Ethio Construction Engineering
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๐Ÿ‘‰What Is Scaffolding in Building Construction?

๐Ÿ’ซScaffolding is a temporary structure made of steel, aluminum, or timber that is erected around or inside a building to provide safe access and working platforms for workers during construction, repair, or maintenance activities at height.

๐ŸšงPurpose of Scaffolding in Building Construction

โบ1. Safe Working Platform
Provides a stable platform for workers to stand, sit, or place tools and materials.
Reduces the risk of falls and accidents when working at height.

โบ2. Access to High Areas
Enables workers to reach elevated parts of a building such as walls, columns, beams, and ceilings.
Essential for multi-storey buildings.

โบ3. Support for Construction Activities
Scaffolding is used during:
Brick and block masonry
Plastering and rendering
Painting and finishing works
Installation of windows, cladding, and services
Repair and maintenance work

โบ4. Material Handling
Allows safe storage of light materials (bricks, tools, paint buckets) near the work area.
Improves work efficiency and reduces movement time.

โบ5. Worker Safety
Fitted with guardrails, toe boards, and platforms to prevent falling.
โ‡๏ธHelps comply with construction safety standards.

๐ŸทCommon Types of Scaffolding

โบSingle scaffolding โ€“ mainly for brickwork
โบDouble scaffolding โ€“ used in stone masonry
โบCantilever scaffolding โ€“ when ground support is not possible
โบSuspended scaffolding โ€“ for painting and faรงade work
โบMobile scaffolding โ€“ movable type for light works

โญ๏ธSimple Definition

Scaffolding is a temporary structure used in building construction to support workers and materials and to provide safe access to work at height.


@etconp
โค5๐Ÿ‘2๐Ÿ‘1๐Ÿ™1
๐Ÿ‘‰What is Formwork in Building Construction?

๐Ÿ’ซFormwork is a temporary or permanent mold used in construction to shape and support fresh concrete until it hardens and gains enough strength to support itself.

๐Ÿ”ฐIn simple words, formwork is the container into which concrete is poured to get the required shape, size, and position of structural elements.

๐ŸšงPurpose of Formwork in Building Construction

โบFormwork plays a very important role in concrete construction.

โญ๏ธIts main purposes are:

๐Ÿšง1. To Give Shape and Size

โบFormwork ensures concrete members like slabs, beams, columns, walls, and foundations are formed according to the design drawings.

๐Ÿšง2. To Support Fresh Concrete

โบFresh concrete is heavy and fluid. Formwork holds the concrete in place until it hardens and becomes strong enough.

๐Ÿšง3. To Maintain Alignment and Level

โบIt keeps structural elements straight, level, and properly aligned, avoiding deformation.

๐Ÿšง4. To Achieve Good Surface Finish

โบProper formwork provides a smooth and neat surface, reducing plastering and finishing work.

๐Ÿšง5. To Ensure Safety During Construction

โบStrong and well-fixed formwork prevents collapse, protecting workers and materials.

๐ŸทCommon Materials Used for Formwork

โบTimber/Wood โ€“ most common and easy to use
Plywood โ€“ smooth finish, reusable

โบSteel โ€“ strong, durable, reusable many times

โบAluminum โ€“ lightweight, fast construction

โบPlastic โ€“ reusable and water-resistant

๐Ÿ“Where Formwork Is Used

โบColumns
โบBeams
โบSlabs
โบFoundations
โบStaircases
โบShear walls

@etconp
โค6๐Ÿ‘3
๐Ÿ‘‰FIRST SAFETY

โšก๏ธThe first safety requirements on high-rise building construction are critical because work is done at great heights, with heavy materials, machinery, and many workers.

๐ŸšงThese safety measures must be in place before and during construction to prevent serious accidents.

๐Ÿ’ซ1. Site Safety Planning (Before Work Starts)
Prepare a Site Safety Plan (SSP)

โบConduct risk assessment for height work, lifting, fire, and electrical hazards
โบProvide safety induction training for all workers
โบDisplay safety signs, emergency contacts, and rules clearly on site

๐Ÿ’ซ2. Personal Protective Equipment (PPE) โ€“ Mandatory

๐ŸทEvery worker must wear:

โบSafety helmet (hard hat)
โบHigh-visibility vest
โบSafety boots (steel toe)
โบGloves
โบSafety goggles
โบFull body safety harness for work at height

๐Ÿ’ซ3. Fall Protection Systems (Most Important)

โบGuardrails at slab edges and openings
โบSafety nets below work areas
โบLifelines and anchor points
Covered floor openings
โบStrict rule: No work at height without fall protection

๐Ÿ’ซ4. Scaffolding & Formwork Safety

โบScaffolding must be designed, erected, and inspected by competent persons
โบStrong base and proper bracing
โบSafe access ladders and platforms
โบFormwork must be stable and checked before concreting

๐Ÿ’ซ5. Lifting & Crane Safety

โบOnly certified crane operators
โบRegular inspection of cranes, hoists, slings
โบNo lifting over workers
โบClear communication using signals or radios

๐Ÿ’ซ6. Electrical Safety

โบProper grounding (earthing)
โบUse insulated cables and tools
โบTemporary power systems well protected
โบNo damaged wires or exposed connections

