Self drilling bar system

In today’s society, there are huge projects meant for civil construction and engineering. The infrastructure used in our daily lives all has been created because of civil construction and engineering. The roads, railways, stadiums, harbors, schools and other buildings constructed all are a contribution of civil engineering.So the number of hollow bars is increasing nowadays.
One of the early civil engineering applications of Sinorock prestressing technology was for
anchoring structures into the ground and for stabilizing slopes using ground anchors. Since
then, Sinorock self drilling anchor bars has evolved significantly and our latest
milestone – the anchor bar – has benefitted a wide range of customers. Soil nails,
rock bolts and micropiles complete the range.
Sinorock hollow anchor bar in a wide range of sizes and grades. Sinorock’s program of hollow anchor bar includes several grades of austenitic stainless steel as well as duplex stainless steel.Sinorock provide many sizes of hollow anchor bar for you.  

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Steel hollow bar

Since self-drilling hollow anchor bar construction is strong technical work, each working
procedure must be meticulous operation,otherwise it will effect the whole piece of anchor
rod construction quality because of a process of negligence .Therefore, the operator must be
higher technical quality, a clear division of responsibilities.
The self drilling hollow anchor bar combines drill bolt and hollow rod together and it is
widely used in various engineering conditions including weak rock,loose soil,decayed rocks
and unconsolidable earth mass and so on.
The facilitate of Sinorock steel hollow bar is so easy that it’s the key elements for our agents to choose our anchoring products.We allows customization of self drilling anchor,so the length of rod body can be cut and connected as our customer’s specific requirements.Bonded deep into the rocks by the means of adopting cementitious grout, Sinorock hollow steel bar transfers necessary forces to resist walls from overturning, water tanks from uplift, towers from uplift, dams from rotating and other naturally or phenomenally occurring powers applied to configuration.

Sinorock hollow steel bar are designed and forged to the latest standards as set forth in the Post-Tensioning Institute’s Recommendations for Pre-stressed Rock and Sinorock self drilling anchor. Anchor capacity is a function of the steel capacity as well as the geotechnical holding capacity.


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Hollow bar advantages

With rapid development of economy, hydraulic engineering is more and more. Most of them exist in remote mountainous area with large drop and complicated geological condition, when encountering landslide, debris flow and other natural hazards, they will probably be destroyed. So, as an efficient anchoring method, self drilling hollow bar is widely used in many engineering, such as advance support, radial support, slope reinforcement, subgrade consolidation, river embankment reinforcement, etc.
For the anchoring technology which has drilling operation requirements, drilling is usually the most critical process and directly affect the bearing capacity of the hollow bar . Drilling in the loose stratum or the stratum with groundwater, there is severe hole collapse phenomenon so that it’s necessary to add the casing to match. The use of casing can improve drilling progress, but have adverse effect on the bond between the mortar and the hole wall and meanwhile increase the difficulty and cost of construction.

While hollow bar anchor applies very well for pebbles and boulders stratum. The disturbance part of surrounding rocks can be effectively reinforced through grouting and then the anchorage area will be enlarged. If water leakage appears during the drilling process, the method of blowing cement powder with a high-pressure wind to the hole can form a temporary wall around the drill hole so as to reduce the hole collapse phenomenon.

Hollow bar anchor is suitable for broken rock, loose soil and conditions which are difficult to drill holes, such as fracture zones, decayed rock, gravel, sandy gravel, backfill ground. In order to have optimal result, drill bits can be used differently according to the rock conditions.  

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Hollow anchor bolt

Hollow anchor bolt can simplify drilling, grouting and anchoring processes. It is easy and quick to operate and the construction quality is dependable. The whole length of hollow anchor bolt can be anchoring sufficiently. It’ll immediately provide support resistance after excavation, effectively inhibiting the loosening or deformation of surrounding rocks, which can avoid or reduce roof caving accidents or other diseases during the construction.

In particular, the hollow anchor bar is provided with sufficient and uniform thickness of protective layer, which fully guarantees the durability of the hollow anchor bolt. It is especially suitable for supporting and strengthening the complex strata and broken rocks.  

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Grouting hollow bar

We all know that hollow bars play a critical role in an underground mine by keeping miners safe from falling rock. Good hollow bars are vital to any mining company because if a rock bolt fails, an open section underground could not only collapse and cause fatalities, but also cost a fortune to clean out again. As a reliable and rigorous bolt manufacturer, we can promise that all Sinorock products and services are subject to strict quality control systems and programs that are consistent with the certification requirements of ISO 9001:2008.And the rock bolts produced by the Sinorock are stronger, and create less waste material.

