The safety investment of subgrade and pavement includes these.

Mainly includes the following contents: 1. Office, travel and other management expenses of the project safety production management department. 2. Salaries, bonuses and benefits of full-time safety management personnel. 3. Personal safety protection articles and appliances. 4. The limb, the mouth of the cave safety protection facilities. 5. Temporary electricity safety protection. 6. Scaffolding safety protection. 7. Mechanical equipment safety protection facilities. 8. Fire fighting facilities and equipment. 9. The cost of civilized construction measures on the construction site. 10. Safety training and education expenses. 1 1. The purchase, manufacture and installation costs of safety signs, slogans and safety operation procedures boards. 12. Safety assessment fee. 13. Seasonal safety expenses (expenses for heatstroke prevention and cooling drugs and drinks in summer and anti-skid and anti-freezing measures in winter). 14. Emergency equipment and medicines for construction sites. 15. Expenses for other special safety activities.

Subgrade is the foundation of track or pavement, and it is a geotechnical structure formed by excavation or filling. The main function of subgrade is to provide necessary conditions for the laying of track or pavement and the operation of train or traffic, to bear the static load, dynamic load and traffic load of track and locomotive or pavement, and to transmit and disperse the load to the depth of foundation. On the longitudinal section, the subgrade must ensure the elevation required by the line. On the plane, the subgrade is connected with bridges and tunnels to form a complete through line. In civil engineering, subgrade plays an important role in engineering quantity, occupied area and investment.