Single-layer three-dimensional prefabrication with excavation of foundation pit and assembly of sunken construction ladder and construction method

Abstract

The invention relates to a single-layer three-dimensional prefabricated sunken construction ladder stand assembled along with excavation of a foundation pit and a construction method. The ladder stand is formed by assembling ladder stand main structures, namely a plurality of single-layer ladder stand bodies, a vertical stabilization mechanism and a smooth sinking mechanism. The ladder stand main structures are the multi-layer integral ladder stand through connecting and assembling of single-layer three-dimensional steel ladder stand prefabricated components, connecting pipes located on the four corners of the side elevation of the steel ladder stand and inner penetration bolts. The vertical stabilization mechanism is formed by meshing guide rails fixed to the upper end of the side elevation of an even wall and sliding rails fixed to the side elevation of the ladder stand. The stable sinking mechanism is composed of lifting beams welded to guide rail bases, manual blocks hung on the lifting beams, and a lifting nose arranged on the ladder stand. According to the single-layer three-dimensional prefabricated sunken construction ladder stand assembled along with the excavation of the foundation pit and the construction method, in the groove excavating process, the prefabricated steel ladder stand is installed in a whole layer successively in a time section dividing mode, as the foundation pit is constantly deepened, the ladder stand stably sinks by itself through a sinking lifting beam device assembled on the ladder stand, an upper channel and a lower channel can be constructed in the deep foundation pit fast, conveniently and economically, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to the manufacture and installation of a construction ladder for deep foundation pit excavation in underground engineering, in particular to a single-layer three-dimensional prefabricated construction ladder and a construction method that is assembled with the excavation of the foundation pit and sinks. Background technique [0002] At present, with the continuous development of urban and rural construction, the scale and complexity of underground projects such as subways, underground tunnels, and underground parking lots are increasing; For about one to two years, it has become the main feature of large-scale deep foundation pit construction, especially reverse construction. In the construction of deep underground projects, in order to ensure the smooth flow of the upper and lower construction passages and the safety of the construction personnel, a single-layer prefabricated and assembled steel ladder has appeared; but this stee...

AI Technical Summary

Problems solved by technology

In the construction of deep underground projects, in order to ensure the smooth flow of the upper and lower construction passages and the safety of the construction personnel, a single-layer prefabricated and assembled steel ladder has appeared; but this steel ladder can only be used after the foundation pit is excavated , and then stacked from the bottom to the top; in the dynamic process of earthwork excavation and base elevation deepening, scaffolding steel pipes can only be used to erect temporary ladders as vertical construction passages, which have small rigidity and large deformation, which is inconvenient Workers carry tools and materials to pass up and down, or temporarily set up crude ladders on the pit wall during the excavation of the foundation pit; this not only poses safety hazards, but also makes it difficult to meet the needs of construction speed

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