CN114809123A - Multi-stage support foundation pit monitoring method - Google Patents
Multi-stage support foundation pit monitoring method Download PDFInfo
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- CN114809123A CN114809123A CN202210346859.2A CN202210346859A CN114809123A CN 114809123 A CN114809123 A CN 114809123A CN 202210346859 A CN202210346859 A CN 202210346859A CN 114809123 A CN114809123 A CN 114809123A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B3/00—Methods or installations for obtaining or collecting drinking water or tap water
- E03B3/32—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river
- E03B3/34—Methods or installations for obtaining or collecting drinking water or tap water with artificial enrichment, e.g. by adding water from a pond or a river of underground water
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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Abstract
The application relates to a method for monitoring a multi-stage support foundation pit, which relates to the technical field of foundation pit construction and comprises the following steps: installing a water level pipeline: vertically inserting a plurality of water level pipelines outside the foundation pit, wherein the top of each water level pipeline is of a closed structure; installing an overflow pipeline: the overflow pipelines are arranged and correspond to the water level pipelines one by one, the overflow pipelines are vertically arranged on one side of the water level pipelines, and the bottoms of the overflow pipelines are of closed structures; installing a first communicating pipeline: the first communication pipeline is arranged between the water level pipeline and the overflow pipeline, the first communication pipeline is communicated with the inside of the water level pipeline and the inside of the overflow pipeline, and a one-way valve is arranged on the first communication pipeline; installing an inflation assembly: and installing an inflating assembly on the top surface of the water level pipeline, wherein the inflating assembly is used for inflating the inside of the water level pipeline. The treatment effect of groundwater can be improved.
Description
Technical Field
The application relates to the technical field of foundation pit construction, in particular to a multi-stage support foundation pit monitoring method.
Background
The foundation pit monitoring is an important link in foundation pit construction, and means that in the process of foundation pit excavation and underground engineering construction, various observation and analysis works are carried out on the characteristics of the foundation pit, the displacement of a supporting structure and the change of surrounding environment conditions, the monitoring result is fed back in time, the deformation and the development of a stable state which are caused after further construction are predicted, the degree of influence of the construction on the surrounding environment is judged according to the prediction, the design and the construction are guided, and the information construction is realized.
In the foundation ditch monitoring process, need carry out real-time detection to the water level of groundwater to guarantee that foundation ditch construction can normally go on, when groundwater level is lower, be favorable to the normal clear of foundation ditch construction, when groundwater level is higher, need extract groundwater, make groundwater arrive suitable position, and then make foundation ditch construction can normally go on.
Among the above-mentioned foundation ditch monitoring process, need set up solitary equipment and detect groundwater, when adjusting groundwater level simultaneously, need use the water pump to extract groundwater, the distribution structure of groundwater may be destroyed to the mode of this kind of external force forced extraction, and then arouse the earth's surface to subside, when examining groundwater level simultaneously, the deviation can take place, leads to the water pump can't normally extract work to the offal to lead to groundwater to produce the interference to the foundation ditch construction.
Disclosure of Invention
In order to improve the treatment effect of underground water, the application provides a multi-stage support foundation pit monitoring method.
The application provides a multistage support foundation pit monitoring method, adopts following technical scheme:
a multi-stage supporting foundation pit monitoring method comprises the following steps:
installing a water level pipeline: vertically inserting a plurality of water level pipelines outside the foundation pit, wherein the top of each water level pipeline is of a closed structure;
installing an overflow pipeline: the overflow pipelines are arranged and correspond to the water level pipelines one by one, the overflow pipelines are vertically arranged on one side of the water level pipelines, and the bottoms of the overflow pipelines are of closed structures;
installing a first communicating pipeline: the first communication pipeline is arranged between the water level pipeline and the overflow pipeline and is communicated with the inside of the water level pipeline and the inside of the overflow pipeline;
installing a one-way valve: installing a one-way valve on the first communication pipeline;
installing an inflation assembly: and installing an inflating assembly on the top surface of the water level pipeline, wherein the inflating assembly is used for inflating the inside of the water level pipeline.
Through adopting above-mentioned technical scheme, when the groundwater liquid level in the water level pipeline surpassed the height of first communicating pipe, groundwater can get into in the overflow pipeline through first communicating pipe, the liquid level of groundwater is the same with the liquid level of groundwater in the water level pipeline in the overflow pipeline, aerify the subassembly and continuously aerify water level pipeline inside, make the pressure in the water level pipeline increase, and then make groundwater in the water level pipeline can continuously flow in the overflow pipeline, and stabilize the liquid level of groundwater in the water level pipeline in first communicating pipe department, the regulation to the groundwater liquid level has been accomplished under the condition of avoiding carrying out real-time supervision to groundwater, avoid adopting the mode of external force extraction to adjust the water level of groundwater simultaneously, thereby the treatment effect of groundwater has been improved.
