1. Repair of rubber dam bags
In order to ensure the normal operation of the dam bag, repairs should be carried out in time after the dam bag has a defect to prevent the defect from expanding.
Repair method
⑴ The surface adhesive layer is slightly worn or punctured or scratched, and the canvas is not damaged; it can be repaired with adhesive film, and the periphery of the adhesive film should be 5-10 cm larger than the edge of the damaged surface.
(2) When the local abrasion is severe (the outer layer of rubber and the first layer of canvas are worn); the same dam bag tape shall be patched on the worn part of the dam bag, and the latitude and longitude direction of the reinforcing tape shall be the same as that of the dam bag. The size of the reinforcing tape should be more than 10 cm from the circumference of the worn part, and the sealing film shall be pasted around the reinforcing film.
⑶ Abrasion or puncture; use the same adhesive tape on the inner and outer surfaces of the dam bag, and the size of the reinforcing tape shall be at least 15cm larger than the circumference of the worn part.
⑷There are two kinds of bubbles in the tape: ①The bubble is the blisters on the surface of the adhesive layer.
Repair method: first dig out the surface glue, dry the canvas, and glue the film. ② Cloth bubble, that is, the bubble between the tape and the tape. Repair method: cut the tape along the water direction of the dam bag, dry it for repair, and reinforce it with the same tape as the dam bag.
⑸ The repair method of the tear: paste the same tape as the dam bag on both sides of the tear and paste the sealing tape to prevent the canvas from being soaked in water. For dam bags with a large torn area, double-sided adhesive patching or the entire pair of tape can be replaced according to the needs of the project.
⑹ Rescue measures can be taken when the dam bag is suddenly damaged during operation and the safety of the dam body is endangered. If the diameter of the orifice of the dam bag is less than 6 mm, the plug remedy is used, that is, the orifice is blocked by a rubber plug or a wooden plug to prevent water leakage. If the through hole is large or the area of ​​partial tearing is not large, the clamping method of the combination of steel plate and bolt can be temporarily used. The size of the steel plate depends on the specific damage size, and the number of bolts depends on the specific situation.
2. Repair process
⑴Preparation work
Tools-files or portable electric grinders, hair dryers, pressure rollers and brushes, etc.
Material-Dam bag tape, film, glue, Lekner, toluene or 120# gasoline, etc.
⑵Operation procedure:
①Clean the damaged part of the dam bag, dry it and flatten it, mark the repair area, and cut the reinforcing film (adhesive cloth) used; ②Put the wooden board under the dam bag of the part that needs to be repaired, and use a file or a grinder to cut the dam. Polish the damaged part of the bag and the reinforcing tape, and clean the rubber powder and other debris on the polished surface, and scrub it with toluene or 120# gasoline; ③Stir the prepared glue evenly; ④Use a brush to bond Apply glue 2-3 times on the surface. The drying time of each pass varies with the climate. Generally, the first pass is 15-25 minutes, the second pass is 10-20 minutes, and the third pass is finished with the glue. It is advisable not to stick your hands; ⑤ align the reinforcing tape (film) to the demarcated position,
Glue it to the damaged part of the dam bag, ⑥Press by rolling it with your hand to discharge the air bubbles, so that the bonding surface is tightly bonded; ⑦The edge of the reinforcing tape is glued to the sealing tape and compacted; ⑧Finally, use a sand bag or heavy object Press flat for 24 hours.
⑶Technical requirements:
①When bonding on site, it should be carried out at a temperature of 18-25 degrees and a relative humidity of less than 70%; ②Grinding should be carried out in order, even and smooth, without any leakage or damage to the canvas; ③Gluing in order The slurry should be uniform and not too thick. Avoid sun exposure, and prevent dust, dirt, and soaking; ④ After the reinforcing tape (film) is bonded, roll it vertically and horizontally and repeatedly compact it by hand. Do not fold the reinforcing part and keep it waterproof.
⑷ Matters needing attention;
① The warp and weft direction of the reinforcing tape must be the same as the direction of the dam bag cloth;
②Lekner, toluene, etc. are all toxic, pay attention to safety;
③ Fireworks are prohibited during repairs.

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