A pressure test structure and test method for deep and long bored piles

Abstract

The invention discloses a pressure test structure for a long bored cast-in-situ pile and a test method. The pressure test structure comprises a toroidal main reinforcement fixed on the cast-in-situ pile, a plurality of soil pressure box protecting and fixing devices arranged on the outer side of the main reinforcement, and a plurality of soil pressure box fixing device inter-connecting parts used for fixedly connecting every two adjacent soil pressure box protecting and fixing devices, wherein each soil pressure box fixing device inter-connecting part is locked and fixed on the outer side of the main reinforcement by a positioning and locking device; and a soil pressure box is mounted in each soil pressure box protecting and fixing device, and when the cast-in-situ pile is cast and formed in a deep and long drilling hole, the soil pressure boxes are kept in reliable contact with the outer wall surface of the cast-in-situ pile and soil around the cast-in-situ pile. The pressure test structure is easy to implement, simple to operate, favorable in effect, low in manufacturing cost and wide in application range.

Description

technical field [0001] The invention relates to a pressure test structure and a test method of deep and long bored cast-in-place piles, belonging to the field of building structure tests. Background technique [0002] Pile is a commonly used foundation type mainly used to bear the upper load and meet certain vertical displacement requirements. The bearing capacity of the pile foundation is mainly achieved through the supporting force of the pile tip and the frictional resistance of the pile side. When the formation lithology is not ideal, such as deep and thick soft soil formation, it is difficult to obtain reliable pile end bearing force, so the diameter and length of the pile are increased in exchange for greater pile side friction. The two key factors affecting the magnitude and performance of the pile side frictional resistance are the pile side soil pressure and the friction performance between the pile and soil. The latter can be easily obtained by indoor experiments....

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Problems solved by technology

[0007] However, the theoretical analysis and numerical simulation methods cannot reflect the real working state of the pile, and the pile side soil pressure obtained is only an approximate solution, and there are situations that deviate from the actual situation. In addition, the artificial embedded soil pressure box is only suitable for short piles and convenient Pile foundation types of artificial activities, such as artificially dug holes

[0008] The length of the existing large-diameter deep and long cast-in-situ piles has exceeded 50m, and there are uncertainties in the strata they pass through. The above three methods cannot meet the requirements of obtaining accurate soil pressure on the side of the pile.

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