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(二) 补强基底,恢复并加强道床结构 1.矽化压浆 用于道床基底有空隙浮碴、积水或微量小流速的潜流,道床有轻微病害,如开裂或少量冒浆下沉地段。一般在病害地段两端要适当延长,而预防邻近地段新生病害;还用于基底换填和道床翻修后接合部分的补强。如果地下水大,则必须先治水后压浆,否则收效不大,或初期有效不久又失败。 道床压浆用的浆液材料的粘度要小,可灌性要好,要具有快凝早强,在灌注1h后的强度≥8kg/cm~2,而浆液的粘度和凝胶时间又必
(B) to strengthen the substrate to restore and strengthen the ballast structure 1. Silicone pressure grouting for ballast ballast bed base gap, water or trace flow rate of subfloral flow, the bed has minor diseases, such as cracking or a small amount of pulp sinking section. Generally both ends of the disease should be properly extended, and to prevent disease in neighboring areas of new diseases; also used to replace the basement and ballast renovation joints after the part of the reinforcement. If the groundwater is large, you must squeeze the water first, otherwise the effect is not big, or the initial effective soon failed. The viscosity of the slurry used in the ballast for grouting should be small and the filling ability should be good. It is necessary to have fast coagulation and early strength. After 1h of perfusion, the strength should be ≥8kg / cm ~ 2.