Non-superimposed precast beam slab floor structure and support-free construction method

Abstract

The invention belongs to the technical field of fabricated building structural members and connection, and relates to a non-superimposed precast beam slab floor system structure and a support-free construction method. Comprising a prefabricated main beam, a prefabricated secondary beam, a prefabricated floor slab, a prefabricated beam and plate connection node structure, a prefabricated plate and plate connection node structure, a prefabricated main and secondary beam connection node structure and a corresponding construction and installation method. 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 structure and the support-free construction method are ingenious in conception, safe and reliable, a brand new and practical prefabricated beam slab floor structure and a support-free construction method are 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 present invention belongs to the technical field of assembled building structures, and relates to a non-composite prefabricated beam-slab floor structure and a support-free construction method. Background Art

[0002] With the rapid development of the construction industry, prefabricated buildings have gradually become an important direction in engineering construction. Compared with traditional cast-in-place concrete structures, prefabricated buildings prefabricate beams, slabs, columns and other components in factories and install and assemble them on site, which greatly improves construction efficiency and quality stability, reduces labor costs and construction time, and has been widely used in the construction field at home and abroad.

[0003] The existing prefabricated beam-slab floor structure generally uses the method of connecting the main beam and the secondary beam through the superimposed node, and usually requires the installation of temporary support frames to ensure the stability and accuracy of the components during the splicing process. However, the traditional prefabricated beam-slab floor structure has some technical bottlenecks:

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

[0005] 2. Stress performance and node design: In traditional composite floors, steel trusses are often used as supporting frames. The amount of steel bars used is large, and the support method of the truss steel bars has high stress requirements, which increases the thickness and cost of the floor to a certain extent. In addition, the strength and rigidity of the steel truss floor at the splicing nodes are limited, and cannot fully meet the load-bearing requirements in harsh environments such as severe cold and strong winds. The shortcomings in the node structure lead to poor stress reliability at the splicing point, which may cause local cracking or uneven stress, affecting the structural safety of the overall floor.

[0006] 3. Complex connection process: The traditional prefabricated beam-slab structure has complex design of the main beam, secondary beam, and floor slab joints, which usually involve multiple overlapping methods and steel bar lap joints. This not only increases the complexity of on-site construction, but also increases the technical requirements of construction personnel. In particular, the node splicing of beam-slab and slab-slab is prone to errors in actual construction, resulting in insufficient structural integrity. In addition, due to the cumbersome arrangement and splicing process of the steel bar truss, the construction speed is limited, making it difficult to meet the requirements of fast construction.

[0007] 4. Construction environment restrictions: The traditional cast-in-place concrete construction mode is greatly affected by external environmental factors such as weather, especially in winter when the temperature is low or in rainy and snowy weather. The curing, molding effect and strength of the concrete are all restricted, which to some extent affects the construction progress and quality. Although prefabricated assembled floor slabs are prefabricated in a factory environment, a lot of on-site wet work is still required after assembly, especially the arrangement of support frames and formwork casting required in traditional structures, which further increases the restrictions of weather and construction environment.

[0008] In summary, the existing prefabricated beam-slab floor structure has many shortcomings in terms of construction efficiency, stress performance, node structure and environmental adaptability. Summary of the invention

[0009] In view of this, the object of the present invention is to solve the above-mentioned problem and provide a non-composite prefabricated beam-slab floor structure and a support-free construction method.

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

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

[0012] The prefabricated main beam is prefabricated in full section, and a plurality of U-shaped shear-resistant connecting dowel 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 supporting bracket of the prefabricated main beam are arranged in the mid-span area where the prefabricated main beam is connected with the prefabricated secondary beam, and the two ends of the prefabricated main beam are reliably connected with the main structure column;

