Double-block type ballastless track interlayer mortar overflow treatment material and process

Abstract

The invention relates to a double-block type ballastless track interlayer mortar overflow treatment material and process. The material is characterized in that the material is composed of a part A anda part B. The part A is composed of the following raw materials in parts by mass: 100 parts of modified epoxy resin, 10-20 parts of a micro-expansion prepolymer, 20-40 parts of an active dilution toughening agent and 5-10 parts of a silane coupling agent; the part B is prepared from the following raw materials in parts by mass: 60-80 parts of an amine curing agent, 30-60 parts of a plasticizer, 4-8 parts of a silane coupling agent and 1-3 parts of an organic silicon defoaming agent; and the volume ratio of the part A to the part B is 1: 1. The interlayer mortar overflow treatment process comprises the steps of grouting hole forming, edge sealing, grouting and surface modification. According to the interlayer mortar overflow treatment material and process, the skylight time can be utilized, the interlayer mortar overflow disease of the double-block type ballastless track is rapidly and effectively solved, normal operation of a train is not affected, and the structural stability and durability of the double-block type ballastless track are recovered.

Description

technical field [0001] The invention belongs to the field of rail transportation, and in particular relates to a material and a process for treating slurry leakage between layers of a double-block ballastless track. Background technique [0002] Among the high-speed railways operated in China, more than 70% of the mileage adopts ballastless track structure. The ballastless track subgrade is the basis for bearing track and train loads. It is a geotechnical structure working under complex conditions. It is prone to subgrade diseases due to the action, invasion and influence of repeated dynamic loads of geology, water, rainfall, climate, and trains. Since it was put into operation, ballastless track diseases under some special climate and geological conditions have gradually appeared. none [0003] Slurry leakage between layers of ballastless track is a typical disease form of ballastless track in high-speed railways in recent years. In the multi-layer structure system of hi...

AI Technical Summary

Problems solved by technology

However, due to the special structure of the ballastless track of high-speed railways, the conditions for repairing the gaps between layers at the grout are harsh and the quality requirements are high. filled full

Epoxy resin has high rigidity, but low toughness, and is prone to brittle failure under the dynamic load and temperature force of high-speed trains

Moreover, in order to reduce the viscosity of epoxy grouting materials, diluents need to be added, which seriously affects the mechanical strength and bonding strength of the material, and greatly delays the reaction speed of the material, resulting in insufficient early bearing capacity, which is difficult to meet after the "skylight period". Immediate traffic request

Volatile thinners can also cause damage to personnel and the environment

At the same time, the shrinkage of epoxy grouting material is large, which seriously affects its bonding effect with concrete

The two-component epoxy resin has a large difference in volume. During construction, it needs to be weighed and stirred according to the proportion before grouting through the pouring equipment. The construction efficiency is low. This grouting method is greatly limited by the reaction speed of the epoxy resin.

"A soybean oil-based polyurethane / epoxy resin grouting material and its preparation method" (CN201810148997), "High strength and high fluidity epoxy resin grouting material and its preparation method" (CN201711423774), "Low viscosity and low toxicity epoxy resin grouting Materials and its preparation method" (CN201710436226), "A micro-expansion modified epoxy resin grouting material and its preparation method" (CN201710335365) and other patents have optimized the epoxy resin grouting material to a certain extent, but the degree of optimization is limited. Moreover, only a single or part of the performance of the material has been improved, and it still cannot meet the needs of double-block ballastless track for slurry treatment

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