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Build-in-resin Prestressed Hollow Bolt

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Build-in-resin Prestressed Self Drilling Hollow Bolt
Build-in-resin prestressed self-drilling hollow bolt is ONTON’s new developed and patented product at the end of 2023, which is the improvement on the basis of traditional self-drilling anchor bar. It consists of more than 10 devices, in addition to the traditional self drilling anchor...

Hollow Bar Micropiles & Build-in-Resin Hollow Bolt

The build-in-resin hollow bolt can be specified for permanent works when the design includes suitable corrosion protection and inspection access. It is practical for staged construction because anchors can be installed and stressed as each lift is cut. On constrained sites, using anchors together with hollow bar micropiles reduces the footprint compared with conventional large-diameter piles. The same approach applies to brownfield projects where existing utilities restrict heavy equipment.

The build-in-resin hollow bolt is designed for fast, reliable anchoring in weak rock, fractured strata, and mixed ground. It combines self-drilling convenience with prestressing so the load is transferred uniformly into the formation. On projects that also require deep reinforcement, it pairs well with hollow bar micropiles to create a stable system for foundations and retaining works.

build-in-resin hollow bolt

Advantages and Benefits in Use

The installation sequence is straightforward, which reduces training time for new crews. Early bond development lets the contractor move to prestress sooner, avoiding long idle periods. Because the build-in-resin hollow bolt drills and bonds through the same path, it is effective in gravels, fill, weathered rock, and interfaces where conventional rebar anchors struggle. When a site adds hollow bar micropiles beneath the same structure, the anchor network and the pile network share loads more evenly. That often leads to lower differential movement and better service performance over time.

Product Advantages

Integrated resin activation: The build-in-resin hollow bolt uses resin positioned for quick mixing during installation. Bond develops rapidly, which shortens the wait before prestressing.
Consistent load transfer: Prestress is applied after curing. The system improves contact along the bonded length and reduces slip under service loads.
Fewer passes on site: Drilling and bonding occur in one sequence. Crews spend less time changing tools, which helps control labor and equipment costs.
Works where access is limited.: Hollow geometry allows flushing while drilling. The same path is then used to activate resin. This improves productivity in tunnels, galleries, and tight slopes.
Durability. : Protective coatings and proper grout cover extend service life. When projects use hollow bar micropiles alongside anchors, long-term stiffness and settlement control improve.

Operation Process

  1. Setout and selection. Confirm anchor length, bit type, and torque range based on ground data. Choose the appropriate build-in-resin hollow bolt diameter and accessories such as couplers, plates, and nuts.
  2. Drilling. Advance the hollow bar with the selected drill bit. Use air, water, or grout flushing to clear cuttings. Maintain steady feed and rotation so the bore follows the planned line.
  3. Resin activation. During final rotations, engage the resin units associated with the build-in-resin hollow bolt. Mixing starts inside the bore. Keep rotation long enough to achieve uniform distribution around the bar.
  4. Initial hold. Allow the resin to set to the specified handling strength. Do not disturb the bar during this window.
  5. Prestressing. Fit the bearing plate and nut. Apply load using the approved procedure. Record torque or jack readings as required by the method statement.
  6. Finishing and inspection. Protect exposed steel. Check alignment and document the as-built data. Where the anchor is part of a foundation package with hollow bar micropiles, verify compatibility of loads and clearances.

Application Scenarios

  • Slope and cut stabilization. Face support on highways, rail corridors, and deep excavations, especially where the face must be secured as it advances.
  • Tunneling and underground works. Crown and wall anchoring in portals, headings, and station boxes. The build-in-resin hollow bolt helps control deformation in weak ground.
  • Retaining and support of excavation. Anchors for soldier piles, sheet walls, and shotcrete liners.
  • Foundation improvement. Combined solutions with hollow bar micropiles for underpinning, seismic retrofit, machinery bases, and tower foundations where settlement limits are strict.
  • Mining and caverns. Rapid face support and localized reinforcement around openings.
how anchor bolts work

Why Ontonbolt

Ontonbolt supplies anchor bars, couplers, drill bits, plates, and accessories as a coordinated package. The build-in-resin hollow bolt range is supported with guidance on selection, torque targets, and mixing times, so site teams can keep a steady pace. When designs call for hollow bar micropiles in the same foundation, Ontonbolt provides matching components to simplify procurement and ensure fit between systems.

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