Site Planning and Preperation

CONSTRUCTION EQUIPMENT SELECTION

Typically, light equipment is used to set the arches and install the decking. The equipment's reach needs to exceed the center (apex) of the arches so that they can easily be set. The hollow arch weight for a 12” diameter 50 foot span is approximately 200 pounds, and the same arch made out of 15" diameter would weigh 250 lbs. Thus, two men can easily lift and adjust the arches to their final position.

A concrete pump truck with a boom that can reach the apex of the arch maybe used to fill the arches with concrete or a traditional concrete bucket.

pump-truck.jpg

A loader/forklift/or excavator is needed for unloading the arches from the transport truck, material handling, and leveling equipment work areas.

CRAFT LABOR

The general craft skill requirements of a working crew are: layout foreman, light construction equipment operator, and four construction laborers, although two laborers might be sufficient in some cases. Typically, a working superintendent or foreman will have the skills necessary for layout and operating equipment.

SCHEDULE DURATION

Given a 50 foot wide bridge with geometry of 50 foot span, and 10 foot arch rise (above top of abutment) a representative duration for the following construction activities is listed below:

Arch Setting (12” diameter): 12 arches per eight-hour crew operation with six-person crew.

FRP Deck Installation 20 panels per eight-hour crew operation with six-person crew.

Arch Embedment Concrete Placement: four-hour crew operation placement with four-person crew (excluding concrete truck driver and concrete pump operator); plus two day cure time before subsequent operation other than light foot traffic on decking. The arch embedment can be part of a single foundation pour.

Arch Concrete Placement: two-hour crew operation with two-man crew (excluding concrete truck driver and concrete pump operator); plus 2 day cure time before subsequent operations other than light foot traffic on decking. 

Headwall Placement and Bracing: For FRP headwall system, eight-hour crew operation with four-man crew.