[0013] The prefabricated secondary beam is prefabricated in full section, a plurality of U-shaped shear-resistant connecting dowel bars are arranged on the top surface of the prefabricated secondary beam, and upper connecting steel plates of the secondary beam are arranged at both ends of the prefabricated secondary beam. The upper stress-bearing steel bars of the prefabricated secondary beam are welded to the upper connecting steel plates of the secondary beam; 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 built 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 the two ends of the prefabricated floor slab by a set length, and the length meets the requirements of the steel bar overlap specification; the lower longitudinal stress-bearing steel bars extend out of the two ends of the prefabricated floor slab by a set length, and the length extends to the center line of the beam support; a plurality of semicircular grooves are arranged at one end of the prefabricated floor slab, and the length of the semicircular grooves is 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 arranged 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 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 bend and anchor or extend to the full-length tongue 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 prefabricated beam-slab connection node structure includes a slab end structure and a slab side structure; the slab end structure is that a semicircular groove section of a prefabricated floor slab is placed on one side of the prefabricated main beam or the prefabricated secondary beam, and another prefabricated floor slab full prefabricated section section is placed on the other side, the upper longitudinal force-bearing steel bars of the prefabricated floor slabs on both sides are extended, and the steel bars are overlapped in the semicircular groove section;

[0018] The plate 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 transversely 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, the steel bar ring is arranged along the full length of the tongue and groove, and a structural full-length steel bar is inserted inside the steel bar ring on each side of the full-length tongue and groove, and a prefabricated floor slab longitudinal force-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] Further, the connection node of the prefabricated main and secondary beams is constructed as follows: in the area where the prefabricated main beam is connected to the prefabricated secondary beam in the middle of the span, a hole penetrating the cross section is reserved at the position of the stress-bearing steel bar at the bottom of the prefabricated secondary beam; after the prefabricated secondary beam is placed and installed on the double-angle steel support bracket, the stress-bearing steel bar at the bottom of the prefabricated secondary beam is connected to the short steel bar extending into the hole 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, and a casting hole is obliquely opened at the top of the prefabricated secondary beam toward the tongue and groove direction. The casting hole is pre-buried with a corrugated pipe, and its outlet is set at the lower tongue and groove of the prefabricated secondary beam.

[0023] A support-free construction method for a non-composite prefabricated beam-slab floor structure, applicable to the above-mentioned non-composite prefabricated beam-slab floor structure, comprises the following steps:

[0024] a) Prefabricated main beams and secondary beams with full concrete sections are manufactured in the factory, wherein a tongue-and-groove is reserved at the lower part of the first stirrup at one end of the prefabricated secondary beam, and the lower stress-bearing steel bars of the prefabricated secondary beam are in an extended state; an upper connecting steel plate is embedded at the end of the prefabricated secondary beam, and the upper stress-bearing steel bars of the prefabricated secondary beam are welded to the upper connecting steel plate of the secondary beam; a lower steel plate support and an upper connecting steel plate are embedded inside the prefabricated main beam, and a double angle steel is welded to the lower steel plate support as a supporting corbel, and a hole penetrating the cross section is reserved in the prefabricated main beam;

[0025] b) After installing the frame columns of the main structure, hoist the prefabricated main beam to the designated location and place the prefabricated secondary beam on the double angle steel support brackets on the prefabricated main beam;

[0026] c) Install a mechanical sleeve at the front end of the stress-bearing steel bar at the lower part of the prefabricated secondary beam, 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 prefabricated main beam;

[0027] d) Reliably weld the upper connecting steel plates of the prefabricated main beam and the prefabricated secondary beam, and then install the concrete pouring mold in the node area of ​​the main and secondary beams;

[0028] e) The prefabricated floor slabs are hoisted from one side of the floor structure in sequence. The placement direction of the semicircular groove section is consistent with the hoisting forward direction, that is, the steel bars of the fully prefabricated section section of the rear prefabricated floor slab should be placed in the semicircular groove section of the front prefabricated floor slab; then the floor slab steel bars are fine-tuned and tied;

[0029] f) At the side joint of the precast floor slab, place the closed steel bar ring and the structural full-length steel bar in the full-length tongue and groove in sequence, and finally tie one precast floor slab longitudinal force-bearing steel bar on the upper part of the transverse distribution steel bars of the precast floor slab;

[0030] g) Pour the post-pour concrete in all the node areas of the floor structure to complete the pouring of the floor of this layer.

