Steel corrugated culvert pipe, prefabricated corrugated culvert pipe construction technology

The prefabricated steel corrugated culvert offers numerous advantages including exceptional strength, a lightweight structure, ease of transportation, and straightforward installation processes. To address the challenges posed by frost heave and foundation settlement in various regions, both inner and outer surfaces of these corrugated pipe sections, along with the fastening bolts, are treated with hot-dip galvanization to thwart rust development. The galvanized layer has a thickness of at least 63μm with an average of 84μm; additionally, asphalt coating is applied during installation to ensure a design life of up to 100 years.

Understanding the Corrugated Steel Pipes

The corrugated steel pipe (plate) culvert derives its strength from the interaction between the pipe and its surrounding backfill soil. Proper support from the backfill is crucial; insufficient or uneven reactions can result in deformation exceeding permissible levels.

Construction Process

The construction of the culvert entails several fundamental steps:

• Excavation
• Construction layout
• Foundation cushion filling
• Pipe installation
• Culvert backfill
• Opening paving

Excavating the Base

1. When specified in the design, excavate the foundation according to the set standards; otherwise, reference the following guidelines for cushion thickness and groove width.

Handling Different Foundation Types

The foundation pit should be treated appropriately based on soil type:

• High-quality land foundations necessitate removing any hard objects.
• For general soil, ensure proper compaction is greater than 90% to support smooth pipe placement.
• Rock foundations must avoid rigid installations directly on hard surfaces, requiring soft rock excavations with high-quality fill instead.
• Soft soil locations need supportive measures such as CFG foundation piles or adequate gravel cushions.

Installation Procedures

4. Pipe body installation must be meticulously prepared to ensure success:

• Equipment and tools should be well-organized and ready prior to installation.
• Conduct thorough checks to confirm all components align with design specifications, adjusting where necessary.

Pipe Connections

Connect each sewer segment carefully, using appropriate materials to fill gaps without compromising structural integrity. After installation, verify that all connections meet the original design requirements.

Backfilling and Foundation Integrity

The backfilling can be undertaken via two methods: embankment or reverse slot backfill, ensuring proper soil compaction throughout.

Finalize construction with the considerations for paving and slope protection at the tunnel entrance, ensuring robust materials and precise measurements are observed.

Completion of these steps ensures a sturdy, reliable culvert system capable of withstanding environmental challenges for many years to come.