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Product Description

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Hollow Anchor Rod

Product

I

ntroduction

Hollow anchor 

bar

means a rod that transfers the structures or geotechnical load to a stable rock formations, 

a

nchor bolt

 consists

 

of 

bar

, drill bit,

 

coupling, plate, grouting stopper and nut.

 

Widely used as an efficient anchoring means, in tunnel pre-support, slope, coast, mine, water conservancy projects, building foundation, roadbed reinforcement and geological diseases treatment such as landslip, crack, sink age. It's irreplaceable in narrow construction environment.

 

Hollow anchor 

bar

is made of seamless tube with high strength.

Features of Hollow Grouting Anchor 

Bar

:

• Fits standard Boomer, ROC and Mustang rigs.

• Particularly suitable for difficult ground conditions.

• A high rate of installation since drilling, placing and grouting can be performed in one single operation.

• Self drilling system eliminates the requirement for a cased borehole.

• Installation with simultaneous drilling and grouting possible.

•

 

Easy installation in all directions, also upwards.

• Suitable for working in limited space, height and in areas of difficult access.

• Simple post grouting system.

• Hot-dipped galvanizing for corrosion protection

Advantages and Characteristics

 

:

1.No casings required, because anchor bars can be drilled into loose soils without needing casings to support the boreholes.

2.Fast drilling and installation, because drilling, installation and grouting are in a single operation.

3.Both rope threads and trapezoid threads are robust and ideal for rotary-percussive drilling and ensuring a high level of bond with the borehole gout.

4.The hollow core not only serves for flushing during drilling, but also for grouting after

drilling.

5.Continuous threads ensure the bars can be cut and coupled at any point, or extended.

6.Different anchor bits are available for different ground conditions.

7.Duplex anti-crossion prosess ,hot-dip galvanized and epoxy coating system.

Product Specification

 

Anchor 

Bar

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outside diameter

(mm)

25

32

32

38

51

51

76

76

Internal diameter

(mm)

14

19

16

19

36

33

52

45

Ultimate load

capacity

(KN)

200

280

360

500

550

800

1600

1900

Yield load

capacity

(KN)

150

230

280

400

450

630

1200

1500

Tensile strength,

Rp0.2

(N/mm2)

800

800

800

800

800

800

800

800

Yield strength,

Rp0.2

(N/mm2)

650

650

650

650

650

650

650

650

Weight

 

(Kg/m)

2.3

3.2

3.6

5.5

6.5

8.0

16.0

19.7

Thread type

(left-hand)

ISO

 

10208

ISO

 

1720

MAI

 

T76 Standard

R thread anchor bar or called rock rod, soil nail, which is a kind of threaded hollow bar, bar surface with an rope thread according to ISO 10208 & 1720. It was firstly invented by MAI on 1960S to solve the low construction speed on complicated underground works, nowadays; it is very popular all around the world.

Thread size: R25, R32, R38, R51, T76.

Thread standard: ISO10208, ISO1720 etc.

Anchor Plate

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Dimention

 

(mm)

150*150

200*200

200*200

200*200

200*200

250*250

250*250

250*250

Thickness

 

(mm)

8

10

12

12

20

40

40

40

Hole diameter

 

(mm)

30

35

35

41

60

60

80

80

Weight

 

(KG/PC)

1.4

3

3.7

3.6

8.8

18.5

18

18

Cold deformed with geometry

Anchor Coupling

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Outside diameter

 

(mm)

35

42

42

52

63

63

95

95

Length

 

(mm)

120

145

160or190

180

180

200

200

200

Weight

0.45

The Good Bad and Ugly of Stone Coated Steel Roofing-C
News - Prestressed Steel Wire: Features and Benefits

0.7

0.75

1.4

1.7

1.9

6.4

Additional resources:
Shingle vs. Tile Roofs (2024 Guide)

Want more information on 20mm threaded rebar factory? Feel free to contact us.

6.4

Machined steel coupling middle stop

The hollow bar is continuously threaded, it can be cut and coupled anwhere along its length.
The coupling enables direct end-to-end energy transmission between each bar, reducing losses and ensuring maximum percussive engergy at the drill bit.

 

Drill Bit

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Diameter

 

(mm)

41,51

51,76,90

90,100,110,115,130

130,150,160,180,200

Hardened cross bit

(EX)

Hardened cross bit for loose to medium dense condition with small boulders.

Tungsten cross bit

(EXX)

TC cross bit for soft to medium rock for mations

Hardened button bit

(ES)

Hardened buuton bit for unconsolidated rock with boulders.

Tungsten carbon button bit

(ESS)

Button bit with TC inserts for medium rock for formations.

Hardened arch bit

(EC)

Hardened drill bit with optimized geometry for uncon

 

solid

 

dated soil

with small boulders.

Tungsten carbon arch bit

(ECC)

TC drill bit with optimized geometry for soft to medium rock formations.

Hardened drop center bit

(EY)

Hardened cross bit for loose to medium dense ground conditions

TC drop center bit

(EY)

TC drill bit for soft to medium rock formations.

Casting clay bit

(EW)

Casting clay bit with optimized geometry for very soft to soft caly.

Machined steel bit or Casring steel bit

The sacrificial drill bit is an important part of the self drilling anchoring system.

Choose suitable bits according to different soil type.

