JP3465006B2 - Vertical hole wall condition measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the wall surface state (excavation diameter, hole bending, etc.) of a vertical hole after excavation by an earth drill using ultrasonic waves.

[0002]

2. Description of the Related Art Vertical holes excavated by buckets or bits of cast-in-place pile construction machines such as earth drills and reverse machines are
It is required to measure the wall surface condition of the hole with an ultrasonic measuring device and record it. The ultrasonic measuring device lowers the ultrasonic transmitter / receiver in muddy water, emits ultrasonic waves from the transmitter toward the wall surface of the hole, receives the reflected wave from the wall surface with the receiver, and measures the time from transmission to reception. By measuring the distance to the wall surface, the diameter of the hole is obtained.

As a known device for measuring the state of such a vertical hole by ultrasonic waves after excavation, Japanese Patent Laid-Open No. 25281/1990 has been proposed.
As disclosed in Japanese Patent Laid-Open No. 3-281891, or Japanese Patent Laid-Open No. 3-281891, after excavation, the machine is retracted from the excavation hole and a dedicated ultrasonic measuring device is installed.

[0004]

However, in such a known ultrasonic measuring apparatus, the setup for moving the excavator from the excavation hole and installing the ultrasonic measuring apparatus at the center of the excavation hole. There was a problem that it took time.

In view of the above problems, it is an object of the present invention to provide an apparatus for measuring the wall surface state of a vertical hole excavated by an earth drill, which can reduce the setup time and labor for the measurement. .

[0006]

In order to achieve the above object, the vertical hole wall surface condition measuring apparatus of the present invention measures the excavation depth.
An apparatus for measuring the state of the wall of the vertical hole excavated by the earth drill having a depth meter constant for, under the Keriba
A base with a tubular part that is detachably attached to the end by a pin
Adjustable distance between the body and the wall of the vertical hole on the base
It is provided, and the distance data is obtained by facing the wall of the vertical hole.
An ultrasonic measuring device comprising an ultrasonic wave transmitter / receiver;
Said transmitted via a cable provided along the
From the distance data from the ultrasonic measurement device and the depth gauge
Calculates the diameter of a vertical hole at a specified depth from the depth data
And a vertical hole calculated by the arithmetic device
This consisting an output device for outputting the diameter at a predetermined depth
And are characterized. In addition, the vertical wall surface condition measuring device of the present invention
A ground drill equipped with a depth gauge to measure the depth of excavation.
For measuring the condition of the wall surface of a vertical hole excavated by
And is attached to the lower end of the kelly bar with a pin so that it can be detached.
A base body having a cylindrical portion and a wall surface of a vertical hole in the base body.
The distance is adjustable and the kelly bar must not be rotated.
An ultrasonic transmitter / receiver that obtains distance data from the wall of a vertical hole
And an ultrasonic measuring device comprising a support for supporting the kelly bar.
Rotational position detection of the kelly bar provided on the non-rotating part of the ram
Via the output device and the cable installed along the kelly bar
Distance data from the ultrasonic measuring device
And the predetermined depth of the vertical hole according to the depth data from the depth meter
An arithmetic unit for calculating a diameter of, to the arithmetic unit
Outputs the calculated diameter of the vertical hole at the specified depth.
And a force device, and the arithmetic device is used to rotate the kelly bar.
The signal obtained by the transposition detector is used as the rotation reference point,
The distance data from the ultrasonic measuring device is extracted and
Equipped with calculation means for calculating the diameter of the vertical hole in the direction orthogonal to
Characterized in that was. In addition, the wall surface state measurement of the vertical hole of the present invention
The measuring device is the device obtained by the measurement of the ultrasonic measuring device.
Kerry bar equipped with an earth drill as a data transfer route
A reel mounted on a drive and rotating with the kelly bar
The wireless transmitter mounted on the table and the body of the ground drill
A wireless transfer route consisting of a wireless receiver mounted on
It is characterized by being used . In addition, the vertical wall surface of the present invention
The state measurement device is the same as the ultrasonic measurement device except that
In that a position adjusting device for changing the distance between the wall and
Characterize.

