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🔨 World Construction Engineering
Latest updates, tips, and tutorials on building, civil engineering, and construction in World.
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👉What is a Water-Tight Structure?

💫A water-tight structure is a construction element or system designed to prevent water penetration and resist leakage even under hydrostatic pressure.

⏺These are essential in places where structures are in contact with water (like basements, tanks, tunnels, or swimming pools) or below ground level where groundwater pressure is high.

🚧In simple terms:

A water-tight structure keeps water out (external waterproofing) or keeps water in (internal waterproofing), ensuring durability and functionality.


🏗️ Key Features

⏺Dense, low-permeability concrete or masonry
⏺Proper joint sealing (construction & expansion joints)
⏺Use of waterproof membranes or coatings
⏺Adequate reinforcement to control cracks
⏺Good drainage systems to reduce water pressure

🔑 Main Types of Water-Tight Structures

⏺Water-tight structures can be classified based on their function and method of water resistance:

🚧1. Water-Retaining Structures

⏺These hold or store water inside.
🎲Examples:Water tanks & reservoirs,Swimming pools,Dams,Overhead tanks

🚧2. Water-Excluding Structures

⏺These prevent water from entering.
🎲Examples:Basements,Underground car parks,Retaining walls,Tunnels,Lift pits

🔍 Practical Examples
Underground Basement

⏺Waterproofed with membranes + drainage
⏺Swimming Pool,Integral waterproof concrete + epoxy coating
⏺Tunnel,Segmental lining with water stops
⏺Reservoir or Dam, Crystalline admixtures + surface coatings

🛠️ Best Practices

❇️Proper mix design: low water-cement ratio
❇️Quality workmanship: good compaction & curing

🎲Crack control through reinforcement design and Regular inspection and maintenance of seals.

@etconp
❤6👏4👍1
ታምራት  ፕሌት እና ጄቦልት አቅራቢ

📌ፕሌትና ጄቦልት በፈለጉት አይነት የተዘጋጀ አለን

📍ኢትዮጵያ ዉስጥ የትም እንልክሎታለን


0904040477
0994941708
❤2
👉Different Types of HCB or Brick Bonds

🚧Stretcher Bond:-

    • Characterized by bricks laid lengthwise in a continuous pattern.

    • Each course overlaps the one below it by half the length of a brick.

    • A simple and cost-effective method commonly used for walls.

🚧Header Bond:-

    • Features bricks laid with their ends facing outward.

    • Used for constructing walls that are one brick thick.

    • Often employed for decorative purposes or to add structural strength.

🚧Flemish Bond:-

    • Alternates between stretchers and headers in each course.

    • Creates a visually appealing pattern with a mix of brick orientations.

    • Known for its aesthetic appeal and structural integrity.

🚧English Bond:-

    - Combines alternating courses of stretchers and headers.

    • Provides excellent strength and durability due to the interlocking pattern.

    • A traditional and widely used bonding technique.

🚧Stack Bond:-

    •  Bricks are stacked directly on top of each other without overlapping.

    • Results in a uniform, grid-like pattern.

    • Often used for decorative purposes or in modern architectural designs.

🚧Facing Bond:-

    • Not a standard term in bricklaying; possibly referring to a specific aesthetic or application.

    • May relate to the appearance or orientation of bricks on the surface of a wall.

@etconp
❤10👏2
የ"Site Diary" ጥቅምና ይዘት
{The importance and Format of Site Diary}


📌በግንባታ ሂደት ውስጥ የምናገኛቸው የተለያየ ዓላማና ይዘት ያላቸው ሰነዶች አሉ። ለምሳሌ ያህል፦ የውል ሰነድ (contract document)፣ የሥራ ፍቃድ (Work Permit/order)፣ የግንባታ ፍቃድ (Building Permit)፣ የሥራ ምዘና መዝገብ (Checklists)፣ የዕለት ሥራ ማስታወሻ (Site Diary)፣ ንድፎች (Drawings) ... የመሳሰሉት ይገኙበታል።

በሀገራችን የውል ፈጻሚዎች (አሠሪ፣ ተቋራጭ እና አማካሪ) ግጭት ውስጥ ለመግባታቸው አንዱና ዋነኛው ምክንያት እነዚህ ሰነዶች በግንባታ ሥራ አለመሟላታቸው መሆኑን የተጠኑ ጥናቶችም ጠቁመዋል።

ከእነዚህ ውስጥ አንዱ የሆነውን የዕለት ሥራ ማስታወሻ (Site Diary) እንመለከታለን። ብዙ ጊዜ ስለዚህ ሰነድ ያለን ትኩረት ለዘብ ያለ ሆኖ የሚስተዋል ቢሆንም ብዙ የሥራ ተቋራጮች፣ አማካሪዎች እና አሠሪዎች ከስረውበታል።  

