Reinforcement method for foundation of silt soft-based cast-in-place box girder support

Abstract

The invention relates o the technical field of civil engineering and building construction, in particular to a reinforcement method for a foundation of a silt soft-based cast-in-place box girder support. The reinforcement method is characterized by comprising the following steps of: determining parameters->clearing and leveling a ground->measuring the position of an upper structure and laying off a pile position->carrying out high-pressure rotary jet grouting pile construction->curing->carrying out secondary leveling and compacting->chiseling away the top of the pipe by 50cm and rejecting an unoccupied pile head->paving 20cm grading gravels, flattening and compacting->laying steel-plastic grilles->paving a 30cm grading gravel mattress layer->flattening and compacting->pouring a concrete cushion layer. Compared with the prior art, the reinforcement method has the advantages that the respective principle of a combined process is exerted, the cast-in-place beam deformation requirement is satisfied, the construction process is simple and rapid, the cost is low, the safety risk is small, the permanent and temporary combination is realized, and the follow-up input is saved.

Description

[technical field] [0001] The invention relates to the technical field of civil engineering and construction engineering, and mainly relates to a method for reinforcing the foundation of cast-in-place box girder brackets on muddy soft foundations. [Background technique] [0002] With the development of society, in recent years, my country's coastal economically developed areas have gradually expanded their development space to the sea, and made more use of land reclamation methods to make land, give full play to the advantages of being close to ports, and carry out infrastructure construction in newly landed areas. Economic development. The infrastructure construction in the coastal area includes road engineering. When the road crosses structures, prefabricated beams or cast-in-place bridges are mostly used. The bearing capacity of cast-in-place beams is higher than that of prefabricated beams. It has good integrity, high structural rigidity, comfortable driving, and beautiful...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used reinforcement methods for the soft foundation of cast-in-place beam brackets in China include: digging, drying, returning (replacing) and filling method, this process has a large workload, high cost, and long construction period; foundation pile + section steel continuous door opening method, this process is suitable for local door opening application , Large-area application requires continuous disassembly, assembly and transportation of steel components, which increases safety risks, and the transportation of soft foundation parts is inconvenient. The steel pipe pile test pile bearing capacity test was carried out on site. Due to the small span height of the beam, it is necessary to apply the short section in a large area Pipe piles, the cost is high; the mixing pile reinforcement method, the process equipment is heavy, and the construction on the soft foundation needs to lay subgrade box slabs, build access roads, and the applicability is not good; the surface thickening method, the site passes through the mountain stone + lime Loading tests under simulated working conditions with different thicknesses found that this process only strengthened the ground surface and could control the uniform settlement. The absolute settlement within 40 days was greater than 40mm, which did not meet the beam quality control standards

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