Walking into the Xi’an Olympic Sports Center to Explore the High-quality “14th National Games of China”

Whether it’s the successive arrival of international sporting events or the nationwide promotion of fitness, it signifies that we are stepping into an era of becoming a sports power. With the conclusion of the Tokyo Olympics, the flame of the 14th National Games of China is about to be ignited at the Xi’an Olympic Sports Center! This is the first time the National Games of China will be held in the western area, and it’s also the largest national sports event held in Xi’an since 1949. “Both the nation and the world will witness the brilliance of this grand event together. With plans in motion, we are ready to unleash our potential.

Xi'an Olympic Sports Center

01 Explore ”Chang'an Flower“—Xi'an Olympic Sports Center

The Xi’an Olympic Sports Center is located in the core area of the Xi’an International Port District, positioned at the heart of the central landscape axis running east to west. It is bordered by the Bahe River to the west and overlooks the Li Mountain to the east, setting nestled amidst mountains and water. From an aerial perspective, the Xi’an Olympic Sports Center Stadium, with a building area of approximately 156,000 square meters, resembles a gigantic “pomegranate flower” composed of 28 petals. Its overall design concept draws inspiration from the historical context of the Silk Road and Xi’an’s city flower, the pomegranate flower, symbolizing “the Silk Road embarking, flourishing times ahead.”

The “petals” serve as the roof canopy of the stadium, utilizing 14 pairs totaling 28 “petal” units to form the abstract form of a flower. It is worth mentioning that the structure of the Xi’an Olympic Sports Center Stadium is intricate, with the aforementioned 28 “petals” featuring seven different shapes. Some roof sections have height differences of up to 10 meters, totaling 6020 irregularly shaped pieces. The lower part of the “petals” is supported by seven groups of V-shaped concrete columns, totaling 28, which, coupled with the lightweight and delicate appearance of the shaped aluminum panels, and the rugged simplicity of the V-shaped columns, create a visual contrast in the architectural design, expressing both the strength and beauty of the building and seamlessly integrating Xi’an’s historical heritage with modern sports architecture.

Venue of Xi'an Olympic Sports Center

The Xi’an Olympic Sports Center not only boasts a magnificent exterior beauty but also offers a versatile main stadium. The main stadium includes a standard 400m comprehensive athletics track with nine circular lanes and ten straight lanes, including an international standard football field. The warm-up area includes a standard 400m comprehensive athletics track with eight circular lanes and nine straight lanes. The track surface material is made of world-class prefabricated rubber, making it the first sports venue in northwest China to receive both the World Athletics Class 1 Track Certification and the Chinese Athletics Association Class 1 Track Certification (dual certification). The venue is equipped with comprehensive facilities, suitable for hosting major sports events such as athletics and football, as well as large-scale concerts, celebrations, and other events. It serves as a large-scale public service facility that integrates functions such as sports, leisure, gatherings, sightseeing, and entertainment.

As the main venue for the 14th National Games of China, the Xi’an Olympic Sports Center undertakes the important tasks of hosting the opening ceremony and athletics competitions. The stadium utilizes prefabricated rubber rolls with excellent durability and environmental friendliness. As a professional rubber facility manufacturer, we, Huadong Track, also produce durable and environmentally friendly high-quality prefabricated rubber rolls. We have supplied rubber facilities for major sports events such as the Sochi Winter Olympics and the Incheon Asian Games, contributing to the successful hosting of these large-scale sports events.

02 The Construction Process of the Prefabricated Rubber Track at the Xi'an Olympic Sports Center

2.1 Site Cleaning and Rectification

In order to ensure that the quality of the track fully meets the certification standards of the World Athletics Class 1 Track and the Chinese Athletics Association Class 1 Track, and to fully guarantee the adhesion of the adhesive and the smoothness of the prefabricated rubber track, thorough cleaning of the base surface and rectification of any quality defect of the base surface must be carried out upon arrival on site.

2.1.1 Site Cleaning:

  1. Oil Stains: Use specialized cleaning agents to remove them. For areas heavily contaminated with engine oil, excavate and repair.
  2. Dust and Dirt: Sweep clean with a broom and then use a blower to remove any remaining debris.
  3. Firm Protrusions: Use a shovel to remove and clean them.
  4. Mud: Wash away with a high-pressure water hose.
  5. Debris around the Track: Shake trees or plants to accelerate leaf shedding and remove them in advance. Ensure that there is minimal wind blowing debris around the track. Close off the construction site to reduce the entry and exit of vehicles and pedestrians as much as possible.

