Glass fiber reinforced plastic pipeline fitting socket-and-spigot gluing method

Abstract

The invention relates to a glass fiber reinforced plastic pipeline fitting socket-and-spigot gluing method which can overcome the defects in the prior art. According to the technical scheme, a socketand a spigot are not directly contacted and glued, a socket groove and an inserting ring are adopted for socket-and-spigot gluing, and the diameter of the inner wall of the socket is larger than the outer diameter of an inserting pipe, so that the annular socket groove is formed after the inserting pipe is inserted into the socket; and after the socket groove is filled with adhesive, the insertingring with the shape and size close to those of the socket groove is inserted into the socket groove to extrude the adhesive to flow to cover the adhesive joint face, and meanwhile the inserting pipeis tightly clasped. The method has the beneficial effects that the bonding strength and the sealing performance are high due to the fact that the bonding part does not have defects caused by clampingair, the strength of a joint is high due to mutual clasping of the inserting ring and the inserting pipe of a socket pipe, the size and the angle of a pipe section can be accurately controlled, the field operation is very convenient, and the field installation requirement of a large-caliber pipeline fitting can be met.

Description

technical field [0001] The invention relates to a method for socket-and-socket bonding of FRP pipe fittings, which belongs to the field of composite materials. Background technique [0002] The traditional socket bonding method of FRP pipe fittings is: the inner wall of the tapered socket and the outer wall of the tapered socket are first polished and cleaned, and then the adhesive is evenly coated on the bonding surface of the inner wall of the tapered socket and the outer wall of the tapered socket , then insert the tapered socket to a certain depth into the tapered socket and hold still until the adhesive hardens. The above method is more convenient to connect FRP pipes, but there are also some disadvantages: 1) A certain amount of air will be trapped during the process of inserting the tapered socket with tape into the tapered socket with tape, which will cause defects in the glued joint. There is a certain lack of sealing and bonding strength, and there is a risk of jo...

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Problems solved by technology

The above method is more convenient to connect FRP pipes, but there are also some disadvantages: 1) A certain amount of air will be trapped during the process of inserting the tapered socket with tape into the tapered socket with tape, which will cause defects in the glued joint. There is a certain lack of sealing and bonding strength, and there is a risk of joint leakage; 2) There must be a relative displacement between the tapered socket and the tapered socket to complete the insertion, which requires a certain insertion space and size The angle is not easy to control accurately, and sometimes it will cause the problem that the size deviation of the prefabricated pipe section is large and cannot be installed; 3) The on-site plugging operation is troublesome and the reliability of the joint is very low. Pre-install the pipe section on the pipeline with glue and mark it, then remove the pipe section and apply glue on the socket and socket, then insert it into the marked position and put it back on the pipeline in the shortest possible time. In this process, the tightness and relative stillness between the tapered socket and the tapered socket cannot be guaranteed, and the reliability of the joint is very low. The problem of on-site plug-in joints often occurs after a period of use; 4) Large-diameter and large-size FRP The on-site socket bonding of pipelines is extremely difficult and the reliability of the joints is extremely low. The socket bonding method is basically no longer used on site.

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