Box girder hogging moment tensioning notch formwork and construction process thereof

Abstract

The invention discloses a box girder hogging moment tensioning notch formwork and a construction process thereof. The box girder hogging moment tensioning notch formwork comprises an upper toothed plate, a middle toothed plate and a lower toothed plate. The upper toothed plate, the middle toothed plate and the lower toothed plate are sequentially connected into a whole, the upper toothed plate andthe middle toothed plate are matched to form a plurality of steel bar preformed holes, the middle toothed plate and the lower toothed plate are matched to form a plurality of steel bar preformed holes, and a plurality of tensioning preformed holes are formed in the middle toothed plate; and the upper toothed plate and the lower toothed plate are of the same structures. According to the box girderhogging moment tensioning notch formwork, optimization design is conducted on the basis of an original formwork, the whole formwork is disassembled into three pieces, the meshing depth of the formwork and steel bars is reduced, the opening area of the formwork is reduced, formwork losses are effectively reduced, formwork turnover is increased, and the hogging moment notch concrete construction quality assurance rate is increased.

Description

technical field [0001] The invention relates to a negative bending moment tension notch formwork of a box girder and a construction process thereof. Background technique [0002] Prefabricated box girders usually use comb-tooth plates as tension notch templates, such as figure 1 As shown, due to the large number of openings in the conventional comb-shaped formwork and the large opening size, it is difficult to block after erection, and grout leakage is prone to occur during construction, resulting in honeycombs, cavities and even anchors in the concrete at the negative moment notch. Evacuation situation under the backing plate. [0003] In addition, due to the impact of the construction load during construction, the steel bars and the formwork are occluded. When the formwork is stuck, the formwork needs to be removed by external force, causing damage to the concrete and deformation of the formwork, reducing the number of formwork turnover and increasing costs. Contents of...

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Problems solved by technology

[0002] Prefabricated box girders usually use comb-tooth plates as tension notch templates, such as figure 1 As shown, due to the large number of openings in the conventional comb-shaped formwork and the large opening size, it is difficult to block after erection, and grout leakage is prone to occur during construction, resulting in honeycombs, cavities and even anchors in the concrete at the negative moment notch. Evacuation situation under the backing plate

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