JP6793404B2 - Displacement measuring device for wastewater treatment pit, soil mass movement monitoring device and wastewater treatment pit monitoring device - Google Patents

Description

The present invention relates to a displacement measuring device for a wastewater treatment pit , a soil mass movement monitoring device, and a wastewater treatment pit monitoring device .

In areas where landslides are likely to occur, wastewater treatment pits are installed for the purpose of collecting and discharging groundwater that causes landslides.

Specifically, this wastewater treatment tunnel is connected to the bottom wall surface portion provided with a water flow groove portion in the length direction, the left and right wall surface portions erected on the left and right sides of the bottom wall surface portion, and the left and right wall surface portions. It is a tunnel structure (commonly known as a drainage tunnel) having a bottom wall surface and a top wall surface facing each other, and a main line portion provided over several km in the target area and a branch line portion branched from this main line portion. It is generally composed of. In addition, a water collecting part (boring chamber) is provided at the tip of this branch line part, and a plurality of water collecting pipes are projected in the radial direction from the peripheral surface of the water collecting part, and this water collecting pipe is investigated in advance. By arranging it in the part where the groundwater is likely to collect, the groundwater is collected in the water collecting part through each water collecting pipe, and the groundwater collected in this water collecting part is transferred from the branch line part to the main line part. It flows and is led out to the drainage channel provided at the end of this wastewater treatment pile. This drainage channel extends to the river, for example, and the groundwater collected in the wastewater treatment pit is finally discharged to the river. In addition, as this wastewater treatment pit, there is also a catchment pit consisting of a vertical shaft.

By the way, in the above-mentioned wastewater treatment pit, strain displacement may occur due to strong stress due to the movement (ground slip) of the soil mass in which the wastewater treatment pit is provided, but the confirmation of strain displacement in this wastewater treatment pit is exclusively for that purpose. At present, it is carried out visually by engineers who are familiar with the area and structures (wastewater treatment pits). Therefore, if a damaged part is found, the damaged part must be repaired, and if the damaged part cannot be repaired, the wastewater treatment pit must be filled as an abandoned mine and another wastewater treatment pit must be constructed. It costs a lot of money.

Therefore, it is desirable to grasp the strain displacement of the wastewater treatment pit in advance and take measures such as reinforcement before the strain displacement occurs in the wastewater treatment pit and damage it. Therefore, maintenance that enables the extension of the life of the wastewater treatment pit is possible. Management is needed.

Therefore, the applicant proposes a displacement measuring device for a wastewater treatment pit disclosed in Japanese Patent No. 6289422.

Japanese Patent No. 6289422

The present inventors have further researched and developed the above-mentioned displacement measuring device for wastewater treatment pits, and have developed a more practical displacement measuring device for wastewater treatment pits , a mass movement monitoring device, and a wastewater treatment pit monitoring device .

The gist of the present invention will be described with reference to the accompanying drawings.

A displacement measurement apparatus of the wastewater treatment pit 21 provided in the ground, the waste water treatment first reference portion position P1 or we second to the reference site P2 on the measuring wire position diametrically opposite the bore 21 in the wall a first distance measuring unit 1 for measuring a distance between the provided L1 on erection state the said first reference part P1 second reference portion P2, and the measuring wire L1 of the first distance measuring unit 1 the measured measuring wire L2 which Ru is arranged in a state having a length in a direction crossing the up fourth reference position P4 at a position opposing to the third reference portion position P3 or et diametrical direction of the wastewater treatment pit 21 in wall A second distance measuring unit 2 for measuring the distance between the third reference portion P3 and the fourth reference portion P4 by providing the wire rod L2 in an erected state, the first distance measuring unit 1 and the second distance. have a data recording unit 7 for recording the data measured in the measurement unit 2, the first distance measuring unit 1 and the second distance measuring unit 2, the measuring wire to be installed between said each reference part It is a telescopic meter that measures the amount of distance displacement between each reference part by the displacement of L1 and L2, and the base end of the measuring wire L1 of the first distance measuring unit 1 is the first distance measuring unit 1. The length-adjustable tubular member 4 that is abutted and whose tip is abutted against the second reference portion P2 is housed, and the base end of the measuring wire L2 of the second distance measuring unit 2 is the second distance. The present invention relates to a displacement measuring device for a wastewater treatment pit, which is housed in a length-adjustable tubular member 4 which is in contact with the measuring unit 2 and whose tip is in contact with the third reference portion P3. is there.

