JPH09236430A - Measuring method for precision of multi-axis drilling shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring precision of a multi-axis drilling shaft wherein high precision measurement is done rapidly. SOLUTION: A binding case 20 which binds three drilling shafts 12, 14 and 16 together is provided with a twist measurement sensor member. A measurement equipment 42 containing an inclination measurement sensor which detects inclination amount and a twist measurement sensor which detects the rotation angle of the binding case 20 are inserted into a drilling shaft 14 at the center, and, the inclination angle of the central drilling shaft 14 and the rotation angle of the binding case 20 are measured. As a result, the inclination and twist of drilling shafts 12, 14 and 16 are measured, and, construction state of an underground continuous wall constructed with a multi-axis drilling shaft 10 is grasped. Further, since measurement is done by lowering the measurement equipment 42 without detaching the joint of multi-axis drilling shaft, rapid measurement is allowed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the accuracy of a multi-axis excavation axis, and more particularly to a method for measuring the accuracy of a multi-axis excavation axis by measuring the tilt angle and the twist angle of the multi-axis excavation axis in the ground.

[0002]

2. Description of the Related Art When a soil mixing underground continuous wall is created by a multi-axis excavator and a mountain retaining wall or a water blocking wall that is solidified with cement milk and in-situ sand is formed, individual underground continuous walls are used. If it is not constructed in the correct position, the retaining wall and the water blocking wall will have mechanically weak points and the water blocking effect will be incomplete. For this reason, when constructing a deep underground wall with a depth of about 50 m on a multi-axis excavation axis, the underground continuous wall is inclined at a predetermined depth so that the underground continuous wall is constructed at an accurate position. It is necessary to measure the angle and the twist angle.

In this measurement work, an inclinometer with a built-in inclination angle sensor is inserted into the shafts at both ends of the multi-axis excavation shaft, and the inclination angle and twist of the underground underground wall are calculated from the inclination amount of the shafts at both ends at a predetermined depth. I was measuring the angle.

[0004]

However, the above-mentioned conventional measuring work has a drawback in that it takes time to perform the measurement because it is necessary to measure the two axes at both ends. In addition, there is a drawback in that workability is problematic because cleaning is required because the measuring device is placed in the shaft containing cement milk.

The present invention has been made in view of the above problems, and an object thereof is to provide a method for measuring the accuracy of a multi-axis excavation shaft, which can measure the accuracy of a continuous underground wall with high accuracy and speed. And

[0006]

In order to achieve the above-mentioned object, the present invention provides a multi-axis measuring method for measuring inclination and twist of a multi-axis drilling shaft in which a plurality of drilling shafts are bound by a binding member in a rotatable and parallel manner. In the method for measuring the accuracy of a shaft excavation axis, one of the multi-axis excavation axes is used as a measurement axis, and a sensor member for detecting a twist amount with respect to a reference position of the measurement axis is provided. A binding case that binds the shaft excavating shaft, and a measuring instrument that can be inserted into the measurement axis center and that measures the tilt amount of the measurement axis and the twist amount of the binding case, and the measuring instrument It is characterized in that it is inserted up to the measurement position of the binding case and the tilt amount of the measuring shaft and the twist amount of the binding case are measured.

According to the present invention, accuracy measurement of a multi-axis excavation axis is performed as follows. First, a measuring instrument is inserted into one axis of the multi-axis excavation axis, and the inserted measuring instrument is moved to the measurement position.
Then, at the measurement position, the measuring device measures the tilt amount of the measurement axis and the twist amount of the binding case with respect to the reference position of the measurement axis. If the tilt amount of the measurement axis and the twisting amount of the binding case with respect to the reference position of the measurement axis are known, the state of the multi-axis excavation axis in the ground can be grasped, and as a result, the formation state of the underground continuous wall can be known. You can

Further, the measuring instrument is mounted on a multi-axis excavator that drives a multi-axis excavating shaft via a cable reel during excavation, and at the time of measurement, the inside of the excavation pipe is lowered to the bundling case so that workability is improved. The feature is that the measurement time is fast.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for measuring the accuracy of a multi-axis excavation shaft according to the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a configuration diagram of a first embodiment of a multi-axis excavation shaft to which the accuracy measuring method for a multi-axis excavation shaft according to the present invention is applied.
As shown in the figure, the multi-axis drilling shaft 10 is composed of three drilling shafts 12, 14, and 16.
2, 14, and 16 are binding bands 18 and binding cases 20.
Are connected so that their respective axial centers are arranged in a substantially straight line. The upper ends of the respective units are connected to a multi-axis excavator (not shown).

