The new CT-Bolt?is in many ways a typical combination mechanical bolt, installed as a temporary rock support and later grouted to become permanent. But there are important differences. It's quick and easy to install, simple to grout even with varying consistency and the polyethylene sleeve seals the bolt against corrosion. The bolt can be installed manually or fully mechanized with rock-bolters, that have been developed for the CT-Bolt?
Unique hemispherical dome
The CT-Bolt?has a special hemispherical dome at the end which serves both to hold the rock loading on the plate and as a grouting chamber. The grout is pumped into the hemispherical dome and flows through the polyethylene sleeve. At the end of the bolt, the grout flows out of the sleeve and spreads back between the sleeve and the rock (see installation).
After the bolt is grouted, it can take loads along its full length as well as at the bearing plate. The polyethylene sleeve also seals the bolt against corrosion. The buttons on the sleeve transfer the load from the rock to the bolt and center the bolt in the borehole.
The CT-Bolt?is anchored with an expansion shell and is prestressed during installation. The load is maintained because the bearing plate needn't be removed for grouting.
If the area has to be shotcreted before the bolt is grouted, it is possible to attach tubes to the hemispherical dome and the plate, and grout the bolt after shotcreting. Many underground rock stabilization jobs have proved the efficiency and reliability of the CT-Bolt?since its first use. It has been specified on projects such as sub-sea tunnels, road and rail tunnels and underground mines.
The advantages of the CT-Bolt?/P>
Combines the benefits of immediate point anchor support and a post groutable fixture
The polyethylene sleeve seals the bolt against corrosion when grouted
Long term support for fully mechanized or hand installation
本文转自：China Industry News