Construction method of single pile vertical anti-pull static load test device

Abstract

The invention discloses a construction method of a single pile vertical anti-pull static load test device, and belongs to the field of construction inspection. The construction method of the single pile vertical anti-pull static load test device sequentially comprises the following steps that inclinometer casings are tied symmetrically to the curved neutral surface, located on a pile body, of a to-be-tested pile reinforcement cage; reinforcement meter are symmetrically arranged on the tensioned and pressed main reinforcements away from the neutral axis; pile side soil pressure boxes are symmetrically arranged on the two pairs of force surfaces of the to-be-tested pile, and pile front side soil pressure boxes are distributed in the surface slope direction of the to-be-tested pile; digital readout displacement meters are mounted on the two sides and the middle part of the force surfaces of the to-be-tested pile, and at the same time the digital readout displacement meters are mounted above the force surfaces of the to-be-tested pile; a reaction wall is preset on one side of the to-be-tested pile, and a jack is mounted between the reaction wall and the to-be-tested pile; and a low speed load maintenance method is adopted. According to the construction method of the single pile vertical anti-pull static load test device, the potentials of a foundation and a rock and soil body is fully exerted, or safety of engineering design is improved, and the high efficiency of the foundation of a electric transmission line iron tower foundation is realized.

Description

technical field [0001] The invention relates to the field of construction detection, in particular to a construction method of single pile vertical uplift static load test equipment. Background technique [0002] Pile static load test is a kind of geotechnical engineering in-situ test method. It is a common test method used to test whether engineering piles can meet the design requirements. It is also required by JGJ94 "Technical Specifications for Building Pile Foundations". A test method. The existing static load test methods for foundation piles mainly include single surcharge method, single anti-anchor method and self-balancing method. In the static load test of large-tonnage foundation piles, the single surcharge method requires more concrete blocks , the height of the stacked load is high, so that the center of gravity of the stacked load moves upwards. During the test, a little carelessness will cause the stacked load to collapse, forming a serious safety hazard. Th...

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Problems solved by technology

The existing static load test methods for foundation piles mainly include single surcharge method, single anti-anchor method and self-balancing method. In the static load test of large-tonnage foundation piles, the single surcharge method requires more concrete blocks , the height of the stacked load is high, so that the center of gravity of the stacked load moves upwards. During the test, a little carelessness will cause the stacked load to collapse, forming a serious safety hazard

The self-balancing method is a new type of static load test method for foundation piles. Its principle is to use the weight of the foundation pile itself and the frictional resistance of the soil around the pile above the neutral point of the pile to provide the load. The piles are poured together with the foundation piles. This method does not require a large amount of surcharge, nor does it require reaction piles, but the hydraulic loading system is for one-time use. After the test is completed, the parts of the hydraulic loading system must be grouted twice , the cost is high and the installation is cumbersome. It is suitable for the situation where the soil around the pile is good and can provide sufficient frictional resistance, so the scope of application is limited

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