2016年06月28日

Reinforcing the rock:Soil nail

Soil nail has the functions of convenient, reliable and economical. At the same time, during soil nailing construction, the influence for surrounding environment is little. So, soil nail supporting is widely used in foundation excavation project.
In loose soil and broken rock conditions, advance reinforcement should be carried out, such as grouting and micro pile underpinning.
Soil nail is installed in complicated geological conditions in various construction projects, such as weak surrounding rock, fault fracture zone, high geo-stress, large deformation and other common types of complex geological conditions. These conditions caused great difficulties to anchor shotcrete support construction, especially in severely hole collapse and condition required a longer soil nail, most of normal specification soil nails can not reach the capacity of anchor.
Soil nails work by reinforcing the rock – this means they improve the strength of the rock mass into which they are installed so that the rock itself becomes part of the support system. When soil nails are installed they modify the ground behaviour and can prevent or restrict
rock failure. They do this by transferring load from the unstable part of the rock mass to the soil nail itself and then into the stable ground. The strength of rod between the anchor and the rock is a measure of the effectiveness of this load transfer mechanism.
Due to the number of construction increaseing , it had a strong focus on self drilling soil nail. And this phenomenon has an impact on Sinorock,so Sinorock devoted more on the self drilling soil nails manufacturing.Sinorock has been a self drilling soil nail trusted
supplier of industrial components, parts and entire product lines.
Sinorock manufacturer self drilling soil nail system for rock reinforcement development,the Sinorock
self drilling soil nail is a dynamic bolt that yields to and withstand changing ground conditions. It is “a one-pass system, with no need for any grouting,”The Sinorock self drilling soil nail system is a permanent bolt that is less sensitive to poor ground conditions, such as weak rock mass. It
is suited for moving ground conditions as it slides at high load, maintaining high capacity support, he said.
http://www.tildee.com/JVYgli  

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2016年06月25日

Soil-nail:retaining walls

A soil nailing system includes a temporary retaining wall for an excavation sidewall. Soil nails extend outwardly into the soil sidewall and are integrated with the temporary retaining wall. The soil nails comprise an easily shearable reinforcing rod made, for example, of fiberglass so that the area containing the soil nails can be excavated after permanent walls are provided in the excavation.
A soil reinforced retaining wall for an earthen embankment is formed by screwing nails into the embankment at spaced intervals. The nails have helical threads extending therearound of such proportion and pitch as to screw into the formation as the nails are driven into place with a vibratory hammer, without prior boring of the embankment to accommodate the nails, or the necessity of cementing the nails into place. The wall is constructed from the top down and face panels are progressively assembled over the embankment and secured in place by the nails. In a preferred embodiment the nails have an elongate tubular body of a polyhedral cross-section and the threads are formed by twisting the body about its longitudinal axis.
http://www.generaccion.com/usuarios/94770/sinorock-soil-nail-is-for-stabilization-of-excavations  

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2016年06月22日

Soil nail: strong adaptability

Soil nail can utilize the self bearing capacity of soil and make the soil become part of the supporting structure.
The construction equipment has light weight, easy operation and little interference with the surrounding environment.
Soil nail has strong adaptability in the site environment and soil strata, especially in the cramped space and pile. The soil nail is also applied widely the soil strata which is difficult to create holes.
Soil nail adopts the section construction from top to bottom with the excavation of foundation, which will not occupy the separate operation time for high efficiency.
The supporting structure has great flexibility and good seismic performance and ductility.Safe and reliable.
The costs of the soil nail is approximately 30% lower than the other supporting methods.
The Sinorock soil nailing system offer an excellent choice for micro piles in difficult ground conditions where open-hole drilling isn’t possible.
In general, Sinorock recommends using the Sinorock soil nailing system in difficult soils that do not allow for open-hole drilling.
Sinorock soil nail system is manufactured from heavy wall steel tube. Soil nails are widely used as an efficient anchoring means, for drilling, grouting and anchoring in tunnel pre-support, slope anchor, mining, roadbed reinforcement and other projects, and they can work well in narrow space.It's available in different dimensions from R25 to T130.
Sinorock manufacturing facility is ISO 9001 certified, producing quality components that meet or exceed the Europe Standards.
The high quality soil nails of Sinorock is today in every concrete, building and infrastructure. The company holds together the framework that ensures the safety of each structure.
Sinorock soil nails play a small part in the product but they are of utmost importance for providing good qualiity to otherproducts, this is the reason soil nails are also known as Components of Industries.   

