A prefabricated subway station rail top air duct structure and construction method

Abstract

The present invention discloses a prefabricated subway station rail top air duct structure and construction method, which includes a multi-section box-type structure unit, wherein the box-type structure unit is assembled by overlapping a plurality of prefabricated components; the box-type structure unit is fixedly connected to the middle plate of the subway station by prestressing steel rods; and adjacent box-type structure units are connected and assembled together by screw rods. When in use, the prefabricated components are assembled into a multi-section box-type structure unit; the box-type structure units are then hoisted one by one to the middle plate installation surface, and after leveling with a pad, they are fixedly connected to the middle plate by prestressing steel rods; and adjacent box-type structure units are connected and assembled together by screw rods, which has high construction convenience, high processing efficiency, convenient and quick disassembly and assembly, high connection strength, short construction period, and low investment cost.

Description

Technical Field

[0001] The invention relates to a prefabricated subway station rail top air duct structure and a construction method, and belongs to the application field of prefabricated components in rail transportation engineering. Background Art

[0002] The subway station track-top air duct is located below the subway station middle plate and above the track. It is a secondary construction structure of the station. At present, this structure is mostly constructed with cast-in-place reinforced concrete. During construction, scaffolding and formwork need to be re-erected. The process is complicated and slow, which wastes a lot of manpower and material resources. In addition, the air duct space is small, and there are great difficulties in the processes of scaffolding, formwork steel, concrete pouring and subsequent frame removal. The construction quality is difficult to guarantee and there are certain quality risks. In addition, during the pouring of the air duct, other subsequent processes will be blocked and stopped, increasing the time cost of the entire track construction.

[0003] There are some prefabricated subway station track-top air duct structures that can effectively increase the construction speed and shorten the construction period of subway station structures. However, the prefabricated air duct is bulky and difficult to operate and install. The connection and fixation between the prefabricated air duct and the subway station middle plate is usually made by pouring concrete, which is time-consuming and laborious. In addition, the installation error is large and the installation quality is poor. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a prefabricated subway station rail top air duct structure and a construction method, which can overcome the shortcomings of the prior art.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A prefabricated subway station rail top air duct structure and construction method, comprising a plurality of box-type structural units, wherein the box-type structural units are assembled by overlapping a plurality of prefabricated components; the box-type structural units are fixedly connected to the middle plate of the subway station by prestressing steel bars; and adjacent box-type structural units are connected and assembled together by screw rods.

[0007] The aforementioned prefabricated components are arranged in various shapes according to the rail top structure of the subway station.

[0008] The aforementioned prefabricated components are a combination of a U-shaped prefabricated structure and an L-shaped prefabricated structure that are overlapped and assembled.

[0009] Connecting holes corresponding to the middle plate are arranged on the top of the aforementioned U-shaped prefabricated structure and L-shaped prefabricated structure, respectively; overlapping edges and card slots matching the overlapping edges are respectively arranged on the inner splicing sides of the bottom; connecting slots are respectively arranged on the outer sides; and transverse through holes are arranged in the connecting slots, so that the card slots on the L-shaped prefabricated structure are buckled on the overlapping edges on the U-shaped prefabricated structure and fastened with bolts, and overlapped and assembled into a box-type structural unit; and each box-type structural unit is connected and assembled together by screws installed on the transverse through holes to form an air duct structure.

[0010] A method for constructing a prefabricated subway station rail top air duct comprises the following steps:

[0011] s1. Use on-site prefabrication to manufacture prefabricated components;

[0012] s2. Opening a plurality of groups of mounting holes on the middle plate of the subway station, wherein the mounting holes correspond to the connection holes of the prefabricated components;

[0013] s3. Horizontally position the middle plate installation surface;

[0014] s4, connecting and assembling the prefabricated components to obtain a multi-section box-type structural unit;

[0015] s5. Use hoisting to lift the box-type structure unit to the middle plate installation surface, so that the box-type structure unit is initially fitted with the middle plate installation surface;

[0016] s6. Perform horizontal adjustment of the box-type structural unit;

[0017] s7. The components are hoisted into place to complete the final fixation of the box-type structural unit;

[0018] s8. Repeat steps s5-s7 to fix the multi-section box-type structural unit on the middle plate installation surface;

[0019] s9. Use screw connection to connect and fix the multi-section box-type structural units to each other;

[0020] s10. Carry out sealing treatment.

[0021] In the above step s2, the hole left after taking out the middle plate reinforcement is used as the installation hole; and then the connection hole on the top of the prefabricated component is opened correspondingly based on the installation hole.

