Advantages And Down sides Of Design And Build Method Engineering Essay

While construction contracts serves as a means of pricing engineering, they also structure the allocation of risk to the various parties involved.

The engineering field is an extremely comprehensive and unique in each job. In this world the majority of the tasks are been able by deals.

And as a principle to manage the job effectively we have to first manage the agreements.

The owner has the sole capacity to decide which kind of deal &delivery method should be utilized for a particular facility to be made and to set forth the terms in a contractual arrangement.

A firm must choose the best delivery method which is job to project bottom and present its bet offer to the engineer/customer during tendering stage to allow it to provide competitive price and win the task without diminishing the practical and the quality of the task.

Choosing the right solution to deliver the job will reduce the project execution and present flexibility during building as well as saving cash and time for a firm and eventually the same to the dog owner.

It is important to comprehend the potential risks of the contractors associated with different kind of delivery methods.

In this instant you might ask the actual deal delivery methods are and we have to choose the right delivery methods.

Projects delivery methods.

There are three types of task delivery methods. Within this section we will focus on design and Build since it s the most practical method for small and medium assignments.

1- Soft or design-bid-build method

In this kind the owner/consumer will choose engineer to design the whole task and get the

Approvals from authorities then floating sensitive to choose suitable builder for the Construction under his supervision.

In this type of method the client /engineer has full control of the project and the contractor has to comply with full design distributed by the engineer.

Most suitable type of contract because of this method is lump sum contract that your price distributed by the Builder is set and the complete project is already designed and the range of work is clear and totally detailed.

2-indefinite quantity agreement method

Under this kind of agreement there shall be no design which is predicated on maintenance or mending projects.

Under this agreement the owner and the service provider will upfront set up charges for the labors and Equipments and markup etc

3- Design and build method.

The term "design-build" identifies a variety of alternatives to the traditional project delivery system.

A useful way to check out design-build is by what it is not. Traditional design-bid-build is a segmented, sequential process where the owner first contracts

With a design professional to get ready detailed, suitable-for-construction programs and specs (or Sometimes has them made by its in-house engineers), then uses the in depth plans and Technical specs to solicit competitive bids for construction, and lastly awards the structure Contract to the low bidder.

Design-build' means a procurement process where both the design and structure of

A job is procured from an individual contractor.

Usually, the design-build agreement is awarded by some process apart from competitive bidding Providing the cost effective (in price, features, functions [and] life-cycle costs)

Thus, design-build differs from traditional design-bid-build in two ways. First, the look and structure components are packaged into an individual deal. Second, the single contract is not necessarily awarded to the low bidder after competitive bidding

I-Why Design-Build? (Advantages)

Potential Cost Savings

Design-build has the potential to lessen over-all project cost because the design-build company performing the look has a much better feel for the structure cost of various alternatives, Thus will come up with a design that is less costly to make and comes with an incentive to take action. Another way to check out this advantage is that it moves value engineering "cost lowering incentive"

After contract award (with the builder proposing cost-reduction ideas and sharing the savings with the dog owner) to pre-award (with the owner enjoying almost all of the cost savings).

B. Earlier Project Completion

Design-build may cause earlier completion and occupancy of the job because there is no Dead time between completion of design and begin of engineering. Further, the design-build Company can begin engineering of early stages of the job (e. g. mobilization, site utilities, Foundations) before design of later stages (building envelope, interior partitions, HVAC, electro-mechanical) Is 100 percent complete? This technique sometimes is known as "fast record. "

C. Reduced Statements Exposure

Design-build eliminates the liability gap. Design experts can obtain insurance plan only for negligent errors and omissions, and virtually all design contracts limit the designer's responsibility to such.

However, there can be non-negligent problems and omissions, which cost the dog owner money but for which the design professional is not liable. For example, a design professional may embark on Realistic subsurface investigations but fail to detect a rock outcropping that will require additional work.

