Highway Concrete 200t Bridge Steel Erection Launcher Crane

Basic structure and working principle of road bridge machine

The main structure of EJQJ150 bridging machine is shown in the figure, mainly consisting of main beam, beam, front and rear middle legs, middle and rear top high legs, side beam hanger, lifting balance, middle beam, operation room, hydraulic and electrical control. System and other components.

3.1 The main beam bridge machine has two main beams. The length of the main beam is designed according to the erection of 50m span. Each main beam is assembled by 8 sections and 10m long sections through the pin. The main beam adopts an "A"-shaped section, the section size is 2.8X1. 5m; the center distance of the two main beams is 5m, and the clearance is 3.5m; the main beam is divided into five types of beam sections. Each main beam is composed of upper and lower chords, webs, bottom joints, gussets and other components, all of which are welded with 16MN plates.

      3.2 Horizontal contact of the main beam To ensure the stability and lateral stiffness of the main beam when traversing, three horizontal connections, front cross-link, rear cross-link and temporary diagonal support are set between the two main beams; Each of the cross-links, three temporary bracing; all adopt the convenient pin-and-pin connection.

      3.3 Temporary diagonal braces are only connected when the bridge machine is idling forward to increase the lateral stability of the main beam, but must be removed when the frame is installed. For the convenience of operation, the temporary bracing is designed to be obliquely arranged with the main raft, and removed. Only the lower end of the diagonal bracing is removed, and then it is attached to the main girder bar. The diagonal bracing adopts φ 60 seamless steel pipe, the end welded joint structure, and the connecting lug is arranged on the upper and lower strings of the main jaw, and all are connected by pin. . .

      3.4 Front leg The front leg is composed of a cross section of the front leg, a main sill chassis, an outer support frame, an inner support frame, a diagonal support, a column, a cylinder, and a walking trolley.

      3.5 Middle leg consists of base, lateral distribution 粱, middle beam rotating device, flat car turning device flat roof distribution beam, flat car and connecting pin shaft.

      The 3.6 middle 粱 consists of a main beam, a connecting plate, a stiffener, a slide plate and a connecting bolt. 3.7 After walking, the legs consist of a longitudinal distribution beam, a lateral distribution beam, a support column, a rotating device, a coupling bolt, a walking flat car, and an ear plate and pin shaft connected to the flat car.

      3.8 top lift legs The main function is to lift the main beam to achieve various performances of the bridge machine. The steering of the middle and rear flat cars was completed by jacking up the main mast. The jacking leg is composed of a jacking jack and a jacking cylinder. The front jacking leg and the front walking leg are combined into one. The structure of the rear jacking leg is composed of a cylinder and a supporting column, and the upper end and the main beam are provided with a winding bolt. Connected, the lower end acts directly on the bridge deck.

      3.9 lifting crane consists of two main hoisting and lifting systems. The lifting system comprises a platform frame, a winch, a pulley block, a distribution beam, a wire rope and a pin shaft.

      3.10 side beam pylon side beam pylon The side beam can be directly installed in place. Firstly, the crane is used to lift the beam to the position of the middle beam, and then the side beam is lifted by the side beam hanger. The whole machine carries the beam and moves it in position to complete the installation of the side beam.

      3.11 Function The bridge erecting machine is suitable for all kinds of curved bridge construction. It can be carried out in single frame or double frame at the same time. The length of the main beam can be lengthened or shortened according to the actual span of different projects to adapt to 20~50 meters. The construction of various span bridges is flexible.

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