Prefabricated platform plate construction method and prefabricated platform plate cup opening thereof

Abstract

The invention discloses a prefabricated platform plate construction method and a prefabricated platform plate cup rabbet thereof, and belongs to the technical field of engineering construction.The construction method comprises the steps that S1, a station structure bottom plate is constructed, and a platform plate placing area with reserved cup rabbet vertical ribs is divided during construction; s2, a supporting component capable of reaching the preset elevation is placed at the position, corresponding to the cup opening web plate, in the cup opening vertical rib, and a prefabricated platform plate is placed; and S3, cup opening transverse bars are bound, and a formwork is erected to pour a cup opening. The prefabricated platform plate cup rabbet comprises a cup rabbet with a U-shaped section, the cup rabbet comprises a cup rabbet flange and a cup rabbet web, cup rabbet vertical ribs are arranged in the cup rabbet flange, and cup rabbet transverse ribs and supporting components are arranged in the cup rabbet web. The preset elevation is adjusted firstly through the supporting component, pouring of the cup rabbet can be conducted after the prefabricated platform plate is placed, the cup rabbet strength waiting time does not exist before the prefabricated platform plate is placed, the problems that the cup rabbet cannot meet the preset elevation and needs follow-up treatment and the cup rabbet is cracked up in the placing process do not exist, and therefore the installation efficiency and the installation precision are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engineering construction, in particular to a construction method of a prefabricated platform slab and a prefabricated platform slab cup. Background Art

[0002] Platform slabs are crucial internal structures within subway stations, serving as the primary platform for passengers to board and exit trains when they stop. Currently, platform slab construction primarily relies on cast-in-place structures. However, with the advancement of prefabricated construction technology, prefabricated structures are increasingly being adopted for internal platform slabs. These structures are prefabricated in factories and assembled on-site in standardized procedures, offering controlled quality and environmentally friendly features.

[0003] Generally, before installing the prefabricated platform slab, it is necessary to cast a prefabricated platform slab cup on the station floor to support the prefabricated platform slab. The purpose of doing this is to use the cup for leveling. At the same time, backfilling the gap between the cup and the platform slab supporting wall can also improve the overall stability of the prefabricated platform slab. However, during the specific implementation of prefabricated platform slabs, the following problems exist: 1. Long construction period: ① It is necessary to wait until the concrete strength of the cup mouth meets the requirements before the prefabricated platform slabs can be installed, and the waiting time is long; ② The surface elevation of the web of the cup mouth directly affects the accuracy of the installation elevation of the prefabricated platform slab. If the elevation of the web of the cup mouth does not meet the requirements, such as exceeding the elevation, the cup mouth needs to be reduced. If it is lower than the elevation, the cup mouth needs to be repaired and leveled with local cement slurry again. In addition to the difficulty in ensuring the quality of the repair, the repair material also needs to wait until it is strong before the prefabricated platform slab can be installed, which further extends the waiting time, resulting in a long construction period and low installation efficiency; 2. Low installation accuracy: The space in the station is small, and the cast cup mouth is easily damaged by the transportation and lifting machinery used to install the prefabricated platform slab during the placement of the prefabricated platform slab, resulting in low installation accuracy of the prefabricated platform slab in the later stage. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems and provide a prefabricated platform slab construction method and a prefabricated platform slab cup mouth. The preset elevation is first adjusted using a supporting component, and the cup mouth can be cast after the prefabricated platform slab is placed. There is no waiting time for the cup mouth strength before placing the prefabricated platform slab, thereby reducing the construction period and avoiding the problem of the cup mouth failing to meet the preset elevation. No subsequent processing is required, further reducing the construction period and improving the installation efficiency. Moreover, the cup mouth is cast together with the supporting wall of the prefabricated platform slab, which has stronger integrity and improves the structural strength. The problem of the cup mouth being damaged during the installation of the prefabricated platform slab will not occur, thereby improving the accuracy of the installation of the prefabricated platform slab.

[0005] To achieve the above-mentioned object, the present invention provides the following solution: The present invention discloses a method for constructing a prefabricated platform slab, comprising the following steps:

[0006] S1. Construct the station structure base plate. During construction, a platform plate placement area is divided. Vertical reinforcement for forming the cup flange is reserved in the platform plate placement area.

