Safety Of Crane Research Articles

Prototype Pendeteksi Beban Berlebih Untuk Keamanan Operasi Hydraulic Crane Di Kapal Penumpang

The safety and protection of the hydraulic crane is an important aspect that ensures the charging operation runs safely and efficiently, this study aims to provide protection against crane damage and minimize work accidents by providing overload detection sensors using loadcells and hx711 as the primary sensor in charging this device. This tool is a miniature crane that uses a servo motor and a DC motor as a replacement for the hydraulic on the crane. Where the same function, to move the arm of the crane and crane can rotate left, right, and up. The researchers used prototype methods to build and develop prototypes of cranes. To monitor this control system, use ESP32 as the transmitter and receiver of the joystick motion response. The received data will be processed and displayed on the LCD. Testing this device can detect how much load is lifted and detect if the load is over lifted, the device's operating system will lower the load again if overloaded.

Modal and fatigue characteristics analysis of key components of tower crane

In order to ensure good stability and safety of the tower crane under long-term heavy load conditions, modal analysis and fatigue analysis were conducted on its key components, including standard section and frame section. The connection points of each truss structure were regarded as indivisible common nodes, and the model was simplified and parameterized, resulting in improved mesh quality and computational efficiency. Based on Pro/E, standard section and frame section models were established and imported into Workbench through intermediate data formats for simulation calculations in modal and static structural modules. By calculation, the natural frequency and modal shape of the standard section, as well as the lifespan, damage, and safety factor of the frame section, were obtained. It can be seen that the standard section has good structural stability and can maintain relative balance under excitation in different directions and degrees of freedom. If the safety factor of the web components is high and the service life is improved from a structural perspective, it can be considered to increase the thickness of the chord members.

Finite element analysis of complete structure of tower cranes

In order to ensure the safety and stability of the tower crane in operation, the static and dynamic characteristics of the QTZ100 tower crane in typical working conditions are analyzed by the finite element method, so as to verify the safety of its use and put forward targeted suggestions for the optimization of cranes. The results show that the equivalent stress is less than the ultimate design stress of the tower crane, and there is stress concentration in the plate connected between the upper turntable and the lifting arm. The frequency of the fully loaded motor is far from the normal operating frequency of the tower. The horizontal root displacement of the lifting arm corresponding to the peak displacement response is relatively large. The buckling factor of the tower crane is higher than the empirical value. Therefore, to meet the strength and stability requirements of the tower crane, the connection between the upper turntable and the lifting arm should be strengthened. The motor will not resonate with the tower crane when it is fully loaded, and the dynamic rigidity is poor when it works at the frequency corresponding to the peak value. The buckling factor is higher, so the stability is better.

Factors That Affect Safety of Tower Crane Installation/Dismantling in Construction Industry

Abstract: This paper is to investigate factors that contribute to accidents during tower crane installation/dismantling. Accident analysis and focus group interviews (FGIs) were conducted with people involved in crane work. Accidents occurring during installation/dismantling of tower cranes accounted for 68.4% of all fatal accidents. Accident analysis identified “Not following work procedures” as one of the main causes of these accidents, followed by “unsafe acts of workers.” The FGIs investigation revealed the following factors that adversely affected the safety of the tower crane installation/dismantling: competence of the workers; roles of stakeholders such as principal contractors in the tasks; deterioration of tower crane components; and working conditions for conducting the tasks. These results may provide regulators as well as practitioners with insights for improving the safety of tower crane installation/dismantling.

