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两河口大桥在施工过程中采用了分7段分2层浇注方式,其顺序是先拱脚,再拱顶两侧,然后对称向上浇注,最后封顶。在本施工阶段中确保拱肋的稳定,拱肋各截面的应力不超过允许值,以及保证拱肋线型处在设计和规范规定的范围内是该阶段的施工控制主要目标。施工当时在L/8、L/4、3L/8、L/2处共设置了14个点,以便监测。结果表明:拱顶截面在浇注钢筋砼的施工过程中,在L/2处挠度最大,预计挠度最大值为0.02487m,挠度的产业化幅度也最大,挠度的变化幅值为0.03769m。由此可见,拱肋截面的刚度较大,在浇注砼的施工过程中的变形不大,能够满足施工中拱肋对挠度的要求。拱肋横向轴线偏移量在规范允许值内,拱肋线型在设计规定的范围内,达到了分析、监测及控制的预期目标。
Lianghekou Bridge in the construction process using sub-7 points and 2 layers of pouring, the order is the first arch, and then on both sides of the vault, and then symmetrically upward pouring, and finally capped. It is the main goal of construction control in this stage to ensure the stability of the arch ribs and the stress of each section of the arch ribs not to exceed the allowable value in the construction phase and to ensure that the arch rib line type is within the design and specification limits. At the time of construction, a total of 14 points were set at L / 8, L / 4, 3L / 8 and L / 2 for monitoring. The results show that the deflection of the dome section is the largest at L / 2 during the construction of cast-in-place reinforced concrete. The maximum deflection is estimated to be 0.02487m. The deflection amplitude is also the largest. The deflection amplitude is 0.03769m. Thus, the rib section of the larger stiffness in the pouring of concrete during the deformation is small, to meet the construction requirements of the arch rib deflection. Arch rib horizontal axis offset within the allowable value of the standard, arch ribs line within the framework of the design to achieve the analysis, monitoring and control of the expected target.