Bits 22, 24 and 26 are provided at the tip ends of the excavating shafts 12, 14 and 16, respectively. Bits 22, 24, and 26 are arranged in a staggered manner so that a part of their rotation loci overlap each other. By rotating these bits 22, 24, and 26, a bead-shaped drill hole is drilled in the ground. To be done. Further, the binding case 20 is provided with wall cutters 28, 28 which rotate in association with the rotation of the excavation shafts 12, 14, 16, and the bit is rotated by the wall cutters 28, 28 rotating. A small-diameter portion (so-called ear portion), which is a lap portion of a bead-shaped excavation hole drilled at 22, 24, and 26, is excavated. Therefore, the bits 22, 2
The beaded-hole-shaped drilling holes drilled at Nos. 4 and 26 are formed into the drilling holes having an oval cross section.

Each of the three excavating shafts 12, 14, 16 is hollow inside. A liquid such as cement milk is supplied into the excavating shafts 12 and 16 at both ends of the three excavating shafts 12, 14 and 16, and the supplied liquid is the tip portions of bits 22 and 26 with check valves. Is jetted from. Compressed air is supplied into the central excavation shaft 14, and the supplied compressed air is ejected from the tip portion of the bit 24 as described above. Regarding the central excavation shaft 14, as shown in FIG. 2, for example, its hollow portion 14a is formed in a square shape. The hollow portion 14a is preferably a circular hole so that the measuring device 42 of the accuracy measuring device 34, which will be described later, can move up and down without rotating within the shaft.

Blade blades 30, 30, ... Are attached to the central excavation shaft 14 of the three excavation shafts 12, 14, 16.
Kneading blades such as auger blades 32, 32, ... Are arranged at predetermined intervals along the axial direction on the excavating shafts 12, 16 at both ends, and these blade blades 30, 30 ,. By rotating 32, ...
Excavated earth and sand excavated at 2, 24 and 26 and the bit 2
A liquid such as cement milk sprayed from the tip portions of 2, 26 is kneaded.

The multi-axis drilling shaft 10 is constructed as described above,
On the other hand, the accuracy measuring method applied to the multi-axis excavating shaft 10 is configured as follows. As shown in FIG.
2. It is composed of a cable reel 50 and a measuring unit 40. The measuring device 42 detects the tilt amount and the twist amount of the excavation shafts 12, 14, 16. The measuring instrument 42 is formed in a cylindrical shape, is inserted into the central excavation shaft 14 of the multi-axial excavation shaft 10 and slides in the shaft.

As shown in FIG. 3, four guide rollers 44, 44, ... Are arranged on the peripheral surface of the measuring device 42. On the other hand, the central excavation shaft 1 into which this measuring instrument 42 is inserted
4, the hollow portion 14a of the hollow portion 14a is formed into a rectangular shape, and when the measuring device 42 is inserted, the guide rollers 44 44, ... Contact. Therefore, the measuring device 42 is restricted from rotating in the circumferential direction by the guide rollers 44, 44, ...
It can move up and down in the hollow portion 14a without rotating.

Inside the measuring device 42, a tilt measuring sensor and a twist measuring sensor, which are not shown, are incorporated. The inclination measuring sensor is, for example, a differential transformer type inclinometer for two-way measurement (not shown), and detects the inclination amount of the central excavation shaft 14 by moving the wall surface of the hollow portion 14a.