Research on Dynamic Characteristics of Lifting Rope-Breaking for the Nuclear Power Crane

The nuclear power crane is an important equipment for handling operation in nuclear power plants. The nuclear power crane is equipped to complete the operation even in its own short-time rope-breaking failure state. Therefore, it is necessary to study the possible failure dynamic characteristics and safety of the nuclear power crane. The coupling modeling of the real structure and mechanism of a nuclear power crane is carried out, and the dynamic formula of its rope-breaking failure state is derived. The high-precision three-dimensional model is established, which considers the flexibility of the wire rope and simulates the winding of the wire rope in the pulley groove and the tangency contact relation between the wire rope and the pulley, so as to realize the orderly winding of the wire rope in the space between all the lifting pulleys, making the model both real and easy to solve. For the special spatial parallel winding mode of double wire ropes, the failure dynamic characteristics of the nuclear power crane when one wire rope breaks suddenly and the other one is still able to suspend the lifting weight in the air is studied. The simulation results show that one wire rope in the system fails suddenly under the condition of failure lifting, and the special wire rope winding mode makes the lifting weight remain suspended and continue to lift. From the view of the wire rope stress, the stress of the other wire rope becomes twice of the original after the sudden failure of one wire rope. At the same time, the balance lever and spring buffer device also play an effective buffering role after a sudden failure. The special winding mode of the wire rope and pulley makes the two wire ropes bear the lifting weight jointly.

Research on safety evaluation of portal crane based on energy saving and environmental protection

Crane is an important equipment of national economic construction. Compared with the faulty crane, the crane with good performance has lower energy consumption and less pollution to the environment. In this paper, the analytic hierarchy process is used to evaluate the safety of portal crane, to help users find and deal with the existing problems of crane in time, and to play a positive role in the sustainable development of national economy.

Research on Wind Disaster Accident of Port Crane

Gust is the most serious natural disaster that threatens the safety of port portal crane. The wind resistance of some port cranes is not optimistic, and wind disaster accidents occur frequently. Based on the analysis of some classic cases of wind disasters at home and abroad, this paper finds out the weak links of the wind proof ability of port portal crane, and puts forward the countermeasures to improve and enhance the wind proof ability of port portal crane.

Excavation and support construction of rock wall crane beam layer in underground powerhouse of a pumped storage power station

Rock wall crane beam construction is the focus and difficulty of underground powerhouse construction. The quality of its excavation molding will directly affect the operation safety of the plant bridge crane. This article introduces the excavation procedure of rock wall crane beam for the underground powerhouse system engineering of a pumped storage power station And method, anchor rod construction, net hanging, and spraying construction have achieved good results, and have certain reference value for excavation and support construction of rock wall crane beams in similar projects.

Взаимодействие элементов телескопической стрелы в результате внезапного снятия нагрузки

Nowadays, self-propelled jib cranes equipped with telescopic jib equipment are widely used in construction, loading, unloading and installation works. Accidents of self-propelled jib cranes caused by a sudden break of a cargo rope, as well as spontaneous unloading of cargo, can be attributed to the main causes of accidents of hoisting cranes. This reason can be considered as one of the most dangerous, since sudden release of the load is characterized by unpredictability, independence from the skill of the operator and the transience of the impact. The aim of the work is to study the loading of telescopic boom equipment during sudden load removal and to propose measures to prevent or reduce the consequences of accidents caused by this type of loading. The railway crane “Sokol 80.01M” was selected as the object of study. The method of numerical experiment, carried out in the module of complex dynamic and kinematic analysis of SolidWorks Motion mechanisms was used as a research method. As a result of numerical simulation of instantaneous load removal, balancing of the telescopic boom on the sliding plates and shock interactions of the boom sections were established. The following parameters were determined: the time dependence of the sliding support reactions, the magnitude of shock interactions, and the time dependence of the boom head vibrations. It is proposed to use on a self-propelled jib cranes the “Method to increase the safety and security system of a jib crane”, which, in addition to protecting the crane from overload and from collisions of its boom or load-lifting body with various obstacles (coordinate protection), due to the presence of pyro-cartridges and their control subsystem, ensure the prevention of accidents in the event of a sudden removal of the load from the boom, as well as the protection of the hoisting machine when exposed to random external factors, damage reduction with irreversible loss of stability of the crane. The most rational parameters of the emergency power device for boom equipment were established: the time of action of the squib; the action coefficient of the squibs, the initial force of the squibs, the charge force of the emergency power device on the boom equipment.

