Subsidence measurement system and subsidence measurement method

Abstract

To provide a subsidence measurement system and subsidence measurement method that can grasp an amount of subsidence of a structure such as a support and the like in real time.SOLUTION: A subsidence measurement system comprises: a reference tank 16 that accommodates a measurement-purpose liquid; differential pressure detectors 18 that are installed at measurement points P set respectively in a structure (a support 14) and a ground G, and outputs, as a differential pressure signal, a pressure difference between pressure of the accommodated liquid and prescribed reference pressure; pressure guide pipes 20 that allow the reference tank 16 and the differential pressure detectors 18 to communicate with each other; computation means 22 that has an amount-of-subsidence computation unit 22A obtaining height differences each between a reference surface and each measurement point P on the basis of the differential pressure signals from the differential pressure detectors 18, and computing an amount of subsidence of the measurement point P from the difference in height, and an amount-of-deformation computation unit 22B computing an amount of deformation of the structure (the support 14) due to the subsidence; and presentation means that responds to a request from a user to present a computation result by the computation means 22 to a terminal 24 on a user side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a settlement measurement system and a settlement measurement method for measuring the settlement amount of structures such as struts and shoring.

Background Art

[0002] Conventionally, when assembling a fixed strut and shoring at the erection site and constructing a concrete superstructure (e.g., bridge, viaduct) on the fixed strut and shoring, it is necessary to grasp the settlement amount (strut and shoring deformation amount + ground settlement amount) of the strut and shoring during concrete placement at any time. Therefore, during concrete placement, personnel specialized in settlement measurement are arranged.

[0003] As a conventional settlement measurement method, as shown in FIG. 4, there is known a method in which worker 1 sights a target object (not shown) inside the strut and shoring with a leveling instrument 3 from the outside of the strut and shoring 2 to measure the settlement amount. Also, as a measurement method that does not rely on manual labor, for example, those described in Patent Documents 1 to 3 are known.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, while the settlement data measured using the conventional method described above needs to be compiled and shared among construction personnel as needed, communication is difficult amidst the busy concrete pouring work, potentially hindering data sharing. Furthermore, with the conventional level surveying method shown in Figure 4, measurement near the center of the support structure where visibility is limited is difficult. For these reasons, there was a need for a technology that would allow construction personnel to grasp settlement amounts in real time and easily measure settlements even in areas with limited visibility, such as near the center of the support structure.

[0006] The present invention has been made in view of the above, and aims to provide a settlement measurement system and settlement measurement method that can grasp the amount of settlement of structures such as scaffolding in real time. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the settlement measurement system according to the present invention is a system for measuring the amount of settlement of a structure installed on the ground or foundation, and is characterized by comprising: a reference tank installed on a reference surface and containing a liquid for measurement; a differential pressure detector installed on the structure and the ground or foundation, respectively, and outputting the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal; a pressure guiding pipe connecting the reference tank and the differential pressure detector; a settlement amount calculation unit that determines the height difference between the reference surface and the measurement point based on the differential pressure signal from the differential pressure detector and calculates the amount of settlement of the measurement point from a predetermined reference value based on this height difference; a deformation amount calculation unit that calculates the amount of deformation of the structure due to settlement; and a presentation means that presents the calculation results by the calculation means to the user's terminal in response to a request from the user.

[0008] Furthermore, another settlement measurement system according to the present invention is characterized in that, in the above-described invention, the structure is a support structure installed on the ground or foundation while supporting the superstructure from below, and the measurement points are set near the upper end and near the lower end of the support structure, respectively.

[0009] Furthermore, another settlement measurement system according to the present invention is characterized in that, in the above-described invention, it further comprises a determination means for determining whether the calculated deformation amount of the structure exceeds a preset allowable amount, and an alarm output means for outputting an alarm to the user's terminal when the determination means determines that the deformation amount of the structure exceeds the allowable amount.

