Application Research Of Nail Shape Bidirectional Mixing Cement-soil Pile Applied In The Railway Subgrade

Nail form pile treatment method of soft soil foundation is an emergingtechnology, in view of the traditional soil-cement mixing pile pile mechanical powertransmission system, improve the blade, drill pipe, drill bit, etc.Coaxial two-way pipe, the pile body is nail traits, is a combination ofsoil-cement mixing piles and bidirectional mixing pile the advantages of two kinds ofpile type. Nail form pile composite foundation has a small foundation settlement,construction speed, quality, easy to control, high economic benefit etc, has beenwidely used in civil engineering, highway engineering, With the rapid developmentof railway construction enterprise in our country, this article first to the effectivemethod of soft soil foundation treatment of soft soil foundation treatment is applied tothe railway. Composite foundation under the railway roadbed and road embankmentcomposite foundation under the flexible foundation composite foundation under rigidfoundation, building engineering work character difference, and this method is firstapplied in railway soft ground treatment, so the theoretical analysis and designmethod, construction technique and economic benefit of study is not very mature.In this paper, combining with engineering example, the nail form pile with bohai rim region soft soil foundation are analyzed in a certain research, theoreticalanalysis and design method of hope in the future, and to provide the reference ofengineering practice, this paper, the work done by basically has the following severalaspects:First, this paper expounds the screw pile composite foundation structurecharacteristics, development situation and the status quo of the research. The nailshape pile reinforcement mechanism, mechanism of load transfer, the applicablescope and damage form.Second, reference many building codes, summarizes the design method of thepile, including expanding the nail form pile head height, pile diameter, pile up andform as well as the design and calculation. In this paper, we study nail design calculation of the pile is mainly to calculate the settlement of single pile bearingcapacity calculation and composite foundation, and recommend the rapid andefficient nailing pile composite foundation settlement calculation method.Again, in detail elaborated the nail form pile construction process, qualitycontrol methods, analysis according to the construction problems in the field ofengineering practice, prevention measures are put forward, analysis the superiority ofthe construction technology of composite foundation.Finally, combining with the â…£ of han huang railway located at the Cang ZhouHe Bei province, studying the characteristics of nail form pile composite foundation.According to the engineering geological profile link bo hai sea area, the nail shapepile composite foundation under embankment load settlement calculation; Bycomparing the methods, respectively analysis nail form pile construction andengineering economy efficiency.Han huang railway nail form pile reinforcement railway roadbed practicalengineering significance and results have been achieved, speed up the application ofnew technology promotion.