Case studies

• Bluecoats school
• Chalk Hill
• Grove Park
• La Sainte Union Covent School
• Sheffield schools

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jnpgroup consulting engineers services provided:

• Organistaion Of Site Investigation
  
• Organisation Of Drainage And Buried Services Survey
  
• Design Of New Steelframe
  
• Design Of New Cantilever Pile And Ground Beam Foundations
  
• Design Check Of Cladding By Others
  
• Checking Of Precast Flooring Design By Others
  
• Structural Fire Requirement Review And Structural Specifications
  
• Access And Escape Review And Detailing
  
• Review Of Deliveries And Site Compound Location
  
• Setting Out Details And Co-Ordination With Steel Supplier
  
• Construction Method Statements

La Sainte Union Covent School

The project was to provide a Four storey infill extension to one of the schools existing teaching blocks with direct access from an existing corridor and stairwell. The extension was to be a stand alone structure to provide additional classroom space and was to be built during term time in a restricted compound.

The Site
The site of the extension was a grass lawn sandwiched between an existing playground area and the existing school building. It had limited nearby parking and restricted vehicle access which presented major obstacles for the construction work. The school was to remain fully open and unaffected by the construction

The Design
The existing Lawn area had to be surveyed prior to any proposals being carried out to establish whether any existing buried services or drainage runs were present within the site.

jnpgroup consulting engineers also had to organise a soils investigation report to be carried, arranging two boreholes to be carried out to establish the local substrate and water table. Trialpits were carried out against the existing building to establish its footing details.

A tree survey of the surrounding area was also carried out to assist with determining a suitable foundation solution.

A piled foundation solution was considered to be the most suitable for the proposals although piling companies had to be liaised with to determine how close the rigs could get to the existing building.

The ground beams were required to be designed with cantilever ends over the existing footings to pick up the the new structural framing over. Due to the height of the existing footings in relation to the existing ground level, the ground beams were limited to shallow depths and had to be designed with varying “T” and “L” shape beams to receive the suspended precast block and beam ground floor.

The piling was carried out during the school holidays but the rest of the ground works and construction was carried out during term time with agreed scheduled deliveries.

The steelframe structure was erected with new columns fixed to the cantilever ground beams with first floor beams designed to support the precast first floor planks and timber flat roof joists.

The external cladding and glazed wall façade were designed and detailed by others and fixed back to the steel frame and when the shell was complete and fitted out the door openings to the existing building were created.