CN108592870B - Real-time monitoring system for surface settlement and uplift and construction method thereof - Google Patents
Real-time monitoring system for surface settlement and uplift and construction method thereof Download PDFInfo
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Abstract
A real-time monitoring system for surface settlement and uplift and a construction method thereof. The system comprises a U-shaped pipe hydraulic sensing device, a pressure conversion and processing system and an electronic display monitoring system; the U-shaped pipe hydraulic induction comprises a plurality of groups of U-shaped pipe hydraulic induction units, and each group of U-shaped pipe hydraulic induction units comprises a starting point device, a pressure transmission pipe and a tail end device; the pressure conversion and processing system comprises an integrated circuit element and a central processing unit; the electronic display monitoring system comprises a command center monitoring screen and a field display screen. In the underground engineering construction process, through the monitoring system which is arranged in advance, construction and management personnel can monitor the results of surface subsidence and uplift visually and in real time through the display screen and adjust the field construction scheme in time, so that the problems that monitoring and measurement cannot be carried out in real time, the monitoring and measurement are easily influenced by weather, the monitoring and measurement are asynchronous with construction, the monitoring result is not visual, non-professional personnel cannot understand easily and the like are solved, and the underground engineering construction method has strong popularization significance in the actual construction process.
Description
Technical Field
The invention belongs to the technical field of civil construction auxiliary equipment, and particularly relates to a real-time monitoring system for surface settlement and uplift and a construction method thereof.
Background
With the acceleration of urbanization in China, the speed of infrastructure construction is gradually increased, more and more newly-built underground projects need to penetrate through existing buildings on the earth surface, and the problem that how to ensure the safety of the existing buildings on the earth surface in the construction and the smooth construction is solved. Shallow-buried underground excavation construction, shield construction, grouting reinforcement construction on the ground surface and jacking crossing construction of pipe jacking engineering of underground engineering all have adverse effects on the stable state of the ground surface to different degrees, and a series of necessary measures are required to be adopted for safety protection in the construction, wherein monitoring and measuring are necessary measures for safety protection. In the past, professional measuring personnel are required for operation in monitoring and measuring construction, and the phenomena that continuous detection cannot be carried out for 24 hours all day, monitoring cannot be carried out in severe weather, monitoring and measuring are asynchronous with a construction site, and a detection result and the actual construction progress have a certain time difference exist. In engineering, cases of safety accidents caused by untimely influence on construction progress due to too many reasons of monitoring and measuring construction and construction without waiting for monitoring and measuring results appear. Therefore, all the engineering construction involving surface subsidence and uplift urgently needs a monitoring system and a construction method which are not influenced by weather, can carry out real-time monitoring 24 hours all day and can visually express monitoring data.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a real-time monitoring system for surface subsidence and uplift and a construction method thereof, which is simple in operation, convenient in use, real-time in monitoring, strong in adaptability and capable of directly displaying the monitoring result.
In order to achieve the aim, the ground surface settlement and uplift real-time monitoring system provided by the invention comprises a U-shaped pipe hydraulic sensing device, a pressure conversion and processing system and an electronic display monitoring system; the U-shaped pipe hydraulic sensing device comprises a plurality of groups of U-shaped pipe hydraulic sensing units, and each group of U-shaped pipe hydraulic sensing units comprises a starting point device, a pressure transmission pipe and a tail end device; the starting device is of a cylindrical steel tank structure with mercury inside, and the starting device in each group of U-shaped pipe hydraulic sensing units is respectively embedded at each monitoring point position on the ground surface within the construction influence range; the tail end device is also of a cylindrical steel tank structure with mercury inside, the bottom of the tail end device is provided with a pressure-sensitive sensing element for sensing pressure change and converting a pressure signal into a current signal, and the pressure-sensitive sensing element is arranged in a safe area outside a construction influence range; the interior of each starting device is communicated with the interior of one tail end device through a soft pressure transmission pipe, so that a U-shaped vacuum closed communication structure is formed, and a height difference exists between the starting device and the tail end device; the pressure conversion and processing system comprises an integrated circuit element and a central processing unit; the integrated circuit element is simultaneously connected with the plurality of pressure-sensitive sensing elements and the central processing unit; the electronic display monitoring system comprises a command center monitoring screen and a field display screen which are connected with the central processing unit.
