Product Parameters
| Product Name |
Hollow bolts / Hollow anchor / Self drill anchor / Grouting drill anchor bar / Rock anchor |
| Standards |
GB1499.2-2007 GB 50086-2015 TB/T 3209-2008 |
| Grades |
Carbon |
45#, sae1045, aisi1045 |
| |
Alloy |
40Cr, JIS SCr440, ASTM 5140, ISO 41Cr4 |
| Certificate |
We are SGS approved enterprise, we issue MTC and be responsible for the quality. |
| Outside diameter |
25mm, 25.4mm, 28mm, 28.3mm, 30mm, 32mm, 38mm, 40mm, 51mm, 76mm or as per required |
| Thread standard |
ISO 10208 / ISO1720 |
| Tolerance for OD |
+0mm/-0.2mm |
| Length |
1.5m, 2m, 3m, 4m, 5m, 6m, or as per clients request |
| Surface treatment |
Black / oiled /galvanized or as per required. |
| Heat treatment |
Annealed |
| Test |
Yield strength test, Tensile strength Test, Chemical composition |
| Accessories |
normal head, Alloy bit, expanding head, hex-nut, slurry seal, connector, plate |
| Packing |
Wrapped by anti-water plastic clothes, each bundle two hoisting belts |
| Application |
pre-support, radial support, slope stabilization, foundation support , soil nail, retaining wall, etc. |
| Shipping term |
In bulk / FCL / LCL, partial shipment allowed |
| Shipping port |
Qingdao, or Tianjin port |
| Third party inspection |
Acceptable |
| Trade term |
CIF, CFR, FOB, EXW |
| Delivery time |
Within 7 days for stocks supply. |
| Paying term |
30%TT + 70% TT against copy of documents, or 30%TT + 70% LC. |
Product Description
The 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.
Application
Railway System
Metro Project
Slope Stabilization
Hydroelectric Station
Infrastructure
Mining
| Hollow Rock Anchor Bars Accessories |
1. 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 |
| Size |
O.D(mm) |
I.D(mm) |
Ultimate Load(KN) |
Yield Load(KN) |
Weight(kg/M) |
| R25N-14 |
25.0 |
14.0 |
200 |
150 |
2.3 |
| R32L-22 |
32.0 |
22.0 |
210 |
160 |
2.8 |
| R32N-21 |
32.0 |
21.0 |
280 |
230 |
2.9 |
| R32N-18.5 |
32.0 |
18.5 |
280 |
230 |
3.4 |
| R32S-17.5 |
32.0 |
17.5 |
360 |
280 |
3.5 |
| R32S-15 |
32.0 |
15 |
360 |
280 |
4.1 |
| R38N-21 |
38.0 |
21.0 |
500 |
400 |
4.8 |
| R38N-19 |
38.0 |
19.0 |
500 |
400 |
5.5 |
| R51L-38 |
51.0 |
38.0 |
550 |
450 |
6.0 |
| R51L-36 |
51.0 |
36.0 |
550 |
450 |
7.6 |
| R51N-36 |
51.0 |
36.0 |
800 |
630 |
7.6 |
| R51N-33 |
51.0 |
33.0 |
800 |
630 |
8.4 |
| Steel grade |
Acc. to EN10083-1 |
| Thread direction |
Left hand |
| Thread standard |
ISO 10208 / ISO1720 |
| Characteristics & features of hollow grouting anchor rod |
1. 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 process
1) 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 joint.
5) Grouting: start the machine for grouting. If pressure grouting is required to improve the surrounding rock structure, just wait until the pointer on the pressure gauge rises to the design pressure.
Certifications
Why Choose Us
Δ More than 10years experience in the steel industry ensuring best ability supplying you best solutions on goods design, processing, transportation, and cost control.
Δ Abundant ready stocks and sizes ensuring you the shortest delivery time.
Δ Quality assured.One MTC sheet issued by us will be presented together with other shipment documents. We accept any quality claim raised within one year.
Δ Customized service help you avoid complex follow-up work, our professional processing on goods itself find you one-stop buying here.
FAQ
We look forward to your inquiry!! Thanks for watching!
*What is your paying terms?
Our usual paying terms are 30%TT as deposit and balance paid after seeing copy of bill of loading. For clients cooperated for more than one year, we accept 20% prepay. Beside we do business also under D/P and LC terms.
*How long is your delivery time?
For the goods we have in stocks, we deliver the goods within 5days. If it is a production order with volume not above 200tons, the delivery time will usually be within 20days after sealing contract. And the delivery time shall be slightly longer for order volume above 200tons.
*Can you do partial shipment?
We will follow client request to do partial shipment or not. Partial shipment is not a problem for us.
*What is your Minimum Order Quantity?
For goods in stocks we supply starting with one piece. Shall it is a production order, the MOQ is 3tons. Please be noted price based on MOQ will be slight higher than FCL condition due to higher unit cost.
*Before cooperation we want a sample for inspecting of quality, is that okay?
We can provide a free sample for you shall sample value not above 30USD, you only need to pay the express charge. For a sample valued more than 30USD, the express charge and just one half of sample value is on the account of you, and we afford the other half.
*What is the mode of transportation?
Ocean freight is the most important shipping way, and we choose the ship line based on soonest and earliest shipping time, rather than cheaper cost; or we follow clients' instruction if there is one. Also railways will be chosen by us when it is more convenient. For samples and papers, the transportation will be by air.
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