August 18, 2023
In some relatively single small and medium low current projects, drawings are developed by ourselves, or for small projects there are no drawings at all, and construction can begin after communication on spot. However, in case of medium and large projects, projects that we receive through bidding or other channels will have initial drawings developed by design institute. When we receive blueprints, first thing we need to do is study drawings and understand them, which requires us to learn how to read drawings. Today I will share with you how to understand drawings.
System diagrams, conventions and contents
Mid-sized and large projects usually use not one subsystem, but a complex system consisting of dozens or dozens of subsystems. If you don't understand blueprints, you don't know where construction starts, which will result in wasted a lot of labor.
Directory listing: subsystem
List of drawings, print size
When we get a blueprint, we must first separate subsystems in blueprint to find out how many subsystems there are. Be sure to read legend on drawing clearly. If you cannot remember it, you can print it out for comparison, since drawings produced by each design institute and icons on legend do not exactly match. similar, there are still some differences.
The designations of drawing, usually in different design institutes will be different
Description of drawing symbols
Description of scope of drawing project
Then, we need to understand design requirements of entire low-current system, carefully study system design description, and understand design goals and functions to be fulfilled in entire system, which will help us understand design. logic of whole drawing is faster and better.
Description of subsystem design function
Details of system architecture diagram
When we understand this basic content, we can see architectural layout of entire system. The system architecture is most important part of entire blueprint. Whether design of overall system architecture is reasonable and how feasible it is related to ultimate success or failure of entire project. When looking at an architecture diagram, you should use your own professional knowledge to analyze whether an architecture diagram is feasible. Is there a better solution. Don't think that drawings issued by design institutes have to be correct, many drawings issued by design institutes have problems. The designers of design institute are not professionals in low-voltage industry. With dozens of subsystems, mistakes are inevitable. When we look at drawings, we need not only to understand drawings, but also to find hidden problems based on understanding. Most medium to large low current systems go through a secondary recess design prior to construction.
System architecture overview
While reviewing drawings, we should note doubts and errors and raise our issues in communication meeting with Party A to correct second deepening of project.
Subsystem Design Plan
Having understood structure of drawings, we can look at diagrams of molecular system and look at drawings of subsystems one by one to figure out structure of each subsystem and content of each subsystem.
Finally, if there is a problem with drawing, contact Party A for further deepening and gradual revision until final draft. Of course, after final revision of sketch, only part of drawing work is completed. Because we still need to calculate main materials and auxiliary materials needed for each sub-system, draw up a list of main materials and auxiliary materials, consult specific product price, and arrange procurement matters according to construction time node.
In short, on medium to large-scale, low-profile projects, reviewing drawings, deepening design, and finally drafting design specification is a relatively cumbersome process. But for medium and large projects, every link is important. Thus, it is difficult for individual users to single-handedly assemble such a medium to large low current system.
After receiving blueprints, some people rush to organize people to visit construction site regardless of situation, study blueprints during construction, modify and redo during construction, and finally find that workers are reluctant to do so. didn't know how to do it and it ended up being a mess.
After many projects, I found that many workers could not understand blueprints. Essentially, local management staff posted topics where they said. Therefore, on-site management personnel should be familiar with drawings at an early stage. This is end of today's article and I will be sharing it with you step by step in future.
