What are the technical requirements for ground drainage ditch of subgrade in expressway?

Drainage ditches are set on the subgrade ground in expressway to remove rainwater and road water. The technical requirements are as follows:

1. The design of the drainage ditch shall conform to the relevant national standards and specifications and meet the drainage requirements.

2. The drainage ditch shall be made of durable, corrosion-resistant and wear-resistant materials, such as concrete, reinforced concrete and glass fiber reinforced plastic.

3. The cross-sectional shape of the drainage ditch should be reasonable, generally trapezoidal or V-shaped, to ensure the drainage effect.

4. The slope of the drainage ditch should meet the design requirements, generally 0% ~ 3%, to ensure smooth drainage.

5. The length of the drainage ditch should be designed according to the actual situation, and generally should not exceed 500 meters, so as to facilitate maintenance and cleaning.

6. The entrance and exit of the drainage ditch shall be provided with pollution prevention facilities to prevent sundries from entering the drainage system.

7. The cover of the drainage ditch should have anti-skid, waterproof and anti-corrosion properties to ensure the service life.

8. The drainage ditch should be maintained and cleaned regularly to ensure smooth drainage and normal use of facilities.

In a word, the design and construction of subgrade surface drainage ditch in expressway should be carried out in strict accordance with relevant standards and specifications to ensure the drainage effect and the safety and reliability of facilities.