JPH06100468B2 - Measuring method of oblique hole displacement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method of measuring a displacement of an oblique hole for measuring the displacement of an oblique hole.

<Prior Art> Since the direction control when excavating an oblique hole is determined only by the pressing load in the oblique direction, the direction of the hole is likely to change.

Then, once the perforation is largely displaced, there is no means for correcting the perforation direction, so the perforation must be performed again by increasing the hole diameter.

In order to avoid such a situation, it is necessary to constantly monitor the displacement of the drilling during the drilling and correct the displacement while the displacement amount is small.

Conventionally, the following measuring methods exist for measuring the displacement of perforations.

(A) A method of using an inclinometer such as an insertion type inclinometer or a fixed type inclinometer.

(B) A method of measuring using ultrasonic waves.

(C) A method of measuring using a wire displacement meter.

<Problems to be Solved by the Present Invention> Since all of the above-described measuring methods of displacement of perforations are measuring methods based on gravity, they are not suitable for measuring oblique holes, and it takes time to measure. Has the drawback of low measurement accuracy.

On the other hand, there are the following measurement techniques as the measurement techniques for the displacement of horizontal holes and oblique holes.

(A) Eastman method using a bell, magnet, and photograph.

(B) A borehole survey system using a gyro.

(C) A tube bending measuring method using a laser.

Since most of the three measurement techniques described above employ the integration method, there is a problem that it takes time to obtain a measured value and the measurement accuracy decreases as the hole approaches the vertical.

<Object of the present invention> The present invention has been made in order to solve the above problems, high-accuracy measurement values can be obtained in a short time,
Further, it is an object of the present invention to provide a method for measuring a perforation displacement that can be measured regardless of whether the perforation direction is horizontal or vertical.

<Structure of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Measuring method (fixed type) [Devices used] FIGS. 1 and 2 show devices for measuring displacement of oblique holes according to the present invention.

In the figure, 1 is a roller bit which is a boring means, 2 is a drill pipe provided with a soil discharging means, 3 is a swivel pipe, and a boring device for boring while excavating the roller bit 1 while supporting the swivel pipe 3.

A single pseudo pipe 4 is attached to the outer circumference of the drill pipe 2 of this drilling device over the entire length.

The pseudo pipe 4 is made of a straight hollow pipe and is arranged in parallel with the axis of the drill pipe 2 and attached.

At this time, the outer periphery of the pseudo pipe 4 is attached so as not to project from the outer diameter of the roller bit 1 for the purpose of preventing damage to the pseudo pipe 4.

Then, on the upper portion of the pseudo pipe 4, a laser light emitting device 5 that emits laser light in parallel with the drill pipe 2, both pipes 2,
An inclinometer 6 for measuring the inclination angle of 4 is provided.

Further, a target 7 and a camera 8 for detecting a light receiving point of the target 7 are attached to the lower portion of the pseudo pipe 4.

A battery is used as a power source for the above devices, and a method in which measured data is converted into an electric signal and transmitted by wireless or inductive wireless is adopted.

[Measurement Method of Transition] When the roller bit 1 is rotated to start drilling, the drill pipe 2 and the pseudo pipe 4 integrated with the roller bit 1 also rotate.

When laser light is emitted from the laser emitting device 5 during this perforation,
A laser spot is projected on the target 7 and detected by the camera 8.

The displacement of the tip of the drill pipe 2 is measured based on the detected data.

That is, since the target 7 rotates with the drill pipe 2, the trajectory of the laser spot on the target 7 draws a concentric circle that coincides with the rotation center of the drill pipe 2.

Therefore, when the drill pipe 2 travels straight as designed, the laser spot on the target 7 is present at the initially set center.

Further, when the laser spot is located away from the center of the target 7, it means that the tip of the drill pipe 2 is drilled off the planned drilling line, and the presence of the laser spot from the center of the target 7. The distance to reach the point is the amount of displacement of the tip of the drill pipe 2.

Further, if the rotation of the drill pipe 2 is stopped for a few minutes until the inclinometer 6 stabilizes even during drilling, the amount of displacement and the displacement direction from the planned drilling line are determined from the inclination angle of the laser beam and the position of the laser spot on the target 7. Can be measured.

