CN111119216A - Wireless-transmission foundation pit dewatering variable-frequency control system and application method thereof - Google Patents
Wireless-transmission foundation pit dewatering variable-frequency control system and application method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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Abstract
The invention relates to the field of control for reducing underground water level, in particular to a wireless-transmission foundation pit dewatering variable-frequency control system and a using method thereof. The utility model provides a wireless transmission's foundation ditch precipitation variable frequency control system, includes foundation ditch (1), precipitation well (11) and inspection well (12), characterized by: the device also comprises a liquid level control unit (2) and a liquid level monitoring unit (3), wherein the liquid level control unit (2) is arranged in each dewatering well (11); a liquid level monitoring unit (3) is arranged in each observation well (12). A method for using a wireless transmission foundation pit precipitation frequency conversion control system comprises a, arranging; b. presetting; c. draining; d. transmitting; e. controlling; f. stopping the machine; g. and (6) repeating. The invention has the advantages of convenient construction, reliable transmission and accurate control.
Description
Technical Field
The invention relates to the field of control for reducing underground water level, in particular to a wireless-transmission foundation pit dewatering variable-frequency control system and a use method thereof.
Background
During basic construction, generally pumping water through the dewatering well, adjusting the pumping speed of a dewatering well water pump by combining the water level condition of the observation well, and finally keeping the integral underground water level of the foundation pit within a designed value range. The water pumps in the dewatering wells all need to be connected with cables to obtain power supply. In addition, in order to master the overall underground water level condition of the foundation pit, the water levels of the dewatering well and the observation well need to be monitored in real time, the monitor device also needs to be connected with a power line, and monitoring data also needs to be transmitted to the gateway and the field industrial personal computer through a signal line. The cable required by precipitation is long and is widely distributed on a construction site, construction is affected, safety is achieved, and meanwhile the cable is easy to break or crush in construction to cause system failure.
The operation of a water pump in the precipitation well is generally controlled by a switching power supply, a switch is turned on when precipitation is needed, and the switch is turned off when the water level reaches a designed value. However, the water level changes all the time along with excavation of the foundation pit, and cannot be accurately predicted, so that the water pump controlled by the switching power supply needs to be frequently opened and closed, the water pump controlled by the switching power supply cannot always cope with the water level changing all the time through simple starting and stopping, and the control of the water level is often in a lagging state. The water pump controlled by the switching power supply often leads to excessive water pumping due to untimely closing, and the reasonable control effect cannot be achieved, or after some dewatering wells pump water, the water pump continues to idle, so that the phenomenon of burning out is caused.
Disclosure of Invention
The invention discloses a wireless transmission foundation pit dewatering variable frequency control system and a using method thereof, and aims to overcome the defects of the prior art and provide underground water control equipment which is convenient to construct, reliable in transmission and accurate in control.
The invention achieves the purpose by the following technical scheme:
the utility model provides a wireless transmission's foundation ditch precipitation variable frequency control system for monitor foundation ditch, characterized by: still include precipitation well and observation well, dig five at least precipitation wells in the foundation ditch, the many mouths of observation well of outside excavation of foundation ditch, each mouthful of observation well centers on outside the foundation ditch in proper order, characterized by: also comprises a liquid level control unit and a liquid level monitoring unit,
each precipitation well is internally provided with a liquid level control unit, each liquid level control unit comprises a water pump, a liquid level meter, a flowmeter, a data acquisition module, a wireless transmission module and a controller, a water pumping port and the liquid level meter of the water pump are arranged under the liquid level of the precipitation well, the flowmeter is arranged in a water outlet of the water pump, the water outlet of the water pump is connected with a main drainage pipe, the data acquisition module, the wireless transmission module and the controller of the liquid level control unit are packaged into a whole to form a liquid level control microprocessor, the liquid level meter and the flowmeter are connected with the data acquisition module through signal lines, the controller is respectively connected with the water pump, the data acquisition module and the wireless transmission module through signal lines, a protective cover is arranged outside the liquid level control microprocessor, and the;
all be equipped with the liquid level monitoring unit in every observation well, the liquid level monitoring unit includes level gauge, data acquisition module, wireless transmission module and controller, and the level gauge passes through signal line connection data acquisition module, and data acquisition module and wireless transmission module are connected respectively to the controller passing through signal line, and the data acquisition module of liquid level monitoring unit, wireless transmission module and controller encapsulation become an organic whole and constitute liquid level monitoring microprocessor jointly, liquid level monitoring microprocessor is equipped with the protection casing outward, one side of observation well is located to liquid level monitoring microprocessor.
