Page 182 - Water Standards
P. 182
ping.
3) The technology requirements for steel pipe installation shall
meet the requirements in Article 5 1 17 of this specifica⁃
tion.
3 8 4 Exposed steel pipe construction shall meet the following re⁃
quirements:
1 The excavation of the steel pipe line shall meet the require⁃
ments in Article 2 3 2 of this specification. The pipe trench shall be
excavated with pre⁃splitting blasting. Loosing rock shall be cleared.
Drainage system shall be carried out and slopes shall be treated.
2 The construction of anchorage blocks and supporters shall
meet design requirements, and also meet the requirements in Sections
2 7 and 2 8, and Article 2 3 2 of this specification.
3 The procedure and requirements for steel pipe installation
shall meet the following provisions:
1) During the process and installation of pressure steel pipe,
deformation or damage shall be avoided.
2) The right installation procedure shall be selected. The el⁃
bows shall be fixed first, and then according to the
position of the expansion joints, installation from bottom to
top (when the expansion joint is close to the downstream
side of the anchorage block), or in upstream and down⁃
stream directions ( when the expansion joint is between
two anchorage blocks).
3) Steel pipe temperature shall be timely measured during in⁃
stallation, and based on this, the surplus length of the
expansion joint is correctly determined.
4) Longitudinal seams of adjacent pipe sections shall not be
arranged the same straight line.
5) Cableway or flat rail wagons can be used to transport steel
1 7 5