Cep-construction and Design of Multistorey Building by Abhimanyu Parida

7/31/2019 Cep-construction and Design of Multistorey Building by Abhimanyu Parida

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CONSTRUCTION AND DESIGN OF

MULTISTOREY BUILDING

AT

UNITECH LTD

SUBMITTED BY: UNDER THE GUINDANCE OF

ABHIMANYU PARIDA RAJIV GUPTA

1040241 FACULTY COORDINATOR


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Projects Undertaken

1. Construction of residential building (escape)1.1 Excavation, Layout and Foundation

1.2 Column layout, shuttering and casting

1.3 Slab, Beam shuttering and casting

1.4 Important Components

2. Introduction to bonded slab post tensioning2.1 Post tensioning

2.2 benefits

2.3 Tendons and stressing


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Projects Undertaken

3. Design of building component

3.1 Formwork design

3.2 Staircase design3.3 Deep Beams

3.4 Slabs


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Excavation, Layout and Foundation

Excavation is a process of making trenches by digging up

of earth for the construction of foundations and

basements.

Excavation level at escape site is 219.825 mm

Excavation is done by the JCB on the hourly basis

After the excavation the surface is leveled called surface

dressing

Layout is done on the PCC poured over leveled surface.

Column and foundation (raft ) steel is then laid as perdrawings.


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Points to take care:-

layout should be checked properly.

Check any difference between architectural and structural

drawings regarding location of column.

After excavation check the stability of temporary structures built

near the excavated ground. Before laying raft reinforcement, shuttering wall which is mainly

brick wall should be built and should be filled with soil on other

side.

Check the direction of chair bars in the raft


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EXCAVATION


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LAYOUT


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RAFT FOUNDATION


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COULMN CASTING

On the raft the column layout is done.

Layout for starter.

The column ties and link bars are provided as per column

reinforcement drawings and general specifications.

Displacement of main bars should be provided with L bar The plumb of formwork should be checked.

Height of cast should be calculated accurately.

Avoid caps as far as possible.


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LAYOUT , PEDESTAL & STARTER


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LINKS & TIES


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PLUMB & FORMWORK, CASTING,CURING


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SLAB, BEAM SHUTTERING & CASTING

beam bottom is first laid on the column and then slab formwork

is laid

After the reinforcement, the slab is checked for steel as per

drawings and level required.

A camber of 5 mm in provided in the center of slab.

Casting of slab should be discontinue at l/3 from the support.


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SLAB STAGES


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IMPORTANT COMPONENTS

Key in column

Water bar

Binding materials

Expansion joint


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KEY IN COLUMN

since the height of column is very large,

hence it is not possible to cast the column at

one time, to cast the column later the key is

made at the junction so that the proper bondbetween the old concrete and new concrete

is formed.


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KEY IN COLUMN


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EXPANSION JOINT

Since concrete is subjected to volume change. Provision must

be made to cater for the volume change by way of joint to

relieve the stresses produced.

Expansion joint is function of length

Buildings longer than 45 m are generally provided with one ormore expansion joints.

Material used as expansion joint material is armour board

whose thickness is 25 mm.


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EXPANSION JOINT

Expansion joint

material, size is 25 mm

Expansion joint inbuilding


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WATER BAR

Water bar is provided in the retaining wall o

that the moisture cant move from the soil to

the joint. Water bar is basically provided at

the constructions joints of retaining wall of twodifferent towers


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WATER BAR


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BINDING MATERIALS

Since the thermal expansion of concrete is different from that ofmasonry. The interface between the concrete and the masonry isliable to crack. To avoid this crack the chicken wire mesh is used toavoid the crack and also provides the better grip for Masonry withconcrete.

Similarly when the drainage pipes are laid along with the outer wallthen again the connection between the pipe and the wall hasdifferent coefficient of temperature change hence they are joint tothe concrete by lead keys.

In the toilets and kitchen sunken portion the joints in any case are

packed by water proof and non shrinkable material.


