Target location management method

Abstract

In construction work to verify the accuracy of steel pipe columns, even if there is a deviation from the position and orientation specified in the design at the top of the steel pipe column, the positional information of the target relative to the reference markings will be accurately acquired and managed. [Solution] The system includes a unit-side measurement step of using a three-dimensional measuring device 20 to measure the three-dimensional position of a measuring unit 80 equipped with a camera integrally attached to the upper part of a steel pipe column and to acquire position information; a target-side measurement step of continuously or intermittently acquiring position information of a target relative to a camera based on an image of the inside of the steel pipe column captured by the camera; and a target position acquisition step of acquiring position information of a target relative to a reference line based on the position of a known point relative to a reference line, the position information of the measuring unit 80 acquired in the unit-side measurement step, and the position information of the target acquired in the target-side measurement step at the same time.

Description

Technical Field

[0001] The present invention relates to a method for managing the position of a target installed in a steel pipe column in order to manage the installation accuracy of the steel pipe column.

Background Art

[0002] Conventionally, when constructing the underground structure of a building by adopting the reverse casting method, after excavating the ground to construct a borehole in the ground, a reverse casting support column composed of a column body and a pile body made of steel pipes is constructed in this borehole in the ground. Since the weight of the building is supported by this reverse casting support column, it is important to manage the installation accuracy (vertical accuracy) of the column body built in the borehole in the ground. For this reason, many systems and methods for managing the installation accuracy have been studied.

[0003] Patent Document 1 discloses a method for measuring the installation error of a steel pipe forming a reverse casting support column. Specifically, a target is attached to the upper surface of the base plate of the steel pipe, and a camera is installed at the head of the steel pipe arranged in accordance with the reference ink for the planar position. After that, the inside of the steel pipe is imaged by the camera, and the measured coordinates of the target in the imaged image are calculated by image processing. Further, when the camera is not installed horizontally on the head of the steel pipe, the tilt angle of the camera is acquired, and the measured coordinates of the target are corrected based on the tilt angle.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to Patent Document 1, even if the camera is not installed horizontally, the installation error can be determined with high accuracy by correcting the target's measurement coordinates obtained from the captured image. This management of installation errors is carried out continuously even after the steel pipe has been installed in the underground hole and concrete is being poured into the underground hole to construct the pile body.

[0006] However, during concrete pouring, if unforeseen circumstances occur, such as workers or the tremie pipe coming into contact with the steel pipe on which the camera is installed, or if lateral pressure from the concrete acts on the steel pipe, the upper part of the steel pipe on which the camera is installed may shift position, or the steel pipe may tilt. In such cases, the three-dimensional position of the camera relative to the reference line becomes unknown. As a result, even if the position of the target relative to the camera can be determined, the position of the target relative to the reference line cannot be determined.

[0007] The present invention has been made in view of the above problems, and its main purpose is to accurately acquire and manage positional information of the target relative to the reference mark in construction work in which a camera equipped with a measuring unit attached to the top of a steel pipe column is used to image a target inside the steel pipe and confirm the accuracy of the erection of the steel pipe column, even when there is a deviation from the position and orientation specified in the design at the top of the steel pipe column. [Means for solving the problem]

[0008] To achieve this objective, the present invention provides a target position management method for managing the position of a target installed inside a steel pipe column erected in an underground hole, comprising: a unit-side measurement step of installing a three-dimensional measuring device at a known point where the coordinate values ​​set based on a reference mark are known, and using the three-dimensional measuring device to measure the three-dimensional position of a measuring unit equipped with a camera integrally attached to the upper part of the steel pipe column and acquiring position information; a target-side measurement step of continuously or intermittently acquiring position information of the target relative to the camera based on an image of the inside of the steel pipe column captured by the camera; and a target position acquisition step of acquiring position information of the target relative to a reference mark based on the position of the known point relative to the reference mark, the position information of the measuring unit acquired in the unit-side measurement step, and the position information of the target acquired in the target-side measurement step at the same time.

