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 concrete block, upper support leg and lower support leg are embedded in concrete block, upper support leg and lower support leg are respectively cast in concrete upper flange and prestressed concrete bottom plate, and the top end surface of upper support leg and the bottom end surface of lower support leg are flush with the top surface of concrete upper flange and the bottom surface of prestressed concrete bottom plate respectively.The support block provided by the present application has the effect of limiting the position of steel rib, preventing the inclination deformation of steel rib and the upper flange of concrete, and can also be used as a stacking support device for steel rib prestressed concrete composite slab.The present application has high production efficiency, simple structure, convenient installation and positioning, can effectively limit the displacement of steel rib, improve the stability of steel rib, prevent the inclination deformation of steel rib and the upper flange of concrete, optimize the stress of stacking, and is safe and reliable for stacking, to prevent the 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 in installation and positioning, 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 concrete block, an upper supporting leg and a lower supporting leg are pre-embedded in the concrete block, and the upper supporting leg and the lower supporting leg vertically pass through top and bottom end faces of the concrete block upwards and downwards respectively, the concrete blocks 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, and the upper supporting leg and the lower supporting leg are cast in the concrete upper flange and the prestressed concrete bottom plate respectively, and top and bottom end faces of the upper supporting leg and the lower supporting leg 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 concrete blocks 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 leg 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 block;

[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 leg 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 concrete block is a solid cuboid concrete structure, vertical steel bars or plastic rods are embedded in the solid cuboid concrete structure, the upper and lower parts of the steel bars or plastic rods respectively vertically pass through the top end surface and bottom end surface of the concrete block to form the upper support leg and the lower support leg.

[0016] Further, the prestressed concrete bottom plate comprises prestressed steel bars and bottom plate transverse distribution steel bars, the concrete upper flange comprises longitudinal steel bars and upper flange transverse distribution steel bars;

[0017] The lower support leg and the upper support leg are respectively staggered with the prestressed steel bars and the longitudinal steel bars, and the support block is staggered with the bottom plate transverse distribution steel bars and the upper flange transverse distribution steel bars as a whole;

[0018] The S3 further comprises the following steps before pouring the concrete of the upper flange:

[0019] 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;

[0020] The S4 further comprises the following steps before pouring the concrete of the bottom plate:

[0021] The inner surface of the bottom plate mold is brushed with a release agent, the bottom plate transverse distribution steel bars are arranged, and the prestressed steel bars are tensioned.

[0022] 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 concrete block is not greater than the net height of the web plate, and the upper support leg and the lower support leg are respectively located outside the upper flange plate and the lower flange plate.

[0023] Further, the cross section of the steel rib is Z-shaped, C-shaped or H-shaped.

[0024] 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.

[0025] 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.

[0026] The length of the concrete block is not less than 100 mm, the width is not greater than 1 / 2 of the concrete upper flange, and the height is not less than 95 mm, and the bottom of the concrete block is provided with a chamfer and a slot.

[0027] Further, the number of the upper support leg and the lower support leg of each support block is two.

[0028] Further, the concrete block is fixed on the side of the web of the steel rib by an adhesive.

[0029] Alternatively, bolt holes are formed on the web of the steel rib, and bolt holes or sleeves are pre-buried on the concrete block, and the concrete block is fixed on the steel rib by bolts.

[0030] Further, each superstructure comprises a plurality of steel ribs, and the plurality of steel ribs are arranged in parallel and spaced apart from each other, and the concrete block 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 bottommost steel rib prestressed concrete composite slab is stably placed to a specified position by a lifting tool.

[0034] S11: A flexible pad is placed on the top surface of the concrete upper flange at the support block, and the flexible pad is ensured to be located on the upper support leg, 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.

