One、Repairing pipe fittings with pipe materials that match the pipes.
Here, the "repairing of pipe fittings that match the use with pipe materials" refers to identifying and repairing damaged PPC water pipes by selecting and installing compatible pipe fittings. The following steps can be followed:
1、Removal and chiseling
We need to repair the damaged PPC water pipes, and it is necessary to completely remove the damaged sections. This typically involves removing the existing tiles and then removing the concrete in the affected area. The removed concrete should extend at least 20 cm beyond the opening of the damaged pipe. This ensures sufficient space for installation.
2、Cleaning
"Cleaning" refers to the process of thoroughly removing any debris or residue from the pipes after they have been completely exposed. The most important step is to use cutting tools to remove any damaged areas, followed by cleaning the exterior of the pipes. If there is water leaking from the inside of the pipes, it is crucial to close the valve and use absorbent materials like sponges to remove the water. This ensures that the pipes are completely dry.
3、Heat-melt repair
At this stage, we can use a hot-melt adhesive to connect the pipes. Typically, we need two fittings: a short pipe to connect the damaged area. When repairing, we heat the PPC pipe with a hot-melt adhesive, and then heat the fitting until it reaches the required temperature, and then insert the fitting into the pipe. Following the same procedure, we connect the other end, completing the repair of the damaged water pipe.
4、Compression inspection
After PPC pipe repair is completed, it is necessary to apply pressure to confirm the repair, which ensures the quality of our hot-melt connections. Otherwise, the repair needs to be redone. The pressure can be increased to 0.8 MPa and maintained for 15 minutes. If there is no leakage, it indicates that the repair is successful, and the surface of the repaired area can then be restored.
Two. Using mechanical reinforcement fittings for repair.
Here, "using mechanical reinforcement for pipe fittings" refers to the most commonly used joint, also known as a coupling joint. This method utilizes external mechanical force to compress the internal rubber ring. This method can also be used to close holes. For this repair method, please follow the following steps:
1、Remove existing flooring
We first need to remove the damaged area of the floor, exposing the PPC water pipes underneath. The exposed length of the pipes must be at least 10 centimeters away from the center of the hole on both sides to ensure that the straps can be installed. Then, clean and wipe the exposed pipes.
2、Selection of connecting fittings
For pipe fittings repaired using mechanical methods, it is recommended to choose fittings with longer lengths. For example, if you are drilling a small hole, you should at least select a clamp with a length of 100mm to ensure a secure connection. Additionally, the clamp should be designed as two separate pieces that are then fastened together. Finally, tighten the clamping bolts on the clamp.
3、Compression testing
After the strap installation is complete, it is necessary to apply pressure, with a pressure of 0.8 MPa. At this point, check the installed straps for any water leakage or seepage. If there is no leakage or drop in pressure, it indicates that the water pipe repair is successful, and the ground can be restored.