Prefabricated rail top air duct for metro station and construction method of air duct

Abstract

The invention provides a prefabricated rail top air duct for a metro station and a construction method of the air duct, belongs to the technical field of constructional engineering, and relates to a construction method for constructing of the metro station prefabricated rail top air duct, simultaneous constructing of the metro station prefabricated rail top air duct and a cast-in-place middle plate, rear hanging constructing of the metro station prefabricated rail top air duct and the cast-in-place middle plate, and simultaneous constructing of the metro station prefabricated rail top air ductand a prefabricated overlapped middle plate. The prefabricated rail top air duct for the metro station comprises two side plates and a bottom plate which are integrally formed into a U-shaped structure. Reinforcing steel bars are arranged at the upper portions of the two side plates. Detachable supporting structures are further arranged at the upper portions of the two side plates. Each supporting structure is a combination of a timber formwork and structural steel. The two side plates, the bottom plate and the supporting structures form the port of the air duct. One face of the port of the air duct is provided with a concave opening. The prefabricated rail top air duct has the advantages that no secondary civil engineering construction is needed, the structural steel for construction canbe recovered, the weight is light, and the sealing effect is good.

Description

technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method for simultaneous construction of a prefabricated rail top air duct of a subway station and a cast-in-place mid-slab, rear-hanging construction with a cast-in-place mid-slab, and simultaneous construction with a prefabricated laminated mid-slab. Background technique [0002] The construction of the rail top air duct in the subway station mainly adopts the traditional construction method of non-prefabricated cast-in-place concrete technology. This construction method has a low degree of industrialization, relatively extensive design and construction, unstable product quality, low construction efficiency, and labor demand. Large amount of material loss and construction waste, large resource and energy consumption, cannot meet the sustainable development construction requirements of energy saving and environmental protection. In term...

AI Technical Summary

Problems solved by technology

[0003] (1) The clearance height of the air duct on the top of the rail is less than 1 meter, so it is very difficult to erect formwork and bind steel bars;

[0004] (2) It is difficult to pour the hanging wall of the air duct on the top of the rail, and it is difficult to pour it densely. For the top-hung screen door, the positioning of the air duct civil construction is required to be controlled within 10mm. If the construction accuracy cannot be achieved, the rectification is particularly difficult;

[0005] (3) After the construction of the main structure inside the station is completed, the secondary structural construction of the rail top air duct needs to be carried out, and the civil engineering needs to enter the site again. At the same time, the electromechanical installation, station decoration and track construction also enter the site, and there will be cross operations, which will affect the construction period of the whole line

[0007] (1) The key connection nodes under permanent force are connected by steel structure, which has the problem of anti-corrosion and fire prevention, and the later maintenance cost is high;

[0008] (2) The prefabricated rail top air duct does not consider the longitudinal connection, and the airtightness cannot be guaranteed;

[0009] (3) The component weight of the ordinary concrete prefabricated rail top air duct is too heavy, and the construction is difficult;

[0010] (4) Secondary civil work is still required, and the construction efficiency has not been improved;

[0011] (5) It is necessary to drill holes in the middle plate to hang the prefabricated air duct for installation, and the construction accuracy is not high

[0013] Patent Notice No. CN 207750094 U "A Whole Prefabricated Rail Top Air Duct Assembly Structure of Metro Station" discloses a structure of prefabricated rail top air duct, but the connection structure of this kind of rail top air duct is the connection mode of pre-embedded bolt holes. During the process, the bolts are in contact with the air, which will cause the bolts to corrode and fall off for a long time, and it is not easy to resist fire, which has certain potential safety hazards

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