Water level sensor and foundation pit dewatering water level monitoring, regulating and controlling device, system and method

Abstract

The invention discloses a water level sensor and a foundation pit dewatering water level monitoring, regulating and controlling device, system and method, the water level sensor comprises a shell, the shell has conductivity, a water permeable hole is formed in the shell, and the water permeable hole is used for water to enter and exit from the shell; the memory metal wire is arranged in the shell, and one end of the memory metal wire extends out of the shell and is used for being connected with the positive electrode of a first wire; and the balancing weight is arranged in the shell, the balancing weight is connected with the other end of the memory metal wire, and the balancing weight is connected with the shell through a second wire. According to the invention, the water level sensor has the characteristics of low temperature coefficient resistance and the like, so that the interference of external complex environmental factors on a measurement result can be effectively reduced, the measurement accuracy and sensitivity are improved, and meanwhile, the water level sensor can be placed in a precipitation well for a long time to continuously monitor and record the water level change in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of water level monitoring and regulation in deep foundation pit dewatering projects, and further to a water level sensor, a foundation pit dewatering water level monitoring and regulation device, a system and a method. Background Art

[0002] With the accelerated advancement of urbanization, urban space is constantly expanding, more and more urban underground space is being developed, and the construction environment of underground projects is becoming increasingly complex. There are more and more surrounding buildings, subways, roads, pipelines and other facilities, which brings greater challenges to the construction of subsequent deep foundation pit projects and the control of soil settlement around the foundation pit. Among them, the control of pressurized water by foundation pit dewatering projects is one of the keys to foundation pit construction. In order to ensure the safety and stability of deep foundation pit excavation and avoid risks such as slope instability, quicksand or sudden surges, effective foundation pit dewatering is essential. For foundation pit projects with different geological conditions, dewatering methods vary. Among them, pipe well dewatering is widely used due to its large drainage volume, deep dewatering depth and wide dewatering range.

[0003] At present, the mainstream method of foundation pit dewatering control still relies on manual regular measurement and monitoring of groundwater levels, and the water level is maintained stable by manually starting and stopping water pumps. However, manual monitoring is not only inefficient and time-effective, but also, as the scale of the foundation pit increases, the number of dewatering pipe wells will increase significantly, up to hundreds or more. The huge number of pipe wells will greatly increase the difficulty of management, leading to more manpower and resource investment, and at the same time, it will also increase the uncertainty of human factors on the operation of dewatering monitoring.

[0004] Automated precipitation monitoring has the advantages of real-time monitoring, high precision, automatic data processing, early warning, and the ability to cover a wider precipitation area in the field of foundation pit monitoring projects. It is the future development trend of automated foundation pit monitoring. However, automated precipitation monitoring is still in its early stages, and it mainly focuses on early warning. It is not yet possible to make automated preliminary interventions in early warning situations to reduce risks in a timely manner. In addition, the existing water level monitoring device has a relatively complex structure. Faced with the needs of different scenarios such as construction site environments, poor water quality, long-term monitoring arrangements, and multiple turnovers, existing products cannot fully meet the needs in terms of detection accuracy, failure rate, durability, etc., and there is still a lot of room for improvement. Summary of the invention

[0005] In view of the above technical problems, the purpose of the present invention is to provide a water level sensor, a foundation pit dewatering water level monitoring and control device, a system and a method. The low temperature coefficient resistance and other characteristics of the water level sensor can effectively reduce the interference of complex external environmental factors on the measurement results, and improve the measurement accuracy and sensitivity. At the same time, it can be placed in the dewatering well for a long time to monitor and record water level changes in real time without interruption.

[0006] In order to achieve the above object, the present invention provides a water level sensor, comprising:

[0007] A shell, the shell is conductive and is provided with a water-permeable hole, the water-permeable hole is used for supplying water into and out of the shell;

[0008] A memory metal wire is disposed in the housing, and one end of the memory metal wire extends out of the housing to be connected to the positive electrode of the first wire;

[0009] A counterweight block is arranged in the shell, the counterweight block is connected to the other end of the memory metal wire, and the counterweight block is connected to the shell through a second wire.

