Abstract: A double-sided sound device includes a frame, a first vibration system, a second vibration system, and a magnetic circuit system. The frame includes an upper end opening and a lower end opening, the first vibration system is disposed at the upper end opening of the frame, the second vibration system is disposed at the lower end opening of the frame, and the magnetic circuit system is disposed in the frame. The magnetic circuit system includes an outer magnetic yoke, a magnet portion, and a non-magnetically conductive connector. The outer magnetic yoke includes a side wall and a first flange portion. The magnet portion includes an upper pole core, a lower pole core, and a magnetic steel, and the magnetic steel is clamped between the upper pole core and the lower pole core. The double-sided sound device reduces a product size, and further reduces material costs.

Abstract: The present application provides a sounding device. The sounding device includes a front surface with a sound outlet hole; a back surface; a sounding component and an outer casing. The outer casing is covered outside the sounding component. A cavity is formed between the outer casing and the end of the sounding component close to the back side. A sound guiding channel is arranged in the outer casing. One end of the sound guiding channel is communicated with the sound outlet hole, and the other end of the sound guiding channel is communicated with the cavity. The sounding device of the present application provides a smooth transmission channel for the sound from the back side by arranging the sound guiding channel in the outer casing, thereby strengthening the frontal sound of the sounding device and greatly improving the loudness of the sounding device.

Abstract: Disclosed is a composite capping beam with a steel beam and an ultra-high-performance concrete plate. The composite capping beam includes a steel beam and an ultra-high-performance concrete (UHPC) plate, where the steel beam includes a bottom plate and web plates, the web plates are arranged at two sides of the bottom plate in a longitudinal bridge direction, bottoms of the web plates extend downwards to be provided with lower extension sections, and the UHPC plate is clamped in a cavity defined by the lower extension sections and the bottom plate. The present disclosure further provides a construction method for the composite capping beam with a steel beam and an ultra-high-performance concrete plate. The composite capping beam with a steel beam and an ultra-high-performance concrete plate according to the present disclosure is small in hoisting weight and economical.

Abstract: Disclosed are a composite box girder structure and a construction method therefor. The composite box girder structure includes a box enclosure and an inner core, where the inner core includes a thin-walled steel shell, shear connectors, and diaphragms, and the thin-walled steel shell is attached and fixed to an interior of the box enclosure by means of the shear connectors. In the present disclosure, the inner core and the box enclosure of the composite box girder structure jointly load force, such that effectiveness of the structure in resisting a use load can be improved. The inner core is directly used as an internal template of UHPC, such that rapid bridge construction can be achieved. Further, not only defects of conventional pouring can be overcome, but problems of excessive lateral local stress, overall stability, cross-section distortion and shear bearing capacity of web plates can be solved.

Abstract: Disclosed are a composite deck structure for a bridge, and a bridge structure and a construction method thereof. The composite deck structure includes a top plate (1), longitudinal ribs (2), and transverse ribs (3), where the longitudinal ribs (2) are fixedly connected to the transverse ribs (3), and are connected to the diaphragms (4) by means of the transverse ribs (3), and the transverse ribs (3) are not provided with cutouts for accommodating the longitudinal ribs (2). According to the composite deck structure, no cutout is provided on the diaphragms (4), and stress generated by the cutouts is reduced; hot-rolled section steel is used for longitudinal ribs (2) and transverse ribs (3) instead of welded steel plates, such that welding seams are reduced and fatigue resistance of the composite deck structure is improved.