feasibility of underground short-haul freight pipelines ... · • type: international air...

Feasibility of Underground Short-Haul Freight Pipelines-Application to the DFW Airport

Principal InvestigatorsSia Ardekani, PhD, PE

Mohsen Shahandashti, PhD, PE

Graduate Research Assistants:Ms. Ferika Farooghi, PhD Candidate in Construction

Mr. Sirwan Shahooei, PhD Candidate in TransportationMr. Ehsan Zahed, PhD Candidate in Construction

Department of Civil Engineering The University of Texas at Arlington

Table of Content

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2. Chapter twoDESIGN AND CONFIGURATION

Identifying Terminal PointsFreight Sizes and DimensionsDesign of Tunnel and VehiclesTerminal Design

3. Chapter threeOPERATIONAL ATTRIBUTES

Running Gear SystemsHeadwaySpeedCapacityTerminal Operations

Geological and Geotechnical StudyConstruction of TunnelsConstruction of shafts and entry/exit rampsConstruction of TerminalsCost Analysis

4. Chapter FourCONSTRUCTION METHODS AND

COST ANALYSIS

1. Chapter OneINTRODUCTION AND SCOPE

5. Chapter FiveCONCLUSIONS AND RECOMMENDATIONS

Chapter One: INTRODUCTION AND SCOPE

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Advantages of the System

Reduce the truck traffic

Improve safety

Enhance Efficiency

Improve Air quality

Help Private shippers (FedEx, UPS, U.S. postal service )

Reduce adverse environmental impacts such as emissions and noise

The proposed UFT line:

• Transports standard air crates • One end of the line is the airport

Delta/United cargo terminal• The other end is a warehouse off the

secured airport area

Chapter Two: Identifying Terminal Points

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• Close to the major highways

• Consistent land use with surrounding (industrial)

Selection Criteria

Chapter Two: Identifying Terminal Points

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Suggested Locations According to the DFW Masterplan:

• Northwest Logistic• International Commerce Park• Proposed Intermodal Freight Terminal

3• Close to the TX-161 highway• Located in Industrial zone• located in airport area • UFT line length of 8,100 ft

1

2

• Congested surrounding highways (121,114)• Longer UFT line lengths• Interrupting taxiways during construction

Chapter Two: Freight Size and Dimensions

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• Type: International Air Transport Association (IATA) A-2 crate• Suitable for: B747, B747F, DC8, DC10, A300/F• Size: 125 inches long, 88 inches wide, 79 inches high (317

cm×223 cm× 200cm) • Maximum gross weight: 13300 lbs. (6.033 kg)• Internal Volume: 445 ft3 (12.6 m3)

Chapter Two: Design of Tunnel and Vehicles

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• Tunnel section: Cylindrical• Tunnel depth: 40 ft. • Propulsion system: Linear Induction Motors (LIMs)• Crate dimension: (7.8 W× 7.5 H× 14.3 L)• Vehicle type: Open flat-bed with a rectangular cross-section

Chapter Two: Design of Tunnel and Vehicles

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Chapter Two: Design of Terminal

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Schematic design

• Loading• Unloading 1- Two similar sections

6- Two layover/maintenance rails

8- 8-inch thick concrete pavement

5- Storage capacity of 70 crates

2- Terminal has two lines: a truck line and an access line

7- Two truck stations

4- Managerial Building 1,800 sq. ft

9- Four forklifts + One back-up forklift

3- The total area of the terminal without access roads is 21,700 sq. ft

• Loading• Unloading

Chapter Three: OPERATIONAL ATTRIBUTES

Operational Attributes

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Running Gear Systems

Headway

Speed

Capacity

Number of forklifts

Terminal dwelling time

Trip time

Steel wheel and rail

51 mph

Six minutes

240 crates per direction per day

One minute

Two minutes

Four Operating + One Backup in each terminal

Chapter Four: CONSTRUCTION METHODS AND COST ANALYSIS

Construction Methods and Cost Analysis

GEOLOGICAL AND GEOTECHNICAL STUDY

CONSTRUCTION OF TUNNELS

CONSTRUCTION OF SHAFTS AND ENTRY/EXIT RAMPS

CONSTRUCTION OF TERMINALS

COST ANALYSIS11/17

Chapter Four: GEOLOGICAL AND GEOTECHNICAL STUDY

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COST ANALYSIS


Sources for geological and geotechnical studies:

• Geological Atlas of Texas (USGS 2017)

• Two previous DFW Airport projects:- Express North (W1) Parking Expansion- DFW DPS Headquarters 2900 E Street

Different soil layers:- Top soil- Stiff Lean Clay (CL)- Stiff to very stiff Fat Clay (CH)- Gray hard Shale (Shaley Clay)

Groundwater level fluctuation 14 to 40 ft. below the surface Need for dewatering

Chapter Four: CONSTRUCTION OF TUNNELS






COST ANALYSIS


Tunneling:

Tunnel Boring Machine (TBM) • Reinforced precast concrete segments• 20% slope ramp• 13-ft. diameter access shaft (3,500 ft. from the UFT

origin terminal )• 75 ft. of the tunnel entry/exit ramps (cut-and-cover

method)

Disposal of Tunnel Spoils:

Continuous Belt Conveyor System13/17

http://agjv.no/news/30-inside-the-tbm

Chapter Four: CONSTRUCTION OF SHAFTS AND ENTRY/EXIT RAMPS

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COST ANALYSIS


Dewatering For Construction of Access Shaft and Tunnel Entry/Exit Ramps: Pumping Method

The main purpose:• Facilitate installation of the support systems.• Improve soil stability allowing excavation to proceed in dry conditions.

Supporting Shaft and Tunnel Entry/Exit Ramp Walls:

Soldier Pile and Lagging Method

• fast-to-construct• cost effective

Chapter Four: CONSTRUCTION OF TERMINALS

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COST ANALYSIS


• 16,200 square feet of pavement for the access and stacking areas• 8-inch thick reinforced concrete slabs • 1,800 square feet office building (one-story timber office buildings)

including office space, storage, operation rooms, and restrooms

Chapter Four: COST ANALYSIS

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COST ANALYSISCOST ANALYSIS

Cost Components Costs ($)

Tunnel Construction 28,730,700Tunnel Entry/Exit Ramp 460,760Tunnel Invert Concrete 944,557Terminal Development 1,020,600Tracks 1,576,903Freight Vehicles 84,000LIM System 125,000Forklifts 900,000Total 33,842,520

Capital Costs of The UFT (2016 dollars)

Annual Costs of The UFT (2016 dollars)Cost Components Costs ($/year)

Tunnel Operation and Maintenance

1,500,000

Terminal Maintenance 11,000LIM Maintenance 6,250LIM Power Consumption 17,175Terminal Electricity Consumption 28,800Forklifts Electricity Consumption 66,000Administrative Cost 2,913,400Total 4,542,625

Questions

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References

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