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Prefab City A compendium of strategies for prefabricated building techniques in urban environments


by Ground: Road Transportation of pre fab elements in a urban environment is constrained by a number of obstacles. One of which is the complex network of roads that comprise many cities. In order to deliver pre fab modules to a site many different sized trucks need to be considered as part of the delivery process. Each truck has its own set of limitations for maximum freight weight. All of these factors must be considered when siting a pre fab project in an urban context.

Truck Types Pickup Truck Advantages: Can easily navigate small urban streets Disadvantages: Lowest freight weight capacity, very limited by size

Single Unit Truck Advantages: Comparitively narrow width (fairly easy for navigating small streets). Mid size compacity for freight (panels could fit) Disadvantages: Constrained by height.

Dump Truck

Advantages: Large freight weight compacity Disadvantages: Width could be problematic when trying to traverse complex sites.

Semi Tractor Trailer Truck Advantages: Largest carrying capacity; multiple trailer options to facilitate different sized pieces. Disadvantages: Hardest to maneuver complex street network.


Truck Dimensions Transportation • 14 PRECEDENTS

CONTEXT

DEPLOYMENT

DETERMINANTS

INTRODUCTION


Semi-Trailer Load Capacities Semi-Tractor trailer trucks have the greatest carrying capacity. There are a number of options

48’-0”

for the trailer; some maximize the length, some height of the element that needs to be transported. Outlined below are the options.

8’-6” 8’-6”

48,000 lbs.

Flatdeck Trailer 11’-0” 37’-0” 8’-6”

a

10’-0”

b

8’-6”

48,000 lbs. a: Height restriction for truck (varies by state from 13’-6” to 14’-6”) b: Height limit for vertical clearance (typ. 14’-0” for urban areas, 16’-0” rural)

Vertical Clearance for Semi-Trailers

Single Drop Trailer 10’-0”

52’-6”

29’-0” 9’-0”

8’-6” 11’-6”

9’-2” 45,000 lbs.

Box Trailer

8’-6”

*

45,000 lbs. maximizes height

Double Drop Trailer

10’-0” 8’-6”


INTRODUCTION

48’-0” 80’-0”

8’-6”

45,000 lbs. maximizes length

*Flatdeck Trailer Stretched

DETERMINANTS

8’-6” 14’-0”

48,000 lbs.

8’-6”

Oversized Load

10’-0”

8’-6”

DEPLOYMENT

48’-0”

63’-0”

8’-6” 10’-0”

8’-6”

Single Drop Trailer Stretched

16’-0”

*Way Oversized Load

CONTEXT

43,000 lbs.

48,000 lbs. permits required

10’-0” 50’-0” 11’-6”

9’-0”

PRECEDENTS

8’-6”

10’-0”

*

40,000 lbs. maximizes height

Double Drop Trailer Stretched

8’-6”

*

dimensions contrained by road restrictions of local municipalites

Super Oversized Load Transportation •

16


Roadway Design & Obstacles Roadway design can either help or hinder the transport of prefab elements to site by truck. Outlined below are the guidelines for the dimensions of driving and parking lanes in a city.

a1

b1

c

b2

a2


INTRODUCTION City Utilities

Lighting

Signage

DETERMINANTS

Street Furniture

Pedestrian Utilities

CONTEXT

DEPLOYMENT

Landscape

PRECEDENTS

Truck Turning Obstacles ‘Making the turn’ is one of the challeneges of truck transport when building in an urban environment. The many obstacles the city presents (parked cars, telephone poles, stop signs, etc.) make routing a truck to site one of the most important parts of the process.

Parallel Parking Transportation •

18


Truck Turning Radii The swept path a truck takes as it makes a right

Swept path of truck

60°

turn is a critical moment. To the right is a diagram that explains the logics of how a truck makes a turn. The most common trucks used for transport in the city are the standard semi-truck and the

60’ radius from point on sidewalk

single unit truck. The paths for oversized loads need to be considered if larger elements need to get to site.

Critical points that determine swept path

Truck Making 60° Turn

60°

60°

90°

90° a

a

b b

a: 53’-0”

180°

b: 8’-6”

a: 53’-0”

180°

b: 8’-6” critical swept path

Standard Semi-Truck

critical swept path

Single Unit Truck


INTRODUCTION DETERMINANTS DEPLOYMENT 60°

60°

90°

90°

90°

b

*cannot make a 180° with a 60’ radius

b

a: up to 80’-0”

a: 48’-0”

b: 8’-6”

b: 16’-0” critical swept path

Stretch Semi-Truck

b

180°

critical swept path

Oversized Load (Width)

180° a: 75’-0” or 1/3 truck bed length b: 8’-6” critical swept path

Oversized Load (Length) Transportation • 20

PRECEDENTS

a

a

a

CONTEXT

60°


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