Method for preparing and stacking steel rib prestressed concrete composite slab

Abstract

The application discloses a kind of preparation and stacking method of steel rib prestressed concrete composite slab, belong to the field of prefabricated building, the present application is provided with support block on steel rib, support block includes shell structure, concrete core is provided in shell structure, and the upper support structure and the lower support structure of support block are respectively cast in concrete upper flange and prestressed concrete bottom plate, and the top end surface of upper support structure and the bottom end surface of lower support structure are flush with the top surface of concrete upper flange and the bottom surface of prestressed concrete bottom plate respectively.Support block provided with steel rib limiting, prevent steel rib and steel rib and concrete upper flange from being inclined deformation, can also be used as the stacking support device of steel rib prestressed concrete composite slab.The present application is high in production efficiency, simple in structure, convenient in installation and positioning, can effectively limit steel rib displacement, improve steel rib stability, prevent steel rib and concrete upper flange from being inclined deformation, optimize the stress of stacking, stacking is safe and reliable, prevent concrete from being crushed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prefabricated buildings, in particular to a preparation and stacking method of a steel rib prestressed concrete composite slab. BACKGROUND

[0002] Prefabricated buildings are gradually becoming the main trend of today's Chinese construction industry. In order to adapt to the rapid development of prefabricated buildings, various types of prefabricated floors and composite slabs have appeared in the construction market. The traditional prefabricated floors and composite slabs mainly have the disadvantages of large self-weight, high cost, poor structural integrity, low production efficiency, etc. The steel rib prestressed concrete composite slab solves the above problems to a certain extent. The steel rib prestressed concrete composite slab comprises a steel rib, a concrete upper flange and a bottom plate. The top and bottom of the steel rib are respectively cast in the concrete upper flange and the bottom plate.

[0003] The production of the steel rib prestressed concrete composite slab of the prior art mainly includes two steps: Step 1, the steel rib is inverted, a mold for the concrete upper flange is set, the upper flange steel bars are arranged as needed, the concrete of the upper flange is poured, and the concrete is cured until it reaches the design strength and the mold is removed, forming an integrated part of the concrete upper flange and the steel rib. Step 2, a mold for the bottom plate is set, the integrated part of the concrete upper flange and the steel rib is turned over by 180 degrees, the bottom plate steel bars are arranged as needed, the bottom plate concrete is poured, and the mold is removed after the bottom plate concrete is cured to the design strength, obtaining the overall steel rib prestressed concrete composite slab.

[0004] In Step 1, there are problems of difficult positioning and limiting of the steel rib, poor stability, and the steel rib is prone to lateral deformation or torsion due to its long length and thin thickness. In Step 2, there are problems of not straight, easy to tilt or fall of the steel rib and the concrete upper flange.

[0005] In addition, the steel rib prestressed concrete composite slab of the prior art is prone to damage of the concrete upper flange and the steel rib when stacked. To solve this problem, a cushion (flat wooden block cushion) is generally placed at both ends of the bottom plate of the lower steel rib prestressed concrete composite slab near the steel rib, and the upper steel rib prestressed concrete composite slab is placed on the cushion. Although this stacking method can avoid the compression damage of the concrete upper flange and the steel rib, the pressure of stacking will cause the bottom plate to crack through the cushion due to the thinness of the bottom plate. In order to ensure the stacking quality, it is also necessary to ensure that the surface of the wooden block is flat, the size is consistent, and the wooden block resting position on the upper surface of the bottom plate is flat and smooth, which increases unnecessary production quality control links and production costs, and is not conducive to popularization and application. SUMMARY

[0006] The application provides a steel rib prestressed concrete composite slab preparation and stacking method, which is high in production efficiency, simple in structure, convenient to install and position, high in safety, can effectively limit steel rib displacement, improve steel rib stability, prevent steel rib and concrete upper flange from tilting and deforming, optimize stress of stacking, and is safe and reliable in stacking and can prevent concrete from being crushed.

