A road ecosystem

Abstract

The present invention discloses a road ecosystem, including a road, which is configured to have several functional zones in the width direction, and at least some of the adjacent functional zones have green isolation zones; the bottom of the road has at least one drainage culvert; at least some of the green isolation zones have a first storage space isolated from the road, and the first storage space is connected to the drainage culvert through a pipeline; the first storage space is filled with contaminated soil, and vegetation is planted on the contaminated soil. This technology can place contaminated soil in the first storage space and plant vegetation on the contaminated soil, and can adsorb harmful substances in the contaminated soil; at the same time, because the first storage space is connected to the drainage culvert, when the contaminated soil is soaked in water, the toxic substances dissolved in the water will flow into the drainage culvert together with the water to avoid pollution to the surrounding environment; and achieve the effect of ecological environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of roads, in particular to a road ecosystem. Background Art

[0002] The general road design includes lanes, sidewalks, non-motorized vehicle lanes and green belts set between adjacent functional roads. Various vegetation is planted in the green belts. Traditional vegetation planting directly lays soil in the isolation trough and then plants vegetation. On rainy days and after watering, water will seep into the ground.

[0003] As we all know, the current main methods of urban garbage disposal are landfill or garbage incineration power generation. However, with the increasing amount of urban garbage, garbage incineration will cause serious air pollution; landfill requires a large area of ​​urban land and pollutes the land and groundwater. With the increasing scarcity of urban land, landfilling has become very inappropriate and not environmentally friendly.

[0004] Therefore, many garbage disposal technologies have emerged, such as sorting various types of garbage and then recycling the sorted different types of garbage. It should also be noted that since there is often a lot of soil in the garbage, especially some landfills that have been buried underground for a long time, when they are discovered, these garbage need to be processed. For example, in some subway stations and construction sites, there are often many old solid waste garbage buried, which contains a lot of soil, and this soil is often contaminated by these solid waste garbage. When cleaning these garbage, the screened soil is often directly piled on the open land or needs to undergo specific purification treatment. Direct stacking will pollute water resources, and specific purification treatment will increase the cost of garbage disposal.

[0005] Therefore, a new technology is needed to solve the above-mentioned technical problems. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the present invention proposes a road ecosystem, which aims to combine the soil obtained from garbage sorting with road design to achieve purification of contaminated soil.

[0007] In order to solve the above technical problems, the basic technical solution proposed by the present invention is:

[0008] A road ecosystem comprises a road, wherein the road is configured to have a plurality of functional zones in a width direction, and at least some adjacent functional zones are provided with green plant isolation zones;

[0009] The bottom of the road has at least one drainage culvert;

[0010] At least part of the green isolation belt has a first storage space isolated from the road, and the first storage space is connected to the drainage culvert through a pipeline;

[0011] The first storage space is filled with contaminated soil, and vegetation is planted on the contaminated soil.

[0012] Furthermore, part of the first receiving space is provided with a flower pot, the bottom of the flower pot has a through hole connected to the first receiving space, the flower pot is filled with the contaminated soil, and vegetation is planted on the contaminated soil.

[0013] Furthermore, a blocking device is provided at the junction of the first receiving space and the pipeline.

[0014] Furthermore, the functional zone includes a pedestrian passage, and a pavilion for pedestrians to rest is arranged at the green isolation belt on one side of the pedestrian passage. Under the pavilion is a second storage space isolated from the road, and the second storage space is filled with the contaminated soil, and the contaminated soil is covered with lawn.

[0015] Furthermore, fruit trees are planted in the area surrounding the pavilion.

[0016] Furthermore, the pipeline of each individual green isolation belt is connected to a main pipeline, and the main pipeline is connected to a branch pipe at a certain interval, and the branch pipe is connected to a water purification device buried under the road, and the output end of the water purification device is connected to the drainage culvert.

[0017] Furthermore, the road is formed by tightly stacked solid waste ecological bricks.

[0018] Furthermore, each of the solid waste eco-bricks has a through hole arranged along the length direction, and the through holes of the solid waste eco-bricks on the same layer arranged along the length direction are connected front to back to form a pipeline corridor for laying the city's seven-way and one-level line.

