JPS63165695A - Direction control system of head pipe in boring device and direction controller for head pipe using said system - 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 Industrial Application] The present invention mainly relates to a method for controlling the direction of a leading pipe in a drilling device for drilling horizontal holes in small-diameter sewer pipes, etc., and a method for controlling the direction of a leading pipe using this method. This relates to a control device.

[Conventional technology]

When drilling holes in the ground, conventional drilling devices drive a drilling blade provided at the tip of a leading pipe while holding it at a constant angle with a hydraulic cylinder, and rotate the drilling blade while applying thrust. The system is configured to drill a hole in the ground, rotate a screw auger installed in the transport pipe, and transport out the stone blocks, gravel, etc. crushed by the hole.

[Problem that the invention seeks to solve]

However, in the conventional drilling equipment as described above, the drilling blade at the tip of the leading pipe is held at a certain angle when drilling, so the pressing force exerted on the drilling blade causes compression of the target ground. Unless the stress is greater than that, it is impossible to drill and move forward. Therefore, when the target ground is a gravel layer with large compressive stress, it is impossible to maintain a constant angle while drilling with the conventional reaction force holding method using a hydraulic cylinder.

In addition, in ground with high compressive strength, especially in the gravel layer mentioned above, the front surface of the cutting edge is likely to collapse, so when drilling by aligning the center point of the drilling blade with the axis of the transport auger and setting the position of the crushing pipe, , the crushing tube is pushed up toward the collapsed front surface of the cutting edge where there is less resistance, and the drilling direction is always gradually displaced in the upward direction. Therefore, the best way to control the cutting edge of the leading pipe is to set the upward angle at 0° or a very small angle, set the downward angle at a large angle, and set the horizontal control angle at an intermediate position. Although this has been proven through various drilling examples, no suitable control method has been proposed to date.

[Means for solving problems]

The present invention has been made with the aim of solving the problems of the prior art as described above, and has a structure in which, in a method for controlling the direction of a leading pipe in a drilling device, the joint surface between the leading pipe and the main body of the device is sloped. This part is used as a direction control part, and the guide pipe is characterized in that the upward direction control angle of the guide tube is zero or a slight upward direction, and the downward direction can be swung by a predetermined angle.

That is, in the control method of the present invention, the joint surface between the crushing pipe, which is to be the leading pipe, and the drilling device main body is made into an inclined surface, and this surface is used as the direction control section, and the upward direction control is set at zero or slightly upward direction, and the downward direction control is performed at zero degree or slightly upward direction. By allowing the robot to swing by a predetermined angle, appropriate directional control can be performed at all times.The principle of this is explained as follows.

In FIG. 1, reference numeral 1 denotes a crushing pipe which is to become a leading pipe in the drilling device, 2 a transport pipe, and 3 a drilling blade 3.4 provided at the tip of the crushing pipe 1. An eccentric screw auger with different diameters is installed inside the crushing pipe 1 to transport stone blocks, etc., and the joint surface A of the crushing pipe 1 to the transport pipe 2 is connected to the transport pipe 2.
The structure is not perpendicular to the axis of the machine, but at a predetermined angle.

Hereinafter, in order to explain the present invention in detail and so that it can be easily understood, a method for controlling the tip angle of the crushing tube 1 will be described in detail with reference to FIGS. 2 and 3, in which the attachment angle of the joint surface A is increased. Note that the symbols in the figure are the same as those in FIG. 1.

Figure 2 shows the case where the upward direction control angle in the direction control section is set to 0 degrees and the downward direction is allowed to swing by a predetermined angle. Let the intersection of line C-C and mounting surface A be ○. Further, the perpendicular line passing through the intersection ◯ to the mounting surface A is set as D-0, and the angle between it and the center line CC is set as φ. Similarly, the perpendicular line passing through the point O and dropping down to the center line C-C is E-0, and it is parallel to the A plane and the intersection point is 0.
If the straight line passing through is F-0, the angle between the straight lines E-0 and F-0 is similarly φ. The center line C-C passes through the center point G of the surface B of the crushing tube 1, and the center line of the crushing tube 1 coincides with the center line CC, and as shown in FIG. 2-1, the crushing tube 1. The transport pipe 2 is a cylinder on the same axis.

Moreover, the intersection of the straight line D-0 and the B surface of the crushing tube 1 is designated as H.

