Construction method of large-span steel structure concrete floor system and large-span steel structure building

Abstract

The invention provides a construction method of a large-span steel structure concrete floor system and a large-span steel structure building, and relates to the technical field of steel structures. The construction method of the large-span steel structure concrete floor system comprises the following steps that the large-span steel truss is installed at the preset position of the core tube; in the vertical upward direction, floor structures are sequentially installed between the large-span steel trusses, and floors are divided; and in the vertical upward direction, floor slab structures are sequentially installed on all the floors. And in the vertical downward direction, concrete is poured on the floor slab structure of each floor in sequence. By improving the construction method, the risk of cracking of the floor system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of steel structures, and in particular to a construction method for a large-span steel structure concrete floor and a large-span steel structure building. Background Art

[0002] Steel structures are widely used in large-span building structures because of their high material strength and relatively light weight. During the construction of steel structures, the self-weight load gradually accumulates as the construction process is completed. After the steel structure is installed, the main load is the self-weight of the components. After the floor slab is poured, the self-weight of the floor slab, the self-weight of the brick partition wall and the corresponding construction load are added. After the decoration and renovation are completed and put into use, the additional floor dead load and live load are added. In addition, during the use stage, it will also be subject to wind loads and earthquakes. With the increase of loads, the vertical deformation of the steel structure itself is also gradually increasing. Especially for large-span steel structures, this vertical deformation may still be within the allowable deformation range of steel structure components, but for concrete floor slabs, this deformation is enough to cause floor slab cracking. To address this problem, it is generally solved by increasing the floor slab thickness and reinforcement in the design stage and setting post-casting strips in the construction stage. These methods can reduce the risk of concrete floor slab cracking to a certain extent. However, in actual projects, structural floor slab cracking still occurs at places with large deformation and large floor slab stress. Summary of the invention

[0003] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a construction method for a large-span steel structure concrete floor and a large-span steel structure building, so as to reduce the risk of floor cracking by improving the construction method.

[0004] This application provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a construction method for a large-span steel structure concrete floor slab, the construction method for the large-span steel structure concrete floor slab comprising:

[0006] Install long-span steel trusses at preset locations on the core tube;

[0007] In the vertical upward direction, the floor structure is sequentially installed between the long-span steel trusses to divide the floors; and, in the vertical upward direction, the floor slab structure is sequentially installed on each of the floors;

[0008] In a vertical downward direction, concrete is poured onto the floor structure of each floor in turn.

[0009] In some embodiments of the first aspect, the installing a floor structure between the long-span steel trusses comprises:

[0010] The floor structure includes floor steel beams, which are installed between the long-span steel trusses;

[0011] The step of installing the floor structure on each floor comprises:

[0012] The floor structure includes corrugated steel plates and floor steel bars. The corrugated steel plates are laid on each floor, and the floor steel bars are tied to the corrugated steel plates.

[0013] In some embodiments of the first aspect, before pouring concrete on the floor structure of each floor in sequence in a vertical downward direction, the method further comprises:

[0014] In the longitudinal span direction of the large-span steel truss, multiple core tubes are arranged at intervals; wherein, a first post-cast strip is arranged on the side of the outermost core tube of each floor away from the middle of the floor, a second post-cast strip is arranged on the side of the outermost core tube of the uppermost floor close to the middle of the floor, and second post-cast strips are respectively arranged on both sides of the core tube of the middle of the uppermost floor, and the first post-cast strip and the second post-cast strip are arranged in parallel.

[0015] In some embodiments of the first aspect, the width of the first post-casting strip is L1, and satisfies: 1.9m≤L1≤2.1m;

[0016] And / or, the width of the second post-cast strip is L2, and satisfies: 1.9m≤L2≤2.1m.

[0017] In some embodiments of the first aspect, pouring concrete on the floor structure of each floor comprises:

[0018] pouring concrete into the area of ​​the outermost core tube on the side away from the middle of the floor;

[0019] The area between adjacent core tubes is divided into two construction areas in the transverse span direction, and the two construction areas are constructed and poured with concrete at the same time;

[0020] Concrete is poured into the areas on both sides of the outermost core tube of the floor structure in the transverse span direction.

[0021] In some embodiments of the first aspect, after pouring concrete on the floor structure of each floor, the method further comprises:

[0022] 28 days after pouring concrete on the floor structure of each floor, stacking ballast materials in designated areas on the floor structure, the ballast materials being equivalent to subsequent building materials, and the load of the ballast materials not exceeding the maximum design load of the floor structure;

[0023] Concrete is poured into the first post-casting zone and the second post-casting zone.

