Concrete Flooring Brochure - John Nicholls

BEAM & BLOCK
HOLLOWCORE FLOORS
PRECAST SECTIONS
CONCRETE LINTELS
STEEL LINTELS
Concrete Flooring Brochure

Stressline Flooring Systems
Stressline's extensive range of prestressed fl ooring products allows
estimators 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.
Prestressed Flooring
‘I’ Beam Design
Various Sections
End Slips
Design & Development
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.
Prestressed Concrete
Spans in excess of 9m
150mm & 200mm Deep
Design & Development
Precast Sections
Prestressed Beam and Block Flooring
Stressline 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 blocks
or 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 Flooring
To 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 Concrete
With 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.
13

Flooring Systems
Floor fi nishes to
Architects specifi cation
Hollowcore Flooring
Provision for
services and pipes
Multiple Beam
support for stair fl ight
Beam Spacings
adjusted to suit
load/span
End Slips allow full
fl oor coverage
of blocks
Staggered Beams
used on shared bearing
D.P.C used
at ground fl oor level
Typical Layout and Construction Details
14

Prestressed Flooring
Infill Block Specification
Any 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 Infill
Where 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 Floor
The 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/DPM
These 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.
Ventilation
Where 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 Membrane
Where 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 Insulation
Latest 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.
Void
A minimum void of 75 -100mm is required
beneath the fl oor. This should be doubled on
clay heave sites.
Ceiling
Ceiling 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 Courses
Stressline 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's
quotation will detail quantities and price for
these edge blocks.
Precast Staircases
Stressline 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.
15

Prestressed ‘I’ Beams
Section Weight Centres Floor Self Weights
Prestressed
Strands
Serviceable
Moment
Ultimate
Moment
Ultimate
Shear
Basic Fire
Resistance
(WxD)mm
(kg/m) (mm) 1900 kg/m³
(kN/m²)
(kg/m²)
1350 kg/m³
(kN/m²)
(kg/m²)
650 kg/m³
(kN/m²)
(kg/m²)
(kNm) (kNm) (kN) (Hours)
510 2.15 219 1.68 171 1.14 116
105 X 150 28.03 510/285 2.23 227 1.78 182 1.27 130
1 x 9.3mm 4.326 6.864 15.870 0.5
285 2.37 242 1.96 200 1.51 154
530 2.19 224 1.75 178 1.22 125
125 X 150 34.95 530/305 2.28 233 1.86 190 1.37 140
2 x 8.0mm 6.676 10.024 24.627 0.5
Designed to BS8110
305 2.44 249 2.06 210 1.63 166
570 2.30 234 1.88 192 1.40 143
165 X 150 50.06 570/345 2.41 245 2.02 206 1.58 161
345 2.58 264 2.25 229 1.87
305 3.13 320 2.75 281 2.27
191
530 2.60 265 2.15 219 1.58 161
125 X 225 56.70 530/305 2.79 285 2.37 242 1.83 187
232
1 x 9.3mm
&
2 x 8.0mm
1 x 9.3mm
&
2 x 8.0mm
9.611 14.727 38.200 0.5
15.800 23.000 32.940 0.5
16

