Brief introduction to the construction of Ninghuai Expressway?

The construction of Ninghuai Expressway adheres to maximum economy, maximum utilization and maximum recovery, effectively protects non-renewable land resources and actively explores the sustainable development of traffic construction. Zhong Da Consulting made the following related introduction on the construction land of Ninghuai Expressway.

Intensive land use

Reduce subgrade and replace road with bridge.

Nanjing Jiangbei Section of Ninghuai Expressway passes through hilly, hilly and plain areas. In order to minimize land expropriation, two guiding ideology have been established in route design. First, reduce the height of embankment as much as possible to save land; The second is to design the route selection, consciously use hills and hills, neither occupy fertile land, but also make full use of the soil sources of hills and hills to realize the balance of subgrade filling and excavation, thus reducing the land requisition of borrow pits and spoil sites. Due to the appropriate increase of excavation section, although two separated interchanges across the main line were added, the land acquisition was reduced.

In addition, because Nanjing section of Ninghuai Expressway is located in the suburb of Nanjing, it needs to cross rivers such as Beijing-Shanghai, Ningqi Railway, National Highway 104, Macha River, Chuhe River, etc., so the design concept of "replacing roads with bridges" is determined in the planning, because it can not only reduce the road area, but also cancel the high-filled subgrade, which can greatly reduce the requisition of borrow pits. According to this design concept, there are 33 large and medium-sized bridges in the whole line, including 6 extra-large bridges with a length of 17.9 19 km, accounting for 25% of the total length of the line.

The borrow pit is dug into a reservoir and a culture pond.

During the construction of Ninghuai Expressway, new rural construction was vigorously carried out throughout the country. Nanjing Expressway Construction Headquarters formed an understanding during the land acquisition negotiations with the local government, and it is necessary to organically combine the project construction with the new rural construction and do its best to serve "agriculture, countryside and farmers".

Because of the high terrain, the water shortage in Ningma Yong section of Ninghuai Expressway has been puzzling people in Chengqiao and Zhu Zhen. On the basis of full consultation with villagers, all construction units actively combine engineering soil with farmland water conservancy construction. When the land of the pit is requisitioned, the depth of the pit is determined according to the requirements of the villagers. Generally speaking, the soil depth of aquaculture ponds is about 2 meters, and the soil depth of reservoirs is about 4 meters.

Only the fourth bid section of Ninghuai Expressway Yongma has excavated 9 reservoirs for water-deficient villages in Zhu Zhen, with an area of about 6,543,800 cubic meters. Local villagers have realized their dream of "looking forward to water" for many years without spending a penny. According to statistics, more than 5,000 mu of land has been expropriated in Nanjing Ma Yong section of Ninghuai Expressway, of which about 2,000 mu has become dozens of breeding ponds and reservoirs.

In addition, due to the needs of engineering construction, more than 65,438+00 electric irrigation stations and diversion gates need to be relocated and rebuilt. Nanjing Expressway Construction Headquarters combined with the local government's water conservancy planning for new rural construction, rearranged and upgraded the water conservancy facilities to make them more reasonable and efficient. The construction unit also used the mechanical advantages to help the resident towns to change channels and merge small electric irrigation stations, which not only reduced the site area, but also improved the irrigation and drainage capacity.

During the construction period, nearly 100 kilometers of construction access roads were built along the entire line of Ninghuai Expressway. After nearly two years of rolling and renovation, the quality of these sidewalks is very good. After the subgrade construction, the construction unit should fully solicit the opinions of local towns and villagers, change the required reserved access roads into rural roads, and use the construction machinery that has not been handed over for timely repair. Waste materials can be used as deep fillers in borrow pits, and then cultivated with soil to make them arable land, or used as fillers for rural highway subgrade and relocation of farmers' homes. According to incomplete statistics, about 70% of engineering access roads have become rural roads.

Only after the reclamation project is completed can the site be recovered.

There is no doubt that the construction of the project will inevitably cause some damage to the surrounding ecology, especially the temporary construction facilities, material storage yard, prefabrication yard and mixing building mostly occupy farmland and mountains. In order to restrain the construction behavior that damages the environment and enhance the awareness of land protection, Nanjing Expressway Construction Command issued the Guiding Opinions on Environmental Protection during Construction at the beginning of construction, and implemented the "mortgage system for environmental protection and land reclamation", in which the land reclamation deposit was 2,500 yuan per mu. The construction unit must put forward specific protective measures when reporting the organization's construction design, and shall not start work if it fails to pass the examination. After the completion of the project, all units must carry out ecological restoration or re-cultivation of borrow pits and temporary land to the maximum extent, and local farmers can only retreat from the fields after they are satisfied. For this reason, the Nanjing Expressway Construction Command conducted three general surveys on the off-line projects and the restoration of land occupation involving the people's production and life before the end of the main line subgrade, bridge engineering and pavement engineering and before the handover and acceptance, and all the problems found were rectified in time.

During the construction of Laoshan Tunnel, the exit occupied nearly 100 mu of mountain area as a stone processing factory. After the completion of the project, all the trees and grasses in the mountainous area of 100 mu will be restored to green, and the ecological landscape effect of "originating from nature and blending with nature" will be realized.

The above is the introduction of Zhong Da Consulting on the construction land of Ninghuai Expressway. If you want to know more about highways, please pay attention to the architectural knowledge column of Zhong Da Consulting.

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