by means of a hydraulic jack 9 such as air.

FIGS. 2 and 3 show details of the above-mentioned cutting head 2, which includes a cylindrical casing 10 fixed to the inner periphery of the tip of the propulsion tube 1 so as to be parallel to its axis, and a structure inside the casing 10. A chisel 11 is fitted into the casing 10 so as to be slidable in its axial direction so as not to rotate toward the front end, and an air hammer 12 is provided at the rear end of the casing 10 to strike the chisel 11. Hammer head 12a slidably supported by guide member 14
are facing n, this hammer head 12a f air hammer 1
A striking force is applied to the head 12a of the chisel 11 by operating the chisel 11 with compressed air supplied to the chisel 2. Further, a bit 15 having a diameter smaller than the radius (outer diameter radius) of the propulsion tube 1 is fixed to the front end of the chisel 11, and this bit 15 is provided to protrude from the open end surface ]a of the propulsion tube 1. L, and is further inscribed in the outer circumferential circle of the propulsion tube 1. In addition, 13ald foot valve, 13b
is a rigid valve.

Further, a compressed air supply hose 17 is connected to the rear end of the striking head 2 via a swivel joint 16, and this supply hose 17 is pulled out from the rear end of the propulsion tube 1.
It is connected to a compressed air supply source (compressor), not shown, installed on the ground or the like.

Next, the operation of the inventive device constructed as described above will be explained.

As shown in FIG. 1, a propulsion tube 1 equipped with a drilling striking head 2 having a bit 15 enters the ground 3 made of rock from the shaft 4 side in a horizontal direction across the ground 3. In a state where it is receiving rotation and propulsion force due to 6.

Compressed air from the compressor is transferred to hose 17. When the air hammer 12 is supplied via the swivel joint 16, the hammer 12 operates and its hammer head 12a strikes the head 11a of the chisel 11. For this reason, chisel 11
moves forward inside the casing 1o, and hits the bit 15 integrated with the drill against the rock in front of the opening of the propulsion tube, crushing the rock and sequentially drilling holes as the propulsion tube 1 moves forward. In this case, the impact crushing position of the rock by the pit 15 does not remain at the same location, but rotates around its axis in the direction of arrow A in Figure 3 together with the rotation of the propulsion tube l, and this causes propulsion. The rock within the area corresponding to the outer diameter of the tube 1 is partially hit and crushed in sequence, and the bit 15 makes one revolution as the propulsion tube 1 rotates, so that no hole corresponding to the diameter of the propulsion tube is drilled. I'm thinking of doing something. Also.

At the same time, the propulsion tube 1 also moves forward.

The propulsion tube 1 is drilled into the rock by the blow of the bit 15.
enters the ground, and if the propulsion pipe 1 remaining in one shaft 4 becomes short, a new propulsion pipe 1 is connected to the rear end of the propulsion pipe 1 that is being propelled all into the ground. Along with this, a hose 17 for supplying compressed air is also successively connected. Moreover, after the propulsion pipe l reaches the other shaft 5, the drilling-purpose striking head 2 is removed from the propulsion pipe l on the shaft 5 side,
And if you pull out hose 17.

The propulsion pipe 1 propelled into the ground is used as a conduit.

In addition, in the above embodiment, the awn<general-purpose striking head 2 and this
Although the case has been described in which there is one bit 15 that operates less than Vc, the present invention is not limited to this, and two or more bits 15 may be provided.

As described above, according to the present invention, at least one striking head powered by compressed air is installed completely eccentrically in the entry end-side propulsion pipe that is propelled into the rocky ground, and the striking head is A pit i with a diameter equal to or smaller than the diameter of the propulsion tube is installed at the tip of the bit, and by applying a blow to this bit from the striking head and rotating the propulsion tube, it is possible to drill holes in rock. because there is,
For this reason, even if a large-diameter hole is to be drilled in the ground made of rock, there is no need for a hole that matches the diameter of the drilled hole as in the conventional method.

The capacity of the striking head that strikes the bit has been reduced.

In other words, the device including the striking head and compressed air supply can be made smaller, and a highly mobile device can be easily provided. In addition, a hole with a diameter equivalent to the diameter of the propulsion tube is drilled with a relatively small blow while moving a bit with a diameter equal to the radius of the propulsion tube or smaller than the diameter n of the propulsion tube in a circular motion around its axis within the diameter plane of the propulsion tube. be able to.

[Brief explanation of drawings]

Figure 1 is an overall configuration diagram when the drilling device according to the invention is applied to laying pipes in rocky ground, and Figure 2 is the relationship structure between the drilling hitting head and the propulsion pipe according to the invention. FIG. 3 is a left side view of the arithmetic diagram. l... Propulsion tube, 2... General use striking head, 3...
・Ground, 6... Rotating propulsion device, 10... Cylindrical casing, 11... Chisel, 12... Air hammer% 1
5...Bit. Patent applicant: New Technology Development Co., Ltd.

Claims (1)

[Claims] A propulsion tube that is propelled into the ground made of rock. It is installed at the tip of this propulsion tube eccentrically from its axis.
, and at least one drilling striking head that generates the entire striking force using compressed air as a power source, and fixed to the chisel tip of this striking head f''1., and having a diameter equal to the radius of the propulsion tube or smaller than the diameter of the drill hole. A drilling device comprising: a bit; and a drive means for rotating the propulsion pipe and propelling it against the ground.