JPH06273148A - Drilled hole shape measuring method - Google Patents

Abstract

PURPOSE:To provide a drilled hole shape measuring method capable of accurately measuring the drilled hole which is formed on the ground for construction of driving a cast-in-place pile. CONSTITUTION:A sensor unit 27 comprising an ultrasonic sensor horizontally supported therein is suspended by a wire 17 and let down from the ground level 9 to a bottom section 37 in a drilled hole 5. At that time, the ultrasonic sensor is turned in the horizontal face by a motor in the sensor unit 27 and distances from the sensor to plural points of a hole wall 35 in the horizontal direction are measured by means of an ultrasonic wave emitted from the ultrasonic sensor so that three dimensional shape of the hole 5 is analyzed and surveyed on the basis of the plural measured results.

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 shape of a hole formed in the ground for cast-in-place pile construction or the like.

[0002]

2. Description of the Related Art Generally, in cast-in-place pile construction, a boring hole is formed in the ground and a stabilizing solution such as bentonite solution is poured to stabilize the boring wall of the boring hole. It is driven to form piles. Then, conventionally, in order to calculate the amount of concrete to be placed on the hole wall of the drilling hole, the horizontal cross-sectional shape is measured at any location of the drilling hole, and the drilling depth of the drilling hole is determined from the measurement result and the depth of the drilling hole. The overall shape and area of the hole wall were estimated.

Further, since the amount of concrete poured depends on the amount of sludge (hereinafter referred to as slime) which is generated during excavation of a drilling hole and floats in the stabilizing liquid, conventionally, the drilling amount is reduced as necessary. The stable liquid near the bottom of the hole was sampled by a submersible pump, etc., and the amount of slime in the whole hole was estimated from the amount of slime in the stable liquid.

[0004]

However, as described above, conventionally, the amount of concrete to be placed is calculated based on the estimated overall shape of the drilled hole, the hole wall area thereof, and the slime amount of the whole drilled hole. Therefore, taking into account the error between those estimated values and actual values, it is necessary to set the concrete pouring amount to be larger than the calculated value, consuming more concrete than necessary and reducing construction costs. It was a factor to increase. Therefore, it is desirable to be able to accurately measure the shape of the drilled hole formed in the ground in order to calculate the amount of concrete placed in the cast-in-place pile work more accurately. The present invention has been made in view of the above circumstances, and an object thereof is to provide a method capable of accurately measuring the shape of a drilled hole formed in the ground for cast-in-place construction or the like.

[0005]

In order to achieve the above object, the present invention according to claim 1 is a method for measuring the shape of a drill hole formed in the ground, wherein an ultrasonic sensor is provided in the drill hole. The ultrasonic wave is output by the ultrasonic sensor, and the reflected wave of the ultrasonic wave from the hole wall of the drilled hole is received by the ultrasonic sensor. The horizontal distance from the irradiated hole wall portion to the ultrasonic sensor is measured, and the horizontal distance is measured by moving the ultrasonic sensor in a horizontal plane and moving up and down from the ground to the bottom of the drilled hole. By continuously performing the three-dimensional position coordinates of the plurality of positions of the hole wall based on the ascending / descending position of the ultrasonic sensor and the directing direction in the horizontal plane, and the measurement result of the distance in the position and direction. Indexing, of the indexed hole wall Characterized by being adapted to measure the boring shape based on the three-dimensional position coordinates of several points.

Further, in the present invention according to claim 2, the drilled hole is formed for cast-in-place pile construction, and a stabilizing solution is filled in the drilled hole. The difference between the amplitude of the ultrasonic wave output by the ultrasonic sensor and the amplitude of the reflected wave from the hole wall received by the ultrasonic sensor is detected, and based on the detection result, in the stable liquid generated during the formation of the hole. The amount of slime was measured together. further,
According to the present invention of claim 3, based on the measured shape of the drilled hole and the amount of slime in the drilled hole, the amount of concrete required for placing a concrete pile on the hole wall is adjusted. I tried to measure it.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing an embodiment of the method of the present invention applied to measuring the shape of a hole drilled in cast-in-place construction. In FIG. 1, reference numeral 1 is a site for cast-in-place pile construction. In the ground 3 of the site 1, a drilling hole 5 has already been formed by an arbitrary drilling method such as an earth drilling method, a benot method and a reverse circulation method, and a stabilizing solution 7 such as bentonite solution is formed in the drilling hole 5. It has been poured.

