Prefabricated floor small slope roof structure, construction method and prefabricated floor

Abstract

The application discloses a prefabricated floor small-gradient roof structure, a construction method and a prefabricated floor, which comprise a frame beam and a plurality of prefabricated floors arranged on the frame beam, the prefabricated floors are continuously arranged in rows along the gradient direction of a slope roof, and the prefabricated floors in the rows are arranged at intervals along a direction perpendicular to the gradient direction. The prefabricated floor comprises a floor body, the front end and the tail end of the floor body are extended downward into longitudinal sections and are further bent outward to form butt joint parts, the butt joint parts of two adjacent prefabricated floors in each row are relatively combined to form a filling area surrounded by the longitudinal sections and the butt joint parts, gaps are formed between the prefabricated floors and the frame beam, and the gaps and the filling area are communicated with the gaps on the two sides of each row of the prefabricated floors. Concrete is filled in the gaps, the gaps and the filling area, so that the prefabricated floors and the frame beam and the two adjacent prefabricated floors are fixedly connected through the concrete. The application has simple and compact structure, meets safety requirements, is simple and convenient to assemble on site, reduces construction difficulty and labor intensity, and improves work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to a prefabricated floor small slope roof structure, and also relates to a construction method of the prefabricated floor small slope roof structure, and further relates to a prefabricated floor used by the prefabricated floor small slope roof structure. BACKGROUND

[0002] With the development of the construction industry, people's life needs are diversified, and in recent years, many novel and unique slope roof structures have appeared in architectural design.

[0003] The construction method of the traditional slope roof structure is to lay a slope bottom formwork on the frame beam or set a layer of steel wire mesh on the frame beam, and then form by pouring and tamping, so this construction method has the following defects:

[0004] (1) The construction method is only suitable for low slope roof.

[0005] (2) In the construction process, it is easy to cause concrete to slide off or segregate, and there are problems such as difficulty in controlling pouring density, poor construction quality, etc.

[0006] (3) The pouring process is quite complicated, and there are problems such as long time consumption and high labor intensity of workers. SUMMARY

[0007] The first object of the present application is to provide a prefabricated floor small slope roof structure which is simple in structure, simple and convenient in construction, ensures construction quality, reduces labor intensity, reduces cost, and improves work efficiency.

[0008] The first object of the present application is achieved by the following technical scheme: a prefabricated floor small slope roof structure, characterized in that it comprises a frame beam and a plurality of prefabricated floors laid on the frame beam, the prefabricated floors are arranged in columns continuously along the slope direction of the slope roof, and a plurality of columns of prefabricated floors are arranged at intervals perpendicular to the slope direction, the prefabricated floor comprises a plate main body, the front end and the tail end of the plate main body are extended downward into longitudinal sections and then bent outward to form butt joint parts, the butt joint parts of adjacent two prefabricated floors in each column are relatively combined to form a filling area enclosed by the longitudinal sections and the butt joint parts, there is a gap between the prefabricated floor and the frame beam, and each column of prefabricated floors has a gap on both sides which is communicated with the gap and the filling area, and the gap, the gap and the filling area are filled with concrete, so that each prefabricated floor and the frame beam, and adjacent two prefabricated floors are fixedly connected by the concrete.

[0009] The prefabricated floor slope roof structure is made of the assembly type concrete prefabricated floor, has simple and compact structure, reasonable design layout, meets safety requirements, is simple and convenient to assemble on site, compared with the construction mode and structure system of the traditional floor site pouring, reduces the wet work load and formwork work load, reduces the construction difficulty and labor intensity, shortens the construction period, improves the work efficiency, and moreover, the prefabricated floor slope roof structure has good drainage performance, prevents rain leakage, and can select prefabricated floors of different specifications according to actual construction needs, can be applied to the slope roof structure with a slope less than 9 degrees, and has high applicability.

[0010] The concrete in the gap, the gap and the filling area is micro-expansion concrete and is once-poured, that is, the micro-expansion concrete is cast in place on the frame beam to form the composite beam.

[0011] In order to improve the connecting strength between the two adjacent prefabricated floors, the plate surface steel bars parallel to the slope direction are arranged in the plate body of the prefabricated floor, the two ends of the plate surface steel bars extend out of the two sides of the longitudinal section and enter the filling area, the plate surface steel bars of the two adjacent prefabricated floors in each column have a height difference and are connected through the connecting steel bars.

