Stiffened composite beam plate, stiffened composite beam plate group, superposed beam plate structure as well as construction method and application of superposed beam plate structure

Abstract

The invention provides a stiffened composite beam plate, a stiffened composite beam plate group, a superposed beam plate structure and a construction method and application thereof, and belongs to the field of fabricated constructions.The stiffened composite beam plate comprises a stiffened rib beam and a stiffened panel, and the stiffened panel is designed into a composite structure of a prefabricated sandwich plate (a lower plate, a heat preservation and sound insulation layer, an upper plate) and a cast-in-place layer; the shear-resistant connecting keys (such as steel pipes) penetrate through the heat preservation layer and tie the upper-layer prefabricated plate and the lower-layer prefabricated plate, so that the three layers form a whole to bear force together, the rigidity and integrity of the stiffening panel are greatly improved, and deflection and crack development of the cantilever end are effectively restrained.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated buildings, and in particular relates to a stiffened composite beam-slab, a stiffened composite beam-slab assembly, a composite beam-slab structure, and its construction method and application. Background Technology

[0002] A single-T slab is a large prestressed concrete precast component, named for its T-shaped cross-section. It typically features a wide flange (stiffened panel) and a tall, narrow web (stiffening rib). Its efficient structural form allows for column-free spatial spans of 12 to 30 meters or even greater, far superior to traditional double-T slabs or hollow core slabs. The large web height provides strong bending and shear resistance. Compared to solid concrete slabs, its cross-section reduces concrete usage, resulting in a relatively lighter weight. As a large precast component, it allows for rapid on-site installation, significantly shortening the construction period.

[0003] However, in existing technologies, single-T cantilever slabs are too thin, typically only 50mm thick, making them prone to deformation and cracking, and they lack building functions such as thermal insulation and soundproofing. Therefore, this invention was developed.

[0004] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] One objective of this invention is to propose a composite beam-slab that is not prone to cracking and also has thermal insulation and sound insulation properties. The second objective of this invention is to propose a composite beam-slab assembly that is not prone to cracking and has both thermal insulation and sound insulation properties. The third objective of this invention is to propose a beam-slab structure composed of composite beams and slabs; The fourth objective of this invention is to promote the application of a composite beam-slab that is not prone to cracking and has both thermal insulation and sound insulation properties in the field of prefabricated buildings. To achieve one of the above objectives, the present invention first provides a stiffened composite beam-slab, comprising stiffening ribs and stiffening panels. The stiffening ribs are formed below the stiffening panels. The stiffening panels include at least a precast portion and a cast-in-place portion. The precast portion includes a lower slab, an upper slab, a thermal insulation and sound insulation layer, and shear-resistant connecting keys. The lower slab is integrally formed with the stiffening ribs. The thermal insulation and sound insulation layer is located between the upper slab and the lower slab. The shear-resistant connecting keys penetrate the thermal insulation and sound insulation layer and are respectively connected at both ends to the upper slab and the lower slab. The cast-in-place portion is located on the upper slab.

[0006] Preferably, the shear-resistant connecting key is a steel pipe.

[0007] Preferably, at least one of the shear connecting keys is located at the stiffening rib, and the bottom of the shear connecting key is connected to the stiffening rib.

[0008] Preferably, a plurality of shear connection keys are arranged along the beam length direction of the stiffening rib beam, the bottom of the shear connection key is connected to the stiffening rib beam reinforcement cage of the stiffening rib beam, and the structural reinforcement of the stiffening panel passes through the shear connection key.

[0009] The technical effects of the above-mentioned technical solutions of the present invention arise from one or more of the following combinations: Traditional single-T slabs have a single thin concrete panel, which lacks sufficient flexural stiffness under cantilever conditions and is prone to deformation and cracking. This solution designs the stiffened panel as a composite structure of "precast sandwich panel (lower slab + thermal and sound insulation layer + upper slab) + cast-in-place layer". Shear-resistant connecting keys (such as steel pipes) penetrate the insulation layer and connect the upper and lower precast slabs, making the three layers form a unified whole that shares the load. This significantly improves the stiffness and integrity of the stiffened panel, effectively suppressing deflection and crack development at the cantilever end. If the bottom of the shear-resistant key is connected to a stiffening rib beam, the synergistic working ability of the stiffening rib beam and the stiffened panel is further enhanced, significantly improving the performance of the cantilever slab and solving the cracking problem.

[0010] This solution embeds a thermal and acoustic insulation layer (such as polyurethane foam) within the prefabricated components, ensuring that the components possess excellent thermal and acoustic properties upon leaving the factory, thus achieving integration of structural and architectural functions. This aligns with current requirements for green building and energy-saving design.

[0011] When steel pipes are used as shear connection keys, a space for pipelines can be naturally formed inside. On the construction site, water and electricity pipelines can be pre-inserted into these steel pipes and then poured and filled together with the cast-in-place layer. This realizes the industrialization and standardization of pipeline pre-embedding, avoids the damage to the structure and construction troubles caused by traditional post-grooving, and facilitates pipeline laying and integration.

[0012] The design defines a "two-stage stress" model. During the construction phase (when only the precast components are involved), the precast sandwich panels and stiffening ribs bear the hoisting and construction loads; during the service phase (after the cast-in-place layer has hardened), the complete composite section bears the service loads. This design makes full use of the material properties, and the cast-in-place layer plays a role in overall leveling and reinforcement.

[0013] Above the stiffening rib, shear connection keys are set along the length of the rib, which connect the stiffening rib cage and the structural reinforcement of the stiffening panel, thereby increasing the effective mechanical height of the stiffening rib and greatly improving the strength of the rib.

