Sunday, 19 August 2018

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SLIP FORM : ASSEMBLY PROCEDURES : Straight Slipform



1. Position the vertical and horizontal reinforcement with correct cover. 

2. Casting of the starter. (min : 150 - 200 mm) 

3. Check starter for the correctness in level and diameter. 

4. Fix the inside and outside staging brackets/erect scaffold pipes, if required. 

5. Fix timber runners connecting the walkway brackets. / Level the surface using cement mortar. 

6. Check the level. 

7. Tie the vertical and horizontal reinforcement up to shutter top height. 

8. Mark the position of inside and outside yokes in the starter, starting from the tower location. 

9. Ensure that three sets of yokes are located in between two tower verticals. 

10. Align the panels and introduce steel washers at regular intervals to maintain4mm slope both inner & outer faces. 

11. Fix top and bottom waler pipe. Fix external supports, both horizontal and inclined to align the shutter. 

12. Fix filler panels. 

13. Repeat the operation 10 to 12 for outside and make sure that washers are introduced at the bottom of shutters to achieve 4mm slope towards inside. 

14. Fix the waler shoes, inside and outside yoke legs. Adjust waler shoe and check the verticality on both faces. 

15. Keep timber supports between top & bottom walers at yoke location. 

16. Align the form panel by external supports. 

17. Fix the yoke beam generally two numbers at the bottom and one number at top. 

18. Check the level of yoke beams with spirit levels. 

19. Fix the inside and outside walkway brackets. 

20. Finish the final alignment by suitably adjusting the waler shoe bolts. Ensure that all walers are touching the form panels. Provide packing wherever required. 

21. Fix the flying tie rod assembly and support the center rings. Ensure uniform tightness is maintained in all the spokes.

Wednesday, 15 August 2018

SLIP FORM : Types Of Slipform

The Slipform can be broadly classified into, 

A. Straight Slipform. 
B. Tapering Slipform. 
C. Slipform for Special Applications.




Typical Structures that are constructed using Straight Slipform technique are, 

1. Silos 
2. Cylindrical chimneys 
3. Water tank shafts 
4. Columns 

Typical Structures that are constructed using Tapering Slipform are, 

1. Conical chimneys 
2. Ventilation stack 
3. Tapered bridge piers 

Typical Structures that are constructed using Special Slipform are, 

1. Lift cores 
2. Framed structures 
3. Preheater building 
4. RCC Pylons 

Construction of block of flats, lifts and stair- well, bridge piers, Preheater and RCC pylons for boiler supporting structure using Slipform techniques comes under special applications because of their complex sizes, shapes and loads to be lifted along with Slipform, like walkway trusses, etc. which is essential for construction.

Wednesday, 8 August 2018

SLIP FORM : Design Considerations

The Slipform should be designed so that the loads to which its various component parts are subjected are uniformly distributed, and the yokes are loaded as uniformly and axially as possible to avoid their overturning. The jacks should not be located in wall openings as for as possible. The loading should not exceed the lifting capacity of the jacks. 



The loads acting on Slipform can be classified as follows,

A. Basic Loads

1. Dead load due to the components

2. Live loads due to Concrete

3. Friction between form and concrete

4. Workmen

5. Materials

6. Machinery

7. Other installations

8. Auxiliary load due to the way of application of live loads

9. Crowds of workmen

10. Piles of materials

11. Shocks produced by material unloading


B. Accidental Loads

1. Wind pressure

2. Adhesion between concrete and form due to long interruption

3. Friction due to incorrect position of form

4. Failure of one jack

5. Extraordinary Loads

6. Breaking of certain members of the slipform

7. Failure of two adjacent jacks


Minimum concrete strength required for Slipform application,

2 Kg / cm2 - When releasing the Form

4 Kg / cm2 - When coming out from the Form

20 Kg / cm2 - After 24 hours since pouring

200 Kg / cm2 - After 28 days

Monday, 6 August 2018

SLIP FORM : Introduction

Slipform has been accepted as a precise construction technique within acomparatively short period of time – an indication of its considerable popularity. This popularity has in turn encouraged further research ensuring the adoption of new methods and modern materials, which have firmly established slipforming as an economical, rapid and accurate form of construction. Now that it is properly developed, the technique can be applied to many different forms of structure, including tapering formations with straight or parabolic profiles incorporating constant reductions in wall thickness. Traditional applications for slipforming are silos, chimneys, bridge piers, water towers, special application like construction of pylons, lift core wall of building, lining for tunnel shaft, framed structures etc.,



