robus multi span - northern polytunnels

Multi Span RangePolytunnelsExperts in Structures Since 1969.

npstructures.co.uk01282 873120

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3Contents / Planning Services

Planning Services

Introduction

How to choose the right ROBUS

ROBUS Straight Sided

ROBUS 2.3

ROBUS 2.7

Optional Extras

Cover Options

Technical Specifications

Contents

Planning ServicesSince 1992 most horticultural structures have required planning permission. We recommend that advice on planning permission is sought from your local planning authority, before ordering.

If help with this is required we can assist with CAD planning permission drawings.

These drawings show existing site plan and proposed site plan and include the structure

elevations. Prior to an order these services will be subject to a standard charge which

will be credited when an official order is received.

• Elevation drawings only• Full planning application drawings

Ask your sales representative for more information.

N.B. Building regulations shouldn’t be required but we advise you check with your local planning office.

Two Tier Drawing Service Available

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04- 09

10 - 11

12 - 13

14 - 17

18 - 21

22 - 24

25

26 - 27

We are able to provide you and your insurers with framework calculations and proofs of structural integrity.

Can other polytunnel manufacturers provide you with the same?

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4 5Introduction

An increasing number of classic polytunnels are falling victim to the UK’s worsening, harsh weather.Polytunnels are not subject to building regulations, nor do they have to be compliant to any British or European standards.We believe that Farmers and Growers need a product that can be proven to stand up under wind and snow loads as directed by the British Standards Institute and The European Committee for Standardisation.

Our Research and Development Department undertook the comprehensive task of designing such a product.

We found that construction of the classic multi span polytunnels can be very time consuming, complex and costly. Our aim was to reduce the amount of construction time needed, cut down on complicated assemblies and standardise on fittings and fasteners.

Introduction

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6 7Introduction

We are the only polytunnel manufacturer in the UK that offers a multi span polytunnel designed and manufactured to British and European Standards.Current polytunnel design has evolved over time since its inception in the early 70s, mainly based on experience and cost, without any specific loadings or calculations being applied.Each manufacturer claims his structure is stronger, and better by design and price, but from a customer point of view there has been no way of measuring or checking the quality of the product they have been receiving.

We used computer based stress analysis packages tooptimise every member within the new structure.We developed new fittings to aid easier manufacturing and construction.Pre-galvanised steel is used throughout the mainframework, reducing the need for hot dip galvanising.

* Not applicable on the ROBUS Straight Sided Range

We are an extremely safety conscious company, therefore when designing a new product, Health & Safety is also part of the critical design path. ROBUS structures have been designed to negate the health and safety issues associated with working at heights. The main framework can be built at ground level and lifted into position*. When covering or maintaining the structure we have designed a fall arrest protection system which fits directly to the gutter.We constantly strive to improve our own standards to ensure they are in line with, and exceed, HSE guidelines.

The ROBUS structure has been designed in line with the codes of practice as listed on the opposite page.

Introduction

BS EN1990: Basis of structural design UK National Annex to BS EN1990BS EN1991-1-1: Actions on structures – General actions – Densities, self-weight, imposed loads for buildingsBS EN1991-1-3: Actions on structures – General actions – Snow Loads UK National Annex to BS EN1991-1-3BS EN1991-1-4: Actions on structures – General actions – Wind Loads UK National Annex to BS EN1991-1-4BS EN1993-1-1: Design of steel structures – General rules and rules for buildingsBS EN1993-1-8: Design of steel structures – Design of jointsBS EN13031-1: Greenhouses – Design and construction - Commercial production greenhouses

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8 9Introduction

What are the benefits of using a British Standard compliant Structure?Possible lower Insurance premiums

Legislation does not currently exist to compelmanufacturers to comply with relevant British/ENStandards. However due to the increase in the number of growers suffering snow damage over the last couple of years, and the claims that have been brought to the insurance companies, we foresee an hardening of the stance taken by insurance companies, to the point where they may ultimately refuse to in-sure polytunnels unless they are BS/EN compliant.

