2017年02月17日

Strong hollow threaded rod

When Sinorock was founded in 2011, the goal was simple: to provide distributors in the world with
hollow anchor bar along with outstanding service at a competitive price. Over time,Sinorock grew to become a dominant player in the hollow anchor bar market nationwide.
In order to Bright our business area and enlarge our products and have the best sales serve to
establish mutual benefit cooperation relations with the hollow threaded rod customers all of the
world.

As an efficient anchoring measurement,hollow anchor bolt was one of the most vital role in the civil
construction as well as geological engineerings,in which the core is to excavate the surrounding wall
of the engineerings with the utilization of rock anchor ,moreover,anchoring tech helps well in
strengthening underground structure by appling the mutual effectiveness between soils or rock mass to
prevent disasters like landslide,sliding,deformation and so on and guarantee the safety of the
operation.

Sinorock is the professional hollow anchor bolt manufacturer for the construction and renovation
industries.Sinorock is a proud partner of the highest quality brands in hollow anchor bolt
manufacturing.We are involved in manufacturing and supplying with the help of huge experience of our
experts for qualitative range of anchor bolt. These anchor bolts are made mostly used in
mining,tunneling,under ground working environment, these hollow anchor bolts are machine friendly
which reduces the time of installation.  

Posted by seo2@sinorockco.com at 17:38Comments(0)TrackBack(0)

2017年02月06日

Hollow bar for concrete

With the increasing requirements of the railway tunnel safety, people are paying more and more attention to the higher geological anchoring technology. Traditional technology may have some shortcomings during the construction under broken rock, loose soil and conditions which are difficult to drill holes, such as fracture zones, decayed rock, gravel, sandy gravel, backfill ground. While self drilling anchor system consists of hollow anchor bar, coupler, nut, plate and sacrificial drill bit. Hollow anchor bar can be used as a drill rod, grouting pipe and source of anchoring force, which makes self drilling anchor system combine drilling, grouting and anchoring functions together.
Different type of drill bits can be used according to different geological conditions so as to achieve optimal result. The application of hollow anchor bar in the railway tunnels will largely save the construction cost and speed up the construction progress.
During construction process of mountain slope, rock face will be damaged after excavation or blast, it may have security problem of small block, so self drilling hollow anchor bar support is always be adopted.

1. When mountain slope fills soil and sweeps away loose rock, blast will be carried out if necessary.
At the same time, safety measures should be prepared well.

2. Positioning. Based on design scheme and geological condition of soil layer, theodolite, digital level and steel tap often are used to confirm self drilling hollow anchor bar’s elevation and separation distance. Then hole site will be determined and marks should be made. Allowable deviation between self drilling anchor’s holes should less than 15mm.

3. Drilling. Drilling machine should be used to form holes, which should be operated according to operating instruction. While drilling, installing anchor bolt to avoid collapse. Error of inclination and horizontal angles should be controlled in 1° and hole deviation rate should be less than 1/100.
During drilling, self drilling hollow anchor bar’s distortion and bend should be avoided.

4. Grouting. Proportion of water and cement paste should be debugged according to actual conditions.
Strength grade of cement should be not less than 30MP. Grouting technology quality requirements

should be confirmed according to trail of self drilling hollow anchor bar. Slurry returns from the bottom of hole until fresh slurry overflows orifice. Once cement face falls back, concrete supplement should be carried out twice in 30 minutes to ensure slurry is full.

5. Installing steel mesh and surface concrete construction.

6. Maintenance. After surface concrete construction, water injection should be done in time: 3 times in a day and no less than 3 days.

Except construction according to standard, quality inspection should be reflected in every link.  

Posted by seo2@sinorockco.com at 18:16Comments(0)TrackBack(0)

2017年01月20日

Hollow bar for civil

Sinorock now manufactures and supplies a complete range of hollow bar products and technical services to the related industries,such as the civil and tunnelling industries.Sinorock’s manufacturing and supply capability includes:self drilling hollow bar, Duplex coating hollow bar system,Stainless self drilling hollow bar system,ect.These products are available in different range. Widely used in soil erosion, slope engineering, mining,
construction, tunnel, large cave supporting and restoration of engineering structure.
The necessity for self drilling hollow bars is increasing in today’s world. They are used in everything that you can imagine.The amount of self drilling hollow bars that is in use each day is a gigantic number and the thought of one company manufacturing all of these self drilling ground anchors is an impossibility. Not only do multiple self drilling hollow bar manufacturers take on the responsibility of supplying many different contractors and construction workers with self drilling hollow anchor bars every day but they also do custom fabrication as well.

