Carbon Steel Screw Thread Anchor Bolt for Tunnel Engineering

 Product DescriptionHollow anchor bar means a rod that transfers the structures or geotechnical load to a stable rock formations, anchor bolt consists of bar, drill bit, coupling, plate, grouting stopper and nut. Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It's irreplaceable in narrow construction environment. Hollow anchor bar is made of seamless tube with high strength.Features of Hollow Grouting Anchor Bar:• Fits standard Boomer, ROC and Mustang rigs.• Particularly suitable for difficult ground conditions.• A high rate of installation since drilling, placing and grouting can be performed in one single operation.• Self drilling system eliminates the requirement for a cased borehole.• Installation with simultaneous drilling and grouting possible.• Easy installation in all directions, also upwards.• Suitable for working in limited space, height and in areas of difficult access.• Simple post grouting system.• Hot-dipped galvanizing for corrosion protectionAdvantages and Characteristics :1.No casings required, because anchor bars can be drilled into loose soils without needing casings to support the boreholes.2.Fast drilling and installation, because drilling, installation and grouting are in a single operation.3.Both rope threads and trapezoid threads are robust and ideal for rotary-percussive drilling and ensuring a high level of bond with the borehole gout.4.The hollow core not only serves for flushing during drilling, but also for grouting afterdrilling.5.Continuous threads ensure the bars can be cut and coupled at any point, or extended.6.Different anchor bits are available for different ground conditions.7.Duplex anti-crossion prosess ,hot-dip galvanized and epoxy coating system.Product Parameters  B7X1 Domestic Hollow Injection BarBARDIAMETERAVERAGEINNERDIAMETERMINIMUMNET AREATHROUGH THREADSMINIMUMULTIMATESTRENGTHMINIMUMYIELDSTRENGTHNOMINALWEIGHTPARTNUMBER32 mm(1-1/4")0.787"(20.0 mm)0.556 in²(359 mm²)58.4 kips(260 kN)47.2 kips(210 kN)2.1 lbs/ft(3.1 kg/m)B7X1-032N32S mm(1-1/4")0.626"(15.9 mm)0.776 in²(501 mm²)81.5 kips(363 kN)66.0 kips(294 kN)2.7 lbs/ft(4.0 kg/m)B7X1-032S38 mm(1-1/2")0.830"(21.1 mm)1.067 in²(688 mm²)112 kips(498 kN)90.7 kips(404 kN)3.76 lbs/ft(5.6 kg/m)B7X1-038N51 mm(2")1.187"(30.1 mm)1.795 in²(1158 mm²)188 kips(837 kN)152 kips(677 kN)6.26 lbs/ft(9.3 kg/m)B7X1-051N76 mm(3")1.890"(48.0 mm)3.880 in²(2503 mm²)407 kips(1811 kN)329 kips(1466 kN)13.79 lbs/ft(20.5 kg/m)B7X1-076NStructural PropertiesYIELDSTRESSULTIMATESTRESSMINIMUMELONGATION85 KSI(586 MPa)105 KSI(724 MPa)15%B7Y1 Non-Domestic Hollow Injection BarBAR DESIGNATION& OUTERDIAMETERAVERAGEINNERDIAMETERMINIMUMNET AREATHROUGH THREADSMINIMUMULTIMATESTRENGTHMINIMUMYIELDSTRENGTHNOMINALWEIGHTPARTNUMBERT30S - 30 mm(1.18")11 mm(0.43")0.662 in2(427 mm2)71.9 kips(320 kN)58.5 kips(260 kN)2.42 lbs/ft(3.6 kg/m)B7Y1-030ST40N - 40 mm(1.57")20 mm(0.79")1.046 in2(675 mm2)121 kips(539 kN)96.7 kips(430 kN)4.23 lbs/ft(6.3 kg/m)B7Y1-040NT40S - 40 mm(1.57")16 mm(0.63")1.222 in2(788 mm2)148 kips(660 kN)118 kips(525 kN)4.84 lbs/ft(7.2 kg/m)B7Y1-040ST52N - 52 mm(2.05")24 mm(0.94")1.874 in2(1209 mm2)209 kips(929 kN)164 kips(730 kN)6.92 lbs/ft(10.3 kg/m)B7Y1-052NT64 - 64 mm(2.52")40 mm(1.57")2.4 in2(1548 mm2)261 kips(1160 kN)209 kips(930 kN)8.74 lbs/ft(13 kg/m)B7Y1-064N* T73N - 73 mm(2.87")53 mm(2.08")2.5 in2(1615 mm2)260 kips(1160 kN)218 kips(970 kN)8.9 lbs/ft(13.2 kg/m)B7Y1-073N *T76S - 76 mm(2.99")45 mm(1.77")3.891 in2(2510 mm2)427 kips(1900 kN)337 kips(1500 kN)13.23 lbs/ft(19.7 kg/m)B7Y1-076S* T103N - 103 mm(4.06")78 mm(3.07")4.87 in2(3140 mm2)510 kips(2270 kN)405 kips(1800 kN)17.0 lbs/ft(25.3 kg/m)B7Y1-103N ** T130N - 130 mm(5.12")60 mm(2.36")16.2 in2(10452 mm2)1785 kips(7940 kN)1180 kips(5250 kN)50.4 lbs/ft(78 kg/m)B7Y1-130N *Detailed Photos   Company ProfileShandong Shanshui Special steel pipe Co.,LTD. Our company was founded in 2014, The headquarters is located in 14th floor, Rongfu Center, Huangshan Road,Liaocheng ,Shandong Province,China.We specialized in the research and development,production,sales and application promotion of seamless steel pipe. We can provide customer-required Standard,Specification,Material,Application of Carbon steel tube,Alloy steel tube and their machined products etc.    We have ten years of industry experience, the annual output of the factory is 250,000 tons, non-standard steel tube, super thick wall steel tube, alloy steel tube, super long steel tube, fixed size steel tube are our production advantages. We have perfect production equipment: · 50 production workshop        · 76 production workshop        · 90 production workshop · 60 Cold Rolling Resources Units(OD10-159mm,THK2-20mm)Our factory can provide customers with product testing and steel tube machining services,"OWN PRODUCTION &SALES" production mode, flexible to meet customer needs,