JP3169536B2 - Hole bending correction method in double tube rod drilling and double tube rod therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for easily and quickly changing a drilling direction in the middle of drilling while drilling with a double pipe rod without using a jig or a device for correcting hole bending. The present invention relates to a method for correcting a hole bend in a double tube rod drilling and a double tube rod therefor.

[0002]

2. Description of the Related Art In anchor work or ground improvement work for slope stabilization, drilling to a predetermined depth is performed while sequentially adding perforated pipes such as a single pipe rod and a double pipe rod. In particular, in the case of drilling with a double pipe rod,
By rotating the inner pipe and the outer pipe in opposite directions, the rotational torque can be offset,
The rod is often used because the overall rigidity of the rod itself is increased and the drilling accuracy is good.

[0003] The drilling by the double pipe rod is performed by internal drilling by a rotary percussion drilling method in a state of a double pipe in which an inner pipe is inserted into an outer pipe. The hole may be bent due to the deviation of the hole and the characteristics of the drilling machine itself.

Heretofore, relatively many proposals have been made as a method of correcting the occurrence of the bending of the hole. For example, in Japanese Patent Publication No. 2-33830, when a hole is bent, a direction correcting guide is inserted outside a drilling shaft, and the direction correcting guide is cut using a tapered portion provided on an inner surface of the direction correcting guide. A method of correcting a hole bending by advancing a drilling shaft while turning a bore tube axis in an opposite direction is disclosed.

[0005]

However, in the case of the above-mentioned conventional method, for example, the bending of the generated hole is measured by an inclinometer provided in the rod or in Japanese Patent Application Laid-Open No. Hei 5-3215.
No. 68, a detection method using a magnetic field,
Specifically, while using a drill as an electromagnetic wave source, the hole is drilled by a method such as detecting the bending of the hole during drilling using the directional characteristics of the directional electromagnetic wave receiving element installed inside the drilled hole. If the bend is measured, the direction is corrected by inserting a direction correcting jig or replacing a direction correcting guide. Therefore, once the drilling work is interrupted,
Since it is necessary to advance drilling while taking time and effort to insert / change the direction correcting guide, there is a problem that the drilling efficiency is reduced as a result.

[0006] In addition, the bending in the rod drilling occurs at the rod tip. If the drilling depth is shallow, the inclination of the drilling axis can be corrected relatively easily by installing the direction correcting guide on the ground side, but the drilling depth is reduced. If the rod is deep, even if a force in the inclination correction direction is applied to the rod on the ground, the rod itself bends and the hole around the rod is constrained by the ground, causing the hole to bend at the rod tip. It is not easy to fix.

Accordingly, a main problem of the present invention is that, when a bend is detected during drilling, the hole generated while drilling with a double pipe rod is used without using a jig or device for correcting the bend. It is an object of the present invention to provide a method for correcting a hole bend in a double tube rod drilling capable of correcting a bend quickly and effectively, and a double tube rod therefor.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method of manufacturing a semiconductor device, comprising the steps of: providing an upper tube on the inner surface of the outer tube at different positions in the longitudinal direction of the tube and facing each other; Forming a side convex portion and a lower convex portion, on the distal end side of the inner tube, on the outer surface of the inner tube, substantially in an upper region corresponding to the upper convex portion and an upper region corresponding to the lower convex portion; Forming a diameter-increased portion with a larger tube outer diameter, and when the inner tube is advanced relatively, the upper and lower protrusions of the outer tube are brought into contact with the inner tube diameter-increased portion, so that the rod tip The double pipe rod is configured so that the inner pipe axis is inclined with respect to the outer pipe axis at the portion, and if the hole is bent during drilling by the double pipe rod, the outer pipe is stopped. Drilling the inner tube only from the current drilling tip position and correcting the hole bending in the undrilled area It is characterized in that to form the hole bending correction guide hole toward.

Therefore, for example, if hole bending is detected by a hole bending detecting means such as an inclinometer provided separately, a hole bending correction guide hole is formed in the uncut area in the manner described above, and then the double hole is formed again. When drilling with the pipe rod, the outer pipe advances along this hole while being guided by the hole bending correction guide hole, so that the hole bending can be easily and effectively corrected at an early stage when the hole bending occurs. be able to. As a result, drilling can be performed with high construction accuracy.