All Sinorock self drilling ground anchor systems are equipped with state-of-the-art Taralog computers which provide readings of drilling and concreting parameters.Sinorock self drilling hollow anchor bar systems are built and designed in compliance with the standard ISO, and as a result, we offer superior in-house expertise in self drilling hollow anchor
bar testing (both static and dynamic). This is carried out in the earliest possible stages of the project to enable the client and Sinorock designers to adjust and refine self drilling hollow anchor bar construction pro-actively, rather than re-actively, later in the project.

  

Posted by seo2@sinorockco.com at 16:10Comments(0)TrackBack(0)

2017年01月16日

Purchase self-drilling anchor

What should we concern when purchasing self-drilling anchor ?
Experienced buyers may find there is a difference in the model types of self-drilling anchor among all suppliers.
Naming methods
Atlas MAI (now belongs to Orica) self-drilling anchors are identified by the combination of alphabets & numbers.
For instance,
R32N
R means the rope thread.
32 is the outer diameter of hollow bar.
N represents attributes of tensile strength. The other two are L (less) and S (strengthen).

MAI SDA Specifications
MAI SDA Specifications
Dywidag DSI names the hollow drill hollow bars as the format:
THREAD TYPE-DIAMETER-ULTIMATE LOAD
For example, R32-280, is equal to MAI’s R32N.
DSI Drill Rod SDA Specifications
DSI Drill Rod SDA Specifications
Ischebeck Titan and Williams Form’s IBO drill hollow bars are named by diameters.
Their thread forms are also unique.

Williams’ Unique Thread Form self drilling anchor
Technical documents can be downloaded at their official sites.
Williams Form Drill Rod Specifications
Williams Form Drill Rod Specifications
How much is self-drilling anchor bar?
It depends on length, strength, and weight.
Of course, quantity and size affect the end price.
Contact Sinorock to inquire latest price.
What is IBO self-drilling anchor?
SDA is an anchoring system can be used in tunneling industry and ground engineering for safer and faster production.
Sometimes it is known as IBO, drill injection anchor, self drilled hollow bar and so on.
It can be used as rock bolt, micropile or soil nail.
How much does self-drilling hollow bar cost per pound?
The anchor bar is not normally sold by the pound at hardware stores, and industrial applications tend to go by the ton.
Self-drilling anchor is not raw material, processing charges occupy 1/3 of the cost.
Onton masters the skills and technical ability to produce final hollow bars with excellent capacity, able to meet and ensure performances, in compliance with the EN 14199, EN 14490 and US ASTM F432, A615.
Does the threaded anchor comply with my requirements?
All of Sinorock hollow bar anchors fulfill the requirements of design following the European or American Standards.
Don’t worry about the new anchor bolts can’t match with the former couplers. All is based on drawing in standards.
Moreover, Sinorock provides free, customized samples.
Next time when you look for good quality self-drilling anchors, try to ask suppliers more questions not only price.
What would you think if a manufacturer doesn’t understand the standard requirements in your area?
In a word, product doesn’t lie.  

Posted by seo2@sinorockco.com at 16:13Comments(0)TrackBack(0)

2016年09月24日

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.  

Posted by seo2@sinorockco.com at 18:16Comments(0)TrackBack(0)

2016年09月22日

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.

  

Posted by seo2@sinorockco.com at 19:00Comments(0)TrackBack(0)

2016年09月19日

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.  

Posted by seo2@sinorockco.com at 16:34Comments(0)TrackBack(0)

2016年09月12日

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.  

Posted by seo2@sinorockco.com at 17:10Comments(0)TrackBack(0)

2016年09月09日

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.  

Posted by seo2@sinorockco.com at 18:56Comments(0)TrackBack(0)

2016年09月07日

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.  

Posted by seo2@sinorockco.com at 13:22Comments(0)TrackBack(0)

2016年09月03日

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.  

