Bunney’s Inc. designs and builds underground duct bank systems for power, fiber, and telecommunications across Arizona. From trenching and spacers to concrete encasement, vaults/handholes, and full surface restoration, we deliver code-compliant corridors that are durable, maintainable, and built to your utility or AHJ standards.
New to Bunney’s? Learn who we are and explore our capabilities.
Why Choose Bunney’s Inc.
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Arizona-ready execution: Methods tuned for heat, dust, caliche/hardpan soils, and monsoon logistics.
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Safety & compliance: Work aligned with our Safety program and the controlling utility/agency requirements.
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End-to-end delivery: Utility locates/daylighting, trenching & shoring, conduit banks with spacers, concrete encasement, vaults/handholes, bedding/backfill or CLSM, and paving/concrete flatwork restoration.
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Tight coordination: We team seamlessly with owner utilities, EC/telecom partners, and HDD crews; see Hydro Excavation and Potholing (Utility Daylighting).
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Documented quality: Density tests, mandrel/proofing, pull-string verification, and as-built/photo closeouts.
What We Build
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Power & telecom duct banks – Multi-conduit banks with spacers and thermal/clearance separation per spec.
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Service laterals & risers – ROW to building, equipment pads, or gear line-ups.
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Vaults & handholes – Traffic-rated structures, bases, drainage/weep details, and grade coordination.
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Campus & street corridors – Public ROW, substations, data centers, industrial parks, and municipal sites.
How Duct Banks Work
Duct banks play a crucial role in underground infrastructure, providing a secure channel for utility wires such as electrical and telecommunications cables. They not only protect cables from external damages but also facilitate easy maintenance and future upgrades. By housing cables within these conduits, duct banks prevent them from touching each other, reducing maintenance needs and enhancing the organization of the cables based on their purposes or destinations.
Need post-install touch-ups? Our facility maintenance services cover settlement repairs, lid resets, sealants, and periodic inspections.
Materials & Methods (Matched to Your Specs)
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Conduit types: PVC (Sch 40/80), HDPE (fused/pulled), or steel/galvanized where required.
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Spacers & separation: Maintain geometry for ampacity, cooling, and mechanical protection.
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Concrete encasement: Proper cover and consolidation around spacers; mix and strength per detail.
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Bedding & backfill: Washed sand/shading around conduit; select/native fill or CLSM (flowable fill) for rapid reinstatement; lift-by-lift compaction to target density.
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Identification: Warning tape, tracer wire (when specified), labeling, and pull lines for future cable installation.
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Proofing & testing: Mandrel/ball testing, pull-string verification, and continuity checks with documented results.
Our Process
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Pre-task planning – Utility locates, traffic control, soil classification, and staging/laydown.
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Daylighting & trenching – Non-destructive exposures near conflicts; shoring/benching or trench shields to suit depth and soils.
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Bank assembly – Spacers, sweeps, expansion joints, and transitions; set vaults/handholes and verify elevations.
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Encasement & backfill – Place and consolidate encasement; bedding and lifts or CLSM per section; restore surfaces.
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QA/QC & closeout – Density reports, tests, photos, redlines/as-builts, and O&M guidance where needed.
Arizona-Specific Considerations
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Caliche & hardpan: Moisture conditioning and correct compaction energy to achieve density.
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Monsoon readiness: Temporary drainage, BMPs for erosion/sediment control, and lane reopening plans.
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Heat & UV: Material handling and sealants suited for high temperatures; schedule for safe crew productivity.
FAQs
What determines duct bank depth and separation?
Depths, clearances, and geometry follow the authority having jurisdiction and utility/telecom standards for your corridor. We confirm and document requirements in submittals before work begins.
Do you install handholes and vaults as part of the bank?
Yes. We set and grade structures, provide base and drainage details, and coordinate lids/frames to the traffic rating and finished surface.
When is concrete encasement required?
Encasement is typically specified for mechanical protection, load capacity, or thermal performance. We place the required cover and consolidate around spacers to match your detail.
Can you accelerate lane reopening after trenching?
Often, yes. Where allowed, we use CLSM and phased paving/mill-and-overlay to shorten closure windows while meeting agency standards.
Do you coordinate with HDD (directional drilling) contractors?
We daylight conflicts, verify bore paths, set structures, and tie HDD segments into open-cut sections for a continuous system.
Other excavation services: utility trenches, berm work, spillway repairs, rain spillways, dust control, vacuum excavation, erosion control, duct bank, conduit excavation, hydro excavation, trench backfilling.