Further, the displacement measuring device for the wastewater treatment pit according to claim 1, wherein a reflective material is provided on the peripheral surface of the tubular member 4.

Further, in the displacement measuring device for the wastewater treatment pit according to any one of claims 1 and 2 , the tubular member 4 relates to the displacement measuring device for the wastewater treatment pit, which is characterized by being a vinyl chloride pipe. ..

Further, in the displacement measuring device for the wastewater treatment pit according to any one of claims 1 to 3 , the wastewater treatment pit 21 has a bottom wall surface portion 21A provided with a water flow groove portion 21a in the length direction and the bottom wall surface portion 21A. A tunnel provided with a left wall surface portion 21B and a right wall surface portion 21C standing on the left and right sides of the 21A, and a top wall surface portion 21D connected to the left wall surface portion 21B and the right wall surface portion 21C and facing the bottom wall surface portion 21A. It relates to a displacement measuring device for a wastewater treatment tunnel, which is characterized by having a structure.

Further, in the displacement measuring device for the wastewater treatment pit according to claim 4 , the first reference portion P1 is set as one of the left wall surface portion 21B and the right wall surface portion 21C, and the second reference portion P2 is used. As the other predetermined portion of the left wall surface portion 21B and the right wall surface portion 21C, the measurement wire rod L1 is erected horizontally between the first reference portion P1 and the second reference portion P2. On the other hand, the third reference portion P3 is used as a predetermined portion of the bottom wall surface portion 21A, and the fourth reference portion P4 is used as a predetermined portion of the top wall surface portion 21D, and the third reference portion P3 and the fourth reference portion P3 are used. The present invention relates to a displacement measuring device for a wastewater treatment pit, which is configured such that the measuring wire L2 is erected vertically between the reference portion P4 and the reference portion P4.

Further, the displacement measuring device for the wastewater treatment pit according to any one of claims 4 and 5 is provided with an inclination measuring unit 5 for measuring the inclination of the bottom wall surface portion 21A in the longitudinal direction and the transverse direction. It is related to the displacement measuring device of the wastewater treatment pit.

Further, in the displacement measuring device for the wastewater treatment pit according to any one of claims 1 to 6 , the displacement amount for calculating the displacement amount of the wastewater treatment pit 21 based on the data recorded by the data recording unit 7. It relates to a displacement measuring device for a wastewater treatment pit, which is characterized by having a calculation unit.

Further, in the displacement measuring device for the wastewater treatment pit according to any one of claims 1 to 7, the measuring wire rod L1 extending from the first distance measuring unit 1 and extending from the second distance measuring unit 2. The measurement wire L2 to be provided relates to a displacement measuring device for a wastewater treatment pit, which is provided in a state of being substantially orthogonal to each other.

Further, the wastewater treatment is performed based on the displacement measuring device according to any one of claims 1 to 8 for measuring the strain displacement of the wastewater treatment pit 21 provided in the ground and the data measured by the displacement measuring device. A displacement amount calculation unit that calculates the displacement amount of the pit 21, and a soil mass movement amount confirmation means that confirms the past movement amount of the soil mass in which the wastewater treatment pit 21 is provided by the displacement amount calculated by the displacement amount calculation unit. It relates to a soil mass movement monitoring device characterized by being composed of.

Further, in the soil mass movement monitoring device according to claim 9, the future displacement amount of the wastewater treatment pit 21 is predicted based on the displacement amount of the wastewater treatment pit 21 calculated by the displacement amount calculation unit, and the wastewater treatment is performed. The present invention relates to a soil mass movement monitoring device characterized by having a soil mass movement amount predicting means for predicting the future movement amount of the soil mass provided with the pit 21.

Further, in the soil mass movement monitoring device according to claim 10 , a plurality of the wastewater treatment pits 21 are provided in the ground, and the soil mass movement amount predicting means is provided with the plurality of wastewater treatment pits 21. The present invention relates to a soil mass movement monitoring device , which is a means for predicting the future movement amount of a soil mass in a predetermined area.

