Mining projects can be divided into individual projects, unit projects, segment projects and sub-projects. (1) Single project A single project is an integral part of the construction project. Generally refers to projects that have independent design documents and can independently exert production capacity or benefits after completion. As new mines, mineral processing plants or constitute standards railways, power transmission engineering, mine water engineering, mining machinery plant, the total warehouse individual projects such as the mining area. Various production workshops of the machinery factory. Non-industrial projects generally refer to independent projects that can play the main benefits of the design regulations, such as dormitory and office buildings. (2) Unit project and sub-unit project Unit engineering is an integral part of a single project. Generally refers to projects that cannot independently exert production capacity or benefits but have independent construction conditions. Generally, according to the engineering contents of different natures in a single project, the part that can independently organize construction and separately prepare the project budget is divided into several unit projects. Such as single project is divided into Vertical Shaft mine, Inclined Shaft peace cave, tunnel, Tibetan stone room, ventilation and safety facilities, underground laying six unit project, the only coal mine six unit project. The single project of the machinery factory has workshop building and workshop equipment installation. Non-industrial buildings generally use a single house as a unit project (including water, electricity, heating, sanitation, etc.). Equipment installation engineering refers to the main equipment with independent installation base and separate installation conditions, and the main unit of a single equipment is used as a unit project. Sub-annual construction of wellbore, roadway and other unit projects can be divided into sub-unit projects according to the construction year. The status of unit engineering and sub-unit engineering is the same. The construction drawing design is woven according to the unit project. (3) Divisional engineering and sub-divisional engineering According to the main parts of the project, they are part of the unit project; the division and sub-projects cannot independently exert production capacity, and there is no independent construction condition, but the settlement of the project price can be carried out independently. For example, the sub-project of the vertical shaft engineering is a special well-drilling method such as a well neck, a well body, a wall seat, a wellbore, a water prevention well, a drilling wellbore, a sinking wellbore, a freezing, a concrete curtain, and the like. The divisional projects that make up the housing project include foundations, walls, and roofs. Or according to different types of work, it is divided into earthwork, reinforced concrete, decoration and other sub-projects. For the wellbore wellbore and roadway main body and other sub-division projects with different forms of support, they can be divided into sub-division projects according to different forms of support. For sub-division projects such as wellbore wells and roadway main bodies with the same supporting form, the monthly acceptance section can be divided into sub-division projects. Like the sub-unit engineering nature, the sub-division project has the same status as the sub-project. (4) Sub-project It is mainly divided into processes and types of work and is an integral part of the division project. The sub-projects also do not independently develop the production capacity and the conditions for independent construction; they can also independently settle the project price; generally, they are divided into several according to the specifications, construction procedures, types of work, construction techniques, materials or construction methods. A different sub-item that can be used to calculate workload and pricing with the same unit of measure. For example, the sub-projects of the wellbore engineering are excavation, formwork, steel bar, concrete support, bolt support, prestressed anchor cable support, shotcrete support, steel mesh shotcrete support, steel fiber shotcrete support, Precast concrete support, stone support, etc. The sub-projects of wall engineering include sub-projects such as foundation, interior wall and exterior wall. Plush Backpack,Frog Plush Backpack,Rabbit Plush Backpack,Plush Giraffe Animal Backpack Shenzhen Yida Toys Co. , Ltd. , https://www.ydatoy.com