Prestressed laminated slab and fabricated building

Abstract

The utility model relates to a prestressed laminated slab and a fabricated building. The prestressed laminated slab comprises a laminated slab main body which has a first direction and a second direction which are perpendicular to each other; the multiple supporting mechanisms are arranged below the laminated slab body at intervals in the second direction, and the length extending direction of the supporting mechanisms is consistent with the first direction; and each supporting mechanism is assembled and connected with the laminated slab main body through at least one connecting piece. The detachable supporting mechanism is arranged at the bottom of the laminated slab main body through the connecting piece to replace ribs above the ribbed prestressed laminated slab main body, so that the prestressed laminated slab is not interfered by the ribs during site construction, and insertion construction of electromechanical pipelines on site is greatly facilitated. In addition, after the floor slab is formed, the connecting piece can reinforce connection between the overlapped part and the cast-in-place part of the floor slab, so that the floor slab forms a more stable whole, and the bearing capacity and the anti-cracking and anti-seepage capacity are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated buildings, and in particular to a prestressed composite slab and prefabricated building. BACKGROUND

[0002] ‌The ribbed prestressed composite slab is a kind of assembled monolithic floor slab combining prefabricated prestressed concrete bottom plate and cast-in-place reinforced concrete layer. This kind of floor slab is composed of prefabricated prestressed concrete ribbed bottom plate produced by pretensioning process and cast-in-place reinforced concrete layer, and has single-rib or multi-rib structure, and the rib is usually in the form of rectangle, T shape or wedge shape. The design principle and calculation method of the ribbed prestressed composite slab are mainly based on improving the stiffness and bearing capacity of the floor slab. By setting rectangular or T-shaped ribs on the bottom plate, the contact area of new and old concrete is increased, and the "dowel effect" formed by the ribs and the post-poured concrete in the reserved holes can increase the mechanical engagement force, thereby improving the shear performance of the composite surface. The ribbed prestressed composite slab has the advantages of light and thin structure, large unsupported span, anti-cracking and anti-seepage, cost saving, etc., and is applied to the production and construction of prefabricated buildings.

[0003] However, there are still several problems in the actual application of the ribbed prestressed composite slab, which hinders its large-area promotion and application: first, due to the existence of the ribs, it is difficult to lay mechanical and electrical pipelines on site. The existing technology generally leaves a space on the ribs for the pipelines to pass through, but due to the thickness of the floor slab and the shear and compression requirements of the ribs, the space is too small to realize the crossing of multiple pipelines; second, the connection between the ribs and the bottom plate is usually achieved by secondary pouring, which not only has a complex process but also has a high risk of separation during transportation and construction; third, the bearing capacity of the ribbed composite slab perpendicular to the ribs is poor, and when the size perpendicular to the ribs is large, cracks in the direction of the ribs are easy to occur, and the existence of the ribs makes it difficult to reinforce the ribbed composite slab perpendicular to the rib direction, thereby limiting the application of the ribbed composite slab in the field of concrete houses. CONTENT OF THE UTILITY MODEL

[0004] Therefore, it is necessary to provide a prestressed composite slab and prefabricated building to solve the problems of difficulty in laying mechanical and electrical pipelines on site, poor structural strength and risk of cracks.

[0005] The first aspect of the present application provides a prestressed composite slab, which comprises:

[0006] a composite slab body, the composite slab body having a first direction and a second direction perpendicular to each other;

[0007] a plurality of support mechanisms, the plurality of support mechanisms being arranged below the composite slab body along the second direction, and the length extension direction of the support mechanisms being consistent with the first direction; and

[0008] A plurality of connecting members, each of the support mechanisms being assembled and connected with the composite slab body through at least one of the connecting members.

[0009] The prestressed composite slab of the present application is assembled and connected with the support mechanism and the composite slab body through the connecting member, so that the composite slab body and the support mechanism are combined into a whole before the floor forming, and the performance advantages of the prestressed structure and the steel structure are fully utilized. The support mechanism can resist the arch deformation of the prestressed concrete, enhance the longitudinal stiffness of the prestressed composite slab, improve the support-free span of the prestressed composite slab, replace the rib of the traditional ribbed prestressed composite slab, facilitate the on-site mechanical and electrical pipeline construction, save the construction time and cost, and replace the rib production of the prestressed composite slab by using the reusable support mechanism, thereby reducing the manufacturing cost of the component. The connecting member is arranged with the detachable support mechanism at the bottom of the composite slab body to replace the rib above the composite slab body, so that the prestressed composite slab of the present application is not interfered by the rib during the on-site construction, greatly facilitates the on-site construction of the mechanical and electrical pipeline, and the connecting member can strengthen the connection between the composite part and the cast-in-place part of the floor after the floor forming, so that the floor forms a more stable whole, and the bearing capacity and the crack resistance and leakage resistance are improved.

