CN221219424U - Prefabricated prestressing force beam type stair - Google Patents

Abstract

The utility model discloses a prefabricated prestressed girder type stair which comprises a plurality of stair inclined girders and stepping boards, wherein the number of the stepping boards is two, the two stair inclined girders are connected through the stepping boards, and hollow grooves are formed in the bottoms of the stepping boards. According to the utility model, the design of the beam type stair sloping plate is canceled, the load is directly transmitted to the stair sloping beam through the tread plate, the unique connection mode, independent template manufacture and the application of a prestress technology are adopted, the production efficiency is greatly improved, the dead weight of the structure is reduced, the independent tread plate manufacture can be flexibly adapted to the design scheme of stairs with different spans, the template production enables the surface of the structure to be smooth and smooth, the later processing difficulty is reduced, the tread plate is connected with the design of the reinforcing steel bar and the groove, the integrity and the safety of the stairs are improved, the L-shaped design is adopted for the sloping beam, the cross-section area of the beam can be effectively reduced, the dead weight of a member is reduced, and the clearance height of a use space is increased.

Description

Prefabricated prestressing force beam type stair

Technical Field

The utility model relates to the technical field of stairs, in particular to a prefabricated prestressed girder type stair.

Background

The assembled building has the advantages of short construction period, good quality, environmental protection, energy conservation and manpower and material resource conservation. Meanwhile, due to the obvious circular economy characteristic of the assembled building, the templates can be recycled, a large number of scaffolds and template operations can be saved, and wood resources are greatly saved. In addition, the popularization and the use of the assembled building are also helpful for relieving noise pollution, and because the components are produced in factories, the wet operation on site is less. Besides the advantages, the assembled building can greatly improve the production efficiency, reduce the labor cost and reduce the potential safety hazard. The application of the prestress technology can effectively avoid the premature occurrence of structural cracks of concrete, fully utilize high-strength steel bars and high-strength concrete materials, improve the material utilization rate and further reduce the dead weight of the structure.

The assembled stairway is an important component of the assembled building, and the assembled stairway is mainly a plate type stairway at present. In a large-span space structure, the thickness of a bottom plate of the plate-type stair needs to be increased to meet the safety requirement, so that the dead weight of the structure is greatly increased, the problems of heavy dead weight, difficult hoisting, easy cracking and the like of the traditional precast Liang Louti can occur, and the precast prestressed girder-type stair is provided for solving the problems.

Disclosure of utility model

The utility model aims at overcoming the defects of the prior art and provides a prefabricated prestressed girder type stair so as to solve the problems of the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a prefabricated prestressing force roof beam formula stair, includes stair sloping and flitch, the flitch is equipped with a plurality of, the stair sloping is equipped with two, links to each other through the flitch between two stair sloping, the bottom of flitch is equipped with the hollow tank, the both ends of hollow tank all are equipped with the end plate, one side of end plate is equipped with the recess, the lower extreme of flitch is the plane, the upper end of flitch is the inclined plane.

As a preferable technical scheme of the utility model, the stair oblique beam is L-shaped, and the top of the stair oblique beam is connected with a hanging ring.

As a preferable technical scheme of the utility model, stirrups are arranged in the stair inclined beam, non-prestressed ribs are arranged at three corners of the top of the stair inclined beam, and prestressed ribs are arranged at two corners of the bottom of the stair inclined beam.

As a preferable technical scheme of the utility model, the tread plate is L-shaped, a plurality of longitudinal ribs and transverse ribs are arranged in the tread plate, and the longitudinal ribs and the transverse ribs are prestressed ribs.

As a preferable technical scheme of the utility model, the depth of the groove is 20mm, and the tread plate is formed by pouring concrete, longitudinal ribs and transverse ribs in a prefabricated template.

As a preferable technical scheme of the utility model, transverse ribs at two ends of the tread plate are reserved with 50-70mm, and the stair inclined beam is formed by casting concrete, non-prestressed ribs, stirrups, prestressed ribs and transverse ribs in a precast inclined beam template.

