The National Speed Skating Stadium is the only new ice competition venue for the Beijing Winter Olympics and one of the venues for the 2022 Winter Olympics.

The National Speed Skating Stadium is the only new ice competition venue for the Beijing Winter Olympics and one of the venues for the 2022 Winter Olympics. The large-span roof of the National Speed Skating Stadium is a saddle-shaped hyperboloid, using a two-way single-layer orthogonal cable net system, supported on the steel ring truss of the surrounding ring.

At the beginning of 2019, CABR successfully completed the construction of the speed skating hall roof cable net-the world's largest two-way single-layer orthogonal saddle-shaped cable net roof.

In July 2020, the Testing Institute of China Construction Research Institute undertook the four-character test of curtain wall roofing. This is the second time that the testing institute undertook the curtain wall of the speed skating hall after undertaking the physical performance test of the S-curve super-size special-shaped curtain wall of the National Speed Skating Hall in 2019. Four properties test of roofing. The four characteristics of the curtain wall roofing test is the national speed skating hall roof engineering unit roof panel. The keel is a C-shaped galvanized steel purlin. A panel composed of waterproof coiled material, thermal insulation glass wool and other materials is installed above the purlin, and includes an opening section.

The "four properties" of curtain wall roofing refer to airtightness, watertightness, wind pressure resistance, and interlayer deformation performance. The cabinet processing and testing are carried out in the laboratory workshop. In order to better fit the actual situation of the metal roof curtain wall, the test piece will be different from the ordinary curtain wall test piece and placed flat in the laboratory for testing. In order to facilitate the observation during construction and testing, a pressure-resistant box made of a 1.5-meter-high steel structure will be erected under the test piece, and each surface will be sealed on the steel structure to ensure the airtightness and airtightness of the box. Stress resistance.

The first difficulty in this four-sex test is that the newly-made box of the metal house interview part of the speed skating hall needs to be connected to the fans and sensors of the laboratory equipment, so the gas circuit of the original equipment will not be used. For this reason, the Testing Institute of CABR carried out the transformation of the airtight and wind pressure resistant pipelines on the test box. The air-tight pipeline and the anti-wind pressure pipeline of the conventional test equipment are separate two-pipe systems. The air-tightness detection and the anti-wind pressure detection correspond to different wind speed values. The method in which the air-pressure gas path is assembled into one gas path pipeline. In the layout of an anemometer in a pipeline, the test data and calibration data of the anemometer under different test items will be different. Therefore, it is necessary for the engineers of the inspection institute to adjust the corresponding wind speed value of the tachometer on the software side according to the actual situation, so as to eliminate the influence of the merger into a gas pipeline.

The second difficulty in the test is the transformation of the interlayer deformation detection deformation mechanism and the transformation of the actuator. The last test of the four properties of the metal roof curtain wall test is the interlayer deformation performance. The interlayer deformation performance of the curtain wall refers to when the main structure of the building occurs During repeated layer-to-layer displacement, the curtain wall maintains the ability of itself and the connection part of the main body without damage and dysfunction. In this test, because the metal roof curtain wall specimen will lay flat, it is very different from the traditional curtain wall interlayer deformation detection, and it is difficult to apply thrust to the other side while one side is fixed. The existing test equipment does not have the test conditions, so a new set of actuating mechanism is made to conduct interlayer deformation test on the metal roof curtain wall.

With the unremitting efforts of the engineers of the testing institute, the testing went very smoothly. The successful completion of the four-character test of the roof of the National Speed Skating Stadium demonstrates the high-tech position of the domestic building curtain wall inspection field of the China Construction Research Institute. At the same time, it further reflects that the China Construction Research Institute stands up to the difficulties when participating in the national key projects. Courage and determination. CABR will continue to uphold the tenet of "Science and Technology Innovation, Harmonious Development" and contribute the strength of state-owned enterprises to the development of the national construction industry!

This article is reproduced from: Beijing Institute of Construction Engineering