Freyssinet UK - Specialist provider of Civil Engineering Projects » Heyrod http://freyssinet.co.uk Bearing Tester, Concrete Repairs, Bearing Replacement, Concrete Corrosion Prevention Post Tensioning Bearing Manufacturer, Bearing Testing, Bridge Bearing Repair, Bridge Bearing Replacement, Bridge Bearings, Bridge Expansion Joints, Flat Jacks, PSC Post Tensioning, Stay Cable, Cable Stay Bridge, Concrete Corrosion Prevention, Structural Concrete Refurbishment, Concrete Repairs, Concrete Bridge Repairs, Concrete Building Repairs, Concrete Structure Repairs, Bearing Tester, Post Tensioning, High Tensile Bars, High Strength Bars, Prestressing Bars, Post Tensioning Bars, Freyssibar Thu, 23 May 2013 13:03:50 +0000 en-US hourly 1 http://wordpress.org/?v=3.4 Freyssinet remains at the forefront in design and construction of post-tensioned floor slabs http://freyssinet.co.uk/freyssinet-remains-at-the-forefront-in-design-and-construction-of-post-tensioned-floor-slabs/ http://freyssinet.co.uk/freyssinet-remains-at-the-forefront-in-design-and-construction-of-post-tensioned-floor-slabs/#comments Tue, 18 Dec 2012 16:59:21 +0000 admin http://freyssinet.co.uk/?p=2592 Post-tensioning technology Freyssinet is an acknowledged leader in specialized civil engineering and introduced post-tensioned concrete building floor slabs to the UK in the early 1980’s. Since that time we have championed this technology and contributed to its acceptance as a standard technology and consequent exponential increase in utilisation in the last decade. We offer a [...]

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]]> Post-tensioning technology
Freyssinet is an acknowledged leader in specialized civil engineering and introduced post-tensioned concrete building floor slabs to the UK in the early 1980’s. Since that time we have championed this technology and contributed to its acceptance as a standard technology and consequent exponential increase in utilisation in the last decade. We offer a full service from conception through detailed design and site installation utilising our in-house design team and experienced site managers and operatives.

The environmental credentials of post-tensioned construction are one of the major selling points when the client’s team are trying to determine the construction material. Typically, post-tensioned slabs save about 25% of the slab depth and hence 25% of the concrete volume, when compared to the Reinforced Concrete (RC) equivalent. The steel content (reinforcement and post-tensioned combined) is often reduced by 65%.

Other advantages of post-tensioned construction include:
• Increasing spans and load carrying capacity;
• Reducing slab thickness;
• Eliminating beam downstands;
• Reducing self weight, quantities of materials and loads on foundations;
• Considerably reducing and simplifying passive reinforcement;
• Reducing the number of expansion joints and columns;
• Better punching shear characteristics;
• Outstanding behaviour in seismic zones;
• Increased cracking resistance;
• Increased waterproofing due to concrete compression;
• Reduced excavation in basements;
• Deflection control;
• Removal of the formwork within 3 days;
• Environmental benefits, less concrete, less steel, fewer lorry journeys.

2012 Freyssinet projects
• Wade Deacon
Wade Deacon School is a 4 storey extension of an existing school in Widnes, Cheshire constructed by Heyrod Ltd. The Ground flood is ground bearing and was cast in reinforced concrete, and Freyssinet were appointed to construct the 3 suspended levels above in post-tensioned concrete floors.
The post-tensioned levels were built in a 16 week schedule starting in early January 2012 till the end of April 2012. The concrete frame consists of a 230mm deep PT slab with a 4B13 system of bonded tendons. Each floor consisted of 6 separate pours with an average area of 550m2 and a total post-tensioned area of 9,750m2.

