| Radiate-well is a type of special water well, it be constitute with a big reinforced concrete perpendicular-well and the radiates tube in the perpendicular well, the level-well be contained by any high top toward level direction water layer, because level tube report radiate distribute, therefore it is called for the radiate-well.At generally sexually take the water or dewatering in the engineering, it is applied to mainly is the normal big caliber well, but when the construction underground the line and subway tunnel, usually need to stride over the highway, prosperous downtown, cluster the current building of etc. In this type of engineering, radiate-well to dewater have the advantage of cover the area small, geologic strata orientation scope wide, the water have great capacity and its single well control the big scope, therefore it is now and already get largely application in much large foundation construction.In the Beijing No.5th subway dewater engineering to apply the method of radiate-well for the first time. It vailably resolved the problem of building move,influence of transportation, pollution of the environment etc. in dewater engineering in the prosperous district of city. but to use of the radiate-well also exsit some problems now:1,how to calculate the water current of the level-well, and how to make sure the radiates tube's number in each perpendicular well 。2,The perpendicular-well, level radiates tube under differently water layer the term of construction craft, how to handle the widespread technique problem which in the construction;3,how to control the sink and decline, the soil shake up which caused by radiate-well construction.In these aspects, the current design and construction without the related theories or experience to be used as mimicry, and the domestic or abroad research in this aspect also compare blank. This article make out the summary with study to these problems according to the actual construction of subway engineering.Radiate-well's theories and calculation still be a very complicated problem now, have no the calculation formula of the common suitable for use in different region, different geology term, now the many formula all look like of, demand the actual data take into verification.This article draw lessons from the former worker's research result, and join together the Beijing No.5th Subway East Four Stand the under construction and actual circumstance of engineering, and make use of the inquisition data and empirical formula and big well method to certain water measure, also objectively analyzed the radiate-well's special of application in subway construction to decline the underground water, primarily is: 1,the purpose that this engineering adopt the radiate-well is that it replace a certain number of the big caliber well's function;2,in the subway dewater engineering, the groundwater scope that radiate-well to be requested to control is already settled, namely the length that level radiates tube is basic certain;Therefore the way of calculate the radiation well is: investigate this district the water current deal of the big caliber well, and radiate-well to control the district to should arrange the number of big well in the same term,estimate the designing water of the radiate-well, certain the level radiates tube's number, direction, diameter, length etc..The construction of radiate-well includes two aspects: the perpendicular-well and the level radiates well. The construction of perpendicular-well primarily use the sink well method, hang the wall method and the spray method etc. under construction synthesized to consider the advantage or weakness of the every kind of craft method. We decision to use the sink well method.In the process of sank the well appeared this kind of craft most typical and familiar problem: the well tube bias is take placed and not descend sink.Physically in the construction adoption increase the heavy to force the well tube to down sink, use dig part of the bottom, wood to mat solidly, increase pressure on... |
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