Wireless transmission's foundation ditch precipitation variable frequency control system, characterized by: the water pump is driven by a variable frequency motor.
The use method of the wireless transmission foundation pit dewatering frequency conversion control system is characterized in that: the method is implemented in sequence according to the following steps:
a. arranging: arranging a liquid level control unit in each dewatering well in the foundation pit, enabling a water pumping port and a liquid level meter of a water pump to be arranged below the liquid level of the dewatering well, arranging a flowmeter in a water outlet of the water pump, enabling the water outlet of the water pump to be connected with a main drainage pipe, enabling the liquid level meter and the flowmeter to be connected with a data acquisition module of a liquid level control microprocessor through signal lines, connecting the liquid level control microprocessor and the water pump through the signal lines, and enabling the liquid level control microprocessor to be arranged on one side of the dewatering well;
arranging a liquid level monitoring unit in each observation well outside the foundation pit, connecting a liquid level meter with a data acquisition module of a liquid level monitoring microprocessor through a signal line, and arranging the liquid level monitoring microprocessor at one side of the observation well;
b. presetting: the controller of each liquid level control unit and the controller of each liquid level monitoring unit are connected with each other through respectiveThe wireless transmission module is connected with a master control computer, and various control parameter parameters are preset on the master control computer according to an underground water level control method specified by a design file, wherein the control parameters comprise: height H of single precipitation, unit m, precipitation speed v per hour, unit m/hour, water pumping quantity Q per hour of single water pump, unit m3/hour；
c. Draining: the master control computer sends a starting instruction, and the controller of the liquid level control unit receives the starting instruction and then controls the motor of the water pump to drive the water pump to operate, so that underground water in the precipitation well is discharged to the drainage main pipe;
d. and (3) transmission: the controller of the liquid level control unit controls a data acquisition module of the liquid level control unit to acquire liquid level data and flow data measured by a liquid level meter and a flow meter according to specified frequency, the controller of the liquid level monitoring unit controls the data acquisition module of the liquid level monitoring unit to acquire the liquid level data measured by the liquid level meter according to the specified frequency, and each controller wirelessly uploads the liquid level data and the flow data to the master control computer and the cloud end through a wireless transmission module so as to be capable of checking and controlling in the master control computer;
e. controlling: the liquid level data of all precipitation wells and observation wells are gathered and analyzed by the general control computer, the real-time water level heights of all precipitation wells and observation wells are gathered, the precipitation speed per hour is calculated and analyzed, the residual precipitation height is estimated, the precipitation time is estimated, the precipitation operation is controlled by combining the arrangement of the foundation pit construction procedures, the rotating speed of a water pump motor is controlled by a controller of each liquid level control unit through a water level speed adjusting method based on peripheral node information, and therefore the water pump is driven to pump water at reasonable water pumping quantity all the time, and the influence factors of the precipitation speed comprise: the water pump draws water ability, earth's surface settlement monitoring data, foundation ditch construction process etc. reasonable volume of drawing water needs to satisfy at least following three index: the pumping power of the water pump does not exceed 80% of the rated power; the surface subsidence monitoring data do not exceed the monitoring alarm value in the design file; the water level is not lower than the water level required by design after 24 hours of precipitation before excavation of the foundation pit, the controller analyzes the variation of the liquid levels of the precipitation well and the observation well in real time, and liquid level data are uploaded to the master control computer through the wireless transmission module;
f. stopping the machine: when the liquid level of the dewatering well is close to a design value, a controller of the liquid level control unit fixes the liquid level state in a locking range according to the liquid level data of the dewatering well and the water pumping flow data of the water pump and by combining the liquid level data and the water pumping flow data of the adjacent dewatering well for comparison, and corresponds to a preset control parameter by using the locking range value, so that the water pump is accurately controlled to be stopped slowly;
g. repeating: and (d) along with the construction of the foundation pit, when the master control computer monitors that a certain precipitation well needs precipitation again, performing precipitation again according to the steps c-f.