Research on Safety Evaluation of Quayside Container Crane Metal Structure Based on 04-FCE

In order to ensure the safety of quayside container crane in service and improve the port safety management level, from the engineering practice, according to the composition of the quayside container crane metal structure of six parts: the front girders, the rear girders, the beams, the trapezoidal frame, the tie rods, the columns, the factors that potentially have influence on the safety of the metal structure are researched, and the safety evaluation index system is built. The dimensionless algorithm of evaluation index is optimized emphatically. For the first time, the “0-4” evaluation method is used to calculate the weight value in the evaluation algorithm, and the 04-FCE evaluation method which combine the “0-4” scoring method and fuzzy comprehensive evaluation is proposed. The safety level and evaluation conclusion of the quayside container crane metal structure are determined, the suggestions for reducing the risk are given, and the rationality analysis is carried out through an example at last.

Structural Strength Analysis of Ship-to-Shore Crane

It is necessary to analyze the strength of STS crane with static load for assessing the safety of the STS crane. A case study of a STS crane with 28 ton capacity and 18 years of working time has been conducted. A testing system with signal sensing, signal conditioning, signal acquiring and signal analyzing has been established. After the field test, all the stresses of the test positions have been calculated and the strength of STS crane with static load is in the allowable range. As a result of this study, a systematic approach to analyze the strength of STS crane with static load is proposed.

Analyzing Vibration Suppression of Nuclear Power Crane with Model Coupling Mechanism and Structure

The nuclear power crane possesses strict safety requirements. Based on the special structure of its hoisting mechanism, it has two sets of independent lifting ropes to drive a hook synchronously and two pressure buffer devices on both ends of winding system’s balancing lever, in order to play protective roles and increase its working reliability. The flexible multi-body dynamics model which coupled mechanism and structure of the nuclear power crane is constructed when broken accident of rope occurs in the lifting process from the ground or smooth lifting. The importance of a buffer damping device installed in crane hoist mechanism has been proved through the vibration simulation about wire rope at the failure state. And the vibration of mechanism and the main girder structure is remitted and controlled at the time of failure in operation. The most important advantage is that has improved the safety of nuclear power crane.

Factors that affect safety of tower crane installation/dismantling in construction industry

Construction of high-rise buildings, large-scale apartment blocks, or construction in urban areas (especially busy downtowns) demands increasingly greater use of tower cranes. Therefore, the installation and dismantling of tower cranes on construction sites is an inevitable task, but also one of the most dangerous in the construction industry. Accidents during installation (including assembling and climbing) or dismantling of tower cranes incur the loss of workers’ lives as well as delays in construction schedules and/or damage to buildings under construction. The aim of this paper is to investigate factors that contribute to accidents during tower crane installation/dismantling in Korea. Accident analysis and focus group interviews (FGIs) were conducted with people involved in crane work. A total of 38 fatal accident cases involving tower cranes occurred between 2001 and 2011. Accidents occurring during installation/dismantling of tower cranes accounted for 68.4% of all fatal accidents. Accident analysis identified “Not following work procedures” as one of the main causes of these accidents, followed by “unsafe acts of workers.” The FGIs investigation revealed the following factors that adversely affected the safety of the tower crane installation/dismantling: competence of the workers; roles of stakeholders such as principal contractors in the tasks; deterioration of tower crane components; and working conditions for conducting the tasks. These results may provide regulators as well as practitioners with insights for improving the safety of tower crane installation/dismantling.

A practical application combining wireless sensor networks and Internet of Things: Safety Management System for Tower Crane Groups.

