A bidirectional stress laminated slab and a construction method thereof

Abstract

The application relates to a bidirectional stress laminated slab and a construction method thereof, and relates to the technical field of the assembled laminated floor slab structure. The bidirectional stress laminated slab comprises a base plate, metal connecting pieces are arranged on each side of the base plate, the cross sections of the metal connecting pieces are all arranged in the shape of an L, the horizontally arranged parts of the metal connecting pieces are embedded in the base plate, and the upper ends of the vertically arranged parts of the metal connecting pieces all extend out of the upper surface of the base plate. When two bidirectional stress laminated slabs arranged adjacently are connected, the vertically arranged parts of the two metal connecting pieces arranged on the opposite sides of the two base plates are attached to each other, and the parts of the two metal connecting pieces extending out of the upper surface of the base plate are fixedly connected to each other. The application has the effect of effectively reducing the construction requirement on the premise of ensuring the stress capacity of the splicing joint between the two bidirectional stress laminated slabs arranged adjacently.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of assembled composite floor slab structures, in particular to a bidirectional stress composite slab and a construction method thereof. BACKGROUND

[0002] The composite floor slab technology refers to dividing a floor slab into two parts along the thickness direction, the bottom part being a prefabricated bottom plate and the upper part being a post-cast concrete composite layer. The prefabricated bottom plate with configured bottom steel bars serves as a part of the floor slab and bears the load as a formwork of the post-cast concrete composite layer during the construction stage, and the post-cast concrete forms an integral composite concrete component. Among them, the composite slab can be designed as a unidirectional stress composite slab or a bidirectional stress composite slab according to the prefabricated plate joint structure, support structure and length-width ratio. When a separate joint is used between the prefabricated plates, the unidirectional stress composite slab is designed. For the four-edge supported composite slab with a length-width ratio not greater than 3, when an integral joint or no joint is used between the prefabricated plates, the bidirectional stress composite slab is designed.

[0003] Compared with the unidirectional stress composite slab, the bidirectional stress composite slab has reduced long-directional rigidity, reduced long-directional bending resistance, increased short-directional bending resistance and increased short-directional bending moment, so that the stress capacity at the splicing joint between two adjacent bidirectional stress composite slabs is poor in actual use, and cracks are prone to occur in the transition layer between the adjacent base plates, affecting the overall service life of the composite slab.

[0004] The related technology disclosed in a bidirectional stress composite slab and a construction method thereof with the publication number CN112144723B includes a base plate formed by pouring reinforced concrete; the base plate is integrally poured by a bottom layer, an intermediate layer and a top layer; connecting steel bars are exposed between the bottom layer and the intermediate layer; an arc-shaped insertion slot for inserting the connecting steel bars is arranged at one end of the intermediate layer away from the connecting steel bars; an arc-shaped groove for supporting the connecting steel bars is arranged on the upper surface of the bottom layer and the extension part of the bottom layer; notches are arranged on both sides of the top layer along the length direction of the base plate; the connecting piece is integrally fixed by a connecting sleeve and a connecting column; a plug hole for inserting the connecting column is arranged in the connecting sleeve; and the connecting columns of the left and right adjacent base plates are inserted into the plug holes of the connecting sleeves.

[0005] In the above related technology, the connecting steel bars can be inserted into the arc-shaped insertion slot and the arc-shaped groove, and the connecting column is inserted into the plug hole to fixedly connect the two base plates. However, when connecting any two adjacent base plates, the horizontal moving mode is needed to connect the two base plates, so that a certain horizontal moving space is needed for the installation of the base plate. When four base plates are arranged in a rectangular shape, the fourth base plate needs to be connected with two base plates along the length direction and the width direction at the same time. At this time, the fourth base plate needs to be connected along the length direction and the width direction at the same time, and the construction difficulty is large, so it needs to be improved. SUMMARY

[0006] The purpose of the present application is to provide a bidirectional stress laminated slab and its construction method, which effectively reduces the construction requirements under the premise of ensuring the stress capacity at the splicing joint between any two adjacent bidirectional stress laminated slabs.

