00253.03 215 Section 00253 - Temporary Work Access and Containment Description
00253.00 Scope - This Work consists of d esigning, installing, maintaining, moving, and removing
systems for: Temporary access to the W ork via work Bridge s, platforms, scaffolding, and barges. Containment for all dust, debris and waste materials generated by the Work . Protection of work surfaces from weather. Heating and ventilating to maintain specified humidity, temperature, and air flow.
00253.01 General - Install all necessary work platforms and containment Structure s before
beginning Work in any area that requires them. Do not remove work platforms and containment Structure s in an area until all Work in that area has been accepted by the Engineer. Collect and dispose of accumulations of debris and waste before disassembl ing or moving a w ork platform or containment.
00253.02 Definitions:
Basic Wind Speed - Three- second gust speed at 33 feet above ground in open terrain with scattered obstructions not over 30 feet high. Dead Load - Self-weight of a Structure, such as a work platform, scaffolding, and containment. Factor of Safety - Component ultimate failure load divided by the maximum working load combination applied to the component. Fundamental Frequency - Lowest natural frequency of vibration for a Structure, measured in Hz. Live Load - The weight of personnel, E quipment, Materials, debris, and vehicles. Point Load - A force applied to a Structure at a single point. Projected Area - The area of a Structure exposed to the wind. For winds parallel to the Roadway, the Projected Area of containment is the width of the containment multiplied by its height. For winds transverse to the R oadway, Projected Area is the length of the containment multiplied by its height. Span - A sectio n of Bridge superstructure between piers. Wind Load - Forces imparted on a Structure, such as a Bridge or containment, by wind pressure and structural dynamic response to wind.
00253.03 Submittals -
a.Work Access Submittals - Submit all specified stamped drawings, specifications and design calculations for work plat forms, work bridges, trestles, or scaffolding according to 00150.35 at least 21 Calendar Days prior to the installation of work access systems(s). When work access system subm ittal is segmented, include loading from previously accepted segments in the calculations. 00253.03 216 Submit the following: Stamped design calculations assuring that the Bridge structural members can safely resist the combined effects of D ead Loads, Live Loads, and Wind Loads Stamped work access specifications and design calculations Stamped Working Drawings clearly defining the following: • Work platform, scaffolding, and containment system Dead Load (in pounds and pounds per square foot) • Maximum allowable accumulations of collected debris or water (inches depth) allowed in conjunction with all personnel, construction vehicles, Equipment, Material, and other simultaneous loading • Maximum allowable personnel, construction vehicles, Equipment, Material, and oth er simultaneous loading • Maximum wind speed at which work access structure(s) may remain on the Structure • Dimensional limits and loading limits that satisfy the conditions listed in 00253.09 for exemption from design calculations for the Bridge structural m embers.
b.Work Containment Submittals - Submit all specified stamped drawings, specifications and design calculations for containment and access, systems according to 00150.35 at least 21 Calendar Days prior to the installation of work access system(s) . Submit the following: Stamped containment Working Drawings, specifications and design calculations. Maximum wind speed at which containment wall materials may remain on the Structure. A view showing the location(s), and magnitude(s) of containment syst em reactions that are applied to the supporting structure. Appropriate submittals for access Structure(s), barge, or other information critical to the function of the containment system.
c.Heating and Ventilating Submittals - Submit all specified stamped drawings, specifications and design calculations for heating and ventilating systems according to 00150.35 at least 21 Calendar Days prior to the installation of heating and ventilating systems(s). Submit the following: Stamped heating and ventilating Working Drawings, specifications and design calculations. Include in the Working Drawings: • A view showing the size (length by width by height) and location of each containment to be used, • Heating and air moving equipment (manufacturer, model , and capacity in cubic feet per minute), for each containment.
d.Barge Submittals - Submit all specified stamped drawings, specifications and design calculations for barges, floats, and rafts supporting work according to 00150.35 at least 21 Calendar Days prior to the use of Barge(s). Submit the following: Stamped barge plans detailing: • Equipment layout, 00253.05 217 • operational limitations including: storm surge, water levels, and wind speeds, • spuds, anchorages and Equipment anchorages, Stamped calculations incl uding: • barge load capacity, • balance and stability, • strength of spuds and anchorages, and • strength of Equipment anchorage Specifications describing how barges are kept within safe load and balance/stability limits, and Narrative detailing how the outfitting, operation, and maintenance of the barges comply with the following: • operational, safety and environmental requirements according to 00290.30 • United States Coast Guard requirements
e.Loads Placed on Structure Roadway, Shoulders, and Sidewalks - Submit all specified stamped drawings, specifications and design calculations for loads placed on Structure Roadway, Shoulders, and sidewalks according to 00150.35 at least 21 Calendar Days before construction loading is placed on the structure. Submit the following: Stamped calculations for Equipment, vehicles, and supplies placed in a closed lane according to the Special Provisions
00253.04 Design Services - Provide structural design services by a Civil or Structural Engineer
licensed in the State of O regon. Provide heating and ventilating design services by a Mechanical Engineer licensed in the State of Oregon. If barges will be used, provide marine design services by an engineer licensed in the State of Oregon to practice in the field of Naval Archi tecture and Marine Engineering or other Professional Engineer licensed in the State of Oregon with relevant naval architecture experience as accepted by the Engineer.