The U-shaped pipe hydraulic sensing device further comprises hydraulic pipe protection pipelines arranged outside the middle parts of all the pressure transmission pipes, and the hydraulic pipe protection pipelines are made of open-close type hard PVC pipelines.
The U-shaped pipe hydraulic sensing device, the pressure conversion and processing system and the electronic display monitoring system are connected by signal cables.
The top end of the starting device is provided with a first leveling bubble, a first middle vacuum groove is arranged in the starting device, mercury is filled in the first middle vacuum groove, and the lower end of the first middle vacuum groove is connected with a pressure transmission pipe; the top end of the end device is provided with a second leveling bubble, a second middle vacuum groove is arranged in the end device, mercury is filled in the second middle vacuum groove, and the upper end of the second middle vacuum groove is connected with a pressure transmission pipe, so that the first middle vacuum groove of the starting point device is communicated with the second middle vacuum groove of the end device through the pressure transmission pipe.
The pressure-sensitive sensing element is a high-sensitive hydraulic sensing element.
The integrated circuit element is a current intensity sensing circuit and is provided with a plurality of interfaces.
The construction method of the real-time monitoring system for the surface subsidence and uplift provided by the invention comprises the following steps in sequence:
1) firstly, determining the number of U-shaped pipe hydraulic induction units required by construction by workers according to actual conditions on site;
2) through field tests, under a certain height difference, under the condition that the height difference changes by 0.1mm, the corresponding pressure change of the pressure sensitive sensing element and the change rule of the pressure digital signal of the integrated circuit element are found out by the starting point device and the tail end device, a correction equation is determined, then the correction equation is input into a central processing unit for storage, a plurality of tests are carried out, data are recorded, and the correction equation is repeatedly verified until the test is finished;
3) determining a construction protection building and a corresponding construction influence range according to the actual condition of a construction site, and then determining a plurality of scattered monitoring point positions at the earth surface within the construction influence range according to the standard requirements; then, setting a safety region outside the construction influence range, and intensively setting a plurality of end devices, integrated circuit elements and a central processing unit;
4) planning all lines of the pressure transmission pipes and regions for intensively entering the hydraulic pipe protection pipelines;
5) numbering starting devices in the U-shaped pipe hydraulic sensing units at corresponding positions according to the sequence of monitoring points, then placing or embedding the starting devices with corresponding numbers at the corresponding monitoring points according to requirements, ensuring the placing verticality of the starting devices by adjusting the first level bubble in a centered mode during placing or embedding, and protecting the starting devices by taking measures of additionally arranging a protective cover;
6) putting the pressure transmission pipes in each group of U-shaped pipe hydraulic sensing units according to a planned line, tidying, and finally putting the pressure transmission pipes in a hydraulic pipe protection pipeline in a specified area for protection;
7) the tail end devices in each group of U-shaped pipe hydraulic sensing units are sequentially numbered and centrally arranged in a safety area, and the arrangement verticality of the tail end devices is guaranteed by adjusting the second level bubble in the middle;
8) connecting a pressure-sensitive sensing element at the bottom of the end device with an integrated circuit element through a signal cable, and numbering interfaces on the integrated circuit element according to the position sequence of monitoring points;
9) collecting data including on-site height difference, spacing and temperature to form on-site technical parameters;
10) connecting the integrated circuit element to a central processing unit, inputting the field technical parameters into the central processing unit, and starting a correction program to perform zeroing correction;
11) the central processing unit automatically records the current relative high difference value, sets the current state to be the initial state, outputs a digital display signal of 0, and the surface of the earth is raised to be plus and sunk to be minus, and the engineering precision is determined according to the actual situation on site; setting an elevation change early warning value;
12) connecting a central processing unit with a monitoring screen of a command center and a field display screen through a signal cable;
13) during construction, if a certain part of the ground surface rises, the position of a starting point device arranged at the position will rise along with the rising, and then part of mercury in a first intermediate vacuum groove on the rising point device will flow into a second intermediate vacuum groove of a terminal device through a corresponding pressure transmission pipe, so that greater pressure is applied to a pressure-sensitive sensing element, the pressure-sensitive sensing element can immediately detect the pressure change, and the pressure change value is converted into a current signal and then transmitted to an integrated circuit element; the process of the ground surface sinking is opposite;
14) the integrated circuit element converts the current signal output by the pressure-sensitive sensing element into a photoelectric signal which can be identified by the central processing unit and then transmits the photoelectric signal to the central processing unit; then the central processing unit converts the photoelectric signal output by the integrated circuit element into a digital signal and transmits the digital signal to a command center monitoring screen and a field display screen in an electronic display monitoring system for displaying, and managers and field construction personnel can directly read the relative elevation difference displayed on the command center monitoring screen and the field display screen to determine the actual field surface uplift or settlement value and monitor the influence of construction on the surface elevation in real time;
15) when the relative elevation difference of the rise or the subsidence of the earth surface exceeds the elevation change early warning value, the central processing unit automatically gives an alarm;
16) after the construction is finished, the monitoring system is dismantled and cleaned up for the next use.
