Full-scale testing apparatus for spread foundations

Abstract

The invention discloses a full-scale testing apparatus for spread foundations. The full-scale testing apparatus comprises a foundation pit and a hydraulic static pile press. Base reaction measuring devices which are buried in a backfilled soil layer are arranged at the bottom of the foundation pit, a spread foundation test piece is arranged above the base reaction measuring devices, a force transfer short column is mounted on the top of the spread foundation test piece, a strain measuring device is arranged on the spread foundation test piece, and a force transfer plain concrete pile which is positioned above the force transfer short column is clamped at a jaw of the hydraulic static pile press. The full-scale testing apparatus has the advantages that reaction frame jack systems are replaced by the hydraulic static pile press, accordingly, the experimental efficiency of full-scale tests for concrete spread foundations with large width-height ratios can be effectively improved, the cost can be saved, and the time can be shortened; fine sand with the thickness ranging from 4 centimeters to 10 centimeters needs to be arranged on steel-wire soil pressure cells, so that stress can be effectively distributed, and the test precision can be improved; a rigid pressure plate is welded on the top of the spread foundation test piece, accordingly, sections of pillars can be simulated, and load applied by the force transfer short column can be uniformly transmitted to the spread foundation test piece.

Description

technical field [0001] The invention relates to the design field of a concrete extended foundation of a power transmission line, in particular to a full-scale test device for an extended foundation. Background technique [0002] Currently, concrete extension foundations are one of the main forms of transmission line towers. In the construction of UHV transmission lines, the foundation cost accounts for 16% to 20% of the total investment, so the optimal design of the foundation plays an important role in saving the construction period and cost. [0003] Reducing the excavation depth of the foundation soil, that is, reducing the height of the foundation steps, can greatly reduce the cost and speed up the construction period from an economic point of view. However, the concrete extended foundation strictly complies with the current national industry standard that the step width-to-height ratio does not exceed 2.5, so if the height of the foundation steps is reduced, the step w...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a full-scale test device for an extended foundation aiming at the defects of the traditional full-scale test device for an extended concrete foundation, so as to solve the problem of the expansion of the traditional full-scale test device for an extended concrete foundation with an aspect ratio greater than 2.5. When testing the foundation, it is necessary to set up reaction frames and jacks in a large area, which causes waste of time and increases the cost of the test

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