JP2017025477A - Hole route measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hole route measuring method for preventing the occurrence of a large change in an attitude of a sensor probe, when pulling the sensor probe toward a base end part of a hole drilling pipe.SOLUTION: A hole route measuring method is provided for measuring a hole route while transferring a sensor probe 20 in the inverse direction in an inner hole 111 of a hole drilling pipe 11, after guiding up to a tip part of the hole drilling pipe 11 by pushing the sensor probe 20 in the hole drilling pipe 11, after inserting the hollow hole drilling pipe 11 into the ground while excavating by a hole drilling bit 12, and executes a preparation process of connecting a bar 33 for pushing the sensor probe 20 in the hole drilling pipe 11, to the sensor probe via a jig 30 of an external shape larger than an external shape of the sensor probe, an introduction process of guiding the sensor probe up to a tip part of the hole drilling pipe 11 by push-in operation of the bar 33 and a measuring process of measuring the hole route while transferring the sensor probe in the inverse direction together with the jig 30 in an integrated fashion, by pulling a cable 23 of the sensor probe.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a hole path measuring method for measuring a hole path of an inner hole of a drilled pipe inserted into the ground by excavation with a drill bit.

Conventionally, for ground improvement work, such as preventing liquefaction of the ground, a work hole is formed in the ground from the surface, and chemicals etc. are injected through this hole to prevent movement of soil pore water into the ground. To be done.
In order to perform this ground improvement work on the foundation ground under the building, as a method of forming a work hole, curved hole drilling is performed obliquely from the ground surface around the target building downward to the building, and then horizontal A curved boring method is known in which straight drilling is performed by changing the direction.

  In the bending boring method, a drilling device in which a tip bit is connected to a tip portion of a drilling tube is used. This drilled tube is a hollow tube that can be bent, and is formed by connecting a plurality of tubes in the insertion direction so as to sequentially add in accordance with the depth of insertion into the ground. (Patent Document 1).

  In the bending boring method, the drilling path is measured in order to confirm whether the drilling is performed in a desired path. For measurement, after inserting the sensor probe from the opening at the proximal end of the drill tube to the tip of the drill tube, initializing the sensor provided in the sensor probe, the sensor probe is moved at a constant speed. This is done by pulling to the base end and shifting.

JP 2013-209827 A

Sensors such as accelerometers and angular velocity meters provided in the sensor probe tend to cause measurement errors due to a sudden change in the attitude of the sensor probe. For this reason, when measuring the drilling path, it is required that there is no sudden change in the posture of the sensor probe.
However, since the drilled tube connects a plurality of cylindrical bodies, the inner wall surface may not be continuous at the connecting portion of adjacent cylindrical bodies, and a step may be generated. Moreover, the chemical | medical agent etc. which were supplied in the drilling pipe | tube solidify and adhere to the inner wall of a drilling pipe | tube, and may become a level | step difference. In the measurement of the drilling path, there is a problem that when the sensor probe is pulled toward the base end of the drilling tube, the sensor probe is caught by a step and jumps and suddenly moves in the radial direction, resulting in a large error in the measured value. there were.

  The present invention has been made paying attention to the above-described problems, and is a hole path measurement that prevents a large change in the attitude of the sensor probe when the sensor probe is pulled toward the base end of the drilled tube. It aims to provide a method.

  In the hole path measuring method of the present invention, a hollow drill tube having a drill bit at the tip is inserted into the ground while being drilled by the drill bit, and then the base of the drill tube is inserted into the inner hole of the drill tube. The sensor probe is pushed from the end opening and guided to the tip of the drilling tube, and then the sensor probe is used to measure the hole path while moving the inner hole of the drilling tube in the reverse direction. A preparatory step of connecting a flexible bar for pushing the sensor probe into the inner hole of the drilling tube to the rear end of the probe via a jig having an outer shape larger than the outer shape of the sensor probe; Introducing the sensor probe, which is inserted into the inner hole of the drilling tube from the opening of the base end of the drilling tube, to the tip of the drilling tube by pushing the rod, and passing through the inner hole of the drilling tube. Sensor pulled out from the rear end opening A measuring step of measuring the hole path while moving the inner hole of the drilling tube in the reverse direction with the jig integrated with the jig by pulling the cable of the lobe, This object is achieved by this pore path measurement method.