On the other hand, the twist measurement sensor detects the twist angle of the binding case 20 with respect to the excavation shaft 14, and the detection is performed as follows. That is, the three drilling shafts 1
If the binding case 20 that binds 2, 14, 16 is twisted by the resistance of earth and sand, the binding case 20 will be
It rotates around the central excavation shaft 14. Therefore, if the rotation angle about the central excavation shaft 14 of the binding case 20 is detected, the twist amount of the binding case can be detected.

As shown in FIGS. 2 and 3, the binding case 2
At 0, sensor members such as a pair of permanent magnets 46, 46 are provided so as to sandwich the central excavation shaft 14, and a magnetic field having a predetermined distribution is generated. This permanent magnet 4
Since 6, 6 are provided on the binding case 20, when the binding case 20 rotates, the rotation of the binding case 20 rotates on a concentric circle around the central excavation shaft 14. Therefore, the rotation angle of the binding case 20 can be detected by detecting the rotation angle of the permanent magnets 46, 46 with the torsion measuring magnetic sensor.

The detection values detected by the tilt measuring sensor and the torsion measuring sensor are converted into electric signals,
It is transmitted to the measurement unit 40 on the ground via the cable 48 connected to the measuring device 42. The cable reel 50 inserts the measuring instrument 42 to the position of the binding case 20 while measuring the insertion amount (depth).

As shown in FIG. 1, the measuring device 42 inserted in the shaft slides downward in the shaft by its own weight, but the cable 48 is connected to the measuring device 42 as described above. ,
The insertion amount is regulated by the feeding amount of the cable 48. The cable 48 is wound around a cable reel 50 installed on the ground, and the cable reel 50 is connected to a motor (not shown) capable of rotating in the forward and reverse directions. Then, by rotating this motor forward or backward, the cable 4
8 is adjusted, and the insertion amount of the measuring device 42 is adjusted.

Further, an encoder (not shown) is installed on the cable reel 50, and the cable 48 can be detected based on the number of rotations of the cable reel 50 detected by the encoder.
Is detected, and the insertion amount of the measuring device 42 is detected. Reference numeral 52 in the drawing is a guide reel, which is rotatably supported above the central excavating shaft 14 and guides the cable 48 into the central excavating shaft 48.

The measuring section 40 processes the detection data detected by the measuring device 42. The measuring unit 40 includes a personal computer 56 and a printer 58. The personal computer 56 calculates a tilt amount and a twist amount detection value transmitted through the cable 48, and outputs the detection value information to the printer 58. The personal computer 56 processes the detected value information and measures the accuracy of the multi-axis excavation shaft 10 from the tilt angles of the excavation shafts 12, 14, 16 and the twist angle of the binding case 20. The measurement result of the accuracy of the multi-axis excavation axis 10 and the position information of the measuring device 42 are printed out by the printer 58 via the personal computer 56 as appropriate.

The method for measuring the accuracy of the multi-axis excavation shaft configured as described above is as follows. When excavating, first, the reference coordinate axes (X _O , Y _O , Z _O ) are set. As shown in FIGS. 6 and 7, reference coordinate axes (X _O , Y _O , Z
_O ) indicates the excavation plan, and represents the state of the excavation axes 12, 14, 16 when there is no twist or inclination. In the figure,
The X _O and Y _O planes are set on the ground surface, and the axis center of the central excavation shaft 14 is the origin O. Also, each drilling shaft 1
The straight line passing through the axes of 2, 14, and 16 is the X _O axis, and the origin O
Y _O axis straight line perpendicular to the street X _O axis, passing through the origin O X
A straight line orthogonal to the _O , Y _O plane, that is, the axis of the central excavation shaft 14 is the Z _O axis.

By the way, the reference coordinate axes (X _O , Y _O ,
By setting the Z _O), a central drilling axis 14 Z _O
Along the axis and the axis of each excavation axis 12, 14, 16 is X
Drilling axes 12, 14, 16 if located on _O axis
It can be seen that is not inclined or twisted in the ground.
Therefore, the measurement is made on the Z of the axis L of the central drilling shaft 14.
Inclination angle γ _{O with} respect to _O axis, and each excavation axis 12, 1
A straight line S passing through the axes of 4 and 16, that is, the binding case 2
By measuring the rotational angle theta _O with respect to the X _O axis 0 can grasp the accuracy of the drilling axis 12, 14, 16 of the ground.

