A prefabricated construction method of reinforced concrete segments for shield tunneling construction

Abstract

The invention discloses a shield segment prefabrication method, comprising: step 1, manufacturing, cleaning and assembling a segment mold; step 2, manufacturing a steel cage; step 3, installing a circular steel edge water stop ring and two water stop rings Install the cap on the pre-embedded pipe; step 4, fix the assembled pre-embedded pipe on the steel cage, and place the steel cage in the mold; step 5, use cement, water, sand, stones, water reducing agent, powder Coal ash mixing concrete; Step 6, spread concrete in the mold, and vibrate and plaster the concrete; Step 7, steam curing the concrete segments; Step 8, demoulding the concrete segments; Step 9, Concrete segments are hydroponically grown. The segment manufactured by the shield segment prefabrication method of the present invention can effectively reduce the water leakage rate in the secondary grouting process.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a construction method for prefabricating reinforced concrete segments for shield tunneling construction. Background technique [0002] The speed of urbanization in China is accelerating, and traffic congestion has become a problem in front of us. In order to increase people's transportation methods without occupying ground resources, the subway came into being. At present, urban underground tunnels are basically driven by shield machines. This method is safe and reliable, with low cost and convenient installation of shield segments. Shield segment is the main assembly component of shield construction and the innermost barrier of the tunnel. It bears the role of resisting earth pressure, groundwater pressure and some special loads. The quality of the shield segment is related to the overall quality and safety of the tunnel. [0003] For example, the invention with t...

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Problems solved by technology

[0005] 1. Shield excavation occurs in the water-rich sand layer with a high water content. As the electric drill penetrates the segments that require secondary grouting, the geology of the area is further disturbed, and the water leakage rate is easily aggravated. Traditional grouting holes After the completion of the plugging measures, the water leakage rate at the end of the grouting hole has not been effectively reduced, and the hidden danger is relatively large, and subsequent remedial measures for this part need to be carried out many times, wasting a lot of money

[0006] 2. The mix ratio of shield segment concrete cannot meet the characteristics of high strength, high impermeability, good durability, and good adaptability to steam curing

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