Composite prefabricated laminated slab

Abstract

The utility model discloses a composite prefabricated laminated slab which comprises a first prefabricated bottom plate (1), fixing pieces (4), stressed steel bars (5), truss ribs (6) and embedded bottom ribs (7). Wherein the first prefabricated bottom plate (1) is a square prefabricated part, a plurality of open holes are formed in the first prefabricated bottom plate (1), and each open hole is used for arranging a fixing part (4); the load-bearing steel bars (5) and the truss ribs (6) are fixed on the surface of the first prefabricated bottom plate (1) at intervals; the pre-embedded bottom bars (7) are arranged above the load-bearing steel bars (5) and the truss bars (6), and the pre-embedded bottom bars (7) are fixedly connected with the first prefabricated bottom plate (1) through the fixing pieces (4). The problems that in the prior art, the material cost is high, a prefabricated slab is prone to cracking, the dead weight is large, and the clearance is low are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of precast composite slabs, and particularly relates to a composite precast slab. Background Art

[0002] As a finished precast slab used as a permanent formwork, although it can reduce the use of temporary formworks such as wooden formworks and save disposable materials, some deficiencies are also exposed in practical applications. On the one hand, the weight of the precast slab itself will significantly increase the total load of the building, thereby reducing the available clear height. For some building occasions with high requirements for clear height (such as shopping malls, exhibition halls, etc.), the application of precast slabs is limited to a certain extent. On the other hand, in order to control the precast cost, the precast slab often adopts a relatively thin concrete thickness, and the strength and quality parameters cannot be fully controlled, which may lead to frequent quality problems such as cracking, deformation, and spalling, seriously affecting the durability and safety of the structure.

[0003] In addition to the above problems affecting the use performance, there are also some unsatisfactory aspects in the process arrangement during the construction of precast slabs. It is necessary to vertically arrange truss reinforcement members on the on-site precast slab, but the working environment of this construction process is relatively narrow, the operation is complex and the efficiency is low. In addition, the position of the reserved hole often deviates from the actual steel bar position, affecting the construction quality and bringing many troubles to the subsequent concrete pouring.

[0004] In addition, when the precast slab is used as a permanent component, the design complexity also increases greatly. For example, in projects such as bridges, in addition to the conventional stress analysis, it is also necessary to specifically design the precast slab itself and the connection nodes, supports and other structural details with other components to meet higher structural safety requirements, which increases the design workload and brings many new challenges to the construction.

[0005] Therefore, from aspects such as self-weight load, concrete thickness, construction process to structural design, there are indeed some technical problems that need to be solved urgently in the popularization and application of finished precast slabs. Summary of the Utility Model

[0006] In view of the various deficiencies existing in the above-mentioned related technologies, the purpose of this application is to provide a composite precast slab to solve the problems of high material cost, easy cracking of precast slabs, large self-weight, low clear height, etc. existing in the existing related technologies.

[0007] To achieve the above and other related objectives, the present application discloses a composite precast laminated slab, comprising: a first precast bottom slab, a fixing member, stress steel bars, truss bars, and embedded bottom bars; wherein, the first precast bottom slab is a square precast member, and a plurality of openings are provided on the first precast bottom slab, and each opening is used for arranging a fixing member; the stress steel bars and the truss bars are fixedly arranged at intervals on the surface of the first precast bottom slab; the embedded bottom bars are arranged above the stress steel bars and the truss bars, and the embedded bottom bars are fixedly connected to the first precast bottom slab through the fixing member.

[0008] According to any embodiment provided by the present application, the fixing member comprises a bolt, a first nut, and a second nut; the bolt extends into the opening from the bottom of the first precast bottom slab, the first nut is screwed into the bolt to fix the bolt and the first precast bottom slab, and the second nut is screwed into the bolt to fix the bolt and the embedded bottom bars.

[0009] According to any embodiment provided by the present application, the stress steel bars and the embedded bottom bars are perpendicularly arranged with each other in a plane.

[0010] According to any embodiment provided by the present application, both ends of the embedded bottom bars are bent upward.

[0011] According to any embodiment provided by the present application, both ends of the embedded bottom bars are not longer than the first precast bottom slab.

[0012] According to any embodiment provided by the present application, it further comprises truss ribs, and the truss ribs are arranged on the top of the truss bars.

[0013] According to any embodiment provided by the present application, it further comprises a second precast bottom slab, and the second precast bottom slab is cast on the first precast bottom slab and covers all or part of the embedded bottom bars.