[0007]

In the present invention, after the vertical hole is drilled by the earth drill, the ultrasonic measuring device is attached to the tip of the kelly bar, and the ultrasonic measuring device is inserted into the vertical hole together with the kelly bar to measure the wall surface condition. In this case, in order to insert the kelly bar again into the vertical hole drilled by the earth drill itself,
The kelly bar is inevitably inserted in the center of the vertical hole, and the centering work becomes unnecessary.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a side view showing an embodiment of an earth drill of the present invention in a state where a hole is being measured, FIG. 1B is a partially enlarged view thereof, and FIG. FIG. 4A is an enlarged view of an arrow E of FIG. 3A, and FIG.
Is a side view showing the tip of the kelly bar, (B) is a bottom view of (A), and (C) is a change view of (B).

As shown in FIG. 1 (A), in the earth drill of this example, a main body 1 is constructed by installing an upper revolving structure 1c on a lower traveling structure 1a via a revolving device 1b, and an upper revolving structure 1c. The front frame 2 and the boom 3 are attached to the upper and lower parts of the front frame 2 so that
The kerry bar drive unit 4 is mounted on the. Kerry bar drive 4
In this case, the kelly bar 5 is inserted into a rotary drive plate (not shown) rotated by the motor so as to be relatively non-rotatable and vertically movable. The kerry bar 5 is wound and fed by a hoisting winch 6 mounted on the upper swing body 1c, and is hung around the sheave 7 on the top of the boom 3 and hung down on the kelly rope 8 which has a swivel joint. Since the telescopic Kelly bar 5 is extended and the swivel joint is accommodated inside, it is connected via (not shown).

The earth drill of this example shows a bottom expanding earth drill in which a bottom expanding bucket (not shown) forming an enlarged portion at the bottom of a vertical hole is attached to the lower end of the kelly bar 5.
In this bottom expanding earth drill, a hydraulic cylinder is used to open and close the expanding blades of the bottom expanding bucket, and as shown in FIGS. 2 and 3, a hydraulic hose for supplying hydraulic oil to the hydraulic cylinder is wound. A reel table 13 equipped with a hose reel 10 and a cable reel 12 around which a cable 11 for electrically connecting to a potentiometer for detecting the degree of opening of an enlarged wing is mounted is mounted via a center joint 14 having a hydraulic rotary joint. The upper frame 2
It is attached to the lower surface of a and the reel table 13 rotates together with the kelly bar 5. The center joint 14 of this example is an axial digging bucket (a bucket that does not have a bottom expanding function).
When excavating a vertical hole by use or when performing axial excavation with the bottom expanding bucket closed, the reel table 1
No. 3 is provided with a clutch so that it can be stopped, but detailed description thereof will be omitted. In addition, the center joint 14 is provided with a rotary contactor including a brush and a ring for transmitting electric signals and electric power by wire.
A power source or the like mounted on the upper swing body 1c may be connected to the cable 11, but in the present embodiment, a battery (not shown) is mounted on the reel table 13 and an FM transmitter on the reel table 13 is mounted. FM above 15 revolving structure 1c
Data of the potentiometer is carried to the receiver 16 (see FIG. 1B and FIG. 6).

