A construction method for building underground structures with large-diameter pipe jacking combined with hole piles

Abstract

The invention discloses a new construction method for repairing an underground structure through combining pipe-jacking with large diameter and hole piles. The new construction method comprises the steps of utilizing an open cutting operation foundation pit for excavating pilot tunnels, jacking steel pipes, and meanwhile, grouting soil bodies at the upper parts of the steel pipes at reserved grouting holes of the steel pipes; welding transverse struts in the steel pipes, constructing a bottom plate, a steel pipe column and a top plate, manual hole digging pile, carrying out manual hole digging in the pilot tunnels, carrying out steel bar binding on manual hole digging piles, and pouring crown beams; opening a slot at a distance of longitudinal directions of adjacent steel pipes, and welding steel plates so as to form lateral piercing; forming preliminary bracing through a reinforced concrete cross beam or a structural steel cross beam; excavating an underground first floor layer, cutting excess steel pipes and welding the steel plates so as to connect the adjacent steel pipes; after excavating to a middle plate, pouring the middle plate and side walls; excavating an underground second floor layer, and constructing the bottom plate and the side walls; and finally filling plain concretes in pilot tunnel clearances. When the construction method is used for constructing the underground structure, the steel pipes, the cross beam and the manual hole digging piles form a support for the soil bodies, so that large-section excavation is realized, the influence of the construction of the underground structure on surrounding buildings and environment is reduced, and meanwhile, the cost is saved, and the construction cost is reduced.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to a construction method for constructing an underground structure by combining large-diameter pipe jacking with hole piles. Background technique [0002] The pipe curtain construction method was first used in Japan to build a passageway project across the railway. The first use of the pipe curtain construction method in China was in the construction of an underground passage in a city in Hong Kong. After many years of domestic research and successful implementation in engineering, the pipe curtain construction method has matured. However, due to the small diameter of the traditional pipe curtain structure, the construction inside the pipe is difficult, and the transverse rigidity between the pipes is relatively weak, which makes it impossible to excavate a large section. Stability, resulting in slower construction progress. Most of the transverse sections are a...

AI Technical Summary

Problems solved by technology

However, due to the small diameter of the traditional pipe curtain structure, the construction inside the pipe is difficult, and the transverse rigidity between the pipes is relatively weak, which makes it impossible to excavate a large section. Stability, resulting in slower construction progress

Most of the transverse sections are arch structures, and the space utilization rate is low

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