Searching, Retrieval, and Knowledge Management of Construction Documents. Jack C.P. Cheng

Size: px

Start display at page:

Download "Searching, Retrieval, and Knowledge Management of Construction Documents. Jack C.P. Cheng"

Robert Peters
5 years ago
Views:

1 Searching, Retrieval, and Knowledge Management of Construction Documents Jack C.P. Cheng

2 In each construction project, large amount of documents are generated, which include drawings, change orders, and invoices. Stakeholders sometimes do not know which document version is the latest. Our goals: To facilitate the searching of documents To relate the documents to each other To extract useful knowledge from the documents. Searching, retrieval and knowledge management of construction documents Jack C.P. Cheng, HKUST

3 Searching, retrieval and knowledge management of construction documents Jack C.P. Cheng, HKUST

4 Document Codification Timestamp Keywords/tags Doc type Author Version Features Work Items (WBS) Product Items (PBS) ID Doc Type AP Approvals CO Change orders DR Drawings IV Invoice LE Letters Etc. Etc. For textual documents Text mining techniques Domain-specific dictionaries / taxonomy (e.g. OmniClass) Product Breakdown Structure Project Building Component Work Breakdown Structure Project Phase Task Searching, retrieval and knowledge management of construction documents Jack C.P. Cheng, HKUST

Search by Timestamp Keywords/tags Doc type For textual

Keywords Keywords Features Tags Tags Work Items (WBS)

Relatedness Score Text mining techniques Searching,

5 Search by Timestamp Keywords/tags Doc type For textual documents Doc 1 Doc 2 Author Doc type Doc type Version Keywords Keywords Features Tags Tags Work Items (WBS) Product Items (PBS) Related documents Similarity / Relatedness Score Text mining techniques Searching, retrieval and knowledge management of construction documents Jack C.P. Cheng, HKUST

6 Allows retrieval of similar documents across different projects for reference Maintain a history of each document, so as to ensure the latest version is being used Knowledge discovery from the document features In the future: Designated stakeholders are notified automatically upon changes on a particular document Semi automated classification of documents based on their extracted features Searching, retrieval and knowledge management of construction documents Jack C.P. Cheng, HKUST

7 Construction Waste Management

8 Background Hong Kong has been suffering from huge amounts of various kinds of construction wastes, with an average daily generation of 42,184 tons as of Some construction wastes are disposed of at landfills and most in public filling areas. It is predicted that Hong Kong will run out of existing landfill areas soon. It is difficult to find additional landfill spaces for urban wastes, as indicated in the recent exceptional executive-legislature conflict associated with the extension of the Tseung Kwan O landfill. It is urgently necessary to develop an efficient waste management system for sustainable urban development in Hong Kong.

9 Construction Waste Disposal Methods Mainly used in HK

10 Construction Material Flow Model Consumable Material Non-Consumable Material Construction Process Reuse in Project Leftover Building Structure Return/Resell Storage Waste Reuse Recycle Recover Landfill

11 Construction Waste Estimation System for Buildings Weight: kg Month

12 Advantages of the Waste Estimation System Enhanced estimation accuracy Allowing estimation of waste by type and in total over the construction period Facilitating a waste prevention and reduction plan by integrating work breakdown structure and construction schedule Facilitating waste management over the construction period

13 Future Developments of the Construction Waste Management System Develop generic templates based on the scope/size of different types of projects. Determine waste ratios of different materials in different stages of the construction process. Incorporate waste management plans into the project management system. Incorporate simulation techniques to address uncertainties. Considering impact of modern construction methods.

14 Sustainable Materials Technologies Extruded Wall Panels with Excellent Thermal Insulation Properties Reduction of Heat Loss from the Interior of Buildings lead to Energy Savings Environmental Friendly Magnesium-Based Binder Lower carbon emission and less pollution than Portland Cement during its production 1

15 Extruded Lightweight Panel with Foam Beads 2

16 Functional-structural extruded panel 3

Panels are made with these Aggregates Latent Heat Associated with Phase

17 Extruded Panels with Phase Changing Materials Porous Aggregates are impregnated with Paraffin which changes phase at o C Extruded Panels are made with these Aggregates Latent Heat Associated with Phase Change Moderate Temperature Changes Pearlite Before and After Paraffin Impregnation 4

