Contact us About us News far fa-map-marker-alt Find a Branch far fa-phone-alt 13 15 52 far fa-user-alt Coates Connect far fa-shopping-cart Hire Now

Equipment for Hire

Access Earthmoving Lift & Shift Site Accommodation Air & Air Accessories Floor & Cleaning Lighting Tools & Equipment Compaction Generators & Power Distribution Materials Handling Traffic Management Concrete & Masonry Heating, Ventilation & Air Conditioning Pipeline Testing Trucks Vehicles & Trailers Confined Space Entry Ladders & Scaffolding Propping & Structural Support Water Management & Pumps Construction Lasers Landscaping Shoring Welding
Equipment for Hire
Access Earthmoving Lift & Shift Site Accommodation Air & Air Accessories Floor & Cleaning Lighting Tools & Equipment Compaction Generators & Power Distribution Materials Handling Traffic Management Concrete & Masonry Heating, Ventilation & Air Conditioning Pipeline Testing Trucks Vehicles & Trailers Confined Space Entry Ladders & Scaffolding Propping & Structural Support Water Management & Pumps Construction Lasers Landscaping Shoring Welding View all

Engineering Solutions

Design & Installation Water Management Structural Support Traffic Management BIM Library
Engineering Solutions
Design & Installation Water Management Structural Support Traffic Management BIM Library View all Engineering Solutions

Industrial Solutions

Site Management Equipment & Services Technology & Innovation Industry Sectors
Industrial Solutions
Site Management Equipment & Services Technology & Innovation Industry Sectors View all Industrial Solutions

Power & HVAC

Power Heating Ventilation Air Conditioning Compressed Air Service and Support
Power & HVAC
Power Heating Ventilation Air Conditioning Compressed Air Service and Support View all Power & HVAC Solutions
fas fa-bars Access Air & Air Accessories Compaction Concrete & Masonry Confined Space Entry Construction Lasers Earthmoving Floor & Cleaning Generators & Power Distribution Heating, Ventilation & Air Conditioning Ladders & Scaffolding Landscaping Lift & Shift Lighting Materials Handling Pipeline Testing Propping & Structural Support Shoring Site Accommodation Tools & Equipment Traffic Management Trucks Vehicles & Trailers Water Management & Pumps Welding View all BIM Library Design & Installation Structural Support Traffic Management Water Management View all Engineering Solutions Equipment & Services Industry Sectors Site Management Technology & Innovation View all Industrial Solutions Compressed Air Heating Ventilation Air Conditioning Power Service and Support View all Power & HVAC Solutions far fa-shopping-cart Hire Now far fa-user My Coates Hire far fa-map-marker-alt Find a branch far fa-phone 13 15 52 Contact us About us News

High-capacity hydraulic shoring backed by in-house innovation

Keller turned to Coates when it needed a high-capacity internal bracing solution – find out why

 

The project

Work is underway at Bowline Wickham, a luxury residential development being constructed by Eastern Pacific alongside the Newcastle Interchange, a major transport hub serving the city, in NSW. Due for completion in 2024, the 16-storey development will feature commercial and residential lots.

In early 2022 Coates was engaged by civil works and retention specialist Keller to provide an internally braced retention solution for Bowline’s 3-level basement structure.

The challenge

The shoring solution for this large basement excavation was determined by the site’s size, location and ground conditions.

Supporting high structural loads

Bowline is situated close to the Hunter River, resulting in poor soil stability and a naturally high water table. Excavating the southern half of the basement to a depth of 10m in these conditions - an area of approximately 42 x 25m - created high loads for the internal bracing and additional water management challenges for Keller.

“We needed a high-capacity lateral support system, and as Coates’ proprietary system is one of the largest capacity solutions available on the market, they were a good fit for delivering this solution,” says Eric Lin, Design Engineer for Keller.

