Cement pipe manufacturers answer the key control points for the production of reinforced concrete cement pipes . Guangzhou Cement Pipe, as its name implies, is a type of cement pipe produced in Guangzhou. It has good quality, solid raw materials, strict control of the production process, and every process is methodical. Next, we will talk about the key control points of Guangzhou cement pipe production.
1.PVC film processing
1.1 The fixed length (perimeter) of the film can be determined according to the perimeter of the lower end of the core mold. When welding, it is overlapped by 20㎜, which means that the film is 20㎜ smaller than the perimeter of the core mold. The finished tube will not show the film wrinkling phenomenon. When the length is fixed, it must be ensured that the film is flat and in a soft state.
1.2 Longitudinal length should ensure that the T key length is 2500㎜ (because it will be shortened by 20㎜ after being inserted into the core mold), and the keyless part is not required to be 30㎜. Make sure that the lower side is flush after inserting into the core mold, without length The uneven phenomenon can ensure that there is no leakage or less leakage at the lower end.
1.3 The overlap welding part should ensure a width of 20㎜, the welding should be full and flat, and there should be no open welding, missing welding, charring (scorching). Before welding, the influence of the T key should be fully considered. The center of the T key and the T key should be ensured. The center interval is not greater than 67㎜. When it is larger than 67㎜, the T key must not be removed.
2. Mandrel processing
2.1 Drill a few steam holes evenly at the lower and middle positions of the core mold, and first introduce air during demolding to reduce drag.
2.2 The core mold should be processed before being inserted into the film. The ash deposit on the excitation ring should be cleaned up, the dry ash residue on the flat surface of the core mold should be cleaned, and the core mold should be brushed with good oil to reduce the resistance of the mold.
2.3 Four jacks (distributed at 90o) are set in the foundation pit, and the positions are set under the bottom tray, so that it is easy to apply the top force to the bottom tray first during demolding to reduce the overhead load.
3. Film is inserted into the core mold
3.1 Hang the bottom tray into the inner mold with the outer mold, place it on the excitation ring, and then hang the outer mold.
3.2 In order to ensure the temperature in the workshop, all the doors should be closed before the film is set to avoid the sudden drop in temperature and the film to become hard. Select films with satisfactory softness. In order to work faster, it is best to cooperate with 6 people. Each person serves as a board. When hanging the film, ensure that the circumference is evenly distributed. The overhead crane moves quickly to the upper end of the core mold until it approaches the upper cover of the core mold. Then lower the speed. It is best to ensure that there are 4 people on the core mold and 2-3 people in the foundation pit when the film is lowered. When the film is inserted into the core mold, the person kicks the film to make it fall smoothly. The film can be 1 meter high. Take off the board card, the vibrator can be opened at this time, the personnel in the foundation pit hold the T key of the film and pull it down, but you should pay attention not to go out to avoid the film deformation.
3.3 After inserting the film, you should carefully check whether there is any problem with the film, such as: bulging, length, missing key, perimeter, flat bottom, open welding, etc. After confirming that there is no problem, use the plugging agent to seal the gap between the film and the bottom tray. Plug it, then insert it into the outer mold and put it into the reinforced skeleton. When lowering the skeleton, pay attention to the pads of the inner ribs and put them into the two T keys. Hoop the upper end of the film with a rubber strip to start production.
4. Fabric production
4.1 In order to avoid slurry leakage at the lower end of the pipe, the first plate of concrete is fed directly, and the vibrator is opened when the second plate is fed, to ensure that the fluidity of the concrete and the distribution opening are appropriate, so that the concrete can be leveled in time and the surface liquefies. The final tray has a much smaller water-cement ratio than the previous one, which is convenient for forming the socket.
4.2 After the cloth is finished, remove the rubber strip. When rubbing, you should always observe whether the rubbing plate can hold the film.
5.1 Before demoulding, first open the jack in the foundation pit, make the jack press against the bottom tray, open the air pressure steam into the hole on the inner mold, blow the film to the film with steam, and reduce the friction between the film and the core mold. The crane works with the jack and air compressor. Pay attention not to move only one of them.
5.2 Suspend when demolding to 500㎜, several people cooperate to put an inner ring on the upper end of the inner wall of the tube to prevent the film from falling. After completely removing the inner mold, after processing the ash deposit on the film, the inner end of the tube is also inserted into the inner ring.
5.3 Lift the mold to the steaming area to remove the outer mold.
In order to avoid high temperature steaming, which will cause the film to bubble, the steaming temperature should be controlled to 55 ° C. In order to ensure the strength of the tube, steaming for 16 hours, the steam will be turned off in 12 hours to naturally cool down and avoid cracks on the outside wall .
7 socket end film processing
Because the project requires the film to be flush with the upper mouth of the pipe, when cutting, the cut section should be used to cut off the part of the film without the T key. The cut should be flat and free of irregularities.
8 treatment of the outer wall of the pipe and the socket surface
8.1 Brush the outer wall with water asphalt, add water to the water asphalt according to 1: 1, and brush evenly.
8.2 After finishing the socket and socket, brush the primer twice and the top coat twice, and the thickness of the epoxy coal asphalt paint not less than 1.2㎜.
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