2.1.2 Rectification:

  1. Conduct a comprehensive inspection and measurement, check the positioning, and test the strength, density, and smoothness of the base surface. Identify areas that do not meet the technical requirements of World Athletics and mark them for rectification and repair in the subsequent steps.
  2. According to the measured elevated data, use professional equipment and suitable materials to grind high points and fill low points on the asphalt concrete surface base. Repeat the leveling process through water testing until satisfactory results are achieved. After water testing, mark the areas where water accumulates, indicating depressions in the base layer.
  3. Inspect and measure or rectify and repair the installed sports facilities and embedded components related to the ground.
  4. Check the drainage system of the site and rectify and repair any parts that do not meet the relevant technical requirements.

2.2 Fundamental retest of the prefabricated track before installation

According to relevant specifications and standards, measurements, positioning, and quality acceptance are conducted on the track foundation after rectification and completion.

2.2.1 Basic Flatness Inspection

Using the dividing line between the straight and curved sections of the track as a reference, mark points every 3 meters along both the transverse and longitudinal directions for the straight sections. For the curved sections, use the center point of the curve as the center and radiate lines every 5 degrees using a theodolite or total station. Mark points every 3 meters along the curve. Place a 3-meter straightedge lightly between any two adjacent points and use a feeler gauge to measure the maximum local recess gap. Conduct measurements at 30 points in each group and record them on the site plan. The requirement for flatness is that the number of qualified points (feeler gauge reading ≤ 3mm) should be above 95%.

2.2.2 Basic Slope Inspection

Starting from the dividing line of the track, mark points every 10 meters along the straight sections, and for the curved sections, mark points every 15 degrees using the center point of the curve. Each group of points includes two points, one on the inner edge and one on the outer edge of the first and ninth lanes, as well as points on the two semicircles and the auxiliary area. Measure the elevation of each point using a leveling instrument and calculate the height difference between the two points in each group and between adjacent points on the same lane of the first and ninth lanes. The requirement for the basic slope of the track foundation is ≤1% horizontally, ≤1‰ vertically, ≤4‰ for the two semicircles, and ≤5‰ for the auxiliary area.

2.2.3 Repeat Measurement of Key Points

Use a total station (2″ level) to measure the accuracy of the two centers and the radiating lines passing through the centers in relation to the relevant points on the first and ninth lanes. If any errors are found, they should be promptly recorded, reported, and adjusted accordingly.

2.2.4 Acceptance of Base Layer Quality

The track foundation should be free of obvious cracks, with a uniformly firm surface, no loose aggregate, smooth and seamless joints, clear and well-defined edges, and no defects. There should be no significant pooling or wave-like phenomena after watering or heavy rain. The curing period for the foundation should be at least 21 days.

2.3 Construction Preparation

2.3.1 Layout Preparation for Construction Operations:

Determine the positions of water and power sources and connect them according to specifications to ensure safety. Identify material access routes and storage areas. Set up a flat, solid, and dry surface for the mixing workbench of adhesives and implement pollution prevention measures.

2.3.2 Preparation of Construction Tools:

Inspect the performance of tools and mixing and transportation machinery, and conduct a trial run to simulate operations according to the actual project conditions. Optimize material transportation distances as much as possible and determine the construction sequence based on proximity.

2.3.3 Inventory of Raw Materials:

Calculate the daily requirements for rolls of sheeting and adhesives based on actual measured areas.

2.3.4 Pre-positioning Before Installation:

For accurate sheeting installation, professional measurement technicians must accurately position the athletic track before installation and adhere to the designated marker lines. Equipment required: one total station (with a precision of 2″ or higher), two 100m high-precision steel tape measures (one spare), several marking pens, and line markers. Key points determination: Identify and mark the four intersecting points at the intersection of the two center points and the straight and curved sections. Mark out nine circular tracks on the asphalt surface according to the standard track lines for a 400m athletic track, with 9 on the east straight section and 10 on the west straight section. The marking line should be at the midpoint of the original width line, representing the future boundary overlap line for each roll of sheeting. Mark out the positions for long jump, triple jump, high jump, pole vault, shot put, discus throw, hammer throw, javelin throw, and 3000m steeplechase according to the design drawings and the requirements for a standard 400m athletic track. After all project marker lines are marked, re-measure and inspect for accuracy.

2.3.5 Sheet Installation:

After thorough preparation, assess the current and upcoming weather trends and determine if the ground moisture content is ≤5%. With permission from the supervising engineer, proceed with the sheeting installation process.

