Progress control is a dynamic management process, including

The purpose of progress control: to achieve project progress goals through control

The most basic project management principle: control the progress of the project while ensuring quality

The task of the owner's progress control: control the progress of the entire project implementation phase

Designer

Progress control tasks of the construction party: Control the construction progress according to the construction progress requirements of the construction task entrustment contract

Supplier progress control

Summary: The task of progress control is to control the progress according to the progress requirements of the contract (except the owner)

A system consisting of multiple interrelated schedules

Establishment and improvement is a process, it is gradually improved

Each project participant can prepare multiple different project schedule planning systems (each for each)

project implementation stage, The overall project progress goals include

The overall progress target refers to the progress target of the entire project, which is determined during the project definition during the project decision-making stage.

The control of the overall progress target is the project management task of the owner Note: If the general engineering contracting model is adopted, the control of the overall progress target is also a task of the project management of the general engineering contractor.

Before controlling the overall progress target, the possibility of achieving the target should first be analyzed and demonstrated. Note: The overall progress target demonstration is not the preparation of the overall progress plan. It involves the analysis of project implementation conditions and project implementation planning.

The core work of large-scale project overall goal demonstration is to demonstrate the possibility of achieving the overall progress goal by preparing a general progress outline. The overall progress outline includes:

Research and collect information

Project structure analysis

Structural Analysis of Schedule Planning System

structural analysis (Total first, points later)

Project work code

Prepare progress plans for each level

Coordinate the relationship between progress plans at all levels and prepare the overall progress plan

schedule (Divide first and then total)

If the prepared overall progress plan does not meet the progress target, try to adjust it

If adjustments are made multiple times and the project progress cannot be achieved, report to the project decision maker

The simplest and most widely used traditional planning method

The header is often used as work and a brief description, and the project progress is expressed on the timetable. Note: A brief description of the work can also be placed directly on the bar graph. One line can accommodate multiple tasks, but simplicity will be lost.

Work can be sorted by time, responsibility, project objects and similar resources

The horizontal bar chart is more intuitive and easy to understand the planning diagram, but it has the following problems:

A network diagram that represents work with arrows and the numbers of nodes at both ends.

Arrow lines: 1. Each arrow line represents a piece of work (the dotted arrow line represents imaginary work) 2. The name of the job is marked above the arrow, and the duration required to complete the work is marked below the arrow. 3. In order to correctly express the logical relationship between tasks, it is often necessary to use dotted arrow lines. It has three functions: connection, differentiation and circuit breaking. 4. It can be a straight line, a polyline or a diagonal line, and the direction of travel is from left to right. 5. The work that is arranged immediately before this work is called the immediate work, and the work that is arranged immediately after is called the immediate work.

Node: including starting node, end node and intermediate node A job has only one arrow line and a corresponding pair of nodes, and the tail node number is required to be smaller than the arrow node number; the node numbers should be from small to large, and can be discontinuous, but no repetitions are allowed.

Line: The path from the starting node to the ending node is called a line. ①Can be described by node code ②The length of the line: the sum of all working hours ③A network diagram may have many lines Among each line, one or several lines have the longest total time and are called critical lines.

The established logical relationship must be expressed correctly

Circulation loops are strictly prohibited

Bidirectional arrows or links without arrows are prohibited.

Arrow lines without arrow nodes or nock nodes are strictly prohibited.

When nodes have redundant outward and inward arrows, the bus method can be used to draw them.

Arrow lines should not cross. When crossing is unavoidable, the bridge method or pointing method can be used.

There is only one start node and one end node, and the others are intermediate nodes.

Earliest start time ES = the maximum value of the earliest completion time of each predecessor task

Earliest finish time EF = earliest start time duration

Take the largest from front to back

Latest completion time LF = the minimum value of the latest start time of each subsequent task

Latest start time LS = latest finish time - duration

Take the smallest from back to front

Total time difference: The maneuver time that can be used for this work without affecting the total construction period

latest-earliest (LS-ES or LF-EF)

Total time difference TF=LS-ES=LF-EF (latest-earliest)

total time difference

Free time difference FF: The maneuver time that can be used for this work without affecting the earliest start time of the subsequent work.

Free time difference FF = earliest start time of subsequent work (minimum value) - earliest completion time of this work

Free time difference

A network plan prepared based on time coordinates. The solid arrow line represents work, the dotted arrow line represents virtual work, and the wavy line represents work free time difference.

Features: (1) It has the advantages of a network plan and a horizontal bar graph and can clearly indicate the time progress. (2) It can directly display the start and completion time of each job (earliest), Free time difference and key routes (3) The resource requirements per unit time can be counted (4) Modification of the network plan is more troublesome (due to time coordinates)

General provisions

critical line

Total time difference calculation

Preparation method

Work is represented by nodes and their numbers, and arrows represent the logical relationships between jobs. The work code, project name and duration are added to the nodes.

basic concept

Features

drawing rules

Calculation of six time parameters

Finish-to-start time: FTSi-j represents the time distance between the completion time of the predecessor job i and the start of the successor job j

Finish-to-completion time FTFi-j: represents the time distance between the completion time of the predecessor task i and the completion time of the successor task j

Start-to-start distance STSi-j: represents the time distance between the start time of the predecessor job i and the start time of the successor job j

Start-to-start distance STFi-j: represents the time distance between the start time of the predecessor job i and the completion time of the successor job j

Key work: The work with the smallest total time difference TF. When the planned duration is equal to the calculated duration, the total time difference is 0.

Schedule compression

critical line

On the original time scale network plan, starting from the time point of the plan inspection from top to bottom, dotted lines are used to connect the forward points of the actual progress of each work in sequence to form a polyline.

Determine the deviation between actual progress and planned progress

Determine the impact of actual progress on the total construction period and follow-up work

Contents of network plan adjustments

How to adjust key lines