Saving type cement-based combined floor support plate

Abstract

The invention relates to the technical field of fabricated buildings, and discloses a saving type cement-based combined floor support plate which comprises a cement-based bottom plate, a base assembly, a combined screw and a steel pipe, the base assembly comprises a connecting rod, a bottom steel bar set fixed to the lower end of the connecting rod and a top steel bar set fixed to the upper end of the connecting rod, and the bottom steel bar set and the top steel bar set are connected through a steel pipe. The bottom steel bar group is pre-buried in the cement-based bottom plate, concrete is cast in place between the bottom steel bar group and the top steel bar group, the top steel bar group is flush with the finished surface of the structural floor, and a threaded hole is formed in the upper end part of the connecting rod; the lower end of the combined screw is in threaded fit with the threaded hole, and a fixing nut and a movable nut located above the fixing nut are arranged on the combined screw. According to the saving type cement-based combined floor support plate, the usage amount of concrete and steel bars is saved, production, transportation and installation are more convenient, connection is reliable, the floor thickness is convenient to control, and structural safety calculation indexes are not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and particularly to a saving type cement-based composite floor slab. Background Art

[0002] In the floor structure system of existing concrete prefabricated buildings, the commonly used floor slab form is the composite method of a 60-mm precast composite floor slab plus a cast-in-place layer of not less than 60 mm. This method has the following several significant problems:

[0003] 1) Increase in the amount of concrete used: The minimum slab thickness of a two-way slab floor required for a cast-in-place concrete structure is 80 mm, and the conventional engineering practice is about 100 mm. However, when using a precast composite floor slab, the minimum thickness required by the specification is 60 mm precast plus 60 mm cast-in-place. And due to the reason of laying pipelines on site, the composite floor slab method often needs to be more than 130 mm. Due to the increase in the self-weight of the slab thickness, the sizes of structural walls, columns, and foundations need to be increased accordingly during structural calculation to meet the bearing capacity requirements after the increase in the self-weight load of the slab thickness.

[0004] 2) Increase in the amount of steel used: To solve the hoisting problem of the composite slab, additional truss steel bars need to be added to increase the stiffness of the composite slab and serve as hoisting points, which greatly increases the amount of steel bars in the precast component itself. Due to the increase in the self-weight of the slab thickness, when calculating the structural bearing capacity, it not only increases the amount of steel bars in the floor slab itself but also requires additional steel bars in beams, walls, columns, and foundations.

[0005] 3) Difficulties in production, transportation, and installation: During production, the composite slab needs to be deepened and designed for the detailed drawings of precast components according to the drawings of various specialties such as architecture, structure, water supply, heating, and electricity before cutting and processing. And the production molds need to be set separately according to different plates and cannot be reused. The direct spacing of the steel bars laid on each plate needs to be designed separately according to different drawings, with low efficiency; during transportation, the stiffness of the composite slab itself is not large, and it is easy to deform and crack during transportation; during installation, the composite slab has a large thickness, and the weight is basically more than 1 ton, making the hoisting operation difficult, increasing the tower crane cost. And the side of the composite slab needs to extend steel bars into the beam support, resulting in difficult steel bar binding of the surrounding structural beams. In addition, 60 mm of the lower part of the composite slab is precast, and when laying mechanical and electrical pipelines on site, the pipes can only be routed in the upper cast-in-place layer, with limited space, and pipeline intersections often occur on site, making pipeline laying very difficult.

[0006] 4) Unreliable connection form: Due to production and transportation problems, when the size of the structural floor slab is large, it needs to be split into two or more pieces and assembled into a whole on site. The lap connection of the steel bars in the post-cast section between the precast composite slabs is unreliable. The lap joint area of the bottom steel bars of the structural floor slab is 100% within the same connection section, forming a weak position. Cracks are also very likely to occur at the post-cast section. Another method of closely joined composite slabs is even more prone to crack problems. In addition, when using traditional composite floor slabs, the shear resistance between the precast slab and the cast-in-place concrete layer mainly relies on the rough surface of the composite slab surface and the web bars of the truss. During production by the manufacturer, the rough surface of the composite slab is often made by brushing with a broom, and the effect is very poor. The truss bars also have limited effect due to their too small diameter. Therefore, the connection effect of the joint surface of the composite slab is not ideal.

