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Support project with Sinorock SDA bolt micro piles

Le 13 juillet 2017, 10:19 dans Humeurs 0

With the increase of Chinese companies’ assistance programs to other countries, construction technology has also been used in different fields, of which, self drilling anchor bolt is a rather simple and efficient method to support project. It combines drilling, grouting and anchoring together, its length can be cut and increased according to your demand. After grouting, slurry is full of drill hole and bonds self drilling anchor bolt with stratum, which can enhance anchoring effect and then support project.

The Sinorock SDA bolt solution is designed for optimized installation, tailored to the project’s needs. By drilling a hole in collapsing soil or loose rock, with a sacrificial drill bit and a hollow rod, and after the drilling operation injecting grout into the hollow rod and surrounding cavity, makes it a top productivity solution.

Applications

The application circle below displays the three most important areas and industries where the Sinorock SDA bolt is best utilized

Slope stabilization Is used to stabilise mostly unstable rock/soil formations which are normally benched prior to the installation of the "soil nails". The unconsolidated or weathered ground conditions favour the technique of Self Drilling Hollow Core Anchors (SDA) for the fast and simple method of installation compared to the traditional methods of cased boreholes and inserting of a suitable tendon.

Foundations with micropiles

Sinorock SDA bolt micro piles can be defined as small diameter replacements, drilled piles, composed of injected grout with the Sinorock SDA anchor rod as steel reinforcement to resist the design load. The Sinorock SDA micro piles can be installed in sites with limited headroom, restricted access capability with light drilling equipment which have low noise and vibration and require minimal site preparation.Sinorock SDA can be installed successfully into most ground conditions including rock and is suitable for tension and compression loads. The big advantage is the combined drilling and grouting making high piling outputs possible.

 

 

 

 

 

 

 

 

 

 

Sinorock self drilling anchor system can be used on different conditions

Le 28 juin 2017, 04:49 dans Humeurs 0

SDA bolt is a kind of hollow bar with continuous thread, one end connects to drill machine and another one connects to one-off drill bit. When drilling, slurry can be injected through hole of bolt, which realizes integrated construction of drilling, grouting and anchoring. After grouting, it can ensure cement mortar and cement paste wrapping overall length of SDA bolt, contacting with surrounding soil body and then forming a combination. When grouting, slurry is from bottom of hole, stop-grouting plug is installed to realize pressure grouting, which can fill gaps in sandy gravel stratum, enlarge diffusion radius and anchoring range. So, SDA bolt has good anchoring effect in loose stratum.

A lot of experience have shown that SDA bolt in loose stratum has safe, reliable and convenient characteristics and can be widely used in urban engineering construction.

Except meeting mechanical supporting condition, specific install direction of self drilling anchor system has a connection with location of anchoring stratum, retaining structure and construction condition. Inclination of self drilling anchor system should avoid the range of -10°~+10° with horizontal plane, because after grouting, slurry’s sediment and bleeding phenomenon will influence self drilling anchor system’s carrying capacity.

Self drilling anchor system’s carrying capacity is relative to limit friction resistance of soil body. Generally, soil texture at super stratum is poor than sub stratum, at the same anchorage length, the smaller inclination, the shorter anchorage body in good soil texture.

So, before formal construction, fundamental test of self drilling anchor system should be done to get relation between inclination and length and then provide design research decision.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Installation of Sinorock Drill Injection Piles causes minimal disturbance to surrounding structures.

Le 20 mars 2017, 10:22 dans Humeurs 0

Hollow Bar Micropiles are constructed using bespoke hollow, threaded steel bar which is drilled and simultaneously grouted. It is typically drilled using rotary percussive techniques and bore stability is maintained by pumping grout through the centre of the steel bar as the pile is progressed.

The steel bar is progressed into the ground using sacrificial drill bits selected to suit the ground conditions present. The steel bar forms the structural element of the pile and the grout acts as the load transfer mechanism from the steel bar to the ground to achieve the geotechnical capacity.

This technique is suitable for a variety of ground conditions and is not susceptible to issues relating to groundwater levels. This technique is particularly effective in granular soils where the geotechnical capacity regularly exceeds those calculated through conventional methods.

Sinorock Drill Injection Piles consist of a micropile (or minipile) bar that can be both drilled and injected with grout during installation. The fully threaded rod sections can be cut and coupled at any point, enabling quick and easy installation in areas of restricted access or limited headroom. 

Installation of Sinorock Drill Injection Piles causes minimal disturbance to surrounding structures. 

The system also enables additional rod sections to be added in-situ, for pile extension in poor ground where the depth of the bearing strata is unknown.

Sinorock Drill Micropiles

Simultaneous drilling and grouting ensures that the grout is continuously placed over the full depth of the micropile, enabling grout to permeate the surrounding ground and increase skin friction. 

Rotary percussive installation ensures high rates of production and provides good directional stability if obstructions are encountered. 

Applications for Sinorock Drill Injection Piles include but are not limited to: column bases, foundation upgrades, mast stabilisation, refurbishment of old structures, and gantry bases for overhead power lines on electric rail projects.

 

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