As shown in FIGS. 1 (A), 4 (A), and 4 (B), a vertical hole 17 formed by an earth drill (in this example, a vertical hole 17 having an expanded bottom portion 17a is shown, and the stabilizer 1 is contained in the vertical hole 17).
In order to measure the wall surface state (filled with 8), in the present invention, an ultrasonic measuring device 20 is detachably attached to the lower end of the kelly bar 5 by a pin 19 instead of the bucket for excavation. The ultrasonic measurement device 20 has a disk-shaped base 21 having a cylindrical portion 21a on its upper surface for pinning the kelly bar 5, and a lower surface of the base 21 such that its position can be adjusted in the radial direction of the base 21. The mounting plate 22 to be mounted (that is, the mounting plate 22 has a plurality of bolt insertion holes 22).
a is provided, and the bolt 23 is inserted into an arbitrary hole 22a selected from among the holes a and screwed into the screw hole of the base body 21 so that the mounting plate 22 is mounted on the lower surface of the base body 21). The ultrasonic wave transmitter / receiver 24 is attached to the tip of the plate 22. As shown in FIG. 1A, in order to prevent the cable 11 from slipping due to the rotation of the kelly bar 5, a guide 25 that prevents the cable 11 from swaying is attached to the kelly bar 5.

FIG. 5A shows a rotational position detector 27 for detecting a rotation reference point of the kerry bar 5 when the wall state of the vertical hole 17 is detected while the kerry bar 5 is rotated. FIG. 2B is an enlarged cross-sectional view of a G portion, and FIG. 1B is a view as viewed from an arrow H in FIG. 1A. The rotation position detector 27 of the present example is a proximity switch, and the upper frame of the front frame 2 that is a support portion of the kerry bar 5. It is mounted on the lower surface of 2a and performs a switching operation in response to a magnetic material 28 such as an iron plate mounted on the rotating portion 14a of the center joint 14.

FIG. 6 is a system diagram showing the configuration of this measuring system. Reference numeral 30 is an encoder for detecting the rotational speed of the sheave 7 on the top of the boom 3, and 31 is the excavation depth from the output signal of the encoder 30. It is a depth gauge and is equipped with an earth drill. In this embodiment, the depth gauge 31 is used for measuring the wall surface condition. Reference numeral 32 designates the output signals of the depth meter 31, the rotational position detector 27 of the kelly bar 5 and the FM receiver 16 for arithmetic processing, and a printer,
It is an arithmetic unit (computer) for outputting to an output unit 33 such as an XY plotter or a display unit, and the arithmetic unit 32 is provided with a memory unit for storing record data. The depth gauge 31, the arithmetic unit 32 and the output unit 33 are shown in FIG.
As shown in (B), it is installed in the cab 34 of the main body 1.

Next, the measuring operation of the vertical hole 17 after excavating the vertical hole 17 with an earth drill will be described. Figure 1
As shown in (A) and FIGS. 4 (A) and 4 (B), when the excavation work is completed, the ultrasonic measuring device 20 is attached to the tip of the lifted kerry bar 5 instead of the bucket, and the cable 11 is attached. It is connected to the ultrasonic measuring device 20 through a steady rest guide 25 attached to the kelly bar 5. Then, the mounting position of the mounting plate 22 to which the transceiver 24 is fixed is adjusted according to the diameter of the drilled hole. For example, in the case where the vertical hole 17 to be measured is small, FIGS.
As shown in FIG. 2, the mounting plate 2 is arranged so that the transmitter / receiver 24 does not protrude from the base 21 or the protruding width is small.
Fix 2

Further, as shown in FIGS. 4D and 4E, the ultrasonic measuring device 20 has a dead zone s and the vertical hole 17
When the diameter of the ultrasonic wave is smaller, it may interfere with the dead zone to make measurement impossible. In that case, the dead zone s is taken into consideration, and the transmission / reception surface 24a is turned to face the center of the ultrasonic measurement device 20. It can be mounted so that the mounting position can be changed.

On the other hand, when the diameter of the vertical hole 17 is large, or when the concentration of the stabilizing solution 18 is high, as shown in FIG. The mounting plate 22 is fixed so that the transceiver 24 is close to it. Correction of data by such position adjustment can be performed by inputting a set value by a keyboard operation or the like on the arithmetic unit 32 side.