[0010] The technical solutions of the present application are further described as follows:

[0011] In one of the embodiments, the composite slab body comprises a concrete bottom plate and a crack-resistant mesh, the crack-resistant mesh is arranged on the bottom surface of the concrete bottom plate, and the crack-resistant mesh is laid along the second direction of the composite slab body;

[0012] The crack-resistant mesh is laid on the bottom surface of the concrete bottom plate; or the crack-resistant mesh comprises a plurality of strip-shaped mesh units, the plurality of strip-shaped mesh units are laid in intervals along the second direction, and the width of the adjacent two strip-shaped mesh units is not greater than the width of the single strip-shaped mesh unit.

[0013] In one of the embodiments, the composite slab body further comprises a plurality of prestressed tendons, the plurality of prestressed tendons are arranged in intervals and side by side on the concrete bottom plate along the second direction, each of the prestressed tendons is arranged in extension along the first direction, and the end of the prestressed tendon extends to the outside of the first direction side of the concrete bottom plate by a preset length.

[0014] In one of the embodiments, the composite slab body further comprises a distribution tendon, the distribution tendon is arranged above the prestressed tendon, the extension direction of the distribution tendon is perpendicular to the extension direction of the prestressed tendon, and the distribution tendon is connected with the prestressed tendon by binding.

[0015] In one of the embodiments, the laminated slab body further comprises truss bars, the truss bars are arranged above and perpendicular to the prestressed bars, and the truss bars are connected to the prestressed bars by binding;

[0016] The truss bars comprise first truss bars and second truss bars, the first truss bars are arranged along the second direction, and the length of the first truss bars is equal to the width of the concrete bottom plate; the second truss bars are arranged along the second direction, and the length of the second truss bars is less than the width of the concrete bottom plate.

[0017] In one of the embodiments, the support mechanism further comprises a support member and a wing plate, the length extension direction of the support member is consistent with the first direction, the support member comprises a support plate, a first connecting plate and a second connecting plate, the first connecting plate and the second connecting plate are respectively connected to opposite sides of the width direction of the support plate, so that the first connecting plate, the support plate and the second connecting plate cooperatively form a receiving groove, the wing plate is arranged in the receiving groove, and adjacent three sides of the wing plate are respectively connected and fixed to the corresponding first connecting plate, support plate and second connecting plate, and the connecting member is arranged through the first connecting plate to connect the support mechanism and the laminated slab body.

[0018] In one of the embodiments, the first connecting plate is provided with a through hole, the connecting member comprises a screw rod and a nut, the screw rod is arranged through the through hole, the part of the screw rod passing through the through hole connects the support mechanism and the laminated slab, and the part of the screw rod remaining in the receiving groove is screwed with the nut.

[0019] In one of the embodiments, the first connecting plate is further provided with a polygonal groove concentrically arranged with the through hole, the diameter of the inscribed circle of the polygonal groove is greater than the diameter of the through hole, the connecting member further comprises a limiting magnetic block and an adsorbing magnetic sheet, the adsorbing magnetic sheet is fixedly arranged on the end face of the nut, the limiting magnetic block is detachably sleeved on the outside of the nut and the adsorbing magnetic sheet, the outer periphery of the limiting magnetic block is provided with a polygonal structure, and the polygonal structure is adaptively fitted into the polygonal groove;

[0020] The connecting member further comprises a gasket, the screw rod comprises an upper reinforcing segment, a variable cross-section segment and a lower threaded segment which are connected in sequence, the upper reinforcing segment connects the support mechanism and the laminated slab body, the gasket is sleeved on the lower threaded segment and abuts between the variable cross-section segment and the anti-cracking net, and the nut, the adsorbing magnetic sheet and the limiting magnetic block are arranged on the outside of the lower threaded segment.

