CN113834465A - Automatic error calibration device and method for building settlement monitoring - Google Patents
Automatic error calibration device and method for building settlement monitoring Download PDFInfo
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- CN113834465A CN113834465A CN202111428289.3A CN202111428289A CN113834465A CN 113834465 A CN113834465 A CN 113834465A CN 202111428289 A CN202111428289 A CN 202111428289A CN 113834465 A CN113834465 A CN 113834465A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
- G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
Abstract
The invention discloses an automatic error calibration device for building settlement monitoring, which adopts a liquid storage tank, a reference static level gauge and a measuring static level gauge, wherein the liquid storage tank is communicated with the reference static level gauge, and the reference static level gauge is communicated with the measuring static level gauge; liquid is filled in the liquid storage tank, and the density of the liquid is rho; the liquid storage tank is internally provided with a first pressure measuring unit and a second pressure measuring unit, the first pressure measuring unit and the second pressure measuring unit are immersed in liquid, and the height of the first pressure measuring unit from the lower surface of the liquid storage tank is h1The height of the second pressure measuring unit from the lower surface of the liquid storage tank is h2，|h1‑h2|=Δh，Δh>0. By utilizing the method and the device, the influence of the liquid density change and the gravity acceleration change on the settlement monitoring result can be eliminated, and the accuracy of the monitoring result is improved.
Description
Technical Field
The invention relates to the technical field of engineering measurement, in particular to an automatic error calibration device and method for building settlement monitoring.
Background
With the development of economic construction in China and the continuous improvement of the technical level of engineering construction, the construction requirements and quality guarantee of the existing construction engineering are higher and higher, and the automatic monitoring in the aspect of safety cannot be ignored. The differential pressure type static force level gauge utilizes the principle of liquid pressure intensity to measure the settlement between two points and multiple points. According to the principle of liquid pressure, the liquid pressure at each measuring point is different due to different heights of the static level at the measuring points, the liquid height can be converted according to a physical formula F (PS = rho ghS), and the method can be applied to the automatic settlement monitoring of large buildings including roadbeds, subways, deep foundation pits, dams and other structures.
However, in the actual process measurement, due to the changes of atmospheric pressure, humidity, temperature and the like in the working environment conditions, the liquid density ρ and the gravitational acceleration g may be changed, for example, the liquid density ρ may be changed by the factors of the liquid type, temperature, liquid volatilization, liquid deterioration and the like, and the gravitational acceleration may be changed by the factors of different altitudes and different latitudes, while the existing differential hydrostatic level mostly adopts the fixed liquid density value and the fixed gravitational acceleration when calculating the sedimentation value, for example, the density of water is set to 1g/cm3The acceleration of gravity is set to 9.80m/s2This results in a large error between the measurement result and the actual value, a low measurement accuracy, and inability to accurately monitor the settlement and inclination of the building during construction or use, and to ensure the quality of the building and the safety of personnel.
The prior Chinese patent with publication number CN107289906A discloses an automatic monitoring system of a differential pressure type static level, which comprises a field acquisition device, a remote monitoring system and a static level, wherein the static level is connected with the field acquisition device, and the remote monitoring system controls the field acquisition device; the static level comprises a first datum point level arranged on a first datum point, a second datum point level arranged on a second datum point and a measuring point level arranged on a point to be tested, wherein the first datum point and the second datum point are fixed in relative displacement. The monitoring system eliminates the influence of temperature on the water pressure measurement value through the arrangement of two datum points. The scheme is that two static level gauges are used as two datum points (positions without settlement), and the relative displacement of the two datum points is fixed, so that the influence of temperature on the density change of water is eliminated. However, this method has at least the following disadvantages in practical application:
1. the installation of two hydrostatic levels in a non-settling position is time-consuming and labor-consuming, and the relative displacement between the two needs to be determined manually, which can be influenced manually, resulting in a discrepancy from the theoretical settings.
2. In this scheme, increased a set of benchmark hydrostatic level appearance, lead to equipment cost and supplementary material installation cost to increase.
3. In the scheme, only the change of the density of the liquid is considered, and the change of the gravity acceleration is not considered, so that inaccurate factors still exist in the monitoring result.
