Precast floor slab composite beam connection structure and construction method for precast floor slab composite beam connection

Abstract

This application relates to the field of building technology, and in particular to a precast floor slab composite beam connection structure and a construction method for connecting precast floor slab composite beams. The precast floor slab composite beam connection structure includes a precast floor slab, a composite beam, and connecting reinforcing bars. The composite beam includes a precast main body and a cast-in-place main body connected to each other. The connecting side of the precast floor slab is fitted to the cast-in-place main body. The precast floor slab includes a floor slab main body, a connecting sleeve, and embedded reinforcing bars. Both the connecting sleeve and the embedded reinforcing bars extend in a third direction and are embedded within the floor slab main body. The connecting sleeve is exposed on its connecting side. A portion of the connecting reinforcing bars can extend into the connecting sleeve, while the other portion is embedded within the cast-in-place main body. According to the precast floor slab composite beam connection structure and construction method provided in this application, neither the precast floor slab nor the precast main body has exposed reinforcing bars, facilitating the transportation and hoisting of the precast floor slab and composite beam main body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building, in particular to a prefabricated floor slab composite beam connecting structure and a prefabricated floor slab composite beam connecting construction method. BACKGROUND

[0002] At present, there are two forms of prefabricated floor slabs: wet floor slabs and dry floor slabs.

[0003] The dry floor slab refers to the connection between the plates of the full assembly type floor slab by using mechanical connecting pieces. This connection method has high connection efficiency, but the connection between the plates has the phenomenon of discontinuous stiffness, which limits its development in high intensity areas.

[0004] The wet floor slab is divided into two cases according to the type of the plate. One is the assembly monolithic composite floor slab, which is a floor slab system composed of prefabricated plates and cast-in-place reinforced concrete layers. The outer extending steel bars are usually reserved at the ends of the floor slab plates, and the outer extending steel bars are bent and extended into the cast-in-place concrete layer. The other is the assembly floor slab without a composite layer, that is, the wet type connecting structure of the reserved outer extending steel bars and the post-cast concrete at the connection. Both cases of the wet floor slab need to set the reserved outer extending steel bars at the ends of the floor slab or at the connection, which makes the surface of the prefabricated materials (such as prefabricated floor slabs, prefabricated composite beams, etc.) have exposed steel bars, which is not convenient for the transportation of the prefabricated materials, and / or there are a large number of reserved outer extending steel bars in the building of the construction site, which greatly hinders the lifting of building materials. The exposed steel bars not only easily rust, but also cause great safety hazards to the personal safety of construction personnel. SUMMARY

[0005] The purpose of the present application is to provide a prefabricated floor slab composite beam connecting structure and a prefabricated floor slab composite beam connecting construction method, so as to solve the technical problems in the prior art that the surface of the prefabricated materials (such as prefabricated floor slabs, prefabricated composite beams, etc.) has exposed steel bars, which is not convenient for the transportation of the prefabricated materials, and / or there are a large number of reserved outer extending steel bars in the building of the construction site, which greatly hinders the lifting of building materials. The exposed steel bars not only easily rust, but also cause great safety hazards to the personal safety of construction personnel.

[0006] According to a first aspect of the present application, a prefabricated floor slab composite beam connecting structure is provided, comprising a prefabricated floor slab, a composite beam and connecting steel bars,

[0007] The composite beam extends in a first direction, and the composite beam comprises a prefabricated main body and a cast main body connected to each other in a second direction, and the first direction is perpendicular to the second direction;

[0008] The prefabricated floor slab is parallel to a plane determined by the first direction and the third direction, and a connecting side of the prefabricated floor slab in the third direction is arranged in abutment with the pouring body, the third direction being perpendicular to the first direction and the second direction respectively;

[0009] The prefabricated floor slab comprises a floor body, a connecting sleeve and a pre-embedded steel bar, the connecting sleeve and the pre-embedded steel bar both extend along the third direction, and both are embedded in the floor body, the connecting sleeve being exposed by the connecting side;

[0010] The connecting steel bar extends along the third direction, a part of the connecting steel bar being capable of extending into the connecting sleeve so as to connect the connecting steel bar with the pre-embedded steel bar via the connecting sleeve, and another part of the connecting steel bar being embedded in the pouring body;

[0011] The floor body and the pouring body are both ultra-high performance concrete.

