A construction method for the foundation of a large-scale arch bridge with permeable geology

Abstract

The invention discloses a construction method of a permeable geological large-scale arch bridge foundation, which is characterized in that it includes the following steps: building an island cofferdam → building a sidewalk → constructing a reinforced concrete occlusal pile → constructing a high-pressure grouting water-stop curtain and simultaneously injecting the base in the foundation pit Slurry construction → water-stop curtain construction of rotary grouting pile → construction of crown beam and first inner support beam → excavation to the elevation of second inner support beam → construction of waist beam and second inner support beam → excavation to third inner support beam Elevation and the construction of the inner support beam of the third floor → excavation to the design base → construction of the abutment foundation and removal of the inner support layer by layer → backfilling of the foundation pit; the construction method of the present invention has fast construction progress, stable construction quality, and water-stop curtain outside the pit A closed anti-seepage structure layer is formed on the outside of the foundation pit. At the same time, the high-pressure rotary grouting piles on the top compact the outer soil layer of the supporting piles, further strengthening the outer soil layer of the foundation pit, and effectively preventing the landslide of the cofferdam caused by flood erosion. and collapse; in addition, the special-shaped steel cage saves concrete materials.

Description

technical field [0001] The invention relates to the technical fields of architectural design and building construction, in particular to a construction method for a large-scale arch bridge foundation with permeable geological features. Background technique [0002] With the rapid development of my country's economy and the expansion of infrastructure construction, and the development of bridges across rivers and rivers, the scale of deep foundation pit projects in water is getting larger and larger, and the excavation depth is getting deeper and deeper. When there are buildings around the deep foundation pit, The protection of buildings poses many technical problems to the engineering community. In order to improve efficiency, shorten the construction period, protect the environment, save energy and reduce emissions, and ensure the quality and performance of the structures in the permeable deep foundation pit, and promote the better development of foundation pit foundation en...

AI Technical Summary

Problems solved by technology

In order to improve efficiency, shorten the construction period, protect the environment, save energy and reduce emissions, and ensure the quality and performance of the structures in the permeable deep foundation pit, and promote the better development of foundation pit foundation engineering, reinforced concrete occlusal pile + water-stop curtain comprehensive support construction It is already the development trend of permeable deep foundation pit protection construction; in the existing construction technology, the construction of permeable geology needs to prevent large-scale loose soil, and the problem of engineering oversquare is prone to occur after excavation. The occurrence of base water gushing and seepage; the protection of the water-stop curtain outside the foundation pit is not enough; in addition, during the excavation of the foundation pit, safety accidents such as foundation pit collapse often occur due to technical and other reasons; in addition, the existing reinforced concrete The water stop of the foundation pit of the occlusal pile is made of the same type of cylindrical reinforced concrete pile as the water stop curtain. There are certain defects in positioning, water isolation and preventing soil collapse. The reinforced concrete pile and the pile are docked. The quality of joints cannot be guaranteed, the operation is cumbersome, time-consuming and labor-intensive, and the construction speed is slow. The quality of the joint between piles is not good, and concrete raw materials are wasted.

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