[0019] The beneficial effects of the present invention are:

[0020] The technical solution of the present invention is a road ecosystem, including a road, which is configured to have several functional zones in the width direction, and at least some of the adjacent functional zones have green isolation zones; the bottom of the road has at least one drainage culvert; at least some of the green isolation zones have a first storage space isolated from the road, and the first storage space is connected to the drainage culvert through a pipeline; the first storage space is filled with contaminated soil, and vegetation is planted on the contaminated soil. This technology can place contaminated soil in the first storage space and plant vegetation on the contaminated soil, and can adsorb harmful substances in the contaminated soil; at the same time, because the first storage space is connected to the drainage culvert, when the contaminated soil is soaked in water, the toxic substances dissolved in the water will flow into the drainage culvert together with the water to avoid pollution to the surrounding environment; achieving the effect of ecological environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a road ecosystem of the present invention;

[0022] Figure 2 This is a structural diagram of a drainage culvert;

[0023] Figure 3 This is a schematic diagram of the structure of the green isolation belt;

[0024] Figure 4 This is a schematic diagram of the structure of the built-in flower tray in the first storage space;

[0025] Figure 5 This is a structural diagram of the pavilion and the green plant isolation belt;

[0026] Figure 6 It is a schematic diagram of the pipeline laying structure;

[0027] Figure 7 Schematic diagram of a road paved with solid waste eco-bricks;

[0028] Figure 8 This is a schematic diagram of the structure of solid waste eco-bricks;

[0029] Fig. 9 This is a schematic diagram of the structure of solid waste eco-bricks;

[0030] Fig.10 A schematic diagram of the structure set up for the third channel;

[0031] Description of reference numerals:

[0032] 1-road, 11-functional zone, 111-sidewalk, 112-driving lane, 113-non-motorized vehicle lane, 121-first storage space, 122-pipeline, 2-drainage culvert, 21-drainage pipe, 22-drainage hole, 3-contaminated soil, 4-flower plate, 5-barrier device, 6-pavilion, 61-second storage space, 62-second pipeline, 123-main pipeline, 124-branch pipe, 7-water purification device. DETAILED DESCRIPTION

[0033] The following will be combined with the attached Figure 1 To Attachment Fig.10 The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that the directions involved in the embodiments of the present invention shall be subject to those shown in the drawings. If a certain posture changes, the directional indication will also change accordingly.

[0035] See also Figure 1 The present invention proposes a road ecosystem, including a road 1, wherein the road 1 is configured to have a plurality of functional zones 11 in the width direction, and a green plant isolation zone 12 is provided between at least some adjacent functional zones 11. The plurality of functional zones 11 may include a sidewalk 111, a driving lane 112, and a non-motorized vehicle lane 113. Of course, it is not limited thereto, and it may also include other functional zones, such as a landscape zone.

[0036] See also Figure 1 , this embodiment has at least one drainage culvert 2 at the bottom of the road 1. The drainage culvert 2 is arranged along the length direction of the road 1, and it can eventually be input to a specific production location, for example, the drainage culvert 2 is input to a sewage treatment plant. It should be understood that in this embodiment, the drainage culvert 2 is implemented by a concrete reinforced concrete casting structure, which is beneficial to improve the strength of the drainage culvert 2. Among them, the cross-sectional shape of the drainage culvert 2 can be square or arc-shaped, and preferably a square structure is adopted for the convenience of processing and design. Among them, it should be noted that in some other embodiments, the drainage culvert 2 can adopt a method of alternating drainage pipes and drainage holes, see Figure 2, that is, the drainage culvert 2 includes a drainage pipe 21 and a drainage hole 22 arranged alternately, and the drainage hole adopts a reinforced concrete structure, that is, this embodiment can not adopt a full-section reinforced concrete design, which is conducive to reducing costs and construction difficulties. Among them, the drainage hole 22 is designed with reinforced concrete, and its size is designed to be large enough to facilitate personnel to enter for cleaning, for example, its inner cavity size is 2 meters x 2 meters x 2 meters. Of course, an inlet and outlet passage 23 connected to the drainage hole 22 is set from the road surface of the road 1 at intervals on the road, so as to facilitate maintenance personnel to enter and exit the drainage hole 22.

