A laminated floor slab and a construction method thereof

Abstract

The application discloses a laminated floor slab and a construction method thereof, and belongs to the technical field of building structures. The laminated floor slab is used to solve the problem that the connection points among SP floor slabs, between the SP floor slab and a laminated layer, and between the SP floor slab and a prefabricated beam are not firm enough and the reliability is not high, which is caused by the construction of the SP floor slab through pouring concrete only. The laminated floor slab comprises a plurality of SP floor slabs arranged side by side. A plurality of hollow holes arranged in a transverse direction are formed in the two end faces of the SP floor slab. The SP floor slab is integrally formed with a laminated layer above the SP floor slab through pouring. The laminated floor slab is characterized in that: the two adjacent SP floor slabs are connected through a side connecting piece. A plurality of vertical holes are formed in the upper surfaces close to the two ends of the SP floor slab. The vertical holes are arranged in an array above the hollow holes and communicate with the corresponding hollow holes. A end connecting piece is further arranged between the hollow hole and the corresponding group of vertical holes. In the laminated floor slab, the connection between the end of the SP floor slab and the prefabricated beam and the connection between the SP floor slab and the laminated layer are more stable and firm, and brittle failure is less likely to occur under an earthquake, so that the reliability of the laminated floor slab is enhanced.

Description

A composite floor slab and its construction method Technical Field

[0001] This invention belongs to the field of building structure technology, and more specifically, relates to a composite floor slab and its construction method. Background Technology

[0002] In the construction of floor slabs, SP slabs are typically used for splicing and pouring concrete. SP slabs are prestressed concrete hollow slabs made of dry-hard concrete and extruded using specialized automated equipment, as shown in Figure 1. SP slabs are characterized by their large applicable span, high load-bearing capacity, and convenient production and construction. When used in frame structures, they can eliminate the need for secondary beams, increase the building's usable height, and reduce the overall project cost.

[0003] SP slabs are typically produced with a width of 1.2m. Factories can cut slabs (without cutting the prestressing tendons) to obtain other slab types with widths less than 1.2m, which are then spliced ​​on-site during floor slab construction. Horizontal seismic forces are generally resisted using the following measures, as shown in Figure 2:

[0004] 1. Pour concrete into the hollow holes at the end of the slab, with a length of about 100mm along the span of the slab, to enhance the connection between the SP slab and the precast beam.

[0005] 2. Grouting (injecting cement mortar or fine aggregate concrete) into the keyway on the side of the plate to enhance the connection between adjacent SP plates;

[0006] 3. A 4mm rough surface is provided on the top of the board to enhance the connection between the SP board and the laminate;

[0007] 4. A composite layer is set on the top of the slab to enhance the overall integrity of the SP floor system.

[0008] All of the above measures enhance the integrity of the floor slab formed by SP slab construction through the strength of the concrete itself or the friction between new and old concrete, thus resisting seismic forces. However, the SP slabs in these measures are only connected by concrete pouring, which makes the connection points between SP slabs, between SP slabs and composite layers, and between SP slabs and precast beams not strong enough and the reliability is not high. When in high seismic intensity zones, they are prone to breakage. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a composite floor slab and its construction method. Through reasonable connectors, connection nodes, and construction methods, it enhances the connections between SP slabs, between SP slabs and composite layers, and between SP slabs and precast beams, thereby improving the overall integrity of the SP slab floor system. This makes the application of SP slabs in high-intensity seismic zones more reliable. Through simple and efficient connections, it enhances the overall integrity of the floor system without significantly increasing production and construction difficulty or affecting construction progress. This solves the problem of insufficient strength and low reliability at connection points between SP slabs, between SP slabs and composite layers, and between SP slabs and precast beams when constructing floor slabs using SP slabs and concrete pouring.

[0010] To achieve the above objectives, the present invention provides a composite floor slab: comprising multiple SP slabs arranged side by side, wherein multiple horizontally arranged hollow holes are provided on the two end faces of the SP slabs, and the SP slabs are formed into a whole by casting a composite layer on top of them. The key feature is that: two adjacent SP slabs are connected by slab side connectors, and multiple vertical holes are provided on the upper surface near both ends of the SP slabs. The vertical holes are arranged in an array directly above the hollow holes and communicate with the corresponding hollow holes. Slab end connectors are also installed between the hollow holes and the corresponding set of vertical holes.