[0009] The target position management method of the present invention is characterized by comprising: a displacement amount calculation step in which the unit-side measurement step is performed continuously or intermittently, and each time the position information of the measurement unit is acquired, the difference between that and the initial position information of the measurement unit is acquired as the displacement amount; and a displacement amount determination step in which it is determined whether or not the displacement amount exceeds a preset threshold.

[0010] The method for managing the position of a target according to the present invention is characterized in that the displacement amount calculation step and the displacement amount determination step are performed during the work of pouring concrete into the underground hole, and the method includes a position correction step in which the position of the steel pipe column relative to the underground hole is corrected if the displacement amount exceeds a predetermined threshold in the displacement amount determination step.

[0011] According to the target position management method of the present invention, the position information of a measuring unit installed on the upper part of a steel pipe column is acquired using a three-dimensional measuring device installed at a known point set based on a reference line. As a result, even if the upper part of the steel pipe column to which the measuring unit is attached deviates from the position and orientation defined in the design due to unforeseen circumstances, the position information of the target installed inside the steel pipe column relative to the reference line can be acquired and managed based on the position information of the measuring unit relative to the reference line and the position information of the target relative to the camera equipped on the measuring unit.

[0012] Therefore, for example, during the process of pouring concrete into an underground hole in which a steel pipe column has been erected, if the steel pipe column is affected by lateral pressure from the concrete, causing it to shift or tilt from the position and orientation specified in the design, positional information relative to the target reference line that reflects these events can be obtained, thereby ensuring the reliability of the positional information.

[0013] Furthermore, by continuously or intermittently acquiring positional information of the measurement unit using a three-dimensional measuring device, it is possible to simultaneously acquire and manage positional information of the target relative to the reference mark over time. At this time, each time positional information of the measurement unit is acquired, the difference between this acquisition and the initial positional information (positional information of the measurement unit when the steel pipe column is in the position and orientation specified in the design) can be calculated as the displacement amount. Based on this displacement amount, the position of the steel pipe column can be corrected, which can contribute to ensuring the accuracy of the installation of the steel pipe column into the underground hole. [Effects of the Invention]

[0014] According to the present invention, in construction work to confirm the accuracy of the erection of a steel pipe column by imaging a target inside the steel pipe with a camera equipped on a measuring unit integrally attached to the top of the steel pipe column, by measuring the position information of the measuring unit with respect to the reference line, even if there is a deviation from the position and orientation specified in the design on the top of the steel pipe column, it becomes possible to grasp and manage the position of the target inside the steel pipe with respect to the reference line, as imaged by the camera equipped on the measuring unit. [Brief explanation of the drawing]

[0015] [Figure 1] This figure shows a schematic diagram of the method for constructing inverted support columns according to an embodiment of the present invention. [Figure 2] This figure shows a measuring unit and a measurement point prism according to an embodiment of the present invention. [Figure 3] This figure shows a target and position adjustment device according to an embodiment of the present invention. [Figure 4] This figure shows a location management system according to an embodiment of the present invention. [Figure 5] This diagram shows a flowchart of the procedure for acquiring and managing target position information relative to a reference ink line in an embodiment of the present invention. [Figure 6] This figure shows an example of the output of a location management system in an embodiment of the present invention. [Modes for carrying out the invention]

[0016] The following describes, in detail, the case in which a steel pipe column, formed by connecting multiple steel pipes, is used as the column body for an inverted support column, referring to Figures 1 to 6. Before that, we will first briefly explain the construction method of the inverted support column 100.

[0017] <<<Outline of the method for constructing reverse-mounted support pillars>>> As shown in Figure 1(a), a reinforcing cage 111 is erected in a borehole H filled with stabilizing fluid W, and then a column body 120 comprising a column body 130 and an anchoring section 140 is erected. The column body 130 consists of a steel pipe column formed by connecting multiple steel pipes 131 in the axial direction using mechanical joints (so-called screw-type joints) through the borehole H, and the anchoring section 140 is inserted into the reinforcing cage 111.

