JP2021063387A - In-pipe soil measuring method, and in-pipe soil measuring system - Google Patents

Abstract

To measure in a short period of time with a simple work, and to improve measuring accuracy.SOLUTION: An in-pipe soil measuring method for measuring height of an in-pipe soil 4 in an open end pile 2 includes: a step of winding-down or winding-up a crane wire 3 comprising a measuring weight 31 at a wire tip by a wire unwinding machine 32; a step of continuously capturing an outer peripheral face 3a of the crane wire 3 at a vicinity of the wire unwinding machine 32 using a capturing camera 6 with a predetermined capturing interval; a step of counting movement number of twist nodes of the crane wire 3 from an image data captured by the capturing camera 6; and a step of calculating wire displacement amount based on the calculated movement number of the twist nodes and obtaining height of the in-pipe soil based on the wire displacement amount.SELECTED DRAWING: Figure 1

Description

The present invention relates to an in-pipe soil measurement method and an in-pipe soil measurement system.

In the press-fitting method and rotary press-fitting method, in which the foundation piles of buildings and civil engineering structures are pushed in, open-ended piles with the tip open are used, and the tip is blocked by the earth and sand that has entered the pipe from the tip of the pipe. It is a construction method that demonstrates. That is, as the open end pile with the lower end of the pile released penetrates into the ground, soil invades into the pipe and the height of the soil inside the pipe increases, but when the height reaches a certain level, the friction between the inner peripheral wall of the open end pile and the soil The effect of closing the tip can be expected by force. Therefore, confirming the tip obstruction is an important management index for exerting the tip bearing capacity.
As such a management index, the height of the soil inside the pipe (reference numeral H10 shown in FIG. 7) is measured with respect to the depth at which the open end pile is penetrated, and the difference over time is calculated to cause tip blockage. It is possible to evaluate the degree of tip occlusion, which is the degree.

As a method of measuring the in-pipe soil of an open end pile during conventional construction, for example, as shown in FIG. 7, an operator approaches the pile head 100a of the open end pile 100, and a winding scale 102 with a weight 101 attached to the tip from the top of the pile. Etc. are hung in the pipe, and the distance from the pile head to the surface 103a of the pipe inner soil 103 is sequentially measured, and from the length of the open end pile measured before construction to the surface 103a of the pipe inner soil 103 from the pile head. There is known a method of measuring the height H100 of the soil 103 in the pipe by subtracting the distance. Further, when the upper end of the open end pile 100 is located at a high position from the ground surface, the worker rides on the aerial work platform to perform the measurement work.

Further, as another method for measuring the soil in the pipe, for example, as shown in Patent Document 1, a method in which a light wave range finder is installed in the pipe to continuously measure the distance from the pile head to the upper surface of the soil in the pipe has been proposed. ing.
In Patent Document 1, a light wave range finder attached to a removable clamp is set in the steel pipe pile, and the height of the soil invading the pipe when the steel pipe pile penetrates into the ground is measured in a non-contact manner. , The method of measuring the in-pipe soil for measuring the height of the in-pipe soil of the open end pile with the tip open is described.

Japanese Unexamined Patent Publication No. 2000-23234

However, the conventional pipe soil measurement method has the following problems.
That is, when the worker measures the height of the soil inside the pipe using a tape measure, the construction is interrupted, the aerial work platform approaches the open end pile, the tip of the tape measure is dropped into the pipe, the numerical value is read, and the tape measure is used. There is a problem that the work process of winding up the work platform and retracting the aerial work platform is required, which increases the time required for construction.
Further, in the method of continuously measuring by installing a light wave range finder in the pipe as shown in Patent Document 1 described above, when groundwater has entered the pipe or dust or the like during excavation is scattered in the pipe. In such cases, the measurement accuracy is significantly reduced, so there is a problem that the work of draining the pipe and waiting for a sufficient time until the scattering of dust stops is a problem, and there is room for improvement in that respect. there were.