Sinorock is also a bolt manufacturer with perfect service system that can provide our clients an unparalleled level of pre-sale and after-sale service including: a 7*24 hours professional service, after clients receive the products, we will email them to make an after-sales research about the products. Once they have some problems, we will reply in 8 hours. If necessary, we will send experts to help clients solve the problems. Sinorock devotes itself to providing one-stop service for every client and seek long-term development. We'll keep improving the quality of products and service as well as management for better serving clients.
Since the total length of grouting hollow anchor bars with safe and reliable, simple construction and low cost, they are widely used in slope engineering. When hollow bars reinforced slope, depending on the interaction between surrounding rock mass and rock bolt transmitting rod tension, making themselves get reinforced in geotechnical engineering, limiting the deformation, and improving stress state of the mechanical parameters of rock mass and to maintain stability. Due to the hollow bars load transfer mechanism is very complicated, so far still assumes that the lateral resistance distribution patterns in rock bolts design is uniform distribution. But a large number of measured results show that it is unreasonable according to uniform distribution pattern calculated. In recent years, with the development of computer technology, numerical simulation methods are widely used in geotechnical engineering, adopting double spring hollow bar element, the establishment of a model of Highway slope was simulated excavation process of the hollow bars reinforcement effect, the effective anchorage length of rock bolts and sliding surfaces, resulting in:

1.In slope anchorage engineering, hollow bars exist an effective length, when the rock bolts length is greater than the effective length, continuing to increase the length does not improve the safety factor of slope; When the hollow bars length is less than effective length, the relationship between slope safety factor and anchor length conforms to the linear features.

2. With the increase of hollow bars length, the potential sliding surface of slope gradually moves inside the slope, the failure mode from shallow sliding into deep sliding; when it comes to an effective anchorage length of hollow bar length, sliding surface of slope position mutation, quickly close to slope surface.

3. The distribution of each layer of hollow bar axial force along the length is uneven, rock bolt axis force generally performs the law for middle big and on both sides small; When there is external disturbance and degradation of rock mass slope, bolt axial force value of slope bottom is maximum, therefore, you should not arbitrarily reduce the bottom bolt length in practical engineering. For a permanent bolting slope with using load, we can appropriately extend bottom bolt length when necessary.  

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Hollow bar in concrete

Basically, injection hollow bars are installed so that it will serve as a strength support for the new foundation. It is also useful in underpinning the existing ones. As a matter of fact, it is also essential for tension, soil nails, and tiebacks. If you are going to drill tough soil layers or extremely hard rock, then micropiles are the perfect solution. For a more foundation support,injection hollow bars are installed in the spaces with low overhead clearance. It makes the structure more stabilized.
Injection hollow bars are a perfect alternative to concrete caissons
If the conventional concrete caissons are impossible to use then micropiles can be a perfect alternative. There are various instances wherein it is impossible to use concrete caissons such as soils with relatively high blow counts, soil obstruction, unstable construction areas like sinkholes, bedrock drilling, caves, underground rivers, and the like.
Hollow bar micropiles are reinforced in small diameter piles that are installed about 200 feet depths. The good thing about micropiles is that it is not affected by trash and cobbles. It has the ability to drill through tough soils and automatically embed in the load bearing rock layers. Micropiles are easy to install and as a matter of fact it can be
installed in a limited area even with the use of small equipment. The characteristics of micropiles make it suitable to any types of foundation repair. The micropiles installation process starts with drilling through the use of a highly specialized drilling rig. The process is then followed by column grouting, which is performed through threaded rod and carbide bit.
Good hollow bar anchors are vital to any mining company because if a self drilling anchor fails, an open section underground could not only collapse and cause fatalities, but also cost a fortune to clean out again.The hollow bar anchor of Sinorock is recognized by most of engineers due to its excellent quality, delivery performance, innovative management and perfect service system.It begins with parts carefully matched with our supply partner and inspected to meet to our customer’s application specification. For more than 4 years,Sinorock has focused on creating self drilling hollow bar products that help people build safer and stronger homes and buildings. Considered a leader in hollow bar systems research, testing and innovation, Sinorock is one of the largest hollow bar suppliers in the world.  

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Qualitative SGS hollow bars

Sinorock - We are a trusted name engaged in dealing qualitative SGS hollow bars as per client’s specific requirements. These are available in various grades, thickness, length and weight.
On our site you can find products and technical assistance, request samples or volume quotes, and order items from our comprehensive stock. If you prefer personal assistance please contact us. Our attention to quality, service and timely deliveries make us the best choice for your hollow bars needs.
From site development and excavation to construction, coordinating utilities and site restoration there are many challenges faced on these complex projects.The reinforcement of expansive soil cutting slope has been a difficulty for the construction industry. And Sinorock carries a wide range of self drilling hollow bars to fit a variety of construction projects. You can choose among various lengths, load ratings and materials to find the perfect self drilling bars to safely complete your project.
Providing a ultimate load range from 261kN to 7909kN. All Sinorock self drilling hollow bar utilise a small diameter greased filled high density polyethylene sheathing, allowing for a greater number of individual strands to be contained in a given drill hole size.
Sinorock self drilling bars are used for rock reinforcement in Mining and Tunneling. Self drilling hollow bars limit the loosening of blocks out of the rock mass and shear displacements. Furthermore, the frictional force between individual rock layers is increased. Self drilling hollow bars with a variable anchor length enable pre-tensioning and thus an active force transmission.  

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