Earth retaining displacement measurement system and earth retaining displacement measurement method

Abstract

To provide an earth-retaining displacement measurement system capable of grasping a displacement amount of an earth-retaining material in the middle of excavation, while facilitating installation of a measurement device, and to provide an earth-retaining displacement measurement method.SOLUTION: An earth-retaining displacement measurement system which is applied to an earth-retaining wall construction site where, after inserting a plurality of earth-retaining materials long in the excavation direction in a contour position of a scheduled excavation site, the scheduled excavation site is excavated along the earth-retaining materials includes: a plurality of measurement devices 1 installed at a predetermined depth interval at the earth-retaining materials every time the scheduled excavation site is excavated to predetermined depth, and for measuring an inclination angle of the earth-retaining materials in the installation position and transmitting it wirelessly; and a monitoring device 5 for calculating the displacement amount of the earth-retaining materials in the installation position based on measurement data received from the plurality of measurement devices 1. The monitoring device 5 calculates the displacement amount of the earth-retaining materials in the installation position, based on the measurement data received from the plurality of measurement devices 1 even in the middle of excavation of the scheduled excavation site.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technology for forming earth retaining walls to carry out building construction and civil engineering work, and in particular to an earth retaining displacement measurement system for measuring the amount of displacement of earth retaining materials. [Background technology]

[0002] At construction sites for buildings and other structures, construction work typically involves inserting multiple long earth retaining materials along the excavation direction at the contours of the planned excavation site, then excavating the planned excavation site along the earth retaining materials to form an earth retaining wall that prevents soil from flowing into the planned excavation site. Earth retaining walls are also used at civil engineering sites when excavating slopes. Because earth pressure from the adjacent land acts on earth retaining walls, tilting or deformation of the earth retaining materials can compromise the safety of building construction and the functionality of the earth retaining wall. For this reason, it is important to understand the condition of the earth retaining wall by monitoring the tilt and deformation of the earth retaining materials.

[0003] A known method for monitoring the tilt and deformation of earth retaining materials is to insert a guide pipe equipped with an inclinometer into the contour of the planned excavation site and measure the tilt of the earth retaining material using the inclinometer. This method requires that the guide pipe be buried by boring or that the guide pipe be welded to the earth retaining material before burying and buried together with the material. In addition, the inclinometer is expensive and the wiring is complicated, so a lot of work and expense is required to monitor the tilt and deformation of the earth retaining material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-52467 Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, Patent Document 1 discloses a measurement system that can measure the inclination angle and horizontal displacement of earth retaining materials using a tape-type inclinometer in which multiple inclination angle detection units are connected continuously on a tape-shaped substrate, and an absolute position measurement unit that measures the absolute position of the head of the earth retaining wall. With this measurement system, the tape-type inclinometer is attached to the earth retaining material after excavation of the planned excavation site, making the installation of the inclinometer easier than when burying a guide pipe. However, although this type of measurement system makes it easy to install inclinometers, it has the problem that it is not possible to monitor the inclination or deformation of the retaining wall during excavation.

[0006] Therefore, the inventors have devised an earth retaining wall displacement measurement system that makes it easy to install measuring devices by fixing them to earth retaining walls at predetermined intervals, and that can grasp the amount of displacement of earth retaining walls not only during construction of a building, but also during excavation, based on the measurement data, thereby completing the present invention. In other words, the present invention aims to provide an earth retaining displacement measurement system and an earth retaining displacement measurement method that can grasp the amount of displacement of earth retaining materials during excavation while facilitating the installation of a measuring device. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the earth retaining displacement measurement system of the present invention is an earth retaining displacement measurement system that is applied to an earth retaining wall construction site where a plurality of earth retaining materials that are long in the excavation direction are inserted at contour positions of the planned excavation area, and then the planned excavation area is excavated along the earth retaining materials, and it comprises a plurality of measuring devices that are installed on the earth retaining materials at predetermined depth intervals each time the planned excavation area is excavated to a predetermined depth, and that measure the inclination angle of the earth retaining materials at the installation positions and transmit the results wirelessly, and a monitoring device that calculates the amount of displacement of the earth retaining materials at the installation positions based on the measurement data received from the plurality of measuring devices, and the monitoring device is configured to calculate the amount of displacement of the earth retaining materials at the installation positions based on the measurement data received from the plurality of measuring devices even during excavation of the planned excavation area.

