Fabricated crossed hollow beam building floor structure

Abstract

The utility model discloses an assembly type crossed hollow beam building floor structure, and belongs to the technical field of building structure engineering. The structure comprises a plurality of columns and crossed hollow grid beams, every two adjacent columns in the columns are connected through a precast beam, all the columns and all the precast beams jointly define a rectangular frame, the crossed hollow grid beams are located in the rectangular frame and connected with the columns and the precast beams, and the hollow grid beams are arranged in grids of the crossed hollow grid beams. Prefabricated unit plates are arranged in grids defined by the crossed hollow grid beams, the columns and the prefabricated beams, and cast-in-place floor slabs are arranged on the columns, the prefabricated beams, the crossed hollow grid beams and the prefabricated unit plates jointly. The method can be suitable for large-span public buildings or industrial plants; in the construction process of columns, prefabricated beams, crossed hollow grid beams and prefabricated unit plates, temporary supports such as steel corner connectors do not need to be additionally arranged and dismantled, steel bars do not need to be additionally arranged either, and the construction efficiency is remarkably improved.

Description

Technical Field

[0001] The utility model relates to an assembled cross hollow beam building floor structure, belonging to the technical field of building structure engineering. Background Art

[0002] In recent years, the country has vigorously promoted prefabricated buildings, striving to achieve integrated design, and actively promoting standardized, integrated, modular, factory-based construction and fully assembled construction methods.

[0003] Concrete cross hollow beams are mainly used in civil residential buildings, large-span public buildings or industrial plants. Existing concrete cross hollow beam construction is mostly cast on site, mainly divided into one or more castings. One-time casting has high requirements on the fluidity of concrete and the construction of the lower suspension beam position of the cross hollow beam is very difficult; multiple castings will affect the short column and the upper suspension beam reinforcement. The cross hollow beam structure is relatively complex. Since the lower suspension beam of the cross hollow beam is a large-span frame beam structure, the height of the short column is relatively prominent, and it is blocked by the hollow belly position so that it does not have a construction working surface. The two casting methods will affect the cross hollow beam to varying degrees in terms of construction period and structural bearing capacity. The traditional cast-in-place construction process has great constraints on the promotion and application of concrete cross hollow beam buildings, and the construction quality is also affected to a certain extent.

[0004] The Chinese patent document with publication number CN114382172A discloses a fully assembled building and a construction method thereof, wherein the foundation of the fully assembled building is connected to the prefabricated column by a grouting sleeve process; the floor slab overlap area is prefabricated on both sides of the prefabricated layer of the prefabricated composite beam; the prefabricated overlap support is prefabricated at the connection of the prefabricated composite beam of the prefabricated floor slab; the two ends of the prefabricated beam are respectively connected to the prefabricated column, and the beam surface reinforcement and beam structure reinforcement of the prefabricated beam are respectively extended into the top of the prefabricated column and connected with the prefabricated column. The structural steel bars of the columns are connected in a crisscross pattern; the precast floor slabs are overlapped in the floor slab overlap area of ​​the precast beams through the overlapped support, and the structural steel bars of the precast floor slabs extend into the cast-in-place layer of the precast beams and are crisscrossed with the stirrups and beam surface bars in the cast-in-place layer; the tongue and groove and post-casting strips are symmetrically arranged on the side of the joints of adjacent precast floor slabs, and additional steel bars extending into the cast-in-place layer of the adjacent precast beams are placed in the post-casting strips; the cast-in-place layer of the precast beams, the connection nodes between the precast beams and the precast columns, and the post-casting strips are cast-in-place. The production is simple and the assembly is fast.

[0005] However, the fully assembled building and its construction method have the following shortcomings:

[0006] First, all prefabricated beams are concrete solid beams, not concrete cross hollow beams, and have a small span, which makes the fully prefabricated building unsuitable for large-span public buildings or industrial plants.

[0007] Second, the precast beams and precast columns are disconnected at the connection nodes. Before construction, steel angle codes are needed as temporary supports, and the steel angle codes are connected to the precast columns and precast beams respectively with screws. After the cast-in-place concrete construction is completed, the steel angle codes and screws need to be removed. In addition, after the precast beams and precast columns are connected, it is necessary to add beam reinforcement on-site on the precast beams, and the beam reinforcement is criss-crossed with the column structural steel bars, and connected to the stirrups reserved on the precast beams as a whole. These factors will lead to a significant reduction in construction efficiency, and the construction quality is difficult to guarantee.

[0008] Third, it is necessary to add additional steel bars in the post-cast strips at the joints of adjacent precast slabs. The additional steel bars include additional structural steel bars placed close to the tongue-and-groove platform of the precast slabs, additional plate surface bars placed close to the upper surface of the post-cast strips, and hook steel bars placed at intervals of 200mm to 600mm along the length of the post-cast strips, which further reduces the construction efficiency. Utility Model Content

[0009] In order to solve the above technical problems, the utility model provides an assembled cross hollow beam building floor structure.

[0010] The utility model is realized through the following technical solutions:

[0011] An assembled cross hollow beam building floor structure comprises a plurality of columns and cross hollow grid beams, wherein two adjacent columns among the plurality of columns are connected by precast beams, and all the columns and all the precast beams together form a rectangular frame, the cross hollow grid beams are located in the rectangular frame and are connected to the columns and the precast beams, precast unit plates are arranged in the grids of the cross hollow grid beams and in the grids formed by the cross hollow grid beams, the columns and the precast beams, and cast-in-place floor slabs are arranged on the columns, precast beams, cross hollow grid beams and precast unit plates.

[0012] The column comprises a cast-in-place base and a prefabricated column. The prefabricated column is located on the upper side of the cast-in-place base and is connected to the cast-in-place base through a cast-in-place column section.

[0013] The cast-in-place base includes a column foundation and a cast-in-place middle column section, the lower end of the cast-in-place middle column section is connected to the column foundation, and the upper end is provided with a cast-in-place middle column outwardly extending longitudinal reinforcement;

[0014] The prefabricated column comprises a prefabricated center column section, both ends of the prefabricated center column section are provided with prefabricated center column outwardly extending longitudinal reinforcement, and a plurality of prefabricated solid web beams are provided at the same elevation on the prefabricated center column section, and the prefabricated solid web beam is provided with a prefabricated solid web beam outwardly extending longitudinal reinforcement at one end away from the prefabricated center column section;

[0015] After the prefabricated center column outwardly extending longitudinal reinforcement at one end of the prefabricated center column section is connected to the cast-in-place center column outwardly extending longitudinal reinforcement on the cast-in-place center column section through the connector A, the connection section between the prefabricated center column section and the cast-in-place center column section is cast-in-place concrete to form a cast-in-place column section;

[0016] The column cast-in-place section is located at the inflection point of the column.

