A composite floor slab and its construction method

Abstract

The present invention discloses a composite floor slab and a construction method thereof. The composite floor slab includes a bottom plate unit, a steel mesh, and a concrete layer. The bottom plate unit is laid between two adjacent steel beams. The bottom plate unit includes a plurality of shrinkage-type profiled steel sheets arranged along the length direction of the steel beam. The shrinkage-type profiled steel sheet is provided with a plurality of shrinkage ribs along the length direction of the steel beam. One end of the shrinkage-type profiled steel sheet in the length direction of the steel beam is provided with a male rib edge, and the other end is provided with a female rib edge. Among two adjacent shrinkage-type profiled steel sheets, the female rib edge of one shrinkage-type profiled steel sheet is connected to the male rib edge of the other shrinkage-type profiled steel sheet. The steel mesh is laid on the bottom plate unit, and the concrete layer is poured on the bottom plate unit and covers the steel mesh. According to the composite floor slab and the construction method thereof of the present invention, not only is the construction process of the floor slab simpler, the construction period shorter, and the labor cost lower, but also the fire prevention effect is better.

Description

Technical Field

[0001] The present invention relates to a building floor technology, and particularly to a composite floor slab and a construction method thereof. Background Art

[0002] Steel structure buildings are a type of prefabricated buildings, which have the advantages of rich shapes, high factory prefabrication, fast assembly construction speed, excellent material properties, recyclable materials, and low comprehensive cost. Steel structure buildings mainly include steel columns, steel beams arranged on the steel columns, and floor slabs laid on the steel beams.

[0003] Traditional floor slabs are generally steel bar truss floor formwork. The steel bar truss floor formwork mainly includes a flat bottom formwork steel plate laid on the steel beam. Reinforcing steel bar trusses are welded to the upper end surface of the bottom formwork steel plate. Bottom reinforcement and surface reinforcement are interspersed and tied to the steel bar trusses. Finally, concrete is poured on the bottom formwork steel plate to form the floor slab. The traditional floor slab has the following disadvantages: Since the flat bottom formwork steel plate has low structural strength and the steel bar trusses are heavy, in order to avoid excessive downward deflection of the bottom formwork steel plate during the concrete pouring process, a falsework support frame needs to be erected below the bottom formwork steel plate. In addition, in order to increase the structural strength, bottom reinforcement is also interspersed and tied to the steel bar trusses to cooperate with the bottom formwork steel plate for support. As a result, during the construction process of the floor slab, the processes are complex, the construction period is long, and the labor cost is high. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, in a first aspect, the present invention provides a composite floor slab, which has simpler processes, shorter construction period, and lower labor cost during the construction process of the floor slab.

[0005] In addition, in a second aspect, the present invention also provides a construction method for the composite floor slab.

[0006] The composite floor slab according to the embodiment of the first aspect of the present invention includes:

[0007] A bottom plate unit, laid between two adjacent steel beams. The bottom plate unit includes a plurality of shrinkage-mouth profiled steel plates arranged along the length direction of the steel beam. The shrinkage-mouth profiled steel plate is provided with a plurality of shrinkage ribs along the length direction of the steel beam. One end of the shrinkage-mouth profiled steel plate in the length direction of the steel beam is provided with a male rib edge, and the other end is provided with a female rib edge. Among two adjacent shrinkage-mouth profiled steel plates, the female rib edge of one shrinkage-mouth profiled steel plate is connected to the male rib edge of the other shrinkage-mouth profiled steel plate;

[0008] A steel mesh, laid on the bottom plate unit;

[0009] A concrete layer, poured on the bottom plate unit and covering the steel mesh.

