Powder-Jet Pile Constuction Technology And Quality Control

In 1967,Mr.Kjeld Paus,in the BPA Company of Sweden,brought forward a reinforcement method by original soft clay mixed with quicklime shaping lime columns(Lime Columns Method),which marks powder-jet technology coming out.The method has been popular used at home and abroad for nearly twenty years because using this foundation treatment technology needn't vibrate,especially it wound not lead to pollution and serious affection to environment.Powder-jet piles should be widely spread as a method of improve the strength of soft ground through the long time practice,which is applied to treat with the soft ground of railroad,freeway,city planning engineering,civilian industry and architecture and so on.The powder (wet) spurts the pile technology to have the design theory in the development (already pile local guerillas synergy compound ground theory, subsidence and stable computational method and so on) with the construction indictment request as well as the construction machinery monitoring equipment's improvement and so on three aspect questions, undergoes all quarters research to enhance in recent years, already very maturely solved, and includes in GB code standard JTJ017-96 "Reinforcement Earth Pile" the related provision carries on stabilizes with the subsidence computation, carries on executes the working substance to control and to approve.This paper discusses comprehensively about the design of powder-jet pile,construction technology and quality control through studying a lot of engineering materials.The influence powder spurts the pile quality the factor is various [11][12][13], but the objective factor and the subjective factor are two most main aspects: The objective factor is mainly the foundation soil condition which and the nature reinforces: So long as these objective factors we study and the treatment are earnestly may understand and the accurate assurance correctly: The subjective factor has three big main points: The first powder spurts the pile to interpolate the powder body measurement the question. Second duplicate stirs the construction craft to the pile body comprehensive quality influence. Third is to the mechanical device choice, thus creates influence.What but occupies the most important status is the subjective factor. Proved according to the massive project construction practice: The powder (wet) spurts the pile construction quality the key in is takes the effective action"the control pile to be long","the control cement (cement mortar) to gush in the quantity"and"the control agitation number of times"as well as insists"Cheng Zhuangquan the process"the quality monitoring. The powder (wet) spurts the pile is the concealed work, examines afterward can only take the supplementary means that cannot represent the complete quality the reliability. Only then spurts the pile construction in the powder each link guarantee quality to go through a strategic pass, can cause the powder to spurt in the pile whole to achieve the quality to go through a strategic pass. Is also needs the crews to have the high sense of responsibility from start to end, the construction process must standardize, the institution.The author presented the concrete step and request of the method in the construction process.It has achieved very good effect from the application in constructing Ning-Hang freeway.Has constructed looking from our country with in the highway which constructs, the powder spurts the pile processing soft soil ground is one kind effective and the widespread application craft method, compares with other soft base processing method, has the construction to be convenient, the time is short, after the labor, subsides slightly (transport business quality high) and so on remarkable merit. But looking from its design method and the construction quality control, the technical difficulty is quite big, if grasps not well, extremely easy to present the deviation, because and it is the concealed work, easy to leave behind the hidden danger. But, so long as by the science manner, the strict control its design method and the construction quality control, certainly can obtain satisfaction project quality.