[0007] 5) Difficult to control the thickness of the cast-in-place concrete: Due to the production error of the thickness of the precast layer under the composite slab and the rough surface of the composite slab, it is impossible to use the traditional thickness controller for the cast-in-place floor slab. When pouring the cast-in-place layer of the composite slab on site, the situation of over-pouring often occurs.

[0008] 6) Adverse to the structural safety calculation index: The problem of the increase in the self-weight load of the structural floor slab caused by the increase in the slab thickness will have an adverse impact on some structural safety indexes. Summary of the Invention

[0009] The purpose of the present invention is to provide a saving type cement-based composite floor formwork to solve the deficiencies of traditional composite slabs, so as to achieve the purposes of saving materials, facilitating production, transportation and construction, and strengthening the connection effect.

[0010] To achieve the above purpose, the present invention adopts the following technical solutions:

[0011] A saving type cement-based composite floor formwork includes a cement-based bottom plate, a base assembly, a combined screw and a steel pipe, wherein:

[0012] The cement-based bottom plate is a precast part and serves as the bottom protective layer of the structural floor slab;

[0013] A number of base assemblies are distributed in an array on the cement-based bottom plate. The base assembly includes a connecting rod, a bottom steel bar group fixed to the lower end of the connecting rod, and a top steel bar group fixed to the upper end of the connecting rod. The bottom steel bar group is embedded in the cement-based bottom plate. Concrete is poured on site between the bottom steel bar group and the top steel bar group. The top steel bar group is flush with the finished surface of the structural floor slab. A threaded hole is provided at the upper end of the connecting rod;

[0014] A number of combined screws are arranged in one-to-one correspondence with each base assembly. The lower end of the combined screw is in threaded fit with the threaded hole. A fixed nut and a movable nut located above the fixed nut are provided on the combined screw;

[0015] Steel pipes are passed through the combined screw rods in the same row and / or the same column. The steel pipes are supported by fixed nuts and locked by movable nuts.

[0016] As an optional solution, a concrete anchoring pier is provided on the cement base plate corresponding to each base assembly, and the concrete anchoring pier is used to fix the connecting rod.

[0017] As an optional solution, the diameter of the concrete anchor pier is 80 mm and the height is 60 mm to 65 mm.

[0018] As an optional solution, the bottom steel bar group includes a plurality of first radial ribs welded to the lower end of the connecting rod and evenly distributed around the circumference, and a first circular steel bar is welded to the outer end of each first radial rib; the top steel bar group includes a plurality of second radial ribs welded to the upper end of the connecting rod and evenly distributed around the circumference, and a second circular steel bar is welded to the outer end of each second radial rib.

[0019] As an optional solution, the first radial ribs, the second radial ribs, the first circular steel bars, and the second circular steel bars all use steel bars with a diameter of 4 mm, the diameter of the connecting rod is 20 mm, the diameter of the first circular steel bars is 300 mm, and the diameter of the second circular steel bars is 200 mm.

[0020] As an optional solution, the cement base board has a thickness of 15 mm to 20 mm, high-strength steel wires arranged vertically and horizontally are embedded in the cement base board, and a gravel layer is provided on the surface of the cement base board to increase the surface roughness of the cement base board.

[0021] As an option, the diameter of the high-strength steel wire is 2mm and the bidirectional spacing is 300mm.

[0022] As an optional solution, the gravel layer is formed by high-pressure spraying of gravel with a particle size of 5 mm on the concrete surface of the cement-based slab.

[0023] As an optional solution, the combined screw rods and steel pipes are reusable parts that can be removed after the strength of the structural floor reaches the required level.

[0024] Beneficial effects of the present invention:

[0025] The economical cement-based composite floor deck has the following advantages:

[0026] 1) Concrete saving: The prefabricated cement base plate is used as the bottom protective layer of the structural floor. The floor steel bars and equipment pipelines are laid on site, and the remaining thickness of the structural floor concrete is poured. There is no need to thicken the structural floor due to difficulties in laying pipelines, nor is there any need to increase the amount of concrete used in the structural wall columns or foundations;

[0027] 2) Steel bar saving: Bidirectional assembled and disassembled steel pipes are adopted on the upper part of the cement-based floor slab to increase the overall stiffness and serve as lifting tools. There is no need to increase the truss steel bars, and the steel pipe components can be disassembled and recycled later. It will not cause the self-weight load to increase due to the increase in the floor slab thickness, nor will it cause the increase in the steel bar quantity of the structural beams, slabs, wall columns and foundations.