๐Ÿ’ซ7. Fire Safety & Emergency Preparedness

โบFire extinguishers on every floor
โบSafe storage of flammable materials
โบEmergency evacuation routes
โบFirst-aid kits and trained first-aiders
โบEmergency drills

๐Ÿ’ซ8. Housekeeping & Access Control

โบClean walkways and working areas
โบProper waste disposal
โบSecure site fencing
โบRestricted access for unauthorized persons

๐Ÿ’ซ9. Safety Supervision & Monitoring

๐ŸŽฒAppoint a Safety Officer

โบDaily safety inspections
โบToolbox meetings
โบImmediate correction of unsafe acts

๐Ÿ”‘ Key Rule:

Fall protection + PPE + supervision = life-saving combination in high-rise construction


@etconp
โค12๐Ÿ‘9๐Ÿ‘4๐ŸŽ‰1
๐Ÿ‘‰ INTERCON Construction Chemicals 

โ— Concrete Admixtures
โ— Bonding Agents
โ— Waterproofings
โ— Wall Putty, Prime Coat
โ— Concrete Repair Mortar
โ— Floor hardener, Epoxy
โ— Grout, Self-level mortar
โ— Quartz paint, Contextra
โ— Tile Adhesive & Tile Joint Fillers 
โ— Geotextiles and other construction chemicals and materials

โ˜Ž๏ธ Tel: 0961955555

๐Ÿ”น Address 1: Signal road, around
      Dinberwa Hospital

๐Ÿ”น Addres 2: Wellosefer, Infront of
     Dani Plaza
โค4๐Ÿ‘2
Ethio Construction Engineering
๐Ÿ‘‰Effective Length of a Column ๐Ÿ’ซEffective length (Le) of a column is the length between points of zero bending moment (contraflexure). It depends on the end support conditions, not only on the actual height. Formula: Le = K ร— L Where: L = actual unsupportedโ€ฆ
๐Ÿ‘‰Sections of Beam (Based on Reinforcement)

๐Ÿ’ซReinforced concrete beams are classified into Balanced, Under-Reinforced, and Over-Reinforced sections based on the amount of steel provided.

๐Ÿšง1) Balanced Section

โ–ถ๏ธA balanced section is one in which both concrete and steel reach their permissible stresses at the same time.

โ€ข Concrete reaches its maximum compressive strain
โ€ข Steel just reaches its yield stress
โ€ข Neutral axis depth = critical depth

โ–ถ๏ธFailure nature:

โ€ข Sudden and brittle

๐Ÿ“œRemarks:

โ€ข Ideal theoretical condition
โ€ข Rarely used in practice due to lack of warning before failure

๐Ÿšง2) Under-Reinforced Section

โ–ถ๏ธAn under-reinforced section has less steel than required for a balanced section.

โ€ข Steel yields first before concrete crushes
โ€ข Neutral axis depth < critical depth

๐Ÿ“œFailure nature:

โ€ข Ductile failure
โ€ข Large deflection and visible cracks before failure

๐ŸŽฒAdvantages:

โ€ข Gives sufficient warning before collapse
โ€ข Safe and preferred in design

๐Ÿ”ฐUsed in practice:

โ€ข YES (most commonly used in RCC design)

๐Ÿšง3) Over-Reinforced Section

โ–ถ๏ธAn over-reinforced section has more steel than required for a balanced section.

โ€ข Concrete crushes before steel yields
โ€ข Neutral axis depth > critical depth

๐Ÿ“œFailure nature:

โ€ข Brittle failure
โ€ข Sudden collapse without warning

๐ŸŽฒDisadvantages:

โ€ข Unsafe
โ€ข Not recommended in RCC design

๐Ÿ”ฐUsed in practice:

โ€ข NO (avoided by design codes)

๐Ÿ“Comparison Summary

โ‡๏ธBalanced section:

โ€ข Steel and concrete fail together
โ€ข Brittle failure

โ‡๏ธUnder-reinforced section:

โ€ข Steel fails first
โ€ข Ductile and safe

โ‡๏ธOver-reinforced section:

โ€ข Concrete fails first
โ€ข Brittle and unsafe

@etconp
โค7
๐Ÿ‘‰Design Requirements for Solid Slab Design (Building Construction)

๐ŸšงA solid slab is a reinforced concrete slab that transfers loads directly to beams, walls, or columns.

๐Ÿ’ซTo ensure safety, serviceability, and economy, the following requirements must be satisfied.

๐Ÿท1. Applicable Design Codes

โบDesign must comply with recognized standards, for example:
EBCS
ACI 318 (USA)
Eurocode 2 (EN 1992)
BS 8110
IS 456
Local building codes (as applicable)

๐Ÿท2. Span & Support Conditions

๐Ÿ“Identify whether the slab is one-way or two-way:

โ–ถ๏ธOne-way slab: Longer span / shorter span โ‰ฅ 2
โ–ถ๏ธTwo-way slab: Longer span / shorter span < 2

โบDefine support type: simply supported, continuous, or cantilever.