[0014] According to any embodiment provided by the present application, it further comprises a cast-in-place layer; the cast-in-place layer is cast on the second precast bottom slab.

[0015] According to any embodiment provided by the present application, adjacent composite precast laminated slabs are arranged in a close-fitting manner.

[0016] According to any embodiment provided by the present application, it further comprises: lapping steel bars, and the lapping steel bars are used for connecting adjacent embedded steel bars.

[0017] According to any embodiment provided by the present application, a lifting ring structure is further included in the composite precast laminated slab; both ends of the lifting ring structure penetrate through the first precast bottom slab, the second precast bottom slab, and the cast-in-place layer in sequence from the bottom of the first precast bottom slab, and are bent in a U shape in the cast-in-place layer.

[0018] Advantages of the utility model:

[0019] (1) By using bolt assemblies to fix the embedded bottom reinforcement and the first precast floor slab, the load-bearing capacity of the composite precast laminated slab can be effectively improved, making it a structural load-bearing member. Compared with traditional finished precast slabs, this structure will not significantly increase the total load of the building, so it will not reduce the available net floor-to-ceiling height, and is suitable for building occasions with high requirements for net height, such as shopping malls, exhibition halls, etc.

[0020] (2) In the utility model, by arranging the embedded bottom reinforcement above the stress reinforcement and the truss reinforcement and fixing it to the first precast floor slab by means of fixing parts, the load-bearing capacity and overall strength of the composite precast laminated slab can be improved without increasing the thickness of the concrete. This can not only effectively control the precast cost, but also avoid quality problems such as cracking, deformation, and spalling caused by too thin concrete thickness, thus ensuring the durability and safety of the structure.

[0021] (3) During the production process, the first precast floor slab can be used as the bottom formwork for the second precast floor slab, and the second precast floor slab is cast on the basis of the first precast floor slab. Since the first precast floor slab is formed by high-pressure extrusion, its strength is higher than that of ordinary cast concrete and the quality is more controllable, so problems such as cracking and deformation of the second precast floor slab during the production process can be avoided.

[0022] (4) During the transportation process, since the first precast floor slab is made by high-pressure extrusion molding process and has high strength, problems such as cracking and deformation of thin slabs during transportation can be effectively avoided. At the same time, the arrangement of the stress reinforcement and the embedded bottom reinforcement also provides two-way support for the first precast floor slab, further reducing the risk of deformation or cracking during transportation.

[0023] (5) Adjacent composite precast laminated slabs are arranged in a close-fitting manner, and lapping steel bars are placed at the joints to connect adjacent embedded bottom reinforcements, which can solve the problems of no reinforcement and force transmission at traditional close-fitting joints and improve the overall performance of the close-fitting joints.

[0024] (6) A lifting ring structure is provided in the utility model, which can be used for hoisting operations at the construction site to avoid the risk of falling caused by insufficient hardness of the truss reinforcement or truss rib structure. At the same time, the lifting ring structure passes through the first precast floor slab, the second precast floor slab and the cast-in-place layer, increasing the overall connection of the three and improving the integrity of the entire structure. Description of the drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the accompanying drawings required for description in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0026] Figure 1 It is the cross-sectional view of the composite precast laminated slab in Embodiment 1;

[0027] Figure 2 It is the cross-sectional view of the composite precast laminated slab in Embodiment 2;

[0028] Figure 3 It is the cross-sectional view of the composite precast laminated slab in Embodiment 3;

[0029] Figure 4 It is the cross-sectional view of the splicing part of the composite precast laminated slab in Embodiment 4.

[0030] Explanation of the reference numerals in the drawings:

[0031] 1 - First precast bottom slab, 2 - Second precast bottom slab, 3 - Cast-in-place layer, 4 - Fixing piece, 41 - Bolt, 42 - First nut, 43 - Second nut, 5 - Stress steel bar, 6 - Truss bar, 61 - Truss rib, 7 - Embedded bottom steel bar, 8 - Hoisting ring structure, 9 - Lapping steel bar. Detailed implementation manners

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and defined, terms such as "installation", "setting", "connection", "coupling" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Among them, it should be noted that the first precast bottom slab described in this application can be selected from the ready-made precast bottom slabs commercially available, or the concrete slabs precast in the factory.

