Plate lowering construction method for underground structure in reverse construction method

Abstract

The invention discloses a plate lowering construction method for an underground structure in a reverse construction method. The plate lowering construction method comprises the following steps: underground guide grooves and underground diaphragm walls are constructed firstly, then stand column piles are constructed, a crane frame and a crane are mounted, and precast beam plates with each layer being of an overall structure are placed in a superimposed mode and fixed through the crane; and then the precast beam plates are sequentially lowered layer by layer by the crane, construction of all theprecast beam plates is completed, in the lowering process of the precast beam plates, through a plurality of pairs of laser range finders and targets arranged on the vertically-adjacent precast beamplates, whether the precast beam plates are oblique or not is monitored, a servo mechanism of the crane is controlled through a control terminal, the lowering speed of the crane is adjusted, and thusstable lowering of the precast beam plates is ensured. By adopting the construction method, a reverse construction plate lowering method construction technology is combined with a prefabricated construction technology, construction is easy, convenient, more efficient, stable and safe, and the construction equality is guaranteed.

Description

technical field [0001] The invention relates to a construction method for lowering slabs of an underground structure in an upside-down method, belonging to the technical field of building construction. Background technique [0002] At present, most of the underground structures are constructed by the upside-down method, that is, the underground structures are constructed layer by layer from top to bottom. Moreover, the floor slabs and beams of the underground structures are all cast-in-place construction methods. This construction method has the following defects: [0003] 1. Due to the relatively closed and narrow interior of the construction site, the construction of cast-in-place structures faces difficulties such as inconvenient erection of formwork supports and difficulty in formwork support, making it difficult to guarantee the construction quality; moreover, the exhaust gas of mechanical equipment in the narrow space is concentrated, and the dissipation speed of toxic ...

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Problems solved by technology

[0003] 1. Due to the relatively closed and narrow interior of the construction site, the construction of cast-in-place structures faces difficulties such as inconvenient erection of formwork supports and difficulty in formwork support, making it difficult to guarantee the construction quality; moreover, the emission of exhaust gas from mechanical equipment in the narrow space is concentrated, and the dissipation speed of toxic gases is slow. Directly threaten the safety of construction workers;

[0004] 2. The erection of formwork supports for cast-in-place structures requires a large amount of steel and wood. Except for B0 slabs, the formwork, steel bars, and scaffolding required for the construction of beam-slab structures on all underground floors must be transported through the reserved narrow soil intake. The efficiency is low, and the materials will inevitably be damaged and consumed during transportation;

[0005] 3. After the concrete pouring of the underground structure is completed, it needs to be cured for a period of time before it can form its strength. Since the underground beam-slab structure in the reverse method is used as a permanent structural beam-slab and also serves as a temporary horizontal support, it is necessary to wait after the construction of each floor slab is completed. After curing to the design strength, the next step of construction can be carried out, and the concrete curing time takes up a lot of construction time, which reduces the construction efficiency

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