1. The utility model provides a no terraced roof beam is run more and is hung stair of choosing concrete, includes bench board, landing slab and girder, its characterized in that, the bench board includes first bench and second bench, the landing slab includes first platform and second platform, first bench, first platform, second bench and second platform connect gradually, form a run stair unit more, the second platform is connected to on the girder, all pre-buried reinforcing steel ribs that have in bench board, landing slab and the girder, each reinforcing steel rib is connected and is formed the steel rib skeleton.

2. The sill-free multi-track concrete cantilever stairway of claim 1, wherein the first bench, the first platform, the second bench and the second platform are integrally cast.

3. The ladder-beam-free multi-race concrete cantilever stair is characterized in that the reinforcing steel ribs pre-embedded in the ladder section plates are first square steel tubes arranged on one side close to a ladder well.

4. The ladder-beam-free multi-race concrete cantilever stair of claim 1, characterized in that the reinforcing steel ribs pre-embedded in the first platform are second square steel tubes perpendicular to the cantilever direction.

5. The terraced beam-free multi-track concrete cantilever stairway of claim 1, wherein the first platform is a variable cross-section slab.

6. The ladder-beam-free multi-track concrete cantilever stair of claim 1, wherein a first reinforcing area is formed on one side of the first platform close to the stair section plates, and the first reinforcing area is provided with hidden beam type reinforcing bars.

7. The ladder-beam-free multi-track concrete cantilever stair of claim 1, wherein the reinforcing steel ribs pre-embedded in the second platform comprise a third steel tube parallel to the cantilever direction and a fourth steel tube perpendicular to the cantilever direction.

8. The terraced beam-free multi-track concrete cantilever stairway of claim 1, wherein the second platform is a slab of constant cross-section.

9. The ladder-beam-free multi-track concrete cantilever stair of claim 1, wherein a second reinforcing area is provided on a side of the second platform close to the stair section plates, and the second reinforcing area is provided with hidden beam type reinforcing bars.

10. The ladder-beam-free multi-track concrete cantilever stair is characterized in that reinforcing steel ribs pre-embedded in the main beam are fifth steel pipes perpendicular to the cantilever direction, and two sides of the fifth steel pipes penetrate through the main beam and penetrate into concrete columns on two sides to be anchored.

Background

In the existing building, the stairs are generally made in a frame-lapping mode of arranging ladder posts and ladder beams. In some large-space buildings, the ladder columns and ladder beams generally affect the aesthetic feeling of the buildings. Therefore, the overhanging stair model without the ladder posts and the ladder beams is often applied to simple large-space buildings. The common overhanging stairs are steel structure or concrete overhanging stairs; in some buildings, the appearance of the stairs is often required to have the effect of integral fair-faced concrete, and the concrete cantilever stairs are adopted under the condition. Compare in the steel construction stair of encorbelmenting, the concrete stair of encorbelmenting is from great, and is higher to the support requirement, and present common concrete ladder of encorbelmenting generally has following several characteristics: the platform plate which is usually only overhung for two runs and is close to the support is provided with a ladder beam near the ladder section plate, and floors are arranged on two sides of the main beam at the support. The concrete cantilever stair with the characteristics can form a better triangular stable system, if no stair beam exists, a plastic hinge is easily formed at the junction of the platform plate and the stair section plate, a stable triangular system cannot be formed, and if the cantilever exceeds two runs, the spatial stress characteristic needs to be analyzed; if there is no floor on one side of the main beam of the support, the torsion effect of the main beam of the support is too large. In concise big space building, need usually to hang the concrete stair of encorbelmenting for many runs, the landing slab can't set up the ladder roof beam, support girder opposite side does not have the floor to link to each other under these unfavorable circumstances at the concrete stair of encorbelmenting under, present stair structure is difficult to adapt to above-mentioned requirement.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a multi-running concrete cantilever stair without a stair beam, which can effectively enhance the anti-shear-torsion capacity.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a no terraced roof beam is more run concrete and is hung stair, includes bench board, landing slab and girder, the bench board includes first bench and second bench, the landing slab includes first platform and second platform, first bench, first platform, second bench and second platform connect gradually, form a many and run stair unit, the second platform is connected to on the girder, equal pre-buried enhancement reinforcing steel bars that have in bench board, landing slab and the girder, each enhancement reinforcing steel bar is connected and is formed the steel skeleton.

Further, the first bench, the first platform, the second bench and the second platform are integrally cast into a whole.

Furthermore, the pre-buried reinforcing bar in the bench slab is the first square steel pipe that sets up in being close to shaft one side.

Furthermore, the reinforcing steel ribs pre-embedded in the first platform are second square steel pipes perpendicular to the overhanging direction.

Further, the first platform is a variable cross-section thick plate.

Further, one side, close to the bench slab, of the first platform is a first reinforcing area, and the first reinforcing area is provided with hidden beam type reinforcing bars.

Furthermore, the pre-buried reinforcing steel skeleton in the second platform includes the third party steel pipe that is on a parallel with the direction of encorbelmenting and the fourth party steel pipe that is perpendicular to the direction of encorbelmenting.

Further, the second platform is a thick plate with a uniform section.

Furthermore, one side, close to the stair section plate, of the second platform is a second reinforcing area, and the second reinforcing area is provided with hidden beam type reinforcing bars.

Furthermore, the reinforcing steel ribs pre-embedded in the main beam are fifth square steel tubes perpendicular to the overhanging direction, and two sides of each fifth square steel tube penetrate through the main beam and penetrate into the concrete columns on two sides for anchoring.

