Highway construction new technology and new technology?

The increasing level of national economy, so that the number of private cars is also increasing, so that the traffic and transportation volume and highway pressure greatly increased. China's highway, but after a period of time, the phenomenon of damage is becoming more and more serious, so that the normal passage of vehicles has been greatly affected by the chance of traffic accidents also gradually increased. At this stage, the rapid development of science and technology, in order to extend the life of the highway, so that the quality of highway enhancement, a variety of new technologies and new techniques have emerged one after another, and the use of many of its own advantages in the application of highway construction, not only to make up for highway defects, but also to make the quality of transportation has been ensured. The following is the main content of the highway construction of new technologies and new techniques brought by the consulting for reference.

A new technology in highway construction

(A) curb slipform construction technology

In actual highway construction, the curb may be both on both sides of the highway between the roadbed, but also in the median and the pavement between, and set up this part of the purpose is mainly because of: to protect the pavement with the whole pavement neat and tidy and the relevant requirements in line. The use of curb slip film construction technology is the use of electronically controlled hydraulic curb slip film paver to carry out slipform paving construction work [1]. Because of the use of hydraulically driven curb slip film paver, which can greatly improve the paving efficiency, but also allows the material to get the maximum savings, and most importantly, can make the smoothness of the operating surface line can be guaranteed, so it is widely used in today's Gondo highway construction.

(2) flexible grass-roots technology

Past highway projects in the roadbed disease treatment, are taken this measure, that is, in determining the roadbed disease, remove the original grass-roots level, and on this basis to re-enter the semi-rigid grass-roots level and asphalt surface layer treatment. This treatment takes a long time, and after the treatment also need to do a good job of subsequent maintenance, and then easy to block the traffic, so that the transportation effect of the highway is reduced. For this reason, the flexible base layer technology began to appear, that is, in the treatment of disease using asphalt top layer, medium surface layer and flexible base layer, on the one hand, the roadbed structure can be improved, on the other hand, can also avoid the occurrence of roadbed stress concentration caused by cracks concentrated upward emission phenomenon. Theoretically, the main component of the flexible base layer is asphalt, which has good drainage performance, and there is no need to worry about a large amount of water residue during construction.

(C) foam asphalt cold regeneration technology

Compared with the traditional hot asphalt, foam asphalt cold regeneration technology has obvious differences, its steps do not involve drying aggregates and heating aggregates, in other words, that is, before the realization of the foam asphalt, you need to hot asphalt will be injected into the water at room temperature, and then in the role of the temperature of the water, prompting the hot asphalt thermal expansion, and ultimately generate A number of bubbles are generated and rupture occurs. After rupture, the foam asphalt consists of many small particles, after encountering the aggregate, penetrate into the gap in the aggregate, then the aggregate will become accompanied by asphalt gap, the stability of the very strong fine filler. It is often used to increase the thickness, generally used in the pavement base layer and asphalt underlayment. Ensure that the rationality of the recycled mixture ratio is the key to the use of foam asphalt cold recycling technology, if the ratio is not appropriate will let the caulking is greatly affected, and then the practical significance of this technology is lost.

(D) *** vibration crushing technology

In highway construction, *** vibration crushing is a new technology, to a certain extent, the construction cost reduction, the technology can be a good repair of the concrete road, to prevent the pavement in the process of putting into use because of uneven force and deformation caused by the emergence of the situation. *** vibration gravel technology can promote the acceleration of the entire construction process, so that the operation is more efficient and rapid, to ensure the goodness of the pavement drainage function. On the highway launch crack phenomenon, traditional technology is difficult to eliminate it, but *** vibration crushed stone technology can do, so that can maximize the reduction of pavement damage.

Two, the new technology and new techniques in the construction of specific applications

(a) in the application of roadbed construction

Roadbed filling pressure requirements are very strict, must meet the standard before the next step in the construction. The rescue measures taken when the standard requirements are not met include mixing coarse granular materials, lime and other materials, at the same time, the use of geosynthetics reinforcement, gray soil squeeze piles, lightweight embankment and other new technologies can effectively compact the roadbed. The traditional way is to use the larger tonnage roller to carry out the construction, only the roadbed compaction, so that the road surface can be uniformly stressed, so as to avoid the phenomenon of unevenness after the road surface is put into use. In the construction of soft soil pavement, the process of laying soil in the front, the construction of embankment in the back. With the help of advanced measures to build the soft soil layer of the upper layer, not only can stabilize the pavement, but also to ensure the normal drainage, usually with the help of geotextile fabric to start stabilization.

(2) Application in pavement construction

At the present stage, there are two main types of highway pavement in China, namely, cement concrete pavement and asphalt pavement, but the former is slightly weaker than the latter in terms of construction technology, equipment level, and stabilization performance. Cement concrete pavement in the panel density, material homogeneity are difficult and relevant standards and objectives, due to artificial is the main force of cement concrete pavement, so it is difficult to construction projects require some precision and details of the effective solution, so it is easy to damage the cement concrete pavement, so that the solidity of the impact, and the sliding film construction technology to be used to make the cement concrete pavement is not solid enough to determine a good improvement. The determination of the cement concrete pavement is well improved.

(3) in the pavement maintenance application

1. Pavement repair fixed construction. This process is often used in the process of large-scale repair of highways, has a very obvious effect. Specific requirements are: in the process of laying fiber geogrid with the help of fixing method, you need to sprinkle sticky layer asphalt on the substructure of nails and iron fixed on top, and then longitudinally to the grille pulled tight, and segmented unfolding of the fixing; *** grid lap distance should be controlled in the transverse lap and the longitudinal lap were 10 ~ 15 cm, 10 ~ 20 cm range; in the process of fixing can not be in the fiberglass Nails on the process of fixing, can not use the hammer to hit the glass fiber, if found broken nails, should be the first time for fixing; will be fixed after the completion of the need to properly grind with the help of rubber wheel rollers, so that the work grille can be firmly bonded to the original road surface; in addition to the completion of the fixing of the same day must also be asphalt concrete paved in the work grille, and with the press will be milled into shape. 2. Pavement repair self-adhesive construction. This process is applied in the highway partially damaged grass-roots level, the specific process includes: spray adhesive oil layer to the road surface has been treated grass-roots level, and the laying of work grid, work grid between the transverse joints along the direction of the paving lap distance of 75-150mm, the longitudinal lap distance of 50mm or so, but not less than 25mm, after that then use rubber roller for rolling, the number of times 1-2 times, and finally will be the asphalt concrete paved on it will be crushed into shape.

In short, the rapid development of science and technology has greatly promoted the development of China's highway construction. In order to let the high quality of China's highway construction is guaranteed, highway construction gradually began to apply some new technologies and new techniques, which is very favorable to the future construction of highways. In order to better apply these new technologies and techniques in China's highway construction, it is important to control the management of highway construction, and further strengthen the quality control and management of each stage of construction.

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