CN112112374A

CN112112374A - Novel reinforced concrete prefabricated stair end connecting method

Info

Publication number: CN112112374A
Application number: CN202010957439.9A
Authority: CN
Inventors: 朱辉祖
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-13
Filing date: 2020-09-13
Publication date: 2020-12-22

Abstract

The invention discloses a novel reinforced concrete prefabricated staircase end part connecting method, which relates to the field of building structures, and changes the connecting mode of the upper end hinged and the lower end sliding of a conventional prefabricated staircase into the mode of directly placing on the upper surface of a leveling mortar layer of a bracket support of a cast-in-place ladder beam, thereby simplifying the connecting mode of the end part of the conventional prefabricated staircase, saving building materials, reducing the prefabrication and installation cost, accelerating the production and installation progress, improving the installation effect of the staircase, and having the social benefits and the economic values of rapid construction, energy conservation and material conservation.

Description

Novel reinforced concrete prefabricated stair end connecting method

Technical Field

The invention relates to the technical field of building structures, in particular to a novel reinforced concrete prefabricated staircase connecting method for a high-rise residential building of an assembled reinforced concrete house.

Background

The standardization degree of the multi-stair of the number of floors of the existing fabricated building high-rise dwelling house is extremely high, and the prefabricated stair can obviously reduce the workload of on-site formwork erecting and formwork removing, improve the quality of on-site engineering, improve the on-site civilized construction level and accelerate the construction progress. Prefabricated staircase specialized atlas has been released for many years, and the geometric dimension, arrangement of reinforcement, the connected node of stair have formed standardized design and construction, and this atlas prefabricated staircase upper end generally adopts articulated fixed connection, and the lower extreme adopts sliding connection, and 2 holes respectively are reserved at upper and lower both ends, need insert prefabricated staircase tip preformed hole with pre-buried bolt of ladder roof beam bracket support or reinforcing bar during the installation, and it is great to inserting difficult to say to the hole because prefabricated staircase heavily rocks the range, consumes more man-hour.

The shear wall structure is adopted in high-rise houses mostly, the overall lateral stiffness of the houses is high, generally, cast-in-place integral stairs have little influence on the overall stiffness, the earthquake action absorbed by the stairs is very limited, and the stairs cannot be damaged at all under the earthquake action, which is proved by cast-in-place integral shear wall structures integrally cast by most of the stairs, and shows that even if the integral casting does not release the rigidity of the stairs, the whole main body structure is not adversely affected, so any stair connection mode for releasing the rigidity can be accepted, and the method for fixing the upper end and sliding the lower end to release the rigidity is not unique.

This atlas node way has increased during hoist and mount preformed hole and embedded steel bar accurate positioning and has inserted the process, because the heavier swing inertia of general stair leads to hoist to take one's place to adjust and can consume more installation time, also indirectly increases the high risk of weighing down of construction workman.

The prefabricated time preformed hole of current stair mill is more, need take extra hole built-in fitting to consolidate the location and prevent blockking up the measure when the mill is prefabricated, and the prefabricated stair generally adopts vertical template production to need special measures to guarantee the positioning accuracy of preformed hole especially, has just so indirectly increased prefabricated manufacturing cost.

The horizontal fixing limit adopted only on one section of the stair enables the part to absorb all earthquake counter-force, so that additional construction and reinforcement measures need to be adopted on the part, and meanwhile more detailed structural calculation analysis and construction measures need to be adopted on the support bracket.

Disclosure of Invention

The reinforced concrete prefabricated staircase connecting method simplifies the connecting mode of the end parts of the conventional prefabricated staircase, saves building materials, reduces the prefabrication and installation cost, quickens the production and installation progress and improves the staircase installation effect.

The technical scheme adopted by the invention for solving the technical problems is as follows: the existing connection mode that the upper end of the conventional prefabricated structure is hinged and the lower end of the prefabricated structure slides is changed into the mode that the prefabricated structure is directly placed on the upper surface of the leveling mortar layer of the bracket support.

The reinforced concrete prefabricated staircase connecting method has the direct effects that: the connecting mode that the upper end is hinged and the lower end slides, which is widely used by the conventional prefabricated staircase, is overturned, and the conventional prefabricated staircase is directly placed on the bracket support leveling mortar layer instead, so that the prefabricated staircase has the social benefits and the economic values of rapid construction, energy conservation and material conservation, and greatly promotes the development of modern fabricated reinforced concrete building construction.

Drawings

The following detailed description of the invention refers to the accompanying drawings.

Fig. 1 is a sectional view of the upper end of the prefabricated staircase connecting method according to the present invention.

Fig. 2 is a lower end sectional view of the prefabricated staircase connection method of the present invention.

