JPH0233830B2 - BOORINGUNIOKERUKUTSUSAKUKONOMAGARISHUSEIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a single-pipe drilling method for correcting the curvature of a borehole during boring.

[Conventional technology]

In order to horizontally excavate the foundations of industrial equipment such as blast furnaces and converters, or the foundations of factory buildings, it is proposed to use an excavator inserted into a double pipe consisting of an outer pipe and an inner pipe. This is proposed in the official gazette, Japanese Patent Publication No. 53-26202. This conventional excavator is shown in Figure 6a. Tip bit b via air hammer a
Insert the excavator made by attaching the rod c to the double pipe consisting of the outer pipe d and the inner pipe e, and
The excavator is pushed inward to dig while removing air from the gap f between the excavator and the excavator. In addition, in the figure,
g indicates a shield crown, by which a cylindrical excavation is made around the tip bit b.

In such an excavation method using a double pipe, the direction of excavation is corrected by a correction guide h and a pilot drill pipe i provided on the inner wall of the outer pipe, as shown in FIG. 6b.

[Problem that the invention seeks to solve]

However, excavators inserted into double pipes are not suitable for excavating in narrow places. That is, since it is a double pipe, it is not possible to form a small diameter excavation hole. This means that the excavator cannot be used to drill a new borehole, especially where a large number of pipes are already buried.

Therefore, a single-tube excavator was developed to perform excavation work in confined spaces. However, this single-tube excavator does not have a direction adjustment function, so if the excavation direction deviates from the specified direction, either stop the excavation operation and start a new excavation operation in another location, or After the hole was backfilled, drilling had to be restarted again. Such deviations in the excavation direction often occur, and it is extremely disadvantageous in terms of time and economy to repeat the excavation work each time. Further, when highly accurate excavation is required that cannot deviate from a predetermined direction, it becomes impossible to continue excavation using the above-mentioned excavation method.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for quickly, accurately, and smoothly correcting the direction of excavation when the direction of excavation deviates during horizontal single-pipe excavation.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention connects a tip bit with an operating air hammer to a rod and rotates it to perform horizontal excavation of a single pipe.
For correction, when the digging direction deviates from a predetermined direction, the tip bit and rod are pulled out, and a direction correction guide is provided that can come into contact with the air hammer part for operating the tip bit and has an air hammer exhaust passage. After inserting the tip bit and rod into the outer tube and fixing the air hammer part to the direction correction guide, reinsert the correction outer tube into the excavation hole and continue digging while rotating only the tip bit and rod. The method is to make corrections in a predetermined direction by doing this.

[Effect]

FIG. 2 shows a normal excavation condition.

A tip bit 1 driven by an operating air hammer 3 is attached to the tip of a small diameter rod 2 having a diameter smaller than that of the tip bit 1, and excavation work is performed while rotating the small diameter rod 2. When this excavation deviates from the predetermined direction of excavation, the amount of deviation is measured and the correction guide 4 is adjusted according to the measurement result.
Correct the direction of excavation by This modification guide 4
is provided near the tip of the outer correction tube 5, as shown in FIG. The tip bit 1 and the small-diameter rod 2 are inserted into the outer tube for correction 5 so that the actuating air hammer 3 of the tip bit 1 comes into contact with the correction guide 4 in order to orient the tip bit 1 in a predetermined correction direction. In this way, inside the outer correction tube 5,
On one side, the actuating air hammer 3 contacts the correction guide 4, and on the other side, the small diameter rod 2 contacts the correction outer tube 5.
It is inscribed on the inner peripheral surface of. The correction guide 4 has the same curvature as the small diameter rod 2, and extends over about half, preferably 40 to 60%, of the inner circumference of the outer correction tube 5 in order to stably hold the operating air hammer 3. It extends. In this way, the small diameter rod 2
The axis of the tip bit 1 connected to the tip is corrected in a predetermined digging direction. In this state, the excavator is inserted into the already excavated hole, and the excavation work is resumed with the outer pipe 5 for correction fixed. That is, while the tip bit 1 is oriented in a predetermined correction direction, the excavation work is continued by striking with the tip bit 1 and rotating the small diameter rod 2. Here, the correction guide 4 is provided with an exhaust passage 6 for discharging air from the air hammer 3, as shown in FIG. After digging a certain distance, confirm that corrections have been made in the specified direction,
The correction outer tube 5 is pulled out from the excavation hole, the excavation is returned to the normal excavation shown in FIG. 2, and the excavation is further continued for a predetermined distance.

〔Example〕

As shown in Fig. 4, there is a steel plate 7 above and existing pipes 8 and 9 on the left and right, so the concrete structure 10 is surrounded by obstacles on three sides, and is horizontally located 10 mm below the steel plate 7 above. Digged 10m. At that time, the direction of excavation should be corrected as shown in Figure 5 a and b.
The correction guide 4 was inserted as shown in FIG. 3, and the correction guide 4 was inserted as shown in FIG. With this modification, it was possible to form an excavation hole in a predetermined direction without damaging the steel plate 7 and the existing pipes 8 and 9.

〔Effect of the invention〕

As explained above, in the present invention, by using a modified guide provided with an air hammer exhaust path, it is possible to excavate a single pipe horizontally over a long route, and avoid obstacles buried in narrow places. It became possible to continue drilling small holes.
As described above, the present invention exhibits a great effect in easily installing a new conduit in the foundation of a large-scale production facility or a large-scale structure.

[Brief explanation of drawings]

Fig. 1 shows a state in which a rod having a tip bit with an air hammer for operation is fixed to an outer pipe for correction in an embodiment of the present invention, Fig. 2 shows a normal excavation state of single pipe excavation, and Fig. 3 Figures a and b show the positions of the correction guides when making corrections in the vertical and horizontal directions, respectively, Figure 4 shows a cross section of the place where horizontal excavation was performed, and Figures 5 a and b show the positions of the correction guides when making corrections in the vertical and horizontal directions, respectively. Show the correction results. Moreover, FIGS. 6a and 6b are conceptual diagrams showing a correction method in conventional double pipe excavation.

Claims (1)

[Claims] 1. When a tip bit with an operating air hammer is connected to a rod and rotated to perform horizontal excavation of a single pipe, if the direction of excavation deviates from the predetermined direction, pull out the tip bit and rod, and then The tip bit and rod are inserted into a correction outer tube provided with a direction correction guide that can come into contact with the air hammer section for operating the tip bit and has an air hammer exhaust passage, and the air hammer section is inserted into the direction correction guide. After fixing the hole, the correction outer tube is reinserted into the hole, and the hole is corrected in a predetermined direction by drilling while rotating only the tip bit and the rod. How to fix.