Safer Structures for you & your staff

We can give assurances that the structures will resist the dead and live loads imposed upon them, as specified in the relevant standards. The dead loads being the self weight of the structure and supplied equipment. The live loads being wind, snow and crop loading. These loadings will be site specific.

Piece of mind in adverse weather

Over the last couple of years we have all seen thedevastating consequences of the forces of nature and their effects on polythene clad structures. With the ROBUS structure you can be assured that you have a structure that is capable of resisting the wind and snow loads as stated in the relevant BS/EN standards.

Introduction

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10 11

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1010

6.5m span 8m span



ROBUS SS

Model: ROBUS 100

Through continuous development and engineering research, our straight-sided ROBUS has all the benefits of our original Multi-Span but with the value added features of being de-signed to allow for the influences of the weather in your area.Air movement can be increased with the addition of side or gable ventilation up to 1.6m high. This can be controlled manually or by auto-matic systems.

In addition to model: ROBUS 100

• Snow bracings to valley hoops - For increased snow protection in areas of higher snow loadings.

• Option of timber or aluminium end frames


• 2 piece crop bar• Inverted V hanger crop bar supports - For

increased wind protection in areas of higher wind speeds.



• 2 piece crop bar• W hanger crop bar supports - For increased

wind & snow protection.• Snow bracings to valley hoops• Option of timber or aluminium end frames


ROBUS SS

ROBUS SS

ROBUS SS

Model: ROBUS 200

Model: ROBUS 300

Model: ROBUS 500

For full material specification of the ROBUS range see pages 26-27

• Straight sided outer hoop• Singular, square valley post• Gable roof bracings• Single ridge tube• End lintel struts• Side wall bracing• Aluminum gutter to valley• Split link brackets to valley columns• Option of timber or aluminium end frames


How to choose the right ROBUSHow to choose the right ROBUS

How to choose the right ROBUS model for your site.

Beaufortwind scale

Limits of wind speed

M/S

Limits of wind speed

MPH

Winddescriptive

terms0 <1 <1.15 Calm

1 1-3 1.15-3.45 Light air2 4-6 4.6-6.9 Light breeze3 7-10 8-11.5 Gentle

breeze4 11-16 12.65-18.4 Moderate

breeze5 17-21 19.5-24 Fresh breeze6 22-27 25.3-31 Strong breeze7 28-33 32-38 Near gale8 34-40 39-46 Gale9 41-47 47-54 Severe gale

10 48-55 55-63 Storm11 56-63 64-72 Violent

Storm12 64+ 74+ Hurricane

The characteristics of snow can vary depending on the length of time the snow has come to rest on your structure.

Snow which has just fallen (Fresh Snow) will be lighter than snow which has melted slightly, of the same depth.

Choose your structure based on the characteristics of snow for your location. i.e If snow is likely to remain days after falling, a loading from the ‘Old Snow’ graph should be taken.

Our sales team will be able to advisethe snow loadings for your site.Contact our sales team for more information.

The Beaufort Wind Force Scale is an empirical measure that relates wind speed to observed conditions at sea or on land.

Our sales team will be able to advisethe wind loadings for your site.Contact our sales team for more information.

Beaufort Wind Force Scale

Characteristics of Snow

Information sourcewww.metoffice.gov.uk

Fresh SnowSettled Snow

(Several Hours after falling)

Old Snow(Several weeks/months after falling) Wet Snow

Information sourceTable E.1 of BS EN 1991-1-3:2003Actions on Structures -General Actions - Snow Loads

All structures from the ROBUS range are designed and manufacturered to BS/EN standards.

For a ROBUS multi span polytunnel to be classed as a BS/EN structure, the correct model must be selected for that particular site and must be constructed, to standard, by our team of constructors.

This means the snow and wind loads for your site must be within the perimeters of the graphs shown, either for the 6.5 metre or 8 metre wide structures.It is not compulsory for you to select the structure which covers your site specification. However, if you select a structure which is outside these perimeters, your structure will not conform to BS/EN standards and we are unable to guarantee it. We will advise a structure which will be best suited to your site and to conform to BS/EN standards.

