Overview of building displacement industry Building displacement is an activity with high technical content, which is closely combined with building structural mechanics and geotechnical engineering technology.
In 2001, the building seismic isolation technology and energy dissipation and damping technology were written into the national standard code for seismic design of buildings (GB50011-2001) With the improvement and change of seismic requirements and fortification standards, many buildings need seismic treatment because they can not meet the seismic requirements of new fortification.
China’s urbanization construction is gradually changing from large-scale demolition and construction and construction instead of reform to the stage of “can be changed but not dismantled”, and some valuable buildings will be retained through maintenance and reconstruction.
Overview of building reinforcement industry Building reinforcement refers to taking reasonable maintenance, reinforcement, structural transformation and other measures to improve the safety and durability of the structure, meet the normal use function of the building and prolong the safe service life of the building within the whole service life of the building, based on scientific inspection and appraisal, including reinforcement of existing buildings after reaching the design service life, performance maintenance of existing buildings and some new buildings Building use function transformation and damage remedy caused by design and construction.
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The construction site is narrow and difficult to construct Complex conditions, tight construction period, difficult design and construction of foundation pit retaining engineering and high technical requirements.
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Some valuable buildings will be retained through maintenance and transformation.
Overview of foundation pit support industry.
Building inclination will be caused by uneven foundation, uneven load or disturbed foundation soil.
The main technical treatment is to cut off the building at a certain horizontal plane and separate it from the foundation into a movable “heavy object” ; set a underpinning beam at the cut-off point of the building to form a movable joist; set a new foundation at the place where it is in place; set a walking track beam between the old and new foundations; install the walking mechanism and apply external power to move the building; after it is in place, remove the walking mechanism to connect the upper and lower structures, so far the displacement is completed.
Policy analysis At present, the maintenance and transformation of foundation and existing buildings have been supported by a number of national industrial policies, mainly including the opinions on promoting the sustainable and healthy development of the construction industry issued by the general office of the State Council “Deepen the reform of ‘release management and service’ in the construction industry, improve the regulatory system and mechanism, optimize the market environment, improve the project quality and safety level, strengthen team construction, enhance the core competitiveness of enterprises, promote the sustainable and healthy development of the construction industry, and create the ‘build China’ brand.” the national development and Reform Commission’s national key energy-saving and low-carbon technology promotion catalogue involves “New technologies and processes for energy conservation and environmental protection in the construction industry will promote energy conservation and intensive utilization of energy resources.
Overview of building isolation industry The period from 1977 to 1987 was the initial stage of China’s seismic isolation industry, during which the seismic reinforcement technology for civil brick buildings and the technical measures for seismic reinforcement of industrial and civil buildings were compiled.
among them, building deviation correction and displacement and structural reinforcement are closely related to foundation or foundation pit support engineering.
Concrete, reinforced concrete and steel have good processing performance, can be made into various sections and shapes, and their strength, stiffness and bearing capacity can meet the design requirements In addition, pile foundation is also used to bear horizontal force and uplift force and improve the anti inclination and anti floating capacity of buildings.
Deep and large foundation pits mostly appear in the central urban area, close to buildings, traffic trunk roads, subway tunnels and various underground pipelines.
China’s urban land resources are becoming increasingly tense, a large number of high-rise and super high-rise buildings are emerging, there are more and more deep foundation pit projects, and the foundation pit support engineering is developing in the direction of large depth and large area.
The development and utilization of underground space is an important development trend of structural engineering in the 21st century.
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In the design and construction of foundation and existing building maintenance and reconstruction, foundation includes pile foundation construction, foundation pit support, foundation treatment and slope support; The maintenance and reconstruction of existing buildings include isolation reinforcement, structural reinforcement, overall displacement, deviation correction, jacking and forced landing, underground space development and utilization, cultural relics protection, etc.
According to the manufacturing process, pile foundation is divided into precast pile and cast-in-place pile.
With China’s economic development, the continuous advancement of urbanization, the continuous expansion of the scale of infrastructure construction, the increasing shortage of construction land, the increasing number of high-rise buildings, the corresponding expansion of the volume of foundation, and the booming trend of supply and demand in the industry.
Foundation pit support works span engineering geology, soil mechanics, foundation engineering and structure Mechanics, in-situ testing technology, construction technology, soil structure interaction and environmental geotechnical engineering, covering civil engineering fields such as housing construction, water conservancy, bridge, port, municipal administration, public facilities, underground engineering and offshore engineering.
Overview of pile foundation industry Pile foundation is widely used not only in industrial and civil buildings, high-rise buildings and heavy storage foundations, but also in Jianghai bridge, urban viaduct, high-grade highway, railway and other fields.
SH) Founded on April 26, 1997, Shanghai chengdi Construction Co., Ltd.
Deviation correction usually requires comprehensive use of jacking, forced landing, resistance settlement and other methods.
Overall, with the promotion of economic development and urbanization, the foundation industry will continue to develop steadily with the development and construction of public facilities such as real estate, rail transit, roads and bridges, airports and ports.
Compared with the traditional civil construction engineering, the maintenance and reconstruction of existing buildings is a new engineering field.
Their advantages and disadvantages are as follows: Figure 1: advantages and disadvantages of precast pile and cast-in-place pile.
(2) overview of existing building maintenance and reconstruction industry Maintenance and reconstruction of existing buildings refers to special professional projects that are different from the conventional construction technology in civil engineering and need special construction technology, such as isolation reinforcement, structural reinforcement, overall displacement, deviation correction, jacking / forced landing, underground space development and utilization, cultural relics protection, etc.
is mainly engaged in foundation and foundation engineering services such as pile foundation, foundation pit support and related design in geotechnical field, including construction services of foundation engineering such as static pile pressing, bored pile, cement soil mixing pile, application of prefabricated assembly components of underground structure, as well as soil retaining and water stop structure of foundation pit support and foundation reinforcement Good, earth rock engineering construction, etc., business areas include real estate, municipal engineering, public facilities, industrial plants, etc..
According to the national new urbanization plan (2014-2020) issued by the CPC Central Committee and the State Council on March 16, 2014 , by 2020, the urbanization rate of China’s permanent population will reach about 60%, and the investment demand will be about 42 trillion yuan.
Analysis of competitive enterprises (1) Shanghai Urban Construction Co., Ltd.
Compared with the traditional civil construction engineering, the maintenance and reconstruction of existing buildings is a new engineering field.
Industry overview of building deviation correction Building deviation correction refers to taking rectification, righting and reinforcement measures for buildings that deviate from the vertical position and incline to restore their normal use function.
Energy users will be guided to adopt advanced and applicable new energy-saving technologies, new equipment and new processes to alleviate the pressure on resources and environment.” The introduction of the policy has created a good environment for the development of foundation and existing building maintenance and reconstruction industry, which will promote the development of the industry in a long period of time.
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China’s urbanization construction is gradually changing from large-scale demolition and construction and construction instead of reform to the stage of “can be changed but not dismantled”.
The construction technology of foundation pit support mainly includes two-axis cement soil mixing pile, three-axis cement soil mixing pile, bored pile and soil nailing wall And underground continuous wall.
Overview of underground space development and utilization industry Underground space covers a wide range, such as underground transportation facilities, commercial facilities, underground garage, municipal public welfare pipeline facilities, urban comprehensive disaster prevention construction, military engineering, storage facilities and underground space of high-rise buildings.
Market analysis (1) overview of foundation industry The foundation market is mainly affected by the market demand of various segments of downstream industries.