Next, fix the transportation pipe 2, center it on the 0 point, and move the crushing pipe 1 to A.
If the surfaces are brought into contact and rotated 90 degrees counterclockwise, the result will be as shown in Figure 2-2. That is, it is clear from FIG. 2-2 that the crushing tube 1 rotates around the straight line D-0 in contact with the A plane. In other words, the intersection H between the straight line D-0 and the B surface of the crushing tube 1 does not always move, and the center G point of the B surface is horizontal to the point H and maintains the distance H-G as shown in Figure 2-2. Move to the position shown and center the hole. Similarly, Figure 2-3 shows the case when rotated 180 degrees counterclockwise from Figure 2-1, and Figure 2-4 shows the position of the drilling center G on surface B when rotated 270 degrees counterclockwise. .

Next, FIG. 3 will be explained.

Figure 3 shows the case where the upward direction control angle in the direction control section is set to an extremely small angle and the downward direction can be swung by a predetermined angle, and as in Figure 2, C-C is the pipe of transport pipe 2. The center line passing through the heart, E-0, is a perpendicular line drawn to the intersection O of the center line C-C and the surface A, and the angle between the lines F-0 and E-O is φ. Also, a perpendicular line passing through point 0 and perpendicular to plane A is D-0
Then, the angle formed by C-〇 and D-〇 is also φ.

Center of surface B of crushing tube 1 is G, tube center line of crushing tube 1 is G-○
and the center line C-C of the transport pipe 2, / GoC is η, /
If φ+/η=lθ, as shown in Figure 3-1, point G
is located above the intersection of the center line cc of the transport pipe 2 with the plane B. Next, as described above, if the intersection of the rotation center line D-0 of the crushing tube 1 with the plane B is H, then when the crushing tube 1 is similarly rotated 90', 180', and 270'' in the counterclockwise direction. The position of the center point G of the drawing is shown in Figure 3-2.3.
-3.3-4.

Therefore, in the drilling operation, the direction of propulsion of the crushing tube 1 is controlled by appropriately changing the tightening position of the crushing tube 1, which is the leading tube of the punching device, at the joint surface A with the transport pipe 2 based on the above-mentioned principle. This makes it possible to complete the hole in the desired direction without any displacement.

Next, an example of a drilling device embodying the control method of the present invention will be explained with reference to the drawings.

In Fig. 1, 1, 2, and 3.4 are a crushing tube, a transport tube, a punching blade, and an eccentric screw auger with different diameters, respectively, as described above, and the attachment of the crushing tube 1 to the transportation tube 2 is on the surface, that is, the joint surface A. is not perpendicular to the axis of the transport pipe 2, but has a structure at a predetermined small angle. Eccentric screw auger 4
is firmly constructed integrally with the punching blade body 3. Note that b is the end of the auger blade of the auger 4.

5 is a protrusion provided in the crushing pipe 1; 6 is a universal joint that connects the eccentric screw auger 4 with a transport auger 7; 8 is a hydraulic cylinder disposed at the front of the transport pipe 2; 9 is the hydraulic cylinder; With the tightening piece attached to the tip of the cylinder 80 rod,
By forming the rear end outer circumferential wall surface d into a tapered shape, forming the inner circumferential wall surface of the clamping piece 9 so as to correspond to the wall surface d, and pulling the clamping piece 9 with the hydraulic cylinder 8, the crushed pipe is A portion of the tapered surface of the d-plane of the transport pipe 2 can be firmly integrated with the inner surface of the transport pipe 2 via a fastening piece 9.

Further, 10 is a valve holding body, 11 is a valve body rotatably attached to the valve support body 10, and 12 is a valve integrally fixed to the valve body 11 using flexible rubber or the like. 13 is a spring for maintaining an appropriate thrust; 14 is a valve box; and 15 is a muddy water transport pipe. The pressing force is adjusted with .

The above constitutes an example of the device of the present invention.
This device can realize the direction control method of the leading tube or crushing tube 1 described above, and also has the following features.

・In order to crush the large-diameter stone blocks taken in by the drilling blade 3 into a size that can be transported by the transportation auger 7, an eccentric screw auger of different diameters is provided in the crushing tube 1, and the stone blocks are crushed into smaller pieces than necessary. I tried not to crush it.

・For drilling in geological formations that are prone to collapse due to the internal water pressure of the water-retaining layer, such as a water-retaining gravel layer, a pressure retention mechanism using a valve type such as a spring type is provided.

The operation of the punching device configured as described above will be explained as follows.

