土木工程英文演讲模板

Process Excavation Soil Dump Steel Plant Process Steel Placement Excavation Site
Soil Dump Steel Plant Steel Access Placement Site Access
Concrete Plant Concrete Plant Onsite Mixing and Onsite Mixing and Testing Testing Concrete Pumping Vibration Concrete Pumping Concrete Curing Vibration Concrete Curing
Labourer
Foreman
Operate Concrete Truck Walking Shovelling Directing Concrete
Site Supervisor
Idle Vibrating
Concrete Truck Operator
0%
10%
20%
30%
40%
50%
60%
70%
Lean construction adopts the ideas of lean production which is to maximize value and minimize waste.
•
Eliminate waste
• Identify Value-adding Activities and No Value-adding Activities • Eliminate No Value-adding Activities in any processes
Site Layout
• Occupational Health and Safety (OH&S) regulations regulate all worksites. • Strict corporate safety policies
• All workers must wear PPE • Pre Job Inspection Checklist for all new tasks, Near Miss Incidents have to be reported.
Duration per Pile
1:12:00
1:04:48
0:57:36
0:50:24
0:43:12
0:36:00
Idle Active Contributory Active
0:28:48
0:21:36
0:14:24
0:07:12
0:00:00 1 2 3 4 5 6 Total
Labour Utilization Factor
Owner Engineer Contractor
BC Ministry of Transportation MMM Group Ltd. PCL Constructors Westcoast Ltd.
• Funded by the Infrastructure Stimulus Package • Construction started on January 17th, 2011 and expected to be completed on April 29th, 2011
Steel Plant
Steel Placement
Site Access
Concrete Plant
Onsite Mixing and Testing
Concrete Pumping
Vibration
Site Preparation Hammer Rate Mobilization Time Truck Loading Rate Truck Dumping Rate Storage Capacity Truck Prep. Time Fabrication Rate Welding Rate Inspection Time Storage Time Delivery Time Distribution Time Steel Tying Rate Mobilization Time Crane Preparation Time Site Access Clearance Time Roadbed Construction Time Average Speed Limit Expected Delay (Congestion) Concrete Production Rate Inspection time Storage Time Distribution time Position Equipment Mixing Time Inspection Time Truck Preparation Pumping Rate Operation Rate Mobilization Time, Mobilization Time Setup time Vibration Time Position Vibrator
• • •
Long cycle: 15 minutes Short Cycle: 5 minutes Average cycle: 9
•
minutes Many areas allow savings
•
More crew were used than necessary
More idle time • More walking time
Process
Input of Activities
Resource Usage Factor (Assumptions) 3 1 2 2 2 2 1 3 3 1 2 2 2 2 2 2 2 2 2 2 2 1 2 2 1 2 1 2 2 2 2 2 2 2 2
Excavation
Soil Dump
•
Pull inventory
• Deliver Material in time (Don’t slow down due to material delivery)
•
Reduce variability
• Variability occurs in any process where dependent operations have different production rates • Design buffer actives
•
Activity Overview
• • Activity Sequence Field Observations and Constraints
•
Data Analysis
• • Data Collection Methodology Work Sampling and Video Technique Results
Team PC源自文库-UBC PCL-
Kenny Kutyn
Shilin Sun
Jeffrey Wong
Gordon Zhou
•
Introduction
• • • • Project Background and Overview Pile Driving Process Equipment and Materials Site Safety
80%
90%
100%
•
Labourer, Foreman and Site Supervisor spent much time idle
Cycle Chart
0:00:00 Concrete Pour Average Concrete Pour Short Concrete Pour Long Vibrate Average Vibrate Short Vibrate Long Shovel Average Shovel Short Shovel Long Idle Average Idle Short Idle Long 0:02:53 0:05:46 0:08:38 0:11:31 0:14:24 0:17:17
•
•
Fixing errors should have waited until the end
•
No learning curve observed
•
Variations in cycle time offer many different ways to increase efficiency
•
• Activity is 1 week behind schedule due to poor weather • Aggressive Schedule Little Float
WORK SAMPLING
LUF Average: 0.49 0.34
LUF (.25) Average:
WORK SAMPLING
• 10 - 610 OD X 12.7 concrete-filled steel pipe piles were driven to a depth of 60m. • 5 will be for the north abutment and another 5 for the south abutment foundations. • Pile capacities will have the maximum of 1655kN lateral resistance. • The study will focus on the concrete pumping for steel pipe piles for the RBS abutment foundations
LUF Average: 0.41 0.29
LUF (.25) Average:
• •
• •
•
Activity: concrete pile pour Crew: concrete crane operator, site supervisor, foreman, labourer Active: concrete pour Active Contributory: vibrating, site cleanup Idle: walking, talking
Equipment Excavator and Mounted Drill Pile Driving Rig Concrete Vibrator
Material 30MPa Concrete 10m 12-25M rebars 10/15M spiral casing
Concrete pumping
Externalities
Poor Weather (rain) No concrete pouring
Discussion with Site Personnel
• Site cleanliness • Project Management “congested worksite” Challenges
0.9
• •
0.8
•
0.7
0.6
0.5 LUF 0.4 LUF (.25)
LUF: 0.74 LUF(.25): 0.61 Crane operator was 98% active, increased LUF of entire activity
0.3
0.2
0.1
0 1 2 3 5 Total
Crew Balance
Human Resource: • 2 to 4 crew members
Duration: • 5-15 minutes
Activity Flow Diagram
Activity Process Chart
Site Logistics
Narrow workspace Highly congested Limited entry points 7 workers vs 30 workers
•
Recommendations
• Lean Construction
• Construction of a southbound rapid bus connection lane with a bus portal structure north of Highway 7 and the Mary Hill Bypass • The bus portal structure to accommodate the gateway project highway 7 bus lane • Project valued at $16 million dollars. Construction cost is $2.1 million dollars.