Further, the wastewater treatment is performed based on the displacement measuring device according to any one of claims 1 to 8 for measuring the strain displacement of the wastewater treatment pit 21 provided in the ground and the data measured by the displacement measuring device. It is composed of a displacement amount calculation unit that calculates the displacement amount of the mine 21 and a mine condition confirmation means that confirms the time of repair or abandonment of the wastewater treatment mine 21 by the displacement amount calculated by the displacement amount calculation unit. It relates to a wastewater treatment pit monitoring device characterized by.

Since the present invention is configured as described above, the state (strain displacement) of the wastewater treatment pit can be easily and surely grasped, high-precision measurement can be performed at low cost, and the existing one can be used. Displacement measurement of a practical wastewater treatment pit that exerts unprecedented effects such as being able to monitor the movement of soil mass (whether or not landslide activity is active) using the structure (wastewater treatment pit) of It will be a device , a mass movement monitoring device, and a wastewater treatment pit monitoring device .

It is a usage state explanatory drawing of this Example. It is a usage state explanatory drawing of this Example. It is a perspective view explaining the main part of this Example. It is explanatory drawing of the main part of this Example. It is explanatory drawing of the wastewater treatment pit 21.

An embodiment of the present invention that is considered to be suitable will be briefly described by showing the operation of the present invention based on the drawings.

The first distance measuring unit 1 erected the measuring wire L1 between the first reference portion P1 on the inner wall surface of the wastewater treatment pit 21 and the second reference portion P2 facing the first reference portion P1 in the radial direction. The distance between the first reference portion P1 and the second reference portion P2 is measured, and the second distance measuring unit 2 has a length in the direction intersecting the measuring wire L1 of the first distance measuring unit 1. Arranged in a state, a measuring wire L2 is erected between the third reference portion P3 on the inner wall surface of the wastewater treatment pit 21 and the fourth reference portion P4 facing the third reference portion P3 in the radial direction. The distance between the reference site P3 and the fourth reference site P4 is measured.

The data measured by the first distance measuring unit 1 and the second distance measuring unit 2 is recorded by the data recording unit 7. The data of the data recording unit 7 is processed by, for example, a computer to calculate the displacement amount of the wastewater treatment pit 21.

From this calculated displacement amount, the state (strain displacement) of the wastewater treatment pit 21 can be surely grasped, and the repair time and the abandoned mine time of the wastewater treatment pit 21 can be confirmed.

Further, the displacement amount of the wastewater treatment pit 21 can confirm the amount of movement of the soil mass in which the wastewater treatment pit 21 is provided so far, and further, based on the displacement amount of the wastewater treatment pit 21, the wastewater treatment pit 21 It is possible to predict the amount of displacement in the future and the amount of movement of the soil mass in which the flat water treatment pit 21 is provided.

Therefore, by quantifying the state (strain displacement) of the wastewater treatment pit 21 due to the movement of the soil mass (for example, landslide) as the displacement, it is possible to easily and surely confirm the state of the wastewater treatment pit 21 even if the person is not an expert. If an abnormality is confirmed, it can be dealt with immediately and the movement of the soil mass (whether or not the landslide activity is active) can be monitored.

Further, since the displacement measuring device of the present invention uses wire rods instead of laser light, it is not easily affected by changes in weather conditions, for example, and can measure with high accuracy (laser light is condensed water). The accuracy may drop due to the reflectance due to the influence of dust and fog), and since the device itself is inexpensive, it can be measured at low cost.

Specific examples of the present invention will be described with reference to the drawings.

This embodiment is a displacement measuring device for a wastewater treatment pit 21 provided in the ground, and is a first reference portion P1 on the inner wall surface of the wastewater treatment pit 21 and a second reference portion P1 facing the first reference portion P1 in the radial direction. (Ii) A first distance measuring unit 1 that installs a measuring wire L1 between the reference part P2 and measures the distance between the first reference part P1 and the second reference part P2, and the first distance measurement. A fourth reference portion P3 on the inner wall surface of the wastewater treatment pit 21 and a fourth reference portion P3 facing the third reference portion P3 in the radial direction, which is arranged in a state having a length in a direction intersecting the measurement wire rod L1 of the portion 1. A second distance measuring unit 2 for arranging a measuring wire L2 between the reference portion P4 and measuring the distance between the third reference portion P3 and the fourth reference portion P4, and the first distance measuring unit. It has a data recording unit 7 for recording the data measured by the first distance measuring unit 2 and the second distance measuring unit 2.

