Non-superimposed precast beam slab floor structure

Abstract

The utility model belongs to the technical field of assembly type building structural members and connection, and relates to a non-overlapping precast beam-slab floor system structure which comprises a precast main beam, a precast secondary beam, a precast floor slab, a precast beam and slab connection node structure, a precast slab-slab connection node structure, a precast main and secondary beam connection node structure and corresponding construction installation. The design meets the principle of equivalent cast-in-place, feasible operability is provided for lap joint and effective force transmission of longitudinal stressed steel bars on the upper portion of the prefabricated floor slab through the single-side semicircular grooves, meanwhile, the supporting-free spanning capacity of the prefabricated floor slab is guaranteed, the prefabricated floor slab can be directly placed on the top face of a prefabricated beam, and extra temporary supporting measures under the slab are not needed. The prefabricated beam slab floor system is ingenious in conception, safe and reliable, a brand-new and practical prefabricated beam slab floor system structure is provided for an assembly type building structure, and the technical progress and sustainable development of the building industry are promoted.

Description

Technical Field

[0001] The utility model belongs to the technical field of assembled building structures and relates to a non-composite prefabricated beam and slab floor structure. Background Art

[0002] With the rapid development of the construction industry, prefabricated buildings have gradually become a key trend in engineering construction. Compared to traditional cast-in-place concrete structures, prefabricated buildings significantly improve construction efficiency and quality consistency by prefabricating beams, slabs, columns, and other components in the factory for on-site installation and assembly. This reduces labor costs and construction time, and has been widely used in the construction industry both domestically and internationally.

[0003] Existing precast beam-slab floor structures generally use superimposed joints to connect the main beams and secondary beams, and usually require temporary support frames to ensure the stability and accuracy of the components during the splicing process. However, traditional precast beam-slab floor structures have some technical bottlenecks:

[0004] 1. The need for a temporary support system: In traditional composite beam and composite floor structures, temporary support frames are usually required due to the self-weight of the components and the insufficient local bearing capacity of the composite parts. This type of support frame not only increases construction costs and time, but also occupies a large amount of construction site. Especially in high-rise or super-high-rise buildings, the difficulty of setting up and dismantling the support frame is relatively large, which limits the application scope of prefabricated components.

[0005] 2. Load-bearing performance and node design: Traditional composite floor slabs often use steel trusses as the supporting framework. This requires a large amount of steel, and the support method of the truss steel bars has high load-bearing requirements, which to a certain extent increases the thickness and cost of the floor slab. In addition, the strength and rigidity of steel truss floors at the splicing nodes are limited, and they cannot fully meet the load-bearing requirements in harsh environments such as severe cold and strong winds. These shortcomings in the node structure lead to poor load-bearing reliability at the splicing points, which may cause local cracking or uneven load, affecting the structural safety of the entire floor.

[0006] 3. Complex connection procedures: Traditional precast beam-slab structures feature complex joint designs for primary beams, secondary beams, and floor slabs, often involving multiple overlapping methods and reinforcement lap procedures. This not only complicates on-site construction but also increases the technical requirements of construction personnel. The joints between beams and slabs, and between slabs and slabs, are particularly prone to errors during actual construction, resulting in insufficient structural integrity. Furthermore, the cumbersome arrangement and splicing of the reinforcement trusses limits construction speed, making it difficult to meet the requirements of rapid construction.

[0007] 4. Construction Environmental Constraints: Traditional cast-in-place concrete construction methods are significantly affected by external environmental factors such as weather. This is particularly true during winter, when temperatures drop or rain or snow fall. Concrete curing, molding, and strength are all limited, which, to a certain extent, impacts construction progress and quality. Prefabricated floor slabs, while prefabricated in a factory setting, still require extensive on-site wet work after assembly, particularly the placement of support frames and formwork casting required in traditional structures. This further increases weather and construction environmental constraints.

[0008] In summary, the existing prefabricated beam-slab floor structure has many shortcomings in construction efficiency, mechanical performance, node structure and environmental adaptability. Utility Model Content

[0009] In view of this, the purpose of the present invention is to solve the above problems and provide a non-composite prefabricated beam-slab floor structure.