The present invention has been made in view of the above-mentioned problems, and is an in-pipe soil measurement method and an in-pipe soil measurement system capable of measuring the height of in-pipe soil with high accuracy and can be measured in a short time by a simple operation. The purpose is to provide.

In order to achieve the above object, the in-pipe soil measuring method according to the present invention is a in-pipe soil measuring method for measuring the height of the in-pipe soil of an open end pile, and a wire having a measuring weight at the tip of the wire is used as a wire. A step of unwinding or winding by an unwinding machine, a step of continuously photographing the outer peripheral surface of the wire in the vicinity of the wire unwinding machine with an imaging camera at a predetermined imaging interval, and image data taken by the imaging camera. The wire displacement amount is calculated based on the step of counting the number of twists of the wire moved per hour and the calculated number of twists of the wire, and the height of the soil in the pipe is calculated based on the wire displacement. It is characterized by having a process of obtaining the above.

Further, the in-pipe soil measurement system according to the present invention is an in-pipe soil measurement system for measuring the height of the in-pipe soil of an open end pile, and is a wire winding capable of unwinding a wire having a measuring weight at the tip of the wire. A machine, an imaging camera that continuously photographs the outer peripheral surface of the wire in the vicinity of the wire unwinding machine at predetermined imaging intervals, and a twist of the wire per hour based on image data captured by the imaging camera. An image processing unit that counts the number of movements, and a calculation unit that calculates the displacement amount based on the number of movements of the twisted mesh calculated by the image processing unit, and obtains the height of the soil inside the pipe based on the wire displacement amount. It is characterized by having.

In the present invention, when the wire unwinder is driven to wind the wire and the measuring weight attached to the tip of the wire is landed on the surface of the soil inside the pipe of the open end pile, the wire to be wound is determined by the image pickup camera. A plurality of image data are acquired by continuously shooting at an imaging interval. Then, the number of twists of the wire moved per hour can be counted from the plurality of image data, and the displacement amount can be calculated based on the calculated number of twists of the wire to obtain the height of the soil in the pipe.
In this case, it is possible to measure the height of the soil inside the pipe using a crane equipped with a wire unwinder. Therefore, in the present invention, the open end pile is penetrated by temporarily press-fitting the open end pile, as in the case where the aerial work platform is installed near the open end pile and the measurement is performed on the aerial work platform as in the conventional case. It is possible to measure the amount of movement of the measuring weight from the amount of displacement of the wire in a short time by a simple operation without stopping the construction.

Further, in the present invention, the measuring weight is landed on the surface of the soil inside the pipe, and the twist of the outer peripheral surface of the wire to which the measuring weight is attached to the tip of the wire is photographed by an imaging camera. For example, even if groundwater invades the surface of the soil inside the pipe or dust is generated during excavation, the outer peripheral surface of the wire can be photographed to check the twist, so the inside of the pipe can be checked with high measurement accuracy. The height of the soil can be measured.
Further, in the present invention, since the imaging camera can be easily attached to and detached from, for example, a part of the crane so that the outer peripheral surface of the wire in the vicinity of the wire unwinder can be photographed, the crane to be used may be changed. However, the height of the soil inside the pipe can be measured without taking time to prepare for the measurement.

Further, in the method for measuring soil in a pipe according to the present invention, a natural period due to lateral vibration of the wire is provided so as to be able to measure the natural period of the wire when the measuring weight lands on the surface of the soil in the pipe. By detecting the weight, it may be determined that the measuring weight has landed on the surface of the soil inside the pipe.

In this case, when the measuring weight lands on the surface of the soil inside the pipe, the wire is affected by normal wind, vibration of the construction machine, and vibration when the wire is unwound or wound by the wire unwinder. Lateral runout larger than runout occurs, which is a natural period peculiar to the landing of the wire. Therefore, when the specific period of the wire shown when the measuring weight has landed on the surface of the soil inside the pipe is detected, it can be determined that the weight for measuring has landed on the surface of the soil inside the pipe. In this way, landing on the surface of the soil inside the pipe, which is invisible to the crane operator, can be performed without relying on the judgment of the crane operator, so that more accurate measurement can be performed.