[0022] In the above step s5, a lifting device is arranged on the top surface of the middle plate, and the steel wire rope of the lifting device passes through the mounting hole on the middle plate and is connected to the box-type structural unit, which is lifted to the middle plate mounting surface and is in contact with or close to it.

[0023] The aforementioned lifting equipment is a small winch, and the small winch consists of three pieces arranged in a triangle on the top surface of the middle plate for stable lifting.

[0024] In the aforementioned step s6, the fit between the box-type structural unit and the middle plate installation surface is checked, and a pad is installed in the gap portion for horizontal adjustment.

[0025] In the aforementioned step s10, sealant is applied to all the locations with gaps to perform sealing treatment.

[0026] Compared with the prior art, the present invention discloses a prefabricated subway station track top air duct structure, which is assembled by screwing multiple box-type structural units, and each box-type structural unit is assembled by overlapping multiple prefabricated components; firstly, the assembly of multiple prefabricated components can reduce the volume of the prefabricated mold, which is convenient for production, processing and transportation; secondly, all splicing parts are screwed, which is convenient for installation and has good connection strength. The present invention also discloses a construction method for a prefabricated subway station track top air duct structure, which specifically includes prefabricating a plurality of prefabricated components matching the subway station track top on site; assembling the prefabricated components into multiple box-type structural units; then hoisting the box-type structural units one by one to the middle plate installation surface, leveling them with a pad, and then prestressing and tensioning them with a steel rod to fix them on the middle plate; and adjacent box-type structural units are assembled together by screw connection, which is convenient for construction.

[0027] The beneficial effects of the present invention are:

[0028] 1. Use multiple small prefabricated components for overlap assembly, use small molds, low investment cost, high processing efficiency, good quality, and easy operation, reducing a lot of manpower and material investment.

[0029] 2. Prefabricated components are prefabricated on site, which has the following advantages:

[0030] (1) The prefabrication yard is built within the red line of the subway station construction and does not occupy other areas;

[0031] (2) The construction period is greatly shortened due to the use of prefabrication and assembly technology;

[0032] (3) The rail-top air duct prefabrication production area directly uses the area near the subway station as the rail-top air duct production area, saving site construction costs;

[0033] (4) On-site prefabrication can save component transportation costs and eliminate traffic pressure caused by component transportation;

[0034] (5) The rail-top air duct is transported within the on-site construction enclosure, which does not affect the surrounding traffic, and a two-way one-way channel can be reserved, which is conducive to green construction.

[0035] 3. The installation and splicing parts of the entire air duct structure are all screwed, which is convenient and quick to disassemble and assemble, with high connection strength, short construction period and low investment cost.

[0036] 4. During the installation process, the duct structure is leveled by gaskets, and it fits well with the middle plate installation surface, with good installation reliability, and can ensure the efficiency and smooth progress of subsequent assembly work, with good construction quality and high efficiency.

[0037] 5. After the construction is completed, use sealant to apply sealant to all places with gaps to further ensure the construction quality, long service life and high safety.

[0038] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which:

[0040] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0041] Figure 2 for Figure 1 A partial enlarged schematic diagram of part A in the middle.

[0042] Figure 3 for Figure 2 Schematic diagram of the front structure.

[0043] Figure 4 It is a structural schematic diagram of a box-type structural unit (Example 1).

[0044] Figure 5 It is a structural schematic diagram of a box-type structural unit (Example 2).

[0045] Figure 6 Schematic diagram of the connection structure of the overlapping parts of prefabricated components.

[0046] Figure 7 It is a structural schematic diagram of the U-shaped prefabricated structure.

[0047] Figure 8 This is a schematic diagram of the L-shaped prefabricated structure.

[0048] Fig. 9 This is a schematic diagram of the lifting of the box-type structural unit. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, rather than for limiting the protection scope of the present invention.

[0050] like Figure 1-Figure 9 As shown, a prefabricated subway station rail top air duct structure comprises a multi-section box-type structural unit 1, wherein the box-type structural unit 1 is assembled by overlapping a plurality of prefabricated components; a plurality of connection holes 2 are arranged on the top of the box-type structural unit 1, and steel rods 3 are arranged in the connection holes 2, so that the box-type structural unit 1 is prestressed and tensioned and fixedly connected to the middle plate 4 of the subway station through the steel rods 3; and adjacent box-type structural units 1 are connected and assembled together through screws 5.

[0051] The prefabricated components are arranged in various shapes according to the rail top structure of the subway station. The prefabricated components can be cast by ordinary concrete, with a side wall thickness of 200-250mm, a bottom thickness of 250-300mm, a total height of 1050-1100mm, and a total length of 1500-1600mm. Alternatively, the prefabricated components can also be high-performance concrete, with the same main structure but different wall thicknesses; when high-performance concrete is used, the wall thickness is correspondingly reduced, and the strength remains unchanged.