[0031] The beneficial effects of the present invention are:

[0032] 1) The structure is reliable in force and applicable to a wide range of scenarios. In the present invention, the connections of the prefabricated components of the floor structure are connected by means of steel bar lap joints, steel plate welding, etc., and the structure is reliable in force. Except for the primary and secondary beam connection nodes, beam-slab connection nodes, and plate-slab connection nodes, the rest are prefabricated, so the amount of wet work on the construction site is very small, breaking through the weather restrictions of conventional concrete casting, and is particularly suitable for house construction in cold areas.

[0033] 2) Save construction costs and eliminate waste of resources. In the steel truss composite floor slabs currently widely used in China, the amount of steel used for the truss steel bars is generally large, which increases the market price of the composite floor slabs to a certain extent. The present invention creatively proposes a single-side grooved fully prefabricated floor slab, which can ensure the strength and rigidity of the floor slab without using any truss steel bars, and saves 30% of steel compared to traditional composite floor slabs.

[0034] 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 the present invention 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.

[0035] 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.

[0036] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 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 in conjunction with the accompanying drawings, wherein:

[0038] Figure 1 It is an overall schematic diagram of the prefabricated beam-slab floor structure in the present invention.

[0039] Figure 2 It is a schematic diagram of the connection node between the prefabricated main beam and the prefabricated secondary beam in the present invention.

[0040] Figure 3 It is a schematic diagram of the plate end structure in the present invention.

[0041] Figure 4 It is a schematic diagram of the plate side structure of the present invention.

[0042] Figure 5 This is a schematic diagram of the prefabricated main beam in the present invention.

[0043] Figure 6 It is a schematic diagram of the prefabricated secondary beam in the present invention.

[0044] Figure 7It is a schematic diagram of the side connection between the prefabricated floor slabs in the present invention.

[0045] Figure 8 It is a schematic diagram of the prefabricated floor slab of the present invention.

[0046] Figure numerals: 1-column; 2-prefabricated main beam; 3-prefabricated secondary beam; 4-prefabricated floor slab. DETAILED DESCRIPTION

[0047] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0048] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0049] 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 the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position 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.

[0050] See also Figures 1 to 8 , which is a non-composite prefabricated beam-slab floor structure, comprising a prefabricated main beam 2, a prefabricated secondary beam 3, and a prefabricated floor slab 4, wherein the prefabricated main beam 2, the prefabricated secondary beam 3, and the prefabricated floor slab 4 are connected to each other via a prefabricated beam-slab connection node structure, a prefabricated slab-slab connection node structure, and a prefabricated main and secondary beam connection node structure;

[0051] The prefabricated main beam 2 is prefabricated in full section, and a plurality of U-shaped shear-resistant connecting dowel bars are arranged on the top surface of the prefabricated main beam 2. The upper connecting steel plate, the lower steel plate support and the double angle steel supporting bracket of the prefabricated main beam 2 are arranged in the mid-span area where the prefabricated main beam 2 and the prefabricated secondary beam 3 are connected, and the two ends of the prefabricated main beam 2 are reliably connected to the main structure column 1;

[0052] The prefabricated secondary beam 3 is prefabricated in full section, and a plurality of U-shaped shear-resistant connecting dowel bars are arranged on the top surface of the prefabricated secondary beam 3. The upper connecting steel plates of the secondary beam are arranged at both ends of the prefabricated secondary beam 3, and the upper stress-bearing steel bars of the prefabricated secondary beam 3 are welded to the upper connecting steel plates of the secondary beam; the lower part of the end of the prefabricated secondary beam 3 is retracted to form a tongue and groove, and the lower stress-bearing steel bars of the prefabricated secondary beam 3 pass through the concrete;

[0053] The precast floor 4 is built 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 the two ends of the precast floor 4 by a set length, and the length meets the requirements of the steel bar overlap specification; the lower longitudinal stress-bearing steel bars extend out of the two ends of the precast floor 4 by a set length, and the length extends to the center line of the beam support; a plurality of semicircular grooves are provided at one end of the precast floor 4, and the length of the semicircular grooves is determined according to the steel bar overlap length, and the other end of the precast floor 4 is a fully precast section; a full-length tongue and groove is provided on each side of the precast floor 4;

[0054] When the side of the precast floor 4 is connected to the beam support, the transverse distribution steel bars extend from the full-length tongue of the precast floor 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 bend and anchor or extend to the full-length tongue of another precast floor 4, forming a steel bar overlap force transmission;

[0055] When the side of the prefabricated floor slab 4 is connected to the side of the adjacent prefabricated floor slab 4, the transversely distributed steel bars do not extend out of the side of the prefabricated floor slab 4 and form a U-shaped closed steel bar.

