A kind of epoxy structural adhesive for bridge bearing replacement and preparation method thereof

Abstract

The invention discloses an epoxy structural adhesive used for bridge support replacement and a preparation method thereof, belonging to the technical field of building adhesive materials. The epoxy structural adhesive is composed of A component and B component. A component contains epoxy resin, polyurethane modified epoxy resin, reactive diluent and auxiliary agent, etc., and B component contains modified aliphatic amine curing agent, modified Phenalkamine curing agent, modified aromatic amine curing agent and additives, etc.; the epoxy structural adhesive has excellent workability, no flow during construction and curing, long bonding time, high later strength, long service life, and durable 50 It can be applied to the replacement and repair of the bearing pad stone in the installation of bridge bearings, the leveling of the steel plate on the bearing and the bottom of the beam, and the leveling of the jack and the bottom of the beam, especially suitable for single support of large bridges and extra-large bridges. Support replacement projects with large seats and a large number of supports at a time.

Description

technical field [0001] The invention relates to an adhesive and a preparation method thereof, in particular to a special epoxy structural adhesive used for bridge support replacement and a preparation method thereof, belonging to the technical field of construction adhesive materials. Background technique [0002] Modified epoxy resin adhesives have the advantages of strong adhesion, high strength, corrosion resistance, and simple construction, and are widely used in various fields of civil engineering. "Technical Specifications for Safety Appraisal of Engineering Structure Reinforcement Materials" GB50728-2011, "Code for Design of Highway Bridge Reinforcement" JTG / TJ22-2008 stipulates the technical requirements for structural adhesives, the compressive strength ≥ 65MPa, tensile strength ≥ 30MPa, steel pair The standard value of tensile shear strength of steel is ≥15MPa, and it is clearly stipulated in GB50728 that structural adhesives with design requirements for 50-year du...

AI Technical Summary

Problems solved by technology

Due to the large load and wide width of large bridges and extra-long bridges, there are large single supports and a large number of single-pier synchronous jacking supports. The support replacement technology is more complicated and the material performance requirements are higher. There are some key problems that need to be solved urgently: (1) There are many epoxy structural adhesive materials used for a single support with a large volume, which requires the epoxy structural adhesive to have a long operating time, no flow during construction and curing, good dimensional stability, and a low reaction exothermic peak. explosion

Chinese patent CN2015104222150.6 discloses a bridge support leveling adhesive and its preparation method. The strength of the leveling adhesive used can reach 30MPa within 2 hours, the early strength is high, the operation time is too short, the bonding time is less than 2 hours, and the beam falls The time is short; the final compressive strength reaches 60MPa, the strength is low, and does not meet the requirements of relevant standards; and there is no filler in the formula components, the colloid has a fast reaction speed, a high reaction exothermic peak, and the risk of detonation. At the same time, the colloid The thermal expansion coefficient is too large, and the temperature and size effects during use are relatively large, which affects the safety and stability of the bearing, and is not suitable for the bearing replacement project of large bridges and extra-large bridges.

[0005] In addition, in the existing bridge bearing replacement technology, cement-based materials are used for the replacement and repair of the bearing pad, epoxy leveling glue is used for leveling the steel plate on the bearing and the bottom of the beam, and unsaturated resin adhesive is used for the jack and bridge. The unsaturated adhesive is used for the leveling of the beam bottom. There are many materials on site, the management is chaotic, and the construction quality control is difficult. It is urgent to develop a structural adhesive that can meet the above applications at the same time.