GB/T 20051-2025Specifications of amusement rides for flying trapeze (English PDF)

3.1 Flying trapeze

A large amusement ride that uses a lifting device to elevate (lower) passengers (the passenger- carrying device) to a certain height via steel cables or other ropes. Relying on their own potential energy, they swing back and forth around a suspension point, and the suspension structure is flexible.

NOTE 1.the main structural type of the flying trapeze refers to the type of lifting beam and suspension structure.

NOTE 2.a typical structural diagram of the flying trapeze is shown in Figure 1.

NOTE 3.large amusement rides without a lifting device, where passengers ride directly on a platform at a certain height and swing back and forth around a suspension point, and whose suspension structure is flexible, can also be considered flying trapezes.

3.2 Lifting device

A device that lifts (lowers) the suspension structure and passenger-carrying device to a certain height.

3.3 Separating device

A device that separates the lifting device from the passenger-carrying device.

4.1 Basic Requirements

4.1.1 In addition to meeting the requirements of this document, the flying trapeze shall also meet the requirements of GB 8408.

4.1.2 The number of people carried by a single suspension structure of the flying trapeze shall not exceed 3.

4.1.3 The maximum unilateral swing angle of the flying trapeze shall not exceed 90°.

4.1.4 A risk assessment for the flying trapeze shall be conducted in accordance with GB/T 34371 and GB/T 39043 during the design phase, and a risk assessment report shall be issued.

4.1.5 The operating organization or the design client shall provide written data on the geological, seismic, meteorological, and power supply conditions of the flying trapeze installation site.

4.1.6 The design and construction of the foundation or building (structure) shall be entrusted to organizations with corresponding qualifications and comply with relevant civil engineering or building (structure) design codes.

4.2 Loads and Calculations

4.2.1 Loads and Operating condition analysis

4.2.1.1 The live load value for the flying trapeze shall not be lower than the maximum permissible passenger load value.

4.2.1.2 When calculating the ultimate wind load, a wind load with a 50-year recurrence interval for the location of use shall be selected. For coastal cities (see HY/T 094) and areas with an altitude exceeding 1,000 m, a wind load with a 100-year recurrence interval shall be selected.

The wind load values shall comply with the provisions of GB 50009.

4.2.1.3 During design, the seismic load value shall comply with the provisions of GB/T 50011.

4.2.1.4 During design, icing load calculation shall be performed, and the load values shall comply with the provisions of GB 50135.

4.2.1.5 Under separation conditions, the impact coefficient selected for the lifting towers

(frames) and separating devices shall not be less than 1.5.

4.2.1.6 The operating conditions of the flying trapeze include normal operating conditions,

abnormal operating conditions, and extreme state conditions. Normal operating conditions include lifting, separation, swinging, and maximum overturning moment, etc., and with consideration of no-load, eccentric load, and full load. Abnormal operating conditions include at least emergency stop, emergency rescue, and maintenance, etc. Extreme state conditions include at least ultimate wind speed, earthquake, and icing, etc.

4.2.1.7 Based on different operating condition analyses, the permanent loads borne by the flying trapeze structure shall be combined with other loads. Examples of combinations are shown in

4.2.2 Calculations

4.2.2.1 The design calculations for the flying trapeze include static strength calculations, fatigue

strength calculations, stiffness calculations, stability calculations, and anti-overturning calculations, etc., which shall be selected in accordance with the specific structure and operating conditions.

4.2.2.2 At least static strength and fatigue strength calculations shall be performed on the lifting beams, suspension structures, passenger-carrying devices, and lifting towers (frames).

4.2.2.3 At least the rigid lifting beams and lifting towers (frames) shall undergo stiffness calculations. Under normal operating conditions, the ratio of the maximum deformation of a rigid lifting beam to its maximum dimensions shall be less than 1/150, and the ratio of the maximum deformation of a lifting tower (frame) to its maximum dimensions shall be less than 1/75.

4.2.2.4 The safety factor for flexible lifting beam, suspension structure, lifting device, and anti- collision wire ropes or other ropes shall not be less than 5.

4.2.2.5 The stability calculations for rigid lifting beams and lifting towers (frames) shall comply with the requirements of GB 50017.

4.2.2.6 Mobile flying trapezes shall undergo anti-overturning and anti-sideslip calculations,

which shall be performed in accordance with GB 8408, with a safety factor not less than 2.

4.3 Structure

4.3.1 Lifting beams and lifting towers (frames) should preferably be rigid structures. Flexible

lifting beams shall use no fewer than two wire ropes. Failure of any one rope shall not pose a hazard of falling, and the ropes shall be detectable and maintainable.

4.3.2 The suspension structures shall use no fewer than two wire ropes or other ropes, arranged at a certain angle along the vertical plane of the swing direction.

4.3.3 A safety device shall be installed between the passenger-carrying device and the lifting beam to prevent failure of the suspension structure.

4.3.4 The flying trapeze shall be equipped with anti-collision devices to prevent collisions

between the separating device and the lifting tower (frame).

4.3.5 The connecting shaft between the flying trapeze lifting beam and the suspension structure shall be designed for unlimited service life.

4.3.6 The flying trapeze shall be equipped with devices to prevent the lifting wire rope from detaching from the pulley and devices to prevent over-winding of the lifting wire rope. The end of the lifting wire rope shall have at least three turns of margin on the drum.

4.3.7 The wire ropes used for flexible lifting beams, suspension structures, lifting devices and ......