[0035] S12: The upper steel rib prestressed concrete composite slab is stably placed on the flexible pad of the lower steel rib prestressed concrete composite slab by a lifting tool, and the lower support leg of the upper steel rib prestressed concrete composite slab is ensured to press on the flexible pad of the lower steel rib prestressed concrete composite slab; the above steps are 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 the support block on the steel rib, and makes the upper support leg and the lower support leg of the support block be cast in the concrete upper flange and the prestressed concrete bottom plate respectively, and the top end surface of the upper support leg and the bottom end surface of the lower support leg 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 and the concrete upper flange from being deformed, and can also be used as a stacking support device of 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 support block;

[0043] Figure 4 It is a local schematic view of the fixed connection of the steel rib and the support block;

[0044] Figure 5 It is a whole schematic view of the fixed connection of 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, the technical solutions and the advantages of the present application more clear, 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 cast in the prestressed concrete bottom plate 100 and the concrete upper flange 300 respectively to form an integrated steel rib prestressed concrete composite slab.

[0050] The supporting block 500 comprises a concrete block 1, and an upper supporting leg 2 and a lower supporting leg 3 are embedded in the concrete block 1. The upper supporting leg 2 and the lower supporting leg 3 vertically pass through the top end surface and the bottom end surface of the concrete block 1 respectively. The upper supporting leg 2 vertically passes through the top end surface of the concrete block 1 and extends vertically upward by a certain height. The lower supporting leg 3 vertically passes through the bottom end surface of the concrete block 1 and extends vertically downward by a certain height.

[0051] 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 concrete blocks 1 of two supporting blocks 500 are fixed on both sides of the design position of the web 4 of the steel rib 400. As an optimization, the two supporting blocks 500 are symmetrically arranged on both sides of the web 4. The upper supporting leg 2 and the lower supporting leg 3 are cast in the concrete upper flange 300 and the prestressed concrete bottom plate 100 respectively. In some examples, part of the top of the concrete block 1 and part of the bottom are also cast in the concrete upper flange 300 and the prestressed concrete bottom plate 100 respectively.

[0052] The top end surface of the upper supporting leg 2 and the bottom end surface of the lower supporting leg 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.

[0053] Based on the structure of the steel rib prestressed concrete composite slab, the preparation method comprises the following steps:

[0054] S1: The steel rib 400 and the supporting block 500 are manufactured according to the design requirements.

[0055] 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 supporting block 500 needs to be processed according to the structure and size design requirements of the supporting block.

[0056] S2: for each design position of the steel rib 400, the concrete block 1 of the two support blocks 500 is fixedly connected on both sides of the design position of the steel rib 400.

[0057] 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 leg 2 is placed on the upper surface of the mold table, the upper flange mold is arranged, the upper flange concrete is poured, and after the upper flange concrete reaches the design strength, the mold is removed, and an integrated component of the concrete upper flange 300, the steel rib 400 and the support block 500 is formed.

[0058] The application can realize the positioning of the steel rib 400 without setting 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.

[0059] The upper support leg 2 has a set height, which is used to make the concrete block 1 and the mold table have a set gap, so as to facilitate the concrete upper flange 300 to form a certain thickness of the concrete protective layer above the concrete block 1.

[0060] S4: the integrated component is turned over by 180 degrees and placed on the mold table, so that the bottom end face of the lower support leg 3 is placed on the upper surface of the mold table, the bottom plate mold is arranged, and the bottom plate concrete is poured.

[0061] 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.

[0062] The application can prevent the steel rib 400 and the concrete upper flange 300 from being inclined or tilted, and can prevent problems such as the steel rib and the concrete upper flange not being straight due to the deformation of the steel rib 400.

[0063] The lower support leg 3 has a set height, which is used to make the concrete block 1 and the mold table have a set gap, so as to facilitate the prestressed concrete bottom plate 100 to form a certain thickness of the concrete protective layer below the concrete block 1.

[0064] The stacking method of the above steel rib prestressed concrete composite slab comprises the following steps:

[0065] S10: Transport and hoist the steel rib prestressed concrete composite slab to the stacking site, place the bottommost steel rib prestressed concrete composite slab on the specified position by the lifting tool, and remove the lifting tool.

[0066] S11: Place a flexible pad such as a wooden board or rubber on the top surface of the concrete upper flange at the support block, and ensure that the flexible pad is above the upper support leg, 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.

[0067] S12: Place the upper layer of steel rib prestressed concrete composite slab on the flexible pad of the lower layer of steel rib prestressed concrete composite slab by the lifting tool, and ensure that the lower support leg 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.