[0017] The prefabricated center column section is provided with one, two or three prefabricated solid web beams at the same elevation, and the prefabricated solid web beams are located below the upper end surface of the prefabricated center column section;

[0018] The top of the prefabricated solid web beam is pre-embedded with beam-slab connecting ribs A, the exposed portion of the beam-slab connecting ribs A is in an inverted V shape, and the exposed height of the beam-slab connecting ribs A differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer;

[0019] The free ends of the cast-in-situ center column outwardly extending longitudinal reinforcement, the prefabricated center column outwardly extending longitudinal reinforcement and the prefabricated solid web beam outwardly extending longitudinal reinforcement are all provided with external threads;

[0020] The connecting member A is a sleeve.

[0021] Both ends of the precast beam are also connected to the column through the beam-column cast-in-place section B, and the middle part of the precast beam is also connected to the cross hollow grid beam through the beam ex-cast section B.

[0022] The prefabricated beam comprises a solid beam body, and both ends of the solid beam body are provided with solid beam outwardly extending longitudinal reinforcements, one or two groups of suspension beam components are provided at the same elevation on the solid beam body, and when two groups of suspension beam components are provided on the solid beam body, the two groups of suspension beam components are symmetrically arranged on both sides of the solid beam body.

[0023] The suspension beam assembly includes two lower suspension beams A and two upper suspension beams A. The two lower suspension beams A are arranged side by side and at the same elevation. One end of the two lower suspension beams A is connected to the same side of the solid beam body, and the free ends of the two lower suspension beams A are provided with lower suspension beam extending longitudinal reinforcement A. The two upper suspension beams A are arranged side by side and at the same elevation. One end of the two upper suspension beams A is connected to the solid beam body. The two upper suspension beams A are arranged one by one directly above the two lower suspension beams A, and the top surface of the upper suspension beam A is coplanar with the top surface of the solid beam body, and the free ends of the two upper suspension beams A are provided with upper suspension beam extending longitudinal reinforcement A.

[0024] The top surface of the solid beam body and the top surface of the upper cantilever beam A are both pre-embedded with beam-slab connecting ribs B, the exposed portion of the beam-slab connecting ribs B is in an inverted V shape, and the exposed height of the beam-slab connecting ribs B differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer;

[0025] The free ends of the extended longitudinal bars of the solid beam, the extended longitudinal bars A of the upper cantilever beam and the extended longitudinal bars A of the lower cantilever beam are all provided with external threads.

[0026] The cross hollow grid beam comprises a plurality of cross hollow beam prefabricated units, and two adjacent cross hollow beam prefabricated units among the plurality of cross hollow beam prefabricated units are connected via a cantilever beam cast-in-place section.

[0027] The cross hollow beam prefabrication unit comprises two cross-shaped short columns, the four free ends of the two cross-shaped short columns are provided with lower suspension beams B and upper suspension beams B side by side, and the upper suspension beams B are located directly above the lower suspension beams B, the two cross-shaped short columns are symmetrically arranged, and the lower suspension beams B and upper suspension beams B at one end of one of the cross-shaped short columns are directly connected one by one with the lower suspension beams B and upper suspension beams B at one end of the other cross-shaped short column during the prefabrication process;

[0028] The free end of the lower suspension beam B is provided with a lower suspension beam outwardly extending longitudinal reinforcement B, the free end of the upper suspension beam B is provided with an upper suspension beam outwardly extending longitudinal reinforcement B, and the free ends of the lower suspension beam outwardly extending longitudinal reinforcement B and the upper suspension beam outwardly extending longitudinal reinforcement B are both provided with external threads.

[0029] The top surface of the upper cantilever beam B is coplanar with the upper end surface of the cross-shaped short column, the bottom surface of the lower cantilever beam B is coplanar with the lower end surface of the cross-shaped short column, and the top surface of the upper cantilever beam B is pre-embedded with beam-slab connecting reinforcement C. The exposed part of the beam-slab connecting reinforcement C is in an inverted V shape, and the exposed height of the beam-slab connecting reinforcement C differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer.

[0030] Concrete is filled between the lower suspension beam B and the upper suspension beam B at one longitudinal end of the cross hollow beam prefabricated unit to form a solid cantilever beam, and the solid cantilever beam is connected to the column through the beam-column cast-in-place section A.

[0031] Floor slab connecting ribs are reserved around the four sides and the top surface of the prefabricated unit slab.

[0032] The beneficial effects of the utility model are:

[0033] 1. All columns and all prefabricated beams on the same floor together form a rectangular frame, and cross hollow grid beams are installed in the rectangular frame. Since the cross hollow grid beam structure has a strong bearing capacity, the assembled cross hollow beam building floor structure can be suitable for large-span public buildings or industrial plants. During the connection and installation of columns, prefabricated beams, cross hollow grid beams and prefabricated unit panels, there is no need to add or remove temporary supports such as steel angle codes, nor is there any need to add steel bars at the construction site, which significantly improves the construction efficiency of the assembled cross hollow beam building floor structure.

[0034] 2. Prefabricated center column sections and prefabricated solid beams can be cast in a mold at one time. The connection nodes of the prefabricated center column sections and prefabricated solid beams are prefabricated in the factory. Compared with the existing prefabricated column components, the complex beam-column nodes are incorporated into the factory prefabrication, which solves the problems of on-site casting and vibration difficulties due to the large number of steel bars at the nodes. The node quality is more guaranteed, the nodes are safer and more reliable, and it can also save resources and reduce construction costs.

[0035] 3. The outward extending longitudinal reinforcement A of the lower cantilever beam is used to realize mechanical connection with the outward extending longitudinal reinforcement B of the lower cantilever beam through a sleeve. The outward extending longitudinal reinforcement A of the upper cantilever beam is used to realize mechanical connection with the outward extending longitudinal reinforcement B of the upper cantilever beam through a sleeve. After the mechanical connection is realized through the sleeve, concrete is poured into the gap between the outward extending longitudinal reinforcements of the cantilever beam. The construction is quick and the quality can be guaranteed.

[0036] 4. The solid beam body, lower suspension beam A and upper suspension beam A can be cast in the mold at one time. The upper suspension beam A, lower suspension beam A and the connection nodes with the solid beam body are manufactured and processed in the factory. Compared with the existing prefabricated composite beam components, the complex beam-beam connections are included in the factory prefabrication, which can not only ensure the quality of the structural nodes, but also speed up the on-site construction progress and improve the construction efficiency.