[0056] The precast beam-slab connection node structure includes a slab end structure and a slab side structure; the slab end structure is: a semicircular groove section of a precast floor slab 4 is placed on one side of a precast main beam 2 or a precast secondary beam 3, and another precast floor slab 4 full precast cross-section section is placed on the other side, and the upper longitudinal force-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;

[0057] The plate 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 the precast secondary beam 3, and a full-length tongue-and-groove section of another precast floor slab 4 is placed on the other side, and the upper transversely 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 the precast secondary beam 3 to transmit force;

[0058] 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 precast slab 4.

[0059] 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, and 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 force-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.

[0060] The prefabricated main and secondary beam connection node is constructed as follows: in the area where the prefabricated main beam 2 is connected to the prefabricated secondary beam 3 in the middle of the span, a hole is reserved for the prefabricated main beam 2 at the position of the stress-bearing steel bar at the bottom of the prefabricated secondary beam 3. After the prefabricated secondary beam 3 is placed and installed on the double-angle steel support bracket, the stress-bearing steel bar at the bottom of the prefabricated secondary beam 3 is connected to the short steel bar extending into the hole through a mechanical sleeve, and the anchor connection is completed after the concrete is poured in the node area;

[0061] 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, and a casting hole is obliquely opened at the top of the prefabricated secondary beam 3 toward the tongue and groove. The casting hole is pre-buried with a corrugated pipe, and its outlet is set at the lower tongue and groove of the prefabricated secondary beam 3.

[0062] A support-free construction method for a non-composite prefabricated beam-slab floor structure comprises the following steps:

[0063] a) Prefabricated main beams 2 and secondary beams 3 of full concrete cross-section are manufactured in the factory, wherein a tongue-and-groove is reserved at the lower part of the first stirrup at one end of the secondary beam 3, and the lower stress-bearing steel bars of the secondary beam 3 are in an extended state; an upper connecting steel plate is embedded at the end of the secondary beam 3, and the upper stress-bearing steel bars of the secondary beam 3 are welded to the upper connecting steel plate of the secondary beam; a lower steel plate support and an upper connecting steel plate are embedded inside the prefabricated main beam 2, and a double angle steel is welded to the lower steel plate support as a supporting corbel, and a hole penetrating the cross section is reserved in the prefabricated main beam 2;

[0064] b) After installing the frame column 1 of the main structure, hoist the prefabricated main beam 2 to the designated position, and place the prefabricated secondary beam 3 on the double angle steel support bracket on the prefabricated main beam 2;

[0065] c) Install a mechanical sleeve at the front end of the stress-bearing steel bar at the lower part of the prefabricated 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 prefabricated main beam 2;

[0066] d) Reliably weld the upper connecting steel plates of the prefabricated main beam 2 and the prefabricated secondary beam 3, and then install the concrete pouring mold in the node area of ​​the main and secondary beams;

[0067] e) The prefabricated floor slabs 4 are hoisted in sequence from one side of the floor structure, and the placement direction of the semicircular groove section is consistent with the hoisting forward direction, that is, the steel bars of the fully prefabricated cross-section section of the rear prefabricated floor slab 4 should be placed in the semicircular groove section of the front prefabricated floor slab 4; then the floor slab steel bars are fine-tuned and tied;

[0068] f) At the side joint of the precast floor slab 4, a closed steel bar ring and a structural full-length steel bar are sequentially placed in the full-length tongue and groove, and finally, one precast floor slab 4 longitudinal force-bearing steel bar is respectively tied to the upper part of the transverse distribution steel bars of the precast floor slab 4;

[0069] g) Pour the post-pour concrete in all the node areas of the floor structure to complete the pouring of the floor of this layer.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention 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 present invention.

