| 超长距离钢顶管穿越富水砂层的关键技术 |
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| 引用本文： | 郑守铭.超长距离钢顶管穿越富水砂层的关键技术[J].福建工程学院学报,2022,0(4):322-326. |
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| 作者姓名： | 郑守铭 |
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| 作者单位： | 福州城建设计研究院有限公司 |
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| 摘 要： | 以福建省平潭及闽江口水资源配置工程中穿越乌龙江的钢顶管为例，研究超长距离钢顶管穿越富水砂层的顶力控制与安全保障等关键技术。 钢管在高渗透性地层中顶进，选用泥水平衡顶管机，严控管节质量，工作井洞口以高压旋喷桩加固。 为保持超长距离顶管稳定受力状态，设计中将管道河床埋深设计为8~10 m，最大总顶力估算为29 000 kN，并设置3 个中继间。 实际工程中，配置添加纯碱与CMC 的膨润土泥浆作为润滑剂，减阻效果良好，实测顶进力不超过4 000 kN。 该案例可为类似超长距离穿河钢顶管的设计提供参考。
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| 关 键 词： | 钢顶管 富水砂层 超长距离 |
Key techniques of super-long-distance steel pipe jacking through water-rich sand stratum |
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| ZHENG Shouming.Key techniques of super-long-distance steel pipe jacking through water-rich sand stratum[J].Journal of Fujian University of Technology,2022,0(4):322-326. |
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| Authors: | ZHENG Shouming |
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| Institution: | Fuzhou City Construction Design & Research Institute Co., Ltd. |
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| Abstract: | Taking the steel pipe jacking crossing the Wulong River in the project of resources allocation in Pingtan and Minjiang Estuary as an example, the jacking force control and engineering security of ultra-long-distance steel pipe jacking through the water-rich sand stratum was studied. For the jacking drive in high-permeability stratum, the slurry balance pipe jacking machine was selected. The quality of the steel pipe were strictly controlled. The opening of the working well was reinforced with high-pressure jetting piles. In order to maintain the stable stress state of super-long-distance pipe jacking, the design value of the buried depth of the pipeline in the river bed was 8~10 m, and 3 the maximum total jacking force was estimated as 29 000 kN intermediate jacking stations were set up. In actual engineering, soda ash and CMC were added into the bentonite mud as the lubricant, which exhibited a good drag reduction effect. The measured jacking force did not exceed 4 000 kN. The implementation of this case can provide a reference for the design of similar ultra-long-distance river-crossing steel pipe jacking. |
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| Keywords: | steel pipe jacking water-rich sand stratum super-long distance |
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