A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Ultrahigh pressure rotary jet grouting method suitable for sandy cobble stratum shield end well reinforcement
The invention discloses an ultrahigh pressure rotary jet grouting method suitable for sandy cobble stratum shield end well reinforcement. Follow-pipe drilling is performed on a sandy cobble stratum through a reverse circulation drilling machine, and hole leading is performed. A PVC sleeve with the diameter being 20 cm is arranged in a follow pipe, and the PVC sleeve is smaller than the sleeve and is used for replacing the follow pipe to form a hole forming protecting wall. After ultrahigh pressure water flow and air sprayed out of the upper portion of an ejector cut the sandy cobble stratum for the first time, a drill pipe is lifted, and therefore ultrahigh pressure cement grout sprayed out of the lower portion of the ejector secondarily cuts an original stratum for the second time, and the original stratum is reinforced into a pile. By arranging a pore water pressure meter, an inclinometer, a sedimentation magnetic ring and other monitoring instruments, influences of ultrahigh pressure rotary jet grouting on buildings nearby a shield end well are mastered in real time, and dynamic cooperative work of grouting reinforcing and measurement supervision is achieved. Compared with an existing sandy cobble stratum shield end well reinforcement technology, according to the ultrahigh pressure rotary jet grouting method, the pile forming diameter is large, construction efficiency is high, the reinforcing effect is good, cost is low, economic benefits are remarkable, and the method has great practical significance.
Ultrahigh pressure rotary jet grouting method suitable for sandy cobble stratum shield end well reinforcement
The invention discloses an ultrahigh pressure rotary jet grouting method suitable for sandy cobble stratum shield end well reinforcement. Follow-pipe drilling is performed on a sandy cobble stratum through a reverse circulation drilling machine, and hole leading is performed. A PVC sleeve with the diameter being 20 cm is arranged in a follow pipe, and the PVC sleeve is smaller than the sleeve and is used for replacing the follow pipe to form a hole forming protecting wall. After ultrahigh pressure water flow and air sprayed out of the upper portion of an ejector cut the sandy cobble stratum for the first time, a drill pipe is lifted, and therefore ultrahigh pressure cement grout sprayed out of the lower portion of the ejector secondarily cuts an original stratum for the second time, and the original stratum is reinforced into a pile. By arranging a pore water pressure meter, an inclinometer, a sedimentation magnetic ring and other monitoring instruments, influences of ultrahigh pressure rotary jet grouting on buildings nearby a shield end well are mastered in real time, and dynamic cooperative work of grouting reinforcing and measurement supervision is achieved. Compared with an existing sandy cobble stratum shield end well reinforcement technology, according to the ultrahigh pressure rotary jet grouting method, the pile forming diameter is large, construction efficiency is high, the reinforcing effect is good, cost is low, economic benefits are remarkable, and the method has great practical significance.
Ultrahigh pressure rotary jet grouting method suitable for sandy cobble stratum shield end well reinforcement
LI GUYANG (author) / GONG ZHENYU (author) / LIU ZHIGANG (author) / LI XIAOLIANG (author) / ZHENG SONGWU (author) / HU RUCHENG (author)
2015-11-18
Patent
Electronic Resource
English
IPC:
E02D
FOUNDATIONS
,
Gründungen
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