[0007] In the first aspect, the present application provides a bidirectional stress laminated slab, which adopts the following technical scheme:

[0008] A bidirectional stress laminated slab comprises a base plate, and a metal connecting piece is arranged on each side of the base plate. The cross section of each metal connecting piece is in the shape of "L". The horizontally arranged part of each metal connecting piece is embedded in the base plate, and the upper end of the vertically arranged part of each metal connecting piece extends out of the upper surface of the base plate.

[0009] When any two adjacent bidirectional stress laminated slabs are connected, the vertically arranged parts of the two metal connecting pieces on the side facing each other of the two base plates are in close contact with each other, and the parts of the two metal connecting pieces extending out of the upper surface of the base plate are fixedly connected with each other.

[0010] Specifically, when the bidirectional stress laminated slabs are spliced, it is only necessary to hoist and splice the bidirectional stress laminated slabs in the vertical direction, and the metal connecting pieces are used to connect any two adjacent bidirectional stress laminated slabs. The upper part of the metal connecting piece extends out of the upper surface of the bidirectional stress laminated slab, so the space requirement is low, and there is no connection interference point, so the construction requirements can be effectively reduced.

[0011] Further, the upper end of the metal connecting piece is provided with a plurality of connecting holes, and each connecting hole is arranged along the length direction of the metal connecting piece.

[0012] Each connecting steel bar has a fastening nut threadedly connected at both ends thereof, which can be in close contact with the side surface of the metal connecting piece.

[0013] Specifically, the connecting holes arranged on the metal connecting piece can be used to pass the connecting steel bars through the two metal connecting pieces, so as to fixedly connect any two adjacent bidirectional stress laminated slabs. In addition, the connecting steel bars can also be used as steel members in the cast-in-place concrete, which can effectively ensure the overall strength of the laminated slab poured in the direction.

[0014] Further, a connecting frame is arranged above the base plate, and the part of each connecting steel bar close to the connecting frame is fixedly connected with the connecting frame.

[0015] The bottom surface of the connecting frame is provided with several support rods, and the lower end of each support rod is embedded in the substrate.

[0016] Specifically, the connecting frame can be used to connect the connecting steel bars located above the base plate into a whole, further ensuring the connection stability between the individual connecting steel bars.

[0017] Furthermore, the connecting frame is formed by welding four metal strips with an "L" shaped cross section in sequence. Several fixing holes are provided on the side of the connecting frame for the connecting steel bars to pass through. Each part of the connecting steel bar that passes through the connecting frame is also threaded with a fixing nut that abuts against the inner side of the connecting frame.

[0018] Specifically, by utilizing the fit between the fixing nut and the connecting steel bar, a fixed connection between the connecting steel bar and the connecting frame can be achieved.

[0019] Furthermore, a number of steel wire ropes are arranged along the length of the side of the substrate. One end of each steel wire rope is embedded in the substrate, and the other end of each steel wire rope is led out from the bottom surface of the substrate. A number of through holes are also provided on the side of the substrate, and each through hole is staggered with each steel wire rope at intervals.

[0020] When any two adjacent bidirectional force-bearing composite plates are connected, each steel wire rope of one base plate near the other base plate passes through the adjacent base plate, and the portion of each steel wire rope extending out of the upper surface of the base plate is fixed by a rope clamp.

[0021] Specifically, by utilizing the cooperation between the wire rope and the rope clamp, when any two adjacent bidirectional load-bearing composite plates are connected, the lower side of any one bidirectional load-bearing composite plate can be connected to the upper side of the other bidirectional load-bearing composite plate, further ensuring the connection strength between any two adjacent bidirectional load-bearing composite plates.

[0022] Furthermore, the substrate includes an upper plate and a lower plate that are positioned vertically. The top view area of ​​the upper plate is larger than that of the lower plate. Each side of the upper plate extends out of the lower plate. The horizontally arranged portions of each metal connector are in contact with the bottom surface of the upper plate. One end of each steel wire rope embedded in the substrate is located within the portion of the upper plate that extends out of the lower plate. The end of each steel wire rope leading out of the substrate passes through the horizontally arranged portion of the metal connector.

[0023] When any two adjacent bidirectional load-bearing composite plates are connected, the portion of the steel wire rope below the upper plate is located between the two lower plates, and structural adhesive is filled between the two lower plates.

