Automatic internal pressure alarm system of sealing film used in vacuum combined surcharge preloading

Abstract

The invention discloses an automatic internal pressure alarm system of a sealing film used in vacuum combined surcharge preloading. A pressure gauge of a vacuum preloading device is an electric contact pressure gauge; a normally-open contact of the electric contact pressure gauge is connected in parallel with one auxiliary normally-open contact of an intermediate relay and is then connected in series with a normally-closed contact of a reset button to a coil power supply loop of the intermediate relay; and another auxiliary normally-open contact of the intermediate relay is connected in series to a power supply loop of an audible and visual alarm. According to the automatic internal pressure alarm system, a structure that the electric contact pressure gauge and the audible and visual alarm work cooperatively is adopted, when the vacuum pressure is reduced to a set value, the audible and visual alarm is immediately started, and an operator on duty begin to check gas leak points at the first time, so the project quality is benefited; and meanwhile, the time, the machine fee and the electric charge needed by re-arriving at a design pressure are decreased, and the construction cost is reduced. Furthermore, the automatic alarm system has a simple structure, the mounting is convenient, the labor intensity is reduced to a great degree, the work efficiency is improved, the labor input is little, the cost is low, and the labor power, the material resources and the financial resources are saved.

Description

technical field [0001] The invention relates to an automatic alarm system, in particular to an automatic alarm system for pressure inside a vacuum combined surcharge preload sealing membrane. Background technique [0002] Most of the coastal areas in southern my country are silty coasts, and the soil layers are mostly silt, silty clay, silty loam and silt mixed sand layers, which belong to saturated normal compacted soft clay. This type of soil has the characteristics of high water content, high compressibility, poor permeability, high sensitivity, low strength and uneven thickness. The vacuum surcharge combined preloading method is a new technology for soft soil foundation reinforcement developed in recent years. The vacuum combined surcharge preloading method is safe and reliable, and the treatment effect is good. At present, this method is widely used in transportation, ports, water conservancy and other fields. [0003] The effect of vacuum preloading has a great relati...

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Problems solved by technology

[0004] At present, the conventional method is to judge whether there is a problem with the sealing membrane by inspectors watching the value of the pressure gauge. The pressure decreases for a long time, which brings more difficulties in analyzing and judging the cause of the problem. Large, labor costs are high, and the quality of the project is difficult to guarantee

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