[0014] To achieve the above two objectives, the present invention provides a stiffened composite beam-plate assembly, characterized in that it comprises multiple stiffened composite beam-plates; the stiffened composite beam-plates adjacent to each other on the side of the stiffened panel are connected by lap joints.

[0015] Preferably, a post-cast space is formed between the ends of the stiffening panels of adjacent stiffened composite beams, and the ends of the lower plates of adjacent stiffened composite beams are reinforced. The lap joint overlaps with the ends of the lower plates of adjacent beams, and a separate thermal insulation and sound insulation layer is provided in the post-cast space.

[0016] Preferably, a post-cast space is formed between the ends of the stiffening panels of adjacent stiffened composite beams, and the ends of the upper and lower plates of adjacent stiffened composite beams produce U-shaped structural reinforcements, with the lap joint overlapping the U-shaped structural reinforcements of the adjacent stiffening panels.

[0017] Preferably, the lower plate ends of adjacent stiffened composite beam slabs are closely joined, and the upper plate ends cooperate with the lower plate to form a post-cast groove, the post-cast groove being provided with a thermal insulation and sound insulation layer; the upper plate ends of adjacent stiffened composite beam slabs have reinforcing bars, and the lap joint overlaps with the end reinforcing bars of the adjacent upper plate.

[0018] Preferably, the ends of the stiffening panels of adjacent stiffened composite beams are closely joined, and the lap joint spans the joint between the ends of the stiffening panels.

[0019] The technical effects of the above-mentioned technical solutions of the present invention arise from one or more of the following combinations: A single-slab T-plate is essentially a one-way slab. By effectively connecting multiple stiffened composite beam-slabs laterally (at the ends of the stiffened panels) (through lap joints), a stiffened composite beam-slab assembly is formed, enabling loads to be transferred in both directions. This improves the structural stress performance and makes it more suitable for building scenarios requiring large spaces and large spans, achieving two-way slab force transfer in large-span spaces.

[0020] This application proposes four types of slab-side connection structures (lapped reinforcement in post-cast space, lapped ring reinforcement in post-cast space, closely spaced post-cast groove, and closely spaced cross-joint reinforcement) to adapt to different design requirements and construction conditions. These structures all emphasize ensuring the structural continuity of the connection (through lapped reinforcement) and the continuity of the building's physical performance (through the installation of an insulation layer or the pouring of lightweight concrete in the post-cast space), preventing the formation of thermal bridges and weak sound insulation links.

[0021] Reliable steel reinforcement connections between slabs enhance the overall rigidity of the floor plan, which is beneficial for the transmission and distribution of horizontal loads (such as seismic forces) and improves the overall seismic performance of prefabricated structures.

[0022] To achieve the above three objectives, the present invention provides a composite beam-slab structure, including a stiffened composite beam-slab assembly, wherein the cast-in-place portion of the stiffened composite beam-slab assembly is integrally cast onto the stiffened panel to form a cast-in-place layer.

[0023] To achieve the above three objectives, the present invention also provides a construction method for composite beam-slab structures, comprising the following steps: A precast stiffened composite beam-slab, comprising a stiffening panel and stiffening ribs, wherein the stiffening panel comprises at least a precast portion and a cast-in-place portion, the precast portion comprising a lower slab, an upper slab, a thermal insulation and sound insulation layer, and shear connecting keys, wherein the lower slab and the stiffening ribs are integrally formed, and the shear connecting keys penetrate the thermal insulation and sound insulation layer and are respectively connected at both ends to the upper slab and the lower slab; Install the stiffened composite beam plate assembly, hoist the stiffened composite beam plate onto the main structure, and connect the stiffened composite beam plates adjacent to each other on the side of the stiffened panel by lap joints; One of the precast cast-in-place components is integrally cast onto the stiffened panel to form a cast-in-place layer.

[0024] Preferably, when installing the stiffened composite beam and slab assembly, a post-cast space is formed between the ends of the stiffened panels of adjacent stiffened composite beam and slabs, the lap joint is implemented as a lap bar, the end of the lower slab of the adjacent stiffened composite beam and slab is reinforced, and the lap bar is lapped to the end of the end of the lower slab of the adjacent stiffened composite beam and slab. A separate thermal insulation and sound insulation layer is provided in the post-cast space. When casting a precast portion, fill the space for subsequent casting.

[0025] Preferably, when installing the stiffened composite beam and slab assembly, a post-cast space is formed between the ends of the stiffened panels of adjacent stiffened composite beam and slabs, the lap joint is implemented as a lap ring bar, the ends of the upper and lower plates of adjacent stiffened composite beam and slabs are reinforced to form U-shaped structural bars, and the lap ring bar is lapped to the U-shaped structural bars of the adjacent stiffened panels. When casting a precast portion, fill the space for subsequent casting.

[0026] Preferably, when installing the stiffened composite beam-slab assembly, the ends of the lower plates of adjacent stiffened composite beam-slabs are tightly joined together, and a post-cast groove is formed between the ends of the upper plates to accommodate the lower plates. A thermal insulation and sound insulation layer is provided in the post-cast groove. The lap joint is implemented as a lap bar, and the ends of the upper plates of adjacent stiffened composite beam-slabs are reinforced. The lap bar is lapped to the ends of the lower plates of adjacent stiffened composite beam-slabs. When casting a precast part, fill the post-casting groove.

[0027] Preferably, when installing the stiffened composite beam and plate assembly, the ends of the stiffening panels of adjacent stiffened composite beam and plate assemblies are closely joined together, and the lap joint is placed across the joint between the ends of the stiffening panels. When casting a precast part, the overlapping part is covered.

