Reinforcement and reinforcement work at construction work site Flashcards
Present a typical stress-strain curve for cold worked reinforcement
pg 35
Present a typical stress-strain curve for hot-rolled worked reinforcement. Name the different parts of the curve.
pg 34
What is hot-rolled reinforcement
It has been produced in a heated condition and has got its properties in this condition. The properties have not been altered after this production process.
What is cold-worked reinforcement
It is hot-rolled reinforcement that has been treated in a cold condition an by this its properties have been changed
How is the yield-stress defined for cold-worked reinforcement
the steel will be harder with a higher yield-point and a changed “stress-strain.curve” pg. 35
In connection with reinforcement on talk about three levels of prefabrication. Name these
Level 1: Reinforcement in loose bars vut and bent at the construction site
Level 2: ready cut and bent at a reinforcement shop
Level 3: Prefabricated elements- prefabricated at reinforcement shop
What is hot-bending? When is it used? For which reinforcement can it be used?
it is when the reinforcement is hot-bent and welded at site. It is hot-rolled reinforcement which has not been treated with TEMPCORE process that can be used.
What do we mean with “adaption to production” of reinforcement?
Actions at design stage with the aim to facilitate the reinforcement work at the execution stage. The aims is to improve the overall economy and the working enviornment at site.
Name 6 examples as regards adaption of reinforcement to production
- Chocie of high grade steel
- Chocie of wire-mesh instead of loose bars
- chocie of as large diameter as possiable in the range 8-16 mm
- Chocie of bending shapes
- Design with regard to prefabrication of reinforcement elements
- Design with regard to the possibility to place the reinforcement in the form
As regards reinforcement work on construction sites the planning of the physical conditions is important. Describe wha this planning should include.
- Time planning. Odering and delivery planning. The delivery times are strongly dependent on prefabrication level used.
- Planning of physical conditions. You need the right equipment.
It is important that the unloading of reinforcement at the constructions site is done proparly. Describe such a proper un-loading.
Proper hooks and lifting equipment must be used. It is important that the reinforcement or the marking labels not get deformed or damage.
As regards placing of reinforcement there are some basic rules. Name these
Reinforcement should be stored away types, dimensions, shapes etc separately som no mix up could accur. It must be prevented from getting touched with clay, snow, oils, cement-mortaretc. During wintertime the reinforcement shall be covered with tarpaulins
