A prefabricated assembly structure and construction method for roofs with long overhanging eaves

Abstract

A prefabricated assembly structure and construction method for a long overhanging roof is characterized by the use of overlapping upper inverted beams to connect prefabricated slabs. The long overhanging roof is integrated with the main structure through overlapping and pouring with the frame beams of the main structure. The roof-shaped long overhanging roof components of this invention are prefabricated and cured in the factory, which can effectively control the quality of concrete pouring, shrinkage and deformation, or achieve a one-time molding fair-faced concrete effect. They are then transported to the site for on-site assembly. The appearance of the building and the quality of the finished components will be greatly improved, and the environmental pollution is small and the impact of climate is small, which meets the requirements of green building.

Description

Technical Field

[0001] This invention relates to a prefabricated assembly structure and construction method for roofs with long overhanging eaves, which is particularly suitable for single-layer or multi-layer concrete structures that require a specific shape or fair-faced concrete effect for the long overhanging eaves. Background Technology

[0002] The cantilever length of existing prefabricated cantilever slabs and cantilever balconies is generally no more than 2m. If it exceeds 2m, it is generally considered to be cast in place as a whole, and it cannot meet the prefabrication requirements of complex shapes.

[0003] To address the challenges of controlling construction quality and precision when casting concrete on-site for large cantilevered structures as part of the architectural form, especially when the cantilever length is large, the increasing use of exposed concrete and complex cantilevered structures as part of the building's design can lead to issues such as large-area concrete shrinkage, honeycombing, pitting, and cracking. This invention solves these problems by using factory prefabrication for large cantilevered exposed concrete components or complex structural components. On-site assembly allows for quality control and environmentally friendly practices. Summary of the Invention

[0004] This invention provides a prefabricated assembly structure and construction method for roofs with long overhanging eaves. Its purpose is to solve the technical problems that when the overhanging length is large, it is not easy to control the construction quality and precision of the on-site concrete pouring, which is prone to large-area concrete shrinkage, honeycombing, pitting and cracking. On the other hand, the overall cast-in-place method cannot meet the requirements of prefabricated assembly for complex shapes.

[0005] The technical solution of the present invention is as follows:

[0006] A construction method for a prefabricated assembled structure with a long overhanging eaves is characterized by the use of overlapping upper inverted beams to connect prefabricated slabs to the main structure, and the overhanging eaves being integrated with the main structure through overlapping and pouring with the frame beams of the main structure; the construction steps are as follows:

[0007] (1) The large eaves 100 is divided into multiple small cantilever slabs 1 in the horizontal direction and processed into precast slabs in the factory; the steel reinforcement frame of the longitudinal overlapping upper inverted beam 7 and the steel reinforcement frame of the transverse overlapping upper inverted frame beam 3 are reserved on the upper part of each small cantilever slab 1 to form the steel reinforcement frame of the rectangular upper inverted beam; the structural longitudinal reinforcement 2 of the precast slab has a reserved protruding connecting section 201 on the inner end face of the connection with the main structure;

[0008] The main structure 200 to be connected has a longitudinal main structure superimposed ...

[0009] The aforementioned steel reinforcement frame consists of upper inverted beam stirrups 6 reserved along the beam at the top of the precast slab or main structural slab, and upper inverted beam bottom longitudinal reinforcement 5 reserved along the beam at the bottom of the precast slab or main structural slab.

[0010] (2) Transport the prefabricated small cantilever slab 1 from step (1) to the site, and hoist the prefabricated small cantilever slab 1 piece by piece to splice the large eaves 100 on site. The inner bottom of the small cantilever slab 1 is simply supported by the corbel of the main cast-in-place frame beam 4 at the bottom of the main structure to be connected, and temporary support or cable tie is provided on its outer side. The bottom main structure frame beam 300 extends to the bottom of the eaves for connection support.

[0011] (3) After the splicing of the large eaves in step (2) is completed, tie the stirrups 6 of the upper inverted beams 7 and the upper inverted frame beams 3 of each small cantilever slab 1, and tie them together at the joint; the bottom longitudinal reinforcement 5 of the upper inverted beam is anchored in the post-cast upper inverted frame beams 3.

[0012] The main superimposed upper inverted beam 8 and the main superimposed upper inverted frame beam 9 of the main structure 200 to be connected are tied together with the upper inverted beam stirrups 6 of each beam, and the two are tied together at the joint.