[0012] The abutting portions of the two adjacent prefabricated floors in each column have the gap communicated with the filling area, the gap is filled with the micro-expansion concrete, in order to further improve the structural strength, the first steel bars perpendicular to the slope direction are arranged in the filling area, the first steel bars are respectively located at the top and the bottom of the filling area, the L-shaped stirrups are arranged in the abutting portions of the prefabricated floor, and the second steel bars perpendicular to the slope direction are arranged on the inner side of the L-shaped stirrups.

[0013] The beam surface bars and the beam bottom bars perpendicular to the slope direction are arranged in the abutting portions of the prefabricated floor, the beam surface bars and the beam bottom bars extend into the concrete in the gap, when the frame beam is the double-sided frame beam, the two beam surface bars and the two beam bottom bars of the two adjacent prefabricated floors in each column have a height difference and are connected through the connecting steel bars, when the frame beam is the single-sided frame beam, the beam surface bars and the beam bottom bars of the prefabricated floor are connected with the supporting steel bars through the connecting steel bars.

[0014] The present application anchors the insert bar at the top of the superposed beam, the insert bar is a closed stirrup formed by the cross connection of two U-shaped stirrups, one of the U-shaped stirrups is a first U-shaped stirrup which is located at the inner top end of the frame beam, a plurality of third steels are bound on the inner side of the first U-shaped stirrup, the other U-shaped stirrup is a second U-shaped stirrup, the lower part of which is located in the frame beam and extends into the first U-shaped stirrup to connect with it, and the upper part of which extends out of the frame beam into the concrete part, a plurality of fourth steels are bound on the inner side of the second U-shaped stirrup, the beam surface steel and the beam bottom steel of the prefabricated floor extend into the closed part of the insert bar and are bound with the insert bar, when the frame beam is a single-sided frame beam, the supporting steel is located in the closed part of the insert bar.

[0015] The present application is provided with rubber pads between the bottom surface of the butt joint of the prefabricated floor and the frame beam to increase the gap so as to increase the contact area of the slightly expanded concrete between the prefabricated floor and the frame beam.

[0016] The present application is provided with rubber pads between the bottom surface of the butt joint of the prefabricated floor and the frame beam to increase the gap so as to increase the contact area of the slightly expanded concrete between the prefabricated floor and the frame beam.

[0017] The second object of the present application is to provide a construction method of the prefabricated floor small slope roof structure.

[0018] The second object of the present application is achieved by the following technical solution: a construction method of the prefabricated floor small slope roof structure, characterized by comprising the following steps:

[0019] S1, manufacturing the prefabricated floor in a factory;

[0020] S2, pouring the main body frame of the slope roof structure on site;

[0021] S3, transporting the prefabricated floor to the construction site and hoisting it to the frame beam of the main body frame, so that the prefabricated floors are continuously arranged in rows along the slope direction of the slope roof, the butt joints of the adjacent two prefabricated floors in each row are relatively combined to form a filling area, the prefabricated floor has a gap with the frame beam, and a plurality of rows of prefabricated floors are arranged at intervals perpendicular to the slope direction, the two sides of each row of prefabricated floors have a gap, and the gap is communicated with the gap and the filling area;

[0022] S4, fixing the prefabricated floor on the frame beam;

[0023] S5, pouring concrete into the gap, filling the gap between the prefabricated floor and the frame beam, filling the area, so that the prefabricated floor and the frame beam, the adjacent two prefabricated floors are connected by concrete, and the slope roof is formed;

[0024] S6, setting a waterproof layer on the slope roof.

[0025] The third object of the present application is to provide a prefabricated floor for the prefabricated floor small slope roof structure.

[0026] The third object of the present application is achieved by the following technical solution: a prefabricated floor for the prefabricated floor small slope roof structure, characterized in that it comprises a plate main body, the front end and the tail end of the plate main body are extended downward into a longitudinal section and then bent outward to form a butt joint part.

[0027] The present application is provided with a plate surface steel bar parallel to the slope direction in the plate main body of the prefabricated floor, the two ends of the plate surface steel bar extend out of the two sides of the plate main body; a plurality of L-shaped stirrups arranged in parallel to the vertical direction of the slope are arranged in the butt joint part of the prefabricated floor, and the inner side of the L-shaped stirrup is provided with a second steel bar perpendicular to the slope direction.