[0037] like Figure 1 and Figure 3 , at least part of the green plant isolation belt 12 has a first storage space 121 isolated from the road 1, and the first storage space 121 is connected to the drainage culvert 2 through a pipe 122; the first storage space 121 is filled with contaminated soil 3, and vegetation is planted on the contaminated soil 3. That is, in this embodiment, the first storage space 121 formed by the green plant isolation belt 12 is isolated from the road, which can prevent the water at the green plant isolation belt 12 from flowing to the road, and directly guide the excess water to the drainage culvert 2 through the pipe 122. In this embodiment, since the contaminated soil 3 contains pollutants such as heavy metals, the structural design of the isolated first storage space 121 and the drainage culvert 2 ensures that the water soaked in the contaminated soil 3 will not flow out to the road 1 or the outside space, which can reduce pollution; and by planting vegetation on the contaminated soil 3, the heavy metal ions in the contaminated soil 3 are absorbed by the vegetation, so as to achieve the effect of purifying the contaminated soil 3. Of course, in this embodiment, the vegetation preferably has the function of absorbing heavy metals, and different types of vegetation can be mixed to absorb different toxic substances. That is, by connecting the first receiving space 121 with the drainage culvert 2, the water entering the first space 121 will not diffuse to the surrounding environment, but will only flow into the drainage culvert 2 along the pipeline flow channel, thus avoiding the pollution of the surrounding environment by the contaminated soil.

[0038] In detail, the first storage space 121 is formed by the road surface of the road 1 being sunken downward or is higher than the road surface of the road 1 and sunken downward. The surrounding side of the first storage space 121 is isolated from the road 1. Specifically, a waterproof layer is provided on the surrounding side of the first storage space 121 to achieve isolation from the road 1 and prevent water seepage. For example, the isolation layer can be formed of cement. The first storage space 121 can be set to various shapes, which can be regular or irregular, such as cylindrical, cubic, hemispherical, etc.

[0039] In this embodiment, the contaminated soil 3 is the existing soil contaminated by heavy metals, that is, the technical solution of the present invention is connected with the drainage culvert 2 through the first storage space 121, so that when the contaminated soil 3 is soaked with water, the water is discharged to the drainage culvert 2 to avoid pollution to the surrounding environment. Planting vegetation in the first storage space 121 is conducive to the purification of the contaminated soil 3. Among them, the contaminated soil 3 can be soil garbage obtained by sorting waste garbage. When the specific sorting method of obtaining the contaminated soil by sorting waste garbage is: put solid waste garbage into a rotary screening machine; the rotary screening machine rotates, and the mud and sand mixed in the solid waste garbage are screened out through the screen. The contaminated soil 3 is obtained by sorting waste garbage through the screening machine. In the specific operation, the screening machine rotates continuously, and the solid waste is transmitted to the screening machine by the transmission mechanism of the screening machine, and is continuously turned over in the screening machine, and the soil is exposed from the screen. And in the process of continuous rotation of the screening machine, large-sized soil will also be broken into small particles and exposed from the screen. Preferably, the mesh size of the screen is between 5-15 mm. It should be noted that the core of the present invention is not how to sort the contaminated soil, but to provide a road ecosystem that can meet the laying of contaminated soil and avoid these contaminated soils from polluting the surrounding environment of the road. Therefore, it cannot be considered that the disclosure of the present invention is insufficient because the specific components of the contaminated soil cannot be determined.

[0040] In some embodiments, Figure 4 As shown, part of the first receiving space 121 is provided with a flower pot 4, and the bottom of the flower pot 4 has a through hole connected to the first receiving space 121, and the polluted soil 3 is filled in the flower pot 4, and vegetation is planted on the polluted soil 3. That is, in some embodiments, the polluted soil 3 is not directly filled in the first receiving space 121 and vegetation is planted, but the flower pot 4 is placed in the first receiving space 121, and then the polluted soil 3 is filled in the flower pot 4, and finally vegetation is planted. That is, the vegetation is planted in the first receiving space 121 through the flower pot 4. It should be understood that the number of flower pots 4 in a first receiving space 121 is set according to different sizes. It is very important that there is a through hole (not shown in the figure) at the bottom of the flower pot 4, which is connected to the first receiving space 121. When enough water accumulates in the flower pot 4, the water can flow into the first receiving space 121 through the bottom and flow along the pipe 122 into the drainage culvert 2. By adopting this technology, it is possible to directly arrange green plants in the first storage space 121 in the green plant supplier, without filling the contaminated soil 3 and then planting the plants. This technology is particularly suitable for the display of plants with specific shapes. That is, the green plant pots can be directly arranged in the first storage space 121 in the supplier.