[0010] In some embodiments, the shell includes a first shell and a second shell, the first shell is respectively provided with a first fixing portion at both ends, the second shell is respectively provided with a second fixing portion at both ends, the first shell is buckled on the second shell, and each of the first fixing portions is adapted to be connected with the second fixing portion at the corresponding end.

[0011] In some embodiments, the first fixing portion includes a first fixing block, the first fixing block is fixed to the middle position of the end of the first shell, and the first fixing block is provided with a plurality of first fixing holes;

[0012] The second fixing portion includes a second fixing block, the second fixing block is fixed to the middle position of the end of the second shell, and the second fixing block is provided with a plurality of second fixing holes;

[0013] A plurality of fixing members pass through the corresponding first fixing holes and the corresponding second fixing holes in sequence to detachably connect the corresponding first fixing block and the corresponding second fixing block.

[0014] In some embodiments, a groove is provided at the connection between the first fixing block and the second fixing block, the groove extends along the extension direction of the memory metal wire, and the memory metal wire is arranged in the groove, so that the first fixing block and the second fixing block clamp and fix the memory metal wire;

[0015] There are two water-permeable holes, which are respectively arranged at two ends of the shell and located at the connection between the first shell and the second shell.

[0016] In some embodiments, the shell is a hollow cylindrical closed structure, the shell is made of a conductive medium material with a density greater than that of water, the outer surface of the shell has an insulating layer, and the first shell and the second shell are symmetrically arranged semi-cylindrical structures;

[0017] One end of the shell is connected to the second wire, and the other end of the shell is connected to the negative electrode of the first wire.

[0018] In some embodiments, the memory metal wire is a nickel-titanium shape memory alloy wire, and an insulating protective sheath is provided at the connection between the memory metal wire and the first conductive wire;

[0019] And / or, the counterweight block is a cylindrical structure, the counterweight block is made of a conductive medium material with a density greater than water, the outer surface of the counterweight block has an insulating layer, one end of the counterweight block is connected to the memory metal wire, and the other end of the counterweight block is connected to the second wire.

[0020] According to another aspect of the present invention, the present invention further provides a foundation pit dewatering water level monitoring and control device, comprising any one of the water level sensors described above, and further comprising:

[0021] A cable, wherein the cable is provided with a scale, a first wire is provided inside the cable, a positive pole of the first wire is connected to the memory metal wire, and a negative pole of the first wire is connected to the housing;

[0022] A cable reel box, the cable is wound on the cable reel box, the cable reel box is provided with an MCU processor and an Internet of Things communication module, the MCU processor is used to calculate and process the resistance value of the water level sensor to convert it into a corresponding water level value, and output the water level value to the Internet of Things communication module; the Internet of Things communication module is used to send the data transmitted by the MCU processor to a remote end;

[0023] The photovoltaic solar panel power supply module is used to provide working power for the foundation pit dewatering water level monitoring and control device. The photovoltaic solar panel power supply module is also equipped with energy storage batteries and converters for temporary power supply or external power supply when solar energy is insufficient.

[0024] According to another aspect of the present invention, the present invention further provides a foundation pit dewatering water level monitoring and control system, comprising the foundation pit dewatering water level monitoring and control device described above, and further comprising: a pumping and recharging module and a digital management module;

[0025] The foundation pit dewatering water level monitoring and control device is used to measure and monitor the groundwater level in the foundation pit construction area in real time, calculate and determine whether the water level meets the dewatering water level requirements, and can simultaneously output signals to the pumping and recharging module and the digital management module to directly control the operation of the pumping and recharging module and send water level data and interact with the digital management module;

[0026] The pumping and recharging module is used to extract and recharge water from the dewatering wells and recharging wells arranged in the foundation pit construction area;

[0027] The digital management module is used to receive the real-time water level signal sent by the foundation pit dewatering water level monitoring and control device, record, store and display the working operation data of the foundation pit dewatering water level monitoring and control device, and can also remotely control the operating parameters of the foundation pit dewatering water level monitoring and control device and the working status of the water pumping and recharging module online.

