Install Water Control Devices of intersecting unknown water structures during normal development drilling, the hole is reamed to the correct size for installing the permanent water control device. 2.2. Packer Identification and Installation Method A packer is a device which is installed into a drill hole for the purpose of controlling water and/or injecting a product into the hole. It works similar to a dynabolts except it is hollow. An inflatable packer has an inflatable section at the inserted end which is remotely inflated by a tube and pump, usually with water to secure it in the hole. They are generally comprised of a packer head which is expanded inside the hole either mechanically or by hand or with a Jumbo or inflated hydraulically. Attached to these are pipes, which are used to inject either grout or polyurethane resin through the packer head. We generally refer to packers as either: ▪ Jumbo Mechanical ▪ Handset Mechanical OR ▪ Inflatable. The Jumbo installed packer has a built in check valve that stops the water inflow. Both other types are usually fitted with a ball valve at the opposite end to the packer head, to shut off the flow of water, and/or inject grout, in to the hole as required. The length of the pipe or conduit attached to the packer head can vary depending on the depth of the required installation, but is typically 2m. The mechanical packers can be used from low to high grouting pressure, generally up to 30 bar; depending on rock conditions, potentially up to 50 bar. You must also ensure that any fittings and valves used are rated appropriately. If water control devices are installed for high pressure water bearing holes and are left ungrouted and unattended, the below sign must be installed on a chain barricade at the access to the site. This will help to prevent possible damage by heavy machinery. 2.2.1. Hand Installed Mechanical Torque Packer Hand installed torque packers are permanently installed water control devices that are used when low pressure water bearing structures are intersected and can be easily stemmed by hand. They consist of a rubber expanding cylinder on one end, a hollow steel pipe with another pipe inside it, which is approximately 2.4m long. It also has a high pressure ball valve with a fitting for Both inflatable and mechanical packers must be matched to the intended drill hole size and to the expected grouting pressure.
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