Beam lowering construction method for underground structure in reverse construction method

Abstract

The invention discloses a beam lowering construction method for an underground structure in a reverse construction method. The beam lowering construction method comprises the following steps that an underground guide groove and an underground diaphragm wall are constructed, then upright piles are constructed, a crane frame and a crane are mounted, precast beams of which each layer is of an integral structure are superposed, and the precast beams are fixed through the crane; and then the beams are sequentially lowered layer by layer, construction of all the precast beams is completed, and a large bottom plate and floor plates of all layers are sequentially constructed from bottom to top. By adopting the construction method, lighting and ventilation are not affected in the construction process, the construction difficulty is lowered, the construction efficiency is improved, meanwhile, a reverse beam lowering construction technology and a prefabricated construction technology are combined, construction is easy, convenient, more efficient, more stable and safer, and the construction quality is guaranteed.

Description

technical field [0001] The invention relates to a beam lowering construction method of an underground structure in an upside-down method, and belongs to the technical field of building construction. Background technique [0002] In the existing upside-down construction technology, the underground structure can be constructed layer by layer or prefabricated lower slab construction with prefabricated whole floor slabs. Both of these methods require top-down construction of each floor slab structure, so there are the following problems: [0003] 1. During the construction of the reverse method, the construction of the substructure adopts a top-down sequence of pouring beam-slab structures layer by layer. During the construction of each layer, only a narrow soil intake is connected to the ground, and the construction site is relatively closed and narrow; [0004] 2. When the cast-in-place structure is used for construction, in a relatively closed space, there will be problems su...

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Problems solved by technology

[0004] 2. When the cast-in-place structure is used for construction, in a relatively closed space, there will be problems such as inconvenient erection of formwork supports and difficulty in formwork support. The construction is difficult, the construction quality is not easy to guarantee, and a large amount of steel and wood are consumed, resulting in waste of resources ; At the same time, the relatively closed space leads to poor air circulation and insufficient lighting, which threatens the safety of construction personnel; moreover, the maintenance of cast-in-place structures takes up a lot of construction time and reduces construction efficiency;

[0005] 3. When the prefabricated lowering slab construction system is adopted, each floor and beam are prefabricated as a whole, which is huge in volume and weight. The requirements for the required transportation, lifting and auxiliary lowering slab construction equipment are relatively high. At the same time, the overall lowering slab hoisting requires extremely high construction accuracy. Increased the difficulty of construction

[0006] In short, the existing upside-down underground structure construction system needs to be constructed in a narrow construction space. The air circulation is unfavorable, the lighting is insufficient, and the construction space environment is harsh. At the same time, it cannot take into account the difficulty of construction and construction efficiency. method to solve the above problems

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