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https://patents.google.com/patent/CN108086354A/en
CN108086354A - Prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden...
A prefabricated assembled comprehensive pipe gallery spliced by cast-in-place hidden beams and a construction method thereof, wherein the comprehensive pipe...
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https://patents.google.com/patent/CN206374015U/en
CN206374015U - Concrete pipe gallery vertical-forming die and system - Google Patents
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https://dinglimachinery.en.made-in-china.com/product/CtErODLdfFWP/China-Square-Concrete-Box-Culvert-Moulds-for-Underground-Pipe-Gallery.html
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