Factory Direct Sales High Strength Grouting Bolts Anchor Bolt Self-Drilling Hollow Anchor Bar 1m 2m for Mining Industry R32 R25 R38 R51 T76

• After-sales Service: Support
• Warranty: Support
• Type: Seamless
• Technique: Hot Rolled
• Material: Carbon Steel
• Surface Treatment: Black
• Model NO.: R25 R32 R38 R51 T76
• Usage: Machinery Industry, Construction & Decoration, Special Purpose
• Section Shape: Round
• Tolerance: +0/-0.2mm
• Heat Treatment: Annealed
• Yield Strength: >125kn
• Tensile Strength: >180kn
• Color: Silver, Black, Red, Blue
• Transport Package: Standard Seaworthy Packing
• Specification: Can be customized
• Trademark: YF Steel
• Origin: Tianjin, China
• Production Capacity: 10000 Tons Per Month

Product Description

Product Description

Hollow 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 protection

Advantages 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 after
drilling.
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 Specification

R-Thread Anchor Rod Technial Data

	R25N	R32N	R32S	R38N	R51L	R51N	T76N	T76S
Outside diameter (mm)	25	32	32	38	51	51	76	76
Internal diameter (mm)	14	19	16	19	36	33	52	45
Ultimate load capacity (KN)	200	280	360	500	550	800	1600	1900
Yield load capacity (KN)	150	230	280	400	450	630	1200	1500
Tensile strength, Rp0.2 (N/mm2)	800	800	800	800	800	800	800	800
Yield strength, Rp0.2 (N/mm2)	650	650	650	650	650	650	650	650
Weight (Kg/m)	2.3	3.2	3.6	5.5	6.5	8.0	16.0	19.7
Thread type (left-hand)	ISO 10208				ISO 1720		MAI T76 Standard

R thread anchor bar or called rock rod, soil nail, which is a kind of threaded hollow bar, bar surface with an rope thread according to ISO 10208 & 1720. It was firstly invented by MAI on 1960S to solve the low construction speed on complicated underground works, nowadays; it is very popular all around the world.
Thread size: R25, R32, R38, R51, T76.
Thread standard: ISO10208, ISO1720 etc.
 

T-Thread Anchor Rod Technial Data

Bar Type	Outside Diameter (mm)	Inside Diameter (mm)	Cross section (mm2)	Ultimate Load KN	Yield Point KN	Weight (kg/m)	Thread Left/ Right Hand
30/11	30	11	446	320	260	3.3	Lift or right
30/14	30	14	395	260	220	2.9	Lift or right
30/16	30	16	382	220	180	2.7	Lift or right
40/16	40	16	879	660	525	7.0	Lift or right
40/20	40	20	726	539	430	5.6	Lift or right
52/26	52	26	1337	929	730	10.0	Lift or right
73/53	73	53	1160	1630	970	12.3	Lift or right
73/56	73	56	1094	1414	785	11.1	Lift or right
73/45	73	45	2265	1630	1180	17.8	Lift or right

T thread anchor bar surface with a trapezoidal thread, this design of connection is much stronger and reliable when compared with rope thread, we supply full sizes from T30 to T103.
Thread size: T30, T40, T52, T73, T103, T127, T130.
Thread standard: ISO10208, ISO1720 etc.
 

Anchor Plate

	R25N	R32N	R32S	R38N	R51L	R51N	T76N	T76S
Dimention (mm)	150*150	200*200	200*200	200*200	200*200	250*250	250*250	250*250
Thickness (mm)	8	10	12	12	20	40	40	40
Hole diameter (mm)	30	35	35	41	60	60	80	80
Weight (KG/PC)	1.4	3	3.7	3.6	8.8	18.5	18	18
Cold deformed with geometry

 

Anchor Coupling

	R25N	R32N	R32S	R38N	R51L	R51N	T76N	T76S
Outside diameter (mm)	35	42	42	52	63	63	95	95
Length (mm)	120	145	160or190	180	180	200	200	200
Weight	0.45	0.7	0.75	1.4	1.7	1.9	6.4	6.4
Machined steel coupling middle stop

The hollow bar is continuously threaded, it can be cut and coupled anwhere along its length.
The coupling enables direct end-to-end energy transmission between each bar, reducing losses and ensuring maximum percussive engergy at the drill bit.
 