[0010] Furthermore, another settlement measurement method according to the present invention is a method for measuring the amount of settlement of a structure provided on the ground or foundation, the present invention comprising the steps of: installing a reference tank containing a liquid for measurement on a reference surface; installing differential pressure detectors at measurement points set on the structure and the ground or foundation, respectively, which output the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal; installing a pressure conductor pipe connecting the reference tank and the differential pressure detector; determining the height difference between the reference surface and the measurement point based on the differential pressure signal from the differential pressure detector; calculating the amount of settlement of the measurement point from a predetermined reference value and the amount of deformation of the structure due to settlement using a calculation means based on this height difference; and presenting the calculation results from the calculation means to the user's terminal in response to a request from the user.

[0011] Furthermore, another settlement measurement method according to the present invention is characterized in that, in the above-described invention, the structure is a support structure provided on the ground or foundation while supporting the superstructure from below, and the measurement points are set near the upper end and near the lower end of the support structure, respectively.

[0012] Furthermore, another settlement measurement method according to the present invention is characterized in that, in the above-described invention, it further comprises the steps of determining whether the calculated deformation amount of the structure exceeds a preset allowable amount, and outputting an alarm to the user's terminal when it is determined that the deformation amount of the structure exceeds the allowable amount. [Effects of the Invention]

[0013] The settlement measurement system according to the present invention is a system for measuring the amount of settlement of a structure installed on the ground or foundation, and comprises a reference tank installed on a reference surface and containing a liquid for measurement, a differential pressure detector installed on the structure and the ground or foundation respectively and outputting the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal, a pressure guiding pipe connecting the reference tank and the differential pressure detector, a calculation means having a settlement amount calculation unit that determines the height difference between the reference surface and the measurement point based on the differential pressure signal from the differential pressure detector and calculates the amount of settlement of the measurement point from a predetermined reference value based on this height difference, and a deformation amount calculation unit that calculates the amount of deformation of the structure due to settlement, and a presentation means that presents the calculation results by the calculation means to the user's terminal in response to a request from the user, thereby providing the effect of being able to grasp the amount of settlement of structures such as shoring in real time.

[0014] Furthermore, according to another settlement measurement system of the present invention, the structure is a support structure installed on the ground or foundation while supporting the superstructure from below, and the measurement points are set near the upper end and lower end of the support structure, respectively, which has the effect of being able to grasp the amount of settlement of the support structure in real time.

[0015] Furthermore, according to another settlement measurement system of the present invention, a determination means for determining whether the calculated deformation amount of the structure exceeds a preset allowable amount, and an alarm output means for outputting an alarm to the user's terminal when the determination means determines that the deformation amount of the structure exceeds the allowable amount, have the effect of enabling early detection of abnormalities in the deformation amount of structures such as shoring.

[0016] Furthermore, according to another settlement measurement method of the present invention, a method for measuring the amount of settlement of a structure installed on the ground or foundation comprises the steps of: installing a reference tank containing a liquid for measurement on a reference surface; installing differential pressure detectors at measurement points set on the structure and the ground or foundation, respectively, which output the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal; installing a pressure conductor pipe connecting the reference tank and the differential pressure detector; determining the height difference between the reference surface and the measurement point based on the differential pressure signal from the differential pressure detector; calculating the amount of settlement of the measurement point from a predetermined reference value and the amount of deformation of the structure due to settlement using a calculation means based on this height difference; and presenting the calculation results from the calculation means to the user's terminal in response to a request from the user. This method has the effect of allowing real-time understanding of the amount of settlement of structures such as shoring.

[0017] Furthermore, according to another settlement measurement method of the present invention, the structure is a support structure installed on the ground or foundation while supporting the superstructure from below, and the measurement points are set near the upper end and lower end of the support structure, respectively, which has the effect of being able to grasp the amount of settlement of the support structure in real time.

