A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for applying prestress to composite beam
The invention relates to a method for applying prestress to a composite beam, which comprises the following steps of: jacking a steel beam through a plurality of jacking devices arranged along the longitudinal direction of a bridge, so that the line type of the whole jacked steel beam is generally an arc-shaped curve; covering the jacked steel beam with concrete to form a composite beam; and the jacking of the jacking device to the steel beam is cancelled, so that the composite beam descends to a design state, and continuous compressive pre-stress is applied to the composite beam. Due to the fact that the steel beam is jacked through the jacking devices arranged in the longitudinal bridge direction, the line type of the whole jacked steel beam is roughly an arc-shaped curve, under the condition that the jacking line type of the steel beam is the arc-shaped curve, bending moments of all points on the steel beam are equal, and after concrete covers the steel beam and descends to a design state, the steel beam is jacked through the jacking devices. The continuous and uniform pre-compressive stress can be applied to the composite beam, and the continuous and uniform pre-compressive stress applied to the composite beam can offset the continuous change influence of temperature change and shrinkage creep on the composite beam, so that the composite beam is prevented from generating cracks.
本发明涉及一种组合梁施加预应力的方法，其包括以下步骤：通过沿纵桥向排布的多处顶升装置对钢梁顶升，使整个钢梁顶升后的线型大体呈圆弧形曲线；将混凝土覆盖于顶升后的钢梁上，形成组合梁；取消顶升装置对钢梁的顶升，使组合梁下降至设计状态，以对组合梁施加连续的预压应力。由于通过沿纵桥向排布的多处顶升装置对钢梁进行顶升，使整个钢梁顶升后的线型大体呈圆弧形曲线，在钢梁起顶线型为圆弧形曲线的情况下，钢梁上每个点的弯矩也相等，在混凝土覆盖于钢梁上并下降至设计状态后，能够对组合梁施加连续均匀的预压应力，施加在组合梁上的连续均匀的预压应力能够抵消温度变化和收缩徐变对组合梁的连续变化影响，进而限制组合梁产生裂缝。
Method for applying prestress to composite beam
The invention relates to a method for applying prestress to a composite beam, which comprises the following steps of: jacking a steel beam through a plurality of jacking devices arranged along the longitudinal direction of a bridge, so that the line type of the whole jacked steel beam is generally an arc-shaped curve; covering the jacked steel beam with concrete to form a composite beam; and the jacking of the jacking device to the steel beam is cancelled, so that the composite beam descends to a design state, and continuous compressive pre-stress is applied to the composite beam. Due to the fact that the steel beam is jacked through the jacking devices arranged in the longitudinal bridge direction, the line type of the whole jacked steel beam is roughly an arc-shaped curve, under the condition that the jacking line type of the steel beam is the arc-shaped curve, bending moments of all points on the steel beam are equal, and after concrete covers the steel beam and descends to a design state, the steel beam is jacked through the jacking devices. The continuous and uniform pre-compressive stress can be applied to the composite beam, and the continuous and uniform pre-compressive stress applied to the composite beam can offset the continuous change influence of temperature change and shrinkage creep on the composite beam, so that the composite beam is prevented from generating cracks.
本发明涉及一种组合梁施加预应力的方法，其包括以下步骤：通过沿纵桥向排布的多处顶升装置对钢梁顶升，使整个钢梁顶升后的线型大体呈圆弧形曲线；将混凝土覆盖于顶升后的钢梁上，形成组合梁；取消顶升装置对钢梁的顶升，使组合梁下降至设计状态，以对组合梁施加连续的预压应力。由于通过沿纵桥向排布的多处顶升装置对钢梁进行顶升，使整个钢梁顶升后的线型大体呈圆弧形曲线，在钢梁起顶线型为圆弧形曲线的情况下，钢梁上每个点的弯矩也相等，在混凝土覆盖于钢梁上并下降至设计状态后，能够对组合梁施加连续均匀的预压应力，施加在组合梁上的连续均匀的预压应力能够抵消温度变化和收缩徐变对组合梁的连续变化影响，进而限制组合梁产生裂缝。
Method for applying prestress to composite beam
一种组合梁施加预应力的方法
ZHENG YAPENG (author) / YANG GUANGWU (author) / MANDA TAMOTSU (author) / LUO KOU (author) / ZHANG JUSHENG (author) / ZOU MINYONG (author) / LI LIN (author) / CAI LUAN (author) / SHAN QIUWEI (author) / CHENG ZIHAN (author)
2024-02-20
Patent
Electronic Resource
Chinese
IPC:
E01D
BRIDGES
,
Brücken
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