Method for realizing large-section underground space excavation by virtue of small-section combined jacking pipe

Abstract

The invention discloses a method for realizing large-section underground space excavation by virtue of a small-section combined jacking pipe, and relates to the technical field of tunnel construction.The method comprises the following steps: producing a jacking pipe starting well and a jacking pipe receiving well through open cutting; connecting small-section jacking pipe sections into an integrated-structure frame; sequentially excavating a soil mass in an underground structure in a layered manner from top to bottom under a supporting condition formed by the whole pipe sections; detaching reinforced concrete at the positions of vertical columns, steel pipe sections in sectional-steel combined pipe sections, and middle universal pipe sections, and producing a vertical column structure; and detaching reinforced concrete among the vertical columns, the steel pipe sections in the sectional-steel combined pipe sections, and the middle universal pipe sections, arranging corner reinforcingbrackets, and producing a portal ring beam. According to the method, the construction occupies less space and basically has no influence on ground transportation, municipal pipelines do not need to bemoved, and high construction efficiency is achieved; and meanwhile, the own retaining soil mass of the structure is utilized, a building envelope is omitted, the engineering investment is saved, andthe requirement of green construction is also met.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for realizing large-section underground space excavation by using small-section combined pipe jacking. Background technique [0002] At present, the construction methods of underground engineering at home and abroad mainly include open-cut method, cover-excavation method, mine method, shield method, and pipe jacking method. Long, need to change the pipeline, and in the complex urban environment, often do not have the conditions for open-cut construction; although the cover-and-excavation method reduces the impact of construction on urban traffic, it needs to break roads many times, relocate municipal pipelines, and pollute the environment The major disadvantages are still unavoidable; the mining method occupies a small site, has little impact on ground traffic, and does not need to change pipelines, but the construction period is long, the impact on the surro...

AI Technical Summary

Problems solved by technology

[0002] At present, the construction methods of underground engineering at home and abroad mainly include open-cut method, cover-excavation method, mine method, shield method, and pipe jacking method. Long, need to change the pipeline, and in the complex urban environment, often do not have the conditions for open-cut construction; although the cover-and-excavation method reduces the impact of construction on urban traffic, it needs to break roads many times, relocate municipal pipelines, and pollute the environment The major disadvantages are still unavoidable; the mining method occupies a small site, has little impact on ground traffic, and does not need to change pipelines, but the construction period is long, the impact on the surrounding environment is large, the requirements for the stratum are high, the construction space is small, and it is not suitable for mechanized construction. And the construction risk is relatively high; large-diameter shield tunneling and large-section pipe jacking construction equipment occupy a large space, and the adaptability of the section size is low. The equipment needs to be customized according to the section limit size requirements. The equipment research and development costs are high, and the reuse rate is low. Economical Poor; in order to meet the requirements of urban modernization, comprehensively consider the impact of construction on urban traffic, environmental protection, etc., and seek a construction that can minimize the construction area, have little environmental impact, avoid repeated road breaking and relocation of pipelines, and is easy to operate. , Cost-effective underground space excavation method is imminent

Images