[0028] In some embodiments, the pumping and recharging module includes an electric control box, a water pump and a drive control circuit. The electric control box is respectively connected to the water pump and the foundation pit dewatering water level monitoring and control device, and is used to receive instructions to control the start and stop and power supply of the water pump. The water pump is used to extract or recharge groundwater in the dewatering well and the recharging well. The drive control circuit is used for signal transmission between the electric control box and the foundation pit dewatering water level monitoring and control device;

[0029] The digital management module includes: a cloud server, a digital cloud management platform and a mobile terminal platform. The cloud server is used to receive, process and record the real-time water level information sent by the foundation pit dewatering water level monitoring and control device, and integrate the data on the digital cloud management platform. The digital cloud management platform is used for online integration, digitization, visualization and integrated management of the water level data information of each foundation pit dewatering water level monitoring and control device. The mobile terminal platform is a mobile terminal APP or applet of the digital cloud management platform, which is used for remote online management of mobile device terminals.

[0030] According to another aspect of the present invention, the present invention further provides a method for using a foundation pit dewatering water level monitoring and control system, comprising the steps of:

[0031] Install and fix the cable reel box and water pumping and recharging module, place water level sensors in each precipitation well and recharging well, and configure the photovoltaic solar panel power supply module to power the system;

[0032] Use the digital cloud management platform to initialize the settings of each foundation pit dewatering water level monitoring and control device;

[0033] The water level sensor is used to continuously monitor water level changes. The MCU processor captures the changes in real time and converts them into specific water level data. The water level data is analyzed to determine whether the preset water level control standard is met.

[0034] The digital cloud management platform is used to intelligently analyze the received water level data. Combined with BIM technology, the water level data of each precipitation well on site is linked with the corresponding foundation pit and precipitation well model in the digital cloud management platform. Real-time analysis is performed to see whether the water level of each well reaches the preset water level control standard, and the results are graded and colored in real time on the corresponding precipitation well model.

[0035] Use mobile terminal platforms or online digital cloud management platforms to monitor the real-time water level conditions in various areas of the foundation pit and remotely adjust the working status of the corresponding water pumps; in case of abnormal conditions, use digital cloud management platforms and mobile terminal platforms to send early warning notifications to maintenance personnel;

[0036] A digital cloud management platform is used to summarize and analyze historical water level data and generate precipitation process reports, which include water level change trend charts, pumping and recharge statistics, and system operation efficiency evaluation.

[0037] Compared with the prior art, the water level sensor, foundation pit dewatering water level monitoring and control device, system and method provided by the present invention have at least one of the following beneficial effects:

[0038] 1. The water level sensor provided by the present invention, based on the low temperature coefficient resistance and other characteristics of nickel-titanium shape memory alloy materials and the streamlined structural design, can effectively reduce the interference of complex external environmental factors on the measurement results, improve the measurement accuracy and sensitivity, and at the same time, can be placed in a precipitation well for a long time to continuously monitor and record water level changes in real time;

[0039] 2. The foundation pit dewatering water level monitoring and control system provided by the present invention is based on a water level measurement and monitoring sensor and an integrated computing and communication module made of nickel-titanium shape memory alloy material. Compared with the existing water level monitoring device, it can greatly simplify the device structure, reduce the failure rate and unit cost, better adapt to the complex construction site environment, and improve durability and turnover rate; it can realize the monitoring and control of automatic pumping and reinjection of multiple deep foundation pit dewatering wells, which not only eliminates the direct manual management of dewatering construction operations, effectively saves human resources, and further improves the overall dewatering efficiency of the foundation pit, but also realizes the intelligent and digital management of deep foundation pit dewatering projects, providing a strong guarantee for project safety and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0041] Figure 1 It is a structural schematic diagram of a water level sensor according to a preferred embodiment of the present invention;

[0042] Figure 2 is an upper sectional view of a water level sensor according to a preferred embodiment of the present invention;

[0043] Figure 3 is a lower cross-sectional view of a water level sensor according to a preferred embodiment of the present invention;

[0044] Figure 4 It is a module diagram of a foundation pit dewatering water level monitoring and control system according to a preferred embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the structure of the foundation pit dewatering water level monitoring and control system of the preferred embodiment of the present invention.

