既有墩台加宽植筋设计与施工研究

Research On Design and Construction of Widening and Planting Reinforcement of Existing Pier and Abutment

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摘要为明确墩台加宽工程背景下植筋设计与施工工艺,并考察植筋锚固长度对植筋-基材界面黏结性能影响规律,以新建连云港至镇江铁路淮安地区预留宁淮铁路引入同步实施工程—宁盐上下行联络线既有承台墩身帮宽专项为工程背景,采用植筋-基材拉拔试验,开展了24块以锚固长度为参数下的植筋-基材界面正拉试验。试验结果表明:植筋-基材界面存在有效黏结长度,试验条件下,有效黏结长度介于10-15cm;界面黏结强度并不随着锚固长度增加而增长,有效黏结长度内呈正向增长趋势,当锚固长度超过有效黏结长度,界面黏结应力不变,过长注浆孔道导致基材受损,不利于加固工程安全。 In order to clarify the design and construction process of planting reinforcement under the background of pier and abutment widening project,and investigate the influence of the anchorage length of planting reinforcement on the bonding performance of planting reinforcement substrate interface,taking the newly-built Lianyungang Zhenjiang railway Huai’an area reserved for the introduction of Ning Huai’an railway into the synchronous implementation project——the special project of widening the pier body of the existing pile cap of Ning Yan upstream and downstream connecting line as the engineering background,the drawing test of planting reinforcement substrate is adopted,24 normal tensile tests of the interface between embedded reinforcement and substrate with the anchorage length as the parameter were carried out.The test results show that there is an effective bonding length at the interface between planted reinforcement and substrate.Under the test conditions,the effective bonding length is between 10-15cm;The interfacial bonding strength does not increase with the increase of the anchorage length,but shows a positive growth trend within the effective bonding length.When the anchorage length exceeds the effective bonding length,the interfacial bonding stress remains unchanged,and the long grouting duct leads to the damage of the substrate,which is not conducive to the safety of the reinforcement project.

作者宁海明王悦石江冰关喜彬陶琦 Ning Haiming;Wang Yueshi;Jiang Bing;Guan Xibin;Tao Qi

机构地区中铁十九局集团第六工程有限公司淮阴工学院交通工程学院江苏省交通运输与保障重点实验室

出处《辽宁省交通高等专科学校学报》 2022年第2期9-13,共5页 Journal of Liaoning Provincial College of Communications

基金中铁十九局集团公司科技研究开发计划(CR1906-KJHT-LZXMB-2021001)。

关键词有效黏结长度锚固混凝土基材拉拔试验 effective bond length anchorage concrete base material pull-out test

分类号 U445.72 [建筑科学—桥梁与隧道工程]

作者简介宁海明(1994—),男,内蒙古包头人,助理工程师。研究方向:土木工程、铁路桥梁和路基工程等。