Self drilling anchor system is mainly used in slope stabilization, tunneling pre-support, foundations with micropiles, it is also widely used in the railway system, metro project etc. It can be installed in sites with weak rocks, loose soil, weathered layer, sand with stone layer and so difficult to create a hole in complex formations. The unconsolidated ground condition favor the self-drilling anchor bolt technique for fast and simple method of installation compared to the traditional method.
1.Self drilling anchor system has two performances: the one is drilling, the other one is grouting. It features a hollow bore for flushing, or simultaneous drilling and grouting.
2.Self drilling anchor system is reliable, efficient and convenient, which makes high piling output possible.
3.We can also make the Hot-Dip Galvanizing Corrosion Protection according to EN ISO1461
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
Anchor Bar
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 |
| Steel grade |
En10083-1 (Alloy structure steel) |
| Compared to carbon steel, alloy structure steel has high anti-corrosion capacity and high mechanical. |
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 |
| T30/11 |
30 |
11 |
446 |
320 |
260 |
3.3 |
Lift or right |
| T30/14 |
30 |
14 |
395 |
260 |
220 |
2.9 |
Lift or right |
| T30/16 |
30 |
16 |
382 |
220 |
180 |
2.7 |
Lift or right |
| T40/16 |
40 |
16 |
879 |
660 |
525 |
7.0 |
Lift or right |
| T40/20 |
40 |
20 |
726 |
539 |
430 |
5.6 |
Lift or right |
| T52/26 |
52 |
26 |
1337 |
929 |
730 |
10.0 |
Lift or right |
| T73/53 |
73 |
53 |
1160 |
1630 |
970 |
12.3 |
Lift or right |
| T73/56 |
73 |
56 |
1094 |
1414 |
785 |
11.1 |
Lift or right |
| T73/45 |
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.
We can produce different sizes, thicknesses, widths and materials according to your requirements
Our company is a steel supplier from China, located in Tianjin City, one of the largest steel producers in China. The company integrates the manufacturing, wholesale, material processing and warehousing of stainless steel, aluminum, copper and carbon steel materials, and has established long-term and stable cooperative relations with many well-known steel plants, such as Tisco, Baosteel, Hongwang, Zhangpu, Liangzhong and Jiugang.
Mainly products cover carbon steel tubes, stainless steel tubes, galvanized steel coil, ppgi steel coil, stainless steel coil, carbon steel coil and carbon steel profiles, gi wire, hollow anchor bar, section steel, steel rebar etc. Our company is equipped with plasma cutting machine, coil flattening equipment, laser cutting machine, 8K mirror, frosted wire drawing, filming and titanium plating equipment, which can flatten, split, shear, oil mill wire drawing, and roll oil film wire drawing on stainless steel materials, 8K mirror, titanium and other processing.
In addition, the company's characteristic business: zero-cutting, rounding, square cutting, special-shaped cutting, castings, forgings, product thicknesses up to 150mm, various special materials and specifications can be customized to steel mills.
Companies adhering to the "efficient, win-win" business philosophy, continue to provide customers with professional, quality products and value-added services, continuous progress and learning to meet customer needs. Now the company has entered the period of rapid development of global trade, looking forward to more cooperation.
Accept inspection from a third party designated/paid by the buyer, such as SGS, BV.
Recognized by customers in Malaysia, Indonesia, Singapore, the Philippines, Australia, Peru and the United Kingdom. We have ISO9001/18001, CE certificates.
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 and Transportation
The packaging is packaged in tarpaulins and wooden boxes to ensure that it will not rust and corrode in the process of encountering water.
Q1:Can you send samples?
A:Of course, we can provide customers with free samples and express shipping service to all over of the world.
Q2:What product information do I need to provide?
A:Please kindly provide the grade, width, thickness, surface treatment requirement should you have and quantities you need to purchase.
Q3:It's my first time to import steel products, can you help me with it?
A:Sure,we have agent to arrange the shipment, we will do it together with you.
Q4:What ports of shipment are there?
A:Under normal circumstances, we ship from Shanghai, Tianjin, Qingdao, Ningbo ports, you can specify other ports according to your needs.
Q5:What about product prices information?
A:Prices various according to periodic price changes of raw materials.
Q6:What is your terms of payment ?
A:Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shipment or based on BL copy or LC at sight.
Q7:Do you provide custom made Products service?
A: Yes,if you have your own design , we can produce according to your specification and drawing.
Q8:What are the certifications for your products?
A:We have ISO 9001, MTC, third parties' inspections are all available such SGS, BV ect.
Q9:How long does your delivery time take?
A:In general, our delivery time is within 7-15 days, and may be longer if the quantity is extremely large or special circumstances occur.
Q10: How many countries you already exported to?
A:We have exported to America, Canada, Brazil, Chile, Colombia, Russia, Ukraine, Thailand, Myanmar, Vietnam, India, Kenya, Ghana,somalia and other African countries.Our export experience is rich, we familiar with different market demands, can help customers avoid a lot of trouble.
Q11:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.
Q12: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 and customers can appoint third parties to inspect the products before loading too.
Q13:How to pack the products?
A: Standard export sea-worthy packaging, the inner layer has a waterproof paper outer layer with iron packaging and is fixed with a fumigation wooden pallet. It can effectively protect products from corrosion and various climate changes during ocean transportation.
Q14:What is your working time?
A:In general, When you first contacted us, our online service time is Beijing time: 8:00-22:00, after 22:00, we will reply to your inquiry in the coming working day. Business in progress, we will be online 24 hours for you.
If you are interested in our products, you can contact me at any time and look forward to our cooperation!
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