Brief introduction of steel structure construction scheme for roof of Huangpu Sports Center

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Brief introduction of steel structure
construction scheme for roof of Huangpu Sports
Center
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Mainly from the following aspects

• Project summary
• Introduction to steel structure
• Construction difficulties and key points
• Construction plan and process
• Main technical measures

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?. Project overview
Guangzhou Huangpu Sports Center Gymnasium covers
an area of about 7,000 square meters, with a
construction area of about 14,000 square meters,
and about 5,000 seats for spectators (including
about 3,500 fixed seats and 1,500 mobile seats).
The size of the competition venue is 40m50m, and
the maximum single span is 80 meters. The
building has one floor underground and four
floors above ground, with a height of 22.4
meters. The structure of this project is
reinforced concrete frame structure and steel
truss roof structure. Structure design service
life is 50 years, building fire resistance grade
is b.
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?. Project overview
There are altogether 8 steel truss roof trusses
in the competition hall, each of which weighs
about 52 tons. The length of the truss is 72.2
meters, and the supporting distance is 67.8
meters. The structural form of the members is
18004500 rectangular round steel tube truss. The
upper chord is f42611, the lower chord is
f40210, the belly is f1595, f1806, and the
support is f2036.5. The material is Q345B steel.
The steel truss is supported by seismic ball
bearings, and the seismic ball bearings and steel
trusses are converted and connected by steel ball
bearings. There are about 84 seismic ball
bearings, and all seismic ball bearings are
two-way movable hinge bearings. The upper and
lower chord rods of the truss are longitudinally
and horizontally equipped with a bridle path,
with a total weight of about 37.9 tons and a
total length of about 378.7 meters. The bridle
path is welded with the lower chord rod and
support plate. The roof of the training hall is
equipped with four trusses, 38 meters long and
each truss weighing about 26 tons. Twenty trusses
are 8 meters long and each truss weighs 5.5 tons.
The support spacing is 38 meters, and the
structural form of the component is the vertical
plane square steel pipe truss with well shape.
The cross-section of the component the upper and
lower strings are ? 40040024, the belly rod ?
2502508, and the supporting connecting rod I40c
and I50a are made of Q345B steel. All the steel
trusses are supported by seismic ball bearings,
and the seismic ball bearings and steel trusses
are converted and connected by steel ball
bearings. There are about 16 seismic ball
bearings, and all seismic ball bearings are
two-way movable hinge bearings.
Guangzhou Huangpu Sports Center Gymnasium
project
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??steel structure introduction
Dome steel tube space truss
Inner truss of square steel pipe

• The steel structure of the project is
  divided into two parts the square steel facade
  truss of the training hall and the round steel
  tube standing truss roof structure of the
  competition hall. The footpath and skylight are
  auxiliary structural systems. Adopt 100 seismic
  ball bearing as fulcrum. The steel structure uses
  about 900 tons of steel.

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?? steel structure introduction
Structural form the local steel structure adopts
completely different structural forms due to its
different structural functions.
Competition hall the space
three-dimensional component is mainly composed of
four main rods combined into a space
three-dimensional component, the main combination
rod is round steel tube
Upper chord
CHS
Upper chord
Lower chord
CHS
Training hall single plane member is a
plane truss member composed of two main bars and
assumed dry belly bars. The main component of the
bar is the section of square steel pipe
Lower chord
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??Key points analysis
The construction area of the project is wide, and
the hoisting is divided into two zones. The
working conditions in each zone are different,
and the site installation span is large, the
weight of the components is heavy, and the
hoisting is difficult.
Temporary support frame
Temporary support frame
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??Key points analysis
2. Due to the large size of components, limited
by transportation conditions, it is impossible to
complete the production and assembly tasks in the
factory. Assembly operations of nearly 900 tons
of components need to be carried out on site.
3, the construction site is narrow, lifting
sequence and lifting line is really very
difficult.
4, the number of support, high installation
accuracy requirements.-
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??Key points analysis
5, large span, heavy truss installation in the
air, the use of high butt truss installation
bracket is an important link in the construction
of this project, the support bracket setting is
particularly important.
The installation height of steel trusses on the
roof of the competition hall is above 16.5m, the
length of the trusses is 72.2m, the distance
between the supports is 68M, and the weight of a
single truss is about 52 tons. Therefore, it can
be seen that the working radius and lifting
weight of the truss hoisting machine are
reasonably divided into sections, and the
supporting tire frame is set at the sections.
Support bracket setting points refer to the
sectional plan of the truss. The bracket is
constructed by the Bailey truss.
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?.Construction plan and process -- Area
This project construction plane is divided
into two big areas, namely training hall,
competition hall.
Construction site of training centre
Construction site of training centre
The lifting area of the training hall
Hoisting area of the competition hall
The installation sequence will follow the
following original progression planar, diffused
installation from side to side On the facade,
components from The lower part is gradually
installed upward, that is, after the first
training hall is installed, then the competition
hall is installed, and finally the roof structure
is partial.
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?.Construction plan and process - layout
The construction of the roof of the training
hall is carried out from axis D to axis J and
from axis 1 to axis 7. The competition hall
roof construction is in accordance with the C
axis to K axis, from 7 axis to 17 axis of the
main direction of expansion
Temporary storage yard of training hall
Hoisting direction of the competition hall
Training hall hoisting direction
Temporary storage yard of competition hall
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??Construction plan and process -- crane selection