[0011] As a preferred embodiment of the present invention, the plate end connector includes a C-shaped component and at least two movable plugs. Multiple sets of snap-fit ​​posts are arranged horizontally on the frame on the upper and lower sides of the C-shaped component, and each movable plug is inserted into a corresponding set of snap-fit ​​posts in the vertical direction.

[0012] As a preferred embodiment of the present invention, the movable plug-in includes a grooved steel plate, the groove of which extends out of the lower end of the steel plate. Two L-shaped steel plates are slidably installed on the surface of the grooved steel plate. The two L-shaped steel plates are respectively located on both sides of the groove in the grooved steel plate and can slide along both sides. The lateral extension portions of the two L-shaped steel plates are arranged opposite each other and can close the lower end groove of the grooved steel plate.

[0013] As a preferred embodiment of the present invention, the longitudinal portion of the L-shaped steel plate is provided with multiple transverse sliding grooves, and multiple sets of limiting rods are fixedly installed on the surface of the grooved steel plate. The multiple sets of limiting rods are respectively located on both sides of the groove in the grooved steel plate, and the multiple sets of limiting rods are respectively located in the multiple transverse sliding grooves.

[0014] As a preferred embodiment of the present invention, springs are connected between the limiting rod and the L-shaped steel plate respectively, and the L-shaped steel plates are pulled together by the tension of the springs. An inlet is also formed on the lower end face of the transverse part of the two L-shaped steel plates.

[0015] As a preferred technical solution of the present invention, the plate side connector includes angle steel embedded on both sides of the SP plate surface. One side of the angle steel is located inside the SP plate, and the other side is attached to the SP plate surface, with the end face flush with the side of the SP plate. The angle steels on two adjacent SP plates are connected by connecting steel plates and inserting studs.

[0016] As a preferred embodiment of the present invention, the connecting steel plate is long and narrow, with holes at both ends of the plate surface for inserting the studs, and an X-shaped steel strip is welded onto the connecting steel plate.

[0017] Furthermore, another objective of this invention is to provide a construction method for composite floor slabs, the key of which is:

[0018] S1: Prefabricated SP plate, side connector and end connector, wherein the SP plate has hollow holes, vertical holes and angle steel for setting the side connector;

[0019] S2: Place the prefabricated SP plate on the prefabricated beam and insert the plate end connector between the hollow hole and the vertical hole;

[0020] S3: Two adjacent SP plates are brought close together and connected by the plate side connectors;

[0021] S4: Cast composite layer.

[0022] As a preferred technical solution of the present invention, in step S1, an SP plate with hollow holes is produced by setting a core mold assembly, and after forming, an angle steel is inserted, and when the solidification reaches a predetermined strength, the vertical hole is formed by drilling.

[0023] As a preferred technical solution of the present invention, in step S2, the C-shaped component in the plate end connector is first inserted between the hollow hole and the upper surface wall of the SP plate, and the snap-fit ​​post on the C-shaped component is aligned with the position of the vertical hole, and the movable plug is inserted into the vertical hole to snap onto the snap-fit ​​post.

[0024] This invention provides a composite floor slab and its construction method, which has the following beneficial effects:

[0025] 1. In the composite floor slab of the present invention, the connection between adjacent SP plates, the end of the SP plate and the precast beam, and the SP plate and the composite layer is more stable and firm, and is less prone to brittle failure under earthquake, thus enhancing the reliability of the composite floor slab.

[0026] 2. In the construction of floor slabs, the 4mm rough surface on the top of the slab can be eliminated, simplifying the production process, reducing production difficulty, and saving production costs.