The invention provides a wireless-transmission foundation pit dewatering variable-frequency control system which has a function of wirelessly transmitting data and adopts a water level rate adjusting method based on peripheral node information to accurately control a water pump. Specifically, the invention has the following beneficial effects:
1. wireless transmission:
data transmission realizes on-site wireless ad hoc network control through wireless communication technologies such as LoRa and the like, and a water pump of each water lowering point is independently controlled by an on-site main control computer.
All observation points are powered by batteries, all precipitation points are connected with water pump power supply cables, namely 220V mains supply which is pre-arranged for the water pump work on site, and the whole monitoring device does not need to be additionally provided with power supply cables.
By means of the method, the reliability of data transmission and the convenience of field construction are greatly improved.
2. Frequency conversion control:
the flow of the water pump at the precipitation point is controlled by adopting a water level rate adjusting method based on peripheral node information, the control of the water level can be infinitely close to a design value, once the water level changes, the water level can be slowly started and stopped in time in a smooth control mode, and the water level is always kept within the range of the design value. The phenomenon of excessive water pumping and idling caused by the overshoot of the water pump is prevented.
In addition, the invention can automatically calculate the water pump running speed of each water dropping point through the real-time water level of each water dropping point and the observation point, thereby achieving the purpose of reasonably controlling the water level of each point.
Compared with the mode of controlling the water pump by a common switching power supply, the invention not only can ensure the safe operation of the equipment, but also can more accurately and intelligently control the water level.
Drawings
FIG. 1 is a schematic layout diagram of a foundation pit, a dewatering well and an observation well in the invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a schematic view of the connection of the liquid level control unit of the present invention;
FIG. 4 is a schematic view of the connection of the liquid level monitoring unit of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
The utility model provides a wireless transmission's foundation ditch precipitation variable frequency control system for monitor foundation ditch 1, including precipitation well 11, observation well 12, liquid level control unit 2 and liquid level monitoring unit 3, as shown in fig. 1 ~ 4, concrete structure is:
as shown in fig. 1: at least five dewatering wells 11 are excavated in the foundation pit 1, a plurality of observation wells 12 are excavated on the outer side of the foundation pit 1, and each observation well 12 sequentially surrounds the foundation pit 1;
as shown in fig. 2: each dewatering well 11 is internally provided with a liquid level control unit 2, and the liquid level control unit 2 is shown in figure 3: the liquid level control unit 2 comprises a water pump 21, a liquid level meter 22, a flow meter 23, a data acquisition module 24, a wireless transmission module 25 and a controller 26, wherein a water pumping port of the water pump 21 and the liquid level meter 22 are arranged below the liquid level of the dewatering well 11, the flow meter 23 is arranged in a water outlet of the water pump 21, the water outlet of the water pump 21 is connected with the main drainage pipe 4, the data acquisition module 24, the wireless transmission module 25 and the controller 26 of the liquid level control unit 2 are packaged into a whole to form a liquid level control microprocessor, the liquid level meter 22 and the flow meter 23 are connected with the data acquisition module 24 through signal lines, the controller 26 is respectively connected with the water pump 21, the data acquisition module 24 and the wireless transmission module 25 through signal lines, a protective cover is arranged outside the liquid level control microprocessor, and the;
as shown in fig. 2: each observation well 12 is internally provided with a liquid level monitoring unit 3, and the liquid level monitoring unit 3 is shown in fig. 4: liquid level monitoring unit 3 includes level gauge 22, data acquisition module 24, wireless transmission module 25 and controller 26, and level gauge 22 passes through signal line connection data acquisition module 24, and data acquisition module 24 and wireless transmission module 25 are connected respectively to controller 26 passing through signal line, and data acquisition module 24, wireless transmission module 25 and the encapsulation of controller 26 of liquid level monitoring unit 3 become an organic whole and constitute liquid level monitoring microprocessor jointly, liquid level monitoring microprocessor is equipped with the protection casing outward, one side of inspection well 12 is located to liquid level monitoring microprocessor.
In this embodiment: the water pump 21 is driven by a variable frequency motor.