[0018] The column body 120 is supported by a steel pipe fixing gantry 220 arranged on the ground via a yoke 200, and is position - adjusted in the ground hole H so as to be in the position and posture determined in the design, and further so that the head of the column body 120 is at a predetermined height position. Also, the yoke 200 is adjusted to be in a predetermined position in plan view (a position where the axis coincides with the column core), and is fixed to the head of the column body 120. After that, a measurement unit 80 is installed on the yoke 200.

[0019] As shown in FIG. 2, the measurement unit 80 stores at least a camera 82 and an inclinometer in a storage case 81, and is integrally installed on the inner diaphragm 201 of the yoke 200 via an equipment installation gantry 70. At this time, the optical axis Oa of the camera 82 provided in the measurement unit 80 is arranged on the central axis of the column body 120 (yoke 200) (that is, the Z - axis of the camera coordinate system coincides with the column core). Also, the X - axis and Y - axis of the camera coordinate system are arranged at positions that coincide with the through - core a and through - core b that are orthogonal to each other on the column body 120 in the design drawing.

[0020] In this way, the camera 82 integrally installed on the upper part of the column body 120 via the yoke 200 images a target 90 provided inside the column body 120 as shown in FIG. 3(a), and acquires an imaging image. By presetting the installation height of the target 90 in the column body 120, based on the imaging image captured by the camera 82, the position information of the target 90 with respect to the camera 82 can be acquired in three - dimensions by image processing, and the erection accuracy of the column body 120 can be managed.

[0021] The target 90 is provided on the steel pipe 131a to be measured, which is one of the multiple steel pipes 131 that make up the column 120, as shown in Figure 1(b). Multiple targets are installed on the upper surface of the inner diaphragm 132 of the steel pipe 131a to be measured, as shown in Figure 3(a). In this embodiment, an example is given in which four targets 90 are placed at equidistant from the central axis Cv of the column 120, and at positions through which the orthogonal grid lines a and b pass over the column 120 in the design drawing. However, the placement position and number of targets 90 are not limited to this.

[0022] When multiple targets 90 are provided, they can be placed at any position at the same height, provided that their planar position relative to the central axis Cv of the column 120 is specified. When only one target is provided, it is preferable to place it on the central axis Cv of the column 120. The installation accuracy of the column 120 is managed based on the position coordinates of such targets 90 in the captured image.

[0023] For managing the erection accuracy, for example, if multiple targets 90 are placed on the inner diaphragm 132 of the steel pipe 131, the amount of circumferential rotational displacement of the column 120 (or the steel pipe 131a being measured) is measured in addition to the erection error (vertical accuracy) of the column 120. A method for managing both the erection accuracy (vertical accuracy) of the column 120 and the circumferential rotational displacement of the column 120 (or the steel pipe 131a being measured) as the erection accuracy of the column 120 using such multiple targets 90 is referred to in Japanese Patent Application No. 2024-112384. On the other hand, if only one target 90 is placed on the central axis Cv of the column 120, only the erection error (vertical accuracy) of the column 120 is measured. A method for managing the erection accuracy (vertical accuracy) of the column 120 as the erection accuracy of the steel pipe column using such a single target 90 is referred to in Japanese Patent Publication No. 5786644.

[0024] If the measurement result regarding the erection error of the column 120 exceeds a predetermined threshold range, management is performed, such as correcting the plan view position of the steel pipe 131a being measured in the underground borehole H, as shown in Figure 1(b). For example, as shown in Figure 3(b), the expansion joint 210 is used to correct the plan view position of the steel pipe 131a being measured, on which the target 90 is installed, in order to ensure the verticality of the column 120. Multiple expansion joints 210 are installed at equal intervals on the outer surface of the steel pipe 131a being measured, and are devices that expand and contract radially toward the borehole wall of the underground borehole H.

[0025] In this way, the verticality of the column 120 is ensured, and if there is any rotational displacement in the circumferential direction, the amount of displacement is confirmed, and then concrete 112 is poured to embed the reinforcing cage 111 and the anchoring portion 140 of the column 120, as shown in Figure 1(c).

[0026] During the concrete placement work of the concrete 112, the erection accuracy of the column 120 is continuously or intermittently managed based on the position coordinates on the captured image of the target 90. For example, the concrete placement work is carried out while correcting the plan view position of the steel pipe 131a being measured, so that the measurement results regarding the erection error do not fall outside the range of the management target value due to the lateral pressure of the concrete 112 discharged from the tremie pipe, thereby eliminating the erection error of the column 120.