In the earth drill, the work of inserting the bucket into the vertical hole 17, excavating and pulling up, turning and discharging the earth is repeated, and the position of the kerry bar 5 is set by the turning lock device for positioning the bucket. Vertical hole 17
Since the position of the kerry bar 5 is returned to the excavation position, the position for the measurement is automatically adjusted, and the setup time for adjusting the ultrasonic measuring device 20 to the center of the vertical hole 17 is automatically adjusted. do not need.

In this way, the kerry bar 5 is positioned on the vertical hole 17, and the winch 6 is operated to feed the kelly rope 8 out of the drum to lower the kerry bar 5 into the vertical hole 17. Then, when the ultrasonic measuring device 20 descends to a predetermined depth, the descent of the kelly bar 5 is temporarily stopped, the hydraulic motor of the kelly bar driving device 4 is driven to rotate the kerry bar 5, and ultrasonic waves are transmitted from the transceiver 24. It transmits to the wall surface, receives the reflected wave, and sends the data of the time difference as a current signal to the FM transmitter 15 via the cable 11.
In the FM transmitter 15, the converter 15a converts the current signal into a voltage signal, further converts it into an FM wave, sends it to the FM receiver 16, and inputs the data to the arithmetic unit 32. At the same time, the depth data of the ultrasonic measuring device 20 from the depth gauge 31 and the signal from the rotational position detector 27 of the kelly bar 5 are input to the arithmetic unit 32. From these input data, vertical holes 17
The diameters in the X and Y directions at a predetermined depth are calculated as described below, and the calculation results are printed and displayed by the output device 33 and stored in the memory device.

In the measurement by the ultrasonic measuring device, the position of the transmitter / receiver 24 is adjusted, so that the ultrasonic measuring device is connected by a cable as disclosed in JP-A-3-281891. It is possible to prevent the situation in which ultrasonic waves are diffusely reflected and ultrasonic waves cannot be received due to the thick mud water (stabilizing liquid 18) and the large amount of suspended matter, as in the case of measuring by hanging down in muddy water. There is no need to replace with or to replace the stabilizing solution. In addition, when the diameter is large like the expanded bottom portion 17a or the diameter of the vertical hole 17 is large, there is a distance between the transmitter / receiver 24 and the wall surface of the vertical hole 17 even if there are few suspended matters. However, when the diameter of the vertical hole 17 is large as in the present embodiment, the transceiver 24 can be projected and brought closer to the wall surface to enable reception.

Further, as described in Japanese Patent Laid-Open No. 2552813/1990, in the case of spraying water around the ultrasonic path to eliminate obstacles of ultrasonic waves in the ultrasonic path of the ultrasonic transceiver 24. Although the wall surface 17b of the vertical hole 17 is roughened, in this embodiment, since the distance between the transmitter and the receiver 24 is adjusted, there is no fear of roughening the wall surface 17b.

Further, as in this embodiment, the FM transceiver 1
By using 5 and 16, it is not necessary to route the cable around the front frame 2 and it is not necessary to add a rotary contactor to the center joint 14 as compared with the case of wired connection. In addition, the cables 11, the FM transceivers 15 and 16, the depth gauge 31 and the arithmetic unit 32 are also used as those originally provided in the bottomed grounding drill, so that the number of newly added devices can be reduced.

Further, as an embodiment of the present invention, there is also an embodiment in which four transceivers 24 are radially arranged outward and the kerry bar 5 is made non-rotating and measurement is performed in two directions orthogonal to each other. As described above, the number of transmitters / receivers 24 and a plurality of transmitters / receivers 24 are measured by performing measurements by the transmitter / receiver 24 when rotating the kelly bar 5 while rotating a predetermined angle from the signal of the rotational position detector 27 and the rotational speed.
Has the advantage of not requiring an expensive multiplexer to select the output of the. In addition, the above-mentioned JP-A-3-281
The ultrasonic measuring device disclosed in Japanese Patent No. 891 is suspended by a cable. After the ultrasonic measuring device is lowered to the bottom of the vertical hole and measured in the X direction, the ultrasonic measuring device is temporarily pulled up to The direction is changed by 90 degrees, and the ultrasonic measuring device is lowered into the vertical hole again to measure in the Y direction. However, as in the present embodiment, the rotation reference point is obtained and the ultrasonic measuring device is rotated at once. By measuring in the X and Y directions, the measurement can be performed efficiently. Also,
In the present invention, the measurement in the X and Y directions is performed in the X direction when the ultrasonic measuring device 20 is lowered,
You may make it measure in the Y direction when pulling up.