00253.05 Containment Requirements - Contain work debris that is generated from dry abr asive
blasting and arc spray metallizing operations according to the Class 1A requirements of SSPC -Guide 6, with the following limits: Type A1 rigid containment material with Type C1 rigid support structure in locations adjacent to traffic. Type A1 rigid containment floor decking. Type A2 flexible containment materials are acceptable if rigid containment materials are not specified. Provide flexible containment materials that are air impenetrable and have tear strength of at least 200 pounds per foot and tensile strength of at least 300 pounds per foot. Type H1 instrument verification of air pressure in rigid containment, provide negative pressure at least 0.03 inch water column. Type H2 visual verification of air pressure in flexible containment. 00253.06 Type I1 minimum specified air mov ement 100 feet per minute cross draft or 80 feet per minute downdraft past work surfaces. Use portable fans as needed to provide air movement in stagnant areas. Type J1 exhaust air filtration with 99 percent c leaning efficiency for particulate diameters above 39 microinches and less than two grains of particulate per 1,000 cubic feet of exhaust air (or air recycled to the work area). Provide a muffler or pressure relief valve for air handling/cleaning system. Operate dust collection, air flow, and air movement Equipment during blowdown and vacuuming to prevent settling of dust on the Structure or within the containment Structure . Contain work debris that is generated from water jet operations according to the Class 2W requirements of SSPC -Guide 6, with the following limits: Type A1 rigid containment material with Type C1 rigid support structure in locations adjacent to traffic. Type A1 rigid containment floor decking. Type A2 flexible containment materials are acceptable if rigid containment materials are not specified. Provide flexible containment materials that are water impenetrable and hav e tear strength of at least 200 pounds per foot and tensile strength of at least 300 pounds per foot. Ceiling not r equired. Provide adequate wall height to effectively prevent loss of contaminated water. Contain work debris that is generated from hand tool or power tool operations according to the Class 1P requirements of SSPC -Guide 6. For hand tool cleaning or vacuu m shrouded power tool cleaning, ground covers or free-hanging tarpaulins are an acceptable alternate means of containment provided the debris is captured and control led to the same degree as Class 1P. Immediately address any visible emissions from contain ment systems. When field painting over a body of water with brushes, rollers, or daubers, contain paint drips with rigid containment floor decking or free- hanging tarpaulins, provided that the tarpaulins capture and control paint drips to the same degree as the Class 1P c ontainment requirements of SSPC -Guide 6. When field painting over a body of water with air spray (conventional) or airless spray, contain painting operations according to Class 1A requirements of SSPC -Guide 6. Comply with the requirement s of 00290.30.
00253.06 Barge Requirements - Provide barges meeting the following requirements:
a.Operational Requirements: Provide evidence that barges have been inspected and cleaned according to Section 00290 and are in acceptable condition at t he time of use on the Project. Anchor the barges using a minimum of two spuds or a four -point anchorage system. Provide spuds or anchorages with adequate strength to resist expected tidal and weather conditions. Provide anchorages able to adjust to the highest and lowest tidal or river elevations without imparting vertical force either upward or downward to the barges. Do not allow the barges to ground at any time. Operate the barges according to applicable maritime regulations, including removal of the barges to dock in a safe location if required to avoid extreme weather hazards. 00253.08 Have a working bilge pump and backup bilge pump on each barge at all times. Anchor all equipment to barge decks. Adjust ballast to maintain proper balance of loaded barges. Do not load barges beyond their safe load capacity. Secure hatches in the closed position except during inspections or transfer of ballast. Comply with all applicable U.S. Coast Guard (USCG) regulations, including, but not limited to, mariner lighting standards. Contact USCG at (206) 220-7285 for applicable regulations.
b.Safety Requirements: Have a motorized boat available at all times. Provide a USCG approved personal flotation device for each person on board a barge. Provide USCG approved ring life buoys on each barge. Provide USCG approved “B” type fire extinguishers on each barge. Equip all gasoline engines with an acceptable means of backfire flame control. Provide adequate ventilation for fuel tanks and engine compartments for all gasoline, CNG, propane, or butane powered Equipment, adequate to remove hazardous gases from the fuel tank compartment and engine compartment. Use bonded fuel hoses during refueling to minimize the risk of sparking due to static electricity.
00253.07 Work Bridge Structural Design Requirements - Design work bridges according to
AASHTO Guide Design Specifications for Bridge Temporary Works. Provide Materials for temporary work bridges meeting the requirements of the applicable Sections of Part 00500. Comply with all requirements of applicable permitting agencies according to Section 00290.