[0027] After the concrete 112 pouring work is completed and the prescribed curing period has elapsed, backfilling work is carried out by filling the underground hole H with backfill material S, as shown in Figure 1(d). Any type of backfill material S may be used, but for example, fluidized soil is used, and the underground hole H is filled using a tremie pipe, similar to when the concrete 112 was poured. In this way, an inverted support column 100 is constructed, consisting of a pile body 110 made of a reinforcing cage 111 and concrete 112, and a column body 120.

[0028] In the inverted construction method of the support column carried out in this manner, after ensuring the verticality of the column body 120, the position of the measurement unit 80 relative to the reference mark is constantly monitored until the concrete pouring work of 112 is completed, thereby also managing the position of the target 90 relative to the reference mark. The position management of the target 90 is carried out using the position management system 10 shown below.

[0029] <<<Location Management System>>> As shown in Figure 4, the position management system 10 includes a total station 20, a measurement point prism 30, a total station controller 40, and a position management device 50.

[0030] The total station 20 employs an automatic tracking system and is installed at a known point A near the underground hole H. Known point A can be placed anywhere within the construction area, as long as its position relative to the reference mark is specified. The total station 20, installed in this manner, is a device that measures the three-dimensional position coordinates of the measurement point prism 30 by irradiating it with laser light to automatically track the measurement point prism 30 and measuring its distance and angle.

[0031] The measurement point prism 30 can be any commercially available type, and as shown in Figure 2, for example, it comprises a holder 31 and a prism 32 attached to the tip of the holder 31. In this embodiment, the measurement point prism 30 is provided in the case of a storage case 81 of the measurement unit 80. The measurement unit 80 is fixed to the top of the pliers 200 via the equipment mounting stand 70, and the example given is that it does not move relative to the pliers 200.

[0032] The total station controller 40 is connected to the total station 20 by wire or wireless connection, automatically controls the total station 20, and processes the data (survey data) measured by the total station 20. The processed measurement data is then output to the position management device 50 as measurement point prism 30 (measurement unit 80) position information via a communication network such as wired, wireless, or the internet.

[0033] The location management device 50 can be any terminal device such as a notebook PC, tablet, or smartphone, and the input unit 51 receives location information input from, for example, a total station controller 40. It also has a configuration that connects to input devices such as a keyboard, mouse, scanner, or touch panel and receives information input to these devices.

[0034] The output unit 52 is connected to a display device 60, such as a display or printer, and outputs information received by the input unit 51 and information generated by the arithmetic processing unit 53 to the display device 60. The display device 60 may be configured to include a touch panel, in which case the display device 60 is configured to serve as both the output unit 52 and the input unit 51. The storage unit 54 consists of a semiconductor memory or a hard disk drive, and stores information received by the input unit 51 and information generated by the arithmetic processing unit 53.

[0035] The arithmetic processing unit 53 is a computer that performs predetermined control according to a program, and includes a CPU (Central Processing Unit), storage devices such as ROM (Read Only Memory) and RAM (Random Access Memory), and hardware interfaces. This storage device includes, for example, an information acquisition unit 531, a target position calculation unit 532, a displacement amount calculation unit 533, and a displacement amount determination unit 534.

[0036] As will be described in detail later, the information acquisition unit 531 acquires position information of the measurement unit 80 (measurement point prism 30) that is continuously or intermittently input from the total station controller 40, and position information of the target 90 relative to the camera 82 that is input from the measurement unit 80. The target position calculation unit 532 calculates the position information of the target 90 relative to the reference line based on the position of known point A relative to the reference line (the installation position of the total station 20), the position information of the measurement unit 80, and the position information of the target 90 acquired at the same time. The displacement amount calculation unit 533 calculates the amount of displacement from the initial position information (position information before concrete pouring) each time position information of the measurement unit 80 is input. The displacement amount determination unit 534 determines whether the amount of displacement exceeds a preset threshold.