[0010] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions:

[0011] A non-composite prefabricated beam-slab floor structure, comprising prefabricated main beams, prefabricated secondary beams, and prefabricated floor slabs, wherein the prefabricated main beams, prefabricated secondary beams, and prefabricated floor slabs are connected to each other via prefabricated beam-slab connection node structures, prefabricated slab-slab connection node structures, and prefabricated main and secondary beam connection node structures;

[0012] The prefabricated main beam is prefabricated in full section, and a plurality of U-shaped shear-resistant connecting bars are arranged on the top surface of the prefabricated main beam. The upper connecting steel plate, the lower steel plate support and the double angle steel support bracket are arranged at the mid-span of the prefabricated main beam and the connection area with the prefabricated secondary beam, and the two ends of the prefabricated main beam are reliably connected to the main structure column;

[0013] The prefabricated secondary beam is prefabricated in full section, with multiple U-shaped shear-resistant connecting bars arranged on the top surface of the prefabricated secondary beam, and upper connecting steel plates of the secondary beam arranged at both ends of the prefabricated secondary beam, to which the upper stress-bearing steel bars of the prefabricated secondary beam are welded; the lower part of the end of the prefabricated secondary beam is retracted to form a tongue-and-groove, and the lower stress-bearing steel bars of the prefabricated secondary beam pass through the concrete;

[0014] The prefabricated floor slab is provided with upper longitudinal stress-bearing steel bars, lower longitudinal stress-bearing steel bars, and transverse distribution steel bars; the upper longitudinal stress-bearing steel bars extend out of both ends of the prefabricated floor slab by a set length, the length of which meets the requirements of the steel bar overlap specification; the lower longitudinal stress-bearing steel bars extend out of both ends of the prefabricated floor slab by a set length, the length of which extends to the center line of the beam support; a plurality of semicircular grooves are provided at one end of the prefabricated floor slab, the length of the semicircular grooves being determined according to the steel bar overlap length, and the other end of the prefabricated floor slab is a fully prefabricated section; a full-length tongue and groove is provided on each side of the prefabricated floor slab;

[0015] When the side of the precast floor slab is connected to the beam support, the transverse distribution steel bars extend from the full-length tongue and groove of the precast floor slab, and the lower transverse distribution steel bars extend to the center line of the beam; the upper transverse distribution steel bars extend to the end of the beam support and are bent and anchored or extended to the full-length tongue and groove of another precast floor slab, forming a steel bar overlap force transmission;

[0016] When the side of a precast slab is connected to the side of an adjacent precast slab, the transverse distribution steel bars do not extend out of the side of the precast slab and form a U-shaped closed steel bar.

[0017] Furthermore, the precast beam-slab connection node structure includes a slab end structure and a slab side structure; the slab end structure is as follows: a semicircular groove section of a precast floor slab is placed on one side of the precast main beam or the precast secondary beam, and another precast floor slab full-section section is placed on the other side; the upper longitudinal stress-bearing steel bars of the precast floor slabs on both sides are extended, and the steel bars are overlapped in the semicircular groove section;

[0018] The slab side structure is to place a full-length tongue-and-groove section of a prefabricated floor slab on one side of the prefabricated main beam or the prefabricated secondary beam, and place a full-length tongue-and-groove section of another prefabricated floor slab on the other side, and the upper transverse distributed steel bars of the prefabricated floor slab are all extended, and a steel bar overlap is formed in the top area of ​​the prefabricated main beam or the prefabricated secondary beam to transmit force;

[0019] Concrete is poured in the node area, and the elevation of the finished surface is the same as the elevation of the top surface of the precast floor slab.

[0020] Furthermore, the prefabricated panel connection node is constructed by connecting two adjacent prefabricated floor slabs through a full-length tongue and groove on the side, placing a closed steel bar ring in the full-length tongue and groove, and inserting a structural full-length steel bar inside the steel bar ring on each side of the full-length tongue and groove, and a prefabricated floor slab longitudinal stress-bearing steel bar is tied to the upper part of the transverse distribution steel bars of the prefabricated floor slab; concrete is poured in the node area, and the elevation of the finished pouring surface is the same as the elevation of the top surface of the prefabricated floor slab.

