Pile foundation detection The purpose and significance of
First: Vertical Compressive Static Load Test of single pile
Detection method: it is a test method by applying vertical pressure to the top of the pile to observe the settlement at the top, and to determine whether the vertical compressive bearing capacity of single pile can reach the national standard range, also known as single pile vertical compressive static load detection.
Test purpose: mainly to determine the ultimate bearing capacity of single pile vertically, so as to judge whether the vertical compressive bearing capacity can meet the design requirements.
Second: single pile vertical uplift static load detection
Detection method: Contrary to compressive static load test, the pile foundation detection method is to observe the uplift displacement generated by the top of the pile by applying upward force to the pile top, and determine the tight uplift bearing capacity of single pile through the displacement.
Detection purpose: determine the ultimate bearing capacity of single pile vertical uplift to judge whether it meets the construction requirements, and determine the uplift resistance through pile internal force and related deformation test.
Third: single pile horizontal static load detection
Detection method: different levels of horizontal thrust are applied to the top of the pile by professional pile foundation testing instruments and equipment, and the horizontal displacement of the top caused by horizontal thrust is used to determine whether the horizontal bearing capacity of single pile meets the standard range.
Detection purpose: it is mainly to confirm the maximum vertical and horizontal thrust range that the single pile can bear, and understand the bending moment change of the pile body through the pile internal force and deformation test, and calculate the pile side earth pressure.
Fourth: core drilling method
Detection method: this kind of detection is a pile foundation detection method by drilling core samples. By detecting the length of the pile, the defects of the pile body and the thickness of the sediment at the bottom of the pile, it can determine whether the strength, continuity or compactness of the concrete of the pile body are good.
Detection purpose: through core drilling pile foundation detection, not only the pile length of cast-in-place pile can be determined, but also the strength of pile body concrete and sediment thickness can be determined, which can provide corresponding reference data for the selection of bearing capacity acceptance test.
There are many kinds of pile foundation detection methods, each of which can achieve different detection purposes. In order to improve the reliability of the test results and reduce the existence of Engineering hidden dangers, the final detection and evaluation of different contents can be carried out according to the high-quality pile foundation detection, and the abnormal pile foundation in the detection process can be identified in time, so as to meet the construction requirements of national standards.