GUIDANCE FOR USING THE NEW LRE BRIDGE COMPONENT

July 2010

Training Outline Part 1

Cost-per –SF and Detailed Estimate Pay Item Detailed Estimate

Segments Bridge Level Data Segment Level Data Supports

Part 2 Sketches Supporting Tables and Other Information

Cost-per-SF & Item Details Two methods are now available for

estimating bridges: Cost-per-square foot (no change from

previous) Pay item detailed

You can choose to use either or both:

Primary Bridge Estimate

If you choose to have both a cost-per-square foot and a detailed estimate, you must designate one as the Primary: For reporting and review (similar to Primary Version

designation); Not limited to LRE Coordinators; Can be changed at any time (if the project is not in

Blocked status).

Cost-per-Square Foot Method The cost-per-square foot method will

remain the same as it was previously. Screen is the same, except the fields for

Superstructure and Substructure types have been removed.

For projects that had bridges prior to the implementation of the detailed component, the implementation did not affect (or change) the existing costs-per-square foot.

The remainder of this presentation will apply to the Pay Item Detailed method of

estimating bridges...

Designed for common bridge types (the “90%”)

Pay item detailed component is not intended for estimating “specialty” bridges Specialty bridges can be estimated by the cost-

per-square foot method, or as X-Items.

Pay Item Detailed Method

Superstructures

Substructures

Foundations

FL I-Beam Pile Bents Prestressed Square Piles (18” & 24”)

FL U-Beam Drilled Shaft Bents

Drilled Shafts (48” & 60”)

Slab (Cast in Place)

Multi Column Steel Piling (14 x 89 and 14 x 117)

Steel Box Hammerhead

Steel Plate Girder

Bridge Segments

Bridges that have varying types (or heights) can be separated intoSegments for moreaccurate estimating.

A bridge can have oneSegment, or many.

For each segment:Superstructure, Substructure and Foundation types are selected from a list.

First and Last Segments

When you initiate a detailed estimate, the system assumes there is one segment.

The first segment created is automatically designated as the “First” and “Last” segment:

End Bents are automatically added to the segments designated as “First” and “Last”.

Bridge Segments

If multiple segments are created, you must designate “First” and “Last” Segments so that end bent quantities will be appropriately generated:

Bridge Segments

Example of a bridge requiring multiple segments for variations in height:

Bridge Level and Segment Level Data Data that remains consistent through

all segments is input on the “Bridge Level” screen. Bridge level data relates primarily to the

type of construction and the characteristics of the bridge deck (typical section, railings, etc.).

Data that changes between segments is input on the “Segment Level” screen. Segment Level data relates primarily to

dimensions, and types for superstructure, substructure and foundation.

Bridge Level Data

User Input / Selection: Bridge Typical Section Construction Type Average Skew Angle Sidewalk Widths Railings, Left & Right Traffic Separator Width

Generated Values: Total Cost and Cost/SF Approach Slabs Total Length and Average

Width (from Segments) Quantities for Displayed Pay items

Bridge Typical Sections

New Bridge Defaults When you create a new

bridge a single segmentis created, with defaultmeasurements andcharacteristics.

The Bridge Level Detailscreen will display the InitialSegment Default values. These values will not be

accurate for your bridge; They are there because LRE

must have a “starting point”; You can change them here or on the Segment

Details screen.

Segment Level Data User Input, per Segment:

Segment Dimensions & Clearance

Over Land or Water Number of Intermediate

Supports Superstructure, Substructure,

Foundation Types (selected)

Calculated Values: Average Pile Length Span Length Quantities for all related

pay items

Segments & Intermediate Supports The “Number of Intermediate Supports” is

an input value on the segment, estimated by the coder. There will be a default value for the first

segment, based on total bridge length and other factors (bridge loads, etc.). The default value can be changed.

If additional segments are created, there will not be a default number of intermediate supports. The number will have to be estimated by the coder and manually entered.

This value has a significant impact on the quantities calculated!

Example of Segments and Supports The example bridge below has been

separated into 3 segments, for differing heights;

Intermediate Support numbers, per segment are: Segment 1 = 0, Segment 2 = 2, Segment 3 =

0

Don’t count end bents! (Automatically included.)

The program automatically adds the quantities for

this pier into Segment 3

The program automatically adds the quantities for

this pier into Segment 2

These piers are counted as input

values in Segment 2

Bridge Optional Tab

This tab contains input fields for several items that are commonly used on bridge projects, but do not have generated quantities. Removal of Existing Structures Sheet piling Protection of Existing Structures Navigation Lights, Fender System, Fiberglass Piles Slope Protection Expansion Joints

Takes the place of X-Items for these items.

Quantities must be included, but prices will be generated.

Bridge Widening Rules

The program requires that one of the widening types shown here be selected.

If the specific widening type falls outside of these options, the estimate should be based on the square foot cost or by using X-items.

Bridge Widening Rules

Widening Two Sides- The program is set up for widening on one side of the bridge. If the project requires widening on both sides, run as separate bridges and sum the quantities.

Match Existing - In general, the superstructure type of the bridge widening should always match the existing.

Sketches and Supporting Information

Typical Creek/Canal Crossings

Florida I- Beams48” Dia. Drilled

Shaft Bent

Flat Slab18” Pile Bent

Typical Overpass Bridges

Florida U-Beam

Multi-column Pier

Steel H-Piles

Florida I-BeamDrilled Shaft

Bent48” Dia. Drilled

Shafts

Steel I-BeamMulti-Column Pier18” Prestressed

Piles

Multi Column Piers

Multi-Column Piers Come in Different Shapes

Typical Overpass Bridges

Some overpass structures can be a long simple span (number of intermediate supports = 0).

Here is an example of a long steel plate girder overpass span:

Typical Interchange RampsSteel I-BeamHammerhead

24” Prestressed Piles

Steel BoxHammerhead

24” Prestressed Piles

Hammerhead Piers

Hammerhead Piers come in different

shapes

Hammerhead Pier Options

For high-level water crossings, two hammerhead piers set side-by-side may be a cost effective design solution given the wide bridge width. This can be approximated in the program by inputting one-half of the structure with a single hammerhead pier, then doubling the quantities. Short land piers are more likely to use multi column intermediate supports.

The program assumes a single hammerhead pier for a given bridge cross section and limits the bridge width to less than or equal to 70 ft.

Superstructure Sketches

Substructure Types

Foundation Elements

Span Length GuidelinesSpan Length Ranges by Superstructure

Type

Modify the number of intermediate supports within the segment or modify the structure type such that the calculated average span length falls within the

span ranges given in the table.

Min Span Max. Span

FIB 40’ * 175’FUB 40’ * 135’CIP Flat Slab 15’ 50’Steel Box 120’ 320’Steel Plate Girder 120’ 320’

* When the calculated average span length exceeds 130’, verify feasibility of hauling FIB

to the bridge site.

Bridge $ / SF Screen

Optional Items

Screen

Bridge Level Detail Screen

Bridges Tab

Bridge Summary

Screen

Edit Cost / SF

Edit Detail Cost

Segments

Summary

Segment Detail

Bridge Screens Flow

Optional Items Tab

Segments Tab

End(Back to

Summary or Bridge Tab)

End(Back to

Summary or Bridge Tab)