[0024] In some embodiments of the first aspect, the floor structure of each floor includes a plurality of sub-slabs, the plurality of sub-slabs are arranged in sequence in the longitudinal span direction, and adjacent sub-slabs are connected by pull-out resistant but not shear resistant studs.

[0025] In some embodiments of the first aspect, thickened corrugated steel plates are provided in stress concentration areas of the floor structure, and the number of reinforcements of the floor steel bars is increased.

[0026] In some embodiments of the first aspect, a plurality of the core tubes are spaced apart in the transverse span direction.

[0027] In a second aspect, the present application further provides a large-span steel structure building, wherein the large-span steel structure building applies the construction method of the large-span steel structure concrete floor as described in any of the above embodiments.

[0028] The embodiments of the present application have the following advantages:

[0029] The present application provides a construction method for a large-span steel structure concrete floor. The steel truss, floor structure and floor structure are installed through specific steps and sequence, and concrete is poured in sequence in a vertical downward direction, which can reduce the vertical deformation caused by the gradual increase of the deadweight of the structure, effectively reduce the risk of cracking of the concrete floor due to excessive deformation during the hardening process, and improve the overall quality of the floor. In addition, the large-span steel truss is first installed on the core tube, and then the floor structure is installed upward and divided into floors, and finally the floor structure is installed. It is ensured that each layer of the structure has a stable foundation support, improves the tightness of the connection between the layers and the stability of the entire building structure, and is also convenient for accurately controlling the construction quality of each step. Furthermore, a phased construction method is adopted, that is, the construction of the steel truss and floor structure is completed first, and then the concrete is poured. It is helpful to reasonably arrange construction resources and optimize the construction process, so that the work of each stage can be carried out in an orderly manner, which is conducive to shortening the overall construction period. And, by improving the construction method, especially adopting a reverse order method when pouring concrete, the stress distribution caused by load accumulation can be more effectively controlled. This not only enhances the safety performance of the building, but also extends its service life and reduces subsequent maintenance costs.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the principle flow of a construction method for a large-span steel structure concrete floor provided in an embodiment of the present application is shown;

[0033] Figure 2 A structural schematic diagram of a large-span steel structure building provided by an embodiment of the present application is shown from one perspective;

[0034] Figure 3 A structural schematic diagram of a large-span steel structure building provided by an embodiment of the present application from another perspective is shown;

[0035] Figure 4 A structural schematic diagram from another perspective of a large-span steel structure building provided by an embodiment of the present application is shown.

[0036] Description of main component symbols:

[0037] 100-core tube; 200-first post-cast joint; 300-second post-cast joint; 400-large-span steel truss; 500-floor structure; 510-corrugated steel plate; 520-floor steel beam; 530-sub-slab; 600-counterweight material; 700-pull-out but not shear-resistant studs. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a centered element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] In the related art, steel structure is widely used in large-span building structures because of its high material strength and relatively light weight. During the construction of steel structure, the load of self-weight gradually accumulates with the completion of the construction process. After the installation of steel structure is completed, the main load is the self-weight of the components. After the floor slab is poured, the self-weight of the floor slab, the self-weight of the brick partition wall and the corresponding construction load are increased. The decoration and renovation are completed and put into use, and the additional floor dead load and live load are increased. In addition, during the use stage, it will also be subject to wind load and earthquake action. With the increase of load, the vertical deformation of the steel structure itself is also gradually increasing. Especially for large-span steel structures, this vertical deformation may still be within the deformation range allowed by steel structure components, but for concrete floor slabs, this deformation is enough to cause floor slab cracking. To address this problem, it is generally solved by increasing the thickness and reinforcement of the floor slab in the design stage and setting post-casting strips in the construction stage. These methods can reduce the risk of concrete floor slab cracking to a certain extent. However, in actual engineering, structural floor slab cracking still occurs at places with large deformation and large floor slab stress.

[0044] like Figure 1 , Figure 2 and Figure 3As shown, in order to solve the above technical problems, an embodiment of the present application provides a construction method of a large-span steel structure concrete floor slab, and the construction method of the large-span steel structure concrete floor slab comprises the following steps:

[0045] S100: Install the long-span steel truss 400 at a preset position on the core tube 100.