The so-called Internet of Things (IoT) has attracted increasing attention in the field of computer and information science. In this paper, a specific application of IoT, named Safety Management System for Tower Crane Groups (SMS-TC), is proposed for use in the construction industry field. The operating status of each tower crane was detected by a set of customized sensors, including horizontal and vertical position sensors for the trolley, angle sensors for the jib and load, tilt and wind speed sensors for the tower body. The sensor data is collected and processed by the Tower Crane Safety Terminal Equipment (TC-STE) installed in the driver's operating room. Wireless communication between each TC-STE and the Local Monitoring Terminal (LMT) at the ground worksite were fulfilled through a Zigbee wireless network. LMT can share the status information of the whole group with each TC-STE, while the LMT records the real-time data and reports it to the Remote Supervision Platform (RSP) through General Packet Radio Service (GPRS). Based on the global status data of the whole group, an anti-collision algorithm was executed in each TC-STE to ensure the safety of each tower crane during construction. Remote supervision can be fulfilled using our client software installed on a personal computer (PC) or smartphone. SMS-TC could be considered as a promising practical application that combines a Wireless Sensor Network with the Internet of Things.

Mechanical Characteristic Analysis of Dredger Crane Based on ABAQUS

In order to improve the safety and stability of dredger crane (DC), three dimensional finite element models for the DC were established. By applied loads and boundary conditions, the area of stress concentrations, the axis force of jib cylinder and the reaction force of the king structure was obtained under four typical working conditions. Meanwhile, the related theoretical calculations were accomplished to comparing finite element results and at last some suggestions were given. The conclusions can provide a theoretical reference for the further structure design and optimization of DC.

Enhancing Tower Crane Safety Using Condition Monitoring System

Tower crane is playing a more and more important role in the construction of high-rise buildings. However, crane operators do not acquire adequate conditioning information from tower crane itself to control the tower crane. In order to work safer and more efficient, this paper presents a condition monitoring system (CMS) that provides a solution to receive sufficient information. The CMS can monitor the detailed and comprehensive information, such as lifting moment, swing amplitude and lifting weight, which is related to the safety of tower crane in real time with sense, signal processing and wireless technologies. This CMS aims at degrading the tower crane accidents and protecting the project manager, construction equipment and operators from dangerous situation.

하중을 받는 타워크레인의 구조 안전성 해석

본 연구에서는 타워크레인의 지브 끝에 하중을 주고 마스트에 모멘트를 주어 그에 따른 변형 해석을 수행하여 다음과 같은 해석 결과를 보았다. 지브를 지지하고 있는 와이어의 끝 부분에서 응력이나 변형이 가장 많이 일어남을 알 수 있었고 하중이 작용하는 지브의 끝 부분에서 변형이 많이 일어나고 마스트 밑 부분은 변...

Reliability Analysis for Crane Boom Base on Probabilistic Finite Element Method

Working condition and structure for crane boom is quite complex. In order to ensure the safety of crane, there is a high requirement for reliability. In this paper, probabilistic finite element method is used to analyze the reliability of crane boom. Parametric finite element model of crane boom is built and uncertain parameters are obtained by analyzing characteristics of dimensions, materials, loads and constraint conditions for crane boom. Uncertain parameters like structural dimensions, material parameters and loading parameters, etc are processed discretely and reliability of crane boom is obtained by using Probabilistic Design System (PDS) of ANSYS. Meanwhile, we can get the main parameters which affect reliability of crane boom and how much their influences will be by sensitivity analysis.

Safety and serviceability assessment for high-rise tower crane to turbulent winds

Tower cranes are commonly used facilities for the construction of high-rise structures. To ensure their workability, it is very important to analyze their response and evaluate their condition under extreme conditions. This paper proposes a general scheme for safety and serviceability assessment of high-rise tower crane to turbulent winds based on time domain buffeting response analysis. Spatially correlated wind velocity field at the location of the tower crane was first simulated using an algorithm for generating the time domain samples of a stationary, multivariate stochastic process according to some prescribed spectral density matrix. The buffeting forces applied to the structure were computed according to the above-simulated wind velocity fluctuations and the lift, drag, and moment coefficients obtained from a CFD computation. Those spatially correlated loads were then fed into a well calibrated finite element model and the nonlinear time history analysis was conducted to compute structural buffeting response. Compared with structural onsite response measurement, the computed response using the proposed method has good precision. The proposed method is then adopted for analyzing the buffeting response of an in-use tower crane under the design wind speed and the maximum operational wind speed for safety and serviceability assessment.