[0021] In one of the embodiments, the connecting piece further comprises a reinforcing rib set, the reinforcing rib set comprising a first reinforcing rib and a second reinforcing rib arranged side by side and spaced apart, and a binding member for binding and fixing the first reinforcing rib and the second reinforcing rib, the variable cross-section section being clamped between the first reinforcing rib and the second reinforcing rib, and the first reinforcing rib and the second reinforcing rib being bound and connected with the prestressed tendon.

[0022] The second aspect of the present application further provides a prefabricated building comprising the prestressed composite slab as described above. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and are used to interpret the present application together with the description of the illustrative embodiments of the present application. The accompanying drawings are not intended to limit the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 The structural schematic diagram of the prestressed composite slab according to one embodiment of the present application.

[0026] Figure 2 The structural schematic diagram of the internal structure of the prestressed composite slab.

[0027] Figure 3 The structural schematic diagram of the side view of the prestressed composite slab.

[0028] Figure 4 The structural schematic diagram of Figure 3 The local enlarged structural schematic diagram of A in FIG.

[0029] Figure 5 The structural schematic diagram of the supporting mechanism according to one embodiment.

[0030] Figure 6 The structural schematic diagram of Figure 5 The structural schematic diagram of another view of FIG.

[0031] Figure 7 The sectional view of the through hole and the polygonal recessed portion of the supporting mechanism.

[0032] Figure 8 The structural schematic diagram of the connecting piece according to one embodiment.

[0033] Figure 9 The structural schematic diagram of Figure 8 The structural schematic diagram of the screw rod in FIG.

[0034] Figure 10 For Figure 8 The assembling structure diagram of the middle nut, the limiting magnetic block and the adsorbing magnetic sheet.

[0035] Explanation of reference signs:

[0036] 100, prestressed composite slab; 10, composite slab body; 11, concrete bottom plate; 12, anti-cracking net; 13, prestressed tendon; 14, distribution tendon; 15, truss tendon; 15a, first truss tendon; 15b, second truss tendon; 20, supporting mechanism; 21, supporting member; 211, supporting plate; 212, first connecting plate; 212a, through hole; 212b, polygonal groove; 213, second connecting plate; 22, wing plate; 30, connecting piece; 31, screw rod; 311, upper reinforcing bar section; 312, variable cross-section section; 313, lower threaded section; 32, nut; 33, limiting magnetic block; 34, adsorbing magnetic sheet; 35, gasket; 36, reinforcing bar group; 361, first reinforcing bar; 362, second reinforcing bar; 363, binding member. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more apparent and understandable, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or identifying the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0040] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0042] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0043] Reference Figures 1 to 3 A prestressed composite slab 100 according to an embodiment of the present application includes a composite slab body 10, a plurality of support mechanisms 20, and a plurality of connecting members 30.

[0044] The laminated slab body 10 is a main structure of the prestressed laminated slab 100. In this application, the laminated slab body 10 is in a rectangular structure. That is, the laminated slab body 10 has a first direction and a second direction perpendicular to each other.

[0045] It is easy to understand that when the first direction refers to the length direction of the laminated slab body 10, the second direction is the width direction of the laminated slab body 10; or when the first direction refers to the width direction of the laminated slab body 10, the second direction is the length direction of the laminated slab body 10.

[0046] Specifically, in this application, the first direction refers to the length direction of the laminated slab body 10, that is, the Y-axis direction in Figure 1 ; and the second direction refers to the width direction of the laminated slab body 10, that is, the X-axis direction in Figure 1 .

[0047] A plurality of support mechanisms 20 are arranged under the laminated slab body 10 along the second direction, and the length extension direction of the support mechanism 20 is consistent with the first direction; each support mechanism 20 is assembled and connected with the laminated slab body 10 through at least one connecting piece 30.

[0048] In summary, the prestressed laminated slab 100 of the present application can be combined into a whole with the support mechanism 20 and the laminated slab body 10 before the floor forming by assembling and connecting the support mechanism 20 and the laminated slab body 10 through the connecting piece 30, so as to fully play the performance advantages of the prestressed structure and the steel structure. The support mechanism 20 can resist the arch deformation of the prestressed concrete, enhance the longitudinal stiffness of the prestressed laminated slab, improve the support-free span of the prestressed laminated slab, replace the rib of the traditional ribbed prestressed laminated slab, facilitate the on-site mechanical and electrical pipeline construction and save the construction time and cost, the rib production of the prestressed laminated slab is avoided by using the reusable support mechanism 20, and the manufacturing cost of the component is reduced. The rib above the laminated slab body 10 is replaced by arranging the detachable support mechanism 20 on the bottom of the laminated slab body 10 through the connecting piece 30, so that the prestressed laminated slab of the present application is not interfered by the rib during the on-site construction, and the on-site mechanical and electrical pipeline construction is greatly facilitated. In addition, the connecting piece 30 can strengthen the connection between the laminated part and the cast-in-place part of the floor after the floor forming, so as to form a more stable whole, improve the bearing capacity and crack resistance and leakage resistance.

