Detection method for static load of pile foundation

Abstract

The invention discloses a detection method for the static load of a pile foundation, which comprises the following steps of: 1, installation: pre-embedding more than one anti-pulling draw bar at the top of a pile foundation to be detected and connecting the anti-pulling draw bars with the pile foundation to be detected into a whole, and sticking a carbon fiber layer on the outer wall of the pile foundation to be detected, wherein the height for sticking the carbon fiber layer on the pile foundation to be detected is greater than or equal to the length of the anti-pulling draw bar embedded in the pile foundation to be detected; 2, connection: connecting the top of the anti-pulling draw bar with a detection component through a draw bar sleeve; and 3, detection: measuring and recording the original elevation of the pile foundation to be detected, and applying force to the anti-pulling draw bar through the detection component; recording the elevation change condition of the pile foundation to be detected each time one-level load is added according to the force loading order; and after the force is completely loaded, obtaining the static load condition of the pile foundation according to the obtained data. The detection method has advantages of simple principle, easy operation, high safety, high detection precision, wide application range, high detection efficiency, time saving and economy.

Description

technical field [0001] The invention mainly relates to the fields of buildings and foundations, in particular to the detection of static loads of pile foundations. Background technique [0002] With the continuous development of the construction industry, there are more and more projects using pile foundations. However, with the widespread use of pile foundations, major engineering quality accidents caused by foundation, pile body quality and other reasons occur from time to time. In order to ensure the safety of engineering structures and the safety of life and property of the country and the people, pile foundation detection is becoming more and more important, especially the static load compression and pullout detection of medium and small diameter cast-in-place piles and tubular piles that are widely used Technology is even more important. [0003] The traditional static load testing methods for vertical compression and pullout of pile foundations include: surcharge me...

AI Technical Summary

Problems solved by technology

[0004] 1. The disadvantages and deficiencies of the stacking method are: the required static load counterweight is heavy, the counterweight platform and bracket are large and cumbersome, and the workload of transportation, installation and dismantling is huge, the labor intensity of the testing personnel is high, the testing time is long, and the testing cost High, and often limited by the natural conditions of the site and cannot be detected

[0005] 2. The disadvantage of the ordinary anchor pile method is that two to four anchor piles must be dug around the project piles to be inspected, which greatly increases the cost of engineering inspection

[0006] 3. The disadvantage of the deep well in-situ detection method is that it can only detect the bearing capacity of the foundation, and then conduct theoretical calculations based on the pile diameter, pile concrete strength and pile body quality, and cannot visually detect the vertical compressive bearing capacity of the pile. Bored piles, rotary excavation piles, vibrating cast-in-situ piles, Luoyang shovel piles, pipe piles and prestressed pipe piles that cannot be tested in situ in deep wells are tested, let alone the pullout test of piles

[0007] 4. Disadvantages of self-anchoring method and self-balancing method: not suitable for vibrating cast-in-situ piles, hammered cast-in-situ piles, drilled piles, rotary excavated piles, Luoyang shovel piles, prefabricated pipe piles, and prestressed pipe piles

[0008] 5. The disadvantage of the hoop method is that it can only be used for the pullout detection of pipe piles, and a positive pressure is applied on the outside of the pipe pile to cause friction between the hoop and the pile wall (that is, the pullout force F). Compression equipment is difficult to process, and at the same time, it is easy to damage the pile head due to excessive local pressure. The detection safety and reliability are low, and there is no promotion value

[0009] All of the above pile foundation detection methods are inconvenient for the pullout test of piles, especially for the compression and pullout static load tests of tubular piles

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