1. Safety operating procedures for bridge erecting machines
1. The specified height requirements on both sides of the longitudinal running track of the bridge erecting machine should correspond to the level and maintain stability. The transverse running tracks of the front, middle and rear outriggers must be horizontal, and the spacing must be strictly controlled. The three tracks must be parallel.
2. When installing the concrete beams of skew bridges, the position of the front, middle and rear outrigger traveling wheels of the bridge erecting machine should be staggered forward and backward. The spacing can be calculated based on the skew angle to facilitate the outrigger wheels. Can run on the same horizontal track (please contact the manufacturer for specific details).
3. All preparations must be made for the longitudinal movement of the bridge erecting machine. It is required to be in place at one time and no pauses are allowed.
4. When the crane of the bridge erecting machine carries the concrete beam to run longitudinally, the front leg position requires a hand chain hoist (5t) to be tightened with the traversing track. Fixed to enhance stability.
5. When installing a bridge with an up and down slope, measures must be taken to prevent the bridge erecting machine from sliding when it is displaced longitudinally. For example: Use triangular iron blocks to protect the front and rear wheels, especially the middle leg is very close to the end of the beam. Pay attention to control when shifting.
6. After the bridge erecting machine is assembled, it must be hoisted and tested. You can also use the concrete beam to test hoist, and then the bridge erecting machine is in place to start the installation operation.
7. When installing the bridge erecting machine, you must always pay attention to safety inspections. A comprehensive safety inspection must be conducted for each installation hole. If any problems are found, work must be stopped and dealt with in a timely manner before the operation can continue. Mechanical and electrical faults are not allowed to work.
8. Overload operation is not allowed during installation operations, and diagonal lifting operations are not allowed.
9. The processing material of the connecting pin must be in accordance with the requirements of the design drawings, and shall not be replaced by low-grade steel processing.
10. It is strictly prohibited to operate in winds above Level 5. The bridge erecting machine and the crane must be stabilized with rigging. When the bridge erecting machine stops working, the power supply must be cut off to prevent accidents.
11. The longitudinal positioning of the bridge erecting machine must strictly control the position and size to ensure the smooth installation of the concrete precast beams.
12. Since the bridge erecting machine is a large-scale special equipment for bridge installation, the work of the bridge erecting machine must be clearly divided and commanded uniformly. It must have full-time operators, full-time electricians and full-time safety inspectors. Strict construction organization and measures must be in place to ensure construction safety. The basic requirements for personnel are as follows:
Commander1Name: Familiar with the basic requirements of bridge structure and lifting work. First of all, be familiar with the structure, assembly procedures, operating methods and requirements in the instruction manual of the bridge erecting machine, and have certain organizational skills, be familiar with command signals, and have a strong sense of responsibility.
An electrician: one who can understand the circuit diagram of the bridge erection machine and wire the wiring according to the diagram, can quickly troubleshoot at work, has a strong sense of responsibility, is proficient in business, and has quick responses to assume and be responsible for the erection work. Operation of the bridge machine.
Hydraulic worker1Name: Familiar with the basic knowledge and usage and maintenance skills of hydraulic systems, and be able to operate them correctly and troubleshoot related faults.
Crane worker3Name: Has many years of experience in lifting work, has a strong sense of responsibility, has certain knowledge of mechanics, and is familiar with crane operating procedures and Safety regulations, work seriously, responsibly and meticulously.
Auxiliary workers 3Name: Young people with certain cultural knowledge, strong body, able to endure hardships, and willing to study business, and as a training Object usage.
13. When the cantilever moves longitudinally, the upper two-day carriage must retreat. The front overhead carriage retreats to the rear outrigger; the rear overhead carriage retreats to the middle of the rear outrigger and the rear high-rise outrigger.
14. When the middle roof is high and the outriggers are high, the front crane must retreat to the front outrigger; the rear crane must retreat to the rear outrigger.
15. When the front outrigger or the rear outrigger is raised, the vehicle must retreat to near the middle leg for two days.
16. After the front outriggers are lifted into place, special clamps must be used to lock the jacking stroke section to prevent the jack from being stressed for a long time.
17. Hydraulic system
(1) Two ball-type stop valves on the same hydraulic cylinder must be closed or opened at the same time. You must not open only one of them. And close the other one, otherwise it will cause an accident or even cause the hose to burst or the hydraulic cylinder to be damaged.
(2)Determine the setting value of the relief valve according to the different working conditions of the front, middle and rear legs and the suspension beam jack. , but the maximum shall not exceed 31MPa. Use the nut to lock it after setting, and do not change the setting pressure arbitrarily. If the setting pressure is too small, it will often overflow during operation, causing the oil temperature to rise or even stop working; if the setting pressure is too high, it will not function as an insurance and cause damage to the components. The specific setting value is determined by on-site technicians.
(3)When the oil temperature exceeds 70℃, the machine should be shut down for cooling. If the oil temperature is lower than 0℃, replacement of low-temperature hydraulic oil should be considered.
(4)If any component or pipeline fails, it should be stopped immediately and inspected and repaired by trained technical personnel. Do not disassemble without authorization.
18. The bridge erecting machine must be equipped with a lightning protection device, which is left to the user.
19. The carrying capacity of the traveling square beam of the bridge erecting machine cart should meet the relevant requirements, and retaining irons must be installed at both free ends. Big car dealershipThe carriage transport area is equipped with special tools (wedges) and warning signs. If the carriage loses control due to mechanical, electrical or misoperation, wedge irons will be inserted between the running wheels and the tracks so that the bridge erecting machine cannot continue to slide. .