According to the real-time monitoring system for the ground surface settlement and the ground surface uplift and the construction method thereof, through the monitoring system which is arranged in advance, constructors and managers can monitor the ground surface settlement and the ground surface uplift results visually and in real time through the display screen and adjust the field construction scheme in time, the problems that monitoring and measurement cannot be carried out in real time, the monitoring and measurement are easily affected by weather, the monitoring and measurement are asynchronous with the construction, the monitoring results are not visual, non-professional personnel cannot understand easily and the like are solved, and the real-time monitoring system has strong popularization significance in the actual construction process.
Drawings
Fig. 1 is a schematic perspective view of a system for real-time monitoring of surface subsidence and uplift provided by the present invention.
Fig. 2 is a detailed schematic diagram of a single U-tube hydraulic device provided by the present invention.
Detailed Description
The present invention provides a real-time monitoring system for ground subsidence and uplift and a construction method thereof, which are described in detail below with reference to the accompanying drawings and specific embodiments.
The following description will be given by taking a station project under a certain sewage pipeline as an example: this engineering is the pipe jacking engineering, and wherein the railway station is the key protection historical relic in city, and the pipe jacking construction will influence the structural stability of the old station room in railway station, need carry out the slip casting to the old station room ground of railway station during the construction and consolidate, must take the control measure to it simultaneously in order to ensure the old station room stable in structure in railway station. Under the conditions of tight construction period and heavy tasks, the system is adopted for monitoring and measuring during pipe jacking construction, 24-hour uninterrupted monitoring throughout the day is effectively implemented, the influence of severe weather on monitoring and measuring is reduced, the construction continuity is ensured, and the safety of an old station house structure is ensured.
As shown in fig. 1 and 2, the real-time monitoring system for ground surface settlement and uplift provided by the invention comprises a U-shaped pipe hydraulic sensing device 1, a pressure conversion and processing system 2 and an electronic display monitoring system 3; the U-shaped pipe hydraulic sensing device 1 comprises a plurality of groups of U-shaped pipe hydraulic sensing units, and each group of U-shaped pipe hydraulic sensing units comprises a starting point device 4, a pressure transmission pipe 5 and a tail end device 7; the starting device 4 is a cylindrical steel tank structure with mercury inside, and the starting device 4 in each group of U-shaped pipe hydraulic sensing units is respectively embedded at each monitoring point position on the ground surface 19 within the construction influence range; the tail end device 7 is also of a cylindrical steel tank structure with mercury inside, the bottom of the tail end device is provided with a pressure-sensitive sensing element 18 for sensing pressure change and converting a pressure signal into a current signal, and the pressure-sensitive sensing element is arranged in a safe area outside a construction influence range; the interior of each starting device 4 is communicated with the interior of a tail end device 7 through a soft pressure transmission pipe 5, so that a U-shaped vacuum closed communication structure is formed, and a height difference exists between the starting device 4 and the tail end device 7; the pressure conversion and processing system 2 comprises an integrated circuit element 8 and a central processing unit 9; the integrated circuit element 8 is simultaneously connected with the pressure-sensitive sensing elements 18 and the central processing unit 9 and is used for converting current signals output by the pressure-sensitive sensing elements 18 into photoelectric signals which can be identified by the central processing unit 9; the central processing unit 9 is used for converting the photoelectric signal output by the integrated circuit element 8 into a digital signal, then transmitting the digital signal to the electronic display monitoring system 3 for displaying, and automatically giving an alarm when the ground surface rises or sinks beyond an early warning value; the electronic display monitoring system 3 comprises a command center monitoring screen 10 and a field display screen 11 which are connected with the central processing unit 9, and is used for receiving signals output by the central processing unit 9, displaying the current elevation value of the earth surface 18, monitoring the field construction condition and guiding the construction process.
