Disassembly-free bottom die combined prefabricated laminated floor support plate

Abstract

The embodiment of the utility model relates to a disassembly-free bottom die combined prefabricated laminated floor support plate which comprises a composite bottom plate which is of a composite structure composed of a thin steel plate provided with a buckling groove in the main stress direction and an ultra-high performance fiber concrete (UHPC) plate prefabricated on the thin steel plate. The trusses are parallel to one another and welded to the thin steel plate at intervals according to the design requirement. According to the embodiment, the truss is welded to the steel plate firstly, then the truss serves as the bottom die to pour the ultra-high-performance fiber concrete with the preset thickness, and on one hand, the problem of pouring slurry leakage caused by the method that holes are formed in the concrete plate in advance or welding is conducted to fix the truss can be avoided; on the other hand, the main stress direction of the steel plate is made into a buckling groove shape, the steel plate is mutually meshed and tightly buckled on the beam, the steel plate can serve as a disassembly-free bottom die of the post-cast strip, the truss welded to the steel plate and the prefabricated concrete can enhance the bending rigidity of the steel plate, warping and deformation of the plate end during cast-in-place of the concrete are avoided, and the slurry leakage problem of the spliced post-cast strip is essentially avoided; and secondly, the disassembly-free bottom die combined prefabricated laminated floor support plate with the steel plate and the ultra-high-performance fiber concrete as main stress components in the plate bottom tension area is high in crack resistance, and cracks are not prone to being generated in the transportation and construction process.

Description

TECHNICAL FIELD

[0001] The utility model discloses floor support plate technical field for building, especially relates to a kind of free dismantling bottom mould truss floor support plate. BACKGROUND

[0002] With the wide application of steel structure, the construction method of traditional cast-in-place slab needs to set up formwork and scaffold, and the huge engineering quantity caused by site binding steel bar is difficult to keep up with the construction speed of building main body using steel structure, thereby affecting the overall progress of project. To overcome the above construction shortcomings, engineers have developed various permanent formworks, including ordinary prefabricated composite slab, composite floor and free dismantling bottom mould truss floor support plate. However, the above three formworks have their own defects in the prior art: (1) ordinary prefabricated composite slab is prone to cracks under the action of dynamic effect in the moment of demolding lifting and adsorption force between mold and slab surface due to its large self-weight and poor crack resistance. It is also prone to shrinkage cracks during factory storage and natural curing due to the limitation of curing conditions. (2) The composite floor works together with the upper and lower chord steel bars and the profiled steel plate is made of thin steel plate. The thickness of the plate is generally configured according to the stress in the use stage, and the deflection and deformation in the construction stage are rarely considered. In addition, the plate bottom needs to be treated for fireproofing. When applied to concrete structure, the warping and deformation of the plate end cannot be avoided due to the limitation of the structure of the composite floor, and the leakage problem is almost unsolvable. (3) The steel bar truss of the existing free dismantling bottom mould truss floor support plate is fixed on the prefabricated plate by connecting components. Whether a series of prefabricated holes are provided on the bottom plate of the prefabricated plate [CN 216616476 U] or self-tapping screws are used to fix the plate ribs of the bottom plate [CN 215442615 U] and a series of derived ways, all of which need to drill holes on the plate. In addition to causing cracks in the production, transportation and construction process of the plate, the bottom plate is also in tension state in the long-term use process, which can also cause the development of cracks at the connection and the leakage phenomenon during pouring.

[0003] Therefore, it is necessary to improve one or more problems existing in the above related technical solutions.

[0004] It should be noted that this part aims to provide background or context for the technical solutions of the disclosure stated in the claims. The description herein is not admitted as prior art because it is included in this part. UTILITY MODEL CONTENT

[0005] The purpose of the embodiment of the disclosure is to provide a free dismantling bottom mould truss composite prefabricated composite floor support plate, thereby overcoming one or more problems caused by the limitations and defects of the related art to at least some extent.

[0006] The disclosure provides a disassembly-free bottom mold combined prefabricated composite floor support plate.