[0028] The technical effects of the above-mentioned technical solutions of the present invention arise from one or more of the following combinations: In this composite beam-slab structure, a single layer of cast-in-place concrete is poured on top of the installed stiffened composite beam-slab assembly, ultimately forming the composite beam-slab structure. This cast-in-place layer encapsulates all precast components (single T-slabs) and slab joints into a unified whole, eliminating assembly seams and giving the floor slab similar integrity and waterproofing to cast-in-place floor slabs, thus forming a highly integrated precast monolithic floor slab system.

[0029] Cast-in-place layers allow for easy adjustment of the final floor elevation, installation of various embedded parts, and provide a flat building surface base, facilitating subsequent decoration and finishing, and achieving both design flexibility and building flatness.

[0030] This structural system is a prefabricated monolithic structure consisting of "precast components + cast-in-place concrete". It is a widely recognized and recommended practice in my country's "Technical Standard for Prefabricated Concrete Buildings" (GB / T 51231) and other standards. It takes into account the efficiency of industrialized production and the overall reliability of cast-in-place structures, and meets the requirements of current standards for prefabricated structures.

[0031] The core components of the stiffened composite beam slab (including the insulation layer and shear keys) are prefabricated in the factory. The production environment is stable and the degree of modularization is high, which can effectively control the concrete strength, component dimensional accuracy and insulation layer quality. The product quality is far superior to that of on-site manual operation.

[0032] This construction method involves hoisting large precast components into place on-site, reducing multiple steps such as on-site formwork, reinforcement binding, and pouring reinforced concrete panels, significantly shortening the main structure construction cycle. While various side-connection methods exist for the slabs, all are designed for convenient rebar lap splicing or post-casting, resulting in high construction efficiency. Simultaneously, a large portion of concrete work is completed in the factory, with on-site work primarily involving hoisting, joint connections, and the construction of a relatively thin cast-in-place layer. This significantly reduces on-site construction noise, dust, and construction waste, aligning with green construction principles.

[0033] To achieve the above four objectives, the present invention provides an application of stiffened composite beams and slabs, which are applied to floor slabs or floor structures. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the stiffened composite beam plate of the present invention from one perspective.

[0035] Figure 2 This is a schematic diagram of the stiffened composite beam plate of the present invention from another perspective.

[0036] Figure 3 This is a schematic diagram of the installation of shear reinforcement in the stiffened composite beam and slab of the present invention.

[0037] Figure 4 This is a structural schematic diagram of the first stiffened composite beam plate of the present invention.

[0038] Figure 5 This is a structural schematic diagram of the first stiffened composite beam-plate assembly of the present invention.

[0039] Figure 6 This is a structural schematic diagram of the second type of stiffened composite beam plate of the present invention.

[0040] Figure 7 This is a structural schematic diagram of the second type of stiffened composite beam-plate assembly of the present invention.

[0041] Figure 8 This is a structural schematic diagram of the third type of stiffened composite beam plate of the present invention.

[0042] Figure 9 This is a structural schematic diagram of the third type of stiffened composite beam-plate assembly of the present invention.

[0043] Figure 10 This is a structural schematic diagram of the fourth type of stiffened composite beam plate of the present invention.

[0044] Figure 11 This is a structural schematic diagram of the fourth type of stiffened composite beam-plate assembly of the present invention.

[0045] Figure 12 This is a structural schematic diagram of the fifth type of stiffened composite beam plate of the present invention.

[0046] Among them: 1. Stiffening rib beam; 11. Stiffening rib beam reinforcement cage; 111. Stiffening rib beam longitudinal reinforcement; 112. Stiffening rib beam stirrups; 2. Stiffening panel; 21. Lower slab; 210. Lower slab structural longitudinal reinforcement; 211. Lower slab end reinforcement; 211a. Lap ring reinforcement; 22. Upper slab; 220. Upper slab structural longitudinal reinforcement; 221. Upper slab end reinforcement; 23. Thermal insulation and sound insulation layer; 24. Shear connection key; 3. Cast-in-place layer; 4. Additional shear reinforcement; 41. Embedded sleeve; 5. Lifting formwork; 6. Lap joint. Detailed Implementation

[0047] The following description is provided to enable those skilled in the art to implement and use the invention and adapt it to specific application contexts. Various modifications and uses in different applications will be readily apparent to those skilled in the art, and the general principles defined herein are applicable to a wide range of embodiments. Therefore, the invention is not limited to the embodiments given herein, but should be granted the broadest scope consistent with the principles and novel features disclosed herein.

[0048] In the following detailed description, numerous specific details are set forth to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that practice of the invention is not necessarily limited to these specific details. In other words, well-known structures and devices are shown in block diagram form without being depicted in detail to avoid obscuring the invention.

[0049] Readers should note all documents and references submitted concurrently with this specification and open to public inspection, the contents of which are incorporated herein by reference. Unless otherwise expressly stated, all features disclosed in this specification (including any appended claims, abstracts, and drawings) may be replaced by alternative features for the same, equivalent, or similar purposes. Therefore, unless explicitly stated otherwise, each disclosed feature is merely one example of a set of equivalent or similar features.

[0050] Note that, where used, the markings left, right, front, back, top, bottom, front, back, clockwise, and counterclockwise are merely for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or orientation between different parts of an object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] Note that, in practice, "further," "preferably," "even further," and "more preferably" are simply starting points for describing another embodiment based on the foregoing embodiments. The combination of the content following "further," "preferably," "even further," or "more preferably" with the foregoing embodiments constitutes the complete configuration of another embodiment. Any combination of several "further," "preferably," "even further," or "more preferably" settings following the same embodiment can form yet another embodiment.

