Liftec “can do” for East London Line
EAST LONDON LINE NORTHERN SECTION EXTENSION At the end of 2007 Liftec were asked by Balfour Beatty Carillion, in conjunction with Transport for London (a joint venture) to design and install 11 lifts for the northern section of the East London Line, with the addition of a sample lift at our Dartford office to demonstrate that the lifts would fully meet the requirement of the detailed specification including carrying out a safety gear test with unequal efficiency to at least 70% one side and 30% the other. Liftec agreed to build the sample lift at our premises and the project started using our in-house design team and tried and tested third party equipment, we had the concept of the lift and its component parts approved by early 2008. To ensure we could meet the requirement of the 70/30 safety gear test, Liftec fitted VG Bi-directional safety gears and carried out the test in the more extreme 100% one side and 0% on the other which, whilst still a minimal risk of happening, is a possibility if the linkage between the two blocks becomes disengaged. This test was seen to be successful with a deflection of only 2% and made all the more impressive, as all parties could watch the test.
Liftec Lifts Ltd, Unit7, Orbital One, Green Street, Green Road, Kent, DA1 1QG
ISO 9001 ISO 14001 OHSAS 18001 BUREAU VERITAS Nº 22785
Wind pressure was a design issue, so we approached Wittur with the intention of using Selcom Hydra doors; these would fully drive the doors to the closed position before releasing and locking the landing door. Selcom helped by specially designing the doors for this project to meet our clientâ€™s specification, with release mechanisms in the doors and double clutch centre opening doors with zone locking. Liftec chose Ziehl Abeggâ€™s permanent magnet gearless motors and drive units which included evacuation drives to recover the lifts to the exit level should there be a power failure. Kollmorgen were chosen to produce the control panels and staff interface panels as they had a proven MRL panel which made a good base for our requirements. The design of the control panel needed to be split from the normal MRL single control panel and incorporate the rescue and diagnostics required for any London Underground lift. Kollmorgen helped develop the staff interface control panel which housed the Castel lift isolator, single phase distribution board and segregated controls for staff and engineer use. These allow the station staff to view the operational LEDs and move the lift, if the safety circuit is correctly made, to floor level and open the lift doors. Under the cover of the engineerâ€™s panel are further controls to allow the rescue of passengers should the lift have failed due to a safety circuit i.e. over travelled or safety gear operated. Along with switches for testing the brake operation and reset of the over speed governor, there are also controls to manually move the lift should all other devices have failed. This staff interface panel was designed to match the main control panel in size and style, bringing symmetry to the landing entrance. The other remit for the design of this panel was to conceal all wiring and terminal from staff and public whilst the door was open and therefore limit any hazard. One of the most complicated circuits for these lifts was for the lift alarm which for any standard lift is one of the easiest. There are many integrated functions that all need to perform cohesively which required Liftec to generate two pages of circuit diagrams. The sample lift was completed and tested by the end of 2008 and subsequently witness testing and full design approval was carried out January 2009. The lift was then mostly dismantled and shipped to York EMC in Castleford for EMC testing to meet the extra requirement of the railway and underground environment. Upon passing the test, the lift was returned and reassembled at Dartford, where it takes pride of place as a working example of our engineering ability. Liftec started installing the new lifts at Dalston Station at the beginning of April 2009 and had staggered starting dates for the other stations. Typical of many building projects there were construction snagging, hold-ups and one unexpected problem of water ingress and support pockets missed out in the shaft. These were all overcome with agreed solutions from Liftec and Brian Thompson the CRE for BBCJV. All lifts were completed and tested and handed over by early December 2009 to the satisfaction of all parties.