[0028] 3) Convenient production, transportation and installation: During production, the cement-based floor slab only needs to be processed according to the size of the floor slab splitting plan. Since the high-strength steel wires inside are of standard diameter and spacing, there is no need for detailed shop drawings, and the high-strength steel wires do not extend out of the slab section. The production molds are all standard-sized angle steels without the need for drilling, and the molds can also be reused. During transportation, due to the existence of combined screws and steel pipes, the cement-based composite floor formwork has high stiffness and is not prone to deformation and cracking. During installation, since the uncast cement-based composite floor formwork is light in weight, it is easy to hoist, and an ordinary tower crane can meet the hoisting requirements. There is no steel bar extending into the support in the on-site cement-based composite floor formwork, which does not affect the binding of the steel bars of the surrounding beams. The space for laying on-site pipelines is the same as that for cast-in-place floor slabs, and there is no problem of difficult laying. In addition, the top steel bar group of the base assembly in the cement-based floor slab can be used as a slab thickness controller, which is convenient for controlling the on-site concrete pouring construction.

[0029] 4) Reliable connection: The cement-based floor slab only serves as the protective layer part under the structural floor slab. The upper steel bars are all laid continuously on-site and are cast into a whole with the cast-in-place concrete, showing a mechanical mode of integral force. In addition, the concrete anchor piers on the cement-based floor slab are used for shear resistance at the joint surface, and the base assembly is used to tie the cast-in-place concrete layer and the bottom plate of the cement-based floor formwork. Moreover, the surface of the cement-based floor slab adopts the process of high-pressure spraying of stones to enhance the rough surface effect, making the structural reliability of the cement-based composite floor formwork completely equivalent to that of the cast-in-place structure.

[0030] 5) Facilitating the control of the floor slab thickness: The height of the pre-embedded base assembly is set according to the total thickness of the structural floor slab, and the elevation of the upper surface of the base assembly is the top elevation of the completed surface of the cast-in-place part of the structural floor slab.

[0031] 6) Not affecting the structural safety calculation index: Using the cement-based composite floor formwork does not require an additional increase in the floor slab thickness. It has the same performance as the traditional integral cast-in-place floor slab and will not have an adverse impact on the structural safety calculation index due to reasons such as thickening the floor slab or integrity. Brief Description of the Drawings

[0032] Figure 1 is the plan view of the energy-saving cement-based composite floor formwork provided by the embodiment of the present invention;

[0033] Figure 2 is the sectional view of the energy-saving cement-based composite floor formwork provided by the embodiment of the present invention;

[0034] Figure 3 is Figure 2 The enlarged view of area A in the middle;

[0035] Figure 4 It is a schematic structural view of the base assembly in the energy-saving cement-based composite floor formwork provided by an embodiment of the present invention.

[0036] In the drawings:

[0037] 1. Cement-based bottom plate; 11. Concrete anchoring pier; 12. High-strength steel wire;

[0038] 2. Base assembly; 21. Connecting rod; 211. Threaded hole; 22. Bottom steel bar group; 221. First radial bar; 222. First circular bar; 23. Top steel bar group; 231. Second radial bar; 232. Second circular bar;

[0039] 3. Composite screw; 31. Fixed nut; 32. Movable nut;

[0040] 4. Steel pipe. Detailed implementation manners

[0041] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0042] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between 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.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above and to the right", and "on the top" of the second feature includes the first feature being directly above and diagonally above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below and to the left", and "under the bottom" of the second feature includes the first feature being directly below and diagonally below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0044] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "left", "right", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of description and simplifying the operations, rather than indicating or implying that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0045] In addition, terms such as "first", "second", etc. are only used for distinction in description and have no special meanings.

[0046] Please refer to Figures 1 to 4 As shown, this embodiment provides a saving type cement-based composite floor formwork, which includes a cement-based bottom plate 1, a base assembly 2, a composite screw 3 and a steel pipe 4, wherein:

[0047] The cement-based bottom plate 1 is a precast member and serves as the bottom protection layer of the structural floor slab.