[0008] It is also preferable that the earth retaining material displacement measurement system of the present invention be configured so that the monitoring device comprises an initial value setting unit that sets an initial value for the inclination angle of the measuring device when the measuring device is installed, an angle calculation unit that calculates the sum of the measurement value of the measuring device and the initial value, and a displacement amount calculation unit that calculates the amount of displacement of the earth retaining material at the installation position based on the sum.

[0009] It is also preferable that the retaining wall displacement measurement system of the present invention be configured so that, when the measuring device is installed, the initial value setting unit sets the total value of the measuring device located one step above the measuring device as the initial value of the inclination angle of the measuring device.

[0010] It is also preferable that the earth retaining wall displacement measurement system of the present invention be configured so that the displacement amount calculation unit calculates local displacement amounts, which are local displacement amounts of the earth retaining wall material at a plurality of the installation positions, and an integrated displacement amount, at each of the installation positions, which is the sum of the local displacement amount of that installation position and the local displacement amounts of all the installation positions below that installation position.

[0011] Furthermore, it is also preferable that the earth retaining wall displacement measurement system of the present invention be configured so that the displacement amount calculation unit sets the accumulated displacement amount obtained at the time of excavation completion as an initial value of the displacement amount, calculates the local displacement amount of the earth retaining wall material based on the measurement values ​​of the measuring device positioned one level lower at the installation positions of multiple measuring devices during the construction of the building or civil engineering work after excavation is completed, calculates an accumulated displacement amount at each installation position by accumulating the local displacement amount at that installation position and the local displacement amounts at all installation positions below that installation position, and adds the initial value of the displacement amount to this accumulated displacement amount to calculate the displacement amount at that installation position.

[0012] It is also preferable that the earth retaining displacement measurement system of the present invention be configured so that the measuring device measures the inclination angle of the earth retaining material using an accelerometer.

[0013] It is also preferable that the earth retaining displacement measurement system of the present invention be configured so that the measuring device transmits the inclination angle of the earth retaining material using a low-power wide area wireless communication line (LPWA (Low Power Wide Area)), a mobile phone line, or a short-range wireless communication communication line.

[0014] Furthermore, the earth retaining displacement measurement method of the present invention is a method for measuring earth retaining displacement that is applied to an earth retaining wall construction site, in which a plurality of earth retaining materials that are long in the excavation direction are inserted at contour positions of a planned excavation area, and then the planned excavation area is excavated along the earth retaining materials, and includes a measuring device installation step of installing measuring devices on the earth retaining materials at predetermined depth intervals each time the planned excavation area is excavated to a predetermined depth, measuring the inclination angle of the earth retaining materials at the installation positions and transmitting the results wirelessly, and a displacement amount calculation step of calculating the amount of displacement of the earth retaining materials at the installation positions based on measurement data received from the plurality of measuring devices, and the displacement amount calculation step is a method for calculating the amount of displacement of the earth retaining material at the installation positions based on measurement data received from the plurality of measuring devices even during excavation of the planned excavation area. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide an earth retaining displacement measurement system and an earth retaining displacement measurement method that can grasp the amount of displacement of earth retaining materials during excavation while facilitating the installation of a measuring device. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a block diagram showing the configuration of an earth retaining displacement measurement system according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a diagram showing a specific example of a communication line of the earth retaining displacement measurement system according to an embodiment of the present invention. [Figure 3] 1 is a block diagram showing the configuration of a measuring device included in an earth retaining displacement measuring system according to an embodiment of the present invention. FIG. [Figure 4] FIG. 10 is a diagram showing a specific example of the installation procedure of a measuring device included in an earth retaining displacement measurement system according to an embodiment of the present invention. [Figure 5]1 is a block diagram showing the configuration of a monitoring device included in an earth retaining displacement measurement system according to an embodiment of the present invention. FIG. [Figure 6] FIG. 10 is a diagram showing a specific example of the processing contents of the monitoring device when the first-stage measuring device of the earth retaining displacement measuring system according to an embodiment of the present invention is installed, and a specific example of the processing contents of the monitoring device when the second-stage measuring device is installed. [Figure 7] FIG. 10 is a diagram showing a specific example of the processing contents of the monitoring device when a third-stage measuring device of the earth retaining displacement measuring system according to an embodiment of the present invention is installed. [Figure 8] 1A and 1B are diagrams showing specific examples of the processing contents of the monitoring device when the first to fourth stage measuring devices of the earth retaining wall displacement measuring system according to an embodiment of the present invention are installed, where (a) is a table showing the processing contents, and (b) is a diagram showing the displacement state of the earth retaining wall. [Figure 9] 1A and 1B are diagrams showing specific examples of the processing contents of a monitoring device of an earth retaining displacement measurement system according to an embodiment of the present invention during construction of a building after excavation is completed, where (a) is a table showing the processing contents, and (b) is a diagram showing the displacement state of the earth retaining material. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments of the earth retaining displacement measurement system and earth retaining displacement measurement method of the present invention will be described in detail. However, the present invention is not limited to the specific contents of the following embodiments.