[0024] Specifically, the use of structural adhesive in conjunction with the lower slab can effectively conceal the steel wire rope, ensuring the flatness of the bottom surface of the completed composite floor slab.

[0025] Furthermore, each of the metal connectors has two isolation protrusions on the side facing away from the center of the substrate, and the two isolation protrusions are respectively disposed on both ends of the metal connector.

[0026] When any two adjacent bidirectional load-bearing composite plates are connected, the two metal connectors that are in contact with each other form a glue-filling channel, through which the structural adhesive enters between the two lower plates.

[0027] Specifically, the isolation protrusions are used to enclose the two metal connectors that are in contact with each other to form a channel for injecting adhesive, which facilitates the injection and molding of structural adhesive.

[0028] Secondly, this application provides a construction method for the biaxially stressed composite slab described above, employing the following technical solution:

[0029] A construction method for a two-way stressed composite slab, characterized by comprising the following steps:

[0030] S1. Construct the floor slab formwork and place each bi-directional load-bearing composite slab on the floor slab formwork;

[0031] S2. Pass each wire rope through the adjacent substrate, and use the pipe clamp to fix the part of the wire rope that is passed through the upper surface of the substrate to the column using the rope clamp.

[0032] S3. Install a sealing plate between the bottom surfaces of any two adjacent substrates, and then fill the space between the two lower plates with structural adhesive.

[0033] S4. Install connecting steel bars between any two adjacent base plates, and fix each connecting steel bar to any two adjacent connecting frames.

[0034] S5. Pour concrete onto the top surface of the assembled two-way load-bearing composite slab. After the concrete solidifies, the composite floor slab will be formed.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] 1. It can effectively reduce the construction requirements of composite floor slabs while ensuring the load-bearing capacity of the joints connecting any two adjacent two-way load-bearing composite slabs;

[0037] 2. The production of bidirectional load-bearing composite slabs is relatively convenient, and no steel bars will protrude after the bidirectional load-bearing composite slabs are produced, which makes them easy to handle and transport. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the composite floor slab according to an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the structure of the bidirectional stress-bearing composite plate according to an embodiment of this application;

[0040] Figure 3 This is a schematic diagram of the substrate structure according to an embodiment of this application;

[0041] Figure 4 This is a top view schematic diagram of the connection between two metal connectors according to an embodiment of this application;

[0042] Figure 5 yes Figure 2 A magnified view of part A;

[0043] Figure 6 This is a schematic diagram of the connection between two bidirectional load-bearing composite plates according to an embodiment of this application.

[0044] Reference numerals: 1. Substrate; 2. Metal connector; 21. Isolation protrusion; 22. Glue channel; 3. Connecting steel bar; 31. Fastening nut; 32. Fixing nut; 4. Connecting frame; 41. Metal strip; 42. Support rod; 5. Steel wire rope; 51. Rope clamp; 6. Structural adhesive. Implementation

[0045] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail below.

[0046] A bidirectional load-bearing composite plate, as shown in the figure Figure 1 and Figure 2 The system includes a base plate 1, metal connectors 2, connecting steel bars 3, connecting frames 4, and steel wire ropes 5. Four metal connectors 2 are provided, each located on one of the four sides of the base plate 1. Several connecting steel bars 3 are provided on each metal connector 2. The connecting frame 4 is located above the base plate 1, with one end of each connecting steel bar 3 near the center of the base plate 1 fixed to the connecting frame 4. Several steel wire ropes 5 are provided on each side of the base plate 1, with one end of each steel wire rope 5 extending from the bottom of the base plate 1.

[0047] Reference Figure 3 The substrate 1 includes an upper plate and a lower plate that are positioned vertically. The top view area of ​​the upper plate is larger than that of the lower plate, and each side of the upper plate extends out of the lower plate. The metal connector 2 has an "L" shaped cross-section. The horizontal part of the metal connector 2 is embedded in the junction of the upper plate and the lower plate, and the vertical part of the metal connector 2 is embedded in the edge of the upper plate. The upper end of the vertical part of the metal connector 2 extends out of the upper surface of the substrate 1.