Further, in the case of the present invention, since the bending of the hole is directly corrected by the directional control at the distal end portion of the double pipe rod, it is basically effective regardless of the shallow and deep drilling depth. Can be corrected.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view of a double pipe rod according to the present invention. The double pipe rod R is composed of an outer pipe 1 and an inner pipe 2
As shown in the figure, drilling is performed while drilling water, excavated earth and sand, etc. are turned inside out by, for example, a rotary percussion method with the inner pipe 2 inserted through the outer pipe 1. The relative positional relationship between the outer tube 1 and the inner tube 2 is as follows: a first mode in which drilling is performed in a state where the tip of the inner tube 2 is located inside the tip of the outer tube 1; A second mode in which drilling is performed while keeping the tip at substantially the same position, and a third mode in which drilling is performed with the tip of the inner tube 2 protruding outward from the tip of the outer tube 1 can be considered. Is applicable to any of the above three perforation modes. In the following, an example of the first embodiment will be described. On the distal end side of the outer tube 1 of the double tube rod R, the inner surface of the outer tube 1 is located at a different position in the tube longitudinal direction and on each side facing each other. Upper side convex part 10
Further, a lower-side convex portion 11 is formed. Each of the upper-side convex portion 10 and the lower-side convex portion 11 has a triangular cross-sectional shape, and as shown in the transverse cross-sectional view of FIG. And the protrusion height is 0
Are formed continuously, and notches 10a, 10a,... Are formed at appropriate places in the circumferential direction, and a return water passage is secured. The cross-sectional shape of the convex portions 10 and 11 is not limited to the triangular shape, but may be various shapes such as a trapezoidal shape and an arcuate shape. It is not necessary to form the projecting height d substantially continuously in the circumferential direction, as in the above-described example, but, as shown in FIG. 5, for example, as shown in FIG. May be formed.

On the other hand, on the distal end side of the inner tube 2, on the outer surface of the inner tube 2, an upper diameter increasing portion 20 having a tube outer diameter substantially increased in an upper region at a position corresponding to the upper-side convex portion 10; A lower diameter-increasing portion 21 having a substantially larger tube outer diameter is formed in an upper region at a position corresponding to the lower-stage convex portion 11. As shown in the cross-sectional view of FIG. 2, the diameter-increased portions 20 and 21 are formed by providing a thick portion having a predetermined height h in the circumferential direction of the inner tube 2.

Since the diameter increasing portions 20 and 21 need only substantially increase the outer diameter of the inner tube 2, as shown in FIG. 4, for example, trapezoidal cross sections are formed at appropriate intervals in the circumferential direction of the inner tube 2. Can also be formed by providing the ridges 22, 22,... At a predetermined length in the pipe axis direction. In this case, since the gap between the trapezoidal ridges 22 and 22 serves as a return water passage, the upper and lower protrusions 10 formed on the outer pipe 1
It is not necessary to provide the cut-out 10a for the water passage in 11. Further, an inclinometer 3 for detecting the bent state of the hole of the rod R is provided inside the inner tube 2.

Therefore, when the inner tube 2 is advanced relatively while the outer tube 1 is fixed in position, as shown in FIG. Contact with the diameter portion 20, and the lower convex portion 11 of the outer tube 1 and the inner tube 2
The position of the inner tube 2 is regulated by the contact with the lower diameter-increased portion 21, that is, by controlling the position of the inner tube 2 at the portion A at the tip of the upper convex portion 10 and at the portion B at the tip of the lower convex portion 11. _i is inclined at an inclination angle α with respect to the outer tube axis L _O.

In drilling using the double pipe rod R, drilling is performed while sequentially checking the bending state of the hole with the inclinometer 3, and during drilling, for example, the drill is inclined to the right side in the drawing in FIG. If the hole is bent, first, the penetration and rotation of the outer tube 1 are stopped. Specifically, since the penetration direction of the rod R is to be corrected to the left side in the drawing, the lower convex portion 11 is set to the right side in the drawing, and the upper convex portion 10 is set to the left side in the drawing. The outer tube 1 is stopped.

