Installing the loose base course
Install and compact the base course (road foundation).
Use material specified by the construction manager/foreperson.
Restoring the asphalt layer and sealing the joint
Install and compact the surface.
Layer-by-layer diagram of the pipe trench following installation
- A Load-bearing substrate
- B Sewer line
- 0 Foundation layer enclosed in fabric (necessary for soil with insufficient load-bearing capacity)
- 1 Lower bedding layer
- 2 Upper bedding layer
- 3.1 Side backfill (first layer)
- 3.2 Side backfill (second layer)
- 4 Pipe covering
- 5.1 Primary backfill (first layer)
- 5.2 Primary backfill (second layer)
- 5.3 Primary backfill (third layer)
- 5.4 Primary backfill (fourth layer)
- 6 Loose base course
- 7 Asphalt layer
Careful installation and proper compaction of each layer protects the pipe against damage!
The fill above the pipe (covering and primary backfill layers) has a very high weight, placing a high load on the pipe.
Good compaction of the fill in the trench against the in-situ soil somewhat reduces this load (from the fill, road surface and traffic) by transferring part of it into the trench wall.
Through careful compaction in the haunch area beneath the pipe, careful installation of the lower bedding layer and creation of a load-bearing trench bottom, the loads acting on the pipe are safely and evenly transferred to the load-bearing substrate.
Pipe embedment
- 1 Load-bearing substrate
- 2 Foundation layer
- 3 Lower bedding layer
- 4 Upper bedding layer
- 5 Pipe embedment
- 6 Side backfill
- 7 Pipe covering
- 8 Primary backfill
- 9 Loose base course
- 10 Asphalt layer
Testing for leaks
The inflatable pipe plugs and branch pipe plug are inserted and expanded.
The intermediate area is filled with compressed air.
The branch line is considered to be sealed if the air pressure is maintained for a certain length of time.
The connection must remain sealed over the long term. To ensure this, follow the manufacturer’s instructions.