浇注桩基混凝土及声测管埋置的几个技能题目(国外英文资料).docVIP

浇注桩基混凝土及声测管埋置的几个技术问题(国外英文资料) Several technical problems of embedding concrete and acoustic tube 2, 2010-2-25 14:24 (large middle) 【 print 】 As the saying goes, the construction of a bridge is the first step in the construction of a bridge. Therefore, the quality of the pile foundation will directly affect the overall quality of the bridge. But pile foundation pile hole by buried deep under the earths surface, plus in most of the underground water level is higher, so the pouring concrete pile quality has been more difficult to control, is now a few views on the issue: 1. The pile foundation concrete strength grade and protecting should be adopted in accordance with pile foundation concrete strength grade, and breast wall must be more than 30 cm above the ground, in addition to carefully check whether leakage, water seepage and protecting; 2. The concrete of the pile foundation is mainly based on the so-called dry pile (artificial dig-hole pile) or underwater pile drilled pile concrete design, general underwater pile pouring concrete slump is dry pile pouring of concrete slump, but no matter what kind of pile concrete pouring, the working performance should meet the specific requirements of the construction process, such as concrete slump, setting time, slump loss, etc., which is particularly important indicator is the water retention and cohesive properties of concrete must be good; Check the bottom of the concrete and remove the slag and water. Usually sediment that clears easily, but due to the high underground water level, water cleaning, in view of this there are generally two kinds of methods can be adopted: one is water yield of groundwater is lesser, in the first one before concrete pouring, should use felt, sponges and other items will be hole bottom water are cleared and once cleared immediately to carry on the concrete pouring, and the first one concrete cement dosage can be appropriately increased, pouring height should be strictly controlled, to ensure t