In the original design-bid-build approach, the owner warrants the correctness of the programs and Features to the structure contractor.

There can be design faults for which the proprietor is liable to the structure company under the Guarantee of correctness but cannot copy the liability to the design professional.

Even when the custom is in fact negligent, proving negligence can be difficult.

The owner must get yourself a qualification of merit from another design professional and then verify that the custom failed to meet up with the suitable professional standard of attention, which requires expert testimony.

On the other side, the company usually can confirm there is a defect in the ideas that cost the Service provider money predicated on fact testimony together.

Thus, the dog owner may have to bear the price.

Design- build eliminates this distance because the design-bid build entity has no person but itself to be blamed for defective plans and requirements or differing site conditions.

D. New Technologies

Public Contracts usually prohibits brand-name or model-number specifications unless the

Specification lists at least two brand names and is followed by the phrase "or equivalent. "

This helps it be difficult for traditional design-bid-build to attain innovative, proprietary

Products where there could be only one brand-name no equal.

Further, substitution of a new "or equivalent" product for a typical product often is impracticable Because of the ripple effect.

The developer designs the project around current technology Products and substitution of new "or similar" products after bidding can require revisions to structure, mechanical or electric powered components to support the new product.

Who will purchase these ripple changes? Design-build resolves this problem.

The design-build builder selects the equipment (right down to make and model quantity) and Then designs the building surrounding the selected equipment, which really is a more rational way to move forward.

In simple fact, the design-build contractor will often obtain free design the help of equipment Manufacturers desiring that their new solutions be used.

E. Over-All Job Optimization

Design-bid-build can suffer from sub-optimization when individual project participants improve their own positions, often at the trouble of the over-all project.

The total cost to the owner of a building aspect, such as the steel frame, includes the price of the engineering to look for the required steel areas plus the price of the material.

The artist has little incentive to use a sharp pencil to attain the minimum amount of

Structural material; he optimizes his own position by spending only the design time necessary to Ensure that there is enough steel to meet gravity and seismic tons, often by employing Conservative assumptions that may cause more material than necessary.

So, the owner may save money on design but pay for it in steel.

With design-build, on the other hand, the design-build entity comes with an incentive to use the Perfect amount of anatomist. So long as an additional buck of engineering helps you to save several dollar's price of material, the design-build service provider will spend the executive time until of diminishing profits when yet another dollar's worth of engineering will save only a Dollars s worthwhile of material because both the cost of design and the price tag on steel emerge from the same pocket.

This is not to say that design-build leads to flimsy or less-safe constructions. "More" (material,

concrete, etc. ) is not necessarily "better. " Simply specifying extra metal or concrete in one place because the engineer doesn't have enough time or incentive to calculate exactly how much is in fact required does not increase the over-all performance of the building.

"A chain is only as strong as its weakest link. " If the owner wishes a building with higher floor Loadings, less floor deflection or level of resistance to a bigger earthquake than required by code, then The way to achieve this is by inserting that need on the design-build entity in advance not by Expecting that the custom made will throw in a few extra steel or concrete because she or he doesn't have amount of time in the budget to employ a sharp pencil.

F. Reduced Administrative Burden

Design-build may decrease the administrative burden on the owner since there is one solicitation, one award and one contract to manage.

G. Previously Cost Visibility

The total cost of the task is apparent previously with design-build. In traditional design-bid-build, Structure costs are not known until bet opening, which is possible to invest money on the design that the firm cannot afford to develop. All too often, construction bids go over the budget, and the Project must be re-designed to bring it within the budget, thus delaying conclusion.

H. Company CM with Multi-Prime Contracts

One of the benefits of design-build can be achieved by a building management (CM) to control design and over-all project coordination and then contracting straight with several contractors, that are then supervised by the CM.

Construction task management s services provided by the licensed architect, recorded engineer, or certified general company.

Under this approach, the early stages of the project (earthwork, site utilities, and foundations) can be put under deal before design of the building shell and interior is 100 percent complete, and the structural steel and other long lead-time components can be bought.