[0007] S2. Place a support member in the cup opening vertical rib at a position corresponding to the cup opening web, wherein the support surface of the support member can reach a preset elevation, and place a prefabricated platform plate on the support surface of the support member;

[0008] S3. Tie the cup mouth horizontal reinforcement to the cup mouth vertical reinforcement, and then set up the formwork to cast the cup mouth.

[0009] Preferably, in step S2, when placing the supporting members, the supporting members corresponding to the first prefabricated platform panel are placed first, then the first prefabricated platform panel is placed, and then the supporting members and the prefabricated platform panel of the next prefabricated platform panel are placed, until all the prefabricated platform panels in the platform panel placement area are placed.

[0010] Preferably, in step S2, two groups of cup-rim vertical ribs corresponding to the two supporting walls of the prefabricated platform slab are provided in the platform slab placement area, each group includes two rows of the cup-rim vertical ribs, and the supporting member is located between the two rows of the cup-rim vertical ribs in each group.

[0011] Preferably, the supporting member comprises a channel steel, and when placed, the web of the channel steel is arranged upward, and the supporting wall of the prefabricated platform slab is placed on the web of the channel steel.

[0012] Preferably, in step S2, the length of the channel steel is smaller than the length of the prefabricated platform plate, and the channel steel is arranged between two rows of cup-shaped vertical bars along the length direction of the platform plate placement area, and a spacing for tying the cup-shaped horizontal bars is reserved between two adjacent channel steels.

[0013] Preferably, the supporting member further comprises a compensating member, which is placed on the web of the channel steel, and the supporting surface of the compensating member has the preset elevation.

[0014] Preferably, the compensating member is a steel block or a steel bar.

[0015] Preferably, in step S2, a lifting and transportation device is used to place the supporting wall of the prefabricated platform slab on the supporting member.

[0016] Preferably, in step S3, high-strength non-shrinkage grouting material or self-compacting concrete is used to cast the cup mouth.

[0017] Also disclosed is a prefabricated platform slab cup mouth, comprising a cup mouth with a U-shaped cross-section, the cup mouth comprising a cup mouth flange and a cup mouth web both of which are cast from concrete, the cup mouth flange being provided with cup mouth vertical reinforcements embedded in the station structure base plate, the cup mouth web being provided with cup mouth transverse reinforcements and a supporting member, the supporting member being used for placing the prefabricated platform slab before casting the cup mouth web, the supporting members being arranged at intervals along the length direction of the cup mouth, the supporting surface of the supporting member being flush with the supporting surface of the cup mouth web, and the cup mouth transverse reinforcements being tied and connected to the cup mouth vertical reinforcements.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] In the present invention, the preset elevation is adjusted first by using the supporting components, and the cup mouth can be cast after the prefabricated platform slab is placed. This eliminates the correlation between the cup mouth strength waiting process and the prefabricated platform slab placement process. The prefabricated platform slab can be installed without waiting for the cup mouth strength to meet the time limit, thereby reducing the construction period. Moreover, the cast cup mouth will not fail to meet the preset elevation, and no adjustment is required later, which can further reduce the construction period and improve the efficiency of installing the prefabricated platform slab. Moreover, the supporting wall connected to the prefabricated platform slab is used to cast the cup mouth together, which has stronger casting integrity and improves the structural strength. In addition, because the prefabricated platform slab is placed first and the cup mouth is cast later, the problem of damaging the cup mouth during installation of the prefabricated platform slab will not occur, thereby improving the accuracy of installing the prefabricated platform slab. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 Schematic diagram of the three-dimensional structure of a portion of the prefabricated platform slab after placement in the prefabricated platform slab construction method in the embodiment;

[0022] Figure 2 for Figure 1 A partial enlarged view of

[0023] Figure 3 for Figure 2 A partial enlarged view of

[0024] Figure 4 Schematic diagram of the front view of a portion of the prefabricated platform slab after placement in the prefabricated platform slab construction method in the embodiment;

[0025] Figure 5 for Figure 4 A partial enlarged view of

[0026] Figure 6 Schematic diagram of the three-dimensional structure of a prefabricated platform slab during placement in the prefabricated platform slab construction method in the embodiment;

[0027] Figure 7 for Figure 6 A partial enlarged view of

[0028] Figure 8 Schematic diagram of the three-dimensional structure after pouring the cup mouth in the construction method of the prefabricated platform slab in the embodiment;

[0029] Figure 9 for Figure 8 A partial enlarged view of

[0030] Figure 10 for Figure 9 A partial enlarged view of

[0031] Figure 11 This is a construction flow chart for the prefabricated platform slab construction method.

