Huangpu Sports Center

Brief introduction of steel structure construction scheme for roof of Huangpu Sports Center 黄埔体育中心屋盖钢构造施工方案简介黄埔体育中心屋盖钢构造施工方案简介主要从以下方面：工程概况钢构造简介施工难点重点施工方案及流程主要技术措施

Mainly from the following aspects: • Project summary • Introduction to steel structure • Construction difficulties and key points • Construction plan and process • Main technical measures

一. 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 40m*50m, 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.

一. 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 1800×4500 rectangular round steel tube truss. The upper chord is φ426×11, the lower chord is φ402×10, the belly is φ159×5, φ180×6, and the support is φ203×6.5. 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: □ 400×400×24, the belly rod □ 250×250×8, 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

二、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.

二、 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

三、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

三、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.-

三、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.

四．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.

四．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

四、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.

四．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

四．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

四．Construction plan and flow - training hall installation sequence 1. Install the transverse main trussof e-H axis of the training hall;

四．Construction plan and flow - training hall installation sequence 2、Install the longitudinal main truss of axis 1-5 of the training hall;

四．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;

四．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;

四．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;

四、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.

四、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.

四．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.

四．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.

五、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

五、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

五、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.

五、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.

五、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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Huangpu Sports Center