JPS61176789A - Drilling device and method of correcting direction of drilling - 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 and a method for correcting the drilling direction.

[B] Problems to be solved by the present invention For example, when drilling a hole in the horizontal direction using an auger screw, the drilling direction may shift downward due to its own weight, or the direction of rotation of the auger screw may shift other than downward. There is a tendency for the holes to shift, making it difficult to drill holes while maintaining accurate straightness.

[Explanation] Purpose of the present invention The present invention has been made to solve such problems, and has a simple structure that corrects the drilling direction during drilling to maintain linearity along the planned drilling line. It is an object of the present invention to provide a drilling device capable of drilling a hole and a method for correcting the drilling direction.

[C] Means for Solving Problems The present invention is a hollow tube in which the rod part of a pilot rod is provided with screw blades on the front part of the rod, and a hole drilling blade is provided on the outer periphery. Insert the hollow auger into a hollow auger that has an insertion hole parallel to the axis at a position away from the axis of the hollow tube, position the insertion hole of the hollow auger in the direction to be corrected, and rotate the hollow auger. Relates to a technical means of moving the pilot rod forward in the correction direction with the pilot rod stopped, and then digging in the correction direction while rotating the hollow auger with the pilot rod as the center of rotation with the pilot rod stopped. It is something.

[2] Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

First, the hole drilling device will be explained.

(1) Description of the entire hole drilling device (FIG. 1) The hole drilling device 1 is composed of a hollow auger 2 and a pilot rod 3 provided with a driving means.

(2) Hollow Auger (Figure 1.2) The hollow auger 2 is formed by attaching blades 21 in a spiral manner to the outer periphery of a hollow tube with open ends.

An insertion hole 22 for inserting the pilot rod 3 is provided inside the hollow auger 2 at a position away from the axis C1 of the hollow auger 2.

The center axis C2 of this insertion hole 22 is formed parallel to the axis C1 of the hollow auger 2.

Further, the diameter of the inner insertion hole 22 is formed to be slightly larger than the outer diameter of the pilot rod 3, so that when the pilot rod 3 is inserted, there is no large play between the inner insertion hole 22 and the pilot rod 3.

When actually using the hollow auger 2, the hollow auger 2 of a fixed size is connected and used.

(3) Pilot rod (Fig. 1.2) The pilot rod 3 consists of a tip rod 31 and an extension rod 32.

At the front of the tip rod 31, there is a screw blade 3 with several turns.
3, and an extension rod 32 is connected to the rear end.

The connection between the two rods 31 and 32 and the extension rod 32 is made by screwing, for example, so that rotational movement from the proximal end of the extension rod 32 can be reliably transmitted to the distal end rod 31.

Further, a flat portion 34 is formed on the circumferential surface of the extension rod 32, for example, when the extension rod 32 has a circular cross section as in this embodiment.

In this pilot rod 3, an extension rod 32 is rotatably inserted into the insertion hole 22, and only the tip rod 31 is exposed at the tip of the hollow auger 2.

(4) Driving means (Fig. 1) During normal straight drilling, mechanical rotational force and axial thrust are applied to the hollow auger 2 to perform drilling. (As a result of the rotation of the hollow auger 2, the pilot rod 3 inserted at an eccentric position also rotates.) Only when correcting the drilling direction,
The pilot rod 3 is configured to be given independent rotation.

In order to provide two types of rotational force in this way, for example, as shown in FIG.
2 and deploy it.

The hollow auger 2 is configured to be able to rotate and slide in the axial direction.

Furthermore, the configuration is such that only the pilot rod 3 can be rotated.

For this purpose, a pilot rod drive board 44 is installed in a planetary manner within the hollow auger drive board 43 so as to be able to rotate and revolve.

Transmission of the rotational motion to the pilot rod 3 can be carried out using, for example, a connecting body 5 shown in FIG. 3.

A locking groove 24 is recessed in the pilot rod drive board 44.

On the other hand, extend the extension rod 3 toward the center of a part of the connecting body 5.
A notch 51 having a width that can hold the flat part 34 of the horseshoe-shaped copper plate 2 is formed, and a protrusion 52 is provided protruding from one surface of the horseshoe-shaped copper plate in correspondence with the locking groove 24 to form the connecting body 5.

By inserting and mounting the protrusion 52 of the connecting body 5 into the locking groove 24, the rotation of the pilot rod drive board 44 is transmitted to the pilot rod 3.

Note that the free end of the locking spring 53 is made to protrude into the notch 51 so that the connecting body 5 does not come off during installation.

Next, the drilling method will be explained.

