A new road overlay near Jourdanton or a utility extension into a development outside Poteet often means existing manholes need to be raised, lowered, or replaced to match new grade — and getting that wrong creates a maintenance problem for years. Global Contractors LLC handles manhole installation and adjustment for sewer, storm, and utility systems throughout the Pleasanton and San Antonio area, setting precast sections and adjusting rim heights so covers sit flush with finished grade. Every entry follows confined-space safety protocol, since manholes are treated as permit-required confined spaces under OSHA rules. Call (253) 606-9497 for an estimate.
What Adjusting and Installing Manholes Actually Involves
Manhole work covers two related jobs: installing a new precast structure, and adjusting an existing one to match a new road or site grade. For a new installation, Global Contractors LLC excavates to the design depth, sets a compacted base, and lowers precast concrete barrel sections and a cone or flat-top section into place, sealing each joint against groundwater and infiltration. For adjustment work — common on repaving or regrading projects — the crew removes the frame and cover, adds or removes precast riser rings to hit the new target elevation, and resets the frame level and flush. Either way, every manhole is a permit-required confined space, so entry follows atmospheric testing and confined-space protocol before anyone goes below grade. Backfill is compacted in lifts around the structure to prevent future settling, and the frame and cover are set to finished grade so there’s no lip to catch a tire or mower. Property owners and municipalities go from a manhole that’s out of grade, leaking, or unsafe to enter, to a structure that sits flush, seals properly, and is documented for the utility’s records.
Our Adjusting and Installing Manholes Process
Step 1 — Utility Locate & Excavation
We call in utility locates and excavate to the design depth around the existing or planned manhole location. This step protects buried lines nearby and confirms the actual depth matches the plan before any structure goes in or comes out.
Step 2 — Base Prep & Section Placement
For new installations, we compact a stone base and set precast barrel sections plumb and level; for adjustments, we remove the frame and add or remove riser rings to hit the target elevation. Getting the base right here is what keeps the structure from settling later.
Step 3 — Joint Sealing & Waterproofing
Every joint between precast sections gets sealed to keep groundwater and infiltration out of the sewer or storm system. This is one of the most commonly skipped steps on lower-quality work, and it’s usually why a manhole leaks within a few years.
Step 4 — Frame & Cover Setting
We set the frame and cover flush with finished grade — not proud, not sunken — so the surface reads clean and doesn’t create a hazard for vehicles or pedestrians crossing it.
Step 5 — Backfill, Compaction & Inspection
Backfill goes in and gets compacted in lifts around the structure, and we do a final check on grade and seal integrity before signing off. You get documentation for the municipality or utility’s records and a manhole built to hold grade for years.
Serving Pleasanton, TX and the Surrounding Area
Global Contractors LLC installs and adjusts manholes for municipal, utility, and private development projects throughout Atascosa County and the San Antonio metro, including sites near Jourdanton, Poteet, and along the US-281 and I-37 corridors. Much of this region’s utility work runs through sandy or clay-heavy soils that behave differently than a typical urban trench, and we account for that in base prep and backfill compaction on every structure we set. Learn more about our excavation services.
Why Pleasanton Property Owners and Developers Choose Global Contractors LLC
Manhole work is confined-space work, and Global Contractors LLC treats it that way on every job — atmospheric testing and entry protocol before anyone goes below grade, in line with OSHA’s permit-required confined space standard. That’s a standard some smaller crews skip to save time, and it’s not one we cut corners on.
This is an extension of excavation and site work the company has performed on large commercial and government projects for years, not a service bolted on without the equipment or crew to back it up. Learn more about our background on the About Us page.
Straightforward pricing, documented work, and a crew that shows up when scheduled — the same standard we hold on every job site.
Frequently Asked Questions
How do you determine how much to adjust a manhole?
We survey the new finished grade against the existing rim elevation and calculate the riser rings or excavation depth needed to bring the structure flush.
Is manhole entry dangerous?
Yes — manholes are classified as permit-required confined spaces due to risks like low oxygen or hazardous gas buildup, which is why we follow OSHA confined-space entry protocol on every job.
Can you install manholes for a new development, not just repair existing ones?
Yes, we install new precast manhole structures as part of new utility runs for development and municipal projects.
Do you work with municipal utility departments directly?
Yes, we coordinate with city and county utility staff or their general contractors on manhole projects tied to public infrastructure.
How long does a typical manhole adjustment take?
Most single-structure adjustments are completed in a day, though timing depends on depth, traffic control needs, and site access.