[0028] In order to facilitate the hoisting of the prefabricated floor, a beam bottom bar and a beam surface bar perpendicular to the slope direction are arranged in the prefabricated floor, the two ends of the beam bottom bar and the beam surface bar extend out of the two sides of the prefabricated floor, and a plurality of beam lifting ring assemblies are embedded in the prefabricated floor, the beam lifting ring assembly comprises a lifting ring, a lifting bar, a horizontal closing hoop and a plurality of parallel arranged connecting bars, the connecting bars connect the beam surface bar and the beam bottom bar, the horizontal closing hoop embraces the connecting bars, the lifting bar is in the shape of an isosceles trapezoid without a bottom side, the lifting ring is composed of an arch-shaped section in the middle and a pair of horizontal sections, one end of each horizontal section is connected with one end of the arch-shaped section, and the other end extends horizontally, the lifting bar is connected with the arch-shaped section of the lifting ring and the connecting bar, the horizontal section of the lifting ring is connected with the connecting bar, and the arch-shaped section of the lifting ring is also connected with the beam surface bar, and the upper part of the arch-shaped section extends out of the top surface of the prefabricated floor.

[0029] Compared with the prior art, the present application has the following remarkable effects:

[0030] (1) The prefabricated floor slope roof structure of the present application is a slope roof made of prefabricated concrete floor, which has simple and compact structure, reasonable design layout, meets safety requirements, and is simple and convenient to assemble on site. Compared with the traditional floor pouring construction method and structure system, it reduces the amount of wet work and formwork work, reduces the construction difficulty and labor intensity, shortens the construction period, and improves the work efficiency.

[0031] (2) The prefabricated floor slope roof structure has good drainage performance and prevents rain leakage.

[0032] The prefabricated floor slab can be selected according to actual construction needs, and can be applied to a slope roof structure with a slope less than 9 degrees, and has high applicability.

[0033] The rubber pad can ensure that a gap exists between the prefabricated floor slab and the frame beam top surface boss, increase the contact area between the concrete, utilize the concrete to bond the prefabricated floor slab and the frame beam, ensure the connecting strength between the prefabricated floor slab and the frame beam, and cancel the traditional structure form of fixing the prefabricated floor slab by using a closed stirrup.

[0034] The prefabricated floor slab is in a reverse U-shaped structure, and the butt joint part is combined, so that the positioning between two prefabricated floor slabs is more accurate, the structure of the whole slope roof is more compact, the performance of the slope roof is further improved, the load borne by the prefabricated floor slab is borne by the bottom surface of the plate body and the bottom surface of the butt joint part together due to the height difference between the bottom surface of the plate body and the bottom surface of the butt joint part, and the service life of the slope roof is improved, the structure is better than a traditional buckle structure, and the structural strength is higher. BRIEF DESCRIPTION OF DRAWINGS

[0035] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0036] Figure 1 is a side view of a prefabricated floor slab slope roof structure embodiment 1 of the application;

[0037] Figure 2 is Figure 1 is a partial enlarged view of A in FIG. 8;

[0038] Figure 3 is a front view of a prefabricated floor slab slope roof structure embodiment 1 of the application;

[0039] Figure 4 is a front view of a prefabricated floor slab slope roof structure embodiment 2 of the application;

[0040] Figure 5 is a front view of a prefabricated floor slab slope roof structure embodiment 3 of the application;

[0041] Figure 6 is a front view of a prefabricated floor slab slope roof structure embodiment 4 of the application;

[0042] Figure 7 is a front view of a prefabricated floor slab slope roof structure embodiment 5 of the application.

[0043] In the figure: 1-frame beam, 2-precast floor, 21-longitudinal section, 22-abutment, 3-concrete, 4-chloroprene rubber pad, 5-flexible waterproof layer, 6-plate surface reinforcement, 71-connecting reinforcement, 72-L-shaped stirrup, 73-beam surface reinforcement, 74-beam bottom reinforcement, 75-inserted reinforcement, 76-supporting reinforcement, 81-first reinforcement, 82-second reinforcement, 83-third reinforcement, 84-fourth reinforcement, 85-fifth reinforcement, 86-sixth reinforcement, 87-seventh reinforcement, 91-hanging ring, 92-hanging reinforcement, 93-horizontal closed stirrup. DETAILED DESCRIPTION

