Porous arch bridge water bag pre-pressing construction method

Abstract

The invention discloses a porous arch bridge water bag pre-pressing construction method which comprises the following steps: S1, pre-pressing control tonnage and load classification are carried out, a pre-pressing coefficient is set to be 1.2, and a pre-pressing balance weight is calculated according to 1.2 times of the upper load of each span; s2, a water bag is adopted for prepressing, and the water bag is filled with water; s3, pre-pressing implementation and observation are carried out; s4, prepressing of a foundation and a support, in the step S3, measurement control points are arranged before prepressing construction, original data of the control points are collected, accurate lofting is conducted on the control points through a total station, the control points are arranged at arch feet, 1 / 8L, 1 / 4L, 3 / 8L and an arch crown, and five points are distributed on each section and distributed on bottom dies on the axis of a bridge and the two sides of an arch ring; according to the water bag pre-pressing construction method for the porous arch bridge, inelastic deformation of the foundation and the full framing of the porous arch bridge can be eliminated, construction safety is ensured, sand or gravel can be completely eliminated after pre-pressing is completed, and resources are saved.

Description

technical field [0001] The invention relates to the technical field of municipal engineering construction, in particular to a water bag preloading construction method for a porous arch bridge. Background technique [0002] The preloading of the foundation of the arch bridge and the support of the full hall is an essential process in the construction of the arch bridge. Its purpose is to eliminate the influence of the inelastic deformation of the foundation and support, check the safety of the support, and ensure construction safety. In the prior art, when preloading the foundation of the arch bridge and the support of the full hall, sandbags or gravel sandbags are usually used for preloading. The sandbags are convenient for lifting and laying, and the sand and gravel can be reused after the preloading is completed; However, when preloading the foundation of the porous arch bridge and the support of the full hall, the preload load is relatively large. If sand bags or gravel s...

AI Technical Summary

Problems solved by technology

In the prior art, when preloading the foundation of the arch bridge and the support of the full hall, sandbags or gravel sandbags are usually used for preloading. The sandbags are convenient for lifting and laying, and the sand and gravel can be reused after the preloading is completed; However, when preloading the foundation of the porous arch bridge and the support of the full hall, the preload load is relatively large. If sand bags or gravel sand bags are used for preloading, the amount of sand or gravel required is large. After the preloading is completed, the sand or gravel cannot be used. Complete internal consumption in the project, and the required sand or gravel bagging, placement, and unloading require a lot of labor, time-consuming and labor-intensive, and there are certain safety hazards through pre-pressing sand bags or gravel sand bags

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