[0010] The composite floor slab according to the embodiment of the first aspect of the present invention has at least the following technical effects:

[0011] When it is necessary to construct the composite floor slab of the embodiment of the present invention, the bottom plate unit can be laid between two adjacent steel beams. The bottom plate unit includes a plurality of reduced-orifice profiled steel sheets. The plurality of reduced-orifice profiled steel sheets can be arranged in sequence along the length direction of the steel beam. Then, the mother rib side of the reduced-orifice profiled steel sheet is connected to the male rib side of another adjacent reduced-orifice profiled steel sheet. After that, the steel mesh is laid on the bottom plate unit, and finally, the concrete layer is poured on the bottom plate unit and the concrete layer is made to cover the steel mesh to complete the construction of the composite floor slab. For the composite floor slab according to the embodiment of the present invention, since the reduced-orifice profiled steel sheet is provided with a plurality of reduced ribs, and two adjacent reduced-orifice profiled steel sheets are connected through the corresponding male rib side and mother rib side, the overall structural strength of the bottom plate unit is higher, so that it is not necessary to erect a back support frame under the bottom plate unit, nor to lay bottom reinforcement. Only one layer of steel mesh (equivalent to the top reinforcement) needs to be laid, the process is simpler, the construction period is shorter, the labor cost is lower, and the material consumption is less. In addition, the reduced-orifice profiled steel sheet is provided with a plurality of reduced ribs, so that the contact area with the concrete layer is larger, and thus the heat can be transferred to the concrete layer more quickly. Moreover, the reduced rib is a reduced structure, which can effectively reduce the exposed fire area of the reduced-orifice profiled steel sheet, so that the fire protection effect of the reduced-orifice profiled steel sheet is better. Therefore, it is not necessary to apply fireproof paint on the surface of the reduced-orifice profiled steel sheet, and the practicability is better.

[0012] According to some embodiments of the present invention, a support frame is provided on the bottom plate unit, and the support frame is used to support the steel mesh and make the steel mesh located above the bottom plate unit.

[0013] According to some embodiments of the present invention, the support frame includes a plurality of V-shaped steel bars. The two ends in the length direction of the V-shaped steel bar are inserted into the corner position between the outer side wall of one of the reduced ribs and the upper end surface of the reduced-orifice profiled steel sheet. The middle position in the length direction of the V-shaped steel bar abuts against the top end of another adjacent reduced rib, and the steel mesh is carried on the middle position in the length direction of the V-shaped steel bar.

[0014] According to some embodiments of the present invention, the two ends in the length direction of the reduced rib are filled with a plugging member.

[0015] According to some embodiments of the present invention, the plugging member is prepared from a polyurethane foaming agent.

[0016] According to some embodiments of the present invention, among two adjacent reduced-orifice profiled steel sheets, the mother rib side of one of the reduced-orifice profiled steel sheets is connected to the male rib side of the other reduced-orifice profiled steel sheet by self-tapping screws.

[0017] According to some embodiments of the present invention, the male rib edge includes a male rib vertical edge provided at one end of the necked-in profiled steel sheet, the top end of the male rib vertical edge is bent downward to form a male rib arc edge, the female rib edge includes a female rib vertical edge provided at the other end of the necked-in profiled steel sheet, the top end of the female rib vertical edge is bent downward to form a female rib arc edge, the female rib vertical edge fits against the corresponding male rib vertical edge, and the female rib arc edge covers the corresponding male rib arc edge.

[0018] According to some embodiments of the present invention, the necked-in profiled steel sheet is provided with a plurality of convex strips, and the convex strips extend along the length direction of the necked rib.

[0019] The construction method for a composite floor according to the second aspect embodiment of the present invention includes the following steps:

[0020] S1. Laying the bottom plate unit: Laying a plurality of necked-in profiled steel sheets along the length direction of the steel beam between two adjacent steel beams. Among two adjacent necked-in profiled steel sheets, the female rib edge of one necked-in profiled steel sheet is connected to the male rib edge of the other necked-in profiled steel sheet, and then sealing members are filled at both ends in the length direction of the necked rib;

[0021] S2. Laying the steel mesh: Laying the steel mesh on the bottom plate unit;

[0022] S3. Pouring the concrete layer: Pouring the concrete layer on the bottom plate unit and making the concrete layer cover the steel mesh.

[0023] The construction method for a composite floor according to the second aspect embodiment of the present invention has at least the following technical effects: Not only is the construction process of the floor simpler, the construction period shorter, the labor cost lower, and the material consumption less, but also the fireproof effect of the floor is better.

[0024] According to some embodiments of the present invention, in step S2, first, a support frame is arranged on the upper end of the bottom plate unit, and then the steel mesh is laid on the support frame so that the steel mesh is located above the bottom plate unit.