[0053] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0054] "And / or" in parallel: means "both A and B"; "or" in alternative: means "either A or B"; "and / or" in combination: means "both A and B, and either A or B".

[0055] Structural Example 1: Please combine Figures 1-3 This embodiment provides a stiffened composite beam-slab, the structure of which mainly includes stiffening rib beams 1 and stiffening panels 2. The stiffening rib beams 1 are formed below the stiffening panels 2. The stiffening panels 2 include at least a precast part and a cast-in-place part. The precast part includes a lower slab 21, an upper slab 22, a thermal insulation and sound insulation layer 23, and a shear connection key 24. The lower slab 21 is integrally formed with the stiffening rib beams 1. The thermal insulation and sound insulation layer 23 is located between the upper slab 22 and the lower slab 21. The shear connection key 24 penetrates the thermal insulation and sound insulation layer 23 and is connected at both ends to the upper slab 22 and the lower slab 21, respectively. The cast-in-place part is located on the upper slab 22.

[0056] The stiffening rib beam 1 serves as the web of the stiffened composite beam-slab, located in the middle of the stiffening panel 2. Preferably, the two ends of the stiffening panel 2 are symmetrically cantilevered from the stiffening rib beam 1. The stiffening rib beam 1 contains a stiffening rib beam reinforcement cage 11, which includes longitudinal stiffening bars 111 and stirrups 112. Further, the longitudinal stiffening bars 111 can be implemented as prestressed tendons. Moreover, to improve the shear resistance of the stiffening rib beam 1, a pre-embedded sleeve 41 is embedded at the centerline of the beam thickness of the stiffening rib beam 1. This is achieved by subsequently connecting additional shear reinforcement 4 to enhance the shear resistance of the beam-slab joint with the structural beam. The additional shear reinforcement 4 is connected to the stiffening rib beam 1 by inserting the pre-embedded sleeve 41.

[0057] Similarly, the stiffened panel 2 serves as the upper plate (cantilever plate) of the stiffened composite beam slab. Both the upper plate 22 and the lower plate 21 are equipped with structural reinforcement bars, which are in the form of longitudinally and transversely arranged steel mesh. Depending on the plate thickness and structural selection, they can be further implemented as prestressed reinforcement bars.

[0058] Furthermore, the shear connection key 24, acting as a shear key in the stiffened composite beam-slab, significantly improves the structural stiffness of the stiffened panel 2. Its two ends connect to the upper plate 22 and the lower plate 21 respectively, with the middle section penetrating the thermal insulation and soundproofing layer 23. In specific implementation, the two ends (top and bottom) of the shear connection key 24 are connected to the structural reinforcement of the upper plate 22 and the lower plate 21 respectively, forming an effective connection. Preferably, pins can also be installed at the top and bottom sections of the shear connection key 24 to increase its bolting effect on the upper plate 22 and the lower plate 21. This is the first time that sandwich panels have been applied to single T-slabs, overcoming the problems of easy cracking and insufficient functionality of cantilevered single T-slabs.

[0059] Furthermore, the top of the shear connection key 24 can extend above the upper plate 22 to form a further shear key effect on the surface of the upper plate 22. Its extension height is not higher than the cast-in-place part, and a protective layer should also be formed between it and the top surface of the cast-in-place part, so as to serve as the elevation control point of the cast-in-place layer 3.

[0060] In a preferred embodiment of this invention, the thermal insulation and sound insulation layer 23 is preferably made of polyurethane foam.

[0061] In a preferred embodiment of this invention, the shear connection key 24 is a steel pipe. Furthermore, the steel pipe can be a round pipe, a square pipe, a polygonal pipe, etc.

[0062] As a preferred embodiment of this example, multiple shear connection keys 24 are evenly arranged inside the stiffening panel 2, and their specifications can be determined in a timely manner according to actual construction needs and the cantilever distance of the stiffening panel 2.

[0063] Furthermore, such as Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, to improve the strength and shear resistance of the stiffening rib beam 1 and stiffening panel 2 structure, at least one shear connection key 24 is provided at the stiffening rib beam 1, with the bottom of the shear connection key 24 connected to the stiffening rib beam 1. Furthermore, multiple shear connection keys 24 are spaced apart along the beam length of the stiffening rib beam 1. Preferably, the bottom of the shear connection key 24 is connected to the stiffening rib beam reinforcement cage 11. Further still, the structural reinforcement of the stiffening panel 2, including the longitudinal reinforcement (lower slab longitudinal reinforcement 210 and / or upper slab longitudinal reinforcement 220) in the same direction as the stiffening rib beam longitudinal reinforcement 111, passes through the shear connection key 24. This allows the shear connection key 24 to act as a tie bar, connecting the stiffening rib beam reinforcement cage 11 and the structural reinforcement of the stiffening panel 2, thereby increasing the effective mechanical height of the stiffening rib beam 1.

[0064] like Figure 12 As shown and combined Figure 4 , Figure 6 , Figure 8 and Figure 10 The shear-resistant connecting key 24 of the stiffening panel 2 structure in this embodiment has three specific implementation methods: In this embodiment, shear connection key 24 is provided only at the stiffening panel 2 structure (the position is not corresponding to the stiffening rib beam 1); or, the shear connection key 24 at the stiffening rib beam 1 is provided as an independent implementation (the position corresponds to the stiffening rib beam 1); or, the shear connection key 24 at the stiffening rib beam 1 is provided in combination with the shear connection key 24 at the stiffening panel 2 structure.

