What are Pavers?

Paver is a kind of construction equipment mainly used for paving various materials on the base and surface layers of expressways. A variety of different systems cooperate to complete the paving work, mainly including the travel system, hydraulic system, conveying and distribution system and so on.

(One) Crushed Stone :

Aggregate spreader is one of the road construction machines. Construction machinery capable of spreading crushed stone evenly on the roadbed. It is mainly composed of hopper, support roller, skid, V-shaped scraper, widened side plate and running wheel, etc. ^[1]

1. Paver operators must go through professional training, understand mechanical properties, structure, master maintenance knowledge, master the machine performance and operation essentials and safety matters, and can only operate independently after they are qualified by relevant departments.

2. Check before starting the engine: oil (

1. Hydraulic oil is too hot :

Excessive oil temperature in the hydraulic system of the paver will reduce the viscosity of the oil, increase the amount of leakage, damage the oil film on the lubricated parts, and aggravate the wear of the parts; at the same time, the high temperature will make the gasket made of rubber and other materials premature Damage due to aging. Therefore, it is very important to control the proper oil temperature. When the oil temperature is too high, it must be stopped and checked. Generally, it can be started from the following aspects:

(1) Inspection

1. Daily technical maintenance

(1) Clean the paver: remove the mud, sticky sand and asphalt accumulated on the surface of the paver; remove the dust and grease on the surface of the engine, hydraulic components and other components. Be careful not to get dirt into the filling ports and

With the diversification of highway grades in China, grade highways, county-rural highways and urban roads are advancing at an unprecedented scale, standard and speed. At the same time, the speed of pavement construction is also increasing at a "rapid speed". This promotes the mechanization of highway construction, and also puts higher and higher requirements on the technical level of construction machinery, construction technology, pavement materials and pavement structure design. The level of construction machinery technology and construction technology have an important impact on highway grade and construction speed.

Modern road transportation has continuously increased the requirements for road surface strength, stiffness, compactness, uniformity, flatness, driving comfort, high-speed , and safety . Under the current transitional mechanism in China, power and Authorities cannot fully exercise their reasonable responsibilities, attach importance to short-term interests, pursue performance and political achievements, and despise pavement cost, pavement construction quality, apparent speed and huge scale of construction. As a result, artificial "mechanization", artificial "speed" and artificial "quality "It has also brought about the rapid development of construction mechanization. Therefore, the main product of the black pavement construction machinery, which is mainly responsible for China's highway network, has shown a rapid development trend and has been favored by the construction machinery industry.

Paver currently used in China:

Foreign brands are: ABG, VOGELE, DYNAPAC in Germany, BK in the United States, Bitelli in Italy, Marini, and Niigata in Japan. The main domestic brands are: Xizhu, Shaanjian, Xugong, Brilliance Huatong, Zhonglian, Sany Heavy Industry, Xinzhu, etc. According to China s construction status and policy mechanism, European-style low-speed, high-density, and medium-wide paving construction techniques are widely used. German ABG structural paving has led the industry trend, but from the 1990s, The large-scale generation (that is, the paving width is greater than 9m, even to 16m) has developed into the medium-sized in the 21st century, that is, the rationalization of paving width has returned to the dominant position of 6-9m models, which has led many domestic manufacturers to readjust their development ideas. , The major paver manufacturers have a hundred flowers blooming, and a hundred companies are arguing. The paving width covers 4.5 to 12.5m, and the thickness covers 10 to 350mm. The paving width is 6 to 12m, and the middle is 4 to 6m. The technical level is high (full hydraulic, fully automatic), medium (semi-mechanical hydraulic, semi-automatic), Low (mechanical); the product sells high (more than 2 million yuan), medium (more than 800,000 yuan), low (under 800,000 yuan) three series of products for the construction unit to choose.

In addition to the approval of the construction unit and the advice of the operator, the paver has a large degree of administrative intervention, which has resulted in the absence of a completely reasonable standard for evaluating the quality of the paver. This has to make us think about the scientificity and rationality of the current technical standards, the feasibility of paver manufacturing and the economics of construction. For example, in recent years, two large or even From the viewpoint of three pavers working in parallel, in the near future, there may be parallel paving on the left and right, plus two or three layers of simultaneous paving operations. As far as highway construction machinery in China is concerned, the technological advancement of the paver is in sync with developed countries in Europe and the United States, such as the use of digital automatic leveling devices, non-contact balance beams, and asphalt mixture transfer vehicles. Compared with the international advanced level, there is still a large gap, which may indicate that China's construction technology and pavement design need great improvement, and the impact of the paver's manufacturing and processing quality and paving technology on pavement quality can not be ignored. Due to the higher requirements on the design and manufacture of the paver machine due to the construction process, and the higher technical standards for the paver industry, at the same time, with the deepening of the market access system, the industry standards and national standards are just a macro Control and inspection of results, lack of strict enterprise standards (assembly quality and interchangeability requirements), rather than mandatory design standards and manufacturing standards in the era of planned economy, whether the machine can be used by the enterprise or not, this is what entered the market One of the main reasons for the difference in quality between domestic and imported machines. Therefore, it is necessary to formulate a reasonable industry standard and enforce it. The Construction Machinery Association is organizing the preparation of a paver industry standard.

With the continuous development of electro-hydraulic control technology, the continuous improvement of construction technology and the increase of market user requirements, pavers may have the following development trends:

(1) Diversified models

Paver manufacturers at home and abroad are pursuing product diversity, that is, products with different width series of 4.5 to 12.5m are developed in the width series. The technical level is high, medium, and low, and the prices are high, medium, and low. Products to meet the requirements of construction units at different levels and highway construction.

(2) Hierarchical development of technology and economy

The most important index of the paver is the compactness and flatness. At the same time, with the development of electro-hydraulic control technology, the comfort of operation and the convenience and convenience of maintenance make the paver move towards a technical and economical type. Development on two fronts. Technical paver has functions of central communication, constant speed control and fault diagnosis, digital ultrasonic leveler, centralized lubrication, etc. Economic paver pursues reliability, practicality, simple operation and low price.

(3) Joint operation of multi-layer paving and transfer vehicles

With the change of construction technology, more and more machines will be used to prevent the segregation of sidewalks and joints. It is also a problem we should consider. At the same time, in order to prevent the segregation of temperature and pellets, transfer vehicles may be more and more. The more adoption, on the other hand, the transfer paving construction technology is the best verification of the rationality of China's current highway structure design, standardization of construction management and supervision systems, and the rationality of mechanized supporting facilities.

In short, with the continuous formation of the road network and the continuous improvement of construction technology, the development speed of the paver will slow down, and people's requirements for the paver will become increasingly reasonable. As the technology of the paver continues to be updated, its price will also increase. relatively stable. We believe that the paving machine will eventually develop healthily and steadily based on the two-way requirements of technology and market. Domestically produced paving opportunities will become a new force in China's highway construction. ^[4]

With the continuous expansion of China's highway infrastructure market, the demand for paver products has also shown a rapid growth trend. In terms of sales structure of paver sales in 2011, market demand products are mainly concentrated in 8 to 9.5m models, followed by 9.5 12m pavers. From the perspective of products sold by major enterprises, the mechanical type is currently mainly concentrated in Huatong Power and CCCC Xizhu. The hydraulic type below 9.5m is the main development trend of various enterprises ^[2] .