Construction method of large-scale arch bridge foundation on water-permeable geology

Abstract

The invention discloses a construction method of a large-scale arch bridge foundation on the water-permeable geology. The construction method of the large-scale arch bridge foundation on the water-permeable geology is characterized by comprising the following steps of conducting island and cofferdam construction, constructing a shortcut, constructing reinforced concrete secant piles, conducting high-pressure grouting waterproof curtain construction and foundation pit inner basement grouting construction at the same time, constructing a jet grouting pile waterproof curtain, constructing a top beam and a first inner support beam, conducting excavation to the elevation of a second inner support beam, constructing a waist rail and the second inner support beam, conducting excavation to the elevation of a third inner support beam and constructing a third-layer inner support beam, conducting excavation to the designed basement, constructing an arch support foundation and detaching inner support layer by layer and backfilling the foundation pit. According to the construction method, the construction progress is rapid, the construction quality is stable, the waterproof curtain outside thepit enables the outer side of the foundation pit to form an annular closed seepage-proof structure layer; and meanwhile, the high-pressure jet grouting piles on the top enable the soil layer outside support piles to be hardened, the soil layer outside the foundation pit is further strengthened, and the situation that the cofferdam landslides and collapses due to flood scouring is effectively prevented. In addition, a special-shaped steel reinforcement 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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