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PREFABRICATION AND MODULAR COORDINATION

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This document consists of basic definition about prefabrication and some important contents in modular coordination.

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PREFABRICATION AND MODULAR COORDINATION

  1. 1. PREFABRICATION AND MODULAR COORDINATION PRESENTED BY SREE
  2. 2. 1.1PREFABRICATION Prefabricationis the practice of assembling components of a structure in a factory or other manufacturing site, and transporting complete assemblies or sub- assemblies to the construction site where the structure is to be located. 1.2METHODS OF CONSTRUCTION CONVENTIONAL METHOD PREFABRICATION CONSTRUCTION The conventional method of building is to transport bricks, timber ,cement, sand ,steel and construction aggregate, etc. to the site and to constructthe house onsite from these materials Prefabrication is the practice of assembling components of a structure in a factory or other manufacturing site, and transporting complete assemblies or sub-assemblies to the construction site where the structure is to be located. The term is used to distinguish this process from the more conventional construction practice of transporting the basic materials to the construction site where all assembly is carried out. 1.3STAGES INVOLVED IN PREFABRICATION 1. The structure is divided into number of units. 2. The different units are precast in permanent factories(plant fabrication) or temporary plants (site prefabrication). 3. Transported to the site. 4. Hoisted set into their final places and assembled to form a complete structure.
  3. 3. 1.4PLANS AND SPECIFICATIONS (IS15916) • Drawings shall describe the elements and structures and assembly including all required data of physical properties of componentmaterials (material specification) • Details of connection joints • Site or shop location of services (installation of piping, wiring and other accessories) • Location of inserts (doors, windows and ventilators) • Handling arrangements to avoid failure 1.5MODULAR COORDINATION • Modular coordination is a conceptof coordination of dimension and space in which buildings and components are dimensioned and positioned in terms of basic unit or module. • The basic module is known as 1M which is equivalent to 100mm. • It is internationally accepted by the International Standard Organisation and many other countries including Malaysia. 1.6BACKGROUND • Modular coordination was first explored as an aid to design shortly after the introduction of prefabrication in the construction industry in the industrialization. It was conceived as a further step in the development of systematic design and construction of the building. • This subject has been discussed and attempted in an actual building experiment in practically every developed country.
  4. 4. • Modular coordination was first studied in Singapore in the early seventies. The housing and development board implemented the conceptin 1973 in the new generation flats. Prefabrication and standard components were subsequently introduced. Modular blocks and bricks were introduced in 1983. There are merits to extend the use of modular coordination in other components as well. 1.7AIMS AND OBJECTIVES OF MODULAR COORDINATION  The principle objectives of modular system are to provide practical and coherent solutions for coordination of the position and dimensions of elements, components and space in building design.  This process can contribute to increase design freedom and improved balance between quality and cost in manufacture and construction. 1.8BASIC PRINCIPLE OF MODULAR COORDINATION  The main purpose of Modular Coordination is to achieve the Dimensional Compatibility between the Building Dimensions, Span or Spaces and the Size of Components and Equipments by using related Modular Dimensions.  Modular Coordination generally provides the easy grasped layout of the positioning of the building components in relation to each other and to the building and facilitates collaboration between planners, manufactures, distributors and contractors. 1.9STANDARD RULES IN MODULAR COORDINATION  Modular Coordination is essentially based on the use of modules (basic module and multi-modules) and a reference system to define coordinating spaces and zones for building elements and for the components which form them. There are standard rules to abide by - Rules for locating building elements within the reference system;
  5. 5. - Rules for sizing building components in order to determine their work sizes; - Rules for defining preferred sizes for building components and coordinating dimensions for buildings. • IS:7922-1987: Recommendations for Modular coordination in Building Industry 1.10PURPOSE OF MODULAR COORDINATION: • To reduce the component size produced; • To allow the building designer of greater flexibility in the arrangement of components 1.11MODULAR GRID MODULARGRID BASIC MODULAR GRID MULTI-MODULAR GRID SQUARE GRID RECTANGULAR GRID TARTAN GRID
  6. 6. BASIC MODULAR GRID The fundamental modular grid, is that in which the intervals between consecutive parallel lines is equal to the basic module, smallest planning grid. Fig 1.1BASIC MODULAR GRID MULTI – MODULAR PLANNING GRID : In addition to the basic modular grid, multi-modular grids in which the intervals between consecutive lines are a multi-modular may be used. TARTAN GRID • Interrupted modular planning grid • Intervals or bands of interruption are regularly spaced in both directions • Pattern may be used in very regular plans like those with columns at constant intervals throughout the floor
  7. 7. Fig 1.2 SQUARE AND RECTANGULAR MULTI MODULAR GRID
  8. 8. Fig1.3 TARTAN GRID
  9. 9. 1.12NOTATION AND SYMBOLS
  10. 10. Fig1.4TYPICAL WORKING DRAWING Fig1.5MODULAR COORDINATION WORKING DRAWING
  11. 11. Module Basic modules Multi modules Sub-modular module 1.13Module- It is a standard unit of size to coordinate the dimensions of buildings and components. a.) Basic module- It is the fundamental unit of size ‘n’ modular coordination. The basic module is represented by letter M while its international standard value is: 1M=100mm b.) Multi-module- They are standardized by selected whole multiples of the basic module. The international standard values of multi-modules for horizontal coordinating dimensions are: 3M, 6M, 12M, 30M and 60M Multi-module of 15M is used for special applications. Fig1.6 MULTI MODULE The standardized dimension of horizontal coordination is MH =3M (300mm)
  12. 12. VERTICAL COORDINATON Mv =M (100mm) - Floors are placed within a modular floor zone of nxM increments - Floor to Floor heights are vertically placed nxM increments Fig.1.7 VERTICAL COORDINATION SUB –MODULAR INCREMENT Sub-modular increment is an increment of size, the value of which is a selected fraction of the basic module.  The international standardized value of the sub-modular increment is M/2 = 50mm.  It is to be used where there is a need for an increment smaller than the basic module. Determining the displacements of different modular grids  Modular coordination is the basis for a Standardization of a mass production of component
  13. 13. Fig 1.8 COMPONETS OF WALL 1.14ADVANTAGES OF MC  Facilitate collaboration between buildingdesigners, manufactures, distributors and contractors  Standard size- building components different types of buildings  Speed of construction  Minimize the wastage of materials, time and manpower in cutting and trimming on site  Balance between Quality and Cost 1.15DISADVANTAGES OF MODULAR COORDINATION  Can lead to problems when modules are linked because link must thoroughly test  It is difficult to manufacture to producecomponents based on mm tolerance.

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