Details of top down construction method

Under top down construction method, the basement concrete slabs function as lateral bracing toward the perimeter wall system. Ground level and first basement slabs are poured, with access holes left to facilitate excavation below. Since every succeeding sub-grade level is finished, the floors perform as lateral bracing toward the perimeter wall system.

Top-down method is mostly suitable for two types of urban structures, tall buildings containing deep basements and underground structures like car parks, underpasses and subway stations. In such a circumstance the basement floors are built up as the excavation steps forward.

The top/down method is utilized for deep excavation projects where tieback installation can’t be done and soil movements should be reduced. Top-down construction method saves the entire construction time. So, it is mainly implemented for some major projects where time is a key factor.

The sequence construction starts with retaining wall set up and then load-bearing elements to support the future super-structure. The basement columns (generally steel beams) are built up prior to starting of excavation and rest on the load bearing elements. These load bearing elements normally belong to concrete barrettes constructed under slurry (or caissons).

Construction method: Given below, the detail construction method for top down construction :-

• Built up the retaining wall.
• Build up piles. Arrange the steel columns or stanchions where the piles will be developed.
• Carry on the first phase of excavation.
• Cast the floor slab of first basement level
• Start to build up the superstructure
• Carry on the second phase of excavation; cast the floor slab of the second basement level.
• Reiterate the similar method unless the required depth is attained.
• Develop the foundation slab and ground beams, etc. Finish the basement work.
• Continue constructing the superstructure unless it is completed.

To learn the step-by-step process in detail, go through the following video presentation.

Video Source: geobuuk

~~~~~~~~~~~~~~~~~~~~~~~~
Published By
Rajib Dey
www.constructioncost.co
~~~~~~~~~~~~~~~~~~~~~~~~

Brief information on Project Cost System

If the design is modified at the design stage of a construction project, the project costs are constantly estimated and evaluated to keep the project costs within the budget of the owners. This working budget is normally known as the engineers or architects estimate. As soon as the design is completed, the field cost-control system is prepared with a final, detailed cost estimate of the total work.

This type of cost estimate is generally created by the construction contractor or another party who will be directly associated with the field operations. The contractor estimate is then abridged to a working construction budget and develop the foundation of the construction cost control system.

While the construction process is going on, cost accounting methods are utilized to recover actual construction expenses from current construction operations. This information is then applied for the purpose of controlling the cost on the current project and for working out the cost of future projects. Besides, the cost system offers significant information related to project financial control.

Preliminary Cost Estimates: Preliminary estimates of future construction expenses, are prepared throughout the project planning and design stages on the basis of approximation because these are accumulated prior to define the project entirely. This type of conceptual estimates differs from ascertaining the final detailed estimate of construction costs.

Basically, all conceptual price estimates are prepared on the basis of some system of gross unit costs which are acquired from earlier construction work. These unit costs are guessed forward in due course to focus on present market conditions, project location as well as the specific character of the job currently being considered. The following methods are followed to make preliminary estimates.

Cost per Function Estimate: This analysis is produced on the basis of the estimated expense per unit of use, like cost per patient, student, seat, or car space.

Construction expense may also be guessed like the average outlay per unit of a plants manufacturing or production capacity. These factors are normally applied as a method of instantly characterizing facilities costs at the setting up of a project when there is only raw marketing information, like the number of patients retained by a planned hospital. This extensive method of producing costs can also provide a powerful control on more detailed estimates as soon as they are created.

Index Number Estimate: This method is applicable for working out the price of a projected structure by upgrading the construction cost of the same type of current facility. It is performed by multiplying the original construction cost of the current structure with a national price index that is modified as per local conditions, like weather, labor expense, materials costs, transportation, and site location. A price index refers to the ratio of current construction cost to the original construction outlay for the type of structure concerned. Various types of price indexes are available in different trade publications.

Unit Area Cost Estimate: Under this type of method an approximate cost is selected with an estimated price for each unit of gross floor area. The method is found extensively in building and residential home construction. It offers a perfect rough calculation of costs for structures which are standardized or contain a large sampling of historical cost information from equivalent structures. This type of estimate is frequently applied in the industry to tally the relative value of different facilities.

