Page 62 - 건축구조 Vol. 29 / No. 03

Project focus Compton and Edrich stands, Lord’s Cricket Ground

해외작품소개

FIGURE 5: Thumbnail sketches used to explore different materiality options. Blue = steel, dark grey = in situ concrete, light grey = precast concrete

BURO HAPPOLD

the southwest side of the Ground almost FIGURE 6: Revit
2.5m lower than the northwest side. In model of stand
matches, it causes deviation to the ball when showing steel,
foundations and
bowling; for the project, it resulted in different shallow tunnel in
lengths of the lower tiers all the way through red. Half-toned
the Compton and Edrich stands. pink elements are
existing pile caps
Other design considerations
A series of options was explored for the
design of the elliptically shaped canopies,
including steel monocoque and semi-
monocoque (Figure 7). The final option was
a steel framework that supports a further
secondary timber beam network and a
membrane covering. Relatively frequent
spacing of the timber was chosen to
enable a fairly smooth membrane surface
sympathetic to the synclastic shape of the
Media Centre. PROBING TOOK PLACE RAJ MISTRY/BURO HAPPOLD
The canopy’s surface geometry was highly
unusual, taking a number of iterations to RELATIVELY LATE AS IT
refine. The team worked with computational COULD ONLY FOLLOW
software (Grasshopper/Dynamo) to more
readily analyse and produce Revit model DEMOLITION
information with a rapidly developing design.
The bridge link serves both stands at
second-tier level, allowing spectators to to ensure robustness in accordance with BS Fire protection to the structure was provided
travel between the two hospitality areas. It EN 1991 . Imperfections were considered predominantly using intumescent paint.
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is 40m long × 3.5m wide and supported by designing for notional horizontal loads in
on a single row of 7.5m high circular hollow accordance with BS EN 1993 . The lateral Construction
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section (CHS) columns. effects of the live load of the crowd were also First closed season
The seating deck is formed of conventional considered through an equivalent horizontal Impact of Covid-19
precast units and makes no contribution load as a 5% factor of the vertical load. Westminster City Council (WCC) granted full
to the overall lateral resistance of the main The fire strategy for Lord’s has been planning permission for the project in January
frame. designed in line with a typical Green Guide 2019. ISG was subsequently awarded the
Secondary structures of the new stands, approach , utilising sterile circulation and contract in July 2019.
4
such as external stair towers, are compliant, concourse spaces, and enclosing areas of Construction works started in August 2019
being unbraced and taking stability from fire load (such as hospitality areas, bars/ after the Ground’s final international cricket
the main frame. At the interfaces of the new concessions and store rooms) in fire-resisting match of the season had taken place, but while
stands with other existing stands, there are construction. Spectator evacuation is via the it was still being used for County Championship
movement joints in the floor plate and in ground-floor vomitories for the lower tier, and games. Therefore, the old stands were
the connection detailing to ensure lateral the rear escape stairs for the upper tiers. demolished with hoardings in place to separate
movements were not restricted. The evacuation is designed to be within the working areas from the pitch, with work
Vertical and horizontal ties were provided eight minutes specified by the Green Guide. completed in November/December 2019.

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60 건 축 구 조 2022 _ 05 _ 06 제29권 / 제03호 May 2022 | thestructuralengineer.org thestructuralengineer.org | May 2022

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