水泥混凝土制品_2021_《混凝土與水泥制品》雜志社

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水泥混凝土制品

立體脈動式預制混凝土板柔性生產線的研發與應用

劉加華1，紀先鋒2

2021年第8期

摘要

引用本文

摘 ? 要：針對目前國內預制混凝土板自動化流水生產線存在的問題（主輔工位數量不匹配、設備瓶頸多、養護效率低、設備利用率低、難以實現柔性生產等），研發了脈動式預制混凝土板柔性生產線。實際生產表明，采用該生產線，預制混凝土板的生產效率比傳統流水生產線提高了3倍以上。同時，該生產線具有生產成本低、土地利用率高、設備坪效比高等優勢，可進一步推廣應用。 Abstract: Aiming at the problems existing in the automatic flow production line for precast concrete slab(the number mismatch between main operation stations and auxiliary stations, many equipment bottlenecks, low standard maintenance efficiency, low utilization rate of equipment, and difficulty in flexible production), a three-dimensional pulsating flexible production line for precast concrete slab was developed. The actual production shows that the production efficiency of precast concrete slab with the flexiable production line can be increased by more than 3 times compared with that of the traditional production line. At the same time, it has the advantages of low production cost, high land utilization rate and high equipment ground effect ratio, which can be further promoted and applied.

劉加華,紀先鋒.立體脈動式預制混凝土板柔性生產線的研發與應用[J].混凝土與水泥制品,2021(8):37-40. LIU J H,JI X F.Development and Application of Flexible Production Line for Three-dimensional Pulsating Precast Concrete Slab[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):37-40.

石粉對預制沉管機制砂混凝土性能的影響研究

徐延，劉行，李超，胡文剛

2021年第8期

摘要

引用本文

摘 ? 要：研究了石粉含量對預制沉管機制砂混凝土工作性、力學性能等的影響。結果表明：石粉含量過大會導致混凝土拌和物含氣量下降、黏聚性提高、流動性降低；石粉在混凝土中主要起填充作用，當石粉含量在10%左右時，混凝土的力學性能和抗氯離子滲透性較好；石粉含量過大會導致混凝土塑性開裂敏感性提高，但在合適養護條件下，機制砂可提高混凝土的抗裂性能；混凝土的干燥收縮率隨石粉含量和齡期增加而上升，石粉含量為10%時，混凝土的60 d干燥收縮率為311×10-6；石粉對引氣高性能混凝土抗凍性的影響不顯著，但隨石粉含量增加而下降。 Abstract: The effect of stone powder on the workability and mechanical properties of precast immersed tube manufactured-sand concrete was studied. The results show that stone powder reduces the entrained air content of concrete, increases cohesiveness and reduces fluidity. Stone powder primarily plays a role of micro-aggregate filling. When the stone powder content is about 10%, the mechanical performance and the resistance to chloride ion diffusion are the best. Stone powder enhances the plastic cracking sensitivity of concrete, but the manufactured sand is beneficial to advance the crack resistance of concrete under good curing. The drying shrinkage rate of concrete rises with stone powder content increasing. When the stone powder content is 10%, the 60 d drying shrinkage rate is 311×10-6. The influence of stone powder on the frost resistance of air-entrained high performance concrete is not significant, but it appears to decrease with the increase of stone powder content.

徐延,劉行,李超,等.石粉對預制沉管機制砂混凝土性能的影響研究[J].混凝土與水泥制品,2021(8):41-44. XU Y,LIU H,LI C,et al.Influence of Stone Powder on the Performance of Sand Concrete for Precast Immersed Tube Manufactured[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):41-44.

基于裝配式結構施工便捷的預應力疊合梁應用研究

王杰1,2，張慶1,2，吳光偉1,2，周冰凌1,2

2021年第8期

摘要

引用本文

摘 ? 要：提出了一種構造簡單的基于施工需求設計的預應力疊合梁，借助常見的混凝土框架案例，構筑了依托預應力疊合梁、板組成的施工免支撐結構方案，介紹了該種預應力疊合梁的計算控制要點，可為預應力疊合梁在裝配式框架結構中的應用提供參考。 Abstract: A prestressed composite beam designed based on construction requirements with a simple structure is put forward. With the help of common concrete frame cases, the construction free support structure system based on prestressed composite beam and slab is constructed, and the calculation control points of the prestressed composite beam are introduced, which can provide a reference for the application of prestressed composite beams in prefabricated frame structures.

王杰,張慶,吳光偉,等.基于裝配式結構施工便捷的預應力疊合梁應用研究[J].混凝土與水泥制品,2021(8):45-48,63. WANG J,ZHANG Q,WU G W,et al.Application of Prestressed Composite Beam Based on Convenient Construction of Prefabricated Structures[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):45-48,63.

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