[0012] Preferably, the connecting sleeve is an internally threaded sleeve, and an outer side of the part of the connecting steel bar extending into the connecting sleeve comprises external threads matched with the internally threaded sleeve;

[0013] The minimum length of the pre-embedded steel bar embedded in the floor body in the third direction is wherein f y2 is the yield strength of the pre-embedded steel bar, d0 is the nominal diameter of the pre-embedded steel bar, f t is the tensile strength of the floor body, c b is the thickness of the floor body.

[0014] Preferably, both the length of the pre-embedded steel bar in the third direction and the length of the connecting steel bar in the third direction are equal to l e .

[0015] The prefabricated floor slab further comprises a plurality of longitudinal steel bars and a plurality of transverse steel bars both embedded in the floor body, the longitudinal steel bars extending along the first direction, a plurality of the longitudinal steel bars being arranged at intervals along the third direction, and the transverse steel bars extending along the third direction, a plurality of the transverse steel bars being arranged at intervals along the first direction.

[0016] Preferably, the number of the connecting sleeves is n, wherein A U is the sectional area of the floor body per unit width; f y1 is the yield strength of the floor longitudinal steel bar; A s ’ is the area of the longitudinal steel bar per unit width of the sectional area of the floor body.

[0017] n number of the connecting sleeves are arranged at intervals along the first direction, and the number of the connecting rebars and the number of the embedded rebars are equal to the number of the connecting sleeves.

[0018] Preferably, in the first direction, the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve.

[0019] Preferably, the prefabricated body comprises a T-shaped steel, prefabricated concrete, and a steel cage, the prefabricated concrete comprises a bottom wall and two side walls, and the steel cage comprises a top, a bottom, and two sides;

[0020] The flange of the T-shaped steel and the bottom of the steel cage are embedded in the bottom wall, the two sides are arranged corresponding to the two side walls, and a part of the side close to the bottom is embedded in the corresponding side wall.

[0021] The top and the other part of the side are embedded in the cast body.

[0022] The prefabricated concrete is ultra-high performance concrete.

[0023] Preferably, the prefabricated body further comprises a connecting dowel group, the connecting dowel group comprises two dowels arranged on both sides of the web of the T-shaped steel in the third direction, the dowels extend in the third direction, the dowels are fixedly arranged at one end of the web of the T-shaped steel away from the flange, and the dowels are embedded in the cast body.

[0024] The bottom wall and the two side walls form a cavity, and the composite beam further comprises a filling part arranged in the cavity.

[0025] Preferably, the number of the prefabricated floor slabs is two, and the two prefabricated floor slabs are arranged on both sides of the composite beam in the third direction.

[0026] According to the second aspect of the present application, a prefabricated floor slab composite beam connecting construction method is provided, which comprises the prefabricated floor slab composite beam connecting structure of any one of the above technical solutions, so as to have all the beneficial technical effects of the prefabricated floor slab composite beam connecting structure, which will not be described here.

[0027] The steps include:

[0028] Determine the parameters of the prefabricated floor slab, determine the cross-sectional size of the prefabricated floor slab and the configuration parameters of the longitudinal rebar and the transverse rebar according to the design load and boundary conditions of the floor slab.

[0029] Confirm the number n of the connecting sleeves, according to Calculate the value of n, wherein, f tis the tensile strength of the floor body; A U is the cross-sectional area of the floor body per unit width; f y1 is the yield strength of the longitudinal steel bars of the floor; A s is the area of the longitudinal steel bars per unit width of the cross-section of the floor body; f y2 is the yield strength of the embedded steel bars; d0 is the nominal diameter of the embedded steel bars;

[0030] The rationality of the value of n is verified by uniformly distributing n connecting sleeves along the first direction on the floor body, and determining whether the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve. If the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve, the value of n is acceptable.

[0031] The minimum anchoring length of the embedded steel bars is determined wherein c b is the thickness of the floor body;

[0032] The prefabricated floor is poured, the embedded steel bars are cut according to the minimum anchoring length, the embedded steel bars after cutting are welded with the corresponding connecting sleeves, and the post-poured concrete is poured after the formwork is arranged according to the cross-sectional size of the prefabricated floor, the configuration parameters of the longitudinal steel bars and the transverse steel bars, and the uniform distribution position of the connecting sleeves.

[0033] The prefabricated body is made, the prefabricated body of the composite beam is prefabricated according to the building setting parameters, and a supporting connection structure is arranged on the prefabricated body.

