EPDM Rubber Elastic Gasket

The rubber gasket for shield method tunnel sheet (hereinafter referred to as the sheet gasket) is mainly produced by EPDM rubber.

Type: EPDM rubber gasket (for ring and longitudinal joints) and composite gasket with surface compound water swellable rubber (for deformation joints ring joints).

Product specifications: section size 33mm×16mm, 42mm×16.5mm, 35mm×17mm, etc. (can be processed and produced according to the drawings provided).

Executive Standard: "Polymer Waterproof Material Part IV Rubber Gasket for Shield Method Tunnel Sheet" GB18173.4-2010.

Table 2 Physical properties of the finished elastic rubber gasket

Table 3 Physical properties of water-expandable rubber gasket material

Product construction process

(1) The damaged parts on the bottom and both sides of the groove, such as missing edges, dropped corners, pits, cracks exceeding 0.2mm, etc., should be repaired with epoxy mortar not lower than the strength of the concrete of the pipe piece.

(2) use, brush, etc. to remove the mud and dust, floating slurry, water stains, and oil stains on the surface of the pipe piece pre-groove, also available thinner to clean the water stop and the surface of the pipe piece groove.

(3) The surface of the groove of the pipe sheet shall not have holes, cracks, breakage, looseness, etc..

(4) The surface of the groove should be clean, smooth, dry and free of oil and dust, and the surface of the tube sheet gasket should also be kept clean, dry and free of oil and dust, etc.

.4Adhesive tube sheet gasket

(1) Place the frame-type gasket on the tube sheet, check whether the type and position are correct, and then let it hang on the tube sheet.

(2) The adhesive should be mixed evenly and frequently stirred during the pasting operation.

(3) Apply adhesive on the bottom and side of the gasket first, and then apply adhesive on the bottom and side of the groove. The adhesive should be applied evenly and completely cover the bottom and sides of the groove and gasket.

(4) after the first coat of adhesive surface dry (not sticky hands), and then coated a second time, to evaporate the solvent to touch the hand slightly sticky and not sticky hands, the gasket will be pasted in the groove.

(5) When pasting the gasket in the groove, the four corners positioning method should be used. First put the four corners in, the angle should be consistent with the recess of the pipe piece, then the short side first and then the long side, paste from the middle to both sides.

(6) Hit the gasket with a rubber hammer to make it firmly bonded with the pipe piece.

Product construction precautions

(1) Each ring elastic gasket is processed into angular frame type rubber ring in our company.

(2) Before gasket pasting, when the ambient temperature is lower than 5℃, the gasket will be placed in an oven at 40℃~60℃ for 36h of shaping treatment.

(3) The surface of the pipe sheet is dry and dust-free, and the construction of gasket paste is not carried out in rainy days.

(4) Apply single-component neoprene adhesive in the groove of the pipe sheet gasket. The adhesive should be sealed and stored dry. Before painting, the surface of the pipe sheet dry, when painting the binder should be uniform, full coating in the groove of the gasket. After the binder is painted, cool for a period of time, to finger contact does not stick, and then the processed box type rubber ring set into the gasket groove.

(5) gasket (box type rubber ring) should be firmly and tightly pasted, no hollow drum parts, the entire surface of the gasket in the same plane, strictly prohibited distortion, distortion, the four corners of the gasket does not appear shrugging shoulder, collapse shoulder phenomenon.

(6) Within 12h of pasting and installing the gasket, the pipe piece is not sent to the well for assembly.

(7) The elastic gaskets on both sides of the capping block need to be lubricated on the base surface before assembling to reduce the friction between the gaskets when the capping block is inserted. Lubricant is water-based applicator. It is recommended to set nylon thread or canvas inside the elastic sealing gasket of the longitudinal seam of the capping block and adjacent block to limit the extension of the gasket during insertion.

(8) water-expanded rubber will expand when it meets water, so the surface of water-expanded rubber is painted with slow expansion agent, especially the surface of the water-expanded rubber gasket of the bottom of the arch must be painted with three slow expansion agent.

Storage of products

Notes.

1. the storage site should be no-smoking signs, and equipped with fire extinguishers.

2. Tender materials and supporting materials should be stored in a cool, ventilated and dry, well-ventilated warehouse with a temperature of -15℃～+35℃ and a relative humidity of not more than 95% to prevent rain and direct sunlight exposure. Do not allow stacking too high or heavy pressure.

3. Tender materials and supporting materials should be stored separately, strictly forbidden to store with other flammable and explosive items, and should eliminate the source of fire, away from heat sources, not in contact with acids, alkalis, oils and organic solvents, etc.

4. Tender materials and supporting materials in transport, should avoid damage, prevent rain and direct sunlight exposure.

5. in the construction should do a good job of self-protection of finished products, semi-finished products, construction personnel uniformly wear rubber soles and other soft-soled shoes to prevent damage to the waterproof layer in the construction process.

6. No stacking of materials, equipment, etc. before the protective layer is made.

7. After the construction is completed, the damage of this layer should be checked during the construction of the next process, and any damage should be repaired immediately.

Do a good job in the management and protection of incoming tender materials to avoid the construction being affected by damage and shortage of tender materials. Whether in the warehouse or on site, do not allow the tender materials and supporting materials to contact with harmful chemicals such as oil, fuel, etc., to prevent material damage and poor bonding when connecting, prohibit fire and smoking in the storage area of tender materials and supporting materials, and enter the work area with soft-soled working shoes, and do not allow nail shoes or leather shoes with iron palms.