Device and method for measuring lateral frictional resistance of clay strata

Abstract

The invention discloses a side friction resistance measuring device and a measuring method of clay ground, comprising a clay scraping mechanism and a measuring mechanism; the clay scraping mechanism comprises an upper box, a jack, a connecting rod, a gear, two sawtooth plates, a scraper and a The protective plate, the upper end of the connecting rod is fixed with the jack, the gear is hinged on the lower end of the connecting rod, the two sides of the gear are meshed with two sawtooth plates respectively, the scraper is arranged on the lower side of a sawtooth plate, and the lower end of the scraper is attached to the measuring panel On the outside; the measuring mechanism includes a lower box, a tension and pressure sensor, a force transmission block, a sliding rail and a friction plate, the force transmission block is fixed at the bottom of the tension and pressure sensor, the sliding rail is fixed on the inner side of the lower box body, and the friction plate is arranged at the opening of the lower box body side. The measurement method includes the following steps: 1) calibrating the measuring mechanism; 2) measuring the side friction resistance; 3) verifying the error. The invention can accurately measure the side wall friction resistance value of each soil layer with different depths, and can also solve the test of the side wall friction resistance when the clay layer soil body sinks in a wrapping type.

Description

technical field [0001] The invention relates to a stratum side friction resistance measuring device, in particular to a device which can accurately measure the side wall friction resistance values ​​of different depths and various strata, and belongs to the technical field of building construction equipment. Background technique [0002] With the development of bridge engineering construction, more and more large-span bridge projects are being constructed, and the size and depth of caisson foundations and pile foundations are larger. When faced with complex geological conditions, the soil friction resistance of the sidewall becomes the The key factor in sinking. At present, in the construction process of caisson sinking, the earth pressure gauge is used to measure the friction resistance of the side wall, but the measurement accuracy is not high, the earth pressure gauge is easily damaged, and the friction coefficient of each layer is difficult to accurately measure. It is ...

AI Technical Summary

Problems solved by technology

At present, during the construction process of caisson sinking, earth pressure gauges are used to measure the frictional resistance of the side wall, but the measurement accuracy is not high, the earth pressure gauge is easily damaged, and it is difficult to accurately measure the friction coefficient of each stratum. It is difficult to re-measure at the same position to obtain the side wall friction value, and when the caisson sinks in the clay stratum, the soil will adhere to the well wall and subside in a wrapping manner. It is difficult for general measuring devices to accurately measure the subsidence. Friction resistance of sidewall when well sinks in clay formation

The side friction resistance of pile foundation is usually determined by static load test or self-balancing device, but the equipment is large in size and the test method is complicated, so it is impossible to obtain the side friction resistance of the subsidence process and soil layers at different depths conveniently and accurately

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