[0037] 5. The cross-shaped short column is included in the beam as a whole. There is no splicing or cast-in-place concrete at the cross-shaped short column. The cross hollow beam prefabricated unit has a stable structure, good shear resistance, strong bearing capacity, and can meet the needs of large-span buildings. The cross hollow beam prefabricated unit is produced in batches according to factory standards, with good quality and fast processing. It will not disturb other prefabricated components during installation, which improves the quality of the cross hollow grid beam. The cross hollow beam prefabricated unit can be prefabricated in advance as needed and directly installed after being transported to the construction site, which greatly shortens its production and installation cycle, and also greatly reduces on-site cast-in-place wet operations, which has better environmental benefits and saves manpower and material resources.

[0038] 6. The cross hollow beam prefabricated unit can be cast in the mold at one time, and the two cross-shaped short columns are manufactured and processed in the factory. Compared with the traditional concrete prefabricated components, the complex beam-beam connection is included in the factory prefabrication, and the quality is more guaranteed. Compared with the traditional frame beam of the same height, the spanning capacity is better, that is, for the same span, the cross hollow beam prefabricated unit is smaller in height than the solid frame beam, which can gain a larger indoor clearance and make full use of the building space.

[0039] 7. The two cross-shaped short columns are manufactured and processed in the factory, which not only improves the structural stiffness of the cross hollow beam prefabricated unit, but also makes up for the loss of bending stiffness of the cross hollow beam prefabricated unit due to the reduction of height, and can also ensure the quality of the structural nodes; it solves the problems of loss of bending stiffness of the concrete cross hollow beam structure, difficulty in casting the nodes, and uneven quality of various components caused by on-site casting.

[0040] 8. Rectangular hollow spaces are left inside the cross hollow beam prefabricated units and between adjacent cross hollow beam prefabricated units, which can save a lot of building materials and save costs. In addition, rectangular hollow spaces can be used for pipeline installation, which can effectively shorten the construction period, reduce construction costs, and improve environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1It is a three-dimensional structural schematic diagram of the utility model;

[0042] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0043] Figure 3 This is a schematic diagram of the structure of the utility model when there are three prefabricated solid beams on the column;

[0044] Figure 4 It is a structural schematic diagram of the utility model when there are two prefabricated solid beams on the column;

[0045] Figure 5 It is a schematic diagram of the structure when there are 4 prefabricated solid beams on the column of the utility model;

[0046] Figure 6 It is a structural schematic diagram of the prefabricated beam of the utility model;

[0047] Figure 7 It is a structural schematic diagram of a cross hollow beam prefabricated unit of the utility model when a solid cantilever beam is provided on the cross hollow beam prefabricated unit;

[0048] Figure 8 This is a schematic structural diagram of a cross hollow beam prefabricated unit of the utility model;

[0049] Fig. 9 This is a schematic diagram of the assembly structure of the cross hollow grid beam and the prefabricated unit plate of the utility model;

[0050] Fig.10 It is a structural schematic diagram of the prefabricated unit board of the utility model.

[0051] In the figure: 1-column, 10-cast-in-place base, 100-column foundation, 101-cast-in-place middle column section, 102-cast-in-place middle column extending longitudinal reinforcement, 11-precast column, 110-precast middle column section, 111-precast middle column extending longitudinal reinforcement, 112-precast solid web beam, 113-precast solid web beam extending longitudinal reinforcement, 114-beam-slab connecting reinforcement A, 12-column cast-in-place section, 13-connector A;

[0052] 2- precast beam, 20- solid web beam body, 200- solid web beam extended longitudinal reinforcement, 21- cantilever beam assembly, 210- lower cantilever beam A, 211- upper cantilever beam A, 212- lower cantilever beam extended longitudinal reinforcement A, 213- upper cantilever beam extended longitudinal reinforcement A, 22- beam-slab connecting reinforcement B;

[0053] 3-cross hollow grid beam, 30-cross hollow beam prefabricated unit, 300-cross short column, 301-lower suspension beam B, 302-upper suspension beam B, 303-lower suspension beam extended longitudinal reinforcement B, 304-upper suspension beam extended longitudinal reinforcement B, 305-beam-slab connecting reinforcement C, 306-solid web cantilever beam, 307-beam-column cast-in-place section A, 31-suspended beam cast-in-place section;

[0054] 4-prefabricated unit slab, 40-floor slab connecting reinforcement;

[0055] 5- Beam and column cast-in-place section B;

[0056] 6-Beam body casting section B. DETAILED DESCRIPTION

[0057] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0058] Cross hollow beam structures are often used in large-span concrete structures. Since the concrete beam is hollow and the beam height is only 1 / 15~1 / 30 of the span, the beam structure height is significantly lower than the beam height of the traditional concrete structure (1 / 12~1 / 14), thereby increasing the effective net height of the room. At the same time, the floor structure of a large-span concrete cross hollow beam building can also be built into a multi-story or high-rise building, thus transforming the horizontal layout of the large-span concrete cross hollow beam building floors into vertical floors, which is the so-called "industrial floor-to-ceiling" concept. Not only can the building structure space be used more efficiently, but more importantly, a large amount of land can be saved, which can be greatly developed in the future construction field.

[0059] like Figures 1 to 10 As shown, the utility model describes an assembled cross hollow beam building floor structure, comprising a plurality of columns 1 and cross hollow grid beams 3, wherein two adjacent columns 1 among the plurality of columns 1 are connected by a precast beam 2, and all the columns 1 and all the precast beams 2 together form a rectangular frame, wherein the cross hollow grid beams 3 are located in the rectangular frame and are connected to the columns 1 and the precast beams 2, and precast unit panels 4 are arranged in the grids of the cross hollow grid beams 3 and in the grids formed by the cross hollow grid beams 3, the columns 1 and the precast beams 2, and cast-in-place floor slabs are arranged on the columns 1, the precast beams 2, the cross hollow grid beams 3 and the precast unit panels 4. When in use, all the columns 1 and all the prefabricated beams 2 on the same floor together form a rectangular frame, and the cross hollow grid beams 3 are installed in the rectangular frame. Since the cross hollow grid beams 3 have a strong structural bearing capacity, the assembled cross hollow beam building floor structure can be suitable for large-span public buildings or industrial factories; during the connection and installation of the columns 1, prefabricated beams 2, cross hollow grid beams 3 and prefabricated unit panels 4, there is no need to add or remove temporary supports such as steel angle codes, nor is there any need to add steel bars at the construction site, which significantly improves the construction efficiency of the assembled cross hollow beam building floor structure.

