Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Construction method of complex curved surface ultra-long span ultra-high performance concrete roof truss
The invention provides a construction method of a complex curved surface ultra-long span ultra-high performance concrete roof truss, which comprises the following steps: providing a curved surface support template, and reducing the contact area of a bottom die and a side die; before pouring, the roof truss is segmented in the axial direction of the roof truss, the length of each segment is controlled to be 3-5 m, and temporary baffles are arranged at the segmented positions; pouring each pre-divided segment area by using UHPC (Ultra High Performance Concrete) blocks; the pouring interval time of every two adjacent sections is controlled within 20 min, the temporary baffles are dismantled after the two adjacent sections are poured, spraying humidification is conducted on the UHPC lap joint of the two sections, inserting and tamping are conducted through reinforcing steel bars, and it is ensured that the UHPCs of the two adjacent sections are fully mixed into a whole; when the UHPC reaches initial setting, spraying humidification and secondary wiping pressing are carried out, and after the UHPC reaches final setting, under-film water storage maintenance is carried out; and 12 h after pouring is completed, the curved surface supporting formwork is dismantled, a steam curing shed is covered, steam curing is conducted, and the complex curved surface ultra-long span UHPC roof truss is obtained. According to the construction method provided by the invention, shrinkage cracks and cold cracks can be prevented from being generated, and by optimizing the structure of the support template, the template removal difficulty is reduced, and the construction efficiency is improved.
本发明提供一种复杂曲面超长跨度超高性能混凝土屋架的施工方法，包括如下步骤：提供曲面支护模板，减少底模与侧模的接触面积；浇筑前，沿屋架轴向将屋架进行分段，每段长度控制在3‑5m，并在分段处设置临时挡板；采用UHPC分块浇筑每个预先分好的节段区域；相邻两个节段浇筑间隔时间控制在20min内，相邻两节段浇筑完成后拆除临时挡板，并在两节段UHPC搭接处喷雾增湿，用钢筋插捣，确保相邻两节段的UHPC充分混合成一个整体；UHPC达到初凝时，进行喷雾增湿并二次抹压，在UHPC达到终凝后进行膜下蓄水养护；浇筑完成12h后，拆除曲面支护模板，覆盖蒸养棚，进行蒸汽养护，获得复杂曲面超长跨度UHPC屋架。本发明提供的施工方法，可防止收缩裂缝和冷缝的产生，通过优化支护模板的结构，降低了拆模难度，提高了施工效率。
Construction method of complex curved surface ultra-long span ultra-high performance concrete roof truss
The invention provides a construction method of a complex curved surface ultra-long span ultra-high performance concrete roof truss, which comprises the following steps: providing a curved surface support template, and reducing the contact area of a bottom die and a side die; before pouring, the roof truss is segmented in the axial direction of the roof truss, the length of each segment is controlled to be 3-5 m, and temporary baffles are arranged at the segmented positions; pouring each pre-divided segment area by using UHPC (Ultra High Performance Concrete) blocks; the pouring interval time of every two adjacent sections is controlled within 20 min, the temporary baffles are dismantled after the two adjacent sections are poured, spraying humidification is conducted on the UHPC lap joint of the two sections, inserting and tamping are conducted through reinforcing steel bars, and it is ensured that the UHPCs of the two adjacent sections are fully mixed into a whole; when the UHPC reaches initial setting, spraying humidification and secondary wiping pressing are carried out, and after the UHPC reaches final setting, under-film water storage maintenance is carried out; and 12 h after pouring is completed, the curved surface supporting formwork is dismantled, a steam curing shed is covered, steam curing is conducted, and the complex curved surface ultra-long span UHPC roof truss is obtained. According to the construction method provided by the invention, shrinkage cracks and cold cracks can be prevented from being generated, and by optimizing the structure of the support template, the template removal difficulty is reduced, and the construction efficiency is improved.
本发明提供一种复杂曲面超长跨度超高性能混凝土屋架的施工方法，包括如下步骤：提供曲面支护模板，减少底模与侧模的接触面积；浇筑前，沿屋架轴向将屋架进行分段，每段长度控制在3‑5m，并在分段处设置临时挡板；采用UHPC分块浇筑每个预先分好的节段区域；相邻两个节段浇筑间隔时间控制在20min内，相邻两节段浇筑完成后拆除临时挡板，并在两节段UHPC搭接处喷雾增湿，用钢筋插捣，确保相邻两节段的UHPC充分混合成一个整体；UHPC达到初凝时，进行喷雾增湿并二次抹压，在UHPC达到终凝后进行膜下蓄水养护；浇筑完成12h后，拆除曲面支护模板，覆盖蒸养棚，进行蒸汽养护，获得复杂曲面超长跨度UHPC屋架。本发明提供的施工方法，可防止收缩裂缝和冷缝的产生，通过优化支护模板的结构，降低了拆模难度，提高了施工效率。
Construction method of complex curved surface ultra-long span ultra-high performance concrete roof truss
一种复杂曲面超长跨度超高性能混凝土屋架的施工方法
WANG WENTING (Autor:in) / HU TAO (Autor:in) / LIU SHANGWU (Autor:in) / DU ZHIXIANG (Autor:in) / WANG HONGXIN (Autor:in) / SHANG TAOPING (Autor:in) / XU SEN (Autor:in) / LI JIAYU (Autor:in) / SHI CHUANGYE (Autor:in) / MOTOYOSHI (Autor:in)
19.03.2024
Patent
Elektronische Ressource
Chinesisch
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