Patent ID: 12247359

The thick solid line in the drawing is the lane edge, which defines the design scope of drainage; the thin solid curve is the contour line, which describes the three-dimensional coordinates of the road surface; the dotted line is the watershed, which is the characteristic line of the road surface topography; the arrow is the direction of water flow, and the single arrow inside of the intersection is the direction of the collection of water flow; the single arrow that leaves the intersection and points to the direction of the road section outside of the intersection is not only the water flow direction but also the blocked water flow direction of the intersection, that is, the direction of the water accumulation section; the direction of the double arrow that leaves the intersection and points to the road section outside of the intersection is the set flow direction. The small black filled square in the drawings is the rainwater inlet of the road drainage system, which is arranged at the rainwater inflow end of the intersection.

DESCRIPTION OF THE EMBODIMENTS

The present invention will be further explained with reference to the drawings and examples: Embodiments of the present invention are described in detail below, examples of the embodiments are shown in the accompanying drawings, in which identical or similar reference numerals denote identical or similar elements or elements having identical or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention, and should not be understood as a limit of the present invention.

Embodiment 1

The embodiment provides a road network balanced drainage method aimed at reducing urban waterlogging, including:Step 1: determining a water accumulation section; specifically: (1) determining the waterlogged road section through observation and analysis, or (2) through drawing analysis and on-site observation, the section with the V-shaped longitudinal road surface alignment at the non-intersection is determined as the water accumulation road section.Step 2: taking the intersection at the upstream of the road section where the water accumulation section is located as the first intersection;Step 3: judging if the requirement of flow distribution is met at the first intersection; the conditions for meeting the flow distribution requirements are: in addition to the road where the water accumulation sections are located, one or more longitudinal slope roads are deviating from the intersection (i.e., the terrain of the intersection is high, and the farther away from the intersection, the lower the terrain is), and there is no water accumulation section on the longitudinal slope roads deviating from the intersection.Step 4: carrying out elevation reconstruction at the first intersection if the requirement of flow distribution is met at the first intersection so that the water flowing into the first intersection flows to the road other than the road where the water accumulation section is located; if the requirement of flow distribution is not met at the first intersection, tracing along the water inlet road of the first intersection upwards the second intersection at upstream side;Step 5: judging if the requirement of flow distribution is met at the second intersection;Step 6: carrying out elevation reconstruction at the second intersection if the requirement of flow distribution is met at the second intersection so that the water flowing into the second intersection flows to the road outside of the first intersection; if the requirement of flow distribution is not met at the second intersection, tracing along the water inlet road of the second intersection upwards the third intersection at upstream side;Step 7: judging if the requirement of flow distribution is met at the third intersection;Step 8: carrying out elevation reconstruction at the third intersection if the requirement of flow distribution is met at the third intersection so that the water flowing into the third intersection flows to the road outside of the second intersection; if the requirement of flow distribution is not met at the third intersection, tracing along the water inlet road of the third intersection upwards the fourth intersection at upstream side;

By analogy, judging if the requirement of flow distribution is met at the fourth intersection; if the requirement of flow distribution is met at the fourth intersection, carrying out elevation reconstruction at the fourth intersection so that the water flowing into the fourth intersection flows to the road outside of the third intersection; if the requirement of flow distribution is not met at the fourth intersection, tracing along the water inlet road of the fourth intersection upwards the fifth intersection at upstream side;

Preferably, if the number of the longitudinal slope roads that meet the requirement of flow distribution at the same intersection is greater than or equal to 2, the amount of water entering different longitudinal slope roads can be controlled through elevation reconstruction.

Design principle: take advantage of the characteristic of ‘water flowing to the lower place’, the intersection elevation is set into a landform with ‘watershed’ and ‘gully’. The water flowing to the waterlogged road section is blocked by the ‘watershed’ (‘watershed’ ridge line), and the rainwater entering the intersection is introduced to the preset drainage road section along the ‘gully’ extending from the intersection to the road section. When the water depth in the intersection exceeds the watershed, the water flow entering the intersection begins to split towards the water accumulation road section. According to the different combinations of upstream and downstream intersections, the elevation diagram of the present invention can have various embodiments and is not limited to the listed diagrams. Factors such as driving comfort are the constraints of the elevation design.

Mode 1:FIG.1shows the intersection is in the one-way inlet and three-way outlets state; when it rains, rainwater flows into the intersection from road A and flows out from roads B, C, and D;

After observation and analysis, it is assumed that road D has a water accumulation road section while roads B and C don't have water accumulation road sections. As shown inFIG.2, elevation reconstruction is carried out at the intersection to raise the terrain at one side of the road D of the intersection so that the large flow of rainwater flowing from road A flows out from roads B and C. Reducing or cutting off the amount of rainwater flowing into road D, so as to avoid or reduce the occurrence of waterlogging of road D; elevation reconstruction is to construct a road to be reconstructed according to the requirement of road construction, and watershed (watershed line) is formed on the road, which can make water flow in the pre-designed direction. After observation and analysis, it is assumed that both roads B and D have water accumulation road sections, while road C doesn't have a water accumulation road section. As shown inFIG.3, elevation reconstruction is carried out at the intersection to raise the terrain at one side of the roads B and D of the intersection, and two watersheds are formed so that the large flow of rainwater flowing from road A flows out from road C. Reducing or cutting off the amount of rainwater flowing into roads B and D, so as to avoid or reduce the occurrence of waterlogging of roads B and D;

