刘家峡大桥主缆空隙率及索夹抗滑移试验研究

发布时间：2018-06-17 20:35

本文选题：悬索桥 + 主缆　；参考：《世界桥梁》2014年05期

【摘要】：刘家峡大桥主桥为单跨536 m的桁式加劲梁双索面悬索桥,单根主缆采用44股127根?5.2 mm镀锌高强钢丝,设计空隙率在索夹处取18%,在索夹外取20%,主缆索夹由2个半圆形铸钢结构通过高强度螺栓上下对接紧箍在主缆上,接缝处嵌填橡胶防水条。索夹的抗滑移性能是影响悬索桥主缆正常使用的一个主要因素。为了解该桥索夹抗滑移性能是否满足设计要求,在大桥主缆架设完紧缆后,在主缆上同时安装制动索夹、试验索夹以及推力千斤顶,利用千斤顶模拟索夹下滑力,对计算确定的最不利索夹进行顶推试验,测试索夹抗滑移摩阻系数和索夹内、外部空隙率。试验结果表明:实测索夹抗滑移摩阻系数为0.213,大于设计要求的0.15,满足设计要求;实测索夹内、外部空隙率分别为17.6%、18.4%,满足设计要求。
[Abstract]:The main bridge of Liujiaxia Bridge is a single span 536m truss stiffened beam with double cable surface suspension bridge. The single main cable adopts 44 wires, 127 strands, 5.2 mm galvanized high strength steel wire, The design void ratio is 18 at the cable clip and 20 outside the cable clip. The main cable clip is made up and down of two semicircle cast steel structures, which are fastened to the main cable by high strength bolts, and rubber waterproofing strips are embedded in the joint. The slippage resistance of cable clamp is one of the main factors that affect the normal use of the main cable of suspension bridge. In order to understand whether the anti-slip performance of the cable clamp of the bridge meets the design requirements, after the main cable of the bridge is set up, the brake cable clamp, the test cable clip and the thrust Jack are installed simultaneously on the main cable of the bridge, and the sliding force of the cable clip is simulated by using the Jack. The sliding friction coefficient of the cable clip and the internal and external void ratio of the cable clip were tested by the push-push test. The experimental results show that the friction coefficient of the cable clip is 0.213, which is larger than the design requirement 0.15, and the external void ratio of the cable clamp is 17.618. 4, which meets the design requirements.
【作者单位】：兰州交通大学甘肃省道路桥梁与地下工程重点实验室;甘肃省交通科学研究院有限公司;
【分类号】：U448.25;U446.1

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