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Four Achievements of The No.5 Construction Company Have Obtained Technical Appraisal of China National Coal Construction Association
 

 

Four achievements of the No.5 Construction Company have passed the technical appraisal of China National Coal Construction Association. First, the project "Research and Application of Grouting Technology for Extremely Thick Limestone Aquifer" adopts mud wall protection and multi-stage orifice pipe embedding technology, which effectively solves the problem of easy collapse of soft and fractured limestone when it encounters cement, improves the quality of drilling and orifice pipe embedding in soft rock stratum, and achieves the leading level in China. Secondly, the project of "Three Simultaneous Technologies of Shaft Freezing in Aquifer, Ground Pre-grouting and Well Sinking Construction in Changzhi Area" effectively solves the influence of multi-aquifer construction, improves the construction progress and quality, reduces the construction cost, guarantees the safety of shaft construction, and achieves the advanced level in China. Thirdly, the project "Key Technologies for Control of Water Inrush and Well Submergence in Railway Tunnel Shaft under Complex Geological Conditions" firstly adopted the technology of "Compound Cement Slurry Water Stop Cushion Dual-pipe Underwater Casting", which improved the compactness and sealing reliability of cement slurry stone body, ensured the construction safety and efficiency of water stop cushion, effectively closed the water gushing at the break, and the project achievement reached the international leading level. Fourthly, the project "Research and Application of Construction Technology of Underground Excavation through Freezing Method of Subway Station under Buildings" adopts multi-direction freezing hole + MJS (omnidirectional high pressure spraying method) + diaphragm wall + limit control freezing method, and uses remote control robot to dig scientifically, which has been successfully applied to the freezing underground excavation project of urban rail transit, and the project achievement has reached the international advanced level. (No.5 Construciton  Company)

 
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