[0036] Exemplary embodiment

[0037] This exemplary embodiment discloses a composite precast laminated slab, including: a first precast bottom slab 1, a fixing member 4, stress bars 5, truss bars 6, and embedded bottom bars 7; among them, the first precast bottom slab 1 is a square precast member, and a plurality of openings are provided on the first precast bottom slab 1, and each opening is used to set the fixing member 4; the stress bars 5 and the truss bars 6 are fixedly spaced on the surface of the first precast bottom slab 1; the embedded bottom bars 7 are arranged above the stress bars 5 and the truss bars 6, and the embedded bottom bars 7 and the first precast bottom slab 1 are fixedly connected through the fixing member 4.

[0038] In this exemplary embodiment, the fixing member 4 includes a bolt 41, a first nut 42, and a second nut 43; the bolt 41 extends into the opening from the bottom of the first precast bottom slab 1, the first nut 42 is screwed into the bolt 41 to fix the bolt 41 and the first precast bottom slab 1, and the second nut 43 is screwed into the bolt 41 to fix the bolt 41 and the embedded bottom bars 7. The first precast bottom slab 1 is combined into a structural stress member through the bolt assembly, without increasing the structural self-weight, and can reduce the building net height.

[0039] In this exemplary embodiment, the stress bars 5 and the embedded bottom bars 7 are arranged perpendicular to each other in the plane. The stress bars 5 and the embedded bottom bars 7 support the first precast bottom slab 1 from two directions, reducing the deformation or cracking of the first precast bottom slab 1 during the handling process, and the two-way reinforcement method in which the stress bars 5 and the embedded bottom bars 7 are perpendicular to each other eliminates the need for on-site bar threading and improves the construction efficiency at the construction site.

[0040] In this exemplary embodiment, both ends of the embedded bottom bars 7 are bent upward. The upwardly bent part extends into the cast-in-place layer 3, increasing the connection strength between the first precast bottom slab 1, the second precast bottom slab 2, and the cast-in-place layer 3, and improving the integrity.

[0041] In this exemplary embodiment, both ends of the embedded bottom reinforcement 7 are not longer than the first precast floor slab 1. Since both ends of the embedded bottom reinforcement 7 do not protrude, a close-fitting connection can be adopted between the composite precast superposed slabs.

[0042] In this exemplary embodiment, it further includes a truss rib 61, and the truss rib 61 is arranged on the top of the truss reinforcement 6. The truss rib 61 can improve the overall strength of the truss reinforcement 6 and the cast-in-place layer 3.

[0043] In this exemplary embodiment, it further includes a second precast floor slab 2, and the second precast floor slab 2 is cast on the first precast floor slab 1 and covers all or part of the embedded bottom reinforcement 7.

[0044] In this exemplary embodiment, it further includes a cast-in-place layer 3; the cast-in-place layer 3 is cast on the second precast floor slab 2. The cast-in-place layer 3 is made on-site at the construction site.

[0045] In this exemplary embodiment, the adjacent composite precast superposed slabs are arranged in a close-fitting manner.

[0046] In this exemplary embodiment, it further includes: lapping steel bars 9, and the lapping steel bars 9 are used to connect the adjacent embedded bottom reinforcements 7.

[0047] In this exemplary embodiment, the composite precast superposed slab further includes a lifting ring structure 8; both ends of the lifting ring structure 8 pass through the first precast floor slab 1, the second precast floor slab 2 and the cast-in-place layer 3 in sequence from the bottom of the first precast floor slab 1 and are bent into a U shape in the cast-in-place layer 3. If the truss reinforcement 6 or / and the truss rib 61 are adopted, there is a risk of falling during the hoisting operation at the construction site due to insufficient structural hardness, so the lifting ring structure 8 is arranged on the first precast floor slab 1 for hoisting operations. Further, after the hoisting operation is completed, the lifting ring structure 8 passes through the second precast floor slab 2 and the cast-in-place layer 3 in sequence from the first precast floor slab 1, thereby increasing the integrity of the three. Specific Embodiment 1

[0049] As Figure 1 shown, this exemplary embodiment discloses a composite precast superposed slab, including: a first precast floor slab 1, a fixing member 4, a stress reinforcement 5, a truss reinforcement 6 and an embedded bottom reinforcement 7; wherein, the first precast floor slab 1 is a square precast member, and a plurality of openings are provided on the first precast floor slab 1, and each opening is used to arrange the fixing member 4; the stress reinforcement 5 and the truss reinforcement 6 are fixedly spaced on the surface of the first precast floor slab 1; the embedded bottom reinforcement 7 is arranged above the stress reinforcement 5 and the truss reinforcement 6, and the embedded bottom reinforcement 7 is fixedly connected to the first precast floor slab 1 through the fixing member 4.