Principles of Slipform


Slipform construction, also referred to as sliding form construction, is similar to an extrusion process. Plastic concrete is placed in the forms, and the forms act as moving die to shape the concrete. Once the form has been filled with fresh concrete and hardening has started the form is gradually raised by the lifting devices on which it is suspended. The rate of movement of the form is regulated, so that the forms leave the concrete after it is strong enough to retain its shape while supporting its own weight. Pouring of concrete, tying of reinforcement, fixing of openings/inserts etc., are performed gradually from a working platform. An average sliding speed of 200 mm an hour is common, rising to 300 mm an hour under the best conditions and 100 to 150 mm an hour when large or complicated structures are being slip formed.

Monday, 7 May 2018

How To Do Mix Design Of Concrete As Per IS Code 10262 | SSD Condition | Moisture Content Condition


 The process of selecting suitable ingredients of concrete and determining their relative proportions with the object of producing concrete of certain minimum strength and durability as economically as possible is defined as MIX DESIGN. The main role of mix design is to achieve the stipulated minimum strength and durability and second object is to make the concrete economical.

Here is a video by Er. Mukesh Sah from L & T - Learning Technology, explaining How To Do Mix Design Of Concrete As Per IS Code 10262 in SSD Condition & Moisture Content Condition. Watch the video carefully.






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NOTES SNAP - SSD CONDITION
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NOTES SNAP - MOISTURE CONTENT CONDITION
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LEARNING TECHNOLOGY is a Brand YouTube channel which contains Technical Lectures on "Civil Engineering" from personal field experience. This Channel is maintained by Civil Engineer MUKESH SAH. You can follow him by subscribing channel and HIT the bell for latest updates.
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Sunday, 1 April 2018

Determination of Specific Gravity of Cement by Specific Gravity Bottle

OBJECT OF EXPERIMENT


The object of the experiment is to determine the Specific Gravity of Cement by Specific Gravity Bottle. Specific Gravity of cement is the ratio of the mass of unit volume of cement at a stated temperature to the mass of the same volume of gas free kerosene at a stated temperature.

APPARATUS


1. Weighing balance
2. Specific Gravity Bottle
3. Kerosene
4. Cement

PROCEDURE


1. Weight empty Specific Gravity Bottle.
Weight of Empty Specific Gravity Bottle = .................... (W1)
2. Fill the half Specific Gravity Bottle with cement and weight it.
Weight of Specific Gravity Bottle + Cement = .................... (W2)
3. Now fill the remaining half portion of Specific Gravity Bottle with Kerosene oil and weight it.
Weight of Specific Gravity Bottle + Cement + Kerosene = .................... (W3)
4. Now empty the Specific Gravity Bottle and wash it properly. Then again fill the bottle completely with Kerosene oil and weight it.
Weight of Specific Gravity Bottle + Kerosene = .................... (W4)

DATA ANALYSIS


Calculate the Specific Gravity of Cement using the following formula :

SPECIFIC GRAVITY = (W2 - W1)/(W2 - W1) - (W3 - W4) * 0.79

WHERE, 0.79 = Specific Gravity of Kerosene oil.


Here is a Video By LEARNING TECHNOLOGY, which explains very beautifully about the process of determination of SPECIFIC GRAVITY & WATER ABSORPTION OF FINE AGGREGATE


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For more Information and Videos, Visit LEARNING TECHNOLOGY
LEARNING TECHNOLOGY is a Brand YouTube channel which contains Technical Lectures on "Civil Engineering" from personal field experience. This Channel is maintained by Civil Engineer MUKESH SAH. You can follow him by subscribing channel and HIT the bell for latest updates.
Share, Support, Subscribe and Like !!!
Visit His Official Websites, Facebook Fan Page and Twitter.
For Business Enquiry and Help, You can Email him.