[0025] According to some embodiments of the present invention, in step S2, the support frame includes a plurality of V-shaped steel bars. The two ends in the length direction of the V-shaped steel bar are inserted into the corner position between the outer side wall of one necked rib and the upper end surface of the necked-in profiled steel sheet, the middle position in the length direction of the V-shaped steel bar abuts against the top end of another adjacent necked rib, and the steel mesh is carried on the middle position in the length direction of the V-shaped steel bar.

[0026] According to some embodiments of the present invention, in step S3, when pouring the concrete layer, pour the concrete directly above the steel beam and spread the concrete around.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 is a schematic diagram of the structure of the steel bar mesh carried on the support frame;

[0031] Figure 3 is a schematic diagram of the structure of the bottom plate unit;

[0032] Figure 4 is a schematic diagram of the structure after the support frame is installed on the bottom plate unit;

[0033] Figure 5 is Figure 4 a partial enlarged view of;

[0034] REFERENCE SIGNS:

[0035] Bottom plate unit 100, necked-down profiled steel sheet 101, necked-down rib 102, male rib edge 103, female rib edge 104, V-shaped steel bar 105, plugging member 106, self-tapping screw 107, male rib vertical edge 108, male rib arc edge 109, female rib vertical edge 110, female rib arc edge 111, rib 112; steel bar mesh 200; concrete layer 300; water and electricity pipelines 400; steel beam 500, stud 501. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, and the meaning of "a plurality of groups" is two or more groups.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Next, reference is made to Figures 1 to 5 Describe a composite floor slab and its construction method according to an embodiment of the present invention.

[0040] The composite floor slab according to the first aspect embodiment of the present invention, as Figures 1 to 5 shown, includes a bottom plate unit 100, a steel mesh 200, and a concrete layer 300. The bottom plate unit 100 is laid between two adjacent steel beams 500. The bottom plate unit 100 includes a plurality of reduced-orifice profiled steel sheets 101 arranged along the length direction of the steel beam 500. The reduced-orifice profiled steel sheet 101 is provided with a plurality of reduced-orifice ribs 102 along the length direction of the steel beam 500. One end of the reduced-orifice profiled steel sheet 101 in the length direction of the steel beam 500 is provided with a male rib edge 103, and the other end is provided with a female rib edge 104. Among two adjacent reduced-orifice profiled steel sheets 101, the female rib edge 104 of one reduced-orifice profiled steel sheet 101 is connected to the male rib edge 103 of the other reduced-orifice profiled steel sheet 101. The steel mesh 200 is laid on the bottom plate unit 100, and the concrete layer 300 is poured on the bottom plate unit 100 and covers the steel mesh 200.

[0041] In this embodiment, when constructing the composite floor slab of the present invention, the bottom plate unit 100 can be laid between two adjacent steel beams 500. The bottom plate unit 100 includes a plurality of fluted profiled steel sheets 101. The plurality of fluted profiled steel sheets 101 can be arranged in sequence along the length direction of the steel beam 500. Then, the female rib side 104 of the fluted profiled steel sheet 101 is connected to the male rib side 103 of another adjacent fluted profiled steel sheet 101. After that, the steel mesh 200 is laid on the bottom plate unit 100. Finally, the concrete layer 300 is poured on the bottom plate unit 100 and the concrete layer 300 is made to cover the steel mesh 200 to complete the construction of the composite floor slab. According to the composite floor slab of the embodiment of the present invention, since the fluted profiled steel sheet 101 is provided with a plurality of fluted ribs 102, and two adjacent fluted profiled steel sheets 101 are connected through the corresponding male rib side 103 and female rib side 104, the overall structural strength of the bottom plate unit 100 is higher. Thus, it is not necessary to erect a falsework support under the bottom plate unit 100, nor is it necessary to lay bottom reinforcement. Only one layer of steel mesh 200 (equivalent to the top reinforcement) needs to be laid, the process is simpler, the construction period is shorter, the labor cost is lower, and the material consumption is less. In addition, the fluted profiled steel sheet 101 is provided with a plurality of fluted ribs 102, so that the contact area with the concrete layer 300 is larger, and thus the heat can be transferred to the concrete layer 300 more quickly. Moreover, the fluted rib 102 is a fluted structure, which can effectively reduce the exposed fire area of the profiled steel sheet, so that the fire prevention effect of the fluted profiled steel sheet 101 is better. Therefore, it is not necessary to apply fireproof coating on the surface of the fluted profiled steel sheet 101, and the practicability is better.