When the method is used, the steps are implemented in sequence as follows:
a. arranging: arranging a liquid level control unit 2 in each dewatering well 11 in the foundation pit 1, enabling a water pumping port and a liquid level meter 22 of a water pump 21 to be arranged below the liquid level of the dewatering well 11, arranging a flow meter 23 in a water outlet of the water pump 21, enabling the water outlet of the water pump 21 to be connected with a main drainage pipe 4, enabling the liquid level meter 22 and the flow meter 23 to be connected with a data acquisition module 24 of a liquid level control microprocessor through signal lines, enabling the liquid level control microprocessor to be connected with the water pump 21 through the signal lines, and enabling the liquid level control microprocessor to be arranged on one side of the dewatering well 11;
arranging a liquid level monitoring unit 3 in each observation well 12 outside the foundation pit 1, connecting a liquid level meter 22 with a data acquisition module 24 of a liquid level monitoring microprocessor through a signal line, and arranging the liquid level monitoring microprocessor at one side of the observation well 12;
b. presetting: the controllers 26 of the liquid level control units 2 and the controllers 26 of the liquid level monitoring units 3 are connected with a master control computer through respective wireless transmission modules 25, and various control parameters are preset on the master control computer according to an underground water level control method specified by a design file, wherein the control parameters comprise: height H of single precipitation, unit m, precipitation speed v per hour, unit m/hour, water pumping quantity Q per hour of single water pump, unit m3/hour；
c. Draining: the master control computer sends a starting instruction, the controller 26 of the liquid level control unit 2 receives the starting instruction and then controls the motor of the water pump 21 to drive the water pump 21 to operate, and underground water in the dewatering well 11 is discharged to the drainage main pipe 4;
d. and (3) transmission: the controller 26 of the liquid level control unit 2 controls the data acquisition module 24 of the liquid level control unit 2 to acquire liquid level data and flow data measured by the liquid level meter 22 and the flow meter 23 according to specified frequency, the controller 26 of the liquid level monitoring unit 3 controls the data acquisition module 24 of the liquid level monitoring unit 3 to acquire liquid level data measured by the liquid level meter 22 according to specified frequency, and each controller 26 wirelessly uploads the liquid level data and the flow data to the main control computer and the cloud end through the wireless transmission module 25 so that the main control computer can check and control the liquid level data and the flow data;
e. controlling: the general control computer gathers and analyzes the liquid level data of all precipitation wells 11 and observation wells 12, gathers the real-time water level height of each precipitation well 11 and observation well 12, calculates and analyzes the precipitation speed and the residual precipitation height per hour, estimates the precipitation time, arranges and controls the precipitation operation by combining the foundation pit construction process, and the controller 26 of each liquid level control unit 2 controls the rotating speed of the motor of the water pump 21 by a water level speed adjusting method based on peripheral node information, so that the water pump 21 is driven to pump water with reasonable water pumping quantity all the time, specifically:
grouping the dewatering wells 11 in the foundation pit 1, setting every five dewatering wells 11 as a group, selecting the dewatering well 11 in the center of the group, taking four adjacent dewatering wells 11 around the central dewatering well 11 as a measurement and control group, setting single dewatering height H and water pumping amount Q per hour for each group of dewatering wells 11, stopping the water pump 21 of the central dewatering well 11 when the average dewatering level of the group of dewatering wells 11 reaches a design value of 80% H, and adjusting the water pumping amount of the water pumps 21 per hour of the other four dewatering wells 11 to 50% Q; when the water level of the dewatering well 11 in the center of the dewatering well group 11 reaches the design value of 90% H, the water pumping amount of the water pumps 21 per hour of the other four dewatering wells 11 is adjusted to be 30% Q;
the influence factors of the precipitation speed include: the water pump draws water ability, earth's surface settlement monitoring data, foundation ditch construction process etc. reasonable volume of drawing water needs to satisfy at least following three index: the pumping power of the water pump does not exceed 80% of the rated power; the surface subsidence monitoring data do not exceed the monitoring alarm value in the design file; the water level is not lower than the water level required by design after 24 hours of precipitation before excavation of the foundation pit, the controller 26 analyzes the variation of the liquid levels of the precipitation well 11 and the observation well 12 in real time, and liquid level data are uploaded to the master control computer through the wireless transmission module 25;
f. stopping the machine: when the liquid level of the dewatering well 11 is close to the design value, the controller 26 of the liquid level control unit 2 fixes the liquid level state in the locking range according to the liquid level data of the dewatering well 11 and the water pumping flow data of the water pump 21 and by combining the liquid level data of the adjacent dewatering well 11 with the water pumping flow data for comparison, and corresponds to the preset control parameter by using the locking range value, thereby accurately controlling the water pump 21 to be stopped slowly;
the single precipitation height H and the water pumping amount Q of the single water pump 21 per hour are taken as control targets of the water pump 21, when precipitation is finished by 80% H, the water pumping amount of the water pump 21 is adjusted to 50% Q, and when precipitation is finished by 90% H, the water pumping amount of the water pump 21 is adjusted to 30% Q;
g. repeating: and (4) along with the construction of the foundation pit 1, when the master control computer monitors that a certain precipitation well 11 needs precipitation again, performing precipitation again according to the steps c-f.
