What are the key points of safety card control for girder erection supervision?

The safety control of girder erection supervision is very important, and each key point is to better achieve the expected effect and ensure the construction safety and engineering quality. Zhong Da Consulting will introduce the key points of safety card control for girder erection supervision.

1. During the construction of prestressed concrete simply supported T-beam, the following main risk sources should be considered:

1 The girder erection equipment was not installed and used according to the operation procedures.

2 when lifting the beam, there are no supporting measures on both sides of the beam.

3 illegal operation when lifting the beam with a jack.

4 When two cranes hoist beams, the command is not uniform and the lifting is not synchronous.

5 when the beam body is stored, the pad is not firm.

6. Protective facilities are not set up in the girder erection work area according to regulations.

No safety protection facilities, such as hanging rails, treadboards and ladders, were set when the pier was mounted on the bench beam.

8 Before erecting the beam, do not press the line and reinforce the bridge head.

9. The beam line is not inspected and maintained as required.

10 bridge erecting machine failed to take reliable braking measures after the main engine was aligned.

1 1 There is no reliable anti-skid measures when the beam carrier puts the beam on the downhill slope.

Before the 12 bridge erecting machine goes through the hole, the beams are not connected horizontally as required.

13 there is no reliable working platform or hanging basket for transverse connection and wet joint construction.

14 workers working at high altitude do not wear labor protection articles as required; Work after drinking or fatigue.

15 There are no protective measures for crossing the road and river.

16 girder erection has no windproof measures; There are no lightning protection measures in rainy season construction; There are no anti-skid measures in winter construction.

2, supervision card control measures

1, T-beam and scaffold before construction, the supervisor shall review the special construction scheme prepared by the construction unit.

2, check the labor organization, whether meet the construction requirements.

3, check whether there is a technical disclosure, work instructions.

4, check the pre-job technical disclosure training records, should have the signature of the participants.

5. Check the qualification certificates of operators in key positions.

6, check all kinds of mechanical equipment, instruments, certificates and verification and calibration documents. According to the national regulations, bridge erecting machines, girder transporting vehicles and girder lifting machines must be certified by the national technical supervision department and accepted by relevant departments before they can be put into use.

7. Check the site records of transportation, assembly, debugging and test of bridge erecting machine. Witness the process of no-load and heavy-load test as much as possible. Witness whether the safety, reliability and stability of the bridge erecting machine meet the requirements. Witness whether the labor organization, command mode and contact information are suitable for beam erection.

8, check the preventive safety measures and emergency plan.

9, check the environmental protection and civilized construction measures.

10, beam specifications and beam quality must meet the design requirements. When hoisting the beam, the supervision engineer should carefully check the certificate of finished beam, check the appearance of beam, the thickness and adhesive force of waterproof layer at beam end, the length and quantity of beam; Check whether there is hollowing on the embedded plate of the beam support. If there is an empty drum, it should be handled according to the approved treatment measures, and it can only be played if it is qualified; Check the submission form of beam-making yard and beam-making unit.

1 1. When the beam carrier transports the beam, there should be a special person in front of the beam carrier to observe the road conditions on both sides. If abnormal changes are found in the road surface, stop immediately for inspection, and take emergency measures when necessary to ensure the safety of beam transportation.

12, after the bridge is lifted, no one is allowed to stay under the beam. Do not perform other operations on the beam that is moving or taking off and landing.

13, check whether the transportation route meets the safety requirements.

14, when the beam falls, the dynamometer jack should be used as the temporary fulcrum, and the difference between the reaction force of each fulcrum and the average reaction force of the four fulcrums must be checked on site within 5%.

15, grouting raw materials, mixture ratio, setting time and strength should meet the design requirements. It can only be used after on-site sampling and testing by a qualified laboratory is qualified. The site supervision engineer shall check the test report. If finished products and materials approved by the state are used, samples must also be taken.

16, check the test records of specimens under the same conditions when falling beams, and dismantle the temporary jack only when the strength of grouting material between the top surface of bearing cushion stone and the base is confirmed to be greater than 20Mpa. Before the temporary jack is removed, the bridge erecting machine shall not pass through the hole.

17, after the completion of beam erection, observe and measure the uniformity of beam joints in time, and observe whether the beam is stable and damaged. Check the measurement records of the construction unit.

18, supervise and inspect the implementation of safety and quality measures for girder erection in low temperature and stormy weather in winter, and make records.

19, the stay place of bridge erecting machine should be supervised. It is forbidden for non-working personnel to approach and walk on the bridge erecting machine, and it is forbidden for non-operating personnel to enter the control room. Anti-skid measures should be taken when the bridge erecting machine stays.

20. When erecting beams, protective personnel should be set up on the construction site to discourage onlookers from avoiding to a safe distance, and non-operating personnel are prohibited from entering the operation site on the bridge.

2 1, there should be enough lighting equipment for night operation, and the workers on the dock should use 36V safe voltage lamps.

22, the power switch should be locked, equipped with waterproof and moisture-proof measures, and should appoint someone to switch.

23, rigger, electrician, welder and other special industry operators must meet the relevant requirements.

24. Dock operators should wear safety helmets, non-slip shoes and fasten their seat belts. When necessary, a safety net should be hung on the pier.

25. When the measured wind power on the construction site reaches level 6 or above, the beam erection operation should be stopped. When the wind power reaches level 6 and there are bad weather such as moderate rain and snow, the beam erection operation shall not be carried out. After stopping girder erection, measures should be taken in time to protect transportation and girder erection equipment.

26. When girder erection equipment stays or girders are erected, effective measures such as anti-skid, fire prevention, anti-theft, anti-freezing and anti-skid should be taken.

27. Anti-skid measures should be taken in case of ice and snow or slippery road surface. Slow down properly when driving on a ramp.

28, bridge erecting machine, pier and beam-making operators should set up escalators up and down, and it is forbidden for operators to use hooks up and down.

29, scaffolding and strapping material should be checked, confirm the quality qualified rear can use.

30. The girder erection equipment shall have the functions of self-locking, interlocking and interlocking, and shall be put into trial operation before girder erection. Operators of transportation and girder erection equipment must undergo special technical training, pass the examination and obtain the operation certificate before they can take up their posts with certificates. Operators should fully grasp the structure, principle, performance, other technical parameters and safety operation procedures of transportation and erection equipment.

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