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A platform for research: civil engineering, architecture and urbanism
Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern
The invention discloses a continuous pouring method for preventing cracking of an arch part of large-volume concrete of a huge-span underground cavern. The continuous pouring method comprises the following steps that first, pouring pipes are arranged in the nearly horizontal section of a vault every 5+/-0.5 m in the transverse direction and every 3+/-0.5 m in the longitudinal direction, the distance between the pouring pipes and the vault is 20+/-2 cm, and the height difference between the pouring pipes at the leftmost edge and the rightmost edge and the pouring pipe in the central line is 30-70 cm; second, self-compacting concrete is prepared; third, the side wall concrete on the left side and the right side of the huge-span underground cavern is poured firstly, and the longitudinal length of each time of concrete pouring is 10+/-0.5 m; fourth, the self-compacting concrete is adopted for synchronously pouring arch shoulder sections on the left side and the right side of the arch part;and fifth, the self-compacting concrete is adopted for pouring the nearly horizontal section of the vault, symmetrical pouring is conducted from the edge to the middle in the transverse direction, sequential pouring is conducted from inside to outside in the longitudinal direction, and the pouring pipes are reserved in the concrete after pouring and not taken out. The hydration heat peak value ofthe concrete in the nearly horizontal section of the vault is decreased, so that cracking is avoided, and the engineering quality and the construction efficiency of the huge-span underground cavern are improved.
本发明公开了一种巨跨地下洞室大体积混凝土防拱部开裂的连续浇筑方法，第一步，在拱顶近水平段内按横向每5±0.5m、纵向每3±0.5m米设置一道灌注管，灌注管距离拱顶20±2cm，左右最边缘的灌注管与中线上的灌注管高度差为30—70cm；第二步，准备自密实混凝土；第三步，先浇筑巨跨地下洞室左右两侧的边墙混凝土，且每次混凝土浇筑的纵向长度为10±0.5m；第四步，采用自密实混凝土同步浇筑拱部左右两侧的拱肩段；第五步，采用自密实混凝土浇筑拱顶近水平段，采用横向由边缘向中间对称浇筑，纵向由内向外依次浇筑，浇筑后灌注管留在混凝土内不取出来。降低拱顶近水平段混凝土的水化热峰值，从而避免出现开裂，提高巨跨地下洞室的工程质量和施工效率。
Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern
The invention discloses a continuous pouring method for preventing cracking of an arch part of large-volume concrete of a huge-span underground cavern. The continuous pouring method comprises the following steps that first, pouring pipes are arranged in the nearly horizontal section of a vault every 5+/-0.5 m in the transverse direction and every 3+/-0.5 m in the longitudinal direction, the distance between the pouring pipes and the vault is 20+/-2 cm, and the height difference between the pouring pipes at the leftmost edge and the rightmost edge and the pouring pipe in the central line is 30-70 cm; second, self-compacting concrete is prepared; third, the side wall concrete on the left side and the right side of the huge-span underground cavern is poured firstly, and the longitudinal length of each time of concrete pouring is 10+/-0.5 m; fourth, the self-compacting concrete is adopted for synchronously pouring arch shoulder sections on the left side and the right side of the arch part;and fifth, the self-compacting concrete is adopted for pouring the nearly horizontal section of the vault, symmetrical pouring is conducted from the edge to the middle in the transverse direction, sequential pouring is conducted from inside to outside in the longitudinal direction, and the pouring pipes are reserved in the concrete after pouring and not taken out. The hydration heat peak value ofthe concrete in the nearly horizontal section of the vault is decreased, so that cracking is avoided, and the engineering quality and the construction efficiency of the huge-span underground cavern are improved.
本发明公开了一种巨跨地下洞室大体积混凝土防拱部开裂的连续浇筑方法，第一步，在拱顶近水平段内按横向每5±0.5m、纵向每3±0.5m米设置一道灌注管，灌注管距离拱顶20±2cm，左右最边缘的灌注管与中线上的灌注管高度差为30—70cm；第二步，准备自密实混凝土；第三步，先浇筑巨跨地下洞室左右两侧的边墙混凝土，且每次混凝土浇筑的纵向长度为10±0.5m；第四步，采用自密实混凝土同步浇筑拱部左右两侧的拱肩段；第五步，采用自密实混凝土浇筑拱顶近水平段，采用横向由边缘向中间对称浇筑，纵向由内向外依次浇筑，浇筑后灌注管留在混凝土内不取出来。降低拱顶近水平段混凝土的水化热峰值，从而避免出现开裂，提高巨跨地下洞室的工程质量和施工效率。
Continuous pouring method for preventing cracking of arch part of large-volume concrete of huge-span underground cavern
巨跨地下洞室大体积混凝土防拱部开裂的连续浇筑方法
HONG KAIRONG (author) / LI RUI (author) / GAO LIJUN (author) / AN BO (author) / ZHANG ZHIHE (author) / TANG DAOGUO (author) / XU PEI (author) / ZANG MINRUI (author) / SUN TONGLING (author) / BAI JIANGJIANG (author)
2021-01-15
Patent
Electronic Resource
Chinese
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