[0065] There are two stiffening methods for stiffening rib 1, one of which is... Figure 12 In the middle, the steel cage structure in the stiffening rib beam 1 extends into the stiffening panel 2, thus distinguishing it from traditional composite beams; secondly, as... Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, a shear connection key 24 is provided at the stiffening rib beam 1, extending from the stiffening panel 2 into the reinforcing cage structure within the stiffening rib beam 1. Furthermore, the shear connection key 24 can be fixedly connected to the reinforcing cage within the stiffening rib beam 1.

[0066] like Figure 1 As shown, when the cantilever distance of the lower plate 21 is greater than that of the upper plate 22, a shear-resistant connecting key 24 can be added separately at the edge of the lower plate 21. The bottom of the shear-resistant connecting key 24 is embedded in the lower plate 21, and its top is flush with the upper plate surface of the upper plate 22; or its top is higher than the upper plate surface of the upper plate 22.

[0067] In this embodiment, the thickness of the lower layer 21 is h1, the thickness of the thermal insulation and soundproofing layer 23 is h2, the thickness of the upper layer 22 is h3, the thickness of the cast-in-place layer 3 formed by the cast-in-place portion is h4, the thickness of the precast portion of the stiffening panel 2 is h5, the overall thickness of the stiffening panel 2 is h6, the thickness of the precast portion of the stiffening rib beam 1 + stiffening panel 2 is h7, and the overall thickness of the stiffening rib beam 1 + stiffening panel 2 is h8. During the construction phase, the cast-in-place concrete has not yet hardened, and the stress height at the stiffening rib beam 1 with the largest bending moment is h7; during the service phase, the cast-in-place layer 3 concrete has hardened, and the stress height is h8.

[0068] Structural Example 2: Please refer to Figures 4-11 This embodiment provides a stiffened composite beam-plate assembly, comprising multiple stiffened composite beam-plates as described in Embodiment 1. Specifically, adjacent stiffened composite beam-plates on the side of the stiffening panel 2 are connected by lap joints 6.

[0069] Regarding the structure of stiffened composite beams and plates, in view of the above-described embodiment 1, and the implementation method of splicing at least two stiffened composite beams and plates to form a two-way plate, this embodiment provides at least four specific implementation methods, which are detailed below: I. Please refer to Figure 4 and Figure 5 A post-cast space is formed between the ends of the stiffening panels 2 of adjacent stiffened composite beam slabs. A suspended formwork 5 is installed below this post-cast space to facilitate the casting of the cast-in-place layer 3. The lap joint 6 is implemented as a lap bar, and its structure is not limited. Specifically, the lap bar overlaps with the end lap bar 211 of the lower layer slab of the adjacent stiffened composite beam slab, forming an effective lap joint. Furthermore, a separate thermal insulation and sound insulation layer 23 is provided within the post-cast space to achieve continuity of thermal insulation and sound insulation for the overall stiffened panel 2.

[0070] II. Please refer to Figure 6 and Figure 7 A post-casting space is formed between the ends of the stiffening panels 2 of adjacent stiffened composite beams. A suspended formwork 5 is installed below this post-casting space to facilitate the casting of the cast-in-place layer 3. The lap joint 6 is implemented as an lapped ring reinforcement 211a. Specifically, the ends of the upper and lower plates of adjacent stiffened composite beams 22 extend with reinforcement 211 to form U-shaped structural reinforcement. The lapped ring reinforcement 211a laps onto the U-shaped structural reinforcement of the adjacent stiffened panel 2, forming an effective lap. Furthermore, foamed concrete can be poured within the post-casting space to achieve continuity of thermal insulation and soundproofing for the overall stiffened panel 2.

[0071] III. Please refer to Figure 8 and Figure 9 The lower slabs 21 of adjacent stiffened composite beam slabs are closely joined at their ends, and the upper slabs 22 are fitted together with the lower slabs 21 to form a post-cast groove. An insulation and soundproofing layer 23 is installed within the post-cast groove. Specifically, the lap joint 6 is implemented as a lap bar, with the upper slab of the adjacent stiffened composite beam slab having an end bar 221, and the lap bar laps onto the end bar 221 of the adjacent upper slab. Furthermore, the insulation and soundproofing layers 23 on both sides of the post-cast groove extend and interlock, achieving continuity of insulation and soundproofing for the overall stiffened panel 2.

[0072] IV. Please refer to Figure 10 and Figure 11 The ends of the stiffening panels 2 of adjacent stiffened composite beams are tightly joined together, and lap joints 6 are installed across the joint between the ends of the stiffening panels 2. Preferably, the lap joints 6 are lap bars, and their lengths on both sides of the joint are determined as appropriate.

[0073] Structural Example 3: Please combine Figures 1-11This embodiment also provides a composite beam-slab structure, including the stiffened composite beam-slab assembly of structural embodiment 2. Its core feature is the casting of a cast-in-place layer 3 on the stiffened composite beam-slab assembly to form a floor slab or floor cover. Specifically, the cast-in-place portion of the stiffened composite beam-slab assembly is integrally cast onto the stiffened panel 2 to form the cast-in-place layer 3.

[0074] Method Example 1: Please combine Figures 1-11 This embodiment provides a construction method for stiffened composite beam-slab assemblies, which mainly includes three main steps.

[0075] S1: Precast stiffened composite beam slab.

[0076] Specifically, the precast stiffened composite beam slab includes a stiffened panel 2 and a stiffened rib beam 1. The stiffened panel 2 includes at least a precast part and a cast-in-place part. The precast part includes a lower slab 21, an upper slab 22, a thermal insulation and sound insulation layer 23, and a shear connection key 24. The lower slab 21 and the stiffened rib beam 1 are integrally formed. The shear connection key 24 passes through the thermal insulation and sound insulation layer 23 and is connected at both ends to the upper slab 22 and the lower slab 21, respectively.