[0018] Furthermore, according to another settlement measurement method of the present invention, the method further includes the steps of determining whether the calculated deformation amount of the structure exceeds a preset allowable amount, and outputting an alarm to the user's terminal when it is determined that the deformation amount of the structure exceeds the allowable amount. This has the effect of enabling early detection of abnormalities in the deformation amount of structures such as shoring. [Brief explanation of the drawing]

[0019] [Figure 1] Figure 1 is a schematic diagram showing an embodiment of the settlement measurement system according to the present invention. [Figure 2] Figure 2 is a front cross-sectional view showing an embodiment of the settlement measurement system and settlement measurement method according to the present invention. [Figure 3] FIG. 3 is a diagram showing an example of measurement result display according to the present embodiment. [Figure 4] FIG. 4 is a photographic view showing an example of a conventional settlement measurement method. MODE FOR CARRYING OUT THE INVENTION

[0020] Embodiments of a settlement measurement system and a settlement measurement method according to the present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited by this embodiment.

[0021] As shown in FIGS. 1 and 2, a settlement measurement system 10 according to an embodiment of the present invention is a system for measuring the settlement amount of a support structure 14 (structure) that supports an upper structure 12 during concrete placement from below. This settlement measurement system 10 is installed on a reference plane and includes a reference tank 16 that stores measurement water (liquid), level gauges 18 (differential pressure detectors) installed at a plurality of measurement points P, a pressure guiding pipe 20 that connects the reference tank 16 and each level gauge 18, an arithmetic unit 22 that calculates the settlement amount and the like, and a portable terminal 24 owned by a user. The support structure 14 is installed on the ground G. The reference tank 16 is installed at a position higher than each level gauge 18.

[0022] The level gauge 18 is for measuring the settlement of the support structure 14 and the ground G in real time, and is installed at measurement points P set near the upper end and lower end of the support structure 14, respectively. The upper end measurement point P can be set, for example, near the main beam jack 26 installed at the upper end of the support structure 14. The lower end measurement point P can be set, for example, near the jack base 28 at the lower end of the support structure 14. Each measurement point P is installed at positions spaced apart from each other in a planar manner. The level gauge 18 outputs the pressure difference between the pressure of the water it contains and atmospheric pressure (a predetermined reference pressure) as a differential pressure signal. More specifically, the level gauge 18 has two pressure-receiving chambers separated by a diaphragm (not shown), one of which is filled with water, and the other pressure-receiving chamber is connected to the atmosphere and is equal to atmospheric pressure. The diaphragm deforms by bending in accordance with the pressure difference between the two pressure-receiving chambers. This bending is converted into a differential pressure signal, which is an electrical signal, via a piezoelectric element or the like. This differential pressure signal is then sent via a signal cable C and a control panel S to a computing device 22 installed in a construction management room or the like.

[0023] The pressure sensing pipe 20 is positioned to connect the reference tank 16 and one of the pressure-receiving chambers of each level gauge 18. Since one of the pressure-receiving chambers of the level gauge 18 is filled with water, it transmits the pressure received from the water inside the reference tank 16, which is installed above it.

[0024] The calculation device 22 is a calculation means having a settlement calculation unit 22A that calculates the settlement of the support structure 14 and the ground G, and a deformation calculation unit 22B that calculates the deformation of the support structure 14 due to settlement. The calculation device 22 can be configured using, for example, a computer terminal. The settlement calculation unit 22A determines the height difference between the reference plane and each measurement point P based on the differential pressure signal from each level gauge 18, and calculates the settlement of each measurement point P from the reference value (for example, the initial measurement value) based on this height difference. Then, it determines the settlement of the support structure 14 and the ground G based on this calculation result. On the other hand, the deformation calculation unit 22B calculates the deformation of the support structure 14 due to settlement, taking into account the settlement of the ground G, the amount of shrinkage of the support structure 14 considering the elastic deformation due to changes in the load acting on the support structure 14, the amount of settling of joints, etc. These calculation results may be displayed on the screen of a computer terminal constituting the calculation unit 22 for verification. Alternatively, or in addition to this, the measured value and the difference between the measured value and the planned value may be displayed.

