banner
Oct 17, 2021
0 Views
0 0

How to make a simple mold for casting cement blocks from PVC planks and pipes

How to make a simple mold for casting cement blocks from PVC planks and pipes

Cement-based hollow blocks, practically without losing strength and thermal insulation, are much lighter and cheaper than solid ones. For their manufacture, you can make a very simple, but easy-to-use form from boards and PVC pipes, having basic carpentry skills.

It will take

Materials:

  • wooden boards of various sections;
  • screws and nails;
  • wooden bars of different sections;
  • PVC pipe with a diameter of 100 mm.

Instruments: drill with a 102 mm core drill, hand screwdriver, pencil, square and tape measure, metal knitting needles, hammer, etc.

The process of making a mold for cement blocks

From a board 2 cm thick and 19 cm wide, we cut out two segments 18 cm and 39 cm long, which will serve as the outer frame of the mold for the blocks.

How to make a simple mold for casting cement blocks from PVC planks and pipes

We connect them to each other using self-tapping screws so as to ensure the dimensions of the block are 14 × 19 × 39 cm.

How to make a simple mold for casting cement blocks from PVC planks and pipes

At the level of the upper surface of the outer frame of the form in the transverse direction, on both sides, we fasten the bars with a length of 18 cm with self-tapping screws and in the center – two more bars of the same length, but with a larger section.

How to make a simple mold for casting cement blocks from PVC planks and pipes

We set the outer frame of the form in the center of the board, which is wider and longer than the frame and will serve as the basis for both the entire form and its inner part.

We apply the inner perimeter of the framing to the base, draw a longitudinal center line and on it we outline the installation locations of three PVC pipes to form voids in the block. So that the strength of the block does not suffer, we retreat from the edge of 2 cm and add another 5 cm (the value of the radius of the PVC pipe). This means that the centers of the outer pipes will be at a distance of 7 cm from the inner edges of the mold.

Since the block is 39 cm long, the distance between the centers of the outer pipes is 25 cm, then the center of the middle pipe will be at the same distance of 12.5 cm from the outer pipes.

With a drill we drill holes in three marked places and, using them for centering, we drill three through holes in the base of the mold with a core drill with a diameter of 102 mm.

How to make a simple mold for casting cement blocks from PVC planks and pipes

We insert PVC pipes 24 cm long into these holes. We measure 19 cm from the end of each of them and drill thin diametrically opposite transverse holes. We temporarily insert metal knitting needles into them to prevent the pipes from falling down when installed in the holes made in the base.

How to make a simple mold for casting cement blocks from PVC planks and pipes
How to make a simple mold for casting cement blocks from PVC planks and pipes

We turn over the base with pipes and circle its overhang on the pipe, on which we perform a system of longitudinal cuts to the mark. We bend the resulting petals outward and nail them with small nails to the base.

How to make a simple mold for casting cement blocks from PVC planks and pipes
How to make a simple mold for casting cement blocks from PVC planks and pipes

We return the base with pipes to its original position and install the outer walls of the mold. So that they do not move in the longitudinal and transverse directions, close to them we fasten two bars 18 and 39 cm long with self-tapping screws to the base.

How to make a simple mold for casting cement blocks from PVC planks and pipes

We also fasten one plank about 39 cm long on each side with self-tapping screws from the bottom of the base in the longitudinal direction. The block making mold is ready to work.

Before filling it with cement mortar, we lubricate the inner surfaces with liquid soap or any oil, for example, motor oil.

In the process of filling the form, we seal its contents several times by shaking and tamping, let the solution grab, turn the form over and remove the base with PVC pipes.

How to make a simple mold for casting cement blocks from PVC planks and pipes
How to make a simple mold for casting cement blocks from PVC planks and pipes

Then, on the surface of the block, we put a board, the dimensions of which in the plan are slightly smaller than the corresponding dimensions of the block. Holding the board with two thumbs on both sides, remove the outer frame of the form. By repeating this simple procedure, you can make the required number of blocks.

How to make a simple mold for casting cement blocks from PVC planks and pipes

Watch the video

Article Categories:
Interesting
banner

Leave a Reply