00253.08 Work Platform and Scaffold Design Requirements:
a.Contractor-Designed - For Contractor-designed work platforms and scaffolding, provide stamped Working Drawings and stamped calculations of the work platforms or scaffolding according to 00150.35. Include the following information: All general notes for the design and construction of the platform or scaffolding. Material list including Incidental items. Show layout of work access in relation to the existing Structure, drainage system and utilities. Detail the anchoring system that will be used to connect the temporary platform or scaffolding to the existing Structure. Show all structure and geometric details including, but not limited to: • Loading conditions. • Connecting devices. • Construction around utilities, drainage, footings, bents, or other Structures.
b.Pre-Engineered - Pre-engineered assemblies may be utilized for all or for portions of work platforms or scaffolding. Submit manufacturer's literature indicating safe working loads. Working Drawings and calculations for pre-engineered assemblies are not required. 00253.10 Materials
00253.10 Material Requirements - Provide work platforms and containment systems constructed of
durable Materials capable of meeting all performance requirements throughout the Project. Previously used materials and components are not allowed if they are bent, buckled, perforated, cut, corroded with section loss, ripped, or torn; or their usability is otherwise compromised. Construction
00253.40 General - Install work bridges, work platforms or scaffolding, and containment Structures
so they contain all rubble and debris. Do not allow rubble or debris to fall into waterways. Install work Bridges, work platforms or scaffolding, and containment Structures so they satisfy all the requirements of applicable permitting agencies. For movable Structures, provide positive restraint to prevent movement except when containment structures are being relocated.
00253.41 Traffic Clearance - Maintain all traffic clearances shown. Do not allow the containment
system or cables, hoses, supplies, and Equipment to encroach on the indicated traffic clearances at any time. Provide a minimum of 7 feet of vertical clearance above pedestrian walkways.
00253.42 Safety Requirements - Comply with all applicable requirements of OSHA.
Follow approved procedures for evacuating and securing work platforms and containment systems if wind speeds or predicted wind speeds exceed design limits. For concrete removal and repair work, comply with all applicable requirements of OSHA Standard Number 1926.1153, Respirable Crystalline Silica, including Table 1. Vent exhaust gases to the exterior of containment systems. Draw air for combustion from outside the containment system. Take makeup air for the containment system from a location that ensures combustion gases are not returned inside the enclosure. Remove accumulations of debris and drift from work bridge piles and bridge piers.
00253.45 Navigation Lighting - Place flashing lights under the containment system on all four
corners of each installation according to Federal regulations, marking the reduced navigational clearance. Maintain all navigation lights in operational condition at all times during the Project and temporarily relocate them, if necessary, in order for them to remain visible to marine traffic. Mark each work platform with flashing yellow lights along the outside edge at 100 foot intervals. Mark each work platform from the outer end near the navigation channel to the first set of pilings near the bank. Flashing yellow lights shall be visible to boat traffic from either side of the platform. Flashing yellow lights may be equivalent to flashing yellow lights on construction barricades. Temporary
00253.50 Electrical Service - Install and remove any temporary electrical service needed to perform
the Work of this Section using electricians meeting the requirements of 00960.30.
00253.51 Deck and Expansion Joint Sealing - In the event of water leakage through the deck or
expansion joints, install temporary deck or expansion joint seals to prevent water intrusion into containment, using approved Materials from the QPL. 00253.90 Maintenance
00253.60 Work Bridges, Work Platforms, Barges, and Containment - Maintain work bridges,
work platforms, barges, and containment in a safe and functional condition. Where a work bridge or work platform is adjacent to Public Traffic, including pedestrian traffic, provide and place suitable approved barriers to prevent public access. Finishing and Cleaning Up
00253.70 Work Bridge Removal - When temporary work bridges are no longer needed, remove
them according to Section 00310. Satisfy all requirements of applicable permitting agencies during work bridge or trestle removal. Restore all areas occupied by the work bridges or trestles to original condition.
00253.71 Work Platform and Containment Structure Removal - When attachments for work
platforms and containment Structures are removed from the Bridge, restore points of attachment to original condition and perform touch up of Project Work so that the points of attachment match the surrounding surfaces. Measurement
00253.80 Measurement - No measurement of quantities will be made for Work performed under this
Section. Payment
00253.90 Payment - The accepted quantities of work access and containment, including temporary
work bridges, barges, work platforms, scaffolding, containment Structures, and heating and ventilation will be paid for at the Contract Lump Sum amount for the item “Temporary Work Access and Containment”. Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment, labor, and Incidentals necessary to complete the Work as specified. No separate or additional payment will be made for designing, installing, maintaining, and removing work access and containment, including temporary work bridges, barges, work platforms, scaffolding, containment Structures, heating and ventilation, or restoring the existing Structure. No payment will be made for Materials on hand. Payment for Work under this Section will be limited to 90 percent of the lump sum amount until satisfactory removal of the temporary work access and containment Materials and Equipment is complete. 00270.00
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 281–287 of 1,268. View official source ↗