[0077] The stiffening rib 1 serves as the web of the stiffened composite beam-slab and is located in the middle of the stiffened panel 2. Preferably, the two ends of the stiffened panel 2 are symmetrically cantilevered from the stiffening rib 1. The stiffening rib 1 contains a stiffening rib reinforcement cage 11, which includes longitudinal stiffening bars 111 and stirrups 112. Further, the longitudinal stiffening bars 111 can be implemented as prestressed tendons.

[0078] Similarly, the stiffened panel 2 serves as the upper plate (cantilever plate) of the stiffened composite beam slab. Both the upper plate 22 and the lower plate 21 are equipped with structural reinforcement bars, which are in the form of longitudinally and transversely arranged steel mesh. Depending on the plate thickness and structural selection, they can be further implemented as prestressed reinforcement bars.

[0079] Furthermore, the shear connection key 24, acting as a shear key in the stiffened composite beam-slab, significantly improves the structural stiffness of the stiffened panel 2. Its two ends connect to the upper plate 22 and the lower plate 21 respectively, with the middle section penetrating the thermal insulation and soundproofing layer 23. In specific implementation, the two ends (top and bottom) of the shear connection key 24 are connected to the structural reinforcement of the upper plate 22 and the lower plate 21 respectively, forming an effective connection. Preferably, pins can also be installed at the top and bottom sections of the shear connection key 24 to increase its bolting effect on the upper plate 22 and the lower plate 21. This is the first time that sandwich panels have been applied to single T-slabs, overcoming the problems of easy cracking and insufficient functionality of cantilevered single T-slabs.

[0080] Furthermore, the top of the shear connection key 24 can extend above the upper plate 22, forming a further shear connection effect on the surface of the upper plate 22. Its extension height should not exceed the cast-in-place part, and a protective layer should be formed between it and the top surface of the cast-in-place part. Therefore, the shear connection key 24 is also an elevation control point.

[0081] In a preferred embodiment of this invention, the thermal insulation and sound insulation layer 23 is preferably made of polyurethane foam.

[0082] In a preferred embodiment of this invention, the shear connection key 24 is a steel pipe. Furthermore, the steel pipe can be a round pipe, a square pipe, a polygonal pipe, etc.

[0083] As a preferred embodiment of this example, multiple shear connection keys 24 are evenly arranged inside the stiffening panel 2, and their specifications can be determined in a timely manner according to actual construction needs and the cantilever distance of the stiffening panel 2.

[0084] Furthermore, such as Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, to improve the strength and shear resistance of the stiffening rib beam 1 and stiffening panel 2 structure, at least one shear connection key 24 is provided at the stiffening rib beam 1, with the bottom of the shear connection key 24 connected to the stiffening rib beam 1. Furthermore, multiple shear connection keys 24 are spaced apart along the beam length of the stiffening rib beam 1. Preferably, the bottom of the shear connection key 24 is connected to the stiffening rib beam reinforcement cage 11. Further still, the structural reinforcement of the stiffening panel 2, including the longitudinal reinforcement (lower slab longitudinal reinforcement 210 and / or upper slab longitudinal reinforcement 220) in the same direction as the stiffening rib beam longitudinal reinforcement 111, passes through the shear connection key 24. This allows the shear connection key 24 to act as a tie bar, connecting the stiffening rib beam reinforcement cage 11 and the structural reinforcement of the stiffening panel 2, thereby increasing the effective mechanical height of the stiffening rib beam 1.

[0085] like Figure 12 As shown and combined Figure 4 , Figure 6 , Figure 8 and Figure 10 The shear-resistant connecting key 24 of the stiffening panel 2 structure in this embodiment has three specific implementation methods: In this embodiment, shear connection key 24 is provided only at the stiffening panel 2 structure (the position is not corresponding to the stiffening rib beam 1); or, the shear connection key 24 at the stiffening rib beam 1 is provided as an independent implementation (the position corresponds to the stiffening rib beam 1); or, the shear connection key 24 at the stiffening rib beam 1 is provided in combination with the shear connection key 24 at the stiffening panel 2 structure.

[0086] There are two stiffening methods for stiffening rib 1, one of which is... Figure 12In the middle, the steel cage structure in the stiffening rib beam 1 extends into the stiffening panel 2, thus distinguishing it from traditional composite beams; secondly, as... Figure 4 , Figure 6 , Figure 8 and Figure 10 As shown, a shear connection key 24 is provided at the stiffening rib beam 1, extending from the stiffening panel 2 into the reinforcing cage structure within the stiffening rib beam 1. Furthermore, the shear connection key 24 can be fixedly connected to the reinforcing cage within the stiffening rib beam 1.

[0087] like Figure 1 As shown, when the cantilever distance of the lower plate 21 is greater than that of the upper plate 22, a shear-resistant connecting key 24 can be added separately at the edge of the lower plate 21. The bottom of the shear-resistant connecting key 24 is embedded in the lower plate 21, and its top is flush with the upper plate surface of the upper plate 22; or its top is higher than the upper plate surface of the upper plate 22.

[0088] Exemplary implementation: First, reinforcement bars are laid on the stiffening rib beam 1 and the lower plate 21 on the casting mold, and shear connection keys 24 can be installed at the same time to integrally cast the stiffening rib beam 1 and the lower plate 21. Then, the thermal insulation and sound insulation layer 23 is formed on the lower plate 21. Finally, reinforcement bars are laid on the upper plate 22 and then cast to form the upper plate 22, forming a stiffened composite beam plate.

