BEAM & BLOCK

HOLLOWCORE FLOORS

PRECAST SECTIONS

STEEL LINTELS

Concrete Flooring Brochure

CONCRETE LINTELS

13

Stressline's extensive range of prestressed fl ooring products allowsestimators and designers to determine the most economical solution to satisfy your loading and span requirements.

Upon receipt of your enquiry, which should contain copies of your working drawings and loading requirements, Stressline will produce a detailed quotation for your consideration.

After placing your order Stressline's technical offi ce will design and prepare a comprehensive layout drawing, which will be sent back to you for approval to ensure that your requirements have been covered.

Being able to offer both ground and upper fl ooring solutions incorporating precast stairs, landings and balconies enables the customer to source all his structural fl ooring requirements from just one supplier.

Full technical support and advice is available from product suitability, through to detailed design calculations, all free of charge.

Installation onto masonry or steelwork by our qualifi ed teams of installers ensures that your fl oor has been installed correctly and that the designed solution has not been compromised.

Whether you are looking for a ground fl oor for a home extension, or a major multi call-off development Stressline have a service solution that will suit your needs.

Stressline Flooring Systems

Prestressed Beam and Block FlooringStressline has constantly reacted to changes in modern building practices and have developed their own range of prestressed concrete fl oor beams, incorporating either dense concrete blocksor high grade polystyrene forms able to span up to 8 metres.

Available for use at both ground fl oor, and in certain circumstances at fi rst fl oor, prestressed beam fl ooring offers a fl exible and dependable method to overcome diffi cult site conditions.

Architects, engineers and developers have learnt that the Stressline range of prestressed suspended fl ooring provides the ideal solution where land has been made up, is sloping, or has potential contamination concerns. With the benefi ts of off-site manufacturing and no on site curing of concrete, it is possible to allow following trades access as soon as the fl oor is installed.

Hollowcore FlooringTo compliment the beam fl ooring systems Stressline offer two sections of Hollowcore fl ooring, with spans in excess of 9 metres, either 150mm deep or 200mm deep to resolve many specifi cation problems.

Precast ConcreteWith Stressline's in-house design and technical team it is possible to produce staircases up to a capacity of 10 tonnes, either straight or cranked together with landing slabs and other precast requirements.

Prestressed Flooring

‘I’ Beam Design

Various Sections

End Slips

Design & Development

Prestressed Concrete

Spans in excess of 9m

150mm & 200mm Deep

Design & Development

Precast Sections

Flooring Systems

D.P.C usedat ground fl oor level

End Slips allow full fl oor coverage

of blocks

Multiple Beamsupport for stair fl ight

Staggered Beamsused on shared bearing

Beam Spacingsadjusted to suit

load/span

Provision forservices and pipes

Floor fi nishes toArchitects specifi cation

Hollowcore Flooring

Typical Layout and Construction Details

14

15

Prestressed Flooring

Infi ll Block Specifi cationAny dimensionally accurate solid building blocks 440 x 215 x 100mm may be used as infi ll within the fl oor provided that they can support a 3.5kN Transverse Load over a 400mm clear span. Stressline's quotation will specify a maximum block density that the fl oor has been designed for. While lighter blocks may be used on no account should heavier than specifi ed block be used.

Your Builders Merchant or block manufacturers will confi rm the suitability of your blocks. Some aerated concrete block manufacturers have fl oor infi ll blocks of non-standard size. These can be incorporated into the fl oor provided that Stressline are aware of their probable use at the quotation and design stage. (Protection of this infi ll will be required during construction).

Concrete Infi llWhere infi ll concrete between beams is used this should be of mix proportion 1:5:3 (Cement/Sand/Aggregate) with maximum 10mm aggregate.

Holes Through The FloorThe formation of the holes will be by the omission of blocks from the fl oor. Voids around pipes to be made good with insitu concrete.

DPC/DPMThese are to be provided by others in accordance with Architect’s details. It is a NHBC requirement that a DPC should be installed beneath the fl oor beams to deter aggressive ground water chemical attack. This is in addition to the other membranes which the Architect may specify.

VentilationWhere the void to the underside of ground fl oor is to be ventilated, air bricks must be fi tted to manufacturer’s specifi cations. Provisions should be made for ventilation through internal support/sleeper walls. Ventilation from garages is not permitted. A minimum of 1500mm² of free air per metre run of external wall is required. Care must be exercised when positioning ventilators. Floor beams must not bear directly onto the ventilator.