[0046] In this embodiment, a large-span steel truss 400 is installed. The large-span steel truss 400 is installed at a preset position of the core tube 100. For example, the main vertical structure in a building usually includes an elevator shaft, a stairwell, and the like.

[0047] Providing the critical supporting framework for the entire structure, ensuring it has sufficient strength and stability to carry subsequent floors and all anticipated loads.

[0048] S200: In the vertical upward direction, the floor structure is installed between the large-span steel trusses 400 in sequence, and the floors are divided; and, in the vertical upward direction, the floor structure 500 is installed in each of the floors in sequence.

[0049] In these embodiments, the floor structure is installed and the floors are divided. In the vertical upward direction, the floor structure is installed sequentially between the installed large-span steel trusses 400. According to the design requirements, the building is divided into floors. In the vertical upward direction, the floor structure 500 is installed on each divided floor.

[0050] The layers of the building are gradually built up, and the floor structure 500 is laid for each layer to facilitate the subsequent concrete pouring work. This process requires precise measurement and positioning to ensure that the connection between the layers is tight and stable.

[0051] S300: In a vertical downward direction, pour concrete onto the floor structure 500 of each floor in turn.

[0052] In these embodiments, concrete is poured. Starting from the topmost floor, concrete is poured on the floor structure 500 of each floor in a vertical downward direction.

[0053] By pouring concrete sequentially from top to bottom, the deformation problem caused by the gradual increase of the structure's own weight can be reduced, thereby effectively reducing the risk of cracks in the concrete floor. This method can also help control the distribution of structural stress caused by load accumulation and improve the safety and durability of the overall structure.

[0054] Obviously, pouring in reverse order: Unlike the traditional pouring method from the bottom to the top, the method proposed in this application is to pour concrete layer by layer from the top to the bottom. Such a construction sequence can more effectively manage the deformation caused by deadweight and help prevent cracks from forming. In other words, this method can effectively reduce the deformation caused by load accumulation and reduce the risk of cracks in the concrete floor by changing the traditional construction process, that is, completing the pouring of the top floor concrete first, and then proceeding step by step downward. In addition, this method can also help better manage construction progress and resource allocation; and the hardening of concrete on the upper floors can support the construction activities on the lower floors to a certain extent.

[0055] Phased construction: This method emphasizes the importance of phased construction, which starts with the installation of steel trusses, followed by the construction of the floor structure, and finally the pouring of concrete. Each stage requires strict adherence to construction specifications and technical standards to ensure the quality of the final structure and reduce concrete cracking and deformation of the floor slab.

[0056] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the floor structure is installed between the long-span steel trusses 400, including:

[0057] The floor structure includes floor steel beams 520 and steel secondary beams, and the floor steel beams 520 and steel secondary beams are installed between the long-span steel trusses 400.

[0058] In these embodiments, the step of installing the floor structure between the long-span steel trusses 400 is further refined to include installing the floor steel beams 520 and the steel secondary beams. Specifically, the floor steel beams 520 are the main load-bearing members in the floor structure, connecting and supporting the long-span steel trusses 400, while also providing in-plane stiffness for the floors and helping to distribute the load to the lower structure.

[0059] When installing the floor steel beam 520 between the long-span steel trusses 400, it is necessary to ensure that the floor steel beam 520 is positioned accurately and firmly connected to the steel trusses. High-strength bolts or welding are usually used to fix the frame beam to the steel trusses to ensure sufficient strength and stability.

[0060] The steel secondary beams are located between the floor steel beams 520 and are used to subdivide the floor grid, increase the integrity and local stiffness of the floor slab, and serve as a supporting structure for the floor slab formwork.

[0061] The installation of the steel secondary beams is carried out after the installation of the floor steel beams 520 is completed. They are arranged in a grid system, arranged perpendicular to the direction of the main beams, and connected to the floor steel beams 520 by welding or bolts. The spacing of the steel secondary beams is determined according to the design requirements to meet the requirements of the floor slab bearing capacity and flatness.

[0062] Whether it is the floor steel beam 520 or the steel secondary beam, the size and position accuracy must be strictly controlled during the installation process to ensure the smooth progress of subsequent construction. Any deviation may cause structural instability or affect the quality of subsequent processes.

[0063] The connection between the frame beam and the steel truss, and between the steel secondary beam and the frame beam must be firm and reliable. The design and construction of the connection points should follow relevant specifications and technical standards to ensure the safety and durability of the entire floor structure.