[0042] It should be noted that, first of all, the fluted profiled steel sheet 101 is a relatively common profiled steel sheet in the construction industry, and its structure will not be elaborated here. There are various models of the fluted profiled steel sheet 101. In this embodiment, the fluted profiled steel sheet 101 with the model of YXB54 - 200 - 600(S) and the material of G550 is preferably selected. Secondly, after the fluted profiled steel sheet 101 is laid on the steel beam 500, the fluted profiled steel sheet 101 needs to be fixed on the steel beam 500 with stud bolts 501. In addition, before laying the steel mesh 200, the embedded parts such as the water and electricity pipelines 400 need to be installed on the fluted profiled steel sheet 101 through fixed pipe clamps and screws. In order to avoid bending of the water and electricity pipelines 400, the water and electricity pipelines 400 can be installed on the trough surface between two adjacent fluted ribs 102 of the fluted profiled steel sheet 101 along the length direction of each fluted rib 102, or installed on the trough surface between the male rib side 103 and its adjacent fluted rib 102, or installed on the trough surface between the female rib side 104 and its adjacent fluted rib 102. Of course, it can also be installed on the top ends of a plurality of fluted ribs 102 along the direction perpendicular to the length direction of the fluted rib 102.

[0043] In some embodiments of the present invention, a support frame is provided on the bottom plate unit 100. The support frame is used to support the steel mesh 200 and make the steel mesh 200 located above the bottom plate unit 100. By providing the support frame, a gap is reserved between the steel mesh 200 and the bottom plate unit 100, which not only enables the concrete layer 300 to fully cover the steel mesh 200, thereby making the strength of the reinforced concrete structure composed of the concrete layer 300 and the steel mesh 200 higher, but also enables the concrete layer 300 to fully fit the shrinkage-type profiled steel sheet 101, making the heat dissipation and fire prevention effects of the shrinkage-type profiled steel sheet 101 better. In addition, the steel mesh 200 is located at a suitable position above the bottom plate unit 100, so that the thickness of the steel bar protection layer between the steel mesh 200 and the top of the concrete layer 300 is within a suitable range, neither causing the steel mesh 200 to be easily exposed due to too small a protection layer thickness, nor causing too large a gap after cracks appear and wasting concrete materials due to too large a protection layer thickness.

[0044] In some embodiments of the present invention, as Figures 1 to 5 shown, the support frame includes a plurality of V-shaped steel bars 105. The two ends of the V-shaped steel bars 105 in the length direction are inserted into the corner position between the outer side wall of one of the shrinkage ribs 102 and the upper end surface of the shrinkage-type profiled steel sheet 101. The middle position of the V-shaped steel bars 105 in the length direction abuts against the top of another adjacent shrinkage rib 102. The steel mesh 200 is carried on the middle position of the V-shaped steel bars 105 in the length direction. The shrinkage rib 102 is a shrinkage structure, that is, the two side walls of the shrinkage rib 102 extend upward in a direction away from each other. The included angle between the outer side wall of the shrinkage rib 102 and the upper end surface of the shrinkage-type profiled steel sheet 101 is an acute angle. Therefore, after the steel mesh 200 is carried on the middle position of the V-shaped steel bars 105 in the length direction, even if the V-shaped steel bars 105 are subjected to the gravity of the steel mesh 200, the two ends of the V-shaped steel bars 105 in the length direction will not move out of the corner position between the outer side wall of the shrinkage rib 102 and the upper end surface of the shrinkage-type profiled steel sheet 101. Therefore, in this embodiment, when it is necessary to support the steel mesh 200, only the two ends of the V-shaped steel bars 105 in the length direction need to be inserted into the corner position between the outer side wall of one of the shrinkage ribs 102 and the upper end surface of the shrinkage-type profiled steel sheet 101, the middle position of the V-shaped steel bars 105 in the length direction abuts against the top of another adjacent shrinkage rib 102, and then the steel mesh 200 is placed on the middle position of the V-shaped steel bars 105 in the length direction. The operation is convenient, time-saving and labor-saving, and the support effect is good. It should be noted that the support frame can also be other structures. For example, it can include a plurality of U-shaped frames arranged on the upper end surface of the shrinkage-type profiled steel sheet 101.