[0032] Explanation of the accompanying symbols: 1. Station structure base plate; 2. Prefabricated platform plate; 3. Cup-mouth vertical reinforcement; 4. Supporting member; 5. Cup-mouth; 6. Channel steel; 7. Steel block; 8. Cup-mouth flange; 9. Cup-mouth web. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1

[0035] This embodiment provides a method for constructing a prefabricated platform slab. Figures 1 to 11 As shown, the following steps are included:

[0036] S1. Construct the station structure base plate 1. During construction, divide the platform plate placement area, and reserve the cup-shaped vertical reinforcement 3 in the platform plate placement area for forming the cup-shaped flange 8;

[0037] S2. Place a support member 4 at a position corresponding to the cup mouth web 9 within the cup mouth vertical rib 3, and place the prefabricated platform plate 2 on the supporting surface of the support member 4. The supporting surface of the support member 4 can reach a preset elevation to meet the installation elevation requirement of the prefabricated platform plate 2.

[0038] S3. Tie the cup mouth horizontal reinforcement on the cup mouth vertical reinforcement 3, and then support the formwork to cast the cup mouth 5.

[0039] This method uses the supporting member 4 to first adjust the preset elevation, and then casts the cup mouth 5 after the precast platform slab 2 is placed, which can effectively meet the installation elevation of the precast platform slab 2. There is no problem of the cast cup mouth 5 not meeting the preset elevation, and no adjustment is required later. Moreover, there is no correlation between the process of waiting for the cup mouth strength and the process of placing the precast platform slab. The process of waiting for the cup mouth strength is postponed, and there is no need to wait for the cup mouth strength to meet the requirements. The precast platform slab 2 can be placed directly on the support, thereby reducing the construction period and improving the efficiency of installing the precast platform slab 2. The supporting wall of the precast platform slab 2 is connected to the cup mouth 5 for casting together. Compared with post-casting the gap between the cup mouth 5 and the supporting wall, this method has stronger casting integrity and improves the structural strength. In addition, because the precast platform slab 2 is placed first and the cup mouth 5 is cast later, there will be no problem of damaging the cup mouth 5, thereby improving the accuracy of installing the precast platform slab 2.

[0040] In one embodiment, if Figures 1 to 11 As shown, in step S2, when placing the support members 4, first place the support members 4 corresponding to the first prefabricated platform board 2, then place the first prefabricated platform board 2, and then place the support members 4 and prefabricated platform board 2 of the next prefabricated platform board 2, until all the prefabricated platform boards 2 in the platform board placement area are placed. When placing, pay attention to adjusting the position of each prefabricated platform board 2 so that they fit together. Of course, you can also place all the support members 4 first, and then place the prefabricated platform boards 2 in sequence, but because the support members 4 and prefabricated platform boards 2 need to be adjusted at any time, this method is not as good as placing the support members 4 and the corresponding prefabricated platform boards 2 first, and then placing the support members 4 and the corresponding prefabricated platform boards 2.

[0041] In one embodiment, if Figures 1 to 11 As shown, two sets of rim reinforcements 3 are provided in the platform slab placement area. These two sets of rim reinforcements 3 correspond to the two supporting walls of the precast platform slab 2. Each set of rim reinforcements 3 includes two rows of rim reinforcements 3, and support members 4 are located between the two rows of rim reinforcements 3 in each set of rim reinforcements 3. The two supporting walls of the precast platform slab 2 are supported on the support members 4 of the two sets of rim reinforcements 3, respectively.

