Apparatus and method for measuring ground subsidence by using initial position identification

Abstract

The present invention relates to an apparatus and a method for measuring ground subsidence by using initial position identification, the apparatus calculating the movement distance of a pressing unit that presses a presser (or the ground) while moving toward the ground, and detecting that the pressing unit has returned to the initial position, thereby determining ground subsidence by using the movement distance when the pressing unit has returned to the initial position. The apparatus for measuring ground subsidence by using initial position identification, according to the present invention, comprises a case (10) provided on the ground subject to ground subsidence; a pressing unit (40), which is mounted in the case so as to be vertically movable by a lifting / lowering means, and which, when being lowered, presses a presser (50) provided on the bottom of the case or presses the ground surface; an initial position detection unit for detecting that the pressing unit returns to the initial position; and a control unit, which controls the lifting / lowering means, calculates the lowering distance of the lifting / lowering means, and then determines ground subsidence on the basis of the lowering distance, wherein the control unit filters the calculated lowering distance when the initial position detection unit does not detect the return of the pressing unit, and determines ground subsidence by using the lowering distance when the initial position detection unit detects that the pressing unit has raised and returned to the initial position.

Description

Device and method for measuring ground subsidence using initial position confirmation

[0001] The present invention relates to ground subsidence measurement, and more particularly, to a ground subsidence measurement device and method using initial position confirmation, which determines ground subsidence by using the movement distance of a pressure part moved toward the ground and the results of confirmation of the position (initial position, reference position) of the pressure part.

[0002] This section provides background information related to the subject matter of this application and is not necessarily prior art.

[0003] The causes of land subsidence are primarily natural and anthropogenic. Natural causes include water seeping into the bedrock near the ground surface, eroding soluble rocks like limestone. As the water seeps through the eroded rock, the upper soil is forced downward. This causes the cavities in the rock to fill, creating new cavities near the surface. This process repeats, expanding the cavities and causing the upper soil layer to collapse. Human-induced causes include the construction of various structures as modern society develops, which in turn increases the importance of the ground.

[0004] Underground civil engineering and architectural structures, including apartment complexes, gas pipelines, water and sewage pipes, oil pipelines, manholes, dams, bridges, buildings, and power plants, must be constructed on a foundation of the ground. However, ground subsidence or uneven settlement can occur when the allowable bearing capacity of the ground is low, the thickness of the soft layer varies, the structure rests on heterogeneous stratum, or the groundwater level changes. For these reasons, potential ground subsidence is bound to occur within a certain area before and after construction.

[0005] For civil engineering or architectural structures such as the above, it is essential to have technology to check for ground subsidence or uneven subsidence.

[0006] Existing soil subsidence sensing devices, used to measure ground subsidence and uneven settlement, transmit electromagnetic waves originating from an antenna on the surface, penetrating underground, and then reflecting back. These waves are then stored and analyzed to determine the presence and depth of objects, thereby determining the presence or absence of subsidence. However, these devices have limitations: their penetration rate is limited to 1.5 m and their scope is limited to roads.

[0007] Patent Registration No. 10-2511014 relates to a ground subsidence measuring device comprising: an outer casing having a hollow interior; a cover that seals the upper end of the outer casing to create a sealed interior of the outer casing; an elevating member that is mounted on the outer casing and elevates via a driving means; a presser that is inserted into the interior of the outer casing and has a bottom surface supported on the ground, and presses the ground while descending without eccentricity when the elevating member is lowered; a distance sensor that detects the distance traveled by the elevating member; a humidity sensor that measures humidity in the ground around the outer casing; and a control unit that controls the elevating member and the distance sensor, determines ground subsidence based on the measurement value of the distance sensor, and controls the measurement of ground subsidence by driving the elevating member when the humidity increases without a change in weather based on the measurement value of the humidity sensor. The device has the following problems.

[0008] The ground subsidence is determined by using the distance the elevating member descends to the ground when it presses the pushbutton and then returns to its original position. However, the reliability of the ground subsidence determination is low because it is impossible to confirm that the elevating member has returned to its initial position. To be more specific, the initial position of the elevating member does not change once set, and the ground subsidence is determined using the distance it has descended from the initial position. However, due to damage to the casing and elevating member or a malfunction of the driving means, the elevating member may not return to the initial position and may descend and rise toward the ground. In other words, although the elevating member has not actually returned to the initial position, it is mistakenly considered to have returned to the initial position, and the movement distance is calculated and the ground subsidence is determined based on the movement distance, which causes errors in the results of the ground subsidence.