• One 50 tons, one 80 tons, one 120 tons of
  truck cranes as components, materials vertical
  transportation, assembly, lifting in place of the
  main equipment installation.

After the components are transported to the site
by car, a 25-ton vehicle will be hoisted in the
site to assist unloading.
The assembly site is equipped with a 50T truck
crane to cooperate with the assembly operation.
The training hall selected an 80-ton truck crane
to lift the whole truss into place
For partial hoisting of the competition hall, a
120-ton automobile crane is selected to lift the
assembly unit to the design position.
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?.Construction plan and flow - Installation
sequence
The construction of the project according to the
area, according to the construction of lifting
unit progress assembly, lifting, welding, fire
painting process progress, the formation of
assembly, assembly, lifting, adjustment, fixing,
testing, painting, acceptance of the flow of
work. Training hall, competition hall concrete
construction column leg construction insert
embedded bearing construction, concrete structure
to reach the strength of the opening spherical
bearing construction, roof structure steel tube
truss installation, after the installation of the
support, the first installation of the steel
beam, then the installation of the middle hanger,
and finally the installation of the upper chord
and the middle support. Installation sequence 1.
Install the transverse main truss of e-H axis of
the training hall 2. Install the longitudinal
main truss of axis 1-5 of the training hall 3.
Install the main truss on axis C, E, H and K of
the competition hall 4. Install bracket trusses
between e-H axis, C-E axis and H-K axis of the
competition hall 5. Install the main truss on
axis D, F, E and J of the competition hall 6.
Install external supports for a-axis and K-axis
of the competition hall 7. Install roof support
between C axis and K axis of the competition
hall 8. Install the longitudinal main truss of
axis 6 of the training hall 9, roof secondary
structure and purlin installation 10.
Installation of roof maintenance structure
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?.Construction plan and process - support
installation

• The competition hall and training hall are
  equipped with slip-support seismic ball bearings
• 100, including 84 competition halls and 16
  training halls.
• Bearing embedment is completed, and seismic ball
  bearing is ready for the beginning
• Install, first according to the original axis
  control point and elevation control point
  alignment
• Field progress axis and elevation control points
  are then encrypted according to control
• Line measurement of the released axis and at
  least two elevation control points, and then
  measured
• The center cross of each support is marked on the
  buried surface
• On, according to the center line, draw the edge
  line of the support and install the adjusting pad
• The plate determines the position of the bottom
  elevation of the support. It will be supported by
  a 25 ton truck crane
• The seat is fixed by spot welding at the axis and
  elevation position of measurement and release.
• Retest the elevation axis of the support is
  correct, and weld the support bottom plate with
  the buried plate
• The strong. In order to control the welding
  deformation of the support, welding to take
• Symmetrical welding on both sides at the same
  time.
• Seismic ball bearing installation should pay
  attention to the support fixed, control
• Errors in the installation process do not occupy
  the Angle of the support.

Stadium truss
Aseismic ball bearings for competition halls
Training hall anti - seismic ball bearings
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?.Construction plan and flow - training hall
installation sequence
1. Install the transverse main truss of e-H axis
of the training hall
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?.Construction plan and flow - training hall
installation sequence
2?Install the longitudinal main truss of axis 1-5
of the training hall
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?.Construction plan and flow -- installation
sequence of competition hall
3. Install the main truss on axis C, E, H and K
of the competition hall
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?.Construction plan and flow -- installation
sequence of competition hall
4. Install bracket trusses between e-H axis, C-E
axis and H-K axis of the competition hall
5. Install the main truss on axis D, F, E and J
of the competition hall
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?.Construction plan and flow -- installation
sequence of competition hall
8. Install the longitudinal main truss of axis 6
of the training hall
6. Install external supports for a-axis and
K-axis of the competition hall
7. Install roof support between C axis and K axis
of the competition hall
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??Construction plan and process - training hall
installation
1General construction methods According to the
size, weight and deformation of the main truss,
as well as the requirements of the construction
period and other factors, the partial hoisting of
the training hall will adopt the construction
method of "ground assembling and overall hoisting
in place", and the construction method of
"sequential installation" is the original. Due to
the limited space for assembly, it is considered
to reduce turning over during assembly. Vertical
assembly frame is set on the ground of the truss
to complete the assembly of a single truss and
internode assembly, and then the whole truss is
hoisted into place by an 80-ton crane.
2. Hoisting of the main truss 1 Selection and
determination of crane In order to lift the truss
to the design elevation, it is necessary to
choose a reasonable lifting machinery. According
to the type of truss structure, lifting weight,
working radius, site conditions and other factors
(the local basement has a large area, which has
affected the hoisting and running of large
cranes), so an 80-ton truck crane is selected for
hoisting. 2 selection and determination of
lifting point and rigging The selection of
hanging point the hanging point of the sling
selection of the truss node, in the selection of
hanging point should meet the following
conditions the shaft force of the truss members,
especially the rod near the hanging point does
not exceed the allowable value, the maximum is
not more than the corresponding rod tensile
strength as the original The Angle between the
sling and the horizontal line should not be too
small, generally about 60 degrees. According to
the above requirements, the lifting point should
be set at the node. Combining with the
characteristics of the components, it is proposed
to adopt four-point help tie, and the lifting
center of gravity is in the same vertical line as
the center of gravity of the components.
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??Construction plan and process - training hall
installation

