Quality,control,of,bored,caisson,pile|bored
时间：2019-04-17 03:38:47 来源：雅意学习网 本文已影响 人 
Abstract:In recent years, with the emergence and application of new process, technologies and new materials, The bored pile, which can solve bearing capacity of specific foundation, is widely used in various types of civil engineering, with many advantages , such as a good antiseismic performance, large carrying capacity, low construction noise, etc. At present, the bored pile foundation in China gradually replaces the original construction methods. Relative to the original construction methods, new techniques, which can save materials and shorten the construction period, will not only reduce the weight of the pier and reduced the project cost, but also pleasing in appearance. Compared with the basis of this type of foundation abroad, it needs fewer and simple construction equipments, the equipments are easy to operate and easy to grasp for the workers. It also can reduce the bearing capacity of foundation requirements, and you can drill into deeper soil layers, etc., so it is rapidly adopted and promoted.
Key words: bored caisson pile ,Quality , Control
Chinese classification number: O213.1 literature identification code: A article Numbers:
First, control of the materialThe sand, stone, cement, steel and other materials on the spot should be sent to the laboratory to detect at any time , the one which is not in conformity with the requirements must be clear out of the spot, may not be used.The gradation of Underwater concrete must be strictly enforced the mixing proportion issued by the laboratory
Second, Quality control of bored pile and Impact Pore-forming Comprisol Pile
1. The embedment of steel casing and general requirements
(1) The inner diameter of the casing in general is about 200mm-400mm "slonger than the pile "s diameter, and it is generally made from steel. It is required that there is no prominence within the connection of the casing, which should be stretch-proof , pressure-proof, and watertight.
The embedment of steel casing : the method of digging pit to embed can be taken.the bottom of the casing and its surrounding should be tamped hierarchically by cohesive soil , the center vertical line should be coincident with the pile center point and located by the method of cross positioning. In most cases, Except as otherwise provided by design, 50m"s deviation is allowed, The vertical gradient should be not more than l%. Casing Depth should be determined according to the design requirements or the hydrogeological conditions of the pile, The depth is 2m-4m in general, In exceptional circumstances ,the depth should be increased to ensure that the drilling and spouting concrete smoothly.
2 The modulation and operating requirements of the mud.
In addition to the geological conditions in the drilling process, mud is an important factor to ensure that there is no hole collapse.
With appropriate ratio,the drilled mud is generally composed of water, cohesive soil (or bentonite) and additives. The mud performance indicators of the drilling pile can refer to the following table:
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