Drill Bit

	R25N	R32N	R32S	R38N	R51L	R51N	T76N	T76S
Diameter (mm)	41,51	51,76,90		90,100,110,115,130			130,150,160,180,200
Hardened cross bit (EX)	Hardened cross bit for loose to medium dense condition with small boulders.
Tungsten cross bit (EXX)	TC cross bit for soft to medium rock for mations
Hardened button bit (ES)	Hardened buuton bit for unconsolidated rock with boulders.
Tungsten carbon button bit (ESS)	Button bit with TC inserts for medium rock for formations.
Hardened arch bit (EC)	Hardened drill bit with optimized geometry for uncon solid dated soil with small boulders.
Tungsten carbon arch bit (ECC)	TC drill bit with optimized geometry for soft to medium rock formations.
Hardened drop center bit (EY)	Hardened cross bit for loose to medium dense ground conditions
TC drop center bit (EY)	TC drill bit for soft to medium rock formations.
Casting clay bit (EW)	Casting clay bit with optimized geometry for very soft to soft caly.
Machined steel bit or Casring steel bit

The sacrificial drill bit is an important part of the self drilling anchoring system.
Choose suitable bits according to different soil type.
 

Anchor Nut

	R25N	R32N	R32S	R38N	R51L	R51N	T76N	T76S
Key size (mm)	41	46	46	50	75	75	100	100
Length (mm)	135	45	45	55	70	70	80	80
Weight (kg/pc)	0.25	0.35	0.35	0.5	1.55	1.55	3.6	3.6
Machined steel nut or casting steel nut

The hexagonal and spherical nuts are made from high precision steel (40Cr, HRC 20-25) to meet the stringent demands on anchor specifications and the daily uses of reinforcement work.
All nuts exceed the ultimate strength of the rod.
 

Product And Factory Display

 

Product Test

 

Application Scope

During the constructions of underground works, it is very common to encounter soft rock, fractured zone and large deformation due to high ground stress. In the case of serious collapsing, extra-long anchor is needed instead of ordinary one.

Technology Process
The Self Drilling Anchor system is comprised of a hollow threaded anchor bar with a sacrificial drill bit that performs drilling,anchoring and grouting in a single operation. Self drilling anchor system is mainly used in slope stabilization, tunneling pre-support, foundations with micro piles etc projects.

1. Connect the alloy drill and anchor rod one end, on the other end, connect the drill sleeve and shank adapter, then connect the drilling rig or hand-held drill. Then start drilling, fill the cooling water while drilling.( If you want to lengthen the anchor rod, can connect the coupling, and then drilling)
2. Take down the drill, put the stop-grouting plug into the rod, and insert it to the hole, then ready to grout. Special circumstances like surrounding rock grouting tension is over or surrounding rock is too broken, can use anchor agent to seal the hole.
3. Connect quick grouting coupling and anchor rod end, connect other end of grouting machine.
4. Start grouting, when grouting full and reach design value then power off. Grouting pressure according to the design parameters and grouting machine performance determine, Cement/sand reference values is 1:0 ~ 1:1, water/cement reference value is 0.45:1 ~ 0.5:1.
5. Install anchor plate and nuts, and tighten nuts.

Packaging & Shipping

The packaging is packaged in tarpaulins and wooden boxes to ensure that it will not rust and corrode in the process of encountering water.

FAQ

Q:What are the shipping ports?

A:Under normal circumstances, we ship from Tianjin, Qingdao ports, you can choose other ports according to your needs.

Q:About product prices?
A:Prices vary from period to period due to cyclical changes in the price of raw materials.

Q:How long does your delivery time take?
A:In general, our delivery time is within 7-45 days, and may be delayed if the demand is extremely large or special circumstances occur.

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:Does the product have quality inspection before loading?
A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.