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2016年06月12日

Established tool-Soil nail

Many years of experience covering a wide range of mining methods and conditions make us confident that we can provide practical and implementable solutions to your rock mechanics and strata control problems in both hardrock as well as slope foundation - from sophisticated design using advanced numerical modelling tools to the quality assessment of support design and installation.
The soil nailing system of Sinorock has become an established tool in the industry for mining.Through innovation we have developed the simple and very effective system for supporting the foundation pit in inaccessible places. Our expertise has stood us in well stead in a number of major long-term research projects.
Soil with low shear strength, tensile strength almost can be ignored, but the soil has a certain structural integrity. When excavation of foundation pit, soil in the critical height of slope is in an upright position, when more than the depth or overload on the ground and under the effect of other factors, the sudden overall damage will occur. Traditional retaining structure are based on passive restriction mechanism. Namely by its own strength and stiffness, bear the following lateral earth pressure, prevents damage to the overall stability of soil. Soil nailing is set in soil body with a certain length and density of soil nailing, work together with the soil and make up for a lack of tensile and shear strength of soil itself. Soil nailing and soil work together to form a composite soil that can greatly increase the strength and stiffness of the undisturbed soil. Experiment shows that the vertical carrying capacity of the soil nailing wall in the top about one times more than a plain wall. More importantly, soil nailing structure is recognized as a good ductile characteristics.

Loaded during prime soil slope does not occur as sudden landslide, slope provides for the repair time, and reduce the loss caused by the slope of the slump.
http://soilnailing.over-blog.com/2016/06/sinorock-provides-expert-soil-nailing-support-for-civil-engineering-projects.html  

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2016年06月07日

Soil nails for stabilization

Soil nailing is used primarily for excavation support or slope stabilization. This process involves the installation of closely spaced soil nails drilled near horizontal and the application of a facing material such as reinforced shotcrete or structural mesh. The soil nails themselves tend to be small in diameter, typically 4″ to 6″, and consist of a center reinforcing bar surrounded by grout. Soil nail spacing usually ranges from 4′ to 6′ on center vertically and horizontally with the top row of soil nails generally being placed in the upper two feet of the excavation or slope.
From a design standpoint, soil nailing is a passive system attempting to place enough anchorage into the adjacent soil so it acts as a “reinforced block” to resist overturning. The load demand on each nail tends to be fairly low as they are intended to act as a group. In the case of excavation support, the facing is usually designed to take little load but more so tie the system together. In the case of slope stabilization, the facing may be designed to take more load and the nails may be post tensioned.
Advantages:
Soil nailing is generally faster and more cost effective than other excavation support methods.
Nail locations can easily be adjusted in the field if obstructions are encountered.
Soil nailing can be designed for temporary or permanent applications.
Shotcrete facing can be carved and stained to provide decorative finish options.
Soil nailing can be installed with relatively small equipment
Disadvantages:
Soil nailing is not well suited for applications below the ground water table
Soil nails may require permanent underground easements
Adjacent underground utilities can be a problem
Soil nail walls are less rigid than other methods and therefore may require underpinning of adjacent structures
Applications:
Temporary excavation support
Permanent excavation support
Slope stabilization
http://news.scoopasia.com/index.php/news/introduction_about_typical_soil_nails  

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