[0048] Among them, reference Figure 4 and Figure 5 Each metal connector 2 has two isolation protrusions 21 on the side away from the center of the substrate 1. The length of the isolation protrusions 21 extends in the vertical direction, and the two isolation protrusions 21 are respectively located on both ends of the metal connector 2. When any two adjacent bidirectional force-bearing laminates are in contact, the two metal connectors 2 that are in contact with each other form a potting channel 22.

[0049] Reference Figure 3 and Figure 5 The connecting frame 4 is formed by welding four metal strips 41 with an "L" shaped cross section in sequence. Several support rods 42 are provided on the bottom surface of each metal strip 41. Each support rod 42 is arranged along the length of the metal strip 41, and the lower end of each support rod 42 is embedded in the base plate 1. Several connecting holes are provided at the upper end of the metal connector 2. Several fixing holes are provided on the vertical part of each metal strip 41. Each fixing hole is arranged along the length of the metal strip 41. Fastening nuts 31 and fixing nuts 32 are threaded to both ends of each connecting steel bar 3. The fastening nuts 31 are pressed against the side of the metal connector 2 near the base plate 1, and the fixing nuts 32 are pressed against the inner side of the connecting frame 4.

[0050] Among them, combined Figure 1 Each connecting steel bar 3 located between any two adjacent bidirectional load-bearing composite slabs is shared by the two bidirectional load-bearing composite slabs.

[0051] Reference Figure 5 and Figure 6 One end of each steel wire rope 5 is embedded in the edge of the upper plate, and the other end of each steel wire rope 5 extends from the bottom surface of the upper plate. The portion of each steel wire rope 5 extending from the bottom surface of the upper plate also passes through the horizontally arranged portion of the metal connector 2. Several through holes are also provided on the side of the base plate 1, each through hole being located at the edge of the upper plate and passing through the horizontally arranged portion of the metal connector 2. When any two adjacent bidirectional load-bearing composite plates are connected, the steel wire ropes 5 of one base plate 1 closest to the other base plate 1 pass through the adjacent base plate 1, and the portions of each steel wire rope 5 extending beyond the upper surface of the base plate 1 are fixed using rope clamps 51.

[0052] When any two adjacent bidirectional load-bearing composite plates are connected, the portion of the steel wire rope 5 below the upper plate is located between the two lower plates, and structural adhesive 6 is filled between the two adjacent lower plates.

[0053] The working principle of this application embodiment:

[0054] When splicing the bidirectional load-bearing composite slabs, it is only necessary to hoist and splice the bidirectional load-bearing composite slabs in the vertical direction. Any two adjacent bidirectional load-bearing composite slabs are connected by metal connectors 2. The upper part of the metal connectors 2 extends beyond the upper surface of the bidirectional load-bearing composite slabs, so the space requirements are low and there are no connection interference points. By utilizing the cooperation between the wire rope 5 and the rope clamp 51, when any two adjacent bidirectional load-bearing composite slabs are connected, the lower side of any one bidirectional load-bearing composite slab can be connected to the upper side of the other bidirectional load-bearing composite slab, further ensuring the connection strength between any two adjacent bidirectional load-bearing composite slabs.

[0055] This application also provides a construction method for the biaxially stressed composite slab described above, employing the following technical solution:

[0056] A construction method for a two-way stressed composite slab includes the following steps:

[0057] S1. Construct the floor slab formwork and place each bi-directional load-bearing composite slab on the floor slab formwork;

[0058] S2. Pass each wire rope 5 through the adjacent base plate 1, and use the pipe clamp to fix the part of the wire rope 5 that is passed through the upper surface of the base plate 1 to the post using the rope clamp 51.

[0059] S3. Install a sealing plate between the bottom surfaces of any two adjacent substrates 1, and then fill the space between the two lower plates with structural adhesive 6.

[0060] S4. Install connecting steel bars 3 between any two adjacent base plates 1, and fix each connecting steel bar 3 to any two adjacent connecting frames 4.

[0061] S5. Pour concrete on the upper surface of the spliced ​​two-way load-bearing composite slab. After the concrete solidifies, the composite floor slab will be formed.