[0044] Example 1

[0045] As Figures 1-3 shown, it is a small slope roof structure of precast floor of the application, which comprises a frame beam 1 and a plurality of precast floors 2 laid on the frame beam 1. It should be noted that the cross section of the frame beam 1 is generally rectangular or T-shaped. In the assembly monolithic frame structure, the frame beam 1 is often made into a rectangular cross section. The precast floors 2 are continuously arranged in a row along the slope direction of the slope roof. A plurality of rows of precast floors 2 are arranged at intervals along the direction perpendicular to the slope direction. It can be understood that a plurality of precast floors 2 are laid on a plurality of frame beams 1 arranged at intervals in a matrix manner. The precast floor 2 comprises a plate body. The front end and the tail end of the plate body extend downward into a longitudinal section 21 and then bend outward to form an abutment 22. The front end and the tail end of the plate body form a reverse U-shaped structure as a whole. This reverse U-shaped structure of the precast floor 2 is suitable for the manufacture of a slope roof with a small slope. The abutments 22 of the adjacent two precast floors in each row are relatively combined to form a filling area enclosed by the longitudinal section 21 and the abutment 22. There is a gap between the precast floor 2 and the frame beam 1. The two sides of each row of precast floors 2 have a gap communicating with the gap and the filling area. The gap, the gap and the filling area are filled with concrete. The precast floors 2 and the frame beams 1, and the adjacent two precast floors 2 are all fixedly connected by the concrete 3, forming a slope roof. A flexible waterproof layer 5 is laid on the top surface of the slope roof. The concrete 3 in the gap, the gap and the filling area is micro-expanding concrete with the same strength grade as the floor beam and slab, and is poured at one time, that is, the micro-expanding concrete is cast in place on the frame beam 1 to form a composite beam.

[0046] A plate surface reinforcement 6 parallel to the slope direction is arranged in the plate body of the precast floor 2. The two ends of the plate surface reinforcement 6 extend out of the two sides of the longitudinal section 21 and into the filling area. The plate surface reinforcements 6 of the adjacent two precast floors 2 in each row have a height difference and are connected by a plurality of parallel arranged connecting reinforcements 71. The connecting reinforcement 71 is fixedly connected with each plate surface reinforcement 6 by welding. The specific welding requirement needs one-sided welding length of 10d. The length of the connecting reinforcement 71 is preferably 300mm, and the diameter of the connecting reinforcement 71 is the same as that of the plate surface reinforcement 6.

[0047] In order to further improve the structural strength, eight first steel bars 81 perpendicular to the slope direction are arranged in the filling area, the first steel bars 81 are arranged in a matrix of two rows and four columns, and are respectively located at the top and bottom of the filling area. The first steel bars 81 are preferably HRB400 with a diameter of 20 mm.

[0048] In order to improve the structural strength of the butt joint part 22, the butt joint part 22 is embedded with L-shaped stirrups 72 with a diameter of 10 mm and a spacing of 200 mm, and the inner side of the L-shaped stirrups has four second steel bars 82 perpendicular to the slope direction and with a diameter of 10 mm. The butt joint part 22 between the two adjacent prefabricated floor slabs has a gap communicating with the filling area, and the gap is filled with micro-expanding concrete with the same strength grade as the floor beam slab. The prefabricated floor slab 2 of this structure can make the positioning between the two prefabricated floor slabs 2 more accurate and make the structure of the entire slope roof more compact, further improving the performance of the slope roof. Due to the height difference between the bottom surface of the slab body and the bottom surface of the butt joint part 22, the load received by the prefabricated floor slab 2 is shared by the bottom surface of the slab body and the bottom surface of the butt joint part 22, thereby improving the service life of the slope roof, which is better than the traditional buckle structure and has higher structural strength.

[0049] The frame beam 1 of the embodiment is a double-sided frame beam, both sides of which are provided with prefabricated floor slabs 2. In the actual construction process, after the prefabricated floor slabs 2 on both sides are hoisted onto the frame beam 1, a gap is left between the butt joint parts 22 of the two adjacent prefabricated floor slabs 2, and a gap is also left between the bottom surface of the butt joint part 22 and the frame beam 1. The beam surface reinforcement 73 and the beam bottom reinforcement 74 perpendicular to the slope direction are arranged in the butt joint part 22 of the prefabricated floor slab 2, the beam surface reinforcement 73 and the beam bottom reinforcement 74 are respectively located above and below the L-shaped stirrups 72, and the beam surface reinforcement 73 and the beam bottom reinforcement 74 both extend into the concrete 3 of the gap. There is a height difference between the two beam surface reinforcements 73 and the two beam bottom reinforcements 74 of the two rows of prefabricated floor slabs 2, and the height difference is connected by a plurality of parallel arranged connecting steel bars 71. The connecting steel bars 71 are fixedly connected with the beam surface reinforcement 73 and the beam bottom reinforcement 74 by welding, and steel bars are arranged in parallel above the beam surface reinforcement 73 and above the beam bottom reinforcement 74.