[0027] 3. Through simple and efficient connections, the overall integrity of the floor slab is enhanced without significantly increasing production and construction difficulties or affecting the construction schedule. Attached Figure Description

[0028] Figure 1 is a schematic diagram of the structure of an SP board in the prior art;

[0029] Figure 2 is a structural schematic diagram of a composite floor slab in the prior art;

[0030] Figure 3 is a structural schematic diagram of the composite floor slab provided in a specific embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of the SP board provided in a specific embodiment of the present invention;

[0032] Figure 5 is a structural schematic diagram of the plate end connector provided in a specific embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of the structure of the active plug-in provided in a specific embodiment of the present invention;

[0034] Figure 7 is a structural schematic diagram of the connection node between the composite floor slab and the precast beam provided in a specific embodiment of the present invention;

[0035] Figure 8 is a schematic diagram of the angle steel installation structure provided in a specific embodiment of the present invention;

[0036] Figure 9 is a structural schematic diagram of the plate-side connector provided in a specific embodiment of the present invention;

[0037] Figure 10 is a schematic diagram of the installation of the composite floor slab and precast beam provided in a specific embodiment of the present invention;

[0038] Figure 11 is a structural schematic diagram of the SP plate side connection point shown in region A of Figure 10 according to a specific embodiment of the present invention.

[0039] In the diagram: 1. Composite floor slab; 2. SP slab; 21. Hollow hole; 22. Vertical hole; 3. Composite layer; 4. Side connector; 41. Angle steel; 42. Connecting steel plate; 43. X-shaped steel bar; 44. Stud; 5. End connector; 51. C-shaped component; 52. Clip-on column; 54. Movable insert; 55. Channeled steel plate; 56. L-shaped steel plate; 57. Spring; 58. Limiting bar; 6. Rough surface; 7. Precast beam; 8. Side keyway. Detailed Implementation

[0040] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0041] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] Referring to Figures 3 and 4, the present invention provides a technical solution: a composite floor slab, comprising multiple SP slabs 2 arranged side by side, with multiple horizontally arranged hollow holes 21 on the two end faces of the SP slabs 2. The SP slabs 2 are formed integrally by casting a composite layer 3 on top. The key feature is that adjacent SP slabs 2 are connected by side connectors 4. Multiple vertical holes 22 are formed on the upper surface near both ends of the SP slabs 2. These vertical holes 22 are arranged in an array directly above the hollow holes 21 and communicate with the corresponding hollow holes 21. A plate end connector 5 is also installed between the hollow holes 21 and the corresponding set of vertical holes 22. Through the use of the side connectors 4, adjacent SP slabs 21 are connected by side connectors 5. The connection between the two SP plates 2 is more secure. At the same time, the side connector 4 increases the surface roughness of the SP plate 2, making the connection between the SP plate 2 and the composite layer 3 more secure. By using the end connector 5, after the composite layer 3 is poured, the concrete enters the vertical hole 22 and the hollow hole 21. The end connector 5 can act as a skeleton, making the connection between the end of the SP plate and the precast beam 7 more secure. At the same time, the composite layer 3 enters the vertical hole 22 and the hollow hole 21, making the SP plate and the composite layer 3 form a more secure whole. The side keyway 8 is set on the side of the SP plate 2, and the concrete of the composite layer 3 is poured into it, further strengthening the connection between the two adjacent SP plates 2.

[0044] Referring to Figure 5, the plate end connector 5 includes a C-shaped component 51 and at least two movable inserts 54. Multiple sets of snap-fit ​​posts 52 are arranged horizontally on the frame on the upper and lower sides of the C-shaped component 51. Each movable insert 54 is inserted vertically into the corresponding set of snap-fit ​​posts 52. The snap-fit ​​posts 52 used for snap-fit ​​can be set with smooth outer walls, and the snap-fit ​​posts 52 not used for snap-fit ​​can be provided with threaded grooves. After the concrete is poured, it can increase the stress points of the plate end connector 5 and make the connection more secure.

[0045] When installing the plate end connector 5, as shown in Figure 7, one side of the C-shaped component 51 is inserted into the hollow hole 21, and the other side of the component is located on the upper surface of the SP plate 2. The movable plug 54 is inserted into the corresponding vertical hole 22, so that the movable plug 54 is snapped onto the snap-fit ​​post 52 of the C-shaped component 51, thereby fixing the plate end connector 5 in place.

