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首页> 外文期刊>Tunnelling and underground space technology >Field performance of concrete pipes during jacking in cemented sandy silt
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Field performance of concrete pipes during jacking in cemented sandy silt

机译：水泥砂质粉砂顶升过程中混凝土管的现场性能

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摘要

Although many field investigations into pipe-jacking installation have been reported within the literature, there are few reports on the rebar stress in jacking pipes. This paper presents the field performance of concrete pipes during the jacking carried out under the Guan River in Jiangsu, China. Rebar stresses at two wings (the left and right side), the top crest, and the base in the longitudinal and circumferential directions for four different pipes were monitored. The maximum rebar stresses during the jacking were 37.1 MPa in the longitudinal direction and 36.6 MPa in the circumferential direction. However, the maximum rebar stresses after construction were only 18.5 MPa in the longitudinal direction.and 20.3 MPa in the circumferential direction. A normalized jacking force "alpha" is proposed to evaluate the additional rebar stress in jacking pipes. The range of at is from 0.04 to 0.25. The relationship between the rebar stress and the construction procedure is presented and discussed. An excessive jacking force, an alignment deviation or an increased penetration rate would generate a large incremental rebar stress. (C) 2015 Elsevier Ltd. All rights reserved.
机译：尽管文献中已经报道了许多关于顶管安装的现场调查，但是关于顶管中的钢筋应力的报道却很少。本文介绍了在江苏灌河下顶进过程中混凝土管的现场性能。监测了四个不同管道在纵向和周向两个翼部（左侧和右侧），顶部波峰和底部的钢筋应力。顶进过程中的最大钢筋应力在纵向为37.1 MPa，在周向为36.6 MPa。但是，施工后的最大钢筋应力在纵向上仅为18.5 MPa，在圆周方向上仅为20.3 MPa。建议使用归一化的顶升力“ alpha”来评估顶升管中的附加钢筋应力。 at的范围是0.04至0.25。介绍并讨论了钢筋应力与施工过程之间的关系。过度的顶压力，对准偏差或增加的穿透率会产生较大的钢筋应力。 （C）2015 Elsevier Ltd.保留所有权利。

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