[0050] The top surface of the frame beam 1 has a plurality of bosses 7, the plurality of bosses 7 are arranged at intervals along the slope direction, the top surface of the boss 7 is parallel to the slope direction, each prefabricated floor slab 2 is arranged on the corresponding boss 7 along the slope direction, the front end and the tail end of the prefabricated floor slab 2 are respectively between adjacent two bosses 7, and a gap is formed between the slab body of the prefabricated floor slab 2 and the top surface of the boss 7.

[0051] In the embodiment, neoprene pads 4 are arranged between the bottom surface of the abutting portion 22 of the prefabricated floor slab 2 and the frame beam 1 to increase the gap so as to increase the contact area of the micro-expansive concrete with the prefabricated floor slab 2 and the frame beam 1. The prefabricated floor slab 2 and the frame beam 1 are bonded by the micro-expansive concrete to ensure the connection strength between the prefabricated floor slab 2 and the frame beam 1, thereby eliminating the structure of the prefabricated floor slab 2 fixed by the closed stirrups in the embodiment 2.

[0052] A construction method of the prefabricated floor slab small slope roof structure, comprising the following steps:

[0053] S1, manufacturing the prefabricated floor slab 2 in a factory; when manufacturing the prefabricated floor slab 2, arranging the slab surface steel bars 6 parallel to the slope direction in the slab body of the prefabricated floor slab 2, the two ends of the slab surface steel bars 6 extending out of the two sides of the longitudinal section 21, arranging the L-shaped stirrups 72 in the abutting portion 22 of the prefabricated floor slab 2, arranging the second steel bars 82 perpendicular to the slope direction in the inner side of the L-shaped stirrups 72, and arranging the beam surface steel bars 73 and the beam bottom steel bars 74 perpendicular to the slope direction in the abutting portion 22 of the prefabricated floor slab 2, the beam surface steel bars 73 and the beam bottom steel bars 74 being arranged above and below the L-shaped stirrups respectively, and the two ends of the beam surface steel bars 73 and the beam bottom steel bars 74 extending out of the two sides of the abutting portion 22.

[0054] S2, pouring the main body frame of the slope roof structure including the frame beam 1 on site, and pouring a plurality of bosses 7 on the top surface of the frame beam 1 when pouring the main body frame of the frame beam 1, the plurality of bosses 7 being arranged in the slope direction at intervals, and the top surface of the boss 7 being parallel to the slope direction.

[0055] S3, transporting the prefabricated floor slab 2 to the construction site and hoisting the prefabricated floor slab 2 to the frame beam 1 by hoisting equipment, i.e. arranging each prefabricated floor slab 2 on the corresponding boss 7 in the slope direction, the front end and the tail end of the prefabricated floor slab 2 being respectively between two adjacent pairs of bosses 7, and the top surface of the prefabricated floor slab 2 and the boss 7 forming a gap, so that the prefabricated floor slab 2 is arranged in a row in the slope direction of the slope roof, the abutting portions 22 of the adjacent two prefabricated floor slabs 2 in each row being relatively combined to form a filling area, and a plurality of rows of prefabricated floor slabs 2 being arranged at intervals perpendicular to the slope direction, each row of prefabricated floor slabs 2 having a gap on the two sides, the gap being communicated with the gap and the filling area.

[0056] S4, fixing the prefabricated floor slab 2 to the frame beam 1, specifically: there is a height difference between the two beam surface steel bars 73 and the two beam bottom steel bars 74 of the adjacent two rows of prefabricated floor slabs 2, and the two beam surface steel bars 73 and the two beam bottom steel bars 74 of the adjacent two rows of prefabricated floor slabs 2 are connected by the connecting steel bars 71; the slab surface steel bars 6 of the adjacent two prefabricated floor slabs 2 in each row have a height difference and are connected by the connecting steel bars 71.

[0057] Neoprene pads 4 are arranged between the bottom surface of the abutting portion 22 of the prefabricated floor slab 2 and the frame beam 1 to increase the gap.

[0058] S5. Pour micro-expansion concrete into the gaps, and at the same time, the micro-expansion concrete fills the gaps between the precast floor slabs 2 and the frame beams 1 and the filling area, so that each precast floor slab 2 and the frame beams 1, and adjacent precast floor slabs 2 are fixedly connected by concrete 3 to form a sloping roof.

[0059] S6. Lay a flexible waterproof layer on the sloping roof.