[0064] Through such floor structure design and installation method, the stability and bearing capacity of large-span steel structure buildings can be effectively improved, while providing a solid foundation for the pouring of concrete floor slabs. In addition, the rational arrangement of floor steel beams 520 and steel secondary beams can also help optimize the load transfer path and reduce structural deformation, thereby reducing the risk of floor cracking. This method is not only suitable for newly built large-span steel structure buildings, but can also be considered for application in the reinforcement and renovation of existing buildings.

[0065] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the installation of the floor structure 500 on each floor includes:

[0066] The floor structure 500 includes a corrugated steel plate 510 and floor steel bars. The corrugated steel plate 510 is laid on each floor, and the floor steel bars are tied to the corrugated steel plate 510.

[0067] In these embodiments, the process of installing the floor structure 500 on each floor specifically includes laying a corrugated steel plate 510 and tying the floor reinforcement thereon. This method combines the advantages of steel structure and concrete structure, providing the convenience of rapid construction while ensuring that the floor has sufficient strength and rigidity. The corrugated steel plate 510 is used as a permanent formwork, not only supporting the subsequent pouring of concrete, but also becoming part of the floor after the concrete hardens, thereby increasing the integrity and bearing capacity of the floor.

[0068] The corrugated steel sheet 510 is usually laid on the steel secondary beam or the floor steel beam 520 according to the requirements of the design drawings. During installation, it is necessary to ensure the flatness and accurate position of the corrugated steel sheet 510 to ensure the quality of subsequent concrete pouring. The corrugated steel sheets 510 are fixed together by overlapping, welding or other connection methods, and are firmly connected to the steel beam to prevent displacement during the concrete pouring process.

[0069] Floor slab steel bars are key materials for enhancing the tensile strength of concrete. They work together with concrete to form a solid overall structure to resist the stress caused by loads.

[0070] On the laid corrugated steel sheet 510, the floor steel mesh is arranged and tied according to the design requirements. The specifications, spacing and arrangement of the steel bars should be strictly implemented in accordance with the design drawings to ensure that the requirements of structural safety performance are met.

[0071] After the steel bars are tied, it is also necessary to check whether their position is correct and whether the thickness of the protective layer meets the standards to avoid affecting the effect after concrete pouring.

[0072] Whether it is the laying of the corrugated steel sheet 510 or the tying of the floor slab reinforcement, the size and position accuracy must be strictly controlled to ensure that the final floor slab structure 500 meets the design requirements. The connection between the corrugated steel sheet 510 and the steel beam must be firm and reliable, and the reinforcement tying must comply with relevant specifications and technical standards to ensure the safety and durability of the entire floor slab structure 500. Appropriate safety protection measures must be taken when working at heights, such as setting up safety nets, wearing safety belts, etc., to ensure the personal safety of construction workers.

[0073] After the laying of corrugated steel plate 510 and the tying of floor reinforcement, a comprehensive quality inspection should be carried out to ensure that all details comply with the design and construction specifications and prepare for the subsequent concrete pouring.

[0074] Through such a design and installation method of the floor structure 500, the corrugated steel plate 510 is used as a permanent formwork, which reduces the time of setting up the traditional formwork and improves the construction efficiency. The composite floor slab formed by the corrugated steel plate 510 and concrete not only enhances the integrity and bearing capacity of the structure, but also effectively disperses the load and reduces local stress concentration. Reasonable steel bar configuration helps to control cracks caused by concrete shrinkage, especially in large-span steel structures, which is particularly important for preventing floor cracks.

[0075] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, before pouring concrete on the floor structure 500 of each floor in the vertical downward direction, the method further includes:

[0076] In the longitudinal span direction of the large-span steel truss 400, multiple core tubes 100 are arranged at intervals; wherein, a first post-cast joint 200 is arranged on the side of the outermost core tube 100 of each floor away from the middle of the floor, a second post-cast joint 300 is arranged on the side of the outermost core tube 100 of the uppermost floor close to the middle of the floor, and second post-cast joints 300 are respectively arranged on both sides of the core tube 100 of the middle of the uppermost floor, and the first post-cast joint 200 and the second post-cast joint 300 are arranged in parallel.

[0077] In these embodiments, before pouring concrete on the floor structure 500 of each floor in a vertical downward direction, a step of setting post-casting strips is also included. Specifically, these post-casting strips are arranged according to the layout of the long-span steel trusses 400 and the core tube 100 to optimize the structural performance and reduce the risk of cracks caused by factors such as temperature changes and shrinkage.

