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Correct method of pine pile construction
- 2018-12-19-

Because the country does notpine wood pileRelevant technical specifications, therefore forpine wood pileThe acceptance specifications for the bearing capacity of composite foundations must refer to GB50202-2002 Construction Quality Acceptance Specifications for Building Foundations, which is greater than the mandatory provisions on the acceptance of composite foundation foundations in Article 4.1.5: The number of inspections shall be no less than 3 points per unit project. According to the on-site In response to the situation, we invited qualified testing agencies to randomly select and inspect the site. A total of 4 locations were selected. After on-site static pressure testing, the test results all met the specifications when the applied load was higher than 2 times the design load. In addition, , conduct geotechnical tests to detect the void ratio of the soil and rock between the piles, and further verifypine wood pileThe stability of the composite foundation can fully meet the design requirements.

According to different pile driving methods, it can be divided into manual drivingpine wood pileAnd mechanical pile driving. Commonly used pile driving machines include hand winches and diesel pile drivers. Hydraulic excavators are also often used to drive piles. When using a hydraulic excavator to drive piles, two people are required to hold the piles in place and turn the bucket upside down to withhold it. Wooden piles, press the wooden piles into the foundation to a certain depth to stabilize themselves, then let the stakeholder walk away, and the excavator willpine wood pilePress down, usually one pile can be driven every 3-5 minutes, and the work efficiency is high. In order to achieve a good squeezing effect and improve the bearing capacity of the foundation, the piles must be driven from 4 weeks around the base to the inner ring. The piles are arranged in a plum blossom shape. Well, the distance between piles should not be less than 3 times the pile diameter.

After piling is completed, the pile heads should be sawn flat according to the designed elevation so that the pile tops of each pile are basically kept at the same level. The silt squeezed out during pile driving should be excavated, and a 20-30cm thick graded sand and gravel mattress should be laid on top of the piles. Compact it, and then pour the bottom slab concrete to ensure that the foundation transmits part of the load to the soil between the piles through the cushion layer, and adjusts the sharing effect between piles and soil. Setting up a cushion layer under the foundation can reduce the pile-soil stress ratio. By giving full play to the role of the soil between the piles, you can increase the value and reduce the stress concentration on the bottom surface of the foundation. By changing the thickness of the mattress, you can adjust the sharing of the vertical load of the piles. The thinner the mattress, the greater the percentage of the load borne by the piles in the total load. high, and vice versa. If there is no mattress layer, the soil between the piles cannot play its role.

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