Optionally, a filtering membrane is horizontally arranged in the water level pipeline, the filtering membrane is located above the first communicating pipeline, the filtering membrane is made of a breathable but waterproof flexible material, and the edge of the filtering membrane is fixedly connected with the water level pipeline.
Through adopting above-mentioned technical scheme, groundwater in the water level pipeline lasts under the condition that increases, during groundwater liquid level in groundwater liquid level pipeline and the groundwater liquid level box in the overflow pipeline, need start aeration equipment to the inside pressurization of water level pipeline, in-process that aeration equipment started, groundwater liquid level in the water level pipeline may surpass first communicating pipe department, the groundwater that surpasss first communicating pipe this moment may lead to the fact the influence to the foundation ditch construction, filterable membrane's setting can avoid groundwater liquid level in the water level pipeline to surpass first communicating pipe, simultaneously can not influence aeration equipment's inflation work, thereby further improved the treatment effect of groundwater.
Optionally, overflow pipe internal fixation is provided with first level sensor, and first level sensor is located the overflow pipe top, and first level sensor is used for detecting the liquid level information in the overflow pipe to the liquid level signal that the transmission corresponds, first level sensor is connected with the controller, and the controller is responded to the liquid level signal and is controlled the operating condition who aerifys the subassembly.
Through adopting above-mentioned technical scheme, first level sensor detects the groundwater liquid level in the overflow pipe, and groundwater liquid level in the overflow pipe is the same with the groundwater liquid level in the water level pipe, and first level sensor converts the liquid level information that detects into level signal and transmission control ware, and the controller is responded to level signal and is controlled aeration component and work for aeration component pressurizes water level pipe inside, avoids aeration component to be in the on-state all the time, thereby has improved the practicality of multi-stage support foundation ditch monitoring method.
Optionally, install the second liquid level sensor in the water level pipeline, the second liquid level sensor is located the filtration membrane top, and is connected with the controller, and the second liquid level sensor is used for detecting the displacement information in the middle of the filtration membrane to transmit corresponding displacement signal, the controller responds to displacement signal and controls the operating condition of inflatable component.
Through adopting above-mentioned technical scheme, groundwater in the water level pipeline lasts under the condition that increases, groundwater in the water level pipeline may produce the extrusion to filtration membrane, make filtration membrane middle part fluctuate, the second liquid level sensor reflects filtration membrane's undulant condition through the displacement information that detects in the middle of the filtration membrane, the controller responds to displacement signal and further controls inflatable component's operating condition, make filtration membrane resume initial condition, avoid filtration membrane transition fluctuation to produce the damage, groundwater in the water level pipeline can be better gets into in the overflow pipeline this moment, thereby the practicality of multi-stage support foundation ditch monitoring method has been improved, the treatment effect of groundwater has further been improved simultaneously.
Optionally, a second communicating pipeline is arranged below the first communicating pipeline, the second communicating pipeline is communicated with the inside of the water level pipeline and the inside of the overflow pipeline, and a valve is installed on the second communicating pipeline.
By adopting the technical scheme, after the foundation pit construction is completed, a constructor can return part of underground water to the underground through the second communication pipeline according to actual working conditions, so that the construction environment is restored to a certain degree, and the protection of the multi-stage support foundation pit monitoring method to the construction environment is improved.
Optionally, the second liquid level sensor is further configured to detect liquid level information in the water level pipeline and transmit a corresponding liquid level signal, the controller is connected to the valve, and the controller responds to the liquid level signal and controls a working state of the valve.
Through adopting above-mentioned technical scheme, when the groundwater liquid level in the water level pipeline reduces under the influence of other factors, the large amplitude variation of groundwater liquid level can lead to the foundation ditch surface to take place to subside the phenomenon, the second liquid level sensor can detect the liquid level information in the water level pipeline, when the second liquid level sensor detects groundwater liquid level and reduces, the liquid level signal that passes out corresponds, the controller is opened in response to corresponding liquid level signal and control flap, make groundwater in the overflow pipeline can flow back to the underground, make the range of change of groundwater liquid level reduce, and then make the foundation ditch surface take place to subside the possibility reduce, thereby the treatment effect of groundwater has further been improved.
Optionally, a display screen is arranged on the water level pipeline, the display screen is connected with the first liquid level sensor and the second liquid level sensor, and the display screen is used for displaying information detected by the first liquid level sensor and the second liquid level sensor in real time.