[0049] Please continue to refer to FIGS. Figure 1 , Figure 2 and Figure 4 In an optional embodiment, the laminated slab body 10 includes a concrete bottom plate 11 and a crack-resistant net 12, the crack-resistant net 12 is arranged on the bottom surface of the concrete bottom plate 11, and the crack-resistant net 12 is laid along the second direction of the laminated slab body 10.

[0050] Concrete can be, but is not limited to, ordinary fine aggregate concrete, with a strength grade of no less than C40 and a maximum coarse aggregate particle size of no more than 10 mm. Other requirements are the same as for ordinary concrete. The casting thickness of the concrete base plate 11 should be determined according to the design. Considering structural requirements and economic benefits, its thickness is preferably 35 mm to 45 mm.

[0051] The anti-crack mesh 12 is placed on the bottom surface of the concrete base plate 11 (i.e., the composite slab body 10). The anti-crack mesh 12 is typically made of a non-metallic mesh material. Preferred materials include alkali-resistant fiberglass mesh, geogrid, or carbon fiber mesh. The mesh size of the mesh or grid is preferably no larger than 20 cm x 20 cm.

[0052] The anti-cracking net 12 should be laid along the short side direction (ie the second direction or width direction) of the composite board body 10. The anti-cracking net 12 can enhance the anti-cracking and anti-seepage ability of the composite board after construction and enhance the transverse bending resistance of the ultra-wide composite board.

[0053] However, it is necessary to point out that the anti-cracking net 12 is not necessarily required to be arranged on all the composite board bodies 10. The anti-cracking net 12 is generally arranged only when the width of the composite board body 10 is greater than 2.4 meters.

[0054] The anti-crack mesh 12 can be laid in various ways depending on actual needs. For example, in one embodiment, the anti-crack mesh 12 is laid entirely on the bottom surface of the concrete base plate 11. Covering the entire bottom surface of the concrete base plate 11 with the anti-crack mesh 12 helps achieve better crack resistance, anti-seepage capabilities, and lateral bending resistance.

[0055] Alternatively, in another embodiment, the anti-crack mesh 12 comprises a plurality of strip mesh units, which are spaced apart along the second direction, with the width of two adjacent strip mesh units no greater than the width of a single strip mesh unit. This arrangement can save consumables for the anti-crack mesh 12 while still meeting the required crack resistance, anti-seepage, and lateral bending resistance, thereby reducing construction costs and the time required for on-site construction steps, and improving the construction efficiency of the prestressed composite slab 100.

[0056] Please continue reading Figure 1 , Figure 2 and Figure 4Further, the composite slab body 10 further comprises a plurality of prestressed steel bars 13, which are arranged in parallel along the second direction on the concrete bottom plate 11, each of the plurality of prestressed steel bars 13 extends along the first direction, and the end of the prestressed steel bar 13 extends to the outside of the concrete bottom plate 11 by a predetermined length in the first direction. The prestressed steel bar 13 is an important component of the composite slab body 10 and is the main force structure of the prestressed composite slab 100. The prestressed steel bar 13 can cooperate with the concrete bottom plate 11 to apply prestress to the composite slab body 10 to enhance the crack resistance of the composite slab body 10 and increase the unsupported span of the prestressed composite slab 100.

[0057] In the present application, the diameter of the prestressed steel bar 13 is 3mm-7mm, and the specific diameter is determined by the designer according to the specific project. The prestressed steel bar 13 is a common prestressed steel wire in the market, and the tensile strength is preferably 1570MPa or more. The prestressed steel bar 13 is arranged at the bottom of the composite slab body 10, and the clear distance from the bottom surface of the composite slab body 10 is the thickness of the protective layer of the prestressed steel bar 13, which is generally not less than 20mm. The spacing of the prestressed steel bar 13 is determined by the design, and generally should meet the modulus of 50mm.

