Existing railway platform heightening beam plate fabricated structure and construction method thereof

Abstract

The invention relates to an existing railroad platform heightening beam plate assembly type structure and a construction method, and the existing railroad platform heightening beam plate assembly type structure comprises a prefabricated reinforced concrete cover plate, prefabricated I-shaped beam reinforced concrete heightening modules and a bottom grouting layer; the prefabricated reinforced concrete cover plate is formed by sequentially splicing a plurality of adjacent line cover plate units on the two sides and a middle cover plate unit in the middle. The two sides of the bottom of the prefabricated I-beam reinforced concrete heightening module are each provided with at least two height-adjustable supports. The prefabricated I-beam reinforced concrete heightening modules are arranged below the adjacent line cover plate units and the middle cover plate units, shear keys at the upper ends of the prefabricated I-beam reinforced concrete heightening modules are inserted into shear grooves in the lower sides of the line cover plate units and shear grooves in the lower sides of the middle cover plate units to form connection, and the bottoms of the prefabricated I-beam reinforced concrete heightening modules are connected with a grouting layer through height-adjustable supports. Under the condition that the original platform surface is uneven, rapid leveling can be achieved, the time for waiting for the concrete to reach the strength is saved, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to an existing railway platform heightening beam and slab assembly structure and a construction method. Background Art

[0002] According to the national railway industry specifications, the height difference between the platform and the train door step must meet strict boundary parameters. With the intelligent upgrade of my country's railway network and the iteration of EMU models, the need to adjust the height of existing station platforms is becoming increasingly urgent. Traditional platform height increase mostly uses cast-in-place concrete structure, but there are the following defects: First, cast-in-place construction requires a closed working area, a long construction period, a great impact on the station environment, and seriously reduces the station's operating efficiency and passenger travel experience; second, once the cast-in-place structure solidifies, it loses its height adjustment ability and cannot adapt to possible changes in vehicle formations in the future; third, shrinkage cracks are prone to occur at the interface between the new and old concrete, and the structural integrity is poor.

[0003] Although the existing public prefabricated platform structures can shorten the construction period to a certain extent, they generally lack systematic standard designs, the prefabricated modules have complex shapes, low structural matching with existing platforms, and difficulty in on-site adaptability adjustment and cutting. For example, a prefabricated and assembled railway platform structure disclosed in the Chinese patent with application number CN201922321023.3 uses box-type reinforced concrete prefabricated blocks as the main structure of the platform height increase, a concrete cushion layer is set at the bottom, and the prefabricated structural modules are arranged and connected with staggered seams. However, this scheme still faces two major problems: on the one hand, the installation of the prefabricated structure must wait until the cast-in-place concrete cushion layer reaches the design strength before it can be carried out, which significantly prolongs the construction period and restricts the overall project progress; on the other hand, the scheme still uses standard box-shaped modules in the middle area of ​​the platform, lacks flexibility and adaptability in complex structural locations such as canopy columns and equipment foundations, and is difficult to meet actual construction requirements and functional requirements. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an existing railway platform heightening beam and slab assembled structure, which can avoid the problems of low construction efficiency and complicated procedures of cast-in-place operations, while improving the flexibility and stability of the assembled structure.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: An existing railway platform heightening beam and slab assembly structure comprises a prefabricated reinforced concrete cover plate, a prefabricated I-beam reinforced concrete heightening module, and a bottom grouting layer; the prefabricated reinforced concrete cover plate is formed by sequentially splicing a plurality of adjacent line cover plate units on both sides and an intermediate cover plate unit in the middle; three shear grooves are arranged on the lower side of the adjacent line cover plate unit, two shear grooves are arranged on the lower side of the intermediate cover plate unit, two shear keys are arranged on the upper end of the prefabricated I-beam reinforced concrete heightening module, and at least two height-adjustable supports are arranged on both sides of the bottom; The prefabricated I-beam reinforced concrete heightening module is arranged below the adjacent line cover unit and the intermediate cover unit. The shear key at the upper end of the prefabricated I-beam reinforced concrete heightening module is inserted into the shear groove on the lower side of the line cover unit and the shear groove on the lower side of the intermediate cover unit to form a connection, and the bottom is connected to the grouting layer through a height-adjustable support.

[0006] Preferably, the prefabricated I-beam reinforced concrete heightening module has a longitudinal length of 3000 mm, and the adjacent line cover plate unit extends outward by 250 mm on the adjacent line side.

[0007] Preferably, there are gaps between the longitudinally arranged prefabricated I-beam reinforced concrete heightening modules, and the longitudinally adjacent webs are connected by filling with micro-expansive concrete or elastic material.

