Payab Zamzam Group - Pullout Device

A pullout device is an assembly by which a grouted bolt or anchor is pulled out. This is done to either design the required bond length of the bolt system or to check the correctness of the installation procedure by the contractor. The generality of the testing is as follows:

putting a seat on the installed rock bolt
putting the hollow ram hydraulic jack on the bolt
putting the top plate and fastening the nut
attaching the jack to the hydraulic pump and pressurising the jack
If the load-displacement graph is needed, the axial displacement of the bolt is recorded by a dial gauge and the load on the bolt is recorded by a pressure gauge.

Since the bolts installed in different projects have varieties of capacities, pullout systems are also manufactured with different capacities. All of the parts (apart from standard hydraulic components which are American products) are manufactured in our machine shop.

An example with differnt stages of setup is depicted in the following pictures:

The first stage is to fasten the coupling to the bolt

Then the pulling rod is attached to the coupling.

The hydraulic jack is put on top of the seat.

After tightening the nut, the setup is complete and hydraulic pump is connected to the jack. pressurizing the jack continues till the bolt is loaded up to the test load.

A dial gauge sitting on a separate tripod is sometimes used to record the axial displacement of the bolt while loading. This information helps the designer to decide on the bolting pattern according to the bond capacity that is obtained during pullout test.

Applications

In tunnelling and underground support projects

In reinforcing trenches and open pit walls

For tightening bolts to a certain amount for industrial applications

Special Features

Robust but light deign

Different ranges of capacity (from 20 - 200 tones)

Quick setup time using versatile connections and pieces

Large range of stroke for the jacks and gauges

Special Specifications

The most requested ranges of the pullout system is usually 30 tonnes or 60 tonnes capacity the characteristic of which is shown in the following table. Production of other specifications (such as different capacity or stroke length) is feasible upon request.

Model:	pull30	pull60
Stroke Range	60-150 mm	75-150 mm
Capacity of the jack	300 kN	600 kN
Diameter of bolt	up to 32 mm	up to 50 mm
Weight of the pullout assembly	22 kg	37 kg
Hose Length	1.8 to 6 meters	1.5 to 6 meters

Required Information For Ordering

Required capacity for the jack

Diameter of the bolt to be pulled

Type of the bolt thread (or a sample of the threaded bolt)

Necessity of the bolt displacement measurement or just load measurement

Length of the hose