Through adopting above-mentioned technical scheme, the setting up of display screen can help the constructor to know the liquid level condition of groundwater, and the constructor of being convenient for judges the construction environment to the practicality of multistage support foundation ditch monitoring methods has further been improved.
Optionally, an alarm is arranged on the water level pipeline, the alarm is connected with the controller, and the controller responds to the liquid level signal transmitted by the second liquid level sensor and controls the alarm to give an alarm.
Through adopting above-mentioned technical scheme, when the liquid level of groundwater reduced, the large amplitude variation of groundwater liquid level probably leads to the foundation ditch surface to take place to subside the phenomenon, second liquid level sensor can detect the groundwater liquid level in the water level pipeline this moment, make the controller respond to liquid level signal and control the siren and send out the police dispatch newspaper, the constructor of being convenient for in time learns the circumstances that the groundwater liquid level reduced, make the constructor can judge whether to continue to be under construction according to actual conditions, thereby the protection of multistage support foundation ditch monitoring method to constructor construction safety has been improved.
In summary, the present application includes at least one of the following beneficial technical effects:
by arranging the water level pipeline, the overflow pipeline, the first communicating pipeline and the inflating assembly, the adjustment of the liquid level of the underground water is finished under the condition of avoiding real-time monitoring of the underground water, and meanwhile, the adjustment of the water level of the underground water in an external force pumping mode is avoided, so that the treatment effect of the underground water is improved;
by arranging the filtering membrane, the arrangement of the filtering membrane can prevent the groundwater liquid level in the water level pipeline from exceeding the first communicating pipeline, and meanwhile, the aeration work of the aeration component cannot be influenced, so that the treatment effect of groundwater is further improved;
through setting up second intercommunication pipeline for groundwater in the overflow pipeline can flow back to the underground, makes the range of variation of groundwater liquid level reduce, and then makes the foundation ditch surface take place the possibility that subsides and reduce, thereby has further improved the treatment effect of groundwater.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present application;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a cross-sectional view of an embodiment of the present application;
FIG. 4 is an enlarged view of a portion of FIG. 3 at B;
fig. 5 is a partially enlarged view at C in fig. 3.
Description of reference numerals: 0. a foundation pit; 1. a display screen; 2. a water level pipe; 21. a filtration membrane; 3. an overflow conduit; 4. a first communicating pipe; 41. a one-way valve; 5. a second communicating conduit; 51. a valve; 6. a first liquid level sensor; 7. a second liquid level sensor; 8. a controller; 9. an inflation assembly; 91. an air pump; 92. an exhaust pipe; 10. an alarm.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a method for monitoring a multi-stage support foundation pit. The method for monitoring the multi-stage support foundation pit comprises the following steps:
installing a water level pipeline 2:
referring to fig. 1 and 2, a plurality of water level pipelines 2 are arranged along the circumferential direction of a foundation pit 0, the cross sections of the water level pipelines 2 are circular, the top of each water level pipeline 2 is of a closed structure, the water level pipelines 2 are vertically inserted outside the foundation pit 0, and the bottom ends of the water level pipelines 2 are located at underground shallow groundwater; referring to fig. 3 and 4, a filtering membrane 21 is horizontally arranged in the water level pipe 2, the filtering membrane 21 is positioned above the first communicating pipe 4, the filtering membrane 21 is made of a flexible material which is permeable to air but impermeable to water, and the edge of the filtering membrane 21 is fixedly connected with the water level pipe 2; referring to fig. 5, a second liquid level sensor 7 is installed in the water level pipeline 2, the second liquid level sensor 7 is located at the top of the water level pipeline 2, and the second liquid level sensor 7 is used for detecting displacement information in the middle of the filtering membrane 21 and liquid level information in the water level pipeline 2 and transmitting corresponding displacement signals and liquid level signals; a controller 8 and an alarm 10 are installed on one side of the water level pipeline 2, the controller 8 is connected with the second liquid level sensor 7 and the alarm 10, and the controller 8 responds to the corresponding liquid level signal and controls the alarm 10 to give an alarm.
Installing an overflow pipeline 3:
referring to fig. 1 and 2, a plurality of overflow pipelines 3 are arranged along the circumferential direction of the foundation pit 0 and are in one-to-one correspondence with the water level pipelines 2, the cross sections of the overflow pipelines 3 are circular, the bottom of each overflow pipeline 3 is of a closed structure, and each overflow pipeline 3 is vertically arranged on one side, far away from the foundation pit 0, of each water level pipeline 2 and is abutted to the corresponding water level pipeline 2; referring to fig. 5, a first liquid level sensor 6 is installed in the overflow pipeline 3, the first liquid level sensor 6 is located at the top of the overflow pipeline 3, the first liquid level sensor 6 is used for detecting liquid level information of groundwater in the overflow pipeline 3 and transmitting a corresponding liquid level signal, and the first liquid level sensor 6 is connected with a controller 8.