[0034] The composite beam and the prefabricated floor are assembled, an angle steel is arranged on the supporting connection structure so that the supporting surface of the angle steel is at the same elevation as the bottom surface of the prefabricated floor, the prefabricated floor is hoisted on the supporting surface of the angle steel, the connecting steel bars are screwed into the corresponding connecting sleeves, and the pouring body is poured.

[0035] After the assembly is completed, the angle steel is removed after the pouring body is cured.

[0036] Preferably, in the step of verifying the rationality of the value of n, if the distance between two adjacent connecting sleeves is less than three times the diameter of the connecting sleeve, the nominal diameter d0 of the embedded steel bars is increased, the value of n is recalculated, and the distance between two adjacent connecting sleeves is less than three times the diameter of the connecting sleeve.

[0037] Compared with the prior art, the application has the following beneficial effects:

[0038] The prefabricated floor slab composite beam connecting structure provided by the application embeds a connecting sleeve and a pre-buried steel bar in a floor slab main body, and sets a connecting steel bar in a pouring main body of a composite beam, so that neither the prefabricated floor slab nor the prefabricated main body part of the composite beam has an exposed steel bar outside, effectively facilitating transportation and hoisting of the prefabricated floor slab and the prefabricated main body of the composite beam, and reducing the probability of scratches of construction personnel by exposed steel bars. When the prefabricated floor slab and the composite beam need to be connected, the pre-buried steel bar and the connecting steel bar can be connected through the connecting sleeve, so as to improve the rigidity continuity of the connection between the prefabricated floor slab and the composite beam.

[0039] In order to make the above objectives, characteristics and advantages of the application more apparent, clear and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0041] Figure 1 The cross-sectional structure schematic diagram of the prefabricated floor slab composite beam connecting structure provided by the embodiment of the application is obtained by cutting along a plane perpendicular to the first direction;

[0042] Figure 2 The cross-sectional structure schematic diagram of the prefabricated main body provided by the embodiment of the application is obtained by cutting along a plane perpendicular to the first direction;

[0043] Figure 3 The isometric structure schematic diagram of the prefabricated floor slab composite beam connecting structure provided by the embodiment of the application;

[0044] Figure 4 The isometric structure schematic diagram of the prefabricated floor slab provided by the embodiment of the application;

[0045] Figure 5 The flowchart of the prefabricated floor slab composite beam connecting construction method provided by the embodiment of the application.

[0046] Reference signs:

[0047] 111 - longitudinal reinforcement; 112 - transverse reinforcement; 120 - floor body; 131 - connecting sleeve; 132 - embedded reinforcement; 210 - connecting reinforcement; 220 - pouring body; 310 - T-shaped steel; 311 - flange; 312 - web; 320 - prefabricated concrete; 321 - bottom wall; 322 - side wall; 330 - reinforcement cage; 331 - top portion; 332 - side portion; 333 - bottom portion; 334 - extending reinforcement; 340 - filling portion; 350 - stud; 410 - support connecting structure; 420 - angle steel.

[0048] F1 - first direction; F2 - second direction; F3 - third direction. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0050] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0051] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0052] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] The following will be described with reference to the drawings Figures 1 to 5The application discloses a prefabricated floor composite beam connecting structure and a prefabricated floor composite beam connecting construction method.

[0055] Referring to Figures 1 to 4 As shown in the drawings, the embodiment of the first aspect of the application provides a prefabricated floor composite beam connecting structure, which comprises a prefabricated floor, a composite beam and connecting steel bars 210. The composite beam extends along a first direction F1. The composite beam comprises a prefabricated main body and a cast main body 220 which are connected to each other along a second direction F2. The first direction F1 is perpendicular to the second direction F2. The prefabricated floor is arranged parallel to a plane determined by the first direction F1 and a third direction F3. The connecting side of the prefabricated floor along the third direction F3 is arranged in abutment with the cast main body 220. The third direction F3 is perpendicular to the first direction F1 and the second direction F2 respectively. The prefabricated floor comprises a floor main body 120, a connecting sleeve 131 and embedded steel bars 132. The connecting sleeve 131 and the embedded steel bars 132 both extend along the third direction F3. The connecting sleeve 131 and the embedded steel bars 132 are both embedded in the floor main body 120. The connecting sleeve 131 is exposed by the connecting side. The connecting steel bars 210 extend along the third direction F3. A part of the connecting steel bars 210 can extend into the connecting sleeve 131, so that the connecting steel bars 210 and the embedded steel bars 132 are connected through the connecting sleeve 131. Another part of the connecting steel bars 210 is embedded in the cast main body 220. The prefabricated concrete, the floor main body and the cast main body are all ultra-high performance concrete.

