The Application Of Research On T-shaped Bidirectional Soil-cement Deep Mixing Pile In Subgrade Engineering

T-shaped bidirectional soil-cement deep mixing pile is an improvement of cement mixing method, which uses a concentric biaxial drill pipe, drill pipe rotating in opposite directions, both inside and outside at the same time, positive and reverse rotation, and adopts two sets of automatic telescopic blade, can be at any depth underground expansion into two different radius, the pile top section enlargement, form the nail shape of cement-soil mixing pile.Because our country nail form two-way mixing cement-soil pile is introduced later, at this stage of its application in highway subgrade engineering theory and experimental research is just at the start stage, the development of nail shape on the theory of two-way mixing cement-soil pile, the construction technique and economic benefit, etc. There are many questions.Based on the Daguang highway Hengshui section of engineering examples, due to the location of the project geology complexity, for its part of the soft soil area chooses the nail shape two-way mixing cement-soil pile for foundation reinforcement. Through to the nail form two-way mixing cement-soil pile detailed calculate and determine the pile length, pile diameter and pile spacing and other parameters. Comparing calculation software of the calculation results and the reason is found that the error in the acceptable range. And then expounds the nail shape of bi-directional cement-soil mixing pile construction process and the matters needing attention in the process of construction, the problems existing in the construction and the solutions. Finally, the big wide high-speed hengshui section of the nail form of two-way mixing cement-soil pile quality and its inspection and made a lot of advantage such as Stir well, on-site mixing, small disturbance, reasonable stress, reduce the settlement, the equipment is simple and economical.With mixer equipment innovation to further improve the efficiency of development and construction, and construction monitoring automation devices widely used, nail shape of bi-directional cement-soil mixing pile technology will be more perfect, will be more extensive adaptability, two-way mixing cement-soil pile nail form also will increasingly reflect its obvious advantages, will be adopted by the wider engineering and technical personnel.