A base 13 is installed on the ground 9 of the site 1 so as to straddle the opening 11 of the drilled hole 5, and a measuring unit 15 is installed on the base 13. A wire 17 is suspended from the measuring unit 15. As shown in FIG. 2, in the measuring unit 15, a winding means 19 such as an electric winch for winding and unwinding the wire 17, a winding and unwinding amount of the wire 17 is detected, and a signal corresponding to the detected amount is output. Encoder 2
1 and a measuring device 23 are housed, and the measuring device 23 is connected to the microcomputer (hereinafter abbreviated as microcomputer) 25 of FIG. 1 for controlling the drive of the winding means 19.

Further, the wire 1 located inside the drilled hole 5
A sensor unit 27 is attached to the tip of 7. As shown in FIG. 2, the sensor unit 27 includes an ultrasonic sensor 29, a motor 31, and a rotary encoder 33.

The ultrasonic sensor 29 is oriented in the horizontal direction, outputs ultrasonic waves for distance measurement toward the hole wall 35 (FIG. 1) of the drilled hole 5, and receives a reflected wave from the hole wall 35. , Outputs a signal according to the reception state. The motor 31 is controlled by the microcomputer 25 to rotate the ultrasonic sensor 29 in the horizontal plane at a constant speed. The rotary encoder 33 detects the rotation angle of the motor 31 and outputs a signal according to the rotation angle.

The measuring instrument 23 includes an encoder 2 at regular intervals.
1, ultrasonic sensor 29, and rotary encoder 33
Based on these signals that have been taken in, the horizontal distance from the hole wall 35 where the ultrasonic waves are irradiated to the ultrasonic sensor 29 and the stabilizing liquid 7 in the optical path of the ultrasonic waves. Measure slime concentration.

The measurement result of the measuring device 23 is input to the microcomputer 25, and based on the measurement result regarding the distance, the microcomputer 25 determines the three-dimensional coordinates of the 35 hole walls irradiated with the ultrasonic wave from the ultrasonic sensor 29. The shape of the drilled hole 5 is analyzed based on the obtained three-dimensional coordinates of the 35 locations of the hole wall.
Further, the microcomputer 25 calculates the area of the hole wall 35 of the drilling hole 5 based on the analysis result of the shape of the drilling hole 5 and drills the hole based on the measurement result of the measuring device 23 regarding the slime concentration in the stabilizing solution 7. The amount of slime in the whole 5 is calculated, and the amount of concrete to be placed in the hole wall 35 is calculated based on these calculated values.

Next, the operation of measuring the shape of the drilled hole according to the method of the present invention will be described. First, the wire 17 is wound up by the winding means 19 so that the sensor unit 27 is located at the height of the ground 9, and the measurement is started by an instruction from the microcomputer 25.

When the measurement is started, the ultrasonic sensor 29 is swung at a constant speed in the horizontal plane by the driving of the motor 31 under the control of the microcomputer 25, and when the ultrasonic sensor 29 completes one turn, the microcomputer 25 controls. Hoisting means 19
The wire 17 is paid out by a constant amount by the driving. Along with this, the sensor unit 27 descends within the drilled hole 5 from the ground 9 to the bottom portion 37 (FIG. 1) of the drilled hole 5 by a certain height, and when the lowering is completed, the motor 31 is driven by the control of the microcomputer 25 again. The ultrasonic sensor 29 is rotated by one revolution in a horizontal plane at a constant speed. Then, after that, a certain amount of descent of the sensor unit 27 and turning of the ultrasonic sensor 29 for one round are repeated until the sensor unit 27 reaches the bottom portion 37 of the drilled hole 5 and completes one round of rotation in the horizontal plane. Be seen.

The ultrasonic sensor 29 is driven by driving the motor 31.
The ultrasonic sensor 29 constantly outputs ultrasonic waves and receives a reflected wave from the hole wall 35 while being rotated by one turn in the horizontal plane. When the ultrasonic sensor 29 is turned around in the horizontal plane at each descending position, the measuring instrument 23 takes in the output signals of the encoder 21, the ultrasonic sensor 29, and the rotary encoder 33 at regular intervals.

