151 modern method of construction (part 1) dr f dejahang (bsc ceng, bsc (hons) construction mgmt,...

151MODERN METHOD OF CONSTRUCTION

(PART 1)

Dr f Dejahang (BSc CEng, BSc (Hons) Construction Mgmt, MSc, MCIOB, PhD)

MODERN METHOD OF CONSTRUCTION

Revisions to Building RegulationsBuilding Regulations in the past were only

concerned only with the health and safety of people in and around buildings.

More recently the Regulations have been broadened to cover the performance of buildings.

This includes thermal and acoustic performance.


House builders are concerned with meeting higher standards, but with the prospect that performance might be tested after construction.

This can lead to costly remedial work if performance falls short of the standard required.


Some house builders are looking at MMC as a potential way of providing more predictable performance in the completed dwelling.

WHAT ARE MODERN METHODS OFCONSTRUCTION?

Modern methods of construction is a collective term used to describe a number of construction methods.

The methods being introduced into UK house building differ significantly from so-called conventional construction methods such as brick and block.


Housing Corporation-classification

system for dwellingsOff-site manufactured – VolumetricOff-site manufactured – PanellisedOff-site manufactured – HybridOff-site manufactured – Sub-assemblies

and componentsNon off-site manufactured modern

methods of construction


Definition based on attributes such as efficiency and quality.

Most MMC being constructed at present is subject to Housing Corporation grants.

The information in this PPT is therefore based on that system

Volumetric construction

Three-dimensional units produced in a factory, fully fitted out before being transported to site and stacked onto prepared foundations to form the dwellings


VOLUMETRIC / MODULAR CONSTRUCTION

Volumetric construction (often referred to as modular construction) involves the production of three-dimensional units in controlled factory conditions, prior to transportation to site.


Modules can be delivered to site in a variety of forms

some may simply be a basic empty shell awaiting on-site finishing

others may have already been completely fitted out with all the necessary internal/external finishes and services, and be purely ready for on-site assembly.


The maximum size of a volumetric unit is only really determined by the practicalities of transportation, road and site access.

The strength and rigidity of the modules is a very important factor and must be sufficient enough to allow them to be securely transported and craned into place on-site without being damaged.


The majority of the volumetric construction in the UK to date has been used in:

Hotelsstudent accommodationhealth authoritiesNHS Trusts and fast food sectors.


Family-sized accommodation is becoming increasingly popular.

Terraced ‘town-house’ might typically be broken down in four basic modules, plus a roof and even possibly a dormer window module.


Weatherby Building System (WBS’s) range of systems are ideal for use with volumetric modules and include traditional polymer cement renders, thin-coat silicone & acrylic finishes and brick slip cladding, which can all be applied either prior to site delivery or after the modules have been finally positioned on-site.


Some of the benefits of Volumetric

Construction More cost effective that traditional

methods of constructionRapid on-site assembly time Improved qualityReduced defects & snagging


Less disruption on-siteBetter predictability and controlGood thermal, acoustic and wind resistant

propertiesFantastic choice of external finishes

available


ArquitectonicaTrinity PlaceSan Francisco, California


The buildings are conceived as a series of rectangular prisms that rest on each other.

Each building has a different volumetric composition that results in an individual expression within the common vocabulary of the block.


The arrangement of volumes is intended to form a multidimensional neighborhood of buildings, with some structures expectedly anchored firmly on the ground, some less expectedly suspended above other volumes, some informally overlapping.

A large vertical “gateway,” with a grand staircase, leads up to the interior park-like courty


Panellised construction systemsFlat panel units built in a factory and

transported to site for assembly into a three-dimensional structure or to fit within an existing structure


Systems can include wall, floor and roof panels to create the complete structural shell.

Factory-made structural floor and roof panels are known as ‘cassettes’.


There are many different types of panel, the

Main-types are:Open panels: panels delivered to site

where insulation, windows, services and linings are fitted.

All structural components are visible.


Panels can be structural (transmitting load to the foundations) or non-structural (used as non-load bearing separating walls and partitions).


Closed panels: panels based on a structural framing system (such as the type used for open panel systems), which can have factory fitted windows, doors, services, internal wall finishes and external

cladding.The internal structural components can

only be seen around the perimeter of the panel.


Concrete panels: structural wall panels, which can include cladding (often bricks or brick slips), insulation materials, windows and doors.

Composite panels: panels made from a combination of different materials that act together to provide structural support.


Structural insulated panels are a specific form of composite panel.

Structural insulated panels (SIPS): sandwich construction comprising two layers of sheet material bonded to a foam insulation core.

They do not rely on internal studs for their structural performance.


Used primarily as wall and roof panels. Infill panels: non-loadbearing panels

inserted within a structural frame.Any type of panel can be used although

framed panels are more common.Masonry can also be used. it


Curtain walling: vertical building enclosure system that supports no loads other than its own weight and the environmental loads that act upon


Volumetric units integrated with panellised

systemsHybrid construction is also referred to as

semivolumetric construction.Highly serviced areas such as kitchens or

bathrooms can be constructed as volumetric units, with the rest of the dwelling constructed with panels.


What is SIP's, Structural Insulated Panels?


Steel SIP's are engineered panels made from a dense core of EPS (expanded polystyrene) sandwiched between two exterior layers of galvanized steel, resulting in a solid one-piece that provides structural framing, insulation, and exterior sheathing.

The 200mm wide interlocking panels are strong

First few courses; note the sandy soil

Closer View of first few courses

First storey

Different wall thicknesses shown

External View

151 modern method of construction (part 1) dr f dejahang (bsc ceng, bsc (hons) construction mgmt,...

Documents

number of construction

bsc hons construction

system slide

performance of buildings

phd slide

predictable performance

acoustic performance

volumetric unit