by Abstract: at present, the method of adding elevators has become an important measure to improve the daily living conditions of residents in old communities and make them live comfortably and conveniently.
The addition of elevator requires the addition of components such as elevator foundation, shaft and roof panel, so as to reduce the impact of the addition of elevator structure on the original structure.
On the premise of meeting the construction quality, the use of precast components and the addition of elevator technology can shorten the construction period, speed up the construction progress and reduce the construction cost.
It is one of the most cost-effective ways to add elevators to existing buildings by using precast components.
By analyzing the urgent problems to be solved in old houses, including safety, thermal insulation and energy saving, durability and use function, this paper puts forward the factors that should be considered in the reinforcement and energy-saving transformation project of old houses, focuses on the increase of elevators, and puts forward the method of breaking the shackles of “residential unit” and increasing elevators according to the principle of “two by two combination of adjacent residents”, In the comprehensive test, shotcrete slab wall, additional angle steel brace, external shear wall, external prestressed steel strand mesh polymer mortar or carbon fiber bonding technology are used to strengthen the structure.
On this basis, flat slope modification, energy-saving transformation, equipment pipeline renewal, waterproof repair and increased security monitoring are carried out to ensure the safety and durability of the structure and improve the living environment, Improve the quality of housing.
Based on the construction preparation, underground engineering, shaft steel structure engineering, roof panel hoisting and waterproof engineering, corridor electrical appliances and internal decoration engineering, ground external engineering and other aspects, this paper discusses the construction technology of adding elevators with precast components in existing buildings, in order to provide reference for the construction of adding elevators in old residential areas.
Many buildings in China were built in the 1980s and 1990s.
At that time, due to the limitations of economic conditions and other factors, the building function was simple, and the existing buildings with 7 floors and below were not equipped with elevators.
With the gradual improvement of urban living standards, people have higher and higher requirements for the quality of life.
At present, the owners of these existing buildings, especially the owners of old houses, are mostly elderly people and the elderly, as well as some disabled people.
It is extremely inconvenient for such people to go up and down the stairs, which restricts their travel and outdoor activities.
In order to solve these problems, these old residential buildings have become the focus of transformation in the transformation of existing buildings.
The method of adding elevators has become an important measure to improve the daily living conditions of residents in old communities and make them live comfortably and conveniently.
The technology of adding electricity to precast components can shorten the construction period, speed up the construction progress and reduce the construction cost.
It is one of the most cost-effective ways to add elevators to existing buildings by using precast components.
Precast precast components are adopted for the existing buildings, and elevators are added, mainly including precast foundation components, prefabrication of hoistway network structure and precast roof panels with special shapes.
All external elevators with “fully precast structure” are adopted.
The construction process includes foundation treatment and the application of special construction methods to prevent uneven settlement, such as “soft connection” and “long round hole” of steel structure.
The steel structure of the elevator is made of special steel containing manganese, which can increase the strength and hardness of the steel and improve the impact resistance and wear resistance.
The project of adding electrical connection to existing buildings involves many disciplines, including pipeline, civil engineering, steel structure, electromechanical and decoration, which shall comply with relevant national standards and technical specifications.
At the same time, it is also necessary to carry out technical demonstration on the design drawings in terms of safety, economy and rationality, so as to ensure that the project is safe and reliable after construction according to the design drawings and meet the expected requirements.
1、 Construction preparation before adding Elevator 1.
Geological survey: according to the relevant design data, analyze and evaluate the physical and mechanical properties of soil and rock on the proposed site through various survey means and methods, And issue detailed “Geotechnical investigation report provides engineering geological data required for design and construction.
2.
Underground pipeline investigation.
The foundation for adding elevators in existing buildings cannot be crossed by underground pipelines.
Therefore, before adding elevators, the underground pipelines that hinder the addition of elevators should be moved.
Before construction, the original layout of underground pipelines should be explored and intuitive pipe drawings should be drawn The line diagram shall be used as the design basis for the design unit to change the pipeline.
2、 Add elevator underground works 1.
Relocation of underground pipelines before adding elevator construction, the transformation of underground pipelines shall be carried out first, and the pipelines at the pre added elevator foundation pit shall be moved according to the design drawings.
This part of work is generally carried out by the unit appointed by Party A.
as the construction unit for subsequent addition of elevators, if conditions permit, it shall enter the site for on-site recording, so as to better understand the position of underground pipelines after removal.
2.
After the foundation pit excavation and protection underground pipeline reconstruction are completed, the foundation pit excavation of adding elevator shall be started.
Before earth excavation, determine the excavation scheme and take corresponding safety measures.
Since the construction is carried out in front of the residential building, in order not to affect the normal life of residents, the foundation pit excavation is generally carried out by the excavation method of mutual cooperation between machinery and labor.
After earth excavation, a safe and reliable temporary protective channel shall be erected in time.
The channel shall be erected by scaffold steel pipe.
Since the old houses with elevators are generally dominated by the elderly, the width of the erected channel shall at least meet the width of one wheelchair.
Generally, wooden boards and anti-skid pads shall be laid on the scaffold steel pipes to facilitate residents’ travel.
Safety warning signs shall be set around the additional elevators, and night lighting shall be done well.
After the temporary protective passage is completed, the foundation pit shall be neatly sealed with enclosure, and reflective strips and falling caution icons shall be pasted..
