Precast concrete technology

GLOBAL INSTITUTE OF ENGINNERING & TECHNOLOGY Presented by :- MOHD HOZAIFA FAISAL CIVIL FINAL YEAR(2015) 11U61A0121

DESIGN OF DUPLEX VILLA BUILT WITH PRECAST CONCRETE TECHNOLOGY

CONTENTS

INTRODUCTIONADVANTAGES/DISADVANTAGES OF PRECASTCOMPONENT OF PRECASTPRODUCTION PROCESSPLANNINGANALYSIS & DESIGNEXECUTIONCONSTRUCTION REQUIRMENTS OVERVIEWCONCLUSION

INTRODUCTIONBuilding and houses are one of the oldest construction activities of human beings. The construction technology has advance since the beginnings from primitive construction technology to the present concepts of modern houses buildings. The present construction methodology for the buildings calls for the best aesthetic look high quality and fast construction , cost effective and innovation touch.

WHAT IS PRECAST ?The word pre-cast stands for the product which is castbefore (pre) used in the construction .

WHY PRECAST?

By producing pre-cast concrete in a controlled environment (typically referred to as a precast plant) the precast concrete is afforded the opportunity properly cure and the closely monitored by the plant employees.

ADVANTAGES OF PRE-CAST TECHNOLOGY Quality ControlEnvironment FriendlyWeather Resistant Reduced Water Dependency Low Maintenance Efficiency

DISADVANTAGES OF PRE-CAST CONSTRUCTION

Precast construction is applicable only for large scale construction.The storing and handling of pre-casted wall or slabs required skilled labour.After erection no modifications of the structure can be executed.

COMPONENTS OF PRECAST WALLS

WALL PRODUCTION

BATTERY MOULD PRODUCTION

Prefabrication of concrete beams, columns and walls in a manually adjustable battery mould is a highly profitable production method. These battery mould consists of a serious panels which roll on rails .

COLD SHUTTER PLATE

The cold shutter plates are furnished outside the battery mold. Furnishing racks are situated in a separate area close to the battery moulds. Cold shutter plates are those where the wall is produced

STEAM CURING

Steam curing is a process for hardening concrete, cement and mortar that involves exposure to warm steam.

REPLACING OF WALLSAfter a curing period of 6-8 hours , the walls are stripped and placed in the racks.

STOCK YARD FOR STORAGE OF PRECASTED WALLS

After battery cases moulding the walls are placed in the store house constructed near the batching plant. The storage house consists of various group of walls which are divided as per requirement .

HANDLING, STORAGE AND DELIVERY

The handling process mainly involves the removal of precast elements from the mould, transportation to the storage yard, loading and unloading and erection of these element at the job site.

SCHEMATIC SKETCH OF BATTERY MOULD

PLANNINGAll the aspects is to be followed as per sun diagram & standards . Built up area: 1710 sft.

STRUCTURAL COMPONENT OF DUPLEX VILLADESCRIPTIONNOsEXCAVATION2 m depthP.C.C Bed8 nosSTRAP FOOTING8 nosPLINTH WALLSPL1 to PL22GROUND FLOOR WALLSGF1 to GF20FIRST FLOOR WALLSFF1 to FF22PARAPET WALLSPW1 to PW16

ANALYSIS & DESIGN OF DUPLEX VILLAE-TABS(v9.2.0) is a special purpose computer program developed specifically forbuilding structures which offers the widest assortment of analysis and design toots available for the structural engineer working on building structure.

SLABS

It is the horizontal piece of concrete, put on the walls or columns of a structure. It serves as a walking surface and also serve as a load bearing member.

LOADS ON SLABSLoad consideration in one way & two way slab

DEAD LOAD Partition wall load Floor finishes Self weight LIVE LOAD Balcony & Staircase:3KN/M2 Bed room, Living room, Hall, Kitchen & Drawing Room: 2KN/M2

DESIGN OF SLABCalculate the loads.Find out the area of steel in both directions.Find out the minimum area of steel.The amount of steel provided should at greater of calculated Ast or minimum Ast. Calculate the spacing in between two bars so that the flow of concrete should be easy.Check for shear.

PRECAST WALLS

M45 Grade of concrete is used for precast walls.Fe500 Grade rebar.Analysis & Design of precast load bearing walls for duplex villa using E-tabs.

FOOTINGS

A concretesupportunder afoundationthat rests in solid ground and is wider than thestructuresupported. Footings distribute the weight of the structure over the ground.

LOADS ON FOOTINGSTotal Load on slab (Dead load + Live load).Load of Partition walls coming onto slab . Self load of precast walls x Number of floors.

DESIGN OF FOOTINGS

Total load C.G of loadsS.B.C of soilArea of footing requiredProjections of footingsEccentricity Maximum pressure under footingsU.D.L on foundation beam

EXECUTION

CONSTRUCTION REQUIREMENT

Elements of control: Alignment , verticality and level

For walls: Vertical deviation +2 mm, -2mm Horizontal deviation 0 mm

For Beam & Slab: Departure from intended horizontal position, +2 mm or -2 mm Departure from intended vertical position, +2 mm or -2 mm

WALL POSITIONING : Mark a line parallel to and 100 mm from from the external edge of the edge of wall.

Place shim plate @500 c/c on the floor and level to wall soffit. Shim plate may also be placed on non shrink motor bed and allow to set.

Adjust position of the dowel bar.

CONCLUSIONTodays precast concrete is among the strongest and structurally sound building materials on the market It has come through many design innovations and upgrades .

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OVERVIEW

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