Working Platforms Working Platform Certificate 4 please ensure this TBT is printed with the NOTES Pages and that preparation is carried prior to delivery. Revised and issued for delivery with Safety alert re platforms Dec 2013. This talk also coinicides with the FPS Letter to Principal Contractors re working platforms Dec 2013

Why are we here today? 1 The working platform certificate was introduced in June 2004. Accidents, such as the ones we can see here, have still occurred since then because of failures of people or the process. Campaign running along side the FPS letter to Principal Contractors Dec 2013 re Working Platforms On the screen we can see: A de-rigged CFA26 rig. The rig was taken off the low-loader tracked onto site and sank into the platform. Terraferrma Mk1 Vibro rig. Open excavation and the machine toppled over. This TBT is being delivered to coincide with the FPS letter to Principal Contractor re Working Platforms Dec 2013. 2

Why are we here today? 2 On the screen we can see: Left - Hull incident where a PM20 driven piling rig collapsed as the platform gave way. Right – channel tunnel rail link 2003 3

BBGE had a signed platform certificate from the principal contractor. PM20 at Hull – Dec 2007 BBGE had a signed platform certificate from the principal contractor. Despite this, the platform had not been designed or tested. BBGE have been prosecuted because the tracks of the rig were within 2m from the edge of the platform. There was an opportunity for this to be prevented, an opportunity for the contracts engineer and site team to have stopped this from happening. Changes have been made to the working platform certificate to reduce the risk of this happening again. A photo of the rig after being placed back on site by crane, next to the road it fell across.

Luckily none of these shown are Cementation incidents – however an increase in piling platform Unplanned Event reports indicate the overall quality of platforms has deteriorated recently. This is one of the Companies biggest risk – we must ensure it is properly addressed. The safety alert Dec 2013 piling platform must be read in conjunction with this TBT.

Not just piling rigs and cranes February 12

Not just piling rigs and cranes February 12

Not just piling rigs and cranes February 12

Working Platform Certificate 4 The aim of the Working Platform Certificate (WPC) is prevent the reality of the earlier photographs. The WPC is the best safe system of work to employ, Recently revised after a period of consultation between the FPS member companies, including Cementation to reflect improvements to industry best practice (rev 4) Following BBGE’s experience at Hull The changes were introduced to ensure FPS member piling rigs do not over turn because of working platform failure, Piling platform certificates become the norm within the piling industry a number of years ago to improve standards on and prevent piling rig / plant instability and potential overturning. Both Cementation and the industry regularly review the adequacy and effectiveness of the working platform certificate. The latest revision WPC 4. This update TBT is to highlight the changes to the current working platform certificate.

Working Platform Certificate 4 The two biggest risks to the working platform are 1) poorly designed / installed platforms, or a platform that is not designed at all, and 2) changes to the platform, such as excavations, removing obstructions – poor reinstatement, ground water conditions, that can cause soft spots. The changes from the WPC3 to the current WPC4 reflect these two risks. The recent changes are to ensure FPS member rigs do not over turn because of working platform failure, after BBGEs experience at Hull. The two biggest risks to the working platform are poorly designed platforms, or a platform that is not designed at all, and changes to the platform, such as excavations, removing obstructions – poor reinstatement ground water conditions, that can cause soft spots. The changes from the WPC3 to the current WPC4 reflect these two risks.

REMEMBER WE ARE THE PILING EXPERTS FPS/WPC 4 page 1 Project Name Areas of site covered by the permit. The working platform designer needs to be stated. This is to ensure the working platform has been designed by a competent person. The equipment, and how it is being used on site, must be the same as the bearing pressures allowed for. THE NEW SECTION: To ensure the principal contractor thinks about the platform design, we ask them if any testing is specified (and it normally is)! The designer will normally ask for a selection of plate bearing tests, or similar, to be carried out to verify the design, and we want to be confident the principal contractor has fully understood their responsibilities. The principal contractor then signs the permit, because they are ultimately responsible for their site and subcontractors The revised WPC 1) Project name – Hopefully self explanatory 2) Work areas covered by this certificate – Is there enough space for the piling rig? Is the limit of the platform clear or does it require marking on site or on a drawing? Are haul road and ramps included? 3) The platform designers name, organisation, and contact number must be given, so the principal contractor has to have a platform design put in place. 4) The bearing pressures we supply that enable the platform design to be carried out must be the correct pressures for the rig actually on site. 5) The new section, added to prompt the principal contractor to look at the design. We don’t verify or approve the testing results, we want to be satisfied that any testing specified by the design has been done. 6) The principal contractor signs the working platform certificate, because they are ultimately responsible. REMEMBER WE ARE THE PILING EXPERTS

REMEMBER WE ARE THE PILING EXPERTS FPS/WPC 4 page 2 New page - For platform inspections by the principal contractor (TWC)*. The rate of inspections is not specified, but this should be a judgement from site, based upon the duration of the contract and the quality of the platform. EG. a short 1 week contract might not have an inspection. A contract with a high quality platform, concrete will also have few inspections. Inspections should be as a minimum weekly. Inspections are critical when something changes, such as removing an obstruction or service. The principal contractor must inspect and sign for any platform reinstatement. Page 2 – requires MINIMUM WEEKLY sign off carried out by the PC Temp Works Co-ordinator (not CSL Supervisor). Also sign off following removal of obstructions, reinstatement, repairs etc. CSL Supervisor must sign the platform DAILY inspection register (available within the Temporary Works section of OWoW) This is a physical activity NOT a tick in a box exercise. REMEMBER WE ARE THE PILING EXPERTS * Temporary works Co-ordinator