[0013] At the junction of the main structure 200 to be connected with the eaves 100, the upper inverted frame beam 9 on the outer side of the main structure is the upper inverted beam stirrup reserved on the upper part of the cast-in-place frame beam 4 of the main structure, and is tied to the upper inverted beam stirrup of the overlapping upper inverted frame beam 3 on the inner side of the eaves to form a whole.

[0014] (4) The steel reinforcement frame of the rectangular upper inverted beam after binding in step (3) and the steel reinforcement frame of the main rectangular upper inverted beam are poured with composite concrete on site. The composite upper inverted beam 7), the main composite upper inverted beam 8, the composite upper inverted frame beam 3, and the main upper inverted frame beam 9 are connected into a whole structure. The main upper inverted frame beam 9 and the composite upper inverted frame beam 3 at the connection between the main structure and the large eaves are poured into a frame beam 39, which is located above the main body cast-in-place frame beam 4 and is poured into a whole structure, so that the large eaves and the main structure are poured and connected into a whole structure.

[0015] (5) After the structure poured in step (4) reaches the design strength, remove the temporary supports or cable stays, and the large eaves are completed.

[0016] The construction method of a prefabricated assembled structure with a long overhanging eaves is described above. In step (1), the width of each small cantilever slab 1 is 2 / 3 of the span length. Two longitudinal overlapping upper anti-reverse beams are symmetrically arranged at 1 / 4 of the width from both sides of the small cantilever slab 1. Two transverse overlapping upper anti-reverse frame beams are arranged along the inner and outer sides of the small cantilever slab 1.

[0017] The construction method of a prefabricated assembled structure with a long overhanging eaves is described above. In step (2), the splicing of the large overhanging eaves involves first splicing two small cantilever slabs 1 to form the first span AB, with the splicing seam in the center of the span. The position of the overlapping upper anti-beam on the outer side of the two small cantilever slabs 1 is at the boundary of the span. Then, the small cantilever slabs 1 are continuously spliced ​​to one side. The splicing seam of the second span BC is symmetrically located on both sides of the center of the span. The splicing seam of the third span CD is again located in the center of the span. The splicing seam of the fourth span is again symmetrically located on both sides of the center of the span. This process is repeated. The overlapping upper anti-beam frame beam on the inner side of the small cantilever slab is connected to the upper anti-beam frame beam of the main structure on the side of the main structure to form a whole.

[0018] The construction method of a prefabricated assembled structure with a long overhanging eaves is described above. In step (3), the binding of the upper inverted beam stirrups 6 is as follows: the upper inverted beam, the upper inverted frame beam, the main upper inverted beam 8, and the main upper inverted frame beam 9 are each connected by binding the upper reinforcement and the waist reinforcement along the length and width of the beam to the multiple upper inverted beam stirrups 6 on a single beam; at the same time, the upper inverted beam stirrups 6 at the beam-to-beam connection are bound together; the bottom longitudinal reinforcement 5 of the upper inverted beam is anchored in the post-cast upper inverted frame beam 3.

[0019] The construction method of a prefabricated assembled structure with a long overhanging eaves is described above, wherein it is used for multi-span or single-span splicing structures with long overhanging eaves.

[0020] The aforementioned prefabricated assembled structure with a long overhanging eaves on the roof includes a main structure to be assembled and a long overhanging eaves; characterized in that,

[0021] The large eaves 100 are horizontally divided into multiple small cantilever slabs 1 spliced ​​together; the small cantilever slabs 1 are precast slab structures, and each small cantilever slab 1 has a pre-reserved longitudinal superimposed upper inverted beam 7 steel reinforcement frame and a transverse superimposed upper inverted frame beam 3 steel reinforcement frame, forming a rectangular upper inverted beam steel reinforcement frame; the main structure 200 to be connected has a pre-reserved longitudinal main superimposed upper inverted beam 8 steel reinforcement frame and a transverse main superimposed upper inverted frame beam 9 steel reinforcement frame, corresponding to the superimposed upper inverted beam 7 of the large eaves, forming multiple main rectangular upper inverted beam steel reinforcement frames.