The measuring method will be described below. In the measurement, the measurement interval is determined in advance, and at that time, the excavation work is interrupted. First, after excavating the ground to a predetermined depth with the multiaxial excavation shaft 10, the temporary excavation work is interrupted. And each excavation axis 1
The multi-shaft excavator (not shown) connected to the upper ends of 2, 14, and 16 is released to move the multi-shaft excavator.

Next, the measuring instrument 42 is mounted on the central excavation shaft 14.
Insert from the end. The measuring device 42 is at the level of the binding case 20.
It is inserted up to
Can be Alternatively, the magnetic sensor of the binding case
The position of the binding case can also be known from the reaction. In addition, this
When inserting the
Measurement coordinate axis (X_S, Y_S, Z_S) Is the reference coordinate
Axis (X_O, Y_O, Z_O) Must match. this
Since the excavation shaft 14 rotates during excavation,
The measurement coordinate axis (X_S, Y_S, Z_S)But,
Reference coordinate axis (X_O, Y_O, Z_O) Rotate on top and slip
The measurement coordinate axis (X_S, Y_S,
Z_S) Is used as the reference coordinate axis (X_O, Y_O, Z
_O) Convert to the above value and try to match the two coordinate axes. sand
That is, as shown in FIG. 8, the hollow portion 14a of the excavation shaft 14
X on each of the two opposite sides_SAxis and Y_STake the axis. Soshi
This measurement coordinate axis (X_S, Y_S, Z_S) Reference coordinate axis
(X_O, Y_O, Z_O) With respect to
The value of is converted in advance and input to the personal computer 56 in advance.
As a result, the tilt measuring sensor and the torsion measuring sensor described later are provided.
The detection value detected by the sensor is the reference coordinate axis (X _O, Y_O,
Z_O) Can be obtained by converting to the above value.

[0026] Note that in Figures 2-7, the reference coordinate axes _{(X O, Y O, Z} O) and the measurement axis (X _S, Y _S,
Z _S ) is in agreement. Next, the measurement is started by the tilt measuring sensor and the torsion measuring sensor built in the measuring device 42. From the tilt measuring sensor,
As shown in FIG. 6, the inclination amount (angle γ) of the axis L of the central excavation shaft 14 with respect to the reference Z _O axis and the inclination direction thereof are detected.

On the other hand, as shown in FIG. 7, the twist measurement sensor detects the rotation angle θ _S of the binding case 20 on the measurement coordinate axes (X _S , Y _S , Z _S ). This detection is performed by the permanent magnet 4 that rotates with the rotation of the binding case 20.
6, 46 reference coordinate axes Measurement coordinate axes (X _S , Y _S , Z _S )
This is done by detecting the rotation angle θ _S above with a magnetic sensor for torsion measurement.

The detected values are converted into electric signals, and the detected value information is input to the personal computer 56. PC 56 data processing detected value information inputted, obtains the rotational angle gamma _O of the reference coordinate axes _{(X O, Y O, Z} O) inclination angle theta _O and unity casing 20 of the central drilling axis 14 on , Display on the monitor. Then, the printer 58 appropriately prints out.

As a result, the excavation shaft 12, 1 in the ground
The state of 4 and 16 can be grasped, and if the underground continuous wall is twisted or inclined, it is corrected, and if not, the excavation work is resumed as it is. Hereinafter, by performing accuracy measurement for each predetermined depth by the same procedure, it is possible to construct a reliable underground continuous wall without twisting and inclination. Therefore, even when a mountain retaining wall, a water blocking wall, or the like is formed, there is no possibility that a mechanically fragile portion is formed or the water stopping effect is incomplete.