• Hoe Street
Hoe Street is a partial residential and partial commercial structure consisting of blocks A and B and is located in Walthamstow, North London. Block A contains both residential and hotel floor space, the latter owned by Novotel while Block B is purely residential. All suspended slabs were constructed by Freyssinet in post-tensioned concrete in a 40 week work program for Principal Contractor Vinci Construction. Work started in December 2011 and is planned to finish by the end of December 2012.
Block A is a 13 level block of which the first 8 levels are split between residential and commercial floor space while levels 9-13 are purely commercial. The total area of this block is 3,400m2 of residential floor space with 4B13 bonded tendons and 3,600m2 of hotel floor space with 4B15 bonded tendons. Slab thicknesses vary between 225mm and 375mm at transfer levels.
Block B is an 8 level block with a slab thickness of 225mm and also includes a 300mm podium slab on Level 1 and has a total area of 4,000m2. The system used is a 4B13 bonded strand system throughout the block.


• Great Marlborough Street
Great Marlborough Street is a 34 storey student accommodation block situated near the centre of Manchester. The frame contractor was Heyrod and the job was completed in a 48 week program from February 2011 through to January 2012. Due to the small spans in the layout, the frame was constructed mostly by 200mm deep post-tensioned slabs, and partially by 250mm deep as well as 3 transfer slabs with a thickness of 450mm by use of a 4B13 system and the total area of slab is 13,600m2.


• Cambridge Mosaic
Cambridge Mosaic is also known as The Marquee and consists of 7 levels of post-tensioned slabs and another 4 levels of RC slab and is currently the tallest building in Cambridge. The frame contractor is Getjar Ltd and the frame is being constructed on a 21 week program, due to finish in the next few weeks.
Except for the basement which is reinforced concrete, the remaining levels from Ground Floor to Level 6 are post-tensioned by use of both 4B13 and 4B15 systems and a total slab area of 15,000m2. The basement serves as a parking space and storage while the Ground floor is the commercial level consisting of restaurants and retail shops while the remaining levels are luxury apartments.

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]]> http://freyssinet.co.uk/freyssinet-remains-at-the-forefront-in-design-and-construction-of-post-tensioned-floor-slabs/feed/ 0 Great Marlborough Street reaches the half-way mark http://freyssinet.co.uk/great-marlborough-street-reaches-the-half-way-mark/ http://freyssinet.co.uk/great-marlborough-street-reaches-the-half-way-mark/#comments Mon, 12 Sep 2011 13:29:23 +0000 admin http://freyssinet.co.uk/?p=797 Freyssinet Limited were appointed by frame contractor Heyrod to complete post tensioning works to new student accommodation in Manchester. Works commenced in January 2011 and have just reached the half-way mark, with the completion of the 17th of 35 floors. Student Castle in Manchester offers high quality student accommodation in a great city centre location, [...]

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]]> Freyssinet Limited were appointed by frame contractor Heyrod to complete post tensioning works to new student accommodation in Manchester. Works commenced in January 2011 and have just reached the half-way mark, with the completion of the 17th of 35 floors.

Student Castle in Manchester offers high quality student accommodation in a great city centre location, just a few minutes walk from the main University of Manchester and Manchester Metropolitan University.

The new studios and flats are completely self-contained with excellent study, storage and social space and are equipped with ultra-fast new generation 30mbps broadband and free wi-fi.

The structure consists of 35 levels, all formed from post-tensioned concrete. The thinness of the slabs allows extra storeys to be squeezed in for a set building height, which can really make a difference to the financial viability of tall buildings.

post tensioning

The 11,000m2 job comprises mainly 200mm deep slabs with one corner of each floor plate increasing to 250mm to cater for the 3.2m cantilever. Elsewhere the spans are 6.8 by 6.4m.

Numerous penetrations have been accommodated in the design – from temporary openings for hoists, 4.6m long slots for risers and edge fixings for climbing edge-protection screens.

Freyssinet used the 3B13 and 5B13 anchorage for the bonded tendons. This anchorage system fully complies with the requirements of ETAG 013 “Post-tensioning kit for prestressing of structures”.

The bonded tendons comprise a flattened galvanised steel sheath which is 43mm wide for the 3-strand tendon and 70mm wide for the 5-strand version. After the tendons have been stressed, cement grout is injected under pressure into every sheath to completely fill the void. This provides corrosion protection to the strands as well as establishing bond between the structure and the tendons.

The works are due to be completed in November 2011.

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