Next, with the outer tube 1 stopped, the inner tube 2
Only the hole is made to penetrate deeper than the current hole tip position C. As described above, the inner tube 2 is configured such that the diameter-increased portions 20 and 21 formed on the inner tube 2 ride on the upper-stage protrusion 10 and the lower-stage protrusion 11 of the outer tube 1, thereby forming the inner tube shaft. Since the core Li is inclined at an inclination angle α with respect to the outer tube axis Lo, as shown in FIG. 6, the hole bend is corrected in the unbent area in the hole bend correction direction (left tilt direction in the drawing). A guide hole F is formed. Next, the inner tube 2 is stopped in the forward state, and the outer tube 1 is pierced to a proper relative position with respect to the inner tube 2 shown in FIG. . Alternatively, after the inner pipe 2 is once returned to the original position shown in FIG. 1, drilling with the double pipe rod may be performed again. When the hole bending correction guide hole F in the direction of the inclination angle α exists in front of the tip of the outer tube 1, the outer tube 1 naturally advances along the correction guide hole F, and the generated hole bending is automatically corrected. You.

By drilling while performing such hole bending correction as needed, a drilled hole can be formed with high construction accuracy.

If the hole bends to the left in the drawing in FIG. 1, the outer tube 1 is stopped so that the lower convex portion 11 is located on the left side in FIG. Similarly, the inner tube 2 is pierced to form the hole bending correction guide hole F.

In the case of the third mode in which drilling is performed with the tip of the inner tube 2 protruding outward from the tip of the outer tube 1, the current drilling hole position is the tip position of the inner tube. Similarly, drilling is performed while the inner pipe 2 is further advanced from the current drilling tip position to form a hole bending correction guide hole F in an undrilled region and correct the direction.

[0020]

As described in detail above, according to the present invention, without using any special hole bending correction jig or device,
It is possible to quickly and effectively correct the generated hole bending while drilling with the double pipe rod.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view of a double pipe rod according to the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

FIG. 3 is a view taken along line III-III in FIG. 1;

FIG. 4 is a cross-sectional view showing another example of the shape of the inner tube diameter increasing portion.

FIG. 5 is a cross-sectional view showing another example of the shape of the outer tube convex portion.

FIG. 6 is an explanatory diagram of a hole bending correction procedure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer pipe, 2 ... Inner pipe, 3 ... Inclinometer, 10 ... Upper convex part,
11: Lower-side convex portion, 20: Upper-side increased diameter portion, 21: Lower-side increased diameter portion, F: Hole bending correction guide hole, R: Double pipe rod

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21B 7/10 E21B 7/20 E21B 17/10

Claims (3)

(57) [Claims] At the distal end of the outer tube, an upper convex portion and a lower convex portion are formed on the inner surface of the outer tube at different positions in the longitudinal direction of the tube and on opposite sides thereof. On the distal end side, on the outer surface of the inner tube, a diameter-increasing portion having a substantially larger tube outer diameter is formed in an upper region corresponding to the upper-stage convex portion corresponding position and an upper region corresponding to the lower-stage convex portion corresponding position. When the inner tube is advanced, the inner tube axis at the rod tip portion with respect to the outer tube axis at the rod tip portion by contact between the upper and lower convex portions of the outer tube and the inner tube diameter increasing portion. The double pipe rod is configured so as to be inclined, and if hole bending occurs during drilling with the double pipe rod, only the inner pipe is drilled from the current drilling tip position with the outer pipe stopped. And forming a hole bending correction guide hole toward the hole bending correction direction in the undrilled area. Hole bending correction method in the double pipe rod drilling to. 2. After forming the hole bending correction guide hole,
2. The method according to claim 1, wherein the inner pipe is once returned to its original position, and then the hole is formed by the double pipe rod. 3. An inner tube of an outer tube having an upper convex portion and a lower convex portion formed on the inner surface of the outer tube at different positions in the longitudinal direction of the outer tube and on opposite sides of the outer tube. On the distal end side, on the outer surface of the inner tube, a diameter-increasing portion having a substantially larger tube outer diameter is formed in an upper region corresponding to the upper-stage convex portion corresponding position and an upper region corresponding to the lower-stage convex portion corresponding position. When the inner tube is advanced, the inner tube axis at the rod tip portion with respect to the outer tube axis at the rod tip portion by contact between the upper and lower convex portions of the outer tube and the inner tube diameter increasing portion. A double tube rod characterized by being inclined.