BIM at LSHWhy we use Revit software

Pressures for change

•Concerns about poor quality and coordination of drawings using AutoCAD

•Experience of staff using BIM software elsewhere

(Currently no client require BIM)

Staff Preference

•BIM is more fun

- staff who have learnt Revit don’t want to go back to 2D CAD

It works

•Potentially more efficient than 2D CAD

•Better visualisations

•Clients love 3D

•Better construction documentation

•Better coordination on site

BIM at LSHFirst projects in Revit - 2008

Slingfield Mill Kidderminster

First Revit project on site

•An extension to an existing building

- not an ideal for beginners

•A lot of 2D drafting

-existing elevations etc.

Substation Kidderminster

First proper 3D BIM project

£30K

•A small start

Pioneer Square Bicester£38M - First large project using Revit

Pioneer Square Bicester£38M - First large project using Revit

cinema

Sainsbury's

shops

shops

bus interchange

car park

Pioneer Square Bicester£38M - First large project using Revit

Pioneer Square BicesterSainsbury’s fit-out

Pioneer Square BicesterSainsbury’s fit-out

•No BIM requirement from client (though Sainsbury’s now beginning to implement Revit)

•Local Authority Development competition

•Submitted for planning in 2007

•Redesigned in 2009 to suit downturn in property market

•LSH the only consultants using BIM

•Single stage D&B procurement

•Was it BIM, little BIM, lonely BIM or what?

- well it was building information modelling

- schedules produced from model

- specifications linked to model

- model exchange with steelwork fabricator and other metalwork subcontarctors

Pioneer Square BicesterFirst large project using Revit

Model split into 3 buildings/zones + site plan

Pioneer Square BicesterProject organisation

Cinema & Retail

Sainsbury’s store

Ancillary buildings

Site

Modelling in 3DOver 300 drawings produced from 4 files

DocumentationOver 300 drawings and schedules produced from 4 files

Communicating Ideas3D modelling used to develop and communicate ramp circulation

Coordination and Collaboration ackagesAn attempt to use a CAD/BIM Protocol

CAD/BIM Protocol issued by LSH for consultant team to follow

•File naming

•Coordinate system

•Exchange of source files (2D & 3D model data) – not annotated drawings

CAD/BIM Protocol not followed by consultant team

•Fellow consultants could not grasp the concept

•Still sent bound DWGs which include other parties’ information

Subcontractors ?

•A few worked in 3D BIM (Tekla)

•Some issued standard details ignoring our information – lifts and travelators

•Some started with a blank CAD file re-drew our information and made mistakes

Coordination and collaborationWhy can’t we learn to collaborate better

CPIC Production information: a code of procedure for the construction industry

Published in 2003

‘Necessary changes to the management of the design process have not

been made; in consequence CAD systems are not being used to their full

potential, invariably being used as little more than electronic drawing

boards...

At present most production drawings are produced using conventional 2D

CAD systems, but despite this the inadequacies of the manual method

remain..’

Coordination and collaborationWhy can’t we learn to collaborate better

New guidance – hope for the future?

Guide to

BS 1192

PAS 1192-2

CPIC

BIM Execution Plan

+

Assessment forms

CICBSI

BIM Protocol

+

Appendices

Information

manager role

Coordination with subcontractor packagesLSH design - Travelators in scissor arrangement with central supports

Coordination with subcontractor packagesLSH design - Travelators in scissor arrangement with central supports

1 support position

per level

Coordination with subcontractor packagesSubcontractor’s drawings – no context & supports do not work with scissor arrangement!

4 support positions

per level

Construction stage IFC ExchangeBIM models exchanged with key subcontractors for design development and coordination

issued model

model issue sheet

Construction stage IFC ExchangeIFC exchange assisted coordination of steelwork package

steelwork model

model coordination review

architectural model

Construction stage IFC ExchangeIFC exchange assisted coordination of steelwork package

IFC Free viewers used by team members – but not the contractor!

Construction stage IFC Exchange

Issues

• Revit IFC import / export a bit flaky but improving

- IFC import placed elements in wrong categories

• No control over Coordinate system for export

-Shared / world coordinate system exported, whereas Steelwork fabricator used local coordinate system

• No exporting of grids etc.

• Smaller subcontractor packages – couldn’t export cutaway sections of the model so subcontractors

didn’t use our model

• Some subcontractor models based on site surveys, so there was a tolerance issue importing them

back into our model

Using BIM Software

What we learnt

• IFC exchange works

• BIM does not replace the need for good communication between team members

- Telephone calls and emailed screenshots play a vital role in coordination alongside regular

model exchange

• Regular exchange of work-in-progress models very important

- design is an iterative process

• The model is the key reference – fudges are counterproductive

- We ended up modelling a lot of the substructure and doing some of the structural engineers’ work

- Draw details on top of the model – don’t hide the model

Design Development – use of BIMRevit used from Planning through to completion – improved visualisation

1. View of structure within REVIT

model2. Wireframe view within REVIT model

3. Exported colour view from REVIT

4. CGI marketing render

5. Photograph of completed scheme

Revit – to 3D Studio MaxCustomer Journey Animation from BIM model

Revit – to 3D Studio MaxCustomer Journey Animation from Revit model

CompletionPromotional video