[0007] The application provides the technical scheme as follows:

[0008] A steel rib prestressed concrete composite slab preparation method, the steel rib prestressed concrete composite slab comprises a prestressed concrete bottom plate, at least one group of upper structures is arranged on the prestressed concrete bottom plate, each group of upper structures comprises a concrete upper flange, a steel rib and at least four supporting blocks, the concrete upper flange is located at a set height above the prestressed concrete bottom plate, the steel rib is located between the prestressed concrete bottom plate and the concrete upper flange, and lower and upper ends of the steel rib are cast in the prestressed concrete bottom plate and the concrete upper flange respectively.

[0009] The supporting block comprises a shell structure, a concrete core is arranged in the shell structure, and a vertical upper supporting structure and a vertical lower supporting structure are arranged on a top end face and a bottom end face of the shell structure respectively; the shell structures of two supporting blocks are fixed on two sides of a design position of a web of the steel rib respectively, and adjacent two design positions are spaced apart by a set distance; the upper supporting structure and the lower supporting structure are cast in the concrete upper flange and the prestressed concrete bottom plate respectively, and a top end face of the upper supporting structure and a bottom end face of the lower supporting structure are flush with a top surface of the concrete upper flange and a bottom surface of the prestressed concrete bottom plate respectively.

[0010] The preparation method comprises the following steps.

[0011] S1: the steel rib and the supporting block are manufactured according to design requirements;

[0012] S2: for each design position of the steel rib, the shell structures of two supporting blocks are fixedly connected on two sides of the design position of the steel rib;

[0013] S3: the steel rib with the supporting blocks is inverted on a mold table, so that the top end face of the upper supporting structure is placed on an upper surface of the mold table, an upper flange mold is arranged, upper flange concrete is cast, and after curing until the upper flange concrete reaches a design strength, the mold is removed, thereby forming an integrated part of the concrete upper flange, the steel rib and the supporting blocks;

[0014] S4: the integrated part is turned over by 180 degrees and placed on the mold table, so that the bottom end face of the lower supporting structure is placed on the upper surface of the mold table, a bottom plate mold is arranged, bottom plate concrete is cast, and after curing until the bottom plate concrete reaches the design strength, the mold is removed, thereby obtaining the overall steel rib prestressed concrete composite slab.

[0015] Further, the material of the shell structure, the upper support structure and the lower support structure is steel, hard plastic or glass steel, the shape of the shell structure is a cuboid, and the upper support structure and the lower support structure are support plates or support legs which are integrally formed with the shell structure.

[0016] Further, the shell structure is provided with a pouring hole for pouring the concrete core, and the concrete grade of the concrete core is not lower than that of the concrete upper flange and the prestressed concrete bottom plate.

[0017] Further, the prestressed concrete bottom plate comprises prestressed steel bars and bottom plate transverse distribution steel bars, and the concrete upper flange comprises longitudinal steel bars and upper flange transverse distribution steel bars.

[0018] The length direction of the support plate is parallel to the length direction of the steel rib, the support plate or support leg is arranged staggered with the prestressed steel bars and the longitudinal steel bars, and the support block is arranged staggered with the bottom plate transverse distribution steel bars and the upper flange transverse distribution steel bars.

[0019] The S3 further comprises the following steps before pouring the upper flange concrete:

[0020] The inner surface of the upper flange mold is brushed with a release agent, and the longitudinal steel bars and the upper flange transverse distribution steel bars are bound.

[0021] The S4 further comprises the following steps before pouring the bottom plate concrete:

[0022] The inner surface of the bottom plate mold is brushed with a release agent, the bottom plate transverse distribution steel bars are laid, and the prestressed steel bars are tensioned.

[0023] Further, the top end and the bottom end of the web plate are respectively provided with an upper flange plate and a lower flange plate, the height of the shell structure is not greater than the net height of the web plate, and the upper support structure and the lower support structure are respectively located outside the upper flange plate and the lower flange plate.

[0024] Further, the cross section of the steel rib is Z-shaped, C-shaped or H-shaped.

[0025] Further, the upper flange plate and the lower flange plate are provided with pouring anchoring holes, and the web plate is provided with a through hole.

[0026] Further, the design position is located outside the hoisting point of the steel rib prestressed concrete composite slab, the distance between the design position and the end of the concrete upper flange is not greater than 300 mm, and the distance between two adjacent design positions on the steel rib is not greater than 2200 mm.

[0027] The length of the shell structure is not less than 100 mm, the width is not greater than 1 / 2 of the width of the upper flange of the concrete, the height is not less than 95 mm, and the thickness is not less than 5 mm.

[0028] Further, the support plate is a straight plate or a corrugated plate, and the number of support legs of each support block is two.

[0029] Further, the shell structure is fixed on the side of the web of the steel rib by an adhesive.

[0030] Further, each upper structure comprises a plurality of steel ribs arranged in parallel and spaced apart from each other, and the shell structure is fixed on the web of the outermost steel rib.

[0031] A stacking method of a steel rib prestressed concrete composite slab, characterized in that the steel rib prestressed concrete composite slab is prepared by the preparation method of the steel rib prestressed concrete composite slab.

[0032] The stacking method comprises:

[0033] S10: The bottom layer of the steel rib prestressed concrete composite slab is stably placed in the specified position by a lifting tool.

[0034] S11: A flexible gasket is placed on the top surface of the concrete upper flange at the support block, and the flexible gasket is located on the upper support structure, the horizontal size of the flexible gasket is not greater than the overall horizontal size of the two support blocks, and the center position of the flexible gasket is consistent with the overall center position of the two support blocks.

[0035] S12: The upper layer of the steel rib prestressed concrete composite slab is stably placed on the flexible gasket of the lower layer of the steel rib prestressed concrete composite slab by a lifting tool, and the lower support structure of the upper layer is pressed on the flexible gasket of the lower layer; this is repeated until the stacking is completed, and the number of stacked layers is not more than 9.

[0036] The present application has the following beneficial effects:

[0037] The present application sets support blocks on the steel ribs, and makes the upper support structure and the lower support structure of the support blocks respectively cast in the concrete upper flange and the prestressed concrete bottom plate, and the top end surface of the upper support structure and the bottom end surface of the lower support structure are flush with the top surface of the concrete upper flange and the bottom surface of the prestressed concrete bottom plate, respectively. The support block has the functions of limiting the steel rib, preventing the steel rib and the steel rib from tilting and deforming with the concrete upper flange, and can also be used as a stacking support device for the steel rib prestressed concrete composite slab.

[0038] In the process of preparing the steel rib prestressed concrete composite slab, the support block can be used as the supporting, limiting and stabilizing device of the steel rib when pouring the concrete upper flange and the steel rib, so as to prevent the steel rib from being deviated, twisted or deformed in an inclined manner. When pouring the bottom plate concrete, the support block can be used as the supporting, limiting and stabilizing device of the integrated steel rib and the concrete upper flange, so as to prevent the occurrence of the problems such as being not straight, being deviated, being twisted or being deformed in an inclined manner. That is, the support block effectively plays the limiting, supporting and fixing roles on the steel rib and the concrete upper flange, effectively solves the problems such as the instability, the being not straight, the deformation in an inclined manner and the like of the steel rib and the concrete upper flange in the pouring process of the steel rib and the concrete upper flange of the prefabricated bottom plate, and thus the production quality and the manufacturing efficiency of the steel rib prestressed concrete composite slab are improved.

[0039] After the preparation of the steel rib prestressed concrete composite slab is completed, the support block, the upper flange of the steel rib prestressed concrete composite slab and the prefabricated bottom plate form an integral whole, and the support block can be used as the stacking device to bear the vertical load of the upper layer. When stacking, the support block can be quickly found, and then the flexible gasket is arranged on the support block, and the layers are stacked, so that the positioning is accurate, the stress is optimal, the safety is high, and the concrete upper flange, the steel rib and the prestressed concrete bottom plate are prevented from being crushed. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a sectional view of the steel rib prestressed concrete composite slab of the present application;

[0041] Figure 2 It is a perspective view of the steel rib;

[0042] Figure 3 It is a perspective view of the shell structure;

[0043] Figure 4 It is a perspective view of the support block;

[0044] Figure 5 It is a schematic view of the fixed connection between the steel rib and the support block;

[0045] Figure 6 It is a schematic view of the integrated part of the concrete upper flange, the steel rib and the support block;

[0046] Figure 7 It is a schematic view of the steel rib prestressed concrete composite slab of the present application;

[0047] Figure 8 It is a stacking schematic view of the steel rib prestressed concrete composite slab of the present application. DETAILED DESCRIPTION

[0048] In order to make the technical problems, technical solutions and advantages of the present application clearer, the following will be described in detail with reference to the drawings and specific embodiments.