2.3.6 Installation of Main Track Sheet:

Installation Sequence: Straight sections before curves, from far to near, from inside to outside, and closing positions are the exit points. Confirm the area and scope to be completed for the day. Use specialized transport vehicles to transport rolls of sheeting to the installation site, unroll them, and let them unfold to a basic straight position. Check the edges of the sheeting for any damage. Align the sheeting with the predetermined positions on the ground (starting from the first lane) for trial installation. Repeat the trial installation process for the sheeting to be installed that day. Cut the sheeting neatly at the joints between two rolls. After the trial installation of the sheeting is completed, roll it back up according to the marker lines. Apply the pre-mixed PU adhesive onto the asphalt base using a special notched trowel or scraper (the thickness of the adhesive should be moderate and uniform, without being too thick or too thin, or omitted. The PU adhesive usage per square meter is 1.5kg-1.7kg). Install the rubber sheeting according to the designated construction area and press bricks over the joints to ensure they are straight while continuously pressing and smoothing the joints.

2.3.7 Line Painting:

After the sheeting installation is complete, mark out and paint the lines for the entire track.

  1. Material: Elastic polyurethane marking paint.
    Material characteristics: Wear-resistant, colorfast, strong adhesion.
  2. Use a verified steel ruler and total station to set the position lines. The data for each position should comply with the requirements of athletic technology, with an internal control relative error of ±0 to ±1/10000.
  3. Strictly follow the standard line drawing specified in the World Athletics Association’s Athletics Facilities Manual and pay attention to color separation requirements.

03  High-quality Xi'an Olympic Sports Center

  1. The prefabricated rubber surface layer has excellent elasticity and slip resistance, ensuring rapid drainage even in rainy conditions and maintaining surface traction.
  2. The unique secondary vulcanization integrated synthesis process seamlessly connects the surface rubber with the bottom three-dimensional mesh structure rubber, greatly enhancing the overall system’s elasticity response and durability.
  3. The air chamber structure at the bottom of the rubber track forms a special bowstring effect, compressing and storing the energy of athletes stepping onto the track and rebounding to propel the body forward, which helps athletes achieve good results to some extent.
  4. The rubber track at the Xi’an Olympic Sports Center maximizes safety and environmental performance.
  5. The track lines at the main stadium of the Xi’an Olympic Sports Center are constructed by professional certified line painters recognized by the Chinese Athletics Association. According to relevant specifications and the requirements of the International Association of Athletics Federations (IAAF), 10 lanes are delineated for the straight section of the main competition area and 9 lanes for the curved section, with each lane strictly controlled to a width of 1.22 meters.

04 Chinese Athletics Association Venue Acceptance Review Comments

After rigorous and professional testing and acceptance by the expert team from the Chinese Athletics Association, the Xi’an Olympic Sports Center main stadium received the following acceptance evaluation: “After on-site testing by the expert group of the Chinese Athletics Association on the thickness, flatness, point lines, and sports technology of the main field, the thickness qualification rate of the field is 99.5%, and the flatness qualification rate is 99.1%. The prefabricated surface layer of the main field has consistent color, firm bonding, no delamination or bubbling, accurate point lines, and consistent and clear line width, meeting the requirements of various competitions. No odor was detected on-site. It complies with the requirements for acceptance of Class I fields.”

The field acceptance certificate is valid for 5 years, which is the period recognized by the Chinese Athletics Association for competitive results. It does not represent the lifespan of the field. After the certificate expires, it can be re-applied for acceptance and the validity period extended.

Class 1 Athletics Facility Certificate
Class 1 Athletics Facility Certificate

05 Inspirations to A Rubber Track Manufacturer

The construction process of the prefabricated rubber track at the Xi’an Olympic Sports Center has brought many inspirations to us rubber track providers:

  1. The Importance of Quality and Technical Standards: Sports venue construction has strict requirements for quality and technical standards. Providers need to adhere to high standards of quality control and technological innovation to ensure that products meet relevant standards and requirements.
  2. Emphasis on Environmental Protection and Safety Performance: Environmental protection and safety performance are important considerations in sports venue construction. Providers should focus on the environmental performance of products to avoid negative environmental impacts and ensure that products provide safety guarantees during use.
  3. Responsiveness to Customization Needs: Different sports venues may have different requirements, so providers need to have a certain degree of customization capability to tailor products and provide personalized services according to specific customer needs.
  4. Continuous Innovation and Technological Improvement: Technology in the field of sports venue construction is constantly evolving, and providers need to continuously innovate and improve technology to meet market demand and maintain competitiveness.
  5. The Importance of Collaboration and Communication: Sports venue construction is a complex process involving multiple parties. Providers need to maintain close collaboration and communication with designers, builders, supervisory units, and other stakeholders to ensure that projects proceed smoothly and achieve the expected results.

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