[0018] The earth retaining wall displacement measurement system of this embodiment is applied to an earth retaining wall construction site where multiple earth retaining materials that are long in the excavation direction are inserted at the contour positions of the planned excavation site, and then the planned excavation site is excavated along the earth retaining materials. Known earth retaining wall construction methods include the parent pile horizontal sheet pile method, in which long parent piles (H-shaped steel) are inserted at predetermined intervals in the excavation direction and then sheet piles are fitted between the parent piles while excavating, and the steel sheet pile method, in which long steel sheet piles are continuously inserted in the excavation direction. The earth retaining material in this embodiment corresponds to the parent piles in the parent pile horizontal sheet pile method, and to the steel sheet piles in the steel sheet pile method.

[0019] The earth retaining wall displacement measurement system of this embodiment comprises a plurality of measuring devices that are installed at predetermined depth intervals on the earth retaining wall material each time the planned excavation site is excavated to a predetermined depth, and that measure the inclination angle of the earth retaining wall material at the installation position and transmit the result wirelessly, and a monitoring device that calculates the amount of displacement of the earth retaining wall material at the installation position based on the measurement data received from the plurality of measuring devices, and is characterized in that the monitoring device calculates the amount of displacement of the earth retaining wall material at the installation position based on the measurement data received from the plurality of measuring devices even while excavation of the planned excavation site is in progress.

[0020] Specifically, as shown in Fig. 1, the earth retaining displacement measurement system of this embodiment includes a plurality of measuring devices 1, and a monitoring device 5 that can communicate with the measuring devices 1 via a first communication line 2, a base station cloud 3, and a second communication line 4. It is also preferable that the system further includes a user terminal 6 that can communicate with the monitoring device 5 via the second communication line 4.

[0021] The first communication line 2 includes a line for transmitting large amounts of data and a line for transmitting smaller amounts of data. Lines for transmitting large amounts of data include mobile phone lines such as 3G and LTE, and communication lines using short-range wireless communication methods such as Bluetooth (registered trademark), Wi-Fi (registered trademark), EnOcean (registered trademark), and ZigBee (registered trademark).

[0022] Lines for small-capacity data transmission include LPWA (Low Power Wide Area) such as SIGFOX (registered trademark), LoRa (registered trademark), NB-IoT, NB-Fi Protocol, GreenOFDM, DASH7, RPMA, Wi-SUN, and LTE-MTC. SIGFOX, an example of LPWA, has a long transmission distance of several tens of kilometers, an extremely slow transmission speed of 100 bps (upstream), and data size of 12 bytes (upstream), which is less than one-hundredth of the data size of Ethernet (registered trademark).

[0023] The second communication line 4 is a line for transmitting large amounts of data such as via the Internet. As shown in Fig. 2, the measurement device 1 communicates with a base station cloud 3 (such as the SIGFOX cloud) via a communication base station using LPWA (Low Power Wide Area) such as SIGFOX communication, or 3G, LTE, etc. At this time, the measurement device 1 can also transmit data via the above-mentioned mobile phone line or a communication line using a short-range wireless communication method. In addition, the monitoring device 5 communicates with the base station cloud 3 and a user terminal 6 via Internet communication, etc.

[0024] The user terminal 6 is a terminal used by a user of this system (e.g., a site supervisor), and may be, for example, a smartphone or PC (Personal Computer) that can communicate with the monitoring device 5 via a second communication line 4 such as the Internet using a dedicated app or a web browser.

[0025] The measuring device 1 is a so-called IoT device, which is attached to a measurement point and collects and transmits measurement data using a sensor. The measuring device 1 in this embodiment is installed at a plurality of installation positions (measurement points) of earth retaining materials at an earth retaining wall construction site, measures the inclination angle of the earth retaining material at each installation position, and transmits the measured value wirelessly. The installation procedure of the measuring device 1 will be described later.