That is, the pseudo pipe 4 is integrally attached in parallel with the axis of the drill pipe 2.

Therefore, the measurement data obtained by measuring the displacement of the pseudo pipe 4 can be directly used as the displacement of the drill pipe 2.

[Processing of measurement data] If the data measured as described above is recorded for each depth, the trajectory of the entire drilling can be grasped.

In addition, the measurement signal of the camera 8 can be input to a device such as a computer or plotter having a known analysis capability to perform numerical processing, graphic processing, or recording work very easily.

<B> Measuring Method 2 (Float Type) [Device Used] The measuring method described above was a method of fixing the target 7 to the tip of the drill pipe 2 and measuring the displacement of only the tip portion of the drill pipe 2.

Other measurement methods are shown in FIGS.

In the description of this measuring method, the same equipment as the above-mentioned fixed measuring apparatus is designated by the same reference numeral, and the description thereof is omitted.

This measuring method is a method of moving the target 7 to an arbitrary position on the peripheral surface of the drill pipe 2 and continuously measuring the displacement of the drill pipe 2.

Specifically, a pseudo pipe 41, which is a U-shaped thin pipe bent around the outer periphery of the drill pipe 2, is fixed to the outer periphery of the drill pipe 2.

A liquid 43 such as water is stored in the pseudo pipe 41, and a buoyant body 9 in which the target 7 and the camera 8 are integrally attached is stored in the pseudo pipe 41.

The laser light emitting device 5 is arranged at the upper opening of the pseudo pipe 41 on the side where the buoyant body 9 is accommodated, and pressure air is supplied from this upper opening so that the water level of the liquid 43 on which the buoyant body 9 floats can be adjusted. Constitute.

Then, the wire reel type encoder 10 is arranged at the other upper opening of the pseudo pipe 41, and the free end of the wire 44 extending from the encoder 10 is connected to the buoyancy body 9.

The encoder 10 is a measuring device intended to measure the depth of the target 7.

[Measurement method of displacement] During drilling, one of the pseudo pipes 41 is pressed to press the target 7
Is moved close to the roller bit 1 and the same measurement as the above-described measurement method is performed. When it is desired to obtain the absolute amount of displacement, the rotation of the drill pipe 2 is stopped, the buoyant body 9 is moved up and down in the pseudo pipe 41 during this period, and the displacement is measured over almost the entire length of the drill pipe 2.

That is, the depth of the target 7 is confirmed by the encoder 10, and the bend of the pipe is measured for each depth without moving the drill pipe 2 up and down.

The method of processing the measurement data measured for each depth is as described above.

In this way, the displacement amount and the displacement direction are grasped over the entire area of the perforation, and the perforation direction is corrected as needed based on the measurement data.

<Other Embodiments> The above-described measuring methods are described for the case where the pseudo pipe 4 is arranged on the outer circumference of the drill pipe 2, but the pseudo pipe 4 equipped with a measuring device is arranged on the inner circumference side of the drill pipe 2. It is also possible to do so.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

(B) This is a method of measuring the displacement of the oblique hole by measuring the bend of a separate pipe attached on the outer circumference of the drill pipe for drilling the oblique hole.

Moreover, since the laser light is used as the measuring means, it is not affected by gravity at all.

Therefore, the displacement of the oblique hole can be accurately measured.

(B) When measuring the displacement, since the laser spot on the target is only detected and processed, the measured value can be obtained almost instantaneously in a short time.

(C) The amount of displacement of the oblique hole can be measured even during drilling work.

[Brief description of drawings]

 1 is an explanatory view of an embodiment of the present invention. FIG. 2 is an enlarged view of a main part of the present invention. FIG. 3 is an explanatory view of another measuring method. Explanatory drawing of part

Claims (1)

[Claims] 1. When drilling an oblique hole using a drilling device having a drilling portion at the tip of the drill pipe, the drill pipe is in a state parallel to the axis of the drill pipe and within the rotation range of the drilling portion. The pseudo pipe that rotates together with the drill pipe accommodates the target, and the upper part of the pseudo pipe emits a laser beam toward the target. An inclinometer that detects the tilt angle is installed, the displacement of the pseudo pipe is detected from the displacement of the laser spot on the target, and the displacement of the pseudo pipe is replaced by the displacement of the drill hole. Measuring method