[0041] In addition, in order to prevent impurities such as soil in the first storage space 121 from clogging the pipeline 122, a blocking device 5 is provided at the junction of the first storage space 121 and the pipeline 122. The blocking device 5 can be implemented using existing isolation technology, such as an isolation net, to prevent large-sized objects from flowing into the pipeline 122 and causing clogging.

[0042] In detail, the functional belt 11 includes a pedestrian passage 111, and the pedestrian passage 111 is specifically set on both sides of the road 1, wherein a pavilion 6 for pedestrians to rest is set at the green plant isolation belt 12 on one side of the pedestrian passage 111, and a second storage space 61 is provided under the pavilion 6, which is isolated from the road 1, and the second storage space 61 is filled with the contaminated soil 3, and the contaminated soil 3 is covered with lawn. That is, in this technical solution, a pavilion 6 is set at a certain distance on the pedestrian passage 111 of the road 1 for pedestrians to rest, thereby increasing the function of the urban road. The second storage space 61 is formed by the green plant isolation belt 12 being concave downward, and the second storage space 61 is also filled with contaminated soil 3, and vegetation is planted on the contaminated soil 3. Through this design, more contaminated soil 3 can be accommodated on the premise of increasing the function of the road 1, so as to process more solid waste garbage, and achieve the effect of environmental protection and ecology. Similarly, the second storage space 61 is also isolated from the road 1, that is, the water and the contaminated soil 3 in the second storage space 61 do not contact other parts of the road, and will not penetrate, ensuring that the contaminated soil 3 does not affect the surrounding environment. Of course, the shape of the second storage space 61 can also be set to a variety of different shapes, which can be regular or irregular.

[0043] In some embodiments, in order to improve the landscape viewability of the road, fruit trees and flowering plants are planted in the surrounding area of ​​the pavilion 6 for people in the pavilion 6 to enjoy.

[0044] See also Figure 5 Preferably, the second receiving space 61 in the pavilion 6 is also connected to the drainage culvert 2 through a second pipe 62, so that the water that has infiltrated into the second receiving space 61 can be discharged into the drainage culvert 2 to prevent it from flowing to the surrounding area due to overflow.

[0045] Through this technical solution, pavilions are set up in the green isolation belt 12, and fruit trees and flowering plants are planted, which increases the ecological landscape of the entire road and serves as a small park to a certain extent, providing a place for citizens to relax and play.

[0046] Furthermore, in some embodiments, in order to avoid each pipe 122 connected to the first receiving space 121 being directly buried and extended to the drainage culvert 2, which causes cumbersome pipe laying and increased costs, in this embodiment, the pipe 122 of each individual green plant isolation belt 12 is connected to a main pipe 123, and the main pipe 123 is connected to a branch pipe 124 at a certain interval, and the branch pipe 124 is connected to a water purification device 7 buried under the road 1, and the output end of the water purification device 7 is connected to the drainage culvert 2, such as Figure 6 As shown. That is, the pipe 122 of each first receiving space 121 is connected to the main pipe 123, and the main pipe 123 collects the water flowing out of each first receiving space 121 uniformly, and the collected wastewater is backflowed into the drainage culvert 2 through a branch pipe 124 at a certain distance. Specifically, a branch pipe 124 is set every 100 meters to realize the connection between the main pipe 123 and the drainage culvert 2, so as to achieve effective drainage. Specifically, the wastewater from the first receiving space 121 can be purified and discharged into the drainage culvert 2 through the water purification device 7, which can play the role of early purification. Among them, the water purification device 7 is implemented by a well-known heavy metal ion purification device, which is not described in detail here, but it should not be considered that the disclosure of this technology is insufficient. With this technology, the water purified by the water purification device 7 can be recycled, for example, the drainage culvert 2 is connected through a pipeline, and the drainage culvert 2 is pumped out by a water pump for watering the green plant isolation belt 12 on the road 1. In other specific applications, the motor vehicle lane of the road 1 can also be connected to the drainage culvert 2 through a pipeline to flow rainwater back into the drainage culvert 2. Similarly, the pipeline connecting the motor vehicle lane can also be connected to a water purification device to discharge the introduced water into the drainage culvert 2 after purification, thereby realizing rainwater recycling.