[0008] Preferably, the height-adjustable support is composed of a bottom gasket and an adjusting bolt, and the adjusting bolt can be adjusted up and down within an adjustment range of 50 mm.

[0009] Preferably, a locking nut is provided on the adjusting bolt, and after the adjustment is completed, the bottom gasket is locked on the adjusting bolt by the locking nut to fix the height.

[0010] Preferably, a rib is longitudinally provided on one edge of the top of the adjacent line cover plate unit adjacent to the line.

[0011] Preferably, the end joints of the adjacent line cover plate units and the middle cover plate units are filled with elastic sealant or cement-based grouting material, and expansion joints are provided every 4-6 m along the longitudinal direction of the platform.

[0012] Preferably, the bottom grouting layer is cast in sections using micro-expansive concrete.

[0013] The construction method of the above-mentioned existing railway platform heightening beam and slab assembled structure comprises the following steps: S1, precast concrete cover plate and precast I-beam reinforced concrete heightening module; S2. Roughen the original platform surface, locate the installation position of the prefabricated I-beam reinforced concrete heightening module on the existing platform according to the design elevation, and mark the axis and the support points of the height-adjustable bearings; S3. Hoist the prefabricated I-beam reinforced concrete heightening module to the marked position, rotate the bottom gasket to adjust the module height, and check the elevation of the top surface of each module. The adjacent heightening modules are connected by filling the reserved gaps between the webs with micro-expansion concrete or elastic materials; S4, closing the bottom of the prefabricated I-beam reinforced concrete heightening module around the periphery, and pouring micro-expansion concrete in sections to form a bottom grouting layer; The adjacent cover plate unit and the middle cover plate unit of the precast reinforced concrete cover plate are hoisted to the top of the precast I-beam reinforced concrete heightening module in turn, the shear keys are embedded in the shear grooves, elastic sealant or cement-based grouting material is filled in the longitudinal joints of the cover plate units, and cement-based grouting material is pressure-injected in the gap between the precast reinforced concrete cover plate and the precast I-beam reinforced concrete heightening module; a leveling layer is poured on the surface of the cover plate, and floor tiles are laid.

[0014] The beneficial effects of the present invention are as follows: the present invention adopts prefabricated I-beam reinforced concrete heightening modules and cover plates as the main structure, which has good bearing capacity and seismic resistance, and the modular design is convenient for factory production and on-site installation; the shear grooves and shear keys are easy to assemble, and the structural integrity and lateral displacement resistance can be improved; the platform height can be accurately adjusted by the height-adjustable support, and the original platform surface can be quickly leveled when it is uneven, eliminating the construction process of leveling the original platform surface, and the construction is more convenient; during the construction, the method of placing the prefabricated reinforced concrete heightening module first and then grouting the bottom is adopted. Compared with first pouring the cushion layer and then placing the prefabricated reinforced concrete heightening module, the time of waiting for the concrete to reach the strength is eliminated, and the construction efficiency is improved; when a canopy column is provided in the middle of the original platform, the surrounding cover plates can be cut as needed to meet the strength requirements and embedded around the canopy column. Compared with the wet construction, this treatment method can greatly improve the construction efficiency; the retaining edge of the adjacent line cover plate unit can effectively limit the lateral deformation of the platform surface tiles, thereby improving the safety of railway platform operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the prefabricated structure for raising the height of the existing railway platform beams and slabs.

[0016] Figure 2 Schematic diagram of the structure of reinforced concrete cover slab.

[0017] Figure 3 This is a schematic diagram of the structure of the prefabricated I-beam reinforced concrete heightening module.

[0018] Figure 4 Schematic diagram of a height-adjustable support. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited to the following description.

[0020] The present invention provides an existing railway platform heightening beam plate assembly structure, such as Figures 1 to 4 As shown, it includes a prefabricated reinforced concrete cover plate 1, a prefabricated I-beam reinforced concrete heightening module 2 and a bottom grouting layer 3. The prefabricated reinforced concrete cover plate 1 is composed of a plurality of adjacent cover plate units 4 on both sides and an intermediate cover plate unit 5 in the middle, which are sequentially spliced ​​together; three shear grooves 41 are provided on the lower side of the adjacent cover plate unit 4, and two shear grooves 51 are provided on the lower side of the intermediate cover plate unit; two shear keys 21 are provided on the upper end of the prefabricated I-beam reinforced concrete heightening module 2, and at least two height-adjustable supports 22 are provided on both sides of the bottom; in this embodiment, three adjustable supports 22 are provided on each side.

