A roof deck construction

Abstract

This utility model provides a roof cantilever slab structure, relating to the field of civil engineering technology. It includes a roof wall with a cantilever slab connected to it. The cantilever slab consists of a first and a second cast-in-place section integrally cast with the roof wall. The first section is connected to the frame column roof wall. A steel reinforcement cage is cast within both the first and second sections. The steel reinforcement cage consists of main reinforcement bars, bottom reinforcement bars, stirrups, first auxiliary reinforcement bars, and second auxiliary reinforcement bars. The middle sections of the first and second auxiliary reinforcement bars are set as downwardly inclined bends, and these bends are staggered. In this utility model, the inclination angle of the auxiliary reinforcement bars intersects with the direction of the diagonal crack, utilizing the tensile strength of the reinforcement bars to directly bear the tensile force at the diagonal crack, thus preventing the slab from cracking due to excessive length.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, specifically to a roof slab structure. Background Technology

[0002] A cantilever slab is a specific architectural form or component formed using the cantilever principle. A roof cantilever slab refers to a large-area horizontal or slightly inclined slab structure that cantilevers out from the edge or part of the main roof of a building. It is usually independent of the roof maintenance system, and its main function is not to provide shelter from wind and rain, but to create a unique architectural form, a rich spatial experience, and to express technical aesthetics.

[0003] For example, the utility model patent with publication number CN221956926U discloses a construction joint structure for a cantilever beam with a shear-resistant steel reinforcement skeleton, which enhances the shear strength of the cantilever beam.

[0004] However, for some cantilever slabs with a large cantilever length, the straight steel reinforcement cage in the above technical solution relies entirely on the stirrups to bear the entire shear force, which has limited shear resistance. The large shear force at the root of the cantilever slab can easily cause diagonal cracks. Summary of the Invention

[0005] Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a roof slab structure that solves the problems mentioned in the background section.

[0006] Technical solution To achieve the above objectives, this utility model provides the following technical solution: A roof cantilever slab structure includes a roof wall, to which a cantilever slab is connected. The cantilever slab consists of a first cast-in-place section and a second cast-in-place section integrally cast with the roof wall. The first cast-in-place section is connected to the frame column roof wall. A steel reinforcement cage is cast within the first and second cast-in-place sections. The steel reinforcement cage consists of main steel bars, auxiliary steel bars, bottom steel bars, and stirrups. The middle part of the auxiliary steel bars is set as a downwardly inclined bend, and the inclination angle of the bend is opposite to the direction of the diagonal crack.

[0007] Preferably, the auxiliary reinforcement includes a plurality of first auxiliary reinforcements and second auxiliary reinforcements, wherein the bent sections of the first auxiliary reinforcements and second auxiliary reinforcements are staggered.

[0008] Preferably, the angle between the bent section and the horizontal plane is 45°.

[0009] Preferably, the stirrup is configured as an open frame shape, and both ends of the stirrup are integrally formed with an inner folded section. The bottom of the inner folded section at both ends is provided with a positioning bend. The two positioning bends form a positioning ring for placing the first auxiliary bar. The front end of the first auxiliary bar is inserted into and tied inside the positioning ring.

[0010] Preferably, the main reinforcing bars and bottom reinforcing bars are respectively tied to the four corners of the stirrups, the front section of the second auxiliary reinforcing bar is tied to the upper side of the stirrups, and the rear sections of the first auxiliary reinforcing bar and the rear sections of the second auxiliary reinforcing bar are trapped at the bottom of the stirrups. The main reinforcing bars, the front sections of the first auxiliary reinforcing bars and the front sections of the second auxiliary reinforcing bars are distributed in a triangular pattern. Beneficial effects

[0011] This utility model provides a roof cantilever structure. It has the following beneficial effects: In this invention, an auxiliary steel bar with an inclined arrangement in the middle section is added inside the traditional steel reinforcement cage. The inclination angle of the auxiliary steel bar intersects with the direction of the diagonal crack. The tensile strength of the steel bar is used to directly bear the tensile force at the diagonal crack. Compared with the straight steel reinforcement cage that only relies on concrete and stirrups, the shear strength is higher, and the excessive development of the diagonal crack is avoided.

[0012] In this invention, the first and second auxiliary reinforcing bars and the main reinforcing bars are tied and fixed to the stirrups in a triangular arrangement to form a three-dimensional stress-bearing skeleton, which is used to transmit and disperse shear force and avoid stress concentration that could cause cracking.

[0013] In this invention, the bent sections of the first and second auxiliary reinforcing bars are staggered, so that the inclined bent sections and the front sections of the first and second auxiliary reinforcing bars form a rhomboid frame structure, which works in conjunction with the stirrups to improve shear resistance. Attached Figure Description

[0014] Figure 1 This is a structural schematic diagram of a roof cantilever slab structure according to the present invention; Figure 2 This is a schematic diagram of the steel reinforcement cage in this utility model; Figure 3 This is a side view of the steel reinforcement cage in this utility model; Figure 4 This is a schematic diagram of the stirrup structure in this utility model.