Compared with the prior art, the invention can construct a stable concrete cantilever stair under the unfavorable conditions of multiple runs, no stair beam, no plate constraint on the other side of the main beam of the support and the like, and has the following beneficial effects:

1. reinforcing steel ribs are embedded in the bench boards, the platform boards and the main beams, and the shear-torsion effect at each position can be well resisted.

2. According to the invention, the square steel pipe is arranged on one side of the bench board close to the shaft, so that the shearing and twisting action on the bench board can be well resisted.

3. The platform plate is provided with the reinforcing area, and the square steel pipes and the hidden beam type reinforcing bars are arranged, so that the large shearing and twisting effect of the crossed stair section plates when the crossed stair section plates are intersected with the platform plate can be well resisted.

4. The square steel pipe is arranged in the main beam and anchored in the column, so that the shearing and twisting action on the main beam can be well resisted.

5. The square steel pipes in the concrete members can be welded into a whole, so that the integrity of the overhanging stair can be enhanced.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

FIG. 2 is a schematic top view of the structure of the present invention;

FIG. 3 is a detail view of a portion of the first platen reinforcement area of the present invention;

FIG. 4 is a detail view of a second platen reinforcement area of the present invention in partial configuration;

in the figure: 1. the steel pipe reinforcing structure comprises a first bench plate, a second bench plate, a first platform plate, a second platform plate, a main beam, a first platform plate reinforcing area, a second platform plate reinforcing area, a first square steel pipe, a second square steel pipe, a third square steel pipe, a fourth square steel pipe, a fifth square steel pipe, a concrete column and a shaft, wherein the first bench plate is 2, the first platform plate is 3, the second platform plate is 4, the main beam is 5, the first platform plate reinforcing area is 6, the second platform plate reinforcing area is 7, the first square steel pipe is 8, the second square steel pipe is 9, the third square steel pipe is 10, the fourth square steel pipe is 11, the fifth square steel pipe is 12, the concrete column is 13, and the shaft is 14.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The invention provides a multi-running concrete cantilever stair without a stair beam, which is designed by taking the shear resistance of a platform plate at the junction of the stair sections, the anti-torsion resistance of the inner side area of the stair section close to a stair well and the anti-torsion resistance of a main beam of a support as guidance ideas, and as shown in figure 1, the invention comprises a stair section plate, a platform plate and a main beam 5, wherein the stair section plate comprises a first stair section 1 and a second stair section 2 which are concrete stair section plates, the platform plate comprises a first platform 3 and a second platform 4, the first stair section 1, the first platform 3, the second stair section 2 and the second platform 4 are sequentially connected to form a multi-running stair unit, and in which a first flight 1 and a second flight 2 are located between a first platform 3 and a second platform 4, the second platform 4 being connected to a main beam 5, the rest part is cantilevered, reinforcing steel ribs are pre-embedded in the bench plate, the platform plate and the main beam 5, and the reinforcing steel ribs are connected to form a steel rib framework. The stair has no ladder posts or ladder beams, particularly, one side of the second flat bedplate, which is close to the ladder section, has no ladder beam and only uses the main beam 5 on one side as a support, the other side of the main beam 5 has no floor slab for connection, and the ladder effectively resists the shear and torsion action through the design of the reinforcing steel ribs. The design method solves the problem that when the conventional favorable characteristics do not exist in the concrete cantilever stair, namely the concrete cantilever stair is designed under the unfavorable conditions that the running is more, the platform plate cannot be provided with the stair beam, and the other side of the support main beam is connected without a floor slab.

In this embodiment, the first bench 1, the first platform 3, the second bench 2 and the second platform 4 are integrally cast, and are conveniently connected with the main beam 5. A plurality of multi-running stair units are arranged in sequence, namely a multi-floor overhanging stair is formed, as shown in figure 1.

The reinforcing steel ribs pre-embedded in the bench boards are first square steel pipes 8 arranged on one side close to the shaft 14. As shown in fig. 2, the first and second steps 1 and 2 are each provided with the first square steel pipe 8.

The reinforcing steel ribs pre-embedded in the first platform 3 are second square steel tubes 9 perpendicular to the overhanging direction. The first platform 3 is a variable cross-section thick plate, and the thickness of the first bench plate 1 and the second bench plate 2 is larger.

In a preferred embodiment, the first platform 3 is a first reinforcing area 6 on the side close to the bench slab, the first reinforcing area 6 is provided with a hidden beam type reinforcement, and a stirrup and a longitudinal bar are needed to be arranged, as shown in fig. 3, the second square steel tube 9 is arranged on the side close to the first bench slab 1 and the second bench slab 2 of the first reinforcing area 6.

The reinforcing steel ribs pre-embedded in the second platform 4 comprise a third steel pipe 10 parallel to the overhanging direction and a fourth steel pipe 11 perpendicular to the overhanging direction, and the third steel pipe 10 is aligned with the first steel pipe 8 in the ladder section plate in the middle line in the plane of the top view, as shown in fig. 2. The second platform 4 is a thick plate with a uniform section.

In a preferred embodiment, the second platform 4 is a second reinforcing area 7 on the side close to the bench slab, the second reinforcing area 7 is provided with a hidden beam type reinforcement, and a stirrup and a longitudinal bar are needed to be provided, as shown in fig. 4, the fourth steel pipe 11 is provided on the side close to the first bench slab 1 and the second bench slab 2 of the second reinforcing area 7.

The reinforcing steel ribs pre-embedded in the main beam 5 are fifth square steel tubes 12 perpendicular to the overhanging direction, and two sides of the fifth square steel tubes 12 penetrate through the main beam and go deep into concrete column anchors 13 on two sides, so that the shearing and twisting action on the main beam can be well resisted.

The steel pipes can be welded mutually to form a whole, and the stability of the whole stair is improved.