220/180 KN Left Thread T30/16 Self Drilling Hollow Bar For Ground Engineering

220/180KN Left Thread T30/16 Self Drilling Hollow Bar For Ground Engineering

Hollow Bar System consists of fully threaded steel bar sections, couplers, nuts and drill bits. It can be drilled and grouted into loose or collapsible soil without a casing. The bar sections feature a hollow center that allows for a simultaneous drilling and grouting operation.

Hollow Bar serves as a drill rod. It is fitted with a lost drill bit at the front that can be adapted to different ground conditions. After each single bar section of 1 to 6m, the subsequent bar is coupled to the previously installed section.

During drilling, cement grout is injected into the hollow core of the bar using an injection adapter that is mounted on the drill rig. The cement grout exits at the bottom end through openings in the drill bit. The injected grout initially serves as slurry to stabilize the borehole and ensures the efficient flushing of the drill spoils. Once the grout reached strength it bonds the bar to the ground.

Once the required installation depth has been reached, the hollow bar serves as a steel tendon and can carry out its function as a soil nail, rock bolt or pile upon the grout reaching its required strength.

Anchor bolt

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

 it consistsof rod, drill bit,coupling, plate, grouting stopper and nut. It has been widely used in tunnling,

 mining,slope stabilization, tunneldiseasestreatment and roof supporting of undergroundworks. It is for 

loose ground(clay, sand friable etc.) Hollow anchor rod is made of seamless tube with high strength.

Features of Hollow Grouting Anchor Bolt:

Hollow design, implement the grouting tube function, avoid the mortar loss when the traditional grouting

 tube pulled out.Grouting full, and can achieve the pressure grouting to improve project quality.

Center is good, mortor can wrap the bolt body together, so that it can avoid corrosion to achibe along 

term supporting purposes.

Easy installation, without onsite processing of threads. It can be easily installed an plate, nut.

Selt-Drilling Anchor Bolt Description

It may bodies drilling, grouting and anchoring as a whole.

It has a wide specifications. Diameter:25-130mm.

Qucik and easy construction, high efficiency.

Used invious surrounding rocks.

Anchor Bolt

T-Thread Anchor Bolt Technial Data