论文部分内容阅读
钻孔灌注桩结构的设计仍按一般桩基的计算原理进行。桩的最小中心距一般采用按桩直径的二倍半。在桩的布置合理和钻进不困难的情况下,可适当增加桩长或桩径从而减少桩数,以减少承台和墩台身结构的工程量。桩的直径根据桩基结构的力学计算和地基土的强度结合桩长要求,予以确定。目前已采用的直径为50～125厘米。最大桩长已达25米。水下灌注混凝土的标号根据桩基结构计算决定,一般采用150～200号。坍落度为18～20厘米。根据内力计算确定的桩内主筋直径不宜小于16毫
The design of bored pile structure is still based on the calculation principle of ordinary pile foundation. The minimum center distance of the pile is generally doubled by the diameter of the pile. In the reasonable layout of the pile and drilling is not difficult circumstances, may be appropriate to increase the pile length or pile diameter in order to reduce the number of piles, in order to reduce the cap and abutment body structure of the project. The diameter of the pile is determined according to the mechanical calculation of the pile foundation structure and the strength of the foundation soil combined with the length of the pile. Has adopted the diameter of 50 to 125 cm. The maximum pile length has reached 25 meters. Underwater concrete pouring marked according to the calculation of pile structure, the general use of 150 to 200. Slump is 18 to 20 cm. Calculated according to the calculation of the internal reinforcement of the main reinforcement should not be less than 16 millimeters diameter