As described above, according to the method for measuring the accuracy of the multi-axis excavating shaft of the first embodiment, it is possible to quickly obtain a highly accurate measured value. In addition, a twist angle, which could not be obtained without measuring two axes at both ends of the excavation axis, can be obtained by measuring one axis. As a result, the measurement operation time can be reduced, and a more accurate measurement value can be obtained.

Further, conventionally, since the measurement is carried out by utilizing the two shafts at both ends of the excavation shaft, which is a cement milk supply passage, it is difficult to smoothly slide the measuring device 42 and cleaning is required after the measurement. On the other hand, in the first embodiment, since the central excavation shaft 14 that is the air supply path can be used, the measuring device 42 can be smoothly moved up and down, and it is not necessary to perform cleaning after the measurement. .

In the first embodiment, the twist angle
A magnetic sensor was used to detect
Not to be measured, but to be measured fixed to the binding case 20
Anything that can detect the rotation angle of the body may be used. For example,
Sound wave, optical sensor, isotope sensor, etc. will replace this
Fried as a thing. In addition, the measurement is performed on the central excavation axis 1
4 was used, but the reference coordinate axis (X_O, Y _O,
Z_O) Angle of inclination of excavation axis θ_OAnd binding case
20 rotation angle γ_OIf you can measure
The drilling shaft 12 or 16 may be used. In addition, on the even axis
It is possible to measure even by measuring one axis
You.

FIG. 9 is a configuration diagram of a second embodiment of a multi-axis excavation shaft to which the accuracy measuring method for a multi-axis excavation shaft according to the present invention is applied. In the first embodiment, at the time of measurement, the joints of the excavation shafts 12, 14, 16 were removed from the multi-axis excavator for measurement, but in the second embodiment, the excavation shafts 12, 14, 16 were measured. , 16 is measured from the multi-axis excavator 60 without removing the joint. Therefore, it is configured as follows. The same members and the same devices as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The upper ends of the respective excavating shafts 12, 14, 16 are connected to a multi-spindle excavator 60. Multi-axis excavator 6
0 means that each of the excavation shafts 12, 14,
16 is rotated, air is supplied to the central excavation shaft 14 by the supply means (not shown), and the excavation shafts 12 and 1 at both ends are provided.
Liquid such as cement milk is supplied to 6. The multi-axis excavator 60 includes a guide rail 66 arranged on a reader 64.
Slidably supported on a slider 68,
It is suspended by a wire 70. The lower end of the reader 64 is supported by the base machine 72. Also,
A guide 74 is provided at the lower end of the leader 64, and the kneading blades of the excavating shafts 12, 14, 16 are guided by the guide 74 so as to proceed in parallel with the leader 64, and shaft runout is prevented. To be done.

By the way, the central excavating shaft 14 into which the measuring instrument 42 is inserted is connected to a rotary shaft 76 provided inside the multi-spindle excavating shaft machine 60. The rotary shaft 76 is rotatably supported by the multi-axis excavator 60, and the motor 62
The excavating shaft 14 is rotationally driven together with the excavating shafts 12 and 16 by obtaining more rotational force. The inside of the rotary shaft 76 is formed in a rectangular shape like the inside of the excavation shaft 14, and
6 communicates with an air supply port 78 formed in the support portion.

A casing 80 is formed above the support portion of the rotary shaft 76 coaxially with the rotary shaft 76. In the casing 80, the measuring device 42 waiting for measurement is housed. A cable 48 is connected to the measuring device 42 as in the first embodiment. The cable 48 is a guide roller 8 installed on the multi-axis excavator 60.
The base machine 7 while being guided by 2, 82, ...
It is wound up on the cable reel 50 installed in No. 2. In addition, the measuring device 42 formed in the casing 80
The seal member 84 prevents the air from leaking at the contact portion with.