18 Testing of Panel with Phase-Changing Materials 22 o C, 50% RH 22 o C, 50% RH Infra-red lamp for heating 250mm Insulating Material 3 thermocouples 75mm from surface to measure the air temperature OUTDOOR ROOM Specimen Separating Wall INDOOR ROOM 5

19 Change of Temperature on the Cool Side with Different Fraction of Paraffin Temp (deg C) % Paraffin 2% Paraffin Concrete Time (min) 6

20 Magnesium Based Binder Raw materials Magnesium powder Phosphate Fly ash or other industrial waste Water Reaction product KH 2 PO 4 + MgO + 6H 2 O = MgKPO 4 6H 2 O 7

21 Compressive strength Development M7 fly ash 0% M7 fly ash 40% M9 fly ash 0% M9 fly ash 40% 35 S c (MPa) Curing time (hour) Early compressive strength 8

22 Flexural strength Development 6 S f (MPa) 4 without redtardant w ith retardant Curing time (hour) Early flexural strength 9

23 Bonding strength Development 8 Curing at room tem perature C uring at -2 o C Bonding Strength (MPa) Curing age (day) 10

24 Dimension stability of MPSC Expansion rather than Shrinkage Specimen MPSC paste Portland cement paste Curing procedure After 7 days in lab air After 28 days in lab air After 7 days immersed in water From 7 th day to 28 th day set in lab air Length increase (%) % % % % 11

25 Field trial Site operation finished in 30 min 12

26 Inspection of the newly repaired beam Repaired column 13

27 Fiber Reinforced Concrete Tunnel Lining Segments When Tunnels are constructed with TBM, the Lining is often made of Pre-cast Concrete Segments assembled in place.

TBM when it is advanced forward - Loading during Service, from

28 Loading on the Segment The Segment needs to sustain - Bending Stresses during Storage (Stacking) - Localized Thrust from the TBM when it is advanced forward - Loading during Service, from Surrounding Ground, Water Pressure, etc Bending due To load eccentricity

29 Use of Fibers in the Tunnel Segment In Conventional Design, only Steel Reinforcing Bars and Stirrups are used in the Segment In the Construction of Metro 9 Line in Barcelona, the 12m Diameter Tunnel Lining Segments were constructed with Combined use of Steel Reinforcements and Steel Fibers Smaller Tunnels have been reinforced with Steel Fibers alone Copenhagen district heating tunnel (3.9km long, 4.2m internal diameter and 300mm thick) Gold Coast desalination tunnels (2.2km long, 2.8m internal diameter)

30 Advantages of Fiber Reinforcement Reduced Labor and Improved Construction Efficiency Reduced Thermal Cracking Stresses when Specimens are Removed from the Curing Chamber Reduced Cracking and Local Damages caused by Stresses during Stacking, Transportation and Placing of segments Improved Fire Resistance Fine PP Fibers burn out to produce channels for release of pressure from hot vapor On extended heating, softening of rebar (which are close to member surface) can lead to earlier collapse than segment with uniformly distributed fibers

Combined use of Steel Re-bar and Fibers Research Studies showed that the combined use of Steel Re-bars and Fibers provide an optimal solution Steel Re-bars only left on the edges to prevent

31 Combined use of Steel Re-bar and Fibers Research Studies showed that the combined use of Steel Re-bars and Fibers provide an optimal solution Steel Re-bars only left on the edges to prevent spliting under local stresses (from TBM or due to imperfect support condition) When Re-bars are replaced by Fibers, Material Cost is roughly the same SFRC 97kg Re-bar 31kg Re-bar + 35kg Fibers

32 Development Needs Design Method for Segments with Combined use of Re-bars and Fibers Testing Method to Obtain Basic Material Properties of Steel Fiber Concrete Computational Framework for Prediction of Lining Behavior Generation of Design Charts Quality Control Procedures Can learn from experience in Spain (Barcelona Metro Project)

LEED Building Design & Construction Contribution NC v4.0 (April, 2017)

LEED Building Design & Construction Contribution NC v4.0 (April, 2017) Fox Blocks is dedicated to contributing to sustainable building initiatives. We are a proud member of the USGBC and are driven to provide our products with the lowest carbon footprint possible to assist