mitigating the significant risks - iirsm 3 - mitigating the... · others p.m gleeds cdm-c scott...

Mitigating the Significant Risks

RIBA

Designer CDM Analysis and Options Matrix - Hazard Identification and Significant Risk Management Project & No:-:- Solent University Campus 14677 Work Stage :- F Revision & Date: 19 Aug 21st 2015 HAZARDS and SIGNIFICANT RISKS

BUILDING FORM, MATERIAL, , ACTIVITY, LOCATION

ELIMINATE or AVOID risks (During early design stages) SFARP

REDUCE or MINIMIZE risks ALARP by :- (During all design stages) Safe systems of work & protection >

INFORMATION To be provided with the design eg Specialist Design & client input

CONTROL METHODS Contractor or Client Manage -ment Systems

ACTION OWNERS & DATES - OTHER SPECIALIST

GUIDANCE & COMMENTS Agreed Agr’d in

principle Not yet actioned

Team Sign -off status Client S. Solent University Architect Scott Brownrigg Struct. Eng SWH (Str) Services Eng Arups (Ser) P. Contractor Interserve (ICL) Others P.M Gleeds CDM-C Scott Brownrigg Landscape Cost Consultant F & Gould

1.0 PROJECT CDM APPROACH

This document is a visual and minimal text analysis of the key CDM Design stage issues identified by the project team with associated Significant Risks identified and design or control methods recommended. The Project Development team should help to resolve outstanding issues in the Detailed design stages plus add further issues identified for team discussion and resolution. This is a CDM Design and Issue Tracking document, and will ultimately be the Pre-Construction Information for the project for further development by the Contractor.

Project and Contractor Team to develop this document as scheme evolves.

1.0.1 FRONT ENTRANCE

The new entrance provides a stunning highly glazed vista into a New Academic world as viewed from East park.

WORK AT HEIGHT ISSUES

ASBESTOS TEMPORARY

PROPPING

CDM OVERVIEW:-

1. Atrium roof access to metal roofing , roof lights and gutters. specialists to be consulted.

Contractor and roofing specialists to liaise for construction and maintenance stages

2. Interface construction with Millais including Asbestos removal issues.

Contractor to agree extent and programme with specialist asbestos removal company

3. Construction during operation of existing Millais building and University Campus

Contractor and client to liaise. Contractor to make proposals .

4. Maintenence and cleaning of Atrium end glazed wall, inside and outside

Client prefers a MEWP on the raised podium and inside via large doors in elevation.

5. Large steel vertical fins to brace the atrium glazed wall will require cranage and temporary bracing until connected to roof structure

Cladding, steelwork and main contractors to liaise. Roof braced for horizontal loads

6. Integration of Smoke Vents at high level with maintenance access

Smoke venting details to be agreed, including make-up air in front elevation?











1.0.2 THE ATRIUM AND NEW ACADEMIC BUILDING WORKING AT

HEIGHT ASBESTOS MULTIPLE

TRADES IN CLOSE PROXIMITY

HEAVY LIFTING OF LARGE OBJECTS

FIRE STRATEGY

CDM OVERVIEW

1. Atrium Roof Construction and maintenance access- Revised design

MEWP access agreed with client internally. IRATA trained fall restraint access to external flat roof

2. Millais elevational and structural modifications with asbestos removal issues

Contractor to agree programme with client.

3. Open balcony construction to New Academic Building with associated temporary protection prior to final handrail installations. Minimize working at height.

In-situ slabs with possible offsite manufacture of balcony pods, craned into place.

4. Access to ceiling lighting on balconies to prevent falls over balustrade, by podium steps

Client agreed podium steps to be used on balconies.

5. Construction and maintenance of pod feature at centre of atrium. Offsite manufacture and cranage.

Contractor /designer to agree details with specialist. Proposal required at tender.

6. Fire Engineering of Atrium during construction phase with long travel distances and large amounts of scaffolding and temporary protection. Alternative exits from Millais required.