The value detected by the measuring device 42 is measured in the same manner as in the first embodiment. The method for measuring the accuracy of the multi-axis excavation shaft configured as described above is as follows. First, after excavating the ground to a predetermined depth with the multiaxial excavation shaft 10, the temporary excavation work is interrupted. The meter 42 is then inserted into the drilling shaft 14, which is done as follows. That is,
The measuring instrument 42 is housed in the casing 80 during excavation and is inserted into the excavating shaft 14 only during measurement. Since the casing 80 is provided coaxially with the excavation shaft 14,
When the cable 48 is unwound from the cable reel 50, it descends due to its own weight and is inserted into the excavation shaft 14.

In the following, the measuring instrument 42 is inserted to the position of the binding case 20 and the inclination angle of the excavation shaft 14 and the twisting angle of the binding case 20 are measured in the same procedure as in the first embodiment. After the measurement is completed, the cable 48 is wound on the cable reel 50 again, and the measuring device 42 is moved up and stored in the casing 80. Then, the excavation is started again.

As described above, in the second embodiment, since the work of removing the excavation shaft 14 from the multi-spindle excavator 60 is not required for the measurement, the measurement work can be performed extremely quickly. As a result, it is possible to prevent inconveniences such as cement milk solidifying during work interruption, and it is possible to construct a highly accurate underground continuous wall in a short time.

[0040]

As described above, according to the present invention,
Since the accuracy of the multi-axis excavator is measured using only one of the multi-axis excavation axes, it is possible to quickly obtain a highly accurate measurement value. Further, according to the second embodiment, at the time of measurement, the joints of the multi-axis excavating shafts 12, 14, 16 are connected to each other by the multi-axis excavator 6
Since the work of removing from 0 is not required, the measurement work can be performed extremely quickly.

As a result, it is possible to prevent the inconvenience that the cement milk and the like solidify during the interruption of the work, and it is possible to construct a highly accurate underground continuous wall in a short time.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment of a multi-axis drilling shaft to which a method for measuring the accuracy of a multi-axis drilling shaft according to the present invention is applied.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 (a state without twist)

FIG. 3 is an enlarged view of a main part of FIG.

[4] A-A cross-sectional view of FIG. 1 (twisted clockwise theta _O
State that occurred)

FIG. 5 is an enlarged view of a main part of FIG. 4;

FIG. 6 is an explanatory view illustrating a measuring method of the accuracy measuring method for a multi-axis excavating shaft according to the present invention.

FIG. 7 is an explanatory view for explaining a measuring method of the accuracy measuring method for a multi-axis excavating shaft according to the present invention.

FIG. 8 is an explanatory diagram illustrating a measuring method of the accuracy measuring method for a multi-axis excavating shaft according to the present invention.

FIG. 9 is a side view of the first embodiment of a multi-axis excavator to which the accuracy measuring method for a multi-axis excavation axis according to the present invention is applied.

[Explanation of symbols]

 10 ... Multi-axis drilling shaft 12, 14, 16 ... Drilling shaft 20 ... Binding case 42 ... Measuring instrument 46 ... Permanent magnet 48 ... Cable 50 ... Cable reel 56 ... PC 60 ... Multi-axis drilling machine 80 ... Casing

Claims (2)

[Claims] 1. A method for measuring the accuracy of a multi-axis excavation axis, which comprises measuring a tilt and a twist of a multi-axis excavation axis in which a plurality of excavation axes are bound together by a binding member so as to be rotatable and arranged in parallel. One axis is used as a measurement axis, and a sensor member for detecting a twist amount with respect to a reference position of the measurement axis is provided, and a binding case that binds the multi-axis excavation axis is inserted into the measurement axis. A measuring instrument capable of measuring the amount of inclination of the measuring shaft and the amount of twist of the binding case,
An accuracy measuring method for a multi-axis excavating shaft, comprising: inserting the measuring device to a measurement position of the binding case, and measuring an inclination amount of the measurement shaft and a twist amount of the binding case. 2. The measuring device is mounted on a multi-axis excavator driving a multi-axis excavating shaft via a cable reel during excavation, and lowers the inside of the excavation pipe to the binding case during measurement. The method for measuring the accuracy of a multi-axis drilling shaft according to claim 1.