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About "Ten Not Hanging" in the Use of Tower Crane

  Tower cranes are widely used as vertical transportation machinery in construction operations, and have become indispensable construction machinery in construction. As a large-scale construction machine, the analysis has the following characteristics from a safety perspective: 1. It usually has a huge structure and a relatively complicated mechanism, which can complete one lifting movement, one or several horizontal movements.   2. There are many kinds of heavy loads, and the load is variable.   3. It needs to be operated directly in a large range, and the activity space is large.   4. There are many exposed and moving parts, and often come in direct contact with lifting operators (such as hooks, wire ropes, etc.), which has many potential risk factors.   5. Complex operating environment.   6. It is often necessary for multiple people to cooperate to complete an operation.   The existence of many of the above-mentioned risk factors determines that there are many accidents of lifting injuries, and once an accident occurs on the tower crane, not only the property loss but also the personal injury most of the time, the impact is greater, so it has been classified as special equipment management. The manufacturing, installation, use, and maintenance of the company have issued relevant specifications and regulations. The relevant departments or units have summarized the "ten no lifting" regulations for lifting operations as long as they adhere to this "ten no lifting" "In principle, tower crane accidents can be avoided to the greatest extent. However, in the actual production, there is no scientific, specific and practical version of the "ten-no-hang", and there are no special provisions in the relevant specifications of the tower crane. This article attempts to analyze and summarize the various versions of our site and various specifications of tower cranes, and on this basis, put forward specific regulations on the "ten do not hang" tower cranes for your reference.   Now lists the relevant "ten not hang" circulated in our place as follows:   1. The tower crane "Ten No Cranes" in the book "Safety Management System for Construction Sites" issued by Chengdu Safety Supervision and Management Station:   1. Someone staying or walking under the boom and lifting heavy objects is not allowed to hang.   2. The hoisting command should be performed by full-time personnel qualified in technical training. No command or unclear signal is not allowed to hoist.   3. Slender materials and multiple objects such as steel bars, steel bars, pipes, etc. must be tied firmly, and the single-headed "kilogram" or untied strapping is not allowed to hang.   4. Perforated plates, hoppers, and hand-pull dump trucks do not require four-point or large template plug-in plates, and are not allowed to hang when unloading armor cranes. Prefabricated reinforced concrete floor slabs are not allowed to be double-slung.   5. Hanging blocks must use safe and reliable block fixtures. Hanging bricks must use brick cages and be neatly stacked. Wooden bricks, embedded parts and other sporadic objects should be stably stacked with containers.   6. Floor, girders and other hanging objects are not allowed to hang.   7. Sheet piles, well point pipes, etc. buried in the ground, as well as sticking and adhering objects are not allowed to hang.   8. Multi-machine operation should ensure that the distance of lifting heavy objects is not less than 3m. When operating on multiple machines on the same track, it is not allowed to hang without safety measures.   9. Strong winds above level 6 are not allowed to hang.   10. Hanging heavy objects or exceeding mechanical allowable load is not allowed to hang.   The first of the above, "Someone stays or walks under the boom is not allowed to hang". This is definitely unavoidable in the construction site, because when the crane crane rotates, it almost covers the entire site, under the boom. There must be someone who stays or walks; "there is a person who stays or walks under the suspended heavy object and is not allowed to hang" is already contradictory. If it has already been lifted, it is required that it is not allowed to be hung, so this is meaningless. In the fourth article, the hopper is probably a special hopper that is equipped with the tower crane. This must be lifted at four points, but the hand-overturned hopper truck is afraid that it is forbidden to be used for lifting materials, so this article should also be modified; the rest of the articles are only It illustrates some particularities, not completely.   Second, the tower crane "Ten No Cranes" in "Migrant Workers Night School Reader" from Chengdu Safety Supervision and Management Station   1. Overload and oblique pulling are not allowed to hang.   2. The bulk goods are too full or the strapping is not allowed to hang.   3. No command, disorderly command and unclear command signal.   4. The edge of the hanging object is sharp and ther
Several factors causing the accident of tower crane