Further, in the in-pipe soil measurement system according to the present invention, in the image processing unit, the captured image data is image-processed in black and white, the twisted eyes are displayed in white, and the spaces between the twisted eyes are displayed in black. It is preferable to be done.

According to the present invention, the boundary line between the twisted stitches of the wire and the portion between the twisted stitches in the image data taken by the image pickup camera is clearly displayed in black and white, so that the twisted stitches can be easily identified. Therefore, the image processing for counting the number of twisted stitches can be performed more accurately. Further, for example, even when water or oil adheres to the outer peripheral surface of the wire, the twisted mesh of the wire can be easily discriminated in black and white.

Further, the in-pipe soil measurement system according to the present invention may be characterized in that the image pickup camera is arranged so as to take a picture from the direction of the rotation axis of the wire unwinder.

In this case, since the wire moves in the rotation axis direction of the wire unwinder at the time of unwinding or winding the wire, the wire comes from the imaging range of the imaging camera arranged so as to shoot from the same rotation axis direction. It can be prevented from coming off.

According to the in-pipe soil measurement method and the in-pipe soil measurement system of the present invention, the height of the in-pipe soil can be measured with high accuracy and can be measured in a short time by a simple operation.

It is a side view which shows the structure of the pipe soil measurement system by embodiment of this invention. It is a figure which shows an example of the image taken by the image pickup camera of the in-pipe soil measurement system. It is a block diagram which shows typically the image processing apparatus of a pipe soil measurement system. (A) to (c) are diagrams showing the work procedure of the pipe soil measurement method by the pipe soil measurement system. It is a figure for demonstrating the processing method by an image processing unit using a plurality of image data photographed by an image pickup camera. It is a figure for demonstrating the position of the image pickup camera with respect to a wire unwinder, FIG. It is a figure seen from the direction orthogonal to the rotation axis. It is a figure which shows the working state of the conventional pipe soil measurement.

Hereinafter, the in-pipe soil measurement method and the in-pipe soil measurement system according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the in-pipe soil measurement system 1 according to the present embodiment measures the height of the in-pipe soil 4 at the time of construction or completion of construction of an open-ended steel pipe pile (hereinafter referred to as open-ended pile 2) having an open tip. , When the measurement weight 31 is landed on the surface 4a corresponding to the upper surface of the pipe inner soil 4 by the crane 30 and the height of the pipe inner soil is measured, the image data of the crane wire 3 (reference numeral D shown in FIG. 2 to be described later). ) Is a system that continuously and accurately measures by photographing.

As the open end pile 2, for example, a rotary press-fit pile used for rotary press-fitting work, which is formed in a cylindrical shape and has blades (not shown) provided on the outer peripheral surface of the lower end portion of the steel pipe pile, can be adopted. The open end pile 2 is driven into the ground by a striking method using a pile driving hammer, a press-fitting method, a rotary press-fitting method, or the like. In the present embodiment, the construction is performed by the rotary press-fitting method using the rotary press-fitting machine 5. In the construction of the open end pile 2 by the rotary press-fitting method, when the open end pile 2 penetrates into the ground, soil invades into the pipe from the pile tip 2b (see FIG. 4 (b)), and the height of the pipe inner soil 4 increases. The action of closing the pile tip 2b occurs.

Here, the rotary press-fitting machine 5 shown in FIG. 1 is a device in which the open end pile 2 is gripped from the outer peripheral side and pushed downward by a hydraulic jack to penetrate into the ground, and the steel pipe piles are sequentially added to a predetermined depth. Is.

The in-pipe soil measurement system 1 includes a wire unwinder 32 provided on the crane 30 and capable of unwinding a crane wire 3 provided with a measuring weight 31 at a wire tip 3b, and a vicinity of the wire unwinder 32 (immediately after wire delivery). The image pickup camera 6 that continuously photographs the outer peripheral surface 3a of the crane wire 3 at a predetermined imaging interval, and the pipe inner soil 4 based on a plurality of image data D (see FIG. 2) captured by the image pickup camera 6. It includes an image processing device 10 (see FIG. 3) for determining the height.