[0060] Example 2

[0061] like Figure 4 As shown, the difference between the precast floor slab and the small-slope roof structure in this embodiment and that in embodiment 1 is the fixing method between the precast floor slab 2 and the frame beam 1. No neoprene rubber pads are provided. The top surface of the frame beam 1 is anchored with reinforcing bars 75, which are closed stirrups. These closed stirrups are formed by two U-shaped stirrups connected crosswise. One U-shaped stirrup is embedded at the top of the frame beam 1, formed by bending stirrups with a diameter of 12mm and a spacing of 200mm, and its inner surface is bound with multiple spaced HRB600 third reinforcing bars 83 with a diameter of 12mm. The lower part of the other U-shaped stirrup is located in the frame beam 1, while the upper part extends out of the frame beam 1 into the concrete section. It is also formed by bending stirrups with a diameter of 12mm and a spacing of 200mm, and its inner surface is bound with multiple spaced HRB300 fourth reinforcing bars 84 with a diameter of 25mm.

[0062] The beam top reinforcement 73 and beam bottom reinforcement 74 of each precast floor slab 2 extend into the closed part of the dowel bar, and the beam top reinforcement 73 and beam bottom reinforcement 74 are tied with the dowel bar 75. After the tying is completed, micro-expansion concrete is poured in the gap between the two precast floor slabs 2. The micro-expansion concrete in the gap between the precast floor slab 2 and the frame beam 1, the micro-expansion concrete between the two joints 22, and the micro-expansion concrete in the gap between the bottom surface of the joint 22 and the frame beam 1 are poured in one go, so that each precast floor slab 2 forms a pitched roof as a whole.

[0063] The construction method of the precast floor slab with a small slope roof structure in this embodiment differs from that in embodiment 1 in that: in step S4, a neoprene rubber pad 4 is not placed between the precast floor slab 2 and the frame beam 1. Instead, in step S2, when the frame beam 1 is poured, a closed stirrup-type dowel bar 75 is anchored into the top of the frame beam 1, and the beam top reinforcement 73 and beam bottom reinforcement 74 of the precast floor slab 2, which extend into the closed part of the dowel bar, are tied to the dowel bar 75.

[0064] Example 3

[0065] like Figure 5As shown, the difference between the precast floor slab with a small slope roof structure in this embodiment and that in embodiment 2 is that the frame beam 1 in this embodiment is a single-sided frame beam, and the beam top reinforcement 73 and beam bottom reinforcement 74 of the precast floor slab 2 are respectively connected to the supporting reinforcement 76 arranged along the length direction by welding connecting reinforcement 71. The length of the supporting reinforcement 76 is preferably 400mm, and the supporting reinforcement 76 is located in the closed part of the dowel bar.

[0066] Anchor bars 75 are inserted into the top surface of frame beam 1. The anchor bars 75 are closed stirrups, which are formed by two U-shaped stirrups connected in a cross manner. One U-shaped stirrup is embedded in the top of frame beam 1 and is formed by bending stirrups with a diameter of 12mm and a spacing of 200mm. Multiple HRB600 fifth steel bars 85 with a diameter of 12mm are tied to its inner side at intervals. The lower part of the other U-shaped stirrup is located in frame beam 1, and the upper part extends out of frame beam 1 into the concrete part. It is also formed by bending stirrups with a diameter of 12mm and a spacing of 200mm. Multiple HRB500 fifth steel bars 85 with a diameter of 25mm are tied to its inner side at intervals.

[0067] Compared with Example 2, the construction method of this precast floor slab with a small slope roof structure is slightly different in step 4, that is, the beam top reinforcement 73 and beam bottom reinforcement 74 of the precast floor slab 2 are connected to the supporting reinforcement 76 by connecting reinforcement 71.

[0068] Example 4

[0069] like Figure 6 As shown, the difference between the precast floor slab with a small slope roof structure in this embodiment and that in embodiment 1 is that the frame beam 1 in this embodiment is a single-sided frame beam. The beam top reinforcement 73 and beam bottom reinforcement 74 of the precast floor slab 2 are respectively connected to the support reinforcement 76 arranged along the length by welded connecting steel bars 71. The support reinforcement 76 connected to the beam bottom reinforcement 74 is located in the closed part of the dowel bar. The support reinforcement 76 connected to the beam top reinforcement 73 is an inverted L-shaped structure. The bottom end of the inverted L-shaped support reinforcement 76 is anchored into the frame beam 1. In order to supplement the structural strength of the concrete 3 pouring area, multiple spaced seventh steel bars 87 are set above the inverted L-shaped support reinforcement 76. The seventh steel bars 87 are preferably HRB500 with a diameter of 25mm. Multiple spaced steel bars are set on the inner side of the vertical part of the inverted L-shaped support reinforcement 76.