After observation and analysis, it is assumed that both roads C and D have water accumulation road sections, while road B doesn't have a water accumulation road section. As shown inFIG.4, elevation reconstruction is carried out at the intersection to raise the terrain at one side of the roads C and D of the intersection, and two watersheds are formed so that the large flow of rainwater flowing from road A flows out from road B. Reducing or cutting off the amount of rainwater flowing into roads C and D, so as to avoid or reduce the occurrence of waterlogging of roads C and D;

After observation and analysis, it is assumed that roads B, C, and D have water accumulation road sections, the elevation reconstruction at the intersection will be given up, and trace upstream along road A to the previous intersection for judgement; or even if roads B, C and D all have water accumulation road sections, roads B and D are the most serious, or roads C and D are the most serious, or roads B and C are the most serious, in which case, the elevation drawings as shown inFIGS.3,4and5can be used respectively. Through the elevation reconstruction, less rainwater will flow into the road section with the most serious waterlogging, and more rainwater will flow into the road sections with relatively little water accumulation so that the flow distribution will be more reasonable.

Mode 2:FIG.6shows the intersection is in the single-slope two-way inlets and two-way outlets state. When it rains, rainwater flows into the intersection from A and D and flows out from B and D;

After observation and analysis, it is assumed that road B has a water accumulation road section, while road C doesn't have a water accumulation road section. As shown inFIGS.7and8, elevation reconstruction is carried out at the intersection to raise the terrain at one side of the road B of the intersection, and a watershed is formed so that the large flow of rainwater flowing in will flow out from road C. Reducing or cutting off the amount of rainwater flowing into road B, so as to avoid or reduce the occurrence of waterlogging in road B; bothFIG.7andFIG.8can achieve the function of preventing water flow,FIG.7is suitable for the situation that roads B and D have large slopes, andFIG.8is suitable for the situation that roads B and D have small slopes. According to the different conditions of roads, different forms of the watershed are formed through elevation reconstruction, but the goal is to raise the terrain at one side of road B at the intersection so that the large flow of rainwater flowing in will flow out from road C. Reducing or cutting off the amount of rainwater flowing into road B, so as to avoid or reduce the occurrence of waterlogging in road B.

After observation and analysis, it is assumed that both roads B and C have water accumulation road sections, the elevation reconstruction at the intersection will be given up, and trace upstream along roads A and D respectively to the previous intersection for judgement; or raise the terrain at one side of the roads B and C with the most serious waterlogging during reconstruction so that less rainwater will flow into the roads with the most serious waterlogging.

Mode 3:FIG.9shows the intersection is in the saddle-shaped two-way inlets and two-way outlets state. When it rains, rainwater flows into the intersection from A and C and flows out from B and D;

After observation and analysis, it is assumed that road D has a water accumulation road section, while road B doesn't have a water accumulation road section. As shown inFIG.10, elevation reconstruction is carried out to raise the terrain at one side of the road D of the intersection, and a watershed is formed so that the large flow of rainwater flowing in will flow out from road B. Reducing or cutting off the amount of rainwater flowing into road D, so as to avoid or reduce the occurrence of waterlogging of road D;

After observation and analysis, it is assumed that both roads B and D have water accumulation road sections, the elevation reconstruction at the intersection will be given up, and trace upstream along road A and C respectively to the previous intersection for judgement; or raise the terrain at one side of the roads B and D with the most serious waterlogging during reconstruction so that less rainwater will flow into the road with the most serious waterlogging.

Mode 4:FIG.11shows the intersection is in the multiple inlets and one outlet state; when it rains, rainwater flows into the intersection from multiple inlets and flows out from one outlet; the elevation reconstruction will generally be given up for this type of intersection, and trace upstream along inlet roads respectively to the previous intersection for judgement and reconstruction. In extreme cases, the elevation design of one or more intersecting roads will be changed so that the inflow and outflow of intersections become more than one drainage section, which will be treated according to the above methods from mode 1 to mode 3.

Embodiment 2

A road construction method based on the purpose of balanced road network drainage is provided. When a road intersecting with a road with a water accumulation section is built, the geomorphic form of the intersection and its limited adjacent areas are changed through elevation design so that the water flow is controlled to not flow or flow less to the road with water accumulation section.

On the basis of the above scheme, the roads with water accumulation section are the existing roads with waterlogged sections and water accumulation sections, the roads with V-shaped longitudinal road surface alignment at the existing non-intersection, or the unconstructed roads with V-shaped longitudinal road surface alignment at the existing non-intersection in the design. On the basis of the above scheme, for the existing roads with waterlogged sections and water accumulation sections and the roads with V-shaped longitudinal road surface alignment at the existing non-intersection, when constructing the intersecting roads, the newly built roads will not drain towards the existing roads and/or the water flowing into the waterlogged sections will flow to the newly-built roads through elevation reconstruction at the intersection.

On the basis of the above scheme, for the unconstructed roads but with V-shaped longitudinal road surface alignment at the non-intersection in the design, when newly designing, building the intersecting roads, the newly designed and built road will not drain towards the unconstructed roads with V-shaped longitudinal road surface alignment at the non-intersection in the design and/or the water flowing into the V-shaped low point will flow to the newly designed and built intersecting roads through elevation reconstruction.

The present invention has been described by way of example above, but the present invention is not limited to the above specific embodiments, and any modification or variation based on the present invention all belong to the scope of the present invention.