Top-down decreasing-formwork formwork system and construction method

Abstract

The invention discloses a top-down decreasing-formwork formwork system and a construction method thereof, wherein the decreasing-formwork formwork system comprises a main beam, a secondary beam and a formwork fixed on the secondary beam; and the formwork is pre-provided with a column hole for being passed through by a structural column at the position of the structural column. The formwork system is characterized by also comprising a hanger rod and a chain hoist; the hanger rod is of a matrix structure and vertically arranged on the whole decreasing-formwork formwork system; the lower end of the hanger rod is fixedly connected to the main beam; the length of the hanger rod is larger than the floor height of a basement structure; the hanger rod is provided with a lifting nut; and the suspension point of the chain hoist is arranged at the hanger rod position of the surrounding of a post cap. The formwork system takes the firstly completed structure as the reacting force point of the lower structure construction, and falls off layer by layer along the construction process, thus being capable of effectively reducing the overexcavation depth, canceling the cushion coat, avoiding the waiting time for concrete curing, being very beneficial to the control on the surrounding environment, and speeding up the top-down construction.

Description

technical field [0001] The invention belongs to the field of construction engineering formwork manufacturing technology, and relates to a formwork system for constructing a beam-slab floor structure by an upside-down method, in particular to an upside-down formwork lowering formwork system and a construction method for upside-down construction using the formwork. Background technique [0002] The reverse method is a new foundation pit support technology developed in recent years. It is an effective method for constructing multi-storey basements of high-rise buildings and other multi-storey underground structures. Construction of underground diaphragm walls or other supporting structures along the axis of the basement of the building or around it, and at the same time pouring or laying down intermediate support piles and columns at relevant positions inside the building, as a support for bearing the self-weight and construction load of the upper structure before the bottom pl...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a reverse formwork lowering formwork system that has good construction continuity, fast construction progress, and can effectively complete beam and slab floor pouring with only a small over-excavation depth, so as to overcome the disadvantages of existing technologies. The reverse construction has defects such as large over-excavation depth, unfavorable environmental control, poor construction continuity, and slow construction speed.

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