The beneficial effects of the utility model are as follows: according to the utility model, the design of a beam type stair sloping plate is canceled, loads are directly transmitted to the stair sloping through the tread plates, the unique connection mode, independent template manufacture and the application of a prestress technology are adopted, the production efficiency is greatly improved, the dead weight of the structure is reduced, the independent tread plates can be flexibly adapted to the design scheme of stairs with different spans, the template production enables the surface of the structure to be smooth and smooth, the later processing difficulty is reduced, the tread plates are connected with the steel bars and the grooves, the integrity and the safety of the stairs are improved, the L-shaped design is adopted for the sloping plate, the cross-section area of the beam can be effectively reduced, the dead weight of the component is lightened, the clearance height of the using space is increased, and the problems of heavy weight, difficult hoisting and easiness in cracking of the traditional precast beam component are solved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the structure of the tread plate of the present utility model;

FIG. 3 is a schematic view of the structure of the stair stringer of the present utility model;

Fig. 4 is a schematic view of the connection structure of the tread board and the stair sloping according to the present utility model.

In the figure: stair sloping 1, tread 2, lifting ring 3, hollow groove 201, end plate 202, groove 203, plane 204, inclined plane 205, longitudinal bar 206, transverse bar 207, distributing bar 208, non-prestressed bar 101, stirrup 102, prestressed bar 103.

Detailed Description

The preferred embodiments of the present utility model will be described in detail below with reference to the attached drawings so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making clear and defining the scope of the present utility model.

Examples: referring to fig. 1-4, the present utility model provides a technical solution: the utility model provides a prefabricated prestressing force roof beam formula stair, includes stair sloping 1 and tread board 2, and tread board 2 is equipped with a plurality of, and stair sloping 1 is equipped with two, links to each other through tread board 2 between two stair sloping 1, and the bottom of tread board 2 is equipped with hollow groove 201, and the both ends of hollow groove 201 all are equipped with end plate 202, and one side of end plate 202 is equipped with recess 203, and the lower extreme of tread board 2 is plane 204, and the upper end of tread board 2 is inclined plane 205.

The stair sloping 1 is L-shaped, and the top of the stair sloping 1 is connected with a hanging ring 3.

The inside of stair sloping 1 is equipped with stirrup 102, and the top three corner of stair sloping 1 all is equipped with non-prestressing tendons 101, and the bottom two corners of stair sloping 1 all is equipped with prestressing tendons 103.

The tread plate 2 is L-shaped, a plurality of longitudinal ribs 206 and transverse ribs 207 are arranged in the tread plate 2, and the longitudinal ribs 206 and the transverse ribs 207 are prestress ribs.

The depth of the groove 203 is 20mm, and the tread plate 2 is formed by casting concrete, longitudinal ribs 206 and transverse ribs 207 in a prefabricated template.

The transverse ribs 207 at the two ends of the tread plate 2 are reserved with 50-70mm, and the stair inclined beam 1 is formed by casting concrete, non-prestressed ribs 101, stirrups 102, prestressed ribs 103 and transverse ribs 207 in a prefabricated inclined beam template.

Working principle: a prefabricated prestressed beam type stair is provided, a beam type stair sloping plate is omitted, load is directly transmitted to a stair sloping beam through a tread plate, the tread plate is produced in batch in a factory by adopting an independent template, the tread plate 2 is integrally L-shaped, the lower end of the tread plate is flat, the upper end of the tread plate is inclined, and concrete plugs are poured at the two ends of the tread plate. Connecting steel bars and grooves 203 with the length of 20mm are reserved on the left side and the right side of the tread plate 2, the connecting steel bars are poured into the stair inclined beams when being combined with the stair inclined beams, the structural integrity is improved, and the grooves 203 form shear keys by utilizing the fluidity of concrete; the step plate 2 and the stair oblique beam 1 are mainly stressed steel bars which adopt prestress bars. The pretensioning method is adopted to stretch prestressed tendons on a long-line pedestal, a plurality of treadboards and inclined beams with different spans can be stretched simultaneously, the treadboards are placed on the inclined beam templates through the treadboard shaping frames, the treadboards are connected with steel bars and are poured together on the L-shaped inclined beams, after the concrete is initially set, the inclined beam templates and the shaping frames can be dismantled, the concrete reaches the design strength, the prestressed tendons are placed, the prefabricated prestressed beam type stair production is completed, the stair inclined beam 1 adopts an L shape, the clearance height is increased while the dead weight of the structure is reduced, and the treadboards adopt independently designed stepping templates which can be produced in batch;

