It was in fact a revolutionary new DYNAMIC BOLTING FASTENER, hence the brand name "DYNABOLTTM" which is a registered trade mark of RAMSETTM FASTENERS.
‘DYNABOLTTM" now sets new standards for the performance of a high volume sleeve anchor.
Simply, the DynaboltTM is a major step forward in expansion anchor technology and is the first “sleeve type” expansion anchor to offer the combined advantages of a secure fixing, with a controlled and powerful “pull down” feature, which makes DynaboltTM suitable for a wide variety of applications.
- Cleaning the hole
- Correct insertion of the capsule
- Special adaptors and machines to set the stud bolt under rotary hammering action to ensure proper mixing of the components.
- Observation of cure times before applying the load.
Clamp Down Capacity
WHAT IS DYNABOLTTM?
- A TAPERED END, threaded bolt.
- AN OUTER EXPANSION SLEEVE, depending on the length it may also be supplied with spacer sleeves.
- A FLANGED hexagon nut or post screw of the countersunk, flat head, round head, flush head type.
- Other special types Hook Bolt, Eye Bolt, etc.
The tapered end of the bolt is cold formed on conventional cold heading machines, it is then cut off to length and the thread is rolled onto the top of the bolt.
The expansion sleeve is stamped from flat strip and must only be fitted onto the bolt one way, the three slotted end of the sleeve must rest down on the tapered end of the bolt to enable expansion to take place when drawing the tapered end of the bolt upwards into the expansion sleeve. The flanged nut types are standard components that are fitted above the expansion sleeve and are screwed together by finger pressure only.
Applications can be changed. It could be that the correct fastening done by Powder Actuated Tools could be a much quicker and cheaper proposition on an in-place cost basis.
The high cost of labour is a most important factor when considering alternatives to a P.A.T. Fastening.
In the main, DYNABOLTTM anchors are used where any or all of the following factors are considered important:
- Higher capacity than P.A. Fasteners.
- A removable fixture.
- Neatness of fastening every time.
- Through fastening giving accurate fixing every time.
- Because the base material is too hard or brittle for P.A.T.(i.e. granite, rock, bluestone, solid or wire-cut bricks, etc.)
The DYNABOLTTM does not rely on the bottom of the hole to achieve expansion. During the tightening up process the tapered end of the bolt is drawn upwards into the expansion sleeve thus forcing the bottom of the sleeve outward giving a positive 360 degree expansion against the side of the drilled hole.
The more you tighten the nut down on the top of the DYNABOLTTM the more you will draw the tapered end of the bolt up through the expansion sleeve. By over tightening the nut the only effect you will have is to draw more thread up through the nut until the bolt snaps or the thread strips.
When torquing up (tightening) DYNABOLTTM, a good rule of thumb is to tighten the nut 3 to 4 full turns. Refer to the RamsetTM TECHNICAL MANUAL for correct torque information.
DRILLING THE HOLE IN MASONRY
When drilling the hole into masonry you should always think of the total system concept that we have, when using RamsetTM. We supply the correct drilling machine (DynaDrillTM Rotary Hammers) and we have the correct size tungsten/carbide tipped masonry drill bits. By promoting and using the total fastening system you will ensure that our anchors will give optimum performance.
You should always drill the hole equal to or greater than the required embedment of the DYNABOLTTM.
Many applications call for drilling into base materials, a masonry drill will not remove all of the clippings and dust (commonly called swarf) from the hole and unless you have completely cleaned out the hole, the DYNABOLTTM could come to rest on this swarf and prevent the anchor from pulling down neatly onto the material to be fastened.