[0062] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bidirectional load-bearing composite plate, characterized in that, Includes a substrate (1), and each side of the substrate (1) is provided with a metal connector (2). The cross-section of each metal connector (2) is arranged in an "L" shape. The horizontal part of each metal connector (2) is embedded in the substrate (1), and the upper end of the vertical part of each metal connector (2) extends out of the upper surface of the substrate (1). When any two adjacent bidirectional force-bearing composite plates are connected, the vertically arranged portions of the two metal connectors (2) located on opposite sides of the two substrates (1) are attached to each other, and the portions of the two metal connectors (2) extending out of the upper surface of the substrate (1) are fixedly connected to each other. The upper end of the metal connector (2) is provided with several connecting holes, each of which is arranged along the length of the metal connector (2). Several connecting steel bars (3) are provided between any two adjacent bidirectional load-bearing composite plates. The middle part of each connecting steel bar (3) passes through the connecting holes on the metal connector (2). Both ends of each connecting steel bar (3) are threaded with fastening nuts (31) that can fit against the side of the metal connector (2). The connector also includes a connecting frame (4), which is located directly above the base plate (1). Each connecting steel bar (3) is close to the connecting frame (4). The part near the connecting frame (4) is fixedly connected to the connecting frame (4); wherein, a number of support rods (42) are provided on the bottom surface of the connecting frame (4), and the lower end of each support rod (42) is embedded in the base plate (1). The connecting frame (4) is formed by welding four metal strips (41) with an "L" shaped cross section in sequence. A number of fixing holes for the connecting steel bars (3) to pass through are provided on the side of the connecting frame (4). Each part of the connecting steel bar (3) that passes through the connecting frame (4) is also threadedly connected with a fixing nut (32) that abuts against the inner side of the connecting frame (4).

2. The bidirectional stress-bearing composite plate according to claim 1, characterized in that, The substrate (1) has several steel wire ropes (5) arranged along the length of the side. One end of each steel wire rope (5) is embedded in the substrate (1), and the other end of each steel wire rope (5) is led out from the bottom surface of the substrate (1). The substrate (1) also has several through holes, and each through hole is staggered with each steel wire rope (5). When any two adjacent bidirectional force-bearing composite plates are connected, each of the steel wire ropes (5) of one base plate (1) near the other base plate (1) passes through the adjacent base plate (1), and the part of each steel wire rope (5) extending out of the upper surface of the base plate (1) is fixed by rope clamps (51).

3. The bidirectional stress-bearing composite plate according to claim 2, characterized in that, The substrate (1) includes an upper plate and a lower plate in a vertical position. The top view area of ​​the upper plate is larger than that of the lower plate. Each side of the upper plate extends out of the lower plate. The horizontally arranged part of each metal connector (2) is in contact with the bottom surface of the upper plate. One end of each wire rope (5) embedded in the substrate (1) is located in the part of the upper plate extending out of the lower plate. The end of each wire rope (5) leading out of the substrate (1) passes through the horizontally arranged part of the metal connector (2). When any two adjacent bidirectional force-bearing composite plates are connected, the part of the wire rope (5) below the upper plate is located between the two lower plates. The space between the two lower plates is filled with structural adhesive (6).

4. A bidirectional load-bearing composite plate according to claim 3, characterized in that, Each of the metal connectors (2) has two isolation protrusions (21) on the side facing away from the center of the substrate (1), and the two isolation protrusions (21) are respectively disposed on both ends of the metal connector (2); When any two adjacent bidirectional stress-bearing composite plates are connected, the two metal connectors (2) that are in contact with each other form a glue-filling channel (22), and the structural adhesive (6) enters between the two lower plates through the glue-filling channel (22).

5. A construction method for a bidirectional load-bearing composite slab as described in any one of claims 1-4, characterized in that, Includes the following steps: S1. Construct the floor slab formwork and place each bi-directional load-bearing composite slab on the floor slab formwork; S2. Pass each wire rope through the adjacent substrate, and use the pipe clamp to fix the part of the wire rope that is passed through the upper surface of the substrate to the column using the rope clamp. S3. Install a sealing plate between the bottom surfaces of any two adjacent substrates, and then fill the space between the two lower plates with structural adhesive. S4. Install connecting steel bars between any two adjacent base plates, and fix each connecting steel bar to any two adjacent connecting frames. S5. Pour concrete on the upper surface of the spliced ​​two-way load-bearing composite slab. After the concrete solidifies, the composite floor slab will be formed.

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