[0060] The column 1 includes a cast-in-place base 10 and a prefabricated column 11. The prefabricated column 11 is located on the upper side of the cast-in-place base 10 and is connected to the cast-in-place base 10 through a column cast-in-place section 12. The cast-in-place base 10 is formed by cast-in-place concrete, which ensures the support stability of the cast-in-place base 10. Compared with the traditional cast-in-place column 1, the prefabricated column 11 is prefabricated and processed in the factory in advance, and then hoisted on site to be spliced ​​with the cast-in-place base 10. The construction of the column 1 is convenient and efficient, reducing the operations of formwork, brackets, and cast-in-place, thereby effectively reducing the project cost. The column cast-in-place section 12 is used to wrap the prefabricated middle column extending longitudinal reinforcement 111, sleeve and cast-in-place middle column extending longitudinal reinforcement 102 at the lower end of the prefabricated middle column section 110, and realize the connection between the prefabricated column 11 and the cast-in-place base 10; the column cast-in-place section 12 is short, only a small amount of formwork is needed, saving formwork, and at the same time, there are fewer wet operations in cast-in-place and a short maintenance cycle, which is conducive to saving manpower and improving the construction efficiency of the assembled cross hollow beam building floor structure.

[0061] The cast-in-place base 10 comprises a column foundation 100 and a cast-in-place middle column section 101. The lower end of the cast-in-place middle column section 101 is connected to the column foundation 100, and the upper end is provided with a cast-in-place middle column extending longitudinal reinforcement 102.

[0062] The prefabricated column 11 comprises a prefabricated center column section 110, both ends of the prefabricated center column section 110 are provided with prefabricated center column outward longitudinal reinforcement 111, and a plurality of prefabricated solid web beams 112 are provided at the same height on the prefabricated center column section 110, and a prefabricated solid web beam outward longitudinal reinforcement 113 is provided on the end of the prefabricated solid web beam 112 away from the prefabricated center column section 110;

[0063] After the precast center column outward longitudinal reinforcement 111 at one end of the precast center column section 110 is connected to the cast-in-place center column outward longitudinal reinforcement 102 on the cast-in-place center column section 101 through the connector A13, the in-situ concrete is cast in the connection section between the precast center column section 110 and the cast-in-situ center column section 101 to form a column cast-in-situ section 12;

[0064] The column cast-in-place section 12 is located at the inflection point of the column 1 .

[0065] The prefabricated solid beam extended longitudinal reinforcement 113 on column 1 is used to connect with the solid beam extended longitudinal reinforcement 200 on prefabricated beam 2 through a sleeve, or to connect with the extended steel bars at the solid cantilever beam 306 on the cross hollow beam prefabricated unit 30, so that the assembly of column 1 with prefabricated beam 2 and cross hollow grid beam 3 is more convenient to quickly form an overall frame system. The column cast-in-place section 12 is located at the inflection point of column 1. After the prefabricated middle column extended longitudinal reinforcement 111 and the cast-in-place middle column extended longitudinal reinforcement 102 are mechanically connected through the sleeve, the column cast-in-place section 12 is cast-in-place with local formwork, which can not only better exert the compressive capacity of column 1, but also does not affect its bending performance.

[0066] The prefabricated center column section 110 is provided with 2, 3 or 4 prefabricated solid web beams 112 at the same elevation, and the prefabricated solid web beams 112 are located below the upper end surface of the prefabricated center column section 110;

[0067] The top of the prefabricated solid web beam 112 is pre-buried with beam-slab connecting ribs A114, the exposed portion of the beam-slab connecting ribs A114 is in an inverted V shape, and the exposed height of the beam-slab connecting ribs A114 differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer;

[0068] The free ends of the cast-in-situ center column outwardly extending longitudinal reinforcement 102, the prefabricated center column outwardly extending longitudinal reinforcement 111 and the prefabricated solid web beam outwardly extending longitudinal reinforcement 113 are all provided with external threads;

[0069] The connecting member A13 is a sleeve.

[0070] like Figure 4 As shown, when two prefabricated solid beams 112 are provided at the same height on the prefabricated center column section 110, and the two prefabricated solid beams 112 are perpendicular to each other, the prefabricated center column section 110 is assembled with the cast-in-place base 10 and used as a corner column. Figure 3 As shown, when three prefabricated solid beams 112 are provided at the same height on the prefabricated center column section 110, the prefabricated center column section 110 is assembled with the cast-in-place base 10 and used as a side center column. Figure 5 As shown, when four prefabricated solid beams 112 are provided at the same elevation on the prefabricated center column section 110, the prefabricated center column section 110 is assembled with the cast-in-place base 10 and used as the center column, and cross hollow grid beams 3 are installed on both sides of the center column.

[0071] The beam-slab connecting reinforcement A114 is embedded in the top of the prefabricated solid beam 112, which is convenient for quickly identifying the position of the prefabricated column 11 and for on-site hoisting of the prefabricated column 11. It can also connect the prefabricated solid beam 112 with the cast-in-place floor slab as a whole, thereby increasing the construction speed, shortening the construction period and reducing the construction cost.

[0072] The cast-in-place center column extending longitudinal reinforcement 102, the precast center column extending longitudinal reinforcement 111 and the precast solid web beam extending longitudinal reinforcement 113 are all stress-bearing steel bars, and the length of the external thread on each extending longitudinal reinforcement is determined according to the load shared by the corresponding component.

[0073] The publication number is CN114382172A, and the patent name is a prefabricated column component disclosed in a fully assembled building and its construction method. Only the column body is prefabricated in the factory, and the prefabricated column is vertically connected to the adjacent column segments with a grouting sleeve. It has high requirements for construction accuracy and grouting, and is difficult to install. The prefabricated columns and beams are connected on-site at the nodes, and then concrete is poured at the connections. However, the nodes are often more complicated, not only with dense steel bars, but also difficult on-site operations, making it difficult to ensure quality and slowing down the construction progress.

[0074] In the utility model, the prefabricated center column extending longitudinal reinforcement 111 at the lower end of the prefabricated center column section 110 is used to connect with the cast-in-place center column extending longitudinal reinforcement 102 through a sleeve, and can be quickly connected with the cast-in-place base 10, and then the connecting section between the cast-in-place base 10 and the prefabricated center column section 110 is cast in-situ concrete to form a column cast-in-situ section 12, so that the prefabricated center column section 110 is integrally connected with the cast-in-situ base 10; the prefabricated center column extending longitudinal reinforcement 111 at the upper end of the prefabricated center column section 110 is used to connect with the cast-in-situ base 10 of the upper column 1, thereby ensuring the structural integrity of the upper and lower floor columns 1, so that the column 1 has a good structural bearing capacity, while reducing the requirements of the column 1 on the construction accuracy, and the installation difficulty is small. The prefabricated center column section 110 and the prefabricated solid beam 112 can be cast in a mold at one time, and the connection nodes of the prefabricated center column section 110 and the prefabricated solid beam 112 are prefabricated in the factory. Compared with the existing prefabricated column components, the complex beam-column nodes are incorporated into the factory prefabrication, which solves the problems of on-site casting and vibration difficulties due to the large number of steel bars at the nodes. The node quality is more guaranteed, the nodes are safer and more reliable, and at the same time it can save resources and reduce construction costs.

