Guide to Excavation Shoring Systems: How to Choose

Vertical hydraulic shores use aluminum or steel hydraulic cylinders to exert outward pressure against trench walls. Systems typically consist of vertical rails, hydraulic cylinders and plywood or aluminum sheeting that transfers soil loads into the shores.

Unlike trench boxes, which protect workers in the event of a cave-in, vertical hydraulic shores actively resist soil movement to help prevent a cave-in. They are preloaded to stabilize trench walls as excavation progresses. Installation is performed from outside the excavation, with components adjusted to match the width and soil conditions.

Advantages

• Lightweight components allow for fast, manual installation
• Actively supports trench walls by applying outward pressure
• Easily adjustable for varying trench widths
• Requires minimal equipment to install

Best Use Cases

• Shallow excavations, generally up to 12 feet
• Short-duration utility repairs and maintenance work
• Stable to moderately stable soil conditions
• Tight jobsites where speed and flexibility are critical

Modular Aluminum Panel Systems (MAPS) are lightweight trench shielding systems designed to protect workers from a cave-in if one occurs. Aluminum panels, spreaders and stacking components form a protective box within the excavation.

MAPS trench boxes are engineered for flexibility. They allow contractors to configure panel sizes and trench widths quickly. Because aluminum is much lighter than steel, these shoring systems improve jobsite mobility and reduce lifting requirements compared to steel trench boxes.

“After they were developed, MAPS shoring products saw immediate traction in the field. They quickly became a go-to solution for contractors seeking efficient, adaptable trench support systems,” said Brett Sondergard, region project developer manager, engineered products and solutions.

Advantages

• Lightweight aluminum panels simplify handling and installation
• Modular configurations accommodate a variety of trench sizes
• Fast installation, removal and relocation
• Reduced equipment demands compared to steel boxes

Best Use Cases

• Shallow to mid-depth utility trenches
• Projects with predictable soil conditions
• Jobs requiring frequent box movement
• Sites with limited lifting capacity

Steel trench boxes and manhole boxes, aka shields, are heavy-duty shielding systems designed to withstand commonly occurring earth pressures and surcharge loads. Made from welded steel panels and spreaders, they create a rigid protective structure to protect crews working within the excavation.

Steel trench boxes are typically installed using excavators and are available in a wide range of sizes to accommodate different trench depths and widths. Manhole boxes are specialized configurations designed for vertical excavations associated with manholes, vaults and similar structures.

Advantages

• High structural strength and durability
• Performs well in deeper excavations and poor soils
• Designed to handle traffic, equipment and surface surcharge loads
• Long service life in demanding environments

Best Use Cases

• Deeper utility trenches
• Roadways and congested urban jobsites
• Manhole, vault and structure installations
• Projects with significant surface loading

Sheeting and bracing is a traditional excavation shoring system that uses steel sheeting pre-driven into the soil and supported by horizontal braces or hydraulic struts. Built in the field, these systems offer a high degree of adaptability for irregular trench geometries and congested environments. Loads are transferred from the soil into the sheeting and resisted by the bracing members.

Advantages

• Highly adaptable to irregular excavation shapes
• Installed in stages as digging progresses
• Effective in mixed and variable soil conditions
• Allows access to the full trench width

Best Use Cases

• Tank, vaults and similar structures
• Excavations requiring large open spans
• Projects requiring custom layouts
• Sites where prefabricated systems are impractical

Beam and plate shoring systems use vertical steel beams, often H-piles or rails, installed at intervals along the excavation perimeter. As excavation proceeds, steel plates are inserted between the beams to retain the surrounding soil. This method provides near-continuous earth retention and helps reduce ground movement and surface settlement.

Beam and plate shoring systems can be installed using vibration, pressing or predrilling methods. They are often used in conjunction with hydraulic struts or high-load-capacity bracing systems.

Advantages

• Provides near-continuous ground support
• Reduces soil movement and settlement risk
• Adaptable to varying excavation depths and widths
• Compatible with Mega Brace and hydraulic struts

Best Use Cases

• Deeper excavations
• Poor or unstable soil conditions
• Installations near existing utilities or structures
• Projects requiring enhanced settlement control

Sheet piling is a pre-support shoring system that involves driving interlocking steel sheet piles into the ground before excavation begins. Once installed, the sheets form a continuous retaining wall capable of resisting lateral earth pressures and hydrostatic forces.

Sheet pile systems are especially effective in soft soils and high groundwater conditions. Depending on project requirements, sheet piles may be used temporarily or as part of a permanent structure and can be internally braced or tied back.

Advantages

• Continuous earth and water retention
• Excellent performance in soft soils and high groundwater
• Minimizes ground loss and settlement
• Capable of supporting very deep excavations

Best Use Cases

• Excavations below the water table
• Waterfront or high-groundwater sites
• Deep shafts and large excavation pits
• Long-term or permanent retention needs

Slide rail shoring systems provide continuous earth retention throughout excavation. Vertical rails are installed prior to excavation. Steel panels are slotted into them and advanced as digging progresses. This top-down approach significantly reduces soil movement and limits worker exposure during installation

These systems are designed for deep excavations and difficult soil conditions. They provide adaptable configurations to accommodate varying lengths, widths and site constraints.

Related: Slide Rail Shoring Systems: A Guide to Uses and Benefits

Advantages

• Continuous support minimizes soil loss
• Panels installed from the surface improve jobsite safety
• Highly effective in a variety of soil types
• Supports deep excavations without over-excavation

Best Use Cases

• Deep trenches and large-diameter structures
• Manholes, wet wells and vault installations
• Urban environments with nearby infrastructure
• Projects requiring strict settlement control

The Mega Brace, available from United Rentals, is an internal bracing solution used in conjunction with retaining walls such as sheet piling or beam and plate shoring systems. It consists of pre-manufactured lengths of waler-beam and crossing or corner struts that can be quickly pinned together to fit the length and width of the excavation. A telescoping hydraulic ram allows the system to be pumped in or out for a more precise custom fit, eliminating the need for welding or other hot works.

For wide excavations, the bracing system can be paired with high-load-capacity hydraulic struts to resist lateral earth pressures. These struts take the place of welded steel struts and offer major speed and safety advantages over weld-in-place shoring, which can be time consuming, labor intensive and dangerous.

Related: Modular Hydraulic Bracing Systems Offer Fast Excavation Shoring

Advantages

• High load capacity for wide and deep excavations
• Adjustable hydraulic support as conditions change
• Reduces internal obstructions compared to cross bracing
• Improves productivity and access within the excavation

Best Use Cases

• Large-diameter shafts and pits
• Deep excavations with wide spans
• Projects requiring crane or equipment access inside the excavation
• Complex infrastructure installations