[0009] In addition, since the lifting member is suspended through the upper driving means, it shakes severely, and this shaking is transferred to the driving means and the control unit, causing damage to the driving means and the control unit as well as causing program errors.

[0010] [Prior Art Literature]

[0011] [Patent Document]

[0012] (Patent Document 1) Registered Patent No. 10-2511014

[0013] (Patent Document 2) Registered Patent No. 10-2455032

[0014] The present invention is intended to solve the above-described problem, and provides a ground subsidence measuring device and method using initial position confirmation, which calculates the movement distance of a pressurizing part that presses a pusher (or the ground) while moving toward the ground, detects that the pressurizing part has returned to the initial position, and determines ground subsidence using the movement distance when the pressurizing part has returned to the initial position.

[0015] The ground subsidence measuring device using initial position confirmation according to the present invention is characterized in that it presses a pushbutton (or the ground) supported on the ground while the pressurizing part is lowered, calculates the descending distance at this time, and determines ground subsidence by comparing the descending distance, and detects that the pressurizing part has returned to the initial position, and filters (deletes) the calculated descending distance or uses it as a basis for ground subsidence.

[0016] According to the device and method for measuring ground subsidence using initial position confirmation according to the present invention, the descending distance until the pressurizing member is depressed with a set load while descending toward the pressurizing member (or the ground) is calculated, and the ground subsidence is determined by comparing the preceding and succeeding descending distances, and at this time, instead of using all of the calculated descending distances, only the descending distance value when the pressurizing member has returned to the initial position is used as information for determining ground subsidence, and when the pressurizing member has not returned to the initial position, the calculated descending distance is not used, that is, an incorrect descending distance calculated while descending from a position other than the initial position is not used, so that the reliability of the ground subsidence determination is improved, and ultimately, the safety of civil engineering structures is secured through accurate determination of ground subsidence.

[0017] Figure 1 is a diagram showing the overall configuration of a ground subsidence measurement device using initial position confirmation according to the present invention.

[0018] Figure 2 is a drawing showing a pressurizing unit, fixing means, and sealing means applied to a ground subsidence measurement device using initial position confirmation according to the present invention.

[0019] Figure 3 is a flow chart of a ground subsidence measurement method using initial position confirmation according to the present invention.

[0020] In the following description of the present invention, detailed descriptions of related known functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present invention. Furthermore, the terms described below are defined in light of their functions within the present invention and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the overall content of this specification.

[0021] As shown in Fig. 1, a ground subsidence measuring device (100) using initial position confirmation according to the present invention includes a case (10), a driving means (20), an elevating member (30), a pressurizing member (40), a push button (50), a limit sensor (60) as an initial position detecting unit, and a control unit (distance measuring device) (70).

[0022] 1. Case (10).

[0023] The case (10) is a cylindrical (cylindrical, square, etc.) structure having a space inside which a driving means (20) is installed, and the bottom must be open so that the push button (40) touches the ground, and the top is closed to protect the driving means (20), etc., and for assembly and maintenance, the top is open and can be opened and closed by an assembly-type cover (11).

[0024] The case (10) includes a tipping prevention member (12) to ensure that the bottom is stably supported on the ground. The tipping prevention member (12) is in the shape of a wing formed outwardly on the periphery of the case (10).

[0025] In addition, the case (10) is configured to fix the guide rod (31) of the lifting member (30) and has a fixing ring (13) formed on the inner surface. The fixing ring (13) has a key groove (14) formed on the inner surface. After the key projection (33) formed on the circumference of the guide rod (32) passes through the key groove (14), the key projection is fixed by being caught on the bottom of the fixing ring (13) through the rotation of the guide rod (31).

[0026] When including such a fixing means, the assembly method of the elevating member (30) is as follows. The elevating member (30) (combined with the driving means (20)) is inserted into the inside of the case (10), and further lowered while the key projection (33) is aligned with the key groove (14) to lower the key projection (33) to the bottom of the key groove (14), and the elevating member (30) is fixed by turning it to one side so that the key projection (33) hangs under the fixing ring (13) next to the key groove (14). At this time, the elevating member (30) must not fall downward, and therefore, in order to fix the elevating member (30) at this position, an annular support jaw is formed, for example, on the inner circumference of the case (10), and the elevating member (30) includes a catch jaw that hangs over the support jaw on the periphery.

