Patent ID: 6159399
Filing Date: 2000-12-12
Classification: E04B,E04G

Abstract:
A spreader pipe for placing between and bracing boarding plates parallel to each other at a distance equal to a thickness of a concrete wall to be erected by pouring liquid concrete into an interspace between the boarding plates, comprising:the spreader pipe being sufficiently stiff to brace the boarding plates separated from each other when force is applied urging the boarding plates toward each other;the spreader pipe having a wall comprising(1) at least one hole communicating with an interior of the spreader pipe and a continuous, impermeable cuff covering the at least one hole in the spreader pipe such that liquid concrete being poured into the interspace between the boarding plates cannot pass through the at least one hole into the spreader pipe wherein the cuff permits grout to flow through the at least one hole in the wall of the spreader pipe as the grout is forced into the interior of the spreader pipe after the liquid concrete has set and the boarding plates are removed from the concrete wall being erected, so that the grout flows from the spreader pipe to enter hollow spaces or cracks in areas of the concrete wall adjacent to the spreader pipe; or(2) at least one weak point wherein the spreader pipe is impervious to the liquid concrete to be poured into an interspace between the boarding plates and wherein the weak points are such that they burst under pressure from the grout being forced into the spreader pipe, thereby allowing the grout to flow into hollow spaces or cracks in the concrete wall being exerted, outside the wall of the spreader pipe;thereby making the concrete wall substantially waterproof in the areas adjacent to the spreader pipe.