CN211420758U - Road drainage structure that drainage performance is high - Google Patents

Abstract

The utility model discloses a road drainage structure that drainage performance is high, including the soil layer, the upper end of soil layer is equipped with the road surface, the upper end both sides on road surface all are equipped with and block the hosepipe, the upper end both sides on soil layer all are equipped with the side ditch, and the equidistant blind ditch that transversely is provided with more than two in the soil layer that is located the road surface lower extreme, run through in the blind ditch and be equipped with the messy silk blind pipe. The utility model discloses a be connected between side ditch and the escape canal, be connected between road surface drainage and the escape canal, be connected between escape canal and the catch ditch, be connected between escape canal and the blind ditch, thereby make whole road drainage system form an all-round three-dimensional, promote each other, the complete drainage system of mutual coordination, the drainage performance has been improved greatly, it is inhomogeneous still to solve the subgrade settlement betterly, technical difficulties such as bridge head skip, its rationally distributed, it is few to occupy the farmland, be favorable to environmental protection simultaneously, in addition can the soil of wasting discharge utilization, the cost is reduced, therefore, the clothes hanger is strong in practicability.

Description

Road drainage structure that drainage performance is high

Technical Field

The utility model relates to a road drainage construction technical field in rainy season of African especially relates to a road drainage structure that drainage performance is high.

Background

The odjo-Hawassa highway project is located in south-south Baba east of Sea, is one section of a Baba-Kenya port Monba highway project of Seba-Kenya of capital Asia of the great Africa channel in planning, the overall route runs from east north to west south, and is arranged basically parallel to No. 6 highway of the Sega country, the starting point of the route is located at the northeast corner of Modjo and is connected with the Baba-Adama highway of Seya, a Modjo interchange is arranged, the ending point is located at the east side of Hawassa city, the project passes through a plurality of important towns such as Modjo, Koka, Iweii, Meki, Shashemene and Hawassa along the line, and the project is designed into 201.68 Km. The whole line owner is divided into four contract sections, the unit establishes a fourth contract section, the initial value-value stake number of the contract is MRK150+ 000-MRK 201+680, and the length of a line for construction of the unit is 51.68 Km.

The annual rainfall of the area where the project is located is 1000ml, the rainy seasons are concentrated in three seasons of 7 months, 8 months and 9 months, the rainfall is concentrated, and if the project drainage measures are not well processed, adverse effects can be caused on the roadbed stability of the expressway.

The stable roadbed is known to have very important significance for ensuring the service performance and the service life of the highway, water is a main natural factor harming the highway, roadbed subsidence, scouring, collapse and the like are related to the erosion of surface water and underground water in different degrees, so that the success or failure of the highway roadbed drainage design directly relates to the quality of engineering, the service life of the highway plays a decisive role in the success or failure of the engineering, and the high attention is paid to the road drainage in the whole stage of the road design construction operation. And in some areas of africa, there is a difference between the problem of concentrated drainage in rainy seasons and general drainage to avoid damage to the rain roads.

For the drainage design of roads, relevant data such as existing engineering geology, hydrogeology and the like are collected before the design, and if necessary, a special hydrogeology test is carried out to evaluate the influence of underground water on the roads, so that a reliable basis is provided for the underground drainage design. During design, conditions such as terrain, geology, hydrology, meteorology and the like along the line and the arrangement condition of bridges and culverts are comprehensively considered according to the grade of the highway, and various drainage facilities are mutually connected and matched to enable water to be quickly drained out of the range of the roadbed. The drainage design should combine prevention, drainage and drainage to ensure the road bed is in dry and medium wet state. Because different regions have special climatic and geological conditions, roadbed drainage facilities are usually inseparable from road surface drainage, roadbed protection and foundation treatment projects, and surface drainage and underground drainage are inseparable, and the system design and comprehensive consideration are required. Particularly in the areas with strong sudden rainstorm, strong rainstorm strength and large destructiveness in small watershed, the drainage of the areas must be paid enough attention in the drainage design and construction of the highway, and each drainage facility is convenient for construction, inspection and maintenance, thereby creating necessary conditions for maintenance.