[0021] Furthermore, the connection node of the precast primary and secondary beams is constructed as follows: in the area where the precast primary beam is connected to the precast secondary beam at the mid-span, an opening penetrating the cross section is reserved at the position of the stress-bearing steel bars at the bottom of the precast secondary beam; after the precast secondary beam is placed on the double-angle steel support bracket, the stress-bearing steel bars at the bottom of the precast secondary beam are connected to the short steel bars extending into the opening through a mechanical sleeve, and the anchor connection is completed after the concrete is poured in the node area;

[0022] The upper connecting steel plate of the prefabricated secondary beam and the upper connecting steel plate of the prefabricated main beam are reliably welded. A casting hole is also obliquely opened at the top of the prefabricated secondary beam toward the tongue and groove. The casting hole is pre-embedded with a corrugated pipe, and its outlet is set at the lower tongue and groove of the prefabricated secondary beam.

[0023] The beneficial effects of the present invention are:

[0024] 1) The structure is reliable and applicable in a wide range of scenarios. In this utility model, the connections between the prefabricated components of the floor structure are all made by overlapping steel bars and welding steel plates, which ensures the structure is reliable. Except for the primary and secondary beam connection nodes, beam-slab connection nodes, and slab-slab connection nodes, the remaining parts are all prefabricated. Therefore, the amount of wet work on the construction site is extremely small, breaking through the weather restrictions of conventional cast-in-place concrete, and is particularly suitable for house construction in extremely cold regions.

[0025] 2) Reduce construction costs and eliminate resource waste. Currently, the widely used reinforced truss composite floor slabs in China generally use a large amount of steel for the truss reinforcement, which to a certain extent increases the market price of the composite floor slab. This utility model innovatively proposes a fully prefabricated floor slab with a single groove, which does not require any truss reinforcement to ensure the strength and rigidity of the floor slab, and uses 30% less steel than traditional composite floor slabs.

[0026] 3) Reduce temporary supports and improve construction efficiency. Traditional composite beams and composite floor slabs have limited support-free capabilities due to their small thickness. The prefabricated main beams, prefabricated secondary beams, and prefabricated floor slabs used in this utility model are all full-section prefabricated structures, that is, the upper and lower stress-bearing steel bars of the components are prefabricated in the factory, which greatly improves the support-free spanning capacity of the components. There is no need to set up additional formwork support frames at the construction site, which greatly reduces construction costs, improves construction efficiency, and effectively reduces safety hazards at the construction site.

[0027] In summary, the present invention has shown significant beneficial effects in optimizing construction processes, reducing construction costs, expanding application scenarios, improving construction efficiency, and protecting the environment and saving energy.

[0028] Other advantages, objectives, and features of the present invention will be described in detail in the following description and, to some extent, will be apparent to those skilled in the art upon examination and study of the following or may be learned from practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0030] Figure 1 It is an overall schematic diagram of the prefabricated beam-slab floor structure in the present utility model.

[0031] Figure 2 This is a schematic diagram of the connection node between the prefabricated main beam and the prefabricated secondary beam in the present invention.

[0032] Figure 3 This is a schematic diagram of the plate end structure of the utility model.

[0033] Figure 4 This is a schematic diagram of the side structure of the middle plate of the present invention.

[0034] Figure 5 This is a schematic diagram of the prefabricated main beam in the utility model.

[0035] Figure 6 This is a schematic diagram of the prefabricated secondary beam in the present utility model.

[0036] Figure 7 This is a schematic diagram of the side connections between prefabricated floor slabs in the present invention.

[0037] Figure 8 This is a schematic diagram of the prefabricated floor slab of the present invention.

[0038] Figure numerals: 1-column; 2-prefabricated main beam; 3-prefabricated secondary beam; 4-prefabricated floor slab. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0040] Among them, the accompanying drawings are only for illustrative purposes and represent only schematic diagrams rather than actual pictures, and should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings.