[0021] The prefabricated I-beam reinforced concrete heightening module 2 is arranged below the adjacent line cover unit 4 and the intermediate cover unit 5. The shear key 21 at the upper end of the prefabricated I-beam reinforced concrete heightening module is inserted into the shear groove 41 on the lower side of the line cover unit 4 and the shear groove 51 on the lower side of the intermediate cover unit 5 to form a connection, and the bottom is connected to the grouting layer 3 through a height-adjustable support 22.

[0022] In the present invention, a longitudinal retaining edge 42 with a height of 50mm is provided on the adjacent line side of the adjacent line cover plate unit 4, and three shear grooves 41 with a depth of 80mm and a groove width of 120mm are reserved at the bottom; two shear grooves 51 are provided at the bottom of the intermediate cover plate unit 5, and the groove size is the same as that of the adjacent line cover plate unit. After the adjacent line cover plate unit 4 and the intermediate cover plate unit are spliced ​​in sequence, elastic sealing material or cement grouting material is poured at the connecting gaps of adjacent cover plate units to form a fixed connection. In order to adapt to the expansion and contraction caused by temperature changes, an expansion joint is set every 4-6m along the longitudinal direction of the platform and filled with elastic material.

[0023] The longitudinal length of the prefabricated I-beam reinforced concrete heightening module 2 is 3000mm, the web height is the platform net height minus the cover thickness and the bottom grouting layer thickness, the web thickness is generally 180-220mm, the flange width is 300-500mm, the flange thickness is 150-200mm, and the specific size and reinforcement are designed according to the platform load requirements; the outer side of the flange on the line side extends 250mm, which is convenient for cutting and adjustment according to the actual line conditions to improve adaptability; considering the setting of platform settlement joints and convenient grouting, segmented construction is carried out during construction. Every 8 prefabricated I-beam reinforced concrete heightening modules 2 placed along the longitudinal direction of the platform are a construction section, and the longitudinal length of each construction section is 24m.

[0024] like Figure 1 As shown, longitudinally adjacent prefabricated I-beam reinforced concrete heightening modules 2 are connected by filling the gaps reserved in the webs with micro-expansive concrete or elastic material.

[0025] like Figure 4 As shown, the height adjustable support 22 is composed of a bottom gasket 221 and an adjusting bolt 222. By rotating the bottom gasket, a height adjustment range of 50 mm can be achieved to meet the platform leveling requirements.

[0026] like Figure 4 As shown, a locking nut 223 is provided on the adjusting bolt 222. After the adjustment is completed, the bottom gasket 221 is locked on the adjusting bolt 222 by the locking nut 223 to fix the height.

[0027] The construction method of the existing railway platform heightening beam and slab assembly structure provided in this example includes the following steps: S1. Prefabricated reinforced concrete cover plate 1 and prefabricated I-beam reinforced concrete heightening module 2 according to design requirements; S2. Treatment of the existing platform foundation: roughen the original platform surface and wash the base surface with a high-pressure water gun to ensure that there is no oil or dust; S3. Installation and leveling of prefabricated I-beam reinforced concrete heightening modules 2: according to the design elevation and the plan layout, the module axis is marked on the platform foundation, and the support point of the height-adjustable support 22 is marked; the prefabricated I-beam reinforced concrete heightening modules 2 are hoisted to the predetermined position using professional hoists; the adjustable support 22 is adjusted to adjust the elevation of the top surface of each module to the design height; the adjacent prefabricated I-beam reinforced concrete heightening modules 2 are connected by filling the reserved gaps on the web with micro-expansion concrete or elastic materials; S4, construction of bottom grouting layer 3: close the periphery of the prefabricated I-beam reinforced concrete heightening module 2, and pour micro-expansion concrete in sections to form the bottom grouting layer 3; S5, installation of prefabricated cover plate 1: hoist the adjacent cover plate unit 4 and the middle cover plate unit 5 of the prefabricated reinforced concrete cover plate 1 to the top of the heightening module 2 in sequence, so that the shear key 21 is accurately embedded in the shear groove 41, 51, fill the joints of the cover plate units with high-strength micro-expansion concrete, and pressure-inject cement-based grouting material into the gap between the cover plate 1 and the heightening module 2; Special node processing (such as the crossing of station canopy columns): cut the prefabricated cover plate 1 and heightening module 2 as needed, perform anti-rust treatment on the exposed steel bars after cutting, and embed them around the canopy columns; pour a leveling layer on the surface of the cover plate (1) and lay floor tiles.

[0028] It should be noted that the shape of the prefabricated I-beam reinforced concrete heightening module 2 of the present invention can be appropriately adjusted according to different platform widths and load conditions. For example, for areas with larger loads, the web thickness or reinforcement ratio can be increased; for platforms with larger widths, the flange width can be increased; for areas with special requirements, such as elevator shafts, canopy columns, etc., special-shaped modules can be made to improve adaptability.

