Pile body freezing and pulling force testing device

Abstract

The invention discloses a pile body freezing and pulling force testing device. The device comprises a model box, a water tank, a cold bath box, a heat insulation box, a sensor preformed hole, a permeable partition plate, a water supplementing bottle, a dynamometer, a test pile and a data collector, scales are marked on an inner side of the model box, and a sensor hole is reserved in a side face. The permeable partition plate is fixedly mounted in the model box; the water tank is arranged at the bottom in the model box; the dynamometer is mounted on a dynamometer connecting base; the test pileis fixedly installed on the dynamometer, a hydrothermal sensor is installed in the sensor preformed hole, the cold bath box is fixedly installed at the bottom of the model box, the water supplementingbottle is communicated to the water tank through a pipeline, and the dynamometer and the hydrothermal sensor are externally connected to the data collector through wires respectively. The testing device is easy to manufacture and clear in principle, and compared with a traditional strain gauge, the principle that the dynamometer is used for measuring the freezing-pulling force of the pile body ismore reliable, and results are more accurate.

Description

Technical field: [0001] The invention belongs to the field of indoor model testing of frozen soil mechanics, and in particular relates to a test device for freezing and pulling force of piles. Background technique: [0002] Frozen pulling mainly occurs in shallow buried and light-weight columnar foundations or structures in cold regions, such as utility poles, shallow and thin pile foundations of solar panels in photovoltaic power generation, etc. There will be freezing and pulling force as an additional force to destroy the overall structure of the pile foundation, which will bring potential risks to the project. [0003] In structures in cold regions, the pile foundation is in direct contact with the soil. When the air temperature reaches negative temperature, the upper soil around the pile first reaches the freezing temperature, begins to freeze, and expands in volume. Under the action of the negative temperature gradient, the lower soil is not frozen. Moisture will migr...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: in view of the shortcomings of the unreliable test principle of the above-mentioned original technology and the inaccurate test of the freeze-pull force of the prior art, a kind of pile freeze-pull force test device and test method are proposed, and the test principle must be reliable. , can adapt to a variety of pile types, meet the conditions of water replenishment and temperature control during the test, can simulate actual working conditions, and can monitor the change law of freezing and pulling force in real time

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