Friday, 25 August 2017

Screw piles and screw piling.

What is a screw pile?
A screw pile is also known as a helical pile, helical anchor, helix pier, screw anchor, helical pier, torque pile and/ or torque anchor.

What is screw piling? 
In unstable grounds when a traditional cast-in-place foundation system is not possible, screw piling offers a foundation support system for an ever increasing number of applications. Screw piling is the application of a screw pile into the ground. A screw pile is a factory manufactured steel foundation system consisting of a central rod with one or more helix shaped blade plates and a bracket at the end that allows attachment to a structure. The tip is cut on an angle to allow it to penetrate the ground as a pilot. The pile has 'flights' which are flat in pitch to help the pile pull itself into the ground with minimum downforce applied. With the use of an excavator and a hydraulic screw anchor drive motor attached, the screw pile is screwed into the ground to the desired compression torque or depth.
You can find out about the history of screw piling here and review some advantages to the process here.

Tuesday, 22 August 2017

Rusin Concrete Construction “shattered expectations with excavation speed” using their new Bigfoot XD 1200 Digga trencher.

Based in Colorado Springs, Colorado, Rusin Concrete Construction have been offering a wide range of concrete services for commercial and residential projects for the last 20 years. Earlier this year they were commissioned to excavate grade beams for a multi-unit housing project in Colorado Springs.

Project Manager, Tyler Orr explained, “The total structure square footage for the slab on grade was approximately 11612sq m. Grade beams were 300mm wide and 900mm deep below the slab and were the structural component of the project in lieu of typical foundation walls. We trenched about 14km by the end of the project and shattered expectations with the excavation speed.”

Rusin purchased the Digga Bigfoot XD 1200 trencher at the World of Concrete convention in Las Vegas especially for the project. It was a bit of a gamble as they had never used a Digga trencher for such an application before, typically digging with a mini excavator. However, all models in the Digga Bigfoot XD trencher range can be fitted to excavators up to 8 tonne, skid steers and backhoes and will trench as deep as 900mm.

The team at Rusin attached their Bigfoot XD trencher to a Case TR320 tracked skid steer loader which was ideal – the tracking giving them extra stability helping to keep the trencher in line during the operation.
Tyler said it proved invaluable for the team, “We could trench about five times quicker than a mini excavator could dig and the trenches were neat and clean which resulted in us saving on concrete material at the end of the project.”
The Bigfoot XD trencher features a unique Headstart Crumber system which allows you to start digging with the crumber bar on the ground. This not only eliminates the need to get in and out of your machine to drop the crumber to its working position once the depth has been reached, saving you time; it will also leave the bottom of the trench flat and clean with the durable scraper shoe.
In this instance, thanks to these unique Digga features, Rusin were able to save time and money.

Rusin commented, “Digga’s Bigfoot XD Trencher brought so much value to us that we bought a second trencher to increase our production on another similar project. We would absolutely recommend a Digga Trencher to anyone for any size of trenching project!”

For more information on the Digga Bigfoot XD Trencher range click here.

Monday, 21 August 2017

Digga tips - attachments for drilling in different ground conditions.

When drilling in different ground conditions you need the right speed and the right cutting system on the auger to suit the different ground conditions. For efficient drilling on any machine requires power (torque) and down pressure.

Digga augers perform better at an optimal RPM against the ground conditions they are against. Similarly the auger diameter will perform better at certain speeds.
For example: the larger the hole and harder the ground conditions, the slower you will need to drill. The smaller the hole and softer the ground conditions, then more speed is required.

Digga recommends the following for attachments for the different ground conditions:
  • When ‘general purpose’ earth drilling you can drill faster. The Digga A range of augers will be ideal here. These augers are also better for clay as the bladed teeth ‘shaves’ the spoil a layer at a time. Like scraping butter with a knife.
  • In heavy earth, clay*, soft chalky rocks you want an auger with tapered teeth. The Digga RC range of augers is the ultimate all performance auger and will cut cleanly into earth and chalky rocks. The teeth are tapered to be able to rip the fracturable rocky/earthy ground. *Please note, this range is not ideal for drilling in clay with smaller machines 4 tonne and under.
  • When drilling into rock you are going to be most effective at a slower speed with a greater amount of power. Too much speed creates too much heat and will actually ‘polish’ the rock smooth rather than chipping away at it. Too much speed will also cause the teeth to skip across the top of the rock and it will not be able to pick and rip into the rock to break it out.
You can find more information about drilling in rock here.