8′ x 20′ Steel Road Plate – Iron Lot Trench Safety

Description

8′ x 20′ Steel Road Plate

The Iron Lot 8′ x 20′ Steel Road Plate provides temporary coverage for extended utility trenches, pavement cuts, access openings, and excavation work in streets, parking areas, industrial sites, and active construction zones.

Its 20-foot length provides extensive longitudinal coverage along compatible excavations, while the 8-foot dimension can be positioned across the opening when the required structural span, edge overlap, bearing, and support conditions are maintained. This configuration may reduce the number of shorter plates needed to cover a long utility cut.

The 8′ x 20′ road plate is available in 1-inch and 1¼-inch thicknesses. Iron Lot’s applicable tabulated data is based on HS20-44 traffic loading and minimum ASTM A36 steel with a 36 ksi yield strength.

Road-plate selection must account for more than exterior dimensions. The clear opening, direction of span, required edge overlap, plate thickness, supporting surfaces, traffic conditions, anchorage, transition ramps, and available handling equipment must all be evaluated before installation.

Key Benefits & Crew Efficiency

• Extended 20-Foot Length: Provides substantial longitudinal coverage for compatible utility trenches, pavement cuts, and excavation openings.

• 8-Foot Cross-Trench Dimension: Provides room for required bearing and edge overlap around compatible openings.

• Two Thickness Options: Available in 1-inch and 1¼-inch steel for different span, weight, and handling requirements.

• HS20-44 Design Basis: Covered by Iron Lot tabulated data for HS20-44 traffic loading when all stated installation conditions are satisfied.

• ASTM A36 Steel: Manufactured from minimum ASTM A36 steel with a specified yield strength of 36 ksi.

• Published Plate Weights: Weighs approximately 6,533 lbs at 1 inch thick or 8,167 lbs at 1¼ inches thick.

• Long-Trench Coverage: Provides more coverage along an excavation than shorter 8-foot-wide road plates.

• Reusable Temporary Coverage: Suitable for utility contractors, municipalities, public works departments, and excavation crews that regularly cover roadway and construction openings.

Product Specifications

Pricing & Logistics

Contact Iron Lot for Current Pricing and Availability

Contact us to confirm current pricing, thickness availability, order quantities, freight rates, and estimated delivery timing.

Freight & Delivery Coordination

Shipping requirements depend on plate thickness, quantity, total order weight, delivery destination, trailer configuration, and unloading arrangements.

Approximate plate weights are:

• 1-inch plate: 6,533 lbs;

• 1¼-inch plate: 8,167 lbs.

The trailer, lifting equipment, rigging, and unloading method must be rated for the selected road plate and planned handling procedure.

The 20-foot length and substantial plate weight require adequate room for loading, unloading, lifting, rotation, placement, removal, and storage. Jobsite access, trailer capacity, overhead clearance, traffic-control requirements, and equipment reach should be evaluated before delivery.

We can coordinate delivery to your contractor yard, municipal facility, equipment location, or jobsite and provide quotes for multiple road plates or mixed-equipment orders.

Target Applications

The 8′ x 20′ steel road plate is intended for temporary coverage of compatible openings where the required bearing area, edge overlap, support conditions, and traffic requirements can be maintained.

Potential applications include:

• extended water and sewer utility trenches;

• storm-drainage work;

• gas, electrical, and telecommunications excavations;

• long service-line and utility cuts;

• utility repair and replacement projects;

• roadway and infrastructure construction;

• municipal and public works repairs;

• parking-lot and industrial-site excavations;

• temporary roadway coverage;

• contractor-yard and construction-site openings;

• extended pavement cuts requiring substantial longitudinal coverage.

The 20-foot dimension generally provides coverage along the excavation, while the 8-foot dimension may be positioned across a compatible trench. Plate orientation must be selected according to the actual opening dimensions, traffic direction, supporting surfaces, and installation requirements.

Actual suitability depends on the clear opening, selected plate thickness, required overlap, stable bearing area, traffic conditions, and site-specific requirements. The plate should not be selected solely because the excavation appears smaller than its exterior dimensions.

Critical Selection & Installation Factors

Is an 8×20 Road Plate Right for Your Opening?

Road-plate selection requires more than comparing the plate dimensions with the excavation.

The correct plate depends on:

• clear trench or opening dimensions;

• direction in which the plate will span;

• required edge overlap;

• plate thickness;

• traffic type and speed;

• supporting-surface condition;

• pavement or soil stability;

• vehicle loading;

• slope;

• anchorage requirements;

• transition-ramp requirements;

• available lifting and placement equipment.

The tabulated maximum span is a structural limit. It does not automatically establish the allowable trench width for every installation.

Adequate overlap must remain beyond the excavation on all required supporting sides. The plate must also maintain positive contact with the supporting surfaces.

