Supporting-free and mold-free beam-slab integrated super-long concrete structure of floor system and construction method thereof

Abstract

The invention relates to a floor support-free and mold-free beam-slab integrated ultra-long concrete structure and a construction method thereof, an ultra-long building structure comprises a stand column, a precast beam and a beam-slab integrated unit, the bottom of the outer side wall of a rib beam of the beam-slab integrated unit is provided with a cantilever edge, and a casting groove extending in the front-back direction is formed between the two rib beams; prestressed tendons penetrating through the tendon passing holes are arranged in the casting grooves, embedded components are arranged at the positions, close to the tensioning ends and the anchoring ends of the prestressed tendons, of the ribbed beams, and concrete is poured after the Y-direction cap steel bars and the X-direction cap steel bars are arranged. The construction method comprises the steps that the stand columns, the precast beams and the beam-slab integrated units are sequentially arranged or hoisted, the prestressed tendons are arranged in the casting grooves formed by the adjacent beam-slab integrated units, then the Y-direction cap steel bars and the X-direction cap steel bars are arranged, then concrete is cast in place, and tensioning and fixing of the prestressed tendons are completed. According to the invention, the implementation of post-tensioning prestress on site is realized, and the feasibility of the prefabricated super-long concrete structure is ensured.

Description

Technical Field

[0001] The invention relates to a beam-slab integrated super-long concrete structure without support or formwork for a floor slab and a construction method thereof. Background Art

[0002] Currently, the most common super-long concrete structures basically adopt the cast-in-place reinforced concrete process rather than the prefabricated assembly process. The main reason is to consider the impact of temperature stress on the building structure.

[0003] Specifically, current prefabricated buildings all use modular components; when setting up temperature prestressed steel bars, they can only be designed in sections, which results in the overall tension of the prestressed steel bars between the modules not being transmitted continuously during on-site construction. In other words, with the current construction technology, temperature prestressed steel bars that ensure that the extra-long concrete structure does not crack must be placed on the construction site. At present, there is no relevant technology to solve the problem of how to effectively structure temperature prestressed steel bars and prefabricated components to ensure the reliable transmission of the overall tension of the prestressed steel bars. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-long concrete structure with integrated beams and slabs and a construction method thereof, which can realize the support-free and formwork-free construction of assembled ultra-long concrete structures, solve the problem that temperature prestressed steel bars cannot be combined with prefabricated assembled buildings, and shorten the construction period of ultra-long concrete structures.

[0005] The present invention is realized by the following technical scheme: a beam-slab integrated super-long concrete structure without support and formwork for the floor slab, comprising

[0006] The columns 1 are reinforced concrete structures and are arranged in an array. The left and / or right sides of the top of any column 1 are provided with a steel corbel 11 for beams, the front and / or rear sides of the top of any column 1 are provided with a first steel corbel 12, and the top surface of the column 1 is provided with a column reinforcement 13 extending upwards;

[0007] The precast beam 2 is a reinforced concrete structure, extending in the left-right direction and arranged between two adjacent columns 1, and the beam steel corbel 11 of the column 1 supports the precast beam 2; the top of the precast beam 2 is provided with a beam groove 21 extending in the left-right direction, and the front and rear sides of the beam groove 21 are provided with stirrup bending parts 22 extending from the top surface of the precast beam 2 and bending toward each other; the front and rear ends of the precast beam 2 are provided with beam extension steel bars 23 extending from the end surface of the precast beam 2, and the front and rear end surfaces of the precast beam 2 are both provided with key grooves 24; a second steel corbel 25 is also provided on the front and / or rear side surfaces of the precast beam 2, and a rib hole 26 is also provided in the area of ​​the side wall of the precast beam 2 corresponding to the upper part of each second steel corbel 25;

[0008] The beam-slab integrated unit 3 is a reinforced concrete structure, which is divided into a flat plate 31 and rib beams 32 arranged on the left and right sides of the flat plate 31 and extending downward; a truss steel bar 311 is arranged on the surface of the flat plate 31, and a notch 33 extending forward and backward is arranged on the top of the outer side of the rib beam 32, and the steel bars in the rib beam 32 extend to the notch 33 to form a closed hoop 34;

[0009] The beam-slab integrated unit 3 is located between two adjacent precast beams 2, and the rib beam 32 is placed on the first steel corbel 12 and the second steel corbel 25; the front and rear ends of the rib beam 32 mounted on the first steel corbel 12 are provided with rib beam extension steel bars 35 extending from the end surface of the rib beam 32;