[0045] In some embodiments of the present invention, as Figure 1 and Figure 5As shown, plugging members 106 are filled at both ends of the necking rib 102 in the length direction. Since both ends of the necking rib 102 are open in the length direction, and the bottom of the necking rib 102 is also open, when pouring concrete, the concrete easily enters the inside of the necking rib 102 from both ends in the length direction of the necking rib 102 and then leaks out from the bottom of the necking rib 102. In this embodiment, plugging members 106 are filled at both ends of the necking rib 102 in the length direction, and the plugging members 106 can prevent the concrete from entering the necking rib 102 and causing slurry leakage, and have good practicability.

[0046] In some embodiments of the present invention, the plugging member 106 is prepared from polyurethane foaming agent. The polyurethane foaming agent can be filled through an aerosol can, and the filling is convenient. Moreover, the polyurethane foaming agent has high bonding strength and good plugging effect. Of course, the plugging member 106 can also be prepared from other materials. For example, it can be prepared from foam.

[0047] In some embodiments of the present invention, as Figures 2 to 5 shown, among two adjacent necking profiled steel sheets 101, the mother rib edge 104 of one necking profiled steel sheet 101 is connected to the male rib edge 103 of the other necking profiled steel sheet 101 through self-tapping screws 107. The mother rib edge 104 and the male rib edge 103 can be fixedly connected through a plurality of self-tapping screws 107, and the plurality of self-tapping screws 107 are arranged along the length directions of the mother rib edge 104 and the male rib edge 103. Through the fixed connection by the self-tapping screws 107, the connection is convenient and the connection effect is good. Of course, the mother rib edge 104 and the male rib edge 103 can also be connected in other directions. For example, the mother rib edge 104 and the male rib edge 103 can be welded or connected by bolts.

[0048] In some embodiments of the present invention, as Figure 3As shown, the male rib edge 103 includes a male rib vertical edge 108 provided at one end of the necked-down profiled steel sheet 101. The top end of the male rib vertical edge 108 bends downward to form a male rib arc edge 109. The female rib edge 104 includes a female rib vertical edge 110 provided at the other end of the necked-down profiled steel sheet 101. The top end of the female rib vertical edge 110 bends downward to form a female rib arc edge 111. The female rib vertical edge 110 fits against the corresponding male rib vertical edge 108, and the female rib arc edge 111 wraps around the corresponding male rib arc edge 109. Furthermore, in addition to being connected by self-tapping screws 107, the female rib edge 104 and the male rib edge 103 also increase the structural strength after the connection of two adjacent necked-down profiled steel sheets 101 by the female rib vertical edge 110 fitting against the male rib vertical edge 108 and the female rib arc edge 111 wrapping around the male rib arc edge 109. In addition, the gap between the female rib edge 104 and the male rib edge 103 is small, thus being able to reduce the occurrence of grout leakage between the female rib edge 104 and the male rib edge. It should be noted that when the gap between the female rib edge 104 and the male rib edge 103 is large due to reasons such as manufacturing accuracy and installation accuracy, a sealing member 106 can also be filled between the female rib edge 104 and the male rib edge 103.

[0049] In some embodiments of the present invention, as Figure 2 and Figure 3 shown, the necked-down profiled steel sheet 101 is provided with a plurality of ribs 112, and the ribs 112 extend along the length direction of the necked-down rib 102. By providing the ribs 112, the structural strength of the necked-down profiled steel sheet 101 itself can be further enhanced, and the load-bearing capacity and service life are longer.

[0050] According to the construction method for a composite floor slab according to the second aspect embodiment of the present invention, it includes the following steps:

[0051] S1. Laying the bottom plate unit 100: Laying a plurality of necked-down profiled steel sheets 101 along the length direction of the steel beam 500 between two adjacent steel beams 500. Among two adjacent necked-down profiled steel sheets 101, the female rib edge 104 of one necked-down profiled steel sheet 101 is connected to the male rib edge 103 of the other necked-down profiled steel sheet 101, and then sealing members 106 are filled at both ends in the length direction of the necked-down rib 102;

[0052] S2. Laying the steel mesh 200: Laying the steel mesh 200 on the bottom plate unit 100;

[0053] S3. Pouring the concrete layer 300: Pouring the concrete layer 300 onto the bottom plate unit 100 and making the concrete layer 300 wrap around the steel mesh 200.