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BINDING MATERIALS

Chicken wire mesh between

brick masonry and concrete

Connection of pipes withconcrete

Chicken wire mesh in

conduits through concrete


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WATER PROOFING

Water proofing has remained as an unsolved complex problem

Use of plasticizers, super plasticizers, air-entraining agents

helps in reducing the permeability of concrete by reducing the

requirement of mixing water, hence can be also be regarded aswaterproof material.

Some of approved water-proofing compound by the company

are:- pidilite, cico, fosroe, baushimine, unitile.

Water-proofing cement paint:- super snoweem


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WATER PROOFING

Water proofing in sunken

portion of kitchen and

bathroom WP in sunken portion at

ground level

WP in retaining wall


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WATER PROOFING IN GARDEN AREA

For water proofing in garden area the soil is first leveled and

then rammed to achieve the maximum density

The PCC is then laid down mixed with tape Crete (a water

proofing compound)

After PCC the plaster of fibrous material is done. the bituminous sheets are laid by heating it with the welder. On

those sheets the drainage pipes are laid down with suitable

slope and these pipes are covered with geo-fabric sheets.

Again the plaster is done. On the plaster the 40 mm aggregates

are laid. On the aggregate the geo-fabric sheets are laid down on which

the sand is placed & on the sand the soil ,along with fertilizers,

is placed on which the gardening is done for the non tower area.


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WATER PROOFING IN GARDEN AREA

Sandy soil

PCC mixed with tape

Crete (water proof

compound)

Texas (bitumen) sheet

Drainage pipe

40 mm aggregate

Geo-fabric sheet

Sand


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INTRODUCTION/BENEFITS

Post-tensioning is a method of reinforcing (strengthening)

concrete or other materials with high-strength steel strands or

bars, typically referred to as tendons

allows longer clear spans, thinner slabs

lower overall building height for the same floor-to-floor height.

allows a high degree of flexibility in the column layout, span

lengths and ramp configurations


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POST TENSIONING


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PLACEMENT OF TENDONS

Positioning and fixing of casting and block-outs to the edge formworkor construction joint formwork

The support bars shall be prepared in advance.

Lay tendons according to tendon layout in accordance with thedrawings.

Fix tendons to correct profiles with support bars and chairs and the

tendons are made with provisions for grouting using grout using groutvents and grout hoses

Prepare installation report for every installation as per the enclosedformat.

tolerance of tendon profiles is recommended as follows:

**vertical: + 5 mm (at lowest and highest points)

Horizontal: + 100 mm


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LOADS ON FALSEWORK

Loads on Falsework are any combinations of

the following:

Dead loads,

Imposed loads, Environmental loads,

Incidental loads during erection and

operation, and Lateral pressure.


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DIFFERENT LOAD DATA

Self load shall be determined by either actual measurement or inaccordance with IS 875 (Part I) the unit weight of wet concreteincluding reinforcement shall be taken as 26 kN/m. However, inabsence of the data, load may be assumed as 500 N/M2 for thepurpose of initial calculations .

Loads during constructional operation shall constitute the imposedloads [see IS 875 (Part 2 ) Where allowance has only to be made foraccess and inspection purposes, a loading of 750 N/m should beadequate

The lateral pressure due to fresh concrete depends on the temperatureof concrete as placed, the rate of placing of concrete and the concretemix proportion

Wind loads should be taken for design in accordance with IS 875 (Part3 ) subject to a minimum horizontal load equal to 3 percent of thevertical loads at critical level.

Snow loads should be assumed in accordance with IS 875(4) . Themaximum density of ice may be assumed to be 900 kg/m.


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OUTPUT OF EXCEL SHEET(DOFW)
http://localhost/var/www/apps/conversion/releases/formwork%20design/MAXIMUM%20PRESSURE%20FOR%20FORMWORK.xlshttp://localhost/var/www/apps/conversion/releases/formwork%20design/MAXIMUM%20PRESSURE%20FOR%20FORMWORK.xls


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End Note

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Cep-construction and Design of Multistorey Building by Abhimanyu Parida