[0026] Specifically, the measuring device 1 in this embodiment includes an inclination sensor 10, a measurement data memory unit 11, a setting parameter memory unit 12, a processing unit 13, a wireless communication unit 14, a power supply unit 15, and a timer unit 16, as shown in FIG. Although not shown, it is also preferable to configure the system further to include various other sensors and a storage unit that stores an event identification program that identifies the type of event (state of the measurement point) based on measurement data.

[0027] The tilt sensor 10 is a sensor that acquires the tilt angle of the measurement point, and can be a single-axis or multi-axis accelerometer that can detect minute changes in acceleration due to tilt fluctuations. Examples of multi-axis accelerometers that can be used include a three-axis accelerometer that measures acceleration in the X, Y, and Z directions, and a six-axis accelerometer that measures angular velocity in the X, Y, and Z directions in addition to these accelerations.

[0028] Other sensors that can be used include, for example, temperature sensors, acoustic sensors, temperature and humidity sensors, dust sensors, wind speed sensors, odor sensors, gas sensors, and light sensors, and the measuring device 1 can be configured to acquire and transmit measurement data from these sensors. Also, an event identification program can be used to identify the type of event based on the measurement data, and the identification results can be transmitted.

[0029] The measurement data memory unit 11 is a memory unit that stores the measurement data (sensor information) input from the tilt sensor 10 in chronological order, and can be configured using any storage device such as an HDD (Hard Disk Drive) or SSD (Solid State Drive). The measurement data storage unit 11 can also store sensor information input from various sensors, and can also store an event identification result indicating the result of identifying the type of event.

[0030] The setting parameter storage unit 12 is a storage unit that stores setting parameters that define the operation details of the measurement device 1, and can be configured from any storage device. In this embodiment, the setting parameters can include, for example, a transmission interval, an operation start time, an operation end time, etc. The transmission interval specifies the interval at which the measurement device 1 transmits measurement data, the operation start time specifies the time at which the measurement device 1 starts operating, and the operation end time specifies the time at which the measurement device 1 ends operating.

[0031] The processing unit 13 transmits the measurement data stored in the measurement data storage unit 11 to the monitoring device 5 via the wireless communication unit 14 and the first communication line 2. The processing unit 13 can also transmit the event identification result to the monitoring device 5. Furthermore, when the processing unit 13 receives setting change information from the monitoring device 5 via the first communication line 2 and the wireless communication unit 14, it can also perform processing to rewrite various setting parameters stored in the setting parameter storage unit 12 based on the setting change information.

[0032] The wireless communication unit 14 is a communication interface having an antenna and a chip on which an application for realizing communication with the first communication line 2 is implemented, and is connected to the first communication line 2 to transmit and receive data.

[0033] The power supply unit 15 supplies power to the measurement data storage unit 11, the setting parameter storage unit 12, the processing unit 13, the wireless communication unit 14, and the timer unit 16. For example, a lithium battery can be used as the power supply unit 15, but it may also be a combination of a battery and a power generation function that generates power from external energy, a piezoelectric element that converts vibrations of a structure into power, a heat conversion element that converts heat into power, a detachable dry cell battery, a solar cell, a dye-sensitized solar cell, etc. The power supply unit 15 is preferably a stand-alone power source that does not require wiring or charging.

[0034] The timer section 16 has a timekeeping function, and can be set to any predetermined time or period, and outputs a control signal to the processing section 13 when the set value is reached.

[0035] The measuring device 1 is installed, for example, according to the procedure shown in Fig. 4. As shown in the figure, in earth retaining wall construction, a plurality of long earth retaining materials D are inserted in the excavation direction at the contour positions of the planned excavation area, and then the planned excavation area is excavated along the earth retaining materials D. At this time, the measuring devices 1 are installed on the earth retaining materials D at predetermined depth intervals L (for example, 2 m) each time the planned excavation area is excavated to a predetermined depth. Fig. 4 shows a first level of measuring device 1 installed on the earth retaining materials D before excavation, and second to fourth levels of measuring devices 1 installed on the earth retaining materials D each time the planned excavation area is excavated to a predetermined depth. Note that the intervals L at which the measuring devices 1 are installed do not necessarily have to be constant.

