METHOD, KIT AND SYSTEM FOR INJECTING GROUT INTO A BOREHOLE, METHOD OF DEPLOYING A TUBE INTO A BOREHOLE FOR GROUT INJECTION AND LEADER FOR USE IN A GROUT INJECTION SYSTEM

摘要

The system and method to inject grout into a borehole uses a leader comprisingopposite fore and aft portions, a pressure-bearing member between the fore andaft portions, and aleader passage extending from a fore opening at the leader fore portion to anaft opening in theleader aft portion. A tube is attached to the leader and connected to theleader aft opening. Theleader is inserted into the borehole with the fore portion first. An impellingfluid is injected in theborehole downstream of the pressure-bearing member and exteriorly of the tube,resulting inpressure being applied on the pressure-bearing member and the leaderconsequently advancingtowards the borehole bottom end, the leader carrying the tube with it todeploy the tube in theborehole. Upstream fluid located in the borehole upstream of the pressure-bearing member isevacuated out of the borehole through the leader passage and the tube. Theinjection of the impellingfluid is stopped when the leader reaches a leader target position and grout isthen injected in theborehole, gradually filling the borehole. The impelling fluid is evacuatedfrom the borehole throughthe leader passage and the tube while the grout is injected.