Work Brief: Buchan Trap Replacement & Manhole Installation

Cracked Buchan Trap London

Table of Contents

Location: London, UK
Date: September ’25


📍 Project Summary

The Drains24 team attended site following reported drainage issues. Upon excavation and investigation, a cracked Buchan trap was discovered at depth. This required removal and replacement to restore full drainage functionality and provide the customer with future access for maintenance.


🔧 Scope of Work

  1. Excavation & Investigation
    • Carefully excavated to expose the drainage line and inspect the fault.
    • Found a cracked Buchan trap, which was contributing to restricted flow and potential structural compromise.
  2. Pipework Installation
    • Removed the damaged trap.
    • Supplied and installed new 150mm uPVC pipework to restore the drainage flow and meet current specifications.
  3. New Manhole Construction
    • Built a 3-ring concrete manhole chamber to provide future access to the pipe run.
    • Fitted with a robust cover and frame at ground level for ease of inspection and jetting access.

🧱 Materials & Equipment Used

  • 150mm uPVC underground drainage pipe
  • Concrete manhole rings and base
  • Cover and frame
  • Excavation tools and safety barriers
  • Backfill and compaction materials

✅ Outcome

  • Damaged Buchan trap successfully removed.
  • New pipework installed with proper gradient and flow direction.
  • Manhole installed in line with current drainage standards.
  • Site left clean and safe upon completion.
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