[0046] Referring to Figure 6, the movable plug-in 54 includes a grooved steel plate 55, the groove of which extends out of the lower end of the steel plate. Two L-shaped steel plates 56 are slidably installed on the surface of the grooved steel plate 55. The two L-shaped steel plates 56 are located on both sides of the groove in the grooved steel plate 55 and can slide in both directions. The lateral extensions of the two L-shaped steel plates 56 are arranged opposite each other and can close the lower end groove of the grooved steel plate 55.

[0047] The L-shaped steel plate 56 has multiple transverse sliding grooves on its longitudinal section. The grooved steel plate 55 has multiple sets of limiting rods 58 fixedly installed on its surface. The multiple sets of limiting rods 58 are located on both sides of the groove in the grooved steel plate 55 and in multiple transverse sliding grooves. Through the transverse sliding grooves on the L-shaped steel plate 56 and the limiting rods 58 on the surface of the grooved steel plate 55, this method enables the two L-shaped steel plates 56 to slide back and forth on both sides of the groove in the grooved steel plate 55.

[0048] Springs 57 are connected between the limiting rod 58 and the L-shaped steel plate 56 respectively. The L-shaped steel plates 56 are pulled together by the tension of the springs 57. The lower end face of the horizontal part of the two L-shaped steel plates 56 also forms an inlet. The lower end face of the horizontal part of the two L-shaped steel plates 56 can be set as an arc or a wedge, so that it forms an entrance that is wider at the bottom and narrower at the top. During the insertion of the movable plug 54, when the inlet contacts the locking post 52, the two L-shaped steel plates 56 move downward and move to both sides by force. At this time, the springs 57 are further stretched. As shown in Figure 5, after the locking post 52 enters the groove of the grooved steel plate 55, the two L-shaped steel plates 56 slide again under the tension of the springs 57 to close the lower end of the groove of the grooved steel plate 55, so that the movable plug 54 is locked on the C-shaped component 51.

[0049] As shown in Figures 8, 9, and 11, the side connector 4 includes angle steel 41 embedded on both sides of the surface of the SP plate 2. One side of the angle steel 41 is located inside the SP plate 2, and the other side is attached to the surface of the SP plate 2, with the end face flush with the side of the SP plate 2. The angle steel 41 on two adjacent SP plates 2 are connected by inserting studs 44 through the connecting steel plate 42. During installation, the angle steel 41 and the connecting steel plate 42 are connected into one piece by the studs 44, thereby fixing the two adjacent SP plates 2 together. Multiple side connectors 4 can be used at the same time to increase the strength of the connection.

[0050] Among them, the connecting steel plate 42 is long and narrow, and holes for inserting studs 44 are opened at both ends of the connecting steel plate 42. X-shaped steel bars 43 are also welded on the connecting steel plate 42. The X-shaped steel bars 43 are used to improve the horizontal seismic shear resistance.

[0051] Referring to Figure 10, for the construction and installation of composite floor slabs 1, the present invention provides another technical solution, a construction method for composite floor slabs, the key of which is:

[0052] S1: Precast SP plate 2, side connector 4 and end connector 5, SP plate 2 has hollow holes 21, vertical holes 22 and angle steel 41 for setting the side connector 4;

[0053] S2: Place the precast SP plate 2 on the precast beam 7, and insert the plate end connector 5 between the hollow hole 21 and the vertical hole 22;

[0054] S3: Two adjacent SP plates 2 are pressed together and connected by the plate side connector 4;

[0055] S4: Cast composite layer 3;

[0056] In step S1, an SP plate 2 with hollow holes 21 is produced by setting a core mold assembly. After forming, an angle steel 41 is inserted, and when the solidification reaches the predetermined strength, a vertical hole 22 is formed by drilling.