[0025] The mobile terminal 24 is carried by a user who is involved in the construction work and is connected to the computing device 22 via a network N such as a wireless communication network. This mobile terminal 24 functions as a display means that displays the calculation results from the computing device 22 in response to a request from the user. When a display request command is sent from the mobile terminal 24 to the computing device 22, the computing device 22 outputs a predetermined calculation result to the mobile terminal 24, and the calculation result is displayed on the screen of the mobile terminal 24. Furthermore, the measured value and the difference between the measured value and the planned value may also be displayed. By looking at the screen of the mobile terminal 24, the user can grasp the settlement amount of the support structure 14, the settlement amount of the ground G, the deformation amount of the support structure 14, etc. in real time. This allows the user to grasp the behavior of the entire surrounding area, including the support structure 14.

[0026] The operation and function of the above configuration will be explained. As concrete pouring for the superstructure 12 progresses, the height of the upper and lower measurement points P on the shoring 14 changes, which in turn changes the water position head in the pressure-receiving chamber of the level gauge 18 at measurement point P. Since the volume of water is constant, and the water position head and pressure head in the reference tank 16, which is connected to the pressure-receiving chamber by the pressure-sensing pipe 20, do not change, according to Bernoulli's theorem, this change in the water position head in the pressure-receiving chamber becomes a change in the pressure head of the pressure-receiving chamber, and the pressure difference between the pressure-receiving chamber, which is connected to the atmosphere, changes. This change results in a change in the deflection of the diaphragm, which is output as a differential pressure signal.

[0027] Thus, a predetermined relationship holds between the deflection of the diaphragm and the change in its height. By calculating the height difference between the reference plane and each measurement point P in the settlement calculation unit 22A of the calculation device 22, the settlement amount at each measurement point P located above and below the support structure 14 can be determined. Furthermore, the deformation calculation unit 22B can determine the deformation amount of the support structure 14 due to settlement, taking into account the settlement amount of the ground G, the amount of contraction of the support structure 14 due to changes in the load acting on the support structure 14, the amount of settling, etc. These calculation results can be checked at any time on the mobile terminal 24 via the network N upon request from the user.

[0028] Therefore, according to this embodiment, the settlement amount of the support structure 14, the settlement amount of the ground G, the deformation amount of the support structure 14, etc. can be grasped in real time on each user's mobile terminal 24. In addition, it is possible to grasp the settlement amount of foundation structures such as pile foundations, not just directly on the ground. This makes it possible to grasp the behavior of the entire surrounding area including the support structure 14. Furthermore, it is possible to grasp the relationship between the progress of concrete pouring and the amount of settlement. In particular, if the measurement points P are placed at multiple positions that are spaced apart in a planar manner, the relationship between the concrete pouring location and the amount of settlement can be grasped. Since settlement is measured using a level gauge 18 installed at the measurement point P, it is possible to measure the amount of settlement even if there are support columns or other obstructions in the area to be measured. Furthermore, it eliminates the need to assign personnel specializing in settlement measurement as in the conventional method.

[0029] In the above embodiment, an alarm output means may be further provided to output alarm information or other warnings to the mobile terminal 24 in predetermined cases. In this case, a determination means is provided to determine whether the settlement amount or deformation amount of the support structure 14 exceeds a preset allowable amount, and if it is determined that the calculated settlement amount or deformation amount exceeds the allowable amount, an alarm is output to the mobile terminal 24. For example, 80% of a predetermined planned value may be set as the allowable amount, and an alert may be displayed on the mobile terminal 24 if there is a change that exceeds this allowable amount. By doing so, abnormalities in the deformation amount or settlement amount of the support structure 14 can be detected early, and it becomes possible to quickly take action such as emergency evacuation in the event of an emergency.

[0030] (Examples) Figure 3 shows an example of measurement results displayed on the screens of the mobile terminal 24 and the computing device 22. Figure 3(1) is a conceptual perspective view of the concrete pouring area of ​​the superstructure 12. As shown in this figure, measurement points P (measurement point numbers 1 to 9) are installed at three locations along the longitudinal direction of the pouring area, spaced apart in the short direction: on the starting side, in the middle of the span, and on the ending side. As shown in the legend, the ratio of the measured settlement amount to the planned value is expressed by the type of hatching inside the lower triangular mark representing the measurement point. Specifically, normal hatching is used when the measured settlement amount is within the predetermined allowable range, plain hatching is used when it exceeds 80% of the planned value, and black hatching is used when it exceeds 100% of the planned value. By looking at this display, the relationship between the concrete pouring location and the settlement amount can be easily understood.