[0048] A number of base assemblies 2 are arrayed on the cement-based bottom plate 1. The base assembly 2 includes a connecting rod 21, a bottom steel bar group 22 fixed to the lower end of the connecting rod 21, and a top steel bar group 23 fixed to the upper end of the connecting rod 21. The bottom steel bar group 22 is embedded in the cement-based bottom plate 1. Concrete is cast in situ between the bottom steel bar group 22 and the top steel bar group 23. The top steel bar group 23 is flush with the finished surface of the structural floor slab. A threaded hole 211 is provided at the upper end of the connecting rod 21.

[0049] A number of composite screws 3 are arranged in one-to-one correspondence with each base assembly 2. The lower end of the composite screw 3 is in threaded fit with the threaded hole 211. A fixing nut 31 and a movable nut 32 located above the fixing nut 31 are provided on the composite screw 3.

[0050] A steel pipe 4 is penetrated through the composite screws 3 in the same row and / or the same column. The steel pipe 4 is supported by the fixing nut 31 and locked by the movable nut 32.

[0051] Thereby, the usage amounts of concrete and steel bars are saved, production, transportation and installation are more convenient, the connection is reliable, it is convenient to control the thickness of the floor slab, and it does not affect the structural safety calculation indexes.

[0052] Optionally, a concrete anchoring pier 11 is provided on the cement-based bottom plate 1 corresponding to each base assembly 2. The concrete anchoring pier 11 is used to fix the connecting rod 21.

[0053] Thereby, the concrete anchoring pier 11 enhances the structural stability of the base assembly 2, ensures that all components are firmly combined during construction and use, and further facilitates determining the thickness of the subsequent cast-in-place concrete.

[0054] Specifically, the diameter of the concrete anchoring pier 11 is 80 mm, and the height is 60 mm to 65 mm. Moreover, the position of the concrete anchoring pier 11 is aligned with the center of the connecting rod 21 to ensure the best anchoring effect.

[0055] Optionally, for details, see Figure 4 , the bottom steel bar group 22 includes several first radial steel bars 221 that are welded to the lower end of the connecting rod 21 and evenly distributed in a circumferential manner. The outer ends of the respective first radial steel bars 221 are welded with a first circular steel bar 222; the top steel bar group 23 includes several second radial steel bars 231 that are welded to the upper end of the connecting rod 21 and evenly distributed in a circumferential manner. The outer ends of the respective second radial steel bars 231 are welded with a second circular steel bar 232.

[0056] Thus, the first radial steel bars 221 and the first circular steel bar 222 form a stable bottom support, playing a role in anti-pulling and anchoring; the second radial steel bars 231 and the second circular steel bar 232 form a stable top structure, which is used to control the thickness of the cast-in-place slab and cooperate with the bottom steel bar group 22 to strengthen the integrity of the cement-based floor slab 1 and the cast-in-place slab.

[0057] Specifically, the first radial steel bars 221, the second radial steel bars 231, the first circular steel bar 222, and the second circular steel bar 232 are all made of steel bars with a diameter of 4 mm. The diameter of the connecting rod 21 is 20 mm, the diameter of the first circular steel bar 222 is 300 mm, and the diameter of the second circular steel bar 232 is 200 mm. Each steel bar adopts a conventional size, which is convenient for processing and procurement and reduces costs.

[0058] Optionally, the thickness of the cement-based floor slab 1 is 15 mm to 20 mm. High-strength steel wires 12 arranged longitudinally and horizontally are embedded in the cement-based floor slab 1. A stone layer is provided on the surface of the cement-based floor slab 1. The stone layer is used to increase the surface roughness of the cement-based floor slab 1 so that the subsequently cast-in-place concrete can be reliably combined with the cement-based floor slab 1. In addition, the four-side molds of the cement-based floor slab 1 can be made of ordinary angle steel of L20X3 specification.

[0059] Specifically, the diameter of the high-strength steel wires 12 is 2 mm, and the two-way spacing is 300 mm.

[0060] Specifically, the stone layer is formed by high-pressure spraying of stones with a particle size of 5 mm on the concrete surface of the cement-based floor slab 1.

[0061] Optionally, the combined screw 3 and the steel pipe 4 are reusable parts and can be removed after the strength of the structural floor slab meets the requirements.