[0047] Of course, it should be noted that a sewage culvert can also be set up under the road 1, and the sewage culvert is connected to a number of first discharge pipes, and the first discharge pipes extend to the industrial sewage ditches on both sides of the road 1 to collect industrial sewage and separate rainwater and sewage. Similarly, a domestic sewage discharge culvert can also be set up underground on the road 1, and the domestic sewage discharge culvert is connected to a number of second discharge pipes, and the second discharge pipes extend to the domestic sewage discharge ditches on both sides of the road to flow domestic sewage back to the third domestic sewage discharge culvert, so as to realize the centralized collection and discharge of domestic sewage. This technology avoids the mixing of industrial wastewater, rainwater and domestic sewage, and facilitates the subsequent purification of different sewage.

[0048] See also Figure 7, the road 1 of the present invention is formed by tightly stacked solid waste eco-bricks 13. That is, the road 1 of the present invention is formed by assembling modular solid waste eco-bricks 13, and the entire road 1 is assembled from solid waste eco-bricks 13. Specific areas are divided at the top of the assembled structure as the sidewalk 111, the carriageway 112 and the non-motorized vehicle lane 113. Specifically, during the specific assembly, each solid waste eco-brick 13 is in close contact with the adjacent solid waste eco-bricks 13. And in the present embodiment, multiple layers of solid waste eco-bricks 13 are arranged, and each layer of solid waste eco-bricks 13 is assembled in sequence by multiple solid waste eco-bricks 13 along the length of the road.

[0049] Among them, it should be understood that the solid waste eco-brick 13 described in this embodiment has sufficient strength and pressure bearing capacity. Specifically, the pressure bearing capacity of the solid waste eco-brick 13 meets the pressure bearing strength of the existing concrete road. The solid waste eco-brick 13 can be implemented by using the existing modular eco-brick 13 made of solid waste as one of the raw materials. For example, the solid waste can include one or more of domestic garbage solid waste, industrial garbage solid waste, construction waste solid waste, stale garbage solid waste in landfills, water plant solid waste, sewage treatment plant solid waste, and river management solid waste. This design can integrate garbage into the solid waste eco-brick 13, achieve the effect of treating garbage, reduce the existing amount of urban garbage, and then solve the technical problems such as large land area occupied by garbage and air pollution caused by garbage incineration. The above description is only for the purpose of explaining the type of solid waste eco-brick 13, and explaining that it is an existing eco-brick containing solid waste components. It cannot be considered that the structure and components of the solid waste eco-brick 13 are not described in detail and do not meet the requirements of full disclosure; because the solid waste 13 in this technical solution is realized by existing known technology. Among them, the size of the solid waste eco-brick 13 can be a cubic structure of 1 meter × 1 meter × 1.5 meters.

[0050] See also Figure 8 and Fig. 9In other embodiments, each of the solid waste eco-bricks 13 has a through hole 131 arranged along the length direction, and the through holes 131 of the solid waste eco-bricks 13 on the same layer arranged along the length direction are connected front and back to form a pipe gallery channel 14 for laying the city's seven-way and one-level line. That is, according to the length direction, different solid waste eco-bricks 13 are laid along the length direction and the corresponding through holes 131 are connected to form the pipe gallery channel 14. Since each solid waste eco-brick 13 has at least one through hole 131, the number of pipe gallery channels 14 in the cross-sectional direction is at least the same as the number of solid waste eco-bricks 13, and each pipe gallery channel 14 can be used to lay a municipal pipeline, such as laying cables. This facilitates the laying of the municipal seven-way and one-level line, and there is no need to dig different deep grooves in the road 1 to lay pipelines.

