Rock Bolt installation involves a complex process of drilling into rock, inserting a steel bar, and filling the void with grout. These steel bars are then connected to the structure or fastened to a horizontal whaler, in the case of an earth retention system this whaler bar combination provides lateral support. This process is used as an uplift restraint system, earth retention system, or a variety of other applications.
A rock bolt is used in tunnels or rock cuts. It transfers load from the unstable exterior to the confined (and much stronger) interior of the rock mass. Rock bolts are almost always installed in a pattern, the design of which depends on the rock quality designation and the type of excavation.There are many types of rock bolts, including self drilling rock bolt, expansion shell rock bolt, friction rock bolt and fiberglass rock bolt, etc. Every kind of rock bolt has its own method to finish installation.Here is the installation instruction of Sinorock expansion shell rock bolt:
1. Drilling and cleaning the hole. In order to have a straight and accurate hole, please use cross-cut drill bit.
2. Putting the anchor bar which has installed expansion shell into the bottom of the hole.
3. Giving prestressing force to the Self drilling anchor bolt and making sure the expansion shell fully opened by using specialized tools reach the design requirement.
2013年6月21日星期五
2013年6月5日星期三
How to remove rock bolts
Concrete anchors are available in a wide variety of styles. The majority of concrete rock bolts remove easily and often come with removal instructions. There is one type of concrete Rock Bolt that is not meant to be removed, but can be removed with the proper tools. Wedge anchors or expansion bolts lock into the concrete and are difficult, if not impossible to remove. Special concrete anchor extractors have been designed that allow you to removed broken or damaged expansion rock bolts.
1. Put on your hearing protection and safety glasses.
2. Select a socket from the socket set that matches the size of the hex nut tightened to the expansion bolt and place the socket onto the 3/8-inch ratchet.
3. Place the socket onto the expansion bolt hex nut and turn the ratchet handle counterclockwise to loosen the hex nut.
4. Remove the hex nut from the threads of the expansion rock bolt supplier.
5. Secure the expansion self drilling anchor bolt into the chuck of the hammer drill. Refer to the operating manual for the hammer drill to determine the proper procedure for securing the expansion bolt extractor.
6. Fill the hand-pressurized water tank with water and pump the handle of the water tank to pressurize the water.
7. Slide the expansion rock bolt extractor over the expansion bolt and press the trigger of the hammer drill to start drilling around the expansion bolt.
8. Spray water onto the expansion rock bolt extractor as you drill around the concrete anchor.
9. Pull the hammer drill toward you to remove the expansion rock bolt extractor from the concrete.
10. Remove the loose expansion rock bolt from the concrete.
11. Wipe the area around the expansion rock bolt with clean rags to clean the surface of the concrete.
1. Put on your hearing protection and safety glasses.
2. Select a socket from the socket set that matches the size of the hex nut tightened to the expansion bolt and place the socket onto the 3/8-inch ratchet.
3. Place the socket onto the expansion bolt hex nut and turn the ratchet handle counterclockwise to loosen the hex nut.
4. Remove the hex nut from the threads of the expansion rock bolt supplier.
5. Secure the expansion self drilling anchor bolt into the chuck of the hammer drill. Refer to the operating manual for the hammer drill to determine the proper procedure for securing the expansion bolt extractor.
6. Fill the hand-pressurized water tank with water and pump the handle of the water tank to pressurize the water.
7. Slide the expansion rock bolt extractor over the expansion bolt and press the trigger of the hammer drill to start drilling around the expansion bolt.
8. Spray water onto the expansion rock bolt extractor as you drill around the concrete anchor.
9. Pull the hammer drill toward you to remove the expansion rock bolt extractor from the concrete.
10. Remove the loose expansion rock bolt from the concrete.
11. Wipe the area around the expansion rock bolt with clean rags to clean the surface of the concrete.
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