02 pre-construction activities 11 2 16 - oregon.gov · roduction recor d fre q uencies (m) per mix...

Section 2

Pre-Construction Activities

2.1 Review Plans 1

Review Contract Documents 3 Order of Precedence 4 Manual of Field Test Procedures 5 Non-Field Test Materials Acceptance Guide 9 Record Keeping 12 Staking 14 Reference Points 19 Common Staking Errors 23

Pre-Construction Activities Section 2.1

January, 2017 1

Review Plans

Preparations Begin in the Office

Bridge Plans


January, 2017 2

Early Plan Review

• Review preliminary and advance plans and specifications to minimize discrepancies on final plans.

• Check dimensions, angles, elevations, etc.

• Look for inconsistencies

• Inform PM & EOR about needed changes.

Plan Review Exercise

• Review the following bridge plan, footing plan and girder schedule.

• What items would you be concerned about when laying out the piling?


January, 2017 3

Review Contract Documents

Contract DocumentsInclude:

• Plans

• Standard Specifications

• Supplemental Specifications

• Special Provisions

• Change Orders


January, 2017 4

Order of Precedence Exercise

• Standard Specifications ___

• Project Plans ___

• Standard Drawings ___

• Contract Change Orders ___

• Other Contract Documents Not Listed ___

• Special Provisions ___

• Supplemental Specifications ___

• Approved, Unstamped Working Drawings ___

• Reviewed, Stamped Working Drawings ___

Contract Document Review Includes:

• Plan dimensions and angles

• Horizontal and vertical control information

• Elevations (deck, beam seat, footings, etc)

• Soil logs, soil reports and other foundation information

• Reinforcement details


January, 2017 5

Contract Document Review Includes:

• Material quantities

• Review and note any special features or unusual requirements

• Field testing requirements

• Review ODOT Nonfield-Tested Material Acceptance Guide

Field Testing

(00540.16)Sample &Test PerMFTP

FIE

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ngle

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gle

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qu

enci

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over

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ngle

day

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³

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uenc

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cret

e ba

sed

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aily

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ortio

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to 4

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a s

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yQ

uant

ity O

ver

75 m

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et p

er e

ach

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or p

ortio

n th

ereo

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et p

er e

ach

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por

tion

ther

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Proj

ects

ove

r 100

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all

clas

ses

QA

Tes

ting

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ricPr

ojec

ts u

nder

100

m³ a

ll cl

asse

s

1/40

0 m

³ p

er c

lass

min

imum

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lass

(M)

(S

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est a

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inim

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tabl

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evie

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all

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epre

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all c

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all c

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00 m

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r cl

ass

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ntity

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)

Page 18


January, 2017 6

QC Testing Frequency

QC Testing Frequency Example

Bridge Deck Pour: 350 cy of HPC4350.

How many sets of cylinders are required?

350 cy / (100 cy/set) = 3.5 = 4 sets


January, 2017 7

QC Testing Frequency Exercise

Bridge Deck Pour: 850 cy of HPC4350.

How many sets of cylinders are required?

QA Testing Frequency


January, 2017 8

QA Testing Frequency Example

Total of 400 cy of HPC4350 for project.

How many QA tests are required?

400 cy / (500 cy/test) = 0.8 = 1 QA test

QA Testing Frequency Exercise

Total of 750 cy of HPC4350 for project.

How many QA tests are required?

ODOT Quality Assurance Program

November 2012 2

Small Quantity Table

Section Type of Material Approximate

Quantity

00330 Earthwork (Embankment) 500 yd3

00330 Earthwork (Excavation) 500 yd2

00345 & 00346 Lime & Cement Treated Subgrade 2000 yd2

00390 & 00395 RipRap & Rock Gabions 100 yd3

00405 Ditch & Trench Excavation, Bedding and Backfill 50 yd3

00440 Commercial Grade Concrete 50 yd3

00495 Trench Resurfacing 500 Ton

00510 Structure Excavation and Backfill 500 Ton

00596 Retaining Walls 500 Ton

00641 & 00642 Aggregate Sub-base, Base & Shoulders 2000 Ton

00680 Stockpiled Aggregate 2000 yd3

00730 Asphalt Tack Coat 50 Ton

00735

Emulsified Asphalt Concrete Pavement

(includes asphalt cement) 2500 Ton

00744

Minor Hot Mix Asphalt Concrete (HMAC-each Level)

(includes asphalt cement) 2500 Ton

00745

Hot Mix Asphalt Concrete (HMAC-each Level)

(includes asphalt cement). 2500 Ton

Con

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r th

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New

mat

eria

ls o

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ater

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re in

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uent

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sed

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de.