4. The static level system has the advantages that due to the reasons of field external damage, poor installation and the like, micro leakage or quick leakage occurs, the position of the liquid storage tank is often higher than that of the static level, only when the monitoring data are abnormal due to light leakage of liquid in the static level, the background monitoring system can find the abnormality (data analysis personnel need to observe the data in time), the whole system is in a paralyzed state at the moment, and even wrong settlement early warning can be generated (liquid exists in part of measuring points and no liquid exists in part of measuring points), the monitoring analysis work and construction difficulty is increased, and the service life of the whole system is shortened.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method aims to solve the technical problem that the building settlement monitoring result in the prior art is inaccurate. The invention provides an automatic error calibration device and method for building settlement monitoring, wherein two pressure measuring units with height difference are arranged in a liquid storage tank, so that a product value of liquid density and gravity acceleration can be obtained, the product value is given to a subsequent monitoring system, the influence of external environment change on the liquid density and the gravity acceleration can be eliminated, and the accuracy of a settlement monitoring result is ensured.
The technical scheme adopted by the invention for solving the technical problems is as follows: an automatic error calibration device for building settlement monitoring is characterized in that a liquid storage tank, a reference static level and a measurement static level are adopted, and the automatic error calibration device is used for monitoring the settlement of a buildingThe liquid storage tank is communicated with the reference hydrostatic level which is communicated with the measuring hydrostatic level; liquid is filled in the liquid storage tank, and the density of the liquid is rho; the liquid storage tank is internally provided with a first pressure measuring unit and a second pressure measuring unit, the first pressure measuring unit and the second pressure measuring unit are immersed in liquid, and the distance between the first pressure measuring unit and the lower surface of the liquid storage tank is h1The height of the second pressure measuring unit from the lower surface of the liquid storage tank is h2，|h1-h2|=Δh，Δh>0。
Further, orthographic projections of the first pressure measuring unit and the second pressure measuring unit on the lower surface of the liquid storage box are not overlapped.
Further, the upper surface of the liquid storage tank is stepped and comprises a first upper step surface, a second upper step surface and a third upper step surface, the distance between the first upper step surface and the lower surface of the liquid storage tank is H1, the distance between the second upper step surface and the lower surface of the liquid storage tank is H2, the distance between the third upper step surface and the lower surface of the liquid storage tank is H3, and H1> H2> H3; the first pressure measuring unit is installed on the inner surface of the second upper step surface, and the second pressure measuring unit is installed on the inner surface of the third upper step surface.
Further, the lower surface of the liquid storage tank is in a step shape and comprises a first lower step surface, a second lower step surface and a third lower step surface, the distance between the first lower step surface and the upper surface of the liquid storage tank is H4, the distance between the second lower step surface and the upper surface of the liquid storage tank is H5, the distance between the third lower step surface and the upper surface of the liquid storage tank is H6, and H4> H5> H6; the first pressure measuring unit is installed on the inner surface of the second lower step surface, and the second pressure measuring unit is installed on the inner surface of the third lower step surface.
Furthermore, the upper surface of the liquid storage tank is concave-convex and comprises a first bulge, a second bulge and a third bulge, the distance between the top surface of the first bulge and the lower surface of the liquid storage tank is H7, the distance between the top surface of the second bulge and the lower surface of the liquid storage tank is H8, the distance between the top surface of the third bulge and the lower surface of the liquid storage tank is H9, and H7> H8> H9; the first pressure measuring unit is installed on the inner surface of the top of the second protruding portion, and the second pressure measuring unit is installed on the inner surface of the top of the third protruding portion.
Further, the liquid in the liquid storage tank is water, antifreeze or dimethyl silicone oil.
