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Shield receiving construction method close to existing subway operation line in water-rich silty sand stratum
A shield receiving construction method close to an existing subway operation line in a water-rich silty sand stratum comprises the steps that measures are taken before shield receiving, specifically,a triple-pipe jet grouting pile is adopted to be matched with a three-axis stirring pile to reinforce an end well, dewatering wells are arranged outside the end well, and a steel sleeve is arranged inthe end well; measures are taken during construction, speed reduction is conducted on the existing line in the existing line crossing and receiving construction process, shield tunneling is kept at aconstant speed, synchronous grouting is conducted behind the middle wall in the tunneling process, and automatic monitoring on the existing line and earth surface monitoring are conducted; and measures are taken after shield receiving and entering a tunnel, specifically, after a shield enters the tunnel, the connecting area of the steel sleeve and a tunnel portal is rapidly blocked, secondary grouting is conducted on the inner wall of the formed tunnel, and deep hole grouting is adopted in the existing line range. In the existing line crossing process, slow construction is conducted, the tunnel is reinforced, the end well is provided with the dewatering reinforcing measures combined with rapid plugging after entering the tunnel, ground collapse is avoided, and safety is guaranteed; the whole process is simple and easy to popularize; and reinforcement or isolation pile construction of the existing line is omitted, and cost is saved.
一种富水粉砂地层中临近既有地铁运营线的盾构接收施工方法，包括盾构接收前措施，采用三重管旋喷桩配合三轴搅拌桩进行端头井加固，在端头井外设置降水井，在端头井内设置钢套筒；施工中措施，在穿越既有线及接收施工中对既有线进行降速，盾构保持匀速掘进，掘进过程中壁后同步注浆，并对既有线自动化监测及地表进行监测；盾构接收进洞后措施，进洞后，对钢套筒和洞门连接区域进行快速封堵，在已成型的隧道内壁后二次注浆，对既有线范围内的采用深孔注浆。穿越既有线过程缓慢施工并加强隧道，端头井设置降水加固措施结合进洞后快速封堵，避免地面坍塌，保证安全；整体流程简单，易推广；取消了既有线的加固或隔离桩施工，节约成本。
Shield receiving construction method close to existing subway operation line in water-rich silty sand stratum
A shield receiving construction method close to an existing subway operation line in a water-rich silty sand stratum comprises the steps that measures are taken before shield receiving, specifically,a triple-pipe jet grouting pile is adopted to be matched with a three-axis stirring pile to reinforce an end well, dewatering wells are arranged outside the end well, and a steel sleeve is arranged inthe end well; measures are taken during construction, speed reduction is conducted on the existing line in the existing line crossing and receiving construction process, shield tunneling is kept at aconstant speed, synchronous grouting is conducted behind the middle wall in the tunneling process, and automatic monitoring on the existing line and earth surface monitoring are conducted; and measures are taken after shield receiving and entering a tunnel, specifically, after a shield enters the tunnel, the connecting area of the steel sleeve and a tunnel portal is rapidly blocked, secondary grouting is conducted on the inner wall of the formed tunnel, and deep hole grouting is adopted in the existing line range. In the existing line crossing process, slow construction is conducted, the tunnel is reinforced, the end well is provided with the dewatering reinforcing measures combined with rapid plugging after entering the tunnel, ground collapse is avoided, and safety is guaranteed; the whole process is simple and easy to popularize; and reinforcement or isolation pile construction of the existing line is omitted, and cost is saved.
一种富水粉砂地层中临近既有地铁运营线的盾构接收施工方法，包括盾构接收前措施，采用三重管旋喷桩配合三轴搅拌桩进行端头井加固，在端头井外设置降水井，在端头井内设置钢套筒；施工中措施，在穿越既有线及接收施工中对既有线进行降速，盾构保持匀速掘进，掘进过程中壁后同步注浆，并对既有线自动化监测及地表进行监测；盾构接收进洞后措施，进洞后，对钢套筒和洞门连接区域进行快速封堵，在已成型的隧道内壁后二次注浆，对既有线范围内的采用深孔注浆。穿越既有线过程缓慢施工并加强隧道，端头井设置降水加固措施结合进洞后快速封堵，避免地面坍塌，保证安全；整体流程简单，易推广；取消了既有线的加固或隔离桩施工，节约成本。
Shield receiving construction method close to existing subway operation line in water-rich silty sand stratum
富水粉砂地层中临近既有地铁运营线的盾构接收施工方法
DENG JIANLIN (author) / LI HAIBO (author) / LIU YANG (author) / XUE WENJING (author) / ZHAO XINGXING (author) / FAN RUNDONG (author) / LIU FUSHENG (author) / MA XIANG (author) / LIU XIAOBO (author) / SHI JIQING (author)
2020-12-04
Patent
Electronic Resource
Chinese
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