[0050] Among them, the fixing member 4 includes a bolt 41, a first nut 42 and a second nut 43; the bolt 41 extends into the opening from the bottom of the first precast floor slab 1, the first nut 42 is screwed into the bolt 41 to fix the bolt 41 and the first precast floor slab 1, and the second nut 43 is screwed into the bolt 41 to fix the bolt 41 and the embedded bottom reinforcement 7. The first precast floor slab 1 is combined into a structural load-bearing member through the bolt assembly, without increasing the structural self-weight and without reducing the building net height. This embodiment only shows one implementation manner of the fixing member 4. The fixing member 4 includes but is not limited to the above bolt assembly, and also includes a fixing structure made of metal or other hard materials. For example, the first precast floor slab 1 and the second precast floor slab 2 are connected and patched by using short steel bars and steel wires for bundling.

[0051] Among them, the stress reinforcement 5 and the embedded bottom reinforcement 7 are arranged perpendicular to each other in the plane. The stress reinforcement 5 and the embedded bottom reinforcement 7 support the first precast floor slab 1 from two directions, reducing the deformation or cracking of the first precast floor slab 1 during the handling process. Moreover, the two-way reinforcement method in which the stress reinforcement 5 and the embedded bottom reinforcement 7 are perpendicular to each other eliminates the need for on-site bar threading, improving the construction efficiency at the construction site.

[0052] Among them, both ends of the embedded bottom reinforcement 7 are bent upward. The upwardly bent parts extend into the cast-in-place layer 3, increasing the connection strength between the first precast floor slab 1, the second precast floor slab 2 and the cast-in-place layer 3 and improving the integrity. Moreover, both ends of the embedded bottom reinforcement 7 are not longer than the first precast floor slab 1. Since both ends of the embedded bottom reinforcement 7 do not protrude, a close-fitting connection can be adopted between the composite precast laminated slabs.

[0053] In this embodiment, the second precast floor slab 2 is cast on the first precast floor slab 1 and covers all or part of the embedded bottom reinforcement 7. After the second precast slab is cured by casting, it is completed, and the composite precast laminated slab shown in this embodiment is obtained.

[0054] After the above composite precast laminated slab is transported to the construction site, concrete can be cast on the second precast floor slab 2 on site, and the cast-in-place layer 3 is formed after the concrete is cured. Specific Embodiment 2

[0056] As Figure 2 shown, this exemplary embodiment discloses a composite precast laminated slab, including: a first precast floor slab 1, a fixing member 4, a stress reinforcement 5, a truss reinforcement 6 and an embedded bottom reinforcement 7; among them, the first precast floor slab 1 is a square precast member, and a plurality of openings are provided on the first precast floor slab 1, and each opening is used to arrange the fixing member 4; the stress reinforcement 5 and the truss reinforcement 6 are fixedly arranged at intervals on the surface of the first precast floor slab 1; the embedded bottom reinforcement 7 is arranged above the stress reinforcement 5 and the truss reinforcement 6, and the embedded bottom reinforcement 7 is fixedly connected to the first precast floor slab 1 through the fixing member 4.

[0057] Among them, the fixing member 4 includes a bolt 41, a first nut 42 and a second nut 43; the bolt 41 extends into the opening from the bottom of the first precast floor slab 1, the first nut 42 is screwed into the bolt 41 to fix the bolt 41 and the first precast floor slab 1, and the second nut 43 is screwed into the bolt 41 to fix the bolt 41 and the embedded bottom reinforcement 7. The first precast floor slab 1 is combined into a structural load-bearing member through a bolt assembly, without increasing the structural self-weight and without reducing the building net height. This embodiment only shows one implementation manner of the fixing member 4. The fixing member 4 includes but is not limited to the above bolt assembly, and also includes a fixing structure made of metal or other hard materials. For example, the first precast floor slab 1 and the second precast floor slab 2 are connected and patched by means of bundling short steel bars and steel wires.