[0007] The composite bottom plate comprises a thin steel plate as a bottom mold and a preset thickness of ultra-high performance concrete (UHPC) poured thereon;

[0008] A plurality of steel bar trusses are welded on the thin steel plate, and the thin steel plate is also a lining plate for pouring the high-strength fiber concrete bottom plate.

[0009] The UHPC base material of the ultra-high performance fiber concrete plate can adopt three strength grades of 120 MPa, 150 MPa and 160 MPa, the steel fiber of the ultra-high performance fiber concrete plate can adopt three types of long fiber, short fiber and micro fiber, and the mixing amount of the steel fiber can adopt 1.5%, 2.0% and 2.5%. Preferably, the ultra-high performance fiber concrete plate adopts 2.5% long fiber mixed in the UHPC base material with a strength grade of 120 MPa.

[0010] A plurality of steel bar trusses are welded on the thin steel plate, and the thin steel plate is also a lining plate for pouring the high-strength fiber concrete bottom plate.

[0011] In the disclosure, each steel bar truss comprises a top chord steel bar or a top chord steel pipe or a top chord steel plate, a bottom chord steel bar and a web connecting structure.

[0012] The top chord steel bar or the top chord steel pipe or the top chord steel plate is located at the top of the truss.

[0013] The two bottom chords are located at the two sides of the bottom of the truss, respectively, the top chord is parallel to each side of the bottom chord, and the top chord and each side of the bottom chord are connected by a web, respectively.

[0014] The web is in a wave shape or a shape of Λ (cross section), the wave peak and the wave valley of the wave-shaped web are welded with the top chord and the same side bottom chord, respectively, the sharp angle of the inverted sharp angle-shaped web is welded with the top chord, and the two sides of the bottom of the inverted sharp angle-shaped web are welded with the two bottom chords, respectively.

[0015] In an embodiment of the disclosure, when the composite bottom plate is supported on an I-shaped steel beam, adjacent bottom steel plates are extended in a buckle groove shape along the plate edge, so that adjacent floor support plates can be tightly engaged with each other by the buckle groove, thereby avoiding the problem of slurry leakage during pouring of the post-poured belt.

[0016] In an embodiment of the disclosure, the steel plates engaged with each other on the beam, the left side steel plate first extends the concrete bottom plate horizontally to the right, then bends upward, then bends to the right, and finally bends downward; the right side steel plate first extends the concrete bottom plate horizontally to the left, then bends upward, then bends to the left, and finally bends downward.

[0017] In an embodiment of the present disclosure, the buckle grooves of the mutually engaged steel plates are in a "П" shape after overlapping, so as to ensure seamless jointing.

[0018] In an embodiment of the present disclosure, the thickness of the prefabricated concrete of the bottom plate is determined according to the height of the tensile zone of the plate, and can be 15mm-20mm.

[0019] In an embodiment of the present disclosure, the thickness of the thin steel plate of the bottom plate is 0.5mm.

[0020] In an embodiment of the present disclosure, the diameter of the upper and lower chord steel bars of the truss is 6mm-12mm, the diameter of the steel pipe of the upper chord is 25mm-30mm, the width of the steel plate of the upper chord is 75mm-85mm, and the diameter of the web steel bar is 4.5mm-5.5mm.

[0021] In an embodiment of the present disclosure, the preset distance of the truss is 150mm-400mm.

[0022] The technical scheme provided by the embodiment of the present disclosure can include the following beneficial effects:

[0023] The dismounting bottom mold combined prefabricated composite plate in the embodiment of the present disclosure is welded with a steel bar truss on a steel plate, and then super high performance fiber concrete is poured thereon, so that the truss is firmly fixed on the bottom mold. (1) The dismounting bottom mold combined prefabricated composite floor support plate with the steel plate and the super high performance fiber concrete as the main force bearing members in the tensile zone of the plate bottom has strong crack resistance and is not prone to cracks during transportation and construction; (2) the steel plate can be used as a bottom mold for pouring concrete during prefabrication in a factory, thereby reducing or omitting the formwork and support, accelerating the process, and saving construction time and labor cost; (3) the problem of fixing the truss steel bar on the prefabricated plate is solved, the problem of pouring leakage caused by pre-holes or welding on the bottom mold is avoided, the engineering quality is improved, and the construction progress is accelerated; (4) the gripping force of the prefabricated concrete bottom plate and the steel bar truss is improved, thereby improving the ability to resist the steel plate falling off caused by insufficient shear resistance after pouring concrete on site; (5) the adjacent steel plates on the beam are made into buckle groove shapes to engage tightly, so as to serve as the dismounting bottom mold for pouring concrete later, and the truss welded on the steel plate and the poured concrete during prefabrication can enhance the bending stiffness of the steel plate, avoid warping and deformation of the plate end, and essentially avoid the problem of pouring leakage of the post-pouring belt. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings herein are incorporated into the description and form part of the description, show embodiments consistent with the present disclosure, and together with the description serve to explain the principles of the embodiments of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0025] Figure 1 and Figure 2 respectively show the free-standing formwork combined prefabricated composite floor slab three-dimensional structure schematic diagram of the wave-shaped web and the inverted sharp-angle-shaped web connection mode in the embodiment of the present disclosure;

[0026] Figure 3 and Figure 4 respectively show the steel truss structure schematic diagram of the wave-shaped web and the inverted sharp-angle-shaped web in the embodiment of the present disclosure;

[0027] Figure 5 and Figure 6 respectively show the free-standing formwork combined prefabricated composite floor slab top view structure schematic diagram of the wave-shaped web and the inverted sharp-angle-shaped web connection mode in the embodiment of the present disclosure;

[0028] Figure 7 show the free-standing formwork combined prefabricated composite floor slab 1-1 cross-sectional structure schematic diagram in the embodiment of the present disclosure;

[0029] Figure 8 , Figure 9 and Figure 10 respectively show the steel truss side view structure schematic diagram of the top chord steel bar, the top chord steel pipe and the top chord steel plate in the embodiment of the present disclosure;

[0030] Figure 11 and Figure 12 respectively show the free-standing formwork combined prefabricated composite floor slab installation structure front view of the wave-shaped web and the inverted sharp-angle-shaped web connection mode in the embodiment of the present disclosure;

[0031] Figure 13 and Figure 14 respectively show the free-standing formwork combined prefabricated composite floor slab installation structure top view of the wave-shaped web and the inverted sharp-angle-shaped web connection mode in the embodiment of the present disclosure.

[0032] Reference signs:

[0033] 100 composite bottom plate; 101 bottom plate thin steel plate; 102 steel plate buckle groove; 103 bottom plate prefabricated ultra-high performance (UHPC) fiber concrete plate; 200 truss; 201 top chord steel bar; 202 top chord steel pipe; 203 top chord steel plate; 204 bottom chord steel bar; 205 web; 2051 wave-shaped web; 2052 inverted sharp-angle-shaped web Λ; 301 steel beam; 302 bolt. DETAILED DESCRIPTION

[0034] Example embodiments are now described in greater detail with reference to the figures. Such example embodiments can be implemented in any number of ways, and are not limited to the example embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the inventive concept to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0035] Moreover, the drawings are not necessarily to scale.

[0036] The present example embodiment provides a demoulding-free bottom mould combined prefabricated composite floor support plate, which can include a composite bottom mould 100 and a plurality of trusses 200. The plurality of trusses 200 are parallel to each other and welded on a steel plate in a number required by engineering design, and then a vertical support member is arranged under the steel plate to cast a pre-set thickness of ultra-high performance fibre concrete.