Construction phase fire strategy to be agreed between contractor and SSU , for operatives and users of Millais (see details later).

7. Access for construction vehicles into atrium due to raised levels above ground and hole in atrium slab.

Contractor site access plan to agreed

8. Retain occupation of Millais throughout works, ventilation, daylight v Noise, dust and distraction, Means of Escape.

Contractor and client to agree programme, timings, details. Noise will be very problematic to counter.

Revised roof design, flat with heavy box section beams, & metal decking

Services in Pod bridges requires access from above or below for maintenence

Netting to be used in roof construction, net attachment holes required in beams?











1.0.2A THE ATRIUM AND NEW ACADEMIC BUILDING WORKING AT

HEIGHT ASBESTOS

REMOVAL OFF-SITE

MANUFACTURE

CDM Overview and significant risks arising during project development

1. New Cladding to face of Millais to enclose services and existing structure.Asbestos panel removal from Millais Elevation. Scaffolding will be required for both processes but inhibit atrium floor completion.Continuity of Millais use essential. Timing of works critical. Plasterboard will need maintenance, and no wet cleaning

Contractor to consider the coordination of these activities. Maintenace of plasterboard and windows by mewps. New Millais windows added to contract and opening windows specified for maintenance

2. Structural steel box beams for metal Roof , to be craned into place onto preplaced column supports

P.Contractor to agree details with structural engineers

3. Atrium floor structure and finish to be suitable to allow MEWP access without additional protection. Existing Millais roof area tbc

Design Team and client to agree suitable surface and details to take MEWP’s loadings

4. Cantilevered balconies could include off-site manufacture of walls and roofs, with in-situ slab.

5. High level , lighting and smoke detectors within the Atrium in accessible locations via MEWP. Low level lighting fittings client preference but inadequate cover.

P. contractor to consider options for speed of construction, cost and safety

6. Non- flammable steel outer skin to pod painted. Jointing techniques require spraying in the atrium ahl.

Design team to make proposals to prevent overspray and provide access to finish.

7. Temporary edge protection to balcony edges until glazed balustrades in place. Sockets for panels to be cast in slabs.

Structural engineer to design in pockets into slab edges for temporary panels.. Contractor to consider or propose alternatives

Revised pod design

Balustrade height 1100mm but may be inadequate where seating ? 1300 or 1500mm used elsewhere eg. Food courts. No ledges

for objects











1.0.3 THE ATRIUM AND NEW ACADEMIC BUILDING & MILLAIS EXTERNAL ISSUES

CDM OVERVIEW:-

1. Capital Costs v Revenue costs of maintenance.

Client preferred to minimise capital cost ie. Hire in plant for cleaning building and windows

2. Roof access issues to include one full staircase rather than steep or vertical ladders.

Client agreement to East Stair to be taken upto roof as adjacent to lift.

3. Roof plant placement and future removal on NAB.

Mobile Crane to be used from carparking area

4. Roof plant modifications and access to Millais roof

Subcontractor details required

5. Window cleaning to North, West and East elevations and Millais.

MEWP from car parking areas , at weekend , holidays or out of hours. Details to be finalised.

6. Cleaning access to interior elevations of Atrium

MEWP agreed with client, but plasterboard will not allow wet window cleaning solutions.

7. Revised Roof Construction and maintenance internally and externally.

MEWP internally and IRATA trained access externally

8. Warranty requirements v SSU maintenance requirements

Client , Designers and specialist supplier to advise

9. Block paviors to podium area and steps

Healthy cutting and laying techniques to podium areas

7. Revised Atrium roof design

9











1.0.4 THE ATRIUM AND NEW ACADEMIC BUILDING

CDM ISSUES:- 1. Elevation construction 2. Pod construction 3. Pre-fabrication v On-site

assembly 4. Speed of construction v

cost v risk v aesthetics 5. Basement construction

over existing ramp and adjacent to Millais

6. Excavations and foundation

support for Millais 7. Existing underground

heating service pipes and other services under existing ramp.