When the transportation auger 7 is rotated in the state shown in FIG. Loosen 9 and move the universal joint 6 in the direction of the arrow.
When the transportation auger 7 is rotated slowly, it collides with the auger blade end projection 5 of the eccentric screw auger 4 of different diameters, and the crushing tube 1 rotates together with the eccentric screw auger 4 of different diameters. 2-1 to 2-4 or 3- in Figure 3
The rotation of the eccentric screw auger 4 of different diameters is stopped at any set position of 1 to 3-4, and the eccentric screw auger 4 of different diameters is moved in the direction opposite to the arrow to make contact with the protrusion 5 of the auger blade part. The shredding pipe 1 and the transport pipe 2 can be firmly tightened together by a tightening piece 9 using a hydraulic cylinder 8. That is, the crushing tube 1 is
It can be freely set to any position between FIGS. 2-1 to 2-4 or 3-1 to 3-4 in FIG.

Therefore, when the direction of the crushing tube 1 needs to be controlled during the drilling operation, the direction of the crushing tube 1 can be easily displaced by performing the above operation, and the drilling operation can be performed accurately.

As mentioned above, the thrust force is to be maintained at the joint surface A.

Since the method for carrying out excavated waste using the leading pipe of the present invention adopts the method of carrying out the perforated ground using a screw auger, even when carrying out crushed stone blocks, there is a gap between the transport pipe 2 and the transport auger pipe shaft 7. It is sufficient to pass through. Crushing more finely than necessary in the crushing tube 1 is unnecessary and results in a loss of power.

As shown in FIG. 1, the eccentric screw auger 4 has a
The auger blade is installed offset from the axis. Therefore, the stone blocks taken into the crushing tube 1 are pinched and crushed between the tip of the blade and the inner surface of the crushing tube 1 by the rotation of the eccentric screw auger 4 of different diameters. Since it does not need to be crushed into small pieces, it is extremely efficient and consumes less power.

In addition, when using the above-mentioned device to drill through a water-retaining gravel layer, the most dangerous thing is that the internal water pressure of the water-retaining layer causes the gravel layer, etc. to flow into the gap of the screw auger together with a large amount of water at once, leading to The ground where the hole was drilled will cave in. In order to prevent accidents caused by such cave-ins, a commonly used method is the muddy water shield construction method using a circulation pump, but in order to implement this construction method, treatment of muddy water for transportation-12= is necessary. Many in- and out-of-hole processing equipment are required, such as settling tanks, mud pumps, mud pumps, and pipes. In addition, the muddy water transportation method always requires a certain proportion of muddy water to the amount of pumped earth and sand, which increases the amount of land required for muddy water treatment equipment and increases economic costs.

Normally, the collapse of a water-retaining gravel layer will not occur if the balance of the water-retaining pressure is maintained, but if the water pressure in the water-retaining gravel layer changes, the water will increase its water pressure to remove the change in water pressure. This occurs because sand and gravel move together as you move from a high place to a low place.

Therefore, it is sufficient that the water pressure in the water-retaining gravel layer is kept constant and that there are no voids that could collapse in the underwater space of the gravel. In addition, the flaw in the mud shield method is that pressure is required to pump the mixture of drilling earth and sand and pumped mud from the tip of the hole to the outside of the mine. , the required pressure is the pipe loss pressure of muddy water +
Due to water pressure in the aquifer layer, the mud shield method for an aquifer layer with a shallow soil cover may cause uplift of the drilling ground, unlike the normal propulsion method.

However, in the present invention, by adopting the configuration shown in FIG. 1, the above-mentioned defects can be eliminated.

In other words, if the spring 13 is installed with an appropriate thrust in accordance with the water pressure of the water retention gravel layer, in other words, the depth from the ground surface to the center of the propulsion structure, the retention will always be maintained. Since the water pressure in the water layer and the pressure at the outlet C of the mud water transport pipe can be maintained constant, by adopting this pressure holding mechanism, propulsion drilling can be performed without causing collapse of the water reservoir layer. However, there is no risk of causing upheaval of the target ground. Note that the spring 13 can be replaced by an air cylinder, an air spring, or the like.

In addition, the device of the present invention is characterized by a large rotational moment generated when crushing a stone block by the crushing tube 1 and the eccentric screw auger 4 of different diameters, in other words, the maximum torque of the transportation screw auger 7, that is, the maximum torque of the machine. However, it is necessary to firmly fix the crushing tube 1 integrally with the transport tube 2 so that it cannot be rotated.

Therefore, in the device of the present invention, as described above, the clamping piece 9 is pulled by the hydraulic cylinder 8, and the tapered part of the d section of the crushing tube 1 and the inner surface of the transport pipe 2 are connected via the clamping piece 9. It was made to be strongly integrated.

