July 2010. Training Outline Part 1 Cost-per –SF and Detailed Estimate Pay Item Detailed Estimate...
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Transcript of July 2010. Training Outline Part 1 Cost-per –SF and Detailed Estimate Pay Item Detailed Estimate...
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)