[0057] In step S2, the C-shaped component 51 in the plate end connector 5 is first inserted between the hollow hole 21 and the upper surface wall of the SP plate 2, and the snap-fit ​​post 52 on the C-shaped component 51 is aligned with the position of the vertical hole 22. The movable plug 54 is then inserted into the vertical hole 22 and snapped onto the snap-fit ​​post 52.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A composite floor slab, comprising multiple SP slabs (2) arranged side by side, wherein multiple horizontally arranged hollow holes (21) are provided on the two end faces of the SP slabs (2), and the SP slabs (2) are integrally formed by casting a composite layer (3) on top of them, characterized in that: Two adjacent SP plates (2) are connected by a plate side connector (4). Multiple vertical holes (22) are provided on the upper surface near both ends of the SP plates (2). The vertical holes (22) are arranged in an array directly above the hollow holes (21) and communicate with the corresponding hollow holes (21). Plate end connectors (5) are also installed between the hollow holes (21) and the corresponding set of vertical holes (22). The plate end connectors (5) include C-shaped components (51) and at least two movable plugs (54). Multiple sets of snap-fit ​​posts (52) are arranged horizontally on the frame on the upper and lower sides of the C-shaped components (51). Each movable plug (54) is inserted vertically into the corresponding set of snap-fit ​​posts (52). The movable plug (54) includes a grooved steel plate (55). The groove of the grooved steel plate (55) extends out of the lower end of the steel plate. The grooved steel plate (55) slides on the plate surface. Two L-shaped steel plates (56) are dynamically installed. The two L-shaped steel plates (56) are located on both sides of the groove in the grooved steel plate (55) and can slide along both sides. The lateral extensions of the two L-shaped steel plates (56) are arranged opposite each other and can close the lower end groove of the grooved steel plate (55). The longitudinal part of the L-shaped steel plate (56) has multiple transverse sliding grooves. Multiple sets of limiting rods (58) are fixedly installed on the surface of the grooved steel plate (55). The multiple sets of limiting rods (58) are located on both sides of the groove in the grooved steel plate (55) and in the multiple transverse sliding grooves. Springs (57) are connected between the limiting rods (58) and the L-shaped steel plates (56). The L-shaped steel plates (56) are pulled together by the tension of the springs (57). The lower end surfaces of the lateral parts of the two L-shaped steel plates (56) also form inlet openings.

2. The composite floor slab according to claim 1, characterized in that: The plate side connector (4) includes angle steel (41) pre-embedded on both sides of the surface of the SP plate (2). One side of the angle steel (41) is located inside the SP plate (2), and the other side is attached to the surface of the SP plate (2). The end face is flush with the side of the SP plate (2). The angle steel (41) on two adjacent SP plates (2) are connected by inserting studs (44) through the connecting steel plate (42).

3. The composite floor slab according to claim 2, characterized in that: The connecting steel plate (42) is long and narrow, and holes for inserting the studs (44) are provided at both ends of the connecting steel plate (42). An X-shaped steel strip (43) is also welded on the connecting steel plate (42).

4. A construction method for a composite floor slab, using the composite floor slab as described in any one of claims 1-3, characterized in that, The process includes the following steps: S1: Prefabricating SP plates (2), side connectors (4), and end connectors (5), wherein the SP plate (2) has hollow holes (21), vertical holes (22), and angle steel (41) for setting the side connectors (4); S2: Placing the prefabricated SP plates (2) on the prefabricated beam (7), and inserting the end connectors (5) between the hollow holes (21) and the vertical holes (22); S3: Bringing two adjacent SP plates (2) together and connecting them through the side connectors (4); S4: Casting the composite layer (3).

5. The construction method for composite floor slabs according to claim 4, characterized in that, In step S1, an SP plate (2) with hollow holes (21) is produced by setting a core mold assembly. After forming, an angle steel (41) is inserted, and when the solidification reaches the predetermined strength, the vertical hole (22) is formed by drilling.

6. The construction method for composite floor slabs according to claim 4, characterized in that, In step S2, the C-shaped component (51) in the plate end connector (5) is first inserted between the hollow hole (21) and the upper surface wall of the SP plate (2), and the snap-fit ​​post (52) on the C-shaped component (51) is aligned with the position of the vertical hole (22). The movable plug (54) is inserted from the vertical hole (22) to snap onto the snap-fit ​​post (52).

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