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Liner Collar Repair

LINER COLLAR REPAIR SPECIFICATION:

This specification applies to the following types of trench shields:
3M, 4L, 4M, 6M, 8M, T, E, N, K, and LD

SPECIFICATIONS:

• All welding shall be performed according to the Structural Welding Code for Steel – AWS D1.1-90
• A certified welder shall perform all welding.
• 70,000 psi welding rod or wire shall be used to complete the welds.
• 3/16″ steel sheet with a 55,000 psi minimum yield strength cut away from the collar.
• The Replacement Collar shall be manufactured by GME.

PROCEDURE

1. Identify collar that needs replacing.
2. Cut old collar out, being careful not to cut into the vertical tubes. Clean the area to be welded thoroughly with a wire brush or grinding wheel.
3. Insert assembly into collar opening in frame, making sure in leaving a gap between frame and outer pipe (collar) to insure full penetration weld.
4. See detail in step four illustration for gap and welding details.