超长大直径钻孔桩钢筋笼施工质量控制研究

发布时间：2018-05-23 22:34

本文选题：超长大直径钻孔灌注桩 + 数值模拟　；参考：《铁道工程学报》2017年04期

【摘要】：研究目的:为解决目前超长大直径钻孔灌注桩钢筋笼在制作、吊装、安放过程中的变形及安放精度等问题,本文利用桥梁专业有限元软件Midas/civil对超长大直径钻孔灌注桩钢筋笼进行建模分析,模拟钢筋笼在制作过程中各个工序的受力状态以及变形情况,对钢筋笼的制作与安放质量进行控制。研究结论:(1)钢筋笼采用鐖28的HRB335级钢筋作为主筋,I12.6为箍筋,吊运时吊点离端部4 m,下放采用16根鐖32 mm的主筋为吊筋,分4组吊装在工字钢的两两交汇点,能较好地控制制作与吊装过程的应力与应变;(2)钢筋笼加工采用长线法,每4 m沿圆周均匀布置4个保护层钢筋,上下组保护层水平方向错开200 cm,可以保证桩身混凝土保护层厚度,吊装时利用170 t龙门吊和50 t履带吊同时起吊;(3)保持钢筋笼主筋对接加工与安装的统一性和从材料及施工过程控制声测管的质量,可以有效地避免安全事故,可为以后在滨海地带进行超长大直径钻孔灌注桩的施工提供一定的参考。
[Abstract]:The purpose of this paper is to solve the problems of deformation and precision in the process of making, hoisting, placing, and so on, in order to solve the problems of superlong and large-diameter bored cast-in-place pile reinforcement cage. In this paper, the bridge professional finite element software Midas/civil is used to model and analyze the reinforcement cage of super-long and large-diameter bored cast-in-place pile. The quality of making and placing steel cage is controlled. Conclusion 1) in the steel cage, the HRB335 grade reinforcing bar of Yi-28 is used as the stirrups, the lifting point is 4m from the end of hoisting, and the 16 main tendons of 32 mm are used as hoisting bars, which are hoisted in four groups at the intersection of I-steel. The stress and strain of fabrication and hoisting process can be well controlled. The long line method is used in the processing of steel cage. Four protective layer steel bars are arranged evenly every 4 m along the circumference. The horizontal direction of the upper and lower protective layers is 200 cm staggered, which can ensure the thickness of the concrete cover of the pile body. During hoisting, 170 t gantry crane and 50 t crawler crane are used to hoist and hoist 3) to keep the unity of the connection processing and installation of the main reinforcement in the steel cage and to control the quality of the acoustic tube from the material and construction process, which can effectively avoid the safety accident. It can provide some reference for the construction of long and large diameter bored pile in coastal zone.
【作者单位】：上海铁路局;
【分类号】：U445.551

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