[0031] Figure 3(2) is a graph showing an example of the distribution of the change in support structure (average value in the transverse direction) in the longitudinal direction (bridge axis direction) of the concrete placement area. This figure shows lines for the planned value of ground settlement (planned value (ground)), a value equivalent to 80% of the planned value (planned value (80%)), and a value equivalent to 100% of the planned value (planned value (100%)). Furthermore, the change in support structure measured at times corresponding to the progress of concrete placement (9:00, 10:00, 11:00) is shown along with its ratio to the planned value. By looking at this display, the relationship between the progress of concrete placement and the amount of settlement can be easily understood.

[0032] Furthermore, although the above embodiment was described using the case where the structure is a scaffolding as an example, the present invention is not limited to this and may also be applied when measuring the settlement of structures other than scaffolding. In this case as well, the same effects and advantages as described above can be achieved. Also, although the above embodiment was described using the case where the liquid for measurement is water as an example, the present invention is not limited to this and other non-evaporating liquids other than water may be used. In this case as well, the same effects and advantages as described above can be achieved. In addition, the arrangement of the level gauges 18 is not limited to the arrangement shown in Figure 2 and can be changed according to the site conditions.

[0033] As described above, the settlement measurement system according to the present invention is a system for measuring the amount of settlement of a structure installed on the ground or foundation, and comprises a reference tank installed on a reference surface and containing a liquid for measurement, a differential pressure detector installed on the structure and the ground or foundation respectively and outputting the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal, a pressure guiding pipe connecting the reference tank and the differential pressure detector, a calculation means having a settlement amount calculation unit that determines the height difference between the reference surface and the measurement point based on the differential pressure signal from the differential pressure detector and calculates the amount of settlement of the measurement point from a predetermined reference value based on this height difference, and a deformation amount calculation unit that calculates the amount of deformation of the structure due to settlement, and a presentation means that presents the calculation results of the calculation means to the user's terminal in response to a request from the user, so that the amount of settlement of a structure such as a support structure can be grasped in real time.

[0034] Furthermore, according to another settlement measurement system of the present invention, the structure is a support structure installed on the ground or foundation while supporting the superstructure from below, and the measurement points are set near the upper end and lower end of the support structure, respectively, so that the settlement amount of the support structure can be grasped in real time.

[0035] Furthermore, according to another settlement measurement system of the present invention, a determination means for determining whether the calculated deformation amount of the structure exceeds a preset allowable amount, and an alarm output means for outputting an alarm to the user's terminal when the determination means determines that the deformation amount of the structure exceeds the allowable amount, can be detected early if an abnormality occurs in the deformation amount of a structure such as a support structure.

[0036] Furthermore, according to another settlement measurement method of the present invention, a method for measuring the amount of settlement of a structure installed on the ground or foundation comprises the steps of: installing a reference tank containing a liquid for measurement on a reference surface; installing differential pressure detectors at measurement points set on the structure and the ground or foundation, respectively, which output the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal; installing a pressure conductor pipe connecting the reference tank and the differential pressure detector; determining the height difference between the reference surface and the measurement point based on the differential pressure signal from the differential pressure detector; calculating the amount of settlement of the measurement point from a predetermined reference value and the amount of deformation of the structure due to settlement using a calculation means based on this height difference; and presenting the calculation results from the calculation means to the user's terminal in response to a request from the user. Thus, the amount of settlement of a structure such as a support structure can be grasped in real time.

[0037] Furthermore, according to another settlement measurement method of the present invention, the structure is a support structure installed on the ground or foundation while supporting the superstructure from below, and the measurement points are set near the upper end and lower end of the support structure, respectively, so that the settlement amount of the support structure can be grasped in real time.