Installing the first communicating pipe 4:
referring to fig. 4, the first communicating pipe 4 is horizontally arranged between the water level pipe 2 and the overflow pipe 3, the first communicating pipe 4 is communicated with the inside of the water level pipe 2 and the inside of the overflow pipe 3, the check valve 41 is installed on the first communicating pipe 4, and the first communicating pipe 4 is installed between the water level pipe 2 and the overflow pipe 3.
Installing the second communicating pipe 5:
referring to fig. 2 and 4, the second communicating pipe 5 is horizontally arranged between the water level pipe 2 and the overflow pipe 3 and is located below the first communicating pipe 4, the second communicating pipe 5 is communicated with both the inside of the water level pipe 2 and the inside of the overflow pipe 3, a valve 51 is installed on the second communicating pipe 5, the valve 51 is connected with the controller 8, and the controller 8 responds to a corresponding liquid level signal and controls the opening and closing of the valve 51; between the installation of the water level pipe 2 and the overflow pipe 3, the second communicating pipe 5 is installed first.
Installing the inflation assembly 9:
the air inflation assembly 9 is provided with a plurality of air inflation assemblies which are in one-to-one correspondence with the water level pipelines 2, each air inflation assembly 9 comprises an air pump 91 and an air inlet pipe, the air pumps 91 are installed on one sides of the corresponding water level pipelines 2, one end of each air inlet pipe is fixedly connected with the air pump 91, and the other end of each air inlet pipe is fixedly connected with the top surface of the corresponding water level pipeline 2 and communicated with the inside of the corresponding water level pipeline 2; the controller 8 responds to the corresponding liquid level signal and displacement signal, and controls the air pump 91 to be turned on and off.
Installing a display:
referring to fig. 1 and 2, the display is installed in water level pipeline 2 one side, and display screen 1 all is connected with first level sensor 6, second level sensor 7, and display screen 1 is used for showing the information that first level sensor 6 and second level sensor 7 detected in real time.
The implementation principle of the method for monitoring the multi-stage support foundation pit in the embodiment of the application is as follows: after the installation is finished, underground water of a construction environment of a foundation pit 0 is detected and treated, under the condition that the underground water liquid level continuously rises, when the underground water liquid level in the water level pipeline 2 reaches the position of the first communication pipeline 4, the underground water in the water level pipeline 2 enters the overflow pipeline 3 through the first communication pipeline 4, at the moment, the underground water liquid level in the overflow pipeline 3 is monitored by the first liquid level sensor 6 in the overflow pipeline 3, when the underground water liquid level in the overflow pipeline 3 is the same as the liquid level of the underground water in the water level pipeline 2, the first liquid level sensor 6 sends out a corresponding liquid level signal, the controller 8 responds to the liquid level signal and controls the air pump 91 to start working, so that the air pump 91 fills gas into the water level pipeline 2 through the air inlet pipe, the air pressure in the water level pipeline 2 is further increased, and the underground water liquid level in the water level pipeline 2 can be stabilized at the first communication pipe, and the groundwater that continuously rises gets into in the overflow pipe 3 through first communicating pipe 4, and then makes the liquid level in the water level pipeline 2 remain stable, and the liquid level in the overflow pipe 3 continuously rises to the realization is to the processing that the groundwater liquid level rises.
Meanwhile, a filtering membrane 21 is further arranged in the water level pipeline 2, in the starting process of the air charging assembly 9, the groundwater level in the water level pipeline 2 may exceed the position of the first communicating pipeline 4, at this time, groundwater exceeding the first communicating pipeline may affect the foundation pit 0 construction, the arrangement of the filtering membrane 21 can prevent the groundwater level in the water level pipeline 2 from exceeding the first communicating pipeline 4, and meanwhile, the air charging operation of the air charging assembly 9 is not affected, and in the case that groundwater in the water level pipeline 2 is continuously increased, groundwater in the water level pipeline 2 may extrude the filtering membrane 21, so that the middle part of the filtering membrane 21 fluctuates, the second liquid level sensor 7 reflects the fluctuation condition of the filtering membrane 21 by detecting the displacement information in the middle of the filtering membrane 21, the controller 8 responds to the displacement signal and further controls the working state of the air pump 91, so that the filtering membrane 21 returns to the initial state, the damage caused by the transition fluctuation of the filtering membrane 21 is avoided, and the groundwater in the water level pipeline 2 can better enter the overflow pipeline 3.
