2009, Volume 11, Issue 7
Strategic Study of CAE >> 2009, Volume 11, Issue 7
The application of DX rotary and squeezed pile on railway bridge engineering
1. Beijjing Jiaotong University, Beijing 100044, China;
2. China Railway Tunnel Group, Luoyang, Henan 471001, China
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Abstract
Squeezed pile with plates (being DX pile) is a new type pile that has been developed in recent years. Based on common cast-in-place pile, it adequately avails itself of the bearing capacity of each soil hard layer. According to the difference of design bearing capacity and engineering geological condition, it consists of plates by the squeezing equipment of hydraulic pressure in the different parts of DX pile. DX pile is a sort of change-section pile and is priority to shaft resistance between friction pile and shaft pile. Making use of the tip resistance of breaches and plates and shaft resistance around the branches is in order to add the shaft resistance and tip resistance. In situ test has shown that it can sharply improve the bearing capacity of pile. DX squeezed pile cannot only be applied in clay, silt, sand, weathering rock mass and residual deposits of soil, but also can be used in interactive layers of gravel,clay,and sand. The diameter of DX squeezed pile can be 400~2 000 mm,and the length of it can be more than 60 m. It is a new type of pile which has a bright future for application. Now it has got the extensive application in high building, bridge,civil engineering and high structure. Due to it's good bearing capacity and low settlements,it can an be applied and promoted to different foundation engineering of railway bridge engineering,and would get a good prospect of application and extension.
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