[0068] 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 safety is reliable, and the concrete upper flange, the steel rib and the prestressed concrete bottom plate will not be damaged.

[0069] The present application sets the support block on the steel rib, and makes the upper support leg and the lower support leg of the support block be cast in the concrete upper flange and the prestressed concrete bottom plate respectively, and the top end surface of the upper support leg and the bottom end surface of the lower support leg 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.

[0070] In the process of preparing 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 present application effectively limits, supports and fixes the steel rib and the concrete upper flange through the support block, effectively solves the problems of instability, unstraightness and oblique deformation of the steel rib and the concrete upper flange in the process of casting the steel rib and the concrete upper flange, and improves the production quality and manufacturing efficiency of the steel rib prestressed concrete composite slab.

[0071] 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, so that the positioning is accurate, the stress is optimal, the safety is high, the concrete upper flange, the steel rib and the prestressed concrete bottom plate are prevented from being crushed.

[0072] In the present application, one specific implementation of the support block is that the concrete block 1 is a solid cuboid concrete structure, and the concrete strength grade used by the solid cuboid concrete structure is the same as or slightly higher than that of the composite slab. A vertical smooth round steel bar or plastic rod is embedded in the solid cuboid concrete structure, and the upper and lower parts of the smooth round steel bar or plastic rod respectively vertically pass through the top end surface and the bottom end surface of the concrete block 1 to form the upper support leg 2 and the lower support leg 3. At the same time, the smooth round steel bar or plastic rod can also be used as the steel bar of the solid cuboid concrete structure to increase the strength performance of the solid cuboid concrete structure.

[0073] The support block with the above structure of the present application has the advantages of simple process, low production cost, high production efficiency, convenient on-site installation and positioning, fast construction speed and high safety, and can meet the factory batch production and transportation.

[0074] The upper support leg 2 and the lower support leg 3 can be cylindrical, and the number of the upper support leg 2 and the lower support leg 3 of each support block 500 can be two, so that the support is more stable.

[0075] 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.

[0076] The lower support leg 3 and the upper support leg 2 are arranged staggered with the prestressed steel bars 5 and the longitudinal steel bars 7 respectively. The length of the support block 500 is less than the interval of 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 steel bar arrangement of the prestressed concrete bottom plate 100 and the concrete upper flange 300 from being adversely affected.

[0077] Correspondingly, the aforementioned S3 further includes the following steps before pouring the upper flange concrete: brushing a release agent on the inner surface of the upper flange mold to facilitate demolding, and binding the longitudinal steel bars 7 and the upper flange transverse distribution steel bars 8 to form a steel bar mesh of the concrete upper flange.

[0078] Similarly, the aforementioned S4 further comprises the following steps before pouring the bottom plate concrete: brushing the inside surface of the bottom plate mold with a release agent, and arranging the bottom plate transverse distribution steel bars 6 and tensioning the prestressed steel bars 5.

[0079] 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 concrete block 1 is less than the net height of the web plate 4, and as a preferred, the height of the concrete block 1 can be equal to the net height of the web plate 4. The upper support leg 2 and the lower support leg 3 are respectively located outside the upper flange plate 9 and the lower flange plate 10.

[0080] The upper flange plate 9 and the lower flange plate 10 can be provided with pouring anchor holes 11, which are used to form a concrete dowel effect at the pouring anchor holes during pouring of the concrete, so as to enhance the anchoring effect. The web plate 4 can be provided with a through hole 12, which is used for the steel rib prestressed concrete composite slab to pass through steel bars and pipelines during 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.

[0081] 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 the adjacent two design positions on the steel rib 400 is not greater than 2200 mm.

[0082] The length of the concrete block 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, the value is 60 mm. And the height of the concrete block 1 can be determined according to the design, for example, the height can be adjusted according to the total height of the composite slab to adapt to different production requirements of the steel rib prestressed concrete composite slab, but should not be less than 95 mm, for example, the value is 105 mm. The bottom of the concrete block 1 can be chamfered and slotted to avoid conflict between the concrete block 1 and the prestressed steel bars 5 of the prestressed concrete bottom plate 100.