Flooring Load Span Tables
Wide Centres - using flooring block
440
Beam
(mm)
105 x 150
125 x 150
165 x 150
125 x 225
Centres
(mm)
510
530
570
530
Superimposed Load in kN/m²
Block Density
(kg/m³) 1.5 2.0 2.5 3.0 4.0 5.0
1900
3.53 3.36 3.22 3.04 2.60 2.27
1350
3.70 3.51 3.35 3.21 2.76 2.39
650
3.99 3.76* 3.56* 3.39*
1900
4.30 4.10 3.93 3.78 3.51 3.28
1350
4.50 4.28 4.08 3.91 3.61 3.37
650
4.83 4.56* 4.33* 4.12*
1900
4.94 4.72 4.52 4.35 4.05 3.81
1350
5.15 4.90 4.68 4.49 4.17 3.91
650
5.49 5.19* 4.94* 4.71*
1900
5.90 5.62 5.37 5.25 4.80 4.50
1350
6.15 5.82 5.55 5.32 4.92 4.60
650
6.50 6.15* 5.82* 5.55*
Maximum clear span in metres
Alternate Centres - using flooring block
440 215
Beam
(mm)
105 x 150
125 x 150
165 x 150
125 x 225
Centres
(mm)
510/285
530/285
570/345
530/305
Block Density
(kg/m³) 1.5
1900
3.98
1350
4.16
650
4.20*
1900
4.82
1350
5.00
650
5.00
1900
5.47
1350
5.68
650
6.02
1900
6.55
1350
6.80
650
7.17
Maximum clear span in metres
Narrow Centres - using flooring block
2.0
3.79
3.96
3.20
4.60
4.78
5.00*
5.23
5.41
5.70*
6.25
6.47
6.77*
Superimposed Load in kN/m²
2.5
3.63
3.78
3.99*
4.41
4.57
4.82*
5.02
5.18
5.43*
6.00
6.17
6.45*
3.0
3.49
3.62
3.81*
4.24
4.38
4.60*
4.83
4.97
5.19*
5.75
5.92
6.17*
4.0
3.25
3.35
5.0
2.92
3.07
3.95 3.70
4.05 3.78
4.51 4.24
4.62 4.34
5.35 5.02
5.50 5.15
215 215 215
Beam
(mm)
105 x 150
125 x 150
165 x 150
125 x 225
Centres
(mm)
285
305
345
305
Superimposed Load in kN/m²
Block Density
(kg/m³) 1.5 2.0 2.5 3.0 4.0 5.0
1900
4.20 4.20 4.20 4.10 3.82 3.60
1350
4.20 4.20 4.20 4.20 3.93 3.68
650
4.20 4.20* 4.20* 4.20*
1900
5.00 5.00 5.00 5.00* 4.59 4.31
1350
5.00 5.00 5.00 5.00 4.70 4.40
650
5.00 5.00* 5.00* 5.00*
1900
6.10 5.95 5.71 5.50 5.15 4.85
1350
6.10 6.10 5.87 5.64 5.26 4.94
650
6.10 6.10* 6.10* 5.85*
1900
7.45 7.12 6.85 6.60 6.15 5.80
1350
7.67 7.32 7.02 6.75 6.30 5.90
650
7.80 7.62* 7.27* 6.97*
Maximum clear span in metres
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.
17

Flooring Load Span Tables
Standard Centres - using thermal floor
Beam
Width x Depth
(mm)
Centres
(mm)
Superimposed Load
1.5 (kN/m²)
105 x 150 610 3.730
125 x 150 630 4.530
165 x 150 670 5.175
Maximum clear span in metres
*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.
Prestressed Hollowcore Floor
Unit
Depth
Self Weight
kN/m²
Self Weight
kg/m²
1.5 2.0 2.5 3.0 4.0 5.0 7.50
150H 2.96 302 7.10 6.90 6.65 6.45 6.10 5.80 5.20
200 2.94 300 8.40 8.10Superimposed 7.80 7.60Load 7.10 (kN/m²) 6.75 6.00
Maximum clear span in metres allows for characteristic service live loads + self weight + 1.5 kN/m²
fi nishes + 1kN/m² partitions.
18

End Slips
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.
Stressline end slips can also be used as a coursing block
to adjust fl ooring levels as required.
375 x 90 x 40 mm
Stressline Floor Beam
375 x 125 x 40 mm
Standard ACBA
flooring grade infill
blocks (by others)
Stressline End Slip
D.P.C. (by others)
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.
END SLIP SECTION DIMENSION
L X W X H mm
(Nominal)
INNER SKIN
(mm)
UNIT WEIGHT
(kg)
PACK QUANTITY
PACK WEIGHT
(kg)
CRUSHING
STRENGTH (N/mm²)
375 x 90 x 40
100
2.85
200
570
35
375 x 125 x 40
125 - 140
4.20
200
840
35
19

Stressline Limited
Foxbank Industrial Estate
Stoney Stanton
Leicester
LE9 4LX
T: 0870 750 3167
F: 0870 750 6379
E: 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