[0058] Please continue to refer to Figure 2 and Figure 4 Further, the composite slab body 10 further comprises a plurality of prestressed steel bars 13, which are arranged in parallel along the second direction on the concrete bottom plate 11, each of the plurality of prestressed steel bars 13 extends along the first direction, and the end of the prestressed steel bar 13 extends to the outside of the concrete bottom plate 11 by a predetermined length in the first direction. The prestressed steel bar 13 is an important component of the composite slab body 10 and is the main force structure of the prestressed composite slab 100. The prestressed steel bar 13 can cooperate with the concrete bottom plate 11 to apply prestress to the composite slab body 10 to enhance the crack resistance of the composite slab body 10 and increase the unsupported span of the prestressed composite slab 100.

[0059] The prestressed steel bar 13 is an important component of the composite slab body 10 and is the main force structure of the prestressed composite slab 100. The prestressed steel bar 13 can cooperate with the concrete bottom plate 11 to apply prestress to the composite slab body 10 to enhance the crack resistance of the composite slab body 10 and increase the unsupported span of the prestressed composite slab 100.

[0060] It should be noted that generally the distribution steel bar 14 does not protrude, but when the prestressed composite slab 100 is designed as a two-way slab, the stress steel bar should be arranged in the direction perpendicular to the prestressed steel bar 13 according to the design drawing requirements. At this time, the stress steel bar should be regarded as equivalent to the distribution steel bar 14, and the distribution steel bar 14 does not need to be repeatedly arranged.

[0061] Please continue to refer to Figure 1 , Figure 2 and Figure 4In addition, on the basis of any of the above embodiments, the composite slab body 10 further comprises a truss rib 15, which is arranged above the prestressed rib 13 and is arranged perpendicularly to the prestressed rib 13, and the truss rib 15 is tied and connected with the prestressed rib 13. The truss rib 15 adopts a common steel bar truss, the size of the truss rib 15 is selected according to the relevant standard atlas and the thickness of the slab, the truss rib 15 is arranged in a direction perpendicular to the prestressed rib 13, the edge distance and the net distance of the truss rib 15 should be determined according to the calculation simulation and test verification, and generally the edge distance is not greater than 600 mm and the net distance is not greater than 2400 mm. The arrangement of the truss rib 15 can significantly improve the rigidity and transverse bending resistance of the composite slab body 10.

[0062] Specifically, the truss rib 15 in the embodiment comprises a first truss rib 15a and a second truss rib 15b. The first truss rib 15a is arranged to extend along the second direction, and the length of the first truss rib 15a is equal to the width of the concrete bottom plate 11 (in actual use, the length of the first truss rib 15a is generally slightly smaller than the width of the concrete bottom plate 11). The second truss rib 15b is arranged to extend along the second direction, and the length of the second truss rib 15b is less than the width of the concrete bottom plate 11.

[0063] The first truss rib 15a is arranged to improve the transverse rigidity of the prestressed composite slab 100, enhance the transverse bending resistance of the prestressed composite slab 100, reduce the cracking risk of the prestressed composite slab 100 during transportation and hoisting, strengthen the connection between the prestressed composite slab 100 and the cast-in-place layer, improve the integrity of the slab, and serve as a lifting point for hoisting the composite slab when erecting the steel mesh on site. The length of the second truss rib 15b is generally not more than 600 mm, which serves as a lifting point for hoisting the prestressed composite slab 100, and is more economical and convenient to produce and construct than embedded parts.

[0064] It should be noted that if the first truss rib 15a is cut off or truncated after the installation and support of the prestressed composite slab 100 are completed, it can be cut off or truncated if it interferes with the on-site construction.

[0065] In this application, the support mechanism 20 is a kind of reusable functional component for enhancing the rigidity of the prestressed composite slab 100 and resisting the arch deformation of the prestressed concrete.

[0066] Please continue to refer to Figures 5 to 7In an alternative embodiment, the support mechanism 20 further comprises a support member 21 and a wing plate 22, the support member 21 has a length extending direction consistent with the first direction, the support member 21 comprises a support plate 211, a first connecting plate 212 and a second connecting plate 213, the first connecting plate 212 and the second connecting plate 213 are respectively connected to opposite sides of the support plate 211 in the width direction, so that the first connecting plate 212, the support plate 211 and the second connecting plate 213 cooperate to form a receiving groove, the wing plate 22 is arranged in the receiving groove, and the adjacent three sides of the wing plate 22 are respectively connected and fixed with the corresponding first connecting plate 212, support plate 211 and second connecting plate 213, and the connecting piece 30 is arranged in the first connecting plate 212 to connect the support mechanism 20 and the laminated slab body 10.