[0037] <<<Target Location Management Method>>> Using the position management system 10 described above, the procedure for managing the position of the target 90 relative to the reference mark while constantly monitoring the position of the measurement unit 80 during the period from ensuring the verticality of the column 120 until the concrete pouring work of 112 is completed will be explained with reference to the flowchart in Figure 5.

[0038] <<<Pre-concrete pouring stage>>> ≪Unit-side measurement process (acquisition of position information of the measurement unit before concrete pouring): STEP 1≫ As explained with reference to Figure 1(b), after ensuring the verticality of the column 120 erected in the underground hole H using the measurement unit 80 and target 90, as shown in Figure 4(a), the total station 20 installed at known point A starts measuring the three-dimensional position of the measurement point prism 30 installed on the measurement unit 80. Once the measurement starts, the survey data is processed by the total station controller 40 and the position information of the measurement unit 80 is input to the position management device 50.

[0039] When position information of the measurement unit 80 is input, the calculation processing unit 53 receives a command from the information acquisition unit 531 and stores this position information in the storage unit 54 as the position information of the measurement unit 80 before concrete pouring, associating it with the time. Alternatively, it may be output to a display device 60 such as a display via the output unit 52. As shown in the data table in Figure 6, the position information before concrete pouring is output in three-dimensional position coordinates (X, Y, Z).

[0040] ≪Target-side measurement process (acquisition of target's position information relative to the camera)≫ Furthermore, the position information of the target 90 relative to the camera 82 is continuously input from the measurement unit 80 to the position management device 50. Each time the position information of the target 90 is input, the calculation processing unit 53 receives a command from the information acquisition unit 431 and stores the position information of the target 90 in the storage unit 54, associating it with the time.

[0041] ≪Target Position Acquisition Process (Acquiring the target position relative to the reference markings before concrete pouring)≫ When the position information of the measurement unit 80 and the position information of the target 90 are input, the calculation processing unit 53 receives a command from the target position calculation unit 532 and calculates the position information of the target 90 relative to the reference line based on the position of known point A relative to the reference line (the installation position of the total station 20), the position information of the measurement unit 80 relative to the total station 20, and the position information of the target 90 relative to the camera 82 of the measurement unit 80 acquired at the same time, and stores it in the storage unit 54.

[0042] This allows the administrator to understand and precisely control the three-dimensional position of target 90 located within column 120 relative to the reference mark. At this point, the position information of target 90 relative to the reference mark is the position information of the pliers 200 (i.e., the top of column 120) when it is in the position and orientation specified in the design.

[0043] <<Starting stage of concrete pouring>> ≪Unit-side measurement process (position information of the measurement unit during concrete pouring: automatic measurement)≫ Next, when preparations begin for pouring concrete 112 into the underground hole H, as explained with reference to Figure 1(c), the workers input automatic measurement command information to the total station 20 via the total station controller 40. This initiates the automatic measurement of the three-dimensional position of the measurement unit 80 using the automatic tracking function.

[0044] In this state, as explained with reference to Figure 1(c), the work of pouring concrete 112 into the underground hole is started. As a result, during the concrete pouring period, the position information of the measurement unit 80 measured using the total station 20 is input to the position management device 50 continuously or intermittently. Each time position information of the measurement unit 80 is input, the calculation processing unit 53 receives a command from the information acquisition unit 531, associates it with the time, and stores it in the storage unit 54.

[0045] ≪Target Position Acquisition Process (Acquisition of target position relative to reference markings during concrete pouring)≫ Furthermore, each time the position information of the measurement unit 80 is input to the position management device 50, the calculation processing unit 53 receives a command from the target position calculation unit 532 and calculates the position information of the target 90 relative to the reference line based on the latest position information of the measurement unit 80 and the position information of the target 90 relative to the camera 82 of the measurement unit 80 acquired at the same time, and stores it in the storage unit 54. This makes it possible for the manager to grasp the three-dimensional position of the target 90 located inside the column 120 relative to the reference line and manage the accuracy even if the pliers 200 (i.e., the column 120) move within the underground hole H during the concrete pouring work, causing a positional shift.

