修建类(国外英文资料).docVIP

建筑类(国外英文资料) Abstract: in the theory of tree and futualism, the author points out the mistakes of broken loop in some books, and also points out the network diagram Two new approaches to key routes. Details how to use the broken loop properly. Keywords: network diagrams; Broken ring method; Critical path; To the tree; Empowerment figure The broken loop method, which is one of the methods used in network planning techniques to identify critical routes, is simple and intuitive. Yet there are some books In the case of the broken coil method, the argument is too simple and even error: this method starts from the beginning and is numbered from the beginning In the small order, step by step, we should start from the beginning of the node, and then step by step in order of the number from small to large. Or change from the end node to the small order of the nodes, because the general rule of the network diagram node number is the beginning point The node number is the smallest and the beginning node number is the largest. Mistake 2: set a node that has two or more arrows passing through. Remove one of the shorter arrows and break the shorter line. That is to break the circle of the two lines. For example, A and B in the arrow network picture 1 are shorter than B, so they remove A and leave the B. If the time in the arrow network figure 1 is 5 and B is still 4, you should get rid of B and leave A But the wrong number. Figure 1: the arrow line network We can do the following analysis of the arrow network figure 1, which is known as an arrow line network diagram, which is required to determine the network diagram The critical route, we know, is the longest line in the network chart. We can quickly turn it into a theory of the tree The key line is solved. The result is shown in figure 2. The key route, which is drawn from the tree figure 2, is: 1 If the time of A in the arrow network figure 1 is changed from 3 to 5, and the other invariant, the result of the critical path that