This is one post title I have always wanted to put up on on my blogs but never got around to actually doing it: the pictures of related civil and structural works that beginning electrical and mechanical people must know .. engineers or not.
Picture 01 – A backhoe excavating an cable trench
This will also be an anchor post. I will just upload additional pictures here with minimal comments.
If there is a particular point that I wish to explain in length, I will send a separate article with related pictures and diagrams. Then I will link it back to here.
If the point can be put across simply, I will just elaborate a bit here without sending a separate post. Not yet at least.
Picture 01 above shows a backhoe doing an excavation of a cable trench. This picture is from one of my old project.
From the small size and shallow depth of the cable trench, this would have been for a compound lighting.
Earth excavations, whether for underground cables, manholes, electrical earthing systems, are activities of civil work by nature.
However, a lot of external electrical installation involve civil work activities.
Therefore, like it or not, these related civil works are part of the skills and knowledge beginning electrical engineers need to learn.
xxxxx Related Articles: Pictures of other related building services xxxxx
Picture 02 – A backhoe backfilling 33kV manhole pit
This picture shows another backhoe backfilling the hollow gap in the pit around around a manhole after it has been properly placed and aligned.
Picture 03 – Another cable trench excavation
This excavation is for incoming underground 11kV cabling to a new project. Here a set of underground 6 inch diameter ducts would be laid together with cable draw pits (e.g. the manholes).
Later, the electricity supply authority would pull their cables through these ducts to connect to their substation inside the new building.
Picture 04 – Mobile crane unloading a pre-cast manhole from a transport truck
This activity may not precisely be called a civil work activity. However, it is a common daily activity on a construction site.
Transformers, electrical switchgears and other major electrical equipment are unloaded at project site in a similar way.
Picture 05 – A tower crane at a multi-storey building under construction
When a building under construction is more than a few storey high, a fixed lifting crane is normally installed to facilitate the lifting activities and movement of materials from one location to another at the construction site.
The building under construction in the picture will be 11 storey high above ground when completed, plus another three levels of below-ground floors for parking.
Picture 06 – The tower crane lifting a construction materials
The length of the tower crane’s lifting arm in Picture 05 above is 50 meters. Picture 06 above show the end of the lifting arm.
If the moving lifting hoist is at the end of the arm, this crane is able to lift a maximum load of 1500 kg or 1.5 ton.
Of course if it is not at the farthest end, it is capable of lift a heavier load.
Knowing simple rules of thumb like this is important for electrical engineers supervising installation works at site because it immediately gives her an idea whether a mobile crane need to be arranged when organizing the delivery of a major electrical equipment such as a diesel-power standby electrical generator.
Picture 07 – Exhaust ducts under structural beams
The picture above shows a few major element of building’s structural components that always interacts with the mechanical and electrical services.
I will touch lightly on only one at the moment: the structural concrete beam.
Please note the labels that I added to the photograph and the thick red lines that connect the components that each label refer to.
The structural beams of a building always give troubles to our electrical and mechanical services. Or rather our mechanical and electrical services always give problems to the structural team of designers at the design office and the construction teams at the project site.
THat is because this component of a building structure consistently needs to be coordinated with the M&E (mechanical and electrical) designs.
If sufficient coordination at the design stage is not carried out between the design teams of these different disciplines, then there is a high chance that problems will crop up during the construction and installation stage.
Diagram 08 – An example of coordinated cross-section of a typical floor
This is an example of typical cross-sections for a building floor.
I added lebels in RED for the benefit of beginners so they can understand these basic components quickly.
This diagram is not for the location photographed in Picture 07 earlier.
However it from the same project and and for the same building.
The picture was taken in basement level 2, while the cross-section is for a location in level 5 of the office tower.
I intend to send a post or two to cover important coordination concepts as demonstrated in Picture 07 and Diagram 08 above. But it may take take a while more because I plan to finish uploading all my anchor posts first before going into real articles.
Anchor posts helps me upload simple contents (eg. uploading pictures, diagrams, etc) faster and easily because I do not have to write much to make the content valuable to a wide range of people.
Okey, folks. I will see you again soon.
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