|
|
|
Hollow Bar Anchor Installation Equipment
|
|
|
|
|
|
 |
|
|
|
|
|
 |
|
|
Drill Rigs |
|
|
|
The preferred method of installation for the Williams / MAI Hollow Bar System is rotary percussion drilling, as this method offers good directional stability and high rates of production. Hand-held drill rigs can be used to install R25 and R32 bars. Hand-held equipment works best when used in conjunction with an air leg or within a slideframe arrangement.
|
|
|
 |
|
|
|
|
|
Rotary Injection Adapters (Grout-Swivel) for Rig Installation |
|
|
RotoJec Shank
 |
|
For simultaneous drilling and grouting installations, a rotary injection adapter is required. The rotary injection adapter or grout-swivel consists of a RotoJec Body and RotoJec Shank. The RotoJec Shank fits within the RotoJec Body and contains grout inlet ports. One end of the shank attaches to the striker bar while the other end attaches to the hollow bar anchor. The RotoJec Body contains an inlet pipe to allow grout to enter into the shank and down the hollow bar. The body remains stationary while the shank spins with the rotary action of the drill. To hold the body into position and prevent spinning with the rotary action of the drill, it is necessary to attach a locator frame from the body to the drifter. Some rock drills, such as a TEI Drill and an Atlas Copco IRIA (Integrated Rotary Injection Adapter) System, offer an integrated grout-swivel to facilitate installation and reduce time-consuming retro fits of traditional top hammer drilling equipment.
Caution should be applied that only water or grout flush be used with the grout-swivel system. Air flush could burn the seals within the RotoJec Body. In all cases, grease should be applied to the grout-swivel system prior to use. |
RotoJec Body |
|
|
|
|
|
|
|
|
|
Rotary Injection System (Grout-Swivel) for Hand-Held Drill Installation |
|
|
|
Combi Body
Combi Shank |
The Combi System is used for hand-held installations of R25 and R32 anchors. As with the rig grout-swivel system, the Combi Grout-Swivel System must also contain a locator frame connection from the body to the drifter to prevent spinning. In all cases, grease the Combi System prior to use. |
|
|
|
|
|
|
|
|
Grout Injection Adapter |
|
|
|
 |
An Injection Adapter connects to the end of the hollow bar and serves as a conduit between the grout line and the hollow bar. Generally this adapter would be used for post-installation grouting following air or water flush drilling. |
|
|
|
|
|
|
|
|
Coupling Box |
|
|
|
 |
A Coupling Box is a machined and case hardened adapter, which is usually located just below the drill hammer and is used to connect the striker bar to the hollow bar. Sizes are available in any striker bar thread type to connect to any Williams / MAI Hollow Bar size. Generally a Coupling Box would be used in place of a grout-swivel during an air flush installation. |
|
|
|
|
|
|
|
|
Drill Bit Adapter Sleeves
|
|
|
|
 |
Adapter Sleeves enable the use of a larger diameter drill bit with a particular bar size than normal to increase the borehole size and achieve higher loads in poor ground conditions. Caution needs to be applied that the use of larger diameter drill bits with smaller diameter hollow bars be restricted to clay/soft ground in order to reduce the risk of torsion buckling in the bar. Sizes available are R25/R32, R32/R38 and R38/R51. |
|
|
|
|
|
|
 |
|
|
|
|
|
|
|
|
 Williams Form Engineering Corp. All rights reserved. |
|