[0029] In addition, the thickness of the bottom grouting layer 3 can be adjusted according to the existing platform foundation conditions and height increase requirements, and is generally controlled between 100-250 mm.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An existing railway platform heightening beam and slab assembly structure, characterized by: It comprises a prefabricated reinforced concrete cover plate (1), a prefabricated I-beam reinforced concrete heightening module (2), and a bottom grouting layer (3); the prefabricated reinforced concrete cover plate (1) is formed by sequentially splicing a plurality of adjacent cover plate units (4) at both sides and an intermediate cover plate unit (5) at the middle; three shear grooves (41) are provided on the lower side of the adjacent cover plate unit (4), two shear grooves (51) are provided on the lower side of the intermediate cover plate unit, two shear keys (21) are provided on the upper end of the prefabricated I-beam reinforced concrete heightening module (2), and at least two height-adjustable supports (22) are provided on both sides of the bottom; The prefabricated I-beam reinforced concrete heightening module (2) is arranged below the adjacent line cover plate unit (4) and the intermediate cover plate unit (5); the shear key (21) at the upper end of the prefabricated I-beam reinforced concrete heightening module is inserted into the lower shear groove (41) of the line cover plate unit (4) and the lower shear groove (51) of the intermediate cover plate unit (5) to form a connection; and the bottom is connected to the grouting layer (3) via a height-adjustable support (22).

2. The existing railway platform heightening beam and slab assembly structure as claimed in claim 1, characterized in that: The prefabricated I-beam reinforced concrete heightening module (2) has a longitudinal length of 3000 mm, and the adjacent line cover plate unit (4) extends outwards by 250 mm on one side adjacent to the line.

3. The existing railway platform heightening beam and slab assembly structure as claimed in claim 1, characterized in that: There are gaps between the longitudinally arranged prefabricated I-beam reinforced concrete heightening modules (2), and longitudinally adjacent webs are connected by filling micro-expansion concrete or elastic material.

4. The existing railway platform heightening beam and slab assembly structure according to claim 1 is characterized in that: The height-adjustable support (22) is composed of a bottom gasket (221) and an adjusting bolt (222), and the adjusting bolt (222) can be adjusted up and down, with an adjustment range of 50 mm.

5. The existing railway platform heightening beam and slab assembly structure according to claim 4 is characterized in that: The adjusting bolt (222) is provided with a locking nut (223), and after adjustment is completed, the bottom gasket (221) is locked on the adjusting bolt (222) by the locking nut (223) to fix the height.

6. The existing railway platform heightening beam and slab assembly structure according to claim 1 is characterized in that: A retaining edge (42) is provided along the longitudinal direction on one edge of the top of the adjacent line cover plate unit (4) adjacent to the line.

7. The existing railway platform heightening beam and slab assembly structure according to claim 1 is characterized in that: The end joints of the adjacent line cover plate units (4) and the intermediate cover plate units (5) are filled with elastic sealant or cement-based grouting material, and expansion joints are provided every 4-6 m along the longitudinal direction of the platform.

8. The existing railway platform heightening beam and slab assembly structure according to claim 1 is characterized in that: The bottom grouting layer (3) is cast in sections using micro-expansion concrete.

9. A construction method for an existing railway platform heightening beam and slab assembly structure as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: S1, prefabricated concrete cover plate (1) and prefabricated I-beam reinforced concrete heightening module (2); S2, roughening the original platform surface, locating the installation position of the prefabricated I-beam reinforced concrete heightening module (2) on the existing platform foundation according to the design elevation, and marking the axis and the support point of the height-adjustable support (22); S3, hoisting the prefabricated I-beam reinforced concrete heightening module (2) to the marked position, rotating the bottom gasket (221) to adjust the module height, and checking the elevation of the top surface of each module, and connecting adjacent heightening modules (2) by filling micro-expansion concrete or elastic material with the reserved gap between the webs; S4, enclosing the bottom of the prefabricated I-beam reinforced concrete heightening module (2) and pouring micro-expansion concrete in sections to form a bottom grouting layer (3); The adjacent cover plate unit (4) and the middle cover plate unit (5) of the prefabricated reinforced concrete cover plate (1) are sequentially hoisted to the top of the prefabricated I-beam reinforced concrete heightening module (2), so that the shear key (21) is embedded in the shear groove (41, 51), elastic sealant or cement-based grouting material is filled in the longitudinal joints of the cover plate units, and cement-based grouting material is pressure-injected into the gap between the prefabricated reinforced concrete cover plate (1) and the prefabricated I-beam reinforced concrete heightening module (2); a leveling layer is poured on the surface of the cover plate (1), and floor tiles are laid.

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