The combining process of the tread plate 2 and the stair sloping 1 comprises the following steps: the step plates which are orderly arranged are fixed through the shaping frame and are placed on the inclined beam templates of the stairs, the connection of the step plates and the connecting steel bars is realized through the reserved connecting steel bars and the grooves of the step plates, after the concrete is initially set, the shaping frame is removed, after the concrete strength reaches the design requirement, the prestressed steel bars are placed, and the inclined beam templates are removed, so that the stair manufacturing is completed.

The L-shaped stair oblique beam 1 is produced in a factory through a long line pedestal, and a reinforcing steel bar pore canal is reserved in a template, so that the pretensioning of the prestressed tendons is facilitated. When concrete is poured, firstly pouring bottom concrete, placing a tread through a tread shaping frame, removing the outer side fixing plate of the tread after the placement is finished, and finally pouring upper concrete, and after the concrete reaches the design strength, releasing the prestressed tendons to finish the manufacture of the prefabricated prestressed stairs.

The special connection mode, independent template manufacture and application of the prestress technology are adopted, so that the production efficiency is greatly improved, and the dead weight of the structure is reduced. The manufacturing of the independent tread can flexibly adapt to the design schemes of the stairways with different spans. The template production ensures that the surface of the structure is flat and smooth, and reduces the later processing difficulty. The design of the connecting steel bars and the grooves of the tread plates improves the integrity and the safety of the stairs. The oblique beam adopts L-shaped design, can effectually reduce beam cross-section area, lighten the component dead weight, increase the headroom height of usage space.

Taking a 3 m-wide 1 m-high stair as an example, the traditional beam type stair meets the structural requirement, the dead weight of the structure needs 3.18t, the beam type stair only needs 2.073t, and the effective weight is reduced by 34.8%. The utility model has the advantages of light dead weight, low cost, flexible production, strong construction adaptability and the like.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.

Claims (6)

1. The utility model provides a prefabricated prestressing force roof beam formula stair, includes stair sloping (1) and tread (2), its characterized in that: the stair tread plate (2) is provided with a plurality of, the stair tread plate (2) is provided with two, the stair tread plate (2) is connected between the two stair tread plates (1), the bottom of the stair tread plate (2) is provided with a hollow groove (201), two ends of the hollow groove (201) are respectively provided with an end plate (202), one side of each end plate (202) is provided with a groove (203), the lower end of each stair tread plate (2) is a plane (204), and the upper end of each stair tread plate (2) is an inclined plane (205).

2. A prefabricated prestressed girder type stairway according to claim 1, wherein: the stair sloping (1) is L-shaped, and the top of the stair sloping (1) is connected with a hanging ring (3).

3. A prefabricated prestressed girder type stairway according to claim 1, wherein: the novel stair oblique beam is characterized in that stirrups (102) are arranged in the stair oblique beam (1), non-prestressed tendons (101) are arranged at three corners of the top of the stair oblique beam (1), and prestressed tendons (103) are arranged at two corners of the bottom of the stair oblique beam (1).

4. A prefabricated prestressed girder type stairway according to claim 1, wherein: the pedal (2) is L-shaped, a plurality of longitudinal ribs (206) and transverse ribs (207) are arranged in the pedal (2), and the longitudinal ribs (206) and the transverse ribs (207) are prestressed ribs.

5. A prefabricated prestressed girder type stairway according to claim 1, wherein: the depth of the groove (203) is 20mm, and the tread (2) is formed by casting concrete, longitudinal ribs (206) and transverse ribs (207) in a prefabricated template.

6. A prefabricated prestressed girder type stairway according to claim 1, wherein: transverse ribs (207) at two ends of the tread plate (2) are reserved with 50-70mm, and the stair inclined beam (1) is formed by casting concrete, non-prestressed ribs (101), stirrups (102), prestressed ribs (103) and transverse ribs (207) in a prefabricated inclined beam template.