Next, regarding a specific calculation processing example in the measurement, a side view for explaining the method of calculating the vertical hole radius in FIG. 7A, a plan view for explaining the measurement points in FIG. 7B, and a flow chart in FIG. It will be explained by. Transmission / reception of, for example, 18 times / second is performed from the ultrasonic measurement device 20 to the wall surface 17b of the vertical hole 17 (step S1 in FIG. 8). First, it is determined whether or not there is data near the planned diameter in the returned data (step S2), and if there is no data, the gain (sensitivity) of the transceiver 24 is increased. When there is data in the vicinity of the planned diameter (step S4), the maximum value (data corresponding to the farthest distance) for each transmission / reception is captured as data obtained by reflection on the wall surface.

Then, for example, the rotation speed of the kelly bar 5 is set to 3r.
If it is pm, it takes 60 seconds / 3 rpm × 18 times / second = 360 times / 1 rotation until one rotation is made after inputting the position data from the rotational position detector 27 and the next rotation data is input (step S6). Data (maximum value of each time) is taken into the arithmetic unit 32 (step S5). Next, the data shown in FIG. 7B, that is, the reference point X1 when the rotation detecting device 27 of the kelly bar 5 faces the magnetic substance 28, the measurement point X2 on the opposite side, and the measurement points Y1 and Y2 that are perpendicular to these points. , That is, vertical hole 17 is 4
The divided distance data is extracted (step S7). That is, the first time (reference point = X1), the 90th time (measurement point = Y
1) The 180th (measurement point = X2) and 270th (measurement point = Y2) transmission / reception data are extracted. Here, FIG.
In (A), the distance from the center of rotation of the ultrasonic measuring device 20 to the transmitting / receiving surface of the transmitter / receiver 24 is r, the dead zone is s, the distance from the dead zone to the vertical hole wall surface 17b is L, and each measurement point X.
Letting the data corresponding to the radii at 1, Y1, X2, and Y2 be X1, Y1, X2, and Y2 (= R), respectively, R = r + s + L can be expressed. The excavation diameters X and Y in the X and Y directions are calculated by X = X1 + X2 and Y = Y1 + Y2 (step S8), and when the data of the depth meter 31 is input (step S9), the output device 33 causes the data shown in FIG.
It is displayed and printed as shown in (C) (step S1).
0). Reference numeral 38 in FIG. 7C is a recording sheet.
The data 39 described in the right column of is the depth of the ultrasonic measurement device 20, the line 35 is the planned line, and 36 and 37 are X line, respectively.
It is a measurement line showing the state of both ends of the wall surface in the Y direction.
Of course, when the depth data is not input, the wall surface condition is displayed as a continuous line by a plotter.

As described above, the method for lowering the kerry bar 5 is to stop the descent of the kerry bar 5 and rotate the vertical hole 17 while rotating.
It is possible to adopt not only a method of repeating the operation of measuring the diameter of No. 1 and then lowering the kelly bar 5 again to stop the descent and performing the measurement, but also a method of performing the measurement while the kerry bar 5 is descended.