The U-shaped pipe hydraulic sensing device 1 further comprises hydraulic pipe protection pipelines 6 arranged outside the middle parts of all the pressure transmission pipes 5, and the hydraulic pipe protection pipelines 6 are made of open-close type hard PVC pipelines and used for protecting the soft pressure transmission pipes 5.
The U-shaped tube hydraulic sensing device 1, the pressure conversion and processing system 2 and the electronic display monitoring system 3 are connected by a signal cable 20.
The top end of the starting device 4 is provided with a first leveling bubble 14, a first intermediate vacuum groove 15 is arranged in the starting device, mercury is filled in the first intermediate vacuum groove 15, and the lower end of the first intermediate vacuum groove is connected with the pressure transmission pipe 5; the end device 7 has a second leveling bubble 16 at the top end, a second intermediate vacuum tank 17 is provided inside, mercury is filled in the second intermediate vacuum tank 17, and the pressure transfer tube 5 is connected to the upper end, whereby the first intermediate vacuum tank 15 of the starting device 4 and the second intermediate vacuum tank 17 of the end device 7 are communicated with each other through the pressure transfer tube 5.
The pressure sensitive sensing element 18 is a highly sensitive hydraulic sensing element.
The integrated circuit element 8 is a current intensity sensing circuit having a plurality of interfaces, and thus can process a plurality of sets of electrical signal data simultaneously.
The construction method of the real-time monitoring system for surface subsidence and uplift provided by the invention is described as follows by combining with an engineering example:
1) firstly, determining the number of U-shaped pipe hydraulic induction units required by construction according to the actual situation of a site by workers, wherein the number of the U-shaped pipe hydraulic induction units is 30 in the embodiment, and a space for expansion with heat and contraction with cold is reserved in a U-shaped vacuum closed communication structure;
2) through field tests, under a certain height difference, the pressure change of the pressure sensitive sensing element 18 and the change rule of the pressure digital signal of the integrated circuit element 8 are found out correspondingly under the condition that the height difference of the starting point device 4 and the tail end device 7 is changed by 0.1mm, a correction equation is determined, then the correction equation is input into the central processing unit 9 for storage, a plurality of tests are carried out, data are recorded, and the correction equation is repeatedly verified until the test is finished;
3) determining a construction protection building 13 and a corresponding construction influence range according to the actual condition of a construction site, and then determining a plurality of scattered monitoring point positions, namely 30 monitoring point positions in the invention, at the earth surface 19 within the construction influence range according to the specification requirement; then, setting a position 20m out of the construction influence range as a safe area, and intensively setting a plurality of terminal devices 7, integrated circuit elements 8 and a central processing unit 9;
4) planning all lines of the pressure transmission pipes 5 and regions for intensively entering the hydraulic pipe protection pipelines 6;
5) numbering starting point devices 4 in the U-shaped pipe hydraulic sensing units at corresponding positions according to the monitoring point sequence, then placing or embedding the starting point devices 4 with corresponding numbers at the corresponding monitoring point positions according to requirements, ensuring the placement verticality of the starting point devices 4 by adjusting the centering mode of the first level bubbles 14 during placement or embedding, and protecting the starting point devices 4 by adopting a measure of additionally arranging a protective cover;
6) putting the pressure transmission pipes 5 in each group of U-shaped pipe hydraulic sensing units according to a planned line, tidying, and finally putting the pressure transmission pipes into a hydraulic pipe protection pipeline 6 in a specified area for protection;
7) the tail end devices 7 in each group of U-shaped pipe hydraulic sensing units are sequentially numbered and centrally placed in a safety area, and the placement verticality of the tail end devices 7 is guaranteed by adjusting the second leveling bubble 16 to be centered;
8) connecting a pressure-sensitive sensing element 18 at the bottom of the end device 7 with the integrated circuit element 8 through a signal cable 20, and numbering interfaces on the integrated circuit element 8 according to the position sequence of monitoring points;
9) collecting data including on-site height difference, spacing and temperature to form on-site technical parameters;
10) connecting the integrated circuit element 8 to a central processing unit 9, inputting the field technical parameters into the central processing unit 9, and starting a correction program to perform zeroing correction;
11) the central processing unit 9 automatically records the current relative height difference, which is 0.2m in the embodiment, sets the current state as the initial state, outputs a digital display signal of 0, and the earth surface 19 rises to plus and sinks to minus, the engineering precision is determined according to the actual situation on site, which is 0.3mm in the embodiment; setting an elevation change early warning value, which is 2mm in the embodiment;