The crane 30 is a mobile crane provided with a traveling portion 33 made of a well-known crawler, and a swingable base portion 34 is provided on the traveling portion 33, and a boom 35 and the wire unwinder 32 are provided on the base portion 34. , And the operation room 36 are equipped.

The crane wire 3 has a structure in which several strands (twisted wires) made by twisting several to several tens of strands are twisted together, and each twisted wire has a substantially cylindrical shape. .. That is, as the crane wire 3, as shown in FIG. 2, a wire having a twisted mesh 3A formed at a fixed interval (for example, a twisted mesh interval d of 50 mm) is used. Here, the twisted mesh interval d is defined as a twisted mesh interval d. As shown in FIG. 2, it refers to the distance between strands adjacent to each other in the wire length direction when the crane wire 3 is viewed from the side.

Further, the crane wire 3 is wound around the wire unwinder 32, and the wire tip 3b is lowered via the sheave 35a at the tip of the boom 35. A measuring weight 31 is attached to the wire tip 3b via a hook 37. The measuring weight 31 may be, for example, a weight of about 5 kg, or the hook 37 provided at the wire tip 3b may be used as the measuring weight 31. The measuring weight 31 may be changed to a weight corresponding to the wind speed.

The image pickup camera 6 is fixed to the base portion 34 in the vicinity of the wire unwinder 32, and is arranged so as to take a picture from the rotation axis direction of the wire unwinder 32. As shown in FIG. 2, the image pickup camera 6 is installed so that a plurality of twisted stitches 3A can be captured by one image on the outer peripheral surface 3a of the crane wire 3. Then, the image data D is acquired by the image pickup camera 6 at an image pickup interval of, for example, 0.02 seconds.

As shown in FIG. 3, the image processing device 10 has an image processing unit 11, a calculation unit 12, and a display unit 13. The image processing device 10 may be realized by a computer, for example, may be provided in the operation room 36 of the crane 30 shown in FIG. 1, or may be moved to the vicinity of the open end pile 2 measured by the measurer. It may be possible.

In the image processing unit 11, the image data D taken by the image pickup camera 6 at a constant imaging interval is transmitted wirelessly or by wire, and the number of twisted stitches 3A of the crane wire 3 per hour is moved based on the input image data D. Image processing is performed to count.

The image processing unit 11 has a function of automatically adjusting the contrast and brightness so that it is easy to distinguish between the large twisted eyes 3A and the large twisted eyes 3A according to the shooting conditions such as cloudiness and the amount of sunshine. It may be. For example, in the image processing unit 11, the captured image data D is image-processed in black and white, and the contrast and brightness of the image are adjusted to display the large twisted eyes 3A in white and the large twisted eyes 3A and 3A to each other. The space between them can be displayed in black.

The calculation unit 12 calculates the wire speed based on the number of movements of the twisted stitch 3A calculated by the image processing unit 11, and performs a process of obtaining the height of the soil 4 in the pipe. The arithmetic unit 12 performs arithmetic processing when a processor such as a CPU as an arithmetic circuit and a control circuit executes a program stored in a memory.

In the calculation unit 12, the wire displacement corresponding to the winding distance (the falling distance of the wire tip 3b (measurement weight 31)), which is the amount of movement of the crane wire 3, from the number of movements of the twisted mesh 3A obtained by the image processing unit 11. The amount is calculated, and the position of the measuring weight 31 at the wire tip 3b (height H0 of the pipe inner soil 4 shown in FIG. 4C) is obtained.

From the height H0 of the pipe inner soil 4 during penetration of the open end pile 2 obtained by the calculation unit 12, the open end pile is based on the relationship between the conditions such as soil quality and pipe diameter verified in advance and the height H0 of the pipe inner soil 4. It is possible to estimate the occlusion rate of 2. Further, the tip resistance of the open end pile 2 can be evaluated from this blockage rate.

