Fabricated hollow floor system

Abstract

The utility model discloses an assembly type hollow floor system. The assembly type hollow floor system comprises a bottom plate, a supporting structure, a plurality of filling bodies and concrete. The supporting structure comprises a steel bar truss and upper-layer steel bars, the steel bar truss is fixed to the bottom plate, the steel bar truss and the bottom plate form a plurality of channels, and the upper-layer steel bars are fixed to the steel bar truss; the filling bodies are located in a channel formed by the steel bar truss and the bottom plate, the filling bodies are of hollow structures which are perpendicular to the height direction and have small-end-up cross sectional areas, and the upper-layer steel bars are attached to the upper surfaces of the filling bodies; and the concrete is filled in the supporting structure and around the filling body. The special structure of the filling body is combined with stable supporting, and the problems that the filling body is prone to floating upwards, and the cover body is prone to being punctured and sunken due to the fact that top concrete is too thin are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled building engineering, in particular to an assembled hollow floor slab. Background Art

[0002] Cast-in-place concrete hollow floor is a new type of floor system after beamless floor and ribbed floor. Its main technical feature is that it is a new type of hollow floor system formed by arranging a certain number of permanent thin-walled filling bodies in a regular manner in the cast-in-place concrete floor. It has light weight and large span, and can adapt to multi-story high-rise buildings with large bays and large spaces or large-span warehouses, basements and other buildings. The existing concrete hollow floor technology has problems such as the filling body floating and shifting during the casting process, uneven concrete pouring, and the filling body being easily punctured and sunken due to the excessive thinness of the concrete on the top of the filling body during the casting process. At the same time, the bottom plate cracks due to uneven concrete pouring or insufficient bearing capacity of the bottom plate during construction.

[0003] The existing Chinese patent with publication number CN102235048A discloses a reinforced concrete hollow floor slab, and its technical solution is: by cast-in-place dense ribs, prefabricated bottom plate and cast-in-place top plate, the hollow box is defined by the top plate, bottom plate and dense ribs. However, the cast-in-place dense ribs form beard ribs in the circumferential direction of the floor slab, which easily leads to an increase in the construction mold and the amount of concrete used. Secondly, the horizontal and longitudinal reinforcement makes the prefabricated floor slab wider, which is not suitable for some large-span buildings. The Chinese patent with announcement number CN113585578B discloses a prefabricated assembled prestressed composite floor slab and construction method, and its technical solution is: by configuring the prefabricated part of the honeycomb steel concrete beam and the prefabricated part of the steel concrete hollow hidden beam composite floor slab with steel and UHPC shell, the bearing capacity and bending strength of the floor slab are only increased, and the problem of floating and displacement of the hollow floor slab filling body during cement pouring, which leads to uneven pouring, etc., is still not solved. Utility Model Content

[0004] In view of the defects of the above existing technologies, the utility model provides a prefabricated hollow floor with good integrity, high structural rigidity, light weight, and suitable for large spaces and large net heights. The utility model adopts the following technical solutions:

[0005] An assembled hollow floor slab comprises:

[0006] Base plate;

[0007] A support structure, the support structure comprising a steel bar truss and upper steel bars, the steel bar truss is fixed to the bottom plate, the steel bar truss and the bottom plate form a plurality of channels, and the upper steel bars are fixed to the steel bar truss;

[0008] A plurality of filling bodies, wherein the filling bodies are located in the channel formed by the steel bar truss and the bottom plate, the filling bodies are hollow structures with a cross-sectional area perpendicular to the height direction that is small at the top and large at the bottom, and the upper steel bars are attached to the upper surface of the filling bodies;

[0009] Concrete is filled in the supporting structure and around the filling body.

[0010] Preferably, the filling body is one of the following shapes:

[0011] Hollow hemispherical structure;

[0012] or, a hollow spherical cap structure;

[0013] or, a hollow truncated cone structure;

[0014] The filling body comprises a hollow structure of a main body and a cover body, wherein the cover body is located above the main body, the main body is a hollow cylinder, and the cover body is a hollow hemispherical structure, a hollow spherical cap structure or a hollow truncated cone structure.

[0015] Preferably, the base plate is a prefabricated plate, and the material of the base plate is UHPC material.

[0016] Preferably, the supporting structure further comprises a lower layer of steel bars, which are arranged below the filling body and fixed on the steel bar truss, and the lower layer of steel bars cooperate with the upper layer of steel bars to constrain the filling body.

[0017] Preferably, the bottom plate is a rectangular prefabricated plate to which prestress is applied, and when the length-to-width ratio of the bottom plate is greater than or equal to 3:1, a plurality of stress-bearing steel bars are buried inside the bottom plate along the short side direction of the bottom plate;

[0018] When the length-to-width ratio of the base plate is less than 3:1, a plurality of stress-bearing steel bars are embedded inside the base plate along both the short side direction and the long side direction of the base plate.

