Project type: foundation pit project

Project Information:Proposed building on the ground4Underground floor,1~2Layer, foundation pit depth7.2~15.2m, with an area of about1.9wan㎡.

Construction technology:Bored piles+Section steel composite steel support

Start time:2021years1month28day

Project Introduction: This projectHefei IKEA Furniture Co., Ltd. invested in the construction of large furniture market,for2020Local provincial and municipal key projects,Located at the intersection of Mengcheng North Road and Linquan Road, Luyang District, Hefei City, the surrounding environment is complex, to the east5Line No. 1 subway station, south3Line No. Subway station, west according to the residential community and municipal pipeline box culvert.

A rendering of the IKEA project in Hefei

The project contract duration is6The original design scheme is:Bored piles+High pressure rotary jet grouting pile water stop+Section steel composite steel supportAnd some of the supporting nodes are still treated with reinforced concrete. As the concrete needs to be cured, the construction period will be extended. Shanghai Qiangqiang has optimized the original scheme. On the premise of ensuring the safety and construction quality of the foundation pit, the envelope structure and some support points are replaced by new technology, as follows:

Foundation pit excavation drawing

1In terms of the envelope structure, the envelope pile is constructed by pressure grouting pile (undisturbed earth taking pressure pouring concrete pile, Shanghai Strong foundation patent).Compared with the traditional cast-in-place pile construction technology, the construction of press-poured pile is not only free of mud discharge, green and environmental protection, but also efficient (the piling time of a single press-poured pile is1~2h, the traditional cast-in-place pile forming time is6~8h).In this project, the construction period of enclosure pile is saved by about one month after adopting this technology.

2In terms of support system, the original scheme adopts sectional steel composite steel support, and some of the nodes still use reinforced concrete. As the concrete needs to be cured, the construction period will be delayed. By replacing reinforced concrete structures with steel members specially designed for strong foundations in Shanghai,Make the whole support into an all-steel system, eliminating the need for concrete curing this process.In this project, the supporting period is saved about half a month after adopting this technology.

Panoramic view of foundation pit excavation to the first support

Panoramic view of foundation pit excavation to bottom

At present, the project has been basically completed, the construction period has been shortened1/4And the deformation of the foundation pit is controlled in2cmOr less. The construction efficiency and quality of Shanghai strong foundation have been affirmed by Party A.