Frequently Asked Questions

Design and Procurement

> What is the InQuik system?

InQuik modular components comprise of pre-fabricated formwork and reinforcing that is simply placed on site and filled with concrete to create a fully in-situ cast concrete bridge structure. The current InQuik product range includes deck panels (6, 9, 12, 13.7, 16 & 18.5m spans), abutments, wing walls, headstocks and bladepiers.

> What is your maximum span?

The maximum single span currently offered is 18.5m. We do offer multi span options using the InQuik headstock to build bridges >24m.

> How heavy are the components?

Without concrete, a typical 12.1m span, 2.44m-wide panel is 4.2–5t. The standard abutment for a single lane bridge weighs ~1.2t, and the standard wing walls are ~0.5t each.

> Is the bridge a concrete bridge or a composite bridge?

The bridge is made of steel reinforced concrete, and the 100-year design life is achieved by using 40 MPa concrete, or 50 MPa in a coastal environment (B2 classification). It does not use composite material, nor is it fibre reinforced.

> What is the connection detail between the bridge deck panels?

Steel reinforcing tie bars supplied by InQuik are used to connect the panels.

> What certification do you give?

The bridge designs are certified by SMEC to AS5100 (2017) standards, and this documentation can be provided upon request. We certify the standard deck and abutments, with the global bridge design and foundation design completed and certified by others.

> Does the system comply with AS5100?

The system has been designed and certified by SMEC to comply with the Australian Standards – Bridge Design AS5100 (2017) requirements, including SM1600 and HLP (Heavy load platform) 320 and 400 loadings – as required.

> Are there any traffic volume limits on the bridge?

As the bridge deck is designed to AS5100 standards, and the deck is one homogeneous slab with no deck joints, there are no traffic volume limits other than as defined by the bridge width (which has variable AADT according to state standards).

> What is an Integral bridge?

An integral bridge is one that has structural continuity between the deck and structural elements that support it. This fully continuous moment connection between the superstructure and substructure at the abutments eliminates the need for joints or bearings to accommodate rotations and displacements at the ends of the deck.

> How does the InQuik integral bridge design work?

As the deck and abutment components are filled with concrete on-site, provision can be made to integrate them together through a reinforced concrete connection to form a solid single homogenous mass of concrete. This creates a stronger, more robust structure, requiring zero maintenance and reducing long term inspections.

> What details are provided if I am designing a bridge with the InQuik system?

Standard technical details will be provided, as well as basic CAD style drawings for the bridge components upon request, to allow them to be incorporated into your bridge designs.

> Who can I work with for site specific design?

InQuik can put you in touch with certified and reputable designers for projects of any size.

Transport and Delivery

> What is the typical lead time from order to delivery?

After the bridge designs are finalised and the supply agreement is in place, standard componentry can be provided ex factory in 6–8 weeks.

> Where is the system made?

Our current fabrication facilities are all ISO accredited and we have 2 facilities in Newcastle, NSW and another in Eagle Farm, QLD. We use Australian produced reinforcing and locally sourced components.

> How many components can be transported on one truck?

A typical single lane, single span bridge can be transported on one truck, which includes 2 deck panels, 2 abutments with Wing Walls and the appropriate connection pieces. It is possible to transport 4 standard deck panels stacked on each other, on one truck. Standard panels will fit on a regular semi-trailer, with no need for wide/long load escort requirements.

Installation and Constructability

> How long does it typically take to install an InQuik bridge?

The “place and pour” methodology means that an InQuik bridge can be installed in 2-3 days over a total project timeline of 1-2 weeks.

> Does it require any propping?

The abutments and bridge deck are fully self-supporting, and should not require any external props at any point in the construction process. However, the abutments and wing walls should be checked to ensure they are level to the base, and braced if required.

> How do you supply abutments with wing walls?

The abutments and wing walls come as a single component and are placed on the blinding layer.

> Do you need to do any post tensioning or transverse stressing?