ክፍል አንድ  ዋና ዋና ጥቅሙ፦


1ኛ). የዕለት ተግባራትን መመዝገቢያ፡ ይህ የማስታወሻ ጥራዝ ወይም ሰነድ በየቀኑ በግንባታ ቦታው ላይ የተከናወኑ ሥራዎችን እንመዘግብበታለን። የተሰሩ ሥራዎችን፣ ግንባታው ያለበትን ደረጃ፣ በዕለቱ ያለውን የአየር ሁኔታ፣ ለግንባታ ሥራው የተሳተፉ ባለሙያዎችንና የጉልበት ሰራተኞችን ብዛት፣ የገጠሙ ችግሮችን፣ የተወሰዱ መፍትሔዎችን፣ በባለድርሻ አካላት የታዘዙ ልዩ ትእዛዞች (ካሉ) እነዚህ መረጃዎች የምንመዘግብበት የሁሉም የግንባታ ስራዎች አጠቃላይ ዕለታዊ መዝገብ ሆኖ ያገለግላል። ይህ ሰነድ የፕሮጀክቱን እድገት ለመከታተል ወሳኝ ሲሆን በዕለት ተዕለት እንቅስቃሴው ውስጥ ግልፅነትን ያረጋግጣል፣ የፕሮጀክት አስተዳዳሪዎች እና ባለድርሻ አካላት ስለቦታው ሁኔታ እንዲያውቁ ያግዛል።

2ኛ). ቅሬታ ወይም የክርክር የሚፈታበት ነው፦  በግንባታ ፕሮጀክቶች ውስጥ መጓተትን፣ የአቅም ለውጥን ወይም የሥራ ጥራትን በተመለከተ አለመግባባቶች ሊፈጠሩ ይችላሉ። በመሆኑም የዕለት ክስተት ማስታወሻው ሰነድ በቦታው ላይ ስለ ሁነቶች እና ሁኔታዎች ማስረጃ የሚያቀርብ ህጋዊ የግንባታ ሰነድ ሆኖ የሚቆጠር ስለሆነ በየትኛውም የፍትህ መንገድ ቅቡልነት አለው። ለምሳሌ ያህል፦ የጊዜ መጓተት የሚፈጥሩ ክስተቶች ካሉ (ለአብነት) ቀኑን ሙሉ ዝናብ ቢውል ወይም አካባቢው ረብሻ ቢሆን እነዚህ ክስተቶች የወሰዱትን ጊዜ (ሰዓት፣ ቀን፣ ወር) በቁጥር የምናሰላው ከ'Site Diary ላይ ለቅመን ስለሆነ ክስተቶቹ ባስተጓጎሉት የጊዜ መጠን ልክ በውሉ ላይ የነበረውን ግንባታ የሚጠናቀቅበትን ጊዜ ለማራዘም ያግዛል። በሌላም በኩል (ለምሳሌ) የግንባታ ግብአት ማቅረብ የአሠሪው (Client/employer) ድርሻ ቢሆን እና የግንባታ ጊዜ በዚህ የተነሳ ቢጓተትበት ሥራ ተቋራጩ የጊዜ ማራዘሚያ እና የሠራተኞች ያለሥራ የቆዩበትን ክፍያ አሠሪው እንዲከፍል ሊጠይቅበት የሚችለው በ'Site Diary ላይ በአግባቡ የተቀመጠ መዝገብ ካለ ነው።

3ኛ) ጥራትን ለመቆጣጠር ማረጋገጫ ይሆናል፦ site diary መያዝ የጥራት ቁጥጥር እርምጃዎችን እና ፍተሻዎችን ለመመዝገብ ያስችላል። ለምሳሌ፦ በዕለቱ የተሠራው ሥራ የፌሮ ብረት እና የአርማታ ሙሌት  ነው ብለን ብናስብ ለእያንዳንዱ ስትራክቸር የተጠቀምንው የፌሮ ብረት አይነትና ብዛት፣ የሲሚንቶ የአሸዋ እና የጠጠር ብዛት፣ የተከናወኑ የቤተሙከራ ሥራዎችና ውጤቶቻቸው እና የተስተዋሉ ያልተሟሉ ጉዳዮችን የምንመዘግብበት ስለሆነ የግንባታ ሥራ በዲዛይኑ መሰረት ዝቅተኛውን መስፈርት አሟልቶ እየተከናወነ ስለመሆኑና ስላለመሆኑ ጥራቱን እንድንቆጣጠር፣ የሚፈለገውን ደረጃና መስፈርት የሚያሟላ መሆኑን ለማረጋገጥ፣ ተጠያቂነትን ለማስፈን እና አጠቃላይ የፕሮጀክት ጥራትን ለማሻሻል ያግዛል።

ክፍል ሁለት፡ ይዘቱ ምን መምሰል አለበት


ይቀጥላል .....