[0015] In the diagram: 1. Roof wall; 2. Cantilever slab; 201. First pouring section; 202. Second pouring section; 3. Main reinforcement; 4. Auxiliary reinforcement; 401. First auxiliary reinforcement; 402. Second auxiliary reinforcement; 5. Bottom reinforcement; 6. Stirrups; 601. Inward bend; 602. Positioning bend. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0017] This utility model embodiment provides a roof slab structure, such as Figure 1-4 As shown, the structure includes a roof wall 1, to which a cantilevered slab 2 is connected. The cantilevered slab 2 consists of a first cast-in-place section 201 and a second cast-in-place section 202 integrally cast with the roof wall 1. The first cast-in-place section 201 is connected to the frame column roof wall 1. A steel reinforcement cage is cast within the first and second cast-in-place sections 201 and 202. The steel reinforcement cage consists of main steel bars 3, auxiliary steel bars 4, bottom steel bars 5, and stirrups 6. The stirrups 6 are designed as open frames. The main steel bars 3 and bottom steel bars 5 are respectively tied to the four corners of the stirrups 6. Inner folded sections 601 are integrally formed at both ends of the stirrups 6. Positioning bends 602 are provided at the bottom of the inner folded sections 601 at both ends. The two positioning bends 602 form a positioning ring for placing the first auxiliary steel bar 401. The front section of the first auxiliary steel bar 401... The first auxiliary reinforcement 402 is inserted and tied inside the positioning ring. The front section of the second auxiliary reinforcement 402 is tied and fixed to the upper side of the stirrup 6. The rear sections of the first auxiliary reinforcement 401 and the second auxiliary reinforcement 402 are trapped at the bottom of the stirrup 6. The main reinforcement 3, the front section of the first auxiliary reinforcement 401, and the front section of the second auxiliary reinforcement 402 are distributed in a triangular shape. Since the upper part of the cantilever slab 2 is under tension and the lower part is under compression, the tension in the upper part gradually decreases from top to bottom. The triangular structure can be used to transfer and disperse shear force, avoiding stress concentration and cracking. At the same time, the staggered arrangement of the reinforcement, the front section of the first auxiliary reinforcement 401, and the front section of the second auxiliary reinforcement 402 coordinates the distribution space and increases the spacing between the reinforcements. This can avoid the reinforcement being too concentrated due to the addition of multiple auxiliary reinforcements 4, improve the bond strength between concrete and reinforcement, and improve the overall structural bearing capacity, durability, and safety.

[0018] The auxiliary reinforcing bar 4 has a downward-sloping bent section 403 in the middle, with the bent section 403 forming an angle of 45° with the horizontal plane. The angle of inclination of the bent section 403 is opposite to the direction of the diagonal crack. The angle of inclination of the auxiliary reinforcing bar 4 intersects the direction of the diagonal crack, utilizing the tensile strength of the reinforcing bar to directly bear the tensile force at the diagonal crack. The auxiliary reinforcing bar 4 includes several first auxiliary bars 401 and second auxiliary bars 402. The bent sections 403 of the first auxiliary bars 401 and second auxiliary bars 402 are staggered, forming a rhomboid frame structure between the first auxiliary bars 401 and second auxiliary bars 402. The stirrups 6 work together to improve the shear resistance.

[0019] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A roof slab structure, comprising roof walls, characterized in that: The roof wall is connected to a cantilevered slab, which consists of a first casting section and a second casting section integrally cast with the roof wall. The first casting section is connected to the frame column roof wall. A steel reinforcement cage is cast in the first and second casting sections. The steel reinforcement cage consists of main steel bars, auxiliary steel bars, bottom bars and stirrups. The middle part of the auxiliary steel bars is set as a downward inclined bend, and the inclination angle of the bend is opposite to the direction of the diagonal crack.

2. The roof slab structure according to claim 1, characterized in that: The auxiliary reinforcement includes several first auxiliary bars and second auxiliary bars, with the bent sections of the first and second auxiliary bars being staggered.

3. The roof slab structure according to claim 2, characterized in that: The angle between the bent section and the horizontal plane is 45°.

4. A roof slab structure according to claim 3, characterized in that: The stirrup is configured as an open frame shape, and both ends of the stirrup are integrally formed with an inner folded section. The bottom of the inner folded section at both ends is provided with a positioning bend. The two positioning bends form a positioning ring for placing the first auxiliary bar. The front end of the first auxiliary bar is inserted into and tied inside the positioning ring.

5. A roof slab structure according to claim 4, characterized in that: The main reinforcing bars and bottom reinforcing bars are respectively tied to the four corners of the stirrups. The front section of the second auxiliary reinforcing bar is tied to the upper side of the stirrups. The rear sections of the first and second auxiliary reinforcing bars are trapped at the bottom of the stirrups. The main reinforcing bars, the front sections of the first and second auxiliary reinforcing bars are arranged in a triangular pattern.

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