The reinforcing cage in the panels is designed to be fully structural on its own, without the need for any post-tensioning or transverse stressing.

> Is concrete cover assured?

The InQuik patented design and welded reinforcing cage ensures guaranteed concrete cover between the reinforcing and formwork and it’s a fully in situ poured concrete bridge.

> When filling the abutment with concrete, how high can you pour in one go?

The maximum height that can poured in one go is 2m. Please refer to the InQuik installation guide for full details.

> When filling the headstock with concrete is this one pour?

Our standard headstock design is 1.0m high, and 1.2m wide. Concrete would be installed in 2 pours: first 600mm, let set to 25MPa, then the final 400mm.

> How do I tie down the deck to the headstocks?

Each deck panel has provision for 2 tie-down points on both ends, which are rated at 10 kN each. We can provide tie-down bolts if required.

> What type of crane is required to install the InQuik parts?

As the InQuik components are much lighter than precast sections, they can be installed using a crane or Franna, with the necessary load capacity. Our top down installation mitigates safety and WHS risks.

> After the concrete is poured, how long until it can take traffic?

Both the abutment and the deck are designed to use 40 MPa concrete. Once this has reached 30 MPa, it can take up to 150 vehicles per day. The time to reach this state depends on site conditions and weather, but is typically around 7 days. The concrete typically reaches 40 MPa after 28 days, upon which traffic volumes are unlimited.

> How much concrete does an InQuik bridge use?

This depends on the specific design of the bridge. A 12.1m span dual lane – 7.2m wide bridge with 1m high abutments would take about 53m3 of concrete. A standard concrete truck can take ~6 m3 of concrete, meaning that this bridge would require 9 standard trucks.

> How long does the abutment need to cure before the deck can be placed?

The deck cannot be placed and filled with concrete until the compressive strength of the abutment has reached 20 MPa. Installation process would be to firstly place abutments and fill with 40MPa concrete, next day place the deck panels and tie the reo and lastly fill the decks on day three.

> How long does it take to install the InQuik parts?

The time to install depends on how many people are working on-site, the complexity of the bridge design, and the speed and preferences of the installer. For example, it is possible to install the abutments with wing walls and pour and finish the concrete in one day, but an installer may prefer to place the parts on one day, and then pour the concrete on another day. The “place and pour” methodology means that an InQuik bridge can be installed in 2-3 days over a total project timeline of 1-2 weeks.

> Do I need steel certification for onsite reinforcement work?

No, steel certification is not necessary. All the reinforcing steel is certified by the Australian Reinforcing Company (ARC), and only minor work is necessary on-site, provided the installation is done as per the InQuik installation guide.

> How do I know how to install the InQuik bridge? Do you provide installation support?

We provide detailed installation guides upon request, and we attend each installation.

> How am I supplied the Engineering certificate upon project completion?

We supply the certificate and MDR upon receipt of the installation checklist which is submitted to InQuik.

Safety in Design – Whole of Life Costs

> How does InQuik reduce Whole of life costs?

The InQuik Integral design has no bearings, tie downs, bolted connections, longitudinal joints or grouted joints, this ensures zero structural maintenance over the 100-year design life.

> How easy is the bridge to clean (eg: graffiti)?

The steel formwork makes it easy to clean the bridge using standard solvents, as the smooth steel is not absorbent. Note that certain chemicals may react with the steel coating (eg: Zinc or Magnelis), so care should be taken to avoid staining the surface.

> How does InQuik address Safety in design?

*The Victorian Occupational Health Act 2004 places general duties on VicRoads to provide a safe workplace and a specific duty on Designers to ensure that the structures they design are safe and without risk to the health of persons using them as a workplace so far as is reasonably practicable. For this reason, the integral bridge form of construction is the most preferable form where it is suitable.

* BTN010 January 2018 – Integral and semi-integral bridges states VicRoads’ requirements
for the design of integral and semi-integral bridges.