In this embodiment, as the wastewater treatment pit 21 to be measured, as shown in FIGS. 1, 2 and 5, a bottom wall surface portion 21A provided with a water flow groove portion 21a in the length direction and left and right of the bottom wall surface portion 21A. A drainage tunnel (horizontal resistance) having a left wall surface portion 21B and a right wall surface portion 21C to be erected, and a top wall surface portion 21D connected to the left wall surface portion 21B and the right wall surface portion 21C and facing the bottom wall surface portion 21A. The wastewater treatment pit 21 according to this embodiment is composed of a main line portion 21'and a branch line portion 21 "branched from the main line portion 21'. A water collecting part 22 (boring chamber) is provided at the tip of the water collecting part 22, and a plurality of water collecting pipes 23 are projected in the radial direction from the peripheral surface of the water collecting part 22, and the water collecting pipes 23 are investigated in advance. By arranging the groundwater in a part where the groundwater is likely to collect, the groundwater is collected in the water collecting part 22 through each of the collecting pipes 23, and the groundwater collected in the water collecting part 22 is the branch line part 21. It flows from "to the main line 21'and is led out to the drainage channel 24 provided at the end of the wastewater treatment pile 21. This drainage channel 24 extends to, for example, a river 25 and is collected at the wastewater treatment pit 21. The groundwater will eventually be discharged into the river. The wastewater treatment pit 21 may be a vertical shaft, and any structure exhibiting the characteristics of the present embodiment can be appropriately adopted.

Hereinafter, each component of the present embodiment will be described in detail.

The first distance measuring unit 1 and the second distance measuring unit 2 measure the amount of distance displacement between the reference parts by the displacement of the measuring wires L1 and L2 (Invar wire) erected between the reference parts. In this embodiment, a simple extensometer "GSL-050" manufactured by Geotech Service Co., Ltd. is adopted, and as shown in FIG. 3, it can be rotated in the device main bodies 1a and 2a. The distance is measured by expanding and contracting (pulling out and winding) the measuring wires L1 and L2 made of wires wound around the stored drums 1b and 2b.

In this embodiment, as shown in FIGS. 1 and 2, a first distance measuring unit 1 is provided at a first reference portion P1 as a predetermined portion of the left wall surface portion 21B of the wastewater treatment pit 21, and the first distance measuring unit 1 is provided. The measurement wire L1 is pulled out from the water treatment shaft L1 in the horizontal direction, and the tip of the measurement wire L1 is set as a predetermined part on the right wall surface 21C of the water treatment pit 21 so that the measurement wire L1 is erected in a horizontal state. It is connected and fixed to P2, while a second distance measuring unit 2 is provided at a fourth reference portion P4 as a predetermined portion of the top wall portion 21D of the wastewater treatment pit 21, and the measuring wire L2 is connected from the second distance measuring unit 2. A third reference portion P3 with the tip of the measurement wire L2 as a predetermined portion (central portion) of the bottom wall surface portion 21A of the wastewater treatment pit 21 so as to be pulled out in the vertical direction and the measurement wire L2 is erected in a vertical state. Connect and fix to.

Therefore, the measuring wire L1 of the first distance measuring unit 1 and the measuring wire L2 of the second distance measuring unit 2 are arranged in a state of being substantially orthogonal to each other, and the wastewater treatment pit 21 is arranged at the first distance measuring unit 1. The width (inner air width) is measured, and the height (inner air height) of the wastewater treatment pit 21 is measured by the second distance measuring unit 2. The measuring wire L1 of the first distance measuring unit 1 and the measuring wire L2 of the second distance measuring unit 2 may be arranged so as to be oblique to each other. In this case, rectangular strain is used when converting strain. By performing the analysis, the degree of deformation (strain displacement) of the structure can be qualitatively evaluated.

Further, the measuring wire L1 of the first distance measuring unit 1 and the measuring wire L2 of the second distance measuring unit 2 are housed in a tubular member 4 arranged in the wastewater treatment pit 21.

