Rock Bolt/Hollow Bar Anchor/Self Drilling Bolt for Tunnel/Mining R25/ Steel 40cr/45

  Product Parameters  Product NameHollow bolts / Hollow anchor / Self drill anchor / Grouting drill anchor bar / Rock anchorStandardsGB1499.2-2007 GB 50086-2015 TB/T 3209-2008GradesCarbon45#, sae1045, aisi1045 Alloy40Cr, JIS SCr440, ASTM 5140, ISO 41Cr4CertificateWe are SGS approved enterprise, we issue MTC and be responsible for the quality.Outside diameter25mm, 25.4mm, 28mm, 28.3mm, 30mm, 32mm, 38mm, 40mm, 51mm, 76mm or as per requiredThread standardISO 10208 / ISO1720Tolerance for OD+0mm/-0.2mmLength1.5m, 2m, 3m, 4m, 5m, 6m, or as per clients requestSurface treatmentBlack / oiled /galvanized or as per required.Heat treatmentAnnealedTestYield strength test, Tensile strength Test, Chemical compositionAccessories normal head, Alloy bit, expanding head, hex-nut, slurry seal, connector, platePackingWrapped by anti-water plastic clothes, each bundle two hoisting beltsApplicationpre-support, radial support, slope stabilization, foundation support , soil nail, retaining wall, etc.Shipping termIn bulk / FCL / LCL, partial shipment allowedShipping portQingdao, or Tianjin portThird party inspectionAcceptableTrade termCIF, CFR, FOB, EXWDelivery timeWithin 7 days for stocks supply.Paying term30%TT + 70% TT against copy of documents, or 30%TT + 70% LC.Product DescriptionThe product is composed by hollow anchor bar, anchor nut, anchor plate, anchor coupler, drill bit, and the hollow anchor bars can be cut and lengthened by coupling on request.  Self drilling anchoring system is an advanced system which can ensure the anchoring effect for complex ground conditions. It can be integrated with the functions of drilling, grouting and anchoring.  It can be used in railway system, metro project and infrastructure . As an efficient anchoring method, it's also widely used for pre-support, radial support, slope stabilization, foundation support , soil nail, retaining wall, etc.  ApplicationRailway SystemMetro ProjectSlope StabilizationHydroelectric StationInfrastructureMining  Hollow Rock Anchor Bars Accessories1. Anchor head: the barb on the anchor head can position the anchor rod in the drilled hole, and the rod body is well centered. 2. Anchor bolt body: the most important structure in the assembly, which plays a major role in anchoring and support. 3. Grout stop plug: maintain the grouting pressure during the grouting process, so that the grout can fully fill the gap of surrounding rock. 4. Base plate: bear greater surrounding rock stress. 5. Nut: concentrate the surrounding rock stress on the base plate. Hollow Rock Anchor Mechanical Properties  SizeO.D(mm)I.D(mm)Ultimate Load(KN)Yield Load(KN)Weight(kg/M)R25N-1425.014.02001502.3R32L-2232.022.02101602.8R32N-2132.021.02802302.9R32N-18.532.018.52802303.4R32S-17.532.017.53602803.5R32S-1532.0153602804.1R38N-2138.021.05004004.8R38N-1938.019.05004005.5R51L-3851.038.05504506.0R51L-3651.036.05504507.6R51N-3651.036.08006307.6R51N-3351.033.08006308.4Steel gradeAcc. to EN10083-1Thread directionLeft handThread standardISO 10208 / ISO1720  Characteristics & features of hollow grouting anchor rod1. Combine the functions of anchor rod and grouting pipe into one. It is a grouting pipe during grouting, and becomes an anchor rod without pulling out after grouting. The hollow design enables the anchor rod to realize the function of the grouting pipe, and avoids the mortar loss caused by the pulling out of the grouting pipe in the traditional construction process. 3. The grouting is full, and the pressure grouting can be realized, which improves the project quality. 4 due to the role of various accessories, the rod body is well centered. The mortar can wrap the whole length of the bolt body, avoiding the risk of corrosion and achieving the purpose of long-term support. 5. It is easy to install. It is not necessary to process threads on site. It is convenient to install base plates and nuts. 6. Safe, reliable, and time saving. Self drilling system eliminates the requirement for a cased borehole.7. Simple installation & operation.8. Choice of drill bits for different ground conditions.9. Grouting works synchronize with drilling or after drilling. Grout can fill fractures effectively. 10. Anchor bars can be cut and lengthened on request, applying to narrow spaces.11. It provides higher bonding stress than smooth steel pipe depending on continuous wave thread.It is the only anchoring system in China that has completely solved many problems of traditional anchoring support at present, combined with the supporting special grouting pump and grouting technology.Product installation process1) Drilling: drill and clear the hole with ordinary rock drill. 2) Insert anchor rod: insert the hollow grouting anchor rod with installed anchor head into the hole, and the barb on the anchor head will immediately hang the anchor rod. 3) Install the grout plug, backing plate and nut. 4) Connect the grouting machine: connect the end of the anchor rod with the selected grouting machine through the quick grouting join