[0037] Specifically, the demoulding-free bottom mould combined prefabricated composite floor support plate mainly consists of three parts: a thin steel plate 101, a prefabricated ultra-high performance (UHPC) fibre concrete plate 103 and a plurality of trusses 200. In the present embodiment, the connection of the truss, the steel plate and the concrete plate is achieved by welding the truss 200 on the steel plate 101 and then casting a pre-set thickness of ultra-high performance fibre concrete 103, which not only avoids the problem of concrete leakage caused by the opening of the concrete plate 103 to fix the truss 200, but also improves the bending stiffness of the steel plate, thereby avoiding the problem of concrete leakage caused by the warping and deformation of the steel plate 101 at the end of the steel plate during the casting of the concrete. When the ultra-high performance fibre concrete 103 is cast, it is ensured that its weight is borne by the vertical support arranged under the steel plate until the concrete 103 reaches the initial setting strength, and then the vertical support is removed.

[0038] In this embodiment, the bottom plate 100 is a composite member in which the ultra-high performance fiber concrete 103 is cast on the steel plate 101. The precast ultra-high performance fiber concrete bottom plate 103 is generally selected from a UHPC base with a strength grade of 120 MPa. According to the calculation of the same plate bottom without cracking, the equivalent section height of the UHPC member is only 1 / 9 of that of the ordinary concrete member, so the thickness of the precast concrete bottom plate in this embodiment can be only 15 mm and ensure that it does not crack during the construction phase. In addition, when the UHPC bending toughness is used as the main evaluation standard, 2.5% of long steel fibers can be added. During construction, the steel plate is effectively combined with the concrete interface by roughening the steel plate 101, and the steel truss, UHPC plate and steel plate are considered to work together during the internal force calculation of the combined precast composite floor slab without disassembly of the bottom mold. Therefore, the thickness of the precast concrete plate 103 is determined by the combined strength parameters of the ultra-high performance concrete and the steel plate along the height direction of the plate to further optimize the thickness of the bottom plate; secondly, it is not easy to crack during transportation and construction, and the yield rate is high.

[0039] Optionally, in some embodiments, when the combined precast composite floor slab without disassembly of the bottom mold is overlapped on the I-shaped steel beam, the protruding buckle grooves 102 of the adjacent steel plates 101 can be overlapped or simply stacked, and then fixed on the steel beam 301 by bolts 302 or welding method (such as Figures 11-14 ), and then the force negative reinforcement is bound on site and the concrete is poured, so as to realize the efficient load transfer system of the combined precast plate and beam and avoid the problem of grouting leakage in the post-pouring zone.

[0040] Optionally, in some embodiments, the truss 200 can use upper chord steel bars 201, upper chord steel pipes 202 or upper chord steel plates 203 (such as Figures 8-10 ). Among them, the grouting steel pipe upper chord 202 is considered as a new type of composite material composed of steel pipe and mortar, that is, the steel pipe and mortar work together, and the modulus and stiffness indexes of the member are determined by the combined performance indexes and geometric parameters of the composite material according to the design method of the steel pipe concrete structure member. Similarly, the bearing capacity of the upper chord steel material 203 is determined according to the design method of the composite material. Whether to use steel bars, steel pipes or steel plates is determined according to the engineering design and construction requirements.

[0041] Optionally, in some embodiments, the upper chord steel bars 201, upper chord steel pipes 202 or upper chord steel materials 203 of the truss 200 are connected with the lower chord steel bars 204 by web bars 205; the shape of the web bar connection is a wave shape 2051 or a cross section is Λ 2052 (inverted sharp angle shape). When it is a wave-shaped web bar, the web bar is welded to the side surface of the upper chord and lower chord steel bars, and when it is an inverted sharp angle-shaped web bar, the upper chord and lower chord steel bars are inside the web bar. The size parameters of the truss 200, the size of the upper and lower chord materials (201-205) and the spacing of the truss 200 are related to the design and construction requirements.

[0042] In the description of the disclosure, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. 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 disclosure. In the description of the disclosure, the illustrative description of the above terms does 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. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the specification.

[0043] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses or adaptive changes of the disclosure that follow the general principles of the disclosure and include known or customary practices in the art of the disclosure. The specification and examples are to be regarded as illustrative only, and the true scope and spirit of the disclosure are indicated by the appended claims.

