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The Baby Giraffa Is the Answer for JTS Geotechnical Solutions

Skelair International has recently supplied JTS Geotechnical Solutions Ltd with a Baby Giraffa for a large-scale project in Brighton. Working as part of the Royal Sussex County Hospital £486million redevelopment (the 3Ts redevelopment), JTS Geotechnical Solutions Ltd was hired by the main contractor, GallifordTry. JTS Geotechnical Solutions Ltd is a specialist geotechnical contractor offering both installation and design, and installation services for such works as ground anchors, soil nailing, drilling and grouting, piling and earth retaining walls.

Prior to the construction of the Clinical Admin Building, JTS Geotechnical Solutions Ltd was contracted to secure the chalk-based wall at the rear of where the new building would be. In order to secure the wall fully, JTS Geotechnical Solutions Ltd had to dig into the chalk banking, which was at a 30° slope to set it at an 80° slope. “The chalk ground presented some challenges,” said James Fram-Taylor, Managing Director at JTS Geotechnical Solutions Ltd.

“Initially we hired a rotary percussive drilling rig to undertake the work but the chalk was soft and wet at approx. 2.5mtrs deep and it was clear that the self-drilling method was going to be an ineffective method,” continued James.

After hearing about the challenge faced, Skelair recommended the Marini Baby Giraffa, a highly flexible and lightweight rig that’s capable of squeezing into tight spaces – perfect for the task in hand. Once on-site, the Baby Giraffa was tasked with drilling 290 ground anchors, 6 metres by 100mm in diameter, in a 1.5metre horizontal and vertical formation.  “The Giraffa was capable of open hole drilling, leaving a perfect hole in the chalk when withdrawn, which was exactly what we needed. I was really impressed with its capabilities, it’s a drilling rig and with its versatile mast that can drill from any position and managed to get into a tight space that no other rig could have managed; it really came into its own on this project,” said James.

Once the drilling was completed, JTS Geotechnical Solutions Ltd retracted the auger and pumped in liquid grout followed by a 32mm reinforcement threaded bar. A black heavy duty drainage membrane was placed on the slope and it was secured in place with a heavy duty 7mm reinforcement mesh then 225mm diaphragms were fitted to the 7mm mesh at 500mm centres then 350mm bearing plates were placed over the nails then a domed load nut was fitted.  At this point a 4mm mesh was then fixed onto the diaphragms which formed a mini gabion mattress that went all the way to the toe of the wall. A 40/75mm stone was then poured into the basket from the top of the slope and formed the newly stabilised wall. James concluded: “The stones tend to be for aesthetics but they can also help with the drainage from the wall,’ concluded James.

John Mayo, Managing Director, Skelair, said: “While we believe in the abilities of our machines such as the Baby Giraffa, it’s always great to hear positive feedback from our clients such as JTS Geotechnical Solutions Ltd. The Baby Giraffa remains one of our most popular rigs, it’s capabilities aren’t hindered by it’s size, in fact it’s the size and flexibility that makes it one of the most versatile rigs on the market.”

 

Skelair Adds EMCI 4.50 Rig to its Fleet

Skelair, leading supplier of Ground Engineering and Rock Drilling equipment has added a brand new EMCI 4.50 Drill Rig to its rental fleet. Manufactured in 2017, Skelair’s customers will be the very first to road test the machine.

The rig is a small and versatile piece of kit, the fixed crawler width is 1300mm and it’s mounted on a rubber track that is 230mm wide. There is a remote control for tramming, and the steel frame supports Skelair - EMCI 4.50 - Pic 1four hydraulic stabilisers. “We’ve bought this drill for our customers’ specialist geotechnical projects, specifically for rotary, rotary-percussive, coring and soil sampling requirements,” said John Mayo, Managing Director at Skelair.

Designed for projects with restricted headroom, the mast has an overall height of 3700mm and a stroke of 2400mm. The rotary head has a twin hydraulic motor, with a maximum torque of 300daNm and a maximum speed of 480rpm. The 49HP Yanmar diesel engine is more than enough power for the rig’s 2780kg (2.78tonne) weight.

John continued: “Demand for our rental rigs continues to increase, so we not only try to ensure we have a wide range available for our customers, but that we are providing them with the latest models that we can. The new EMCI 4.50 will sit alongside the previous model so clients will have a choice.”

 

 

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