๐Ÿท3. Loads to Be Considered

โบAll relevant loads must be included:
โ‡๏ธDead load: Self-weight of slab + floor finishes
โ‡๏ธLive load: Occupancy load (residential, office, storage, etc.)
โ‡๏ธPartition wall load (if any)
Environmental loads: seismic and wind (indirect effect on slabs)
โ‡๏ธApply load combinations as per the code.

๐Ÿท4. Slab Thickness (Depth)

โบMinimum thickness to control deflection:

โบSimply supported slab:
h โ‰ฅ L / 20
๐ŸŽฒContinuous slab:
h โ‰ฅ L / 26
โบCantilever slab:
h โ‰ฅ L / 10
(L = effective span)
โบAlso check deflection limits according to code.

๐Ÿท5. Material Requirements

โบConcrete grade: Usually โ‰ฅ C25/30
โšก๏ธReinforcement steel:
โบYield strength (fy) = 415 MPa or 500 MPa
โบMaterials must meet durability and exposure conditions.

๐Ÿท6. Reinforcement Design
Main reinforcement: Along the direction of bending

โ‡๏ธDistribution reinforcement: Perpendicular to main bars
โ‡๏ธMinimum reinforcement:
Typically โ‰ฅ 0.12% of gross concrete area (for HYSD bars)
โ‡๏ธBar spacing:
โบMain bars โ‰ค 3d or 300 mm
โบDistribution bars โ‰ค 5d or 450 mm (d = effective depth)

๐Ÿท7. Bending Moment Check
Calculate design bending moments.

๐ŸšงEnsure: Mu โ‰ค ฯ†Mn (or equivalent safety format per code)

๐Ÿท8. Shear Check

โบSlab should resist one-way shear without shear reinforcement in most cases.

๐ŸšงEnsure:
Vu โ‰ค Vc
If Vu > Vc โ†’ increase slab thickness.

๐Ÿท9. Deflection Control

โบSatisfy span-to-depth ratios.
Long-term deflection (creep + shrinkage) must be within limits.

๐Ÿท10. Crack Control

โบLimit bar spacing and stress in steel.
โบProper curing is essential to minimize cracking.

๐Ÿท11. Cover to Reinforcement
Minimum clear cover (typical values):

โบInterior slab: 20โ€“25 mm
โบExposed or aggressive environment: 30โ€“40 mm

๐Ÿท12. Construction & Detailing Requirements

โบProper formwork alignment
Correct bar placement and spacing Adequate compaction (vibration)
โบMinimum curing period (7โ€“14 days)

๐Ÿท13. Serviceability & Durability

โบControl cracking and deflection Ensure fire resistance and long-term durability
โบConsider waterproofing for roofs and wet areas

@etconp
โค10๐Ÿ™9
แ‰ณแˆแˆซแ‰ต แ•แˆŒแ‰ต แŠฅแŠ“ แŒ„ แ‰ฆแˆแ‰ต แŠ แ‰…แˆซแ‰ข

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แŠ แ‹ตแˆซแˆปแฆ  แ‰ 1.แˆ˜แˆญแŠซแ‰ถ
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                 แ‰.3 แ‰„แˆซ

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โค4๐Ÿ‘2
๐Ÿ‘‰Design Requirements of Shear Walls according to EBCS (Ethiopian Building Code Standards)

๐Ÿšง1. Purpose of Shear Wall

๐Ÿ’ซShear walls are structural elements provided to:
โบResist lateral loads (earthquake & wind)
โบControl story drift
Increase stiffness and strength of buildings
โบImprove seismic performance, especially for mid- and high-rise buildings

๐Ÿšง2. Location & Layout Requirements

๐Ÿ’ซAccording to EBCS-8: Shear walls shall be:
โบContinuous from foundation to roof
โบUniformly distributed in plan to avoid torsion
โบPreferably placed:
At building cores (stairs, elevators)
โบSymmetrically in both X and Y directions
โบAvoid: Sudden termination of walls and Large offsets or irregular wall alignment

๐Ÿšง3. Thickness Requirements
As per EBCS-2:

๐Ÿ’ซMinimum wall thickness:
โบ150 mm for low-rise buildings
โบ200 mm or more for multi-storey buildings

โšก๏ธThickness must satisfy:Slenderness limits,Fire resistance,Durability requirements

๐Ÿšง4. Material Requirements
Concrete

โบMinimum concrete grade:
C25 (fck โ‰ฅ 25 MPa) for seismic areas
โบGood compaction and curing are mandatory

โšก๏ธReinforcement Steel
โบDeformed bars with:
fy = 300โ€“500 Mpa

๐Ÿšง5. Reinforcement Requirements (Very Important)

๐Ÿท5.1 Vertical Reinforcement
Minimum vertical steel ratio:
ฯv โ‰ฅ 0.0025 (0.25%)
Bars: Uniformly distributed
โบMinimum bar diameter: ร˜10 mm
โบSpacing: โ‰ค 300 mm

๐Ÿท5.2 Horizontal Reinforcement
โบMinimum horizontal steel ratio: ฯh โ‰ฅ 0.0025
โบSpacing: โ‰ค 300 mm

๐Ÿ“Purpose:
โบControl cracking
โบImprove ductility

๐Ÿšง6. Boundary Elements (Seismic Requirement)

โบAccording to EBCS-8: Boundary elements are mandatory when:

๐Ÿ”ฐWall is heavily stressed High axial force exists
๐ŸŽฒRequirements:

โบConfined reinforcement (ties/stirrups)
โบTie spacing: โ‰ค 100 mm near ends
โบBoundary zone width: โ‰ฅ max( wall thickness, 300 mm )

๐Ÿšง7. Openings in Shear Walls

๐Ÿ’ซOpenings (doors/windows) must:
โบBe limited in size
โบBe properly reinforced around edges
โบLintels and coupling beams:
Must be designed for shear + bending
โบRequire diagonal reinforcement in seismic zones

๐Ÿšง8. Seismic Design Provisions (EBCS-8)

๐Ÿ’ซShear walls must be designed for:
โบDesign base shear
โบOverstrength factor
โบDuctile detailing is compulsory:
โบProper anchorage
โบLap splices away from critical zones
โบDrift limits must be checked:
Inter-story drift โ‰ค allowable limit

๐Ÿšง9. Foundation Connection

๐Ÿ’ซShear walls must be:

โบRigidly connected to foundation
โบProper dowel bars and development length provided
โšก๏ธFoundation must resist:
โบOverturning
โบSliding

๐Ÿšง10. Construction & Quality Control

๐Ÿ’ซAccurate bar placement
Proper cover:

โบโ‰ฅ 25โ€“40 mm depending on exposure
โบContinuous supervision is required

๐Ÿ“œConclusion

๐Ÿ’ซAccording to EBCS, a shear wall must be:

โบProperly located
โบAdequately thick
โบCorrectly reinforced
โบDetailed for ductility and seismic resistance
โบFully integrated with foundation and slabs

@etconp
โค12๐Ÿ‘Œ3
๐Ÿ‘‰แˆŒแˆ‹แŠ›แ‹ แ‰ปแŠ“แˆ‹แ‰ฝแŠ• แ‰ฐแ‰€แˆ‹แ‰…แˆˆแ‹‹แˆ?

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๐ŸŒŸแŠ แ‹ณแ‹ฒแˆต แ‹จแˆตแˆซ แ‰…แŒฅแˆฎแ‰ฝ แŠฅแŠ“ แ‹จแŠฎแŠ•แˆตแ‰ตแˆซแŠญแˆฝแŠ• แŒจแˆจแ‰ณแ‹Žแ‰ฝ แˆฒแ‹ˆแŒก แ‰ แ‰€แˆ‹แˆ‰แŠ“ แ‰  แ‰ตแŠฉแˆฑ แˆˆแˆ˜แˆ˜แˆแŠจแ‰ต แŠจแ‰ณแ‰ฝ แ‰ฃแˆˆแ‹ แˆŠแŠ•แŠซแ‰ฝแŠ• แ‹ญแ‰€แˆ‹แ‰€แˆ‰แŠ•แข

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https://t.me/ETCONpWORK
โค4๐Ÿ™2
๐Ÿ‘‰Diagonal Reinforcement Bar in Open-Down Building Structures

๐Ÿ’ซDiagonal reinforcement bars are steel bars placed at an inclined (diagonal) angle in structural elements.

๐ŸšงIn open-down structures (such as buildings with open ground floors, soft storey, large openings, or stilt parking), these bars are very important for stability and earthquake resistance.

โ‡๏ธWhat is an Open-Down Structure?

โบAn open-down (soft storey) building has: Open ground floor (parking, shops, halls)
Fewer walls or columns at the lower level Reduced stiffness compared to upper floors
This makes the structure vulnerable to lateral loads (earthquake & wind).

๐Ÿ“Purpose of Diagonal Reinforcement Bars

โบDiagonal bars are mainly used to: Resist shear forces
Prevent diagonal cracking due to lateral loads
โบImprove seismic performance:-Act like a bracing system during earthquakes
โบControl cracking:-Especially around openings (doors, windows, soft storey)
โบIncrease ductility:-Helps structure deform safely without sudden failure

๐ŸทWhere Diagonal Bars Are Commonly Used

โบShear walls Masonry walls (around openings)
โบSoft storey / open ground floor
โบBeam-column joints Infill walls for seismic zones

๐ŸทHow They Work (Simple Explanation)

โšก๏ธWhen an earthquake pushes a building sideways:
โบOne diagonal bar works in tension
โบThe opposite diagonal resists compression
โบThis action distributes forces safely to the foundation

๐Ÿ”ฐTypical Arrangement

โบPlaced at 45ยฐโ€“60ยฐ angle
Anchored properly into beams, columns, or boundary elements
โบUsed in X-shape or single diagonal pattern
โบAccording to Codes (General) Required in seismic design codes (EBCS, IS, Eurocode, ACI)
โบMandatory for soft storey mitigation
โบBar diameter and spacing depend on structural design

๐Ÿ“œSimple Summary

Diagonal reinforcement bars strengthen open-down buildings by resisting shear, improving earthquake safety, and preventing sudden collapse.