[0010] A cantilever 36 extending forward and backward is provided at the bottom of the outer side wall of the rib beam 32, so that a casting groove 37 extending forward and backward is formed between two rib beams 32 supporting the same first steel corbel 12 or the same second steel corbel 25;

[0011] A plurality of casting grooves 37 arranged in sequence in the front-to-back direction together form a prestressed tensioning section;

[0012] An embedded component 5 is also provided at the front end of the outer wall of the rib beam 32 of the beam-slab integrated unit 3 located at the front end of the prestressed tensioning section and at the rear end of the outer wall of the rib beam 32 of the beam-slab integrated unit 3 located at the rear end of the prestressed tensioning section. The embedded component 5 includes a steel plate 51 and a plurality of rib plates 52 arranged vertically on the inner and outer sides of the steel plate 51; the inner rib plate 52 of the steel plate is embedded in the rib beam 32;

[0013] A prestressed tendon 41 is also provided in the casting groove 37; the prestressed tendon 41 intersecting the precast beam 2 passes through the casting groove 37 from the tendon hole 26 of the precast beam 2 at the front end of the building structure, alternately passes through the tendon holes 26 and the casting groove 37 in the same extension direction, and then passes out from the tendon hole 26 of the precast beam 2 at the rear end of the building structure; an anchor end is provided at one end of the prestressed tendon 41 and a tensioning end is provided at the other end of the prestressed tendon 41;

[0014] Place a full-length Y-direction cap steel bar 6 at the casting groove 37, and place a full-length X-direction cap steel bar 7 on the precast beam;

[0015] Cast-in-place concrete 8 is poured on the beam-slab integrated unit 3, the precast beam 2, the surface of the column 1, the casting groove 37 and the corresponding nodes; after the cast-in-place concrete 8 reaches the design strength, the tensioning end of the prestressed tendon 41 is tensioned, and after the tensioning is completed, the tensioning end of the prestressed tendon 41 is fixed to the main structure through the end assembly of the prestressed tendon 41.

[0016] The construction method of the beam-slab integrated super-long concrete structure without support and formwork for the floor slab comprises the following steps:

[0017] S1, arranging the columns 1 in an array;

[0018] S2, hoisting the precast beam 2 between two adjacent columns 1, wherein both ends of the precast beam 2 are supported on the beam steel brackets 11 of the columns 1, and the beam extension steel bars 23 of the precast beam 2 extend to above the columns 1;

[0019] S3, hoisting the beam-slab integrated unit 3, so that the rib beam of the beam-slab integrated unit 3 is supported on the second steel corbel 25 and the first steel corbel 12, wherein the front and rear ends of the rib beam 32 mounted on the first steel corbel 12 are provided with rib beam extension steel bars 35 extending from the end surface of the rib beam 32;

[0020] S4, placing a prestressed tendon 41 in the casting groove 37 formed between two adjacent beam-slab integrated units 3, wherein the prestressed tendon 41 intersecting the precast beam 2 passes through the casting groove 37 from the tendon hole 26 of the precast beam 2 at the front end of the prestressed tensioning section, alternately passes through the tendon holes 26 and the casting groove 37 in the same extension direction, and then passes out from the tendon hole 26 of the precast beam 2 at the rear end of the prestressed tensioning section; an anchor end is set at one end of the prestressed tendon 41 and a tensioning end is set at the other end of the prestressed tendon 41;

[0021] S5, hoisting the full-length X-direction cap steel bar 7 above the precast beam 2, and placing the full-length Y-direction cap steel bar 6 in the casting groove 37;

[0022] S6, cast-in-place concrete 8 is poured on the beam-slab integrated unit 3, the precast beam 2, the surface of the column 1, the casting groove 37 and the corresponding nodes; after the cast-in-place concrete 8 reaches the design strength, the tensioning end of the prestressed tendon 41 is tensioned, and after the tensioning is completed, the tensioning end of the prestressed tendon 41 is fixed to the main structure through the end assembly of the prestressed tendon 41.

[0023] Compared with the previous technology, the beneficial effects of the present invention are:

[0024] 1. Compared with the traditional beam-slab integrated building structure, by setting a cantilever at the rib beam, a casting groove is formed between two adjacent beam-slab integrated units. The casting groove cooperates with the reinforcement hole to make it possible to place prestressed tendons on site; the prestressed tendons are prestressed by post-tensioning the prestressed tendons (i.e., tensioning the prestressed tendons after pouring concrete).