[0083] In the present application, the concrete block 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 concrete block 1 is adhered to the adhering surface of the web plate 4 by brushing the adhesive thereon, so that the steel rib and the support block form a whole. The adhesive can be a fast-drying adhesive such as epoxy resin. When connecting the concrete block 1 under the factory production condition, the adhesive connection is preferred.

[0084] When the height of the concrete block 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 concrete block 1 and the upper flange plate 9 and the lower flange plate 10 of the steel rib 400 and adhered, so as to enhance the adhesive effect.

[0085] Alternatively, the concrete block 1 can also be fixedly connected to the web 4 of the steel rib 400 by means of a bolt 13, in which case the web 4 of the steel rib 400 is provided with a bolt hole, and the concrete block 1 is provided with a bolt hole or a sleeve 14, such as a PVC sleeve, is pre-buried therein. The bolt hole in the web 4 of the steel rib 400 can be one of the aforementioned through holes 12. When the concrete block 1 is connected on site, it is preferably connected by means of a bolt.

[0086] The steel rib 400 of one upper structure can be one or a plurality of steel ribs 400. When each upper structure comprises a plurality of steel ribs 400, the plurality of steel ribs 400 are arranged in parallel at intervals from each other, and the concrete block 1 is fixed to the web of the outermost steel rib.

[0087] The above describes the preferred embodiments of the present application. It should be noted that, for those skilled in the art, a number of improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered within the 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 concrete block, in which an upper support leg and a lower support leg are pre-embedded. The upper support leg and the lower support leg extend vertically upward and downward through the top and bottom surfaces of the concrete block, respectively. The concrete blocks of the two support blocks are fixed on both sides of the designed positions of the web of the steel rib, with a set distance between adjacent designed positions. The upper support leg and the lower support leg are respectively cast in the upper concrete flange and the prestressed concrete base plate. The top surface of the upper support leg and the bottom surface of the lower support leg are 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, fix the concrete blocks of the two support blocks 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 leg 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 leg 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 integral 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 concrete block is a solid rectangular concrete structure with vertical steel bars or plastic rods embedded inside. The upper and lower parts of the steel bars or plastic rods extend vertically upwards and downwards through the top and bottom surfaces of the concrete block, respectively, forming the upper support leg and the lower support leg.

3. 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 lower support leg and the upper support leg are respectively staggered from the prestressed steel bars and the longitudinal steel bars, and 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 transverse 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.

4. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 3, characterized in that, The top and bottom ends of the web are respectively provided with an upper flange plate and a lower flange plate. The height of the concrete block is not greater than the net height of the web plate. The upper support leg and the lower support leg are respectively located on the outside of the upper flange plate and the lower flange plate.

5. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 4, characterized in that, The cross-section of the steel rib is Z-shaped, C-shaped, or H-shaped.

6. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 4, characterized in that, The upper and lower flange plates are provided with casting anchoring holes, and the web plate is provided with through holes.

7. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 4, 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 concrete block is not less than 100mm in length, not more than 1 / 2 of the upper flange of the concrete, and not less than 95mm in height. The bottom of the concrete block is provided with a chamfer and a groove.

8. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 2, characterized in that, Each support block has two upper support legs and two lower support legs.

9. The method for preparing a steel-ribbed prestressed concrete composite slab according to any one of claims 1-8, characterized in that, The concrete block is bonded and fixed to the side of the web of the steel rib using an adhesive. Alternatively, bolt holes are provided on the web of the steel rib, and bolt holes are provided on the concrete block or a sleeve is pre-embedded therein. The concrete block is fixedly connected to the steel rib by bolts.

10. The method for preparing a steel-ribbed prestressed concrete composite slab according to claim 9, characterized in that, Each superstructure includes multiple steel ribs, which are spaced apart and arranged in parallel. The concrete block is fixed to the web of the outermost steel rib.

11. 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 steel-ribbed prestressed concrete composite slab according to any one of claims 1-10; 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 leg. 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 lifting device 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 leg 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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