1. Foundation pit support and dewatering engineering

Excavation depth of more than 3m (including 3m) or not more than 3m but the geological conditions and surrounding environment complex foundation pit (trough) support, dewatering engineering。

2. Earthwork excavation works

Earthwork excavation of foundation pit (trough) with a depth of more than 3m (including 3m)。

3. Formwork engineering and support system

(A) All kinds of tool formwork projects: including large formwork, sliding form, climbing form, flying form and other projects。

(2) Concrete formwork support project: the height of 5m and above;Erection span of 10m and above;The total construction load is 10kN/㎡ and above;Concentrated line load 15kN/m and above;Concrete formwork with a height greater than the projected horizontal width of the support and relatively independent and unconnected members。

(3) Load-bearing support system: used for steel structure installation and other full support system。

Fourth, lifting and installation disassembly works

(A) the use of unconventional lifting equipment, methods, and a single lifting weight of 10KN and above lifting engineering。

(2) Installation works using lifting machinery。

(3) Installation and disassembly of lifting machinery and equipment itself。

Fifth, scaffolding engineering

(A) the erection of a height of 24m and above the floor type steel scaffold project。

(2) Attached integral and fragment hoisting scaffold works。

(3) cantilever scaffold engineering。

(4) Hanging basket scaffold project。

(5) Self-made discharge platform, mobile operation platform project。

(6) New and special-shaped scaffolding works。

6. Demolition and blasting works

(1) Demolition works of buildings and structures。

(2) demolition works by blasting。

Vii. Others

(1) Building curtain wall installation project。

(2) Steel structure, grid and cable membrane structure installation works。

(3) manual excavation and reaming pile engineering。

(4) Underground digging, pipe jacking and underwater operations。

(5) Prestressed engineering。

(6) The use of new technologies, new processes, new materials, new equipment and no relevant technical standards of greater risk of sub-projects。