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BIM

BIM

HOME BIM BIM Based Quantity Take-Off
  • Structural Work
    about 110 projects
    13,100,000㎡ (3,237ac)
    about 88,000 unit
  • Finish Work
    about 30 projects
    3,500,000㎡ (864.8ac)
    about 23,500 unit

BIM Based Quantity Take-Off?

A series of 3D-based modeling task with the design books to perform quotation through accurate quantity calculation, in this process, it is possible to 1) check drawing error, 2) calculate 3D-based quantity, and 3) calculate optimum construction cost compared to 2D quantity calculation, as a result,
there is an effect of cost reduction through reducing the error of settlement quantity compared to execution and improving design and construction quality

2D vs. 3D (BIM) Quantity Calculation & Quotation Comparison

Drawing review and accurate quantity calculation is available by performing 3D (BIM)-based quantity calculation and quotation task, and it also is applicable efficiently to construction ability review

  • 2D-based
    Incorrect Quantity Calculation (Many Errors)
    Difficulty in Check & Verification
    Excessive Design & Quantity Calculation
    Significant variations exist among companies subcontracting supplies and conducting quantity take-offs through other companies
    → Difficulty in verification (Calculation Formula)
  • 3D (BIM) Based
    Accurate Quantity Calculation (Minimum Errors)
    Simplified & Validation (Visual)
    Excessive Design & Quantity Calculation Minimization
    Simplified & verification in case of subcontracting supplies and quotations through companies
    Effective Constructability & Design Review

Part Classification (Structural Work, Finish Work)

Structural Work Finish Work

Process

Expected Effects

  • Contract Quantity vs Settlement Quantity Comparison
    Comparative Review Available Through
    Accurate Quantity Calculation
  • Pre-Construction Ability &
    Drawing Errors Review
    Accurate Review Available Through
    BIM Models Establishment
  • Productivity Improvement
    Establish the BIM model that enables
    fast decision making
  • Quantity Change
    History Management
    Easy Design Change History
    Management
  • Easy Design Change
    Response
    Design Changes Time Reduction & Easy
    Response to changes compared to
    conventional 2D tasks
  • Actual Quantity Reduction compared to site execution
    Entire Quantity Reduction compared to
    conventional 2D calculation
    (Ex: Approximately 6-7% Reduction for rebar)

Subsidiary Materials Automatic Extraction & Modeling Automation

Automatic Framework Quantity (Concrete, Cast, Rebar) Calculation considering joint and continuity of rebar fixing

  • Rebar Template Reflection Support
  • Setting Function Support for general structural items such as fixing and joint length criteria
  • Quantity Calculation reflecting customer's standard information and know-how

Drawing Errors Review – Architecture Cross-Sectional Diagram and Structural List

  • ① Indoor gymnasium border beam in Building Construction Cross-Sectional Diagram, but not in Floor Plan
  • ② Depth of the beam in Building Construction Cross-Sectional Diagram (2600) and the list (900) is different

Real-time Quantity Information Utilization By Construction Area

  • Quantity & Information Management Support According to Construction Area (By Construction District and Floor)

BIM based Modeling Characteristics

External

  • Scope: The facade of the building, which is divided into the main building external / auxiliary facilities external / underground parking lot external
  • Characteristics : Characteristics of buildings by project and various exterior finishing materials are reflected in modeling

Unit

  • Scope: Architectural representation including dry wall and masonry wall, and finishing representation of interior components including washboard, material separator and curtain box
  • Characteristic: As the quantity calculation using one type modeling requires about 40% maximum of the total households, accuracy and precision are required
    Proceeded in order of Extended Household → Base Household → Heterogeneous Household (Approximately 8 to 15 per type)

Subsidiary/Neighborhood Living

  • Scope: Subsidiary facilities required for apartment housing, which consists of community facility, management office, sky lounge and daycare center
  • Characteristics: As it has independent characteristics by facility and room, the modeling is required considering it, and detailed modeling is required as it includes amorphous curtain wall and interior elements

Underground

  • Scope: Space accessing into underground, which is largely divided into underground parking lot & mechanical and electrical room
  • Characteristic: Modeling task should be performed considering the interworking with buildings, such as main building, subsidiary and neighborhood living

Public Space

  • Scope: Core portion connecting different parts and floors, which is largely divided into ELEV hall, stairways, and entry hall
  • Characteristic: More precise modeling should be performed in order to reflect the facility space and the finish of each floor. Especially, modeling of the entrance hole (underground, 1st ground floor) is the most important.