FIG. 9A is a side view showing another mounting example of the ultrasonic measuring device according to the present invention, FIG. 9B is a bottom view thereof, and FIG. 9C is a change diagram of FIG. 9B. In the example, two guide rails 4 parallel to the lower surface of the base body 21 are provided.
0, the mounting plate 22 is movably mounted along the guide rail 40, the ultrasonic transmitter / receiver 24 is mounted on the mounting plate 22, and the position of the transmitter / receiver 24 is set between the transmitter / receiver 24 and the base 21. A hydraulic cylinder 41 for adjustment is attached, and the hose reel 1 shown in FIGS.
The hose 42 wound up from 0, that is, the hose connected to the hydraulic cylinder for opening and closing the expansion blade of the bucket is connected. Thus, if the position of the transceiver 24 can be adjusted by the actuator,
With the ultrasonic measuring device inserted in the vertical hole 17, the distance between the transmitter / receiver 24 and the wall surface can be remotely adjusted by an operation from the ground. As shown in FIG. By extending
Accurate measurement that is not affected by suspended matter can be performed.
Further, since the hydraulic hose 42 used is originally included in the expanded bottom earth drill, it is not necessary to newly provide it. In order to accurately set the moving distance of the transmitter / receiver 24, a stopper that mechanically restricts the moving limit of the hydraulic cylinder 41 is provided on the base body 21, but is not shown.

In the above embodiment, the arithmetic unit 32 and the display unit 33 installed on the ground are installed in the operator's cab 34, but they may be installed on the ground in a stationary manner.

[0028]

According to the first aspect of the present invention, the state of the wall surface is measured by attaching the ultrasonic measuring device to the kelly bar and inserting it into the vertical hole. The kelly bar is again inserted into the vertical hole drilled by the earth drill itself. Since the kelly bar is inevitably inserted in the center of the vertical hole because it is inserted, centering work is not required, so the setup time and labor for measurement can be reduced,
The measurement work can be done efficiently.

Further , since the ultrasonic measuring device can adjust the distance between the ultrasonic transmitter / receiver and the wall surface , the ultrasonic measuring device can be adjusted according to the concentration of the stabilizing solution, the state of suspended matter, or the size of the vertical holes. By adjusting the position, it is possible to reduce the influence of diffuse reflection even when the stabilizing solution or suspended matter is thick or when the vertical hole has a large diameter, and it is possible to perform stable measurement without exchanging the stabilizing solution.

According to the second aspect , in the support portion of the kelly bar,
A rotation position detector of the kelly bar is provided, and a vertical hole in the X and Y directions orthogonal to each other is provided in the arithmetic device by the rotation reference point obtained from the rotation position detector of the kelly bar and the measurement data from the ultrasonic measurement device. Since the calculation means for calculating the diameter is provided, it is not necessary to raise the kelly bar once to change the direction of the kelly bar after the measurement in the X direction, and the measurement can be performed efficiently.

According to a third aspect of the present invention, a wireless transmitter mounted on a reel table which is attached to a kerry bar driving device provided on an earth drill and rotates together with the kerry bar as a transportation route of data obtained by measurement by the ultrasonic measuring device. Since a wireless transfer path consisting of a wireless receiver mounted on the body of the earth drill is used, it is not necessary to route the cable around the front frame, and a rotary contactor that electrically connects to the center joint is used. There is no need to provide it.

[Brief description of drawings]

FIG. 1A is a side view showing an embodiment of an earth drill of the present invention in a state where a hole is being measured, and FIG. 1B is a partially enlarged view thereof.

FIG. 2 is an enlarged view of an arrow E of a partial cross section of FIG.

FIG. 3 is a view on arrow F of FIG.

4A is a side view showing the tip of the kelly bar of this embodiment, FIG. 4B is a bottom view of FIG. 4A, FIG. 4C is a change view of FIG. 4B, and FIG. FIG. 6 is a side view showing another example of mounting the transceiver of FIG.

5A is a sectional view taken along line GG of FIG. 2, and FIG.
FIG.

FIG. 6 is a configuration diagram of a measuring device according to the present embodiment.

7A is a side view illustrating a method of calculating measurement data, FIG. 7B is a plan view illustrating a measurement location, and FIG. 7C is a diagram illustrating an example of an output mode.

