In all kinds of underground projects, there are complex geological conditions such as weak surrounding rock, fault fracture zone, high ground stress and large deformation, which bring great difficulties to the construction of rock anchors, especially in the case of serious hole collapse and the need for extra-long bolts, the common bolts are powerless. The self-drilling anchor rod integrates the functions of drilling, grouting and anchoring, and can improve the surrounding rock very well in the tunnel advanced support, various slope treatment, high ground stress and large deformation and other disease treatment projects, so as to achieve the ideal support effect.
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PRODUCT PARAMETERS
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Type
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Outer Dia(mm)
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Inner Dia(mm)
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thickness(mm)
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Ultimate(KN) load
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Yield Load(KN)
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Weight(Kg/m)
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R25N
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25
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14
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5.5
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200
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150
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2.3
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R32L
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32
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21.5
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5.25
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210
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1600
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2.8
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|||
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R32N
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32
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16
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8
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360
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280
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3.4
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R32S
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32
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16
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8
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360
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280
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4.1
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R38
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38
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17/19/22
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10.5/9.5/8
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450/400/350
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550/500/420
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6.3/5.9/5.2
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R51
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51
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29/33/35
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11/9/8
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800/660/550
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640/540/450
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9/7.7/7
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T76N
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76
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51
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12.5
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1600
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1200
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15
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T76S
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76
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45
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15.5
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1900
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1500
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19.7
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T103N
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103
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78
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12.5
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2282
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1800
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27.3
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T103S
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103
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51
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26
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3460
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2750
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42
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T30/11
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30
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11
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9.5
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320
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260
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3.1
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T30/14
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30
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14
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8
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260
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220
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2.8
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|||
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T30/16
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30
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15
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7.5
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220
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180
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2.7
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T40/16
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40
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16
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12
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660
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525
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7
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T40/20
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40
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22
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9
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539
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430
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5.6
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T52/26
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52
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26
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13
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929
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730
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10
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T73/53
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73
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53
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10
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1630
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970
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12.3
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T73/56
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73
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56
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8.5
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1414
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785
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11
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T73/45
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72
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45
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14
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1630
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1180
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17.8
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T130/60
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130
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60
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35
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7940
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5250
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75
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Features of self-drilling anchor rod:
1) There is a bit with strong penetration force in front of the anchor rod, which can easily penetrate all kinds of rocks under the action of general rock drilling machinery.
2) The anchor rod has continuous international standard wavy thread, which can be used as drill pipe and drill bit to complete drilling and anchor hole.
3) The anchor rod body used as drill pipe does not need to be pulled out, and the hollow can be used as a grouting channel for grouting from inside to outside.
4) High-efficiency grout stop plug enables the grouting to maintain a strong grouting pressure, fully fill the gap, fix the broken rock mass, and high-strength backing plate and nut can evenly transfer the stress of the deep surrounding rock to the surrounding rock, so as to achieve the purpose of mutual support between the surrounding rock and the bolt.
5) The high-strength coupling sleeve processed by mechanical power cutting technology makes the self-drilling anchor rod have the characteristics of lengthening while drilling, making it suitable for a narrow construction space, and realizing the design idea of strengthening surrounding rock with extra-long anchor rod.
6) Due to the three-in-one function of the anchor rod, it can form the anchor hole and ensure the anchoring and grouting effect without special techniques such as casing wall protection and pre-grouting when it is constructed under various surrounding rock conditions.