  According to the above configuration, when the hole path is measured, the sensor probe cable is pulled in the inner hole of the drilled tube, so that the sensor probe integrally pushes the jig having an outer shape larger than its own outer shape. It moves in the opposite direction. At this time, a force in the direction opposite to the pulling force of the cable acts on the sensor probe due to the rod connected through the jig, and the weight of the jig and the rod are added to the sensor probe. Even if the main body of the sensor probe or the jig is caught on the step of the inner hole of the drilling tube, the sensor probe is less likely to jump. In addition, even if it is bounced, a jig whose outer shape is larger than the outer shape of the sensor probe hits the inner wall surface of the drilling tube, so the radial displacement of the sensor probe is the distance between the jig and the inner wall surface of the drilling tube. Therefore, it is possible to prevent a significant change in the posture of the sensor probe.

  In a preferred embodiment, the sensor probe includes a main body portion, a cable, and a connector portion for connecting the cable to the main body portion, and the jig includes a main body portion that covers the connector portion. A connecting portion to which the bar is connected is integrally formed with a cylindrical portion having an outer shape larger than the outer shape.

  According to the hole path measuring method according to the present invention, when the hole path is measured, the sensor probe cable is pulled in the inner hole of the drilled tube, so that the sensor probe is integrated with a jig having an outer shape larger than its own outer shape. Along with this, the direction is shifted in the direction opposite to the pushing direction. At this time, a force in the direction opposite to the tensile force caused by the cable is applied to the sensor probe by a bar connected via a jig, and the weight of the jig or bar is applied to the sensor probe. Even if the main body or jig of the sensor probe is caught on the step of the inner hole of the hole tube, the sensor probe is difficult to jump. In addition, even when it is bounced, a jig with an outer shape larger than the outer shape of the sensor probe hits the inner wall surface of the drilling tube, so the displacement of the sensor probe is suppressed to the distance between the jig and the inner wall surface of the drilling tube, It is possible to prevent a great change in the posture of the sensor probe.

It is the schematic which shows the whole structure of the drilling apparatus using the hole path | route measuring method which concerns on one Embodiment of this invention. It is sectional drawing which shows the state which attached the jig to the sensor probe. It is a front view of a jig. It is sectional drawing which shows the other example of a jig. It is a front view of the example of FIG. It is a front view which shows the other example of a jig.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view showing the overall configuration of a drilling device 10 used in a hole path measuring method according to the present invention, FIG. 2 is a sectional view of a state in which a jig 30 is attached to a sensor probe 20, and FIG. FIG.
In the following description, the direction in which the drilled tube 11 of FIG. 1 is inserted into the ground is the front end side, and the proximal end side of the drilled tube 11 is the rear end side. In other drawings, description will be made based on these.

The drilling device 10 includes a hollow drilling tube 11 and a drilling bid 12 provided at the tip of the drilling tube 11.
The hole drilling tube 11 can be bent and has an inner hole 111 into which various liquids can be supplied and various instruments can be inserted. This drilled tube 11 is formed by sequentially connecting a plurality of cylindrical bodies having a length of about 1.5 m to 3 m in the insertion direction according to the depth of insertion into the ground. Yes. In this connection part, the inner wall surface of the adjacent cylindrical body may not be continuous, and a step P may occur. Moreover, the chemical | medical agent etc. which are supplied in the hole-drilling pipe 11 solidify and adhere to the inner wall of the hole-drilled pipe 11, and may become the level | step difference P. FIG.

  In the hole path measuring method of the present invention, after the drilling tube 11 is inserted into the ground while being drilled by the drilling bid 12, the opening 112 at the proximal end of the drilling tube 11 is inserted into the inner hole 111 of the drilling tube 11. After the sensor probe 20 is pushed in and guided to the tip of the drilled tube 11, the hole path is measured while moving the sensor probe 20 in the direction opposite to the pushing direction (rear end side).