Then, the contracts for the early stages can be granted to follow-on contractors.

There are two types of development managers.

An company CM is a expert to the dog owner; a company CM is not in the chain of privity between The owner and the contractor(s) and will not guarantee the expense of the work.

An at-risk CM, on the other side, essentially is a brokering standard contractor.

The at-risk CM is either in the string of privity between the owner and the trade contractors or Guarantees that the aggregate price of the agreements will not go beyond some maximum figure.

Any individual or strong proposing to provide development project management services shall provide Proof that the average person or firm and its personnel undertaking onsite responsibilities have Experience and experience in engineering project design review and analysis, construction Mobilization and guidance, bid evaluation, task scheduling, cost-benefit evaluation, promises Review and negotiation, and basic management and supervision of a structure project.

Which kind of contract is better for design-build?

Most suitable kind of agreements is lump total contract because the owner has essentially designated all the risks to the contractor, who in turn should be expected to require a higher markup in order to take Care of unforeseen contingencies.

Beside the set lump amount price, other commitments tend to be created by the contractor by means of submittals such as a specific plan, the management reporting system or an excellent control Program.

If the genuine cost of the task is underestimated, the underestimated cost will reduce the Service provider s profit by that amount. An overestimate has an opposite result, but may reduce the Chance of being truly a low bidder for the task.

The opportunity of work, the purchase price, the time of performance has already been defined.

Usually the contractors include allowance for contingencies in their bet price so the price

Small and medium jobs are most suited to this type of job where is the look is straightforward not Complicated and can be monitored by one party.

II-disadvantages

The potential advantages of design-build do not come without risk.

A. Less Control.

Under traditional design-bid-build, the owner has full control over the details of the programs and Specifications and will not release them for bids until it is satisfied that they reveal its Requirements, including efficient and aesthetic preferences.

With design-build, the owner gives up some of this control. i. e. , improving the level of design through the look development stage (30 percent or so) before award of the design-build contract.

Of course, in so doing the owner may give up some of the advantages of design-build.

B. Need for Early Requirements Definition

With design-build, the owner must lock in its requirements much before.

With traditional design-bid-build, if the owner is just a little fuzzy on its efficient or aesthetic Requirements, it can clarify them through the design stage after if considers where the artist is going.

But with design-bid-build, post-award programmatic changes can be very expensive and disruptive.

C. Recommendation

So, if the city (country) rules aren't certain what it needs, traditional design-bid-build may be the better alternative.

D. Conformity with Subcontractors

The Subletting and Subcontracting Fair Practices Take action, requires that bidders list their subcontractors using their bids. This can be a problem for a design-build bidder. Without detailed design drawings, the subcontractors cannot accurately calculate costs.

But, listing a subcontractor with out a company subcontract price places the design-build company at a downside in subsequently rates the subcontract work.

A detailed subcontractor gets the prime design-build company in the proverbial barrel. This is a workable problem for a design-build builder with lots of the same kind of projects within an Area, as a subcontractor can only just get away with gouging the design-build entity once.

Parking garages and casing are cases of where the design-build entities work with a group of subcontractors on the recurring basis, and subcontractors can calculate their focus on a perspace. or. pre-square. feet. basis.

Design-build contractor shall search for competitive bids for subcontracts not listed with its excellent bid.

The problem with this process is the fact that it will depend on specific legislative authorizations that not connect with the country.

Thus, the safest procedure may be to require report on subcontractors at time of bid, even though this might cause either the subcontractors or the perfect design-build entity including some contingency and mark-up.

E. Repayment bonds

Generally it is required a payment bond payable by the terms of the agreement.

However, when the look services and the engineering are procured under a single contract, must the payment bond be in the full amount of the design-build deal or only in the amount of the Construction portion? Logically, it could seem that 100 percent of the development section would fulfil the purpose of the statute.

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