Construction technology for deep water foundation pile foundation

Abstract

The invention discloses a construction technology for a deep water foundation pile foundation. The construction technology includes the following processes that firstly, a cofferdam is constructed; secondly, a steel protection cylinder is put down; thirdly, bottom sealing construction is conducted on the cofferdam; and fourthly, drilling piles are constructed, wherein the multiple drilling piles are constructed respectively. Construction of the drilling piles includes the steps that 401, lead hole drilling is conducted, wherein multiple lead holes are drilled from top to bottom in hard rock where the currently-constructed drilling piles are located, and the 8-10 lead holes are vertically arranged and include multiple edge holes and one middle hole; 402, the drilling piles are constructed; and 403, the step 401 and the step 402 are repeated multiple times till the construction process of all the drilling piles is completed. By means of the construction technology, due to the fact that the multiple lead holes are drilled from top to bottom in the hard rock where the drilling piles are located, the number of the lead holes and the arrangement positions of all the lead holes are limited so that screen holes can be formed on the hard rock where the drilling piles are located and rock fracture planes can be increased, and the problem that due to the fact that the rock is hard and complete and the drilling construction progress of the drilling piles is affected can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a deep-water foundation pile foundation construction technology. Background technique [0002] With the development of the national economy, my country's railway bridge industry is developing rapidly. my country's bridge design theory, construction technology and equipment are catching up with or approaching the world's advanced level, and the construction of long-span sea-crossing and river-crossing bridges continues to increase. The deep-water foundation with a size of 30.25m×19.75m×5m for the main pier cap is currently the largest deep-water foundation for railway projects on inland waterways. The use of double-wall steel cofferdams for underwater foundation construction has become the main method for large-volume deep-water foundation construction for modern long-span bridges. The construction of double-wall steel cofferdams needs to adapt to special ...

AI Technical Summary

Problems solved by technology

Especially when the pile foundation rock is particularly hard and complete hard rock, the "hole reaming effect" is poor during the drilling process, resulting in particularly serious wear of the hammer head. On average, the hammer head needs to be welded once every 20cm-30cm in footage, and the phenomenon of drill sticking also occurs. More, easy to break and cause the hammer head to be scrapped

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