[0046] Description of Figure Numbers:

[0047] Foundation pit dewatering water level monitoring and control device 1, water level sensor 11, memory metal wire 111, counterweight 112, shell 113, wire 114, fixing hole 115, insulating protective cover 116, water permeable hole 117, cable 12, cable reel box 13, MCU processor 14, Internet of Things communication module 15, volt solar panel power supply module 16, water pumping and recharging module 2, electric control box 21, water pump 22, drive control circuit 23, digital management module 3, cloud server 31, digital cloud management platform 32, mobile terminal platform 33, ground 4, dewatering well 41, target water level 42. DETAILED DESCRIPTION

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0049] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0050] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0051] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0053] In one embodiment, the reference specification Figures 1 to 3 A water level sensor provided by the present invention includes: a shell 113, a memory metal wire 111 and a counterweight 112, the shell 113 is conductive, and a water permeable hole 117 is provided on the shell 113, and the water permeable hole 117 is used to supply water into and out of the shell 113; the memory metal wire 111 is arranged in the shell 113, and one end of the memory metal wire 111 extends out of the shell 113 to be connected to the positive electrode of the first wire; the counterweight 112 is arranged in the shell 113, and the counterweight 112 is connected to the other end of the memory metal wire 111, and the counterweight 112 is connected to the shell 113 through a second wire.

[0054] Specifically, refer to the attached manual Figures 1 to 3 The shell 113 includes a first shell and a second shell. The first two ends of the first shell are respectively provided with a first fixing part, and the second two ends of the second shell are respectively provided with a second fixing part. The first shell is buckled on the second shell, and each first fixing part is adapted to be connected with the second fixing part at the corresponding end. The first fixing part includes a first fixing block, which is fixed at the middle position of the end of the first shell, and the first fixing block is provided with a plurality of first fixing holes; the second fixing part includes a second fixing block, which is fixed at the middle position of the end of the second shell, and the second fixing block is provided with a plurality of second fixing holes; a plurality of fixing members sequentially pass through the corresponding first fixing holes and the second fixing holes to detachably connect the corresponding first fixing block and the second fixing block.

[0055] It should be noted that the first fixing hole and the second fixing hole can both be fixing holes 115, and their names are different only to distinguish their positions. The fixing hole 115 can be a through hole or a threaded hole, and the fixing part can be a screw or a screw and a nut, etc., as long as the structure can achieve a fixed connection or a detachable connection between the first shell and the second shell.

[0056] Furthermore, a groove is provided at the connection between the first fixed block and the second fixed block, and the groove extends along the extending direction of the memory metal wire 111. The memory metal wire 111 is arranged in the groove, so that the first fixed block and the second fixed block clamp and fix the memory metal wire 111; two water-permeable holes 117 are provided, and the two water-permeable holes 117 are respectively arranged at both ends of the shell 113 and are located at the connection between the first shell and the second shell.

[0057] The shell 113 is a hollow cylindrical closed structure. The shell 113 is made of a conductive medium material with a density greater than that of water. The outer surface of the shell 113 has an insulating layer. The first shell and the second shell are symmetrically arranged semi-cylindrical structures. One end of the shell 113 is connected to the second wire, and the other end of the shell 113 is connected to the negative electrode of the first wire. The first wire and the second wire are both wires 114, and their names are different only to distinguish their positions. Of course, the shell 113 can also be set to other shapes, such as a polygonal structure or a special-shaped structure.

[0058] The memory wire 111 is a nickel-titanium shape memory alloy wire, and an insulating protective sleeve 116 is provided at the connection between the memory wire 111 and the first wire. The memory wire 111 can also be set as a copper-based shape memory alloy, an iron-based shape memory alloy, etc. The counterweight 112 is a cylindrical structure, and the counterweight 112 is made of a conductive medium material with a density greater than that of water. The outer surface of the counterweight 112 has an insulating layer, and one end of the counterweight 112 is connected to the memory wire 111, and the other end of the counterweight 112 is connected to the second wire.

[0059] In this embodiment, the water level sensor includes nickel-titanium shape memory alloy wire (NiTi SMA), a counterweight 112, a housing 113, a cable with scale lines, etc. The core component of the device is NiTi SMA, which uses the characteristics of its on-resistance changing linearly in a certain range with the change of tensile stress and low temperature coefficient resistance. By measuring the change of its resistance with the change of buoyancy of the counterweight 112 connected below in the water due to the change of water level, the tensile stress on NiTi SMA is constantly changed, and the resistance value changes caused, the actual water level change height is calculated, thereby achieving real-time and accurate measurement and monitoring of the water level.

