Construction preparation of engineering project is an important part of construction production, which is the overall arrangement of project objectives, resource supply, construction scheme selection and its spatial layout and time arrangement, and the fundamental guarantee for the smooth progress of civil engineering construction and equipment installation. Therefore, it is very important to make technical preparation, material preparation, labor organization preparation, construction site preparation and off-site preparation before construction, so as to reasonably supply resources, speed up construction, improve project quality, ensure construction safety and win social reputation. To strengthen project schedule control, we must attach great importance to project preparation and do a good job in preparation before construction. 2, according to the requirements of the project contract time limit for a project, according to the contract time limit for a project construction schedule, complete the construction task, this is both the contract requirements and the need to achieve business goals. At this point, the interests of both the construction unit (owner) and the construction unit are completely consistent. Therefore, it is the basic duty and main work content of the project manager to strengthen the construction progress control and ensure the performance of the contract period. Planning is the premise of control. No plan, no control. Control is to compare the actual value with the planned value, find out the deviation during the period, and then make feedback adjustment. Working out the construction progress plan is to determine a planned value to control the construction period and work out effective measures to ensure the implementation of the plan, so as to ensure the completion of the contract construction period. 3. The preparation of project schedule is based on long-term experience in construction production management and theoretical knowledge of construction schedule control. In my opinion, the basis of the project construction plan is (1) the project contract. The stipulation of the construction period in the contract is the basic basis for determining the planned value of the construction period, and the commencement and completion dates of the project stipulated in the contract must be implemented through the schedule. (2) The construction organization design of this project. These data define the construction capacity allocation and construction organization method, reflect the construction characteristics of the project, and thus become the basis for determining the target plan of each stage in the construction process. (3) The enterprise's construction, production and operation plan and project schedule plan are an integral part of the enterprise plan, which should be guided by the enterprise management policy and meet the requirements of the enterprise's comprehensive balance. (4) Project design schedule. Drawings are the foundation of construction, and the construction progress must be connected with the design progress, and the construction time of corresponding parts must be arranged according to the delivery date of each part of drawings. (5) Material and equipment supply plan. If there is already a supply plan for materials, equipment and turnover materials, then the project construction progress must be coordinated with it. In addition to the above five points, we should also consider the preparation of the project schedule as the main basis, and at the same time pay attention to the information about the site construction conditions, including the hydrological, geological, climate and environmental information of the construction site, as well as traffic conditions, energy supply and auxiliary production capacity. Before compiling the project construction schedule, we should also collect, carefully analyze and sort out the actual construction progress of similar or similar projects, as well as the actual construction progress of similar or similar projects that have been built, list the control constraints, and clearly influence the construction period to reach the mandatory construction period, so as to make full preparations for compiling the project schedule. 4. The preparation of the project construction schedule network plan has obvious logic, which can not only clearly express the work content and time arrangement in the project control schedule, but also clearly express the internal relations and constraints between the work, and can analyze and optimize the plan with digital methods, so the network plan has better and more advantages than the horizontal plan. "Network planning technology" has been more and more widely used in the control of construction period of construction enterprises. In the process of project construction task, the order of each process and the relationship between them are called the logical relationship between processes. These logical relationships can be divided into two categories: (1) those determined by construction technology are called process logic. The construction technology remains unchanged, and the process logic remains unchanged. For example, in the construction of a general house, according to the usual construction technology, the wall can always be built after the foundation is completed, the floor can be paved after the wall is built, and the second floor can be built after the first floor is built, and so on. As long as the construction technology remains unchanged, the above logical relationship will not change. (2) What is determined by the construction organization method is called organizational logic. This logical relationship can often change with the change of construction conditions and construction organization methods. For example, organize the construction of two residential buildings, first dig the geosyncline of Building A and then dig the geosyncline of Building B, and lay a good foundation for Building A, so that the order relationship between Building A and Building B is determined by the organization mode of flowing water construction, and it is also likely that the construction strength is limited and it is impossible to carry out the construction of two residential buildings at the same time. If there is enough construction strength, other conditions may be possible. In order to shorten the total construction period, two residential buildings can also be constructed at the same time. Defining logical relationships is the order that projects must follow, and this order cannot be changed casually. Based on the process network, considering the actual situation and conditions of the project construction site, including the actual amount of construction resources and specific construction organization methods, plus the corresponding organizational logic relationship, we can draw an implementable construction network. In the preparation stage of project construction, when designing the construction organization, we can only determine the logical relationship between construction processes and draw the process network diagram according to the established construction deployment and construction scheme. Because the process network generally only considers the process requirements, it is assumed that under the condition of unlimited resources, all the work technically allowed to be constructed at the same time is arranged according to equal operation, so the construction period is generally short. However, in fact, resources are always limited. In project construction, how to improve the utilization efficiency of resources and reduce the construction cost is to focus on practical problems when making plans and use plans to guide construction.
I believe that after the above introduction, everyone has a certain understanding of the four elements of project management and construction schedule control. Welcome to Zhong Da for more information.
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