The calculation sequence of the single-code splice network plan is: earliest start time, earliest completion time → time interval → total time difference, free time difference → latest start time, latest completion time. That is, ESi, EFi→LAGi, j→TFi, FFi→LSi, LFi. The following takes the single-code overlapping network plan in Figure 1 as an example to illustrate its calculation method.
Figure 1 Single code number wiring network plan diagram
Calculation order:
Front→Back; ESi, EFi→LAGi, j→TFi, FFi→LSi, LFi.
(1) Calculate the earliest start time and earliest completion time of the work from left to right. See Figure 2 to Figure 4 for details.
Calculation of planning time parameters for single-code overlapping network
Figure 2 Calculation process (1)
Calculation of planning time parameters for single-code overlapping network
Figure 3 Calculation process (2)
Calculation of planning time parameters for single-code overlapping network
Figure 4 Calculation process (3)
Calculation of planning time parameters for single-code overlapping network
(2) Calculate the time interval between adjacent jobs, LAGi,j calculation formula with overlapping relationship:
Calculation of planning time parameters for single-code overlapping network
See Figure 5 and Figure 6 for specific calculations.
Calculation of planning time parameters for single-code overlapping network
Figure 5 Calculation process (4)
Calculation of planning time parameters for single-code overlapping network
Figure 6 Calculation process (5)
(3) Calculate the total time difference and free time difference of work. See Figure 7 and Figure 8 for specific calculations.
Figure 7 Calculation process (6)
Figure 8 Calculation process (7)
Calculation of planning time parameters for single-code overlapping network
(4) Calculate the latest start time and latest completion time of the work, and the calculation sequence is:
See Figure 9 for specific calculations.
Calculation of planning time parameters for single-code overlapping network
Figure 9 Calculation process (8)
(5) Determine the critical route of the network plan: The route with all time intervals on the line being 0 from beginning to end is the critical route (Figure 10).
Calculation of planning time parameters for single-code overlapping network
Figure 10 Calculation process (9)
reference
https://www.renrendoc.com/paper/163040647.html
https://www.jianshe99.com/jianli/jingyan/we1511258192.shtml
https://www.slideserve.com/errin/5685363