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Matters needing attention in secondary lining construction
202 1 New textbook P280 (II) Secondary Lining Construction, this paper will introduce the matters needing attention in secondary lining construction to help readers better understand the construction process.

Deformation joint setting

Deformation joints should be set according to the design, and coincide with the position of deformation joints in initial support.

Template construction quality assurance

The reserved settlement of formwork support is10 ~ 30 mm.

Concrete pouring quality assurance

Pouring shall be carried out from bottom to top, and all parts shall be poured symmetrically, and the vibrator shall not touch the waterproof layer.

Quality Assurance of Pumped Concrete

The dosage of water reducer and retarder should be determined by experiments; When adding waterproofing agent and micro-expansive agent, the dosage should be controlled through dynamic operation test; It is forbidden to add water to concrete when pouring.

The strength of inverted arch concrete reaches the standard.

Inverted arch concrete strength can be carried out only after it reaches 5MPa, and the vehicle can be notified only after it reaches 100% of the strength specified in the design documents.