| 摘要 |
An extension is secured to a valve box in a roadway to be repaved by coating the valve box shoulder and the bottom of the extension with a thin layer of epoxy adhesive, placing a heated neoprene gasket on the shoulder, and setting the extension in place on the gasket. Heating makes the gasket pliable, and heat from the gasket assists in curing the adhesive. A curing-type liquid sealant is introduced into the space around the periphery of the extension to prevent the entry of water, salt and other corrodents.
|