The error calibration method for building settlement monitoring adopts the automatic error calibration device for building settlement monitoring, and comprises the following steps of:
s1: the method comprises the following steps that a liquid storage tank and a reference static level are arranged at a reference position point, the position of the liquid storage tank is higher than that of the reference static level, a measuring static level is arranged at a position to be measured of a building, and the position of the measuring static level is lower than that of the liquid storage tank; setting the height of liquid in the liquid storage tank as h;
s2: acquiring a first pressure value F1= ρ g (h × h-h) monitored by the first pressure measuring unit in real time1) S, acquiring a second pressure value F2= rho g (h x-h) monitored by the second pressure measuring unit in real time2) S, according to | F1-F2| = | ρ g (h × h)1)S-ρg(h*-h2)S|=ρgS|h2-h1I = ρ gS Δ h to obtain
Wherein S is the stress area, and g is the gravity acceleration of the location of the liquid storage tank;
s3: collecting a third pressure value F3 monitored by the reference hydrostatic level, wherein the liquid level height in the reference hydrostatic level is h3Acquiring a fourth pressure value F4 monitored by the static level gauge, and measuring the liquid level height in the static level gauge as h4Using the ρ g product obtained in step S2, F3-F4= ρ gh3S-ρgh4S=ρgS(h3-h4) To obtain
And measuring the settlement value of the position to be measured of the building relative to the reference position.
Further, in step S2, the ρ g product calculated at the previous time is updated to the ρ g product calculated at the current time, and step S3 is executed.
The automatic error calibration device and the automatic error calibration method for building settlement monitoring have the advantages that the two pressure measuring units are arranged in the liquid storage tank, the pressure difference | F1-F2| output by the two pressure measuring units can be obtained, the height difference Δ h is a known quantity between the two pressure measuring units, the product value of the liquid density ρ and the gravity acceleration g can be calculated by combining the pressure difference | F1-F2| and the height difference Δ h, and the product value is applied to the whole settlement monitoring system, so that the influence of the external environment on settlement value monitoring can be prevented, and the monitoring precision of a differential pressure type static level system is greatly improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic view of a prior art tank configuration.
Fig. 2 is a schematic structural diagram of an automatic error calibration device for building settlement monitoring according to the present invention.
Fig. 3 is a schematic view of a structure of the load cell of the present invention.
Fig. 4 is another structural schematic view of the load cell of the present invention.
Fig. 5 is a schematic view of the first reservoir of the present invention.
Fig. 6 is a schematic view of a second reservoir according to the present invention.
Fig. 7 is a schematic view showing the structure of a third liquid storage tank of the present invention.
Fig. 8 is a flow chart of the method for automatically calibrating the error of building settlement monitoring of the present invention.
In the figure: 1. the liquid storage tank, 2, a reference static level gauge, 3, a measuring static level gauge, 4, a first pressure measuring unit, 5, a second pressure measuring unit, 11, a first upper step surface, 12, a second upper step surface, 13, a third upper step surface, 14, a first lower step surface, 15, a second lower step surface, 16, a third lower step surface, 17, a first bulge part, 18, a second bulge part, 19, a third bulge part, 41, a ceramic shell, 42, a resistance strain sheet, 43, a first electric signal acquisition module, 44, a bridge sensor, 45, a membrane, 46, a second electric signal acquisition module, 47, a sealing protective layer, 48, oil, 49 and a shell.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The static force level gauge is a precise instrument for measuring height difference and change thereof, can be installed on a measuring pier with the same height as a measured object or on the same height line of the wall of the measured object, realizes automatic data acquisition through single-machine version acquisition software arranged in a field acquisition box, stores the data in a field acquisition system, and is connected with the Internet through wired or wireless communication to transmit background software, thereby realizing automatic observation.