[0058] Among them, the stressed reinforcement 5 and the embedded bottom reinforcement 7 are arranged perpendicular to each other in the plane. The stressed reinforcement 5 and the embedded bottom reinforcement 7 support the first precast floor slab 1 from two directions, reducing the deformation or cracking of the first precast floor slab 1 during the handling process. Moreover, the two-way reinforcement method in which the stressed reinforcement 5 and the embedded bottom reinforcement 7 are perpendicular to each other eliminates the need for on-site steel bar threading, improving the construction efficiency at the construction site.

[0059] Among them, both ends of the embedded bottom reinforcement 7 are bent upward. The upwardly bent portions extend into the cast-in-place layer 3, increasing the connection strength between the first precast floor slab 1, the second precast floor slab 2 and the cast-in-place layer 3 and improving the integrity. Moreover, both ends of the embedded bottom reinforcement 7 are not longer than the first precast floor slab 1. Since both ends of the embedded bottom reinforcement 7 do not protrude, a close-fitting connection can be adopted between the composite precast laminated slabs.

[0060] In this embodiment, a truss rib 61 is further provided. The truss rib 61 is arranged on the top of the truss bar 6, and the truss rib 61 can improve the overall strength of the truss bar 6 and the cast-in-place layer 3.

[0061] In this embodiment, the second precast floor slab 2 is cast on the first precast floor slab 1 and covers all or part of the embedded bottom reinforcement 7. After the second precast slab is cast and cured, the composite precast laminated slab shown in this embodiment is completed.

[0062] After the above composite precast laminated slab is transported to the construction site, concrete can be poured onto the second precast floor slab 2 on site, and the cast-in-place layer 3 is formed after the concrete is cured. Specific Embodiment 3

[0064] As Figure 3As shown in the figure, this exemplary embodiment discloses a composite precast laminated slab, comprising: a first precast bottom slab 1, a fixing member 4, stress bars 5, truss bars 6, and embedded bottom bars 7; wherein, the first precast bottom slab 1 is a square precast member, and a plurality of openings are provided on the first precast bottom slab 1, and each opening is used to arrange the fixing member 4; the stress bars 5 and the truss bars 6 are fixedly spaced on the surface of the first precast bottom slab 1; the embedded bottom bars 7 are arranged above the stress bars 5 and the truss bars 6, and the embedded bottom bars 7 are fixedly connected to the first precast bottom slab 1 through the fixing member 4. A truss rib 61 is provided at the top of the truss bar 6, and the truss rib 61 can improve the overall strength of the truss bar 6 and the cast-in-place layer 3.

[0065] Wherein, the fixing member 4 includes a bolt 41, a first nut 42, and a second nut 43; the bolt 41 extends into the opening from the bottom of the first precast bottom slab 1, the first nut 42 is screwed into the bolt 41 to fix the bolt 41 and the first precast bottom slab 1, and the second nut 43 is screwed into the bolt 41 to fix the bolt 41 and the embedded bottom bars 7. The first precast bottom slab 1 is combined into a structural stress member through the bolt assembly, without increasing the structural self-weight and can reduce the building net height. This embodiment only shows one implementation manner of the fixing member 4. The fixing member 4 includes but is not limited to the above bolt assembly, and also includes a fixing structure made of metal or other hard materials. For example, the first precast bottom slab 1 and the second precast bottom slab 2 are connected and patched by using short steel bars and wire bundling.

[0066] Wherein, the stress bars 5 and the embedded bottom bars 7 are arranged perpendicular to each other in the plane. The stress bars 5 and the embedded bottom bars 7 support the first precast bottom slab 1 from two directions, reducing the deformation or cracking of the first precast bottom slab 1 during handling. Moreover, the two-way reinforcement method with the stress bars 5 and the embedded bottom bars 7 perpendicular to each other eliminates the need for in-situ bar threading, improving the construction efficiency on the construction site.

[0067] Wherein, both ends of the embedded bottom bars 7 are bent upward. The upwardly bent parts extend into the cast-in-place layer 3, increasing the connection strength between the first precast bottom slab 1, the second precast bottom slab 2, and the cast-in-place layer 3, and improving the integrity. Moreover, both ends of the embedded bottom bars 7 are not longer than the first precast bottom slab 1. Since both ends of the embedded bottom bars 7 do not protrude, the composite precast laminated slabs are allowed to be connected in a close-fitting manner.

