CN219992930U - Prestress assembly type hollow stair - Google Patents

Abstract

The utility model discloses a prestress assembled hollow stair, which comprises a stair bottom plate and a plurality of hollow pedals, wherein the stair bottom plate is provided with the plurality of hollow pedals, a cavity is formed in the hollow pedals, a pedal reinforcing mesh is arranged in the hollow pedals, prestress ribs are arranged in the stair bottom plate, and hanging ribs are arranged at the upper end part of the stair bottom plate; compared with common assembled stairs with the same specification, the self weight can reduce the amplitude by more than 40 percent; by adopting a collinear production mode, tens of stairs can be produced on a long-line pedestal at the same time by stretching the prestressed tendons once, and the production efficiency is obviously improved; the hollow tread plate die and the stair bottom plate die are less in manufacturing material consumption and low in cost; the stair bottom plate die has high adaptation degree, and can meet the stair manufacturing requirements of different spans; the prestress technology is adopted, so that the bearing capacity and rigidity of the stairs are improved, and the using amount of common reinforcing steel bars is reduced; the stair manufacturing consumable reduces, and the mould cost of manufacture reduces, makes stair when guaranteeing structural performance, synthesizes cost of manufacture and reduces.

Description

Prestress assembly type hollow stair

Technical Field

The utility model relates to the field of stairs, in particular to a prestress assembly type hollow stair.

Background

Along with the development of building industrialization, the assembled stair gradually replaces the cast-in-place stair with the advantages of good durability, convenient installation and the like. However, the conventional assembly type stairway at present has the problems of large self weight, high mold manufacturing cost, low stairway production efficiency and the like.

The dead weight of a common single-running-plate stair is usually 2t-4t, the dead weight of a scissor ladder is usually more than 4t, so that the difficulty of transportation and hoisting is increased, a crane with larger tonnage is often required for hoisting, and the construction cost is increased; the existing common stair production mould is provided with a vertical mould and a horizontal mould, the mould adopts stair one-time pouring molding, and has larger rigidity requirement on the mould, so that the steel consumption for manufacturing the mould is large, and the production cost is high; the adjustability of the stair mold is poor, a single-section mold can only produce stairs with single specification, the service period is long, and the production efficiency of the stairs is low.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art and provides a prestress assembly type hollow 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 hollow stair of prestressing force assembled, includes stair bottom plate and a plurality of hollow flier, be equipped with a plurality of hollow flier on the stair bottom plate, the inside of hollow flier is equipped with the cavity, the inside of hollow flier is equipped with flier reinforcing bar net, the inside of stair bottom plate is equipped with prestressing tendons, the upper end of stair bottom plate is equipped with the hanging bar.

As a preferable technical scheme of the utility model, the hollow tread plate is sunk onto the stair bottom plate, and the sinking depth is 3-5mm.

As a preferable technical scheme of the utility model, the hollow tread is made of end mould, bottom mould and top mould by using concrete and tread reinforcing mesh.

As a preferable technical scheme of the utility model, the stair bottom plate is made of concrete, prestressed tendons and hanging tendons by adopting a stair bottom plate side die and a stair bottom plate end die.

As a preferable technical scheme of the utility model, a plurality of hollow tread plates are arranged on the stair bottom plate through tread fixing frames.

As a preferable technical scheme of the utility model, the hollow tread plate is fastened with the tread fixing frame through a screw.

The beneficial effects of the utility model are as follows:

(1) Compared with common assembled stairs with the same specification, the self weight can reduce the amplitude by more than 40%.

(2) By adopting a collinear production mode, tens of stairs can be produced on a long-line pedestal at the same time by stretching the prestressed tendons once, and the production efficiency is obviously improved.

(3) The hollow tread plate die and the stair bottom plate die are less in manufacturing material consumption and low in cost; the stair bottom plate die has high adaptation degree, and can meet the stair manufacture with different span requirements.

(4) The prestress technology is adopted, so that the bearing capacity and rigidity of the stairs are improved, and the using amount of common reinforcing steel bars is reduced; under the limit value of deflection required by the specification, the thickness of the assembled stair tread plate can be reduced by 20mm-50mm compared with that of a common assembled stair tread plate with the same specification, thereby reducing the dead weight of the stair.

(5) The stair manufacturing consumable reduces, and the mould cost of manufacture reduces, makes stair when guaranteeing structural performance, synthesizes cost of manufacture and reduces.

