1, 2, 3 and 4 levels of progress definition and division:
1) Level 1 schedule
A. The first-level schedule, that is, the overall project schedule and the overall network plan, is the overall time frame schedule to guide the project work. It takes the project specialty as the object, reflects the project design, procurement, construction, debugging and the total project duration, and is the most intuitive and basic embodiment to meet the project schedule objectives. Organized by the control department, assisted by the construction department, design department, purchasing department and production preparation department. , approved by the project manager and submitted to the company for approval.
B the first-level schedule mainly involves the contents of control points: site preparation (demolition, "seven connections and one leveling", etc. ), bidding, software package cycle, overall design cycle, basic design cycle \ detailed design cycle, procurement cycle (inquiry \ ordering and delivery date of key equipment such as long-term equipment and patented equipment), site handover, pile foundation engineering, civil engineering, civil engineering safety, installation and construction of various disciplines, and overall progress plan of long-term projects shall be in Gantt chart format supplemented by text descriptions, and the overall network plan of the project should be in network diagram.
2) Secondary progress plan
A. The secondary progress is the total progress with equipment as the object, and it is a connecting link. On the one hand, it is a supplement to the first-level project plan, on the other hand, it has a guiding role in the preparation of the third-level project plan. Mainly detailed design, procurement, construction professional management and specific interface coordination management, to ensure compliance with the requirements of the first-level schedule control points, and to establish more detailed control points.
B the secondary progress plan mainly involves the contents of control points: basic design cycle, basic design review, EPC award, detailed design cycle of each discipline, design cycle of key equipment, procurement cycle and length of each discipline, periodic equipment procurement, civil construction cycle, construction cycle of each installation discipline and delivery date. The secondary progress plan is compiled by P3 or project software.
3) Three-level progress
A. Three-level progress plan is a detailed implementation plan of equipment, which is used to establish progress detection benchmark and track detection. The three-level schedule is broken down into sub-items, which are subdivided into the number of equipment items, piping system and electrical instrument categories.
B. The three-level schedule mainly involves the contents of control points: arrival information of professional construction drawings, arrival information of equipment and materials, approval information of construction scheme, installation time of platform civil foundation, vertical start-up and completion time, installation time of platform equipment, installation time of pipelines or systems, installation time of electrical instruments by division or classification, and construction time of anti-corrosion and heat preservation. The three-level schedule should reflect the logical and restrictive relationship between activities, and indicate the key routes and preparation instructions. Generally compiled with special software.
4) Four-level progress plan
A. The four-level progress plan is decomposed into subdivisional works by the construction contractor, refined to the process level, and updated weekly.
B, the four-level schedule mainly includes control points: civil piling, pile inspection, pile cutting, slotting, cushion, steel binding, formwork support, pouring, acceptance, equipment assembly welding, hoisting, pressure testing, internal parts installation, pipeline prefabrication installation, purging and pressure testing, electrical instrument cable laying, installation and debugging, etc.
C. The schedule shall indicate the start time, construction period, completion time and handover time of each subdivisional work and each working procedure.
reference data
Spread by sea and spread by sea [reference time 20 17- 12-24]