12) the central processing unit 9 is connected with a command center monitoring screen 10 and a field display screen 11 through a signal cable 20, so that managers and field constructors can intuitively control the construction state;
13) during construction, if a certain part of the ground surface 19 is raised, the position of the starting point device 4 arranged at the position is raised, and part of mercury in the first intermediate vacuum groove 15 on the ground surface flows into the second intermediate vacuum groove 17 of the end device 7 through the corresponding pressure transmission pipe 5, so that a larger pressure is applied to the pressure-sensitive sensing element 18, the pressure-sensitive sensing element 18 can immediately detect the pressure change, and the pressure change value is converted into a current signal and transmitted to the integrated circuit element 8; the process of subsidence occurring in the earth's surface 19 is reversed;
14) the integrated circuit element 8 converts the current signal output by the pressure-sensitive sensing element 18 into a photoelectric signal which can be identified by the central processing unit 9 and then transmits the photoelectric signal to the central processing unit 9; then the central processor 9 converts the photoelectric signal output by the integrated circuit element 8 into a digital signal, and transmits the digital signal to a command center monitoring screen 10 and a field display screen 11 in the electronic display monitoring system 3 for displaying, and managers and field construction personnel can directly read the relative elevation difference displayed on the command center monitoring screen 10 and the field display screen 11 to determine the actual field surface 19 uplift or settlement value, and monitor the influence of construction on the surface 19 elevation in real time;
15) when the relative elevation difference of the rise or the subsidence of the earth surface 19 exceeds the elevation change early warning value, the central processing unit 9 automatically gives an alarm;
16) after the construction is finished, the monitoring system is dismantled and cleaned up for the next use.
Claims (1)
1. A construction method of a ground settlement and uplift real-time monitoring system comprises a U-shaped pipe hydraulic sensing device (1), a pressure conversion and processing system (2) and an electronic display monitoring system (3); the U-shaped pipe hydraulic sensing device (1) comprises a plurality of groups of U-shaped pipe hydraulic sensing units, and each group of U-shaped pipe hydraulic sensing units comprises a starting point device (4), a pressure transmission pipe (5) and a tail end device (7); the starting device (4) is of a cylindrical steel tank structure with mercury inside, and the starting device (4) in each group of U-shaped pipe hydraulic sensing units is respectively embedded at each monitoring point position on the earth surface (19) within the construction influence range; the tail end device (7) is also of a cylindrical steel tank structure with mercury inside, the bottom of the tail end device is provided with a pressure-sensitive sensing element (18) for sensing pressure change and converting a pressure signal into a current signal, and the tail end device is arranged in a safe area outside a construction influence range; the interior of each starting device (4) is communicated with the interior of one end device (7) through a soft pressure transmission pipe (5), so that a U-shaped vacuum closed communication structure is formed, and a height difference exists between the starting device (4) and the end device (7); the pressure conversion and processing system (2) comprises an integrated circuit element (8) and a central processing unit (9); wherein the integrated circuit element (8) is simultaneously connected with a plurality of pressure sensitive sensing elements (18) and the central processor (9); the electronic display monitoring system (3) comprises a command center monitoring screen (10) and a field display screen (11) which are connected with the central processing unit (9);
the top end of the starting point device (4) is provided with a first leveling bubble (14), a first middle vacuum groove (15) is arranged in the starting point device, mercury is filled in the first middle vacuum groove (15), and the lower end of the first middle vacuum groove is connected with a pressure transmission pipe (5); the top end of the tail end device (7) is provided with a second leveling bubble (16), a second middle vacuum groove (17) is arranged in the tail end device, mercury is filled in the second middle vacuum groove (17), the upper end of the second middle vacuum groove is connected with the pressure transmission pipe (5), and therefore the first middle vacuum groove (15) of the starting point device (4) is communicated with the second middle vacuum groove (17) of the tail end device (7) through the pressure transmission pipe (5);
the method is characterized in that: the construction method comprises the following steps in sequence:
1) firstly, determining the number of U-shaped pipe hydraulic induction units required by construction by workers according to actual conditions on site;