The display unit 13 is a liquid crystal display or the like (not shown), and displays information such as the height H0 of the in-pipe soil 4 obtained by the calculation unit 12, the closed state of the open end pile 2, and the tip resistance.

Next, a processing procedure for measuring the height H0 of the pipe inner soil 4 of the open end pile 2 using the above-mentioned pipe inner soil measurement system 1 will be specifically described with reference to the drawings. In addition, in FIGS. 4A to 4C, the rotary press-fitting machine 5 shown in FIG. 1 is omitted for easy viewing.
As shown in FIGS. 4A to 4C, as a method for measuring the soil inside the pipe, a step of winding down or winding up a crane wire 3 having a measuring weight 31 at a wire tip 3b by a wire unwinder 32 is used. The step of continuously photographing the outer peripheral surface 3a of the crane wire 3 in the vicinity of the wire unwinder 32 with the image pickup camera 6 at a predetermined imaging interval, and the image data D (see FIG. 2) taken by the image pickup camera 6 per hour. The wire speed is calculated based on the process of counting the number of movements of the twisted mesh 3A of the crane wire 3 and the calculated number of twisted meshes 3A, the wire displacement amount is calculated from the wire speed, and the amount of wire displacement is calculated based on the wire displacement amount. It has a step of determining the height H0 of the inner soil 4 of the pipe.

Specifically, first, as shown in FIGS. 4A and 4B, the open end pile 2 is driven to a predetermined depth by using the rotary press-fitting machine 5 shown in FIG. Then, the reference height with the ground surface G as the reference plane is set to 0 m. In the crane 30, the measuring weight 31 attached to the wire tip 3b of the crane wire 3 lands on the ground surface G, and the feeding length (reference length) of the crane wire 3 at this time is measured. The reference plane is not limited to the ground surface G, and may be a structure such as a foundation exposed on the ground surface G as long as the height of the pipe soil 4 can be measured under the same conditions. Absent.

Here, the depth from the ground surface G to the pile tip 2b of the open end pile 2, that is, the driving depth H2, is a display value or a survey measured by a construction machine (rotary press-fitting machine 5) that rotationally press-fits the open-end pile 2. It can be confirmed by the measured value based on.

Next, as shown in FIG. 4C, the measuring weight 31 is unwound from the crane wire 3 and lowered into the pipe together with the crane wire 3, and the moment when the measurement weight 31 lands on the surface 4a of the soil 4 in the pipe is confirmed. .. As a method of confirming the bottoming of the measuring weight 31 at this time, the crane operator can visually confirm that the crane wire 3 has slackened. While the crane wire 3 is unwound and the measuring weight 31 is lowered, the image pickup camera 6 continuously photographs the crane wire 3, for example, 60 frames per second.
If the height H5 of the surface 4a of the pipe inner soil 4 is known from the ground surface G, the height H0 (= H5-H2) of the pipe inner soil 4 can be calculated from the difference from the driving depth H2.

In addition, by measuring a certain distance in advance, for example, about 2 m, and moving the crane within that range to measure the image, it is possible to calibrate the brightness and shading processing conditions of the captured image. It is possible to improve the measurement accuracy.

In addition, the natural period due to the lateral vibration of the crane wire 3 may be provided so as to be measurable. Then, since the natural period changes depending on the tension of the crane wire 3, the measuring weight 31 detects the unique natural period of the crane wire 3 when it lands on the surface 4a of the inner soil 4 of the pipe, so that the measuring weight 31 can move. It may be determined that the bottom surface 4a of the pipe inner soil 4 has landed. Assuming that the length from the drum (wire unwinder 32) of the hoisting rope to the tip of the boom is the free portion L1, when the measuring weight 31 has landed, it depends on the length of the free portion L1 and the tension immediately before landing. Since it vibrates laterally with a natural period, it is judged that the ship has landed.

