JP3448018B2 - Underground excavator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavating device for making a hole in the ground horizontally or in a slanting direction for a long time, and its driving unit is provided in a cylindrical casing having a rotary excavating machine for excavating the natural ground at the tip thereof. It consists of an excavator body with a drainage path and a plurality of propulsion pipes that form an underground tunnel in the rear.The tail end of the propulsion pipe is pressed to propel the whole body and the rotary excavator at the tip is rotated. Then, excavate the ground and discharge the excavated rock fragments, gravel fragments, and muddy water through the excavator body and the inside of the propulsion pipe. Technology to ensure motion.

[0002]

2. Description of the Related Art In a conventional underground excavation propulsion machine, when a rotary excavator for excavating the tip of the earth is rotated, the excavator body also tries to rotate. Conventionally, the rotation of the propulsion machine was stopped by the frictional force between the outer circumference of the tubular casing of the excavator body of the propulsion machine, the outer circumference of the rear propulsion pipe, and the drilled hole. ， When trying to improve the crushing efficiency with a cone crusher, the turning torque of the propulsion machine becomes large, and stopping it is not enough with friction alone, the excavator body rotates, and as a result, the rotating excavator There was a problem that the excavation power was reduced.

[0003]

The problem to be solved by the present invention is to solve these problems of the prior art and to sufficiently prevent the rotation of the main body of the propulsion machine, and thus to efficiently excavate the rotary excavator. It is to provide an underground excavation propulsion machine that can be demonstrated to the full.

[0004]

Means for Solving the Problems The constitution of the present invention which has solved the above problems is as follows: 1) A rotary excavator for excavating the ground is provided at the tip of a cylindrical casing, and a drive unit for rotating the rotary excavator. In an underground excavation propulsion device comprising an excavation machine main body having a mud discharge path for discharging excavated rock fragments and mud at the tip of the casing to the outside, and a propulsion pipe behind the excavation machine main body, mounting an annular expansion and contraction body on the outer periphery of the casing, the deflating portion for inflating and deflating the inflation and deflation member provided, the depth of the recess deflating member is affixed by bonding at leading and trailing edges thereof in the recess of the casing Almost the same
A rubber ring of a planar rubber plate having a thickness, wherein the expansion / contraction means is a compressed air discharge device for supplying compressed air between the rubber ring and the casing recess for expansion.
Underground excavation propelling machine characterized in that the expansion / contraction body is expanded so as to project outward from the casing outer surface and brought into contact with the hole wall of the drilling hole to stop the rotation of the casing 2) A plurality of casing outer peripheries The underground excavation propulsion machine according to the above 1), in which a rod is retractably installed in a radial direction 3) The casing is divided into three bodies, a front casing, an intermediate casing, and a rear casing, which are designed to be mutually waterproof. The above-mentioned 1) in which a plurality of correction jacks are erected between the front casing and the intermediate casing and between the front casing and the rear casing and between the front casing and the rear casing, and the expansion and contraction body and the rod are arranged on the outer periphery of the front casing. Or 2) The underground excavation propulsion device according to any one of the above.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As a means for making a rod freely retractable according to the present invention, a method using a cylinder such as a hydraulic cylinder (jack) or an air cylinder is generally used.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In the expansion and contraction body of the embodiment, a planar rubber plate is annularly stretched over a concave portion on the outer periphery of the casing, compressed air is sent from the inside of the rubber plate to expand it so as to protrude from the casing surface by about 100 to 150 mm. Also, the rods are provided in three places by using the cylinder rods of the hydraulic cylinder (hydraulic jack) as they are. The casing is divided into a front casing, an intermediate casing, and a rear casing. The rubber plate and the rod are both provided on the outer periphery of the intermediate casing, and are connected by four correction jacks so that they can move back and forth. This is an example of enabling pressing against the ground.

FIG. 1 is a vertical sectional view of the essential part of the embodiment.
FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 shows B of FIG.
It is a -B sectional view. In the figure, S is an underground excavation propulsion machine of the embodiment, S1 is an excavation machine main body, S2 is a plurality of propulsion pipes connected to the rear of the excavation machine main body, G is the ground, and H is an underground excavation propulsion machine S. Drilled holes, 1 is a rotary excavator, 1a is a rotary shaft of the rotary excavator, 1b is a bit, 1c is a roller bit, 2 is a drive unit for rotating the rotary excavator, and 3 is an exhaust mud passage. The mud pipe, 4 is a casing of the excavator main body S1, 4a is a front front casing divided from the casing 3, 4b is an intermediate middle casing, 4c is a rear rear casing, 5c
Reference numerals a and 5b are joint portions for joining the front casing 4a and the intermediate casing 4b, and the middle casing 4b and the rear casing 4c so as to be slidable and waterproof, and 6 is the front casing 4a and the intermediate casing 4b. During this period, the intermediate casing 4b and the rear casing 4c are connected so as to be able to move back and forth, and a set of four correction jacks for correcting the excavation direction and pressing the rotary excavator 1, and 7 are provided on the outer periphery of the intermediate casing 4b. An annular expansion / contraction body using a flat rubber ring, 7a is a recess for accommodating the expansion / contraction body in the casing 4, 7b is a bonding portion of the expansion / contraction body 7 with recesses at the front and rear edges, and 7c is compressed air injection. tube,
Reference numeral 8 is an expansion / contraction means for sending and discharging compressed air, 8a is a high-pressure air cylinder, 8b is a high-pressure air opening / closing electric valve for the high-pressure air cylinder, and 8c is an air-release electric opening for releasing the air in the compressed-air injection pipe 7c to the atmosphere. Valve, 9 is sub-casing 4b
A rotation stopping rod 9a is a hydraulic cylinder (hydraulic jack) for advancing and retracting the rod.

