Pull-out Rubber Rod

Introduction

1. Pull-out rubber rod is a new mandrel, used for making small holes in concrete structures. It is mainly designed for making pre-stressed holes on bridge, and can be used on other concrete structures too.

2. The pull-out rubber rod is of high strength, high elasticity and incompressible. When pulled by an axial force, the rubber rod extends axially, and the actual diameter of the rod decreases at the same time.

3. The advantages of the pull-out rubber rod are as follows: easy pull-out, convenient, reusable, long service life, smooth surface, good flatness. The wall of pre-stressed holes is smooth, and the pulling-out time is not restricted by the solidification time of concrete.

Features

1. Smooth wall of the holes, accurate hole size and high precision of hole-making.

2. Economical, it can be used for more than 100 times.

3. It can be pulled out at any time after the initial solidification of the concrete.

4. It can be pulled out manually or by using hoisting machine or engineering truck.

5. It can be curled into bundles, which is easy to transport or warehouse.

Using Method

Spray liquid soap evenly on the surface of the rubber rod before using. So that the rod won’t stick to the concrete, and it is easy to be pulled out with soap as lubrication. This also increases the using times of the rubber rod.

Installation:

1) First penetrate the steel stranded wire through the inner hole of the pull-out rubber rod, protecting the rubber rod from squeezing deformation during concreting.

2) Then penetrate the soap sprayed rubber rod through the pre-stressed hole, and fix the rubber rod in the correct position by using fixing clips. The distance between each fixing clips is about 300~500mm, as long as pendency can be ensured.

3) When connecting pull-out rubber rods, use thin steel sheet or PVC pipe to wrap the two ends of rubber rod in one and a half or two circles, then tie it with steel wire, finally seal the two ends of the PVC pipe by adhesive tape, so that the mortar won’t enter.

Notes:

Please pull constantly, don’t release force, until the rubber rod is totally out.

Don’t spray oil parting agent on the surface of the pull-out rubber rod.

After using some times, please check if there is any scratch or crack on the rubber rod. If there is any axial crack, the rubber rods can still be used normally. If there is radial crack deeper than 2mm, please stop using the rubber rod.

When not in use, please keep the rubber rod from heat, sunlight and corrosive materials.

Main Performance Index

Items	Index
Appearance	No crack, no hot rubber particles, no rubber sponge on the surface; The rubber layer bubble and surface traces of impurities are not be longer than 3mm, and not deeper than 1.5mm, and the quantity is no more than one per meter. Tolerance of OD is ±4, and the deviation of roundness is less than 20%.
Hardness（Shore A, degree）	66±5
Tensile strength（Mpa）                 ≥	12
Tensile failure elongation (%)           ≥	350
300% tensile strength, Mpa             ≥	6