(1) After the beam transport vehicle is parked in the beam yard, use two gantry cranes in the beam yard to lift the beam and move it above the beam transport vehicle. Protective measures should be taken for the hoisted beam body to prevent damage to the prefabricated components during hoisting.

(2) Method of loading and unloading box girders: Lift the box girders from the hoistway of the prefabrication yard and place them on the beam transport vehicle. The square timbers and rubber pads are laid at the bottom of the box girder, and straw mats are laid on the rubber pads to prevent pollution and damage to the bottom of the beam. Temporary supports are set on both sides of the web of the box girder to prevent the beam plate from tilting. After the box girder is transported to the site, it is directly hoisted and installed on the cap beam support by the bridge erecting machine, and the support and the connection between the beams should be done in a timely manner to ensure its stability.

(3) When the steel beam transport vehicle is transporting the box girder, there should be a guardian for inspection to prevent the loosening of the steel beam support and abnormal situations when going uphill or downhill. Place sleeper timbers in time to ensure the stability and safety of the steel beam transport vehicle.

(4) Treatment of the driving road of the beam transport vehicle:

① The width of the road surface should not be less than 8m. The road surface is filled with mountain soil with a thickness of 50cm. The turning radius should not be less than 40m. The longitudinal slope of the road should not be greater than 3%, and the transverse slope should not be greater than 2%.

② When the beam transport vehicle is driving on the bridge deck and needs to pass through the cast-in-place section, the reserved reinforcing bars of the cast-in-place section should be welded according to the specified requirements, and a 25mm-thick steel plate should be placed on top. The steel plate should be welded to the reserved reinforcing bars of the cast-in-place section to prevent the steel plate from slipping, so as to facilitate the safe passage of the beam transport vehicle.

③ When the beam transport vehicle passes through the bridge deck expansion joint, cover and protect the position of the expansion joint with geotextile or sacks to avoid debris falling into the joint. And use a movable gangplank made of a 25mm-thick steel plate to cover the expansion joint to facilitate the smooth passage of the beam transport vehicle.

(5) Before the beam body is lifted, the corresponding corners should be protected with special appliances processed from section steel or lined with rubber belts for protection. The beam body components should be bundled from the bottom to ensure that the box girder is horizontal, the force is uniform, firm, and the lifting speed should be uniform and stable.

(6) The lifting point position of the beam body should be as close as possible to the design support point position of the beam body under the condition of meeting the installation requirements, and reliable measures should be taken to ensure that the applied prestress does not generate a negative rotational moment, which will have an adverse impact on the beam body.

(7) Throughout the entire process of beam body installation, each work team should have a clear division of labor, and there should be a dedicated person in charge. During the operation process, except for the designated on-site commander, no one else is allowed to command the operation. Various gestures, flag signals, and whistle sounds for the unified installation work should not be changed casually.

(8) Construction operators must be trained in advance, have a clear understanding of the component installation procedures and operation procedures, and must hold a certificate to work.

(9) For the beam body hoisting operation, the construction should be stopped in adverse weather conditions such as when the wind speed is greater than 8m/s, the visibility is lower than 50m in foggy weather, and during rainfall. All lifting equipment should be inspected and test-run before each use to ensure safety and reliability. The electric hoist must have sufficient rainproof facilities during the rainy season.

(10) When lifting the beam, move the trolley to the tail of the bridge erecting machine and lift the beam. Let the front trolley and the other part move forward at the same time. Lift the beam. The front trolley can be moved under the rear trolley. The front and rear trolleys transport the beam to the bridge together. For the support, the longitudinal and transverse support axes are arranged on the cushion stone, the box girder is arranged corresponding to this axis, then the position of the cross diaphragm is adjusted moderately, the cross diaphragm is arranged, and then the box girder is in place. After the box girder is in place, both ends are supported with square timbers to stabilize the beam body. When the bridge erecting machine is perforating, the running track must be straight and parallel to the bridge erecting machine, and other perforating procedures are the same as above. When erecting the side beam on the circular curve transition curve according to the requirements of bridge erection, the position of the front and rear transverse movement guide rails or the position of the bridge erecting machine should be adjusted to ensure the smooth erection of the side beam. After the installation of the whole span is completed, each box girder can be connected and stabilized with each other.

(11) When installing the box girder, the construction should be carried out strictly in accordance with the requirements of the construction technicians, and no unauthorized operation is allowed. At the same time, the horizontal and vertical deviation dimensions must be within the specified requirements. After the box girder is installed in place, the lateral spacing between the beam and the wooden board varies. Some have a large spacing, and some have almost no gap, which will affect the beam (plate).

(12) After the beam body is erected, the longitudinal and transverse reinforcing bars of the beam body should be welded to ensure the stability of the beam body.

(13) After the beam is erected, protective measures should be taken in the two adjacent edge directions. On the outer side of each span of the erected beam, a longitudinal steel pipe with a diameter of Φ48mm and a length of 1.5m should be arranged at an interval of 2m. A skirting bar should be set 25cm from the bottom of the steel pipe, and steel pipes should be arranged at a transverse interval of 50cm. The connection between the steel pipes should be made with buckle connections, and a safety net should be hung on the inner side of the steel pipes.