Next, a method of calculating the height H0 of the soil 4 in the pipe from the image data D acquired by the image pickup camera 6 will be described.
As shown in FIG. 3, the image data D captured by the image pickup camera 6 is transmitted to the image processing unit 11 of the image processing device 10. At this time, the image data D may be transmitted to the image processing unit 11 in real time, or stored in the storage area on the image pickup camera 6 side for each step of lowering the measurement weight 31. Image data D may be transmitted in a batch.

Subsequently, as shown in FIG. 5, the image processing unit 11 counts the number of movements of the twisted mesh 3A of the crane wire 3 per hour from the image data D input from the image pickup camera 6, and the measurement weight 31 Calculate the fall distance.

FIG. 5 is a diagram showing an example of an image processing method, and shows five image data D1 to D5 taken continuously at intervals of 0.02 seconds. Note that FIG. 5 is an image from the left to the right of the paper in chronological order. These image data D1 to D5 are taken at the time of winding the crane wire 3 and in a state where the crane wire 3 is moving downward on the paper surface of FIG. Further, in FIG. 5, the alternate long and short dash line indicates the range of the image, and the alternate long and short dash line E1, E2, and E3 indicate the scale at which the distance between them is 50 mm. Comparing the first image of reference numeral D1 (first image D1) and the second image of reference numeral D2 (second image D2) taken 0.02 seconds later, the first twist located at the top is compared. The lower end position P1 of the eye 3Aa is determined by image processing to be a movement amount (wire displacement amount) of 25 mm in the first image D1 to the second image D2. Since the hoisting speed of the crane wire 3 is constant, the lower end position P1 of the first twist 3Aa also moves 25 mm for each image in the third image D3, the fourth image D4, and the fifth image. It is a quantity. Then, only 25 mm from the first image D1 to the fifth image D5 for the second twist 3Ab located directly below the first twist 3Aa and for the third twist 3Ac directly below the second twist 3Ab. It is moving downwards. That is, each of the 100 mm twisted stitches 3A moves downward in 0.08 seconds in the five images.
In this way, the image processing unit 11 counts the number of movements of the twisted stitch 3A and calculates the amount of movement (wire displacement amount) of the twisted stitch 3A.

Next, in the calculation unit 12 shown in FIG. 3, the winding distance (the drop of the wire tip 3b (measurement weight 31), which is the amount of movement of the crane wire 3 from the number of movements of the twisted stitch 3A obtained by the image processing unit 11). Calculate the amount of wire displacement corresponding to the distance).

Then, as shown in FIGS. 4B and 4C, the wire displacement amount H5 from the ground surface G to the surface 4a of the pipe inner soil 4 is obtained, and as described above, the pile tip of the open end pile 2 is obtained from the ground surface G. Since the distance to 2b (driving depth H2) is measured, the height H0 of the pipe inner soil 4 (the surface of the pipe inner soil 4 from the pile tip 2b of the open end pile 2) is obtained by subtracting the wire displacement amount H5 from the driving depth H2. Height up to 4a) can be calculated. For example, as described above, since the driving depth H2 is 5 m and the wire displacement amount H5 is 2 m, the height H0 of the pipe inner soil 4 is 3 m.

Next, the above-mentioned in-pipe soil measurement method and the operation of the in-pipe soil measurement system will be described in detail with reference to the drawings.
In the in-pipe soil measurement method and the in-pipe soil measurement system according to the present embodiment, as shown in FIGS. 4A to 4C, the wire unwinder 32 is driven to wind down the crane wire 3 and attach it to the wire tip 3b. When the measuring weight 31 is landed on the surface 4a of the pipe inner soil 4 of the open end pile 2, a plurality of images of the outer peripheral surface 3a of the crane wire 3 to be wound down are continuously photographed by the imaging camera 6 at predetermined imaging intervals. Acquire the image data D. Then, the number of movements of the twisted mesh 3A of the crane wire 3 is counted from the plurality of image data D, and the wire displacement amount is calculated based on the calculated number of twisted stitches 3A to obtain the height H0 of the soil 4 in the pipe. be able to.