[0022] The outer side of the large eaves is suspended, and the inner side is assembled and spliced ​​with the main structure to be connected; the bottom end of the precast slab on the inner side of the small cantilever slab 1 is supported and connected by the corbel of the main cast-in-place edge frame beam 4 at the bottom of the connection point of the main structure to be connected; the bottom main structure frame beam 300 extends to the bottom of the large eaves for connection and support; the composite upper inverted beam is installed correspondingly to the steel frame of the main composite upper inverted beam, and the steel frame of the main composite upper inverted frame beam 9 integrally connected above the main cast-in-place edge frame beam 4 is connected to the steel frame of the composite upper inverted frame beam 3 on the inner side of the small cantilever slab; by binding and casting the steel frame, an integrated structure is formed by the interconnection of the composite upper inverted beam, the composite upper inverted frame beam, the main composite upper inverted beam, and the main composite upper inverted frame beam, and the main composite upper inverted frame beam, and an overall structure is formed by the assembly and connection of the main structure and the large eaves.

[0023] The prefabricated assembly structure with a long overhanging eaves of the roof is described above, wherein the width of each small cantilever slab 1 is 2 / 3 of the span length; two longitudinal overlapping upper inverted beams are symmetrically arranged at 1 / 4 of the width from both sides of the small cantilever slab 1, and two transverse overlapping upper inverted frame beams are arranged along the inner and outer sides of the small cantilever slab 1; structural longitudinal reinforcement 2 and transverse reinforcement are provided inside the prefabricated slab of the small cantilever slab 1.

[0024] The prefabricated assembly structure for a long overhanging roof is characterized in that, when splicing the long overhanging eaves, two small cantilever slabs 1 are first spliced ​​together to form the first span AB, with the splicing seam in the center of the span. The position of the overlapping upper anti-reverse beam on the outer side of the two small cantilever slabs 1 is at the boundary of the span. Then, the small cantilever slabs 1 are continuously spliced ​​to one side. The splicing seam of the second span BC is symmetrically located on both sides of the center of the span. The splicing seam of the third span CD is again located in the center of the span. The splicing seam of the fourth span is again symmetrically located on both sides of the center of the span. This process is repeated. The upper anti-reverse frame beam 9 of the main structure and the overlapping upper anti-reverse frame beam 3 at the connection between the main structure and the long overhanging eaves are cast into a single frame beam 39. The frame beam 39 is located above the cast-in-place frame beam 4 of the main structure and is cast into a single structure.

[0025] The aforementioned prefabricated assembly structure for a long overhanging roof includes a steel reinforcement frame consisting of upper inverted beam stirrups 6 pre-reserved along the beam at the top of the prefabricated slab or main structural slab, and lower inverted beam bottom longitudinal reinforcement 5 pre-reserved along the beam at the bottom of the prefabricated slab or main structural slab. The steel reinforcement frame is tied by connecting multiple upper inverted beam stirrups 6 on each beam (overlapping upper inverted beam, upper inverted frame beam, main overlapping upper inverted beam 8, and main overlapping upper inverted frame beam 9) with upper and lower beam reinforcement along the beam's length and width. Simultaneously, the upper inverted beam stirrups 6 at beam-to-beam joints are tied together. The lower longitudinal reinforcement 5 of the upper inverted beam is anchored in the post-cast overlapping upper inverted frame beam 3. For long overhanging roofs, this invention employs a composite upper inverted beam + prefabricated slab load-bearing configuration.

[0026] Effects of the present invention

[0027] The beneficial effects of this invention are that the large overhanging roof components are prefabricated and maintained in the factory, which can effectively control the quality of concrete pouring, shrinkage and deformation, or achieve a one-time molding fair-faced concrete effect. After being transported to the site for on-site assembly, the building's appearance and the quality of the finished components will be greatly improved. Moreover, it has less environmental pollution and is less affected by climate, meeting the requirements of green building. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the planar segmentation of the prefabricated small cantilever slab of the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of section 1-1,

[0030] Figure 3 for Figure 1 Schematic diagram of section 2-2,

[0031] Figure 4 This is a schematic diagram of a single template for the prefabricated small cantilever slab of the present invention.

[0032] Figure 5 This is a schematic diagram showing the longitudinal and transverse stress distribution of the upper part of the precast small cantilever slab and the reserved plan of the stirrups for the upper inverted composite beam of the present invention.

[0033] Figure 6 This is a schematic diagram showing the longitudinal and transverse stress distribution of the lower part of the precast small cantilever slab of the present invention, as well as the reserved plan of the bottom reinforcement and stirrups of the upper inverted composite beam.

[0034] Figure 7 for Figure 4-6 Schematic diagram of cross-section 3-3 of the prefabricated small cantilever slab of the present invention.

[0035] Figure 8 for Figure 4-6 Schematic diagram of cross-section 4-4 of the prefabricated small cantilever slab of the present invention.

