Prestressed hollow grouting anchor up a shell, an overview rose shell hollow grouting anchor steel is mainly used in geological conditions in good rock, a permanent system support, ahead of the advance guard; particular period in hard rock, rock level bedding, mud jointed open folder or groundwater development occasions, through the rapid formation of the steel bolt supporting force to control the stability of surrounding rock. Control can be prestressed anchor and rock deformation. 2, the product consists of: Steel rose bolt grouting hollow shell of steel rose by a shell head, hollow grouting anchor body, grouting stopper, pallets, nuts composition. (See figure). Hollow grouting anchor body: for the whole hollow threaded bolt. Pallets, nuts: prestressed external locking fasteners and delivery components. Pallet with a vent. Exhaust pipe: plastic pipe through the vent fixed on the pallet on the pallet, placed on one end of the other end of drill hole depth outside. According hollow anchor bolt installation method used in conjunction with. Grouting stopper: rubber shop help materials to improve the grouting effect. 3, product specifications and technical parameters: Model (up shell) mechanical index rod bolt ultimate tensile bolt hole diameter not less than the diameter threaded rod Standard length direction of the maximum drilling depth kn mm mm L mm YD25A 180 25 42 2 . 5/3/3.5/4/4.5/5/5.5/6/8/10 - YD25B 150 25 42 YD25C 120 25 42 YD27A 240 27 42 YD27B 200 27 42 YD27C 180 27 42 YD29A 290 29 46 YD29B 210 29 46 YD32A 290 32 75 YD32B 250 32 75 YD38A 440 38 75 YD38B 420 38 75 YD50Z 640 50 110 YD50B 580 50 110 * bolt mechanical index and technical parameters can be changed according to user needs 4, construction specifications: (1) Drilling: The drilling machine in the formation drilling and precise to enable vertical aperture should be used cross drill bit. (2) In the blow hole, it will install three rose shell anchor bolt into the bore head, tail pipe with solder tail connection with the drilling machine, start drilling machine, punching through its force to turn up in the tunnel at the bottom of the shell anchor head full up open (generally rock drill it stops). (3) lifted the rock drill and solder tail, installation grouting stopper, pallets, nuts and grouting pipe. According to a predetermined prestress lock nut. (4) Grouting: prestressed grouting is completed in a timely manner. Quality is permanent support grouting anchor durability of the key. When the bolt down installation, the hollow bolt rod of slurry into the road, plastic pipe for the exhaust duct grouting, slurry from the bottom up shell anchor head a slurry, and gradually filled borehole road. Slurry flow from the plastic tube and the pressure maintained at about 30S stop grouting. 5, the product advantages: (1) having a through rose-shaped shell and rock, into inflationary pressure quickly after installation bolt anchoring force supporting the formation, and control rock deformation; prestressed bolt can control around rock deformation, improved anchoring effect. (2) lever can be installed in any direction 360 degrees and grouting, and the construction process is simple, grouting and reliable, so bolt with permanent support and durability. (3) By prestressing the anchor grout in the zero stress or grout cracking does not appear to prevent the bolt corrosion under the long-term work. (4) through the installation of an exhaust duct, with rose shell anchors, the construction can be realized after grouting, the grouting pressure, grouting full uniform, reinforcement effect.