[0036] It is preferable to install the measuring device 1 on multiple earth retaining materials D. For example, when constructing earth retaining walls on four sides, it is preferable to install multiple measuring devices 1 on each earth retaining material D on each side to measure the amount of displacement of the earth retaining material D and monitor the earth retaining walls on the four sides. Also, while Fig. 4 shows a construction method in which struts K are installed between opposing earth retaining materials D, the presence or absence of struts K is optional.

[0037] Next, the installation procedure of the measuring device 1 shown in FIG. 4 will be described in detail. First, in 1 of Figure 4, the first stage of measuring device 1 is installed on earth retaining material D (1). Next, in 2 of Figure 4, excavation is carried out at a predetermined depth interval L (2), and the second stage of measuring device 1 is installed on earth retaining material D (3). Next, in 3 of Figure 4, the first strut K is installed (4), excavation is carried out at a predetermined depth interval L (5), the second strut K is installed (6), and the third measuring device 1 is installed on the retaining material D (7). Note that the steps of (6) and (7) may be reversed. Furthermore, in step 4 of Figure 4, excavation is carried out at a predetermined depth interval L (8), the third strut K is installed (9), and the fourth measuring device 1 is installed on the retaining wall D (10). Note that the steps of (9) and (10) may be reversed.

[0038] The monitoring device 5 is a computer that calculates the amount of displacement (horizontal displacement) of the earth retaining material D at the installation position of the measuring device 1 based on measurement data transmitted from multiple measuring devices 1. In addition, in response to a request from the user terminal 6, the monitoring device 5 provides information such as the amount of displacement of the earth retaining material D at the installation position of the measuring device 1 (for example, FIG. 8(a)), displacement history information (for example, FIG. 8(b)), and changes the setting parameters of each measuring device 1.

[0039] As shown in FIG. 5, the monitoring device 5 includes a storage unit 50, a data processing unit 51, a user processing unit 52, and a communication unit 53. The communication unit 53 is a communication interface having a chip on which an application for realizing communication with the second communication line 4 is implemented.

[0040] The memory unit 50 is a memory unit that stores measurement data transmitted from the measurement device 1 and calculation data calculated by the data processing unit 51 based on the measurement data, and can be configured using a storage device such as an HDD (Hard Disk Drive) or SSD (Solid State Drive). The storage unit 50 of this embodiment includes a measurement data storage unit 50a, a calculation data storage unit 50b, a measurement position information storage unit 50c, and a setting parameter storage unit 50d.

[0041] The measurement data storage unit 50a stores the measurement data transmitted from the plurality of measuring devices 1 in chronological order for each earth retaining material D, in association with the plurality of measuring devices 1 or their installation positions. The calculated data storage unit 50b stores the calculated data calculated by the data processing unit 51 at a predetermined timing based on the measurement data transmitted from the plurality of measurement devices 1. The measurement position information storage unit 50c stores position information for identifying the installation position of each measurement device 1. The setting parameter storage unit 50d stores the current setting parameters of each measurement device 1.

[0042] The data processing unit 51 associates the measurement data transmitted from the multiple measuring devices 1 with the multiple measuring devices 1 or their positions, and stores the data in the measurement data storage unit 50a in chronological order for each earth retaining material D. The data processing unit 51 also stores calculated data calculated at a predetermined timing based on the measurement data transmitted from the multiple measuring devices 1 in the calculation data storage unit 50b.

[0043] Specifically, the data processing unit 51 has a functional configuration realized by cooperation between hardware and software, including an initial value setting unit 51a that sets an initial value (initial angle value) for the tilt angle of the measuring device 1 when the measuring device 1 is installed, an angle calculation unit 51b that calculates the sum (calculated angle) of the measurement value (display angle) of the measuring device 1 and the initial angle value, and a displacement amount calculation unit 51c that calculates the amount of displacement (local displacement amount, cumulative displacement amount) of the earth retaining material D at the installation position of the measuring device 1 based on the calculated angle calculated by the angle calculation unit 51b. Note that these displacement amounts are horizontal displacement amounts based on the tilt of the earth retaining material D and do not include horizontal displacement amounts based on the horizontal movement of the earth retaining material D.

