CASE STUDIES

New Zealand

Meccanico_0420

NX2 - Fletcher / Acconia, 1400 Tonne Bridge Jacking

The ‘Ara Tuhono: Puhoi to Warkworth’ project

Moir Hill Road bridge
(Warkworth)

Situation
The ‘Ara Tuhono: Puhoi to Warkworth’ project, a 4-lane extension (18.5 km) to the Northern Motorway (SH1) from the Johnstone’s Hill Tunnels, at Puhoi, to tie-in with existing SH1, north of Warkworth, to improve the safety and connection between Northland and other parts of the North Island (Auckland, Waikato and Tauranga). Part of this project is the Moir Hill Road Bridge (weight: 1400 ton), one of the in total 7 bridges during the project.

Challenge
Meccanico, New Zealand’s specialist in heavy lifting and levelling operations, needed to lift and hold the Moir Hill Road bridge 4 mm, so the bearings could be repaired. The lifting took places in increments of 1 mm and every step the weight was monitored via a screen. This handling was required at both ends of the bridge. After completion of the bearing adjustments to the abutment of the bridge, the bridge had to be lowered back onto the bearing.

Solution
To ensure safe and controlled lifting, lowering and levelling of bridges and other heavy properties, Meccanico used a flexible, easy to handle and extremely accurate synchronized lifting system. Because complex lifting procedures also often require ‘tilting’, this feature was a ‘must-have’ in the system.

In 2017 Holmatro had developed a 2,000 ton synchronized positioning system for Meccanico with the option to determine the center of gravity (COG) and be able to weigh the load if necessary. The system is equipped with 6 double-acting pump units, each with 4 individual oil flows for all the 24 lifting points. Due to the modular set up of the system, the pump units can be placed around the object and then connected together. Thanks to this set up, the distance from the pumps to the lifting points can be kept equal and limited to the bare minimum. This results in much more stable lifting and lowering with significantly less vibration. The modular set up also provides huge flexibility; the system is easy to control and move around, without the need for any additional equipment such as a crane or fork lift: A major benefit on job sites where access is difficult and cranes cannot get access.

The pumps are linked together by means of a data cable that is connected to a portable HMI (Human Machine Interface) complete with touchscreen. The software on the system allows the user to set the exact parameters required to execute a complex lift. Should something fall outside of the given parameters (for instance an unexpected shift in weight) the system automatically stops the lift, so that the user can safely check and secure the object before recommencing the lift.

Due to the double-acting cylinders, the user has maximum control both on the lifting and the lowering action as gravity is not relied upon to lower the load.

Holmatro’s synchronized positioning system can easily be up-scaled by adding more pumps and cylinders, giving it an almost unlimited capacity in terms of lifting, lowering, levelling and weighing.

This makes the synchronized positioning system flexible and multi-usable in various applications and projects, like another Meccanico application; the lifting, lowering and levelling of earthquake-damaged properties.

Ribraft Slab Re-level

Wroxton Terrace
(Christchurch)

This Fendalton home had a ribraft foundation that was out of level.

Because of its foundation type, it was the perfect candidate for our synchronised, computer controlled, levelling system. After set up the home was returned to target levels within 30 minutes.

Strengthening & Full Refurbishment

Sudima Hotel
(Christchurch Airport)

The scope of the project required full strip out, re-strengthening and refurbishment to be completed in just four months. The hotels Lincoln wing and Roosevelt wing were damaged from the main February 2011 earthquake. New foundations, block walls and structural steel were installed to bring the wings back up to 67% of the NBS, so they could be reoccupied. The project was very challenging due to the compressed timeframe, but our team delivered in every aspect.

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Commercial Lifting & Re-levelling

Thackeray Place
(Christchurch)

A large building of 5 two-storey Units, and 5 garages (walls reinforced concrete tilt panels, floors reinforced concrete). During re-levelling, the weight of the building when floating on the Hydraulic Jacks, was approximately 618 tonne.

The front 4 Units and west wall of the 5th Unit were re-levelled using Jack and Pack for the perimeter Foundations and walls. The reinforced concrete ground floor slabs were re-levelled using steel trusses, and threaded steel rods temporarily set into the floors.

[read more=”Read more” less=”Read less”]Prior to re-levelling, the Geotechnical Report showed the floors had a Level difference of over 100mm, and Grades in excess of 1.6%.

The floors were re-levelled to within 7mm within the Units (±10mm within the Garages). Evidence before re-levelling showed the floor levels varied considerably prior to the Earthquakes, so the ground floor after re-levelling was considered to be more level than it ever was.

After the floors were re-levelled, Grout was pumped through holes in the floors to fill cavities below, and the filling checked by ground-penetrating radar to ensure there were no cavities left unfilled below.[/read]

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Flood Protection: Lifting & Re-levelling

Waimakariri Sailing & Power Boat Club
(Canterbury)

We performed a highly-technical Lift to elevate the entire Club above flood levels. The task was made even more challenging by the need to coordinate and perform the Lift between tides.

This project demanded exceptional levels of consultation, planning and teamwork. It also demonstrated our ability to provide innovative solutions for work too complex for traditional Lifting methods.

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Heavy Lift & Re-levelling

Waterman Place
(Christchurch)

A block of 12 commercial units, all precast concrete construction with various foundations all approximately 1.5 metres deep. The building was built very close to the estuary, so Meccanico undertook the work in dryer summer months, to ensure the water table was more manageable. Over four weeks, the block of units was lifted 200mm then the units were re-levelled.

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Heavy Lift & Re-levelling

Settlers Crescent
(Christchurch)

16 precast concrete units (2 x blocks of eight), with various pad foundations 1.5 metres deep. The property was located very close to the water and required a lift of over 150mm. Meccanico then also replaced all the concrete slabs and refurbished the units.