@etconp
๐Ÿ‘7โค5
๐Ÿ‘‰ INTERCON Construction Chemicals 

โ— Concrete Admixtures
โ— Bonding Agents
โ— Waterproofings
โ— Wall Putty, Prime Coat
โ— Concrete Repair Mortar
โ— Floor hardener, Epoxy
โ— Grout, Self-level mortar
โ— Quartz paint, Contextra
โ— Tile Adhesive & Tile Joint Fillers 
โ— Geotextiles and other construction chemicals and materials

โ˜Ž๏ธ Tel: 0961955555

๐Ÿ”น Address 1: Signal road, around
      Dinberwa Hospital

๐Ÿ”น Addres 2: Wellosefer, Infront of
     Dani Plaza
โค6
๐Ÿ‘‰Foundation masonry work

๐Ÿ’ซit is masonry construction (stone, brick, or block) built below or just above ground level as part of the building foundation system.

๐ŸšงIts main purpose is to safely transfer building loads to the soil and protect the structure.

โญ๏ธPurpose of Foundation Masonry Work

๐ŸŽฒ1. Load Transfer to Soil

โบFoundation masonry:
Receives loads from columns, walls, and beams Distributes these loads evenly to the footing and soil This prevents uneven settlement and structural cracks.

๐ŸŽฒ2. Raises Structure Above Ground Level

โบMasonry foundation walls or plinth walls: Lift the superstructure above natural ground Protect the building from surface water, moisture, and flooding

๐ŸŽฒ3. Protection Against Moisture & Soil Contact

โบFoundation masonry:Acts as a barrier between soil and upper structure Reduces dampness, termites, and soil chemicals from affecting walls
Often combined with DPC (Damp Proof Course) at plinth level.

๐ŸŽฒ4. Provides a Level & Strong Base

โบIt creates: A firm, level base for RCC columns or load-bearing walls
โบProper alignment and stability for the superstructure

๐ŸŽฒ5. Improves Durability & Strength

โบStone or block masonry foundations: Are durable and economical
โบResist compression forces very well
โบExtend the buildingโ€™s service life

๐ŸŽฒ6. Cost Efficiency (Especially Low-rise Buildings)

โบFor: Low-rise buildings Load-bearing structures
Masonry foundations are often cheaper than full RCC foundations.

๐ŸทCommon Types of Foundation Masonry

โ‡๏ธStone masonry foundation
โ‡๏ธBrick masonry foundation
โ‡๏ธBlock masonry foundation

๐Ÿ“œSummary

๐Ÿ“Foundation masonry work is essential to:

โบTransfer loads safely
โบProtect against moisture and soil effects
โบProvide a strong, durable, and level base
โบImprove structural safety and building life

@etconp
โค10๐Ÿ‘5๐Ÿ‘1๐Ÿ™1
๐Ÿ‘‰CALCULATION โ€“ Field Density Test (FDT)

๐Ÿ“œExample

โš–๏ธ Weight of sand used

= Weight of sand + cylinder before test โˆ’ Weight of sand + cylinder after test
= 8373 โˆ’ 2524
= 5849 g

๐Ÿ•ณ๏ธ Weight of sand in hole

= Weight of sand used โˆ’ Weight of sand in cone
= 5849 โˆ’ 1610
= 4239 g

๐Ÿ“ฆ Volume of hole

= Weight of sand in hole รท Bulk density of sand
= 4239 รท 1.344
= 3154 cc

๐Ÿชจ Weight of soil passing 19 mm sieve

= Weight of wet material โˆ’ Weight retained on 19 mm sieve
= 7263 โˆ’ 1350
= 5913 g

โš™๏ธ Bulk density of soil

= Weight of soil รท Volume of hole
= 5913 รท 3154
= 1.875 g/cc

๐Ÿ’ง Moisture content (Speedy Moisture Tester)

= 7.8 %

๐Ÿ“Š Field dry density

= Bulk density รท (1 + Moisture content รท 100)
= 1.875 รท (1 + 7.8 รท 100)
= 1.875 รท 1.078
= 1.74 g/cc

๐Ÿ“ˆ Percentage of compaction

= Field dry density รท Laboratory MDD ร— 100
= 1.74 รท 2.144 ร— 100
= 96.3 %

โœ… RESULT

๐Ÿ“Œ Field Dry Density = 1.74 g/cc
๐Ÿ“Œ Laboratory MDD = 2.144 g/cc
๐Ÿ“Œ Compaction Achieved = 96.3 %


๐ŸซตFor More Subscribe๐Ÿ‘‡

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@etconp
๐Ÿ‘11โค8๐Ÿ‘1
๐Ÿ‘‰แ‰ แŒจแˆจแ‰ณ แˆ‚แ‹ฐแ‰ต แ‹แˆตแŒฅ แŠ แŠ•แ‹ต แ‰ฅแ‰ป แ‰ฐแŒซแˆซแ‰ฝ แŠจแ‰ฐแˆณแ‰ฐแˆ แŠ แˆธแŠ“แŠ แˆ›แ‹ตแˆจแŒ แ‹ญแ‰ปแˆ‹แˆ?

