2016年07月26日

Qualified hollow threaded bar

In order to make sure qualified products can be provided, all products should be produced according to Sinorock quality control requirement.
Test report from our factory lab will be provided for every batch of products. If you have special requirement, we can also help to provide test report from third party testing organizarion, like SGS.
CE&SGS are the exclusive licensees to supply and install hollow thread bar systems in European. Sinorock have been leaders in the design, manufacture and supply of hollow thread bar systems since 2011 and are ideal for use in engineering.
Our high quality self drilling hollow anchor bars also work to stabilise foundations and support structures for excavation, making worksites safer. We work closely with geotechnical engineers to assist with project design and selection of anchor type after consideration
Whether you need self driling hollow anchor bars installed, a retaining wall built, or geotechnical matting installed on a hard-to-reach cliff face,Sinorock can help. Head to our services page to learn more about the products and services we offer.
  

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2016年07月23日

Hollow bar:passive support

Rock reinforcement and support have been applied since the early days of underground excavation.

Since then, ground control systems have been extended from a solely passive support (e.g. timbering) to a combination of active reinforcing elements such as anchors and hollow bars with different types of support elements. Nowadays, a broad range of versatile innovative methods and systems is available, allowing efficient and safe underground excavation works. Generally speaking,the development of efficient self-drilling rock reinforcement systems in underground mining and tunnelling came along with the major developments and improvements in the field of rock drilling technology which took place in the 70’s and 80’s of the last century.

Sinorock hollow bar anchor can be used as reinforcing elements for most applications for Ground Engineering and Civi Construction as well as mining principals in various ground conditions. Particularly considering the economic point of view the system is used in a variety of loose or unconsolidated soils and ground conditions ranging from clay, sand and gravel to inconsistent fills, boulders, rubble and weathered rock.
Engineering and machining companies can make significant cost savings by using Sinorock's hollow bar with pre-defined outside and inside diameters. This saves tooling costs, operating time and eliminates a complete operation, when compared to the use of solid bar, and also substantially reduces waste material.
We offer premium quality of hollow bar and other products.Our supreme varieties of products are highly appreciated for anti corrosion, durability, resistance to varied temperature and high compressive strength.
With its technical expertise Sinorock can prove the case that final component performance and properties are unaffected by using hollow bar rather than solid bar.   

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2016年07月19日

Hollow bar sizes

Sinorock self drilling hollow anchor bolt system have become an important tool for the geotechnical engineer. Their safe and reliable use in both permanent and temporary applications is accepted throughout the world.

The self-drilling hollow anchor bolt system facilitates your work to a great extent, as it is capable of performing drilling, anchoring and injecting procedures all at once. The self-drilling anchor bolt has a hollow interior, a threaded exterior and a drill bit that is used for drilling. The hollow interior of the self-drilling anchor bolt allows air and water freely pass through the drilling process, flushing the particles. It also facilitates immediate injection following completion of the drilling process. Self-drilling anchor bolts present a unique bolting solution for fractured or hard rock formations as well as unstable ground conditions (such as gravel, soft, clayey and non-homogeneous soil).

For hollow bar , the steel we commonly used for R25 is Q345. The Steel we commonly used for other sizes like R32/R38/R51/T30/T40/T76 is 40Cr which European name is 40Cr4. The steel we commonly used for coupler is 40Cr which European name is 40Cr4.

The steel we commonly used for forged nut is 45# which European name is ZK45. The steel we commonly used for casting nut is Q235 which European name is SJ235.

The steel we commonly used for R25/R32/R38/R51/T76/T111 plate is Q235 which European name is SJ235. The steel we commonly used for T30/T40/T52/T73/T103/T127/T130 plate is 45# which European name is ZK45.

The steel we commonly used for casting drill bit is 42CrMo. The steel we commonly used for tungsten carbide drill bit is 40Cr. The steel we commonly used for centralizer is QT500.

All the above steels are commonly used in the production of our self drilling anchor bolt products, if you have any specific requirement, we can also provide customized products for you.
  

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2016年07月13日

Lightweight tool :Hollow bar

Hollow bar is a lightweight tool designed to transfer home anchoring to the ground. It is easy to install and it consists of cables and rods that are connected to a bearing plate thus used for stabilization of steep slopes. Initially, it was used in the United States to support excavation systems. The tool is often used to transmit a tensile load to the ground. It is installed in grout-filled drill holes.
Sinorock invents, manufactures, or distributes some of the most innovative hollow bar products available to the construction and mining industries within China and Globally.With manufacturing capabilities across China, supported by global production where needed, our robust supply chain has been engineered to get you the right product, at the right time, for the right price.
Sinorock's reinforcement systems are useful acnhoring tools.In the tunnel construction, Sinorock Self Drilling Hollow Bolt can be used as stabilization of tunnel portals, fore-poling, face stabilization, spilling, root piling and radial systematic anchoring.
  

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2016年07月06日

Hollow anchor bar :srtong

Hollow anchor bar has following advantages:
1. High efficiency: Self-drilling hollow anchor bar combines drilling, grouting and anchoring together, several processes can be done at the same time, which is time-saving and high-efficient.
2. Suitable for stratum which difficult to drill hole: When encountering loose and broken surrounding rocks, it is difficult to drill hole and easy to collapse; while self drilling rock bolt can overcome this situation. After drilling hole, anchor bar still stays in the hole, which ignores collapse, saves time and reduce construction difficulties.
3. High adaptability: There is whole thread on the surface of self drilling hollow anchor bar , it can be cut at any position. So it is suitable for different construction conditions.
4. High anchoring force: The thread of self drilling hollow anchor bar divides into R-thread and T-thread. They can both connect with coupling tightly and have good bonding effect with grouting slurry.
5. Good anchoring effect: When grouting, slurry is from the bottom to orifice, the effect is full and dense, grouting quality is good.
6. Simple to construct: Compared with common rock bolt, self drilling hollow anchor bar has decreased the processes of pulling out of hole, installing anchor bar and inserting grouting pipes, which is quick and simple.
Sinorock - We have experienced an enormous change and development over the past years. Thanks to reliable quality, competitive prices, professional and valuable services, we now have grown to be a leading supplier of hollow anchor bar in China. As a modern corporation, we operate strictly in compliance with the ISO9001 quality management system, and some of our products have passed European CE certification. We always adhere to the principle of “ Sincerity-oriented, Credibility   

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