When the above output signals are taken in, the measuring instrument 23
Measures the distance in the horizontal direction to the 35 hole walls by the phase of the reflected wave of the ultrasonic wave from each hole wall 35 of the drilled hole 5 received by the ultrasonic sensor 29. Further, when the ultrasonic sensor 29 outputs an ultrasonic wave having a waveform W as shown in FIG. 3, for example, if there is slime in the stabilizing solution 7 applied to the optical path of the ultrasonic wave or the reflected wave from the hole wall 35, These ultrasonic waves and reflected waves are attenuated and the amplitude is reduced as shown by the waveform W1 in FIG. Therefore, the measuring device 23 measures the slime concentration in the stabilizing solution 7 on the optical path of the ultrasonic wave or the reflected wave from the difference between the amplitude of the ultrasonic wave at the time of output and the amplitude of the received reflected wave. In addition, the measuring instrument 23 has an encoder 21
The output position of the ultrasonic encoder 29 and the pointing direction in the horizontal plane are determined based on the output signal of the rotary encoder 33.

Therefore, in the measuring instrument 23, the plurality of hole walls 3 at the plurality of descending positions from the ground surface 9 to the bottom portion 37 of the drilled hole 5.
The measurement results of the horizontal distance to the ultrasonic sensor 29 and the slime concentration in the stabilizing solution 7 at five points are obtained, and the measuring instrument 23 determines the measurement results by the ultrasonic sensor 29 corresponding to the measurement result. The descent position and the directivity in the horizontal plane are linked and output to the microcomputer 25.

Based on the output of the measuring device 23, the microcomputer 25 obtains the three-dimensional coordinates of each of the 35 hole walls irradiated with the ultrasonic wave from the ultrasonic sensor 29, and determines the 3D coordinates of the obtained 35 hole walls. The shape of the drilled hole 5 is analyzed from the three-dimensional coordinates. In addition, the microcomputer 25 uses the drilling 5 based on the above analysis result.
The area of the hole wall 35 is calculated, and the slime amount in the entire drilling hole 5 is calculated based on the output of the measuring device 23 indicating the slime concentration in the stabilizing solution 7 at each hole wall 35, and these calculations are performed. The amount of concrete to be placed on the hole wall 35 is calculated based on the value.

The analyzed shape of the drilled hole 5 and the calculated concrete pouring amount are displayed on a display (not shown) connected to the microcomputer 25, for example, on a screen as shown in FIG. . On this screen, the analyzed shape of the drilled hole 5 is displayed as a computer graphic image G, and accompanying this, the diameter φ of the opening 11 of the drilled hole 5 and the depth L1,
The maximum amount of strain H at various points on the hole wall 35, the slime concentration S1 in the stabilizing solution 7, the slime sedimentation thickness S at the bottom 37 of the drilling hole 5, the design pile length L, and the concrete pile driven from the opening 11 of the drilling hole 5 The distance L3 to the top of the, the amount C of poured concrete, etc. are displayed at the same time.

As described above, according to the method of measuring the shape of the drilled hole of the present embodiment, the sensor unit 27 accommodating the horizontally supported ultrasonic sensor 29 is suspended by the wire 17 and the ground 9 is cut in the drilled hole 5. From the bottom to the bottom 37 of the hole 5,
The ultrasonic wave sensor 29 is swung in a horizontal plane by the motor 31 of the sensor unit 27, and the ultrasonic wave output by the ultrasonic wave sensor 29 is used in the horizontal direction from the ultrasonic wave sensor 29 for the plurality of 35 hole walls of the drilled hole 5. The distance was measured, and the three-dimensional shape of the drilled hole 5 was analyzed and measured from the plurality of measurement results. Therefore, the shape of the drilled hole 5 is measured more accurately than the conventional method in which the shape of the entire drilled hole is estimated from the horizontal cross-sectional shape of the drilled hole measured at an arbitrary position, and
The area of the hole wall 35 can be accurately determined.

Further, according to the method for measuring the shape of the drilled hole of the present embodiment, the slime in the stabilizing solution 7 can be determined from the difference in the amplitude between the ultrasonic wave output by the ultrasonic sensor 29 and the reflected wave from the hole wall 35. The amount of slime in the drilling hole 5 is measured more accurately than the conventional method in which the stable liquid near the bottom of the drilling hole was collected to estimate the total amount of slime in the drilling hole. can do. Then, according to the method for measuring the shape of the drilled hole of the present embodiment, a concrete pile is placed on the hole wall 35 based on the area of the hole wall 35 and the slime amount in the drilled hole 5 measured as described above. Since the amount of concrete required for this is calculated, the amount of concrete to be placed can be accurately calculated, and it is possible to prevent excessive consumption of concrete and an increase in construction cost.

