MAC ANGLETIE

 

THE PROBLEM

Corrosion of ties or restraining systems is not unique to low rise buildings.The problem is also seen on high rise buildings where the goalpost links or other fixings restraining cladding panels have failed. Many of the ties were of a type of bronze material which is susceptible to stress corrosion and oxidization and others were incorrectly bonded into the concrete. Serious tie failures have occurred.
It is not feasible to as certain the true state of the existing ties, and therefore, it is essential to re-secure every panel.This must be done without disturbing the occupants.

THE SOLUTION

The MAC ANGLETIE was designed to solve this problem and utilises the well proven Mac expander as its fixing system.
The principle is to eliminate bending stress by angling the anchor upwards at 450 so that the panel and wind suction forces are resisted by tension in the tie. Far fewer ties with much smaller diameter holes results from this principle.
The Mac Angletie has as 8mm diameter rod and all steel components used are of A2, 300 series austenitic stainless steel.

ANGLETIE THEORY

In a traditional solution remedial anchors would be inserted horizontally through holes drilled from the outside into the inner load bearing wall. However, due to the insulation space, the anchor suffers from high bending stress at X.

 THE BENEFITS

  • Corrosion resistant
  • Less ties needed
  • 12mm hole - economical to install
  • Low radial forces
  • Minimal noise and disturbance
  • Neat finish appearance
  • Low crushing load on panel
  • Manufactured to BS EN ISO 9000
  • Low deflection on panel
  • Fire resistant
TECHNICAL INFORMATION

SPECIFICATIONS:

Material A2, 300 series,
Austenitic Stainless
Steel Expanders
12mm diameter
Thread diameter of Rod M8

ACCESSORIES:

MS8ST Threaded Setting Tool
TB250 Pres-set Torque Wrench

TORQUE SETTING:
2ONm (151b.ft)

NOTE:
Drill bits to conform to DIN 8035
TRADITIONAL SOLUTION

Bending stress at X =

W= panel weight e.g. lOkN
L = distance from X in mm
Z = section modulus (mm3)

Assuming 12mm dia anchor Z = 200mm3
L is typically 63mm so bending stress
l0,000 x 63 = 3150 N/mm2
Allowable maximum stress in steel fixing, say I 40N/mm2
Number of fixings required
3150
140

SPACING DATA
The position and quantity of Angle Ties or Truss Bolt Systems will depend on a variety of factors such as:
PANEL, LENGTH, HEIGHT, THICKNESS, WINDOWS AND WIND LOADING ON PANEL.
For futher information and technical support contact our Technical Department.