Our 2016 Autumn Update focuses on three main topics:
- Projects in the Petro-Chemical and Electric Transmission sectors
- Training/Quality Initiatives
- Deep Foundations Institute (DFI) Micropiling Conference in Vancouver Spring 2017
Petro-Chemical and Electricity Transmission Tower Case Studies
During the last quarter we have been involved in numerous major Petro and Chemical projects around the UK. TGS normally operates as a specialist geotechnical sub-contractor but we are nearing completion of a four month project, acting as the Principal Contractor for the world’s leading chemical company. TGS is responsible for the construction of all the sub-structure works, including slab removal, excavation, drilling and grouting of collapsed mine workings, high capacity mini-piles, tower crane base, pad foundations, ground beams and suspended slabs. The existing building footprint is 35m by 25m and when the roof is extended, the 35m high building will accommodate sophisticated and heavy process machinery.
TGS is responsible for the geotechnical design and the project has focused on achieving a fast-track programme and the most cost effective solution. We provided early stage cost, risk and feasibility advice, which was closely followed by the contract design and construction of the sub-structures package.
The consolidation of the coal workings involved grids of primary and secondary drilling, together with the comprehensive treatment of an extensive bell pit on the site, using two of our Boart DB102 drill rigs. The drilled mini-piles were then installed using two powerful Hutte 205 rigs, incorporating high capacity rock sockets below the coal workings. The piles were installed to depths of up to 22m to support compression and tension loads of 1200kN and 1800kN respectively. We installed a test pile to a maximum load of 1800kN, carried out in accordance with the ICE specification. The pile movements at 1200kN (WL) and 1800kN (1.5xSWL) were 3.93mm and 6.82mm respectively.
Due to the importance of the programme, the critical geotechnical works were carried out using multiple rigs/crews throughout day and night shifts. Stringent monitoring of the works was in place, including gas monitoring throughout.
We have also recently completed two projects within the Grangemouth facility in Scotland, where pile installation was achieved in very restricted access. These works were required in and around existing buildings, pipes and bunds/tanks, which required using bespoke frames supporting our Marini drill masts to install 15m deep, 150mm diameter grouted micropiles. The piles were installed through our pre-cored holes of up to 1m deep. The ground conditions in this area are notoriously weak and variable, so preliminary static load testing was undertaken.
TGS have undertaken many electrical transmission tower foundations across the UK, using a variety of driven, augered and drilled (including micropile) techniques. Our latest project in the NW of England used our Klemm 708, equipped with a 4m restricted mast, to install 300mm diameter augered piles to depths of 15m.
Training/Quality Initiatives Training is a priority within our business and, in addition to the routine qualifications and certification, during the past six months all our personnel have completed:
- Asbestos Awareness.
- Essential Minimum Safety Standard (EMSS), a recognised safety qualification for working in the Chemical Industry and other high hazard environments.
This month TGS received a five star RISQ Accreditation via Audit, which covers all of our operations within the Rail Sector and forms the back bone of our Health, Safety, Environmental and Quality Procedures.
All of this is backed up by our SSIP Acclaim Health & Safety Accreditation.
DFI International Workshop on Micropiles, Vancouver – Spring 2017
TGS is a major sponsor of the 13th International Workshop on Micropiles which takes place between 29 th March and 1 st April 2017 in Vancouver, Canada. It brings together consultants, specialist contractors, material suppliers and some of the world leading geotechnical academics.
The event is generally attended by over 150 professionals, represented by North and South America, Europe, Asia, Africa and Australia. Micropiling has changed and expanded dramatically, since the concept of pali-radice was introduced by Fernando Lizzi in the 1950s. The event provides an opportunity to discuss experiences and recent developments.
All participants are encouraged to share their knowledge, something which rarely happens in the highly competitive business world. This event provides the chance for peers to interact by sharing experiences in a workshop environment and to keep in touch between the bi-yearly events, in order to drive forward research and development in this field.
We highly recommend that anyone with an interest in this technology attends/contributes.ISM 2017 Micropiles: Resisting and Remediating the Effects of Mother Nature