Combined load loading device for pile foundation in field testing

Abstract

The invention relates to a combined load loading device for a pile foundation in field testing. The combined load loading device is used for applying combined loads to single piles and pile groups in the loading and unloading process in various fields. The loading device comprises a vertical loading assembly, a horizontal loading assembly, a test pile vertical deformation measuring assembly and a test pile horizontal deformation measuring assembly, wherein the vertical loading assembly is used for applying vertical loads to the pile foundation in field testing, the horizontal loading assembly is used for applying horizontal loads to the pile foundation in field testing, the test pile vertical deformation measuring assembly is used for measuring the deformation after vertical loading of the test pile, and the test pile horizontal deformation measuring assembly is used for measuring the deformation after horizontal loading of the test pile. Compared with the prior art, the limitation of the singular loading direction in field loading tests through original test devices of the type is broken through, combined load tests can be carried out on various types of pile foundations in field testing, vertical and horizontal loads which are randomly combined can be applied in different loading sequences, and therefore the combined bearing performance of the pile foundation can be better analyzed.

Description

technical field [0001] The invention relates to an on-site loading test device, in particular to a loading test device capable of carrying out different loading sequences and different combined loads on the on-site test pile foundation. Background technique [0002] With the construction of buildings (structures) such as high-rise buildings, bridges and towers, the combined loads from the upper part of the single pile have been paid more and more attention in engineering practice. The combined load is the load in which the vertical load, horizontal load and moment load acting on the pile body above the ground are combined in any form. Under the combined load, the vertical load affects the resistance of the soil around the pile, and at the same time, due to the occurrence of pile deflection, additional bending moments are generated, which in turn affects the horizontal bearing capacity of the pile, and the horizontal load causes the horizontal deformation of the pile body, wh...

AI Technical Summary

Problems solved by technology

However, the loading device of the combined load currently used is usually relatively complicated. For example, Chinese patent ZL201410328079.0 discloses a horizontal and vertical loading device for pile foundation model tests, including a model box. For the same sandy soil, the top of the model box is provided with a positioning device, and the positioning device adjusts the position of the model pile in the model box, and the vertical loading device applies a vertical load to the model pile, and the lateral loading device applies a vertical load to the model pile. Model piles apply lateral loads

However, although this patent can carry out lateral loading test and vertical loading test on the indoor model pile foundation well, it cannot meet the field test requirements due to the large number of components and the need for the wall as the carrier of the lateral loading device.

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