[0062] Installation process:

[0063] ①Prefabricated cement-based floor slab 1, with high-strength steel wires 12 and base assembly 2 embedded. After the concrete is compacted by pouring, stones are sprayed on the surface of the cement-based floor slab 1 under high pressure; ②Install combined screw 3 on the upper part of the base assembly 2. The lower end of the combined screw 3 can be screwed into the threaded hole 211 at the upper end of the base assembly 2 through threads; ③Install steel pipe 4 between fixed nut 31 and movable nut 32 fixed on the combined screw 3; ④On-site tool-type supports are used for the cement-based composite floor formwork, and support points are set at the four corners, eliminating the need for full hall scaffolding support; ⑤The cement-based floor slab 1 only serves as the bottom protection layer of the later structural floor slab. Reinforcement bars and mechanical and electrical pipelines are all laid on-site above the cement-based floor slab 1, without affecting the construction of surrounding beam slabs and without increasing the thickness of the structural floor slab; ⑥On-site, the base assembly 2 is used to accurately control the thickness of the cast-in-place concrete. After the strength of the structural floor slab reaches the requirement, the combined screw 3 and steel pipe 4 can be removed and recycled.

[0064] In summary, the energy-saving cement-based composite floor formwork has the following advantages:

[0065] 1) Save concrete: The 15mm - 20mm thick cement-based floor slab 1 with high-strength steel wires 12 embedded in high-strength concrete serves as the bottom protection layer of the structural floor slab. Floor slab reinforcement bars and equipment pipelines are laid on-site, and the remaining thickness of the structural floor slab concrete is poured. There is no need to thicken the structural floor slab additionally due to problems such as difficult pipeline laying, nor is it necessary to increase the concrete consumption of structural walls, columns, or foundations;

[0066] 2) Save steel bars: Bidirectional assembled and disassembled steel pipes 4 are used on the upper part of the cement-based floor slab 1 to increase the overall stiffness and serve as lifting tools. There is no need to increase truss reinforcement bars, and the steel pipes 4 can also be disassembled and recycled later. It will not cause an increase in the self-weight load due to the increase in the floor slab thickness, nor will it cause an increase in the amount of steel bars in structural beams, slabs, walls, columns, and foundations;

[0067] 3) Convenient production, transportation, and installation: During production, the cement-based floor slab 1 only needs to be processed according to the floor slab splitting plan dimensions. Since the embedded high-strength steel wires 12 are all of standard diameter and spacing, no detailed detailed drawings are required, and the high-strength steel wires 12 do not protrude from the slab cross-section. The production molds are all standard-sized angle steels, without the need for punching, and the molds can also be reused; During transportation, due to the presence of the combined screw 3 and steel pipe 4, the cement-based composite floor formwork has high stiffness and is not prone to deformation and cracking; During installation, since the uncast cement-based composite floor formwork is light in weight, it is convenient to lift, and an ordinary tower crane can meet the lifting requirements; There are no steel bars extending into the supports in the on-site cement-based composite floor formwork, which does not affect the binding of surrounding beam steel bars; The on-site pipeline laying space is the same as that of the cast-in-place floor slab, and there is no problem of difficult laying; In addition, the top steel bar group 23 of the base assembly 2 in the cement-based floor slab 1 can be used as a slab thickness controller, facilitating the control of on-site concrete pouring construction;

[0068] 4) Reliable connection: The cement-based floor slab 1 only serves as the protective layer part under the structural floor slab. The upper steel bars are all laid continuously on-site and are cast integrally with the cast-in-place concrete, presenting a mechanical mode of integral stress. Additionally, the concrete anchor piers 11 with a diameter of 80 mm on the cement-based floor slab 1 are used for shear resistance at the joint surface, and the base assembly 2 is used to tie the cast-in-place concrete layer and the bottom plate of the cement-based floor deck. Moreover, the surface of the cement-based floor slab 1 adopts the process of high-pressure spraying of gravel to enhance the rough surface effect, making the structural reliability of this cement-based composite floor deck completely equivalent to that of the cast-in-place structure;