[0089] S2: Install stiffened composite beam-plate assembly.

[0090] Specifically, the stiffened composite beams are hoisted onto the main structure, and the stiffened composite beams adjacent to each other on the side of the stiffening panel 2 are connected by lap joints 6.

[0091] Regarding the structure of stiffened composite beams and plates, in view of the above-described embodiment 1, and the implementation method of splicing at least two stiffened composite beams and plates to form a two-way plate, this embodiment provides at least four specific implementation methods, which are detailed below: 1. A post-casting space is formed between the ends of the stiffening panels 2 of adjacent stiffened composite beam slabs. A suspended formwork 5 is provided below this post-casting space to facilitate the casting of the cast-in-place layer 3. The lap joint 6 is implemented as a lap bar, and its structure is not restricted. Specifically, the end reinforcement 211 of the lower layer slab of the adjacent stiffened composite beam slab is lapped to the end reinforcement 211 of the adjacent lower layer slab to form an effective lap joint. Furthermore, a separate thermal insulation and sound insulation layer 23 is provided in the post-casting space to achieve the continuity of thermal insulation and sound insulation of the overall stiffened panel 2.

[0092] 2. A post-casting space is formed between the ends of the stiffened panels 2 of adjacent stiffened composite beams. A suspended formwork 5 is installed below this post-casting space to facilitate the casting of the cast-in-place layer 3. The lap joint 6 is implemented as an lapped ring reinforcement 211a. Specifically, the ends of the upper and lower plates of the adjacent stiffened composite beams 22 extend with reinforcement 211 to form U-shaped structural reinforcements. The lapped ring reinforcement 211a laps onto the U-shaped structural reinforcements of the adjacent stiffened panels 2, forming an effective lap. Furthermore, foamed concrete can be poured in the post-casting space to achieve the continuity of thermal insulation and sound insulation of the overall stiffened panels 2.

[0093] Third, the lower slabs 21 of adjacent stiffened composite beam slabs are closely joined at their ends, and the upper slabs 22 are joined at their ends to form a post-cast groove, within which a thermal insulation and soundproofing layer 23 is provided. Specifically, the lap joint 6 is implemented as a lap bar, with the upper slab of the adjacent stiffened composite beam slab having an end bar 221, and the lap bar overlapping the end bar 221 of the adjacent upper slab. Furthermore, the thermal insulation and soundproofing layers 23 on both sides of the post-cast groove extend and interlock, achieving continuity of thermal insulation and soundproofing for the overall stiffened panel 2.

[0094] 4. The ends of the stiffening panels 2 of adjacent stiffened composite beams are tightly joined together, and the lap joint 6 is installed across the joint between the ends of the stiffening panels 2. Preferably, the lap joint 6 is a lap bar, and its length on both sides of the joint is determined as appropriate.

[0095] Exemplary implementation: The stiffened composite beam is hoisted to the designated position, typically on a frame structure. The ends of the stiffening panels 2 of adjacent stiffened composite beams are tightly joined to form a joint, which can be waterproofed and leak-proofed. Along the length of the stiffening rib beam 1, multiple lapped bars are sequentially installed across the joint between the ends of the stiffening panels 2.

[0096] S3: A precast part formed by casting.

[0097] Specifically, the cast-in-place portion of the stiffened composite beam-slab assembly is integrally cast onto the stiffened panel 2 to form a cast-in-place layer 3.

[0098] In this embodiment, the thickness of the lower layer 21 is h1, the thickness of the thermal insulation and soundproofing layer 23 is h2, the thickness of the upper layer 22 is h3, the thickness of the cast-in-place layer 3 formed by the cast-in-place portion is h4, the thickness of the precast portion of the stiffening panel 2 is h5, the overall thickness of the stiffening panel 2 is h6, the thickness of the precast portion of the stiffening rib beam 1 + stiffening panel 2 is h7, and the overall thickness of the stiffening rib beam 1 + stiffening panel 2 is h8. During the construction phase, the cast-in-place concrete has not yet hardened, and the stress height at the stiffening rib beam 1 with the largest bending moment is h7; during the service phase, the cast-in-place layer 3 concrete has hardened, and the stress height is h8.

[0099] Exemplary implementation: After the stiffened composite beam and slab assembly is installed, the upper slab 22 is integrally cast to form the cast-in-place layer 3, and the thickness of the cast-in-place layer 3 is at least enough to cover the lap joint reinforcement.

[0100] Application Examples: This embodiment provides an application of stiffened composite beams and slabs. Specifically, the stiffened composite beams and slabs are applied to floor slabs or floor structures. The structure of the stiffened composite beams and slabs has been described in detail in Structural Embodiment 1 and will not be repeated here.

[0101] Specifically, a waterproof layer can be laid between the stiffened panels 2 to serve as a floor slab; a cast-in-place floor layer 3 can be poured on the stiffened panels 2 to form a composite floor slab.

[0102] Furthermore, the present invention has been described in detail above with reference to the accompanying drawings and embodiments. Those skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention, and the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A stiffened composite beam-plate, comprising stiffening ribs and a stiffening panel, wherein the stiffening ribs are formed below the stiffening panel, characterized in that, The stiffening panel includes at least a precast portion and a cast-in-place portion. The precast portion includes a lower slab, an upper slab, a thermal insulation and sound insulation layer, and a shear-resistant connecting key. The lower slab is integrally formed with the stiffening rib beam. The thermal insulation and sound insulation layer is located between the upper slab and the lower slab. The shear-resistant connecting key passes through the thermal insulation and sound insulation layer and is connected at both ends to the upper slab and the lower slab, respectively. The cast-in-place portion is located on the upper slab.

