Rectangular pipe jacking in complex environment pretreatment and construction technology of boulder area
NIU Weiwei1,2, HUANG Weihong1, CHEN Yulin3, LIU Jiankun1*, CHEN Xuehua4
(1. School of Civil Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China;
2. School of Energy and Water Conservancy, Shenyang Institute of Technology, Shenyang 113122, Liaoning, China;
3.China Railway Tunnel Group Co., Ltd., Large Shield Engineering Branch, Zhuhai 519090, Guangdong, China;
4. Guangzhou Jintu Geotechnical Engineering Technology Co., Ltd., Guangzhou 510275, Guangdong, China)
Abstract: To solve the construction difficulties of the rectangular pipe jacking in the area of isolated stones in a complex geological environment, based on the pipe jacking project of the pedestrian passage of the Qieye Ridge in the transformation project of the Harbor Avenue in Xiangzhou District, Zhuhai City, Guangdong Province, the construction risks encountered by isolated stones during pipe jacking excavation were analyzed in conjunction with the actual engineering conditions. According to the size, shape, and distribution of the isolated stones, the advantages and disadvantages of different construction schemes when encountering isolated stones during pipe jacking construction process were discussed, and the engineering costs, environmental impact, construction difficulty, safety, and applicability of five obstacle handling schemes were systematically compared and analyzed. The best handling method suitable for this case project was selected to achieve the purpose of improving efficiency, reducing costs, and avoiding risks. The case project adopted the pre-treatment construction technology of the down-the-hole hammer in the casing technology to crush and remove the isolated stones, and successfully restored the pipe jacking excavation construction. This solution can ensure efficient, safe, and orderly clearance work and has excellent application effects. It can also provide reference for the construction of similar pipe jacking projects with similar geological conditions in the future.