[0041] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] See also Figures 1 to 8 , which is a non-composite prefabricated beam-slab floor structure, including prefabricated main beams 2, prefabricated secondary beams 3, and prefabricated floor slabs 4. The prefabricated main beams 2, prefabricated secondary beams 3, and prefabricated floor slabs 4 are connected to each other through prefabricated beam-slab connection node structures, prefabricated slab-slab connection node structures, and prefabricated main and secondary beam connection node structures;

[0043] The precast main beam 2 is prefabricated in full section. Multiple U-shaped shear reinforcement bars are set on the top surface of the precast main beam 2. The upper connecting steel plate, lower steel plate support and double angle steel support brackets are set at the mid-span of the precast main beam 2 and the connection area with the precast secondary beam 3. The two ends of the precast main beam 2 are reliably connected to the main structure column 1.

[0044] The precast secondary beam 3 is prefabricated in its entirety. Multiple U-shaped shear reinforcement bars are installed on the top surface of the precast secondary beam 3. Upper secondary beam connection steel plates are installed at both ends of the precast secondary beam 3. The upper stress-bearing reinforcement bars of the precast secondary beam 3 are welded to the upper secondary beam connection steel plates. The lower end of the precast secondary beam 3 is retracted to form a tongue-and-groove, and the lower stress-bearing reinforcement bars of the precast secondary beam 3 extend out of the concrete.

[0045] The precast floor slab 4 is equipped with upper longitudinal stress-bearing steel bars, lower longitudinal stress-bearing steel bars, and transverse distribution steel bars; the upper longitudinal stress-bearing steel bars extend out of both ends of the precast floor slab 4 by a set length, the length of which meets the requirements of the steel bar overlap specification; the lower longitudinal stress-bearing steel bars extend out of both ends of the precast floor slab 4 by a set length, the length of which extends to the center line of the beam support; one end of the precast floor slab 4 is provided with multiple semicircular grooves, the length of which is determined by the steel bar overlap length, and the other end of the precast floor slab 4 is a fully precast section; a full-length tongue-and-groove is provided on each side of the precast floor slab 4;

[0046] When the side of the precast floor slab 4 is connected to the beam support, the transverse distribution steel bars extend from the full-length tongue and groove of the precast floor slab 4, and the lower transverse distribution steel bars extend to the center line of the beam; the upper transverse distribution steel bars extend to the end of the beam support and are bent and anchored or extended to the full-length tongue and groove of another precast floor slab 4, forming a steel bar overlap force transmission;

[0047] When the side of the prefabricated floor slab 4 is connected to the side of the adjacent prefabricated floor slab 4, the transverse distributed steel bars do not extend out of the side of the prefabricated floor slab 4 and form a U-shaped closed steel bar.

[0048] The precast beam-slab connection node structure includes a slab end structure and a slab side structure. The slab end structure is as follows: a semicircular groove section of a precast floor slab 4 is placed on one side of the precast main beam 2 or precast secondary beam 3, and another precast floor slab 4 with a fully precast cross-section is placed on the other side. The upper longitudinal stress-bearing steel bars of the precast floor slabs 4 on both sides are extended and the steel bars are overlapped in the semicircular groove section.

[0049] The slab side structure is as follows: a full-length tongue-and-groove section of a precast floor slab 4 is placed on one side of the precast main beam 2 or precast secondary beam 3, and a full-length tongue-and-groove section of another precast floor slab 4 is placed on the other side. The upper transverse distributed steel bars of the precast floor slab 4 are all extended, and a steel bar overlap is formed at the top area of ​​the precast main beam 2 or precast secondary beam 3 to transmit force;

[0050] Concrete is poured in the node area, and the elevation of the finished pouring surface is the same as the elevation of the top surface of precast floor slab 4.

[0051] The precast panel connection node is constructed by connecting two adjacent precast floor slabs 4 through a full-length tongue and groove on the side. A closed steel bar ring is placed in the full-length tongue and groove. The steel bar ring is arranged along the full length of the tongue and groove, and a structural full-length steel bar is inserted into the steel bar ring on each side of the full-length tongue and groove. A precast floor slab 4 longitudinal stress-bearing steel bar is tied to the upper part of the transverse distribution steel bars of the precast floor slab 4; concrete is poured in the node area, and the elevation of the finished pouring surface is the same as the elevation of the top surface of the precast floor slab 4.