 

Anchor Nut

 

R25N

R32N

R32S

R38N

R51L

R51N

T76N

T76S

Key size

 

(mm)

41

46

46

50

75

75

100

100

Length

 

(mm)

135

45

45

55

70

70

80

80

Weight

 

(kg/pc)

0.25

0.35

0.35

0.5

1.55

1.55

3.6

3.6

Machined steel nut or casting steel nut

The hexagonal and spherical nuts are made from high precision steel (40Cr,HRC 20-25) to meet the stringent demands on anchor specifications and the daily uses of reinforcement work.

All nuts exceed the ultimate strength of the rod.

 

T-Thread Anchor 

Rod

 Technial Data

Bar Type

Outside Diameter

(mm)

Inside Diameter

(mm)

Cross section

(mm2)

Ultimate Load

KN

Yield Point

KN

Weight

(kg/m)

Thread Left/

Right Hand

30/11

30

11

446

320

260

3.3

Lift or right

30/14

30

14

395

260

220

2.9

Lift or right

30/16

30

16

382

220

180

2.7

Lift or right

40/16

40

16

879

660

525

7.0

Lift or right

40/20

40

20

726

539

430

5.6

Lift or right

52/26

52

26

1337

929

730

10.0

Lift or right

73/53

73

53

1160

1630

970

12.3

Lift or right

73/56

73

56

1094

1414

785

11.1

Lift or right

73/45

73

45

2265

1630

1180

17.8

Lift or right

T thread anchor bar surface with a trapezoidal thread, this design of connection is much stronger and reliable when compared with rope thread, we supply full sizes from T30 to T103.

Thread size: T30, T40, T52, T73, T103, T127, T130.

Thread standard: ISO10208, ISO1720 etc.

 

Product And Factory Display

 

Product Test

 

Technology Process

The Self Drilling Anchor system is comprised of a hollow threaded anchor bar with a sacrificial drill bit that performs drilling,anchoring and grouting in a single operation. Self drilling anchor system is mainly used in slope stabilization, tunneling pre-support, foundations with micro piles etc projects.

1. Connect the alloy drill and anchor rod one end, on the other end, connect the drill sleeve and shank adapter,

 

then connect the drilling rig or hand-held drill. Then start drilling, fill the cooling water while drilling.( If you want to lengthen the anchor rod, can connect the coupling, and then drilling)

2. Take down the drill, put the stop-grouting plug into the rod, and insert it to the hole,

 

then ready to grout. Special circumstances like surrounding rock grouting tension is over or surrounding rock is too broken, can use anchor agent to seal the hole.

3. Connect quick grouting coupling and anchor rod end, connect other end of grouting machine.

4. Start grouting, when grouting full and reach design value then power off. Grouting pressure according to the design parameters and grouting machine performance determine,

 

Cement/sand reference values is 1:0 ~ 1:1, water/cement reference value is 0.45:1 ~ 0.5:1.

5. Install anchor plate and nuts, and tighten nuts.

Application Scope

During the constructions of underground works, it is very common to encounter soft rock, fractured zone and large deformation due to high ground stress. In the case of serious collapsing, extra-long anchor is needed instead of ordinary one.

Packaging & Shipping

The packaging is packaged in tarpaulins and wooden boxes to ensure that it will not rust and corrode in the process of encountering water.

FAQ

Q:What are the shipping ports?

A:Under normal circumstances, we ship from Tianjin, Qingdao ports, you can choose other ports according to your needs.

Q:About product prices?

A:Prices vary from period to period due to cyclical changes in the price of raw materials.

Q:How long does your delivery time take?

A:In general, our delivery time is within 7-45 days, and may be delayed if the demand is extremely large or special circumstances occur.

Q:Can I go to your factory to visit?
A:Of course, we welcome customers from all over the world to visit our factory.

Q:Does the product have quality inspection before loading?

A:Of course, all our products are strictly tested for quality before packaging, and unqualified products will be destroyed.

for the record, a PSD 350 is overkill for a bag of chips, PSD 250 will do :P

foundation design is a touchy thing. it varies from local to local. i have seen slab on grades that were actually pile supported. that cheap block walled, bar joist building most shops are in are cheaply built. the slabs are often 4-5 inches. usually good enough for small machines.

there is a navy or army manual that is decent for slabs on grade. its the kind of thing that phd thesis are written on.

consider this- if you are installing a machine big enough to crack the floor, then the slab probably has already deflected beyond the point where the machine is level. you probably won;t get a punching shear failure. also consider that the earth is really a layer cake with soft and hard layers interspersed.

so if there is any doubt, contact a professional engineer. what is a run of bad parts gonna cost you? down time? etc... around here, soil borings and recommendations are on the order of $1500-$2000 (you are really paying for the truck time). foundation design and the like is extra. now before you scoff, what did that new machine cost? $150k? its a drop in the bucket.

lots of concrete is not always the best solution either- the micro piles can be used to support things. think house jacking. that aside, here are some numbers to consider-

1000 psf equates to about 7 psi. that is not much. 2000 psf is almost atmospheric pressure.

stiff clay, readily indented by thumb but penetrated only with great effort is about 500-1000 psf allowable bearing
very stiff clay, readily indented by thumbnail, 1000-2000 psf allowable.
sands and gravels are totally different. it all has to do with compaction and measured with a probe, not unlike hardness tests but way bigger.

recommended factor of safety for vibrating machinery is on the order of 5. with sands, its higher.

most places however dont worry about it until there is a problem

If you are looking for more details, kindly visit hot rolled thread bar manufacturers.