When the underground water level is suddenly reduced under the influence of other factors, the surface of the foundation pit 0 may be settled due to the large change of the underground water level, and at the moment, the second liquid level sensor 7 can detect the underground water level in the water level pipeline 2, so that the controller 8 responds to the liquid level signal and controls the alarm 10 to give an alarm, a constructor can know the reduction condition of the underground water level in time, and the constructor can judge whether to continue construction according to the actual condition; meanwhile, the controller 8 responds to the corresponding liquid level signal and controls the valve 51 to be opened, so that the underground water in the overflow pipeline 3 can flow back to the underground through the second communication pipeline 5, the variation amplitude of the liquid level of the underground water is reduced, the possibility of settlement on the surface of the foundation pit 0 is reduced, and the treatment effect of the underground water is further improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A multi-stage support foundation pit monitoring method is characterized by comprising the following steps: the method comprises the following steps:
installing a water level pipeline (2): vertically inserting the water level pipelines (2) at the outer side of the foundation pit (0), wherein a plurality of water level pipelines (2) are arranged along the circumferential direction of the foundation pit (0), and the top of each water level pipeline (2) is of a closed structure;
installing an overflow pipe (3): the overflow pipelines (3) are arranged and correspond to the water level pipelines (2) one by one, the overflow pipelines (3) are vertically arranged on one side of the water level pipelines (2), and the bottom of each overflow pipeline (3) is of a closed structure;
installing a first communication duct (4): the first communicating pipeline (4) is arranged between the water level pipeline (2) and the overflow pipeline (3), the first communicating pipeline (4) is communicated with the inside of the water level pipeline (2) and the inside of the overflow pipeline (3), and the first communicating pipeline (4) is provided with a one-way valve (41);
installing an inflation assembly (9): the aeration component (9) is arranged on the top surface of the water level pipeline (2), and the aeration component (9) is used for aerating the inside of the water level pipeline (2).
2. The method for monitoring the multi-stage support foundation pit according to claim 1, wherein: a filtering membrane (21) is horizontally arranged in the water level pipeline (2), the filtering membrane (21) is located above the first communicating pipeline (4), the filtering membrane (21) is made of a breathable but waterproof flexible material, and the edge of the filtering membrane (21) is fixedly connected with the water level pipeline (2).
3. The method for monitoring the multi-stage support foundation pit according to claim 2, wherein: overflow pipe (3) internal fixation is provided with first level sensor (6), and first level sensor (6) are located overflow pipe (3) top, and first level sensor (6) are used for detecting the liquid level information in overflow pipe (3) to the liquid level signal that the transmission corresponds, and first level sensor (6) are connected with controller (8), and controller (8) are responded to the liquid level signal and are controlled the operating condition who aerifys subassembly (9).
4. The method for monitoring the multi-stage support foundation pit according to claim 3, wherein: install second liquid level sensor (7) in water level pipeline (2), second liquid level sensor (7) are located filtering membrane (21) top, and are connected with controller (8), and second liquid level sensor (7) are used for detecting the displacement information in the middle of filtering membrane (21) to transmit corresponding displacement signal, controller (8) respond to displacement signal and control the operating condition of inflatable component (9).
5. The method for monitoring the multi-stage support foundation pit according to claim 1, wherein: and a second communicating pipeline (5) is arranged below the first communicating pipeline (4), the second communicating pipeline (5) is communicated with the inside of the water level pipeline (2) and the inside of the overflow pipeline (3), and a valve (51) is arranged on the second communicating pipeline (5).
6. The method for monitoring the multi-stage support foundation pit according to claim 4, wherein: the second liquid level sensor (7) is also used for detecting liquid level information in the water level pipeline (2) and transmitting a corresponding liquid level signal, the controller (8) is connected with the valve (51), and the controller (8) responds to the liquid level signal and controls the working state of the valve (51).
7. The method for monitoring the multi-stage support foundation pit according to claim 6, wherein: be provided with display screen (1) on water level pipeline (2), display screen (1) all is connected with first level sensor (6), second level sensor (7), and display screen (1) is used for showing the information that first level sensor (6) and second level sensor (7) detected in real time.
8. The method for monitoring the multi-stage support foundation pit according to claim 6, wherein: the water level pipeline (2) is provided with an alarm (10), the alarm (10) is connected with the controller (8), and the controller (8) responds to a liquid level signal transmitted by the second liquid level sensor (7) and controls the alarm (10) to give an alarm.
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