[0052] The precast primary and secondary beam connection node is constructed as follows: In the area where the precast primary beam 2 meets the precast secondary beam 3 at the mid-span, a hole is reserved for the precast primary beam 2 at the position of the stress-bearing reinforcement at the bottom of the precast secondary beam 3. After the precast secondary beam 3 is placed on the double-angle steel support bracket, the stress-bearing reinforcement at the bottom of the precast secondary beam 3 is connected to the short reinforcement extending into the hole through a mechanical sleeve. The anchor connection is completed after the concrete is poured in the node area.

[0053] The upper connecting steel plate of the prefabricated secondary beam 3 and the upper connecting steel plate of the prefabricated main beam 2 are reliably welded. A casting hole is also obliquely opened at the top of the prefabricated secondary beam 3 toward the tongue and groove direction. The casting hole is pre-embedded with a corrugated pipe, and its outlet is set at the lower tongue and groove of the prefabricated secondary beam 3.

[0054] The support-free construction method of the non-composite prefabricated beam-slab floor structure in this embodiment includes the following steps:

[0055] a) Prefabricated concrete full-section main beams 2 and secondary beams 3 are manufactured in a factory. A tongue-and-groove is reserved at the lower portion of the first stirrup at one end of the secondary beam 3, and the lower stress-bearing reinforcement of the secondary beam 3 is extended. An upper connecting steel plate is embedded at the end of the secondary beam 3, and the upper stress-bearing reinforcement of the secondary beam 3 is welded to the upper connecting steel plate of the secondary beam. A lower steel plate support and an upper connecting steel plate are embedded within the prefabricated main beam 2, and double angle steel is welded to the lower steel plate support as a supporting corbel. An opening is reserved in the prefabricated main beam 2 that passes through the cross section.

[0056] b) After installing the frame columns 1 of the main structure, hoist the prefabricated main beam 2 to the designated location and place the prefabricated secondary beam 3 on the double-angle steel support brackets on the prefabricated main beam 2;

[0057] c) Install a mechanical sleeve at the front end of the stressed steel bar at the bottom of the precast secondary beam 3, then install a short steel bar at the front end of the mechanical sleeve to complete the mechanical connection, and extend the short steel bar into the opening in the precast main beam 2;

[0058] d) Reliably weld the upper connecting steel plates of the precast main beam 2 and the precast secondary beam 3, and then install the concrete pouring mold in the node area of ​​the main and secondary beams;

[0059] e) Hoist the precast floor slabs 4 sequentially from one side of the floor structure, with the placement direction of the semicircular groove sections consistent with the hoisting forward direction, that is, the protruding steel bars of the fully precast cross-section section of the subsequent precast floor slab 4 should be placed in the semicircular groove section of the previous precast floor slab 4; then fine-tune and tie the floor slab steel bars;

[0060] f) At the side joints of the precast floor slab 4, insert the closed steel ring and the structural full-length steel bar in the full-length tongue and groove in sequence. Finally, tie one longitudinal stress-bearing steel bar of the precast floor slab 4 to the upper part of the transverse distribution steel bars of the precast floor slab 4;