Example one
As shown in figure 2, an automatic error calibration device for building settlement monitoring adopts a liquid storage tank 1, a reference hydrostatic level 2 and a measuring hydrostatic level 3, wherein the liquid storage tank 1 is communicated with the reference hydrostatic level 2, and the reference hydrostatic level 2 is communicated with the measuring hydrostatic level 3. The liquid storage tank 1 is filled with liquid, and the density of the liquid is rho. A first pressure measuring unit 4 and a second pressure measuring unit 5 are arranged in the liquid storage tank 1, the first pressure measuring unit 4 and the second pressure measuring unit 5 are immersed in liquid, and the height of the first pressure measuring unit 4 from the lower surface of the liquid storage tank 1 is h1The height of the second pressure measuring unit 5 from the lower surface of the liquid storage tank 1 is h2，|h1-h2|=Δh，Δh>0. In this embodiment, the quantity of liquid reserve tank 1 and benchmark hydrostatic level appearance 2 is one, the quantity of measuring hydrostatic level appearance 3 is a plurality of, adopt communicating pipe to communicate in proper order between a plurality of measuring hydrostatic level appearance 3, one of them measuring hydrostatic level appearance 3 adopts communicating pipe to be linked together with benchmark hydrostatic level appearance 2, benchmark hydrostatic level appearance 2 adopts communicating pipe to be linked together with liquid reserve tank 1, liquid in the liquid reserve tank 1 can flow into in benchmark hydrostatic level appearance 2 and a plurality of measuring hydrostatic level appearance 3 through communicating pipe. The tank 1 and the reference hydrostatic level 2 may be located at a reference location, for example a location where there is no geological settlement. A plurality of measuring hydrostatic levels 3 may be installed at the locations to be measured of the building, and it should be noted that the location of the reference hydrostatic level 2 and the location of the measuring hydrostatic level 3 are both lower than the location of the liquid storage tank 1, but the liquid levels in the liquid storage tank 1, the reference hydrostatic level 2 and the measuring hydrostatic level 3 are maintained at the same level. When a monitoring point is settled, the measuring hydrostatic level is settled, but according to the hydrostatic level principle, the liquid in the measuring hydrostatic level is still kept on the same horizontal plane, but the liquid in the measuring hydrostatic level is still kept on the same horizontal planeThe liquid level height in the static level gauge is changed, and the settlement value of a monitoring point can be calculated by monitoring the change of the liquid level height. However, the existing hydrostatic level monitoring device cannot monitor the change of the liquid density ρ and the gravity acceleration g in the liquid storage tank 1, so that the finally obtained settlement value and the true value have larger error. Therefore, in the present embodiment, the first pressure measuring unit 4 and the second pressure measuring unit 5 are disposed in the liquid storage tank 1 (and the liquid storage tank in the prior art is without a pressure measuring unit, please refer to fig. 1), the first pressure measuring unit 4 and the second pressure measuring unit 5 are respectively installed at different positions in the liquid storage tank 1, and the two have a height difference Δ h. It should be noted that, since the first load cell 4 and the second load cell 5 are installed inside the tank 1 and need to be in contact with the liquid, the size, installation manner, protection level, and the like of the load cell module need to be considered. Since most users do not know the underlying principle of the pressure measuring module at present or have no ability to develop and verify even if the underlying principle is understood, it is not conceivable to install the pressure measuring unit in the tank. In addition, the whole system for monitoring the building settlement relates to the technical fields of mapping, civil engineering, geotechnical engineering, instruments and meters, microelectronics, electromechanics and the like, and has higher requirements on specialization of technical personnel.
In one embodiment, the orthographic projections of the first load cell 4 and the second load cell 5 on the lower surface of the tank 1 are non-overlapping. That is, the installation positions of the first pressure measuring unit 4 and the second pressure measuring unit 5 in the liquid storage tank 1 are staggered in the horizontal direction, so that the two pressure measuring units can be prevented from interfering with each other, and the detection accuracy is improved. The first load cell 4 and the second load cell 5 are water-tight and immersed in the liquid for measuring the liquid pressure at different points in the tank 1. The first pressure measuring unit 4 and the second pressure measuring unit 5 can be in signal connection with a field data acquisition instrument through cables, and the reference hydrostatic level 2 and the measurement hydrostatic level 3 can also be in signal connection with the field data acquisition instrument through cables. The first load cell 4 and the second load cell 5 are preferably identical in structure, and may be, for example, resistive load cells or capacitive load cells. As shown in fig. 3, the resistance type pressure measuring unit includes a ceramic housing 41, a resistance strain gauge 42, and a first electric signal collecting module 43, the resistance strain gauge 42 and the first electric signal collecting module 43 are mounted on the ceramic housing 41, the resistance strain gauge 42 is connected with the first electric signal collecting module 43, when the hydraulic pressure changes, the resistance of the resistance strain gauge 42 changes, and the change of the resistance is processed by the first electric signal collecting module 43 and then output to the field data collector in the form of an electric signal. As shown in fig. 4, the capacitive pressure measuring unit includes a bridge sensor 44, a diaphragm 45, a second electrical signal acquisition module 46, a sealing protection layer 47, oil 48, and a housing 49, where the second electrical signal acquisition module 46 is connected to the bridge sensor 44, an accommodating space is formed between the diaphragm 45 and the sealing protection layer 47 for filling the oil 48, and a part of the bridge sensor 44 is immersed in the oil 48. The diaphragm 45 is an elastic element, and generates corresponding deformation displacement to the pressure difference acting on the two sides thereof, the displacement is in proportion to the pressure difference, the displacement can be received by the bridge sensor 44 and converted into capacitance change, and the capacitance change is transmitted to the electrical signal acquisition module II 46 to be processed and output to the field data acquisition instrument in an electrical signal mode.
