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隧道建设(中英文) ›› 2013, Vol. 33 ›› Issue (5): 362-367.DOI: 10.3973/j.issn.1672-741X.2013.05.005

• 研究与探索 • 上一篇    下一篇

砂卵石地层下复合锚杆桩对保护桥桩的作用分析

王东清   

  1. (北京城建集团有限责任公司, 北京 100088)
  • 收稿日期:2013-01-21 修回日期:2013-03-14 出版日期:2013-05-20 发布日期:2013-05-16
  • 作者简介:王东清(1974—),男,吉林松原人,1998年毕业于吉林工学院公路工程专业,本科,工程师,现从事地铁、市政工程现场技术工作。

Analysis on Protection Effect of Composite Bolt Piles on  Existing Bridge Piles in Sandy Cobble Ground

WANG Dongqing   

  1. (Beijing Urban Construction Group Co., Ltd., Beijing 100088, China)
  • Received:2013-01-21 Revised:2013-03-14 Online:2013-05-20 Published:2013-05-16

摘要:

北京地铁14号线暗挖隧道下穿某大型桥梁桥区群桩,对桥梁的沉降控制要求非常严格,安全风险很大。砂卵石地层地铁暗挖隧道穿越桥桩时,分别对“采用”和“不采用”复合锚杆桩2种情况,对整个实施过程中的监测数据进行对比和分析,得出在砂卵石地层下,复合锚杆桩虽然能对桥桩起保护作用,但施工本身也会导致桥梁沉降,因此,应根据砂卵石地层情况决定是否采用复合锚杆桩,以免造成不必要的浪费。

关键词: 暗挖隧道, 砂卵石地层, 复合锚杆桩, 桥桩, 沉降

Abstract:

A mined tunnel of Line 14 of Beijing Metro runs underneath the group piles of a large scale bridge. The group piles of the bridge are located in sandy cobble ground and there is strict requirement on the settlement of the bridge. Therefore, there are great risks in the construction of the mined tunnel. Most of the group piles are consolidated by composite bolt piles, while 2 group piles are not consolidated by composite bolt piles. Analysis is made on these two cases and conclusion is drawn that in sandy cobble ground, although the composite bolt piles can protect the bridge piles, the installation of the composite bolt piles can induce settlement to the bridge. It is proposed that whether composite bolt piles should be installed or not shall be determined according to the conditions of the sandy cobble ground so as to avoid unnecessary waste.

Key words: mined tunnel, sandy cobble ground, composite bolt pile, existing bridge pile, settlement