2016年08月24日

Some datas of soil nail


Soil and rock nailing is a relatively new construction technique first utilized in Europe to stabilize and construct tunnels. In North America, it is quickly becoming a popular method of soil and rock retention, slope stabilization, and shoring. Soil nailing provides project owners and DOTs economic benefits and a rapid means of retaining wall and retention support system construction. Two very different projects proved the advantages of soil nailing over conventional retaining wall construction for DOTs in Kentucky and Iowa.
The size, length and spacing of soil nails are determined by structural engineers based on a soil evaluation at the building site. When all nails have been driven in the wall of the first excavation, workers apply a shotcrete facing that’s usually between 3 in. and 6 in. thick. Drainage matting material and steel mesh are sometimes incorporated into this spay-applied wall. Promoting good drainage helps to prevent hydrostatic pressure from building up behind the wall. The steel mesh is included to increase the strength of the concrete.

When the first "dig" complete, another excavation is made and the same nail and shotcrete installation is repeated. This sequence gets the retaining wall built in safe, manageable increments, without the risk or expense of making a single full-depth excavation and erecting a concrete block or poured-concrete wall. In the case mentioned above, the soil nail and shotcrete retaining wall simply stabilized the foundation hole while permanent reinforced concrete basement walls were formed and poured. But these walls can also serve as primary, stand-alone retaining walls in other applications.  

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2016年08月16日

Applications for Soil Nailing

Soil nailing is the technique of strengthening the soil to give it more stability. The process involves hammering steelnailing for soil stabilization by Sinorock into the soil, hence the name "soil nailing". This process of soil nailing provides a resisting force against slope failures. The process is faster than other similar methods.

The procedure starts by drilling into the soil where the "nail" steel bar is going to be placed. After the drilling is completed, the exact depth must be provided by a geotechnical engineer, then the nail is inserted into the drilled hole. After that is completed, it is grouted into the soil to create a structure similar to a gravity wall.
Applications for Soil Nailing

Soil nailing can be used to:

Stabilize slopes
Prevent landslides
Steepen an existing slope
Provide earth retention for excavations
Repair retaining walls  

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2016年08月13日

Soil nail ideal for projects

Soil nail system , an ideal anchor system for underground construction, is an environmental solution for metro tunnel projects. Especially in weak conditions, soil nail has better reinforcement effect over other anchoring systems. Soil nail system can change the mechanical property of surrounding rocks, enhance self-supporting capacity, reduce deformation of surrounding rocks and then keep tunnel’s stability.
For 5 years Sinorock continued to supply quality soil nail products around the country and around the world. Further developments in soil nail products led Sinorock to become the leader in providing such products to the Heavy construction industry for use in mass concrete projects such as Dams, Locks, bridges, water and sewage treatment plants. Sinorock products have been used on such landmark projects as Hoover and Shasta Dams in the west, most of the Lock and Dam projects along the Ohio River in the East, The Pentagon, and Michigan's Mackinac Bridge to name a few.  

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2016年08月09日

Soil nail:widely used

1. The application of soil nail .
Generally speaking, soil nail is suitable for foundation excavation support and slope stabilization in artificial soil, clayey soil and weak consolidated sand. The depth of excavation should be less than 16 meters, and the depth can be increased when combining with pre-stressed anchor bolt. Soil nail should be not used in silty sand layer with rich water, sandy gravel stratum and mucky soil.
2. The exploration of project.
As for soil nail support, the previous exploration is necessary for the security of project. It includes underground pipelines and rainfall.
3. The design and monitoring.
Accurate and reasonable design is the premise of ensuring construction quality, which influences the security, construction period and investment of project. So the design should bebased on geological survey report, analyze soil property, combining theoretical analysis with project experience. During the process of construction, design parameters should be adjusted according to site conditions. Monitoring work should be also done, it includes horizontal displacement, sedimentation, soil nail stress and soil pressure, etc.

Self drilling soil nail is a kind of supporting technology in geotechnical engineering. It drills surrounding rocks with a certain distance, direction and depth, then it is put into the drill hole and at last, grouting and fixing are carried on. Soil nail has the effect of binding, combining and reinforcing surrounding rocks. It helps to improve rocks’ self-intensity and self-stability, lighten self-gravity, ensure safety and stability of projects.At present, soil nail has been widely used in foundation pit, underground anti-floating, tunnel, slope support, water conservancy and hydropower, highway bridge, etc. Its quality will directly influence security of whole project.
The function mechanism of soil nail:Soil nail and soil body can combine together and form compound body, which will promote slope stability and carrying capacity, improve ductility, avoid collapse and benefit for construction security.


  

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2016年08月08日

Hydroelectric with soil nail

Soil nail is widely used in railway construction, Tunneling, mining, hydropower station, dam, bridge base, foundation reinforcement of buildings. Furthermore, it is workable for the repair of ground subsidence, hole collapse, crack, landslip and other geological disaster. Sinorock self drilling soil nails have been used in many famous hydroelectric projects, such as Nepal Rasuwagadhi Hydroelectric Station project, Nepal Upper Tamakoshi Hydroelectric Project and Ecuador TOPO Hydro-power Station, etc.,and have received a great reputation.
Sinorock always insist on safe, efficient, energy-saving and environmental friendly principles, and we will provide one-stop service, integral solution and quality guarantee.
Especially in the sand gravel stratum, using the traditional method of anchoring, the low probability of pore formation makes it difficult to grout and anchor lately and also increases construction costs.
At this time, self drilling soil nail shows its superiority, which can adapt to a variety of complex geological conditions and construction environment, particularly in the soft soil and sand gravel stratum.
Five performances about self drilling soil nail.
1.Self drilling soil nails is made of seamless steel pipe,whose surface is processed into thread, which can make it drilling, grouting and anchoring at the same time during the construction process.
2. Self drilling soil nails matches kinds of drill bits with specific properties, applicable to all types of formations.
3. It uses mechanical cutting technology for processing high-strength couplings, which makes self drilling soil nails has extended while drilling. It is able to use a longer self drilling soil nail in a small construction space.
4. As a result of using the self drilling soil nail as a drill rob, there is no need pre-grouting and using a casing.
5. Grouting is convenient and compact, increasing anchoring strength. Easy to use and have a higher construction speed.  

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2016年08月06日

Reinforcing element:Soil nail

Geotechnical engineers design the soil nailing project, taking into account soil compatibility and strength requirements of the grout and shotcrete. The technique, appropriate in many cohesive soils of fragmented rock, is top-down construction.
Sinorock soil nails can be used as reinforcing elements for most applications for Ground Engineering and Civil/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/unconsolidated soils and ground conditions ranging from clay, sand and gravel to inconsistent fills, boulders, rubble and weathered rock. Use of the Sinorock soil nailing system in these conditions makes evident all the benefits and advantages of the system.
Sinorock supplies soil nailing support systems, for all forms of temporary and permanent works, and rapidly installed mini piles which have wide ranging applications.Operating throughout the asia and other parts of worldwide, Sinorock soil nailing support Systems has considerable expertise in geotechnical and structural stabilisation and offers a comprehensive technical support service including advice, design specification and site testing services as well as product installation, if required.  

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