[0061] g) Pour the post-cast concrete in all the joint areas of the floor structure to complete the pouring of the floor structure of this layer.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A non-composite precast beam-slab floor structure, comprising precast main beams, precast secondary beams, and precast floor slabs, wherein the precast main beams, precast secondary beams, and precast floor slabs are connected to each other via precast beam-slab connection node structures, precast slab-slab connection node structures, and precast main and secondary beam connection node structures, characterized in that: The prefabricated main beam is prefabricated in full section, and a plurality of U-shaped shear-resistant connecting bars are arranged on the top surface of the prefabricated main beam. The upper connecting steel plate, the lower steel plate support and the double angle steel support bracket are arranged at the mid-span of the prefabricated main beam and the connection area with the prefabricated secondary beam, and the two ends of the prefabricated main beam are reliably connected to the main structure column; The prefabricated secondary beam is prefabricated in full section, with multiple U-shaped shear-resistant connecting bars arranged on the top surface of the prefabricated secondary beam, and upper connecting steel plates of the secondary beam arranged at both ends of the prefabricated secondary beam, to which the upper stress-bearing steel bars of the prefabricated secondary beam are welded; the lower part of the end of the prefabricated secondary beam is retracted to form a tongue-and-groove, and the lower stress-bearing steel bars of the prefabricated secondary beam pass through the concrete; The prefabricated floor slab is provided with upper longitudinal stress-bearing steel bars, lower longitudinal stress-bearing steel bars, and transverse distribution steel bars; the upper longitudinal stress-bearing steel bars extend out of both ends of the prefabricated floor slab by a set length, the length of which meets the requirements of the steel bar overlap specification; the lower longitudinal stress-bearing steel bars extend out of both ends of the prefabricated floor slab by a set length, the length of which extends to the center line of the beam support; a plurality of semicircular grooves are provided at one end of the prefabricated floor slab, the length of the semicircular grooves being determined according to the steel bar overlap length, and the other end of the prefabricated floor slab is a fully prefabricated section; a full-length tongue and groove is provided on each side of the prefabricated floor slab; When the side of the precast floor slab is connected to the beam support, the transverse distribution steel bars extend from the full-length tongue and groove of the precast floor slab, and the lower transverse distribution steel bars extend to the center line of the beam; the upper transverse distribution steel bars extend to the end of the beam support and are bent and anchored or extended to the full-length tongue and groove of another precast floor slab, forming a steel bar overlap force transmission; When the side of a precast slab is connected to the side of an adjacent precast slab, the transverse distribution steel bars do not extend out of the side of the precast slab and form a U-shaped closed steel bar.

2. The prefabricated beam-slab floor structure according to claim 1, characterized in that: The precast beam-slab connection node structure includes a slab end structure and a slab side structure; the slab end structure is as follows: a semicircular groove section of a precast floor slab is placed on one side of the precast main beam or the precast secondary beam, and another precast floor slab full-section section is placed on the other side; the upper longitudinal stress-bearing steel bars of the precast floor slabs on both sides are extended, and the steel bars are overlapped in the semicircular groove section; The slab side structure is to place a full-length tongue-and-groove section of a prefabricated floor slab on one side of the prefabricated main beam or the prefabricated secondary beam, and place a full-length tongue-and-groove section of another prefabricated floor slab on the other side, and the upper transverse distributed steel bars of the prefabricated floor slab are all extended, and a steel bar overlap is formed in the top area of ​​the prefabricated main beam or the prefabricated secondary beam to transmit force; Concrete is poured in the node area, and the elevation of the finished surface is the same as the elevation of the top surface of the precast floor slab.

3. The prefabricated beam-slab floor structure according to claim 1, characterized in that: The prefabricated panel connection node is constructed by connecting two adjacent prefabricated floor slabs through a full-length tongue and groove on the side, placing a closed steel bar ring in the full-length tongue and groove, and inserting a structural full-length steel bar into the steel bar ring on each side of the full-length tongue and groove, and tying one prefabricated floor slab longitudinal stress-bearing steel bar to the upper part of the transverse distributed steel bars of the prefabricated floor slab; concrete is poured in the node area, and the elevation of the finished pouring surface is the same as the elevation of the top surface of the prefabricated floor slab.

4. The prefabricated beam-slab floor structure according to claim 1, characterized in that: The prefabricated primary and secondary beam connection node is constructed as follows: in the area where the prefabricated primary beam meets the prefabricated secondary beam at the mid-span, an opening is reserved for the prefabricated primary beam at the position of the stress-bearing steel bars at the bottom of the prefabricated secondary beam; after the prefabricated secondary beam is placed on the double-angle steel support bracket, the stress-bearing steel bars at the bottom of the prefabricated secondary beam are connected to the short steel bars extending into the opening through a mechanical sleeve, and the anchor connection is completed after the concrete in the node area is poured; The upper connecting steel plate of the prefabricated secondary beam and the upper connecting steel plate of the prefabricated main beam are reliably welded. A casting hole is also obliquely opened at the top of the prefabricated secondary beam toward the tongue and groove. The casting hole is pre-embedded with a corrugated pipe, and its outlet is set at the lower tongue and groove of the prefabricated secondary beam.

Images