[0060] The NiTi SMA water level sensor needs to be precisely manufactured, and components such as the nickel-titanium shape memory alloy wire (NiTi SMA) and the counterweight block 112 need to be properly assembled. The NiTi SMA water level sensor is placed at the target water level position in the precipitation well, and the counterweight block 112 changes the tension on the NiTi SMA water level sensor as the water level changes, thereby accurately changing the resistance value of the nickel-titanium shape memory alloy wire (NiTi SMA).

[0061] According to another aspect of the present invention, Figure 5The present invention further provides a foundation pit dewatering water level monitoring and control device 1, comprising the water level sensor 11 described in any one of the above, and also comprising: a cable 12 and a cable reel box 13, the cable 12 is provided with a scale, a first wire is provided inside the cable 12, the positive pole of the first wire is connected to the memory metal wire 111, and the negative pole of the first wire is connected to the shell 113; the cable 12 is wound on the cable reel box 13, and the cable reel box 13 is provided with an MCU processor 14 and an Internet of Things communication module 15, the MCU processor 14 is used to calculate and process the resistance value of the water level sensor 11 and convert it into a corresponding water level value, and output the water level value to the Internet of Things communication module 15; the Internet of Things communication module 15 is used to send the data transmitted by the MCU processor 14 to a remote end.

[0062] Furthermore, the foundation pit dewatering water level monitoring and control device 1 also includes: a photovoltaic solar panel power supply module 16, which is used to provide working power for the foundation pit dewatering water level monitoring and control device 1. The photovoltaic solar panel power supply module 16 is also equipped with a storage battery and a converter, which is used for temporary power supply or external power supply when solar energy is insufficient.

[0063] Specifically, the cable 12 with scale lines is respectively connected to the water level sensor 11 and the cable reel box 13 , and is used to supply power to the water level sensor 11 , anchor the target to control the water level, and physically measure and display the water level depth of the water level sensor 11 .

[0064] The cable reel box 13 is used to store the cable 12 with scale lines in a portable manner, and encapsulates the MCU processor 14 and the IoT communication module 15 as well as the power supply requirements. The built-in encapsulation is equipped with the MCU processor 14 and the IoT communication module 15 as well as the power supply interface to ensure the efficient operation of data processing and transmission.

[0065] The MCU processor 14 is built into the cable reel box 13, and is used to calculate and process the resistance value of the water level sensor 11 into the corresponding water level value, and output the implemented water level data to the Internet of Things communication module 15; at the same time, the MCU processor 14 can edit and set the target control water level and safety water level threshold, and output signals to control the operation of the water pumping and recharging module.

[0066] The Internet of Things communication module 15 is used to send the data transmitted from the MCU processor 14 to the digital management module, or to transmit the data sent from the digital management module to the MCU processor 14.

[0067] The photovoltaic solar panel power supply module 16 is used for the working power supply of the entire foundation pit dewatering water level monitoring and control device 1, and is equipped with energy storage batteries and converters for temporary power supply or external power supply when solar energy is insufficient.

[0068] According to another aspect of the present invention, Figures 1 to 5The present invention further provides a foundation pit dewatering water level monitoring and control system, including the foundation pit dewatering water level monitoring and control device 1 described above, and also including: a pumping and recharging module 2 and a digital management module 3. The foundation pit dewatering water level monitoring and control device 1 is used to measure and monitor the groundwater level in the foundation pit construction area in real time, calculate and determine whether the water level meets the dewatering water level requirement, and can simultaneously output signals to the pumping and recharging module 2 and the digital management module 3, which are used to directly control the operation of the pumping and recharging module 2 and send water level data and interact with the digital management module 3. The pumping and recharging module 2 is used to extract and recharge water from the dewatering wells and recharging wells arranged in the foundation pit construction area. The digital management module 3 is used to receive the real-time water level signal sent by the foundation pit dewatering water level monitoring and control device 1, record, store and display the working and operating data of the foundation pit dewatering water level monitoring and control device 1, and can also remotely control the operating parameters of the foundation pit dewatering water level monitoring and control device 1 and the working status of the pumping and recharging module 2 online.

