The Brae retaining
wall

Following the February 2012 Earthquake, the dwelling and garage had been demolished, leaving only the garage slab and the driveway at the top of the steep section. A retaining wall was required to enable the new house to be built on the section.

With neighbouring properties and dwellings close by on 3 sides of the property, the only access was via the existing driveway at the top of the site, accessed off the Brae. As the retaining wall was adjacent to the existing garage slab, this also had to be stabilised before the work on the wall could begin.

HGM were engaged to construct a 5m high anchored retaining wall . This project included:

Installing self-drilling micro piles to secure the garage slab already in place and grouting the cavity inside the slab
Drilling, installing and grouting 34 anchors , approx252.5 linear metres drilled
Drilling 24 holes for the timber poles, a total of 47.5m and installation and Installation and concreting of 375mm poles
Installation of rails on retaining wall, drainage and backfill and temporary hand rail.

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Location

24 The Brae, Mt Pleasant, Christchurch

Client

March to October 2017 ( approx. 7 months)

Date

2017

Excavated slope marked out for retaining walls, with soil nails or rock anchors positioned across the bank for slope retention and ground stabilisation. The image shows civil contractors preparing a complex civil construction project involving excavation, siteworks and foundation construction.

Timber pile retaining walls being built above a coastal residential area, with excavation machinery working below the structure. The image shows civil contractors managing foundation construction, driven piles, slope retention and complex construction projects in a constrained site.

Excavation machinery working among timber piles during retaining walls construction on a coastal hillside site. The image highlights civil construction, siteworks, earthworks contractors, foundation construction and slope retention for a large scale retaining walls project.

Construction drill and piling equipment operating beside a concrete wall during retaining walls and slope retention works. The image shows drilling services, anchoring and piling, rock anchors, soil nails and civil construction carried out by specialist civil contractors.

Excavated slope marked for retaining walls and ground stabilisation, with visible rock anchors or soil nails set out across the bank. The image shows civil contractors preparing a complex construction project involving excavation, slope retention and siteworks.

Construction drill and piling equipment working beside a concrete retaining wall during civil construction and foundation construction. This image shows drilling services, anchoring and piling, bored piles, rock anchors and slope retention delivered by civil contractors.

Mechanical anchor system installed through a concrete retaining wall, showing civil construction and ground stabilisation work in detail. This image highlights retaining walls, anchoring and piling, slope retention and concrete structure reinforcement by civil contractors.

Large scale retaining walls under construction on a steep coastal site, with timber piles installed beside a covered slope and nearby residential buildings. This image highlights civil construction, slope retention, ground stabilisation and site preparation by civil contractors.

Concrete footing and timber piles forming the base of retaining walls, showing foundation construction and ground stabilisation work in progress. This image shows civil contractors completing concrete structure works, driven piles, slope retention and site preparation for a retaining wall system.

Timber retaining walls and slope protection works on a steep site overlooking the coast, with covered earthworks and installed piles visible along the excavation. This image shows civil construction, retaining walls, ground stabilisation, site preparation and project management by civil contractors.

Large scale retaining walls built with timber poles on a steep coastal site, with civil contractors completing excavation and site preparation above nearby homes. The image highlights retaining walls, slope retention, ground stabilisation, foundation construction and complex project management.

Completed timber retaining walls with visible mechanical anchors installed along the posts for slope retention and ground stabilisation. This image highlights civil construction, large scale retaining walls, anchoring and piling, concrete structure works and project management by civil contractors.

Large scale timber retaining walls completed on a steep site, with mechanical anchors, excavation equipment and civil contractors visible at the top of the structure. This image shows civil construction, slope retention, ground stabilisation, foundation construction and complex project management.

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