A Method for Reconstruction of Masonry Arch Bridge with Longitudinal Perforation and Constant Load Balance

Abstract

The invention belongs to the technical field of bridge construction, and discloses a masonry arch bridge longitudinal perforation dead load balance transformation method. The masonry arch bridge longitudinal perforation dead load balance transformation method comprises the following steps: (a) a part of concrete of a bridge floor cast-in-place layer on the downslope side is removed; (b) channeling is carried out on an arch cavity filling along the longitudinal direction of a masonry arch bridge and a longitudinal groove is formed; (c) an abutment is arranged in the longitudinal groove, a perforation cover plate is laid, the abutment and two side walls jointly support the perforation cover plate, with this mode, longitudinal perforation holes are formed between the perforation cover plate and the arch cavity filling; and (d) concrete is poured on the perforation cover plate for filling a gap formed by the concrete removed in the step (a), thereby accomplishing masonry arch bridge longitudinal perforation dead load balance transformation. On the premise that no bridge floor longitudinal slope is changed, symmetrical balance of dead load weight of the left side and the right side of the masonry arch bridge is realized, stress symmetry of a main arch ring is guaranteed, the bridge safety is improved effectively, and the appearance uniformity of the upslope side and the downslope side of the masonry arch bridge is realized.

Description

technical field [0001] The invention belongs to the technical field of bridge road construction, and more specifically relates to a method for retrofitting a masonry arch bridge with longitudinal perforation and constant load balance. Background technique [0002] Masonry arch bridge is a bridge structure with a long history. It is famous for its large load capacity, convenient material acquisition, firmness and durability, low maintenance cost, beautiful appearance, less technical work required, low construction cost and simple construction technology. world, is widely used. However, due to road reconstruction and longitudinal slope requirements, the decks of existing or many new masonry arch bridges need to be set in the form of unequal heights on the left and right sides to form a certain longitudinal slope to meet the vertical requirements of the road. However, the masonry arch bridge cannot bear the tensile force because the main arch ring has no steel bars. In order t...

AI Technical Summary

Problems solved by technology

However, the masonry arch bridge cannot bear the tensile force because the main arch ring has no steel bars. In order to seek the ideal pressure arch axis, the main arch ring needs to be set in a left-right symmetrical form, and the left and right sides of the bridge deck are not of the same height, which results in constant construction on the arch. Load asymmetry, this asymmetric dead load is applied to the main arch ring, which often causes the main arch ring to generate large tension and crack

For example, for an arch bridge with a span of 50m, if the longitudinal slope of the bridge deck is 5.0%, the height difference between the uphill side and the downhill side will reach 2.5m. The side dead load is seriously asymmetrical, and in this case, the cracking of the masonry arch ring is often difficult to avoid

[0003] In view of the above problems, the current solution is generally to adjust the longitudinal slope of the bridge deck and reduce the height difference between the left and right sides as much as possible. Especially for the reconstruction of masonry arch bridges, since the main arch ring can no longer adjust the alignment, most of them do not have a better method

However, the existing reconstruction technology has the following problems that cannot be overcome. On the one hand, even if the slope of the bridge deck road is reduced as much as possible, the dead load weight of the arches on the left and right sides cannot be symmetrical unless the longitudinal slope is adjusted to 0%. On the other hand, After the longitudinal slope of the bridge deck is adjusted, the linear slope of other places will inevitably increase, which will deteriorate the driving conditions

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