[0025] 2. By arranging embedded components 5 on the outer wall of the rib beam 32, and the embedded components are respectively close to the anchor end and the tensioning end of the prestressed tendon 41, it is ensured that the connection surface between the cast-in-place concrete and the precast concrete will not be dislocated, thereby ensuring the implementation of post-tensioning prestressing on site and the feasibility of prefabricated and assembled ultra-long concrete structures.

[0026] 3. It retains all the advantages of the integrated beam-slab building structure, with low transportation costs, easy installation, and the characteristics of no support and formwork required during construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the column;

[0028] Figure 2 This is a structural diagram of a precast beam;

[0029] Figure 3 It is the structural schematic diagram of the beam-slab integrated unit;

[0030] Figure 4 It is a structural schematic diagram of the embedded components;

[0031] Figure 5 It is the structural diagram of prestressed tendons;

[0032] Figure 6 is a schematic diagram of step 1;

[0033] Figure 7 is a schematic diagram of step 2;

[0034] Figure 8 is a schematic diagram of step 3;

[0035] Fig. 9 is a schematic diagram of step 4;

[0036] Fig.10 is a schematic diagram of step 5;

[0037] Fig.11 is a schematic diagram of step 6;

[0038] Fig.12 This is an enlarged view of the end of the rib beam in the beam-slab integrated unit;

[0039] Fig.13 Schematic diagram of forming a casting groove and placing prestressed tendons for splicing two beam-slab integrated units;

[0040] Fig.14 For Fig.13 Schematic diagram of placing Y-direction cap reinforcement on the foundation;

[0041] Fig.15 For Fig.14 The state diagram of the Y-direction cap reinforcement is completed on the basis;

[0042] Fig.16 For Fig.15 The foundation is completed with cast-in-place concrete.

[0043] Explanation of numbers: 1-column, 11-steel corbel for beam, 12-first steel corbel, 13-column reinforcement, 2-precast beam, 21-beam groove, 22-stirrup bending part, 23-beam extension reinforcement, 24-keyway, 25-second steel corbel, 26-reinforcement hole, 3-beam-slab integrated unit, 31-flat plate, 311-truss reinforcement, 32-rib beam, 33-notch, 34-closed hoop, 35-rib beam extension reinforcement, 36-cantilever, 37-casting groove, 41-prestressed reinforcement, 42-sealing plate, 43-spiral reinforcement, 5-embedded component, 51-steel plate, 52-rib plate, 6-Y-direction cap reinforcement, 61-Y-direction full-length reinforcement, 62-first closed tension reinforcement, 7-X-direction cap reinforcement, 8-cast-in-place concrete. DETAILED DESCRIPTION

[0044] The present invention is described in detail below in conjunction with the accompanying drawings:

[0045] like Figure 1-5 Shown: The floor slab is an integrated super-long concrete structure with no support, including

[0046] The columns 1 are reinforced concrete structures and are arranged in an array. The left and / or right sides of the top of any column 1 are provided with a steel corbel 11 for beams, the front and / or rear sides of the top of any column 1 are provided with a first steel corbel 12, and the top surface of the column 1 is provided with a column reinforcement 13 extending upwards;

[0047] The beam steel corbel 11 is mainly used to support the precast beam 2, the first steel corbel 12 is used to support the beam-slab integrated unit 3, and the arrangement of the column reinforcement 13 ensures the reliability of the post-concrete connection at the beam-column node.

[0048] The precast beam 2 is a reinforced concrete structure, extending in the left-right direction and arranged between two adjacent columns 1, and the beam steel corbel 11 of the column 1 supports the precast beam 2; the top of the precast beam 2 is provided with a beam groove 21 extending in the left-right direction, and the front and rear sides of the beam groove 21 are provided with stirrup bending parts 22 extending from the top surface of the precast beam 2 and bending toward each other; the front and rear ends of the precast beam 2 are provided with beam extension steel bars 23 extending from the end surface of the precast beam 2, and the front and rear end surfaces of the precast beam 2 are both provided with key grooves 24; a second steel corbel 25 is also provided on the front and / or rear side surfaces of the precast beam 2, and a rib hole 26 is also provided in the area of ​​the side wall of the precast beam 2 corresponding to the upper part of each second steel corbel 25;

[0049] The second steel corbel 25 is used to support the beam-slab integrated unit 3, and the beam groove 21, the stirrup bending portion 22, the keyway 24, and the beam extension steel bar 23 are all for improving the connection strength with the post-cast concrete.

