Risk analysis and control measures in the process of traverse

In the construction process of steel truss beam transverse movement, once a dangerous incident occurs, it is easy to cause casualties and bad social impact, so it is necessary to analyze the potential danger in the construction process before construction.It is not only necessary to ensure the safety of steel truss beam traverse construction, but also to avoid the influence of construction on the existing business line.Risk analysis and control measures in the process of steel truss beam traverse construction.

Before the formal construction, it is necessary to identify and evaluate the possible risks in the construction according to the adopted construction technical scheme, make correct evaluation and discrimination of the construction risks, and formulate control measures to actively control the construction risks to ensure the construction safety.Through the analysis of construction hazards and the adoption of corresponding measures to ensure the smooth completion of steel truss beam transverse construction and the normal operation of existing lines.

Hazard identification

Because of its special construction difficulties, the danger in the construction of steel truss bridge crossing the existing line needs to be identified by combining the site query and construction scheme.Before construction, the potential hazard sources in the construction process are screened by expert inquiry method, and the main potential hazards in the construction process are sorted and classified by classification and hierarchy.

Steel truss danger

Because of the characteristics of steel truss and construction technology, there are some potential dangers in the construction process.1) With the continuous transverse movement, the left and right sides of the steel truss may present the risk of unsynchronized traction, which may cause the steel truss to distort. Therefore, the traction equipment on the left and right sides must be adjusted at any time to ensure synchronous traction.2) In the process of transverse movement, if the effect of one side’s longitudinal limit device fails, which may lead to excessive longitudinal deviation of steel beam, longitudinal correction should be carried out in the process of transverse movement.3) In the process of beam falling, it may appear that the reaction force of a pier top is too large, which causes the local buckling of steel truss beam.When dropping the beam, ensure that the falling progress of each pier jack is consistent, and the construction personnel shall pay close attention to the deformation of the beam bottom.

Danger of existing line

Because of the particularity of the construction, the steel truss beam crossing the existing line will inevitably affect the operation line, so there are some potential dangers.1) During the construction of steel truss beam, sundries may fall on the existing line, resulting in serious consequences.The construction party shall install guardrails on both sides of the bridge deck before the steel truss beam enters the existing line to prevent debris from rolling down, and shall assign special personnel to clean up the debris on the bridge deck.2) The excessive deflection of the slipway beam in the steel truss beam traverse construction will affect the normal operation of the existing line.During the construction, the deflection of the slideway beam must be monitored in real time.3) During the construction of steel truss beam, the effect of train operation command signal may occur unintentionally, which may interfere with the normal operation of existing trains.Therefore, the relevant common sense of the construction personnel should be spread before construction to avoid the use of equipment that may cause interference.

Equipment hazard

There are various kinds of equipment used in the transverse construction of steel truss beam. The safety of construction equipment is the necessary condition to complete the transverse construction, so it is necessary to analyze the danger of all kinds of important construction equipment.1) As the most important temporary structure in the construction process, the construction platform must check the deformation and overall stability of the support under the most unfavorable conditions, and regularly observe the foundation settlement.2) The slideway beam is an important temporary structure of steel truss beam transverse movement, which should meet the planning requirements of strength, rigidity, stability, etc.The friction coefficient on the surface of the slideway beam should meet the requirements of traction planning, otherwise it may be difficult to traverse.The lubricant should be applied repeatedly before each stage of traverse operation.3) If the two oil pumps fail to be synchronized in construction, the same will result in large longitudinal deviation of steel truss beam.Before construction, the traction equipment shall be inspected in all aspects, and 2-3 times of trial traction shall be carried out to ensure the normal operation of the equipment before the formal traverse.In the process of traverse operation, a special person must be assigned to control the jack brake and report the current oil pressure in real time. The person in charge of traverse site shall control all information in the current construction at any time and issue further construction instructions.