[0044] The initial value setting unit 51a sets initial values ​​for the measuring device 1 when the measuring device 1 is installed during the excavation process of the planned excavation site, and stores these in the calculated data storage unit 50b in association with the measuring device 1 or its installation location. For example, as shown in Figures 6 to 8, when installing a measuring device 1 on the first stage or when installing a measuring device 1 on the final stage, the initial value of that measuring device 1 is set to 0°, but when installing a measuring device 1 on the second stage or higher and above the final stage, the calculated angle of the measuring device 1 located one stage above that measuring device 1 is set as the initial value of that measuring device 1.

[0045] In this way, when installing the measuring device 1, the angle change of the earth retaining material D at the installation position of the measuring device 1 can be grasped by taking into account the angle change that has already occurred in the earth retaining material D, and it becomes possible to calculate the local displacement amount (horizontal displacement amount) based on the inclination of the earth retaining material D with respect to the vertical direction at the installation position of the measuring device 1 during excavation.

[0046] The angle calculation unit 51b calculates the calculated angle, which is the change in angle of the retaining wall material D relative to the vertical direction at the installation positions of multiple measuring devices 1, by adding up the measurement values ​​(display angles) of the measuring devices 1 and the initial angle values.

[0047] The displacement amount calculation unit 51c calculates a local displacement amount, which is the local displacement amount of the retaining wall material D at the installation positions of multiple measuring devices 1, and an integrated displacement amount, which is the sum of the local displacement amount at the installation position of each measuring device 1 and the local displacement amounts at all installation positions below that installation position. Furthermore, the displacement amount calculation unit 51c stores the integrated displacement amount obtained at the time of completion of excavation in the calculation data storage unit 50b as the initial displacement value.

[0048] Furthermore, the displacement calculation unit 51c calculates the actual displacement amount, which is the actual displacement amount at the installation position of each measuring device 1, by adding the initial displacement value to the accumulated displacement amount at the installation positions of multiple measuring devices 1 during the construction of a building or civil engineering work after excavation is completed. At this time, the displacement amount calculation unit 51c calculates the local displacement amount of each measuring device 1 based on the display angle (measured value) of the measuring device 1 placed one step below the measuring device 1. Then, at the installation position of each measuring device 1, it calculates an integrated displacement amount by integrating the local displacement amount of the installation position and the local displacement amounts of all installation positions below the installation position.

[0049] Specifically, as shown in Figures 6 to 8, each time a measuring device 1 is installed, the local displacement amount and cumulative displacement amount of earth retaining material D at the installation position above the measuring device 1 are updated as follows: In Figure 8, MD represents the measuring device, and Figure 8(b) is an image diagram clearly showing the displacement state of earth retaining material D. That is, the measurement value (display angle) of the nth measuring device 1 is M n (°), the initial angle is P n (°), the calculated angle C n (°) and the initial angle P n+1 (°) is set as follows: C n =M n +P n P n+1 =C n

[0050] In addition, the distance from the nth measuring device 1 to the measuring device 1 one step below is Ln (mm), the local displacement H n (mm) and cumulative displacement S n (mm) is calculated as follows: H n =L n ×sinC n S n =H n (H n+1 +···)

[0051] During the excavation process, the calculated angle for the measuring device 1 when it is installed on the ground surface and when it is installed at the bottom of each excavation is set to 0° because there is no local displacement yet. Also, when it is installed at the bottom, the measuring device 1 is not yet tilted, so the initial angle value is set to 0°.

[0052] For example, as shown in Figures 6 and 8, when the second-stage measuring device 1 is installed, if the measurement value M1 of the first-stage measuring device 1 is 0.2°, the calculated angle C1 (= M1 + P1) is 0.2° (= 0.2 + 0). In this case, the initial angle value P2 (= C1) of the second-stage measuring device 1 is set to 0.2°. Furthermore, the local displacement amount at the installation position of the first stage and the integrated displacement amount at the installation position of the first stage at the time of installation of the second stage are calculated using the following formulas, where the installation interval L of the measuring devices 1 is 2000 mm. First stage local displacement H1 = 2000 × sin0.2° = 6.98 mm First stage cumulative displacement S1 = 6.98 + 0.00 = 6.98 mm