[0036] Figure 9 This is a schematic diagram illustrating the pre-reservation and binding of reinforcing bars for the inverted beam on the precast small cantilever slab of the present invention.

[0037] Figure 10 This is a schematic diagram showing the reserved reinforcement layer on the side frame beam of the main structure of the present invention.

[0038] Figure 11 This is a schematic diagram showing the pre-reservation and binding of the anti-overlapping layer of reinforcing bars on the side frame beam of the main structure of this invention.

[0039] Figure 12 This is a schematic plan view of the completed casting of the inverted overlapping beams on the small cantilever slab and the inverted overlapping beams on the side beams of the present invention.

[0040] Figure 13 This is a schematic cross-sectional view of the completed casting of the anti-overlapping beam on the small cantilever slab and the anti-overlapping beam on the side beam of the present invention.

[0041] Explanation of the attached drawing numbers:

[0042] Large eaves 100, main structure frame beam 200, bottom main structure frame beam 300, small cantilever slab 1, structural longitudinal reinforcement 2, connecting section 201, superimposed upper inverted frame beam 3, main cast-in-place edge frame beam 4, bottom longitudinal reinforcement of upper inverted beam 5, stirrups of upper inverted beam 6, superimposed upper inverted beam 7, main superimposed upper inverted beam 8, main superimposed upper inverted frame beam 9, frame beam 39;

[0043] to to or to The span is defined as follows: span 1 (AB), span 2 (BC), span 3 (CD); L represents the length of the precast cantilever slab. Detailed Implementation

[0044] To clearly understand the technical solution of the present invention, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] This invention discloses a construction method for a prefabricated assembled structure with a long overhanging eave. The long overhanging eave 100 utilizes overlapping upper inverted beams to connect prefabricated slabs, and the eave is integrated with the main structure through overlapping and pouring with the main structure's frame beam 200. The construction steps are as follows: See [link to construction method]. Figure 1 , 12 As shown,

[0046] (1) The large overhang 100 is divided into multiple small cantilever slabs 1 in the horizontal direction and processed into precast slabs in the factory; the upper part of each small cantilever slab 1 is reserved with a longitudinally stacked upper inverted beam 7 steel reinforcement frame and a transversely stacked upper inverted frame beam 3 steel reinforcement frame to form a rectangular upper inverted beam steel reinforcement frame; the structural longitudinal reinforcement 2 of the precast slab has a reserved protruding connecting section 201 on the inner end face where it connects with the main structure; see Figure 5 , 8 As shown,

[0047] The main structure 200 to be connected has a longitudinal main structure superimposed ...

[0048] The aforementioned steel reinforcement frame consists of upper inverted beam stirrups 6 pre-reserved along the beam at the top of the precast slab or main structural slab, and upper inverted beam bottom longitudinal reinforcement 5 pre-reserved along the beam at the bottom of the precast slab or main structural slab; see also Figure 6 , 7 ;

[0049] (2) Transport the prefabricated small cantilever slabs 1 from step (1) to the site, and hoist the prefabricated small cantilever slabs 1 one by one to splice the large eaves 100 on site. The inner bottom of the small cantilever slabs 1 is simply supported by the corbel of the transverse cast-in-place frame beam 4 at the bottom of the main structure to be connected, and temporary supports or inclined cables are provided on its outer side for temporary fixation. The bottom main structure frame beam 300 extends to the bottom of the eaves for connection support; see Figure 1 , 2 As shown in 4 and 10;

[0050] (3) After the splicing of the large eaves in step (2) is completed, tie the stirrups 6 of the upper inverted beams 7 and 3 of each small cantilever slab 1, and tie them together at the joint; the bottom longitudinal reinforcement 5 of the upper inverted beam is anchored to the post-cast 3 of the ...

[0051] The main superimposed upper inverted beam 8 and the main superimposed upper inverted frame beam 9 of the main structure 200 to be connected are tied together with the upper inverted beam stirrups 6 of each beam, and the two are tied together at the joint.

[0052] At the junction of the main structure 200 to be connected with the eaves 100, the upper inverted frame beam 9 on the outer side of the main structure is the upper inverted beam stirrup reserved on the upper part of the cast-in-place frame beam 4 of the main structure, and is tied to the upper inverted beam stirrup of the overlapping upper inverted frame beam 3 on the inner side of the eaves to form a whole.

