Analysis of concrete mixing truck accidents

 

0 Introduction

  Every year because of concrete mixing truck traffic accidents, according to statistics not million, we also regularly in newspapers, TV news media to see the accident reports about the mixing of the car accident.

 Case 1:2008 on November 27th at ten twenty in the morning, Wuhan City, Optics Valley Avenue South Lake Road, from east to West Road car, accident and a road opposite the concrete mixer truck, mixer truck rollover car pressure under the car.

Case 2:2008 on November 27th afternoon, Taiyuan City Five Dragon Street and Twin Towers Road intersection traffic accident happened, in turn into a pedestrian accident this concrete mixer car.

Case 3:2008 on November 13th afternoon, Zhengzhou City Longhai Road and Beijing Guangzhou road, southeast corner of the intersection, the 102nd middle school in Zhengzhou, a 13 year old girl Zhao Yue straight road, is a concrete mixing truck knocked over and over, died on the spot.

Case 4: from Wuxi city Traffic and patrol police accident department to know, in 2008 only to concrete mixer which an engineering vehicle traffic accident to have 55 cases, resulting in 22 deaths, 57 people were injured, but the accident especially.

......

The concrete mixer truck accident phenomenon, all departments and traffic management departments of the concrete mixer is also introduced various rules and regulations, such as the Anhui Hefei Municipal Public Security Bureau police detachment of the second half of 2008 continuous organized the 4 times concentrated rectification actions, there is the concrete mixer illegal act 167, detained unlicensed unlicensed vehicles 25. Zhejiang, Hangzhou, Shanghai, Beijing, Changsha and other places also have carried out a series of concrete mixing truck rectification activities, through these activities, to a certain extent, reduce the accident frequency. But the concrete stirring transport vehicle accident frequency is higher than other vehicles, by analyzing the cause of structural features and accident on the mixing of the car itself, some conclusions are drawn, hope to be able to give some reference to the relevant departments.

 

Analysis of 1 accidents

Analysis of 1.1 mixer itself

(a) structure and the running characteristic

 

   Concrete mixing truck is mainly composed of two types of chassis, transmission system, hydraulic system, frame, mixing tank, feeding and discharging device, water supply system, control system, ladder and other components. Belong to refit vehicle of concrete stirring transport vehicle, the vehicle center of gravity is modified Chassis FRONT significantly increased. The mixing tank is connected with the speed reducer is installed on the frame front, back through the raceway is mounted on the frame of the two roller support background. Its working principle: Powered by two type chassis taking full power output through a driving shaft transmits power to the hydraulic pump, hydraulic pump hydraulic through tubing to the hydraulic motor, hydraulic motor, the hydraulic energy into kinetic energy through the reducer torque delivered to the mixing tank, through adjusting (double action variable) servo handle angle of hydraulic pump to realize the rotation direction and speed of stirring tank size, in order to realize the concrete charging, mixing, stirring, discharging operation.

   Traveling has the following characteristics: concrete mixing truck belonging to the city transport vehicles, most of the transport time to turn, to avoid pedestrians and other vehicles. In addition, mixer in transit mixing drum to be rotated with a concrete, the

The center of gravity toward the direction of rotation offset, so that the center of gravity of deviation of the vehicle longitudinal axis.

The structure and the characteristics of driving can easily make a concrete mixing truck is easy to turn an accident, therefore also often see concrete mixing truck rollover on the roadside or gutter phenomenon.

(two) the concept of concrete mixing vehicle maximum speed

A concrete mixing truck (hereinafter referred to as the transport vehicle) with maximum speed, the samples are almost all references chassis maximum speed modification, generally at about 90km/h. Some manufacturers even the chassis top speed of the vehicle top speed of written instructions. However, China's automotive industry standard QC/T667 2000 "technical conditions" of concrete mixing truck article 4.1.8 clearly stipulates: stirring speeds, the maximum speed of not more than 50km/h. By calculating the mark, concrete mixing truck at full speed of 90km/h concrete, the safe minimum turning radius is about 3 times the speed of 50km/h. That is to say, concrete mixing truck at a higher rate than the 50km/h speed driving, traffic accidents are likely to happen. But the traffic administrative department and the public security departments are mostly for different grades of highway of the limit line and speed processing, no special for more than a top speed of concrete mixing truck for effective management, but in general, the highway and city road speed limit value is far more than the top speed of stirring vehicle.

But now we often see on the road. The concrete mixing truck, speed is far more than the maximum speed of 50km/h. The body weight, kinetic energy mixing car driving up quite scary, relatively weaker braking effect, coupled with the speeding, braking shoulder much larger than their own ability and. So often see the mixing truck brake failure accident is emerging, that is the main reason the car accidents often happen.

 

Analysis of the internal causes of 1.2 concrete enterprise

(a) special work system concrete enterprise

At present a lot of concrete companies still use the 24 hour day working system, rest for 24 hours after 24 hours of work, no weekend basically, many legal holidays for the concrete enterprise engaged in technical and production staff basically belongs to talk. About 24 hours every day work system and the concrete operation of the enterprises and the characteristics of the concrete materials, the majority of concrete mixing station are in the periphery of urban or suburban city city, many city regulations during the day no driving in urban road concrete mixer truck, so many projects need to be working during the night. In the hot summer, night construction also helps to reduce the internal concrete hydration heat, delayed time internal Wen Feng concrete, favorable to the concrete crack control. However, 24 hours every possibility of working system for concrete mixing truck driver fatigue driving.