[0068] In this embodiment, a lifting ring structure 8 is further provided; both ends of the lifting ring structure 8 penetrate through the first precast floor slab 1, the second precast floor slab 2 and the cast-in-place layer 3 in sequence from the bottom of the first precast floor slab 1, and are bent in a U shape within the cast-in-place layer 3. If the truss bars 6 or / and truss ribs 61 are adopted, there is a risk of dropping during the hoisting operation at the construction site due to insufficient structural hardness. Therefore, the lifting ring structure 8 is provided on the first precast floor slab 1 for hoisting operations. Further, after the hoisting operation is completed, the lifting ring structure 8 passes through the second precast floor slab 2 and the cast-in-place layer 3 in sequence from the first precast floor slab 1, thereby enhancing the integrity of the three components.

[0069] In this embodiment, the second precast floor slab 2 is cast on the first precast floor slab 1 and covers all or part of the embedded bottom reinforcement 7. After the second precast slab is cast and cured, the composite precast and laminated slab shown in this embodiment is completed.

[0070] After the above-mentioned composite precast and laminated slab is transported to the construction site, concrete can be cast on the second precast floor slab 2 on site, and the cast-in-place layer 3 is formed after the concrete is cured.

[0071] Embodiment 4

[0072] As Figure 4 shown, in this embodiment, multiple composite precast and laminated slabs are arranged adjacent to each other and spliced. The adjacent composite precast and laminated slabs are sequentially connected in a close splicing manner, with only small splicing seams left in the middle. Multiple lapping bars 9 are placed between the adjacent embedded bottom reinforcements 7, and the lapping bars 9 are connected to the adjacent embedded bottom reinforcements 7 by bundling or other means. After the lapping bars 9 are set, concrete is cast on the second precast floor slab 2 to form the cast-in-place layer 3.

[0073] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A composite precast laminated slab, characterized in that, Including: A first precast bottom slab (1), a fixing member (4), stress-bearing steel bars (5), truss bars (6), and embedded bottom steel bars (7); wherein, the first precast bottom slab (1) is a square precast member, and a plurality of openings are provided on the first precast bottom slab (1), and each opening is used for arranging the fixing member (4); the stress-bearing steel bars (5) and the truss bars (6) are fixedly spaced on the surface of the first precast bottom slab (1); the embedded bottom steel bars (7) are arranged above the stress-bearing steel bars (5) and the truss bars (6), and the embedded bottom steel bars (7) are fixedly connected to the first precast bottom slab (1) through the fixing member (4).

2. The composite precast and superposed slab according to claim 1, wherein The fixing member (4) includes a bolt (41), a first nut (42), and a second nut (43); the bolt (41) extends into the opening from the bottom of the first precast bottom slab (1), and the first nut (42) is screwed into the bolt (41) to fix the bolt (41) and the first precast bottom slab (1), and the second nut (43) is screwed into the bolt (41) to fix the bolt (41) and the embedded bottom steel bars (7).

3. The composite precast and superposed slab according to claim 1, wherein The stress-bearing steel bars (5) and the embedded bottom steel bars (7) are arranged perpendicular to each other in a plane.

4. The composite precast laminated slab according to claim 1, wherein Both ends of the embedded bottom steel bars (7) are bent upward.

5. The composite precast and superposed slab according to claim 1, characterized in that Both ends of the embedded bottom steel bars (7) are not longer than the first precast bottom slab (1).

6. The composite precast and superposed slab according to claim 1, wherein, It further includes truss ribs (61), and the truss ribs (61) are arranged on the top of the truss bars (6).

7. The composite precast and superposed slab according to any one of claims 1 to 6, characterized in that, It further includes a second precast bottom slab (2), and the second precast bottom slab (2) is cast on the first precast bottom slab (1) and covers all or part of the embedded bottom steel bars (7).

8. The composite precast and superposed slab according to claim 7, wherein, It further includes a cast-in-place layer (3); the cast-in-place layer (3) is cast on the second precast bottom slab (2).

9. The composite precast laminated slab according to claim 8, wherein, Adjacent composite precast and laminated slabs are arranged in a closely-fitted manner; the composite precast and laminated slab further includes lapping steel bars (9), and the lapping steel bars (9) are used to connect adjacent embedded bottom steel bars (7).

10. The composite precast laminated slab according to claim 8, wherein, The composite precast and laminated slab further includes a lifting ring structure (8); both ends of the lifting ring structure (8) sequentially penetrate through the first precast bottom slab (1), the second precast bottom slab (2), and the cast-in-place layer (3) from the bottom of the first precast bottom slab (1), and are bent in a U shape within the cast-in-place layer (3).

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