[0070] Compared with Example 1, the construction method of this precast floor slab with a small slope roof structure is slightly different in step 4, that is, the beam top reinforcement 73 and beam bottom reinforcement 74 of the precast floor slab 2 are connected to the supporting reinforcement 76 by connecting reinforcement 71.

[0071] Example 5

[0072] like Figure 7As shown, the beam bottom bar 74 and the beam surface bar 73 perpendicular to the gradient direction are arranged in the butt joint part 22 of the prefabricated floor slab 2, the two ends of the beam bottom bar 74 and the beam surface bar 73 extend out of the two sides of the butt joint part 22 of the prefabricated floor slab 2, and a plurality of beam hanger ring assemblies are embedded in the prefabricated floor slab 2, the beam hanger ring assembly comprises a hanger ring 91, a hanger bar 92, a horizontal closed hoop 93 and a plurality of parallel arranged connecting bars, the connecting bar connects the beam surface bar 73 and the beam bottom bar 74, the horizontal closed hoop 93 embraces the connecting bar, the shape of the hanger bar 92 is an isosceles trapezoid without a bottom side, the hanger ring 91 is composed of a central arch-shaped section and a pair of horizontal sections, one end of each horizontal section is connected with one end of the arch-shaped section, and the other end extends horizontally, the hanger bar 92 is connected with the connecting bar and the arch-shaped section of the hanger ring 91, the horizontal section of the hanger ring 91 is connected with the connecting bar, the arch-shaped section of the hanger ring 91 is further connected with the beam surface bar 73, and the upper part of the arch-shaped section extends out of the top surface of the prefabricated floor slab 2.

[0073] The plate surface steel bar 6 parallel to the gradient direction is arranged in the plate main body of the prefabricated floor slab 2, the two ends of the plate surface steel bar 6 extend out of the two sides of the plate main body; the L-shaped hoop bar 72 is arranged in the butt joint part of the prefabricated floor slab 2, and the second steel bar 82 perpendicular to the gradient direction is arranged in the inner side of the L-shaped hoop bar 72.

[0074] The embodiments of the present application are not limited to this, according to the above content of the present application, according to the ordinary technical knowledge and common means in the art, other various forms of modifications, replacements or changes can be made without departing from the above basic technical idea of the present application, and all fall within the protection scope of the present application.

Claims

1. A precast floor low-slope roof structure, characterized by: It includes a frame beam and several prefabricated floors laid on the frame beam, the prefabricated floors are arranged in rows continuously along the slope direction of the slope roof, several rows of prefabricated floors are arranged at intervals along the direction perpendicular to the slope direction, the prefabricated floor includes a floor body, the front end and the tail end of the floor body extend downward into longitudinal sections and then outwardly bend to form butt joints, the butt joints of every two prefabricated floors in each row are relatively combined to form a filling area enclosed by the longitudinal sections and the butt joints, the prefabricated floor has a gap with the frame beam, and the two sides of each row of prefabricated floors have a gap communicated with the gap and the filling area, the gap, the gap and the filling area are filled with concrete, so that the prefabricated floors and the frame beam and every two prefabricated floors are fixedly connected through the concrete; the concrete in the gap, the gap and the filling area is micro-expansive concrete and is poured at one time, that is, the micro-expansive concrete is cast in situ on the frame beam to form a composite beam; the floor surface steel bars parallel to the slope direction are arranged in the floor body of the prefabricated floor, the two ends of the floor surface steel bars extend out of the two sides of the longitudinal section and enter the filling area, the floor surface steel bars of every two prefabricated floors in each row have a height difference and are connected through connecting steel bars; the butt joints of every two prefabricated floors in each row have a gap communicated with the filling area, the gap is filled with micro-expansive concrete, the first steel bars perpendicular to the slope direction are arranged in the filling area, and the first steel bars are respectively located at the top and the bottom of the filling area; the L-shaped stirrups are arranged in the butt joints of the prefabricated floor, the second steel bars perpendicular to the slope direction are arranged in the inner side of the L-shaped stirrups; the top surface of the frame beam has several bosses on one side or both sides, the bosses are arranged at intervals along the slope direction, the top surface of the boss is parallel to the slope direction, each prefabricated floor is arranged on the corresponding boss along the slope direction, the front end and the tail end of the prefabricated floor are respectively located between two adjacent bosses, and the gap is formed between the floor body of the prefabricated floor and the top surface of the boss.