[0038] Furthermore, according to another settlement measurement method of the present invention, the method further includes the steps of determining whether the calculated deformation amount of the structure exceeds a preset allowable amount, and outputting an alarm to the user's terminal if it is determined that the deformation amount of the structure exceeds the allowable amount. Therefore, abnormalities in the deformation amount of structures such as shoring can be detected early. [Industrial applicability]

[0039] As described above, the settlement measurement system and settlement measurement method according to the present invention are useful, and are particularly suitable for real-time determination of the settlement amount of structures such as scaffolding. [Explanation of Symbols]

[0040] 10. Settlement Measurement System 12 Superstructure 14 Shoring (structure) 16 Standard Tank 18. Level gauge (differential pressure detector) 20 Impulse tube 22 Arithmetic unit 22A Settlement Amount Calculation Unit 22B Deformation Amount Calculation Unit 24 Mobile devices 26. Main beam jack 28 Jack base G Ground P measurement point

Claims

1. A system for supporting a superstructure from below during concrete pouring and measuring the amount of settlement of a support structure installed on the ground or foundation, The system comprises a reference tank installed on a reference surface and containing a liquid for measurement; a plurality of measurement points set at positions spaced apart from each other in the plane near the upper end of the support structure; differential pressure detectors installed at a plurality of measurement points set at positions spaced apart from each other in the plane near the lower end of the support structure and outputting the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal; a pressure guiding pipe connecting the reference tank and the differential pressure detectors; a calculation means having a settlement amount calculation unit that determines the height difference between the reference surface and the measurement points based on the differential pressure signal from the differential pressure detectors and calculates the amount of settlement of the measurement points from a predetermined reference value based on this height difference; a deformation amount calculation unit that calculates the amount of deformation of the support structure due to settlement; and a presentation means that presents the calculation results from the calculation means to the user's terminal in response to a request from the user. The settlement measurement system is characterized in that the presenting means presents a diagram in which the ratio of the settlement amount at the measurement point to the planned value is expressed by the type of mark representing the measurement point, at the position of the measurement point shown in the perspective view representing the concrete pouring area of ​​the superstructure.

2. The settlement measurement system according to claim 1, characterized in that the presenting means presents a distribution map of the settlement amount of the support structure in the longitudinal direction of the concrete pouring area of ​​the superstructure.

3. The settlement measurement system according to claim 1 or 2, further comprising: determination means for determining whether the calculated deformation amount of the support structure exceeds a preset allowable amount; and alarm output means for outputting an alarm to the user's terminal when the determination means determines that the deformation amount of the support structure exceeds the allowable amount.

4. A method for measuring the settlement of a support structure installed on the ground or foundation, which supports the superstructure from below during concrete pouring, The method comprises the steps of: installing a reference tank containing a liquid for measurement on a reference surface; installing a plurality of measurement points set at positions spaced apart from each other in a planar manner near the upper end of the support structure, and installing differential pressure detectors at a plurality of measurement points set at positions spaced apart from each other in a planar manner near the lower end of the support structure, which output the pressure difference between the pressure of the contained liquid and a predetermined reference pressure as a differential pressure signal; installing a pressure guiding pipe connecting the reference tank and the differential pressure detectors; determining the height difference between the reference surface and the measurement points based on the differential pressure signals from the differential pressure detectors, and using a calculation means to calculate the amount of settlement of the measurement points from a predetermined reference value and the amount of deformation of the support structure due to the settlement based on this height difference; and presenting the calculation results from the calculation means to the user's terminal in response to a request from the user. The settlement measurement method is characterized in that the presentation step involves presenting a diagram in which the ratio of the settlement amount at the measurement point to the planned value, at the location of the measurement point shown in the perspective view representing the concrete pouring area of ​​the superstructure, is expressed by the type of mark representing the measurement point.

5. The settlement measurement method according to claim 4, characterized in that the presentation step presents a distribution map of the settlement amount of the support structure in the longitudinal direction of the concrete pouring area of ​​the superstructure.

6. The settlement measurement method according to claim 4 or 5, further comprising the steps of determining whether the calculated deformation amount of the support structure exceeds a preset allowable amount, and outputting an alarm to the user's terminal when it is determined that the deformation amount of the support structure exceeds the allowable amount.

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