Posted by seo2@sinorockco.com at 15:21Comments(0)TrackBack(0)

2016年08月29日

Powerful hollow bar

Hollow bars are useful in many different applications. There are also many different types

of hollow bolts available in many different designs. It might seem a little confusing at

first because there are so many to choose from but in the end all hollow anchor bolts pretty

much have the same function. They are meant to support and anchor whatever structure they

are attached to, to another surface.Hollow bars are used for this reason all over the place

and you be surprised at how often they are used.
Sinorock hollow anchor bar system are fully threaded drill rods with drill bits which will

advance the self-drilling anchor bolt into the required depth. The hollow anchor bar will be

grouted in place, which will create the steel reinforcing of an anchor.Sinorock hollow

anchor bar can be used as tie down anchors, deep foundation, rock anchors, soil nails and

micropiles in lots of difficult applications.Sinorock hollow anchor bar is a valuable and

multi-functional additions to engineers. With the use of Sinorock hollow anchor bar,

production rate is much improved, compared with solid bar anchors. Hole casing system can be

avoided, especially in low headroom.
  

Posted by seo2@sinorockco.com at 15:51Comments(0)TrackBack(0)

2016年08月26日

Sinorock drill hollow bar

Sinorock Self-drilling hollow anchor bar system are fully threaded drill rods with drill bits which will advance the self-drilling anchor bolt into the required depth. The self-drilling hollow anchor bar will be grouted in place, which will create the steel reinforcing of an anchor. Self-drilling anchors can be used as tie down anchors, deep foundation, rock anchors, soil nails and micropiles in lots of difficult applications. Self-drilling anchor is a valuable and multi-functional additions to engineers. With the use of drill hollow bar , production rate is much improved, compared with solid bar anchors. Hole casing system can be avoided, especially in low headroom.
Sinorock self drilling hollow bars are available in various diameters, steel grades and various levels of complexity. The most sophisticated self drilling hollow bars in the Sinorock product range is the anchor bolt with expansion shell at the tip and spherical seating on dished stainless steel plates at the active end. The self drilling hollow bars come together with a suitable grouting cup to facilitate grouting of the stressed bolts. Less complex rock nails for strata control can be supplied as slash cut mild steel bars with black steel plates and hexagonal nuts.
Sinorock make our self drilling hollow anchor bolt products with a high quality alloy, so they are strong and reliable.Sinorock designs, manufactures and supplies self drilling bolts and technical service solutions to the global mining market.Sinorock’s self drilling hollow anchor bolt system has been a great success in the market.
  

Posted by seo2@sinorockco.com at 18:46Comments(0)TrackBack(0)

2016年08月23日

Hollow bar for projects

Sinorock 's self drilling hollow bar systems are in use around the world, securing famous structures, large dams and retaining walls, holding down underpasses and underground structures,stabilising wind turbine towers and preventing landslides.
Sinorock 's self drilling hollow anchor bar is a sort of anchor bolt that makes grouting and anchoring can be done simultaneously,it can also provide anexcellent effect on various kinds of complex conditions,such as soft soils,loose rock,fractured zones and so on.
Self drilling hollow anchor bar come with couplings, different types of bits, centralizers, nuts and anchor plates, and also several accessories for injection.Our range of Self drilling hollow anchor bar has the following threads : R25, R32, R38, R51, T30,T40,T52 and T103, with several inside diameters.
Sinorock is a ISO 9001:2000 accredited hollow bar company that places emphasis on quality work and continuous improvements to its products. A quality management system is in place to ensure that customers receive safe-to-use products and excellent value for their money.
https://tackk.com/qr270d  

Posted by seo2@sinorockco.com at 17:30Comments(0)TrackBack(0)

2016年08月12日

R&T thread hollow bar

For R thread products and T thread products, the thread shape is different.Moreover, in construction T thread hollow bar has better adhesive force with cement. The common length of self drilling anchor bolt is 3m/4m/5m/6m, while we can do as customer requires.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 QT500 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.
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.
Sinorock has established a series of strict quality control system which has been adopted in the whole manufacturing process.Each accessory of hollow threaded bar system will be detected strictly in our factory laborary to warrant all of the hollow threaded bars delivered to clients are qualified and safe.
https://hollowbars.pressbooks.com/part/selecting-self-drilling-anchor-bar-can-greatly-simplify-the-process-of-anchor-construction/  

