Smart Paving with Wirtgen Offset Paver SP 15
The Mega port in Tuas is one of Singapore’s ambitious projects that will play a role in shaping the future of the country. Many roads and infrastructure need to be implemented to support this major development once it is fully operational. To begin with, roads have been planned and built in Tuas South, for the construction of a container ramp to access buildings.
Jurong Town Corporation (JTC), who manages such industrial projects, has signalled the use of machines to optimize the construction process and to increase productivity. One of these projects has been awarded to the main contractor Quek and Quek Civil Engineering Pte Ltd.
The company contacted Wirtgen Singapore to discuss the possibility of using a Wirtgen slipform paving machine for its road construction project in Tuas South. After a few meetings and presentations to JTC and to the consultants, both companies came to the mutual agreement to jointly carry out a project trial using the AutoPilot system and to train the paving crew.
A Wirtgen’s offset slipform paver model, the SP15, was chosen for the trial. This machine is capable of paving concrete curb at above 1m/min pending a sufficient amount and the right mix of concrete are supplied to it. With the Wirtgen AutoPilot system, there is no need for a stringline set-up neither for formwork as in traditional methods, which in turn saves time and avoids overburdening of the surveying team in the process.
AutoPilot System: Paving monolithic profiles without string lines
The AutoPilot system enables a surveyor or any paving crew member, to create a virtual stringline with a Field Rover by marking out the stake points that the SP15 will follow while slipforming curb and base to the specified dimensions required by LTA (Land Transport Authority). The advantages of the AutoPilot system include ease of use and ability to correct the line of travel automatically.
Using the AutoPilot and intelligent drive system, the traction, height and steering of the slipform paver are always maintained. This leaves the main operator to focus on controlling the rate of concrete to supply to the mould and the vibrators’ frequency on the concrete mix, thus ensuring that a high-quality concrete finish is achieved during paving. This successful trial has given Quek and Quek Civil Engineering the confidence to participate in similar projects in the future.
It was necessary to conduct some trials to fine-tune a workable mix design and vibrators positioning. Ready mix suppliers were invited for discussion and to provide their proposed mix design during trials. The main challenge was to get the right slump as Singapore’s climatic condition, distance of concrete plant to the jobsite and source of raw materials are varying, explained Wirtgen. However, after several attempts a workable mix was agreed upon.
There were a number of trials conducted between August and October 2017, after which Phase 1 of the project began and was finally completed in January 2018. Despite the difference in design of the drop inlet chambers versus K2A curb and base design, only some manual work was required to insert the drop inlet chambers into place.
For further information, please contact:
WIRTGEN SINGAPORE Pte. Ltd.
No. 5 Tuas Avenue 18 A