A typical crop loading, has been used to design our crop bars as described in; BS EN13031-1: Greenhouses - Design and construction - Commercial production greenhouses

Depthof Snow

(mm)

Design Load of Snow (kN/m) Design Load of Snow (kN/m)

Design Load of Snow (kN/m)Design Load of Snow (kN/m)

Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)



Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)



Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)



Depthof Snow

(mm)

Depthof Snow

(mm)

Depthof Snow

(mm)

Model NumberEnsure you quote this number when enquiring about a ROBUS structure.

Green Shaded AreaShows snow and wind loadings for the 8 metre wide ROBUS

Combined Wind & Snow Loadings for the 6.5m and

8m span structures

Red Shaded AreaShows snow and wind loadings for the 6.5 metre wide ROBUS

Wind & Snow Loading for the 8 metre wide structures.

Wind & Snow Loading for the 6.5 metre wide structures.

The green shaded area shows the snow & wind loadings for the 8m span model.Your site must be within these restrictions to qualify as a EN standard compliant structure.Refer to opposite.

The red shaded area shows the snow & wind loadings for the 6.5m span model.Your site must be within these restrictions to be qualify as a EN standard compliant structure.Refer to opposite.

Model DrawingTypical cross section through the structures. Showing positions of included members.

Model DescriptionSpecification list of the model.For full material specification see pages 26-27.

Weeks

Months

Graphs show combined loadings for both 6.5m and 8m span structures.

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1312

6.5m span 8m span



ROBUS SS

Model: ROBUS 100

Through continuous development and engineering research, our straight-sided ROBUS has all the benefits of our original Multi Span but with the value added features of being designed to allow for the influences of the weather in your area.Air movement can be increased with the addition of side or gable ventilation up to 1.6m high. This can be controlled manually or by automatic systems.





• 2 piece crop bar• Inverted V hanger crop bar supports - For

increased wind protection in areas of higher wind speeds.



• 2 piece crop bar• W hanger crop bar supports - For increased

wind & snow protection.• Snow bracings to valley hoops• Option of timber or aluminium end frames


ROBUS SS

ROBUS SS

ROBUS SS

Model: ROBUS 200

Model: ROBUS 300

Model: ROBUS 500


• Straight sided outer hoops• Singular, square valley posts• Gable roof bracings• Single ridge tube• End lintel struts• Side wall bracings• Aluminium gutter to valleys• Split link brackets to valley columns• Option of timber or aluminium end frames


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14 15

6.5m span 8m span

ROBUS 2.3 ROBUS 2.3

ROBUS 2.3m High

ROBUS 2.3 & 2.7

Model: ROBUS 123

Our brand new polyclad unit has the benefit of side gutters set at 2.3m on the outer walls, which can be left open, netted or closed. With an ever changing environment and costly water bills, the facility to harvest water is becoming more imperative. The structure can be utilised for a multitude of growing conditions and a wide variety of crops.

• 2.3m high sides to under eaves• Singular, square valley posts• Aluminium gutter to valleys• Aluminium gutter to sides• Side wall bracings• End lintel struts• Gable roof struts• Single ridge tube• Split link brackets throughout• Option of timber or aluminium end frames.


6.5m span 8m span


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1716

ROBUS 2.3 & 2.7

ROBUS 2.3 & 2.7

ROBUS 2.3 & 2.7

ROBUS 2.3

Model: ROBUS 223

Model: ROBUS 323

Model: ROBUS 423

ROBUS 2.3 & 2.7

ROBUS 2.3 & 2.7

ROBUS 2.3

Model: ROBUS 523

Model: ROBUS 623

In addition to model: ROBUS 123• Snow bracings to valley hoops - For

increased snow protection in areas of higher snow loadings.• Option of timber or aluminium end frames.

