Extended valve box and process for securing extension to valve box

Claim 2

An extended valve box resistant to traffic, corrosion moisture and temperature fluctuations comprising a valve box having a cover-retaining shoulder and a cover-retaining ring, and an extension vertically supported by said shoulder and held against horizontal translation by said cover-retaining ring, characterized by a layer of adhesive on said shoulder, a layer of adhesive on the area of the extension facing the shoulder, a flexible gasket bonded to both adhesive layers and located between the extension and the shoulder, and flexible sealant means located between the cover-retaining ring and the periphery of the extension to prevent the entry of moisture and corrodents into the spaces between the extension and the cover-retaining ring and shoulder of the valve box.

Claim 3

An extended valve box according to claim 1 in which the flexible gasket is a chloroprene gasket.

Claim 4

An extended valve box according to claim 1 in which the adhesive layers are layers of epoxy adhesive.

Claim 5

An extended valve box according to claim 1 in which the flexible gasket is a chloroprene gasket and in which the adhesive layers are layers of epoxy adhesive.

Claim 6

An extended valve box according to claim 1 including a second flexible gasket located between the periphery of the extension and the cover-retaining ring and extending around substantially the entire periphery of the extension.

Claim 7

A process for securing an extension to a valve box in a roadway to be repaved comprising the steps of: cleaning the cover-retaining shoulder of a valve box; cleaning the bottom surface of an extension compatible with the valve box at least over substantially all of the area thereof which overlies the cover-retaining shoulder of the valve box when the extension ring is in place thereon; applying a layer of adhesive to said shoulder and to said cleaned area of the bottom surface of the extension; placing a flexible gasket material on said shoulder and securing the gasket material to the shoulder by said layer of adhesive on the shoulder; placing the extension on the gasket material and securing the extension to the gasket material by said layer of adhesive on said cleaned area of the bottom surface of the extension; and filling the space between the periphery of the extension ring and the cover-retaining ring with a curable liquid sealing agent.

Claim 8

A process for securing an extension to a valve box in a roadway to be repaved comprising the steps of: cleaning the cover-retaining shoulder of a valve box; cleaning the bottom surface of an extension compatible with the valve box at least over substantially all of the area thereof which overlies the cover-retaining shoulder of the valve box when the extension ring is in place thereon; applying a layer of adhesive to said shoulder and to said cleaned area of the bottom surface of the extension; placing a flexible gasket material on said shoulder and securing the gasket material to the shoulder by said layer of adhesive on the shoulder; placing the extension on the gasket material and securing the extension to the gasket material by said layer of adhesive on said cleaned area of the bottom surface of the extension; and filling the space between the periphery of the extension ring and the cover-retaining ring with a curable liquid sealing agent.

Claim 9

A process according to claim 6 in which the flexible gasket is a chloroprene gasket.

Claim 10

A process according to claim 6 in which the adhesive is an epoxy adhesive.

Claim 11

A process according to claim 6 in which the flexible gasket is a chloroprene gasket and the adhesive is an epoxy adhesive.

Claim 12

A process according to claim 6 including the step of placing a second flexible gasket between the periphery of the extension and the cover-retaining ring of the valve box.

Claim 13

A process according to claim 6 including the steps of cleaning the inwardly facing surface of the cover-retaining ring of the valve box, cleaning the periphery of the extension at least over substantially all of the area thereof which lies opposite to the cover-retaining ring when the extension ring is in place therein, and, before placing the flexible gasket material on said shoulder, applying layers of adhesive to said inwardly facing surface of the cover-retaining ring and to said area of the periphery of the extension.

Claim 14

The process of claim 6 in which the adhesive layers on said shoulder and on said cleaned area of the bottom surface of the extension ring are thin layers of a heat-curable adhesive, and including the step of heating the flexible gasket material to a temperature sufficient to effect a substantial increase in the pliability thereof before placing it on said shoulder, whereby the gasket material is more easily set in place, and heat from the gasket material assists in curing the adhesive layers.