[0052] Preferably, the prefabricated component can be a combination of a U-shaped prefabricated structure 101 and an L-shaped prefabricated structure 102. The total width of the U-shaped prefabricated structure 101 is 3510-3550 mm; the total width of the L-shaped prefabricated structure 102 is 3490-3500 mm.

[0053] The top of the U-shaped prefabricated structure 101 and the L-shaped prefabricated structure 102 are respectively provided with connection holes 2 corresponding to the middle plate 4, and the inner splicing side of the bottom is respectively provided with a lap edge 1.1 and a slot 1.2 matching the lap edge 1.1, and the outer side is respectively provided with a connection slot 1.3, and the connection slot 1.3 is provided with a transverse through hole 1.4, so that the slot 1.2 on the L-shaped prefabricated structure is buckled on the lap edge 1.1 on the U-shaped prefabricated structure and fastened with bolts 6, and overlapped and assembled into a box-type structure unit 1; and each box-type structure unit 1 is connected and assembled together by a screw 5 installed on the transverse through hole 1.4, so as to be combined into a duct structure. Preferably, a reinforcing structure 7 is provided at the slot 1.2 of the L-shaped prefabricated structure to ensure the reliability of its overlap.

[0054] The steel bar 3 is a PC steel bar of φ16-φ18, the elastic modulus Ep of the PC steel bar is not less than 2.01*105MPa, and the standard tensile strength fpK is not less than 1420MPa.

[0055] The screw 5 is a φ16-φ18 high-strength screw.

[0056] The bolt 6 is a φ16-φ18 high-strength bolt, and the nut 8 corresponding to the high-strength bolt is pre-embedded in the lap 1.1 of the U-shaped prefabricated structure, so that the slot 1.2 of the L-shaped prefabricated structure is buckled on the lap 1.1 of the U-shaped prefabricated structure and locked and fixed with a bolt-nut.

[0057] A method for constructing a prefabricated subway station rail top air duct comprises the following steps:

[0058] s1. Use on-site prefabrication to manufacture prefabricated components;

[0059] s2. A plurality of mounting holes are provided on the middle plate 4 of the subway station, wherein the mounting holes correspond to the connection holes 2 of the prefabricated components;

[0060] s3. Horizontally position the installation surface of the middle plate 4;

[0061] s4, connecting and assembling the prefabricated components to obtain a multi-section box-type structural unit 1;

[0062] s5. Use a hoisting method to lift the box-type structure unit 1 to the installation surface of the middle plate 4, so that the box-type structure unit 1 is initially fitted with the installation surface of the middle plate;

[0063] s6. Performing horizontal adjustment on the box-type structural unit 1;

[0064] s7. The components are hoisted into place to complete the final fixation of the box-type structural unit 1;

[0065] s8, repeat steps s5-s7 to fix the multi-section box-type structural unit 1 on the mounting surface of the middle plate 4;

[0066] s9, the multi-section box-type structural units 1 are connected and fixed to each other by screw connection;

[0067] s10. Carry out sealing treatment.

[0068] In step s1, prefabricated components are produced at a construction site near a subway station to be constructed, and are spliced ​​and assembled on site.

[0069] In step s2, the hole left after taking out the reinforcement of the middle plate 4 is used as the installation hole; and then the connection hole 2 is opened on the top of the prefabricated component corresponding to the installation hole.

[0070] In step s3, the middle plate installation surface is initially horizontally positioned to prepare for the subsequent selection of the backing plate 10.

[0071] In step s4, the prefabricated components are assembled and connected by a forklift at the site below the middle plate 4, and the overlapped joints are tightened and reinforced with high-strength M16 bolts.

[0072] In step s5, a lifting device 9 is arranged on the top surface of the middle plate 4, and the steel wire rope of the lifting device 9 passes through the mounting hole on the middle plate 4 and is connected to the box-type structural unit 1, which is lifted to the mounting surface of the middle plate 4 and is in contact with or close to it.

[0073] The lifting device 9 may be a small winch, and three small winches are arranged in a triangle on the top surface of the middle plate 4 to ensure the stability of the lifting.

[0074] In step s6, the pad 10 is used for level adjustment. Specifically, the fit between the box-type structural unit 1 and the mounting surface of the middle plate 4 is checked, and the pad 10 is installed in the gap. The pad 10 can be a steel plate or a high-strength plastic plate; in the case of a larger gap, a combination of a high-strength plastic plate and a steel plate can also be used. Through level adjustment, the top surface of the box-type structural unit 1 and the mounting surface of the middle plate 4 are ensured to be completely fitted, thereby ensuring the installation quality.

