Self-drilling Grouting Bolt
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 occurs 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 the course of deformation due to high ground stress.

1, spheriacal nut: To transmit the stress of surrounding rock to the aaaplate. 

2, Archoring plate: To bear higher stress of surrounding rock. 

3, Grout stopper: To keep grounting at certain pressure to fully fill the aaaclearance of surrounding rock.

4, Anchor body: It has the international standard wave-shape connecting aaathread and is very easy to be installed with bit, coupling and fasten aaanut. It can also be cut or connected very freely.

5, Coupling: It can realize the purpose of elongating to the designed aaadepth while drilling. 

6, Bit: It has strong ability of penetrating, so the anchor can pass aaathrough various rock with it.

Technical Parameters:

Type EY25 EY27 EY32 EY38 EY51
 Dia./wall thickness(mm) 25/5.5 27/6.0 32/6.0 38/7 51/8.0
 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/right
 Standard Length(m)  3.0, 3.5,  4.0, 4.5 
 Length error 2.5%
 Drill depth More than 12m

Specifications:

 

Name Specifications
Anchor bolt

 

EY25
EY32
EY38
EY51
 Carbide Cross Bits (mm)

 

R25/Dia.42
R32/Dia. 51
R38/Dia. 64
R51/Dia.76
 Carbide button bits (mm)

 

R25/Dia.45
R32/Dia. 48
R38
R51/Dia.76
 Coupling (mm)

 

R25/Dia. 35

R32/Dia. 41
R38/Dia. 49
 R51
 Grout stopper (mm)

 

R25/Dia. 60
R32/Dia. 70
R38/Dia. 28
R51
 Plate (mm*mm*mm)

 

150*150*8
150*150*8
200*200*10
200*200*10
 Nut (mm)

 

R25/W30/L30
R32/W46/L40
R38/W56/L40
R51
 Steel shank & Drill cover

 

R25-R25
R25-R32
R38
R51
 Grounting Joint

 

R28-R25
R28-R32
R38/Dia. 28 
R51

 

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