[0075] The two ends of the precast beam 2 are also connected to the column 1 through the beam-column cast-in-place section B5, and the middle part of the precast beam 2 is also connected to the cross hollow grid beam 3 through the beam body cast-in-place section B6. The beam-column cast-in-place section B5 is used to wrap the solid web beam extending longitudinal reinforcement 200, the sleeve and the precast solid web beam extending longitudinal reinforcement 113 on the column 1, and realize the connection between the precast beam 2 and the column 1. The beam body cast-in-place section B6 is used to wrap the upper suspension beam extending longitudinal reinforcement A213, the sleeve and the upper suspension beam extending longitudinal reinforcement B304, or to wrap the lower suspension beam extending longitudinal reinforcement A212, the sleeve and the lower suspension beam extending longitudinal reinforcement B303, to realize the connection between the upper suspension beam A211 and the upper suspension beam B302, and the connection between the lower suspension beam A210 and the lower suspension beam B301. The cast-in-place section B5 of the beam-column and the cast-in-place section B6 of the beam body are reserved near the inflection point where the beam section is subjected to force, which not only ensures the construction quality at the connection point between beams, but also makes the on-site connection construction of the prefabricated connection more convenient, speeds up the construction progress and saves costs.

[0076] The prefabricated beam 2 comprises a solid beam body 20, and both ends of the solid beam body 20 are provided with solid beam outward longitudinal reinforcement 200, and one or two groups of suspension beam components 21 are provided at the same height on the solid beam body 20, and when two groups of suspension beam components 21 are provided on the solid beam body 20, the two groups of suspension beam components 21 are symmetrically arranged on both sides of the solid beam body 20. Figure 6 As shown, when a group of suspension beam components 21 are provided at the same elevation on the solid beam body 20, the precast beam 2 is used as a side beam; when two groups of suspension beam components 21 are provided at the same elevation on the solid beam body 20, the precast beam 2 is used as a middle beam (not shown in the figure), and both sides of the middle beam are equipped with cross hollow grid beams 3.

[0077] The suspension beam assembly 21 includes two lower suspension beams A210 and two upper suspension beams A211, the two lower suspension beams A210 are arranged side by side and at the same elevation, one end of the two lower suspension beams A210 is connected to the same side of the solid beam body 20, and the free ends of the two lower suspension beams A210 are provided with lower suspension beam outward longitudinal reinforcement A212, the two upper suspension beams A211 are arranged side by side and at the same elevation, one end of the two upper suspension beams A211 is connected to the solid beam body 20, the two upper suspension beams A211 are arranged one by one directly above the two lower suspension beams A210, and the top surface of the upper suspension beam A211 is coplanar with the top surface of the solid beam body 20, and the free ends of the two upper suspension beams A211 are provided with upper suspension beam outward longitudinal reinforcement A213. The bottom surface of the lower suspension beam A210 is flush with the bottom surface of the solid beam body 20 or not. The extended longitudinal bars 200 of the solid beam, the extended longitudinal bars A212 of the lower suspension beam and the extended longitudinal bars A213 of the upper suspension beam are all stress-bearing steel bars. The extended longitudinal bars A212 of the lower suspension beam are used to achieve mechanical connection with the extended longitudinal bars B303 of the lower suspension beam through a sleeve, and the extended longitudinal bars A213 of the upper suspension beam are used to achieve mechanical connection with the extended longitudinal bars B304 of the upper suspension beam through a sleeve. After the mechanical connection is achieved through the sleeve, concrete is poured into the gap between the extended longitudinal bars of the suspension beams. The construction is fast and the quality can be guaranteed. The solid beam body 20, the lower suspension beam A210 and the upper suspension beam A211 can be cast and formed in a mold at one time. The upper suspension beam A211, the lower suspension beam A210 and the connection nodes with the solid beam body 20 are manufactured and processed in the factory. Compared with the existing prefabricated composite beam components, the complex beam-beam connection is included in the factory prefabrication, which can not only ensure the quality of the structural nodes, but also speed up the on-site construction progress and improve the construction efficiency.

[0078] The top surface of the solid beam body 20 and the top surface of the upper suspension beam A211 are both pre-embedded with beam-slab connecting ribs B22, the exposed portion of the beam-slab connecting ribs B22 is in an inverted V shape, and the exposed height of the beam-slab connecting ribs B22 differs from the thickness of the cast-in-place floor slab by the thickness of the concrete protective layer;

[0079] The free ends of the solid beam outwardly extending longitudinal reinforcement 200, the upper cantilever beam outwardly extending longitudinal reinforcement A213 and the lower cantilever beam outwardly extending longitudinal reinforcement A212 are all provided with external threads.

[0080] The beam-slab connecting ribs B22 are located in the middle of the width direction of the top surface of the solid beam body 20, and are arranged at equal intervals along the length direction of the solid beam body 20; the beam-slab connecting ribs B22 are located in the middle of the width direction of the top surface of the upper suspension beam A211, and are arranged at equal intervals along the length direction of the solid beam body 20. The beam-slab connecting ribs B22 are pre-buried in the top of the solid beam body 20 and the upper suspension beam A211, which is convenient for quickly identifying the position of the precast beam 2, and convenient for on-site hoisting of the precast beam 2. It can also connect the solid beam body 20, the upper suspension beam A211 and the cast-in-place floor slab as a whole, which can improve the construction speed, shorten the construction period and reduce the construction cost.

[0081] The length of the external thread of the free ends of the extended longitudinal reinforcement 200 of the solid beam, the extended longitudinal reinforcement A213 of the upper cantilever beam and the extended longitudinal reinforcement A212 of the lower cantilever beam is determined according to the load shared by the components.

[0082] The cross hollow grid beam 3 includes a plurality of cross hollow beam prefabricated units 30, and two adjacent cross hollow beam prefabricated units 30 are connected by a cantilever beam cast-in-place section 31. The cantilever beam cast-in-place section 31 is used to wrap the upper cantilever beam outwardly extending longitudinal reinforcement B304 and sleeves in two adjacent cross hollow beam prefabricated units 30, and the lower cantilever beam outwardly extending longitudinal reinforcement B303 and sleeves in two adjacent cross hollow beam prefabricated units 30, and realize the connection of two adjacent upper cantilever beams B302 and two adjacent lower cantilever beams B301.