Gas MembraneWhere Methane or Radon gas penetration is perceived as a potential problem, proprietary gas proof membranes may be applied across the fl oor and adjacent walls and cavities so as to isolate the dwelling from the void beneath. Additional sub-fl oor ventilation requirements may need to be met. Local Building Control should be able to advise on this.

Thermal InsulationLatest Building Regulations call for ground fl oors to have thermal performance. Numerous different calculation routes are available to determine the amount of insulation (if any) required to comply with these requirements. Your Architect/Engineer should have determined these during your Building Regulations application.

VoidA minimum void of 75 -100mm is required beneath the fl oor. This should be doubled on clay heave sites.

CeilingCeiling clips to support 50 x 38mm ceiling battens are available if required for upper fl oors. A minimum ceiling void of 38mm can provide service runs.

Split CoursesStressline offer 375 x 90 x 40mm concrete slips for making good to the edges of the fl oor where a 50mm split course is required to the underside of the infi ll blocks. Stressline'squotation will detail quantities and price for these edge blocks.

Precast StaircasesStressline are able to design and manufacture precast concrete stairs, landing and balconies to complete your building requirement. Delivery dates for these precast specials will be given at enquiry stage.

Please refer to Stressline's Health and Safety documentation before receiving your delivery.

16

PrestressedStrands

ServiceableMoment

UltimateMoment

UltimateShear

Basic FireResistance

(kNm) (kNm) (kN) (Hours)

1 x 9.3mm

&

2 x 8.0mm

1 x 9.3mm

&

2 x 8.0mm

Prestressed ‘I’ Beams

(WxD)mm

Section Weight Centres Floor Self Weights

(kg/m) (mm) 1900 kg/m³(kN/m²) (kg/m²)

1350 kg/m³(kN/m²) (kg/m²)

650 kg/m³(kN/m²) (kg/m²)

345 2.58 2.25 1.87

305 3.13 2.75 2.27

Designed to BS8110

264

320

229

281

1 x 9.3mm 4.326 6.864 15.870 0.5105 X 150 28.03 510/285 2.23 1.78 1.27 227 182 130

285 2.37 1.96 1.51 242 200 154

510 2.15 1.68 1.14 219 171 116

2 x 8.0mm 6.676 10.024 24.627 0.5125 X 150 34.95 530/305 2.28 1.86 1.37 233 190 140

305 2.44 2.06 1.63 249 210 166

530 2.19 1.75 1.22 224 178 125

9.611 14.727 38.200 0.5165 X 150 50.06 570/345 2.41 2.02 1.58 245 206 161

191

570 2.30 1.88 1.40 234 192 143

15.800 23.000 32.940 0.5125 X 225 56.70 530/305 2.79 2.37 1.83 285 242 187

232

530 2.60 2.15 1.58 265 219 161

17

Flooring Load Span Tables

5.04.03.02.52.01.5Superimposed Load in kN/m²

Block Density(kg/m³)

Centres(mm)

Beam(mm)

2.272.603.532.392.763.70

3.994.30 3.51 3.284.50 3.61 3.374.834.94 4.05 3.815.15 4.17 3.915.495.90 4.80 4.506.15 4.92 4.60

3.043.213.39*3.783.914.12*4.354.494.71*5.255.325.55*

3.223.353.56*3.934.084.33*4.524.684.94*5.375.555.82*

3.363.513.76*4.104.284.56*4.724.905.19*5.625.826.15*6.50

19001350

65019001350

65019001350

65019001350

650530125 x 225

570165 x 150

530125 x 150

510105 x 150

5.04.03.02.52.01.5Superimposed Load in kN/m²

Block Density(kg/m³)

Centres(mm)

Beam(mm)

2.923.253.073.35

3.95 3.704.05 3.78

4.51 4.244.62 4.34

5.35 5.025.50 5.15

3.493.623.81*4.244.384.60*4.834.975.19*5.755.926.17*

3.633.783.99*4.414.574.82*5.025.185.43*6.006.176.45*

3.793.963.204.604.785.00*5.235.415.70*6.256.476.77*

3.984.164.20*4.825.005.005.475.686.026.556.807.17

19001350

65019001350

65019001350

65019001350

650530/305125 x 225

570/345165 x 150

530/285125 x 150

510/285105 x 150

5.04.03.02.52.01.5Superimposed Load in kN/m²

Block Density(kg/m³)