• 3 Placement and temporary fixation of trusses
• The single truss is first moved to the designated
  hoisting position, and then the single truss is
  hoisted to the designated hoisting position using
  an 80 ton truck crane
• Support on the site, at the same time in the
  middle of the lifting of the first main truss
  area arranged three wind rope, each
• The cable shall be equipped with a 3T reverse
  chain to find and balance. After the above
  facilities are completed, then release the crane
  80
• Hook.
• Measurement of verticality of truss
• The central surface of the truss should be
  perpendicular to the ground after installation.
  The measurement method is as follows
• Two theodolites were set up on the concrete
  platform directly below the truss. The trusses
  are in place and strengthened
• After that, the center line of the two supports
  is first measured to the ground as the
  observation baseline, respectively in the lower
  chord and the outer side of the lower chord
• Set up theodolite on the theoretical projection
  position line, observe vertically upward, check
  the offset of each chord edge, each chord
• Three points are selected for comparison and
  analysis, and the actual vertical deviation can
  be obtained by removing the factors of
  manufacturing error. In order to get the vertical
• After the offset, the air rope is used to adjust
  the local parts of the truss properly, and the
  purlin frame between the adjacent truss and the
  adjacent truss is installed
• They can be removed when they're done.

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?.Construction plan and process -- Competition
hall installation

• 1. Overview of construction methods
• According to the size, weight, deformation of the
  main truss structure and the requirements of the
  construction period, the partial hoisting of the
  competition hall will adopt the construction
  method of "ground assembling, sub-assembling unit
  hoisting and placing, and aerial secondary
  assembling and placing". The original
  construction method of "spreading installation
  from one side to the other side" is as follows.
  The assembly bracket is set in the span to
  complete the unit assembly and internode assembly
  of a single truss, and then the assembly unit is
  lifted to the design position through a 120-ton
  crane. Two rows of support points are arranged in
  the middle of the truss, which is divided into
  three sections and connected with the floor
  structure through spherical hinge supports.

2. Hoisting of the main truss 1 Selection and
determination of crane In order to lift the truss
to the design support, it is necessary to select
a reasonable crane. According to the type of
truss structure, lifting weight, Operation
radius, site and other factors, taking into
account the local lifting of the competition
hall, a 120-ton automobile crane is selected for
lifting. 2 selection and determination of
lifting point and rigging Selection of hanging
point the hanging point of the sling selects the
node of the truss, and the following conditions
should be met when selecting the hanging point
the rods of the truss The axial force of the
member, especially near the hanging point, shall
not exceed the allowable value, and the maximum
shall not exceed the tensile strength of the
corresponding member For the original so The
Angle between the sling and the horizontal line
should not be too small, generally about 60
degrees. According to the above requirements, the
lifting points at both ends are set Right next to
the node.
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?.Construction plan and process -- Competition
hall installation

