Patent ID: 8225577
Filing Date: 2012-07-24
Classification: E04H

Abstract:
1. A method of producing in-ground spas or pools from concrete pours around liner-like cores, the liner-like cores being located in a cavity and defining sidewalls and floors, wherein the method comprising the steps of: excavating a cavity below the spa's or pool's ground plane; supplying a thin-walled, leak-resistant core whose outer contour substantially defines the form of the cavity; suspending the core using a suspension system around the excavated cavity such that there is a surrounding air-gap of clearance between said core and said cavity; introducing ballast into the core gradually; pouring wet concrete gradually with said air-gap the initiation of the pouring follows the introducing of the ballast; continuing to introduce ballast and pouring such that the amount of ballast remains greater than the amount of wet concrete, so that the ballast combats the core from dislodging from position and floating up during the pouring of wet concrete; allowing the wet concrete to harden; removing the ballast; applying a dislodging force between the hardened concrete and the core; and removing the core.