Optical fiber type temperature self-compensating static cone penetration sensor

Abstract

The invention discloses an optical fiber type temperature self-compensating static cone penetration sensor, including a cone head and a friction cylinder integrally assembled with the cone head.The sensor further comprises a guiding-connecting rod, the guiding-connecting rod is internally provided with a cavity, the two ends of the guide-connecting rod are correspondingly provided with a through-wire hole and a pillar guide hole, andthe two holescommunicate with the cavity; the direction end, close to the pillar guide hole of the guiding-connecting rod, of the guiding-connecting rod is arranged in the friction cylinder, and the position, on the cone head, of the friction cylinder is fixedly provided with a force transmitting column and a rubber ring, the force transmitting column extends into the column guide hole, and the direction end, close to the pillar guide hole, of the guiding-connecting rod is abutted against the rubber ring; a pressure sensing beam is arranged in the cavity, one end of the pressure sensing beam is abutted against the inner wall of the cavity, and the other end is abutted against the force transmitting column; and fiber grating is pasted on the pressure sensing beam, and the fiber grating is connected with communication fiber, and the communication fiber extends out from the cavity through the through-wire hole. According to the optical fiber type temperature self-compensating static cone penetration sensor, the disadvantages that a sensor of the traditional static cone penetrometer is prone to being damaged during using in a groundwater environmentfor a long time, diseconomy and delaying construction exist are overcome.

Description

technical field [0001] The invention belongs to the field of static penetrating sounding devices for geotechnical engineering surveys, and in particular relates to a device capable of effectively determining soil parameters by using optical fiber sensing technology, mechanically stratifying foundation soil and distinguishing soil types, determining shallow foundation bearing capacity, single Fiber-optic temperature self-compensating static penetration sensors for vertical bearing capacity of piles. Background technique [0002] Static CPT technology refers to using a pressure device to press a penetrating rod with a probe into the test soil layer, and through the measurement system to test the cone tip resistance and side wall friction resistance of the soil, some basic physical properties of the soil can be determined. Mechanical properties, such as the deformation modulus of the soil, the allowable bearing capacity of the soil, etc. The static penetration technology has a...

AI Technical Summary

Problems solved by technology

In recent years, with the rapid development of sensor technology, many new static penetration technologies have appeared. These new inventions and applications have milestone significance for the development of engineering geological exploration and testing technology, and have become the original technology of geotechnical engineering industry. However, the widely used static penetrometer is mainly based on electric measuring type. The sensor adopts strain gauge sensor. It is used in the groundwater environment for a long time, which not only makes the sensor easy to damage, but also affects the test accuracy. , thus having a great impact on the construction of the project

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