[0027] The positions of the keyhole (33) and the keyway (14) can also be swapped.

[0028] 2. Driving means (20).

[0029] The driving means (20) and the lifting member (30) are components of an lifting means for lifting the pressurizing part (40).

[0030] The driving means (20) includes, for example, a motor that generates rotational energy by receiving power through a control unit (60) or manual operation by an operator, a screw type that rotates by the motor and elevates the lifting member (30), a hydraulic type, etc.

[0031] 3. Elevating member (30).

[0032] It includes a lifting bar (31) that is connected to the screw bolt of the driving means (20) so that it can be raised and lowered, and a guide bar (32) that protects the lifting bar (31) and guides the raising and lowering.

[0033] Since only the upper part of the elevator shaft (31) and the guide shaft (32) are connected to the driving means (20) and the remaining part, especially the lower part, is free, shaking may occur in this part. To solve this, as described above, the lower part of the guide shaft (32) is fixed to the case (10), and a key projection (33) is formed on the guide shaft (32) and the key projection (33) is fixed to the fixing ring (13) of the case (10).

[0034] According to this structure, since the guide rod (32) is supported on both the upper and lower parts by the case (10), the lifting rod (31) is raised and lowered without shaking, and therefore, when lowering, the pressurizing part (40) is lowered without shaking, so that the push button (50) can be stably pressed, and as a result, the reliability of ground subsidence measurement can be improved.

[0035] A pressure member (40) is connected to the lower part of the elevator shaft (31), and a ball joint (34) is included so that the pressure member (40) can tilt in accordance with the inclination of the push button (50).

[0036] A sealing means is included to prevent groundwater, etc. from flowing into the case (10) and the driving means (20) from being submerged or not operating normally.

[0037] The above sealing means includes a roughly cylindrical packing (35) formed at the lower end of the guide rod (32) as shown in FIGS. 1 and 2, the outer surface of which is supported by the inner surface of the case (10), and an O-ring (36) coupled to the periphery of the packing (35) to ensure watertightness.

[0038] The aforementioned key protrusion (33) can also be formed in the packing (35), as illustrated in the drawing.

[0039] It is possible to determine the initial position of the pressurizing portion (40) through the fixing structure of the fixing ring (13) and the guide rod (32).

[0040] 4. Pressurized part (40).

[0041] The pressurizing member (40) is preferably a block with a wider cross-sectional area than the lifting bar (31) and is connected to the ball joint (34). The structure of the ball joint (34) is composed of two upper and lower blocks that surround the ball joint (34) and are connected to each other at the upper and lower portions of the ball joint (34).

[0042] The pressurizing portion (40) may include a convex protrusion (41) facing upwards that is linked to the detection operation of the limit sensor (60) at the top.

[0043] 5. Pushbutton (50).

[0044] The push button (50) is inserted into the inside of the case (10) and is independently placed on the ground. The outer diameter is preferably the maximum size that can be lowered if it can be inserted into the inside of the case (10). Even if there is partial subsidence in the ground or subsidence occurs around the case (10), it can be lowered without eccentricity to enable accurate measurement of the amount of ground subsidence. In other words, if the pressurizing part (40) can be lowered without eccentricity without using the push button (50), the push button (50) can be omitted.

[0045] 6. Limit sensor (60).

[0046] The limit sensor (60) is mounted toward the bottom of the fixed guide rod (32), preferably the packing (35), to check the pressurizing portion (40), and is a method of detecting that the pressurizing portion (40) has arrived at the initial position, for example, based on the distance value when the pressurizing portion (40) arrives at the initial position.

[0047] Detection of the limit sensor (60) is also the basis for the control unit (70) to stop the operation of the driving means (20).

[0048] The limit sensor (60) is only an example of an initial position detection unit, and any method capable of confirming the return of the pressurizing unit (40) is possible.

[0049] 7. Control unit (distance measuring device) (70).

[0050] The control unit (70) controls the driving of the driving means (20) (forward and reverse rotation of the motor, stopping of the motor, etc.), calculates the descending distance of the lifting member (30), stores the calculated descending distance, and compares the two descending distance values ​​before and after to determine ground subsidence.

