A reader has asked about the demolition and construction phase of the replacement of the Wembley Stadium pedway with steps. They were concerned about safety and impact on local roads. Please see an extract below from the Site Management Plan published on the Brent Council Planning Portal
HERE
The works are planned to take approximately 87 days and some phases will require work from 7am until 11pm. The work will not take place on Event Days.
EXTRACT
Upon
taking possession of the site, it will be secured around the areas of immediate
construction work. The initial work activity will focus on clearing the site
below and around the Pedway of those utilities and other items that will
obstruct the pedway demolition and subsequent staircase construction. As areas
become clear works to the foundations of the steps and substructure will commence.
The
foundations to the steps will be constructed in and around the existing pedway
str ucture in advance of its demolition. Therefore, there will be a need to
utilise small / specialist plant, such as restricted access piling rigs that
will be able to access the low headroom areas beneath the existing Pedway to
construct the piles.
In
conjunction with the construction of the new staircase substructure ,
earthworks will be undertaken to create crane mats to the south and west of the
proposed staircase. These will be required to accommodate the craneage that
will service the construction of the staircase superstructure. It is
anticipated that these crane s will be greater than 100T in capacity/size.
Any
superstructure elements of the new staircase that fall outside of the existing
Pedway may also be built in this phase , however, this will require further
consideration in due course as such elements will need to be protected during
the demolition of the existing Pedway structure .
Phase 2 – Pedway Demolition and Construction of Steps
Demolition
This
phase will commence within an agreed window of time to minimise the impact to
Wembley National Stadium. This will be through a window on non - events ( or ,
if this is not feasible, where there are minimal events ). Due to the
constraints in agreeing such a suitable timeframe, extended working hours to
ensure that the works are completed within the agreed timeframe will be
required (as agreed with the Local Authority) .
The Pedway will be demolished in two stages. It is anticipated that the Pedway will
be demolished using traditional excavator mounted munchers and breakers. The
majority of the Pedway will be removed using excavator mounted munchers will
minimise the noise and dust that will be create by this operation. Water spray
dust suppression will be utilised to prevent dust from the demolition
operation.
The first
stage of demolition will focus on removing the Pedway structure from the area
of the new staircase construction. Once this is removed , the demolition will
focus on removing the remainder of the Pedway (as it runs across Engineers Way
towards Olympic Way and Wembley Park station north of the Stadium). A road
closure of Engineers Way will be required whilst the Pedway is removed across
the carriageway area (details as to the number and timeframes required for the
road closures are not yet available but will be agreed , at the appropriate
time, with the Local Authority ) .
Construction of Steps
The
construction of the staircase is anticipated to be a combination of pre - cast
and cast in - situ concrete. It is anticipated that the podium section that
will connect to the S tadium will be cast in - situ and the staircase will be
formed from precast struc tural elements. The staircase is of a modular
construction and will follow a step by step process that will be prescribed by
the designer and supplier. Through this phase of heavy lifting it may be
necessary to have lane closure on Engineers Way to facilitate easy delivery
and unloading of the precast elements. Pedestrian management will be a key
feature of this phase to maintain safety exclusion zones around the works.
The
podium area will be formed using a birdcage scaffold system that will be
designed and installed by specialist contractors. This will be used to support
the permanent formwork panels that will form the soffit of the deck.
Temporary
works will be required to support the precast elements before they are
permanently stitched into the main structure. This support will be provided by
either a birdcage scaffold system, steel trestles or similar . This detail
will be established early in the project .
Two
cranes in excess of 100T capacity will service the construction of the
staircase to allow for lifting and installation of the concrete units and
temporary works systems.
Once the
structure is completed, it will be waterproofed using a proprietary
waterproofing system to allow the paving to commence and the handrailing and
lighting to be installed.
The
attendant craneage will be utilised to service the paving and street furniture
installation. The paving will be finished in sections and will work up the
staircase. The paving at the podium level will be progressed concurrently with
the stair case paving. This will be essential to ensure the programme is met
within the time constraints for delivery .