[0067] It can be understood that the support member 21 adopts a slotted strip steel member with a U-shaped or C-shaped cross section, which is simple in structure, easy to obtain and high in structural strength. The wing plate 22 is installed in the receiving groove, and the wing plate 22 forms a support and reinforcement to the outer peripheral first connecting plate 212, support plate 211 and second connecting plate 213, so as to further strengthen the rigidity and strength of the support member 21.

[0068] As shown in Figure 7 It should be noted that the length of the support member 21 matches the length of the laminated slab body 10 (generally slightly shorter than the laminated slab body 10), the inner width b of the support member 21 is preferably 60mm-120mm, and the outer width B of the support member 21 is preferably less than 150mm; the thickness t of the support member 21 is preferably 3mm-10mm, the height H of the support member 21 is 80mm-260mm, and the thickness and height of the support member 21 should be determined according to the calculation of the laminated slab support span and deformation requirements. In theory, the larger the span, the greater the thickness and height.

[0069] On the basis of the above embodiment, the first connecting plate 212 is provided with a through hole 212a, the connecting piece 30 comprises a screw rod 31 and a nut 32, the screw rod 31 is arranged in the through hole 212a, the part of the screw rod 31 passing through the through hole 212a connects the support mechanism 20 and the laminated slab, and the part of the screw rod 31 remaining in the receiving groove is screwed with the nut 32. The threaded connection is convenient and labor-saving for installation and disassembly, has high connection strength, and is beneficial to the repeated use of the support mechanism 20 without affecting the use performance and reliability.

[0070] Further, the first connecting plate 212 is further provided with a polygonal recess 212b concentrically arranged with the through hole 212a, an inscribed circle of the polygonal recess 212b has a diameter greater than that of the through hole 212a, the connecting piece 30 further comprises a limiting magnetic block 33 and an adsorbing magnetic sheet 34, the adsorbing magnetic sheet 34 is fixedly arranged on an end surface of the nut 32, the limiting magnetic block 33 is detachably sleeved on the outside of the nut 32 and the adsorbing magnetic sheet 34, an outer periphery of the limiting magnetic block 33 is provided with a polygonal structure, the polygonal structure is adapted to be embedded in the polygonal recess 212b. When the nut 32 and the screw rod 31 are tightly assembled, the limiting magnetic block 33 is inserted into the polygonal recess 212b, and the limiting magnetic block 33 is limited by the plurality of matching surfaces, so that the assembled nut 32 cannot be rotated, thereby achieving the locking and anti-loosening effect, and improving the stability of the overall structure of the supporting mechanism 20.

[0071] The limiting magnetic block 33 and the adsorbing magnetic sheet 34 have self-adsorption ability due to the magnetic attraction, so as to be adsorbed and fixed with the supporting member 21 and not easy to fall off.

[0072] Please continue to refer to Figures 8 to 10 The connecting piece 30 further comprises a gasket 35, the screw rod 31 comprises an upper reinforcing section 311, a variable cross-section section 312 and a lower threaded section 313 connected in sequence, the upper reinforcing section 311 connects the supporting mechanism 20 and the laminated slab body 10, the gasket 35 is sleeved on the lower threaded section 313 and abuts between the variable cross-section section 312 and the anti-cracking net 12, and the nut 32, the adsorbing magnetic sheet 34 and the limiting magnetic block 33 are arranged on the outside of the lower threaded section 313. The upper reinforcing section 311 is used to connect the laminated slab body 10 and the supporting mechanism 20, the variable cross-section section 312 is used to press the gasket 35 on the anti-cracking net 12, thereby achieving the positioning and anti-crushing effect, and the lower threaded section 313 is used to be screwed with the nut 32, thereby achieving the installation of the connecting piece 30.

