Tianjin Youfa Steel Co., Ltd
Tianjin Youfa Steel Co., Ltd
Home> Products> Hollow Anchor Bar> R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar
R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar
R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar
R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar
R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar
R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar
R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar

R25/R32/R38 Self Drilling Hollow Grouting Anchor Bolt/Bar

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Payment Type:T/T,D/P,L/C
Incoterm:FOB,CIF,EXW,CFR
Transportation:Ocean,Land,Express
Port:Tianjin,Qingdao,Shanghai
Product Attributes

Model No.R25 R32 R38

StandardGb, Astm, Jis, Din

MaterialA53-A369, Q195-Q345, 10#-45#, St35-St52, Cr-Mo Alloy, Mn-V Alloy, Crni Alloy

Section ShapeRound

Place Of OriginChina

ApplicationFluid Pipe, Drill Pipe, Structure Pipe

Production ProcessCold Drawn

CertificationCe, Api

Special TubeApi Pipe

Whether AlloyNon-Alloy

Tolerance±1%

CategorySeamless Steel Pipe

Processing ServiceCutting, Punching, Decoiling, Welding, Bending

Packaging & Delivery
Selling Units : Ton
Package Type : Standard marine packaging, or as required by the customer
Picture Example :

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Full Threaded Steel Self Drilling Anchor Bolt
Hollow Anchor Rod
Product Description

SELF-DRILLING Anchor Bolt
Self drilling anchor system for application in soil nailing, rock bolting, micro-pipling, tunneling, mining and infrastructure.
WHAT IS SELF-DRILLING ANCHOR SYSTEM?
Self drilling anchor system is a type of ground anchor used to provide stability in soil or rock formations. The system typically consists of a Hollow Anchor Bar with a drill bit on one end and a coupling on the other. During installation, the drill bit is used to bore a hole into the ground while simultaneously injecting grout into the hole to fill any voids. The anchor bar is then inserted into the hole and the grout is allowed to set, creating a bond between the anchor and the surrounding ground. This creates a stable foundation that can support a variety of structures and engineering projects. Self drilling anchor systems are commonly used in construction, mining, and tunneling applications.

Hollow anchor bar is the body of a self-drilling anchor, as a hollow steel tube with an outer round thread, hollow anchor has the sacrificial anchor bit connected at one side, plate and nut connected at the other; two Hollow Anchor Bars could be connected together via a coupling, for duties that requiring longer anchors.

Hollow anchor bar

Parameters

Model OD(mm) ID(mm) TS(KN ) YS(KN ) T(mm) National standard
 weight  (kg/m)
Nominal Weight (kg/m)
R25N-14 25 14 200 160 5.5 2.3 2.6
R32N-22 32 22 280 230 5 2.8 3.3
R32N-21 32 21 280 230 5.5 2.9 3.6
R32N-19 32 19 280 230 6.5 3.4 4.1
R32S-18 32 18 360 280 7 3.6 4.3
R32S-15 32 15 360 280 8.5 4 4.9
R38N-21 38 21 500 400 8.5 4.95 6.2
R38N-19 38 19 500 400 9.5 5.5 6.7
R51L-38 51 38 550 450 6.5 6 7.1
R51L-36 51 36 550 450 7.5 7.6 8.0
R51N-36 51 36 800 630 7.5 7.6 8.0
R51N-33 51 33 800 630 9 8.4 9.3
T76N-49 76 49 1600 1200 13.5 16.5 20.8
T76N-45 76 45 1900 1600 15.5 19 23.1
T30-14 30 14 275 220 8 2.9 4.3
T30-11 30 11 320 260 9.5 3.3 4.8
T40-20 40 20 540 425 10 5.6 7.4
T40-16 40 16 660 525 12 7.1 8.3
T52-26 52 26 930 730 13 10 12.5
T73-56 73 56 1035 830 8.5 10.8 13.5
T73-53 73 53 1160 970 10 12 15.5
T73-45 73 45 1600 1270 14 17.5 20.4
T103-78 103 78 2270 1800 12.5 25 27.9
T103-51 103 51 3660 2670 26 44 49.4

Self Drilling Anchor Bolt

Hollow Anchor Bar Hollow Anchor Bolt


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.

Self Drilling Anchor Bolt


Packaging And Transportation

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

Hollow Anchor Bar

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