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Showing posts with label wall. Show all posts
Showing posts with label wall. Show all posts

Wednesday, June 5, 2019

Advantages of cross wall construction

Cross wall construction stands for a building construction method. Under this system, the precast load-bearing walls are arranged perpendicular to the lateral axis of the building.
In cross wall construction, the load-bearing walls provide support to the floors, roofs and the beams. The structures built up with the cross wall method are structurally strong and cost-effective.
Given below, the construction details and the features of cross wall construction :-
Features of Cross Wall Construction: Under cross wall construction, the prefabricated walls are arranged in series. These load-bearing walls transmit the structural loads securely to the foundation devoid of any concrete or steel frame. They also serve as shear walls and safeguard the building against lateral movement.
Cross wall construction is ideal for the buildings which contain maximum of 5 stories where all the floors come with similar plans. The intermediate floor span among the load-bearing walls offers adequate lateral control.
If both the load-bearing walls and the floors belong to precast members, then a series of boxes should be created. This type of construction is normally defined as box frame construction.
Cross Wall Construction Systems:
1. Precast materials can be sent at the right moment.
2. The precast wall components are arranged both horizontally and vertically. They are grouted and attached according to the plan through hidden joints and ties.
3. Prior to finish the complete structure, mechanical & electrical installation works, finishing works and other multifaceted works on the walls should be finished.
The cross walls are attached with any of the following key connections:
1. Wall-to-wall by Horizontal Joints
2. Wall-to-wall by vertical joints
3. Wall to the base foundation
When the cross walls are placed along the floor, the front and the rear walls can be non-load bearing claddings. The connections among the non-load bearing walls and the cross walls should be designed and built up with a proper care to avoid moisture infiltration and other issues.
Advantage of Cross Wall Construction:
1. Cross wall construction forms a long-lasting structure.
2. The initial construction cost is fewer.
3. With regard to conventional construction method, cross wall construction method save huge time and cost.
4. The building built up is structurally strong that contains greater fire and acoustic separation among the nearby rooms.
5. The construction achieves good thermal mass.
6. Site co-ordination is simple at the time of providing cross wall construction.
7. The structure ensures superior security.
8. The maintenance cost of the structure developed with cross wall construction method is fewer.
9. No scaffoldings are required for cross wall construction.
10. The structure remains monolithic with good air tightness.
Advantages of cross wall construction

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Published By
Rajib Dey
www.constructioncost.co
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Saturday, April 6, 2019

Importance of pre-pour cards for concrete placement

Pre-pour checklists are very crucial for proper concrete placement. There should be an authentic verification and checking method to make sure that your next concrete placement is accurate. Without a pre/post pour checklist, huge is money is lost due to inappropriate lighting, incorrect mix design, slump, spacing, manpower etc.
In a pre-pour checklist, the following items should be included :-
1. Fill out as soon as the pour is already finished.
2. Fill it out 5 minutes prior to the pour
3. Left blank
4. Don’t have/use one.
Then it is required to re-assess what a good pre-pour checklist can achieve.
To make a pour card effective, the perfect process should be developed while running through the checklist. A perfect pre-pour process will achieve all the steps and the: Who, What, When, Where, How”.
Who: has verified, examined, checked, and figured: yardage, elevations, sleeves, anchor-bolts, embeds, reinforcing, elevations, mix design etc.
What: is being placed, size of pour, manpower required (footing, wall, column, SS, SOG, S.O.M.D)
When: is the pour occuring (Date, Time, truck spacing)?
Where: (Placement location, pump truck setup, truck route, wash out bin)
How: is it being placed (pump, screeds, equipment, lighting, safety, etc.)?
The pre/post pour cards facilitate a simple check and verifications. While a detailed assessment and paying special attention to detail and passing through all the steps to checkoff is accomplished, it will save your significant time and money and re-work as well as allow you planning and performing a effective pour.

Importance of pre-pour cards for concrete placement
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Published By
Rajib Dey
www.constructioncost.co
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Wednesday, July 5, 2017

How to examine brickwork in a wall

After completion of brickworks, it is required to examine the brickworks with the following four steps:
• Gauge - Examine the height of the course
• Level – Ensure that the perfect level is maintained for course 
• Plumb – Ensure that the wall is vertical
• Straight - Ensure the wall is straight

These examination works should be initiated while each course is placed and in this order to certify that the previous checks remain unaffected.
Gauge: While going to develop any wall, it's required to retain the courses at the corners at the equivalent height with the help of a gauge board.
Demarcate a piece of timber with marks similar to gaping of one brick height as well as the density of the bed joint (generally a total of 75cm).
Utilize the rod at the corner when each course starts and verify that it maintains the exact height, on uneven ground, begin by providing a datum peg next to the wall in order that the gauge rod is place smoothly.
Level: To maintain the exact level of the course, apply a spirit level. As the corner bricks are arranged to the proper height, so any modification is made by accomodating the bricks in from the corner. Bricks are not developed with very tight tolerances. Therefore, just level the portions of the bricks which connect the base of the spirit level.

Plumb: Verify that the wall face is vertical with the use of a spirit level, tap the brick over the wall as required to modify the brick as per requirement. It should not be done for both sides of the wall, select one side as 'the face' and just plumb that side. Perform it along the wall, placing the points roughly just under the length of the spirit level.
Examine both sides of corners.
Straight: Apply a straight edge among the points which are plumed earlier to straighten the course. Tap the bricks as required.
Similar to plumbing the wall, only examine the face of the wall without straightening both sides.
It is not possible that the straight edge will connect every brick over its whole face, attempt to have the centre of each brick to connect the straight edge and the two ends of the brick approximately positioned from it correspondingly.





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Published By
Rajib Dey
www.constructioncost.co
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Thursday, February 2, 2017

How to design R.C.C lintels

Now-a-days, the R.C.C lintels are mostly recognized to extent the openings for doors, windows, etc. in a structure owing to their firmness, inflexibility, fire resistance power, cost-effectiveness and simplicity in construction. R.C.C lintels are recommended for all the loads and for any span. The width of lintel is similar to width of wall. Depth of lintel is based on the length of span and magnitude of loading.

Lintel can be made from various materials. Such as steel, wood, stone, RCC, etc.

Generally, the most effective material for lintel is RCC (Reinforced Cement Concrete). Generally, applied concrete ratio for RCC lintel is 1:2:4.

On the basis of the casting methods, RCC lintel is classified as Pre-cast RCC lintel and Cast-in-place RCC lintel.

DESIGN METHOD OF R.C.C LINTEL

There are similarities between the design methods of a lintel (single span or continuous having a few openings) and the design methods of a simple beam.

1. The lintel width is same as the wall thickness.

2. Provide an appropriate depth of the lintel.

3. Select the operational span of the lintel (maintain rational end bearings and real depth).

4. Assume W as the aggregate weight of the masonry work wrapped in the triangle, supposing that conditions authorize triangular load of the workmanship on the lintel.

5. Estimate the extreme bending moment (M1) at the centre of the lintel ( because of the triangular load).
M1 = Wl/6

Now estimate the maximum bending moment (M2) because of the self-weight (w) of the lintel per metre length.
M2 = wl^2/8

To read the complete article, go through the following link www.dailycivil.com

How to design R.C.C lintels

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Published By
Rajib Dey
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