Application of Shuttering Magnets in Square Pile Precasting

1. Construction method and process control

  1.1 Construction process

  1.2 Construction methods

Construction preparation
Choose a suitable site for leveling, lay the steel mold table, sand and level the moldboard, and paint the mold release agent.

Smoothing the surface of the pouring bed

Steel processing and installation
Choose a suitable site for leveling, lay the steel formwork table, sand and level the formwork, and paint the mold release agent.

Steel bar processing and installation

Formwork support

The square pile formwork adopts whole lifting installation process, the bottom position of two ends of formwork adopts tensioner, which is used to tension the bottom of formwork, and the top of two ends of formwork adopts movable tensioner to tension the top of formwork, so that when the formwork is lifted as a whole, the formwork can be guaranteed to be a whole, and will not be easy to be dispersed. The bottom opening of the formwork adopts Shuttering Magnet.

Formwork support

Concrete Pouring
Concrete is lifted into the mold by crane tanks, and is carried out from the top part of the pile to the end of the pile. In order to improve the effect of concrete vibration, the concrete is vibrated by flat-plate vibrator combined with inserted vibrating rod.

Concrete pouring during the prefabrication of square piles

Formwork removal
Formwork removal process, first remove the formwork top mouth pull strip, and then remove the offset magnet box, Precast concrete magnet removal using special wrench, square pile formwork ends using tensioner, top open the lower mouth of the formwork, so that the formwork and the concrete surface of the square pile natural detachment. Then the square pile formwork can be lifted away from the square pile as a whole.

Formwork end tensioner

Maintenance
Square piles are maintained by conventional sprinkling for a period of not less than 14 days.

Sprinkling water on concrete piles for maintenance

2. Efficiency Comparison

Square pile prefabricated mold table process bottom pull bar changed to precast magnet can save the installation time of the bottom pull bar, the template overall lifting can save the size adjustment time after the template installation, each square pile template support dismantling can save 20 minutes, the total number of square piles in this project is 814, a total of 271 hours of savings, every day according to the calculation of the 8 hours of work time, a total of 33 days of time savings.

Work efficiency comparison table

3.Economic Benefits

Compared with the traditional steel bottom tire, the prefabrication of square piles using the mold platform process can adapt to the bottom tire of square piles with different cross-section sizes and reduce the modification cost of the steel bottom tire of the traditional process, and there are many other functions of the mold platform, for example, it can be used as the bottom tire of the caisson template assembly, etc.; due to the shortening of the time of the template erection and dismantling, the total cost of the tower crane shift and the labor cost is 131,000 RMB.

Economic Benefit Statistics

4.Application promotion

(1)The application prospect of magnet shuttering is very broad, fixing laminated floor slab side mold and wall panel side mold, fixing window mold, door mold and other independent mold.

Application of Shuttering magnet in prefabricated wall panels

(2) precast concrete shuttering magnets can not only fix the steel formwork, fixed wooden mold platform is also applicable, prefabrication branch in the silver sea international marina project, shuttering magnet has been successfully applied in the twisted king block prefabrication, which is the first time in the second company.

The application of Shuttering magnet in prefabricated Twisted King character block

(3) Next steps in the application program

precast magnets have been widely used in the assembly building industry, but in other industries have not been promoted, precast concrete magnetic box can not only be applied in the steel bottom tires, in the concrete bottom tires, the same can be applied through the pre-buried strips of steel, the next branch will focus on researching the application of Precast Concrete Formwork Button Magnet in caisson bottom formwork application, I believe that in the near future, caisson bottom formwork will adopt the process of precast concrete magnet instead of through the pressure of concrete briquettes, pre-embedded round table on the pedestal, and laying reinforcement bars to fix the formwork.

Conventional pouring beds use concrete briquettes to hold the formwork in place