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N1 Pipe Bridge: Pretoria (South Africa)

Introduction

IBRCD Joint Venture, comprising Basil Read, Roadcrete Africa, DipCivils & Chavani, were awarded the contract to carry out improvements to National Road 1, Section 21: Atterbury to Scienta (N4) interchange. This forms part of the GFIB works packages section D. Borecut was selected to be part of the team for the systematic demolition of the existing Lynnwood Glen pipe and pedestrian bridge spanning both highway carriageways. The pipe and pedestrian bridge structure is unique in that it is 2 separate bridges encapsulated in single abutments. Each of these bridges has “tension bearings” in the abutments which produce a negative cantilever effect over the central column, thus decreasing the mass and increasing the slenderness ratio outside the normal design parameters for similar structures of this span and nature.

Cutting 700mm Deeep using 1.5m blade...

Diamond wire sawing...

THE presence of 6 no x 65mm diameter stressing cable ducts running from one abutment, through the bridge to the other abutment, made the cutting process an essential yet very sensitive and critical process. Due to the uniqueness of the existing structure, the critical water services, the critical time constraints for design and construction, and the aesthetically appealing result that the client requires for the soccer world cup, this challenge has certainly kept this excellent team busy.

A 1.5m saw blade was used to cut one section, while the diamond wire saw was used to cut the other. Both cuts were completed the same time while a 300 ton crane removed each section with ease. The bridge was removed within 2 days from start. Traffic was diverted to ensure the safety of the public, and while each section were being removed traffic was stopped completely. Borecut could not afford any mistakes as this would delay the job and cause traffic jams on the N1. Thanks to the Metro Police this wasn’t a problem.

Wire Sawing Each Section

 


Download case study here.

 

Testimonials

  • "If you want an easy or difficult cutting or coring job done Safely, Proficiently, and at a fair price call in Borecut. Most of our construction involves sudden unexpected additions and Borecut have often done their bit to save the day mostly under plant operating conditions which in itself is a challenge."

    Martin du Rand - Director Stefanutti Stocks

  • "Borecut has been our concrete cutting company of choice for over 20 years because of their ability to complete any size shutdown with enthusiasm, speed and professionalism"

    Christo Hattingh - Mittal Steel

  • "Many times our clients, require new or additional openings to be cut out in reinforced concrete. With many years of experience working together, Borecut understands that prompt, professional service is important to our clients and us"

    S. De Boer - Concor

  • "When it comes to concrete Cutting and Drilling Borecut remains the best in the industry. They are reliable, accurate, and always have the best and most economical solution to any challenge"

    Wayne van der Westhuizen
    Site Agent
    Group Five Civil Engineering (Pty) Ltd