[0069] 5) Facilitate the control of the floor slab thickness: The height of the pre-embedded base assembly 2 is set according to the total thickness of the structural floor slab. The elevation of the upper surface of the base assembly 2 is the top elevation of the completed surface of the cast-in-place part of the structural floor slab. For example, when casting concrete on-site, the base assembly 2 with a spacing of 1.2 m between the top steel bar group 23 and the bottom steel bar group 22 is used to cast concrete, which can accurately control the floor slab thickness to be approximately 1.2 m;

[0070] 6) Do not affect the structural safety calculation index: Using the cement-based composite floor deck does not require an additional increase in the floor slab thickness. It has the same performance as the traditional integral cast-in-place floor slab and will not have an adverse impact on the structural safety calculation index due to reasons such as thickening the floor slab or integrity.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A type of energy-saving cement-based composite floor deck, characterized in that, It includes a cement-based floor slab (1), a base assembly (2), a combined screw (3), and a steel pipe (4), where: The cement-based floor slab (1) is a prefabricated component and serves as the bottom protective layer of the structural floor slab. A number of the base assemblies (2) are arrayed and distributed on the cement-based floor slab (1). The base assembly (2) includes a connecting rod (21), a bottom steel bar group (22) fixed to the lower end of the connecting rod (21), and a top steel bar group (23) fixed to the upper end of the connecting rod (21). The bottom steel bar group (22) is embedded in the cement-based floor slab (1). Concrete is cast in place between the bottom steel bar group (22) and the top steel bar group (23). The top steel bar group (23) is flush with the finished surface of the structural floor slab. A threaded hole (211) is provided at the upper end of the connecting rod (21). A number of the combined screws (3) are arranged in one-to-one correspondence with each of the base assemblies (2). The lower end of the combined screw (3) is in threaded fit with the threaded hole (211). A fixing nut (31) and a movable nut (32) located above the fixing nut (31) are provided on the combined screw (3). The steel pipe (4) is threaded through the combined screws (3) in the same row and / or the same column. The steel pipe (4) is supported by the fixing nut (31) and locked by the movable nut (32).

2. The energy-saving cement-based composite floor formwork according to claim 1, wherein Concrete anchor piers (11) are provided on the cement-based floor slab (1) corresponding to each of the base assemblies (2). The concrete anchor piers (11) are used to fix the connecting rod (21).

3. The energy-saving cement-based composite floor slab according to claim 2, characterized in that The diameter of the concrete anchor pier (11) is 80 mm, and the height is 60 mm to 65 mm.

4. The energy-saving cement-based composite floor formwork according to claim 1, characterized in that The bottom steel bar group (22) includes a number of first radial bars (221) welded to the lower end of the connecting rod (21) and circumferentially distributed. The outer ends of each of the first radial bars (221) are welded with a first circular ring steel bar (222). The top steel bar group (23) includes a number of second radial bars (231) welded to the upper end of the connecting rod (21) and circumferentially distributed. The outer ends of each of the second radial bars (231) are welded with a second circular ring steel bar (232).

5. The energy-saving cement-based composite floor formwork according to claim 4, wherein, The first radial bar (221), the second radial bar (231), the first circular ring steel bar (222), and the second circular ring steel bar (232) are all made of steel bars with a diameter of 4 mm. The diameter of the connecting rod (21) is 20 mm. The diameter of the first circular ring steel bar (222) is 300 mm. The diameter of the second circular ring steel bar (232) is 200 mm.

6. The energy-saving cement-based composite floor formwork according to claim 1, wherein, The thickness of the cement-based floor slab (1) is 15 mm to 20 mm. High-strength steel wires (12) arranged longitudinally and transversely are embedded in the cement-based floor slab (1). A gravel layer is provided on the surface of the cement-based floor slab (1). The gravel layer is used to increase the surface roughness of the cement-based floor slab (1).

7. The energy-saving cement-based composite floor slab according to claim 6, wherein, The diameter of the high-strength steel wire (12) is 2 mm, and the two-way spacing is 300 mm.

8. The energy-saving cement-based composite floor slab according to claim 6, characterized in that, The gravel layer is formed by high-pressure spraying of gravel with a particle size of 5 mm on the concrete surface of the cement-based floor slab (1).

9. The energy-saving cement-based composite floor slab according to claim 1, wherein, The combined screw rod (3) and the steel pipe (4) are reusable components and can be removed after the strength of the structural floor slab meets the requirements.

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