In this embodiment, the tubular member 4 is made of a vinyl chloride tube, and the base end of the tubular member 4 for accommodating the measurement wire L1 of the first distance measuring unit 1 is in contact with the first distance measuring unit 1. It is provided in a suspended state via a hanging member 6 (wire) suspended from the top wall surface portion 21D in a horizontal state where the tip is in contact with the wall surface (right wall surface portion 21C), and is provided in a suspended state of the second distance measuring unit 2. The tubular member 4 for accommodating the measuring wire L2 is provided in a hanging state in which the base end is in contact with the second distance measuring unit 2 and the tip is in contact with the wall surface (bottom wall surface portion 21A).

Further, a bellows portion 4a whose length can be adjusted is provided at the tip portion of the tubular member 4.

Since the wastewater treatment pit 21 is a dark place, a reflective material that reflects the irradiation light emitted by a worker for inspection or the like may be provided on the peripheral surface of the tubular member 4.

Further, the first distance measuring unit 1 and the second distance measuring unit 2 are connected to the data recording unit 7 (data logger "GTR-24H" manufactured by Geotech Service Co., Ltd.) as shown in FIG. The data measured by the first distance measuring unit 1 and the second distance measuring unit 2 is recorded by the data recording unit 7 at any time. An inclination measuring unit 5 described later is connected to the data recording unit 7, and data obtained from the inclination measuring unit 5 is recorded.

Further, this embodiment includes a displacement amount calculation unit that calculates the displacement amount of the wastewater treatment pit 21 based on the data recorded by the data recording unit 7.

As shown in FIG. 4, the displacement amount calculation unit is composed of a management computer (not shown) that processes (accumulates / processes) the data recorded by the data recording unit 7, and is composed of the first distance measuring unit 1 and the second. The distance measuring unit 2 and the inclination measuring unit 5 are connected to the data recording unit 7.

The management computer may be a personal computer brought to the measurement site such as a notebook computer or a tablet personal computer, or a wireless signal transmission unit is provided in the data recording unit 7, and the data recorded by the data recording unit 7 is used as a wireless signal. It may be a remote personal computer (data center) that receives signals from the transmitter via an internet line.

Reference numeral 8 is a storage box, 9 is a PT temperature converter, and 10 is a battery (DC24V).

The tilt measuring unit 5 is a sensor that detects the tilt of the liquid level proportional to the tilt as a change in the capacitance of the left and right electrodes and converts it into an electric signal, and measures the tilt values of the two axes, the X-axis and the Y-axis. The inclinometer "GIC-10WD" manufactured by Get Geotech Service Co., Ltd. is used.

In this embodiment, as shown in FIGS. 1 and 2, the inclination measuring unit 5 is arranged on the bottom wall surface portion 21A of the wastewater treatment pit 21, and the longitudinal direction (Y direction) and the transverse direction (X) of the bottom wall surface portion 21A are arranged. Measure the inclination of the direction). In this embodiment, a thermometer is attached to the inclination measuring unit 5.

When installing the displacement measuring device of the wastewater treatment pit 21 according to the present embodiment having the above configuration, as shown in FIG. 5, at three points 5 to 10 m from the left and right wellheads, ST1 and ST3 and an intermediate point ST2. Will be installed.

Since this embodiment is configured as described above, the first distance measuring unit 1 determines that the first reference portion P1 on the inner wall surface of the wastewater treatment pit 21 and the second reference portion facing the first reference portion P1 in the radial direction. A measuring wire L1 is erected between P2 and the distance between the first reference portion P1 and the second reference portion P2 is measured, and the second distance measuring unit 2 measures the first distance measuring unit 1. The third reference portion P3 on the inner wall surface of the wastewater treatment pit 21 and the fourth reference portion P4 facing the third reference portion P3 in the radial direction are arranged so as to have a length in a direction intersecting the wire rod L1. A measuring wire L2 is erected between them to measure the distance between the third reference portion P3 and the fourth reference portion P4.

The data measured by the first distance measuring unit 1 and the second distance measuring unit 2 is recorded by the data recording unit 7. The data of the data recording unit 7 is processed by, for example, a computer to calculate the displacement amount of the wastewater treatment pit 21.