[0019] Preferably, the stressed steel bars are grade 3 steel bars with a diameter of 6-10 mm.

[0020] Preferably, the steel bar truss comprises: an upper chord steel bar, a lower chord steel bar and a web steel bar, and the web steel bar, the upper chord steel bar and the lower chord steel bar form a triangular structure or a conical structure.

[0021] Preferably, there are multiple steel bar trusses, and the steel bar trusses are fixed to the base plate by welding.

[0022] Preferably, the filling bodies are arranged in sequence along the channel direction formed by the bottom plate and the steel bar trusses, gaps are provided between adjacent filling bodies, and the upper steel bars are attached to the upper surface of the filling bodies in a criss-cross manner.

[0023] Preferably, the filler body is made of hollow sealed waterproof materials such as recycled plastics.

[0024] Compared with the prior art, the beneficial effects of the present invention include at least:

[0025] 1. By setting the filling body to a special structure with a small top and a large bottom, the demand for the deadweight of the hollow floor slab is reduced without affecting the bending bearing capacity of the hollow floor slab. By fixing the filling body on a stable supporting structure, the problem of floating of the filling body caused by excessive buoyancy of cement during concrete filling is avoided.

[0026] 2. The filling cover has a small area, so when the concrete is filled into the cover, there will be no problem of too thin or uneven filling, which effectively reduces the problem of the cover being easily punctured or the cover being sunken due to external force.

[0027] 3. Furthermore, by combining the use of UHPC materials in the base plate with prestressing the base plate, the cracking load and durability of the base plate are improved, avoiding problems such as cracks and fissures in the base plate; by combining the use of UHPC materials in the base plate with ordinary concrete around the supporting structure and the filling body, the overall stiffness of the hollow floor slab is improved and the construction cost is saved. Therefore, the hollow floor slab is more suitable for large space and large net height buildings, and can replace the traditional floor slab, secondary beam, and main beam structure system, with the advantages of high cost performance and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the hollow floor slab of the embodiment of the utility model when the supporting structure is omitted.

[0029] Figure 2 It is a structural schematic diagram of a steel bar truss according to an embodiment of the utility model.

[0030] Figure 3A-3C It is a structural schematic diagram of the filling body of an embodiment of the utility model.

[0031] Figure 4A-4C It is a structural schematic diagram of the cover body of the filling body of the embodiment of the utility model.

[0032] In the figure: 1. base plate; 2. supporting structure; 21. steel truss; 22. upper chord steel bars; 23. web bar steel bars; 24. lower chord steel bars; 31. filling body; 32. cover body; 321. hollow hemispherical structure; 322. hollow spherical cap structure; 323. hollow truncated cone structure; 33. main body; 4. upper steel bars; 5. lower steel bars; 6. passage; 7. concrete. DETAILED DESCRIPTION

[0033] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0034] The words expressing positions and directions described in the present utility model are all explained by taking the drawings as examples, but they can be changed as needed, and all the changes are included in the protection scope of the present utility model.

[0035] like Figure 1 and Figure 2 As shown, the utility model provides an assembled hollow floor, which includes: a base plate 1, a supporting structure 2, a filling body 31 and concrete 7.

[0036] The bottom plate 1 is preferably a prefabricated plate made of UHPC (Ultra-High Performance Concrete) material, and the bottom plate 1 may be in a rectangular shape.

[0037] The supporting structure 2 includes a steel bar truss 21 and upper steel bars 4 . The steel bar truss 21 is fixed on the bottom plate 1 . The steel bar truss 21 and the bottom plate 1 form a plurality of channels 6 . The upper steel bars 4 are fixed on the steel bar truss 21 .

[0038] A plurality of filling bodies 31 are sequentially arranged in the channel 6 formed by the steel bar truss 21 and the bottom plate 1, and the filling body 31 is a hollow structure with a cross-sectional area perpendicular to the height direction that is small at the top and large at the bottom, and the upper steel bar 4 is attached to the upper surface of the filling body 31. It should be noted that the cross-sectional area of ​​the filling body 31 is a hollow structure with a small top and a large bottom, including but not limited to: from top to bottom, the cross-sectional area of ​​the filling body 31 increases step by step; from top to bottom, the filling body 31 is divided into multiple sections, and the cross-sectional area of ​​each section increases or increases step by step.

[0039] Concrete 7 is filled in the support structure 2 and around the filling body 31 .