[0056] The prefabricated floor composite beam connecting structure provided by the application embeds the connecting sleeve 131 and the embedded steel bars 132 in the floor main body 120 and arranges the connecting steel bars 210 in the cast main body 220 of the composite beam. This makes the steel bars of neither the prefabricated floor nor the prefabricated main body of the composite beam exposed to the outside, effectively facilitating the transportation and hoisting of the prefabricated floor and the prefabricated main body of the composite beam and reducing the probability of the construction personnel being scratched by the exposed steel bars. When the prefabricated floor and the composite beam need to be connected, the embedded steel bars 132 and the connecting steel bars 210 can be connected through the connecting sleeve 131, so as to improve the stiffness continuity of the connection between the prefabricated floor and the composite beam.

[0057] Referring to Figures 1 to 4 The direction shown by F1 in the drawings can be an example of the first direction F1. The direction shown by F2 in the drawings can be an example of the second direction F2. The direction shown by F3 in the drawings can be an example of the third direction F3.

[0058] Preferably, the connecting sleeve 131 is a female threaded sleeve, and the outer side of the portion of the connecting steel bar 210 extending into the connecting sleeve 131 comprises a male thread matched with the female threaded sleeve, so that the connecting steel bar 210 can be connected with the connecting sleeve 131 through thread matching, effectively improving the rigidity continuity of the embedded steel bar 132 and the connecting steel bar 210.

[0059] Optionally, the absolute value of the difference between the inner diameter of the connecting sleeve 131 and the diameter of the embedded steel bar 132 is less than 2 mm, so as to ensure that the diameters of the embedded steel bar 132 and the connecting steel bar 210 are close to each other, thereby further ensuring the rigidity continuity of the embedded steel bar 132 and the connecting steel bar 210.

[0060] Optionally, the distance from the outer edge of the connecting sleeve 131 to the edge of the floor body 120 on the corresponding side is not less than 20 mm, so as to ensure the protection of the floor body 120 on the connecting sleeve 131. Here, the distance from the outer edge of the connecting sleeve 131 to the edge of the floor body 120 on the corresponding side can be understood as the distance from the upper edge of the connecting sleeve 131 to the upper edge of the floor body 120 in the second direction F2, and can also be understood as the distance from the lower edge of the connecting sleeve 131 to the lower edge of the floor body 120 in the second direction F2, etc.

[0061] Preferably, the minimum length of the embedded steel bar 132 embedded into the floor body 120 in the third direction F3 is wherein f y2 is the yield strength of the embedded steel bar 132, d0 is the nominal diameter of the embedded steel bar 132, f t is the tensile strength of the floor body 120, c b is the thickness of the floor body (here, the thickness of the floor body can be understood as the thickness of the protective layer of the transverse steel bar and / or longitudinal steel bar). The minimum length of the embedded steel bar 132 embedded into the floor body 120 in the third direction F3 can be understood as the minimum anchoring length of the embedded steel bar 132, according to the formula:

[0062]

[0063] The minimum anchoring length of the embedded steel bar 132 calculated can effectively ensure the connecting rigidity of the composite beam and the prefabricated floor.

[0064] Preferably, the length of the embedded steel bar 132 in the third direction F3 and the length of the connecting steel bar 210 in the third direction F3 are both equal to l e , so as to balance the anchoring force on both sides of the connection between the composite beam and the prefabricated floor.

[0065] Preferably, as Figure 3 and Figure 4As shown, the precast floor slab can be a ribbed floor slab, that is, the precast floor slab includes a plurality of longitudinal steel bars 111 and a plurality of transverse steel bars 112 embedded in the floor slab body 120. The longitudinal steel bars 111 extend along the first direction F1, and the plurality of longitudinal steel bars 111 are spaced apart along the third direction F3. The transverse steel bars 112 extend along the third direction F3, and the plurality of transverse steel bars 112 are spaced apart along the first direction F1 to ensure the strength of the precast floor slab.