2. The stiffened composite beam-slab as described in claim 1, characterized in that: The shear-resistant connecting key is a steel pipe.

3. The stiffened composite beam-slab as described in claim 1, characterized in that: At least one of the shear connecting keys is located at the stiffening rib, and the bottom of the shear connecting key is connected to the stiffening rib.

4. The stiffened composite beam-slab as described in claim 3, characterized in that: Multiple shear connection keys are arranged along the beam length of the stiffening rib beam, and the bottom of the shear connection key is connected to the stiffening rib beam reinforcement cage of the stiffening rib beam. The structural reinforcement of the stiffening panel passes through the shear connection key.

5. A stiffened composite beam-slab assembly, characterized in that, It includes multiple stiffened composite beams as described in any one of claims 1 to 4; the stiffened composite beams adjacent to each other on the side of the stiffening panel are connected by lap joints.

6. The stiffened composite beam-slab assembly as described in claim 5, characterized in that: A post-cast space is formed between the ends of the stiffening panels of adjacent stiffened composite beams and slabs. The ends of the lower slabs of adjacent stiffened composite beams and slabs are reinforced. The lap joint overlaps with the ends of the lower slabs of adjacent slabs. A separate thermal insulation and sound insulation layer is provided in the post-cast space.

7. The stiffened composite beam-slab assembly as described in claim 5, characterized in that: A post-cast space is formed between the ends of the stiffening panels of adjacent stiffened composite beams and slabs. The ends of the upper and lower plates of adjacent stiffened composite beams and slabs extend outwards to form U-shaped structural reinforcements. The lap joint overlaps with the U-shaped structural reinforcements of the adjacent stiffening panels.

8. The stiffened composite beam-slab assembly as described in claim 5, characterized in that: The lower plate ends of adjacent stiffened composite beam slabs are closely joined, and the upper plate ends cooperate with the lower plate to form a post-cast groove, which is provided with a thermal insulation and sound insulation layer; the upper plate ends of adjacent stiffened composite beam slabs have reinforcing bars, and the lap joint overlaps with the end reinforcing bars of the adjacent upper plate.

9. The stiffened composite beam-slab assembly as described in claim 5, characterized in that: The stiffening panels of adjacent stiffened composite beams are closely joined at their ends, and the lap joint spans the joint between the ends of the stiffening panels.

10. A composite beam-slab structure, characterized in that, Includes the stiffened composite beam-slab assembly as described in any one of claims 5 to 9, wherein the cast-in-place portion of the stiffened composite beam-slab assembly is integrally cast onto the stiffened panel to form a cast-in-place layer.

11. A construction method for a composite beam-slab structure as described in claim 10, characterized in that, Includes the following steps: A precast stiffened composite beam-slab, comprising a stiffening panel and stiffening ribs, wherein the stiffening panel comprises at least a precast portion and a cast-in-place portion, the precast portion comprising a lower slab, an upper slab, a thermal insulation and sound insulation layer, and shear connecting keys, wherein the lower slab and the stiffening ribs are integrally formed, and the shear connecting keys penetrate the thermal insulation and sound insulation layer and are respectively connected at both ends to the upper slab and the lower slab; Install the stiffened composite beam plate assembly, hoist the stiffened composite beam plate onto the main structure, and connect the stiffened composite beam plates adjacent to each other on the side of the stiffened panel by lap joints; One of the precast cast-in-place components is integrally cast onto the stiffened panel to form a cast-in-place layer.

12. The construction method as described in claim 11, characterized in that: When installing the stiffened composite beam and slab assembly, a post-cast space is formed between the ends of the stiffened panels of adjacent stiffened composite beams and slabs. The ends of the lower slabs of the adjacent stiffened composite beams and slabs are reinforced, and the lap joints are lapped onto the ends of the lower slabs of the adjacent slabs. A separate thermal insulation and sound insulation layer is provided in the post-cast space. When casting a precast portion, fill the space for subsequent casting.

13. The construction method as described in claim 11, characterized in that: When installing the stiffened composite beam and slab assembly, a post-cast space is formed between the ends of the stiffened panels of the adjacent stiffened composite beam and slab. The ends of the upper and lower plates of the adjacent stiffened composite beam and slab are reinforced to form U-shaped structural reinforcement. The lap joint is lapped to the U-shaped structural reinforcement of the adjacent stiffened panel. When casting a precast portion, fill the space for subsequent casting.

14. The construction method as described in claim 11, characterized in that: When installing the stiffened composite beam and slab assembly, the ends of the lower layer plates of the adjacent stiffened composite beam and slab are tightly joined together, and a post-cast groove is formed between the ends of the upper layer plates in conjunction with the lower layer plates. A heat insulation and sound insulation layer is provided in the post-cast groove. The ends of the upper layer plates of the adjacent stiffened composite beam and slab are reinforced, and the lap joint is lapped to the ends of the adjacent upper layer plates. When casting a precast part, fill the post-casting groove.

15. The construction method as described in claim 11, characterized in that: When installing the stiffened composite beam and plate assembly, the ends of the stiffening panels of adjacent stiffened composite beam and plate assemblies are tightly joined together, and the lap joint is placed across the joint between the ends of the stiffening panels. When casting a precast part, the overlapping part is covered.

16. An application of a stiffened composite beam-slab as described in any one of claims 1 to 4, characterized in that, The stiffened composite beam-slab is used in floor slabs or floor panels.

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