Several factors causing the accident of tower crane

  Due to the particularity and structure of the tower crane, its safety concealment exists in many factors such as installation, use, management, natural environment and so on.   (1) The structure of the tower crane itself   The rigidity, stability and strength of the tower crane steel structure directly affect the safety of the tower crane. Because the crane is subjected to frequent alternating loads during the operation, it is very easy for the steel structure friends to fatigue and break the maple. For example, cracking of the welding seam of the tower crane web, fracture, deformation, and bending of the base material reduce the rigidity, stability, and strength of the structure, cause the steel structure to break thinly, and destroy the local stability of the steel structure. Introduce friends accident.   (2) The quality of electrical systems and institutions   The working mechanism of the tower crane adopts electrical movement and control. The advantages are convenient control, saving cost and low cost. At the same time, electrical components are easy to achieve standardization and generalization, easy to replace and maintain, and easy to realize various safety protections. The working state of the electrical system of the organization determines the reliability, safety and performance of the tower crane. If there is damage or abnormality. It may cause an accident. If the electrical system fails, it can cause shock vibration of the mechanism, resulting in broken shafts and broken teeth and attracting friends. Damaged clutches or brakes or vector control may cause crashes and heavy objects. Aging electrical insulation or broken cabinets may cause electric shock. The failure of various safety devices may lead to accidents such as falling towers, folding arms and falling heavy objects. If the amplitude limit or travel limit is invalid, it may cause a big car or a small car to rush and even derail. The overload limiter and torque limiter fail, and the arm and tower may fall.   The failure of the height limiter may cause the wire rope to overwrap into broken rope and fall accidents of heavy objects. Phase sequence protection vector rescue, in the case of wrong phase and broken phase. It may cause disorder of operation instructions and cause accidents.   (3) Human factors   In many tower crane accidents. Most accidents are due to user violations or misuses. The two accidents mentioned below also have elements of illegal operations.   A non-driver of a certain unit does not ring the bell to drive. As a result, the extravagant workers on the track were crushed. When the installation team of a machinery construction company inspected the TQSOB tower crane, in order to replace the boom puller, it was prepared to remove the balance weight first and then replace the pull plate pin to connect the boom and the lifting rope together , And then use the car to lift the boom. Open the boom pull plate pin. When lowering the boom, the backward tilting moment due to the balance weight is very large, causing the tower crane to lose its balance and causing the balance arm and the tower tip to fall together.   Accident during disassembly. Due to the high weight of the metal structure of the tower body, the disassembly and assembly of the tower crane is a high-altitude operation, which is dangerous and technical. Among the tower crane accidents, the accidents during the disassembly and assembly account for a considerable proportion, and they are relatively large accidents. Some tower cranes are not disassembled by professional installation teams but by non-professionals. Due to the low quality of the installation personnel, the ability to prepare installation plans, the ability to select schemes and mechanical calculations, and the ability to formulate scientific disassembly and assembly, so that new problems or special problems in the operation process cannot be solved, something happened   is inevitable. The quality of some installations is substandard, leaving hidden dangers.   Improper management. Insufficient training of the staff, insufficient understanding and implementation of various rules and regulations, and insufficient management of the work site have all laid hidden dangers for the accident. Some enterprises have unsound systems and staff have no rules to follow, so they have to rely on personal experience to operate and are prone to making mistakes. Some enterprises do not implement special personnel planes. In addition, different factory models have different operation handles. Therefore, it is possible for the driver to make mistakes; some work sites temporarily combine some staff for work needs, making it difficult for the commander, driver, and rigger to achieve   The industry is coordinated, and some non-professionals or leaders temporarily act as operating personnel, which will inevitably lead to errors and accidents; some companies do not pay attention to maintenance management and fail to eli
Maintenance of slewing bearing device of tower crane

Maintenance of slewing bearing device of tower crane

  (1) The mounting support of the slewing bearing (the seat supporting the bottom surface of the ring gear and the seat placed on the upper surface of the inner ring) must have sufficient rigidity, and the mounting surface should be flat. Before assembling the slewing bearing, the bearing should be stress-relieved to reduce the deformation of the slewing bearing. The contact surface of the bearing and the slewing bearing must be cleaned up during assembly.   (2) Pay attention to the change of noise and the change of rotation resistance torque during use, and disassemble and inspect if there is any abnormal phenomenon.   (3) The slewing bearing must be lifted or stored horizontally. Do not lift or store it vertically to avoid deformation.   (4) Before the bolts are fully tightened, the gear meshing inspection should be performed, and the meshing condition should meet the requirements of gear accuracy: that is, the contact spots distributed on the tooth surface of the gear pair after running under slight braking are in the height direction of the gear teeth Not less than 25%, not less than 30% in the length direction of gear teeth.   (5) The debris should be removed once for 10 shifts of tooth surface work, and re-applied with grease.   (6) In order to ensure the reliability of the bolt work and avoid the insufficient preload of the bolt, the preload torque of the bolt should be checked separately after the first 100 hours and 500 hours of the slewing bearing work. The pre-tightening torque should be checked every 1000 hours thereafter.   (7) High-strength bolts and nuts are used for bolts and nuts connected to the slewing bearing; double nuts are used for fastening and anti-loosening.   (8) When tightening the nut, the thread of the bolt and the end surface of the nut should be coated with lubricating oil, and should be tightened with a torque wrench symmetrically and evenly in the circumferential direction multiple times. During the last tightening, the pre-tightening torque on each bolt should be approximately uniform.   (9) Four oil cups are evenly distributed on the upper surface of the slewing ring gear aligned with the raceway, thereby adding grease to the raceway. Under normal circumstances, the slewing bearing is lubricated once every 50 hours. Each time you add oil, you must add enough oil until grease leaks from the seal.
Energy saving, tap potential, reduce energy consumption, increase efficiency, generate income and promote development

Energy saving, tap potential, reduce energy consumption, increase efficiency, generate income and promote development

  In response to the call for building a conservation-minded society, energy saving and consumption reduction, Linyi Huaxia Heavy Industry continuously improves its internal management level, fully taps its internal potential, and vigorously implements energy-saving potential tapping measures to reduce production costs and improve economic efficiency.   In order to save all kinds of production resources, we insist on energy saving starting from bits and pieces, and take the "save electricity, a drop of water, a piece of paper, a drop of oil, a penny" activity as a long-term project, let informal papers use paper Thrifty behaviors such as double-sided printing and people turning off lights have become a habit and a normal condition in the work life of the majority of employees. At the same time, it is firmly to eliminate the waste on the production site, so as to turn off the power in time and operate various equipment in accordance with the operating procedures. The earth reduces the consumption of various materials. In order to effectively reduce the consumption of raw materials, our company strictly controls the admission inspection and processing quality in raw material procurement and production to ensure that raw materials are used in high quality and efficient. For the management of the company's vehicles, the company formulates fuel consumption standards per 100 kilometers, and gives negative incentives to drivers who exceed the fuel consumption standards. At the same time, the vehicle speed is monitored through the monitoring system to prevent the phenomenon of fast driving, improve vehicle performance, and reduce abnormal maintenance costs.   The company implemented a series of energy-saving potential tapping measures, which has effectively reduced energy consumption levels, lowered production costs, improved economic efficiency, and to a certain extent, also enhanced the company's market competitiveness. The company will continue to implement in-depth energy saving and tap potential work to promote the company's sound and rapid development.

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