Claims (3)
1. The utility model provides a wireless transmission's foundation ditch precipitation variable frequency control system for monitoring foundation ditch (1), characterized by: still include precipitation well (11) and observation well (12), dig five at least precipitation well (11) in foundation ditch (1), the many mouths of observation well (12) of outside excavation of foundation ditch (1), each observation well (12) are around outside foundation ditch (1) in proper order, characterized by: also comprises a liquid level control unit (2) and a liquid level monitoring unit (3),
each dewatering well (11) is internally provided with a liquid level control unit (2), each liquid level control unit (2) comprises a water pump (21), a liquid level meter (22), a flowmeter (23), a data acquisition module (24), a wireless transmission module (25) and a controller (26), a water pumping port and the liquid level meter (22) of the water pump (21) are arranged under the liquid level of the dewatering well (11), the flowmeter (23) is arranged in a water draining port of the water pump (21), a water draining port of the water pump (21) is connected with a water draining header pipe (4), the data acquisition module (24), the wireless transmission module (25) and the controller (26) of the liquid level control unit (2) are packaged into a whole to jointly form a liquid level control microprocessor, the liquid level meter (22) and the flowmeter (23) are connected with the data acquisition module (24) through signal lines, and the controller (26) is respectively connected with the water pump (21), the data acquisition module (24) and the wireless, a protective cover is arranged outside the liquid level control microprocessor, and the liquid level control microprocessor is arranged on one side of the dewatering well (11);
all be equipped with liquid level monitoring unit (3) in every inspection shaft (12), liquid level monitoring unit (3) are including level gauge (22), data acquisition module (24), wireless transmission module (25) and controller (26), data acquisition module (24) are connected to level gauge (22) passing signal line, data acquisition module (24) and wireless transmission module (25) are connected respectively to controller (26) passing signal line, data acquisition module (24), wireless transmission module (25) and controller (26) encapsulation of liquid level monitoring unit (3) become an organic whole and constitute liquid level monitoring microprocessor jointly, liquid level monitoring microprocessor is equipped with the protection casing outward, one side of inspection shaft (12) is located to liquid level monitoring microprocessor.
2. The wireless transmission foundation pit precipitation variable frequency control system of claim 1, wherein: the water pump (21) is driven by a variable frequency motor.
