Guo Pengchao

Lengthened sleeve arch for collapse preventing treatment of soft rock tunnel portal

Deformation monitoring method for shallow-buried excavation tunnel construction

Construction method for enabling shallowly buried and darkly excavated tunnel to pass through cottage area

Last soft hard ground layer subway station foundation pit down struts system

Rag bolt pre -embedded construction mould

Excavation construction technology for subway station foundation pit in upper-soft lower-hard ground

Multi -functional rag bolt pre -embedded construction mould

On descend soft formation subway station foundation pit envelope firmly

Pre-burying construction mould and method of foundation bolts used for steel structure building construction

Foundation bolt embedding construction die and foundation bolt adjusting construction method