[0050] The beam-slab integrated unit 3 is a reinforced concrete structure, which is divided into a flat plate 31 and rib beams 32 arranged on the left and right sides of the flat plate 31 and extending downward; a truss steel bar 311 is arranged on the surface of the flat plate 31, and a notch 33 extending forward and backward is arranged on the top of the outer side of the rib beam 32, and the steel bars in the rib beam 32 extend to the notch 33 to form a closed hoop 34;

[0051] The beam-slab integrated unit 3 is located between two adjacent precast beams 2, and the rib beam 32 is placed on the first steel corbel 12 and the second steel corbel 25; the front and rear ends of the rib beam 32 mounted on the first steel corbel 12 are provided with rib beam extension steel bars 35 extending from the end surface of the rib beam 32;

[0052] The above beam-slab integrated unit has basically the same overall structure as the beam-slab integrated unit disclosed earlier by the applicant, with the difference being that a cantilever 36 extending forward and backward is provided at the bottom of the outer wall of the rib beam 32, so that a casting groove 37 extending forward and backward is formed between the two rib beams 32 that are jointly supported on the same first steel corbel 12 or the same second steel corbel 25; the casting groove 37 formed here cooperates with the rib hole 26 for placing prestressed tendons.

[0053] A plurality of casting grooves 37 arranged in sequence in the front-to-back direction together form a prestressed tensioning section;

[0054] An embedded component 5 is also provided at the front end of the outer wall of the rib beam 32 of the beam-slab integrated unit 3 located at the front end of the prestressed tensioning section and at the rear end of the outer wall of the rib beam 32 of the beam-slab integrated unit 3 located at the rear end of the prestressed tensioning section. The embedded component 5 includes a steel plate 51 and a plurality of rib plates 52 arranged vertically on the inner and outer sides of the steel plate 51; the inner rib plate 52 of the steel plate is embedded in the rib beam 32;

[0055] A prestressed tendon 41 is also provided in the casting groove 37; the prestressed tendon 41 intersecting the precast beam 2 passes through the casting groove 37 from the tendon hole 26 of the precast beam 2 at the front end of the prestressed tensioning section, alternately passes through the tendon holes 26 and the casting groove 37 in the same extension direction, and then passes out from the tendon hole 26 of the precast beam 2 at the rear end of the prestressed tensioning section; one end of the prestressed tendon 41 is fixed to the precast beam 2 to form an anchor end, and the other end of the prestressed tendon 41 forms a tensioning end;

[0056] It should be noted that the embedded components 5 are essentially arranged in the areas close to the anchoring end and the tensioning end of the prestressed tendons 41, and their main function is to ensure that the connection surface between the cast-in-place concrete and the precast concrete will not be dislocated.

[0057] Place a full-length Y-direction cap steel bar 6 at the casting groove 37, and place a full-length X-direction cap steel bar 7 on the precast beam;

[0058] Cast-in-place concrete 8 is poured on the beam-slab integrated unit 3, the precast beam 2, the surface of the column 1, the casting groove 37 and the corresponding nodes; after the cast-in-place concrete 8 reaches the design strength, the tensioning end of the prestressed tendon 41 is tensioned, and after the tensioning is completed, the tensioning end of the prestressed tendon 41 is fixed to the main structure through the end assembly of the prestressed tendon 41.

[0059] The Y-direction cap steel bar 6 includes a Y-direction full-length steel bar 61 and a first closed tie bar 62. Multiple Y-direction full-length steel bars 61 are located in the same plane and a plurality of first closed tie bars 62 are sequentially arranged in the extension direction of the Y-direction full-length steel bars 61. The X-direction cap steel bar 7 includes an X-direction full-length steel bar and a second closed tie bar. Multiple X-direction full-length steel bars are located in the same plane and a plurality of second closed tie bars are sequentially arranged in the extension direction of the X-direction full-length steel bars.

[0060] The end assembly includes a sealing plate 42 located at the end of the prestressed tendon 41 and a spiral tendon 43 located inside the sealing plate 42. The structure and use method of the sealing plate 42 and the spiral tendon 43 are prior art, and can refer to the application of traditional cast-in-place building structures.

