深基坑前排倾斜双排桩设计与亚博vip04 研究*
  • 作者: 马雪兵,余地华,郑刚,等
论文摘要

深基坑前排倾斜双排桩设计与亚博vip04 研究*

马雪兵1,余地华1,郑刚2,黄晓程1,叶建1,赖国梁1,程雪松2

(1.中建三局集团有限公司工程总承包公司,湖北 武汉 430064

2.天津大学土木工程系,天津 300072)

[摘要] 介绍了一种新的支护形式——前排倾斜双排桩,总结了该支护形式的结构性状、设计与亚博vip04 。相对于常规双排桩,因前排倾斜桩可承受轴向力,可起到一定支撑作用,更有受力优势。性状上,后桩桩身位移小于前桩、弯矩略大于前桩,支护位移最大点不在桩顶;当桩径和倾角一定时,增加前后桩桩长、缩小桩间距、缩短连梁,都可提高支护效果。若前桩进入底部硬层土,对支护效果提高更为明显。介绍了设计中需重点考虑的问题,采用全套管全回转钻机结合旋挖钻机斜成孔施工,形成成桩全过程套管护壁并最终回收,采用双层钢筋笼等专项技术解决成桩中的特殊工艺问题。

[关键词] 基坑;支护;双排桩;倾斜桩;设计;施工

[中图分类号]TU753   [文献标识码]A          [文章编号]1002-8498(2021)07-0006-05

Research on Design and Construction Technology of Front Pile Inclined of Double-row Piles in Deep Foundation Excavation

MA Xuebing1, YU Dihua1, ZHENG Gang2, HUANG Xiaocheng1YE Jian1LAI Guoliang1CHENG Xuesong2

(1.General Construction Company of CCTEB Group Co., Ltd., WuhanHubei 430064, China2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China)

Abstract: This paper introduces a new form of support front pile inclined of double-row piles, the technical contents of the structural traits, design and construction of the support are summarized. Compared with the conventional double-row pile, the front pile inclined piles can bear the axial force and play a certain supporting role, and the support has more advantages. In the trait, the displacement of the rear pile is smaller than that of the front pile and the bending moment is slightly larger than the front pile, and the maximum displacement of the support is not at the top of the pile.When the pile diameter and the inclination angle are fixed, increasing the length of the pile, reducing the spacing of the piles, and shortening the coupling beam can improve the supporting effect.If the front pile enters the bottom hard layer soil, the effect of support is more obvious. The front pile reinforcement is mainly considered to be subjected to bending and shearing, and the axial bearing is mainly composed of soil layer bearing capacity. During the construction, full casing full rotary rig and conventional rotary rig are used for oblique hole construction, forming the whole process of casing into the wall and finally recycling, special techniques such as double-layer steel cages are used to solve special process problems in piles.

Keywords:foundation excavation; supports; double-row pile; inclined pile; design; construction

*中建股份2020年本级科技研发课题:基坑工程无支撑节约型支护技术(CSCEC-2020-Z-34

[作者简介] 马雪兵,高级工程师,E-mail:191498910@qq.com

 

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