In recent years, after a lot of engineering practice and trial and error, the DTH hammer has been designed, and the construction method has been provided, which solves the problem that DTH hammer cannot be embedded in rock, and provides a new rapid drilling construction technology-DTH hammer into Pile craft. The following features are fully demonstrated through engineering practice:
(1) DTH hammer are used for soil and rock drilling, without the need to change the drill bit; supplemented by the large axial pressure belt water drilling, the construction speed is fast and the work efficiency is high.
(2) Relying on the "borehole grouting method" technology, there is no need for mud wall protection and removal of sediment at the bottom of the hole, simplifying the process, accelerating the pile formation speed, ensuring the quality of the pile foundation, improving the bearing capacity of a single pile, and reducing costs.
(3) Based on engineering experience, sum up a set of drilling parameters and actual rock-socketing control standards. It can identify and make up for the limitations and errors of the geological survey report to ensure the reliability and accuracy of the pile foundation embedded in the rock.