Pumpable rockbolt method

US3930639A · kind A · utility

Assignee

• The United States of America as represented by the United States Energy Research and Development Administration · US

Inventors

• Meyer Steinberg · Huntington, US
• Bernard Manowitz · Brightwaters, US
• Charles H. Waide · Center Moriches, US

Key dates

• Filing date: Sep 27, 1974
• Grant date: Jan 6, 1976
• Expiry date: Sep 27, 1994

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21D20/028
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

Method and apparatus for producing rockbolts in the roof of a subterranean cavity in which two components of an ambient temperature curable resin system are premixed and then inserted into a bore hole. The mixture is permitted to polymerize in situ and then the hardened material is cut off at the entrance to the hole leaving a hardened portion for insertion into the next hole as a precursor. In a preferred embodiment a flexible glass roving is employed to reinforce the material in the hole and a metal tube inserted to support the roving while it is fed into the hole and also to provide venting. The roving and tube is then cut off and left in the hole.