Description
4′ x 20′ ESC TSB4 Steel Trench Box
The ESC TSB4-420 is a versatile mainline trench shield built for underground utility, pipeline, municipal, and infrastructure projects. The 4-foot-tall configuration can be used as a standalone trench box or as an extension shield stacked on top of a compatible taller trench box using connecting stacking pins.
A 20-foot long trench box is typically used with pipe sections that are up to 16 feet long. As a general safety rule it is recommended that a trench shield be at least 4 feet longer than the pipe being installed.
Following this rule provides additional shield length beyond the pipe section and gives the crew more working room for installation and connection work inside the protected area.
Key Benefits & Crew Efficiency
- Ideal for 16-Foot Pipe: Meets the 4-foot safety headroom rule (shield should be 4 feet longer than the pipe joint) to safely accommodate your crew.
- Standalone or Stackable Configuration: Use the 4-foot box on its own or as an extension shield stacked above a compatible taller trench box using connecting stacking pins.
- Maximized Working Length: The TSB4-420 offers 18 inches of pipe clearance and 17′11″ between spreaders.
- Capacity Safety: Built with a 1,053 PSF shield capacity for a C60 soil depth rating of 18′ and a C80 soil depth rating of 14′.
- 4-Inch-Wall Steel Construction: Weighing approximately 5,730 lbs without spreaders, this configuration combines a 20-foot working length with the versatility of a lower-profile 4-foot shield.
Product Specifications
| Model | TSB4-420 |
|---|---|
| Dimensions | 4′ High x 20′ Long |
| Wall Thickness | 4 Inches |
| Material | Steel |
| Weight | Approx. 5,730 lbs |
| Pipe Clearance | 18 Inches |
| Length Between Spreaders | 17′11″ |
| Shield Capacity | 1,053 PSF |
| Max Depth Rating – B45 | 24 ft |
| Max Depth Rating – C60 | 18 ft |
| Max Depth Rating – C80 | 14 ft |
Pricing & Logistics
Price: $12,525.00
Contact us to confirm current pricing, availability and shipping rates.
Freight & Delivery Coordination
Shipping rates are calculated based on equipment quantity, spreader configuration, and your final jobsite or yard destination. Discounts may be available for multiple box orders or complete fleet packages.
Target Applications
The 4′ x 20′ TSB4 is well suited for underground construction and mainline excavation work, including:
- water and sewer mainline installation;
- storm drainage projects;
- pipeline construction;
- municipal infrastructure;
- public works excavation;
- roadway utility installation;
- standalone use where a 4-foot shield height is appropriate;
- stacked configurations requiring additional shield height above a taller base box.
The 4-foot panel height gives contractors additional flexibility when building a trench box fleet. It can serve as a standalone box for suitable excavation conditions or be paired with a compatible taller box when a stacked shield configuration is needed.
Critical Selection & Safety Factors
Is the 4×20 TSB4 Right for Your Jobsite?
Trench box selection involves more than choosing a height and length.
The right box depends on excavation depth, trench width, pipe diameter, soil classification, surcharge conditions, groundwater, adjacent structures, excavator capacity, transportation requirements, and jobsite access.
The 4×20 TSB4 is worth considering when the project requires the working length of a 20-foot mainline box but does not require a taller standalone shield. It is also a practical fleet option for contractors who want the flexibility to use the box as an extension shield above compatible 8-foot or 10-foot trench boxes.
When used as part of a stacked system, the box should be connected with the appropriate stacking pins and the complete configuration must be evaluated according to the applicable tabulated data and jobsite conditions.
For projects requiring more standalone shield height, an 8-foot or taller trench box may be a better fit.
We can help you compare available trench box sizes and configurations based on your project requirements, equipment, transportation needs, and preferred working dimensions.
Depth Ratings & Tabulated Data
The listed depth ratings must be evaluated together with the applicable tabulated data and actual jobsite conditions.
The Competent Person on-site holds ultimate responsibility for monitoring soil classifications (A, B, or C), accounting for adjacent structures, managing groundwater, and calculating surcharge loads (such as spoil piles or heavy machinery parked near the edge of the trench).
For stacked trench box configurations, the complete system arrangement, box compatibility, stacking connections, and applicable tabulated data must also be considered.
For help comparing available trench box options, contact our team with your project details and equipment requirements.
Spreader Configurations
The correct spreader configuration depends on the required trench width, pipe or structure dimensions, installation method, and the amount of working clearance needed inside the trench box.
When requesting a quote, send us the project information needed to evaluate available configuration options, including:
- excavation depth;
- soil classification;
- required trench width;
- pipe or structure dimensions;
- standalone or stacked use;
- project location;
- quantity of trench boxes required.
We can help with spreader options, stacking pins and configuration requirements, current availability, equipment quotes, and freight and delivery coordination.
Request a Quote from Iron Lot
Iron Lot supplies trench boxes and trench safety equipment to underground utility contractors, excavation contractors, pipeline contractors, municipalities, public works departments, and other construction equipment buyers.
Contact our team for:
- current pricing and availability;
- spreader options;
- stacking pins and stacked configuration requirements;
- multiple-unit quotes;
- freight and delivery coordination;
- comparison with other ESC TSB4 sizes;
- steel and aluminum trench box options;
- equipment financing information.
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:
