New and old subgrade splicing technology and equipment

Abstract

The invention discloses a new and old subgrade splicing technology. The new and old subgrade splicing technology comprise the following steps that 100, a slope of an old subgrade is cleared, and meanwhile, overbreak of a spliced wide surface step is conducted; 200, a first stripping layer is constructed on a base cushion layer of the old subgrade, a first anchor blocking block is arranged on the first stripping layer, a first tension blocking block is arranged a base cushion layer of a new subgrade, a broken stone discharging cushion layer serves as a subgrade bottom slope surface, and a steel-plastic geogrid is arranged between the anchor blocking block and the tension blocking block; 300, a steel floral tube and a steel cable combined piece are placed on a mixed rigid layer; 400, a second stripping layer is constructed in the direction of the mixed rigid layer, a second anchor blocking block is arranged on the second stripping layer, a second tension blocking block is arranged on themixed rigid layer of the new subgrade, and a plastic geogrid is laid between the second anchor blocking block and the second tension blocking block; and 500, a rubber stress absorbing layer is arranged, a third stripping layer is constructed in the direction of a face layer of the old subgrade, and a three-dimensional honeycomb mesh layer is laid. According to the new and old subgrade splicing technology, firm splicing of the new and old subgrades can be effectively conducted.

Description

technical field [0001] The invention relates to the field of roadbed splicing, in particular to a new and old roadbed splicing process and equipment. Background technique [0002] In a broad sense, the splicing and reconstruction of old roads is to improve the traffic bearing capacity of a traffic corridor to meet the growing traffic demand. In a narrow sense, it is to improve the vehicle traffic capacity of the road. In recent years, with the rapid development of the economy, the urbanization process has accelerated significantly, the population has accelerated to gather in cities and towns, and the road traffic volume has increased. In particular, the road traffic volume forecast in the early planning and design was insufficient, and some early-built roads have become more and more incapable To meet the demand of increasing traffic volume, some old roads show a trend of saturation or super-saturated traffic situation, and the traffic capacity cannot meet the needs of rapid...

AI Technical Summary

Problems solved by technology

[0006] (1) During the reconstruction of the old road, the spliced ​​road is different from the original road in terms of consolidation methods, foundation treatment, construction technology, and filler type. After years of operation, the settlement of the old road has been basically completed. Road and vehicle loads will inevitably cause additional settlement of the old road, which will lead to uneven settlement between the new and old roads, which will cause deformation of the joint between the old and new roads, and cracks and other diseases in severe cases;

[0007] (2) In terms of the number of layers of geotechnical materials laid, the inconsistency of the position and the depth of research, there is a big difference between the effect of geotechnical materials used in the splicing of new and old roads and the effect of theoretical engineering construction, and the settlement of the junction between the new roadbed and the old roadbed If the compensation measures are not well-taught construction measures, it can only be remedied through engineering and technical measures such as continuous reinforced cushion and reinforced embankment, geotextile anti-seepage and drainage in the later stage, which will affect the firmness of the splicing joint;

[0008] (3) When the new subgrade and the old subgrade are over-excavated to form the wide-faced steps, the previous slope-clearing operations are all asynchronous construction, so that during the foundation-building process, the step slopes on both sides form different stress-tension structures. At the same time, the slope dikes on both sides of the old subgrade have changed over a long period of time, and the angles of the slope dikes on both sides are different, which has caused certain difficulties in excavating and clearing the slope, thus affecting the laying of the new subgrade base.

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