[0040] The assembled hollow floor, on the one hand, reduces the need for the self-weight of the hollow floor without affecting the bending bearing capacity of the hollow floor by setting the filling body 31 as a special structure with a small top and a large bottom, and does not affect the bending bearing capacity of the hollow floor; by fixing the filling body 31 on a stable supporting structure 2, the problem of the filling body 31 floating due to excessive buoyancy of cement when filling with concrete 7 is avoided. In addition, because the top area of ​​the filling body 31 is small, the concrete 7 will not be filled too thinly or unevenly when filling the top, thereby effectively reducing the problem of the top of the filling body 31 being easily punctured or the top of the filling body 31 being squeezed and sunken due to external force. On the other hand, the cracking load and durability of the bottom plate 1 are further improved by combining the use of UHPC material in the bottom plate 1 with the application of prestress to the bottom plate 1, thereby avoiding problems such as cracks and fissures in the bottom plate 1. The use of UHPC material in the bottom plate 1 in combination with the support structure 2 and ordinary concrete 7 around the filling body 31 not only improves the overall stiffness of the hollow floor slab, but also saves construction costs. Therefore, the hollow floor slab is more suitable for use in buildings with large spaces and large net heights.

[0041] In one specific embodiment, the filling body 31 is in one of the following four shapes:

[0042] hollow hemispherical structure 321;

[0043] Hollow spherical cap structure 322;

[0044] Hollow truncated cone structure 323;

[0045] The hollow structure includes a body 33 and a cover 32 , wherein the cover 32 is located above the body 33 , and the cover 32 is a hollow spherical cap structure 322 , a hollow hemispherical structure 321 or a hollow truncated cone structure 323 , and the body 33 is a hollow cylinder.

[0046] The structure of the cover 32 being smaller than the main body 33 not only has the advantages of light weight reduction of the classic filling structure, but also has its own special structural advantages:

[0047] 1. The cover body 32 is a hollow spherical crown structure 322, a hollow hemispherical structure 321 and a hollow truncated cone structure 323, which are combined with the hollow round body structure of the main body 33 to conform to the calculation principle of the normal section bearing capacity of the T-section beam. Therefore, the hollow floor filling body 31 is used to save the amount of concrete 7 and reduce the weight of the hollow floor on the basis of ensuring the structural strength.

[0048] Second, due to the small area of ​​the cover 32, when the concrete 7 is filled around the filling body 31, the top of the cover 32 will not be too thin or uneven, and the cover 32 will not be easily punctured or damaged or squeezed by external force due to the concrete 7 on the top being too thin or uneven.

[0049] In a specific embodiment, the supporting structure 2 also includes a lower layer of steel bars 5, which are arranged below the filling body 31 and fixed on the steel truss 21. The lower layer of steel bars 5 and the steel truss 21 form a grid of the same size for placing the filling body 31. When the filling body 31 is placed on the grid, the upper layer of steel bars 4 and the steel truss 21 on the base plate 1 and the lower layer of steel bars 5 located on the base plate 1 limit the filling body 31 in a fixed space. At the same time, the web bars 23 of the steel truss 21 and the upper chord steel bars 22 and the lower chord steel bars 24 form a triangular structure or a conical structure, which cooperates with the upper layer of steel bars 4 attached to the cover body 32 to further constrain the filling body 31, thereby preventing the filling body 31 from floating or shifting during the concrete 7 filling process.

[0050] In a specific embodiment, a one-way slab or a two-way slab is selected as the base plate 1 according to different requirements of the building scene. The base plate 1 is, for example, rectangular. For example, in the construction of a house, a living room, a floor slab, a roof, etc., a one-way slab with a length-to-width ratio greater than or equal to 3:1 is generally selected as the base plate 1. Because the one-way slab is only stressed in the short side direction, during the process of applying prestress to the base plate 1, it is only necessary to bury multiple stress-bearing steel bars along the short side direction of the base plate 1, and there is no need to arrange stress-bearing steel bars in the long side direction within the plane of the base plate 1.

[0051] For building structures with larger spans, such as large shopping malls, conference halls, gymnasiums, etc., which require large load-bearing plates, the bottom plate 1 should be a two-way plate with an aspect ratio of less than 3:1 that can withstand loads in both directions. Because the two-way plate is subjected to forces in both directions, multiple stress-bearing steel bars need to be buried in the horizontal and vertical directions of the bottom plate 1 during the prestressing process of the bottom plate 1.

[0052] For the prestress applied during the production of the bottom plate 1 components, the prestressing construction method is preferred. Since the bottom plate 1 is a thin plate structure, the prestressed prefabricated plate produced by first tensioning the steel bars and then pouring the concrete components is more evenly stressed.

[0053] In a specific embodiment, the stress-bearing steel bars are preferably plain round steel bars of grade 3 steel with a diameter of 6-10 mm. The stress-bearing steel bars of this structure have a structural strength that is more compatible with the structure of the prefabricated hollow floor slab of the above structure.

