Long-span reinforced concrete inner support structure of rectangular deep foundation pit and construction method of structure

Abstract

The invention discloses a long-span reinforced concrete inner support structure of a rectangular deep foundation pit, which comprises a foundation pit edge breast wall retaining structure, a plurality of layers of inner support three-dimensional timbering structures with steel structure support columns, and a top beam, wherein each inner support three-dimensional timbering structure comprises a foundation pit corner part structure, a foundation pit middle part symmetrical and opposite support structure, and longitudinal beams; each foundation pit middle part symmetrical and opposite support structure comprises a cross beam and two small inclined struts positioned at the two ends of the cross beam; the longitudinal beams are beams which are parallel to long edges of the foundation pit and are positioned at the middle part of the foundation pit; the steel support columns directly reach below the bottom of the foundation pit; the bottoms of the steel structure support columns are anchored by placed concrete; ring beams are arranged at parts where the cross beams, the longitudinal beams and the steel structure support columns at the middle part of the foundation pit are intersected; a support waist beam is arranged at a connection part between the inner support three-dimensional timbering structure and the middle part of the foundation pit edge breast wall retaining structure; and the cross beams, longitudinal beams, the ring beams and the waist beam of the inner support three-dimensional timbering structure are reinforced concrete or combined type large steel frame structures. The inner support structure is simple and visual in design, convenient to construct, large in support span, and significant in timbering effect.

Description

technical field [0001] The invention relates to a comprehensive support technology for foundation pits, in particular to a comprehensive support technology for large deep foundation pits with narrow surrounding sites and soft soil foundations. Background technique [0002] With the rapid development of the economy, the building height continues to increase, and the requirements for the foundation depth and space utilization rate of the project are also increased; and the basement depth is greater than 20 meters; the muddy deep foundation pit; the surrounding adjacent buildings, underground Pipelines, roads, etc. The original single support forms such as soil nail support, bolt or spray anchor support, steel plate column support and even underground diaphragm wall can no longer meet the needs of construction, and it is difficult to reach the horizontal and vertical two-way in the foundation pit. force balance. [0003] The authorized announcement number is CN202718129U, and...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rectangular deep foundation pit large-span reinforced concrete internal support structure, which solves the problem that the support form in the deep foundation pit support in the prior art is single, and it is difficult to reach the horizontal and vertical two-way force balance in the foundation pit The problem

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