[0049] The embodiment of the present application provides a preparation method of a steel rib prestressed concrete composite slab, as shown in the figure Figures 1-8 The steel rib prestressed concrete composite slab comprises a prestressed concrete bottom plate 100, and at least one group of upper structures 200 is arranged on the prestressed concrete bottom plate. Each group of upper structures 200 comprises a concrete upper flange 300, at least one steel rib 400 and at least four supporting blocks 500. The concrete upper flange 300 is located at a set height above the prestressed concrete bottom plate 100, the steel rib 400 is located between the prestressed concrete bottom plate 100 and the concrete upper flange 300, and the lower end and the upper end of the steel rib 400 are respectively cast in the prestressed concrete bottom plate 100 and the concrete upper flange 300 to form an integral steel rib prestressed concrete composite slab.

[0050] The supporting block 500 comprises a shell structure 1, and a concrete core 13 is arranged in the shell structure 1. Through the composite arrangement of the shell structure 1 and the concrete core 13, on the one hand, the material consumption of the shell structure of the supporting block is reduced (compared with the solid supporting block), and the cost is reduced, and on the other hand, the strength of the supporting block 500 is improved through the composite structure.

[0051] The top end face and the bottom end face of the shell structure 1 are respectively provided with vertical upper support structures 2 and lower support structures 3. The upper support structure 2 is located on the top end face of the shell structure 1 and vertically extends upward by a certain height. The lower support structure 3 is located on the bottom end face of the shell structure 1 and vertically extends downward by a certain height.

[0052] The steel rib 400 has a plurality of design positions, and adjacent two design positions are spaced apart by a set distance. For each design position, the shell structures 1 of two supporting blocks 500 are fixed on both sides of the design position of the web 4 of the steel rib 400, and as an optimization, the two supporting blocks 500 are symmetrically arranged on both sides of the web 4. The upper support structure 2 and the lower support structure 3 are respectively cast in the concrete upper flange 300 and the prestressed concrete bottom plate 100, and in some examples, part of the top of the shell structure 1 and part of the bottom of the shell structure 1 are also respectively cast in the concrete upper flange 300 and the prestressed concrete bottom plate 100.

[0053] The top end face of the upper support structure 2 and the bottom end face of the lower support structure 3 are flush with the top surface of the concrete upper flange 300 and the bottom surface of the prestressed concrete bottom plate 100 respectively.

[0054] Based on the structure of the steel rib prestressed concrete composite slab, the preparation method comprises the following steps:

[0055] S1: The steel rib 400 and the supporting block 500 are manufactured according to the design requirements.

[0056] In this step, the steel plate needs to be cut, straightened and bent to form the steel rib 400 according to the design requirements of the steel rib prestressed concrete composite slab, and the support block 500 needs to be processed according to the structure and size design requirements of the support block.

[0057] S2: The shell structure 1 of the two support blocks 500 is fixedly connected on both sides of the design position of the steel rib 400.

[0058] S3: The steel rib 400 with the support block 500 is inverted on the mold table, so that the top end face of the upper support structure 2 is placed on the upper surface of the mold table, the upper flange mold is arranged, the upper flange concrete is poured, and the mold is removed after the upper flange concrete reaches the design strength to form an integrated part of the concrete upper flange 300, the steel rib 400 and the support block 500.