In this embodiment, the case where the concrete amount necessary for driving concrete piles into the hole wall 35 is indexed has been described. However, the slime amount in the hole 5 is measured and the amount of the hole 5 is reduced. The measurement of the shape may be performed and then the measurement may be performed by another means. The output of the measurement result and the configuration of the devices for the measurement are not limited to those shown in this embodiment. Needless to say, the method of the present invention is not limited to drilling holes formed for cast-in-place piles and is applicable to shape measurement of various drilling holes formed in the ground.

[0023]

As described above, according to the present invention, there is provided a method for measuring the shape of a drilled hole formed in the ground, in which an ultrasonic sensor is arranged in the drilled hole in a horizontal direction. Then, the ultrasonic wave is output from the ultrasonic sensor, and the reflected wave of the ultrasonic wave from the hole wall of the drilled hole is received by the ultrasonic sensor, so that the ultrasonic wave is emitted from the hole wall portion irradiated with the ultrasonic wave. The horizontal distance to the sound wave sensor is measured, and the horizontal distance is measured by continuously moving up and down from the ground to the bottom of the drilling hole while rotating the ultrasonic sensor in a horizontal plane. Based on the ascending / descending position of the sound wave sensor, the directivity in the horizontal plane, and the measurement result of the distance in the position and direction, the three-dimensional position coordinates of the plurality of positions of the hole wall are indexed, and the indexed hole wall Based on 3D position coordinates And to measure the drilling shapes have. Therefore, the shape of the drilled hole formed in the ground for cast-in-place construction can be accurately measured.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the method of the present invention applied to measuring the shape of a hole drilled in cast-in-place construction.

FIG. 2 is a block diagram showing an internal configuration of a measurement unit and a sensor unit of FIG.

FIG. 3 is a diagram showing a waveform example of an ultrasonic wave output by the ultrasonic sensor of FIG.

FIG. 4 is a diagram showing a waveform example of a reflected wave of ultrasonic waves reflected by the hole wall of the drilled hole of FIG. 1.

5 is an explanatory diagram showing an example of a display screen of a display connected to the microcomputer of FIG.

[Explanation of symbols]

 3 Ground 5 Drilling Hole 7 Stabilizer 9 Ground 19 Winding Means 21 Encoder 23 Measuring Instrument 25 Microcomputer 29 Ultrasonic Sensor 31 Motor 33 Rotary Encoder 35 Hole Wall 37 Drilling Bottom

Claims (3)

[Claims] 1. A method for measuring the shape of a drilled hole formed in the ground, wherein an ultrasonic sensor is arranged horizontally in the drilled hole, and ultrasonic waves are output from the ultrasonic sensor. Then, by receiving the reflected wave of the ultrasonic wave from the hole wall of the drilled hole with the ultrasonic sensor, the horizontal distance from the hole wall portion irradiated with the ultrasonic wave to the ultrasonic sensor is measured. , The horizontal distance is measured by continuously moving the ultrasonic sensor in a horizontal plane and moving up and down from the ground to the bottom of the drilling hole, and the vertical position of the ultrasonic sensor and the orientation in the horizontal plane. Based on the direction and the measurement result of the distance in the position and the direction, three-dimensional position coordinates of a plurality of positions of the hole wall are indexed, and based on the three-dimensional position coordinates of the plurality of positions of the indexed hole wall. Measure the shape of the hole The method for measuring the shape of a drilled hole is characterized by the above. 2. The drilling hole is formed for cast-in-place pile construction, the stabilizing solution is filled inside the drilling hole, and the amplitude of the ultrasonic wave output by the ultrasonic sensor, The difference between the ultrasonic sensor and the amplitude of the reflected wave from the hole wall is detected, and based on the detection result, the amount of slime in the stabilizing solution generated when the hole is formed is also measured. The method for measuring the shape of a drilled hole according to claim 1, wherein 3. Based on the measured shape of the drilled hole and the amount of slime in the drilled hole, the amount of concrete required when placing a concrete pile on the hole wall is also measured. The method for measuring the shape of a drilled hole according to claim 2.