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Manhole Collar Repair

GENERAL MANHOLE COLLAR REPAIR SPECIFICATION:

This specification applies to the following types of trench shields:
MH SHIELDS

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.
• 1/8″ steel sheet with a 55,000 psi minimum yield strength shall be used to replace the skin plate cut away from the collars.
• The replacement Collar shall be manufactured by GME.

PROCEDURE

1. Cut damaged collar from the man hole end return, being careful not to cut into the vertical tubes.
2. Clean the area to be welded thoroughly with a wire brush or grinding wheel.
3. Weld the replacement collar to the tubes in all accessible locations using a continuous 3/16″