The EPC Contractor shall complete the design work in accordance with the contract and meet the requirements of the owner’s expected function and schedule specified in the contract, and organically combine the design with procurement, construction, operation and maintenance, so as to realize the value-added of the project and improve the economic benefits of the project.
Design achievement documents are the basis of procurement, construction, completion acceptance and operation and maintenance.
(4) Based on the dynamic analysis of BIM forward design bill of quantities, cost control measures make full use of advanced technical means for cost calculation, and the cost list automatically generated by accurate BIM three-dimensional model changes automatically with the modification of BIM model, which can be timely provided to the cost team for real-time calculation, so as to quickly provide accurate cost basis for design change, so as to The design change decision time is greatly shortened.
The investment and quantities approved in the previous stage shall be decomposed to each discipline first, and then to each unit project and divisional project.
The construction unit shall establish a design optimization reward system, share the profits brought by the design optimization results with the design unit, and improve the initiative of the design unit in design optimization.
The unreasonable design progress leads to the delay of construction progress.
▌2.
(3) Cost comparison among the owner, the designer and the constructor in the current housing construction field, for EPC projects, the government generally adopts the preliminary design estimate approval before contracting.
Therefore, the general contractor shall deal with the contracting price and clear quantities when bidding for the project Make careful calculation on the sheet to clarify the expected profit.
Although the construction unit has the advantages of strong management ability, excellent total cost control and high risk resistance, the design part that plays a leading role in the EPC project is its weakness 1 – main issues} design is one of the core works of EPC project.
The design management team shall calculate the construction cost according to the design results to see whether it meets the construction cost estimated at the time of bidding.
The construction team shall calculate the profit in combination with the purchase price of the project list, and put forward design optimization opinions on this basis, so as to achieve the best economic effect on the basis of meeting the specification requirements and the expected functions of the owner.
Therefore, good engineering design management is the key to complete “cost, progress and quality”.
It often does nothing for the management of the design unit, and simply takes the Consortium Agreement signed with the design unit as the management basis, The design results are required at the agreed time node without actually participating in the design management, thus losing the core advantages of EPC project and failing to organically combine design, procurement and construction 2 – solution ▌ 1 Quota design based on multi-party and multi-stage collaborative calculation (1) The construction unit establishes a cost team specialized in serving the EPC project.
The project cost is easy to exceed the estimated budget.
At the beginning of design, the cost team cooperates with the design unit to carry out economic comparison and selection of various design schemes, so as to provide economic data support for the selection of design schemes, completely get rid of the traditional design method that completely depends on the experience of designers, and clarify the profit points and loss points of each professional division and sub item.
About 60% of the project cost is implemented through the workload determined by the design, while the impact of the construction stage on the overall cost accounts for only 5% – 10%.
▌1.
Under the traditional construction mode, the construction unit lacks engineering personnel who understand design and design management, and there is no corresponding design management structure.
With the government vigorously promoting the EPC mode, a number of powerful construction units have transformed from the traditional EPC mode to the EPC mode, and as the leader of the consortium, they undertake the EPC project together with the design unit.
Although the proportion of design cost in the general contracting of the project is very small, the rationality and economy of the design scheme often determine the economy of the project, and then directly determine the total investment of the project.
(2) In the principle of prudent control of the total cost in stages, the preliminary design shall be controlled according to 70% of the approved design specification and investment estimation, and the construction drawing design shall be controlled according to 90% of the approved total estimate of the preliminary design.
The design progress is an important part of the overall progress of the project, and the reasonable design progress is the guarantee of design quality.
If the construction unit, as the leader, fails to manage the design progress according to the EPC mode, and still advances other work after all the design results are completed according to the traditional mode, it will inevitably lead to the delay of construction period, It completely loses the advantage of cross implementation of EPC project design, procurement and construction to speed up the project construction progress.
High quality responsible coordination and control of design progress (1) implement the preconditions for the development of design work.
▌3.
On the premise of ensuring the use function, according to the limit The scheme shall be screened and designed according to the fixed amount to ensure that the total investment will not be exceeded.
This mode has clear quantities, easy cost calculation, easy risk control, and easy access to expected profits.
Finally, the cost calculation results of the above stages shall be compared with the project settlement audit list to test the accuracy of cost calculation of each stage.
Therefore, when the construction unit, as the leader, can not effectively manage the economy of the design, and the design is only carried out by the design unit based on experience, the total project cost will inevitably exceed the estimated budget.
In the design process, the real-time calculation of quantity and price shall be realized according to the design drawings, and the addition and subtraction of cost shall be combined, so as to control the economy of the project in the overall situation.
▌2.
However, due to the construction unit’s lack of design talents and lack of understanding of design specifications and design processes, the following problems often arise.
There is no management organization structure suitable for EPC project and design management is carried out with the thinking of general construction contracting.
The design management team shall fully understand the functional requirements of the owner, jointly complete the approval process before the design of various construction projects with the design unit, and implement various external cooperation conditions and municipal interface conditions to remove obstacles for the development of design work..