โœ…แŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‰ฅแ‰ป แŠจแˆ†แА แŠ แˆธแŠ“แŠ แˆ›แ‹ตแˆจแŒ แ‰ แˆ…แŒ แˆŠแ‰ปแˆ แ‹ญแ‰ฝแˆ‹แˆแฃ
โœ… แАแŒˆแˆญ แŒแŠ• แ‹ญแˆ… แ‹จแˆšแŠจแŠ“แ‹ˆแАแ‹ แ‹จแŒจแˆจแ‰ณ แˆ‚แ‹ฐแ‰ฑ แ‰ แˆ™แˆ‰ แ‰ แŒแˆแŒฝแАแ‰ต แŠฅแŠ“ แ‰ แˆ…แŒ แˆ˜แˆ แˆจแ‰ต แŠจแ‰ฐแŠซแˆ„แ‹ฐ แŠฅแŠ“ แ‹จแ‰€แˆจแ‰ แ‹ แ‹จแ‹‹แŒ‹ แˆตแˆŒแ‰ต
     โžฃแ‰ฐแˆ˜แˆซแŒญแฃ
     โžฃแ‰ฅแ‰ แŠฅแŠ“
      โžฃแ‰ แ‰ฐแŒˆแ‰ขแ‹ แ‹จแŒˆแ‰ แ‹ซ แ‹‹แŒ‹ แŠญแˆแˆ แ‹แˆตแŒฅ แŠจแˆ†แА แ‰ฅแ‰ป แАแ‹แข

โญ๏ธแ‹ญแˆ…แŠ•แŠ• แˆˆแˆ˜แˆจแ‹ณแ‰ต แ‹จแˆšแŠจแ‰ฐแˆ‰แ‰ตแŠ• แАแŒฅแ‰ฆแ‰ฝ แˆ›แˆตแ‰ฐแ‹‹แˆ แŠ แˆตแˆแˆ‹แŒŠ แАแ‹แก

๐Ÿ“1. แ‹จแŒจแˆจแ‰ณแ‹ แˆ…แŒ‹แ‹Š แŠฅแŠ“ แˆฅแˆญแ‹“แ‰ณแ‹Š แˆ˜แˆ แˆจแ‰ต

โบแ‹จแˆ›แŠ•แŠ›แ‹แˆ แŒจแˆจแ‰ณ แ‹‹แŠ“ แ‹“แˆ‹แˆ› แ‰ฐแŒซแˆ›แˆช แ‹แ‹ตแ‹ตแˆญแŠ• แˆ›แˆแŒฃแ‰ต แŠฅแŠ“ แˆˆแŒแˆแŒˆแˆ› แ‰ฅแ‰ แ‹จแˆ†แŠ‘ แ‰ฅแ‹™ แ‰ฐแŒซแˆซแ‰พแ‰ฝแŠ• แˆ›แˆฐแ‰ฃแˆฐแ‰ฅ แАแ‹แข
โบ "แ‹จแˆ›แ‹ญแˆ˜แˆˆแŠจแ‰ณแ‰ธแ‹ แŒจแˆจแ‰ณแ‹Žแ‰ฝ" แ‹ˆแ‹ญแˆ "แˆ™แˆ‰ แ‰ แˆ™แˆ‰ แ‹ซแˆแ‰ฐแˆณแŠฉ แŒจแˆจแ‰ณแ‹Žแ‰ฝ" แ‰ แ‰ฅแ‹™ แ‹จแŒแ‹ฅ แˆตแˆญแ‹“แ‰ถแ‰ฝ แ‹แˆตแŒฅ แŠฅแŠ•แ‹ฐ แŠ แŠ•แ‹ต แŒ‰แ‹ณแ‹ญ แ‰ฐแ‹ฐแˆญแŒŽ แ‹ญแ‰†แŒ แˆซแˆแข แŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‰ฅแ‰ป แˆ˜แŠ–แˆฉ แ‹ญแˆ…แŠ•แŠ• แˆแŠ”แ‰ณ แ‹ซแˆตแŠจแ‰ตแˆ‹แˆแข

๐Ÿ“2. แŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‰ฅแ‰ป แˆฒแŠ–แˆญ แ‹จแŒจแˆจแ‰ณแ‹แŠ• แˆ‚แ‹ฐแ‰ต แˆˆแˆ˜แ‰€แŒ แˆ แ‹จแˆšแŠจแ‰ฐแˆ‰แ‰ต แˆ˜แˆŸแˆ‹แ‰ต แŠ แˆˆแ‰ฃแ‰ธแ‹แก-