[0078] In the longitudinal span direction of the long-span steel truss 400, a plurality of core tubes 100 are arranged at intervals. As the main vertical structure in the building, the core tube 100 provides necessary support force and helps to disperse the load.

[0079] The first post-casting strip 200 is located at the outermost core tube 100, and the first post-casting strip 200 is arranged on the side of the outermost core tube 100 of each floor away from the middle of the floor. The first post-casting strip 200 is mainly used to alleviate the stress concentration caused by temperature change or early shrinkage of concrete, especially near the edge area, to prevent cracks caused by excessive stress.

[0080] The second post-cast strip 300 is located on the uppermost floor, and the uppermost floor is located on the side of the outermost core tube 100 close to the middle of the floor. The uppermost floor is located on both sides of the middle core tube 100 and is respectively provided with second post-cast strips 300. The function of the second post-cast strip 300 is to further disperse the stress, especially at the top of the building, which is subject to large temperature changes and self-weight loads. By setting post-cast strips at key locations, the probability of cracks can be effectively reduced and the integrity and durability of the structure can be ensured.

[0081] The first post-casting strip 200 and the second post-casting strip 300 are arranged in parallel to form an effective stress release network, which helps to evenly distribute stress and avoid stress concentration at a certain point.

[0082] Obviously, post-cast strips can effectively absorb and disperse stress caused by temperature changes, concrete shrinkage, etc., thereby significantly reducing the possibility of cracks. It allows concrete to be poured in stages, which not only helps control the construction progress, but also provides sufficient time for the concrete to harden and reduces the risks of one-time pouring. Properly set post-cast strips can help optimize the structural design, ensure good connection between the various parts, and thus improve the safety and stability of the entire building.

[0083] It should be determined according to the requirements of the specific project, ensuring sufficient space for placing steel bars and pouring concrete, while also ensuring that it will not affect the integrity of the overall structure.

[0084] The post-cast joint should be closed a certain period of time after the main structure is completed, usually after the concrete on both sides reaches a certain strength, to ensure that it can effectively play the role of stress release.

[0085] In addition, the concrete used to fill the post-cast joint should have good shrinkage compensation properties, such as micro-expansive concrete, to ensure good bonding between it and the original concrete.

[0086] In summary, by properly setting up post-casting strips in large-span steel structure buildings, the quality of concrete floor slabs can be greatly improved, the risk of cracks can be reduced, and it can also help optimize the construction process and improve work efficiency. This practice is particularly suitable for high-rise or large-span buildings, providing valuable practical experience and technical support for similar projects.

[0087] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the width of the first post-casting strip 200 is L1, and satisfies: 1.9m≤L1≤2.1m;

[0088] The width of the second post-casting strip 300 is L2, and satisfies: 1.9m≤L2≤2.1m.

[0089] In these embodiments, the width of the post-cast strip is directly related to its stress release effect. If it is too narrow, it may not be able to effectively absorb and disperse the stress caused by factors such as temperature changes and concrete shrinkage; if it is too wide, it will increase the difficulty of construction and may affect the integrity of the structure. Obviously, the appropriate width range can ensure a good stress release effect without causing unnecessary complexity to the construction.

[0090] For example, in this embodiment, the width of the first post-casting strip 200 is 2 m. In other embodiments, the width of the first post-casting strip 200 is 1.9 m, 2 m, or 2.1 m, etc.

[0091] For example, in this embodiment, the width of the second post-casting strip 300 is 2 m. In other embodiments, the width of the second post-casting strip 300 is 1.9 m, 2 m, or 2.1 m, etc.

[0092] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, pouring concrete onto the floor structure 500 of each floor includes:

[0093] pouring concrete into the area of ​​the outermost core tube 100 on the side away from the middle of the floor;

[0094] The area between adjacent core tubes 100 is divided into two construction areas in the transverse span direction, and the two construction areas are constructed and poured with concrete at the same time;

[0095] Concrete is poured into the areas on both sides of the outermost core tube 100 of the floor structure 500 in the transverse span direction.

[0096] In these embodiments, the process of pouring concrete on the floor structure 500 of each floor is further refined into specific steps and area divisions. This method aims to optimize the construction process, ensure the quality of concrete pouring, and effectively manage the deformation caused by the increase of deadweight.

[0097] The specific steps of concrete pouring are as follows:

[0098] 1. The area of ​​the outermost core tube 100 away from the middle of the floor;

[0099] Operation: First, concrete is poured into the area of ​​the outermost core tube 100 on the side away from the middle of the floor.