20. Blocks must be installed at both ends of the longitudinal or transverse track of the bridge erecting machine to ensure the safety of the bridge erecting machine.
21. Before the bridge erecting machine is started, the height of the front, middle and rear outriggers should be adjusted to make the longitudinal slope of the main beam of the bridge erecting machine <1.5%.
22. The longitudinal slope of the longitudinal traveling track of the bridge erecting machine is <3%. If it is not met, it should be adjusted to this requirement.
23. When the bridge erecting machine is working downhill, the longitudinal slope of the longitudinal track is >1%～3 %, the bridge erecting machine must be pulled and protected by a winch to prevent the carriage from sliding down.
2. Precautions for safe operation of bridge erecting machine
1On-site construction personnel must obey the on-site command personnel Under unified command, operations can only begin after receiving the command signal from the commander. The whistle must be blown (Bell) before the operation. Signal. If it is found that the command signal is unclear or wrong and causes an accident, the operator has the right to refuse execution and issue a danger signal. You should also pay attention to and obey the danger signals given by other personnel during operation to avoid accidents. Commanders should be familiar with the performance of the lifting equipment they command.
2. Equipment assembly must be carried out by certified personnel with professional work experience.
3. Strengthen safety training for operating personnel. Firmly establish the idea of safety first, and organize all personnel to carefully study the “Safe Operating Procedures for Bridge Erecting Machines”, “Safe Operating Procedures for Hoisting Equipment” and safety regulations for high-altitude operations before construction.
4. Be familiar with the equipment assembly plan so that all staff participating in the construction have an idea.
5. Construction auxiliary facilities should be constructed according to the design plan to ensure sufficient strength, stiffness and stability.
6. Prepare safety supplies for high-altitude operationsAnd wear and use it correctly.
7. Personnel with contraindications to working at heights are strictly prohibited from participating in operations.
8. Commanders and operators are not allowed to stand under suspended heavy objects, and are not allowed to leave their posts without authorization.
9. Lifting operations must be in good lighting and must be stopped when encountering severe weather such as level 6 or above or heavy rain. Assembly work.
10. The operation process should comply with the “Safety Regulations for Hoisting Machinery” and related safety requirements.
11. The lifting equipment used should be in normal operation and pass the test. Check it carefully before use. A test hoisting must be carried out before lifting and it should be normal.
12. The wire ropes, hooks and other lifting tools used must be carefully inspected and must be qualified before lifting operations can be carried out.
13. Personnel entering the construction site must concentrate and wear safety helmets.
14 Lifting equipment and lifting objects should be placed in safe locations, and reliable protective measures such as anti-slip and anti-skid should be in place.
15. Command, operation and auxiliary workers participating in construction are strictly prohibited from drinking alcohol before work and should get enough sleep.
16. When the crane is used to assemble the bridge erecting machine, the system of “nine don’ts” and “seven prohibitions” must be implemented.
Jiu Bu Diao:
1)Not tried yet Hang or not.
2) Do not lift if the lifting weight is too heavy.
3) Non-commanders should give orders without hesitation.
4) Don’t hang up if the signal is unclear.
5) The lifting beam and the shoulder pole are not centered on the heavy object.
6) Length6m and large objects cannot be hung without a traction rope.
7) The noose is unstable and cannot be hung.
8) Heavy objects press each other, hook each other, and clamp each other without hanging.
9) The hanging beam and shoulder pole are hung directly on the object and cannot be hung without protection.
Seven BansStop:
1) It is prohibited for people to stand in the running line or pass under the lifting beam and beam transport vehicle.
2) It is prohibited to stand in blind corners or at the corners of beam transport vehicles.
3) It is prohibited to stand on lifting beams.
4) It is prohibited to use hands to correct beams that are suspended more than 0.5m.
5) It is prohibited to put your hands and feet under the lifted beam to directly remove and place the padding.
6) Disable fast replay when the beam is lowered.
7) It is prohibited to use bridge erecting machines to pull vehicles or hit heavy objects.
17. Safety protection devices such as height limiters and longitudinal and lateral movement limiters should be installed completely to ensure reliability.
18. During work, you should always pay attention to the lubrication and operation of the bearings, reducer, gear rack, and winch system. Non-operators are prohibited from entering the operating site.
19. It is strictly forbidden for lifting personnel to grasp the hook or stand under the lifting beam to prevent accidents caused by sudden failure of the lifting system.
20. It is strictly forbidden to use a crane to lift objects diagonally or to pull objects to avoid accidents caused by excessive mechanical loads.
21After weather, rain or snow, in order to prevent the brake from getting wet and failing, it should be tested and hoisted first to prove that the brake is reliable before work can be carried out.
22. When the bridge erecting machine is stopped, taking a rest or having a power outage, heavy objects should be put down and should not be suspended in the air.
23. It is necessary to always check the tightness of the joint between the wire rope joint and the wire rope clip. The side of the clip with the nut and pressure plate should be on the long end of the wire rope to avoid loosening and falling off. The number and spacing of clips should be arranged according to the specified standards according to the diameter of the wire rope, see the table for details. During the operation of the machine, it is forbidden to touch the wire rope and pulley with your hands to prevent accidents. The wire rope passing through the pulley is not allowed to have joints to avoid getting stuck when passing through. When clamping, the distance between the first clamp and the end of the wire rope should not be less than 140mm. The shackle of the clip must be placed on the side of the short end of the wire rope.
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