Claims

1. A disassembly-free bottom mold combined prefabricated composite floor support plate, characterized in that, It comprises: A composite bottom plate (100) comprising a thin steel plate (101) as a bottom die and a pre-set thickness of ultra-high performance fiber concrete plate (103) poured thereon; A plurality of steel bar trusses (200) welded on the thin steel plate (101), and the thin steel plate also serves as a formwork for pouring the ultra-high performance fiber concrete plate; The ultra-high performance fiber concrete plate (103) can adopt three strength grades of 120 MPa, 150 MPa and 160 MPa of ultra-high performance concrete matrix material, and three types of steel fibers of long fiber, short fiber and micro fiber; A plurality of steel bar trusses, each of which is welded on the thin steel plate along the length direction of the bottom plate and then poured with concrete; Each of the steel bar trusses (200) comprises a top chord steel bar (201) or a top chord steel pipe (202) or a top chord steel plate (203), a bottom chord steel bar (204) and a wave-shaped web steel bar (2051) or an inverted sharp corner-shaped web steel bar (2052) connecting structure: The top chord steel bar (201) or the top chord steel pipe (202) or the top chord steel plate (203) is located at the top of the truss; The two bottom chord steel bars (204) are located on both sides of the bottom of the truss; the top chord and the bottom chord steel bars (204) on both sides of the bottom of the truss are parallel to each other, and the top chord and the bottom chord steel bars (204) on both sides of the bottom of the truss are connected by web steel bars respectively; The cross section of the web steel bar (205) is a wave-shaped web steel bar (2051) or an inverted sharp corner-shaped web steel bar (2052), the wave crest and the wave trough of the wave-shaped web steel bar (2051) are welded with the top chord and the same side bottom chord respectively, and the sharp corner of the inverted sharp corner-shaped web steel bar (2052) is welded with the top chord, and the two sides of the inverted sharp corner-shaped web steel bar are welded with the two bottom chords respectively.

2. The disassembly-free bottom mold combined prefabricated composite floor support plate according to claim 1, characterized in that, When the composite bottom plate is supported on the I-shaped steel beam (301), the adjacent bottom steel plates are extended along the plate edge in the shape of a buckle groove (102) to realize that the adjacent floor support plates can be tightly engaged with each other by the buckle groove (102) to avoid the problem of concrete leakage during pouring of the post-pouring belt.

3. The disassembly-free bottom mold combined prefabricated composite floor support plate according to claim 2, characterized in that, The bottom steel plates of the disassembly-free bottom die combined prefabricated composite floor support plate are engaged with each other by the buckle groove (102), the left side steel plate first extends horizontally to the right of the concrete bottom plate, then bends upward, then bends to the right, and finally bends downward; the right side steel plate first extends horizontally to the left of the concrete bottom plate, then bends upward, then bends to the left, and finally bends downward.

4. The disassembly-free bottom mold combined prefabricated composite floor support plate according to claim 2, characterized in that, After the buckle grooves (102) of the mutually engaged steel plates overlap, they form a "П" shape to ensure seamless lapping.

5. The disassembly-free bottom mold combined prefabricated composite floor sheating slab according to claim 1, characterized in that, The prefabricated concrete thickness of the composite bottom plate is determined according to the height of the tensile area of the composite plate.

6. The disassembly-free bottom mold combined prefabricated composite floor sheating slab according to claim 1, characterized in that, The thickness of the thin steel plate (101) of the bottom plate is 0.5 mm.

7. The disassembly-free bottom mold combined prefabricated composite floor sheating slab according to claim 1, characterized in that, The diameters of the top chord steel bar (201) and the bottom chord steel bar (204) of the truss are 6 mm to 12 mm, the diameter of the top chord steel pipe (202) is 25 mm to 30 mm, the width of the top chord steel plate (203) is 75 mm to 85 mm, and the diameter of the web steel bar (205) is 4.5 mm to 5.5 mm.

8. The disassembly-free bottom mold combined prefabricated composite floor sheating slab according to claim 1, characterized in that, The preset distance of the truss (200) is 150 mm to 400 mm.

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