[0083] The cross hollow beam prefabricated unit 30 includes two cross-shaped short columns 300, and the four free ends of the two cross-shaped short columns 300 are provided with lower suspension beams B301 and upper suspension beams B302 side by side, and the upper suspension beams B302 are located directly above the lower suspension beams B301. The two cross-shaped short columns 300 are symmetrically arranged, and the lower suspension beams B301 and upper suspension beams B302 at one end of one cross-shaped short column 300 are directly connected one by one with the lower suspension beams B301 and upper suspension beams B302 at one end of the other cross-shaped short column 300 during the prefabrication process;

[0084] The free end of the lower suspension beam B301 is provided with a lower suspension beam extending longitudinal reinforcement B303, the free end of the upper suspension beam B302 is provided with an upper suspension beam extending longitudinal reinforcement B304, and the free ends of the lower suspension beam extending longitudinal reinforcement B303 and the upper suspension beam extending longitudinal reinforcement B304 are both provided with external threads.

[0085] The cross-shaped short column 300 is included in the beam as a whole. There is no splicing or cast-in-place concrete at the cross-shaped short column 300. The cross hollow beam prefabricated unit 30 has a stable structure, good shear resistance, strong bearing capacity, and can meet the needs of large-span buildings. The cross hollow beam prefabricated unit 30 is produced in batches according to factory standards, has good quality, fast processing, and will not disturb other prefabricated components during installation, which improves the quality of the cross hollow grid beam 3. The cross hollow beam prefabricated unit 30 can be prefabricated in advance as needed and directly installed after being transported to the construction site, which greatly shortens its production and installation cycle, and also greatly reduces on-site cast-in-place wet operations, which has better environmental benefits and saves more manpower and material resources.

[0086] The cross hollow grid beam 3 has less cast-in-place concrete in its overall structure and has stronger integrity.

[0087] The cross hollow beam prefabricated unit 30 can be cast in a mold at one time, and the two cross-shaped short columns 300 are manufactured and processed in the factory. Compared with traditional concrete prefabricated components, the complex beam-beam connections are included in the factory prefabrication, and the quality is more guaranteed. Compared with traditional frame beams of the same height, the spanning capacity is better, that is, for the same span, the cross hollow beam prefabricated unit 30 is smaller in height than the solid frame beam, which can gain a larger indoor clearance and make full use of the building space.

[0088] Manufacturing and processing the two cross-shaped short columns 300 in the factory not only improves the structural rigidity of the cross hollow beam prefabricated unit 30, but also makes up for the loss of bending rigidity of the cross hollow beam prefabricated unit 30 due to the reduction in height, and can also ensure the quality of the structural nodes; it solves the problems of loss of bending rigidity of the concrete cross hollow beam structure, difficulty in casting the nodes, and uneven quality of various components due to on-site casting.

[0089] Rectangular hollow spaces are provided inside the cross hollow beam prefabricated units 30 and between adjacent cross hollow beam prefabricated units 30, which can save a lot of building materials and save costs. In addition, the rectangular hollow spaces can be used for pipeline installation, which can effectively shorten the construction period, reduce construction costs, and improve environmental benefits.

[0090] The outward extending longitudinal reinforcement B303 of the lower cantilever beam and the outward extending longitudinal reinforcement B304 of the upper cantilever beam are both stress-bearing steel bars.

[0091] The top surface of the upper suspension beam B302 is coplanar with the upper end surface of the cross-shaped short column 300, the bottom surface of the lower suspension beam B301 is coplanar with the lower end surface of the cross-shaped short column 300, and the top surface of the upper suspension beam B302 is pre-embedded with beam-slab connecting ribs C305, the exposed portion of the beam-slab connecting ribs C305 is in an inverted V shape, and the exposed height of the beam-slab connecting ribs C305 differs from the thickness of the cast-in-place floor slab by a thickness of the concrete protective layer. The beam-slab connecting ribs C305 are pre-embedded on the top of the upper suspension beam B302, which is convenient for quickly identifying the orientation of the cross hollow beam prefabricated unit 30, and convenient for on-site hoisting of the cross hollow beam prefabricated unit 30, and can also connect the cross hollow beam prefabricated unit 30 with the cast-in-place floor slab as a whole, which can improve the construction speed, shorten the construction period, and reduce the construction cost.

[0092] The lower suspension beam B301 and the upper suspension beam B302 at one longitudinal end of the cross hollow beam prefabricated unit 30 are filled with concrete to form a solid cantilever beam 306, and the solid cantilever beam 306 is connected to the column 1 through the beam-column cast-in-place section A307.

[0093] One longitudinal end of the cross hollow beam prefabricated unit 30 is made into a solid cantilever beam 306. Compared with the combination of the lower cantilever beam B301 and the upper cantilever beam B302, the solid cantilever beam 306 has improved overall stiffness and bearing capacity. The cantilever beam extending longitudinal reinforcement at the solid cantilever beam 306 is connected to the prefabricated solid beam extending longitudinal reinforcement 113 at the prefabricated solid beam 112 on the column 1 through a sleeve, which can further improve the overall stiffness of the connection between the solid cantilever beam 306 and the prefabricated solid beam 112. Finally, after support, local cast-in-place concrete is used to connect the solid cantilever beam 306 and the prefabricated solid beam 112 to compensate for the problem of overall bending stiffness loss of the cross hollow grid beam 3 due to the reduced height.

[0094] The prefabricated unit plate 4 is provided with floor connection ribs 40 on the four sides and the top surface. The concrete floor consists of a lower plate and an upper plate; the lower plate is a prefabricated unit plate 4 prefabricated according to the grid size of the cross hollow grid beam 3, and the prefabricated unit plate 4 is provided with floor connection ribs 40 on the four sides and the top surface; the upper plate is a cast-in-place floor plate cast in situ with the lower plate as the bottom formwork and a single layer of stress-bearing steel bars; the concrete floor plate is formed by the upper cast-in-place floor plate and the lower prefabricated unit plate 4 being tightly connected through the floor connection ribs 40 and the concrete between the plates, which is innovatively and significantly different from the traditional structural assembly, and realizes assembly and construction at or near the midpoint of the floor grid.