โ‡๏ธแ‹จแŒจแˆจแ‰ณแ‹ แˆ›แˆตแ‰ณแ‹ˆแ‰‚แ‹ซ (Bid Invitation) แ‰ แ‰‚ แŒŠแ‹œ แŠฅแŠ“ แ‰ แ‰ฐแŒˆแ‰ขแ‹ แˆ˜แŠ•แŒˆแ‹ต แˆ˜แ‹ˆแŒฃแ‰ฑแก
โ‡๏ธแŒจแˆจแ‰ณแ‹ แ‰ แˆ•แ‹แ‰ฅ แ‰ฐแ‹ฐแˆซแˆฝ แ‹จแˆ†แŠ‘ แˆ˜แŒˆแŠ“แŠ›แ‹Žแ‰ฝ (แˆ›แˆˆแ‰ตแˆ แŒ‹แ‹œแŒฆแ‰ฝแฃ แ‹ตแˆจแŒˆแŒพแ‰ฝ) แˆ‹แ‹ญ แ‰ แ‰ฐแŒˆแ‰ขแ‹ แŒŠแ‹œ แŠฅแŠ•แ‹ฐแ‰ฐแˆˆแŒ แˆ แˆ›แˆจแŒ‹แŒˆแŒฅ แŠ แˆˆแ‰ แ‰ตแข
โ‡๏ธแ‹ญแˆ… แˆˆแˆแˆ‰แˆ แŠ แˆ˜แ‰บ แ‹จแˆ†แŠ‘ แ‰ฐแŒซแˆซแ‰พแ‰ฝ แ‹จแˆ˜แˆณแ‰ฐแ แŠฅแ‹ตแˆ แŠฅแŠ•แ‹ณแˆ‹แ‰ธแ‹ แˆˆแˆ›แˆจแŒ‹แŒˆแŒฅ แАแ‹แข
โ‡๏ธแ‹จแŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‹‹แŒ‹ แˆตแˆŒแ‰ต (Bid) แ‰ฐแˆ˜แˆซแŒญ แŠฅแŠ“ แŠขแŠฎแŠ–แˆšแ‹ซแ‹Š แˆ˜แˆ†แŠ‘แก แ‹จแ‰€แˆจแ‰ แ‹ แ‹‹แŒ‹ แ‰ แŒจแˆจแ‰ณแ‹ แˆฐแАแ‹ต แ‹แˆตแŒฅ แ‰ แ‰ฐแŒˆแˆˆแŒธแ‹ แ‰ แŒ€แ‰ต แ‹ˆแ‹ญแˆ แ‰ แŒˆแ‰ แ‹ซ แ‹‹แŒ‹ แˆ›แˆˆแ‰ต แ‹ญแ‰ปแˆ‹แˆ แ‰ แˆšแŒˆแˆ˜แ‰ต แ‹จแ‹‹แŒ‹ แŠญแˆแˆ แ‹แˆตแŒฅ แˆ˜แˆ†แŠ• แŠ แˆˆแ‰ แ‰ตแข

๐Ÿ”ฐแŠจแˆ˜แŒ แŠ• แ‰ แˆ‹แ‹ญ แŠจแ แ‹ซแˆˆ แ‹‹แŒ‹ แˆ˜แŒ แ‹จแ‰… แ‰ฝแŒแˆญ แˆŠแˆแŒฅแˆญ แ‹ญแ‰ฝแˆ‹แˆแข
๐Ÿ”ฐแ‹จแ‰ฐแŒซแˆซแ‰น แ‹จแ‰ฅแ‰ƒแ‰ต แˆ›แˆจแŒ‹แŒˆแŒซ (Responsiveness and Responsibility)แก แŠ แŠ•แ‹ต แ‰ฅแ‰ แ‰ฐแŒซแˆซแ‰ฝ แˆ˜แˆ†แŠ‘แŠ• แˆ›แˆˆแ‰ตแˆ แˆแˆ‰แŠ•แˆ แ‹จแŒจแˆจแ‰ณ แˆ˜แˆตแˆแˆญแ‰ถแ‰ฝ แŠฅแŠ•แ‹ฐแˆšแ‹ซแˆŸแˆ‹ แŠฅแŠ“ แˆฅแˆซแ‹แŠ• แˆˆแˆ›แŠจแŠ“แ‹ˆแŠ• แ‹จแˆšแ‹ซแˆตแˆแˆแŒˆแ‹แŠ• แ‰ดแŠญแŠ’แŠซแˆแฃ แ‹แ‹ญแŠ“แŠ•แˆปแˆ แŠฅแŠ“ แˆ…แŒ‹แ‹Š แŠ แ‰…แˆ แŠฅแŠ•แ‹ณแˆˆแ‹ แˆ›แˆจแŒ‹แŒˆแŒฅ แŠ แˆˆแ‰ แ‰ตแข
๐Ÿ”ฐแ‹จแŒแ‹ขแ‹ แŠฎแˆšแ‰ด/แŠ แŠซแˆ แ‹แˆณแŠ”แก แ‰ แˆ˜แŒจแˆจแˆป แˆ‹แ‹ญแฃ แŒจแˆจแ‰ณแ‹แŠ• แ‹จแˆšแ‹ซแˆตแ‰ฐแ‹ณแ‹ตแˆจแ‹ แŠฎแˆšแ‰ด แ‹ˆแ‹ญแˆ แŠ แŠซแˆ แŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‰ฅแ‰ป แˆ†แŠ– แ‹จแ‰€แˆจแ‰ แ‹แŠ• แ‹จแ‹‹แŒ‹ แˆตแˆŒแ‰ต แ‹จแˆ˜แ‰€แ‰ แˆ แ‹ˆแ‹ญแˆ แ‹จแˆ˜แŒแ‰ฃแ‰ฃแ‰ต แ‹แˆณแŠ” แˆ›แˆณแˆˆแŒฅ แŠ แˆˆแ‰ แ‰ตแข
๐Ÿ”ฐแ‹ญแˆ… แ‹แˆณแŠ” แ‰ฅแ‹™แ‹แŠ• แŒŠแ‹œ แŠจแˆ‹แ‹ญ แŠจแ‰ฐแŒ แ‰€แˆฑแ‰ต แˆ˜แˆตแˆแˆญแ‰ถแ‰ฝ แŒ‹แˆญ แ‰ แˆ›แŒˆแŠ“แŠ˜แ‰ต แ‹ญแ‹ˆแˆฐแ‹ณแˆแข

