With the continuous improvement of the national economic level, the number of private cars is also increasing, which greatly increases the traffic volume and highway pressure. Although many expressways have been built in China, after a period of use, the damage phenomenon has become more and more serious, which has greatly affected the normal traffic of vehicles and the probability of traffic accidents has gradually increased. At present, with the rapid development of science and technology, in order to prolong the service life of roads and improve the quality of roads, various new technologies and new processes have appeared one after another, and they have been applied to highway construction by using their respective advantages, which not only makes up for the defects of roads, but also ensures the transportation quality.
First, new technologies and processes in highway construction.
(A) kerb slip-form construction technology
In the actual road construction, kerbs may be located between the roadbed on both sides of the road, or between the median and the road surface. The main purpose of setting this part is to protect the road surface and make the cleanliness of the whole road surface meet the relevant requirements. The kerb slip film construction technology is to use the electronically controlled hydraulic kerb slip film paver for slipform paving construction [1]. Due to the adoption of the hydraulic-driven kerb slipfilm paver, it can not only greatly improve the paving efficiency, but also save materials to the maximum extent, and most importantly, ensure the smoothness of the straight-line operation surface, so it is widely used in today's highway construction.
Flexible grass-roots technology
In the past, when dealing with subgrade diseases in highway engineering, such measures were taken, that is, when determining subgrade diseases, the original base was removed, and on this basis, the semi-rigid base and asphalt surface were reprocessed. This treatment takes a long time, and subsequent maintenance work is needed after treatment, which is easy to block traffic and reduce the transportation effect of expressway. As a result, flexible base technology began to appear, that is, using asphalt upper layer, middle layer and flexible base to treat diseases. On the one hand, it can improve the subgrade structure, on the other hand, it can avoid the phenomenon that cracks concentrate and diverge upward due to subgrade stress concentration. Theoretically, the main component of flexible base is asphalt, which has good drainage performance, so there is no need to worry about a lot of water residue during construction.
(3) Cold recycling technology of foamed asphalt
Compared with traditional hot asphalt, the cold recycling technology of foamed asphalt is obviously different, and its steps do not involve drying aggregate and heating aggregate. In other words, before the realization of foamed asphalt, normal temperature water needs to be injected into it, and then under the action of warm water, hot asphalt will expand thermally, and eventually a lot of foams will be produced and cracked. After cracking, foamed asphalt is composed of many small particles. When it meets aggregate, it penetrates into the cracks of aggregate, and then the aggregate will become a highly stable fine filler with asphalt cracks. It is often used to increase the thickness, generally used in pavement base and asphalt under the layer. Ensuring the rationality of recycling mixture ratio is the key to the application of foam asphalt cold recycling technology. If the ratio is not appropriate, the joint filling will be greatly affected, and the practical significance of this technology will be lost.
(4) * * * vibrating gravel technology
In highway construction, * * * vibroflotation is a new technology, which can reduce the project cost to a certain extent. This technology can repair the concrete pavement well and prevent the pavement from being deformed due to uneven stress when it is put into use. * * * Vibrating macadam technology can accelerate the whole construction process, make the operation more efficient and fast, and ensure the good drainage function of the pavement. It is difficult for traditional technology to eliminate the discharge cracks on the expressway, but the vibrating macadam technology can do it, thus minimizing the damage to the pavement.
Second, the specific application of new technology and new technology in construction
(A) the application in subgrade construction
The subgrade filling pressure is very strict, and the next step of construction can only be carried out after reaching the standard. When the standard requirements cannot be met, rescue measures include mixing coarse-grained materials, lime and other materials. At the same time, new technologies such as geosynthetics reinforcement, lime-soil compaction pile and light embankment can effectively compact subgrade. The traditional practice is to use a large-tonnage roller for construction. Only by compacting the subgrade can the pavement be uniformly stressed to avoid unevenness after the pavement is put into use. In the construction of soft soil pavement, the working procedure is to lay soil first and then build embankment. Using advanced measures to build the upper layer of soft soil layer can not only stabilize the pavement, but also ensure normal drainage. Geotextiles are usually used.
(2) Application in pavement construction
At present, there are mainly two kinds of highway pavements in China: cement concrete pavement and asphalt pavement, but the former is slightly weaker than the latter in construction technology, equipment level and stability. It is difficult for cement concrete pavement to meet the relevant standards in terms of panel density and material uniformity. Because manpower is the main force of cement concrete pavement, it is difficult to effectively solve some precision and detail problems needed in building engineering, which is easy to damage cement concrete pavement and affect its stability. The use of slip film construction technology can improve the judgment that cement concrete pavement is not stable enough.
(3) Application in pavement maintenance
This technology is often used in the process of large-scale highway repair, and the effect is very obvious. The specific requirements are as follows: in the process of laying fiber geogrid by fixing method, nails and iron sheets need to be fixed on the substructure paved with bonded asphalt, and then the geogrid is tensioned longitudinally and expanded and fixed in sections; * * * The overlapping distance of the grid should be controlled in horizontal overlapping 10 ~ 15cm and vertical overlapping10 ~ 20 cm; In the process of fixing, you can't nail the glass fiber, and you can't beat the glass fiber with a hammer. If a broken nail is found, it should be repaired as soon as possible. After the fixing is completed, it needs to be properly rolled by rubber-tyred roller to make the I-shaped grid firmly attached to the original road surface; In addition, asphalt concrete must be laid on the I-beam on the day of fixing and rolled by a press.
Conclusion:
In a word, the rapid development of science and technology has greatly promoted the development of highway construction in China. In order to ensure the high quality of highway construction in China, some new technologies and new processes are gradually applied in highway construction, which is very beneficial to future highway construction. In order to better apply these new technologies and new processes in China's highway construction, it is necessary to do a good job in the control and management of highway construction and further strengthen the quality control and management at all stages of engineering construction.
This paper introduces the content of "new technology and new technology of highway construction". Welcome to Zhong Da for more information.
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