[0059] In the process of manufacturing the integrated part of the concrete upper flange 300, the steel rib 400 and the support block 500, the upper support structure 2 of the support block 500 is supported on the mold table, and the support block 500 supports and limits the steel rib 400, so that the positioning of the steel rib 400 is realized without the need to set an additional positioning structure of the steel rib, and the stability of the steel rib is good, and problems such as lateral deformation or torsion do not exist.

[0060] The upper support structure 2 has a set height for providing a set gap between the shell structure 1 and the mold table, so as to facilitate the formation of a certain thickness of the concrete protective layer of the concrete upper flange 300 above the shell structure 1.

[0061] S4: The integrated part is turned over by 180 degrees and placed on the mold table, so that the bottom end face of the lower support structure 3 is placed on the upper surface of the mold table, the bottom plate mold is arranged, and the bottom plate concrete is poured.

[0062] After the mold is removed, the concrete upper flange 300, the steel rib 400, the support block 500 and the prestressed concrete bottom plate 100 become an organic whole, and the overall steel rib prestressed concrete composite slab is obtained.

[0063] In the process of manufacturing the prestressed concrete bottom plate 100, the support block 500 supports, limits and prevents the inclination deformation of the steel rib 400 and the concrete upper flange 300, prevents the inclination or tilting of the steel rib 400 and the concrete upper flange 300, and prevents the problems such as the unevenness of the steel rib and the concrete upper flange caused by the deformation of the steel rib 400.

[0064] The lower support structure 3 has a set height for providing a set gap between the shell structure 1 and the mold table, so as to facilitate the formation of a certain thickness of the concrete protective layer of the prestressed concrete bottom plate 100 below the shell structure 1.

[0065] The stacking method of the steel rib prestressed concrete composite slab comprises the following steps:

[0066] S10: Transport and hoist the steel rib prestressed concrete composite slab to the stacking site, stably place the bottom layer of the steel rib prestressed concrete composite slab on the specified position through the lifting tool, and remove the lifting tool.

[0067] S11: Place a flexible pad such as a wooden board or rubber on the top surface of the upper flange of the concrete at the support block, and ensure that the flexible pad is above the upper support structure, the horizontal size of the flexible pad is not greater than the overall horizontal size of the two support blocks, and the center position of the flexible pad is consistent with the overall center position of the two support blocks.

[0068] S12: Stably place the upper layer of the steel rib prestressed concrete composite slab on the flexible pad of the lower layer of the steel rib prestressed concrete composite slab through the lifting tool, and ensure that the lower support structure of the upper layer is pressed on the flexible pad of the lower layer; repeat the process until the stacking is completed, and the number of stacked layers is not more than 9.

[0069] When the multi-layer steel rib prestressed concrete composite slab is stacked, the vertical load generated by the steel rib prestressed concrete composite slab is borne by the support block, and the vertical load is directly transmitted vertically through the pad, the upper flange and the support block, and finally to the foundation, so that the force transmission of the stacking is simple, labor is saved, cost is low, and it is safe and reliable, and the concrete upper flange, the steel rib and the prestressed concrete bottom plate will not be damaged.

[0070] The support block is arranged on the steel rib, the upper support structure and the lower support structure of the support block are respectively cast in the concrete upper flange and the prestressed concrete bottom plate, and the top end surface of the upper support structure and the bottom end surface of the lower support structure are flush with the top surface of the concrete upper flange and the bottom surface of the prestressed concrete bottom plate respectively. The support block has the functions of limiting the steel rib, preventing the steel rib and the concrete upper flange from being deformed obliquely, and can also be used as a stacking support device of the steel rib prestressed concrete composite slab.

[0071] During the preparation of the steel rib prestressed concrete composite slab, when the concrete upper flange and the steel rib are cast, the support block can be used as a support, limiting and stabilizing device of the steel rib to prevent the steel rib from being deviated, twisted or deformed obliquely. When the bottom plate concrete is cast, the support block can be used as a support, limiting and stabilizing device of the integrated steel rib and the concrete upper flange to prevent the integrated steel rib and the concrete upper flange from being deviated, twisted or deformed obliquely. That is, the support block effectively limits, supports and fixes the steel rib and the concrete upper flange, effectively solves the problems of instability, unstraightness and oblique deformation of the steel rib and the concrete upper flange during the casting process of the steel rib and the concrete upper flange and the prefabricated bottom plate, and improves the production quality and manufacturing efficiency of the steel rib prestressed concrete composite slab.

