Foundation pit precipitation automatic starting and stopping device

Abstract

The invention belongs to the technical field of foundation pit precipitation construction, and particularly relates to a foundation pit precipitation automatic starting and stopping device. In the process of precipitation, the amount of water seepage per unit time is slowly reduced, but the water pumping amount per unit time of a water pump is certain, water to be pumped by the water pump does notexist for a certain period of time, the water pump idles, and as a result, the foundation pit precipitation automatic starting and stopping device is damaged; and a pressure sensor senses the increase or decrease of the water level, an intermediate relay acts according to corresponding signals after the corresponding signals are sent by the pressure sensor, a water pump control line is closed orcut off to start or stop water pump operation. In the foundation pit precipitation construction process, by means of the automatic starting and stopping device, operation of the precipitation water pump can be automatically controlled to start or stop, the precipitation efficiency is improved, the workload of construction personnel is reduced, and the precipitation effect is improved.

Description

technical field [0001] The invention belongs to the technical field of foundation pit dewatering construction, in particular to an automatic start-stop device for foundation pit dewatering. Background technique [0002] Foundation pit dewatering means that when the foundation pit is excavated, the groundwater level is higher than the excavation bottom, and the groundwater will continuously seep into the pit, which poses a serious safety threat to the excavation of the foundation pit. In order to ensure that the foundation pit can be constructed under dry conditions and prevent slope Dewatering work due to instability, foundation quicksand, pit bottom uplift, pit bottom piping and foundation bearing capacity decline. [0003] The methods of foundation pit dewatering mainly include: open ditch plus water collection well dewatering, light well point dewatering, jet well point dewatering, electroosmotic well point dewatering, deep well point dewatering, etc. No matter which meth...

AI Technical Summary

Problems solved by technology

[0004] The ultimate purpose of precipitation is to reduce the groundwater level to a certain range below the excavation bottom. During the implementation of foundation pit dewatering, the specific performance is that seepage water is continuously pumped out until the water level drops to the expected requirement; the most ideal pumping state is continuous seepage Constantly pumped away, the water seepage per unit time and the water pumping per unit time maintain a balance, and the water pump maintains a continuous working state; in the actual precipitation process, the water pumping per unit time is always greater than the seepage per unit time, as the precipitation works The difference between pumping water per unit time and water seepage per unit time is continuously enlarged due to reasons such as advancing and lowering of the water level. As a result, after the pump works for a period of time, the seepage water is temporarily completely drained. At this time, the pump has no water to use. pumping, but the water pump is still running. If the water pump is idle for more than a certain period of time and is not found, the water pump motor may be burned, resulting in damage to the water pump; , when it is found that the water output of the pump is reduced, measures should be taken in time, but if the inspection interval is too large or the inspection is not effective, especially the difficulty of inspection at night or the number of inspections is reduced, the probability of damage to the water pump will greatly increase, and the damage will be repaired, and the construction will be increased. Cost, if damaged, it needs to be replaced, suspending foundation pit dewatering, reducing the efficiency of foundation pit dewatering

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