Top-down construction method for intermediately-weathered geology

Abstract

The invention discloses a top-down construction method for intermediately-weathered geology. According to the top-down construction method for the intermediately-weathered geology, support piles and high-pressure rotary jet water-stopping curtains are constructed first of all, and meanwhile concrete-filled steel tube stand column piles are arranged at corresponding positions according to design and used as the bearing support during construction; dewatering engineering construction is conducted, earth cutting is conducted above the earth cutting bottom elevation line of a first floor underground, after earth cutting reaches the stipulated depth bottom elevation, a concrete cushion is poured, and then column, beam and slab structures above the earth cutting bottom elevation line of the first floor underground are constructed, and beams and slabs are used as the horizontal support system of a retaining structure; and then earth excavation and pouring of the beam, slab and column structures of each floor are conducted in floor-by-floor and downward manners until bottom sealing of a raft foundation is conducted. By the adoption of the top-down construction method for the intermediately-weathered geology, construction is convenient, rapid, economical and environmentally friendly, the safety of a foundation pit and a pipeline is guaranteed, and the underground space can be utilized to the greatest extent.

Description

Technical field: [0001] The invention relates to an upside-down construction method, in particular to an upside-down construction method for moderately weathered geology. Background technique: [0002] With the continuous development of urban construction, the underground space is more and more fully utilized, and the number of underground construction projects in urban areas with many high-rise buildings is also increasing. For the protection requirements, the sequential method shows obvious deficiencies, so many projects choose to use the reverse method for construction. The upside-down construction method can use the floor structure as internal support to avoid the intervention of anchor cables in the surrounding underground space, improve the safety of underground engineering, save project cost, shorten the construction period, and reduce the subsidence of surrounding foundations. Since the construction of the reverse method is greatly affected by the engineering geolog...

AI Technical Summary

Problems solved by technology

Since the construction of the reverse method is greatly affected by the engineering geological conditions, most of the projects using the reverse method at the present stage are located in the muddy areas in the south, and are rarely used in moderately weathered geology. The existing construction methods are mainly suitable for the construction of the muddy soil layer and cannot be applied Construction in weathered geology

In the moderately weathered rock strata, how to avoid the adverse impact of rock breakage on the upright piles, resulting in a decrease in the bearing capacity of the upright piles, is an urgent problem to be solved

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