Reinforced concrete stair with local steel plate type sliding device on support

Abstract

The invention relates to a reinforced concrete stair with a local steel plate type sliding device on a support, which belongs to the field of the concrete structure and is mainly used for the building engineering. The reinforced concrete stair adopts a reinforced concrete cast-in-place plate-type stair, wherein the upper end of the reinforced concrete cast-in-place plate-type stair is integrally cast with a supporting construction member on a main body structure floor or a rest platform of the main body structure, and the lower end of the reinforced concrete cast-in-place plate-type stair is provided with a horizontally sliding support supported by the local steel plate. The setting method comprises the following steps of: on the lower surface at the lower end of a stair section plate and the upper surface of a lower-end supporting construction member, respectively arranging one row of upper embedded steel plates and one row of lower embedded steel plates which are pulled open for a space along the width direction of the stair section plate, correspond one by one vertically and extrude out of the support of a respective concrete surface; ensuring that the upper steel plates and the lower steel plates are in contact supporting; fully laying a graphite powder layer on the supporting surface; and keeping the rest of gaps as the gaps, or to be separated by a polystyrene foam plate. The reinforced concrete stair disclosed by the invention provides an economic technical measure convenient to implement for lightening earthquake damage to the building stair and the integral structure, and can be popularized and applied to the multi and high rise concrete building structure systems in a seismic area, especially to the frame structure.

Description

Technical field [0001] The invention relates to a reinforced concrete staircase with a support provided with a local steel plate type sliding device, which belongs to the field of concrete structures and is mainly used in construction projects. Background technique [0002] The cast-in-situ reinforced concrete staircase of the traditional construction method participates in the anti-lateral force work as an oblique member during an earthquake, which not only increases the rigidity of the main structure, but also causes uneven stiffness distribution in the floor plan, which has a great impact on the overall analysis results of the structure , And often make the stairs become the first anti-seismic defense line and destroyed earlier, it is difficult to ensure the realization of its personnel evacuation and rescue functions, especially the greater impact on the frame structure. In the 2008 Wenchuan Earthquake, the damage to the stairs in particular caused widespread attention. Ther...

AI Technical Summary

Problems solved by technology

However, there are some deficiencies in the existing literature atlas for this type of sliding bearing. For example, the sliding bearing often adopts the structural form of full contact surface support, which consumes a lot of sliding layer materials, which is uneconomical, and the sliding surface is too large. Larger, resulting in increased sliding friction, affecting the sliding effect; and some need to use expensive polytetrafluoroethylene backing plate, although it has the advantage of small sliding friction coefficient, but due to the high cost, some performance improvement requirements in this area are originally required. Low-level engineering users are reluctant to use it; therefore, it has not been used much in actual engineering so far.

Images