Pine piles are generally arranged in a plum blossom shape or square. The distance between piles should not be less than 3 times the pile diameter, generally 500-700 mm. The pine piles are driven into the piles. According to the different pulping methods, they are generally divided into manual piling and mechanical piling. Commonly used pile drivers There are hand windlass, diesel pile driver, and hydraulic excavator is mostly used for piling.

When using a hydraulic excavator to drive piles, two people are required to help the piles into position, turn the bucket upside down to buckle the piles, and press the piles into the foundation to stabilize themselves at a certain depth. The person helping the piles will then walk away. Excavating opportunities By pressing down loose piles, it usually takes 35 minutes to dig out a loose pile, which is highly efficient. In order to achieve a good compaction effect and improve the bearing capacity of the foundation, piles should be driven inward from the periphery of the foundation. After the piles are completed, the piles should be driven according to the designed elevation. The head is sawed flat, the pile is dug and the soil is squeezed. A 2030cm thick gravel cushion is laid on the top of the pile and compacted, and then the cushion foundation concrete is poured. Another requirement for wooden piles is anti-corrosion, and asphalt coating is generally used.

Since there are no technical specifications related to pine piles in China, the acceptance specifications for the bearing capacity of pine pile composite foundations must refer to GB50202-2002 Construction Quality Acceptance Specifications for Building Foundations: the inspection quantity is greater than the mandatory provisions of Composite Foundation Acceptance Clause 4.1.5, and each unit project is not Less than 3 points.

Based on the on-site conditions, we invited qualified testing institutions to randomly select testing sites, and a total of 4 sites were selected. After the on-site static pressure test, when the applied load was greater than 2 times the design load, the test results were in compliance with the specification requirements. In addition, through The geotechnical test tested the void ratio of soil and rock between the piles to further verify that the stability of the pine pile composite foundation fully meets the design requirements.