[0069] Specifically, the pumping and recharging module 2 includes an electrical control box 21, a water pump 22 and a drive control circuit 23. The electrical control box 21 is respectively connected to the water pump 22 and the foundation pit dewatering water level monitoring and control device 1, and is used to receive instructions to control the start and stop and power supply of the water pump 22. The water pump 22 is used to extract or recharge groundwater in the dewatering well and the recharging well. The drive control circuit 23 is used for signal transmission between the electrical control box 21 and the foundation pit dewatering water level monitoring and control device 1.

[0070] The digital management module 15 includes: a cloud server 31, a digital cloud management platform 32 and a mobile terminal platform 33. The cloud server 31 is used to receive, process and record the real-time water level information sent by the foundation pit dewatering water level monitoring and control device 1, and integrate the data on the digital cloud management platform 32. The digital cloud management platform 32 is used for online integration, digitization, visualization and integrated management of the water level data information of each foundation pit dewatering water level monitoring and control device 1. The mobile terminal platform 33 is a mobile terminal APP or applet of the digital cloud management platform 32, which is used for remote online management of mobile device terminals.

[0071] In this embodiment, the foundation pit dewatering water level monitoring and control system is based on a water level measurement and monitoring sensor and an integrated computing and communication module made of nickel-titanium shape memory alloy material. Compared with the existing water level monitoring device, it can greatly simplify the device structure, reduce the failure rate and unit cost, better adapt to the complex construction site environment, and improve durability and turnover rate; it can realize the monitoring and control of automatic pumping and reinjection of multiple deep foundation pit dewatering wells, which not only eliminates the direct manual management of dewatering construction operations, effectively saves human resources, and further improves the overall dewatering efficiency of the foundation pit, but also realizes the intelligent and digital management of deep foundation pit dewatering projects, providing a strong guarantee for project safety and quality.

[0072] According to another aspect of the present invention, Figures 1 to 4 The present invention further provides a method for using a foundation pit dewatering water level monitoring and control system, comprising the steps of:

[0073] Step S1, first install and fix the cable reel box 13 on the ground 4, and reasonably arrange the water level sensor 11 in each precipitation well 41 and recharge well. At the same time, install the electrical control box 21, water pump 22 and related components, and configure the photovoltaic solar panel power supply module 16 to ensure that the power supply of the entire system is reliable, and check and confirm that the sensor operates stably and can accurately reflect the water level changes.

[0074] Step S2, before the system is operated, each foundation pit dewatering water level monitoring and control device 1 is initialized and set up through the digital cloud management platform 32, including calibrating the correspondence between the initial resistance value of the water level sensor and the water level, setting the target water level 42 and the safety threshold, and testing the connectivity and stability of the Internet of Things communication.

[0075] In step S3, the water level sensor 11 continuously monitors the water level change, and its resistance value changes with the water level change. The MCU processor 14 captures the change in real time and converts it into specific water level data, and analyzes the water level data to determine whether it meets the preset water level control standard; when the water level exceeds the set threshold, the MCU processor 14 will automatically trigger the response mechanism, send instructions to the electrical control box 21 to adjust the working state of the corresponding water pump 22, realize automatic pumping or recharging, and keep the water level stable within a safe range; at the same time, the MCU processor 14 sends the dynamic data to the digital cloud management platform 32 in real time through the Internet of Things communication module 15, so as to realize real-time monitoring of precipitation water level and cloud data recording.

[0076] Step S4, the digital cloud management platform 32 performs intelligent analysis on the received water level data, and combines BIM technology to associate and link the water level data of each dewatering well on site with the corresponding foundation pit and dewatering well model in the digital cloud management platform 32, and analyze in real time whether the water level of each well reaches the preset water level control standard, and classify and color-code the results in real time on the corresponding dewatering well model, so as to realize real-time, visual monitoring and intelligent early warning of the water level of the entire foundation pit dewatering construction process.

[0077] Step S5, through the mobile terminal platform 33 or the online digital cloud management platform 32, the management personnel can check the real-time water level conditions of each area of ​​the foundation pit anytime and anywhere, and remotely adjust the control strategy when necessary, such as modifying the target water level setting, adjusting the pumping rate or arranging a pumping plan for a specific time, or through the Internet of Things communication module 15, directly sending instructions to the electric control box 21 via the drive control circuit 23 to adjust the working status of the corresponding water pump 22 to adapt to the construction progress or respond to emergencies.