[0053] 7 and 8, when the third-stage measuring device 1 is installed, if the measurement value M1 of the first-stage measuring device 1 is -0.1°, the calculated angle C1 (= M1 + P1) is -0.1° (= -0.1 + 0). If the measurement value M2 of the second-stage measuring device 1 is -0.15°, the calculated angle C2 (= M2 + P2) is 0.05° (= -0.15 + 0.2). In this case, the initial angle value P3 (= C2) of the third-stage measuring device 1 is set to 0.05°. In addition, the local displacement amount of the first stage installation position, the local displacement amount of the second stage installation position, the accumulated displacement amount of the first stage installation position, and the accumulated displacement amount of the second stage installation position at the time of installing the third stage are calculated using the following formulas. First stage local displacement H1 = 2000 × sin-0.1° = -3.49 mm Second stage local displacement H2 = 2000 × sin0.05° = 1.75 mm First stage cumulative displacement S1 = -3.49 + 1.75 + 0.00 = -1.74 mm Second stage cumulative displacement S2 = 1.75 + 0.00 = 1.75 mm

[0054] Thereafter, by repeating the same process, the local displacement amount at the first tier installation position, the local displacement amount at the second tier installation position, the local displacement amount at the third tier installation position, the integrated displacement amount at the first tier installation position, the integrated displacement amount at the second tier installation position, and the integrated displacement amount at the third tier installation position are calculated at the time of installing the fourth tier, as shown in Fig. 8. The same applies when the number of installation tiers of the measurement device 1 is further increased.

[0055] According to such a displacement calculation unit 51c, even during excavation of the planned excavation site, it is possible to calculate the local displacement amount and cumulative displacement amount of the retaining wall D at the installation positions of multiple measuring devices 1, making it possible to monitor the displacement status of the retaining wall.

[0056] 9, the displacement amount calculation unit 51c of this embodiment calculates an actual displacement amount, which is the actual displacement amount based on the inclination of the earth retaining material D at the installation positions of the plurality of measuring devices 1, after the excavation of the planned excavation site is completed (during the construction of the building or civil engineering work), based on the measurement data of the plurality of measuring devices 1. In FIG. 9, MD represents a measuring device, and the broken solid line in FIG. 9(b) represents the actual displacement of the earth retaining material D, and the dashed line represents the accumulated displacement, and these are image diagrams that show these in extreme terms. The actual displacement amount is calculated by adding the initial displacement value to the integrated displacement amount at the installation positions of the plurality of measuring devices 1.

[0057] Specifically, as shown in Figs. 8 and 9, the integrated displacement at the time of completion of excavation is used as the initial displacement value of each measuring device 1, and the actual displacement amount A during the construction of the building is n is the cumulative displacement S n (mm), the initial displacement value Q n (mm), it is calculated as follows: A n =S n +Q n

[0058] In addition, the local displacement amount H after excavation is completed n is calculated as follows using the measured value of the measuring device 1 arranged one step below, and the integrated displacement amount and actual displacement amount are calculated using this local displacement amount. H n =L n ×sinM n+1

[0059] According to such a displacement calculation unit 51c, the actual displacement of the retaining wall D at the installation positions of multiple measuring devices 1 can be calculated during the construction of a building or civil engineering work after excavation is completed, making it possible to monitor the displacement status of the retaining wall.

[0060] In response to a request from the user terminal 6, the user processing unit 52 transmits to the user terminal 6 screen data for displaying displacement during excavation, screen data for displaying displacement during construction, and the like. For example, displacement display screen data during excavation can be created based on the contents of FIG. 8, and displacement display screen data after excavation is completed can be created based on the contents of FIG.

[0061] As described above, the earth retaining wall displacement measurement system and earth retaining wall displacement measurement method according to the embodiment of the present invention make it possible to easily install the measuring device 1 and to grasp the amount of displacement of the earth retaining wall material D not only during construction of a building, but also during excavation.

[0062] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the scope of the present invention. For example, by equipping the measuring device with other sensors such as a vibration sensor or sound sensor, it is possible to appropriately modify the device so that it is possible to grasp not only the displacement of the retaining wall material but also the vibrations and noise at the retaining wall construction site. [Industrial Applicability]

[0063] The present invention can be suitably used at earth retaining wall construction sites where the condition of the earth retaining wall is grasped to ensure the safety of building construction and civil engineering work. [Explanation of symbols]

[0064] 1. Measuring equipment 10 Tilt sensor 11 Measurement data storage unit 12 Setting parameter memory section 13 Processing section 14. Radio Communication Section 15 Power supply section 16 Timer section 2. First communication line 3 Base station cloud 4 Second communication line 5 Monitoring device 50 Storage section 50a Measurement data storage unit 50b Calculation data storage unit 50c Measurement position information storage section 50d Setting parameter memory section 51 Data processing section 51a Initial value setting section 51b Angle calculation section 51c Displacement calculation section 52 User processing section 53 Communications Department 6 User terminals

