With continuous R or T thread, the bar can be connected by the coupling.
Features:
1) It is made of high-strength steel by rolling, and the material conforms to GB/T 3077 "alloy structural steel";
2) The R-type hollow bar is produced with a left-handed wave thread, which uses a large pitch standard thread. The thread shape conforms to ISO 10208 "rock drilling tool - left-handed wave thread" and ISO 1720 standard, and can be combined with a corresponding nut, coupling. , drill bit, adapter, etc.
3) The T-type hollow bar is produced with a left-handed large pitch trapezoidal thread, and it can be assembled with nut ,coupling, drill bit, adapter, etc.
4) Surface treatment requirements such as galvanizing, epoxy and double anti-corrosion can be selected according to the conditions of use;
5) The length is usually 3m, 4m, 6m;
6) If the customer has special requirements for the diameter, length, thread or surface treatment of the rod, it can also be customized.
Applications:
It can be used as a drill pipe when drilling, and can be used as a grouting pipe during grouting. It can be used as a reinforcing rib after installation.
Advantage:
1) High strength and quality material is selected, the hollow bar has high strength and plasticity;
2) The hollow structure is used to make it more resistant to bending and shearing than solid bar of the same cross-sectional area;
3) The inner hole of the hollow bar can be used as a grouting passage;
4) The bar is processed by rolling to process the continuous thread, which can be used for any cutting or be connected by coupling for a longer length, and can be used in a small space.
5) The full-length continuous thread can have better adhesion to the cement layer, it can be used as strong support for tunnels and rock slopes.
Drill bits, nut, plate and coupler, etc.will be accembled accordingly.
| Type |
Outer Dia.(mm) |
Inner Dia.(mm) |
Ultimate Load(KN) |
Yield Load(KN) |
Weight(kg/m) |
| R25N |
25 |
14 |
200 |
150 |
2.3 |
| R32L |
32 |
22 |
260 |
200 |
2.8 |
| R32N |
32 |
21 |
280 |
230 |
2.9 |
| R32/18.5 |
32 |
18.5 |
280 |
230 |
3.4 |
| R32S |
32 |
17 |
360 |
280 |
3.5 |
| R38N |
38 |
21 |
500 |
400 |
4.8 |
| R38/19 |
38 |
19 |
500 |
400 |
5.5 |
| R51NL |
51 |
36 |
550 |
450 |
6.3 |
| R51N |
51 |
33 |
800 |
630 |
8.0 |
| T76N |
76 |
51 |
1600 |
1200 |
16.5 |
| T76S |
76 |
45 |
1900 |
1500 |
19.7 |
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