1 Product Overview: Combined hollow grouting anchor is in general developed on the basis of hollow grouting anchor modular series, which fully take into account ordinary hollow grouting anchor bolts and other types combined advantages and disadvantages, completely solve the hollow bolt and grouting exhaust problem, has broad application prospects. (2) Implementation of the standards: TB / T 3209-2008 "hollow bolt technical conditions" 3. Products: mainly by the nut, plate, grouting stopper, hollow bolt rod, grouting channel, a slurry channels, the exhaust passage , connection section, solid anchor rod, anchor head and anchor hole components. 4 Product Features: composition hollow grouting anchor together existing and various types of hollow grouting anchor bolt combined advantages and has improved significantly, with the following characteristics: 1. Completely solved up to the grouting and Grouting under an exhaust problem, the use of a wide range; 2. anchor combination of two parts of the same type hollow grouting anchor body, without on-site processing thread, easy connection, can be arbitrarily take a long, convenient on-site construction operations; 3. part of a portfolio full use of hollow bolt body, as far as possible to shorten the length of the exhaust pipe, exhaust function improved significantly, increasing the diameter grouting, grouting anchoring effect is excellent, no grouting blind; 4 using materials such as hollow assemblage bolt connection, no strength of weak areas and give full play hollow bolt length and other strong features; 5. solve the self-feeding (drilling) anchor grouting exhaust problem. 5 Scope of application: Suitable for railways, highways, tunnels, mines, water conservancy, slope, dams, bridge foundation, Jianghai lake river, building high-rise building foundation and reinforcement works. 6 Performance Index (Reinforced): Specification Nominal diameter mm Yield strength MPa Ultimate Strength MPa yield strength kN maximum force kN Elongation% φ20 20 335 455 ≥ 105 ≥ 142 ≥ 17 φ22 20 400 540 ≥ 126 ≥ 170 ≥ 16 φ22 22 335 455 ≥ 127 ≥ 172 ≥ 17 φ25 25 335 455 ≥ 164 ≥ 223 ≥ 17 7. performance indicators (hollow bolt body): Specification Nominal diameter mm Nominal thickness mm Yield strength MPa Ultimate Strength MPa yield strength kN Max Force kN Elongation% φ20 30 4 325 490 ≥ 106 ≥ 160 ≥ 21 φ22 30 5 325 490 ≥ 127 ≥ 192 ≥ 21 φ22 30 5 325 490 ≥ 127 ≥ 192 ≥ 21 φ25 32 6 325 490 ≥ 159 ≥ 240 ≥ 21