Claims

1. 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 through prefabricated beam-slab connection node structures, prefabricated slab-slab connection node structures, and prefabricated 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 dowel 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 supporting bracket of the prefabricated main beam are arranged in the mid-span area where the prefabricated main beam is connected with the prefabricated secondary beam, and the two ends of the prefabricated main beam are reliably connected with the main structure column; The prefabricated secondary beam is prefabricated in full section, a plurality of U-shaped shear-resistant connecting dowel bars are arranged on the top surface of the prefabricated secondary beam, and upper connecting steel plates of the secondary beam are arranged at both ends of the prefabricated secondary beam. The upper stress-bearing steel bars of the prefabricated secondary beam are welded to the upper connecting steel plates of the secondary beam; 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 built 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 the two ends of the prefabricated floor slab by a set length, and the length meets the requirements of the steel bar overlap specification; the lower longitudinal stress-bearing steel bars extend out of the two ends of the prefabricated floor slab by a set length, and the length extends to the center line of the beam support; a plurality of semicircular grooves are arranged at one end of the prefabricated floor slab, and the length of the semicircular grooves is 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 arranged 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 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 bend and anchor or extend to the full-length tongue 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 prefabricated beam-slab connection node structure includes a slab end structure and a slab side structure; the slab end structure is that a semicircular groove section of a prefabricated floor slab is placed on one side of the prefabricated main beam or the prefabricated secondary beam, and another prefabricated floor slab full prefabricated section section is placed on the other side, the upper longitudinal force-bearing steel bars of the prefabricated floor slabs on both sides are extended, and the steel bars are overlapped in the semicircular groove section; The plate 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 transversely 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 slab connection node is constructed by connecting two adjacent prefabricated slabs through a full-length tongue and groove on the side, placing a closed steel bar ring 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, and a prefabricated slab longitudinal force-bearing steel bar is tied to the upper part of the transverse distribution steel bars of the prefabricated slab; concrete is poured in the node area, and the elevation of the poured surface is the same as the elevation of the top surface of the prefabricated slab.

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

5. A support-free construction method for a non-composite prefabricated beam-slab floor structure, applicable to a non-composite prefabricated beam-slab floor structure as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: a) Prefabricated main beams and secondary beams with full concrete sections are manufactured in the factory, wherein a tongue-and-groove is reserved at the lower part of the first stirrup at one end of the prefabricated secondary beam, and the lower stress-bearing steel bars of the prefabricated secondary beam are in an extended state; an upper connecting steel plate is embedded at the end of the prefabricated secondary beam, and the upper stress-bearing steel bars of the prefabricated secondary beam are welded to the upper connecting steel plate of the secondary beam; a lower steel plate support and an upper connecting steel plate are embedded inside the prefabricated main beam, and a double angle steel is welded to the lower steel plate support as a supporting corbel, and a hole penetrating the cross section is reserved in the prefabricated main beam; b) After installing the frame columns of the main structure, hoist the prefabricated main beam to the designated location and place the prefabricated secondary beam on the double angle steel support brackets on the prefabricated main beam; c) Install a mechanical sleeve at the front end of the stress-bearing steel bar at the lower part of the prefabricated secondary beam, 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 prefabricated main beam; d) Reliably weld the upper connecting steel plates of the prefabricated main beam and the prefabricated secondary beam, and then install the concrete pouring mold in the node area of ​​the main and secondary beams; e) The prefabricated floor slabs are hoisted from one side of the floor structure in sequence. The placement direction of the semicircular groove section is consistent with the hoisting forward direction, that is, the steel bars of the fully prefabricated section section of the rear prefabricated floor slab should be placed in the semicircular groove section of the front prefabricated floor slab; then the floor slab steel bars are fine-tuned and tied; f) At the side joint of the precast floor slab, place the closed steel bar ring and the structural full-length steel bar in the full-length tongue and groove in sequence, and finally tie one precast floor slab longitudinal force-bearing steel bar on the upper part of the transverse distribution steel bars of the precast floor slab; g) Pour the post-pour concrete in all the node areas of the floor structure to complete the pouring of the floor of this layer.

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