One round rubber washer (g) on one
Annular groove in front socket ring for field assembly. Grouting tape (H) wrapping
Around the joint and tied firmly on both sides, assembled on site as a mold.
The cement mortar slurry (I) is poured into the joint space. Internal joint space is
Sharp (filled) cement mortar (j).
During World War II, domestic steel coils and steel plates were in short supply.
Bedding equipment; the possibility of reinforcement is slightly better. thus,
American Pipeline Establishment (USA), cement mortar lined copperplate
Steel pipe consumer manufacturer, his name was later changed to the group company 1970,
Developed 1942 tube and reinforced steel bars to supplement cylinder area