2. The precast floor-deck low-slope roof structure according to claim 1, wherein: The beam surface steel bars and the beam bottom steel bars perpendicular to the slope direction are arranged in the butt joints of the prefabricated floor, the beam surface steel bars and the beam bottom steel bars extend into the concrete in the gap, when the frame beam is a double-sided frame beam, the two beam surface steel bars and the two beam bottom steel bars of every two rows of prefabricated floors have a height difference and are connected through connecting steel bars; when the frame beam is a single-sided frame beam, the beam surface steel bars and the beam bottom steel bars of the prefabricated floor are connected through connecting steel bars.

3. The precast floor-deck low-slope roof structure according to claim 2, wherein: The top of the composite beam is anchored into a plug, which is a closed stirrup formed by the intersection of two U-shaped stirrups, one of which is a first U-shaped stirrup located at the inner top end of the frame beam, and a plurality of third steel bars are bound to the inner side of the first U-shaped stirrup, and the other is a second U-shaped stirrup, the lower part of which is located in the frame beam and extends into the first U-shaped stirrup to connect it, and the upper part of which extends out of the frame beam into the concrete part, and a plurality of fourth steel bars are bound to the inner side of the second U-shaped stirrup, the beam top and bottom bars of the prefabricated floor extend into the closed part of the plug and are bound to the plug, and when the frame beam is a single-sided frame beam, the supporting steel bars are located in the closed part of the plug.

4. The precast floor-deck low-slope roof structure according to claim 2, wherein: A rubber pad is arranged between the bottom surface of the abutting part of the prefabricated floor and the frame beam to increase the gap and the contact area of the slightly expanded concrete between the prefabricated floor and the frame beam.

5. A method of constructing a precast floor-deck low-slope roof assembly as defined in claim 1, wherein The method comprises the following steps: S1, manufacturing the prefabricated floor in a factory; S2, pouring the main body frame of the slope roof structure on site; S3, transporting the prefabricated floor to the construction site and hoisting it onto the frame beam of the main body frame, so that the prefabricated floors are arranged in rows along the slope direction of the slope roof, the abutting parts of every two prefabricated floors in each row are relatively combined to form a filling area, there is a gap between the prefabricated floor and the frame beam, and a plurality of rows of prefabricated floors are arranged at intervals perpendicular to the slope direction, and each row of prefabricated floors has a gap on both sides, which is communicated with the gap and the filling area; S4, fixing the prefabricated floor on the frame beam; S5, pouring concrete into the gap, and at the same time, the concrete is filled into the gap and the filling area between the prefabricated floor and the frame beam, so that the prefabricated floors and the frame beam are fixedly connected through the concrete, and the slope roof is formed; S6, arranging a waterproof layer on the slope roof.

6. A prefabricated floor panel for use in the prefabricated floor and low-slope roof structure according to claim 1, characterized in that: It comprises a plate body, the front end and the tail end of the plate body are extended downward into longitudinal sections and then bent outward to form abutting parts.

7. The precast floor slab of claim 6, wherein: The abutting part of the prefabricated floor is provided with beam bottom bars and beam top bars perpendicular to the slope direction, the two ends of the beam bottom bars and the beam top bars extend out of the two sides of the prefabricated floor; the plate body is provided with plate surface steel bars parallel to the slope direction, the two ends of the plate surface steel bars extend out of the two sides of the plate body; the abutting part of the prefabricated floor is provided with L-shaped stirrups, the inner side of the L-shaped stirrups is provided with second steel bars perpendicular to the slope direction; a plurality of beam lifting ring assemblies are embedded in the prefabricated floor, the beam lifting ring assembly comprises a lifting ring, a lifting bar, a horizontal closed stirrup and a plurality of parallel arranged connecting bars, the connecting bars connect the beam top bars and the beam bottom bars, the horizontal closed stirrup embraces the connecting bars, the lifting bar is in the shape of an isosceles trapezoid without a bottom side, the lifting ring is composed of an arch-shaped section in the middle and a pair of horizontal sections, one end of each horizontal section is connected with one end of the arch-shaped section, and the other end extends horizontally, the lifting bar is connected with the connecting bars and the arch-shaped section of the lifting ring, the horizontal section of the lifting ring is connected with the connecting bars, and the arch-shaped section of the lifting ring is further connected with the beam top bars, and the upper part of the arch-shaped section extends out of the top surface of the prefabricated floor.

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