2015 structures congress - 2 day cycle

Coordination and Communication in a 2-Day Cycle

Ramon Gilsanz, PEJennifer Lan, PE

ASCE Structures Congress 2015

• 2-Day Cycle

• Coordination

• Communication


ProjectNew York, NY


• 32 Story Tower, 14 Story Mid-rise• 55 Apartments per Floor• 400-2500 sq. ft. per apartment• 575 feet in length

ProjectNew York, NY


• 588,000 square feet floor area• 67,000 square feet site footprint• 8” Flat Plate Slab• 5 “Core” Shear Walls, 2 Straight Walls

ProjectNew York, NY


• First documented in NYC in the 1950s

• Improved upon over time (shoring techniques, concrete mix)

• Requires competent, experienced, and specialized work force

2-Day Cycle


Concrete Mix


Day 1, AM


• Place Concrete• Finishing rebar


Day 1, PM

• Lift lumber, plywood, shoring• Begin formwork• Complete pour


Day 1, End of Day

• Formwork erection done• Column/wall rebar work starts


Day 2, AM

• Place block-outs• Place Bot. Rebar• Lay Conduits• Top bars start by mid-day


Day 2, PM

• Place Concrete at Columns and Shear Walls• Continue Setting Rebar


Day 2, End of Day• First slab section is ready for pour

Day 1


Day 2


2-Day Cycle


150 people x $900 per day per person

= $135,000 per day

Why the2-Day Cycle?


Coordination


• Electrical

• Penetrations aroundcolumns / walls

• Construction Equipment

Field Coordination


Coordination

Electrical Shop Drawings


Coordination

Electrical Closets


Coordination

Plumbing


Coordination


Coordination

Construction Equipment


Communication


What is the standard process?


• All communication between the Contractor and the Design team will be through Architect.

• No decisions or issues that have an impact on design scope, cost or schedule shall be made by a consultant.

• Once a consultant has reviewed a submittal, it shall be submitted to the architect who will consolidate comments prior to issuance of the contractor.

• RFI Responses and any accompanying information shall be issued to the Architect only. Do not broadcast a response to the Contractor/Owner unless previously agreed upon with the Architect.

Standard Communication Chain


Architect

GC

Inspector

Engineer

RFIASI

RFIASI

Reports

Scheduling Punch List

RebarConcrete

Sub

Standard Communication Chain


• What is the appropriate RFI response time for field conditions?– Instant?– Hours?– Days?

Scheduling for a 2-Day Cycle


150 people x $900 per day per person

= $135,000 per day


Scheduling for a 2-Day Cycle

What is an improved process?


Coordinating Team Industrial Facilities


• Contractor is immediately aware of what is needed– Pre-Construction Meetings– Shop Drawing Review

• Inspectors have access to engineers

• Good record keeping (daily, electronic reports)

Communication


GC+SubArchitectEngineerInspector

Japan

Working Together


GC+

Sub

Architect

Engineer

Inspector

Working Together


GC

Engineer + Inspector

ArchitectSub

Working Together


Inspector

Engineer

Architect

Working Together

GC Sub


Thank You


2015 structures congress - 2 day cycle

Engineering