[0053] (4) The steel reinforcement frame of the rectangular upper inverted beam after binding in step (3) and the steel reinforcement frame of the main rectangular upper inverted beam are poured with composite concrete on site. The composite upper inverted beam 7, the main composite upper inverted beam 8, the composite upper inverted frame beam 3, and the main upper inverted frame beam 9 are connected into a whole structure (see figure). Figure 12 The main upper frame beam 9 and the superimposed upper frame beam 3 at the junction of the main structure and the eaves are cast into a single frame beam 39. The frame beam 39 is located above the cast-in-place frame beam 4 of the main structure and is cast into a single structure, so that the eaves and the main structure are cast into a single structure.

[0054] (5) After the structure poured in step (4) reaches the design strength, remove the temporary supports or cable stays, and the large eaves are completed.

[0055] The construction method of a prefabricated assembled structure with a long overhanging eave on the roof, wherein in step (1), the width of each small cantilever slab 1 is 2 / 3 of the span length; two longitudinal overlapping upper inverted beams are symmetrically arranged at 1 / 4 width from both sides of the small cantilever slab 1; two transverse overlapping upper inverted frame beams are arranged along the inner and outer sides of the small cantilever slab 1. See also Figure 1 , 4 As shown;

[0056] The construction method for a prefabricated assembled structure with a long overhanging eave on the roof is described in the following document. Figure 1 As shown, in step (2), the splicing of the large-sized eaves involves first splicing two small cantilever slabs 1 to form the first span AB, with the splicing seam in the center of the span. The position of the overlapping upper anti-beam on the outer side of the two small cantilever slabs 1 is at the boundary of the span. Then, the small cantilever slabs 1 are continuously spliced ​​to one side. The splicing seam of the second span BC is symmetrically positioned on both sides of the center of the span. The splicing seam of the third span CD is again in the center of the span. The splicing seam of the fourth span is again symmetrically positioned on both sides of the center of the span. This process is repeated. The overlapping upper anti-beam frame beam on the inner side of the small cantilever slab is connected to the upper anti-beam frame beam of the main structure on the side of the main structure to form a whole.

[0057] The construction method of a prefabricated assembled structure with a long overhanging eaves is described above. In step (3), the binding of the upper inverted beam stirrups 6 is as follows: the upper inverted beam, the upper inverted frame beam, the main upper inverted beam 8, and the main upper inverted frame beam 9 are each connected by binding the upper and lower reinforcing bars along the length and width of the beam to the upper stirrups 6 of each beam; at the same time, the upper inverted beam stirrups 6 at the beam-to-beam connection are bound together; the bottom longitudinal reinforcement 5 of the upper inverted beam is anchored in the post-cast upper inverted frame beam 3; see also Figure 9 ;

[0058] The construction method of a prefabricated assembled structure with a long overhanging eaves is described above, wherein it is used for multi-span or single-span splicing structures with long overhanging eaves.

[0059] The aforementioned prefabricated assembled structure with a long overhanging eave includes a main structure to be assembled and a long overhanging eave; characterized in that, see [reference needed] Figure 1 , 12 As shown,

[0060] The large eaves 100 are horizontally divided into multiple small cantilever slabs 1 spliced ​​together; the small cantilever slabs 1 are precast slab structures, and each small cantilever slab 1 has a pre-reserved longitudinal superimposed upper inverted beam 7 steel reinforcement frame and a transverse superimposed upper inverted frame beam 3 steel reinforcement frame, forming a rectangular upper inverted beam steel reinforcement frame; the main structure 200 to be connected has a pre-reserved longitudinal main superimposed upper inverted beam 8 steel reinforcement frame and a transverse main superimposed upper inverted frame beam 9 steel reinforcement frame, corresponding to the superimposed upper inverted beam 7 of the large eaves, forming multiple main rectangular upper inverted beam steel reinforcement frames.

[0061] Referring to 1, 2, 3, and 12, the outer side of the large eaves is suspended, and the inner side is assembled and spliced ​​with the main structure to be connected; the bottom end of the precast slab on the inner side of the small cantilever slab 1 is supported and connected by the corbel of the main cast-in-place edge frame beam 4 at the bottom of the connection point of the main structure to be connected; the bottom main structure frame beam 300 extends to the bottom of the large eaves for connection and support; the composite upper inverted beam is installed correspondingly to the steel frame of the main composite upper inverted beam, and the steel frame of the main composite upper inverted frame beam 9 integrally connected above the main cast-in-place edge frame beam 4 is connected to the steel frame of the composite upper inverted frame beam 3 on the inner side of the small cantilever slab; by binding and casting the steel frame, an integrated structure is formed by the interconnection of the composite upper inverted beam, the composite upper inverted frame beam, the main composite upper inverted beam, and the main composite upper inverted frame beam, and the main composite upper inverted frame beam, and an overall structure is formed by the assembly and connection of the main structure and the large eaves.