[0100] Purpose: This side is usually where stress is more concentrated. Prioritizing pouring can stabilize this part of the structure as early as possible and reduce the impact of subsequent construction.

[0101] 2. The area between adjacent core tubes 100;

[0102] Operation: The area between adjacent core tubes 100 is divided into two construction areas in the transverse span direction, and concrete pouring is carried out in these two construction areas at the same time.

[0103] Purpose:

[0104] Balanced load distribution: By constructing two areas simultaneously, the load distribution can be balanced to a certain extent, avoiding structural tilt or uneven settlement caused by unilateral loading.

[0105] Improve efficiency: Simultaneous construction can speed up the overall progress and shorten the pouring time of the entire floor.

[0106] Reduce deformation risk: Pouring in different areas simultaneously helps to control deformation of each part and prevent local stress concentration caused by gradual increase in load.

[0107] 3. The area on both sides of the outermost core tube 100;

[0108] Operation: Finally, concrete is poured into the areas on both sides of the outermost core tube 100 of the floor structure 500 in the transverse span direction.

[0109] Purpose: To ensure the structural integrity of the area around the outermost core tube 100, enhance the bearing capacity of the edge part, and further consolidate the stability of the entire floor.

[0110] It should be noted that for the two construction areas separated by adjacent core tubes 100, it should be ensured that the concrete pouring is carried out as synchronously as possible to maintain the overall balance of the structure. In addition, the concrete pouring process should be kept continuous as much as possible to avoid long-term interruption to avoid the formation of cold joints, which will affect the integrity and waterproof performance of the structure.

[0111] Therefore, through the above-mentioned method of zoning pouring, the pouring sequence is reasonably planned, the structural deformation is effectively controlled, and the risk of floor cracking is reduced. The simultaneous construction of different areas speeds up the construction progress and improves work efficiency. It ensures that each part of the structure is fully stabilized and enhances the integrity and durability of the building.

[0112] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, after pouring concrete on the floor structure 500 of each floor, the method further includes:

[0113] 28 days after pouring concrete on the floor structure 500 of each floor, a ballast material 600 is piled in a designated area on the floor structure 500, the ballast material 600 being equivalent to subsequent building materials, and the load of the ballast material 600 does not exceed the maximum design load of the floor structure 500;

[0114] Concrete is poured into the first post-casting strip 200 and the second post-casting strip 300 .

[0115] In these embodiments, after pouring concrete on the floor structure 500 of each floor, the following steps are further included:

[0116] Stacking of 600 weight materials

[0117] 1. Time Selection

[0118] After 28 days: After the concrete pouring on the floor structure 500 is completed and cured for 28 days, the counterweight material 600 is piled up. This period of time is to ensure that the concrete has reached sufficient strength to withstand subsequent loads.

[0119] 2. Stack 600 ballast weight materials in designated area

[0120] Position: The ballast material 600 is stacked in designated areas on the floor structure 500. The selection of these areas should be based on design requirements and structural analysis, usually in parts with less stress or requiring early loading verification. For example, the designated area is the placement location or construction location of subsequent building materials.

[0121] Equivalence: The counterweight material 600 should be equivalent to the subsequent building materials, that is, its density, weight distribution and other characteristics should be as close as possible to the actual building materials used, so as to more accurately simulate the load conditions under the final use state.

[0122] Load limit: The load of the counterweight material 600 should not exceed the maximum design load of the floor structure 500 to avoid unnecessary pressure or damage to the structure. The specific value needs to be determined according to the design documents, and the total load during the stacking process must be strictly monitored.

[0123] Construction of the first post-casting strip 200 and the second post-casting strip 300

[0124] 3. Post-casting belt construction

[0125] Time schedule: After the concrete on the floor structure 500 reaches the design strength (usually 28 days) and the counterweight material 600 has been piled up as required, the pouring of concrete into the first post-casting joint 200 and the second post-casting joint 300 begins.

[0126] effect:

[0127] Stress release: Closing the post-cast joint at this time can further absorb and disperse the stress caused by temperature changes, concrete shrinkage and other factors, reducing the risk of cracks.

[0128] Structural integrity: By filling the post-cast joints, the integrity and rigidity of the structure can be enhanced, ensuring good connections between the parts and improving the safety and durability of the building.