Claims

1. A retaining wall displacement measurement system applied to an earth retaining wall construction site, in which a plurality of retaining materials long in the excavation direction are inserted at the contour positions of the planned excavation site, and then the planned excavation site is excavated along the retaining materials, a plurality of measuring devices that are installed at predetermined depth intervals on the earth retaining material each time the planned excavation site is excavated to a predetermined depth, and that measure the inclination angle of the earth retaining material at the installation position and transmit the result wirelessly; a monitoring device that calculates the amount of displacement of the retaining wall material at the installation position based on measurement data received from the plurality of measuring devices, The monitoring device calculates the displacement of the retaining material at the installation position based on the measurement data received from the plurality of measuring devices even during excavation of the planned excavation site, The monitoring device an initial value setting unit that sets an initial value of the tilt angle of the measuring device when the measuring device is installed; an angle calculation unit that calculates a sum of the measurement value of the measuring device and the initial value; a displacement amount calculation unit that calculates a displacement amount of the retaining wall material at the installation position based on the summed value, the initial value setting unit, when installing the measuring device, sets the initial value of the measuring device to 0° when installing the measuring device on the first stage and when installing the measuring device on the final stage, and when installing the measuring device on the second stage or later and above the final stage, sets the total value of the measuring device arranged one stage above the measuring device as the initial value of the tilt angle of the measuring device; The displacement amount calculation unit calculates local displacement amounts that are local displacement amounts of the earth retaining material at the plurality of installation positions, and an integrated displacement amount that is an integrated sum of the local displacement amount of the installation position and the local displacement amounts of all the installation positions below the installation position, at each installation position. A retaining wall displacement measurement system.

2. The displacement amount calculation unit The integrated displacement amount obtained at the time of completion of excavation is set as the initial value of the displacement amount, During the construction of the building or civil engineering work after the excavation is completed, at the installation positions of the plurality of measuring devices, the local displacement amount of the earth retaining material is calculated based on the measurement value of the measuring device arranged one level below, and at each of the installation positions, an integrated displacement amount is calculated by integrating the local displacement amount of the installation position and the local displacement amounts of all the installation positions below the installation position, and the initial value of the displacement amount is added to this integrated displacement amount to calculate the displacement amount at the installation position.

2. The earth retaining displacement measurement system according to claim 1.

3. The earth retaining wall displacement measurement system according to claim 1 or 2, characterized in that the measuring device measures the inclination angle of the earth retaining wall using an accelerometer.

4. A retaining wall displacement measurement system as described in any one of claims 1 to 3, characterized in that the measuring device transmits the inclination angle of the retaining wall material using a low-power wide-area wireless communication line (LPWA (Low Power Wide Area)), a mobile phone line, or a short-range wireless communication line.

5. A method for measuring displacement of an earth retaining wall applied to an earth retaining wall construction site, in which a plurality of earth retaining materials long in the excavation direction are inserted at the contour positions of a planned excavation site, and then the planned excavation site is excavated along the earth retaining materials, a measuring device installation process in which measuring devices are installed at predetermined depth intervals on the earth retaining material each time the planned excavation site is excavated to a predetermined depth, and the inclination angle of the earth retaining material at the installation position is measured and transmitted wirelessly; a displacement amount calculation step of calculating a displacement amount of the earth retaining material at the installation position based on measurement data received from the plurality of measuring devices, In the measuring device installation step, when installing the measuring device, when installing the measuring device on the first stage and when installing the measuring device on the final stage, the initial value of the measuring device is set to 0°, and when installing the measuring device on the second stage or later and above the final stage, the total value of the measuring device arranged one stage above the measuring device is set as the initial value of the tilt angle of the measuring device, In the displacement amount calculation step, even during excavation of the planned excavation site, the displacement amount of the earth retaining material at the installation position is calculated based on the measurement data received from the plurality of measurement devices, and a local displacement amount that is a local displacement amount of the earth retaining material at the plurality of installation positions and an integrated displacement amount that is an integrated sum of the local displacement amount of the installation position and the local displacement amounts of all the installation positions below the installation position are calculated. A method for measuring earth retaining displacement.

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