Drawings

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

FIG. 2 is a cross-sectional view of the connection of the hollow tread and the stair tread of the present utility model;

FIG. 3 is a top view of the hollow tread manufacturing mold of the present utility model;

FIG. 4 is a perspective view of a mold for manufacturing a hollow tread of the present utility model;

FIG. 5 is a partial block diagram of a hollow tread of the present utility model;

FIG. 6 is a cross-sectional view of the hollow tread of the present utility model;

FIG. 7 is a top view of the stair tread manufacturing mold of the present utility model;

fig. 8 is a perspective view of the stair tread fixing frame of the present utility model.

In the figure: the tread comprises a hollow tread plate 1, a stair bottom plate 2, an end mould 101, a bottom mould 102, a top mould 103, a tread plate reinforcing mesh 104, a tread fixing frame 105, a screw 106, a cavity 107, a stair bottom plate side mould 201, a stair bottom plate end mould 202, a prestressed rib 203 and a hanging rib 204.

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. 1-8, the present utility model provides a technical solution: the utility model provides a hollow stair of prestressing force assembled, includes stair bottom plate 2 and a plurality of hollow tread 1, is equipped with a plurality of hollow tread 1 on the stair bottom plate 2, and the inside of hollow tread 1 is equipped with cavity 107, and the inside of hollow tread 1 is equipped with tread bar net 104, and the inside of stair bottom plate 2 is equipped with prestressing tendons 203, and the one end of stair bottom plate 2 is connected with hanging bar 204.

The hollow tread plate 1 is sunk onto the stair base plate 2 with a sinking depth of 3-5mm.

The hollow tread 1 is made of concrete and tread reinforcing mesh 104 by using an end mold 101, a bottom mold 102 and a top mold 103.

The stair tread 2 is made of concrete and prestressed tendons 203 and hanging tendons 204 by adopting a stair tread side die 201 and a stair tread end die 202.

A plurality of hollow tread plates 1 are mounted on the stair base plate 2 by tread fixing frames 105.

The hollow tread plate 1 is fastened to the tread fixing frame 105 by a screw 106.

Working principle: the prestress assembled hollow stair adopts a mode of separate and independent production of steps and a stair bottom plate, and is formed by pouring through independent dies. The single hollow tread has less casting quantity, less requirement on rigidity of the die and less material consumption for manufacturing the die. The hollow tread plate is connected with the stair base plate in a wet connection mode to form, so that the integrity of the stair structure is ensured. The hollow tread plate is provided with a certain number and length of reinforcing steel bars at the joint surface combined with the stair bottom plate, so that the connection performance between the hollow tread plate and the stair bottom plate is improved. The stair bottom plate is directly positioned on the long line pedestal for production, and a horizontal production mode is adopted; the stairway can be produced in a collinear way, namely, the stairway with the same prestressed tendon specification is configured, and the prestressed tendons are tensioned once, so that tens of stairways can be produced simultaneously, and the production efficiency of the stairway is greatly improved; manufacturing a step fixing frame, which is used for fixing a plurality of steps which are manufactured, uniformly placing the steps on an unset stair base plate at one time, ensuring that each step has the same sinking depth, and ensuring that the stair has better finished product quality; the stair bottom plate mold and the stair fixing frame can be removed after the concrete reaches initial setting, and the stair bottom plate mold and the stair fixing frame are used for pouring and manufacturing other stairs, so that the production efficiency is greatly improved; and after the stairs reach the strength grade, the prestressed tendons can be released and the redundant prestressed tendons can be sheared. The steel bars extending out of the section of the upper end part of the stair need to be kept for a certain length, and the steel bars play an anchoring role in the integral casting of the upper end part of the stair in the later stage; the steps are hollow, namely, after the steps are connected with the stair bottom plate, a triangular hollow cavity is formed between the steps, so that the dead weight of the stair is reduced; compared with the conventional assembled stairway, the upper end support is omitted, so that the volume of the stairway and the concrete pouring amount are reduced, and the dead weight of the stairway is obviously reduced; the stair reduces the consumption of common reinforcing steel bars through the application of prestress, and obviously improves the bearing capacity and rigidity. Compared with the conventional assembly type stairway, the stairway has the advantages that the thickness of the stairway can be reduced by 20-50 mm under the same span specification, and the dead weight is further reduced under the condition that the requirement of the specification on the deflection limit value of the flexural member is met.

The manufacturing process of the stepping comprises the following steps:

firstly, a stepping die which is independently designed is utilized, an inner L-shaped steel plate and an outer L-shaped steel plate are adopted in the die, namely a bottom die 102 and a top die 103, and end dies 101 are arranged on the left side and the right side of the die, so that die assembly is completed. The tread reinforcing mesh 104 is placed in the hollow tread, concrete is poured, and the hollow tread is removed after the concrete is solidified, so that the manufacture of the single hollow tread is completed.