๐Ÿ“3. แ‹จแˆšแŠจแ‰ฐแˆ‰แ‰ต แˆแŠ”แ‰ณแ‹Žแ‰ฝ แˆŠแŠ–แˆฉ แ‹ญแ‰ฝแˆ‹แˆ‰

โบแŒจแˆจแ‰ณแ‹ แˆ˜แ‹แŒ‹แ‰ต แŠฅแŠ“ แŠฅแŠ•แ‹ฐแŒˆแŠ“ แˆ˜แ‰…แˆจแ‰ฅแก แ‹จแŒแ‹ขแ‹ แŠ แŠซแˆ แŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‰ฅแ‰ป แˆตแˆ‹แˆˆ แ‹ˆแ‹ญแˆ แ‹จแ‰€แˆจแ‰ แ‹ แ‹‹แŒ‹ แŠจแˆ˜แŒ แŠ• แ‰ แˆ‹แ‹ญ แŠจแ แ‰ฅแˆŽ แˆตแˆ‹แŒˆแŠ˜ แŒจแˆจแ‰ณแ‹แŠ• แˆ™แˆ‰ แ‰ แˆ™แˆ‰ แŠฅแŠ•แ‹ฐแˆ›แ‹ญแˆ˜แˆˆแŠจแ‰ต แˆŠแ‹ˆแˆตแŠ• แ‹ญแ‰ฝแˆ‹แˆแข
โบแ‰ แ‹šแˆ… แˆแŠ”แ‰ณ แŒจแˆจแ‰ณแ‹ แ‹ญแ‰ณแŒ แแŠ“  แŠฅแŠ“ แŠฅแŠ•แ‹ฐแŒˆแŠ“ แ‰ แ‰ฐแˆปแˆˆ แˆ›แˆตแ‰ฐแ‹‹แ‹ˆแ‰‚แ‹ซ แŠฅแŠ“ แ‰ แˆ›แˆณแˆฐแ‰ขแ‹ซ แˆŠแ‰€แˆญแ‰ฅ แ‹ญแ‰ฝแˆ‹แˆแข
โบแŠจแŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แŒ‹แˆญ แ‰ แ‰€แŒฅแ‰ณ แ‹ตแˆญแ‹ตแˆญ (Direct Negotiation)แก แ‰ แŠ แŠ•แ‹ณแŠ•แ‹ต แˆตแˆญแ‹“แ‰ถแ‰ฝแฃ แŠ แŠ•แ‹ต แ‰ฐแŒซแˆซแ‰ฝ แ‰ฅแ‰ป แŠจแ‰€แˆจแ‰  แ‰ แŠ‹แˆ‹แฃ แ‹จแŒแ‹ขแ‹ แŠ แŠซแˆ แŠจแ‹šแ‹ซ แ‰ฐแŒซแˆซแ‰ฝ แŒ‹แˆญ แ‰ แ‰€แŒฅแ‰ณ แˆˆแˆ˜แ‹ตแˆญแˆต แ‹แˆณแŠ” แˆŠแˆฐแŒฅ แ‹ญแ‰ฝแˆ‹แˆแข
โบแ‹ญแˆ… แˆ‚แ‹ฐแ‰ต แŒแŠ• แ‰ แŒฃแˆ แŒฅแ‰ฅแ‰… แ‹จแˆ†แŠ‘ แˆ…แŒŽแ‰ฝ แ‹แˆตแŒฅ แАแ‹ แŠฅแŠ“ แ‰ แŒแˆแŒฝแАแ‰ต แˆ˜แˆ แˆจแ‰ต แˆ˜แŠจแŠ“แ‹ˆแŠ• แŠ แˆˆแ‰ แ‰ตแข

๐Ÿทแˆˆแˆตแˆซ แ‰…แŒฅแˆญ แŠฅแŠ“ แŒจแˆจแ‰ณแ‹Žแ‰ฝ๐Ÿ‘‡

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@etconp
โค8๐Ÿ‘Œ1
3084. When the two columns are so close to each other that their individual footing would overlap then which type of footing is provided?
Anonymous Quiz
18%
(a) Strap Footing
69%
(b) Combined footing
11%
(c) Raft Footing
1%
(d) Grillage Footing
โค8๐Ÿ‘1
3083. The method used for studying of horizontal changes in the sub-soil is
Anonymous Quiz
20%
(a) Resistive soundings
27%
(b) Resistive mapping
21%
(c) Mean resistivity
31%
(d) Critical distance
๐Ÿ‘4โค1
3080. How is the fineness of cement measured?
Anonymous Quiz
22%
(a) Volume/Mass
55%
(b) Mass/Volume
14%
(c) Mass/Area
9%
(d) Area/Mass
โค5๐Ÿ™3
3074. S etting time of cement decrease by reducing
Anonymous Quiz
35%
(a) gypsum
28%
(b) calcium chloride
26%
(c) hydrogen peroxide
11%
(d) sodium oxide
๐Ÿ‘5