In one embodiment, as shown in fig. 5, the upper surface of the liquid storage tank 1 is stepped, and includes a first upper step surface 11, a second upper step surface 12 and a third upper step surface 13, the distance between the first upper step surface 11 and the lower surface of the liquid storage tank 1 is H1, the distance between the second upper step surface 12 and the lower surface of the liquid storage tank 1 is H2, the distance between the third upper step surface 13 and the lower surface of the liquid storage tank 1 is H3, and H1> H2> H3; the first load cell 4 is mounted on the inner surface of the second upper step surface 12, and the second load cell 5 is mounted on the inner surface of the third upper step surface 13. In other words, the height difference Δ H = H2-H3 between the first load cell 4 and the second load cell 5, the size of H2 and H3 can be directly obtained when designing the structural parameters of the tank 1, without additional measurements. Also, the liquid level in the tank 1 is higher than H2 so that the first and second pressure cells 4 and 5 are completely submerged in the liquid, thereby enabling the measurement of pressure values at different liquid level heights in the tank.
In one embodiment, as shown in fig. 6, the lower surface of the liquid storage tank 1 is stepped and includes a first lower step surface 14, a second lower step surface 15 and a third lower step surface 16, the distance between the first lower step surface 14 and the upper surface of the liquid storage tank 1 is H4, the distance between the second lower step surface 15 and the upper surface of the liquid storage tank 1 is H5, the distance between the third lower step surface 16 and the upper surface of the liquid storage tank 1 is H6, and H4> H5> H6; the first load cell 4 is mounted on the inner surface of the second lower step surface 15, and the second load cell 5 is mounted on the inner surface of the third lower step surface 16. In other words, the height difference Δ H = H5-H6 between the first load cell 4 and the second load cell 5, the sizes of H5 and H6 can be directly obtained when designing the structural parameters of the liquid storage tank 1, no additional measurement is needed, and the liquid level in the liquid storage tank 1 is preferably such that the second load cell 5 can be immersed, so that the first load cell 4 and the second load cell 5 can measure pressure values at different liquid level heights in the liquid storage tank.
In an embodiment, as shown in fig. 7, the upper surface of the liquid storage tank 1 is concave-convex, and includes a first protrusion 17, a second protrusion 18 and a third protrusion 19, a distance between a top surface of the first protrusion 17 and the lower surface of the liquid storage tank 1 is H7, a distance between a top surface of the second protrusion 18 and the lower surface of the liquid storage tank 1 is H8, a distance between a top surface of the third protrusion 19 and the lower surface of the liquid storage tank 1 is H9, and H7> H8> H9; the first load cell 4 is mounted on the inner surface of the top of the second boss 18, and the second load cell 5 is mounted on the inner surface of the top of the third boss 19. In other words, the height difference Δ H = H8-H9 between the first load cell 4 and the second load cell 5, the sizes of H8 and H9 can be directly obtained when designing the structural parameters of the tank 1, no additional measurement is required, and the liquid level in the tank 1 is higher than H8, so that the first load cell 4 and the second load cell 5 can be immersed in liquid, and thus pressure values at different liquid level heights in the tank can be measured. The structure (stairstepping and unsmooth form) of above three kinds of liquid reserve tanks 1 can make two pressure cell installation ground more stable to it is obvious with ordinary liquid reserve tank difference in the appearance, easily distinguish when the staff field installation of being convenient for, prevent that installation error from leading to whole monitoring system can't use.