The manufacturing process of the stair bottom plate comprises the following steps:

the stair bottom plate mould is arranged on the long line pedestal and comprises a stair bottom plate side mould 201 and a stair bottom plate end mould 202, wherein the end mould is provided with reserved holes for the prestressed tendons 203 to penetrate and use, and then the prestressed tendons are tensioned. After tensioning, binding a stair reinforcing mesh, arranging a hanging rib 204 at the upper end part, and arranging an embedded part on a stair lower support for later hoisting. After the binding work of the reinforcing steel bar net is completed, concrete pouring and vibrating can be carried out.

The stair assembling process comprises the following steps:

after the concrete pouring and vibrating of the stair bottom plate are finished, preparing a step fixing frame, installing a plurality of required hollow step plates in the step fixing frame 105, tightening the step fixing frame 105 through a screw 106, fixing the hollow step plates, and turning the step fixing frame 105 by 180 degrees through a crane after the installation is finished, so that a step connection face is downward; the step fixing frame 105 is lifted to the stair base plate by the crane again, so that the hollow step plate 1 is sunk into the concrete unset stair base plate 2, and the assembly of the steps and the stair base plate is completed.

And after the concrete reaches an initial setting state, the stepping fixing frame and the stair bottom plate mold can be removed. And after the concrete reaches the strength grade, the prestressed tendons 203 can be released, the redundant prestressed tendons 203 are sheared, and the manufacturing of the assembled prestressed hollow stairway is completed.

The production process has the advantages that the assembly type prestress hollow stairs can realize a collinear production mode, tens of stairs can be manufactured by stretching the prestress rib once, the universality and the reusability of the die are high, and the economic advantage of the die is obvious.

The stair installation process comprises the following steps:

the connecting form of the assembled prestressed hollow stairway is that the upper end is integrally poured with the landing slab of the ladder beam, and the lower end is placed on the landing slab;

firstly, pouring a lower platform, arranging an upper ladder beam and a platform plate template, and erecting a top support; and hoisting the assembled prestressed hollow stairway in place, then, bundling a reinforcing steel bar net required by the upper ladder beam platform plate, and pouring concrete of the ladder beam platform plate after binding is completed. After the concrete is solidified, the templates and the shoring can be detected, and the mounting process of the stairs is completed.

The stair provided by the utility model has the advantages that: the structure is innovative through the prestress technology, the dead weight of the stair is obviously reduced by the hollow design of the steps, and the reduction range can reach more than 40%; the bearing capacity and rigidity of the stairs are obviously improved and the anti-cracking performance is enhanced through the application of prestress; meanwhile, the rigidity is improved, so that the thickness of the stair can be reduced by 20-50 mm compared with the thickness of the stair tread plate with the same specification under the condition that the standard deflection limit value of the bent component is met, and the effect of reducing the dead weight is achieved. The material consumption for manufacturing the stairs is reduced, the production cost of the mould is reduced, the overall manufacturing cost of the stairs is reduced, and the stair has good market application prospect.

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 hollow stair of prestressing force assembled, includes stair bottom plate (2) and a plurality of hollow flier (1), its characterized in that: the novel stair tread comprises a stair tread body and is characterized in that a plurality of hollow tread plates (1) are arranged on the stair tread body (2), a cavity (107) is formed in the hollow tread plates (1), tread plate reinforcing steel bar meshes (104) are arranged in the hollow tread plates (1), prestressed tendons (203) are arranged in the stair tread body (2), and hanging tendons (204) are arranged at the upper end portions of the stair tread body (2).

2. A prestressed assembled hollow stairway according to claim 1, characterised in that: the hollow tread (1) is sunk onto the stair bottom plate (2) with the sinking depth of 3-5mm.

3. A prestressed assembled hollow stairway according to claim 1, characterised in that: the hollow tread (1) is made of concrete and tread reinforcing mesh (104) by adopting an end die (101), a bottom die (102) and a top die (103).

4. A prestressed assembled hollow stairway according to claim 1, characterised in that: the stair bottom plate (2) is made of a stair bottom plate side die (201) and a stair bottom plate end die (202) by using concrete and prestressed tendons (203) and hanging tendons (204).

5. A prestressed assembled hollow stairway according to claim 1, characterised in that: the hollow tread plates (1) are arranged on the stair bottom plate (2) through tread fixing frames (105).

6. A prestressed assembled hollow stairway according to claim 1, characterised in that: the hollow tread plate (1) is fastened with the tread fixing frame (105) through a screw (106).