From this calculated displacement amount, the state (strain displacement) of the wastewater treatment pit 21 can be surely grasped, and the repair time and the abandoned mine time of the wastewater treatment pit 21 can be confirmed.

Further, the displacement amount of the wastewater treatment pit 21 can confirm the amount of movement of the soil mass in which the wastewater treatment pit 21 is provided so far, and further, based on the displacement amount of the wastewater treatment pit 21, the wastewater treatment pit 21 It is possible to predict the amount of displacement in the future and the amount of movement of the soil mass in which the flat water treatment pit 21 is provided.

Therefore, according to this embodiment, by quantifying the state (strain displacement) of the wastewater treatment pit 21 due to the movement of the soil mass (for example, landslide) as the displacement, the state of the wastewater treatment pit 21 can be simplified even if the person is not an expert. Moreover, it can be confirmed reliably, and if an abnormality is confirmed, it can be dealt with immediately.

Further, since the displacement measuring device of this embodiment uses wire rods instead of laser light, it is not easily affected by changes in weather conditions, for example, and can measure with high accuracy (laser light is condensed). The accuracy may drop due to the reflectance due to the influence of water, fog, etc.) Moreover, since the device itself is inexpensive, measurement can be performed at low cost.

In addition, this embodiment can monitor the movement of soil mass (whether or not the landslide activity is active).

That is, as a specific example of the monitoring method using this embodiment, the displacement measuring device according to this embodiment for measuring the strain displacement of the wastewater treatment pit 21 provided in the ground and the data (displacement) measured by this displacement measuring device. The displacement amount calculation unit that calculates the displacement amount of the wastewater treatment pit 21 based on the data) and the displacement amount calculated by this displacement amount calculation unit confirm the past movement amount of the soil mass in which the wastewater treatment pit 21 is provided. It is possible to perform a monitoring method using a soil mass movement monitoring device composed of a soil mass movement amount detecting means.

Further, based on the displacement amount of the wastewater treatment pit 21 calculated by the displacement amount calculation unit, the future displacement amount of the wastewater treatment pit 21 is predicted, and the future movement of the soil mass in which the wastewater treatment pit 21 is provided. It may have a means for predicting the amount of soil mass movement to predict the amount.

Further, when a plurality of wastewater treatment pits 21 are provided, the soil mass movement amount prediction means is a soil mass movement amount prediction means for predicting the future movement amount of the soil mass in a predetermined area where the plurality of wastewater treatment pits 21 are provided. May have.

In addition, the displacement measuring device according to this embodiment that measures the strain displacement of the wastewater treatment pit 21 provided in the ground, and the wastewater treatment pit 21 based on the data (displacement data) measured by this displacement measuring device. A wastewater treatment pit monitoring device composed of a displacement amount calculation unit that calculates the displacement amount and an anti-state confirmation means that confirms the timing of repair or abandonment of the wastewater treatment pit 21 based on the displacement amount calculated by the displacement amount calculation unit. The monitoring method used becomes possible.

The present invention is not limited to the present embodiment, and the specific configuration of each constituent requirement can be appropriately designed.

L1 Measuring wire L2 Measuring wire P1 First reference position P2 Second reference position P3 Third reference position P4 Fourth reference position 1 First distance measurement unit 2 Second distance measurement unit 4 Tubular member 5 Tilt measurement unit 7 Data recording Department
21 Wastewater treatment pit
21A Bottom wall surface
21B left wall
21C right wall
21D top wall
21a running water groove

Claims (12)

