Sampling detection device and method for vacuum degree under vacuum prepressing film

Abstract

The invention discloses a vacuum preloading under-film vacuum degree sampling detection device and method, the device comprises a base, a sleeve and a measuring rod, the sleeve is fixed on the base, and the measuring rod is arranged in the sleeve and extends to pass through the base; one end of the measuring rod is provided with a pointed-cone-shaped anchor head so as to penetrate through the sealing film in the vacuum degree testing area and be inserted into the sand cushion layer for vacuum degree measurement, the other end of the measuring rod is provided with a vacuum degree measuring device, the measuring rod is of a hollow structure, and a plurality of holes are formed in the measuring rod close to the pointed-cone-shaped anchor head. The device is simple in structure, easy and convenient to install and operate, capable of achieving overwater operation, safe and convenient. The invention further provides a vacuum preloading under-film vacuum degree sampling detection method, the method is simple to operate, reliable and effective sampling detection of the under-film vacuum degree can be achieved, the sealing film is effectively blocked after detection is completed, and the sealing performance of the sand cushion layer is guaranteed.

Description

technical field [0001] The invention relates to the field of measuring the degree of vacuum preloading, in particular to a device and method for sampling and detecting the degree of vacuum under a vacuum preloading film. Background technique [0002] Since the 1980s, the vacuum preloading method has been widely used and researched in my country to strengthen weak foundations, making my country's various vacuum preloading technologies and research results in the leading position in the world. With the rapid development of my country's economy, the demand for land resources in most coastal cities has increased sharply, and large-scale land reclamation has become the best solution at present, which further promotes the development of vacuum preloading technology for dealing with weak foundations. In the actual project of vacuum preloading, the supervisor and the owner have the need to conduct sampling inspections on the vacuum degree under the film on site to test the effect of...

AI Technical Summary

Problems solved by technology

[0003] However, there are many technical difficulties in the demand for sampling and testing the vacuum degree under the vacuum preloading site.

One: The vacuum preloading method requires a water coverage depth of 0.5m on the sealing film, and inspection personnel need to carry out underwater operations, and there is a danger of electrical leakage in the water, which will cause potential safety hazards for personnel; When the pressure is carried out, the soil will settle with large uneven compression, resulting in large fluctuations in the bottom of the site, and some water depths can reach 1.5m, making the operation difficult; third, the inspectors break the sealing film in the water, because Vacuum negative pressure will inevitably cause water to be sucked into the sealing membrane; Fourth, after the test is completed, the sealing membrane must be sealed in water, which is technically difficult

At present, there is no reliable device and method for underwater sampling detection of vacuum degree under vacuum precompression film

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