⚡ባለፈው ፅሁፋችን ስለ ዊር (Weir) ፅፈን ነበር ብዙ ሰዎችም ስለ ዊር (Weir) እና ባሬጅ (barrage) ልዩነት ጠይቃችሁናል።
⏩ምላሹም እንሆ ... @engineer03
*እስኪ ቀለል ባለ አማርኛ የዊር (Weir) እና ባሬጅ (Barrage)
ልዩነታቸው ምንድነው ለሚለው መልስ ልስጥ።
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⏩ [ ዊር - Weir ]
ዊር በወንዝ ወይም በውሃ መሄጃ ሸለቆ የሚገነባ የሃይድራውሊክ
መዋቅር ሲሆን ውሃን በማገድ በላይኛው ተፋሰስ (upstream)
በኩል የውሃውን ቁመት/መጠን በሚፈለገው ልክ እንዲሆን
የሚያስችል መዋቅር ነው። ከተፈለገው መጠን በላይ የተከማቸ ውሃ በዊሩ አናት ላይ (crest level) ፈሶ እንዲያልፍ
የሚያስችለውን የመዋቅር አይነት እና ጉልበት እንዲኖረው ሆኖ
ይገነባል። ዊር የሚገነባው ዝፍቀት (immersion) በሚከሰትበት
የወንዝ ወይም የውሃ መውረጃ ላይ ነው።
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⏩[ባሬጅ - Barrage]
በመቆጣጠሪያ (manual or automatic) ልንቆጣጠራቸው
የምንችላቸው የውሃ ማለፍያ በሮች በዊራችን ላይ የምንገነባ
ከሆነ ይህ መዋቅር Barrage በመባል ይጠራል። ከዊር በተለየ
በባሬጅ ግዜ የውሃ መጠኑን የምንቆጣጠረው የውሃ ማለፍያ
በሮችን በመክፈትና በመዝጋት ነው እነዚህ በሮች በተለያየ ደረጃ /
ከፍታ ይገነባሉ። በባሬጅ ግዜ ከመጠን ያለፈ ውሃ በበሮቹ
ይወገዳል እንጂ በዊሩ አናት ላይ (Overflow) አያልፍም።
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🚩 የምትሰጡን አስተያየት ሆነ ማበረታቻ ብርታት ይሆነናል!
ምስጋናችን ከልብ ነው።


https://telegram.me/engineer03

♦WATERPROOFING MEMBRANES(ውሀን የማያዘልቅ ሽፋን)

A waterproofing membrane is a thin layer of water-tight material that is laid over a surface. This layer is continuous and does not allow water to pass through it. For example, on a flat terrace, a waterproofing membrane could be laid above the structural slab and below the finish tiles. This will ensure that water does not seep into the structural slab. The tiles and membrane must be laid over a filler material that is sloped to ensure that water flows into sumps and drains. Any water that remains as puddles over the tiles is likely to seep into the slab over time, so puddles are to be avoided at all costs.

These membranes are composed of thin layers of waterproof material. Most are about 2 to 4mm thick. There are essentially 2 types of membranes,
1. sheet based membranes and
2. liquid applied membranes.

A. sheet based membranes

As the name implies, these are membranes that arrive at the site in the form of rolls. These are then unfurled and laid on a firm surface. The most common type of sheet based membrane is a bituminous waterproofing membrane. This type of membrane is stuck to the substrate with a hot tar based adhesive using blowtorches. 


Joints between adjacent membranes are also made with the same hot adhesive. The sheets are overlapped by about 100mm (4") to form a waterproof joint. Some membranes are even joined by melting them with a hot air gun and then overlapping them on the previously laid sheet.

With this type of membrane, joints between sheets are critical, and must be done perfectly to avoid leakage.


B. liquid applied waterproofing membranes

Liquid applied membranes come to the site in liquid form, which are then either sprayed or brush-applied on the surface. The liquid cures in the air to form a seamless, joint-free membrane. The thickness can be controlled by applying more of the liquid chemical per unit area.

Since the application procedure is very quick, a contractor will try and finish the entire area to be waterproofed in a single day to avoid cold joints. However, if a very large area is to be done on successive days, cold joints can easily be done by overlapping the new membrane over the old - the chemical will stick to itself readily.


These are generally considered to be superior to sheet based membranes as they are joint-free. However care must be taken in application to provide just the right thickness. The membrane can tear or break if it is too thin. The adhesion of the membrane to concrete must be good.

If a concrete screed (layer) is to be applied over a waterproofing membrane, the membrane is made rough by sand broadcasting. This is throwing a thin layer of sand by hand over the wet membrane (before it has set fully) so that the sand sticks to the membrane and provides a rough surface the concrete can adhere to.

# how to select a waterproofing membrane?? ( ምን ላይ ተመርኩዘን ውሀ የማያዘልቅ ሽፋንን እንምረጥ?)

Check for the following properties of the membrane:

♥UV Stability - if the membrane is to be exposed to the sun, than it must be UV stable or UV resistant, else it will degrade over time.

♥ Elongation - this is the ability of the membrane to stretch. It is measured in percentages. An elongation of 150% means that the membrane can stretch to 1.5 times its length when pulled. Elongation is a must in buildings that will move, such as high-rise buildings, or buildings made with steel, which is flexible. This property will allow the membrane to stretch over cracks that may develop in the future. Membranes with elongation properties of over 200% are available.

