Tubular Bolt Manufacturer: Installation Requirements and Construction Steps for Tubular Bolts

Installation Requirements for Pipe Spacing Anchors:

When installing reinforced concrete anchor bolts, there are generally two types of construction methods: grouting first and then anchoring, or anchoring first and then grouting. The grouting-first method requires special attention to grouting leakage quality during installation, while the anchoring-first method focuses on grouting venting issues to prevent insufficiently filled mortar, which can directly lead to poor anchoring effectiveness. For resin anchor bolts, it is typically necessary to use a rod to deliver the charge to the bottom of the hole, puncture it, and mix for 30 seconds to secure the rod. After 15 minutes, the resin cures to 80% to 90% of its strength, allowing for the installation of the pad plate. Resin anchor bolts can still be used in low temperatures and when there is flowing water in the hole (180~390ml/min).

Pre-stressed anchor rod installation: After the anchor head inside the anchor rod is anchored, the outer anchor end is tensioned using a jack, applying approximately 10 tons of pre-tension force to each anchor rod. Secure the bolt at the end of the rod body with a washer, and fully灌浆 with cement mortar.

Construction Steps for Bolt Hole Drilling in Tube Seams:

(1) Hole Placement: Holes should be drilled and marked according to design requirements and rock conditions, with deviations not exceeding 20 cm.

(2) Anchor Rod Hole Diameter: The hole diameter for mortar-anchored rods should be larger than the diameter of the anchor rod body by 15mm.

Drilling Direction: The anchor rod holes should be drilled radially along the tunnel perimeter, but the drilling should not be parallel to the rock surface.

Drilling Depth: The depth tolerance of mortar anchor holes should not exceed ±10 cm.

Anchor bolt holes should remain straight.

Prior to grouting, hole cleaning is essential: the presence of residual water, rock dust, debris, or other foreign matter in the drilled holes can affect grouting quality and hinder the insertion of anchor bars, thereby impacting the anchoring effect. Therefore, before installing anchor bars, it is necessary to manually or with high-pressure air/water remove accumulated water, rock dust, debris, and other foreign matter from within the holes.