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Quick tunneling construction method for large diameter shielding
The invention discloses a quick tunneling construction method for large diameter shielding. The method specifically comprises the following steps of S1, before shield tunneling, measuring the bottom of a terrain first, and making geological prediction according to ground deformation monitoring data and parameters adopted by shield construction; S2, according to a geological condition, controllingthe pressure of muddy water strictly as required, and controlling deviation within +/-0.015 MP; S3, in the shield tunneling construction process, selecting a shield tunneling construction mode according to the geological condition, adopting an earth pressure balance mode in a formation which is soft on the upper part and hard on the lower part, and adopting an under-pressure mode in a hard rock formation; S4, carrying out synchronous grouting while propelling by a shield tunneling machine, wherein the synchronous grouting amount is 140% of a theoretical gap between a shield tail and a duct piece, and synchronous grouting slurry is formed by uniformly mixing silicate cement, coal ash, fine sand, silica fume, bentonite, foamed polystyrene, an expander and water; and S5, after synchronous grouting, carrying out secondary grouting, wherein secondary grouting slurry is double slurry composed of cement slurry and water glass.
本发明公开了一种大直径盾构快速掘进施工方法，具体包括以下步骤：S1：在盾构隧道掘进前，首先对地形底部进行测量，做好地质预报，根据地面变形监测数据及盾构施工所采用的参数；S2：根据地质情况，泥水压力严格按要求控制，偏差控制在±0.015MP内；S3：盾构掘进施工过程中，根据地质情况选择盾构掘进施工模式，在上软下硬地层中采用土压平衡模式，在硬岩地层中采用欠压模式；S4：在盾构机推进同时进行同步注浆，同步注浆量按盾尾与管片之间理论空隙的140%进行，且用同步注浆浆液由硅酸盐水泥、粉煤灰、细砂、硅灰、膨润土、泡聚苯乙烯、膨胀剂和水均匀混配而成；S5：同步注浆结束后进行二次注浆时，所用二次注浆浆液为由水泥浆和水玻璃组成的双液浆。
Quick tunneling construction method for large diameter shielding
The invention discloses a quick tunneling construction method for large diameter shielding. The method specifically comprises the following steps of S1, before shield tunneling, measuring the bottom of a terrain first, and making geological prediction according to ground deformation monitoring data and parameters adopted by shield construction; S2, according to a geological condition, controllingthe pressure of muddy water strictly as required, and controlling deviation within +/-0.015 MP; S3, in the shield tunneling construction process, selecting a shield tunneling construction mode according to the geological condition, adopting an earth pressure balance mode in a formation which is soft on the upper part and hard on the lower part, and adopting an under-pressure mode in a hard rock formation; S4, carrying out synchronous grouting while propelling by a shield tunneling machine, wherein the synchronous grouting amount is 140% of a theoretical gap between a shield tail and a duct piece, and synchronous grouting slurry is formed by uniformly mixing silicate cement, coal ash, fine sand, silica fume, bentonite, foamed polystyrene, an expander and water; and S5, after synchronous grouting, carrying out secondary grouting, wherein secondary grouting slurry is double slurry composed of cement slurry and water glass.
本发明公开了一种大直径盾构快速掘进施工方法，具体包括以下步骤：S1：在盾构隧道掘进前，首先对地形底部进行测量，做好地质预报，根据地面变形监测数据及盾构施工所采用的参数；S2：根据地质情况，泥水压力严格按要求控制，偏差控制在±0.015MP内；S3：盾构掘进施工过程中，根据地质情况选择盾构掘进施工模式，在上软下硬地层中采用土压平衡模式，在硬岩地层中采用欠压模式；S4：在盾构机推进同时进行同步注浆，同步注浆量按盾尾与管片之间理论空隙的140%进行，且用同步注浆浆液由硅酸盐水泥、粉煤灰、细砂、硅灰、膨润土、泡聚苯乙烯、膨胀剂和水均匀混配而成；S5：同步注浆结束后进行二次注浆时，所用二次注浆浆液为由水泥浆和水玻璃组成的双液浆。
Quick tunneling construction method for large diameter shielding
一种大直径盾构快速掘进施工方法
YANG ZHIYONG (author) / JIANG YUSHENG (author) / CHU LIKONG (author)
2020-11-27
Patent
Electronic Resource
Chinese
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