In this case, it is possible to measure the height H0 of the soil 4 in the pipe by using the crane 30 provided with the wire unwinder 32. Therefore, in the present embodiment, the open end pile 2 is temporarily press-fitted by rotational press-fitting, as in the case where the aerial work platform is installed in the vicinity of the open end pile 2 and the measurement is performed on the aerial work platform as in the conventional case. It is possible to measure the amount of movement of the measuring weight 31 from the amount of displacement of the crane wire 3 in a short time by a simple operation without stopping the construction of penetrating the crane wire 3.

Further, in the present embodiment, the measuring weight 31 is landed on the surface 4a of the inner soil 4 of the pipe, and the twisted mesh 3A of the outer peripheral surface 3a of the crane wire 3 to which the measuring weight 31 is attached to the wire tip 3b is formed. Since it is a method of taking a picture with the image pickup camera 6, for example, even if groundwater invades the surface 4a of the inner soil 4 of the pipe or dust is generated during excavation, the outer peripheral surface 3a of the crane wire 3 is taken. Since the twisted 3A can be confirmed, the height of the soil 4 in the pipe can be measured with high measurement accuracy.

Further, in the present embodiment, when the measuring weight 31 lands on the surface 4a of the inner soil 4, the crane wire 3 is subjected to normal wind or vibration of the construction machine, and the crane wire 3 is wound down by the wire unwinder 32. Alternatively, a lateral vibration larger than the lateral vibration due to the influence of the vibration at the time of hoisting is generated, and the natural period peculiar to the landing of the crane wire 3 is obtained. Therefore, when the measurement weight 31 detects the unique natural period of the crane wire 3 shown when the measuring weight 31 lands on the surface 4a of the pipe inner soil 4, the measuring weight 31 lands on the surface 4a of the pipe inner soil 4. Can be judged. In this way, the landing of the in-pipe soil 4 on the surface 4a, which is invisible to the crane operator, can be performed without relying on the judgment of the crane operator, so that more accurate measurement can be performed.

Further, in the present embodiment, the image processing unit 11 processes the captured image data D in black and white. Then, the boundary line between the twisted stitch 3A of the crane wire 3 and the portion between the twisted stitches 3A and 3A in the image data D taken by the image pickup camera 6 is clearly displayed in black and white, so that the twisted stitch 3A It becomes easier to discriminate between the two, and the image processing for counting the number of movements of the twisted stitch 3A can be performed more accurately. Moreover, for example, even when water or oil adheres to the outer peripheral surface 3a of the crane wire 3, the twisted stitch 3A of the crane wire 3 can be easily discriminated in black and white.

Further, in the present embodiment, as shown in FIGS. 6A to 6C, the crane wire 3 moves in the rotation axis direction X1 of the wire unwinder 32 at the time of unwinding or winding the crane wire 3. By arranging the imaging camera 6 (see FIG. 1) so as to shoot from the same rotation axis direction X1, the imaging range can be reduced. That is, as shown in FIG. 6C, when the image pickup camera 6 takes a picture from the direction X2 orthogonal to the rotation axis of the wire unwinder 32, the movement distance l in the rotation axis direction X1 of the crane wire 3 _{Since 1} is large, it is necessary to widen the imaging range of the imaging camera 6. On the other hand, when shooting with the image pickup camera 6 from the rotation axis direction X1 as in the present embodiment shown in FIG. 6 (b), the moving distance l ₂ of the crane wire 3 moving in the shooting range is small, so that the shooting camera The imaging range can be reduced, and the required performance of the camera and the amount of data to be handled can be kept low.