[0066] Optionally, the aforementioned floor slab body 120 may be cast from UHPC (Ultra-High Performance Concrete) to improve the performance of the aforementioned ribbed floor slab.

[0067] Preferably, such as Figure 3 and Figure 4 As shown, the number of the aforementioned connecting sleeves 131 is n (n is a positive integer). Among them, A U The cross-sectional area of ​​the floor slab body 120 per unit width; f y1 Refers to the yield strength of the longitudinal reinforcement in the floor slab (111); A s 'Refers to the area of ​​the longitudinal steel bars 111 in the cross section of the floor slab body 120 per unit width.'

[0068] Preferably, such as Figure 3 and Figure 4 As shown, n connecting sleeves 131 are spaced apart along the first direction F1. The number of both connecting steel bars 210 and embedded steel bars 132 is equal to the number of connecting sleeves 131, so that the connecting sleeves 131, connecting steel bars 210 and embedded steel bars 132 correspond one-to-one.

[0069] Preferably, in the first direction F1, the distance between two adjacent connecting sleeves 131 is greater than or equal to three times the diameter of the connecting sleeve 131, to ensure effective anchoring of the UHPC to the sleeve.

[0070] In an embodiment, preferably, such as Figures 1 to 3As shown, the prefabricated body can include a T-shaped steel 310, a prefabricated concrete 320 including a bottom wall 321 and two side walls 322, and a steel cage 330 including a top portion 331, a bottom portion 333, and two side portions 332. The flange 311 of the T-shaped steel 310 and the bottom portion 333 of the steel cage 330 are both embedded in the bottom wall 321, the two side portions 332 are arranged corresponding to the two side walls 322, and a part of the side portion 332 close to the bottom portion 333 is embedded in the corresponding side wall 322. The top portion 331 and the other part of the side portion 332 are embedded in the pouring body 220. In this way, by arranging the structure of the steel cage 330 and the structure of the T-shaped steel 310 arranged in the steel cage 330 upside down, the part of the steel reinforcement exposed outside the prefabricated concrete 320 of the prefabricated body of the composite beam is the part of the structure of the steel cage 330, which effectively avoids the phenomenon that the sharp end of the steel reinforcement directly protrudes outside the prefabricated concrete 320, not only facilitates the transportation of the prefabricated body, but also effectively avoids the probability of scratching the construction personnel by the sharp end of the steel reinforcement.

[0071] Optionally, as shown in Figure 2 The steel cage 330 can further include at least four extension steels 334 extending along the first direction F1. The top portion 331, the bottom portion 333, and the two side portions 332 of the steel cage 330 form a rectangular steel cage. The number of the rectangular steel cages can be multiple, and the multiple rectangular steel cages can be arranged at intervals along the first direction F1. The at least four extension steels 334 can be arranged at the four corners of the rectangular steel cage, respectively, and the extension steel 334 can be connected to each rectangular steel cage to form the steel cage 330 extending along the first direction F1.

[0072] Optionally, as shown in Figure 1 The prefabricated body can further include a support connecting structure 410, which can be an internally threaded sleeve extending along the third direction F3. The internally threaded sleeve can be welded to the steel cage 330. When pouring the pouring body 220, the support connecting structure 410 can be used to fix an angle steel 420 for supporting the prefabricated floor.

[0073] Optionally, the prefabricated concrete 320 can be made of UHPC (Ultra-High Performance Concrete) to ensure the performance of the prefabricated concrete 320.

[0074] Preferably, as shown in Figure 1 and Figure 2As shown, the prefabricated main body can further include a connecting stud set, which can include two studs 350 oppositely arranged on two sides of the web 312 of the T-shaped steel 310 along a third direction F3, the studs 350 extending along the third direction F3, the studs 350 fixedly arranged at one end of the web 312 of the T-shaped steel 310 away from the flange 311, and the studs 350 embedded in the pouring main body 220 to improve the shear connection strength of the web 312 and the pouring main body 220.

[0075] Preferably, the pouring main body 220 described above can be UHPC (i.e., Ultra-High Performance Concrete), so that the composite beam is inverted by the structure of the T-shaped steel 310 and the pouring main body 220, so that under the action of the bending load, the tension of the tensile region of the cross section of the composite beam is mainly borne by the UHPC in the tensile region, the part of the reinforcing cage 330 embedded in the UHPC, and the flange 311 of the T-shaped steel 310, and the compression of the compression region of the cross section of the composite beam is mainly borne by the UHPC in the compression region. The tensile strength of the flange 311 of the T-shaped steel 310 is several times the compressive strength of the UHPC, and according to the cross-section ultimate equilibrium theory, under the action of the bending load, it is beneficial to the full play of the compressive strength of the UHPC in the compression region.

