A kind of bolt grouting material for deep foundation pit construction and preparation method thereof

Abstract

The invention discloses a bolt grouting material for deep foundation pit construction and a preparation method thereof. First, the admixture, a part of the admixture and cement are uniformly mixed to obtain a solid material, and then another part of the admixture is added to water, and the mixture is stirred and mixed. uniformly to obtain premixed slurry, and finally add solid materials into the premixed slurry, stir and mix to obtain the described bolt grouting material; wherein, the admixture is based on fly ash and corn stalk powder Raw materials are prepared; the admixture is modified by first modifying the aluminum silicate-calcium phosphate nanoparticles to obtain the modified nanoparticles, and then performing a polymerization reaction, adding aluminum silicate-calcium phosphate nanoparticles during the polymerization process, and polymerizing After the reaction is completed, the polymer is obtained, and then the polymer is mixed with polypropylene and heated until melted, spun into fibers, and crushed. The obtained bolt grouting material has good fluidity, high early strength, high anchoring force after grouting the bolt, and meets the construction requirements of deep foundation pits.

Description

technical field [0001] The invention relates to a grouting material, in particular to a bolt grouting material for deep foundation pit construction and a preparation method thereof. It belongs to the technical field of building materials. Background technique [0002] With the continuous infiltration of the urbanization process, the number of deep foundation pit projects is increasing. Soil nails and bolts are the two most commonly used anchoring technologies in the temporary structure of foundation pit support, because of their fast construction speed, safety and reliability, low construction difficulty and It has good economy, so it is widely used in engineering construction such as slope and foundation pit support. [0003] After investigation, the grouting material used for soil nails and bolts in my country is mainly ordinary Portland cement. The setting time of the pure cement slurry in this way is long, and the early strength of the solid body formed by grouting is l...

AI Technical Summary

Problems solved by technology

The advantages of cement slurry are that the source of raw materials is wide, the price is low, and the strength of the consolidated body formed is high. The disadvantages are that the setting time is long and the time cannot be accurately controlled, the stability is low, the water separation rate is large, and the consolidated body The strength growth rate is slow, and it is easy to cause a series of problems such as grout leakage in the surrounding rock formations with large pores, poor injectability in the surrounding rock formations with micro cracks, and poor quality of grouting. Based on this, in recent years, Domestic experts and scholars have done a lot of scientific research work on improving the function of cement slurry, such as applying various chemical and physical additives to control the setting time of cement slurry, improving the stability and ease of injection of cement slurry, etc.

[0006] Generally speaking, the existing anchor grouting materials have poor fluidity, low early strength, and low anchoring force after grouting the anchor, which cannot meet the construction requirements of deep foundation pits.

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