水泥混凝土制品_2022_《混凝土與水泥制品》雜志社

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水泥混凝土制品

新型預制混凝土排水溝的研發與應用

李長俊1，何文斌2，章彬虎3，鄭國平2，莊一舟2

2022年第4期

摘要

引用本文

摘 ?要：為提高公路山嶺隧道的預制化水平，提升工程質量和縮短施工工期，基于實際工程，研發了一種新型預制混凝土排水溝，介紹了其結構形式、沉砂井、排水孔等細部構造，并闡述了其生產工藝、施工技術、現場拼裝等技術要點。實際工程應用表明，該預制構件應用效果良好。 Abstract：In order to improve the prefabrication level of road mountain tunnel structure, promote the project quality and shorten the construction period, a new precast concrete drainage is developed. The structural style, sand sediment trapand and drainage hole are introduced, and the key points of production process, construction technology and on-site assembly technology of the precast concrete drainage are described. In addition, practical engineering shows that its application effect is good.

李長俊,何文斌,章彬虎,等.新型預制混凝土排水溝的研發與應用[J].混凝土與水泥制品,2022(4):33-35. LI C J,HE W B,ZHANG B H,et al.Development and Application of New Precast Concrete Drainage[J].China Concrete and Cement Products,2022(4):33-35.

加速銹蝕后預應力混凝土方樁連接接頭抗拉性能研究

樊華1，徐銓彪2,3，陳剛2,3，陳虹霖4，龔順風4

2022年第4期

摘要

引用本文

摘 ? 要：為研究氯鹽環境下預應力混凝土方樁連接接頭的耐久性能，對彈卡式與焊接式連接方樁接頭試件進行了通電加速銹蝕試驗，并對劣化后兩種接頭試件和預應力鋼棒分別進行了抗拉性能試驗。結果表明：劣化后彈卡式連接接頭試件整體連接性能較好，破壞形式為樁身裂縫開展充分，接頭連接完好，下節樁預應力鋼棒被拉斷；焊接式連接接頭試件在焊縫處銹蝕相對嚴重，軸向開裂拉力下降幅度較大，破壞形式為接頭焊縫處被拉開，兩側端板完全脫離，樁身未出現裂縫；兩種接頭形式劣化后預應力鋼棒材料力學性能下降均在10%以內。 Abstract: To study the durability of connection joints of prestressed concrete square pile in chlorine salt environments, the electrical accelerated corrosion tests were conducted on the connection joint specimens of prestressed concrete square piles using elastic clip connection and welded connection, and then the tensile behavior tests of two types of square pile connection joint specimens and the prestressing steel rods were also conducted, respectively. The results show that the deteriorated square pile joint specimens with elastic clip connection have good overall connection performance and more durability. The failure mode is that the cracks in the pile body are fully developed, the joint connection is intact, and the prestressed steel rods of the lower pile are pulled off. However, the weld seam at the connection joints for the welded connection square pile specimens are corroded seriously, and the axial cracking tensile force declines greatly. The failure mode is that there is no crack in the pile body, the weld seam at the joint connection is pulled apart and the end plates on both sides are completely detached. The mechanical properties of the prestressed steel rods decreases within 10%.

樊華,徐銓彪,陳剛,等.加速銹蝕后預應力混凝土方樁連接接頭抗拉性能研究[J].混凝土與水泥制品,2022(4):36-41. FAN H,XU Q B,CHEN G,et al.Study on Tensile Performance of Connection Joints of Prestressed Concrete Square Pile After Accelerated Corrosion[J].China Concrete and Cement Products,2022(4):36-41.

荷載作用下鋼管再生混凝土柱的受力分析及數值模擬研究

康希良，高磊，陸松亭

2022年第4期

摘要

引用本文

摘 ? 要：針對鋼管再生混凝土柱在實際工程中出現的頂部脫空現象，基于彈性力學圓筒受均布壓力的拉梅解答，分析了鋼管、核心再生混凝土分別承受的荷載大小和由于變形不協調造成的軸力傳遞長度，并基于已有的鋼管再生混凝土試驗研究，得到了兩者的理論分析值。此外，運用ANSYS有限元分析軟件模擬了不同條件下鋼管和再生混凝土的應力分布情況，并將模擬得到的壓力分配情況和軸力傳遞長度與理論值進行了對比，結果表明吻合程度較好。 Abstract： For the top void phenomenon of recycled concrete filled steel tubular column in the practical application, based on the Lame solution of elastic mechanics cylinder under uniform pressure, the load borne by steel tube and core recycled concrete respectively, and the length of axial transfer were analyzed. Based on the existing test of recycled concrete filled steel tubular, the theoretical solution was obtained. In addition, ANSYS finite element analysis software was used to simulate the load under different conditions. The pressure distribution and axial transfer length were compared with the theoretical analysis value. The simulation results were in good agreement with the theoretical results analysis.?

康希良，高磊，陸松亭.荷載作用下鋼管再生混凝土柱的受力分析及數值模擬研究[J].混凝土與水泥制品,2022(4):42-45,54. KANG X L,GAO L,LU S T.Mechanical Analysis and Numerical Simulation of Recycled Concrete Filled Steel Tubular Columns Under Load[J].China Concrete and Cement Products,2022(4): 42-45,54.

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