[0076] Preferably, the bottom wall 321 and the two side walls 322 form a cavity to reduce the weight of the composite beam.

[0077] Preferably, as shown in Figure 1 The composite beam described above can further include a filling part 340, which can be arranged in the cavity to facilitate pouring of the pouring main body 220 and prevent un-solidified UHPC from flowing into the cavity during pouring of the pouring main body 220. Alternatively, the filling part 340 can be polyethylene foam plastic, rubber inflatable core mold, etc.

[0078] In an embodiment, as shown in Figure 1 and Figure 2 The number of the prefabricated floor slabs described above can be two, and the two prefabricated floor slabs are arranged on two sides of the composite beam in the third direction F3, and both of the two prefabricated floor slabs are aligned with the pouring main body 220 of the composite beam, so that the prefabricated main body and the two prefabricated floor slabs can form a pouring space to facilitate pouring of the pouring main body 220.

[0079] Alternatively, as shown in Figure 1 and Figure 2 In the second direction F2, the thickness of the prefabricated floor slab is equal to the thickness of the pouring main body 220.

[0080] The embodiments of the second aspect of the present application also provide a prefabricated floor composite beam connection construction method, which comprises the prefabricated floor composite beam connection structure of any of the above embodiments, so that the prefabricated floor composite beam connection structure has all the beneficial technical effects, which will not be repeated here.

[0081] Specifically, the prefabricated floor composite beam connection construction method comprises the following steps:

[0082] In step S01, the parameters of the prefabricated floor are determined according to the design load and boundary conditions of the floor to determine the cross-sectional size of the prefabricated floor, the configuration parameters of the longitudinal reinforcement 111 and the transverse reinforcement 112.

[0083] Optionally, the configuration parameters of the longitudinal reinforcement 111 can include the number of longitudinal reinforcement 111, the arrangement interval of longitudinal reinforcement 111, the position of longitudinal reinforcement 111 relative to the arrangement plane of the floor body 120, etc. The above configuration parameters of the longitudinal reinforcement 111 are the conventional parameters of the dense rib floor, and the selection of the configuration parameters of the longitudinal reinforcement 111 is the existing technology in the field, which will not be repeated here.

[0084] Optionally, the configuration parameters of the transverse reinforcement 112 can include the number of transverse reinforcement 112, the arrangement interval of transverse reinforcement 112, the position of transverse reinforcement 112 relative to the arrangement plane of the floor body 120, etc. The above configuration parameters of the transverse reinforcement 112 are the conventional parameters of the dense rib floor, and the selection of the configuration parameters of the transverse reinforcement 112 is the existing technology in the field, which will not be repeated here.

[0085] In step S02, the number n of the connection sleeve 131 is confirmed, and the value of n is calculated by formula (1) according to the tensile bearing capacity of the longitudinal reinforcement 111 and the material of the floor body 120 in the unit width dense rib floor and the diameter of the embedded reinforcement 132,

[0086]

[0087] Wherein, f t is the tensile strength of the floor body 120; A U is the cross-sectional area of the floor body 120 per unit width; f y1 is the yield strength of the floor longitudinal reinforcement 111; A s is the area of the longitudinal reinforcement 111 per unit width of the cross section of the floor body 120; f y2 is the yield strength of the embedded reinforcement 132; d0 is the nominal diameter of the embedded reinforcement 132.

[0088] In step S03, the rationality of the value of n is verified, and the n connection sleeves 131 are uniformly distributed along the first direction F1 on the floor body 120, and the distance (l套 ) whether it is greater than or equal to three times the diameter (d 套 ) of the connecting sleeve 131 (i.e., l 套 ≥ 3d 套 ) to ensure the effective anchoring of the UHPC to the sleeve.

[0089] Optionally, if the distance between two adjacent connecting sleeves 131 is greater than or equal to three times the diameter of the connecting sleeve 131, the value of n can be taken.

