Subway tunnel grouting admixture and preparation method thereof

Abstract

The invention belongs to the field of new materials for construction, and particularly relates to a subway tunnel grouting admixture and a preparation method thereof. The preparation method is characterized by comprising the following steps: taking 1000 parts by weight of modified lignosulfonate concrete high-efficiency water reducing agent, dissolving 1000-2000 parts by weight of water, heating to 60-100 DEG C while stirring, adding 20-200 parts by weight of crosslinking agent, and performing polycondensation reaction for 0.5-10 hours; adding 1-50 parts by weight of air entraining agent, 100-500 parts by weight of inorganic salt reinforcer and 10-50 parts by weight of water-soluble high-molecular polymer, and stirring for 10-60 minutes; and cooling to obtain a liquid product, and drying to obtain a solid powder product, wherein the modified lignosulfonate concrete high-efficiency water reducing agent can be prepared according to the ZL98116516.8 patent, the crosslinking agent is one of or a mixture of more than one of formaldehyde, melamine, polyalcohol and polyamine, and the air entraining agent is one of or a mixture of more than one of turpentine soap, rosin thermopolymer, anionic surfactant or multi-element compounds thereof.

Description

technical field [0001] The invention belongs to the field of new building materials. It specifically relates to a subway shield grouting admixture and a preparation method thereof. Background technique [0002] Subway has the advantages of large capacity, fast speed, and less pollution, and has become one of the main urban transportation tools. Subway tunnel construction technologies mainly include drill and blast method, open cut method and shield method. The shield tunneling method is relatively safe, has a high level of automation, and has little impact on ground buildings. It has become the main method of subway construction. [0003] In the process of excavating tunnels by the shield method, since the outer diameter of the shield machine is larger than that of the tunnel segment, 100-200mm is left between the lining segment and the natural soil layer (or rock layer) after the shield machine passes through. ring gap. In order to prevent ground subsidence, it is nec...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the invention patent is to provide a lignin-based subway shield grouting admixture method in the invention patent with lignosulfonate as the main raw material to solve the problems of poor stability and easy segregation in the current shield grouting layered problem