Flexible Connetctors System Of Seismic Isolation Pipeline For Buildings

When an earthquake occurs, the pipeline system is rigidly connected and has no ability to compensate for seismic displacement by itself. If no measures are taken, the pipeline will undergo plastic deformation until it is damaged and broken. As a result, the drainage system, HVAC (Heating, Ventilation and Air Conditioning) system, ventilation system, electrical system, etc. will lose their functions, further posing potential safety hazards. Seismic isolation measures should be taken for the seismic isolation area, and seismic isolation flexible connection modules for different nodes and working conditions should be set up to endow these nodes with the ability to compensate for seismic displacement.

The seismic isolation flexible connection module is a series of modular pipeline system seismic isolation products developed for the synchronous seismic isolation of pipelines in seismic isolation buildings. It is specifically designed to solve the problem of compensating for the seismic displacement of pipelines that pass through the structural layer of the seismic isolation layer for the purpose of conveying fluids or energy.

 

Through-type Seismic Isolation Series
The through - type seismic isolation series is applied to the mechanical and electrical pipelines that pass through and are similar to passing through the isolation layer, with both ends respectively restrained by the upper structure and the lower structure of the isolation layer. It can solve the problems of seismic isolation, thermal compensation, load calculation of supports and hangers, and check of allowable loads at equipment interfaces for the through - type pipelines.

 

The leap - type seismic isolation series is applied to the mechanical and electrical pipelines that span and are similar to spanning the isolation joint, with both ends respectively restrained on both sides of the isolation joint or the isolation trench. It can solve the problems of seismic isolation, thermal compensation, load calculation of supports and hangers, and check of allowable loads at equipment interfaces for the leap - type pipelines.

Earthquakes are one of the most significant natural disasters that affect humanity. After an earthquake occurs, it can cause serious casualties and property losses, as well as extensive damage to building structures, mechanical and electrical systems, bridges, etc., bringing great losses to our lives and properties. The state has issued corresponding seismic isolation standards and specifications. The technology of building seismic isolation has been promoted and applied in China. Seismic isolation technology can prevent the damage of earthquakes to buildings and pipelines, enabling some important places such as schools, kindergartens, hospitals, etc. to meet the normal use requirements during natural disasters like earthquakes, reducing casualties and property losses.
When an earthquake strikes, if the pipeline system is rigidly connected and has no ability to compensate for seismic displacement by itself, without taking any measures, the pipeline will undergo plastic deformation and may even be damaged and broken. As a result, the drainage system, HVAC system, ventilation system, electrical system, etc. will lose their functions, further posing potential safety hazards. For the pipelines in the seismic isolation area, a flexible pipeline design should be adopted, and pipeline seismic isolation flexible connection modules for different nodes and working conditions should be set up to endow the entire pipeline system with the ability to compensate for seismic displacement.

2.1,Regulations on the Management of Seismic Design of Construction Projects: Article 16... Newly built schools, kindergartens, hospitals, elderly care institutions, children's welfare institutions, emergency command centers, emergency shelters, radio and television buildings, etc. located in areas with high seismic fortification intensities and key earthquake monitoring and prevention areas shall adopt technologies such as seismic isolation and shock absorption in accordance with relevant national regulations to ensure that they can meet the normal use requirements when an earthquake of the fortification intensity of the region occurs.

2.2,Building Seismic Isolation Design Standard GB/T 51408-2021:
Clause 5.5.1 Stairs, handrails, entrance halls, steps, elevators, basement ramps, driveway entrances and other fixed facilities passing through the seismic isolation layer should avoid possible obstruction and collision under the action of an earthquake, and disconnection or deformable structural measures should be taken.
Clause 5.5.2 General pipelines passing through the seismic isolation layer should adopt flexible measures at the seismic isolation layer, and the reserved horizontal deformation amount should not be less than the width of the isolation joint.
Clause 5.5.3 For important pipelines passing through the seismic isolation layer, as well as pipelines that may leak harmful or flammable media, flexible measures should be adopted at the seismic isolation layer, and the reserved horizontal deformation amount should not be less than 1.4 times the width of the isolation joint.

2.3, Code for Construction and Acceptance of Building Seismic Isolation Projects TGT360-2015:
Clause5.4.1 Flexible connections or other effective measures should be adopted for the piping and wiring of equipment passing through the seismic isolation layer.
Clause5.4.2 For important pipelines that may leak harmful or flammable media, flexible connections should be adopted when they pass through the position of the seismic isolation layer.
Clause5.4.3 For flexible pipelines passing through the seismic isolation layer, a sufficient extension length should be reserved at the seismic isolation joint.
Clause5.4.4 When using structural steel as a lightning conductor, flexible conductors should be used to connect the rebars above and below the seismic isolation layer.

2.4,Code for Seismic Design of Buildings GB 50011-2010:
The seismic isolation layer should provide the necessary vertical bearing capacity, lateral stiffness and damping. The piping and wiring of equipment passing through the seismic isolation layer should adopt flexible connections or other effective measures to adapt to the horizontal displacement of the seismic isolation layer during rare earthquakes.
"During the Wenchuan earthquake in 2008, the superstructures of the seismic isolation buildings in the areas with seismic intensities of 7 and 8 were intact, but the pipelines in the seismic isolation layer were damaged. Therefore, special attention should be paid to improvement."

Technical References:
Flexible Seismic Isolation Pipelines for Buildings JG/T 541-2017
General Technical Conditions for Corrugated Metal Hoses GB/T14525-2010

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