As shown in FIG. 2, the sensor probe 20 includes a main body portion 21, a connector portion 22, and a cable 23.
The main body portion 21 has a cylindrical shape, and an accelerometer and an angular velocity meter for measuring the hole path are disposed therein.

  The connector portion 22 has a cylindrical shape and is connected to the rear end portion of the main body portion 21. As shown in FIG. 2, the rear end portion of the connector portion 22 is tapered and has a conical shape, and a tapered surface 221 is formed in a cross section in the length direction.

  One end of a cable 23 is connected to the rear end portion of the connector portion 22. The cable 23 is formed by covering a plurality of signal lines with an insulator, and the signal lines of the cable 23 are connected to the accelerometer and the angular velocity meter of the main body 21. When the sensor probe 20 is pushed into the drilling tube 11, the cable 23 passes through the inner hole 111 of the drilling tube 11 and is pulled out from the opening 112 at the rear end, and the other end of the cable 23 is installed on the ground surface. The cable 23 is connected to a winder 24. The cable 23 is connected to a measuring machine (not shown) such as a personal computer that measures data from an accelerometer or an angular velocity meter.

As shown in FIGS. 2 and 3, the jig 30 includes a cylindrical portion 31 and a connection portion 32 that are integrally formed.
The cylindrical portion 31 is a cylindrical body having a diameter larger than the outer shape of the main body portion 21 of the sensor probe 20, and an inner hole 311 corresponding to the shape of the connector portion 22 is formed therein. It is put on. The outer diameter of the cylindrical portion 31 is smaller than the inner diameter of the drilled tube 11 so as to be able to move through the drilled tube 11, but is set as large as possible.
As shown in FIG. 3, a cutout portion 312 is provided at the lower end of the tubular portion 31 by cutting out a portion of the tubular portion 31 over the entire length in the length direction. The notch 312 communicates with the inner hole 311 and allows the cable 23 to pass therethrough.

The connecting portion 32 is formed at the rear end of the cylindrical portion 31 continuously to the cylindrical portion 31 and has a semi-cylindrical shape having the same diameter as the cylindrical portion 31. The front end of the bar 33 is connected to the rear end of the connecting portion 32.
The rod 33 has rigidity in the length direction in order to push the sensor probe 20 into the inner hole 111 of the drilling tube 11, and is flexible so as to follow the drilling tube 11 inserted by bending in the ground. It has sex.
The rear end of the bar 33 is connected to a winder 34 for the bar 33 installed on the ground surface.
The bar 33 is made of a material that hardly twists when the sensor probe 20 is pushed in or wound by the winder 34, and is made of, for example, glass fiber or carbon.

The hole path measuring method of the present invention for measuring the hole path of the inner hole 111 of the hole drilling pipe 11 of the hole drilling apparatus 10 will be described.
First, in the preparation step, the cable 23 of the sensor probe 20 is passed through the inner hole 311 through the notch 312 of the cylindrical portion 31 of the jig 30, and the jig 30 is moved to the connector portion 22 from the rear end side. The cylindrical portion 31 of the jig 30 is fitted. Thereby, the bar 33 is connected to the rear end portion of the sensor probe 20 via the jig 30.
Next, in the process of introducing the sensor probe 20, the sensor probe 20 is inserted into the inner hole 111 of the drilled tube 11 through the opening 112 at the proximal end portion of the drilled tube 11. The taper surface 221 of the sensor probe 20 is pushed against the inner wall surface of the inner hole 311 of the jig 30 by the pushing operation of the bar 33 connected to the jig 30, and the sensor probe 20 is guided to the distal end portion of the drilled tube 11. .

  Next, in the measurement process, when the cable 23 of the sensor probe 20 drawn from the rear end opening 112 through the inner hole 111 of the drilled tube 11 is pulled, the tapered surface 221 of the sensor probe 20 becomes the jig 30. The inner wall surface of the inner hole 311 is pushed, and the sensor probe 20 moves the inner hole 111 of the drilled tube 11 in the reverse direction with the jig 30 integrally. The hole path is measured by a sensor provided in the sensor probe 20 during the transfer of the sensor probe 20. The cable 23 drawn out from the opening at the rear end of the hole drilling tube 11 is sequentially wound up by a winder 24. Since the bar 33 connected to the jig 30 is also sequentially drawn out from the opening at the rear end of the drilled tube 11, it is wound up by the winder 34.