[0073] It should be noted that the upper steel segment 311 is a hot-rolled ribbed steel bar without processing, and the diameter of the steel bar is preferably one of 10 mm, 12 mm, 14 mm, 16 mm, etc., and the length of the upper steel segment 311 should match the thickness of the floor (generally 20 mm less than the total thickness of the floor); the lower threaded segment 313 is a threaded segment processed by threading, and the pitch and depth of the thread should match the conventional hexagonal nut 32, and the diameter of the threaded segment is preferably one of 6 mm, 8 mm, 10 mm, 12 mm, etc., and the diameter of the lower threaded segment 313 should be 2 mm to 4 mm less than the diameter of the upper steel segment 311, and the length of the lower threaded segment 313 is preferably 30 mm to 60 mm and not more than 1 / 2 of the height of the support member 21; the variable cross-section segment 312 is a transition segment of the variable cross-section screw rod 31 connecting the upper steel segment 311 and the lower threaded segment 313, and the variable cross-section segment 312 can be cut out by a threading machine or a steel cutting tool to form a recessed weak surface of the screw rod 31, which not only has simple production and low cost (produced by ordinary steel threading cutting), but also can well meet the functional requirements of connection and fastening and convenient disassembly in use (cooperated with the magnetic nut 32 during the production and installation of the composite slab to realize the fastening of the connecting piece 30, and the variable cross-section screw rod 31 can be easily cut off at the weak surface after the floor is formed to complete the disassembly of the support mechanism 20).

[0074] In the present application, the nut 32 is specifically a hexagonal nut 32, and the size of the nut 32 matches the size of the variable cross-section segment 312 of the screw rod 31; the limiting magnetic block 33 is a regular hexagonal magnetic block sleeved on the periphery of the hexagonal nut 32 to limit the rotation of the hexagonal nut 32, the inner hexagonal of the limiting magnetic block 33 clamps the hexagonal nut 32, and the outer hexagonal is embedded in and attracted to the hexagonal groove of the opening of the support mechanism 20, and the thickness of the limiting magnetic block 33 should be greater than the groove depth but not more than the sum of the length of the hexagonal nut 32 and the attracted magnetic sheet 34; the attracted magnetic sheet 34 is a thin sheet with the same cross-sectional shape as the hexagonal nut 32 and is magnetic, and the thickness of the attracted magnetic sheet 34 is preferably 1 mm to 3 mm, and the attracted magnetic sheet 34 and the hexagonal nut 32 are attracted together after being stacked together and are embedded in the limiting magnetic block 33 to form a magnetic nut 32 (the attracted magnetic sheet 34 and the hexagonal nut 32 can be bonded into one whole body by strong glue after being stacked together). Embedding the magnetic nut 32 with the magnetic block into the groove structure of the opening of the support mechanism 20 forms a detachable non-rotatable nut 32, which not only facilitates the installation of the connecting piece 30 by cooperating with the variable cross-section screw rod 31 during the production of the prestressed composite slab, but also facilitates the disassembly of the support mechanism 20 after the floor is formed.

[0075] Please continue to refer to Figure 8In addition, on the basis of the above-mentioned embodiments, the connecting piece 30 further comprises a reinforcing rib set 36, the reinforcing rib set 36 comprises a first reinforcing rib 361 and a second reinforcing rib 362 arranged side by side and spaced apart, and a binding piece 363 for binding and fixing the first reinforcing rib 361 and the second reinforcing rib 362, the variable cross-section section 312 is clamped between the first reinforcing rib 361 and the second reinforcing rib 362, and the first reinforcing rib 361 and the second reinforcing rib 362 are bound and connected with the prestressed tendon 13. The reinforcing rib set 36 can enhance the connecting effect of the connecting piece 30, and better combine the laminated slab main body 10 and the supporting mechanism 20 into a whole to realize better common force combination.

[0076] The middle part of the first reinforcing rib 361 and the second reinforcing rib 362 clamps the bottom of the upper reinforcing rib section 311 of the screw rod 31, and the length of the first reinforcing rib 361 and the second reinforcing rib 362 is 200mm-350mm, and the diameter is 8mm-12mm.

[0077] In addition, the application also provides a prefabricated building comprising the prestressed laminated slab 100 according to any one of the above-mentioned embodiments.

[0078] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the description.

[0079] The above-mentioned embodiments only express several embodiments of the application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent application scope. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A prestressed composite slab, characterized by, The application relates to a laminated slab body, a plurality of support mechanisms and a plurality of connecting members. The laminated slab body has a first direction and a second direction perpendicular to the first direction. The plurality of support mechanisms are arranged below the laminated slab body along the second direction, and the length extension direction of the support mechanisms is consistent with the first direction. The plurality of connecting members are used to connect the support mechanisms and the laminated slab body. The laminated slab body comprises a concrete bottom plate and a crack-resistant net arranged on the bottom surface of the concrete bottom plate.