[0054] According to the construction method for a composite floor slab of the present invention, not only is the construction process of the floor slab simpler, the construction period shorter, the labor cost lower, and the material consumption less, but also the fire prevention effect of the floor slab is better.

[0055] It should be noted that before construction, profiled steel sheets need to be selected. In the present invention, the fluted profiled steel sheet 101 is selected. The model of the fluted profiled steel sheet 101 is preferably YXB54-200-600(S), and the material is preferably G550. This kind of fluted profiled steel sheet 101 has better fireproof effect and there is no need to apply fireproof coating on the surface of the fluted profiled steel sheet 101, so the practicability is better. Before construction, it is necessary to carry out in-depth design of the profiled steel sheet layout according to the specific situation of the floor. Each floor should have a corresponding profiled steel sheet layout design drawing. When the profiled steel sheet is pressed and installed on site, the work is carried out based on the layout design drawing. When laying the bottom plate unit 100, within the same floor plane, the inner fluted profiled steel sheet 101 is laid first, and then the outer fluted profiled steel sheet 101 is laid. For different floors, the bottom plate unit 100 of the upper floor is laid first, and then the bottom plate unit 100 of the lower floor is laid. After the fluted profiled steel sheet 101 is laid on the steel beam 500, the trough position of the fluted profiled steel sheet 101 and the upper end surface of the steel beam 500 can be spot-welded for positioning, and then the fluted profiled steel sheet 101 is further fixed on the steel beam 500 through the stud 501. After laying the bottom plate unit 100, in order to prevent the staff from damaging the bottom plate unit 100 during construction on the bottom plate unit 100, a cushion plate can be laid on the bottom plate unit 100, and the staff walks on the cushion plate. Before pouring the concrete layer 300, sealing members 106 can be filled at both ends of the fluted rib 102 in the length direction. The sealing members 106 can be prepared from polyurethane foaming agent, so as to reduce the occurrence of slurry leakage. The finishing of the concrete layer 300 adopts the principle of secondary finishing to avoid dry shrinkage cracks on the surface of the concrete layer 300. The finishing is carried out according to the dry and hard condition of the concrete layer 300. After the concrete layer 300 is vibrated, the first finishing is carried out in time with a wooden formwork. After the finishing, the plate surface elevation should be slightly higher than the design elevation by 5 mm. After 1 to 2 hours, when the concrete layer 300 is secondarily compacted and before the initial setting of the concrete layer 300, the second finishing is carried out with an iron formwork. During the finishing process, a laser level is used to determine the plate surface elevation to ensure that the plate surface elevation of the concrete layer 300 is consistent with the design elevation. Spraying film and watering conservation are carried out 12 hours after the concrete layer 300 is poured, and the conservation time is not less than 7 days. The watering frequency should ensure that the surface of the concrete layer 300 is in a wet state.

[0056] In some embodiments of the present invention, in step S2, first, a support frame is arranged at the upper end of the bottom plate unit 100, and then the steel bar mesh 200 is laid on the support frame so that the steel bar mesh 200 is located above the bottom plate unit 100.

[0057] In some embodiments of the present invention, in step S2, the support frame includes a plurality of V-shaped steel bars 105. The two ends of the V-shaped steel bars 105 in the length direction are inserted into the corner position between the outer side wall of one of the necking ribs 102 and the upper end surface of the necking profiled steel sheet 101. The middle position of the V-shaped steel bars 105 in the length direction abuts against the top end of another adjacent necking rib 102. The steel mesh 200 is carried on the middle position of the V-shaped steel bars 105 in the length direction.

[0058] In some embodiments of the present invention, in step S3, when pouring the concrete layer 300, pour the concrete directly above the steel beam 500 and spread the concrete around. When pouring the concrete, to avoid excessive accumulation of the concrete, which may cause excessive local deformation of the bottom plate unit 100, the pouring height of the concrete during feeding shall not exceed 1.2 m. In addition, pouring the concrete directly above the steel beam 500 and quickly spreading it around can further avoid excessive local deformation of the bottom plate unit 100.

