Piezocone penetration test (CPTU) prober of dual-deformed column

Abstract

The invention relates to Piezocone penetration test (CPTU) equipment, in particular relating to CPTU prober of a dual-deformed column. The CPTU prober is characterized by comprising a second deformed column, a friction drum, a first deformed column, a pore water pressure sensor, a permeable filter, a conical head, a first strain gauge and a second strain gauge, wherein the left end of the first deformed column is in threaded connection with the right end of the conical head and the right end of the first deformed column is in threaded connection with the left end of the prober rod; the friction drum is arranged outside the first deformed column; the friction drum and the first deformed column form a closed first chamber and a closed second chamber; the first strain gauge is adhered to the first deformed column; and the second deformed column is positioned in the second chamber, the second strain gauge is adhered to the second deformed column, and the port of a permeable channel on the right end face of the conical head is in threaded connection with the pore water pressure sensor. The CPTU prober is simple and compact in structure, high in measurement accuracy and good in sealability, and can be used for measuring the resistance of the conical head and the frictional force of side walls independently so as to eliminate mutual influence.

Description

technical field [0001] The invention relates to pore pressure static penetrating equipment, which belongs to the technical field of soil in-situ testing. Background technique [0002] For a long time in China, single-bridge static CPT still dominates, and the application of pore pressure static CPT technology is seldom, and only a few units are applying pore pressure static CPT. The main reason for this situation is that the structure of the probe for pore pressure static testing is complex, and the quality of domestic pore pressure probes is not good. The poor quality of the probe not only affects the accuracy of the penetration test results, but also affects the speed of the penetration test. At the same time, It also increases the test cost. Buying probes from abroad is not only expensive, but also takes a long time to repair after failure. [0003] There are still the following problems in domestic pore pressure static penetration probes: [0004] 1. The structure of ...

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Problems solved by technology

[0004] 1. The structure of the domestic hole pressure static penetration probe is relatively complex, and most of them are not suitable for deep hole penetration with a depth greater than 30m, nor are they suitable for hard soil layers

[0005] 2. The domestic pore pressure static penetration probe uses a single deformation column, and the measurement of side wall friction is easily affected by the resistance of the cone tip, resulting in inaccurate measurement results

[0006] 3. The waterproof and sealing performance is not good, and the insulation of the probe is poor, and the circuit is easy to be damp, which leads to the scrapping of the probe

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