Abstract: Provided are a protecting trolley and a construction method of rock burst prewarning protection system in non-contact tunnel construction. The protecting trolley includes a framework, a walking assembly, a rockfall buffering assembly, a spraying assembly and a rock burst prewarning system. The rockfall buffering assembly includes an arch frame in a fixed connection with the framework and a protecting net fixed on the arch frame. The spraying assembly includes a track car in connection with the rockfall buffering assembly and a spraying hose fixed on the track car, and the spraying hose sprays towards the surrounding rock. The rock burst prewarning assembly includes a thermosensitive infrared sensor used for detecting the temperature of the surrounding rock and a highly sensitive laser sensor used for detecting the deformation of the surrounding rock.

Abstract: An imaging assembly includes a first lens, a second lens, and a third lens. The imaging assembly satisfies the following relational expressions: 0.9<|f2/f|<2.4 and 0.23<?11/TTL<0.45. The illumination and projection apparatus includes the imaging assembly, a housing with a light inlet and a light outlet, and an illumination assembly disposed in a first accommodating space of the housing. The imaging assembly is clamped in a second accommodating space of the housing. The imaging assembly blocks the light outlet, and the illumination assembly blocks the light inlet, which improves sealing performance of the illumination and projection apparatus. An aperture of the second accommodating space is smaller than an aperture of a first accommodating space, which facilitates installation of the imaging assembly and the illumination assembly, and improves convenience of installing the illumination and projection apparatus.