Page 63 - 건축구조 Vol. 29 / No. 03

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

Design and construction of the Compton and Edrich stands, Lord’s Cricket Ground redevelopment

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 PAUL EDDLESTON/BURO HAPPOLD
matches, it causes deviation to the ball when showing steel,
foundations and
bowling; for the project, it resulted in different shallow tunnel in FIGURE 7:
lengths of the lower tiers all the way through red. Half-toned Sketches for
the Compton and Edrich stands. pink elements are developing
canopy design
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 FERGUS McCORMICK/BURO HAPPOLD
membrane covering. Relatively frequent
spacing of the timber was chosen to FERGUS McCORMICK/BURO HAPPOLD FERGUS McCORMICK/BURO HAPPOLD
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  FIGURE 8: Grid line B lower column, after fabrication
refine. The team worked with computational COULD ONLY FOLLOW and awaiting entry to paint shop. Photo shows thick
software (Grasshopper/Dynamo) to more baseplates with cruciform shear keys, anchor holes and
readily analyse and produce Revit model DEMOLITION grout holes. To right are connections to floor and lower-  FIGURE 9: Elevation of backspan part of Level 2 raker  FIGURE 10: Level 3 raker, showing cantilever portion,
showing, at right, tapered flanges towards connection for
tier raker structures whose geometry and form varied
with field of play tip to right of image and junction with grid
information with a rapidly developing design. around stand rear outer connection to CHS columns line B node to centre of image
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. As well as demolition and groundworks, times. Inevitably, some members of the supply assembly. The three subassemblies were then
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is 40m long × 3.5m wide and supported by designing for notional horizontal loads in the first phase also included the erection of chain had to contend with Covid impacts, which dimensionally checked and welded together to
on a single row of 7.5m high circular hollow accordance with BS EN 1993 . The lateral Construction the main steel frames of the stands along affected productivity levels. form the single assembly, prior to painting and
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section (CHS) columns. effects of the live load of the crowd were also First closed season with precast floor and terrace units. Work loading for delivery to site.
The seating deck is formed of conventional considered through an equivalent horizontal Impact of Covid-19 on the new structures began in January/ Steel frame fabrication and erection The grid line B box columns form the
precast units and makes no contribution load as a 5% factor of the vertical load. Westminster City Council (WCC) granted full February 2020, before concrete started to Severfield’s steelwork package involved some backbone of the primary structural stability
to the overall lateral resistance of the main The fire strategy for Lord’s has been planning permission for the project in January be placed in March/April. The project was complex fabrication, partly due to the effect system for the stands, incorporating moment
frame. designed in line with a typical Green Guide 2019. ISG was subsequently awarded the maintaining programme despite one of the of significantly varying geometries through the connections in both the transverse and
Secondary structures of the new stands, approach , utilising sterile circulation and contract in July 2019. wettest winters in the past decade. WCC stands; this was especially true for the columns longitudinal directions. Not surprisingly, these
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such as external stair towers, are compliant, concourse spaces, and enclosing areas of Construction works started in August 2019 was supportive in allowing weekend working (Figure 8) and plate girder rakers (Figures 9 are among the most heavily engineered
being unbraced and taking stability from fire load (such as hospitality areas, bars/ after the Ground’s final international cricket for a four-month period. and 10), which provide support to the precast steelwork details on the project.
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 At this point, the Covid-19 pandemic hit, concrete terraces. The final connection details reflect Buro
stands with other existing stands, there are construction. Spectator evacuation is via the it was still being used for County Championship with a lockdown imposed in March 2020. As part of the fabrication method, each Happold’s original concept very closely, with
movement joints in the floor plate and in ground-floor vomitories for the lower tier, and games. Therefore, the old stands were ISG rapidly put a Covid plan into operation raker component was split into three individual the columns split above and below the primary
the connection detailing to ensure lateral the rear escape stairs for the upper tiers. demolished with hoardings in place to separate and site works continued safely with between subassemblies. This made turning, handling rakers at levels 2 and 3, effectively enabling
movements were not restricted. The evacuation is designed to be within the working areas from the pitch, with work 100 and 125 operatives on site each day, and machining in the factory a lot easier than the cantilever terrace rakers to be continuous
Vertical and horizontal ties were provided eight minutes specified by the Green Guide. completed in November/December 2019. adhering to social distancing measures at all if the rakers had been fabricated as a single through the column, while facilitating moment
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May 2022 | thestructuralengineer.org
May 2022 | thestructuralengineer .org thestructuralengineer .org | May 2022 Journal of The Korea Structural Engineers Association 61
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