[0075] In step s7, after adjustment, a steel bar tensioning machine is used to tension and lock the steel bars 3 at the diagonals of the box-type structural unit 1, and then the lifting wire rope is removed, and the remaining steel bars 3 are tensioned and locked again by the tensioning machine.

[0076] In step s9, the high-strength screw rod 5 passes through the transverse through hole 1.4 at the side groove of two adjacent box-type structural units 1 to achieve connection and fixation between the box-type structural units 1.

[0077] In step s10, sealant is applied to all the gaps to perform sealing.

[0078] The above description is only a preferred embodiment of the present invention and does not constitute any form of confidentiality restriction on the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A prefabricated subway station rail top air duct structure, characterized by: The invention comprises a plurality of box-type structural units (1), wherein the box-type structural units (1) are formed by overlapping and assembling a plurality of prefabricated components; the box-type structural units (1) are prestressed and tensioned and fixedly connected to a middle plate (4) of a subway station through a steel rod (3); and adjacent box-type structural units (1) are connected and assembled together through screws (5); the prefabricated components are a combination of a U-shaped prefabricated structure (101) and an L-shaped prefabricated structure (102) overlapped and assembled; connection holes (2) corresponding to the middle plate (4) are arranged on the tops of the U-shaped prefabricated structure (101) and the L-shaped prefabricated structure (102), and the inner splicing side of the bottom is divided into The structure is provided with an overlap (1.1) and a slot (1.2) matching the overlap (1.1), and a connection slot (1.3) is provided on the outside. The connection slot (1.3) is provided with a transverse through hole (1.4), so that the slot (1.2) on the L-shaped prefabricated structure is buckled on the overlap (1.1) on the U-shaped prefabricated structure and fastened with bolts (6), and overlapped and assembled into a box-type structural unit (1); each box-type structural unit (1) is connected and assembled together by a screw (5) installed on the transverse through hole (1.4), and is combined into an air duct structure; and a reinforcement structure (7) is provided at the slot (1.2) of the L-shaped prefabricated structure.

2. The prefabricated subway station rail top air duct structure according to claim 1 is characterized by: The prefabricated components are arranged in various shapes according to the rail top structure of the subway station.

3. A method for constructing a prefabricated subway station rail top air duct based on the prefabricated subway station rail top air duct structure according to any one of claims 1 or 2, characterized in that: The following steps are involved: s1. Use on-site prefabrication to manufacture prefabricated components; s2. A plurality of groups of mounting holes are provided on the middle plate (4) of the subway station, wherein the mounting holes correspond to the connection holes (2) of the prefabricated components; s3. Horizontally position the mounting surface of the middle plate (4); s4, connecting and assembling the prefabricated components to obtain a multi-section box-type structural unit (1); s5. The box-type structural unit (1) is hoisted to the installation surface of the middle plate (4) by hoisting, so that the box-type structural unit (1) is initially fitted with the installation surface of the middle plate; s6. Performing horizontal adjustment on the box-type structural unit (1), checking the fit between the box-type structural unit (1) and the mounting surface of the middle plate (4), and installing a pad (10) at the portion with a gap to perform horizontal adjustment; s7. The components are hoisted into place to complete the final fixation of the box-type structural unit (1); s8, repeating steps s5-s7 to fix the multi-section box-type structural unit (1) on the mounting surface of the middle plate (4); s9, using a screw connection method to connect and fix the multiple box-type structural units (1) to each other; s10. Carry out sealing treatment.

4. The method for constructing a prefabricated subway station rail top air duct according to claim 3, characterized in that: In step s2, the hole remaining after the steel bars of the middle plate (4) are removed is used as the installation hole; and then a connection hole (2) is opened at the top of the prefabricated component corresponding to the installation hole.

5. The method for constructing a prefabricated subway station rail top air duct according to claim 3, characterized in that: In step s5, a lifting device (9) is arranged on the top surface of the middle plate (4), and a steel wire rope of the lifting device (9) passes through the mounting hole on the middle plate (4) and is connected to the box-type structural unit (1), and is lifted to the mounting surface of the middle plate (4) and is fitted or close to it.

6. The method for constructing a prefabricated subway station rail top air duct according to claim 5, characterized in that: The lifting device (9) is a small winch, and the small winch consists of three parts arranged in a triangle on the top surface of the middle plate (4) for stable lifting.

7. The method for constructing a prefabricated subway station rail top air duct according to claim 3, characterized in that: In step s10, sealant is applied to all the gaps to perform sealing.

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