[0042] In one embodiment, if Figures 1 to 11As shown, the supporting member 4 includes a channel steel 6, which is placed with the web of the channel steel 6 facing upward, and the supporting wall of the prefabricated platform slab 2 is placed on the web of the channel steel 6. The thickness of the channel steel 6 can be preset to a standard thickness (such as finding a factory to prefabricate or directly purchasing a model with a suitable thickness). This standard thickness can enable the web surface of the channel steel 6 placed on the station structure base plate 1 (the platform slab placement area of ​​the station structure base plate 1 is at an ideal elevation) to directly have a preset elevation. However, if the platform slab placement area of ​​the station structure base plate 1 itself is uneven, that is, it is lower than or higher than the ideal elevation, or if the channel steel 6 is inconvenient or impossible to find a factory to prefabricate, and the channel steel 6 of standard thickness is not available on the market, it is necessary to place other objects to adjust the elevation. The specific adjustment method will not be described in detail here, and will be described in detail in other embodiments.

[0043] Further, in one embodiment, if Figures 1 to 11 As shown, in step S2, the length of the channel steel 6 must be less than the length of the prefabricated platform slab 2. The channel steel 6 between the two rows of cup-shaped vertical reinforcement 3 should be arranged along the length of the platform slab placement area, with space reserved between adjacent channels 6 for tying the cup-shaped horizontal reinforcement. In other words, each prefabricated platform slab 2 corresponds to a number of channel steels 6, and the length of the channel steels 6 is set as needed. Preferably, the channel steel 6 is 8 to 12 cm long, with two to three channel steels 6 placed for each prefabricated platform slab 2.

[0044] In one embodiment, if Figures 1 to 11 As shown, the supporting structure 4 also includes a compensating part, which is placed on the web of the channel steel 6. The compensating part is used to increase the overall placement height of the channel steel 6 so that the supporting surface of the compensating part directly reaches the preset elevation, and the supporting wall of the prefabricated platform slab 2 can be placed on the supporting surface of the compensating part. In this way, there is no need to prefabricate or purchase channel steels 6 of appropriate thickness, and the problem of the unevenness of the station structure base plate 1 itself is solved. There is no standard restriction on the thickness of the compensating part. Depending on how much the web of the channel steel 6 is placed on the station structure base plate 1 and how far away it is from the preset elevation, a compensating part of appropriate thickness can be selected. Any specific compensating part can be used, as long as it has sufficient structural strength and rigidity to meet the designed bearing capacity.

[0045] Further, in one embodiment, if Figures 1 to 11 As shown, the compensating member is a steel block 7 or rebar. If a steel block 7 is used, it can be a rectangular or square whole block of appropriate size and thickness. During use, the steel block 7 is placed on the web of the channel steel 6, and the supporting wall of the prefabricated platform slab 2 is then pressed against the steel block 7. If rebar is used, multiple rebars are placed side by side on the web of the channel steel 6. To ensure uniform thickness across the multiple rebars, a single rebar can be cut into several segments.

[0046] In one embodiment, if Figures 1 to 11As shown, in step S2, the prefabricated platform plate 2 is placed on the supporting member 4 by using a lifting and transporting device, and the lifting and transporting device can be a forklift or other equipment.

[0047] In one embodiment, if Figures 1 to 11 As shown, in step S3 , the height of the template is set according to the height of the cup flange 8 , and the cup flange vertical ribs 3 are to be lower than the preset height of the cup flange 8 .

[0048] In one embodiment, if Figures 1 to 11 As shown, in step S3, high-strength non-shrinkage grouting material or self-compacting concrete is used to cast the cup mouth 5.

[0049] Example 2

[0050] This embodiment provides a prefabricated platform plate cup, such as Figures 1 to 11 As shown, the structure comprises a U-shaped rim 5, which includes a rim flange 8 and a rim web 9. Both the rim flange 8 and the rim web 9 are cast from concrete. The rim flange 8 is provided with vertical rim reinforcements 3 embedded in the station structure base 1. The rim web 9 is provided with support members 4 and transverse rim reinforcements. The support members 4 are spaced apart along the length of the rim 5, with their supporting surfaces flush with those of the rim web 9. The support members 4 are used to place the precast platform slab 2 before the rim flange 8 and the rim web 9 are cast. The transverse rim reinforcements are tied to the vertical rim reinforcements 3.

[0051] In one embodiment, if Figures 1 to 11 As shown, the cup mouth 5 can be made by the prefabricated platform plate construction method in Example 1.

[0052] In one embodiment, if Figures 1 to 11 As shown, the supporting member 4 includes a channel steel 6 , which is placed with its web facing upwards, and the supporting wall of the prefabricated platform slab 2 is placed on the web of the channel steel 6 .

