| 摘要 |
A system to impart controlled rigidity to the flexure of a molded plastic structural module is provided. In the system a means for effectively bonding two plastic members and which maintains the integrity of the bond under severely ambient conditions resulting from differences in coefficients of expansion, moisture, flexing and the like, is disclosed. Delamination of the bond, particularly under the flexing condition is minimized by an intermittent bonding surface such as by bonding at the peaks or top points solely of a serrated surface. The system is particularly useful in the provision of a rigidizing member for treads of a plastic stair module for swimming pools. In use as a support for prefabricated plastic swimming pool stair modules, the preformed stair module is equipped with a suitable structural shaped metal rigidizing element that has been encapsulated in a plastic composition. The rigidizing element is then bond to the underside of the tread areas of a plastic stair module which has a discontinuous or serrated surface. This preformed stair module is then fitted at the construction site with support posts that are secured to the rigidizing structural element under the stair tread areas and the stair module is lowered in place and leveled. The bottom of the post is then secured in concrete to provide a footing.
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