[0054] In a specific embodiment, the steel bar truss 21 includes: an upper chord steel bar 22, a lower chord steel bar 24 and a web steel bar 23. The web steel bar 23, the upper chord steel bar 22 and the lower chord steel bar 24 form a triangular structure or a conical structure.

[0055] The steel truss 21 can be directly welded to the base plate 1 and fixed together with the upper steel bars 4 and the lower steel bars 5 on the base plate 1 to form a stable mesh structure, which increases the structural strength of the base plate 1 as a whole and ensures that the base plate 1 is not subject to or is free from structural deformation and mechanical safety problems during the processes of hoisting, transportation, and pouring of ordinary concrete 7 in the later stage. Compared with the conventional on-site cast hollow floor slab, the base plate 1 of this structure has the advantages of being support-free and formwork-free, eliminating the need for workers to set up support frames and formwork, reducing labor costs, and having the effect of reducing economic costs and improving efficiency.

[0056] In a specific implementation, there are multiple steel bar trusses 21 , and the steel bar trusses 21 are fixed to the base plate 1 by welding.

[0057] In a specific embodiment, the filling body 31 is made of a sealing and waterproof material, and the cover body 32 and the body 33 of the filling body 31 are fixed together by sealing and clamping.

[0058] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. An assembled hollow floor, characterized in that: include: Bottom plate (1); A support structure (2), the support structure (2) comprising a steel bar truss (21) and upper steel bars (4), the steel bar truss (21) being fixed on a bottom plate (1), the steel bar truss (21) and the bottom plate (1) forming a plurality of channels (6), and the upper steel bars (4) being fixed on the steel bar truss (21); A plurality of filling bodies (31), wherein the filling bodies (31) are located in a channel (6) formed by the steel bar truss (21) and the bottom plate (1), and the filling bodies (31) are hollow structures with a cross-sectional area perpendicular to the height direction being smaller at the top and larger at the bottom, and the upper steel bars (4) are attached to the upper surface of the filling bodies (31); Concrete (7), the concrete (7) is filled in the support structure (2) and around the filling body (31).

2. The assembled hollow floor according to claim 1, characterized in that: The filling body (31) is in one of the following shapes: Hollow hemispherical structure (321); or, a hollow spherical cap structure (322); or, a hollow truncated cone structure (323); The filling body (31) comprises a hollow structure of a main body (33) and a cover body (32), wherein the cover body (32) is located above the main body (33), the main body (33) is a hollow cylinder, and the cover body (32) is a hollow hemispherical structure (321), a hollow spherical cap structure (322) or a hollow truncated cone structure (323).

3. The assembled hollow floor according to claim 1, characterized in that: The base plate (1) is a prefabricated plate, and the material of the base plate (1) is UHPC material.

4. The assembled hollow floor according to claim 1, characterized in that: The support structure (2) further comprises a lower layer of steel bars (5), wherein the lower layer of steel bars (5) is arranged below the filling body (31) and fixed on the steel bar truss (21), and the lower layer of steel bars (5) cooperates with the upper layer of steel bars (4) to constrain the filling body (31).

5. The assembled hollow floor according to claim 1, characterized in that: The bottom plate (1) is a rectangular prefabricated plate to which prestress is applied; When the length-to-width ratio of the bottom plate (1) is greater than or equal to 3:1, a plurality of stress-bearing steel bars are buried inside the bottom plate (1) along the short side direction of the bottom plate (1); When the length-to-width ratio of the bottom plate (1) is less than 3:1, a plurality of stress-bearing steel bars are embedded inside the bottom plate (1) along both the short side direction and the long side direction of the bottom plate (1).

6. The assembled hollow floor according to claim 5, characterized in that: The stress-bearing steel bars are grade 3 steel bars with a diameter of 6-10 mm.

7. The assembled hollow floor according to claim 1, characterized in that: The steel bar truss (21) comprises: an upper chord steel bar (22), a lower chord steel bar (24) and a web steel bar (23); the web steel bar (23) forms a triangular structure or a conical structure with the upper chord steel bar (22) and the lower chord steel bar (24).

8. The assembled hollow floor according to claim 7, characterized in that: The number of the steel trusses (21) is plural, and the steel trusses (21) are placed before the bottom plate UHPC solidifies and is fixed on the bottom plate (1) by utilizing the bonding and anchoring force of the UHPC.

9. The assembled hollow floor according to claim 1, characterized in that: The filling bodies (31) are arranged in sequence along the direction of the channel (6) formed by the bottom plate (1) and the steel bar truss (21), gaps are provided between adjacent filling bodies (31), and the upper steel bars (4) are attached to the upper surface of the filling bodies (31) in a crisscross manner.

10. The assembled hollow floor according to claim 1, characterized in that: The filling body (31) is made of hollow waterproof material.

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