Floor for a portable containment berm

Abstract

A floor for a portable containment berm has an intermediate layer of flexible puncture-resistant material sandwiched between lower and upper sheets of flexible impervious material and at least one puncture-resistant and wear-resistant tread pad fixed to the top surface of the upper sheet of flexible impervious material. In one embodiment, the layer of puncture-resistant material and the sheets of impervious material are substantially coextensive and are welded in laminar relationship along their peripheries. In another embodiment, the intermediate layer of flexible puncture-resistant material includes at least two belts of flexible puncture-resistant material with the lower and upper sheets welded in laminar relationship along their peripheries and between each adjacent pair of belts. In either embodiment, the tread pads are welded to the top surface of the upper sheet of flexible impervious material in a configuration suitable to receive the wheels of a vehicle traversing the floor of the berm.

What is claimed is: 
     
         1 . A floor for a portable containment berm comprising:
 a lower sheet of flexible impervious material;   an upper sheet of flexible impervious material;   an intermediate layer of flexible puncture-resistant material between said lower and upper sheets of flexible impervious material; and   at least one puncture-resistant and wear-resistant tread pad fixed to a top surface of said upper sheet of flexible impervious material.   
     
     
         2 . A floor according to  claim 1 , said intermediate layer of flexible puncture-resistant material comprising a sheet of flexible puncture-resistant material substantially coextensive with said lower and upper sheets of flexible impervious material. 
     
     
         3 . A floor according to  claim 2 , said lower, intermediate and upper sheets being welded in laminar relationship along their peripheries. 
     
     
         4 . A floor according to  claim 3 , said at least one puncture-resistant and wear-resistant tread pad being fixed to a top surface of said upper sheet of flexible impervious material by welding. 
     
     
         5 . A floor according to  claim 1 , said intermediate layer comprising at least two belts of flexible puncture-resistant material extending lengthwise in a lengthwise direction of said lower and upper sheets of flexible impervious material. 
     
     
         6 . A floor according to  claim 5 , said lower and upper sheets being welded in laminar relationship along their peripheries and between each adjacent pair of said at least two belts of flexible puncture-resistant material. 
     
     
         7 . A floor according to  claim 6 , said at least one puncture-resistant and wear-resistant tread pad extending lengthwise in a lengthwise direction of said at least two belts of flexible puncture-resistant material. 
     
     
         8 . A floor according to  claim 7 , said at least one puncture-resistant and wear-resistant tread pad being fixed to a top surface of said upper sheet of flexible impervious material by welding.