In addition to model: ROBUS 123• 2 piece crop bar• W hanger formation supports - For

increased wind & snow protection in areas of higher loadings.

• Option of timber or aluminium end frames.

Our ROBUS 623 is the premium polytunnel in the ROBUS 2.3 Range. This structure has been designed specially for high risk areas. The end frames are used as structural members. Extra bracing and increased material sections make the ROBUS 623 the strongest polytunnel on the market.

In addition to model: ROBUS 123• 1 piece crop bar• W hanger formation supports.• Aluminium end frames as standard.• Increased outer columns• Increased Sway bracings• Extra gable roof bracings

In addition to model: ROBUS 123• 2 piece crop bar• Inverted V hanger crop bar supports - For increased wind protection in areas of higher wind speeds.• Option of timber or aluminium end frames.

In addition to model: ROBUS 123• 2 piece crop bar• Inverted V hanger crop bar supports - For • increased wind protection.• Snow bracings to valley hoops - For

increased snow protection.• Option of timber or aluminium end frames.


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18 19

6.5m span 8m span


ROBUS 2.3 & 2.7

Model: ROBUS 227

ROBUS 2.3 & 2.7

Model: ROBUS 327

ROBUS 2.75

ROBUS 2.3 & 2.7

ROBUS 2.75

ROBUS 2.75m High Model: ROBUS 127

Built to the same exacting standards as the other models but with additional eaves height. This vast volume of air allows the grower to have a protected growing environment with air movement unparalleled by our competitors. From bedding plants through to 4 metre high date palms, this structure has been created around your requirements which, to date, have not been met by a structure of this quality.

• 2.75m high sides to under eaves• Singular, square valley posts• Aluminium gutter to valleys• Aluminium gutter to sides• Side wall bracings• End lintel struts• Gable roof struts• Single ridge tube• Split link brackets throughout• Option of timber or aluminium end frames.



• Option of timber or aluminium end frames.


• 2 piece crop bar• Inverted V hanger crop bar supports - For increased wind protection.• Option of timber or aluminium end frames.



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20 21

6.5m span 8m span


ROBUS 2.3 & 2.7

Model: ROBUS 527

ROBUS 2.3 & 2.7

Model: ROBUS 427

ROBUS 2.75

ROBUS 2.3 & 2.7

ROBUS 2.75

Model: ROBUS 627


• 2 piece crop bar• Inverted V hanger crop bar supports - For • increased wind protection.• Snow bracings to valley hoops - For

increased snow protection.• Option of timber or aluminium end frames.

Our ROBUS 627 is the premium tunnel in the ROBUS 2.75 Range. This structure has been designed for high risk areas where a larger volume is required in a polytunnel.The end frames are used as structural members. Extra bracing & material section give you a strong and spacious structure.


• 1 piece crop bar• W hanger formation supports.• Aluminium end frames as standard.• Increased outer columns• Increased Sway bracings• Extra gable roof bracings


• 2 piece crop bar• W hanger formation supports - For

increased wind & snow protection in areas of higher loadings.

• Option of timber or aluminium end frames. For full material specification of the ROBUS range see pages 26-27

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22 23Optional Extras Optional Extras

Optional ExtrasSide Furniture Options

Timber Base Rail

Timber Side Rail & Net

Alibox Base Rail

Alibox Side Rail & Net

100mm x 50mm (4” x 2”) tanalised

timber base rail inclusive of all brackets

and fixings. Attached to the structure

at ground level, this rail provides an

alternative fixing method to burying the

polythene cover into the ground.

A skirt to ground can be provded for

unlevel ground.

100mm x 50mm (4” x 2”) timber side rail.

Inclusive of all fittings, battens and nails.

Green 40% shade netting fixed between

the side rail and base

rail provides excellent lower level

side ventilation.

Structural aluminium box-section

extrusion - the most rigid rail ever!

Alibox incorporates a fixing rail with a

P.V.C. infill which fit into the aluminium

profile. This system allows you to fit your

sheets under tension without scoring

or cutting the cover. It is attached to the

structure at ground level to provide an

alternative fixing method to burying the

cover into the ground.