A hybrid approach to shoring

Ground anchoring under neighbouring properties was Keller’s preferred option, to provide clear spacing within the basement with minimal obstruction to work around. However, this was not possible on the southern boundary due to the adjacent rail asset. “To safely excavate close to the rail corridor and interchange, Keller needed a solution that could utilise both ground anchors and internal bracing,” explains Coates Temporary Works Design Engineer, Jorge Valencia.

Maintaining low deflection

Design criteria issued by Transport for NSW required the basement retention system to achieve deflection of 20mm or less throughout installation, excavation and construction. “This required high-capacity support and the ability to apply pre-load,” says Jorge. “Keller also needed to be alerted quickly if the deflection deviated outside of this range.”

Capping beam step

Accommodating a 1.1m step in the capping beam level from one side of the excavation to the other was another significant design challenge for the project team.

telemetry-enabled system

A telemetry-enabled system allowed Keller to monitor displacement at all times

The solution

Keller designed an anchored retention system for the northern half of the excavation and collaborated with Coates to design a 2-level wirelessly monitored internal bracing system for the southern half. The design incorporated a range of bespoke technologies and innovations:

  -  The top level feature 7 x MP150 and MP250 standard and Super Tube hydraulic struts connected to the capping beam. Coates designed and fabricated custom end bearing plates to connect three of these struts to the capping beam in the southwest corner to achieve the necessary angle and rotation to accommodate the 1.1m capping beam step.

  - On the lower-level, Coates’ proprietary HW500 waler was fitted to the retaining wall, supported by a further 7 struts. This heavy-duty modular waler system was developed by Coates in response to growing customer demand for high-capacity structural support and used here for the first time.

  -  Coates’ new MP375 hydraulic ram was also used on four lower-level struts. With a considerably thicker wall than the MP250 ram, the MP375 is the highest capacity double-acting hydraulic ram available in Australia.

  -  The 914 tube is another solution custom developed by Coates for this excavation. With an outer diameter of 914mm, these tubes were applied to three lower level struts, allowing greater loads to be supported between the MP250 strut sections and the Super Tubes. This proved particularly useful for longer struts, where space for the Super Tubes is limited.

HW500 waler system and MP375 strut

The MP375 strut connected to the HW500 waler system

The impact

Working with Coates Engineering Solutions was a positive experience for Keller. “Coates were professional, proactive and able to respond quickly to questions and provide the support that we needed,” says Eric.

Understanding shoring system performance

The use of telemetry sensors allowed Keller to accurately measure the displacement and rotation between the two ends of the props. “In conjunction with other instruments and survey monitoring, Coates’ solution provided a good indication of where the movement was in the wall and created a much clearer picture of how the whole system was performing,” says Eric.

Consistently reliable support

Using Coates’ hydraulic struts instead of prefabricated steel struts improved the performance of Keller’s basement retention system. “You can normally fabricate sections to the right size with made-to-order steel propping systems. The downside is that you can’t pre-load these sections,” says Eric. “But with Coates’ hydraulic shoring system, pressure can be pre-loaded during installation to support the wall and minimise deflection.”

Ease of installation

The modular design also saved Keller time during transportation and installation. “Compared to the anchoring that we installed at the northern end of the site, installing Coates hydraulic shoring solution seemed quite quick and straightforward,” says Eric. “Despite the need to brace from within the excavation, it was also reasonably easy to work around.”

Connect with Coates’ Engineering Solutions team to find out how Coates can improve the cost efficiency, reliability and safety of your next excavation.

SHARE THIS ARTICLE

{{ socialIcon(api.type) }} {{ socialIcon(api.type) }} {{ socialIcon(api.type) }}
Find out how we can help with your project fas fa-phone-alt CALL US 13 15 52 Submit Enquiry

By submitting this enquiry you agree to Coates's Communications Terms & Conditions

Give us a call
fas fa-phone-alt 13 15 52 fas fa-check Australia’s largest fleet fas fa-check National branch network fas fa-check Friendly & reliable service fas fa-check End-to-end solutions
far fa-times-circle Your enquiry has been submitted

Thank you for your enquiry. One of our team members will get back to you as soon as possible.