8. Construction vehicular

access from site compound areas into atrium obstructed by new building?

9. Cantilevered balcony construction may include offsite manufacture

10. Breaking out of concrete

structure to existing ramp areas











2.1.1 TOWN PLANNING SITE PLAN

Enabling Works contract to set up the new road entrance to the site off the eastern dual carriageway. To link up with previous phase of enabling works to planters and parking areas. Main Contract- Detailed Site set-up to reflect latest changes in design and layout.

No pedestrian

access











INTERSERVE SITE SET-UP











TOWER CRANE PLAN











TOWER CRANE ELEVATION











2.2.1 ASBESTOS REPORT / REGISTER FOR THE CAMPUS BUT ESPECIALLY MILLAIS BUILDING

SSU - Millais Building - Asbestos Cladding The existing external wall cladding panels to the Millais Building (the panels below the windows) contain a form of asbestos. Clearly, this hazard will have to be highlighted in the CDM documentation and on our design drawings. It is also likely that SSU will wish to have the panels removed and safely disposed of either prior to or as part of the New Academic Teaching Building project.

Client has pro-vided Register and Survey with annotated drawings. SB to coordinate with design proposals. In Stage D documentation

Can panels be left in place and highlighted on drawings and on site where modified, or to be retained?

Client- SSU Design team Contractor to consider the implications, costs and programme of such a strategy at tender stage. Details agreed for summer of 2015

2.2.1A EXISTING BUILDING ASBESTOS

ASBESTOS CONTAINING MATERIALS (ACM’S) MAY BE PRESENT

Identify where asbestos may be present and see if it can be retained safely or must be removed. A drawn survey with marked up drawings would be better than a narrative report, unless asbestos is minimal.

Signage to be used on site if ACM’s present

Contractor to assume asbestos is present unless informed otherwise.

Refurbishment asbestos survey provided by client. This is essential for construction phase plan. Timing of works? Enabling or post watertight? Asbestos in Flooring in Millais confirmed by client ?

Asbestos Register Post Completion register to be provided by Principal Contractor at end of contract for inclusion in the Health and Safety File. This must include reference to additional asbestos removed and asbestos that has been identified but encapsulated in project.











2.2.1D ASBESTOS SURVEY OF MILLAIS BUILDING

1. Statement on drawing“Asbestos washers orshims to be used to obtaincorrect mullion level”

2. Strategy for removal to beconsidered by project team.

3. Do we as a team have anunderstanding of what thisentails with respect to ourworks? Is this a concretestructural mullion or thewindow mullion?

4. Surely we will not be takingthese shims out ofexisting/retained structureor windows that we are nottouching? Is the asbestosnot encapsulatedsomehow?

5. We seem to need a betterintrusive survey toascertain the exactconfiguration and conditionof the ACM.

6. Then we can devise acourse of action.

7. A Refurbishment Asbestossurvey was commissionedby the client to clarify theissue?

8. Team- Will this needexternal or internal accessor both?

Tony Largent- Client FM contact for scanned existing information. Other Millais record drawings may be available.











2.3.2 LEVEL 00

CDM OVERVIEW ISSUES 1. Partial Basement

Construction 2. Adjacent foundations and

structural interfaces 3. Construction access into

Atrium zone? 4. Levels, sloping site 5. Works inside , on-top of

and to elevation of Millais during occupation?

6. Extent of decant of Millais during construction

7. Construction phase fire strategy.

8. Diversion of Millais access and escape routes

9. Asbestos Survey of Millais- How much impact on design?

10. Temporary protection of Millais elevation

11. Roof works to Millais with waterproofing and plant implications

12. Temporary structural works

A B

Staircase escape reversed below Level 01 to compensate for 2 lost

exits to north elevation A & B during construction. Reinstated on

completion

Exit retained into Students union

during construction











2.3.3 LEVEL 01

CDM OVERVIEW ISSUES 1. Integration with existing

deck and flat roof withfragile rooflights

2. Existing Services3. Adjacent foundations and

structural interfaces4. Construction access into

Atrium zone?5. Levels, sloping site6. Works inside , on-top of

and to elevation of Millaisduring occupation?