[0051] At this time, the control unit (70) uses or filters (deletes) the calculated descent distance based on the detection value of the limit sensor (60) as data for determining ground subsidence, that is, the calculated descent distance is used when the limit sensor (60) detects the return of the pressurizing unit (40), and if, as a result of the upward control after the pressurizing unit (40) has been lowered, the limit sensor (60) does not detect the return of the pressurizing unit (40), the calculated descent distance is not used to determine ground subsidence.

[0052] The present invention is not limited to calculating the descent distance using the program of the control unit (70), and may also include a sensor that measures the descent distance of the lifting bar (31) or the descent distance of the pressurizing unit (40). That is, the calculation by the control unit (70) includes both calculating the descent distance using the rotation speed and pitch of the screw bolt through the program, and using the distance value detected by a separate sensor.

[0053] Additionally, the control unit uses artificial intelligence (AI) to control the measurement cycle, measurement load, and measurement time (load application time).

[0054] Additionally, a setting unit and a power unit that are linked to the control unit (70) are included.

[0055] The above setting section is for the administrator to set the measurement cycle, measurement load by the pressurizing section (40), measurement time, etc.

[0056] A power supply unit that supplies power to the driving means (20) and the control unit (70) must be included, and the power supply unit is preferably renewable energy using a battery, solar power generation, etc.

[0057] In addition, the present invention includes a tilt sensor. The tilt sensor measures the tilt of the ground subsidence measuring device (100), and the control unit (70) determines the surface tilt based on the detection value of the tilt sensor.

[0058] The method for measuring ground subsidence using initial position confirmation according to the present invention is as follows (Fig. 3).

[0059] 1. Installation of ground subsidence measurement device.

[0060] A ground subsidence measuring device (100) is installed in a place where ground subsidence is expected (a construction site for a building, a water supply and sewage pipe, etc.), for example, the ground subsidence measuring device (100) is installed on the ground, or a groove is formed in the ground, the ground subsidence measuring device (100) is inserted and installed in the groove, and then backfilled to install it. At this time, the cover (11) is exposed to the ground surface.

[0061] A push button (50) is installed inside the case (10).

[0062] Before or after installing the ground subsidence measuring device (100), measurement information is set, and the measurement information includes the measurement cycle, the load applied through the pressurizing part (40), etc.

[0063] 2. Measurement of ground subsidence.

[0064] A. Lowering of the pressurized section.

[0065] The control unit (70) determines the measurement time through the measurement cycle and timer, controls the driving means (20) to lower the lifting bar (31) of the lifting member (30), and lowers the pressurizing unit (40) toward the push button (50) through the lifting bar (31).

[0066] The pressurizing part (40) is lowered by pressing the push button (50), the load value at this time is measured, and the pressurizing part (40) is lowered until the measured load value satisfies the standard load value (or until the pressurizing part (40) does not lower).

[0067] When the measured load value satisfies the standard load value, the driving means (20) is controlled to raise the lifting bar (31) and the pressurizing part (40).

[0068] B. Calculate the descent distance.

[0069] The control unit (70) calculates and stores the distance the elevator shaft (31) descends and the descending distance until the measured load value satisfies the standard load value.

[0070] D. Pressure rise.

[0071] The driving means (20) is controlled to raise the elevator shaft (31).

[0072] 3. Pressure return detection.

[0073] The return of the pressurized part (40) is detected and judged through the limit sensor (60).

[0074] At this time, when the return of the pressurized portion (40) is detected through the limit sensor (60), the driving means (20) is controlled to stop, thereby stopping the rise of the elevator shaft (31).

[0075] 4. Determination of ground subsidence.

[0076] The control unit (70) compares the preceding and succeeding descent distances, and if their values ​​are the same, it determines that ground stabilization has occurred, and if their values ​​are different, it determines that ground subsidence has occurred.

[0077] In this process, the control unit (70) determines ground subsidence as follows based on two data: the detection value of the limit sensor (60) and the descent distance.

[0078] When the limit sensor (60) detects the return of the pressurized portion (40), the calculated descent distance is used to determine ground subsidence, and ground subsidence is determined after comparing it with the preceding descent distance.

[0079] The results of ground subsidence judgment are stored in various forms and transmitted to the server and / or the administrator's portable terminal, for example, transmitted as "normal", "subsidence", and the numerical value is transmitted together in the case of "subsidence".

[0080] 5. Action.