[0062] The aforementioned prefabricated assembly structure with a long overhanging eaves on the roof, see [link to relevant documentation]. Figure 1 , 4 7, 8, 9, wherein the width of each small cantilever slab 1 is 2 / 3 of the span length; two longitudinal overlapping upper inverted beams are symmetrically arranged at 1 / 4 width from both sides of the small cantilever slab 1, and two transverse overlapping upper inverted frame beams are arranged along the inner and outer sides of the small cantilever slab 1 (which can be cast in place); the precast slab of the small cantilever slab 1 is provided with structural longitudinal reinforcement 2 and transverse reinforcement as shown in the figure. Figure 5 , 6 .

[0063] The aforementioned prefabricated assembly structure with a long overhanging eaves on the roof, see [link to relevant documentation]. Figure 1 The splicing of the large eaves involves first splicing two small cantilever slabs 1 to form the first span AB, with the splicing seam in the center of the span. The position of the overlapping upper anti-reverse beam on the outer side of the two small cantilever slabs 1 is at the boundary of the span. Then, the small cantilever slabs 1 are continuously spliced ​​to one side. The splicing seam of the second span BC is symmetrically located on both sides of the center of the span. The splicing seam of the third span CD is again located in the center of the span. The splicing seam of the fourth span is again symmetrically located on both sides of the center of the span. This process is repeated. The upper anti-reverse frame beam 9 and the overlapping upper anti-reverse frame beam 3 at the connection between the main structure and the large eaves are cast as a single frame beam 39. The frame beam 39 is located above the cast-in-place frame beam 4 of the main structure and is cast as a single structure.

[0064] The aforementioned prefabricated assembly structure with a long overhanging eaves on the roof, see [link to relevant documentation]. Figure 79. The steel reinforcement frame consists of upper inverted beam stirrups 6 pre-reserved along the beam at the top of the precast slab or main structural slab, and lower inverted beam bottom longitudinal reinforcement 5 pre-reserved along the beam at the bottom of the precast slab or main structural slab. The steel reinforcement frame is tied by connecting multiple upper inverted beam stirrups 6 on each beam (overlapping upper inverted beam, upper inverted frame beam, main overlapping upper inverted beam 8, and main overlapping upper inverted frame beam 9) together by tying the upper and lower beam reinforcement bars along the beam's length and width. Simultaneously, the upper inverted beam stirrups 6 at the beam-to-beam joints are tied together. The lower longitudinal reinforcement 5 of the upper inverted beam is anchored in the post-cast overlapping upper inverted frame beam 3. For long roof eaves, this invention adopts a load-bearing form of overlapping upper inverted beams + precast slabs.

[0065] Connection methods, connection techniques, and construction methods not detailed in this invention shall be understood in accordance with the conventional methods of existing technology and will not be elaborated further.