[0078] Step S6, the system integrates a fault self-diagnosis function. Once it detects an abnormality in the water level sensor 11, a power supply problem, or a communication interruption, it immediately sends an early warning notification to the maintenance personnel through the digital cloud management platform 32 and the mobile terminal platform 33, so as to facilitate rapid response and take measures to reduce system downtime and ensure the continuity and safety of precipitation work.

[0079] In step S7, the digital cloud management platform 32 can summarize and analyze historical water level data to generate a detailed precipitation process report, including a water level change trend chart, pumping and recharge statistics, system operation efficiency evaluation, etc., to provide a scientific basis for project management, cost control and the design of subsequent similar projects.

[0080] In this embodiment, an automated foundation pit dewatering water level monitoring and control device based on nickel-titanium shape memory alloy material (NiTi SMA) and an integrated intelligent dewatering system and dewatering method composed thereof realize accurate monitoring and intelligent regulation of dewatering during the entire process of foundation pit excavation; the new water level measurement and monitoring sensor and computing and communication modules based on nickel-titanium shape memory alloy material (NiTi SMA) can be placed in a dewatering well for a long time, and can detect and record water level changes in real time with high sensitivity; through the MCU processor 14 carried, local calculations can be completed quickly and the corresponding water pump 22 of the water pumping and recharging module 2 can be controlled to adjust the water level; at the same time, the signal is transmitted to the cloud server in real time through the communication module, and then remote tracking and monitoring, control and adjustment of the on-site dewatering water level are realized through the online digital management platform and mobile terminal devices, thereby realizing accurate monitoring and intelligent regulation of dewatering during the entire process of foundation pit excavation.

[0081] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0082] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A water level sensor, characterized in that: include: A shell, the shell is conductive and is provided with a water-permeable hole, the water-permeable hole is used for supplying water into and out of the shell; A memory metal wire is disposed in the housing, and one end of the memory metal wire extends out of the housing to be connected to the positive electrode of the first wire; A counterweight block is arranged in the shell, the counterweight block is connected to the other end of the memory metal wire, and the counterweight block is connected to the shell through a second wire.

2. The water level sensor according to claim 1, characterized in that: The shell includes a first shell and a second shell, the first shell is respectively provided with a first fixing portion at both ends, the second shell is respectively provided with a second fixing portion at both ends, the first shell is buckled on the second shell, and each of the first fixing portions is adapted to be connected with the second fixing portion at the corresponding end.

3. The water level sensor according to claim 2, characterized in that: The first fixing portion includes a first fixing block, the first fixing block is fixed at a middle position of an end portion of the first shell, and a plurality of first fixing holes are provided on the first fixing block; The second fixing portion includes a second fixing block, the second fixing block is fixed to the middle position of the end of the second shell, and the second fixing block is provided with a plurality of second fixing holes; A plurality of fixing members pass through the corresponding first fixing holes and the corresponding second fixing holes in sequence to detachably connect the corresponding first fixing block and the corresponding second fixing block.

4. The water level sensor according to claim 3, characterized in that: A groove is provided at the connection between the first fixing block and the second fixing block, the groove extends along the extending direction of the memory metal wire, and the memory metal wire is arranged in the groove, so that the first fixing block and the second fixing block clamp and fix the memory metal wire; There are two water-permeable holes, which are respectively arranged at two ends of the shell and located at the connection between the first shell and the second shell.

5. The water level sensor according to claim 4, characterized in that: The shell is a hollow cylindrical closed structure, the shell is made of a conductive medium material with a density greater than that of water, the outer surface of the shell has an insulating layer, and the first shell and the second shell are symmetrically arranged semi-cylindrical structures; One end of the shell is connected to the second wire, and the other end of the shell is connected to the negative electrode of the first wire.

6. The water level sensor according to claim 1, characterized in that: The memory metal wire is a nickel-titanium shape memory alloy wire, and an insulating protective sleeve is provided at the connection between the memory metal wire and the first conductor; And / or, the counterweight block is a cylindrical structure, the counterweight block is made of a conductive medium material with a density greater than water, the outer surface of the counterweight block has an insulating layer, one end of the counterweight block is connected to the memory metal wire, and the other end of the counterweight block is connected to the second wire.