@etconp
❤30👍9🎉1
👉Sieve Analysis

🔵 3ቱም የ ጠጠር አይነቶች ( ተለቅ ያለ የጠጠር ፣ መካከለኛ ጠጠር እና ትንሹ ጠጠር) በ ምን ያህል መጠን ተካቷል የሚል የምርመራ ሂደት ነው።

🖼️ ምስሉን ተመልከቱ የበለጠ ለመረዳት

⚪️ የ ምንጠቀመው መሳሪያ (apparatus)

ー የተለያየ መጠን ያለው ወንፊት ከ 4.75 ሚሊሜትር መዘርዘሪያ ወንፊት በጣም ትንሹ 100 ፒኮሜትር ድረስ

ー የክብደት መለኪያ
ー ብሩሽ እና ትሬይ

📝 ጠጠራማ ሲሆን ከ 4.75 ሚሊሜትር እስከ 80 ሚሊሜትር ወንፊት አያልፉም

⚙️ ሂደት

1️⃣. የተወሰነ መጠን ያለው ጠጠር ውሰዱ ክብደቱን ለኩ

2️⃣. በወንፊቱ ከ ትልቁ ጀምራችሁ ወደ ትንሹ ለ 15 ደቂቃ ሸክሽኩ ( ከላይኛው ወንፊት ወደታችኛው)

3️⃣. በየአንዳንዱ ወንፊት የተያዘውን ጠጠር መዝኑ

ー የተያዘው መጠን (%) = የተያዘውን ጠጠር ክብደት በ ጠቅላላ ክብደት ሲካፈል በ መቶ ስናባዛ

ー ያለፈው መጠን(%)= 100% - የተያዘ የጠጠር መጠን

@etconp
❤9👍8
A prismatic beam of length L and fixed at both ends carries a uniformly distributed load. The distance of points of contraflexure from either end is
Anonymous Quiz
18%
0.207L
42%
0.277L
17%
0.211L
23%
0.347L
❤8👏1🙏1
Your client delays payments, and your company is on the verge of bankruptcy.
A bank offers a loan of 50M ETB at 15% interest, but your profit margin on the project is only 8% of 200M = 16M ETB.
What is the MOST strategic choice?
Anonymous Quiz
23%
A) Take the loan and finish project
10%
B) Refuse loan and suspend works
57%
C) Negotiate with client for advance or faster payment terms
10%
D) Finance project from retained earnings at a loss
1❤7
A hydraulic excavator can load 2.5 m³ of soil per cycle. Each cycle takes 2.5 minutes. If the machine operates 7 hours per day, its theoretical productivity (m³/day) is:

A) 420 m³ B) 4200 m³ C) 700 m³ D) 1050 m³
Anonymous Quiz
64%
A) 420 m³
16%
B) 4200 m³
8%
C) 700 m³
12%
D) 1050 m³
❤7🔥1
A bulldozer was available 10 hours in a day. During that day, it worked 6 hours due to site congestion and had a breakdown of 1 hour. Its availability (%) and utilization (%) are:
Anonymous Quiz
39%
A) Availability 90%, Utilization 60%
29%
B) Availability 80%, Utilization 60%
19%
C) Availability 90%, Utilization 66.7%
12%
D) Availability 85%, Utilization 70%
❤10
A motor grader has the following performance for one week:

Total available hours: 50 Breakdown hours: 5 Operating hours: 40 Standard production rate: 100 m³/hr Actual production rate: 90 m³/hr Calculate OEE (%):
Anonymous Quiz
30%
A) 72%
33%
B) 68%
26%
C) 65%
12%
D) 70%
❤7
A contractor planned 1,000 m³ of concrete at 12,000 ETB/m³. Actual quantity placed was 1,100 m³ at an actual cost of 14,000 ETB/m³. What is the cost variance (CV)?
Anonymous Quiz
48%
A) -3,400,000 ETB
28%
B) -2,200,000 ETB
14%
C) -1,800,000 ETB
10%
D) -1,200,000 ETB
👍4👏3❤1
PRP pool = 60,000 ETB
Weights: Schedule = 40%, Quality = 30%, Safety = 30%
Performance: Schedule = 90%, Quality = 80%, Safety = 100% What is the PRP earned?
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20%
A) 53,000 ETB
42%
B) 54,000 ETB
25%
C) 52,000 ETB
12%
D) 55,000 ETB
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PRP scheme:

Base bonus = 20,000 ETB Early completion < 10% of planned duration → 25% bonus Early completion ≥ 10% → 40% bonus Planned duration = 12 months Project completed in 10 months What is the PRP earned?
Anonymous Quiz
21%
A) 22,500 ETB
31%
B) 25,000 ETB
40%
C) 28,000 ETB
8%
D) 30,000 ETB
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PRP pool = 60,000 ETB

Schedule 40%, Cost 30%, Safety 30% Performance: Schedule 95%, Cost 85%, Safety 70% Safety penalty = 10% deduction Calculate final PRP.
Anonymous Quiz
23%
A) 50,850 ETB
36%
B) 48,600 ETB
29%
C) 49,440 ETB
12%
D) 51,000 ETB
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The ratio of average shear stress to maximum
shear stress in a prismatic beam of rectangular
cross section is :
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43%
(a) 3/4
25%
(b) 4/3
14%
(c) 3/2
18%
(d) 2/3
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Two beams of same material have equal crosssectional area. If one beam has square crosssection and the other has circular cross section-
Anonymous Quiz
9%
(a) Both the beam will be equally strong
39%
(b) Circular section will be stronger
25%
(c) Square section will be stronger
28%
(d) Strength depends on loading condition
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