To gather more information, go through the following construction article onlinecivilforum.com

~~~~~~~~~~~~~~~~~~~~~~~~
Published By
Rajib Dey
www.constructioncost.co
~~~~~~~~~~~~~~~~~~~~~~~~

How construction projects are completed successfully before schedule with Microsoft HoloLens Technology

Now-a-days builders are using digital technology like Microsoft HoloLens in their construction projects to visualize projects and detect any omission earlier and save huge savings in overall construction costs.

As for instance Gilbane, a leading commercial construction firm, used HoloLens to examine a mockup of a project. It was detected that steel frames the company intended to order to provide support to walls of the building were excessively long to match the design. Being able to detect the issue earlier, the company instructed the supplier to trim the frames shorter in the shop in spite of changing dozens of tracks that would retain the frames in place. Thus, Gilbane saved roughly $5,000 in labor costs.

HoloLens can arrange holographic images in its user’s physical environment and improve the efficiency so that the project can’t run over budget and behind schedule.

This easy-to-use estimating sheet contains database sheet where all the records for material and labor names, rates, and lbr factors can be entered. To perform this, just choose the required material/labor and put the amount while making the estimation. One can create as many work stages as per choice and get complete view of all of the material/labor costs with individual stage and total cost.

HoloLens is applied prior to develop a building to identify mistakes in the way ducts and pipes are arranged in office ceilings. It is a complex system that frequently captures more room than projected.

HoloLens facilitates the builders to easily move any 3d image of the project, enlarge the size of the model significantly, walk through the details of the actual construction, toggle diverse views on and off to see the detailed architectural and structural images together with mechanical, electrical, and plumbing systems.

~~~~~~~~~~~~~~~~~~~~~

Published By

Rajib Dey

www.constructioncost.co

~~~~~~~~~~~~~~~~~~~~~

BSF admixtures help to maintain sustainability in concrete and cement

Both concrete and cement play an important role for several construction projects. Concrete is primarily formed with cement, water and grains of stone. Cement is developed by mixing calcium silicate with portions of aluminum and iron compounds.

The following construction video explains the total procedure for creating these materials.

This animated construction video also focuses on the functionality of concrete superplasticizer Glenium to make the best use of these materials for making concrete more flexible, long-lasting and resilient.

BASF Glenium superplasticizers enhance the structural properties of concrete as well as its eco-friendliness.

By applying BASF's concrete admixture Glenium, up to 50 percent of the cement clinker is substitued with other materials. These materials consist of fly ash, a byproduct of coal-fueled electric power plants, or blast furnace slag obtained throughout steel production and recycled for these purposes. Thus, Glenium admixtures facilitates savings of up to 60 percent carbon in concrete production. So Glenium is very vital element to reduce carbon emissions in cement production.

~~~~~~~~~~~~~~~~~~~~

Published By

Rajib Dey

www.constructioncost.co

~~~~~~~~~~~~~~~~~~~~

Go Figure, the latest mobile based application, can make a revolution in construction estimating process

A new mobile based application known as Go Figure Estimating Application launched by a Massachusetts company that will make a sea change in the construction estimates.

The developer teams of Go Figure consist of contractors for contractors, insurance adjusters, roofing, siding window vendors and more. The software helps the construction estimator to get rid of complicated and time consuming procedures of precisely estimating construction projects and quantify, cost and systematize construction projects 15 to 20 times faster.

Snap a picture of any construction through your iPad and select an item like carpentry, roofing, painting or any of the hundreds of other preloaded jobs from dropdown lists. After that locate the regions to be calculated on the touchscreen. The Go Figure will estimate every dimension of the construction, combine the quantities and generate easily accessible worksheets to work out costs. When the users select from the dropdown menu every time, then it will automatically put in contract language into a proposal.

The software also includes uncomplicated point and shoot interface involving the automatic proposal and stock-list generation which produce a commanding platform to simplify any construction project. The mobile printing package facilitates contractors to take print of the professional proposals on site.

Download a free trial

~~~~~~~~~~~~~~~~~~~

Published by 
Rajib Dey
Content Writer
www.quantity-takeoff.com (Get all types of estimating sheets, softwares, directory, news, building codes)

Like us on facebook
https://www.facebook.com/quantityestimating