Hollow bar anchors  are a threaded drill rod with sacrificial bits that are advanced to the desired depth. The hollow bar anchors are grouted through the center of the drill string and out the end of the sacrificial bit. 

This process creates a cement column that is reinforced in the center with the steel drill string. Hollow bar anchors can be used as tie backs, tie downs, rock anchors, soil nails  and micro piles. Their versatility and compact equipment meet the needs of many challenging applications.

There are three types of drill bits used on hollow bars. The highly versatile carbide cross cut bits, carbide button bits for hard rock and stepped clay bits for cohesive clay. The type of drill bit and size is based on the soil type and the desired capacities. Larger boreholes provide higher load carrying capacities and more grout cover. The grout cover protects the anchor bar from corrosion but galvanization is also available. Depending on the soil type, a 3” diameter bit with grout pressure can create a 6” to 8” diameter grout column. Production rates are higher when using hollow bar systems as compared to traditional drilled anchors. This is especially true when drilling at sites with low headroom or where there is the risk of bore hole collapse.

At Sinorock, we're dedicated to helping your production run smoothly. Superior quality and excellent service are the keys to oursuccess. 

Our many years of expertise, our unique manufacturing process, and our commitment to complete Customer Satisfaction isyour assurance of the finest craftsmanship and meticulous personal service.At Sinorock, we are dedicated to meeting our customers'needs. Our knowledgeable, experienced sales staff is available to answer any questions you might have and ensure yoursatisfaction.

We are successfully meeting the needs of geotechnical anchorage industries as a renowned manufacturer, exporter & trader of hollow bar.Our Self drilling hollow bar systems are made using high grade material and available in varied grades.We pack the product in standard quality corrugated boxes to save it from any damage during transportation.