[0072] After the steel rib prestressed concrete composite slab is prepared, the support block, the upper flange of the steel rib prestressed concrete composite slab and the prefabricated bottom plate form a whole, and the support block can be used as a stacking device to bear the vertical load of the upper layer. When stacking, the support block can be quickly found, and then a flexible gasket is arranged on the support block, and the layers are stacked, which is accurate in positioning, excellent in stress, high in safety, prevents the concrete upper flange, the steel rib and the prestressed concrete bottom plate from being crushed.

[0073] In the present application, one specific implementation of the support block is that the shell structure 1 is a hollow cuboid structure, and the materials of the shell structure 1, the upper support structure 2 and the lower support structure 3 can be steel, hard plastic or glass steel, etc., which are convenient for forming, and the compressive strength thereof should be the same as or slightly higher than that of the concrete upper flange. The hard plastic can be polyvinyl chloride (PVC) or polycarbonate (PC) etc.

[0074] The upper support structure 2 and the lower support structure 3 are support plates or support legs, which are integrally formed with the shell structure 1. The support block of the present application has the advantages of simple process, low production cost, high production efficiency, convenient on-site installation and positioning, and high safety, and can meet the requirements of factory batch production and transportation.

[0075] The support plate can be a straight plate or a corrugated plate, and the support leg can be a cylinder. The number of support legs of each support block 500 can be two, so that the support is more stable.

[0076] The shell structure 1 is provided with a pouring hole 14 for pouring to form a concrete core 13. The concrete grade of the concrete core 13 is not lower than that of the concrete upper flange 300 and the prestressed concrete bottom plate 100. The pouring hole 14 can be horizontally arranged on one side of the shell structure 1.

[0077] The aforementioned prestressed concrete bottom plate 100 can further include prestressed steel bars 5 and bottom plate transverse distribution steel bars 6, and the prestressed steel bars 5 are arranged along the length direction of the prestressed concrete bottom plate 100. The concrete upper flange 300 includes longitudinal steel bars 7 and upper flange transverse distribution steel bars 8, and the longitudinal steel bars 7 are arranged along the length direction of the concrete upper flange 300.

[0078] The length direction of the support plate is parallel to the length direction of the steel rib 400 and parallel to the prestressed steel bars 5, which prevents the arrangement of the prestressed steel bars 5 and the longitudinal steel bars 7 from being affected, so that the support plate or the support leg can be arranged staggered with the prestressed steel bars 5 and the longitudinal steel bars 7. The length of the support block 500 is smaller than the spacing between the adjacent bottom plate transverse distribution steel bars 6 and the upper flange transverse distribution steel bars 8, so that the support block 500 can be arranged staggered with the bottom plate transverse distribution steel bars 6 and the upper flange transverse distribution steel bars 8 as a whole. The support block 500 prevents the arrangement of the steel bars of the prestressed concrete bottom plate 100 and the concrete upper flange 300 from being affected.

[0079] Correspondingly, the aforementioned S3 further comprises: brushing a release agent on the inner surface of the upper flange mold to facilitate demolding before pouring the concrete of the upper flange; and binding the longitudinal steel bars 7 and the upper flange transverse distribution steel bars 8 to form the steel bar mesh of the concrete upper flange.

[0080] Similarly, the aforementioned S4 further comprises: brushing a release agent on the inner surface of the bottom plate mold and arranging the bottom plate transverse distribution steel bars 6 before pouring the concrete of the bottom plate; and tensioning the prestressed steel bars 5.

[0081] The top end and the bottom end of the web plate 4 of the steel rib 400 are respectively provided with an upper flange plate 9 and a lower flange plate 10, and the cross section of the steel rib can be selected as Z type, C type or H type. The height of the shell structure 1 is less than the net height of the web plate 4, and as a preferred, the height of the shell structure 1 can be equal to the net height of the web plate 4. The upper support structure 2 and the lower support structure 3 are respectively located outside the upper flange plate 9 and the lower flange plate 10.

