深基坑前排傾斜雙排樁設計與施工技術研究*
                                  • 作者: 馬雪兵,余地華,鄭剛,等
                                  論文摘要

                                  深基坑前排傾斜雙排樁設計與施工技術研究*

                                  馬雪兵1,余地華1,鄭剛2,黃曉程1,葉建1,賴國梁1,程雪松2

                                  (1.中建三局集團有限公司工程總承包公司,湖北 武漢 430064;

                                  2.天津大學土木工程系,天津 300072)

                                  [摘要] 介紹了一種新的支護形式——前排傾斜雙排樁,總結了該支護形式的結構性狀、設計與施工技術。相對于常規雙排樁,因前排傾斜樁可承受軸向力,可起到一定支撐作用,更有受力優勢。性狀上,后樁樁身位移小于前樁、彎矩略大于前樁,支護位移最大點不在樁頂;當樁徑和傾角一定時,增加前后樁樁長、縮小樁間距、縮短連梁,都可提高支護效果。若前樁進入底部硬層土,對支護效果提高更為明顯。介紹了設計中需重點考慮的問題,采用全套管全回轉鉆機結合旋挖鉆機斜成孔施工,形成成樁全過程套管護壁并最終回收,采用雙層鋼筋籠等專項技術解決成樁中的特殊工藝問題。

                                  [關鍵詞] 基坑;支護;雙排樁;傾斜樁;設計;施工

                                  [中圖分類號]TU753   [文獻標識碼]A          [文章編號]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 Xiaocheng1,YE Jian1,LAI Guoliang1,CHENG Xuesong2

                                  (1.General Construction Company of CCTEB Group Co., Ltd., Wuhan,Hubei 430064, China;2. 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年本級科技研發課題:基坑工程無支撐節約型支護技術(CSCEC-2020-Z-34

                                  [作者簡介] 馬雪兵,高級工程師,E-mail:191498910@qq.com

                                   

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