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A platform for research: civil engineering, architecture and urbanism
Construction method of rotary digging hole-forming cast-in-situ bored pile
The invention discloses a construction method of a rotary digging hole-forming cast-in-situ bored pile. The construction method is characterized by comprising the following steps: step 1, excavating a hole to a target depth, cleaning the hole, and then checking and accepting the depth in the hole; step 2, manufacturing a reinforcement cage and hoisting the reinforcement cage into a hole; and step 3, splicing guide pipes, lowering the guide pipes, and pouring concrete slurry along the guide pipes. A coating formed by curing a coating is fixed on the inner wall of the guide pipes, and the coating is prepared from the following components: an isocyanate prepolymer, modified polyurethane, a catalyst, a solvent, a polymerization inhibitor, an anti-aging agent, a flatting agent and a defoaming agent. A preparation method of the modified polyurethane comprises the following steps: mixing acrylic acid terminated polyurethane, fumed silica and hydroxyl-terminated polydimethylsiloxane, uniformly stirring, adjusting the pH value to 8-9, heating, then cooling, and then keeping the temperature for 1-2 days to obtain the modified polyurethane. According to the construction method, the phenomenon that pipe clamping or guide pipe empty pulling accidents are likely to occur in the guide pipe pulling process is overcome, and stable lifting of the guide pipes is achieved.
本发明公开了一种旋挖成孔钻孔灌注桩的施工方法，其特征在于：包括以下步骤：步骤1，旋挖钻孔至目标深度，清孔，接着验收孔内深度；步骤2，制作钢筋笼，吊装入孔；步骤3，将导管拼接好，下放导管，沿导管灌注混凝土浆料；导管的内壁固定有涂料固化形成的涂层，涂料由以下组分组成：异氰酸酯预聚体、改性聚氨酯、催化剂、溶剂、阻聚剂、抗老化剂、流平剂和消泡剂。改性聚氨酯的制备方法如下：将丙烯酸封端聚氨酯、气相化二氧化硅和端羟基聚二甲基硅氧烷混合，搅拌均匀，调节pH为8‑9，先升温降温，接着在保温1‑2天，得到改性聚氨酯。本申请有利于克服导管拔管过程中容易出现卡管或者导管拔空事故的现象，实现导管的稳定提升。
Construction method of rotary digging hole-forming cast-in-situ bored pile
The invention discloses a construction method of a rotary digging hole-forming cast-in-situ bored pile. The construction method is characterized by comprising the following steps: step 1, excavating a hole to a target depth, cleaning the hole, and then checking and accepting the depth in the hole; step 2, manufacturing a reinforcement cage and hoisting the reinforcement cage into a hole; and step 3, splicing guide pipes, lowering the guide pipes, and pouring concrete slurry along the guide pipes. A coating formed by curing a coating is fixed on the inner wall of the guide pipes, and the coating is prepared from the following components: an isocyanate prepolymer, modified polyurethane, a catalyst, a solvent, a polymerization inhibitor, an anti-aging agent, a flatting agent and a defoaming agent. A preparation method of the modified polyurethane comprises the following steps: mixing acrylic acid terminated polyurethane, fumed silica and hydroxyl-terminated polydimethylsiloxane, uniformly stirring, adjusting the pH value to 8-9, heating, then cooling, and then keeping the temperature for 1-2 days to obtain the modified polyurethane. According to the construction method, the phenomenon that pipe clamping or guide pipe empty pulling accidents are likely to occur in the guide pipe pulling process is overcome, and stable lifting of the guide pipes is achieved.
本发明公开了一种旋挖成孔钻孔灌注桩的施工方法，其特征在于：包括以下步骤：步骤1，旋挖钻孔至目标深度，清孔，接着验收孔内深度；步骤2，制作钢筋笼，吊装入孔；步骤3，将导管拼接好，下放导管，沿导管灌注混凝土浆料；导管的内壁固定有涂料固化形成的涂层，涂料由以下组分组成：异氰酸酯预聚体、改性聚氨酯、催化剂、溶剂、阻聚剂、抗老化剂、流平剂和消泡剂。改性聚氨酯的制备方法如下：将丙烯酸封端聚氨酯、气相化二氧化硅和端羟基聚二甲基硅氧烷混合，搅拌均匀，调节pH为8‑9，先升温降温，接着在保温1‑2天，得到改性聚氨酯。本申请有利于克服导管拔管过程中容易出现卡管或者导管拔空事故的现象，实现导管的稳定提升。
Construction method of rotary digging hole-forming cast-in-situ bored pile
一种旋挖成孔钻孔灌注桩的施工方法
DONG YULIANG (author) / MAI XIAOJUN (author)
2022-02-15
Patent
Electronic Resource
Chinese
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