[0129] Through the above method, the weight material 600 is reasonably set and the post-casting strip is closed in time, which effectively controls the deformation of the structure and significantly reduces the risk of cracking of the floor. It ensures that the floor structure 500 is fully stabilized before bearing the actual load, which enhances the integrity and durability of the building. Furthermore, by simulating the actual use state through the weight material 600, potential problems can be discovered at an early stage, and the design plan or construction process can be adjusted in time to ensure the safety and reliability of the final structure.

[0130] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the floor structure 500 of each floor includes a plurality of sub-plates 530 , and the plurality of sub-plates 530 are arranged in sequence in the longitudinal span direction, and adjacent sub-plates 530 are connected by pull-out resistant but non-shear resistant studs 700 .

[0131] In these embodiments, the floor structure 500 of each floor is designed to include a plurality of sub-panels 530, which are arranged sequentially in the longitudinal span direction, and adjacent sub-panels 530 are connected by pull-out resistant but non-shear resistant studs 700 (commonly referred to as studs or shear studs).

[0132] The division of the sub-slab 530 also helps to optimize the load distribution and reduce the stress concentration problem that may be caused by large-sized floor slabs.

[0133] The main function of the studs is to provide vertical pull-out resistance to prevent the sub-slab 530 from separating when subjected to upward pulling force. This helps to enhance the integrity of the floor slab, especially when subjected to vertical loads.

[0134] Since the studs themselves do not have strong shear resistance, they will not significantly affect the sliding in the horizontal direction and allow a certain degree of relative displacement, thereby reducing the stress accumulation caused by temperature changes or concrete shrinkage.

[0135] The studs are usually burned through the corrugated steel plate 510 and welded to the steel beam, and then concrete is poured around them so that the studs are embedded in the concrete and form a composite structure with the concrete. This ensures good bonding between the studs and the concrete and gives full play to their pull-out resistance.

[0136] Obviously, through the bolt connection, adjacent sub-slabs 530 form a tightly connected whole, which enhances the bearing capacity and rigidity of the floor slab. Reasonable division of sub-slabs 530 and connection method of pull-out-resistant but not shear-resistant bolts 700 help to evenly distribute stress and avoid cracks caused by excessive local stress.

[0137] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, a thickened corrugated steel plate 510 is provided in the stress concentration area of ​​the floor structure 500, and the number of reinforcements of the floor steel bars is increased.

[0138] In these embodiments, thickened corrugated steel plates 510 are provided in stress concentration areas of the floor structure 500 and the number of reinforcements of the floor steel bars is increased, in order to enhance the bearing capacity and crack resistance of these key locations.

[0139] Among them, stress concentration areas include but are not limited to beam-column nodes, vicinity of support points, large-span sections and other places where stress concentration is prone to occur.

[0140] Thickened corrugated steel sheets 510 can significantly increase the rigidity and local strength of these areas, reduce deformation, and thus better withstand loads. Thicker corrugated steel sheets 510 not only enhance their own strength, but also strengthen the bond between the concrete and the steel structure, improving the integrity and durability of the floor slab. And, by providing stronger support, thickened corrugated steel sheets 510 help disperse stress and reduce the risk of cracks caused by stress concentration.

[0141] Increasing the number of floor slab reinforcement in stress concentration areas usually adopts a denser layout to ensure that there are more reinforcements in the same unit area. According to the design requirements, the appropriate diameter and spacing of the reinforcement are selected to ensure that the additional reinforcement can play an effective role without being too dense to affect the construction or concrete pouring quality.

[0142] The main function of steel bars is to resist tensile stresses caused by concrete shrinkage and temperature changes. Increasing the amount of reinforcement can significantly increase the tensile capacity of these areas and prevent cracks from forming. Proper reinforcement configuration helps to evenly distribute stresses, avoid excessive local stresses, and ensure that the floor slab maintains good performance under various loading conditions. More steel bars can also increase the ductility of the floor slab, allowing it to better adapt to deformation when subjected to stress and less prone to brittle failure.

[0143] like Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, a plurality of core tubes 100 are arranged at intervals in the transverse span direction.

[0144] In these embodiments, multiple core tubes 100 are arranged at intervals in the transverse span direction. This design is intended to optimize the overall structural performance of the building, especially in large-span steel structure buildings, by properly arranging the core tubes 100, the load can be effectively dispersed, the structural stability can be enhanced, and better earthquake resistance can be provided.