[0061] like Figure 6-16 As shown: A construction method for a super-long concrete structure with integrated beam and slab without support for floor slab, characterized in that it comprises the following steps:

[0062] S1, arrange the columns 1 in an array (such as Figure 6 shown);

[0063] S2, hoist the precast beam 2 between two adjacent columns 1, wherein both ends of the precast beam 2 are supported on the beam steel brackets 11 of the column 1, and the beam extension steel bars 23 of the precast beam 2 extend to the top of the column 1 (such as Figure 7 shown);

[0064] S3, hoist the beam-slab integrated unit 3, so that the rib beam of the beam-slab integrated unit 3 is supported on the second steel corbel 25 and the first steel corbel 12, wherein the front and rear ends of the rib beam 32 mounted on the first steel corbel 12 are provided with rib beam extension steel bars 35 (such as Figure 8 , 12 shown);

[0065] S4, placing a prestressed tendon 41 in the casting groove 37 formed between two adjacent beam-slab integrated units 3, wherein the prestressed tendon 41 intersecting the precast beam 2 passes through the tendon hole 26 of the precast beam 2 at the front end of the prestressed tensioning section into the casting groove 37, alternately passes through the tendon holes 26 and the casting groove 37 in the same extension direction, and then passes out from the tendon hole 26 of the precast beam 2 at the rear end of the prestressed tensioning section; an anchor end is set at one end of the prestressed tendon 41 and a tensioning end is set at the other end of the prestressed tendon 41 (such as Fig. 9 , 13 shown);

[0066] S5, hoist the full-length X-direction cap steel bar 7 above the precast beam 2, and place the full-length Y-direction cap steel bar 6 (such as Fig.10 , 14 , as shown in 15);

[0067] S6, cast in-situ concrete 8 is poured on the beam-slab integrated unit 3, the precast beam 2, the surface of the column 1, the casting groove 37 and the corresponding nodes; after the cast-in-situ concrete 8 reaches the design strength, the tensioning end of the prestressed tendon 41 is tensioned, and after the tensioning is completed, the tensioning end of the prestressed tendon 41 is fixed to the main structure through the end assembly of the prestressed tendon 41 (such as Fig.11 , 16 shown).

[0068] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. The floor slab is a super-long concrete structure with beams and slabs that is free of support and formwork, and is characterized by: include The columns (1) are reinforced concrete structures and are arranged in an array. A steel corbel (11) for a beam is provided on the left or / and right side of the top of any column (1). A first steel corbel (12) is provided on the front or / and rear side of the top of any column (1). A column reinforcement (13) extending upward is provided on the top surface of the column (1). The precast beam (2) is a reinforced concrete structure, extending in the left-right direction and arranged between two adjacent columns (1), and the beam steel bracket (11) of the column (1) supports the precast beam (2); the top of the precast beam (2) is provided with a beam groove (21) extending in the left-right direction, and the front and rear sides of the beam groove (21) are provided with stirrup bending parts (22) extending from the top surface of the precast beam (2) and bending towards each other; the front and rear ends of the precast beam (2) are provided with beam extension steel bars (23) extending from the end surface of the precast beam (2), and the front and rear end surfaces of the precast beam (2) are both provided with keyways (24); a second steel bracket (25) is also provided on the front or / and rear side surface of the precast beam (2), and a rib hole (26) is also provided in the area of ​​the side wall of the precast beam (2) corresponding to the upper part of each second steel bracket (25); The beam-slab integrated unit (3) is a reinforced concrete structure, and is divided into a flat plate (31) and rib beams (32) arranged on the left and right sides of the flat plate (31) and extending downward; a truss steel bar (311) is arranged on the surface of the flat plate (31), a notch (33) extending forward and backward is arranged on the top of the outer side of the rib beam (32), and the steel bars in the rib beam (32) extend to the notch (33) to form a closed hoop (34); The beam-slab integrated unit (3) is located between two prefabricated beams (2) adjacent to each other, and the rib beam (32) is placed on the first steel corbel (12) and the second steel corbel (25); the front and rear ends of the rib beam (32) mounted on the first steel corbel (12) are provided with rib beam extension steel bars (35) extending from the end surface of the rib beam (32); A cantilever edge (36) extending forward and backward is provided at the bottom of the outer side wall of the rib beam (32), so that a casting groove (37) extending forward and backward is formed between two rib beams (32) supporting the same first steel corbel (12) or the same second steel corbel (25); A plurality of casting grooves (37) arranged in sequence and connected in the front-to-back direction together form a prestressed tensioning section; An embedded component (5) is also provided at the front end of the outer wall of the rib beam (32) of the beam-slab integrated unit (3) located at the front end of the prestressed tensioning section and at the rear end of the outer wall of the rib beam (32) of the beam-slab integrated unit (3) located at the rear end of the prestressed tensioning section. The embedded component (5) includes a steel plate (51) and a plurality of rib plates (52) which are arranged vertically on the inner and outer sides of the steel plate (51); the inner rib plate (52) of the steel plate is embedded in the rib beam (32); A prestressed tendon (41) is also provided in the casting groove (37); the prestressed tendon (41) intersecting the precast beam (2) passes through the tendon hole (26) of the precast beam (2) at the front end of the prestressed tensioning section into the casting groove (37), alternately passes through the tendon holes (26) and the casting groove (37) in the same extension direction, and then passes out from the tendon hole (26) of the precast beam (2) at the rear end of the prestressed tensioning section; an anchoring end is provided at one end of the prestressed tendon (41) and a tensioning end is provided at the other end of the prestressed tendon (41); A Y-direction cap steel bar (6) is placed at the casting groove (37) and a X-direction cap steel bar (7) is placed on the precast beam. Cast-in-place concrete (8) is poured on the beam-slab integrated unit (3), the precast beam (2), the surface of the column (1), the casting groove (37) and the corresponding nodes; after the cast-in-place concrete (8) reaches the designed strength, the tensioning end of the prestressed tendon (41) is tensioned, and after the tensioning is completed, the tensioning end of the prestressed tendon (41) is fixed to the main structure through the end assembly of the prestressed tendon (41).