In addition, at present a lot of concrete mixing station take the basic salary plus piecework wage system. The van driver treatment and transportation of concrete number and volume, at present most vehicle transport volume of similar circumstances, the final salary levels on the number and transportation of concrete. Therefore, in order to get more money, but also encourage them to stop the Dora run, at the same time mixing station scheduling often by urging GPS positioning these drivers can arrive on site in the shortest time, so as not to affect the performance of concrete. So often speeding, running red lights, but also prone to traffic accidents.

 

(two) seek nothing but profits related departments

Concrete mixing vehicle price is not high, so many people use the purchase mixer lease for the concrete enterprise service. Rental car owners are responsible for the payment of wages by the driver, the mixing station settlement according to the transportation of each car quantity and owners, and other independent stirring station. In order to recover enough car cost and profit, the owner generally require drivers to day and night shift, "run quickly, make more money, you do not pull, pull a person, is anxious to make money, some driver quality too, it can hardly be avoided an accident", "the new car price about 600000 yuan, a year earn enough son sold, according to sell half price calculation, the owner of a year net profit of 30 ~ 400000 yuan no problem." In a concrete company team captain says.

Concrete mixing truck management more difficult, because most of the city is vigorously engaged in engineering construction, concrete mixing truck is in great demand, strictly limited, police questioning not appropriate or practical, especially for the mixing truck speeding problem, not only difficult to obtain evidence, legal punishment is too light, treatment is also relatively difficult.

In addition, another reason is management of concrete mixing truck is at present many anchored concrete mixing truck is the boss behind the relevant departments in charge of the leadership, especially the small and medium-sized city, network popular, traffic police management difficulty.

 

2 related measures and Solutions

 

 2.1 the parties cooperation, strengthen management

Through the above analysis, concrete mixer to driving safety, not only need the vehicle manufacturers to produce safe vehicle, and a detailed description of the highest speed, not false propaganda. At the same time to transport management departments, city construction administrative department, the public security traffic multi sector collaboration, but also to all over the world and concrete enterprises, industry associations and other departments jointly, from the source to pay close attention to concrete mixing truck traffic safety.

Industry associations and enterprises should coordinate the mixing truck management model to the concrete, such as the 24 hour working day system into 8 hours of work, the income and the driving safety are closely linked.

 

2..2 to avoid accident: improve safety awareness is the key

    Almost 90% of theCementStirring vehicle accidents are caused due to overspeed. Yes, we haveCementStirring vehicle speeding, and some other vehicles overspeed. In the final analysis, or safety reasons in lack of consciousness. Only every driver always maintain a high level of security awareness, to avoid the accident disaster.

 

2.3 installation of GPS positioning system

GPS positioning system can not only on concrete mixing truck for precise positioning and real-time monitoring, can monitor the running line, the speed of transport vehicle, which not only in vehicle management provides a convenient can also monitor the vehicle during operation is speeding phenomenon to the dispatching department concrete enterprise, this also for public security traffic law enforcement departments in the vehicle at the time of the accident to provide a basis for law enforcement. At present, many local concrete enterprise departments or local governments on concrete mixing truck installed the GPS positioning system. Such as Hangzhou city commercial concrete mixing truck to the association of 1768 concrete are equipped with the GPS, the association has also established the GPS positioning system, the establishment of a unified platform. By this measure, reduce the incidence of one times above Hangzhou City, concrete mixing truck accident.

2.4 strict factory closed concrete mixing truck

Considering the current concrete enterprise affiliated vehicles more, so it is necessary to strengthen the management of vehicles. Affiliated engineering transport enterprises must obtain the issuance of the road transport management institution business license according to law, the vehicle must be legally qualified, practitioners must go through safety training, in addition to the appropriate level issued by the Department of transportation's driver's license, at the same time, also must hold a licence to work; to undertake business transportation enterprise must be signed safety responsibility agreement with the owners safety responsibility agreement, signed with the affiliated owners, drivers, and regularly arranged on the security study.

2.5 paste reflective logo to prevent turning "kill"

Concrete mixing truck "man", the vehicle height, when the vehicle turns, often caused by the rear blind spot. To effectively avoid the occurrence of concrete mixing truck to night and collision, the body of the transport vehicle to paste reflective logo, body side and rear shall be fitted with protective device. Do not comply with the paste body reflective logo, installation and transportation vehicle side and rear protective device requirements, must be strictly punished.

At present, due to an accident more concrete mixer truck, in some places has caused outrage, hope the relevant departments to coordinate, to reduce and avoid the occurrence of accidents. Police expresses, the life is valuable, also hope to life for all concrete mixing truck driver, drive carefully.

                                                 In this paper, the blogger published in "Chinese building materials reported" concrete monograph