Posted by seo2@sinorockco.com at 17:27Comments(0)TrackBack(0)

2016年08月05日

Hollow bar saving project time

Sinorock stands out from other self-drilling hollow bar manufacturers rapidly these years. We are a professional self-drilling hollow bolt manufacturer, which has the ISO 9000 quality certification and CE certification. It's mainly used in the mineral exploration, tunneling and slope stabilization project.
In comparison with other hollow bar manufacturers, many customers speak highly of our products and service. Now our customers are distributed in many countries including India, Pakistan, Nepal, Malaysia, etc. In the future, we will continue do our best help customers finishing the projects safely and efficiently.
Sinorock hollow anchor bar system enables drilling and grouting in one operation, making much saving in jobsite and project time.

1.The type of hollow anchor bolt: This is the best onstruction program to adjusted to the broken country rock, complex geological conditions and weak surrounding rock, highland stress large deformation, because it avoids the collapse of the construction of the hol affected.

2. The design of hollow anchor bolt, make the bolt to achieve a grouting pipe function, avoiding the mortar loss that traditional mortar grouting construction process caused .

3. Full grouting, grouting pressure can achieve, improve project quality.

4. As the role of the various parts, the center of the rod is very good, the mortar can be full-length bolt body wrap, to avoid the risk of corrosion, and achieve long-term support purposes.

5. Easy installation, no on-site processing thread, you can easily install plate and nut.
Sinorock is an ISO Certified Nationwide Manufacturer of hollow anchor bolt carrying a wide range of Standard Parts as well.Sinorock also has a complete team offering the service from site construction and anchor selection to technical adjustment.
  

Posted by seo2@sinorockco.com at 18:48Comments(0)TrackBack(0)

2016年08月03日

hollow bar for hydropower

Self-drilling hollow anchor bar is being increasingly used for hydropower plant and dam built projects. In terms of the geological condition of this power house, both the sandstone and siltstone are easy to be weathered. Then it’ll be difficult to make holes in the weathered rock. Self-drilling hollow anchor bar has a great advantage over other anchoring systems under the conditions of weathered rock, fracture zones, loose soil and backfill ground. It can effectively solve the problems of hole collapse and drilling holes because of the integration of drilling, grouting and anchoring as a whole. Meanwhile, the application of self-drilling hollow anchor bar can guarantee the construction quality and has great social benefit.
The working mechanism of Self drilling hollow anchor bars
First,Self drilling hollow anchor bars using the way of inserted into the hollow rod and later perfusion grout to anchor from the inside to the outside in the bore of the hollow rod body and outside the port holes of anchor have pulp tampon and pallets, so that it can effectively prevent the slurry spills, to ensure that the rod and the wall of the hole grouting full, so that we can pass along the full length of bolt shear stress and tensile stress, ensure rock anchoring within the range to get reinforcement.If necessary, you can also implement pressure grouting, The slurry was percolating into the fractured rock mass surrounding the rod , so rock anchoring within the range has been further reinforced.
After grouting solidification, available to use torque wrench to tighten the nut, providing 10KN pallet resistance around the bolt ends in the formation and mechanical anchors have similar spherical pressure area, which can be controlled after the initial deformation of rock excavation, to prevent broken rock fall.
Sinorock supplies self-drilling hollow bar , which is a finished steel product used to strengthen concrete for large-scale construction projects. Our products help make bridges, highways, major sports stadiums, high-rise buildings, and other large structures sturdier, safer, and more durable across the vast world’s market.

http://hostedpbxinfo.net/the-amount-of-self-drilling-hollow-bar-is-increasing-day-by-day-in-tunneling-projects/


  

Posted by seo2@sinorockco.com at 16:18Comments(0)TrackBack(0)

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.
  

Posted by seo2@sinorockco.com at 17:38Comments(0)TrackBack(0)

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.   

Posted by seo2@sinorockco.com at 18:00Comments(0)TrackBack(0)

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.
  

Posted by seo2@sinorockco.com at 17:06Comments(0)TrackBack(0)