Centres(mm)

Beam(mm)

3.824.203.683.934.20

4.205.00 4.59 4.315.00 4.70 4.405.006.10 5.15 4.856.10 5.26 4.946.107.45 6.15 5.807.67 6.30 5.90

4.104.204.20*5.00*5.005.00*5.505.645.85*6.606.756.97*

4.204.204.20*5.005.005.00*5.715.876.10*6.857.027.27*

4.204.204.20*5.005.005.00*5.956.106.10*7.127.327.62*7.80

19001350

65019001350

65019001350

65019001350

650305125 x 225

345165 x 150

305125 x 150

285105 x 150

Maximum clear span in metres

Maximum clear span in metres

Maximum clear span in metres

Wide Centres - using fl ooring block

Alternate Centres - using fl ooring block

Narrow Centres - using fl ooring block

Notes. 65mm screed fi nish with insulation 1.41 kN/m² has been included.This table is given as a guide only and allowance should be given to partition loads or point loads supported by fl oor. The effect of camber and defl ection on partitions must be considered when using maximum or near maximum spans. It is recommended that a mesh screed for imposed loads in excess of 5.0 kNm² when the block is 440mm. *For superimposed loads other than 1.5 kNm² using 650kg/m³ blocks refer to block manufacturer. Block Size: 440 x 215 x 100mm.

3.60

440

440 215

215 215 215

18

Flooring Load Span Tables

Standard Centres - using thermal fl oor

Maximum clear span in metres

Superimposed Load (kN/m²)

Self WeightkN/m²

UnitDepth

Self Weightkg/m²

Prestressed Hollowcore Floor

Maximum clear span in metres allows for characteristic service live loads + self weight + 1.5 kN/m² fi nishes + 1kN/m² partitions.

1.5 2.0 2.5 3.0 4.0 5.0 7.50

Superimposed Load1.5 (kN/m²)

Centres(mm)

BeamWidth x Depth

(mm)

165 x 150 670 5.175125 x 150 630 4.530105 x 150 610 3.730

*75mm screed fi nish - 1.84 kN/m² has been included.

Note:The fl oor can withstand a live load of 5kN/m² from blockwork partitions, parallel and perpendicular to the span. This load is NOT included in our calculations for the above load/span table. Please contact our technical department for advice.

T60 (540 x 1220) has been used in our calculations.

S i d L d

150H 2.96 302 7.10 6.90 6.65 6.45 6.10 5.80 5.20200 2.94 300 8.40 8.10 7.80 7.60 7.10 6.75 6.00

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End Slips

CRUSHINGSTRENGTH (N/mm²)

PACK WEIGHT (kg)

PACK QUANTITYUNIT WEIGHT(kg)

INNER SKIN(mm)

END SLIP SECTION DIMENSIONL X W X H mm

(Nominal)

375 x 90 x 40375 x 125 x 40

100125 - 140

2.854.20

200200

570840

3535

375 x 90 x 40mm and 375 x 125 x 40mm end slips are specifi cally designed for use with Stressline fl oor beams.

This slimline block provides a simple and cost effective solution by allowing standard fl ooring grade infi ll blocks to be used over the entire fl oor area instead of using more costly infi ll/edge block combination.

The end slips can be easily cut when used with narrow beam centres.

Standard ACBAflooring grade infillblocks (by others)

Stressline End Slip

D.P.C. (by others)

Stressline Floor Beam

375 x 90 x 40 mm

375 x 125 x 40 mm

375 x 90 x 40mm and 375 x 125 x 40mm end slips are specifi cally designed for use with Stressline fl oor beams.

This slimline block provides a simple and cost effective solution by allowing standard fl ooring grade infi ll blocks to be used over the entire fl oor area instead of using more costly infi ll/edge block combination.

The end slips can be easily cut when used with narrow beamcentres.

Stressline end slips can also be used as a coursing blockto adjust fl ooring levels as required.

Stressline LimitedFoxbank Industrial EstateStoney StantonLeicesterLE9 4LX

T: 0870 750 3167F: 0870 750 6379E: sales@stressline.ltd.uk

The information contained in this brochure was accurate at the date of publication. We reserve the right to introduce, at any time, modifi cations and changes of details that may be deemed necessary. December 2009.

www.stressline.ltd.uk