In this embodiment, the liquid in the reservoir 1 may be water, antifreeze, or dimethyl silicone oil, and may be selected as needed. However, the liquid density ρ of the liquid in the tank 1 changes with time due to environmental temperature, humidity, volatilization, and the like. For example, as shown in table 1, the densities of water and antifreeze vary due to temperature changes. Although the density change value is slight, if the sedimentation value is calculated in accordance with the set fixed value, an error occurs in the obtained sedimentation value. And the settlement of geology or buildings can cause the buildings to incline and destroy the stability of the foundation, and if the buildings are close to seaside or river side, the buildings can possibly cause seawater to flow backwards, so that property loss and life threat are caused, and therefore, the accuracy of settlement value monitoring is important for predicting and forecasting the ground settlement work.
TABLE 1
Example two
As shown in fig. 8, the present invention further provides an automatic error calibration method for building settlement monitoring, which specifically includes the following steps.
S1: the method comprises the steps that a liquid storage tank 1 and a reference static level 2 are arranged at a reference position point, the position of the liquid storage tank 1 is higher than the position of the reference static level 2, a measuring static level 3 is arranged at a position to be measured of a building, the position of the measuring static level 3 is lower than the position of the liquid storage tank 1, and the height of liquid in the liquid storage tank 1 is set to be h (h refers to the highest point of the liquid in the liquid storage tank 1).
S2: the first pressure value F1= ρ g (h × h-h) monitored by the first pressure cell 4 is collected in real time1) S, acquiring a second pressure value F2= rho g (h x-h) monitored by the second pressure measuring unit 5 in real time2) S, according to | F1-F2| = | ρ g (h × h)1)S-ρg(h*-h2)S|=ρgS|h2-h1I = ρ gS Δ h to obtain
Wherein S is the stress area, and g is the location of the liquid storage tank 1The acceleration of gravity of (1).
S3: collecting a third pressure value F3 monitored by the reference hydrostatic level 2, wherein the liquid level height in the reference hydrostatic level 2 is h3Acquiring a fourth pressure value F4 monitored by the static level 3, and measuring the liquid level height in the static level 3 to be h4Using the ρ g product obtained in step S2, F3-F4= ρ gh3S-ρgh4S=ρgS(h3-h4) To obtain
And measuring the settlement value of the position to be measured of the building relative to the reference position.
The reference position points at which the tank 1 and the reference hydrostatic level 2 are located are positions at which there is no settlement, and are used as references for comparison. The height of the liquid storage tank 1 is higher than that of the reference hydrostatic level 2 and the measurement hydrostatic level 3, so that the liquid in the liquid storage tank 1 can flow into the hydrostatic level conveniently. The first pressure measuring unit 4 and the second pressure measuring unit 5 are used for acquiring pressure values F1 and F2 of different liquid levels in the liquid storage tank 1 in real time, and F1= rho g (h x-h)1)S，F2=ρg(h*-h2) S, | F1-F2| = ρ gS Δ h, where S is the force-receiving area (a fixed value), g is the gravitational acceleration, and F1, F2, S, and Δ h are all known data, so that one can obtain
. The first pressure measuring unit 4 and the second pressure measuring unit 5 collect the pressure values F1 and F2 in real time, send the pressure values F1 and F2 to the data acquisition instrument on site in real time, and send the data to the background processing software, so that the background processing software can calculate a product value of ρ g in real time, the product value of ρ g calculated at the current moment can replace the product value of ρ g calculated at the previous moment, and then the step S3 is executed. Therefore, when the density of the liquid in the liquid storage tank 1 is changed, or the gravity acceleration is changed, or the density and the gravity acceleration are changed simultaneously, a new rho g product value can be calculated in time, and the new rho g product value is used for subsequent settlement value calculation, so that the settlement can be ensuredThe calculation of the settlement value is not influenced by the density of the liquid and the gravity acceleration, and the accuracy of the settlement value is ensured.
In summary, according to the automatic error calibration device and method for building settlement monitoring of the present invention, two pressure measurement units are installed in the liquid storage tank 1, so that a pressure difference | F1-F2| output by the two pressure measurement units can be obtained, a height difference Δ h exists between the two pressure measurement units, Δ h is a known quantity, a product value of the liquid density ρ and the gravitational acceleration g can be calculated by combining the pressure difference | F1-F2| and the height difference Δ h, and the product value is applied to the whole settlement monitoring system, so that the influence of the external environment on the settlement monitoring can be prevented, and the monitoring accuracy of the differential pressure hydrostatic level system is greatly improved.
In addition, the present invention has the following advantages.
