H IGH E ARLY S TRENGTH C ONCRETE & UHPC C ONNECTIONS UHPC O - - PowerPoint PPT Presentation

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H IGH E ARLY S TRENGTH C ONCRETE & UHPC C ONNECTIONS UHPC O - - PowerPoint PPT Presentation

Oct 27, 2022 508 likes •698 views

B RIDGE 1-438 N ICH OLAS D EAN D EL D OT B RID GE D ESIGN T IME IS OF THE E SSENCE E XISTING S ITE C ONDITIONS T IMING P RECAST I TEMS H IGH E ARLY S TRENGTH C ONCRETE & UHPC C ONNECTIONS UHPC O VERLAYS P ROSPECTIVE B

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SLIDE 1

N ICH OLAS D EAN D ELD OT B RID GE D ESIGN

BRIDGE 1-438

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SLIDE 2
  • TIME IS OF THE ESSENCE
  • EXISTING SITE CONDITIONS
  • TIMING
  • PRECAST ITEMS
  • HIGH EARLY STRENGTH CONCRETE & UHPC

CONNECTIONS

  • UHPC OVERLAYS
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SLIDE 3
  • PROSPECTIVE BIDDER NOTE #11
  • ARMY CORPS OF ENGINEERS NATIONWIDE PERMIT

PROGRAM EXPIRES 3/ 17/ 17

  • MUST HAVE EXECUTED CONTRACT, WHICH ALLOWS APPROVED PERMITS

A 1 YEAR EXTENSION

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SLIDE 4
  • EXISTING CONCRETE WEIR AND USGS

MONITORING STATION

  • USGS CONTACT
  • ANTHONY TALLMAN
  • 302-734-2506 EXT. 223
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SLIDE 5
  • UTILITY POLES AND TREES IN CLOSE PROXIMITY TO ROADWAY
  • CRANE CONSIDERATIONS
  • MAY NOT BE ABLE TO SWING BOOM
  • LARGER CRANE MAY BE REQUIRED
  • STAGING CONSIDERATIONS
  • STORAGE OF EQUIPMENT
  • DELIVERIES
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SLIDE 6
  • 7 DAYS FOR CLEARING AND GRUBBING IN ADVANCE OF UTILITY

RELOCATIONS (SINGLE LANE CLOSURE PROVIDED BY CONTRACTOR)

  • 42 CALENDAR DAYS FOR UTILITY RELOCATIONS (SINGLE LANE

CLOSURE PROVIDED BY CONTRACTOR)

  • 33 CALENDAR DAYS FOR BRIDGE CONSTRUCTION (FULL ROAD

CLOSURE PROVIDED BY CONTRACTOR)

  • 4 WEATHER DAYS ALLOTTED SPECIFICALLY FOR BRIDGE CONSTRUCTION
  • 7 CALENDAR DAYS AFTER BRIDGE CONSTRUCTION IS COMPLETED

FOR DELMARVA POWER TO RE-ENERGIZE (SINGLE LANE CLOSURE PROVIDED BY CONTRACTOR)

  • CONTRACTOR NEEDS TO COMMUNICATE WITH UTILITY COMPANIES

ABOUT TIMING

  • CAN BRIDGE WORK OCCUR CONCURRENTLY WITH UTILITY WORK?
  • RELOCATIONS MAY NOT REQUIRE ENTIRE ALLOTTED TIME
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SLIDE 7
  • 100% PRECAST BRIDGE ELEMENTS
  • TIGHTER TOLERANCES
  • PLACEMENT OF ELEMENTS MUST BE PRECISE/ ACCURATE
  • 14” X 14” PRECAST PILES
  • TIGHTER TOLERANCE FOR DRIVING (2” IN ANY DIRECTION AT TOP OF PILE)
  • 24” X 48” PRECAST ADJACENT BOX BEAMS
  • EXTERIOR BEAM – PRECAST BARRIER
  • HEAVY, ECCENTRICALLY LOADED LIFTS
  • SHEAR KEY CONNECTIONS
  • UHPC SHEAR KEYS
  • PRECAST ABUTMENTS
  • SHIPPED IN TWO SECTIONS PER ABUTMENT
  • HEAVY LIFTS
  • PRECAST WINGWALLS
  • WINGWALL SECTIONS TO BE CANTILEVERED OFF OF ABUTMENTS
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SLIDE 8
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SLIDE 9
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SLIDE 10
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SLIDE 11
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SLIDE 12
  • ABUTMENT/ PILE CLOSURE POUR
  • WINGWALL/ ABUTMENT CONNECTION
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SLIDE 13
  • DIFFERENT SHEAR KEY THAN TYPICAL
  • SURFACE PREPARATION AND INSTALLATION ARE KEY
  • REACH OUT TO UHPC MANUFACTURERS BEFORE CONSTRUCTION BEGINS
  • DIFFERENT MATERIAL PROPERTIES THAN NORMAL CONCRETE OR GROUT
  • UHPC REPRESENTATIVE HAS A GREAT DEAL OF EXPERIENCE AND

KNOWLEDGE

  • SATURATED SURFACE DRY (SSD) & WATER TIGHTNESS
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SLIDE 14
  • UHPC BACKWALL TO BE POURED SIMULTANEOUSLY

WITH SHEAR KEY JOINT

  • BACKWALL TO BE POURED TO TOP OF BEAM
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SLIDE 15
  • NEW PRODUCT
  • DIFFERENT MATERIAL PROPERTIES THAN NORMAL CONCRETE AND

GROUT

  • STIFFER THAN THE UHPC MIX FOR JOINTS
  • SURFACE PREPARATION AND INSTALLATION ARE KEY
  • REACH OUT TO UHPC MANUFACTURERS BEFORE CONSTRUCTION BEGINS
  • DEFER TO UHPC REPRESENTATIVE’S EXPERTISE
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SLIDE 16
  • TIMING
  • 33 CALENDAR DAYS FOR BRIDGE

CONSTRUCTION

  • PRECISION
  • ACCURACY IN FIELD MEASUREMENTS AND

PRECAST ELEMENT PLACEMENT ARE KEY

  • UHPC
  • NEWER MATERIAL
  • QUALITY CONTROL
  • FOLLOW UHPC

REPRESENTATIVE’S ADVICE

  • PREPARE A PLACEMENT PLAN PRIOR

TO PRE-CONSTRUCTION MEETING

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SLIDE 17