Changsha ENYU Engineering Equipments Co. Ltd.
Changsha ENYU Engineering Equipments Co. Ltd.
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R25/ R27/ R32/ R38 /R51 Self - Drilling Grouting Anchor Bolts For Mining Or Exploration
Introduction of self-driling grouting bolts:
It is very common for underground works to encounter soft surrounding rock, fractured zone and great deformation due to high ground stress. It is difficult for anchor work, especially under the condition that serious hole collapsing occures and extra-long bolt is needed, while it is impossible to solve the problem with ordinary bolt. This self-drilling bolt embodies drilling, grouting and anchoring as a whole and can improve the condition of surrounding rock in course of deformation due to high ground stress.
Function of each parts of self-driling grouting bolts:
1. spherical nut
To transmit the stress of surrounding rock to the palte
2. Anchoring plate
To bear higher stress of urrounding rock
3. Grout stopper
To keep grouting at certain pressure to fully fill the clearance of surrounding rock
4. Anchor body
It has the international standard wave-shape connecting thread and is very easy to be installed with bit, coupling and fasten nut. It can also be cut or connected very freely.
5. Coupling
It can realize the purpose of elongating to the designed depth while drilling
6. Bit
It has strong ability of penetrating, so the anchor can pass through various rock with it
Specification of self-driling grouting bolts:
| Type | R25 | R27 | R32 | R38 | R51 |
| Dia/wall thickness (mm) | 25/5.5 | 27/6.0 | 32/6.0 | 38/7.0 | 51/8.0 |
| Tensile strength (KN) | 180 | 230 | 260 | 380 |
600 |
| Tensile strength (Mpa) | 600 | 600 | 600 | 600 | 600 |
| Weight (kg/m) | 2.5 | 3.0 | 3.6 | 5.2 | 8.0 |
| Drill bit Diameter | 42 | 44 | 51 | 64 | 76 |
| Thread direction | left | ||||
| Standard Length (m) | 3.0, 3.5, 4.0, 4.5 | ||||
| Length error | 2.5% | ||||
| Drill depth | More than 12m | ||||