2) through field tests, under a certain height difference, the pressure change of a corresponding pressure-sensitive sensing element (18) and the change rule of a pressure digital signal of an integrated circuit element (8) are found out under the condition that the height difference of a starting point device (4) and a tail end device (7) is changed by 0.1mm, a correction equation is determined, then the correction equation is input into a central processing unit (9) for storage, a plurality of tests are carried out, data are recorded, and the correction equation is repeatedly verified until the test is finished;
3) determining a construction protection building (13) and a corresponding construction influence range according to the actual condition of a construction site, and then determining a plurality of scattered monitoring point positions at the earth surface (19) within the construction influence range according to the standard requirements; then, setting a safety region outside the construction influence range, and intensively setting a plurality of terminal devices (7), integrated circuit elements (8) and a central processing unit (9);
4) planning all lines of the pressure transmission pipes (5) and regions for intensively entering the hydraulic pipe protection pipelines (6);
5) numbering starting point devices (4) in the U-shaped pipe hydraulic sensing units at corresponding positions according to the sequence of monitoring points, then placing or embedding the starting point devices (4) with corresponding numbers at the corresponding monitoring points as required, ensuring the placing verticality of the starting point devices (4) by adjusting the centering mode of a first leveling bubble (14) during placing or embedding, and protecting the starting point devices (4) by adopting a measure of additionally arranging a protective cover;
6) putting the pressure transmission pipes (5) in each group of U-shaped pipe hydraulic sensing units according to a planned line, tidying, and finally putting the pressure transmission pipes into a hydraulic pipe protection pipeline (6) in a specified area for protection;
7) numbering and intensively arranging the tail end devices (7) in each group of U-shaped pipe hydraulic sensing units in a safety area in sequence, and ensuring the arrangement verticality of the tail end devices (7) by adjusting the centering mode of second leveling air bubbles (16);
8) connecting a pressure-sensitive sensing element (18) at the bottom of the end device (7) with the integrated circuit element (8) through a signal cable (20), and numbering interfaces on the integrated circuit element (8) according to the position sequence of the monitoring points;
9) collecting data including on-site height difference, spacing and temperature to form on-site technical parameters;
10) connecting the integrated circuit element (8) to a central processing unit (9), inputting the field technical parameters into the central processing unit (9), and starting a correction program to perform zeroing correction;
11) the central processing unit (9) automatically records the current relative height difference value, sets the current state to be the initial state, outputs a digital display signal of 0, and ensures that the earth surface (19) is raised to be plus and sunk to be minus and the engineering precision is determined according to the actual situation on site; setting an elevation change early warning value;
12) the central processing unit (9) is connected with a monitoring screen (10) of a command center and a field display screen (11) through a signal cable (20);
13) during construction, if a certain part of the ground surface (19) rises, the position of the starting point device (4) arranged at the position rises along with the rising, and then part of mercury in the first intermediate vacuum groove (15) on the starting point device flows into the second intermediate vacuum groove (17) of the end device (7) through the corresponding pressure transmission pipe (5), so that a larger pressure is applied to the pressure-sensitive sensing element (18), and the pressure-sensitive sensing element (18) can immediately detect the pressure change and convert the pressure change value into a current signal and transmit the current signal to the integrated circuit element (8); the process of the ground surface (19) sinking is reversed;
14) the integrated circuit element (8) converts the current signal output by the pressure-sensitive sensing element (18) into a photoelectric signal which can be identified by the central processing unit (9) and then transmits the photoelectric signal to the central processing unit (9); then the central processing unit (9) converts the photoelectric signal output by the integrated circuit element (8) into a digital signal, and transmits the digital signal to a command center monitoring screen (10) and a field display screen (11) in the electronic display monitoring system (3) for displaying, and managers and field constructors can directly read the relative height difference displayed on the command center monitoring screen (10) and the field display screen (11) to determine the actual uplift or settlement value of the ground surface (19) on site, and monitor the influence of construction on the height of the ground surface (19) in real time;
15) when the relative elevation difference of the rise or the subsidence of the earth surface (19) exceeds the elevation change early warning value, the central processing unit (9) automatically gives an alarm;
16) after the construction is finished, the monitoring system is dismantled and cleaned up for the next use.
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| CN108592870A (en) | 2018-09-28 |
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