AEX Group :: Ingeniería - Investigación

Rock anchoring system (installation and certification)

The drilling must be perpendicular to the base material.Once the bore hole is cleaned , the resin is added and the bolt introduced. The bolt and the borehole wall are bonded by the adhesion of the resin. The load is distributed along the length of the anchorage, putting less pressure on the base material. Thus,the mooring line will transmit its load to the anchor and the anchor to the rock.

It has been used in both salmon and mussel centers, especially in areas with steep slopes like in fjords.

To install anchor bolts, a visual inspection of the area must be performed, to find a suitable rock. A solid rock with the least amount of fractures is chosen and must be aligned with respect to the anchor or retention line. A bore hole is drilled with a greater diameter than the bolt to leave space for the adhesive.

Maximum holding power testing

This test is used to determine the force that a mooring line is capableof withstanding before moving the anchoring element from the position in which it was installed. This test allows us to asses the behavior of the mooring line under the maximum forces generated from extreme environmental conditions.

Holding power testing of mooring lines is used to check the holding power of the mooring elements, such as dead weight, anchors, mooring bolts and certainly mooring lines.

The ultimate goal of a holding power test is to compare the theoretical tension on a mooring line given by the mooring studies report and tensile strength measured in the field.

Security requirements are increasing and therefore resistance testing of materials should also be increased. Tensile tests of up to 50 tons ensurea high level of safety and a long service life of the products. The computer controlled testing can capture load data, time and elongation which are then used to obtain the corresponding graphs; tension time and time-deformation.

Thickness Testing

In order to calibrate thickness, AEX Group establishes a verification sample.This is done by considering a representative number of points that are distributed evenly or as requested along the plate to be tested. To achieve an effective measurement, an angle grinder is used to remove rust and layers of paint, thus measuring only the thickness of the plates. The equipment can be used to work within a range of 2-200 mm. Thickness variation, in some cases, can be due to the presence of patches made with plates of a different thicknesses from the original plate or in some areas by corrosion, in addition to the margin of error of the equipment itself (± 0.3mm).

In many applications, the first advantage offered by non-destructive testing is the ability to accurately measure the thickness of plates in situations where only one side of the part to be examined is accessible, such as pipes or tanks, or where the simple mechanical measurements are impossible or difficult to perform for different reasons, like the dimensions or the difficulty of access. The ultrasonic thickness meter can be used in virtually all industrial materials, including most metals.

Bollard pull testing

Bollard pull testing is the measurement of the amount of force that a tug is able to apply in a towing job under certain conditions.

The driving force of the propeller, depends on all of the following factors combined: the diameter and the movement of the propeller, the shaft speed and the draft of the vessel.

All Tugs, either Chilean or foreign, in order to perform a TOWING SERVICE in waters under national jurisdiction, must have a clean and valid Certificate of Driving Capability "BOLLARD-PULL" for Tugs, and all relevant safety certificates up to date.

The maritime authorities may order the mandatory use of tugs in all those ports that its use is deemed essential for the security of maneuvers. (Art. 40 of the Chilean Navigation Law)

Safe working load SWL

This formula is used to determine the safe working load of the boom installed on board a ship or vessel. The tensile measurement is carried out with a dynamometer which registers the tension during a set time and the working angle of the boom.

Mooring Systems

It is important to control the security conditions of the mooring system that holds the structure in place. Periodic inspections need to be realized based on location of the structure, size and the degree of exposure . We review the elements and components of the anchoring system considering critical points to prevent accidents from affecting the structure, escapes, or massive loss of resources from the farming system.

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