A displacement measurement apparatus of the wastewater treatment pit provided in the ground, provided the wastewater treatment first reference portion position or we second reference part to a measuring wire position diametrically opposite the underground wall to erection state distribution in a state having a first distance measuring section, to a length direction crossing the measuring wire of the first distance measuring section for measuring a distance between the second reference part and the first reference part Te wherein said third reference part provided measuring wire that will be in the wastewater treatment bridged state the measuring wire until the fourth reference portion at a position opposing to the third reference portion position or et diametrical direction of the underground wall first possess a second distance measuring unit for measuring the distance between the four reference part, and a data recording unit that records the data measured at the first distance measuring unit and the second distance measuring unit, the first distance The measuring unit and the second distance measuring unit are expansion meters that measure the amount of distance displacement between the reference parts by the displacement of the measuring wire erected between the reference parts, and the first distance measuring unit. The measuring wire of the distance measuring unit is housed in a length-adjustable tubular member whose base end is in contact with the first distance measuring unit and whose tip is in contact with the second reference portion. The measuring wire of the measuring unit is characterized in that the base end is housed in a length-adjustable tubular member whose base end is in contact with the second distance measuring unit and whose tip is in contact with the third reference portion. Displacement measuring device for wastewater treatment pits. The displacement measuring device for a wastewater treatment pit according to claim 1, wherein a reflective material is provided on the peripheral surface of the tubular member. The displacement measuring device for a wastewater treatment pit according to any one of claims 1 and 2 , wherein the tubular member is a vinyl chloride pipe. In the displacement measuring device for the wastewater treatment pit according to any one of claims 1 to 3 , the wastewater treatment pit is erected on a bottom wall surface portion having a water flow groove portion in the length direction and on the left and right sides of the bottom wall surface portion. The wastewater treatment pit is characterized in that it has a tunnel structure including a left wall surface portion and a right wall surface portion, and a top wall surface portion connected to the left wall surface portion and the right wall surface portion and facing the bottom wall surface portion. Displacement measuring device. In the displacement measuring device for the wastewater treatment pit according to claim 4 , the first reference portion is set as one of the left wall surface portion and the right wall surface portion, and the second reference portion is the left wall surface portion and the left wall surface portion. As the other predetermined portion of the right wall surface portion, the measurement wire rod is erected horizontally between the first reference portion and the second reference portion, while the third reference portion is the third reference portion. The measuring wire is erected vertically between the third reference portion and the fourth reference portion, with the fourth reference portion as a predetermined portion of the bottom wall surface portion and the top wall surface portion as a predetermined portion. Displacement measuring device for wastewater treatment pits, which is characterized in that it is configured as such. The displacement measuring device for a wastewater treatment pit according to any one of claims 4 and 5 , further comprising an inclination measuring unit for measuring the inclination of the bottom wall surface in the longitudinal direction and the transverse direction. Displacement measuring device. The displacement measuring device for a wastewater treatment pit according to any one of claims 1 to 6 includes a displacement amount calculation unit that calculates the displacement amount of the wastewater treatment pit based on the data recorded by the data recording unit. Displacement measuring device for wastewater treatment pits. In the displacement measuring device for the wastewater treatment pit according to any one of claims 1 to 7, the measuring wire extending from the first distance measuring unit and the measurement extending from the second distance measuring unit. A wire rod is a displacement measuring device for a wastewater treatment pit, which is provided in a state of being substantially orthogonal to each other. Displacement of the wastewater treatment pit based on the displacement measuring device according to any one of claims 1 to 8 for measuring the strain displacement of the wastewater treatment pit provided in the ground and the data measured by the displacement measuring device. It is composed of a displacement amount calculation unit for calculating the amount and a soil mass movement amount detecting means for confirming the past movement amount of the soil mass in which the wastewater treatment pit is provided by the displacement amount calculated by the displacement amount calculation unit. A soil mass movement monitoring device characterized by this. In the soil mass movement monitoring device according to claim 9, the wastewater treatment pit is provided by predicting the future displacement amount of the wastewater treatment pit based on the displacement amount of the wastewater treatment pit calculated by the displacement amount calculation unit. A soil mass movement monitoring device characterized by having a soil mass movement amount predicting means for predicting the future movement amount of the soil mass. In the soil mass movement monitoring device according to claim 10 , a plurality of the wastewater treatment pits are provided in the ground, and the soil mass movement amount predicting means is a soil mass in a predetermined area where the plurality of wastewater treatment pits are provided. A soil mass movement monitoring device characterized by being a means for predicting the amount of soil movement in the future. Displacement of the wastewater treatment pit based on the displacement measuring device according to any one of claims 1 to 8 for measuring the strain displacement of the wastewater treatment pit provided in the ground and the data measured by the displacement measuring device. The wastewater is characterized by being composed of a displacement amount calculation unit for calculating the amount and a pit state confirmation means for confirming the timing of repair or abandonment of the wastewater treatment mine based on the displacement amount calculated by the displacement amount calculation unit. Processing pit monitoring device .

Images