Roy Lengweiler

Technical & Construction Expert in Arbitration of Stonecutters Cable Stayed Bridge, Hongkong, Maeda Hitachi Yokogawa Hsin Chong Joint Venture, expert reports for cantilever construction, stay cable adjustments and heavy lifting of 2000t pier-tables (parttime assignment, since April 2014 - ongoing )

Doha Metro - Red Line North Elevated, contract value USD 700Mio. It is a Design and Build project consisting of 2km elevated viaduct, 2km at grade, 2km cut and cover section and 2 stations. Interim leader for the start up and organisation of the design and engineering team for RLR JV. Coordination with Client Qatar Rail, Engineer, Architects, Designers, MEP.

Initial 6 months involvement was extended to total 13 months.

Technical construction services and tender support to contractors mainly overseas in Asia Pacific.
BRIDGELAB, founded in 2003. I am one of the 4 founding members. (www.bridgelab.ch)

Senior Project Advisor for the main contractor JV on consultant basis for 10km long Jamal Abdul Nasr Expressway, which is built by precast segmental span by span method.
Multiple trips and several months in HongKong for Coordination with JV’s Designer. Initial Agreement for 6months was extended to 18months

Construction Expert Witness at High Court in Kuala Lumpur, Malaysia for the Sungai Prai Cable Stayed Bridge and Viaducts.
Study of project drawings and documents, preparation of expert reports, presentation and witness hearings in the High Court in Malaysia.

Member of the main contractor's project management team for SHEIKH ZAYED BRIDGE. The project management team consisted of 4 senior staff.

This signature bridge, designed by the famous architect Zaha Hadid is the third crossing to Abu Dhabi Island with a construction cost of USD 300Mio.

Responsible for the daily management of the project.
Inquiries, evaluations, major sub-contract agreements, contact with Client and Engineer, site organization and staffing, coordination and supervision.
Responsible for the technical departments : Methods, Temporary Works and the Permanent Design Departments. The extensive construction engineering, permanent and temporary works design was all carried out on site.
Management of arches fabrication and erection and of all the specialist works (e.g. post-tensioning and hangers)

Interim construction management.

Closing of project, as built documentation.

Member of the main contractor's project management team for SHEIKH ZAYED BRIDGE. The project management team consisted of 4 senior staff.

This signature bridge, designed by the famous architect Zaha Hadid is the third crossing to Abu Dhabi Island with a construction cost of USD 300Mio.

Responsible for the daily management of the project.
Inquiries, evaluations, major sub-contract agreements, contact with Client and Engineer, site organization and staffing, coordination and supervision.
Responsible for the technical departments : Methods, Temporary Works and the Permanent Design Departments. The extensive construction engineering, permanent and temporary works design was all carried out on site.
Management of arches fabrication and erection and of all the specialist works (e.g. post-tensioning and hangers)

Interim construction management.

Project Manager on hehalf of BBR Systemd Ltd. for RAMA VIII Cable Stayed Bridge, Bangkok for BBR in joint venture with China State and KPV

The Rama8 Cable Stayed Bridge in Bangkok is an asymmetric cable stayed bridge with 300m main span, supported by 84 nos of stay cables. The deck width is 28.5m wide and steel - concrete composite.

Responsible for the set up of BBR’s project operation in general and on site. Recruitment of personnel in Thailand, which was necessary to carry out this first large contract of BBR in Thailand. Managing of project together with the PM’s of the other JV partners.
Representation of the company with all the responsibilities given by the main-contract and as a fully liable partner of the multinational Joint Venture (Chinese - Thai - Swiss).

In 2002 responsible for the tendering of new major projects in Bangkok making use of the established team on site, which led to the award of the IRR Contract 3, a 1’300m of 26m wide viaduct by Jan. 03.

Wadi Leban Cable Stayed Bridge, Riyadh
This pre-cast segmental cable stayed bridge with 405m main span, supported by 124 pairs of stays in central plane. The road deck is 35.5m wide, 763m long and 80m above ground level. The pylons are extending 90m above deck level.