Same specification as the Alibox base rail

but attached to the side of the structure

rather than at ground level. This double

rail enables the main cover and shade

netting to be fitted into separate grooves

on one rail. The shade netting is fixed

between the side rail and base rail to

provide lower level side ventilation.

Ventilation Options

Manual Single Roll-Up Curtain

Manual Double Roll-Up Curtain

Motorised Roll-Up Curtains

Top Vent Louvres - 3 Position

Top Vent Louvres - Multi Stage

Roll-up curtains provide a neat and

reliable side ventilation system.

A 50mm diameter aluminium drive tube

is operated by a manual gearbox, simply

turn the handle to raise or lower the

polythene curtain. To eliminate ground

level draughts we have a PVC skirt

stitched to the side ventilation netting,

a feature only available from Northern

Polytunnels. Roll up curtains over 1.5m

use a reinforced polythene for the

curtain material.

Single Roll-up curtain is used with ROBUS

Straight Sided Structures.

Double tube roll-up curtains are used

on structures with higher sides. Double

roll-up vents with aluminium central

drive tube and bottom edge weight tubes

are also used as it provides additional

stability.

Double Roll-up curtain is used with

ROBUS 2.3 and ROBUS 2.75 structures.

We can supply a motorised version of our

roll-up curtain, for aluminium, which can

be connected to a control box.

Call our sales team for more information

about NP CONTROLS.

Top ventilation louvres fit in the D panel

above the doors to create an effective

solution for ventilation. Louvres feature

our unique 3 positional hinge which locks

the louvre in place.

These louvres feature a rack and pinion

system for opening, controlled by a

gearbox with winding handle.

The rack and pinion louvres are

not limited to 3 positions but are

fully adjustable.

N.B Roll-up curtains systems can be fitted to the sides only when used on a ROBUS Straight Sided structures. The ROBUS 2.3 and ROBUS 2.75 can accept roll-up curtains to both sides and gable ends.

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24 25Optional Extras

Cover OptionsThe type of covering material can have a major effect on the growth and development of plants and crops within the structure.

(Lumisol AF - U.V Transparent)

(Opaque White)

(Luminance THB-AF)

(Luminol)

(Shade Net)

Cover Options

Lumisol AF- U.V TransparentUnlike normal greenhouse films that prevent short wavelength UV light (UVB) from reaching plants, our UV transparent films allow UVB to enter the greenhouse thus enhancing the fragrance, taste and colour of the crops. In addition, UV transparent films promote plant anti-oxidants, which are good for health, and encourage stronger plants. This greatly

benefits plant raisers and young plant growers as stronger plants can be easier to plant out thus saving time and raising productivity.

Thickness: 800g (200mu)Light Transmission: 87%Thermic Effect: 90%Light Diffusion: 90%

Luminol AFThermic films that are further enhanced by long-lasting condensation control properties. When properly installed, water will condense uniformly on the film rather than as droplets. This, in turn, improves light transmission and reduces the risk of water falling on to the

plants below, reducing the risk of damage and disease.


Luminance THB-AFThis new generation film combines great thermic and light transmission properties. Its high diffusion characteristics make more light available for plant growth and can help to control peak temperatures and reduce plant scorching. Trials have demonstrated the

production of high yields of excellent quality produce.


Opaque White

Shade Net

A thermic film developed to help keep the growing environment warmer by reducing the heat lost through long wavelength infra-red radiation. Higher overnight temperatures encourage plant growth, can reduce plant losses and allow savings to be made on

heating.

Thickness: 720g (180mu)Light Transmission: 67-68%Thermic Effect: 55%Light Diffusion: 32-33%

Shade netting manufactured from a knitted polyethylene monofilament to give a 40% or 50% shade value. Dark green netting provides

protection against sun and wind. Net covers are sewn to size to fit any size polytunnel.