♥ Breathability - one disadvantage of good waterproofing is that if water does happen to enter into the structure from a point and spread across a surface, that water is trapped inside the structure, and cannot get out. Breathable membranes help to release that water to the air in the form of water vapor. So some membranes are designed to prevent water from passing through them, while at the same time allowing water vapor to pass through. So over time, breathable membranes allow trap

ped water to evaporate into the atomosphere.

♥ Tear Resistance - this is an important property, as many membranes that have good elongation also can tear easily. Take a small sample of the material in your hand, and try and tear it into two pieces. This gives a fair idea of its tear resistance. You are looking for a membrane that will not tear even if a reasonable force is exerted on it.

♥Abrasion Resistance - this is the ability of a membrane to withstand wear and tear. As most membranes are covered concrete screeds and tiling, the abrasion resistance comes into play during the construction period, when workers are walking on the surface, dropping nails and screws, and scraping hard objects like rebar against the membrane, which can damage it. A very soft membrane with low abrasion resistance may get damaged in such a situation, which can cause it to leak.

♥Chemical stability - check that the membrane is chemically inert with respect to its environment in the building. Some membranes, especially outside basement walls, are exposed to the soil and rainwater outside.

♥ Food Safety - membranes can be applied to the inside of concrete water tanks to make them waterproof. In this case, the membrane must be food safe, as the water is in contact with the membrane.

♥ Geometry - if a membrane has to be installed over a complicated shape, such as the junction of a column and beam, then a liquid applied membrane is preferable, as it can be applied to any type of underlying shape or structure. A sheet membrane would form folds and creases and leave gaps between the underlay and membrane.

where are membranes used?( እነዚን ሽፋኖች የት ነው ምንጠቀማቸው?)

# Membranes can be used in the following parts of a building:

♣ over terrace slabs and balconies

♣ in toilets

♣ underneath and around basements

♣ in concrete water tanks (use a food safe membrane)

♣ in swimming pool

♣ over landscaped concrete decks, between the soil and concrete

♣ ​in gutters

For more updates join the channel by using this link
http://t.me/engineer03

⏩ስለ Take off sheet ኣዘገጃጀት @engineer03
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👉In taking off paper we have four column which have own their property.
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🏠ኮለመን 1..
⚡ይህ ኮለመን ታይምሲንግ ይባላል ጥቅሙም ተመሳሳይ የሆኑ ስራዎች ላለመደጋገም ማባዣ ፋክተር ሁኖ ባንዴ ለመስራት ያገለግላል።
⏩it used for the number of times an item occurs is called TIMISING COLUMN.
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🏠ኮለመን 2..
⚡ይህ ደሞ ዳይሜንሽን ሲባል ማለትም ቁመት ጎን እና ርቀት የምናሰፍርበት ኮለመን ነው::
⏩it used to inter the dimensions of the items of works and the dimension is entered in the order of :length,width,height or thickness and column 2 is called DIMENSION COLUMN.
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🏠ኮለመን 3..
⚡ይህ ደሞ ኮለመን 2 ያሉ ዳሜንሽኖቹ በማባዛት ከነ ዩኒቱ የምናሰፍርበት ኮለመን ነው
⏩it is stated dimension in column 2 are multiplied to determine the quantity of the works and it called SQUARING COLUMN.
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🏠ኮለመን 4..
⚡ይህ የ ገለፃ ኮለመን ደሞ ጥቅሙ ጠለቅ ባለ እና ግልፅ በሆነ መልኩ የምንገልፅበት ኮለመን ነው
⏩ it used to briefly description of the work item and it is called DESCRIPTION COLUMN
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ለሁሉም እንዲዳረስ ፖስቶቹን SHARE አድርጉልን።
👇👇👇👇👇
Join for more updates via the link below;
t.me/engineer03
👆👆👆👆👆

👉የኮንስትራክሽን ውል @engineersWorks...
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⚡በቁፋሮ ወቅት ሳይት ላይ ሊገኙ ስለሚችሉ አንዳንድ ነገሮች
ኮንስትራክሽን ኮንትራት ውል ምን ይላል???
⏩ ለምሳሌ: ወርቅ ወይም ሌላ መዐድን (ክምችቱ አነስተኛ የሆነ… ) ቢገኝ👆👆👆

👉Helmet Color Code @engineer03
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➡በኮንስትራክሽን ሳይት ላይ የሰራተኛ ደህንነት(safety) ቅድሚያ የሚወሰድጉዳይ ነው።
ደህንነት መጠበቂያ አንዱ እና ዋነኛው በራስ ላይ የሚደረግ ቆብ
(Helmet) ይገኝበታል።
⏩የደህንነት መከላከያ ቆብ (Helmet) እንደየ የስራ ድርሻ እና
ሀላፊነታችን በቀለም ይከፋፈላል።
እያንዳነዱን ሰው በስራ ሀላፊነት ለመለየት ይጠቅማል።👇
***
⏩Helmet Color Code
*
▶White: Managers, Engineers, Supervisors and
Foremen
*
▶Blue: Electricians, Carpenters and other technical operators apart from civil workers
*
▶Green: Safety Officers
*
▶Red: Fire Fighters
*
▶Yellow: Laborers
*
▶ Brown: Welders and workers with high heat
application
*
▶Grey: Site Visitors
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⚡ለሁሉም እንዲዳረስ ፖስቶቹን SHARE አድርጉልን።

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03

#share for your beloved one

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03

✅Tip👉 @engineer03