FIG. 8 is a flowchart illustrating a procedure of measurement work in the present embodiment.

9A is a side view showing another example of attachment of a transmitter / receiver of an ultrasonic measurement apparatus, FIG. 9B is a bottom view thereof, and FIG. 9C is a change diagram of FIG. 9B.

[Explanation of symbols]

1: body, 2: front frame, 3: boom, 4: kerry bar drive device, 5: kerry bar, 6: winch, 8: kelly rope, 10: hose reel, 11: cable, 1
2: Cable reel, 13: Reel table, 14: Center joint, 15: FM transmitter, 16: FM receiver, 17: Vertical hole, 17a: Bottom part, 18: Stabilizer, 2
0: Ultrasonic measuring device, 21: Base, 22: Mounting plate, 2
3: Volt, 24: Transceiver, 27: Kelly bar rotational position detector, 28: Magnetic material, 30: Encoder, 31: Depth meter, 32: Arithmetic device, 33: Output device, 34: Driver's cab, 35: Planning Line, 36, 37: measurement line, 38: recording paper, 39: depth data, 40: guide rail, 41: hydraulic cylinder, 42: hydraulic hose

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Ajiro 650, Kazunachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura factory (56) References -156882 (JP, A) JP-A-58-207486 (JP, A) JP-A-63-255489 (JP, A) Actual Kaihei 5-7785 (JP, U) (58) Fields investigated (Int.Cl) . ⁷ , DB name) E21B 47/00 E21B 47/01

Claims (4)

(57) [Claims] 1.Equipped with a depth gauge to measure the excavation depthGround
A device for measuring the condition of the wall surface of a vertical hole drilled by a drill.
In theA cylindrical part that is detachably attached to the lower end of the kelly bar with a pin.
And the distance between the base and the wall surface of the vertical hole
It is adjustable so that it can face the wall of the vertical hole
An ultrasonic measuring device comprising an ultrasonic transmitter / receiver for obtaining the Transmission via cable provided along the kelly bar
The distance data from the ultrasonic measuring device and
Based on the depth data from the depth gauge,
A computing device for computing the diameter, At the predetermined depth of the vertical hole calculated by the arithmetic device
It consists of an output device that outputs the diameter Vertical characterized by
Hole wall condition measuring device. 2.Earth with a depth gauge to measure the drilling depth
A device for measuring the condition of the wall surface of a vertical hole drilled by a drill.
In the A cylindrical part that is detachably attached to the lower end of the kelly bar with a pin.
And the distance between the base and the wall surface of the vertical hole
It is adjustable and can be rotated vertically while rotating the kelly bar.
It consists of an ultrasonic transmitter / receiver that obtains distance data from the wall surface of the hole.
Ultrasonic measuring device, Provided on the non-rotating part of the frame that supports the kelly bar
Keliva rotation position detector, Transmission via cable provided along the kelly bar
The distance data from the ultrasonic measuring device and
Based on the depth data from the depth gauge,
A computing device for computing the diameter, At the predetermined depth of the vertical hole calculated by the arithmetic device
It consists of an output device that outputs the diameter, In the arithmetic device, by the rotation position detector of the kelly bar
Rotate desired signal The ultrasonic measurement device as a reference point
Distance data from the
Equipped with calculation means to calculate the diameter of the hole Characterized by
Vertical hole wall condition measuring device. 3. An apparatus according to claim 1 or 2, wherein the transport path of the data obtained by measuring the ultrasonic measurement device,
It features a wireless transport path consisting of a wireless transmitter mounted on a reel table that rotates with the kerry bar that is attached to the kerry bar driving device equipped with the ground drill, and a wireless receiver mounted on the body of the ground drill. Measuring device for wall condition of vertical hole. 4. The method according to any one of claims 1 to 3, The above The distance between the ultrasonic transmitter and receiver and the wall surface
Vertical hole characterized by having a position adjusting device for changing
Wall condition measuring device.