1.Basic structure of shuttering magnet
Basic structure of shuttering magnet
precast magnet by the box, magnet, open the bolt, adjustable bolt four parts, and the magnetic box in the 80 degrees below the maintenance of the library for a long time to use the magnetic force does not decay, stainless steel shell makes the magnetic core of the magnetic force is more centralized, in addition to the magnetic core to play a very good role in protecting the poor concrete environment does not rust.
2. precast magnets related parameters and attributes
|
name of shuttering magnet |
Maximum magnetic force |
Remark |
|
QCM Shuttering Magnet 1 |
1KN |
Common specifications on the market |
|
QCM Shuttering Magnet 2 |
12KN |
Specifications selected for this plan |
|
QCM Shuttering Magnet 3 |
35KN |
The largest specification on the market |
Shuttering magnet application scenarios
The small specification precast concrete magnet commonly used in the market is 1KN, this scheme is calculated and selected, each Magnetic shuttering vertical pressure is 12KN. precast wall production magnet prevents the template from floating through the presser foot plate pressed on the side mold, the maximum vertical pressure of precast concrete shuttering magnets is 35KN, and with the improvement of technology level, the pressure generated by shuttering magnet will be larger and larger. and with the improvement of the pressure of precast magnet, the maximum friction of precast magnet is also increased accordingly.
3. How magnet shuttering works?
Magnetic array in activated and released states of shuttering magnet
precast magnets through the lifting and lowering of the opening bolt to control whether the magnet is in working condition, when the opening bolt is pressed down, the magnet is in contact with the mold table to generate pressure, when the opening bolt is cocked, the magnet is detached from the mold table and is in a non-working state, the adjustable bolts are adjusted appropriately according to the thickness of the template presser foot plate, so as to achieve the purpose of the magnet and the template are closely connected.
4. Friction between precast concrete magnet and formwork table
shuttering magnet friction force detection
The friction of each PRECAST CONCRETE MAGNET on the mold table was measured experimentally to be 3700N, and the pressure of the magnetic cartridge was 12KN.
5. Friction between precast concrete magnet and pattern plate
Detection of friction between shuttering magnet and pattern plate
Considering that the size of the friction force is related to the pressure and the coefficient of friction of the contact surface, in order to increase the coefficient of friction of the contact surface under the condition of certain pressure, a strip pattern plate is welded on the mold table, and the precast wall production magnet is fixed on the pattern plate, and the horizontal friction force is detected to be 2,800N by the same method.
6. Friction analysis
The friction force of shuttering magnet on steel surface and pattern plate surface is different
The friction coefficient of the pattern plate is larger than the friction coefficient of the mold table, but the maximum friction of the precast concrete shuttering magnets on the pattern plate is smaller than the friction on the mold table. The reason for analyzing this may be that the contact area on the pattern plate is smaller than that on the mold table, and although the coefficient of friction increases, the distance of the magnets from the surface of the main plate of the pattern plate becomes larger, which leads to a smaller pressure. which makes the maximum friction force on the pattern plate become smaller.
7. shuttering magnet setting and formwork lateral pressure calculation
How to set up precast concrete magnet in square pile precast concrete production
Square pile single block side mold set 10 magnetic boxes, through the calculation of 20 shuttering magnets friction is 74KN, side mold square pile concrete side pressure Fmax=8Ks+24KtV1/2=8*1+24*1*0.40.5=23.1kN/m2<74KN, to meet the requirements.
8. precast concrete magnet activation and release methods
How to activate and release the shuttering magnet
precast magnet makes magnet shuttering tight by lowering the bolts to press the square pile template onto the mold table, and when removing it, you only need to gently pry the bolts with a pry bar or homemade wrench to dislodge it from the mold table and keep it disengaged.