[0095] A method for constructing an assembled cross hollow beam building floor structure comprises the following steps:

[0096] Step 1, construction of column 1: construct the cast-in-place base 10 of column 1, hoist the prefabricated prefabricated column 11 in the factory to the cast-in-place base 10, and connect the prefabricated middle column outer longitudinal reinforcement 111 at one end of the prefabricated middle column section 110 with the cast-in-place middle column outer longitudinal reinforcement 102 on the cast-in-place middle column section 101 through a sleeve, position and correct the prefabricated column 11, and then use a formwork to cast concrete in the connection section between the prefabricated middle column section 110 and the cast-in-place middle column section 101 to form a column cast-in-place section 12;

[0097] Step 2, preliminary construction of precast beam 2 and cross hollow grid beam 3: hoist the precast beam 2 and cross hollow beam precast unit 30 prefabricated in the factory to the designed position, and set up support frames to support the intersection of the solid web beam main body 20 and the lower suspension beam A210 in the precast beam 2, and the lower end surface of the cross short column 300 of the cross hollow beam precast unit 30, respectively, connect the solid web beam extended longitudinal reinforcement 200 on the precast beam 2 with the precast solid web beam extended longitudinal reinforcement 113 on the column 1 through sleeves, and connect the upper suspension beam extended longitudinal reinforcement A213 on the precast beam 2 with the upper suspension beam extended longitudinal reinforcement A213 on the cross hollow beam precast unit 30 The longitudinal reinforcement B304 is connected, the lower cantilever beam outward longitudinal reinforcement A212 on the precast beam 2 is connected with the lower cantilever beam outward longitudinal reinforcement B303 on the cross hollow beam precast unit 30, the outward longitudinal reinforcement at the solid web cantilever beam 306 on the cross hollow beam precast unit 30 is connected with the precast solid web beam outward longitudinal reinforcement 113 on the column 1, the precast beam 2 and the cross hollow beam precast unit 30 are positioned and corrected, and then the template is erected to cast concrete on the connection section between the precast beam 2 and the column 1, and the connection section between the solid web cantilever beam 306 and the column 1, so as to form the beam-column cast-in-place section B5 and the beam-column cast-in-place section A307 accordingly;

[0098] Step 3: Construction of cast-in-place section 31 of cantilever beam at lower cantilever beam B301: erect formwork to cast concrete in the connection section between lower cantilever beam B301 and lower cantilever beam A210, and in the connection section between two adjacent lower cantilever beams B301, correspondingly forming beam body cast-in-place section B6 and cantilever beam cast-in-place section 31;

[0099] Step 4: Construction of prefabricated unit panels 4: hoist the prefabricated unit panels 4 prefabricated in the factory into the grid of the cross hollow grid beams 3 and into the grid formed by the cross hollow grid beams 3, the columns 1 and the prefabricated beams 2;

[0100] Step 5: Cast-in-place floor slab construction: erect formwork and simultaneously cast the connection section between the upper suspension beam B302 and the upper suspension beam A211, the connection section between two adjacent upper suspension beams B302, the connection section between two adjacent prefabricated unit panels 4, and the cast-in-place floor slab;

[0101] Step 6. Repeat steps 1 to 5 to complete the construction of the second floor and above.

[0102] Most of the existing large-span cross hollow beam structures are constructed using cast-in-place concrete. Generally, a one-time formwork support system is used and concrete is poured in batches. However, due to the inconvenience of construction, the construction speed is reduced to a certain extent. In addition, it is very easy to have unstable component connections, resulting in the structure not meeting the use requirements, thereby increasing construction costs.

[0103] During the construction of the floor structure of the assembled cross hollow beam building, there is no need to set up a construction platform for workers, which saves the time of setting up and disassembling the construction platform and ensures the safety of workers. The assembled cross hollow beam building components can be fully assembled. The fully assembled construction significantly reduces the template raw materials, formwork workload and cast-in-place wet operations of columns, beams and slabs at the construction site, while increasing the reuse rate of the factory's complete set of templates, effectively improving construction efficiency and reducing overall construction costs. The factory standardizes the prefabrication and processing of prefabricated columns 11, prefabricated beams 2, cross hollow beam prefabricated units 30 and prefabricated unit plates 4, ensuring the construction quality of key nodes such as beam-column and beam-beam connection points, solving the problems of inconvenient construction of lower suspension beams, long construction period, and opening holes for decoration pipelines, and realizing truly fully assembled green construction. This construction method has been applied in the 1:1 experimental building model test project of the Space Structure Research Center of Guizhou University, greatly saving the construction period.

[0104] The lengths of the beam-column cast-in-place section A307, the beam-column cast-in-place section B5, the beam body cast-in-place section B6 and the cantilever beam cast-in-place section 31 are consistent, and the length of the precast beam 2 is consistent with the length of the cross hollow beam precast unit 30, and the length of the cross hollow beam precast unit 30 is twice its own width. The length of the precast beam 2 is consistent with the length of the cross hollow beam precast unit 30, and the length of the cross hollow beam precast unit 30 is twice its own width, which is conducive to the standardized production of precast components such as the cross hollow beam precast unit 30 and the precast beam 2 in the factory; at the same time, the lengths of the beam-column cast-in-place section A307, the beam-column cast-in-place section B5, the beam body cast-in-place section B6 and the cantilever beam cast-in-place section 31 are consistent, which is convenient for positioning and constructing the cross hollow beam precast unit 30 and the precast beam 2 at the same time.

[0105] The cast-in-place concrete used in the beam-column cast-in-place section A307, beam-column cast-in-place section B5, beam body cast-in-place section B6 and cantilever beam cast-in-place section 31 is a micro-expansion concrete that is one grade higher than the prefabricated components. The fully assembled construction of the assembled cross hollow beam building floor structure effectively solves the problems of inconvenience in the construction platform erection and the cast-in-place construction of the lower cantilever beam, and the long construction period. By using micro-expansion concrete that is one grade higher than the prefabricated components at the assembly nodes, it can not only ensure the mechanical properties of the connection, but also save material costs.

[0106] Specifically, the template is a steel template, and the support frame is a steel pipe bracket constructed by using steel pipes.

Claims

1. An assembled cross hollow beam building floor structure, characterized in that: The invention comprises a plurality of columns (1) and cross hollow grid beams (3), wherein two adjacent columns (1) among the plurality of columns (1) are connected by precast beams (2), and all the columns (1) and all the precast beams (2) together form a rectangular frame, wherein the cross hollow grid beams (3) are located in the rectangular frame and are connected to the columns (1) and the precast beams (2), and precast unit panels (4) are provided in the grids of the cross hollow grid beams (3) and in the grids formed by the cross hollow grid beams (3), the columns (1) and the precast beams (2), and cast-in-place floor slabs are provided on the columns (1), the precast beams (2), the cross hollow grid beams (3) and the precast unit panels (4).

2. The assembled cross hollow beam building floor structure according to claim 1, characterized in that: The column (1) comprises a cast-in-place base (10) and a prefabricated column (11); the prefabricated column (11) is located on the upper side of the cast-in-place base (10) and is connected to the cast-in-place base (10) via a column cast-in-place section (12).