The increase in tightening force will now be explained with reference to FIG. 6.

In the figure, F is the tensile force exerted by the hydraulic cylinder 8, and S is d
The tensile force F can be decomposed into two forces, P and Q. Therefore, the clamping force acting on the d-plane is
A reaction force in the same direction as the force Q acting on the inner surface of , acts on the d surface as a tightening force.

Also, the force perpendicular to the d-plane is the same as P, and each Q=
F/TANs, P=F/5INs.

Therefore, if the taper of the d part is appropriately selected and designed,
It is possible to obtain an extremely large clamping force on the crushing tube 1, and in particular, as in the case of a leading tube, the outer diameter of the transportation screw auger 7 is as large as possible, and the outer diameter of the transportation tube 2 can be determined, making it possible to use a hydraulic cylinder. It is extremely effective for small leading pipes where the size of the 15-8 is limited.

〔Effect of the invention〕

Since the present invention is as described above, it is suitable as a direction control method for a leading pipe in a drilling device and a direction controlling device for a leading pipe using this method.

[Brief explanation of the drawing]

Figure 1 is a longitudinal sectional view of the leading pipe, Figures 2 and 3 are explanatory diagrams for controlling the direction of the leading pipe, Figure 4 is a front view of the piercing blade of the leading pipe, and Figure 5 shows the section X in Figure 1. It also shows the cross section of the sixth
The figure is an explanatory diagram of the force acting on the d-portion tapered surface of the tightening piece.

Claims (1)

[Claims] 1. In a direction control system for a leading pipe in a drilling device,
The joint surface between the leading pipe and the main body of the device is made a slope, and this part is used as a direction control part, so that the leading pipe can swing downward by a predetermined angle while the upward direction control angle is 0 degrees or slightly upward. A directional control method for the leading pipe. 2 A crushing tube with a punching blade fixed to the tip and a screw auger with blades of different diameters and eccentrically installed inside is used as the leading tube, and the rear end surface of the crushing tube and the tip surface of the transport tube of the punching device main body The joint surface with the screw auger is formed into a slope so that it can be tightened and opened by a hydraulic cylinder, etc., and the rear end of the screw auger is connected to the tip of a transport auger placed in the transport pipe by a universal joint, and the crushing pipe A protrusion is formed on the inner surface of the screw auger, and the blade end of the screw auger is positioned so that it can come into contact with and separate from the protrusion, and when the joint surface is tightened by the hydraulic cylinder or the like, even when the screw auger is rotated, the blade end does not come into contact with the protrusion. If the screw auger is rotated with the joining surface open without the blade abutting against the protrusion, the blade end will abut against the protrusion, rotating the crushing tube, changing the connection angle with the transport pipe, and crushing. 1. A direction control device for a leading pipe in a drilling device, characterized in that the direction of the pipe can be swung at an upward angle of zero or a slight upward direction, and a downward direction at a predetermined angle. 3. A crushing tube with a punching blade fixed to the tip and a screw auger arranged inside is used as a leading tube, and the joint surface between the rear end surface of the crushing tube and the tip surface of the transport tube of the punching device main body is formed into an inclined surface. The screw auger can be tightened and opened freely by a hydraulic cylinder or the like, and the rear end of the screw auger is connected to the tip of a transport auger placed in the transport pipe by a flexible joint, and a protrusion is formed on the inner surface of the shredding pipe. While the blade end of the screw auger is positioned so as to be able to come into contact with and separate from the protrusion, a muddy water transport pipe is arranged within the transport pipe to supply muddy water into the crushing pipe, and at an appropriate point in the middle of the transport auger. A pressure holding mechanism using a valve type, such as a spring type, is disposed on the shaft, and when the joint surface is tightened by the hydraulic cylinder or the like, even if the screw auger is rotated, its blade end does not come into contact with the protrusion. When the joint surface is opened and the screw auger is rotated, the blade end comes into contact with the protrusion, rotates the crushing tube, changes the connection angle with the transport tube, and changes the direction of the crushing tube so that the upward direction angle is zero or A direction control device for a leading pipe in a drilling device, characterized in that it can swing slightly upward and downward by a predetermined angle. 4 Forming the outer circumferential wall surface of the rear end of the crushing tube into a tapered shape, disposing a tightening piece between the outer wall surface and the inner wall of the transport pipe, and pulling the tightening piece with a hydraulic cylinder provided on the transport pipe. The apparatus according to claim 2 or 3, wherein the crushing tube and the transport tube are integrated.