Concrete for railway switch base filling layer and pouring method

Abstract

The invention discloses concrete for a railway switch base filling layer. The concrete is mixed by raw materials including 370 parts of cement, 180 parts of mineral mixtures, 44 parts of expanding agent, 866 parts of river sand, 738 parts of broken stones, 184 parts of water and 7.7 parts of polycarboxylic copolymer according to 1M3 filling quantity standard. When the railway switch base filling layer is poured, a leveling blanket and switch slabs are constructed according to a conventional method at first, a pouring mode by the aid of a pump truck, a transfer hopper and a chute is adopted, and each switch slab is poured at one step. As the concrete has excellent mobility and a self-filling performance, the concrete can pass through an engineering portion with compact reinforcements and the complex structural section, is dense in filling, does not segregate or leak water, and has high homogeneity, engineering quality is guaranteed, durability of a concrete structure is improved, the problem that pouring of vibration operation components is not easy to be applied or cannot be applied is resolved, pouring speed is improved, a construction process of the concrete structure is simplified, construction efficiency and construction quality are improved, and construction period is shortened.

Description

technical field [0001] The invention relates to a preparation method and pouring method of self-leveling concrete for railway construction, in particular to a concrete for a filling layer of a railway turnout base, and a method for pouring the filling layer of a railway turnout base using the concrete. Background technique [0002] The high-speed railway turnout base is composed of leveling layer, filling layer and turnout slab from bottom to top. The track is laid on the top of the turnout slab. The conventional construction method is to first carry out steel bar binding construction and insulation test, and then use the crane bucket to cooperate with the transfer bucket. Self-compacting concrete pouring construction. The use of conventional construction methods is not conducive to ensuring the continuity of self-compacting concrete pouring; second, the construction efficiency is low, the transfer bucket is relatively heavy, inconvenient to move, construction machinery such...

AI Technical Summary

Problems solved by technology

The use of conventional construction methods is not conducive to ensuring the continuity of self-compacting concrete pouring; second, the construction efficiency is low, the transfer bucket is relatively heavy, inconvenient to move, construction machinery such as cranes move frequently, and the total construction time is long; third, it cannot fully adapt to multiple Various construction environments, such as narrow sites, high-altitude operations, etc.

Due to the complex internal structure of the turnout filling layer, the thickness is only 180mm, and the distance required for concrete self-leveling is as high as 6.7m. Ordinary concrete is easy to segregate, bleed, and has poor wrapping properties under high fluidity, which cannot guarantee the quality of concealed key engineering parts. , unable to meet the construction requirements

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