1. The height difference between the pressure measuring units in the liquid storage tank is determined according to the structure of the liquid storage tank, and is not interfered by human factors.
2. The field construction environment is complex, two suitable reference point positions are difficult to find, and the height position between the two reference points is difficult to determine.
3. The pressure measuring unit can monitor the liquid level change of liquid in the liquid storage tank besides providing pressure difference, so as to prevent liquid leakage and the like, or can find the liquid leakage in time when the liquid leakage occurs, so as to remind a worker to replenish liquid in time.
4. The liquid storage tank is arranged at a non-settling position, the pressure measuring unit is arranged in the liquid storage tank, other reference positions do not need to be additionally found, and the working efficiency can be improved; the pressure measuring unit is arranged in the liquid storage tank, can distinguish the difference between abnormal leakage and normal evaporation in time, can monitor abnormal liquid loss at the first time, and can give an early warning in time, so that the system breakdown and failure are avoided, and the whole monitoring system is optimized.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined by the scope of the claims.
Claims (8)
1. An automatic error calibration device for building settlement monitoring is characterized in that a liquid storage tank (1), a reference hydrostatic level (2) and a measurement hydrostatic level (3) are adopted, the liquid storage tank (1) is communicated with the reference hydrostatic level (2), and the reference hydrostatic level (2) is communicated with the measurement hydrostatic level (3); liquid is filled in the liquid storage tank (1), and the density of the liquid is rho; the liquid storage tank is characterized in that a first pressure measuring unit (4) and a second pressure measuring unit (5) are arranged inside the liquid storage tank (1), the first pressure measuring unit (4) and the second pressure measuring unit (5) are immersed in liquid, and the distance between the first pressure measuring unit (4) and the lower surface of the liquid storage tank (1) is h1The height of the second pressure measuring unit (5) from the lower surface of the liquid storage tank (1) is h2，|h1-h2|=Δh，Δh>0。
2. The automatic error calibration device for building settlement monitoring according to claim 1, wherein the orthographic projections of the first load cell (4) and the second load cell (5) on the lower surface of the tank (1) do not overlap.
3. The automatic error calibration device for building settlement monitoring according to claim 2, wherein the upper surface of the tank (1) is stepped and comprises a first upper step surface (11), a second upper step surface (12) and a third upper step surface (13), the first upper step surface (11) is at a distance H1 from the lower surface of the tank (1), the second upper step surface (12) is at a distance H2 from the lower surface of the tank (1), and the third upper step surface (13) is at a distance H3 from the lower surface of the tank (1), H1> H2> H3; the first pressure measuring unit (4) is installed on the inner surface of the second upper step surface (12), and the second pressure measuring unit (5) is installed on the inner surface of the third upper step surface (13).
4. The automatic error calibration device for building settlement monitoring according to claim 2, wherein the lower surface of the tank (1) is stepped and includes a first lower step surface (14), a second lower step surface (15) and a third lower step surface (16), the first lower step surface (14) is at a distance H4 from the upper surface of the tank (1), the second lower step surface (15) is at a distance H5 from the upper surface of the tank (1), and the third lower step surface (16) is at a distance H6 from the upper surface of the tank (1), H4> H5> H6; the first load cell (4) is mounted on an inner surface of the second lower step surface (15), and the second load cell (5) is mounted on an inner surface of the third lower step surface (16).
5. The automatic error calibration device for building settlement monitoring according to claim 2, wherein the upper surface of the liquid storage tank (1) is concave-convex and comprises a first protrusion (17), a second protrusion (18) and a third protrusion (19), the distance between the top surface of the first protrusion (17) and the lower surface of the liquid storage tank (1) is H7, the distance between the top surface of the second protrusion (18) and the lower surface of the liquid storage tank (1) is H8, and the distance between the top surface of the third protrusion (19) and the lower surface of the liquid storage tank (1) is H9, H7> H8> H9; the first load cell (4) is mounted on the inner surface of the top of the second boss (18), and the second load cell (5) is mounted on the inner surface of the top of the third boss (19).
6. The automatic error calibration device for building settlement monitoring according to claim 1, wherein the liquid inside the storage tank (1) is water, antifreeze or simethicone.
