Flat Space Frame Structure

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Analysis Of Engineering Examples Of Flat Space
Frame Structure

• Capital Airport A380 Hangar

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Overview

• The A380 hangar is located on the north side of
  Terminal 3 of the Capital Airport. The total
  construction area of the project is 64,000 m2,
  with 3 floors above ground and 1 underground
  floor. 176.3m, depth 110m, roof elevation
  39.800m. After completion, it can accommodate 4
  A380 Airbuses or 2 A380 and 4 B747 large
  passenger aircrafts at the same time. It is
  currently the world's largest aircraft
  maintenance warehouse. The roof structure is a
  three-layer welded spherical steel space frame
  with a total area of 39,000 m2 and a total mass
  of about 7,000 tons. It adopts a construction
  plan of ground assembly and an overall lifting in
  place, and its one-time lifting area and weight
  can be called the world's largest . The overall
  improvement of the roof structure in the
  construction of the hangar is undoubtedly the
  biggest technical difficulty.

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Floor plan
The capital airport hangar can hold four Boeing
747 large passenger planes for maintenance at the
same time. Due to the special function of the
hangar and the special requirements for space,
the layout adopts the layout of the large space
on one side and the auxiliary room on the other
side of the hangar, so that the large space of
the hangar is made up.
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Internal space
The main space inside the hangar is a large space
for airplanes to dock, and its height and span
are larger than those of ordinary buildings, and
it is required that there are no obstacles such
as pillar nets inside.
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Facade modeling
The overall shape of the hangar is square, and
the facade is made of transparent glass. With
structural features, the whole building appears
light and simple.
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Structural analysis

• The roof structure design is the key to the
  design of a large-span hangar. The formulation of
  the plan must meet the following requirements
  According to the height of the airport airspace,
  the highest point of the hangar roof should not
  exceed 40m the layout and size of the roof
  structure should meet the technical use and
  setting The requirements of the suspension crane,
  the deformation of the roof structure does not
  affect the normal operation of the suspension
  crane and the hangar gate the hangar can meet
  the seismic fortification requirements of an 8
  degree earthquake at the same time, it is also
  necessary to consider the reasonable and reliable
  roof structure production, transportation, and
  hoisting. Speed up the construction cycle.
  According to the above principles, after
  comparing various schemes, a spatial structure
  system combining multi-layer quadrangular pyramid
  space frame and bolt-welded steel bridge was
  selected.

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Structural plan and elevation
The structure plan and elevation of the hangar
are shown in the figure. The space frame side
beams at the gate of the hangar are designed as a
box-shaped space truss with two-span continuous
steel beams with a width of 9.5m and a height of
11.5m.
Structure plan
Structural elevation
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Engineering difficulties

• 1. The steel structure has a large span and area,
  which is the largest at home and abroad the
  steel structure of this project has a span of
  352.60m, a depth of 114.5m, and a roof elevation
  of 39.800m. The roof structure adopts
  three-layer obliquely placed quadrangular pyramid
  steel space frame frame, supported by the lower
  chord, and the roof of the hangar gate adopts a
  welded box-shaped steel truss, with a width of
  9.5m and a height of 11.5m. For the construction
  of such a large-span structure, there is no
  domestic precedent and mature construction
  experience that can be used for reference. The
  scientific construction plan is selected to
  ensure the quality of the project, ensure the
  safety of the structure itself and the
  construction safety, effectively control the
  construction progress, and reasonably reduce the
  construction cost. The top priority of this
  project and similar projects must be in-depth and
  detailed research.

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Engineering difficulties

• 2. High quality requirements for structural
  assembly The steel structure of this project
  adopts a three-layer obliquely placed
  quadrangular pyramid steel space frame structure
  combined with a steel truss, with a span of
  352.60m, a depth of 114.5m, and a complex
  structure. The measurement of the plane control
  network during construction The accuracy
  requirements are very high how to take the
  correct assembly method, assembly accuracy
  control measures according to the characteristics
  of the structure itself, and how to ensure the
  final closure of the overall structure after
  assembly requires careful study. In addition, the
  project has a huge number of components and
  various on-site node forms. How to combine
  structural span, depth, height and structural
  form characteristics, take effective welding
  process and welding quality control measures to
  ensure welding quality and overall structural
  assembly quality is the difficulty of this
  project .

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Engineering difficulties

• 3. Heavy tasks and tight schedule
• The total construction period for the four seats
  of the Capital Airport is three years. In order
  to meet the needs of putting into use before the
  Olympic Games, this project shortened the
  conventional 36-month construction period to 20
  months.

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Selection of construction plan

• The existing construction schemes include
  high-altitude bulk assembly, segmented hoisting
  and overall lifting, but considering their
  respective advantages and disadvantages, manpower
  and material resources, safety management and
  other conditions, the overall lifting
  construction technology was finally selected. The
  advantage is that a large amount of work can be
  completed on the ground, reducing the amount of
  tooling scaffolding, avoiding high-altitude
  operations, and reducing the difficulty of
  project safety management. Due to the large site
  area, multi-point and multi-face flow operations
  can be formed, which speeds up the progress of
  ground assembly and facilitates the control of
  engineering installation accuracy.

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Overall promotion technology

• In order to meet the boundary conditions of the
  structural design to the greatest extent and
  ensure the quality of the project speed up the
  progress of the project construction and create
  conditions for the follow-up work reduce the
  cost of the project and ensure the safety of the
  construction. For this project, a one-time
  overall lifting construction technique is
  adopted. The one-time overall lifting structure
  has the following advantages the weight of the
  lifting structure can reach more than 10,000
  tons the size, area and volume of the lifting
  structure are large computer control, high
  degree of automation reducing the amount of
  high-altitude work, the construction is safe,
  reliable, and lower Construction risk shorten
  the construction period and reduce the
  construction cost. Based on the above analysis,
  we decided to adopt the scheme of simultaneous
  lifting of the net frame and the truss.

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Multi-point and multi-face ground assembly work
at the construction site
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Improve the assembled spaceframe at one time
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Summarize

• Large span and high height have become the key to
  the structure design of the hangar
• Select the space structure system combining
  multi-layer quadrangular pyramid space frame
  frame and bolt-welded steel bridge
• Capital Airport A380 hangar uses one-time overall
  lifting technology to assemble the flat space
  frame structure
• The shape is simple and light