[0046] ≪Displacement calculation process: STEP 3≫ Furthermore, upon receiving a command from the displacement calculation unit 533, the arithmetic processing unit 53 calculates the difference between the input position information of the measurement unit 80 and the position information of the measurement unit 80 stored in the storage unit 54 before concrete pouring, each time position information of the measurement unit 80 is input. The process of calculating the difference may be performed using installed, known application software. The difference is stored in the storage unit 54 as a displacement amount and is also output to a display device 60, such as a display, via the output unit 52. For example, as shown in the data table in Figure 6, the displacement amounts are output as X displacement amount, Y displacement amount, and Z displacement amount, respectively.

[0047] In this way, by calculating the displacement of the measurement unit 80 relative to its position before concrete pouring, it is possible to detect whether or not the camera 82 has shifted position relative to the position set before concrete pouring. Here, since the camera 82 (i.e., the measurement unit 80) is installed integrally with the pliers 200, the pliers 200 (i.e., the top of the column 120) will have shifted position and orientation relative to the position and orientation defined in the design within the underground hole H. Therefore, the plan view position or orientation is corrected using the following procedure.

[0048] ≪Displacement Amount Determination Process: STEP 4≫ When the displacement amounts (X displacement, Y displacement, Z displacement) relative to the position information of the measurement unit 80 before concrete placement are calculated, the calculation processing unit 53 receives a command from the displacement amount determination unit 534 and compares the displacement amounts with a preset threshold. If the threshold is exceeded, it outputs an alarm to, for example, the display device 60 via the output unit 52. The threshold is set with a margin of several millimeters relative to the management target value and is stored in the storage unit 54 in advance.

[0049] ≪Step 5: Adjusting the position of the pliers≫ When an alarm is triggered, the worker either interrupts the concrete pouring work 112 or continues the pouring work while adjusting the position of the pliers 200 (i.e., the top of the column 120) on which the measurement unit 80 is installed so as to satisfy the control tolerance.

[0050] For example, if either or both of the X and Y displacements exceed a predetermined threshold, it can be assumed that a shift occurs in the plan view position of the pliers 200 within the underground borehole H, and consequently, the camera 82 of the measurement unit 80 is misaligned relative to the reference mark. Therefore, the plan view position of the pliers 200 within the underground borehole H is corrected so that the X and Y displacements fall within the controllable limits.

[0051] Furthermore, if either the X displacement, the Y displacement, or both together, along with the Z displacement, exceeds a preset threshold, it can be assumed that the camera 82 of the measurement unit 80 is misaligned relative to the reference line due to the tilting position of the pliers 200 within the underground borehole H. Therefore, the position of the pliers 200 within the underground borehole H is corrected so that the X displacement and / or the Y displacement and Z displacement fall within the controllable limits.

[0052] Furthermore, if only the Z displacement exceeds a pre-set threshold, it can be assumed that the Yattoko 200 (i.e., the column 120) will float up or sink within the underground hole H, causing the camera 82 of the measurement unit 80 to be misaligned with the reference mark. Therefore, the height position of the Yattoko 200 within the underground hole H is adjusted so that the Z displacement falls within the controllable value.

[0053] Such positional adjustments can be made by any means, but for example, it is preferable to use the steel pipe fixing frame 220 described with reference to Figure 1(a). The steel pipe fixing frame 220 is positioned on the ground surface so as to surround the underground hole H and has the function of fixing and supporting the position of the pliers 200. In addition, if a lifting device such as a journal jack that extends and retracts in the vertical direction is installed, the height position of the top of the column 120 can be adjusted using this lifting device. Furthermore, if an extension device such as a hydraulic cylinder that extends and retracts in the horizontal direction is installed, the planar position of the pliers 200 can be adjusted using this extension device.

[0054] After performing the position correction work in this manner, the process returns to STEP 2 to acquire the position information of the measurement unit 80. Based on the acquired position information and the position information of the target 90 relative to the camera 82 of the measurement unit 80, which was acquired at the same time, the position information of the target 90 relative to the reference mark is calculated. This process is repeated until the concrete 112 pouring work is completed, at which point all work is finished.

