Patent ID: 6309493
Filing Date: 2001-10-30
Classification: E04G,Y10T

Abstract:
A method of filling in a crack in a surface of a concrete structure, comprising of steps of:(a) providing a plurality of injection port members for application to said crack, the injection port members having flat base portions and tubular body portions, the tubular body portions defining hollow passages that extend through said injection port members, said members having free, open ends opposite their base portions;(b) applying said injection port members to said concrete structure surface at predetermined intervals along said crack such that said injection port member hollow passages are aligned with and directed toward said crack, and adhering said injection ports to said concrete structure surface with a settable adhesive;(c) covering the remainder of said crack with said settable adhesive while leaving an opening at a top portion of said crack and letting said settable adhesive set to define a sealed, inner passage extending through said crack in communication with said injection port hollow passages;(d) providing a supply of an injectable crack-filling material in the form of a hydrophilic one-component polyurethane prepolymer that expands and foams in response to contact with water said prepolymer not containing any granular impregnating agent entrained within it, said prepolymer supply including a disposable, aerosol supply container having dimensions such that it may be easily held and grasped in a single hand of a user, said supply container further having a dispenser assembly attached thereto with a dispensing nozzle extending therefrom, the dispensing nozzle having a tip that is engageble with said injection port members by way of said dispensing nozzle tip fitting into said injection port member free ends into communication with said injection port member hollow passages;(e) dispensing said prepolymer into said crack in a stepwise fashion from top to bottom along said crack by first engaging said prepolymer supply container dispensing nozzle tip with the lowermost injection port member hollow passage and dispensing said prepolymer into said crack through said lowermost injection port member hollow passage until said prepolymer appears at an injection port member located immediately above said lowermost injection port member;(f) closing off said lowermost injection port member by applying a deformable crimping collar to said lowermost injection port member body portion prior to engaging said, lowermost injection port member body portion with said dispensing nozzle and removing said dispensing nozzle tip from said lowermost injection port member and then applying pressure to said crimping collar sufficient to substantially collapse said lowermost injection port member hollow passage; and,(g) repeat steps (e) and (f) for subsequent injection port members positioned above said lowermost injection port member.