新型活络端头钢支撑及深基坑支护效果现场试验验证
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摘要
研发一种新型活络钢支撑技术,通过在活络端头两侧各设置1个锁紧螺栓,实现减小支撑结构偏转力矩及保证支撑底板与围岩紧密接触。通过苏州某地铁深基坑支护工程的实际应用,并与传统承插式楔形块钢支撑进行试验比较,验证该新型钢支撑活络端头的保载性能及基坑支护效果,可在基坑开挖过程中提供更高轴力,使基坑坑壁变形得到较好控制。变形监测也表明,新支撑段地表沉降变形量明显小于传统支撑段。因此,新型活络钢支撑的支撑轴力保载率高,基坑变形控制效果好,能确保基坑工程自身稳定及周边建(构)筑物的安全。
A new type of flexible winding steel support technology is developed. By installing a locking bolt on both sides of the end of the flexible winding,the deflection moment of the support structure is reduced and the close contact between the supporting floor and the surrounding rock is ensured. Through the practical application of a deep foundation excavation supporting project of a subway in Suzhou,and comparing with the traditional socket wedge-shaped steel support,the load-retaining performance of the new type of steel support flexible end and the effect of foundation excavation support are verified,which can provide higher axial force in the process of foundation excavation and make the deformation of foundation excavation wall better controlled. Deformation monitoring also shows that the surface settlement deformation of the new support section is significantly smaller than that of the traditional support section.Therefore,the new type of flexible-collar steel support has a high bearing rate of supporting axial force,good deformation control effect of foundation excavation,and can maintain the stability of foundation excavation engineering itself and the safety of surrounding buildings.
A new type of flexible winding steel support technology is developed. By installing a locking bolt on both sides of the end of the flexible winding,the deflection moment of the support structure is reduced and the close contact between the supporting floor and the surrounding rock is ensured. Through the practical application of a deep foundation excavation supporting project of a subway in Suzhou,and comparing with the traditional socket wedge-shaped steel support,the load-retaining performance of the new type of steel support flexible end and the effect of foundation excavation support are verified,which can provide higher axial force in the process of foundation excavation and make the deformation of foundation excavation wall better controlled. Deformation monitoring also shows that the surface settlement deformation of the new support section is significantly smaller than that of the traditional support section.Therefore,the new type of flexible-collar steel support has a high bearing rate of supporting axial force,good deformation control effect of foundation excavation,and can maintain the stability of foundation excavation engineering itself and the safety of surrounding buildings.
引文
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[20]卞国强.基于基坑变形控制的伺服钢支撑计算分析[J].隧道与轨道交通,2018(3):27-30,56.
[2]刘文进.深基坑工程动态变形控制分析[J].土工基础,2018,32(6):599-601.
[3]姜志刚.大跨度地铁车站深基坑中的钢支撑施工技术[J].建筑施工,2012,34(2):91-94.
[4]黄彪,李明广,侯永茂,等.轴力自补偿支撑对支护结构受力变形影响研究[J].岩土力学,2018,39(S2):359-365.
[5]刘杰.预应力鱼腹式钢支撑在深基坑支护方案优化设计中的应用[J].建筑结构,2018,48(9):103-107,54.
[6]黄勇,汤烨,周建中,等.久置临轨超深基坑后加分隔墙施工技术研究与应用[J].施工技术,2019,48(1):38-42.
[7]张浩,吴志鸿,张峰,等.深基坑混凝土支撑轴力精确性分析[J].地下空间与工程学报,2018,14(S1):342-348.
[8]丁昕,张伟玉,夏尧.钢支撑-混凝土框架体系在结构中的应用[J].建筑结构,2018,48(21):56-59.
[9]李书银,李世良.地铁深基坑钢支撑预加轴力消散原因分析[J].铁道勘察,2018,44(5):39-42.
[10]熊栋栋,杨钊,廖正根.地铁深基坑钢支撑预加轴力分析[J].地下空间与工程学报,2018,14(4):1049-1055.
[11]刘毅,张勇,贺祖浩,等.伺服钢支撑在邻近建筑物车站深基坑中的应用[J].施工技术,2018,47(23):72-75.
[12]李兵,孙小飞,孙丽.地铁深基坑支护结构钢支撑力学参数研究[J].济南大学学报(自然科学版),2018,32(4):261-267.
[13]王斌.钢支撑预加轴力对基坑变形的影响[J].铁道建筑,2017,57(12):89-91,101.
[14]龚金弟.单侧超载基坑的钢支撑自动伺服系统应用实践[J].建筑施工,2018,40(6):837-839.
[15]张赞.钢支撑在地连墙围护结构中的耦合支护机理研究[D].太原:太原理工大学,2018.
[16]李孚昊,徐佳伟.支撑轴力伺服系统在地铁深基坑工程中的应用[J].路基工程,2018(3):157-161.
[17]黄亮亮.钢支撑自动伺服系统对周边环境的影响实测与分析[J].建筑施工,2015,37(8):1014-1016.
[18]吉茂杰.钢支撑伺服系统在轨道交通工程中的应用[J].建筑施工,2018,40(4):584-587.
[19]尤旭东.柔性十字接头和自动伺服钢支撑在地铁站基坑施工中的应用[J].建筑施工,2017,39(3):289-290.
[20]卞国强.基于基坑变形控制的伺服钢支撑计算分析[J].隧道与轨道交通,2018(3):27-30,56.