(1) Drilling proceeds without rotating the hollow auger drive board 43 of the M-drilling hole drive device 4 and applying rotational motion to the hollow auger 2.

At this time, the hole is drilled while the tail end of the tip rod 31 is brought close to the front end of the hollow auger 2.

At this time, the hole opened by the screw blade 33 of the pilot rod 3 is opened in an enlarged shape rotated about the axis C1.

(2) Correction of drilling direction If a deviation occurs in the drilling direction, correct it as follows.

Confirm the correction direction> First, check the direction of the shift.

In this embodiment, a case where the hole deviates downward from the planned drilling line will be explained as an example.

After confirming the direction of the deviation, insert the insertion hole 22 of the hollow auger 2,
After the hollow auger 2 is positioned in the opposite direction of the shift, that is, at the top position in this embodiment, the rotation of the hollow auger 2 is stopped.

(Fig. 4) Advancement of the pilot rod> (Fig. 5) Next, attach the connecting body 5 to the base end of the extension rod 32, and rotate the pilot rod drive board 44 to advance only the pilot rod 3. .

Since the screw blade 33 of the pilot rod 3 is a short blade with several turns, the resistance applied to drilling is small, and the pilot rod 3 can be easily advanced.

The forward distance of the pilot rod 3 is set to such a length that the tip rod 31 reliably penetrates into the ground.

Since the insertion hole 22 is positioned in the opposite direction of the displacement, the pilot rod 3 moves forward in the opposite direction of the displacement, that is, in the upper position.

Excavation with a hollow auger> (Fig. 6) After advancing the pilot rod 3 and ensuring that it is buried in the ground, stop the rotation of the pilot rod 3, and then use the drive device 4 to cause the hollow auger 2 to rotate. give.

At this time, the pilot rod 3 functions as a guide for the advancement of the hollow auger 2 because the tip rod 31 penetrates into the ground and is fixed.

Therefore, the hollow auger 2 has a center axis C2 of the insertion hole 22.
It moves forward while rotating around the center and drawing a trajectory L2. - As a result, a large-diameter hole L2 is drilled while moving the rotation center upward from the hole drilled just before the correction work (the hole Ll drilled centering on the axis C1).

After the hollow auger 2 is returned to the planned drilling line in the manner described above, the rotation from the drive device 4 is transmitted to the hollow rod 2 again to perform drilling.

In addition, if the deviation is large, repeat the above correction work several times.

[E1.Effects] Since the present invention is as explained above, the following effects can be expected.

(1) If the hole deviates from the planned drilling line, position the hollow auger's insertion hole in the opposite direction (correction direction) of the deviation, advance only the pilot rod, and then rotate the hollow auger to continue drilling. With a simple operation, it is possible to drill a hole with an increased diameter in the opposite direction of the deviation.

Therefore, the drilling direction can be easily corrected, and the correction accuracy is significantly improved compared to the prior art.

(2) Since the front part of the drilling device is not equipped with a hydraulic device or other equipment for correcting the drilling direction, the structure of the drilling device is simple and can be made compact.

(3) When correcting the direction of drilling, the pilot rod can be used to check for various buried objects underground before proceeding with the drilling, making it possible to avoid destruction of buried pipes, etc. if they exist.

Therefore, the safety of the drilling operation is improved.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of one embodiment of the drilling device. Figure 2: A partial sectional view of the main parts of the drilling equipment. Figure 3: An explanatory diagram of the method of attaching the coupling body. Figures 4 to 6: Drilling direction. Figure 7: An explanatory diagram of the hole diameter before and after correcting the drilling direction using a hollow auger.

Claims (2)

[Claims] (1) The rod part of the pilot rod, which has screw blades on the front part of the rod, is a hollow tube with screw blades on the outer periphery, and the shaft is located off the axis of the hollow tube. A hole drilling device that is inserted into a hollow auger with an inner hole opened parallel to the center, and configured to apply rotational force and axial propulsive force to the pilot rod and the hollow auger simultaneously or optionally. (2) The rod part of the pilot rod, which has screw blades on the front part of the rod, is a hollow tube with screw blades on the outer periphery, and the shaft is located off the axis of the hollow tube. Insert it into a hollow auger with an insertion hole opened parallel to the center, position the insertion hole of the hollow auger in the direction to be corrected, and move the pilot rod in the direction of correction while stopping the rotation of the hollow auger. A method for correcting the drilling direction, which is characterized by drilling in the correcting direction while rotating the hollow auger with the pilot rod as its center of rotation with the pilot rod stopped rotating.