  According to the present invention, in such a measurement process, when the main body 21 or the jig 30 of the sensor probe 20 is caught by the step P generated on the inner wall of the drilled tube 11, the sensor probe 20 has the jig 30. The weight of the rod 33 and the weight of the rod 33 are added, and the sensor probe 20 is subjected to a force in a direction opposite to the pulling force by the cable 23 by the rod 33 connected via the jig 30. Is less likely to bounce. In addition, since the jig 30 having an outer shape larger than the outer shape of the sensor probe 20 hits the inner wall surface of the drilling tube 11 even when it bounces, the displacement of the sensor probe 20 is between the jig 30 and the inner wall surface of the drilling tube 11. It is possible to prevent the sensor probe 20 from undergoing a great change in the posture by being controlled by the distance.

Further, when the cable 23 is formed by twisting a plurality of strands, the cable 23 is likely to be twisted. For this reason, in the prior art, when the sensor probe 20 is moved by pulling the cable 23 during measurement of the drilling path, the sensor probe 20 rotates around the axis due to the twist of the cable 23, and a measurement error may occur.
However, in the present invention, the sensor probe 20 moves through the inner hole 111 of the drilled tube 11 with the bar 33 connected via the jig 30, and the bar 33 is a material that is not easily twisted. Therefore, the rotation of the sensor probe 20 is suppressed by the bar 33, and a measurement error due to the rotation of the sensor probe 20 can be prevented.

  In addition, since the sensor probe 20 is less likely to spring and the attitude of the sensor probe 20 is not significantly changed, the cable 23 is less likely to sag inside the drilled tube 11, and damage due to kinking or the like of the cable 23 is prevented. Can do.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning of this invention.
For example, in the present embodiment, the inner hole 311 formed in the cylindrical portion 31 of the jig 30 is formed in the central portion of the cylindrical portion 31, but the inner hole 311 is similar to the jig 40 shown in FIGS. 4 and 5. The hole 411 may be formed on one side (on the lower end side in FIG. 4) from the center of the cylindrical portion 41 in a cross section perpendicular to the length direction.
Further, the cross section in the direction perpendicular to the length direction of the cylindrical portion 31 of the jig 30 is not limited to a circle, and is perpendicular to the length direction as in the cylindrical portion 51 of the jig 50 shown in FIG. The cross section in the direction may be a rectangle or another shape.

DESCRIPTION OF SYMBOLS 10 Drilling apparatus 11 Drilling pipe 111 Inner hole 12 Drilling bid 20 Sensor probe 21 Main body part 22 Connector part 23 Cable 30,40,50 Jig 31,31,51 Cylindrical part 311,411 Inner hole 32 Connection part

Claims (2)

A hollow drilling tube having a drilling bid at the tip is inserted into the ground while drilling with the drilling bid, and then the sensor probe is pushed into the inner hole of the drilling tube from the opening at the base end of the drilling tube. In the hole path measuring method for measuring the hole path while guiding the sensor probe to the inner hole of the drilling pipe in the reverse direction after guiding to the tip of the drilling pipe with
A preparatory step of connecting a flexible bar for pushing the sensor probe into the inner hole of the drilling tube to the rear end of the sensor probe via a jig having an outer shape larger than the outer shape of the sensor probe;
A sensor probe introducing step for guiding the sensor probe inserted into the inner hole of the hole drilling tube from the opening of the proximal end of the hole drilling tube to the tip of the hole drilling tube by pushing the bar;
By pulling the cable of the sensor probe drawn out from the opening at the rear end through the inner hole of the drilling tube, the sensor probe is moved in the reverse direction of the inner hole of the drilling tube along with the jig. And a measuring step of measuring the hole path while performing the hole path measuring method.   The sensor probe includes a main body portion, a cable, and a connector portion for connecting the cable to the main body portion, and the jig is a cylinder having an outer shape larger than the outer shape of the main body portion covered on the connector portion. The hole path measuring method according to claim 1, wherein a connection portion to which the bar is connected to the shape portion is integrally formed.

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