[0059] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A composite floor slab, characterized in that, it comprises: a bottom plate unit (100) laid between two adjacent steel beams (500), the bottom plate unit (100) includes a plurality of necked profiled steel sheets (101) arranged along the length direction of the steel beam (500), the necked profiled steel sheet (101) is provided with a plurality of necked ribs (102) along the length direction of the steel beam (500), one end of the necked profiled steel sheet (101) in the length direction of the steel beam (500) is provided with a male rib edge (103), the other end is provided with a female rib edge (104), among two adjacent necked profiled steel sheets (101), the female rib edge (104) of one of the necked profiled steel sheets (101) is connected to the male rib edge (103) of the other necked profiled steel sheet (101); a steel bar mesh (200) laid on the bottom plate unit (100); a concrete layer (300) poured on the bottom plate unit (100) and covering the steel bar mesh (200); a support frame is arranged on the bottom plate unit (100), and the support frame is used for supporting the steel bar mesh (200) and making the steel bar mesh (200) located above the bottom plate unit (100); the support frame includes a plurality of V-shaped steel bars (105), both ends of the V-shaped steel bar (105) in the length direction are inserted into the corner position between the outer side wall of one of the necked ribs (102) and the upper end surface of the necked profiled steel sheet (101), the middle position of the V-shaped steel bar (105) in the length direction abuts against the top of another adjacent necked rib (102), and the steel bar mesh (200) is borne on the middle position of the V-shaped steel bar (105) in the length direction; sealing members (106) are filled at both ends of the necked rib (102) in the length direction, and the sealing members (106) are prepared from polyurethane foaming agent; among two adjacent necked profiled steel sheets (101), the female rib edge (104) of one of the necked profiled steel sheets (101) is connected to the male rib edge (103) of the other necked profiled steel sheet (101) by self-tapping screws (107).

2. The composite floor slab according to claim 1, characterized in that, the male rib edge (103) includes a male rib vertical edge (108) arranged at one end of the necked profiled steel sheet (101), the top end of the male rib vertical edge (108) is bent downward to form a male rib arc edge (109), the female rib edge (104) includes a female rib vertical edge (110) arranged at the other end of the necked profiled steel sheet (101), the top end of the female rib vertical edge (110) is bent downward to form a female rib arc edge (111), the female rib vertical edge (110) fits against the corresponding male rib vertical edge (108), and the female rib arc edge (111) covers the corresponding male rib arc edge (109).

3. A construction method for the composite floor slab according to claim 1, characterized in that, it includes the following steps: S1. Laying the bottom plate unit (100): Lay a plurality of corrugated steel sheets with reduced openings (101) along the length direction of the adjacent two steel beams (500) between the adjacent two steel beams (500). Among the adjacent two corrugated steel sheets with reduced openings (101), the mother rib side (104) of one of the corrugated steel sheets with reduced openings (101) is connected to the male rib side (103) of the other corrugated steel sheet with reduced openings (101). Then, fill the sealing members (106) at both ends of the reduced opening rib (102) in the length direction. S2. Laying the steel mesh (200): Lay the steel mesh (200) on the bottom plate unit (100). S3. Pouring the concrete layer (300): Pour the concrete layer (300) on the bottom plate unit (100) and make the concrete layer (300) cover the steel mesh (200). In step S2, first, set up a support frame at the upper end of the bottom plate unit (100), and then lay the steel mesh (200) on the support frame so that the steel mesh (200) is located above the bottom plate unit (100). The support frame includes a plurality of V-shaped steel bars (105). The two ends of the V-shaped steel bar (105) in the length direction are inserted into the corner position between the outer side wall of one of the reduced opening ribs (102) and the upper end surface of the corrugated steel sheet with reduced openings (101). The middle position of the V-shaped steel bar (105) in the length direction abuts against the top of the other adjacent reduced opening rib (102). The steel mesh (200) is carried on the middle position of the V-shaped steel bar (105) in the length direction.

4. The construction method according to claim 3, characterized in that, in step S3, when pouring the concrete layer (300), pour the concrete directly above the steel beam (500) and spread the concrete around.

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