[0055] According to the target position management method of the present invention, even if the pliers 200 (upper part of the column 120) to which the measuring unit 80 is attached deviates from the position and orientation specified in the design due to unforeseen circumstances such as contact with a tremie pipe used in concrete pouring work or uneven application of lateral pressure from the concrete 112, it is possible to acquire and manage the position information of the target 90 attached inside the column 120 relative to the reference mark, based on the position information of the measuring unit 80 relative to the reference mark and the position information of the target 90 relative to the camera 82 equipped on the measuring unit 80.

[0056] The target position management method of the present invention is not limited to the embodiments described above, and it goes without saying that various modifications are possible without departing from the spirit of the present invention.

[0057] For example, in this embodiment, a total station is used as the three-dimensional measuring device, but other surveying or measurement means may be used as long as they can continuously acquire the three-dimensional position of the measuring unit while automatically tracking it.

[0058] Furthermore, although this embodiment describes an example where the column 120 is made up of multiple connected steel pipes 131, it may also be made up of a single steel pipe 131. Also, although examples of using circular steel pipes for the steel pipes 131 constituting the column 120 and inserting the column 120 into an underground hole have been given, the embodiment is not limited to these. Square steel pipes or the like may be used for the steel pipes 131, and the column 120 may be inserted into an underground trench or a continuous underground wall. In addition, although the target 90 was attached to the internal diaphragm 132 provided on 1a of the steel pipe 13 to be measured, it may be attached to any position on the steel pipe 131a to be measured in any form, as long as it is in a position where imaging by the camera 22 is possible. [Explanation of Symbols]

[0059] 10 Location Management Systems 20. Total Station (3D measuring device) 30 measurement point prism 31 Holder 32 Prisms 40 Total Station Controller 50 Location management device 51 Input section 52 Output section 53. Arithmetic Processing Unit 531 Information Acquisition Department 532 Target position calculation unit 533 Displacement calculation unit 534 Displacement Amount Determination Unit 54 Storage section 60 Display device 70 Equipment mounting stand 80 measuring units 81 Storage Cases 82 Cameras 90 Targets 100 Reverse-mounted support posts 110 Pile body 111 Reinforcement cage 112 Concrete 120 Column 130 Column main body 131 Steel pipe 131a Steel pipe to be measured 132 Internal diaphragm 140 Fixing section 200 Pliers (columnar member) 201 Internal diaphragm 202 Fixing hardware 210 Telescopic device 220 Frame for fixing steel pipes A Known point Cv center axis H underground hole M standard black W Stabilizing Solution

Claims

1. A method for managing the position of a target installed inside a steel pipe column erected in an underground hole, A unit-side measurement process involves installing a three-dimensional measuring device at a known point where the coordinate values ​​set based on a reference mark are known, and using the three-dimensional measuring device to measure the three-dimensional position of a measuring unit equipped with a camera integrally attached to the upper part of the steel pipe column, and acquiring position information. A target-side measurement step, in which positional information of the target relative to the camera is acquired continuously or intermittently based on the image of the inside of the steel pipe column captured by the camera, A target position acquisition step that acquires the position information of the target relative to the reference mark based on the position of a known point relative to the reference mark, the position information of the measurement unit acquired in the unit-side measurement step, and the position information of the target acquired in the target-side measurement step at the same time, A method for managing the position of a target, characterized by comprising the following features.

2. In the target position management method described in claim 1, The unit-side measurement process is performed continuously or intermittently, and each time the position information of the measurement unit is acquired, the difference between that position information and the initial position information of the measurement unit is acquired as the displacement amount in a displacement amount calculation process. A displacement amount determination step that determines whether the amount of displacement exceeds a predetermined threshold, A method for managing the position of a target, characterized by comprising the following features.

3. In the target position management method described in claim 2, The displacement calculation step and the displacement determination step are performed during the operation of pouring concrete into the underground hole. A target position management method characterized by including a position correction step in which, if the displacement amount exceeds a predetermined threshold in the displacement amount determination step, the position of the steel pipe column relative to the underground hole is corrected.

Images