A method and structure to alleviate the effect of frost...

E - Fixed Constructions – 02 – D

Patent

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E02D 31/14 (2006.01) E02D 29/12 (2006.01)

Patent

CA 2309649

Frost heave of pavements around sanitary and storm sewer manholes (10) and similar installations disposed in an under the pavement (12), is a major and costly problem in cold climates. As a result of the frost heave, a difference in level is created between the manhole cover (32) and the pavement (12) around it. Due to traffic, pavement cracks are formed around the manhole (10) necessitating costly repairs. It is proposed to alleviate the problem to a substantial degree by providing a frost-heave mitigating structure in a direct vicinity of a manhole (10) or a similar installation. To this effect, a heat- transfer zone (16) filled with large granulate is formed around the manhole (10) under the pavement (12), and openings (26) are formed in the wall (24) of the manhole (10) in a way enabling heat transfer between the warmer interior of the manhole (10) and the colder heat-transfer zone (16). The heat that flows to the zone warms up the surrounding soil in the vicinity of the zone thus preventing its freezing and consequently the frost heave approximately above the zone.

Le gonflement de chaussées dû au gel autour de regards (10) d'égouts sanitaires et pluviaux, et d'autres installations similaires placées dans et sous la chaussée (12), constitue un problème majeur et coûteux sous les climats froids. Suite à un gonflement dû au gel, une différence de niveau se produit entre la plaque (32) recouvrant le regard et la chaussée (12) environnante. En raison du trafic, des crevasses se forment autour du regard (10), lesquelles nécessitent des réparations coûteuses. L'invention permet d'atténuer ce problème dans une mesure importante par l'apport d'une structure réduisant le gonflement dû au gel à proximité immédiate d'un regard (10) ou d'une installation similaire. Pour ce faire, on forme autour du regard (10) une zone de transfert de chaleur (16) qu'on remplit avec de grands granulés sous la chaussée (12), et des ouvertures (26) sont pratiquées dans la paroi (24) du regard (10) de façon à permettre un transfert de chaleur entre l'intérieur du regard (10), plus chaud, et la zone (16) de transfert de chaleur, plus froide. La chaleur qui s'écoule vers la zone réchauffe le sol environnant à proximité de la zone, empêchant celui-ci de geler, ce qui permet d'éviter par conséquent un gonflement dû au gel approximativement au-dessus de la zone.

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