[0090] Optionally, if the distance between two adjacent connecting sleeves 131 is less than three times the diameter of the connecting sleeve 131, the nominal diameter d0 of the embedded steel bar 132 is increased, and the value of n is recalculated until the distance between two adjacent connecting sleeves 131 is less than three times the diameter of the connecting sleeve 131.

[0091] Step S04, determining the minimum anchoring length of the embedded steel bar 132, calculating the value of the minimum anchoring length l e according to formula (2):

[0092]

[0093] where c b is the thickness of the floor body.

[0094] Step S041, cutting the embedded steel bar 132 according to the minimum anchoring length, and welding the embedded steel bar 132 after cutting with the corresponding connecting sleeve 131.

[0095] Step S05, pouring the prefabricated floor slab, arranging the formwork and pouring concrete according to the cross-sectional size of the prefabricated floor slab, the configuration parameters of the longitudinal steel bar 111 and the transverse steel bar 112, and the uniform distribution position of the connecting sleeve 131, to realize the prefabricated pouring of the prefabricated floor slab.

[0096] Step S06, manufacturing the prefabricated body, prefabricating the prefabricated body of the composite beam according to the building setting parameters, and setting the support connecting structure 410 on the prefabricated body.

[0097] Optionally, the prefabricated floor slab composite beam connecting construction method can further include step S061 of setting the support connecting structure 410, and welding two internally threaded sleeves at symmetrical positions of the two side parts 332 of the steel reinforcement cage 330.

[0098] Optionally, the prefabricated floor slab composite beam connecting construction method can further include step S062 of pouring the prefabricated concrete 320, plugging the above-mentioned internally threaded sleeves, and pouring the prefabricated concrete 320 according to the shape of the above-mentioned prefabricated concrete 320.

[0099] Optionally, the prefabricated floor slab composite beam connecting construction method can further include step S063 of arranging a filler 340. After the prefabricated concrete 320 is solidified, the stopper in the internally-threaded sleeve is removed, and the filler is filled into the cavity.

[0100] Step S07: assembling the composite beam and the prefabricated floor slab. The angle steel 420 is arranged on the supporting connecting structure 410, so that the supporting surface of the angle steel 420 is at the same level as the bottom surface of the prefabricated floor slab. The prefabricated floor slab is hoisted on the supporting surface of the angle steel 420. The connecting steel bars 210 are screwed into the corresponding connecting sleeves 131. The pouring main body 220 is poured.

[0101] Step S08: completing the assembly. After the pouring main body 220 is cured and solidified, the angle steel 420 is removed.

[0102] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A precast floor slab composite beam connection structure, characterized by, The precast floor slab, the composite beam and the connecting steel bar, The composite beam extends along a first direction, and the composite beam comprises a precast body and a cast-in-place body connected to each other along a second direction, the first direction being perpendicular to the second direction; The precast floor slab is arranged in abutment with the cast-in-place body along a connecting side of the precast floor slab in a third direction, the third direction being perpendicular to the first direction and the second direction respectively; The precast floor slab comprises a floor body, a connecting sleeve and a pre-embedded steel bar, the connecting sleeve and the pre-embedded steel bar both extend along the third direction, and the connecting sleeve and the pre-embedded steel bar are both embedded in the floor body, the connecting sleeve being exposed by the connecting side; The connecting steel bar extends along the third direction, and a part of the connecting steel bar is capable of extending into the connecting sleeve so that the connecting steel bar is connected to the pre-embedded steel bar through the connecting sleeve, and another part of the connecting steel bar is embedded in the cast-in-place body; The floor body and the cast-in-place body are both ultra-high performance concrete; The connecting sleeve is an internally threaded sleeve, and an outer side of the part of the connecting steel bar extending into the connecting sleeve comprises an externally threaded sleeve matched with the internally threaded sleeve. A minimum length of the embedded steel bar embedded in the floor body in the third direction is wherein, f y2 a yield strength of the embedded steel bar, d 0 is a nominal diameter of the embedded steel bar, f t a tensile strength of the floor body, c b a thickness of the floor body.

2. The precast floor slab composite beam connecting structure according to claim 1, wherein The length of the pre-embedded steel bar in the third direction and the length of the connecting steel bar in the third direction are both equal to l e ; The precast floor slab further comprises a plurality of longitudinal steel bars and a plurality of transverse steel bars both embedded in the floor body, the longitudinal steel bars extend along the first direction, and a plurality of the longitudinal steel bars are arranged at intervals along the third direction, and the transverse steel bars extend along the third direction, and a plurality of the transverse steel bars are arranged at intervals along the first direction.