2. The super-long concrete structure of beam-slab integration without support and formwork for floor slab according to claim 1 is characterized in that: The Y-direction cap steel bar (6) comprises a Y-direction full-length steel bar (61) and a first closed tie bar (62), wherein a plurality of the Y-direction full-length steel bars (61) are located in the same plane and a plurality of the first closed tie bars (62) are sequentially arranged in the extension direction of the Y-direction full-length steel bars (61); the X-direction cap steel bar (7) comprises an X-direction full-length steel bar and a second closed tie bar, wherein a plurality of the X-direction full-length steel bars are located in the same plane and a plurality of the second closed tie bars are sequentially arranged in the extension direction of the X-direction full-length steel bars.

3. The super-long concrete structure of beam-slab integration without support and formwork for floor slab according to claim 1 is characterized in that: The end assembly comprises a sealing plate (42) located at the end of the prestressed tendon (41) and a spiral tendon (43) located inside the sealing plate (42).

4. A construction method for an ultra-long concrete structure with integrated beam and slab without support for floor slab, characterized in that: The steps include: S1, arranging the columns (1) in an array; S2, hoisting the precast beam (2) between two adjacent columns (1), wherein both ends of the precast beam (2) are supported on the beam steel brackets (11) of the columns (1), and the beam extension steel bars (23) of the precast beam (2) extend above the columns (1); S3, hoisting the beam-slab integrated unit (3), so that the rib beam of the beam-slab integrated unit (3) is supported on the second steel corbel (25) and the first steel corbel (12), wherein the front and rear ends of the rib beam (32) mounted on the first steel corbel (12) are provided with rib beam extension steel bars (35) extending from the end surface of the rib beam (32); S4, placing a prestressed tendon (41) in a casting groove (37) formed between two adjacent beam-slab integrated units (3), wherein the prestressed tendon (41) intersecting the precast beam (2) passes through the casting groove (37) from the tendon hole (26) of the precast beam (2) at the front end of the prestressed tensioning section, alternately passes through the tendon holes (26) and the casting groove (37) in the same extension direction, and then passes out from the tendon hole (26) of the precast beam (2) at the rear end of the prestressed tensioning section; an anchoring end is set at one end of the prestressed tendon (41) and a tensioning end is set at the other end of the prestressed tendon (41); S5, hoisting a full-length X-direction cap steel bar (7) above the precast beam (2), and placing a full-length Y-direction cap steel bar (6) in the casting groove (37); S6, cast-in-place concrete (8) is poured on the beam-slab integrated unit (3), the precast beam (2), the surface of the column (1), the casting groove (37) and the corresponding nodes; after the cast-in-place concrete (8) reaches the design strength, the tensioning end of the prestressed tendon (41) is tensioned, and after the tensioning is completed, the tensioning end of the prestressed tendon (41) is fixed to the main structure through the end assembly of the prestressed tendon (41).

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