EPDM shield segment elastic sealing strip shield rubber sealing strip shield sealing gasket installation precautions
Shield segment elastic rubber gasket General name: water swelling rubber gasket, EPDM rubber elastic gasket, EPDM waterstop
Shield segment elastic rubber gasket is the mainstream material used in seal sealing of water-filled tunnel segments in Western Europe. It is composed of a single porous EPDM rubber or porous EPDM rubber and expanded rubber. to make. The material is within the range of the specific joint opening, even if the seam opening amount changes, the contact surface stress is almost constant, that is, when the seam is completely closed, there is no excessive stress at the end of the sheet, which can fully maintain contact. Surface stress.
The pipe joint water seal is made of EPDM rubber gasket. Pay attention to the operation: First, the groove of the pipe piece should be complete and there should be no gap; secondly, the glue bar should be completed 12 hours before the pipe piece is installed.
(1) Perform the quality inspection of the segments and stack the segments according to the type of segments.
(2) Clean the longitudinal contact surface of the segment and the groove where the elastic gasket is reserved.
(3) Apply a paste to the longitudinal contact surface of the segment ring, the groove to which the gasket is attached, and the elastic gasket.
(4) After applying the adhesive, let it cool for a period of time (usually 10-15 minutes, depending on the temperature and humidity). When the finger is not sticky, put the processed frame-shaped elastic gasket into the sealing groove. .
(5) When inserting the elastic gasket into the reserved groove of the segment, uniformly align the outer edge of the elastic gasket with the outer arc edge of the reserved groove of the segment, and fix the corner when inserting the elastic gasket. Ok, push it to both sides of the corner. The edge of the elastic gasket to be ribbed is mounted on the side of the back of the segment.
(6) Use the wooden hoe to tighten the elastic sealing gasket in turn so that the elastic sealing gasket is on the segment. Be careful not to break. The elastic sealing gasket after bonding should be firm, flat, tight, accurate, and must not be bulged. And the gap phenomenon.
(7) Paste the longitudinal slit of the ring in a similar way. Pay attention to the reserved bolt holes when pasting. The glued pad should not be degummed or slanted.
The elastic rubber gasket of the shield segment can reduce the compressive stress, increase the opening amount of the joint of the segment, and is not easy to be compressed for a long time to cause stress relaxation and deformation. In addition to the expanded rubber composite gasket, "double insurance" is added. If the EPDM gasket leaks, the slow-expanding expansion rubber strip will start to slowly expand when it meets the water, and the water will stop the water. To the role of two waterproof.
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