7. An error calibration method for building settlement monitoring, which adopts the automatic error calibration device for building settlement monitoring as claimed in any one of claims 1-6, and is characterized by comprising the following steps:
s1: the method comprises the following steps that a liquid storage tank (1) and a reference static level (2) are arranged at a reference position point, the position of the liquid storage tank (1) is higher than the position of the reference static level (2), a measuring static level (3) is arranged at a position to be measured of a building, and the position of the measuring static level (3) is lower than the position of the liquid storage tank (1); setting the height of liquid in the liquid storage tank (1) as h;
s2: acquiring a first pressure value F1= ρ g (h × h-h) monitored by the first pressure measuring unit (4) in real time1) S, acquiring a second pressure value F2= rho g (h x-h) monitored by the second pressure measuring unit (5) in real time2) S, according to | F1-F2| = | ρ g (h × h)1)S-ρg(h*-h2)S|=ρgS|h2-h1I = ρ gS Δ h to obtain
Wherein S is the stress area, and g is the gravity acceleration of the location of the liquid storage tank;
s3: collecting a third pressure value F3 monitored by the reference hydrostatic level (2), wherein the liquid level height in the reference hydrostatic level (2) is h3Acquiring a fourth pressure value F4 monitored by the static level gauge (3), and measuring the liquid level height in the static level gauge (3) to be h4Using the ρ g product obtained in step S2, F3-F4= ρ gh3S-ρgh4S=ρgS(h3-h4) To obtain
And measuring the settlement value of the position to be measured of the building relative to the reference position.
8. The method for calibrating an error in building settlement monitoring according to claim 7, wherein in step S2, the pg product value calculated at the previous time is updated to the pg product value calculated at the current time, and then step S3 is performed.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53109665A (en) * | 1977-03-03 | 1978-09-25 | Rostron Banks Terrence F | Tiltmeter |
| JPH11142146A (en) * | 1997-11-12 | 1999-05-28 | Toa Harbor Works Co Ltd | Underwater level and underwater working method using the same |
| DE10259037A1 (en) * | 2002-12-17 | 2004-07-08 | Still Gmbh | Lifting-height measuring device for warehouse truck, has flexible tube filled with fluid and attached to liftable component of truck, and connected to pressure sensor |
| CN101718543A (en) * | 2009-11-26 | 2010-06-02 | 重庆交通大学 | Device for measuring deflection/ displacement line shape by pressure difference and method thereof |
| CN102927966A (en) * | 2012-10-31 | 2013-02-13 | 清华大学 | Method for improving monitoring accuracy of structural settlement |
| CN107289906A (en) * | 2017-07-03 | 2017-10-24 | 国电南京自动化股份有限公司 | A kind of differential static level automatic monitoring system and its measuring method |
| CN214200139U (en) * | 2020-12-24 | 2021-09-14 | 江西飞尚科技有限公司 | Calibration device for static level |
-
2021
- 2021-11-29 CN CN202111428289.3A patent/CN113834465B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53109665A (en) * | 1977-03-03 | 1978-09-25 | Rostron Banks Terrence F | Tiltmeter |
| JPH11142146A (en) * | 1997-11-12 | 1999-05-28 | Toa Harbor Works Co Ltd | Underwater level and underwater working method using the same |
| DE10259037A1 (en) * | 2002-12-17 | 2004-07-08 | Still Gmbh | Lifting-height measuring device for warehouse truck, has flexible tube filled with fluid and attached to liftable component of truck, and connected to pressure sensor |
| CN101718543A (en) * | 2009-11-26 | 2010-06-02 | 重庆交通大学 | Device for measuring deflection/ displacement line shape by pressure difference and method thereof |
| CN102927966A (en) * | 2012-10-31 | 2013-02-13 | 清华大学 | Method for improving monitoring accuracy of structural settlement |
| CN107289906A (en) * | 2017-07-03 | 2017-10-24 | 国电南京自动化股份有限公司 | A kind of differential static level automatic monitoring system and its measuring method |
| CN214200139U (en) * | 2020-12-24 | 2021-09-14 | 江西飞尚科技有限公司 | Calibration device for static level |
Non-Patent Citations (1)
| Title |
|---|
| 温贤培: "基于液压静力水准仪的综合管廊沉降监测方法研究", 《自动化与仪器仪表》 * |
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