When the 8-foot dimension is positioned across an asphalt trench carrying traffic under 45 mph, the edge-overlap requirement allows an opening of up to approximately 6 feet. The structural span limit may reduce the permitted opening depending on plate thickness:

• 1-inch plate: maximum structural span of 4′6″;

• 1¼-inch plate: maximum structural span of 7 feet, with the required 12 inches of overlap per side limiting the opening beneath an 8-foot plate dimension to approximately 6 feet.

For asphalt traffic over 45 mph or dirt traffic under 45 mph, the required 24 inches of overlap on each side limits the opening beneath the 8-foot plate dimension to approximately 4 feet.

The 20-foot exterior length does not increase the published structural span. It provides additional coverage along the excavation, but the opening must remain within the applicable thickness, span, overlap, and support limits.

HS20-44 Loading & Maximum Span

The Iron Lot tabulated data is based on HS20-44 traffic loading.

The published maximum allowed spans are:

• 1-inch steel plate: 4′6″;

• 1¼-inch steel plate: 7′0″.

These limits apply only when the plate is installed according to the tabulated requirements and all supporting conditions are satisfied.

The maximum span does not override the minimum edge-overlap requirements. The allowable opening is controlled by whichever requirement produces the smaller permitted span.

Any opening, loading condition, plate arrangement, or installation exceeding the tabulated limits requires engineering.

The chart is based on a stable trench. Stability must be determined by the project’s Competent Person or engineer.

Edge Overlap & Traffic Conditions

The tabulated data provides the following minimum plate-sizing relationships:

• Asphalt traffic under 45 mph: trench width plus 24 inches minimum, providing 12 inches of overlap per side;

• Asphalt traffic over 45 mph: trench width plus 48 inches minimum, providing 24 inches of overlap per side;

• Dirt traffic under 45 mph: trench width plus 48 inches minimum, providing 24 inches of overlap per side.

Plates used on dirt where traffic speeds exceed 45 mph require engineering.

Plates used on asphalt or concrete where traffic speeds exceed 55 mph also require engineering.

The required overlap must be evaluated in both directions where necessary so the road plate remains fully supported around the excavation.

Placement, Support & Anchorage

Road plates must be placed with positive contact on all supporting surfaces. Voids beneath the plate can permit movement, rocking, impact loading, or excessive deflection.

Cold patch may be used to displace voids between the plate and supporting surface where appropriate.

The tabulated data states that anchorage may be required when:

• traffic speeds exceed 45 mph;

• the installation is on a slope greater than 5%;

• local requirements call for anchorage;

• the Competent Person or engineer determines that movement must be restrained.

Anchorage, recessing, welds, bolts, pins, and other installation details must be appropriate for the actual roadway and project conditions.

Transition Ramps

The tabulated installation detail calls for a minimum 18-inch cold-mix transition ramp around the road plate.

The transition helps reduce abrupt tire impact at the plate edge and provides a smoother path for traffic crossing the installation.

Ramp construction, plate recessing, signage, traffic control, inspection frequency, and maintenance requirements may vary by jurisdiction, project owner, and roadway authority.

The contractor must confirm all applicable state, local, owner, and project-specific requirements before placing the road plate into service.

Inspection & Handling

Road plates should be inspected before installation and periodically while in service.

Inspect for:

• permanent bending or deformation;

• cracks or damaged edges;

• excessive corrosion or material loss;

• damaged lifting points;

• failed welds or attachments;

• plate movement or loss of bearing;

• deteriorated transition ramps;

• voids beneath the plate;

• loose or damaged anchorage;

• changing soil or pavement conditions around the excavation.

Damaged or questionable plates should be removed from service until they have been evaluated.

Road plates should only be lifted and positioned using properly rated machinery, rigging, and lifting points. Workers must remain clear of suspended plates and pinch points during loading, unloading, placement, adjustment, and removal.

Request a Quote from Iron Lot

We supply steel road plates, trench plates, trench boxes, manhole boxes, bedding boxes, and other equipment for underground utility and excavation contractors.

Contact our team for:

• current pricing and availability;

• 1-inch and 1¼-inch plate options;

• additional road-plate sizes;

• multiple-plate quotes;

• available fabrication options;

• freight and delivery coordination;

• trench-safety equipment;

• equipment financing information.

Get a Quote

Warehouse Shipping Locations: Multiple Locations

Payment Options:

We accept company check, wire transfer, ACH, and credit card payments. We also offer financing through Ascentium Capital.

Financing: Ascentium Capital offers fast and flexible financing. With their quick and convenient way to purchase equipment, working with Ascentium Capital helps you acquire the funds you need for your equipment purchase. With financing and leasing of up to $2,000,000, Ascentium Capital works with you to make the application process simple and at no obligation.

To learn more about Ascentium Capital and how it can assist you, click image below:

Call Iron Lot at 336-516-8011 or request a quote online for current pricing, availability, and freight information.

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