In this embodiment, the rotary excavator 1 has a drive unit 2
Of the rock excavated rocks, gravel, and stones crushed and discharged by the bit 1b and roller bit 1c mounted on the front surface of the rotary excavator 1 Pebbles, etc. are passed through the mud pipe 3 and the excavator body S
It is sent to the rear through 1 and the inside of the propulsion pipe S2 and discharged to the ground.

In this embodiment, the open / close electric valve 8b is opened, and the air vent electric open valve 8c is the high pressure air cylinder 8
a is communicated with the compressed air injection pipe 7c,
During excavation work, the high-pressure air in the high-pressure air cylinder 8a is sent to the annular expansion / contraction body 7 using a rubber ring via the compressed air injection pipe 7c, and the expansion / contraction body 7 is compressed by the pressure of the compressed air sent inward. Swells so as to protrude in the radial direction by 100 to 150 mm and is pressed against the hole wall of the drilled hole H, and the rotation of the casing 4 is stopped by the high frictional resistance due to the pressure contact. At the same time, the hydraulic cylinder 9a is actuated to extend the rod 9 in the radial direction so that the rod 9 is pierced into the hole wall of the drilled hole H to provide resistance to the rotation of the casing 4. In this way, the casing 4 is fixed to the drilled hole H by the expansion of the expansion / contraction body 7 and the extension of the rod 9, and the rotation of the casing 4 is effectively stopped. This prevents the excavator body S1 from rotating even when the rotary excavator 1 is strongly rotated. Further, the length of the correction jack 6 that extends in the circumferential direction can be changed so that the front casing 4a and the intermediate casing 4b are inclined with respect to the rear casing 4c. This allows you to change or adjust the direction of excavation. Further, by extending the whole, the rotary excavator 1 is pressed against the natural ground to make excavation effective.

[0010]

As described above, according to the present invention, the rotation of the excavator main body caused by excavation in the underground excavator is prevented.
The expansion of the expansion / contraction body provided on the outer periphery of the casing can increase and prevent the resistance against the hole-drilling wall, so that the rotary excavator can be strongly rotated and the excavation efficiency can be improved. Further, by mounting the rod on the outer periphery of the casing so as to be retractable, the rotation of the excavator main body can be further reliably prevented.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a main part of an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

S Underground excavator S1 excavator body S2 propulsion tube G ground H drilling 1 rotary drilling machine 1a rotating shaft 1b bit 1c roller bit 2 drive 3 sludge pipe 4 casing 4a front casing 4b Intermediate casing 4c Rear casing 5a joint 5b joint 6 modified jack 7 expandable body 7a recess 7b Adhesive part 7c Compressed air injection pipe 8 expansion and contraction means 8a high pressure air cylinder 8b Open / close electric valve 8c open valve 9 rod 9a hydraulic cylinder

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E21D 9/06 302 E21D 9/06 311 E21D 9/10

Claims (3)

(57) [Claims] 1. A rotary excavator for excavating a rock mass is provided at the tip of a tubular casing, and a drive unit for rotating the rotary excavator and excavated rock fragments of the rock mass at the tip of the casing and mud are discharged to the outside. In an underground excavation propulsion machine comprising an excavator main body having a mud discharge passage provided in the casing and a propulsion pipe behind the excavation machine, an annular expansion / contraction body is attached to the outer periphery of the casing, and the expansion / contraction body is The expansion and contraction means for expanding and contracting is provided, and the expansion and contraction body is attached to the recess of the casing by its front edge and rear edge, and the depth of the recess
Is a rubber ring of a planar rubber plate having substantially the same thickness as that of , and the expansion / contraction means is a compressed air pressurizing / discharging device for supplying compressed air between the rubber ring and the casing recess for expansion. An underground excavation propulsion device, characterized in that the body is expanded so as to project outward from the outer surface of the casing and brought into contact with the hole wall of the drilled hole to stop the rotation of the casing. 2. The underground excavation propulsion apparatus according to claim 1, wherein rods are provided at a plurality of positions on the outer periphery of the casing so as to be retractable in the radial direction. 3. The casing is divided into three bodies, a front casing, an intermediate casing, and a rear casing, which are slidably connected to each other within a predetermined range so as to be waterproof, and between the front casing and the intermediate casing and between the intermediate casing. A plurality of correction jacks are installed between the rear casing and the expansion / contraction body and the rod are arranged on the outer periphery of the intermediate casing.
Underground excavation propulsion machine according to any one of the above.