Guidance on working platforms REMEMBER WE ARE THE PILING EXPERTS FPS/WPC 4 page 3 Guidance on working platforms for tracked plant Four main areas of guidance 1) Design 2) Installation 3) Maintenance, modification, repair and reinstatement 4) Working platform layout These are detailed on the following pages Guidance notes – please take the time to read and familiarise yourselves with the content. REMEMBER WE ARE THE PILING EXPERTS

REMEMBER WE ARE THE PILING EXPERTS FPS/WPC 4 page 3 Design CDM regulations require - Designers must be competent Professional membership & practical experience Platform must be properly designed and installed to a recognised standard Using specific piling rig bearing pressures The type of fill material used is critical Changing the angle of friction of the fill from 35 deg -45 deg can half the platform thickness Platform must be free draining i.e. not hold water / slurry Suitable for persons to work / walk on. An Appropriate design testing regime must be in place to highlight any gross inconsistencies Platform must have a specific design life Starting before delivery of the piling rig ending on completion of all piling works Including load testing and remedial works Design CDM regulations require - Designers must be competent Professional membership & practical experience Platform must be properly designed and installed to a recognised standard Using specific piling rig bearing pressures The type of fill material used is critical Changing the angle of friction of the fill from 35 deg -45 deg can half the platform thickness Platform must be free draining i.e. not hold water / slurry Suitable for persons to work / walk on. An Appropriate design testing regime must be in place to highlight any gross inconsistencies Platform must have a specific design life Starting before delivery of the piling rig ending on completion of all piling works Including load testing and remedial work REMEMBER WE ARE THE PILING EXPERTS

Certificate is mandatory where a rig or attendant plant operates FPS/WPC 4 page 3 Installation Certificate is mandatory where a rig or attendant plant operates Must be signed by an authorised representative of the principal Contractor Signature confirms the legal duties under CDM have been carried out. The extent of the platform MUST be clearly defined and in accordance with best practice physically marked on site. Particularly important when platform is constructed / removed in phases Poor definition of the of the working platform is a major cause of tracked plant instability Good practice for the platform to extend at least 2m beyond the pile position. The Designer must be informed if working within the 2m zone is unavoidable – to ensure the designed platform can work to its edge The platform could also be suitable for follow on trades Access ramps must be of sufficient gradient, width & in a straight line to suit the plant within its stability constraints Certificate is mandatory where a rig or attendant plant operates Must be signed by an authorised representative of the principal Contractor Signature confirms the legal duties under CDM have been carried out. The extent of the platform MUST be clearly defined and in accordance with best practice physically on site. Particularly important when platform is constructed / removed in phases Poor definition of the of the working platform is a major cause of tracked plant instability Good practice for the platform to extend at least 2m beyond the pile position. The Designer must be informed if working within the 2m zone is unavoidable – to ensure the designed platform can work to its edge The platform could also be suitable for follow on trades Access ramps must be of sufficient gradient, width & in a straight line to suit the plant within its stability constraints

Maintenance, modification, repair and reinstatement FPS/WPC 4 page 3 Maintenance, modification, repair and reinstatement Platform must be kept free draining – water / slurry build can hide hazards such as Recently cast piles, trip hazards, uneven / unstable ground, services & excavations Slurry also transfer to work equipment increasing risks Removal of obstructions or any excavations made within the working platform MUST prior to work re-commencing in that area be - Reinstated to the original design standard and possibly tested and The ‘inspection log’ (WPC page 2) signed off accordingly The working platform shall be subject to regular inspection at least weekly by the Principal Contractor TWC* recorded in the inspection log (page 2 WPC) Throughout the platforms design life and After any reinstatement or works which might have modified it Damaged or inadequate areas identified must be reinstated to the design standard. CSL Supervisor must inspect DAILY and complete the daily inspection register available within the Temporary Works section of OWoW Platform must be kept free draining – water / slurry build can hide hazards such as Recently cast piles, trip hazards, uneven / unstable ground, services & excavations Slurry also transfer to work equipment increasing risks Removal of obstructions or any excavations made within the working platform MUST be prior to work re-commencing in that area - Reinstated to the original design standard and tested and The ‘inspection log’ (WPC page 2) signed off accordingly The working platform shall be subject to regular inspection at least weekly by the Principal Contractor TWC* Throughout the platforms design life and After any reinstatement or works which might have modified it Damaged or inadequate areas identified must be reinstated to the design standard. Following the inspection the Working Platform Regular Inspection Log shall be signed by an authorised representative of the PC and issued to the contractor with revised layout drawings as appropriate. CSL Supervisor must inspect DAILY and complete the daily inspection register available within the Temporary Works section of OWoW * Temporary Works Co-ordinator

Working Platform Layout (WPL) FPS/WPC 4 page 3 Working Platform Layout (WPL) Items that must be included and properly located on the WPL drawing would include detail of platform edge and 2m delineation, trials pits, services or voids Areas of backfilling Known underground basements, Areas that are covered by the certificate Test locations (if specified by the platform Designer) And any other feature that may affect the safety of operations. Items that must be included and properly located on the WPL drawing would include detail of platform edge and 2m delineation, trials pits, services or voids Areas of backfilling Known underground basements, Areas that are covered by the certificate Test locations (if specified by the platform Designer) And any other feature that may affect the safety of operations.

FPS/WPC 4 An example completed platform certificate, Page 1

FPS/WPC 4 An example completed – Working Platform regular Inspection Log - Page 2 Compare the completed WPC and inspection log to the project WPC. If this is not in accordance with the above slides it must be corrected immediately.

Summary There are two changes to the FPS working platform certificate: There is now a section for the Designer to specify testing details. There is now a log for regular inspections by the principal contractor. Cementation Supervisors to inspect and sign the DAILY inspection record.

Any Questions?