[0051] At the same time, it should be understood that see Fig.10 For the part of the seven-way and one-level pipe gallery passage 14, a third passage 15 for personnel to enter and exit is set at a certain interval (for example, 100 meters or 200 meters) along the length direction of the road 1, and the third passage 15 is formed by extending downward from the upper surface of the road 1. Specifically, the third passage 15 is formed by two solid waste ecological bricks 13 arranged at intervals in the front and rear along the length direction, so that different layers of solid waste ecological bricks 13 are staggered and laid at the same position to form the third passage 15, which is convenient for personnel to enter and exit to realize the laying, maintenance, replacement and other operations of the seven-way and one-level pipeline.

[0052] In summary, the technical solution of the present invention can lay the contaminated soil 3 in the first receiving space 11 and the second receiving space 61, and purify the contaminated soil 3 by planting vegetation, reduce the cost of solid waste disposal process, and can accommodate and reuse enough contaminated soil 3 in large quantities, which can not only solve the problem of urban and rural landfills polluting water and soil and occupying land; urban garbage incineration power generation pollutes the air, harms the public environment, and affects people's life safety; it can save urban and rural land, optimize the air environment, save resources, and optimize the circular development of urban and rural road investment environment, reduce rain and sewage disasters, and save raw materials and construction costs. In addition, it is very important that the water of the contaminated soil 3 can be discharged into the drainage culvert 2 by connecting the first receiving space 11 and the second receiving space 61 with the drainage culvert 2, so as to avoid the contaminated soil from polluting the surrounding environment of the road.

[0053] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A road ecosystem, comprising a road (1), wherein the road (1) is configured to have a plurality of functional zones (11) in a width direction, and at least some adjacent functional zones (11) are provided with green plant isolation zones (12), characterized in that: The bottom of the road (1) has at least one drainage culvert (2); At least part of the green plant isolation belt (12) has a first storage space (121) isolated from the road (1), and the first storage space (121) is connected to the drainage culvert (2) through a pipeline (122); The first storage space (121) is filled with contaminated soil (3), and vegetation is planted on the contaminated soil (3); The pipeline (122) of each individual green plant isolation belt (12) is connected to a main pipeline (123), and the main pipeline (123) is connected to a branch pipe (124) at a certain interval, and the branch pipe (124) is connected to a water purification device (7) buried under the road (1), and the output end of the water purification device (7) is connected to the drainage culvert (2); the water purification device (7) is implemented by heavy metal ion purification equipment.

2. A road ecosystem as claimed in claim 1, characterized in that: A portion of the first receiving space (121) is provided with a flower disc (4), the bottom of the flower disc (4) having a through hole connected to the first receiving space (121), the flower disc (4) is filled with the contaminated soil (3), and vegetation is planted on the contaminated soil (3).

3. A road ecosystem as claimed in claim 2, characterized in that: A blocking device (5) is provided at the junction of the first receiving space (121) and the pipeline (122).

4. A road ecosystem as claimed in claim 1, characterized in that: The functional zone (11) comprises a pedestrian passage (111), and a pavilion (6) for pedestrians to rest is arranged at a green plant isolation zone (12) on one side of the pedestrian passage (111). A second storage space (61) is provided under the pavilion (6) and is isolated from the road (1). The second storage space (61) is filled with the contaminated soil (3), and the contaminated soil (3) is covered with lawn.

5. A road ecosystem as claimed in claim 4, characterized in that: Fruit trees are planted in the area surrounding the pavilion (6).

6. A road ecosystem as claimed in claim 1, characterized in that: The road (1) is formed by tightly stacking solid waste ecological bricks (13).

7. A road ecosystem as claimed in claim 6, characterized in that: Each of the solid waste eco-bricks (13) has a through hole (131) arranged along the length direction, and the through holes (131) of the solid waste eco-bricks (13) arranged in the same layer along the length direction are connected front to back to form a pipe gallery channel (14) for laying a seven-way and one-level line in the city.

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