7. Extent of decant of Millaisduring construction of linksetc.Client/PC

8. Construction phase firestrategy.PC

9. Diversion of Millais accessand escape routes C/PC

10. Asbestos Survey ofMillais- How much impacton design?

11. Temporary protection ofMillais elevation

12. Roof works to Millaiswith waterproofing andplant implications

13. Temporary structuralworks

14. Access doors intoAtrium for roof access MEWPS and large pieces of equipment for displays, exhibitions, etc. easily removable panels to front elevation or doors adjacent to revolving doors.

Suggested construction stage material, vehicle and personnel route into atrium from site compound. Levels of terracing to be considered for actual location and viability

Fire Exits closed during

construction Main Millais

entrance and fire exit during construction

Millais scaffolding zone above existing roof fabric, not suitable for

MEWP loadings

Millais Level 01

Fit-out and new

glazing











6.3 EXTERNAL WINDOWS AND ATRIUM END FACADES CLEANING

Inward Opening window s for cleaning from inside. Eliminates need to clean inside the external façade screen Fixed structural glazing at ends of atrium need cleaning inside and outside. Millais windows to be considered.

DESIGN TEAM cleaning strategy that is agreed by the clients facilities management team. Hired MEWP equipment and long poles at lower levels ( upto 4/5 storeys) etc. agreed with client FM team

6.4

HOLES IN SLABS STAIRS, SERVICE DUCTS, LIFTS FALLS THRU FLOORS

Cast-in sleeved services where possible prevent large holes being formed.

Perimeter ducts designed rather than in open floor areas & temporary mesh protection built in

Mesh cast in large duct holes

Specification to recommend hole protection regime to be advised and costed by contractor. Temporary staircase balustrading to be provided.

All large scale holes and ducts will be shown on drawings but smaller services holes will be on subcontractor drawings.

Contractor to ensure appropriate methods of protection available at all times

CONTRACTOR to identify preferred solutions for hole protection.

Cantilevered in –situ stair to central area











6.5 CONCRETE PAVING, BLOCKS AND PAVIORS

CUTTING METHODS CREATING DUST

RESPIRATORY ILLNESS AND DISEASE

Respiratory diseases caused by dust creation

Blocks , paving and paviors cannot be eliminated as they are a design requirement

Minimise cutting by design of paving and block layouts and use of standard special blocks or Bespoke specials Block splitters to

be used where possible

Cutters where not, but with dust suppression or vacuum attachments

Design drawings to highlight layouts and specifications to recommend mechanisation to allow contractors to price for appropriately safe methods.

Respiratory Signage on site and site work task drawings

CONTRACTOR to also identify Musculo-skeletal issues and protect against

Hearing loss, Eye protection etc. to be considerd

6.6 BLOCKWORK DETAILING TO AVOID RESPIRATORY, NOISE AND DUST ISSUES

Blocks are essential for modern construction but elimination or avoidance of unnecessary cutting

Avoid unnecessary cutting of blocks by good detailing

Blockwork for acoustic or structural reasons can be too heavy for repetitive hand laying . Alternative design or mechanisation required. Avoid details that need cutting where possible. Possible that all blockwork could be avoided, for boarded systems.

X

http://www.archersafetysigns.co.uk/prod-detail.asp?id=6&a=700&b=799&prodid=5132




































6.7

STAIRCASE INSTALLATION

SAFE WORKING AT HEIGHT

Avoid WAH risks by staircase prefabrication

Design team to simplify and rationalise stair design for repetition

Weights and sizes to be provided for coordination with prefabrication specialists No need for temporary stairs Finishes added later or protected Permanent handrails to not conflict with temporary

Early installation of stairs provides safe, permanent construction access for operatives

Precast Concrete or Steel Offsite fabrication Speed of construction Cost and programme savings Repetition & simplification of design Lifting on site Temporary edge protection designed in

Draft stair design details

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