3. The use method of the wireless transmission foundation pit precipitation frequency conversion control system as claimed in claim 1 or 2, characterized in that: the method is implemented in sequence according to the following steps:
①, arranging a liquid level control unit (2) in each dewatering well (11) in the foundation pit (1), enabling a water pumping port and a liquid level meter (22) of a water pump (21) to be arranged below the liquid level of the dewatering well (11), arranging a flow meter (23) in a water outlet of the water pump (21), enabling the water outlet of the water pump (21) to be connected with a drainage main pipe (4), enabling the liquid level meter (22) and the flow meter (23) to be connected with a data acquisition module (24) of a liquid level control microprocessor through signal lines, connecting the liquid level control microprocessor with the water pump (21) through the signal lines, and enabling the liquid level control microprocessor to be arranged on one side of the dewatering well (11);
arranging a liquid level monitoring unit (3) in each observation well (12) outside the foundation pit (1), connecting a liquid level meter (22) with a data acquisition module (24) of a liquid level monitoring microprocessor through a signal line, and arranging the liquid level monitoring microprocessor at one side of the observation well (12);
② presetting, connecting the controllers (26) of the liquid level control units (2) and the controllers (26) of the liquid level monitoring units (3) with a master control computer through respective wireless transmission modules (25), presetting various control parameters on the master control computer according to an underground water level control method, wherein the control parameters comprise single precipitation height, precipitation speed per hour and water pumping amount per hour of a single water pump;
③, draining, namely, the master control computer sends a starting instruction, the controller (26) of the liquid level control unit (2) receives the starting instruction and then controls the motor of the water pump (21) to drive the water pump (21) to operate, and underground water in the dewatering well (11) is drained to the drainage main pipe (4);
④, transmitting, wherein a controller (26) of the liquid level control unit (2) controls a data acquisition module (24) of the liquid level control unit (2) to acquire liquid level data and flow data measured by a liquid level meter (22) and a flow meter (23) according to specified frequency, the controller (26) of the liquid level monitoring unit (3) controls the data acquisition module (24) of the liquid level monitoring unit (3) to acquire the liquid level data measured by the liquid level meter (22) according to the specified frequency, and each controller (26) wirelessly uploads the liquid level data and the flow data to a main control computer and a cloud terminal through a wireless transmission module (25);
⑤, the general control computer collects and analyzes the liquid level data of all precipitation wells (11) and observation wells (12), collects the real-time water level heights of each precipitation well (11) and each observation well (12), calculates and analyzes the precipitation speed and the residual precipitation height per hour, estimates the precipitation time, arranges and controls the precipitation operation by combining the foundation pit construction procedure, the controller (26) of each liquid level control unit (2) controls the rotating speed of the motor of the water pump (21) by a water level speed adjusting method based on peripheral node information so as to drive the water pump (21) to pump water at a reasonable amount all the time, the controller (26) analyzes the variable quantity of the liquid levels of the precipitation wells (11) and the observation wells (12) in real time, and the liquid level data is uploaded to the general control computer through the wireless transmission module (25);
⑥ stopping the machine, when the liquid level of the precipitation well (11) is close to the design value, the controller (26) of the liquid level control unit (2) compares the liquid level data of the precipitation well (11) with the water pumping flow data of the water pump (21) by combining the liquid level data and the water pumping flow data of the adjacent precipitation well (11) to fix the liquid level state in the locking range, and the locking range value is corresponding to the preset control parameter, thereby accurately controlling the water pump (21) to stop slowly;
taking the single precipitation height H and the hourly water pumping quantity Q of a single water pump as water pump control targets, adjusting the water pumping quantity of the water pump to 50% Q when precipitation is finished by 80% H, and adjusting the water pumping quantity of the water pump to 30% Q when precipitation is finished by 90% H;
⑦ repeating the steps that when the general control computer monitors that a precipitation well (11) needs precipitation again along with the construction of the foundation pit (1), the precipitation is carried out again according to the steps ③ - ⑥.
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| CN111852834A (en) * | 2020-07-31 | 2020-10-30 | 上海广联环境岩土工程股份有限公司 | Water pump management and control method for foundation pit dewatering system |
| CN112459042A (en) * | 2020-11-16 | 2021-03-09 | 上海勘察设计研究院(集团)有限公司 | Automatic precipitation control method and device for foundation reinforcement |
| CN112854270A (en) * | 2021-03-01 | 2021-05-28 | 沈阳帝铂建筑工程有限公司 | Intelligent water descending management and control system and operation method |
| CN113373961A (en) * | 2021-06-07 | 2021-09-10 | 上海城建市政工程（集团）有限公司 | Automatic water level stabilizing system for dewatering well |
| CN114859811A (en) * | 2022-07-07 | 2022-08-05 | 中建安装集团有限公司 | PLC-based intelligent water drainage control system and method |
| CN115387367A (en) * | 2022-08-29 | 2022-11-25 | 中建八局第三建设有限公司 | Remote intelligent foundation pit dewatering control method based on 5G internet of things technology |
| CN115492142A (en) * | 2022-06-25 | 2022-12-20 | 中建五局土木工程有限公司 | Monitoring and control system for uneven dewatering and draining of large-scale deep foundation pit |
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