Load-compensation-based large-diameter pile foundation self-balanced detecting method

Abstract

The invention discloses a load-compensation-based large-diameter pile foundation self-balanced detecting method and belongs to the technical field of constructional engineering detection and evaluation. According to the method, firstly, collection of geological survey data in a test pile position is conducted, and arrangement and installation position of a test pile load box are determined initially; then an upper loading face and a lower loading face of the load box and the pile top and the pile end of a test pipe are all provided with steel bar stress strain sensors and displacement meter sensors, a counter-force loading device is arranged at the pipe top of the test pile to provide compensative load possibly needed in a pile foundation test, according to geological survey data, through pile foundation monitoring technology and a load-compensation system, an integrated effective load-compensation-based large-diameter pile foundation self-balanced detecting method is formed. The method is suitable for pile foundation detecting of bridge structures including high-rise or super high-rise or tall building structure pile foundations, or large span continuous beams or large span continuous rigid frame bridges or cable-stayed bridges or suspension bridges.

Description

Technical field:

[0001] The invention relates to a large-diameter pile foundation self-balancing detection method based on load compensation, which belongs to the technical field of construction engineering detection and evaluation. Background technique:

[0002] The self-balanced pile test method is to connect a special loading device-a load box with a steel cage, and embed it in the designated position of the pile (ie, the balance point), and lead the high-pressure tubing and displacement rod of the load box to the ground together. The high-pressure oil pipe is loaded with oil, and the force is transmitted to the pile body through the thick steel plate. This method requires the friction of the upper pile to be balanced with the friction and end resistance of the lower pile—self-balance to maintain the load. According to the upward and downward Q-S curve, the pile bearing capacity, pile foundation settlement, pile elastic compression and soil plastic deformation are judged. [0...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with the embodiments and drawings.

[0025] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, the specific steps of the self-balancing detection method of a large diameter pile foundation based on load compensation of the present invention are as follows:

[0026] (1) Collection of geological survey data at the location of test piles for self-balance testing, said geological survey data including soil layer information and soil parameters, determine the contribution ratio of the test pile end bearing capacity and pile side resistance, and determine the initial test pile The main factors affecting the environment and the bearing capacity of the pile foundation. After the construction of the pile foundation reinforcement cage is completed, steel stress and strain sensors and displacement sensors are installed on the upper and lower loading surfaces of the test pile load box and the pile end and...

Technical field:

[0001] The invention relates to a large-diameter pile foundation self-balancing detection method based on load compensation, which belongs to the technical field of construction engineering detection and evaluation. Background technique:

[0002] The self-balanced pile test method is to connect a special loading device-a load box with a steel cage, and embed it in the designated position of the pile (ie, the balance point), and lead the high-pressure tubing and displacement rod of the load box to the ground together. The high-pressure oil pipe is loaded with oil, and the force is transmitted to the pile body through the thick steel plate. This method requires the friction of the upper pile to be balanced with the friction and end resistance of the lower pile—self-balance to maintain the load. According to the upward and downward Q-S curve, the pile bearing capacity, pile foundation settlement, pile elastic compression and soil plastic deformation are judged. [0...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with the embodiments and drawings.

[0025] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, the specific steps of the self-balancing detection method of a large diameter pile foundation based on load compensation of the present invention are as follows:

[0026] (1) Collection of geological survey data at the location of test piles for self-balance testing, said geological survey data including soil layer information and soil parameters, determine the contribution ratio of the test pile end bearing capacity and pile side resistance, and determine the initial test pile The main factors affecting the environment and the bearing capacity of the pile foundation. After the construction of the pile foundation reinforcement cage is completed, steel stress and strain sensors and displacement sensors are installed on the upper and lower loading surfaces of the test pile load box and the pile end and...

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