| The building primarily is constitute with groundsill ,foundation and third parts construction. Although its each function is different, research method is dissimilitude, however for a building to say ,in the weight next, these three parts contact each other and make roughly the whole mutually .The groundsill and foundation is the root of the building belonging to the underground concealment engineering also. Its investigates, design and the construction quantity relate to the peace or chaos of the building directly. In addition, the foundation expenses builds building gross the comparison of the price, seeing its complicated degree with the reasonable that design, construction or not, can change in several of percents to several ten of percents. Therefore, groundsill and foundations are what easy to sees in the importance in the construction engineering.Groundsill is all geologic strata that acceptance building weight carry, the foundation is lower part construction. That carry weight to the ground.Multitude and high buildings have lots of kinds of foundation type, they are independent foundation, strip foundation, cross foundation, flat foundation, form foundation and pile foundation etc. Foundation type choice is involve in upper construction type ,weight dig or little, using require. groundsill solid bury condition and physics strength properties, underground water level and construction condition, build date, construction cost etc. factor. At reasonable choice ground foundation project, we should compare technique project with the economic project necessarily, synthesize consideration certain it.In concrete engineering, the choice groundsill foundation type usually considers the bottom says the some factor:1,the structural layer in upper part counts to and carry with weight the circumstance is an important factor to decide the foundation form. The layer number is the more many, the weight the more big, will beg the basal loading ability the more high, total strong is the more big.2,the different from the choice of the direct influence in construction system foundation form, upper part in form in structural construction in upper part construction sensitive degree that transform is different to groundsill asymmetry, the upper part construction transforms to the asymmetry the more sensitive, should increases possibly more basal and total strong degree. 3,Groupsill term, such as the soil layer of the group ,the strength of each soil layer and transform the kind, underground water level circumstance etc. is to chooses the foundation form basic basis.4,The foundation also should consider in choosing type the engineering measures, the material consumes with build the factor on the price.Multitude high buildings generally because construct ground floor or underground equipment floor so as to take precedence choice the form foundation. The underground space construction of a form foundation formation has the very big space strong degree, and can provide various usages function for the building. A form foundation can obviously exalt foundation stability, lowering the foundation sink to decline the deal.When the foundation upper part is weak but the not that deep place buries solid geologic strata or geologic strata rise and fall bigger, the most proper adoption pile foundation and the bore～form foundation. A pile foundation can control the group sinks and the asymmetry sink dissimilarity can bear the bigger ascending pull out the force the level force etc.While proceeding a pile foundation design, consider primarily below the contents of a few aspects:1,A pile type chooses and a choice for carrying pile holding power bottom layer.2,The pile arranges. Include a pile the center distance a depth of reasonable arranging and stake carrying entering holding dint layer etc. contents.3,The pile calculation of the pile and sink the calculation.4,Pile bear set design calculation.At the last decade, because the pillar weight carries the aggrandizement, and also because of construction...
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