[0145] In the horizontal span direction of the building, multiple core tubes 100 are arranged at a certain interval. These core tubes 100 usually contain vertical transportation and facilities such as elevator shafts, stairwells, equipment pipelines, etc. By reasonably distributing the core tubes 100, the load can be distributed more evenly across the entire width of the building, reducing local stress concentration and improving the overall rigidity and stability of the structure.

[0146] Furthermore, by arranging a plurality of core tubes 100 in the transverse span direction, the free span of the floor slab can be effectively shortened, thereby reducing the flexural deformation of the floor slab and lowering the risk of cracks.

[0147] like Figure 1 As shown, in some embodiments, the present application also provides a large-span steel structure building, which uses the construction method of the large-span steel structure concrete floor as described in any of the above embodiments.

[0148] Since the construction method of the large-span steel structure concrete floor has the above-mentioned technical effects, the large-span steel structure building using the construction method of the large-span steel structure concrete floor should also have the above-mentioned effects.

[0149] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0150] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0151] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A construction method for a large-span steel structure concrete floor, characterized in that: The construction method of the large-span steel structure concrete floor comprises: Install long-span steel trusses at preset locations on the core tube; In the vertical upward direction, the floor structure is sequentially installed between the long-span steel trusses to divide the floors; and, in the vertical upward direction, the floor structure is sequentially installed on each of the floors; In a vertical downward direction, concrete is poured onto the floor structure of each of the floors in sequence.

2. The construction method of the large-span steel structure concrete floor according to claim 1 is characterized in that: The installation of the floor structure between the long-span steel trusses comprises: The floor structure includes floor steel beams, which are installed between the long-span steel trusses; The step of installing the floor structure on each floor comprises: The floor structure includes corrugated steel plates and floor steel bars. The corrugated steel plates are laid on each floor, and the floor steel bars are tied to the corrugated steel plates.

3. The construction method of the large-span steel structure concrete floor according to claim 2 is characterized in that: Before pouring concrete on the floor structure of each floor in sequence in the vertical downward direction, the method further includes: In the longitudinal span direction of the large-span steel truss, multiple core tubes are arranged at intervals; wherein, a first post-cast strip is arranged on the side of the outermost core tube of each floor away from the middle of the floor, a second post-cast strip is arranged on the side of the outermost core tube of the uppermost floor close to the middle of the floor, and second post-cast strips are respectively arranged on both sides of the core tube of the middle of the uppermost floor, and the first post-cast strip and the second post-cast strip are arranged in parallel.

4. The construction method of the large-span steel structure concrete floor according to claim 3 is characterized in that: The width of the first post-casting strip is L1, and satisfies: 1.9m≤L1≤2.1m; And / or, the width of the second post-cast strip is L2, and satisfies: 1.9m≤L2≤2.1m.

5. The construction method of the large-span steel structure concrete floor according to claim 3 is characterized in that: The pouring of concrete on the floor structure of each floor comprises: pouring concrete into the area of ​​the outermost core tube on the side away from the middle of the floor; The area between adjacent core tubes is divided into two construction areas in the transverse span direction, and the two construction areas are constructed and poured with concrete at the same time; Concrete is poured into the areas on both sides of the outermost core tube of the floor structure in the transverse span direction.

6. The construction method of the large-span steel structure concrete floor according to claim 5 is characterized in that: After pouring concrete on the floor structure of each floor, the method further comprises: 28 days after pouring concrete on the floor structure of each floor, stacking ballast materials in designated areas on the floor structure, the ballast materials being equivalent to subsequent building materials, and the load of the ballast materials not exceeding the maximum design load of the floor structure; Concrete is poured into the first post-casting zone and the second post-casting zone.

7. The construction method of the large-span steel structure concrete floor according to claim 3 is characterized in that: The floor structure of each floor includes a plurality of sub-slabs, which are arranged in sequence in the longitudinal span direction, and adjacent sub-slabs are connected by pull-out-resistant but not shear-resistant bolts.

8. The construction method of the large-span steel structure concrete floor according to claim 2 is characterized in that: In the stress concentration area of ​​the floor structure, the corrugated steel plate is thickened and the number of reinforcements of the floor steel bars is increased.

9. The construction method of the large-span steel structure concrete floor according to claim 1, characterized in that: In the transverse span direction, a plurality of core tubes are arranged at intervals.

10. A large-span steel structure building, characterized in that: The large-span steel structure building applies the construction method of the large-span steel structure concrete floor as described in any one of claims 1 to 9.

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