7. A foundation pit dewatering water level monitoring and control device, characterized in that: The water level sensor according to any one of claims 1 to 6 further comprises: A cable, wherein the cable is provided with a scale, a first wire is provided inside the cable, a positive pole of the first wire is connected to the memory metal wire, and a negative pole of the first wire is connected to the housing; A cable reel box, the cable is wound on the cable reel box, the cable reel box is provided with an MCU processor and an Internet of Things communication module, the MCU processor is used to calculate and process the resistance value of the water level sensor to convert it into a corresponding water level value, and output the water level value to the Internet of Things communication module; the Internet of Things communication module is used to send the data transmitted by the MCU processor to a remote end; The photovoltaic solar panel power supply module is used to provide working power for the foundation pit dewatering water level monitoring and control device. The photovoltaic solar panel power supply module is also equipped with energy storage batteries and converters for temporary power supply or external power supply when solar energy is insufficient.

8. A foundation pit dewatering water level monitoring and control system, characterized in that: The device comprises the foundation pit dewatering water level monitoring and control device as claimed in claim 8, and further comprises: a pumping and recharging module and a digital management module; The foundation pit dewatering water level monitoring and control device is used to measure and monitor the groundwater level in the foundation pit construction area in real time, calculate and determine whether the water level meets the dewatering water level requirements, and can simultaneously output signals to the pumping and recharging module and the digital management module to directly control the operation of the pumping and recharging module and send water level data and interact with the digital management module; The pumping and recharging module is used to extract and recharge water from the dewatering wells and recharging wells arranged in the foundation pit construction area; The digital management module is used to receive the real-time water level signal sent by the foundation pit dewatering water level monitoring and control device, record, store and display the working operation data of the foundation pit dewatering water level monitoring and control device, and can also remotely control the operating parameters of the foundation pit dewatering water level monitoring and control device and the working status of the water pumping and recharging module online.

9. The foundation pit dewatering water level monitoring and control system according to claim 8, characterized in that: The pumping and recharging module includes an electric control box, a water pump and a drive control circuit. The electric control box is respectively connected to the water pump and the foundation pit dewatering water level monitoring and control device, and is used to receive instructions to control the start and stop and power supply of the water pump. The water pump is used to extract or recharge groundwater in the dewatering well and the recharging well. The drive control circuit is used for signal transmission between the electric control box and the foundation pit dewatering water level monitoring and control device; The digital management module includes: a cloud server, a digital cloud management platform and a mobile terminal platform. The cloud server is used to receive, process and record the real-time water level information sent by the foundation pit dewatering water level monitoring and control device, and integrate the data on the digital cloud management platform. The digital cloud management platform is used for online integration, digitization, visualization and integrated management of the water level data information of each foundation pit dewatering water level monitoring and control device. The mobile terminal platform is a mobile terminal APP or applet of the digital cloud management platform, which is used for remote online management of mobile device terminals.

10. A method for using a foundation pit dewatering water level monitoring and control system, characterized in that: Includes steps: Install and fix the cable reel box and water pumping and recharging module, place water level sensors in each precipitation well and recharging well, and configure the photovoltaic solar panel power supply module to power the system; Use the digital cloud management platform to initialize the settings of each foundation pit dewatering water level monitoring and control device; The water level sensor is used to continuously monitor water level changes. The MCU processor captures the changes in real time and converts them into specific water level data. The water level data is analyzed to determine whether the preset water level control standard is met. The digital cloud management platform is used to intelligently analyze the received water level data. Combined with BIM technology, the water level data of each precipitation well on site is linked with the corresponding foundation pit and precipitation well model in the digital cloud management platform. Real-time analysis is performed to see whether the water level of each well reaches the preset water level control standard, and the results are graded and colored in real time on the corresponding precipitation well model. Use mobile terminal platforms or online digital cloud management platforms to monitor the real-time water level conditions in various areas of the foundation pit and remotely adjust the working status of the corresponding water pumps; in case of abnormal conditions, use digital cloud management platforms and mobile terminal platforms to send early warning notifications to maintenance personnel; A digital cloud management platform is used to summarize and analyze historical water level data and generate precipitation process reports, which include water level change trend charts, pumping and recharge statistics, and system operation efficiency evaluation.

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