Other methods can be considered for calculating the height H0 of the soil 4 in the pipe. As shown in FIG. 4C, the measuring weight 31 is temporarily stopped so that the position above the upper end 2a of the open end pile 2 is set as the reference plane, and the measuring weight 31 is unwound by the crane wire 3. It is lowered into the pipe together with 3, and the height H3 to the position where it has landed on the surface 4a of the soil 4 in the pipe is confirmed. Since the pile length H4 is known, the height H0 (= H4-H3) of the pipe inner soil 4 is determined from the difference between the pile length H4 and the height H3 from the upper end 2a of the open end pile 2 to the surface 4a of the pipe inner soil 4. Can be calculated.

In the in-pipe soil measurement method and the in-pipe soil measurement system according to the present embodiment described above, measurement can be performed in a short time by a simple operation, and the measurement accuracy can be improved.

Although the method for measuring in-pipe soil and the embodiment of the in-pipe soil measurement system according to the present invention have been described above, the present invention is not limited to the above-described embodiment and can be appropriately changed without departing from the spirit of the present invention.

For example, in the above-described embodiment, the wire unwinder 32 is mounted on the mobile crane 30, but the present invention is not limited to such a crane, and the wire unwinder alone is not limited to such a crane. It may be provided.

Further, the mounting position of the image pickup camera 6 is not limited to being arranged so as to take a picture from the rotation axis direction of the wire unwinder 32 as in the above-described embodiment.

Further, in the present embodiment, the rotary press-fitting machine 5 is adopted for the penetration of the open end pile 2, but a rotary press-fitting method by another construction method may be adopted.

In addition, it is possible to replace the components in the above-described embodiment with well-known components as appropriate without departing from the spirit of the present invention.

1 Pipe soil measurement system 2 Open end pile 2a Upper end 2b Pile tip 3 Crane wire (wire)
3a Outer surface 3b Wire tip 3A Twist 4 Pipe inner soil 4a Surface 5 Rotation press-fitting machine 6 Imaging camera 10 Image processing device 11 Image processing unit 12 Calculation unit 13 Display unit 30 Crane 31 Measuring weight 32 Wire unwinder d Twist spacing Height of soil in H0 pipe G Ground surface

Claims (5)

It is a method of measuring the soil inside the pipe of the open end pile, and it is a method of measuring the soil inside the pipe.
The process of unwinding or winding a wire with a measuring weight at the tip of the wire with a wire unwinder.
A step of continuously photographing the outer peripheral surface of the wire in the vicinity of the wire unwinder with an imaging camera at predetermined imaging intervals, and
A process of counting the number of twists of the wire per hour from the image data taken by the imaging camera, and a step of counting the number of twists of the wire.
A step of calculating the wire displacement amount based on the calculated number of twisted stitches and obtaining the height of the soil in the pipe based on the wire displacement amount.
A method for measuring in-pipe soil, which is characterized by having. The natural period due to the lateral runout of the wire is provided so that it can be measured.
It is characterized in that it is determined that the measuring weight has landed on the surface of the soil inside the pipe by detecting the specific period of the wire when the weight has landed on the surface of the soil inside the pipe. The method for measuring soil in a pipe according to claim 1. It is an in-pipe soil measurement system for measuring the height of in-pipe soil of open-ended piles.
A wire unwinder that can unwind a wire with a measuring weight at the tip of the wire,
An imaging camera that continuously photographs the outer peripheral surface of the wire in the vicinity of the wire unwinder at predetermined imaging intervals, and
An image processing unit that counts the number of twists of the wire from the image data taken by the image pickup camera, and an image processing unit.
A calculation unit that calculates the amount of wire displacement based on the number of movements of the twisted stitches calculated by the image processing unit, and obtains the height of the soil inside the pipe based on the amount of wire displacement.
In-pipe soil measurement system characterized by being equipped with. The third aspect of claim 3, wherein in the image processing unit, the captured image data is image-processed in black and white, the twisted stitches are displayed in white, and the space between the twisted stitches is displayed in black. In-pipe soil measurement system. The in-pipe soil measurement system according to claim 3 or 4, wherein the image pickup camera is arranged so as to take a picture from the direction of the rotation axis of the wire unwinder.

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