• 3 Emplacement and temporary fixation of trusses
  A single trusses is first moved to the designated
  hoisting position, and then a 120-ton crane is
  used to move the single trusses
• The truss is hoisted to the support point, and
  two cable wind ropes are arranged in the middle
  area of the first main truss, each cable
• The rope shall be equipped with a 2T reverse
  chain progression to find and balance. After the
  above facilities are completed, the hook of the
  120-ton crane will be released.
• Measurement of verticality of truss
• Two theodolites were set up on the concrete
  platform directly below the truss. After the
  truss is in place and strengthened, the first two
• The center line of the support is inverted to the
  ground as the observation baseline, and the
  longitude and latitude are respectively set on
  the theoretical projection position line of the
  lower chord and the outer side of the lower chord
• Instrument, vertical upward observation, check
  the edge offset of each string, each string to
  extract 2 points for comparative analysis, remove
  the cause of production error
• The actual vertical deviation can be obtained.
  After the vertical offset is obtained, the cable
  and wind rope are used to adjust the local
  progress of the truss appropriately.
• Before the adjacent truss and purlin frame are
  installed, it can be removed.
• 5 Instructions for constructing hoisting this
  volume
• Check the strength and stability before lifting,
  and make the lifting point clear to prevent
  component deformation caused by uneven force
  Girder hoisting
• When in position, control the size value of
  levelness, verticality and camber in line with
  the design requirements and standards Main
  truss, support, etc
• After the component is installed in place, it
  should be corrected and fixed immediately to form
  a spatial stiffness unit. Must be done on the day
  of the assignment
• To make the installed structural components
  timely form a stable space system
• When lifting, adopt two point lifting method to
  advance lifting. The sling is tied to the node
  position of the upper string of the truss and
  hoisted by the crane at one time
• In place. The roof trusses are connected to the
  segmental interface of the trusses, and then
  fixed by the welder in the air
• Assembled and butted.

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??Main technical measures - 1. Pipe truss
assembly on site
The ground assembly of this project can be
roughly divided into two categories, one is the
vertical assembly of the plane truss section of
the training hall, the other is the assembly of
the spatial truss section. The form of steel
structural components and the on-site lifting
scheme of the competition hall adopt the
implementation method of flat and horizontal
assembly with small on-site units, and the upper
platform supports segmental node docking. The
steel structure component form and site lifting
scheme of the training hall adopt the
implementation method of vertical assembling.
Training hall vertical assembling tire frame
Horizontal tyre mounting in competition hall
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??Main technical measures - 2, large span truss
pre-arch

• The 8 trusses between axis 7 and 15 of the
  competition hall have a 70 mm arch. Four trusses
  between axis 1 and 7 of the training hall
• The maximum arch of the four trusses between axis
  D and J is 80 mm. The arch plane of each point of
  the trusses in the training hall is shown as
  follows
• Prearch in span is a measure to ensure that the
  truss roof does not bend down after installation.
  The arch of the components is usually done in the
  factory. Before assembling the truss section, the
  arch value of each node should be determined by
  accurate calculation. During the assembly
  process, the assembly should proceed according to
  the measurement and laying out, and the control
  of camber value should be guaranteed by
  reasonable welding sequence. In the field
  assembly, the main progress will be some arch
  value adjustment, can use the flame correction
  method to progress correction, so that it meets
  the requirements of deepening drawings.
• The original of pre-arch invert the bending
  value at the lifting structure segment as the
  pre-arch control value, the factory will cut the
  butt surface of the member into an Angle of the
  bevel, in the ground assembly and high assembly
  to achieve the member corner.

Camber value of trusses in training hall
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??Main technical measures - 3, large span truss
unloading

• Truss structure welding after the installation is
  complete, need to uninstall whole, progress of
  truss support bracket removal, truss to remove
  the temporary support, actually is the process of
  load transfer, because the stress of the
  construction stage and tectonic stress state
  eventually completely inconsistent, must through
  the calculation of construction, make feasible
  technical measures, to ensure that meet the
  requirements of a variety of conditions.
• The removal sequence and measures of temporary
  support according to the original unloading, the
  adjustable supporting device (column cap, jack)
  placed on the support will be repeated cycle
  trace descent to achieve load balance transfer,
  and the unloading sequence is "from the middle to
  the periphery, symmetric progress in the center".
  Removal from the center to both sides of the
  cycle progress, each time the displacement of the
  fall shall not exceed 50mm.
• In the unloading process, it is necessary to
  strictly control the control precision of each
  elevation during cyclic unloading, set up
  measurement control points, monitor the progress
  of the whole unloading process and implement
  information construction management according to
  the calculation results.

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??Main technical measures - 4, pipe truss factory
production
To ensure the structure forming, it is necessary
to optimize the design of welding profile,
assembly sequence and welding method. In order to
ensure the production accuracy, it is necessary
to do a lot of work on the cutting of
intersecting steel pipe line and tooling design.
Prediction error range, phased measurement
results, tracking monitoring. Feasibility of
transportation and site installation.
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??Main technical measures - site welding of 5
large span pipe trusses

• The rationality of welding process and welding
  quality are the key links to ensure the quality
  of the whole truss installation. Welding process
  symmetrical joints and symmetrical structures
  adopt omni-directional symmetric welding
  technology to minimize welding residual stress.
  Welding method mainly adopt CO2 gas body
  protection welding and manual arc welding welding
  method.
• Welding management for qualified welders to
  carry out internal examination, according to the
  examination results, grade and the importance of
  the weld matching.

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