[0053] In one embodiment, if Figures 1 to 11 As shown, the length of the channel steel 6 should be shorter than the length of the prefabricated platform slab 2. The channel steel 6 between the two rows of cup-shaped vertical reinforcement 3 is spaced along the length of the cup-shaped slab 5. A space is reserved between adjacent channels 6 for tying the cup-shaped horizontal reinforcement. Preferably, the channel steel 6 is 8 to 12 cm long, with 2 to 3 channel steels 6 placed for each prefabricated platform slab 2.

[0054] In one embodiment, if Figures 1 to 11 As shown, the support structure 4 also includes a compensating member, which is placed on the web of the channel steel 6. The compensating member increases the overall placement height of the channel steel 6 so that the supporting surface of the compensating member directly reaches the preset elevation. The supporting wall of the prefabricated platform slab 2 is placed on the supporting surface of the compensating member. The compensating member is a steel block 7 or a steel bar.

[0055] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A method for constructing a prefabricated platform slab, characterized in that: The following steps are involved: S1. Construct the station structure base plate, divide the platform plate placement area during construction, and reserve cup-mouth vertical reinforcement for forming the cup-mouth flange in the platform plate placement area; S2, placing a support member in the cup mouth vertical rib at a position corresponding to the cup mouth web, the support surface of the support member being able to reach a preset elevation, and placing a prefabricated platform plate on the support surface of the support member; S3, tying the cup mouth transverse reinforcement to the cup mouth vertical reinforcement, and then supporting the formwork to cast the cup mouth.

2. The method for constructing a prefabricated platform slab according to claim 1, characterized in that: In step S2, when placing the supporting components, first place the supporting components corresponding to the first prefabricated platform board, then place the first prefabricated platform board, and then place the supporting components and the prefabricated platform board of the next prefabricated platform board, until all the prefabricated platform boards in the platform board placement area are placed.

3. The method for constructing a prefabricated platform slab according to claim 1, characterized in that: In step S2, two groups of cup-shaped vertical ribs corresponding to two supporting walls of the prefabricated platform slab are provided in the platform slab placement area, each group includes two rows of the cup-shaped vertical ribs, and the supporting member is located between the two rows of the cup-shaped vertical ribs in each group.

4. The method for constructing a prefabricated platform slab according to any one of claims 1 to 3, characterized in that: The supporting member comprises a channel steel, and when placed, the web of the channel steel is arranged upward, and the supporting wall of the prefabricated platform slab is placed on the web of the channel steel.

5. The method for constructing a prefabricated platform slab according to claim 4, characterized in that: In step S2, the length of the channel steel is less than the length of the prefabricated platform slab, and the channel steel is arranged between two rows of cup-mouth vertical bars along the length direction of the platform slab placement area, and a spacing for tying cup-mouth transverse bars is reserved between two adjacent channel steels.

6. The method for constructing a prefabricated platform slab according to claim 5, characterized in that: The supporting member further comprises a compensating member, which is placed on the web of the channel steel, and the supporting surface of the compensating member has the preset elevation.

7. The method for constructing a prefabricated platform slab according to claim 6, characterized in that: The compensating piece is a steel block or a steel bar.

8. The method for constructing a prefabricated platform slab according to claim 1, characterized in that: In step S2, a lifting and transporting device is used to place the supporting wall of the prefabricated platform slab on the supporting member.

9. The method for constructing a prefabricated platform slab according to claim 1, characterized in that: In step S3, high-strength non-shrinkage grouting material or self-compacting concrete is used to cast the cup mouth.

10. A prefabricated platform plate cup mouth, characterized in that: It includes a cup mouth with a U-shaped cross-section, and the cup mouth includes a cup mouth flange and a cup mouth web both of which are cast by concrete. The cup mouth flange is provided with cup mouth vertical reinforcements embedded in the station structure bottom plate, and the cup mouth web is provided with cup mouth transverse reinforcements and supporting members. The supporting member is used for placing prefabricated platform slabs before casting the cup mouth web. The supporting members are arranged at intervals along the length direction of the cup mouth, and the supporting surface of the supporting member is flush with the supporting surface of the cup mouth web. The cup mouth transverse reinforcements are tied and connected to the cup mouth vertical reinforcements.

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