Responsible for the segmental deck erection. Controlling of technical office, erection group, ground team, and abutment group. Assistance to PM and replacement during his absence.
Main Achievement: Alterations and improvement of erection sequences and cycles based on detailed knowledge of construction analysis, which I carried out in period 94 to 96. This allows for consistent 4-day erection cycle and enabled completion of project 4 months ahead of the January 98 schedule

Technical Manager Barelang Projects (BATAM-TONTON CSB, TONTON-NIPAH FCM), VSL International Ltd., Bern, Switzerland

Barelang Projects, Indonesia
Bridge #1: Batam-Tonton Cable Stayed Bridge (147m-350m-147m) Bridge #2: Tonton-Nipah Cantilever Bridge (40m-90m-160m-90m-40m)

Engineering scope of VSL: Construction Analysis & Engineering. Design of Travellers for both bridges. Stay Cable Engineering, Methods, Temporary Works. Position: Technical Manager Barelang Projects, VSL International Ltd.
- Responsible for Technical Office on site (5 engineers and 3 draftsmen).
- Coordination & implementation of construction engineering, i.e. geometry control, erection sequences, monitoring of stay cable forces etc.
- Technical supervision of climbform assembly, operation and dismantling incl. method statements / formwork design pylon head.
- Technical supervision of traveller fabrication, commissioning and operation.
Stay cable fabrication, installation and stressing.
- Design of temporary works, method statements.
- Assist production with alternative methods and designs to reduce costs and construction time.
- Assist main contractor in his own temporary works and methods.
- Training of local engineering & drafting staff
- Technical representation on site towards contractors and client.

Batam-Tonton CSB
Stay cable bridge with 350m main span. Stage by stage analysis, determination of the stressing sequence and final tuning of cable forces.

Phu Luong FCM, Vietnam
Construction engineering of the in-situ balanced cantilever construction, consisting of 3 cantilevers with 100 m spans. Stage by stage analysis. Check of the stresses in the girder and determination of the precamber curve and control lines. Erection manual. Technical know-how transfer to client and main contractor for the first FCM-bridge built in Vietnam. Training of Consultants with bridge design software. .

Hong Kong
Training of Design Team with finite element software for the design of post- tensioned floor systems. Design of various post-tensioned slabs and transfer plates.

Wadi Leban CSB, Saudi Arabia (ca. 16 months)
Responsible for construction engineering of pre-cast segmental stay cable bridge with 405 m main span.
- Stage by stage analysis as the construction proceeds, determination of the stressing sequence and final tuning of cable forces.
- Design of the temporary pre-stressing arrangement.
- Check of stresses in pylon and girder during construction.
- Precamber calculation.
- 3D Finite Element Analysis of selected girder portions.
- Assignments on site in Riyadh for engineering problems related to the segment casting, construction method of pier table and first segment erection

H3 Viaduct, Hawaii
Camber calculations and check of construction stages of superstructure and launching of girder for 1st frame.

Taxiway No.3, Hong Kong
Analysis and detail design of precast post-tensioned girders carrying B747 jets. (40m spans).

Evripos Stay Cable Bridge, Greece
Analysis of stay cable stressing procedure. Method Statement for single strand installation and stressing

Norwegian Contractors, Oslo
Member of the Special Investigation Team for the 2nd Sleipner A platform for 7 months after accidental loss of Sleipner A1. Verification of the ring beams and design of the top shafts using the compression field theory.

Assistance for the design of pre-stressing of the worlds first floating platform in light weight concrete, pre-stressing layouts in different parts of the structure, design of blister zones, acceptance tests of anchorages, design of rock anchors for the shafts.

Stoerebaelt, Western Bridge, Denmark
Review Engineer for final design in Amsterdam at Ballast Nedam.

Ashan Bay Bridge, Korea
Conceptual and preliminary design of the 7 km long bay crossing stay cable bridge for design competition. Pre-cast and externally post-tensioned approach spans.

Song Gianh Bridge, Vietnam
Proposal for river crossing erected by the free cantilever method.

Bouygues, Paris
Preliminary design work for Northumberland Crossing in Canada, studies on the stay cable navigation span. Alternative tender design for ‘Viaduct sur le grand canal du Havre’ (240 m cantilever main span).

Design and technical construction supervision of the following projects :

High School Switzerland: Foundations, structural frame, slabs, post-tensioned girders, structural-steel trusses.

Warehouse, Gossau, Switzerland: Anchored diaphragm walls, post-tensioned mat foundation, post-tensioned slabs.

Bus Depot, St. Gallen, Switzerland: Pile foundation (up to 400 t), post-tensioned slabs and transfer girders of 50 m span, space frame roof system in steel.

Bridge over Steinach, St. Gallen, Switzerland: Diaphragms, transverse design, site supervision.