3. The precast floor slab composite beam connecting structure according to claim 2, wherein the number of the connecting sleeves is n, wherein, A U denotes the cross-sectional area of the floor body per unit width; f y1 denotes the yield strength of the longitudinal reinforcement of the floor; A s denotes the area of the longitudinal reinforcement of the cross-section of the floor body per unit width; n connecting sleeves are arranged at intervals along the first direction, and the number of the connecting steel bars and the pre-embedded steel bars is equal to the number of the connecting sleeves.

4. The precast floor slab composite beam connection structure according to claim 2, wherein, In the first direction, the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve.

5. The precast floor slab composite beam connection structure according to any one of claims 2 to 4, characterized in that, The precast body comprises a T-shaped steel, a precast concrete and a steel cage, the precast concrete comprises a bottom wall and two side walls, and the steel cage comprises a top, a bottom and two sides; The flange of the T-shaped steel and the bottom of the steel cage are both embedded in the bottom wall, the two sides are arranged in correspondence with the two side walls, and a part of the side close to the bottom is embedded in the corresponding side wall; The top and another part of the side are embedded in the cast-in-place body; The precast concrete is ultra-high performance concrete.

6. The precast floor slab composite beam connection structure according to claim 5, wherein, The precast body further comprises a connecting dowel group, the connecting dowel group comprises two dowels arranged at intervals along a third direction on two sides of the web of the T-shaped steel, the dowels extend along the third direction, the dowels are fixedly arranged at an end of the web of the T-shaped steel away from the flange, and the dowels are embedded in the cast-in-place body; The bottom wall and the two side walls form a cavity, and the composite beam further comprises a filling part arranged in the cavity.

7. The prefabricated floor slab composite beam connecting structure according to claim 5, characterized in that, the number of the prefabricated floor slabs is two, and the two prefabricated floor slabs are arranged on both sides of the composite beam in the third direction.

8. A method of connecting precast floor slab composite beams, characterized by, Construction of the prefabricated floor slab composite beam connecting structure according to any one of claims 2 to 7, the steps of which include: determining the parameters of the prefabricated floor slab, determining the cross-sectional size of the prefabricated floor slab and the configuration parameters of the longitudinal steel bars and the transverse steel bars according to the design load and boundary conditions of the floor slab; n is the number of said connecting sleeves, and n is calculated as follows: f t ft is the tensile strength of said floor body; A U A is the cross-sectional area of said floor body per unit width; f y1 fy is the yield strength of the longitudinal reinforcement of the floor; A s A is the area of said longitudinal reinforcement per unit width of the cross-section of said floor body; f y2 fy is the yield strength of said embedded reinforcement; d D is the nominal diameter of said embedded reinforcement; checking the reasonableness of the value of n, determining whether the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve, and if the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve, the value of n is acceptable; determining a minimum anchorage length of the embedded steel reinforcement wherein, c b is the thickness of the floor body; pouring the prefabricated floor slab, cutting the embedded steel bars according to the minimum anchoring length, welding the cut embedded steel bars with the corresponding connecting sleeves, and pouring concrete after formwork arrangement according to the cross-sectional size of the prefabricated floor slab, the configuration parameters of the longitudinal steel bars and the transverse steel bars, and the uniform distribution position of the connecting sleeves; manufacturing the prefabricated main body, prefabricating the prefabricated main body of the composite beam according to the building setting parameters, and setting the supporting connecting structure on the prefabricated main body; assembling the composite beam and the prefabricated floor slab, setting angle steel on the supporting connecting structure so that the supporting surface of the angle steel is at the same elevation as the bottom surface of the prefabricated floor slab, hoisting the prefabricated floor slab on the supporting surface of the angle steel, screwing the connecting steel bars into the corresponding connecting sleeves, and pouring the pouring main body; after the assembly is completed, the angle steel is removed after the pouring main body is cured.

9. The prefabricated floor slab composite beam connecting construction method according to claim 8, characterized in that, In the step of checking the reasonableness of the value of n, if the distance between two adjacent connecting sleeves is less than three times the diameter of the connecting sleeve, the nominal diameter of the embedded steel bar is increased d 0, the value of n is recalculated until the distance between two adjacent connecting sleeves is greater than or equal to three times the diameter of the connecting sleeve.

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