Claims

1. A construction method of a prefabricated assembly structure of a long and large overhanging eave of a roof, characterized in that, The large eave is connected with the main structure by the method of overlapping and pouring, and the large eave and the main structure are connected into an integral structure; The construction steps are as follows: (1) the large eave (100) is divided into a plurality of small cantilever plates (1) in the transverse direction in a factory, and the small cantilever plates (1) are processed into prefabricated plates; the upper reverse beam (7) and the upper reverse side frame beam (3) of each small cantilever plate (1) are reserved with a steel reinforcement frame in the longitudinal direction and the transverse direction respectively, and the steel reinforcement frame is a rectangular upper reverse beam; the structure longitudinal reinforcement (2) of the prefabricated plate is reserved with a connecting section (201) extending out from the inner side end surface of the main structure; The main structure (200) to be connected is reserved with a steel reinforcement frame of the main body overlapping upper reverse beam (8) in the longitudinal direction and the main body overlapping upper reverse side frame beam (9) in the transverse direction, and the steel reinforcement frame is a plurality of main body rectangular upper reverse beam steel reinforcement frames; The steel reinforcement frame is an upper reverse beam stirrup (6) reserved on the upper part of the prefabricated plate or the main structure plate along the beam, and an upper reverse beam bottom longitudinal reinforcement (5) reserved on the bottom of the prefabricated plate or the main structure plate along the beam; (2) the small cantilever plates (1) processed in step (1) are transported to the site, and the large eave (100) is spliced by hoisting and splicing the prefabricated small cantilever plates (1) one by one; the inner side bottom end of the small cantilever plate (1) is supported by the bracket of the main body cast-in-place side frame beam (4) in the transverse direction at the bottom of the connection of the main structure to be connected as an inner support, and the outer side is provided with temporary support or temporary fixing by a stay cable; the main body structure side frame beam (300) extends to the bottom of the large eave to connect and support; (3) after the large eave is spliced in step (2), the upper reverse beam stirrup (6) of each small cantilever plate (1) overlapping upper reverse beam (7) and overlapping upper reverse side frame beam (3) is bound and connected together at the connection position; the upper reverse beam bottom longitudinal reinforcement (5) is anchored in the overlapping upper reverse side frame beam (3) poured later; The upper reverse beam stirrup (6) of the main body overlapping upper reverse beam (8) and the main body overlapping upper reverse side frame beam (9) of the main structure to be connected is bound and connected together at the connection position; The main body upper reverse side frame beam (9) of the main structure on the outer side at the connection position of the main structure to be connected and the large eave (100) is an upper reverse beam stirrup reserved on the upper part of the main body cast-in-place side frame beam (4), and is bound and connected with the upper reverse beam stirrup of the overlapping upper reverse side frame beam (3) on the inner side of the large eave as an integral structure; (4) the steel reinforcement frame of the rectangular upper reverse beam and the main body rectangular upper reverse beam steel reinforcement frame bound in step (3) is poured with a site overlapping layer concrete, and the overlapping upper reverse beam (7), the main body overlapping upper reverse beam (8), the overlapping upper reverse side frame beam (3) and the main body upper reverse side frame beam (9) connected as an integral structure are poured and formed, the main body upper reverse side frame beam (9) and the overlapping upper reverse side frame beam (3) at the connection position of the main structure and the large eave are poured as an integral structure side frame beam (39), the side frame beam (39) is located above the main body cast-in-place side frame beam (4) and is poured as an integral structure, so that the large eave and the main structure are poured and connected as an integral structure. (5) After the structure of step (4) reaches the design strength, the temporary support or cable-stayed cable is removed, and the large eaves implementation is completed.

2. A method of constructing a prefabricated assembly of a roof with a long projecting eave according to claim 1, characterized in that, In step (1), the width of each small cantilevered plate (1) is 2 / 3 of the length of the span; the longitudinally superimposed upper reverse beams are symmetrically arranged at 1 / 4 of the width of the small cantilevered plate (1) from both sides; and the transversely superimposed upper reverse frame beams are arranged at the inner side and the outer side of the small cantilevered plate (1).

3. A method of constructing a prefabricated assembly of a roof with a long cantilevered eave according to claim 2, characterized in that, In step (2), the large eaves of large size are spliced by first splicing two small cantilevered plates (1) into the first span (A-B), with the splicing joint in the middle of the span, and the positions of the superimposed upper reverse beams on the outer sides of the two small cantilevered plates (1) being at the boundary positions of the span; then continuously splicing the small cantilevered plates (1) to one side, with the splicing joint of the second span (B-C) being symmetrically arranged at the two sides of the middle of the span, the splicing joint of the third span (C-D) being arranged at the middle of the span, and the splicing joint of the fourth span being symmetrically arranged at the two sides of the middle of the span; and the process is repeated. The superimposed upper reverse frame beams on the inner side of the small cantilevered plate are connected to the upper reverse frame beams on the side of the main body structure.

4. A method of constructing a pre-fabricated assembly of a roof with a long cantilevered eave according to claim 3, wherein, In step (3), the upper reverse beam stirrups (6) are bound by connecting the superimposed upper reverse beams, the upper reverse frame beams, the main body superimposed upper reverse beams (8), and the main body superimposed upper reverse frame beams (9) to the upper reverse beam stirrups (6) on the single beam through the beam upper stirrups and the beam waist stirrups arranged along the length and width of the beam; the upper reverse beam stirrups (6) at the connection between the beams are also bound; and the upper reverse beam bottom longitudinal reinforcement (5) is anchored in the superimposed upper reverse frame beams (3) poured later.

5. The method of construction of a prefabricated assembled structure of a long projecting roof eave according to claim 1, characterized in that, The structure is used for the splicing of large eaves multi-span or single-span structures.