3. The assembled cross hollow beam building floor structure according to claim 2, characterized in that: The cast-in-place base (10) comprises a column foundation (100) and a cast-in-place middle column section (101); the lower end of the cast-in-place middle column section (101) is connected to the column foundation (100), and the upper end is provided with cast-in-place middle column externally extending longitudinal reinforcement (102); The prefabricated column (11) comprises a prefabricated center column section (110), both ends of the prefabricated center column section (110) are provided with prefabricated center column outwardly extending longitudinal reinforcement (111), and a plurality of prefabricated solid web beams (112) are provided at the same elevation on the prefabricated center column section (110), and a prefabricated solid web beam outwardly extending longitudinal reinforcement (113) is provided on one end of the prefabricated solid web beam (112) away from the prefabricated center column section (110); After the precast center column extending longitudinal reinforcement (111) at one end of the precast center column section (110) is connected to the cast-in-place center column extending longitudinal reinforcement (102) on the cast-in-place center column section (101) via the connector A (13), the connecting section between the precast center column section (110) and the cast-in-place center column section (101) is cast-in-place concrete to form a column cast-in-place section (12); The column cast-in-place section (12) is located at the inflection point of the column (1).

4. The assembled cross hollow beam building floor structure according to claim 3, characterized in that: Two, three or four prefabricated solid beams (112) are arranged at the same elevation on the prefabricated center column section (110), and the prefabricated solid beams (112) are located below the upper end surface of the prefabricated center column section (110); A beam-slab connecting rib A (114) is pre-buried at the top of the prefabricated solid web beam (112), the exposed portion of the beam-slab connecting rib A (114) is in an inverted V shape, and the exposed height of the beam-slab connecting rib A (114) differs from the thickness of the cast-in-place floor slab by a thickness of the concrete protective layer; The free ends of the cast-in-situ center column externally extending longitudinal reinforcement (102), the prefabricated center column externally extending longitudinal reinforcement (111) and the prefabricated solid web beam externally extending longitudinal reinforcement (113) are all provided with external threads; The connecting member A (13) is a sleeve.

5. The assembled cross hollow beam building floor structure according to claim 1, characterized in that: Both ends of the precast beam (2) are connected to the column (1) via a beam-column cast-in-place section B (5), and the middle portion of the precast beam (2) is connected to the cross hollow grid beam (3) via a beam-exposed cast-in-place section B (6).

6. The assembled cross hollow beam building floor structure according to claim 1, characterized in that: The prefabricated beam (2) comprises a solid beam body (20), and both ends of the solid beam body (20) are provided with solid beam externally extending longitudinal reinforcements (200), and one or two groups of suspension beam components (21) are provided at the same elevation on the solid beam body (20), and when two groups of suspension beam components (21) are provided on the solid beam body (20), the two groups of suspension beam components (21) are symmetrically arranged on both sides of the solid beam body (20).

7. The assembled cross hollow beam building floor structure according to claim 6, characterized in that: The suspension beam assembly (21) comprises two lower suspension beams A (210) and two upper suspension beams A (211), the two lower suspension beams A (210) are arranged side by side and at the same elevation, one end of each of the two lower suspension beams A (210) is connected to the same side of a solid beam body (20), and the free ends of the two lower suspension beams A (210) are provided with lower suspension beam outwardly extending longitudinal reinforcement A (212), the two upper suspension beams A (211) are arranged side by side and at the same elevation, one end of each of the two upper suspension beams A (211) is connected to the solid beam body (20), the two upper suspension beams A (211) are arranged one by one directly above the two lower suspension beams A (210), the top surfaces of the upper suspension beams A (211) are coplanar with the top surfaces of the solid beam body (20), and the free ends of the two upper suspension beams A (211) are provided with upper suspension beam outwardly extending longitudinal reinforcement A (213).

8. The assembled cross hollow beam building floor structure according to claim 7, characterized in that: The top surface of the solid beam body (20) and the top surface of the upper suspension beam A (211) are both pre-buried with beam-slab connecting ribs B (22), the exposed portion of the beam-slab connecting ribs B (22) is in an inverted V shape, and the exposed height of the beam-slab connecting ribs B (22) differs from the thickness of the cast-in-place floor slab by a thickness of the concrete protective layer; The free ends of the solid beam outwardly extending longitudinal reinforcement (200), the upper cantilever beam outwardly extending longitudinal reinforcement A (213) and the lower cantilever beam outwardly extending longitudinal reinforcement A (212) are all provided with external threads.

9. The assembled cross hollow beam building floor structure according to claim 1, characterized in that: The cross hollow grid beam (3) comprises a plurality of cross hollow beam prefabricated units (30), and two adjacent cross hollow beam prefabricated units (30) among the plurality of cross hollow beam prefabricated units (30) are connected via a cantilever beam cast-in-place section (31).

10. The assembled cross hollow beam building floor structure according to claim 9, characterized in that: The cross hollow beam prefabrication unit (30) comprises two cross-shaped short columns (300), the four free ends of the two cross-shaped short columns (300) are provided with lower suspension beams B (301) and upper suspension beams B (302) side by side, and the upper suspension beams B (302) are located directly above the lower suspension beams B (301), the two cross-shaped short columns (300) are symmetrically arranged, and the lower suspension beams B (301) and the upper suspension beams B (302) at one end of one of the cross-shaped short columns (300) are directly connected one-to-one with the lower suspension beams B (301) and the upper suspension beams B (302) at one end of the other cross-shaped short column (300) during the prefabrication process; The free end of the lower suspension beam B (301) is provided with a lower suspension beam extending longitudinal reinforcement B (303), the free end of the upper suspension beam B (302) is provided with an upper suspension beam extending longitudinal reinforcement B (304), and the free ends of the lower suspension beam extending longitudinal reinforcement B (303) and the upper suspension beam extending longitudinal reinforcement B (304) are both provided with external threads.

11. The assembled cross hollow beam building floor structure according to claim 10, characterized in that: The top surface of the upper suspension beam B (302) and the upper end surface of the cross-shaped short column (300) are coplanar, the bottom surface of the lower suspension beam B (301) and the lower end surface of the cross-shaped short column (300) are coplanar, and the top surface of the upper suspension beam B (302) is pre-embedded with beam-slab connecting ribs C (305), the exposed portion of the beam-slab connecting ribs C (305) is in an inverted V shape, and the exposed height of the beam-slab connecting ribs C (305) differs from the thickness of the cast-in-place floor slab by a thickness of a concrete protective layer.

12. The assembled cross hollow beam building floor structure according to claim 10, characterized in that: Concrete is filled between the lower suspension beam B (301) and the upper suspension beam B (302) at one longitudinal end of the cross hollow beam prefabricated unit (30) to form a solid cantilever beam (306), and the solid cantilever beam (306) is connected to the column (1) via a beam-column cast-in-place section A (307).

13. The assembled cross hollow beam building floor structure according to claim 1, characterized in that: Floor slab connecting ribs (40) are reserved on the four sides and the top surface of the prefabricated unit slab (4).

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