[0082] The upper flange plate 9 and the lower flange plate 10 can be provided with pouring anchor holes 11, which are used to form the concrete pin bolt effect at the pouring anchor holes during pouring of the concrete, thereby enhancing the anchoring effect. The web plate 4 can be provided with a through hole 12, which is used for threading steel bars and pipelines when the steel rib prestressed concrete composite slab is in use. The pouring anchor hole 11 and the through hole 12 can be round holes, and the pouring anchor hole 11 and the through hole 12 can be machined when the steel rib 400 is manufactured in S1.

[0083] The aforementioned design position is located outside the hoisting point of the steel rib prestressed concrete composite slab, and the distance between the design position and the end of the concrete upper flange 300 is not greater than 300 mm, and the distance between two adjacent design positions on the steel rib 400 is not greater than 2200 mm.

[0084] The length of the shell structure 1 is not less than 100 mm, and the width is not greater than 1 / 2 of the width of the concrete upper flange, for example, 60 mm. And the height of the shell structure 1 can be determined according to the design, for example, it can be adjusted according to the total height of the composite slab to adapt to different steel rib prestressed concrete composite slab production requirements, but it should not be less than 95 mm, for example, the value is 105 mm. The thickness of the shell structure 1 is not less than 5 mm.

[0085] In the present application, the shell structure 1 can be fixed on the side surface of the web plate 4 of the steel rib 400 by an adhesive. When fixed, the inner side surface of the shell structure 1 is pasted with an adhesive on the surface of the web plate 4 and is bonded, so that the steel rib and the support block form a whole. The adhesive can be a fast-drying adhesive such as epoxy resin.

[0086] When the height of the shell structure 1 is equal to or slightly less than the net height of the web plate 4, an adhesive such as epoxy resin can also be brushed on the upper and lower end surfaces of the shell structure 1 and the upper flange plate 9 and the lower flange plate 10 of the steel rib 400 and bonded, thereby enhancing the bonding effect.

[0087] The steel rib 400 of the upper structure of the present application can be one or more. When each upper structure includes a plurality of steel ribs 400, the plurality of steel ribs 400 are arranged in parallel at intervals from each other, and the shell structure 1 is fixed to the web of the outermost steel rib.

[0088] The above is the preferred embodiment of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered as the protection scope of the present application.

Claims

1. A method for preparing a steel-ribbed prestressed concrete composite slab, characterized in that, The steel-ribbed prestressed concrete composite slab includes a prestressed concrete base slab, on which at least one set of superstructures is provided. Each set of superstructures includes a concrete upper flange, steel ribs, and at least four support blocks. The concrete upper flange is located at a set height above the prestressed concrete base slab. The steel ribs are located between the prestressed concrete base slab and the concrete upper flange. The lower end and upper end of the steel ribs are respectively cast into the prestressed concrete base slab and the concrete upper flange. The support block includes a shell structure, within which a concrete core is provided. Vertical upper and lower support structures are respectively provided on the top and bottom surfaces of the shell structure. The shell structures of the two support blocks are respectively fixed on both sides of the designed position of the web of the steel rib, with a set distance between adjacent designed positions. The upper and lower support structures are respectively cast in the upper concrete flange and the prestressed concrete base plate, with the top surface of the upper support structure and the bottom surface of the lower support structure flush with the top surface of the upper concrete flange and the bottom surface of the prestressed concrete base plate, respectively. The preparation method includes: S1: Fabricate the steel ribs and the support blocks according to the design requirements; S2: For each designed position of the steel rib, the shell structure of the two support blocks is fixedly connected to both sides of the designed position of the steel rib; S3: Invert the steel rib with support block on the mold table, so that the top surface of the upper support structure is placed on the upper surface of the mold table, support the upper flange mold, pour the upper flange concrete, and remove the mold after curing until the upper flange concrete reaches the design strength, forming an integrated component of concrete upper flange, steel rib and support block. S4: After flipping the integrated component 180 degrees, place it on the mold table, so that the bottom end face of the lower support structure is placed on the upper surface of the mold table. Set up the base plate mold, pour the base plate concrete, and after curing until the base plate concrete reaches the design strength, remove the mold to obtain the overall steel rib prestressed concrete composite slab.

2. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 1, characterized in that, The shell structure, upper support structure, and lower support structure are made of steel, rigid plastic, or fiberglass. The shell structure is rectangular in shape. The upper support structure and lower support structure are support plates or support legs, which are integrally formed with the shell structure.

3. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 2, characterized in that, The shell structure is provided with injection holes for injecting the concrete core, and the concrete grade of the concrete core is not lower than that of the upper flange of the concrete core and the prestressed concrete base plate.

4. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 2, characterized in that, The prestressed concrete base slab includes prestressed steel bars and transversely distributed steel bars in the base slab, and the concrete upper flange includes longitudinal steel bars and transversely distributed steel bars in the upper flange. The length direction of the support plate is parallel to the length direction of the steel rib. The support plate or support leg is staggered from the prestressed steel bars and longitudinal steel bars. The support block as a whole is staggered from the transversely distributed steel bars of the bottom plate and the transversely distributed steel bars of the upper flange. S3 also includes the following steps before pouring the upper flange concrete: Apply a release agent to the inner surface of the upper flange mold, and tie the longitudinal reinforcing bars and the transversely distributed reinforcing bars of the upper flange. Before pouring the foundation slab concrete, step S4 also includes: A release agent is applied to the inner surface of the base plate mold, and transverse reinforcing bars are laid out. Prestressed reinforcing bars are then tensioned.

5. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 4, characterized in that, The top and bottom ends of the web are respectively provided with an upper flange and a lower flange. The height of the shell structure is not greater than the net height of the web. The upper support structure and the lower support structure are located on the outside of the upper flange and the lower flange, respectively.

6. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 5, characterized in that, The cross-section of the steel rib is Z-shaped, C-shaped, or H-shaped.

7. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 5, characterized in that, The upper and lower flange plates are provided with casting anchoring holes, and the web plate is provided with through holes.

8. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 5, characterized in that, The design location is located outside the hoisting point of the steel-ribbed prestressed concrete composite slab. The distance between the design location and the end of the upper flange of the concrete is no more than 300mm, and the distance between two adjacent design locations on the steel rib is no more than 2200mm. The shell structure has a length of not less than 100 mm, a width of not more than 1 / 2 the width of the upper flange of the concrete, a height of not less than 95 mm, and a thickness of not less than 5 mm.

9. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 2, characterized in that, The support plate is a straight plate or a corrugated plate, and each support block has two support legs.

10. The method for preparing a steel-ribbed prestressed concrete composite slab according to any one of claims 1-9, characterized in that, The shell structure is bonded and fixed to the side of the web of the steel rib by adhesive.

11. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 10, characterized in that, Each superstructure includes multiple steel ribs, which are spaced apart and arranged in parallel. The shell structure is fixed to the web of the outermost steel rib.

12. A method for stacking steel-ribbed prestressed concrete composite slabs, characterized in that, The steel-ribbed prestressed concrete composite slab is prepared by the preparation method of the steel-ribbed prestressed concrete composite slab according to any one of claims 1-11; The stacking method includes: S10: The bottom steel-ribbed prestressed concrete composite slab is smoothly placed into the specified position using a lifting device; S11: Place a flexible pad on the top surface of the concrete upper flange at the support block, and ensure that the flexible pad is located on the upper support structure. The horizontal dimension of the flexible pad is not greater than the overall horizontal dimension of the two support blocks, and the center position of the flexible pad is consistent with the overall center position of the two support blocks. S12: Use a hoist to smoothly place the upper layer of steel-ribbed prestressed concrete composite slab onto the flexible pad of the lower layer of steel-ribbed prestressed concrete composite slab, and ensure that the lower support structure of the upper layer presses on the flexible pad of the lower layer; repeat this process until the stacking is completed, and the number of stacked layers shall not exceed 9.

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