Aluminium Doors

A variety of door arrangements are available for our structures. Doors are manufactured using a structural aluminium box-section extrusion.

We have chosen to only supply aluminium doors. We think timber doors have a lower

life-span and are a lower quality product in comparison. At NP Structures, we will not

compromise quality and functionality over price.

Doors

Sliding Door Kits

Welded Aluminium Doors

The sliding doors can be fitted as a single

door or a double door. These can be fitted

to the end gable and on the side of the

ROBUS 2.3 and the ROBUS 2.75.

Our sliding doors have a heavy duty

aluminium door track incorporating a

rain pelmet. This is supplied in a full,

single length for easy and fast fitting.

Double sliding door sets have a central

drop bolt to secure the doors in the

closed position. Inclusive of all sliding

door gear, aluminium tracking, fittings

and bolts.

As with the sliding door kits, welded

doors can be fitted as a single or double

door. A welded door is ideal when fitting

to a tunnel in a high risk area or when a

larger door is required.

With little difference between the prices of the various polythenes, careful consideration

should be given to the choice of cover. We use bpi.visqueen films for all of our structures.

We feel bpi.visqueen are the best manufacturer of polytunnel films. They offer

quality, consistency and reliability. They invest heavily in film technology and product

development. We will not compromise quality over price. bpi.visqueen are at the forefront

of cutting edge scientific research and film production.

Five Season Guarantee against prematureUV degradation, on all polythenes.

26 Technical Specifications

Technical Specifications

Aluminium profiles are extruded from grade 6063T06. All our profiles are hot extruded.

All bracings are manufactured from 50.8mm diameter ERW tube. Gable leg levelling braces are upgraded to 60.3mm diameter for Models: ROBUS 623 and ROBUS 627.

Columns are manufactured from either 60mm square ERW tube for ROBUS 2.3m and 60 square heavy gauge galvanised steel for ROBUS 2.75 . Select columns are upgraded to 80mm square heavy gauge galvanised steel for models; ROBUS 623 and ROBUS 627.

Crop bars are manufactured from 50mm diameter ERW tube and crop bar hangers from 38mm ERW tube.

All fasteners are bright zinc plated. All nails are hot dip galvanised.

All fittings are either zinc plated to J5 500 for outdoor use, or hot dip galvanised.

Heavy galvanised profile, designed to fit into the main framework.Concreting bars used to provide stability when setting into wet concrete, as well as providing structural strength.

ERW tube used - Z35 and heavy gauge steel hot dip galvanised to BS EN ISO 1461:2009

Gutters are designed to BS EN 12056-3 and manufactured from extruded aluminium with NP Structures unique sheet trapping profile. The number of outlets can be calculated for your site location.

All hoops are manufactured from 60.3mm diameter ERW tube. The hoops are rolled on a state of the art, specialist NC rolling machine to predefined profiles ensuring a high tolerance is achIeved.

All ridge tubes are manufactured from 50.8mm diameter ERW tube.

All timber supplied by NP Structures is pressure treated tanalised timber (Note: once cut, the raw edge will need treating)

Material Specifications

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Construction & Site Conditions

Aluminium

Bracings

Columns

Crop Bars

Fastenings

Fittings

Foundation Tubes

Galvanising

Gutters

Hoops

Ridge Tubes

Timber

ROBUS Structures are designed to be built on a site with a fall no steeper than 1:100 (1m drop over 100m) and level across the spans.

The construction site may require some degree of preparation before it is suitable for

building on. A sideways slope will generally cause problems, as will undulations in the

site. It is in the clients interest to start with a levelled site produced by a professional.

For our construction team, we have brought together talented and experienced experts.

They’ve been involved with a number of technical projects. Each team is lead by a

construction manager, who will ensure quality control and time manage your project.

For more information about our construction services contact our sales team

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NP Structures LtdMill GreenWaterside RoadColneLancashireBB8 0TA

Tel: 01282 873120Fax: 01282 871733

[email protected]

robus multi span - northern polytunnels

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