[0081] If the limit sensor (60) does not detect the return of the pressurized portion (40), the calculated descent distance is not used for ground subsidence but is filtered (deleted or stored separately).

[0082] In addition, since it is determined that the pressurized part (40) has not returned, there is no meaning in measuring ground subsidence, so this is reported to the manager and the manager is asked to take action.

[0083] For example, the control unit (70) transmits a return non-detection signal of the pressurized unit (40) to a remote server and / or a manager's portable terminal via a communication module, and the manager checks the signal output to the server and / or portable terminal and moves to the installation site of the ground subsidence measuring device (100) to inspect the ground subsidence measuring device (100).

[0084] 6. Change the ground subsidence measurement cycle.

[0085] The control unit (70) compares the previous and current descent distances among the ground subsidence measurement results and changes the subsidence cycle according to the result. For example, if it is determined that the current descent distance is longer than the previous descent distance, the measurement cycle is shortened. Here, the measurement cycle is determined in various ways depending on the comparison value. Conversely, if the current descent distance is shorter than the previous descent distance, the measurement cycle may be lengthened.

[0086] [Explanation of symbols]

[0087] 10: Case, 11: Cover

[0088] 12: Anti-fall section, 13: Fixing ring

[0089] 14: Key home,

[0090] 20: driving means, 30: lifting member

[0091] 40: pressurized part, 50: push button

[0092] 60: limit sensor, 70: control unit

Claims

1. A case installed on ground subject to ground subsidence; In the above case, a pressurizing part that is mounted so as to be able to be lifted and lowered via a lifting means and presses a push button at the bottom of the case or presses the ground when lowering; An initial position detection unit that detects that the pressurized portion returns to the initial position; Including a control unit (distance measuring device) that controls the above-mentioned lifting means, calculates the descent distance of the above-mentioned lifting means, and then determines ground subsidence based on the descent distance. A ground subsidence measuring device using initial position confirmation, characterized in that the control unit filters the calculated descent distance when the initial position detection unit does not detect the return of the pressurizing unit, and determines ground subsidence using the descent distance when the initial position detection unit detects that the pressurizing unit has risen and returned to the initial position.

2. A ground subsidence measuring device using initial position confirmation, characterized in that in claim 1, the control unit calculates the lowering distance of a screw-type or hydraulic lifting means, determines ground subsidence based on the lowering distance, and adjusts the measurement time, measurement cycle, and measurement load.

3. A ground subsidence measuring device using initial position confirmation according to claim 1, wherein the lifting means is lifted by a driving means and includes a lifting bar having the pressurizing part coupled to the lower part, and a guide bar which is a fixed body supporting the lifting bar, and the guide bar has a circumferential portion of the lower part connected to the case via a fixing means to support the lower part of the lifting bar.

4. A ground subsidence measuring device using initial position confirmation, characterized in that in claim 3, the fixing means includes a keyway formed along a circumferential direction on the inner surface of the case, a packing coupled to the guide rod and having a peripheral portion supported on the inner surface of the case, and a key projection formed on the packing and fixed to a fixing ring around the keyway after passing through the keyway from top to bottom.

5. A ground subsidence measuring device using initial position confirmation, characterized in that the initial position detection unit according to claim 1 or claim 3 is a limit sensor.

6. A ground subsidence measurement device using initial position confirmation, characterized in that it includes an inclination sensor that measures the inclination of the case according to claim 1 or claim 3.

7. A method for measuring ground subsidence using a ground subsidence measuring device using initial position confirmation according to claim 1, A first step of installing a ground subsidence measuring device using the initial position confirmation at a location for measuring ground subsidence; A second step of lowering the pressurized portion of the ground subsidence measuring device using the initial position confirmation based on the load value and then raising it back to the initial position, and calculating the lowering distance at this time; A third step of detecting that the pressurized portion returns to its initial position; A fourth step of determining ground subsidence by comparing the descent distance calculated through the second step when it is detected that the pressurized portion has returned to its initial position through the third step; A method for measuring ground subsidence using initial position confirmation, characterized in that the descending distance calculated in the second step is filtered when it is detected through the third step that the pressurized portion has not returned to the initial position.

8. A method for measuring ground subsidence using initial position confirmation, characterized in that, in claim 7, the measurement cycle is adjusted by comparing the previously calculated descent distance with the subsequently calculated descent distance among the descent distance values ​​calculated in the second step, and the measurement load and measurement time are adjusted.

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