The method comprises the following steps of 1-metal partition strip, 2-35x35 PE rod, 3-cavity, 4-leveling mortar, 5-bracket support, 6-main structure cast-in-situ ladder beam, 7-prefabricated stair upper end, 8-prefabricated stair lower end and 9-cast-in-situ ladder beam and bracket internal reinforcing steel bar.

Detailed Description

The most key concept of the invention is as follows: the existing connection mode that the upper end of the conventional prefabricated structure is hinged and the lower end of the prefabricated structure slides is changed into the mode that the prefabricated structure is directly placed on the leveling mortar layer of the bracket support.

In order to explain technical contents, structural features, objects, and effects of the present invention in detail, the present invention will be explained in detail with reference to the accompanying drawings in conjunction with embodiments.

Referring to fig. 1 and 2, the prefabricated staircase comprises a prefabricated staircase upper end 7, a prefabricated staircase lower end 8, a main structure cast-in-place ladder beam 6, a bracket support 5, a cast-in-place ladder beam and a bracket internal reinforcing steel bar 9.

Further, the method comprises the following steps: cast-in-place ladder beam 6 of major structure is equipped with bracket support 5, and its inside all disposes reinforcing bar 9. The quantity of the reinforcing steel bars is determined by calculation of a structural professional engineer

Further, the method comprises the following steps: the extending width and the thickness of the bracket support 5 are respectively not less than 200mm and 150 mm.

Further, the method comprises the following steps: and a layer of leveling mortar 4 with the thickness not less than 20mm is paved on the upper surface of the bracket support 5.

Further, the method comprises the following steps: and a cavity 3 is arranged between the upper end 7 of the prefabricated staircase, the lower end 8 of the prefabricated staircase and the cast-in-situ ladder beam 6 of the main structure.

Further, the method comprises the following steps: the cavity 3 can ensure limited free sliding left and right of the prefabricated staircase.

Further, the method comprises the following steps: the top of the cavity 3 is provided with a 35x35 PE rod 2 for blocking the cavity, and meanwhile, the free sliding of the cavity can be ensured.

Further, the method comprises the following steps: the 35x35 PE rod 2 is provided with a metal dividing strip 1 to protect the cavity from being blocked.

Further, the method comprises the following steps: leveling mortar 4 is used for adjusting roughness and horizontal plane elevation when prefabricated staircase installation.

Further, the method comprises the following steps: the leveling mortar 4 is in free contact with the upper end 7 of the prefabricated staircase and the lower end 8 of the prefabricated staircase, and the prefabricated staircase cannot slide when the horizontal inertia force is larger than the static friction force.

Further, the method comprises the following steps: the leveling mortar 4 is in free contact with the upper end 7 of the prefabricated staircase and the lower end 8 of the prefabricated staircase, and when the horizontal inertia force is larger than the static friction force, the prefabricated staircase can be released to slide freely.

Further, the method comprises the following steps: the cavity 3 can provide the maximum space and horizontal distance for the free sliding of the prefabricated staircase, and once the distance is exceeded to the side surface of the cast-in-situ staircase 6 of the main body structure, the movement of the staircase is prevented, the staircase is prevented from falling off, and the safety in use of the staircase is protected.

The first … … and the second … … are only used for name differentiation and do not represent how different the importance and position of the two are.

Here, the upper, lower, left, right, front, and rear represent only relative positions thereof and do not represent absolute positions thereof.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A novel reinforced concrete prefabricated staircase end connection method is characterized in that: the utility model provides a novel reinforced concrete prefabricated plate stair, prefabricated length of the upper end and the lower extreme of prefabricated stair is not less than 200mm, and thickness is not less than 150mm, and the tip cross-section is the rectangle.

2. A novel reinforced concrete prefabricated staircase end connection method is characterized in that: adjacent main body cast reinforced concrete ladder beams connected with the upper end and the lower end of the prefabricated staircase are provided with outwards extending bracket supports, and the outwards extending width and the thickness of each bracket are not less than 150 mm.

3. A novel reinforced concrete prefabricated staircase end connection method is characterized in that: before the stair is installed, a layer of leveling mortar with the thickness not less than 20mm is paved on the surface of the bracket support.

4. A novel reinforced concrete prefabricated staircase end connection method is characterized in that: after the lifting, the prefabricated staircase accurately adjusts the position of the leveling surface at a position 200-300mm away from the upper part of the support, and then slowly falls down to directly place the upper end and the lower end of the staircase on the leveling mortar layer on the support.

5. A novel reinforced concrete prefabricated staircase end connection method is characterized in that: the gap between the side surface of the upper end part and the lower end part of the prefabricated staircase and the side surface of the staircase beam is not less than 30mm, and the top of the gap is plugged and filled by flexible caulking materials.