6. The prefabricated assembly structure of a long large eaves roof according to claim 1, comprising a main body structure to be connected and a large eaves; characterized in that, the large eaves (100) are connected by splicing a plurality of small cantilevered plates (1) in the transverse direction; the small cantilevered plates (1) are prefabricated plate structures, each small cantilevered plate (1) having a steel reinforcement frame of longitudinally superimposed upper reverse beams (7) and a steel reinforcement frame of transversely superimposed upper reverse frame beams (3) on the upper surface, forming a rectangular upper reverse beam steel reinforcement frame; and the plate body of the main body structure (200) to be connected has a steel reinforcement frame of longitudinally main body superimposed upper reverse beams (8) and a steel reinforcement frame of transversely main body superimposed upper reverse frame beams (9) on the upper surface, corresponding to the superimposed upper reverse beams (7) of the large eaves, forming a plurality of main body rectangular upper reverse beam steel reinforcement frames. The large eave is suspended outside and assembled and spliced with the main body structure to be connected at the inside; the bracket of the main body cast-in-place frame beam (4) at the bottom of the transverse main body at the bottom of the connection of the prefabricated plate end of the inside of the small cantilevered plate (1) to be connected is used as the inner support to support and connect; the bottom main body frame beam (300) extends to the bottom connection support of the large eave; the corresponding steel frame of the main body cast-in-place frame beam of the superimposed upper reverse beam is installed, the steel frame of the main body superimposed upper reverse frame beam (9) integrally connected above the main body cast-in-place frame beam (4) is butt-jointed and installed with the steel frame of the superimposed upper reverse frame beam (3) of the inside of the small cantilevered plate; the mutually connected integral structure of the superimposed upper reverse beam, the superimposed upper reverse frame beam, the main body superimposed upper reverse beam and the main body superimposed upper reverse frame beam is formed by binding the steel frame and pouring, and the overall structure of the main body structure and the assembled connection of the large eave is formed.

7. A prefabricated assembly structure of long and large overhanging eave of a roof according to claim 6, characterized in that, The width of each small cantilevered plate (1) is 2 / 3 of the length of the span; the two symmetrical superimposed upper reverse beams in the longitudinal direction are arranged at 1 / 4 of the width from the two sides of the small cantilevered plate (1); the two superimposed upper reverse frame beams in the transverse direction are arranged along the length of the inside edge and the outside edge of the small cantilevered plate (1); the structural longitudinal reinforcement (2) and the transverse reinforcement are arranged in the prefabricated plate of the small cantilevered plate (1).

8. A prefabricated assembly structure of long and large overhanging eave of a roof according to claim 7, characterized in that, The large eave is spliced by first splicing two small cantilevered plates (1) into the first span (A-B), the splicing joint is in the middle of the span, and the positions of the superimposed upper reverse beams of the two small cantilevered plates (1) outside are at the boundary positions of the span; then the small cantilevered plates (1) are continuously spliced by extending to one side, the splicing joint of the second span (B-C) is symmetrically arranged at the two sides of the middle of the span, the splicing joint of the third span (C-D) is arranged at the middle of the span, and the splicing joint of the fourth span is symmetrically arranged at the two sides of the middle of the span; the process is repeated; the main body upper reverse frame beam (9) and the superimposed upper reverse frame beam (3) at the connection of the main body structure and the large eave are integrally poured into the frame beam (39), and the frame beam (39) is located above the main body cast-in-place frame beam (4) and integrally poured.

9. A prefabricated assembly structure of a long and large overhanging eave of a roof according to claim 8, characterized in that, The steel frame is the upper reverse beam stirrup (6) reserved on the upper part of the beam of the prefabricated plate or the main body structure plate and the upper reverse beam bottom longitudinal reinforcement (5) reserved on the bottom of the prefabricated plate or the main body structure plate; the binding of the steel frame is that the superimposed upper reverse beam, the upper reverse frame beam, the main body superimposed upper reverse beam (8) and the main body superimposed upper reverse frame beam (9) are respectively integrally connected with the multiple upper reverse beam stirrups (6) on a single beam through the binding of the beam upper reinforcement and the beam waist reinforcement arranged along the length and width of the beam; meanwhile, the upper reverse beam stirrups (6) at the connection of the beams are integrally connected by binding; the upper reverse beam bottom longitudinal reinforcement (5) is anchored in the superimposed upper reverse frame beam (3) poured later.

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