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sult

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Con

trac

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r ac

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abor

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ture

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Pro

of o

f Lic

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/Cer

tific

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rent

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App

licat

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ntat

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Qua

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ntify

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eria

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January, 2017 9

NFTMAG ExerciseWhat acceptance documents are required for the following?

• Rebar on QPL. ___________

• Rebar not on QPL. ___________

• Epoxy Rebar on QPL. ___________

After Document Review

• Report any discrepancies to your Project Manager.

• Contact Engineer of Record for clarification.


January, 2017 10

Pre-construction Conference

• Hold pre-construction conference prior to any work beginning.

• Should be held within 30 days of the notice to proceed.

Contractor Submittals

• Work schedules

• Traffic control plans

• Subcontractor approvals


January, 2017 11

Contractor Submittals Cont’d:

• Material approvals

Identification of concrete plants and prefabrication plant

Concrete mix designs

• Working drawings

Working Drawings

Approved submittals required for the following:

Shoring, cribbing, or cofferdams

Falsework and load bearing forms

Prefabricated items

Post-tensioning

Fabricated steel items, and

Reinforcing steel


January, 2017 12

PlansKeeping up with the latest information . . . .

BID PLANS

WORKING PLANS (SHOP DRAWINGS & SUBMITTALS)

AS-BUILT PLANS

Record Keeping

See Appendix C For Forms


January, 2017 13

In the Field

On-Site Familiarization

• Determine the locations of existing utilities.

• Note any features or circumstances that may require special attention such as wetlands or endangered species habitat.

• Ensure the proper implementation of the traffic control plan.


January, 2017 14

Staking

Staking Responsibilities

• Determined by Contract

– Agency provided construction stakes, lines and grades

– Contractor provided construction stakes, lines and grades


January, 2017 15

Accompany Survey Crew

• Find out where the stake locations are and what notations are used

• Promotes discussion of plan location interpretations between Inspector, Surveyor, and Contractor

• Check accuracy of staking by measurements and cross measurements

Preserving Stakes & Monuments

The contractor is responsible for preserving stakes and monuments; accurately using these controls; and setting own stringlines, batterboards, etc.


January, 2017 16

Staking• Horizontal alignment

– Centerline stakes

– Reference points

• Vertical alignment

– Benchmarks

– TBM’s

– Grade stakes

Staking Tolerances (SP00305.40)


January, 2017 17

Staking Tolerances (SP00305.40)

Substructures: +/- 0.03 ft (3/8”) for horizontal & vertical position.

Superstructures: +/- 0.02 ft (1/4”) for horizontal & vertical position.

Horizontal Alignment

• Start with running in centerline

– Set control points (Curve points, POT’s, etc.)

– Set abutment and bent centerlines where possible

• Set reference points

– For abutment and bents where possible


January, 2017 18

Distances

• Lengths are divided into 100 foot long sections called stations.

• Interval stakes along an established line are ordinarily laid down at 100 foot intervals called full stations.

• If a marker stake is placed elsewhere along the line, it is called a plus station.

Example: A point half way between station 10 & 11 is labeled “10+50”

Station Equation Example

Const Line has equation 10+50Bk=10+80Ah

Bent 1 has station of 10+00


What is the distance between bents?

(11+30)-(10+00)-((10+80)-(10+50))=

130 ft – 30 ft = 100 ft


January, 2017 19

Station Equation Exercise

Const Line has equation 12+10Bk=12+90Ah



What is the distance between bents?

Reference Points


January, 2017 20

Reference Points

• Reference points or offset stakes are usually 2”x2”x14” wood stakes (hubs) driven flush with ground surface

• A tack or small nail on the top of the wood stake marks the exact reference point

• At least two permanent points should be set for each abutment


January, 2017 21


January, 2017 22


January, 2017 23

Common Staking Errors

• Using incorrect working line

• Staking and elevation controls have been disturbed

– Always check control points against previous work

• Not checking bench marks prior to start of construction

Common Staking Errors Cont’d:

• Not tying into a second bench mark when setting or checking elevations

• TBM’s are set in a level circuit, not a side shot

• Turning the wrong skew angle


January, 2017 24

Staking for Structures

The layout of the structure and the references should be double checked by using a different survey approach. All survey notes should also be independently checked.

Benchmarks

Place On New Bridges