2. The prestressed composite slab according to claim 1, characterized in that, The crack-resistant net is arranged on the bottom surface of the concrete bottom plate. The crack-resistant net comprises a plurality of strip net units arranged along the second direction.

3. The prestressed composite slab according to claim 2, characterized in that, The width of two adjacent strip net units is not greater than the width of a single strip net unit. The laminated slab body further comprises a plurality of prestressed tendons arranged above the concrete bottom plate along the second direction.

4. The prestressed composite slab according to claim 3, characterized in that, Each of the prestressed tendons is arranged along the first direction, and the end of the prestressed tendon extends to the outside of the first direction of the concrete bottom plate by a preset length. The laminated slab body further comprises a distribution tendon arranged above the prestressed tendons.

5. The prestressed composite slab as claimed in claim 3, wherein, The extension direction of the distribution tendon is perpendicular to the extension direction of the prestressed tendons.

6. The prestressed composite slab as claimed in claim 5, wherein, The distribution tendon is tied with the prestressed tendons. The laminated slab body further comprises a truss tendon arranged above the prestressed tendons and perpendicular to the prestressed tendons. The truss tendon is tied with the prestressed tendons. The truss tendon comprises a first truss tendon and a second truss tendon. The first truss tendon is arranged along the second direction, and the length of the first truss tendon is equal to the width of the concrete bottom plate. The second truss tendon is arranged along the second direction, and the length of the second truss tendon is smaller than the width of the concrete bottom plate. The support mechanism further comprises a support member and a wing plate. The length extension direction of the support member is consistent with the first direction. The support member comprises a support plate, a first connecting plate and a second connecting plate. The first connecting plate and the second connecting plate are respectively connected to the opposite sides of the width direction of the support plate. The first connecting plate, the support plate and the second connecting plate cooperatively form a receiving groove. The wing plate is arranged in the receiving groove. The adjacent three sides of the wing plate are respectively connected and fixed with the first connecting plate, the support plate and the second connecting plate. The connecting member is arranged in the first connecting plate to connect the support mechanism and the laminated slab body. The first connecting plate is provided with a through hole. The connecting member comprises a screw rod and a nut. The screw rod is arranged in the through hole. The part of the screw rod passing through the through hole connects the support mechanism and the laminated slab body. The part of the screw rod arranged in the receiving groove is screwed with the nut.

7. The prestressed composite slab as claimed in claim 6, wherein, The first connecting plate is further provided with a polygonal recess concentrically arranged with the through hole, an inscribed circle of the polygonal recess has a diameter greater than that of the through hole, the connecting piece further comprises a limiting magnetic block and an adsorbing magnetic sheet, the adsorbing magnetic sheet is fixedly arranged on an end surface of the nut, the limiting magnetic block is detachably sleeved on the outside of the nut and the adsorbing magnetic sheet, an outer periphery of the limiting magnetic block is provided with a polygonal structure, and the polygonal structure is adaptively embedded in the polygonal recess.

8. The prestressed composite slab of claim 7, wherein, The connecting piece further comprises a gasket, the screw rod comprises an upper reinforcing segment, a variable cross-section segment and a lower threaded segment connected in sequence, the upper reinforcing segment connects the supporting mechanism and the laminated slab body, the gasket is sleeved on the lower threaded segment and abuts against the variable cross-section segment and the anti-cracking net, and the nut, the adsorbing magnetic sheet and the limiting magnetic block are arranged on the outside of the lower threaded segment.

9. The prestressed composite slab of claim 8, wherein, The connecting piece further comprises a reinforcing rib group, the reinforcing rib group comprises a first reinforcing rib and a second reinforcing rib arranged side by side and spaced apart, and a binding member for binding and fixing the first reinforcing rib and the second reinforcing rib, the variable cross-section segment is clamped between the first reinforcing rib and the second reinforcing rib, and the first reinforcing rib and the second reinforcing rib are bound and connected with the prestressed tendon.

10. A building of assembled parts, characterized in that, The prestressed laminated slab comprises the prestressed laminated slab as claimed in any one of claims 1 to 8.

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