The roadbed drainage hydrological calculation can be carried out according to a calculation method in national highway drainage design Specification (JTJ 018) or by referring to a calculation method in a highway design manual roadbed, corresponding drainage calculation is carried out by integrating hydrological data of local areas, and the drainage Specification specifies that the design recurrence period adopted by roadbed drainage design is 15 years for expressways and first-level highways and 10 years for other levels of highways. The section size of various surface drainage facilities should meet the requirement of designing drainage flow, and the ditch top should be higher than the design water surface in the ditch by more than 0.2 m. When hydrologic calculation is carried out on a roadbed drainage structure, a hydrologic calculation formula is selected according to factors such as the position, the action and the water collection range of the drainage structure, however, according to years of overseas construction, some general drainage concepts are not suitable for road construction drainage in African rainy seasons, and therefore a road drainage structure with high drainage performance is provided to solve the problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a road drainage structure with high drainage performance.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the road drainage structure with high drainage performance comprises a soil layer, wherein a road surface is arranged at the upper end of the soil layer, water blocking belts are arranged on two sides of the upper end of the road surface, side ditches are arranged on two sides of the upper end of the soil layer, more than two blind ditches are transversely arranged in the soil layer at the lower end of the road surface at equal intervals, a messy blind pipe penetrates through the blind ditches, volcanic cinders are filled in the messy blind pipes, PVC drainage pipes penetrate through two ends of each blind ditch, one end of each PVC drainage pipe penetrates through the side wall of each side ditch and extends into the corresponding side ditch, an abandoned soil blocking dam is stacked on one side of each side ditch, a side slope is arranged on one side of each abandoned soil blocking dam, a water blocking channel is arranged between each side slope and the abandoned soil blocking dam, a drainage channel penetrates through the side slopes and the abandoned soil blocking dams, and the drainage channels and the side ditches are communicated with the side.

Preferably, the messy blind pipe is made of a plastic material.

Preferably, the drainage ditch is a trapezoidal ditch, and the depth of the ditch is more than 80 cm.

Preferably, the side ditch is an inverted trapezoidal ditch.

The utility model discloses a be connected between side ditch and the escape canal, be connected between road surface drainage and the escape canal, be connected between escape canal and the catch ditch, be connected between escape canal and the blind ditch, thereby make whole road drainage system form an all-round three-dimensional, promote each other, the complete drainage system of mutual coordination, the drainage performance has been improved greatly, it is inhomogeneous still to solve the subgrade settlement betterly, technical difficulties such as bridge head skip, its rationally distributed, it is few to occupy the farmland, be favorable to environmental protection simultaneously, in addition can the soil of wasting discharge utilization, the cost is reduced, therefore, the clothes hanger is strong in practicability.

Drawings

FIG. 1 is a schematic view of a road section without drainage ditches;

FIG. 2 is a schematic view of a road section provided with drainage ditches;

FIG. 3 is a cross-sectional view of a section of road without a drain;

FIG. 4 is a schematic view of a blind trench arrangement;

FIG. 5 is a schematic view of filling a floss blind pipe and volcanic cinders;

FIG. 6 is an enlarged view of the structure at A;

fig. 7 is an enlarged view of the structure at B.

In the figure: 1 spoil retaining dam, 2 catchment canals, 3 slopes, 4 side ditches, 5 catchment belts, 6 road surfaces, 7 soil layers, 8 PVC drainage pipes, 9 drainage ditches, 10 blind ditches, 11 messy blind pipes and 12 volcanic cinders.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1 to 7, a road drainage structure with high drainage performance comprises a soil layer 7, a road surface 6 is arranged at the upper end of the soil layer 7, water blocking belts 5 are arranged on both sides of the upper end of the road surface 6, side ditches 4 are arranged on both sides of the upper end of the soil layer 7, more than two blind ditches 10 are transversely arranged in the soil layer 7 at the lower end of the road surface 6 at equal intervals, a floss blind pipe 11 penetrates through the blind ditches 10, volcanic cinders 12 are filled in the floss blind pipes 11, PVC drain pipes 8 penetrate through both ends of the blind ditches 10, one ends of the PVC drain pipes 8 penetrate through the side walls of the side ditches 4 and extend into the side ditches 4, a waste soil retaining dam 1 is stacked on one side of the side ditches 4, a side slope 3 is arranged on one side of the waste soil retaining dam 1, a water blocking channel 2 is arranged between the side slope 3 and the waste soil retaining dam 1, a drainage ditch 9 penetrates through the side slope 3 and the waste, the drainage ditch 9 is communicated with the intercepting canal 2 and the side ditch 4. The messy blind pipe 11 is made of plastic materials. The drainage ditch 9 is a trapezoidal ditch, and the depth of the ditch is more than 80 cm. The side ditch 4 is an inverted trapezoidal ditch. The method is characterized in that road drainage design is carried out by combining geographic conditions and project characteristics of an area where a project is located and simultaneously taking the reference of existing technical specifications of ERAROADDesign road, AASHTOstandard and the like of the EscherBiandyoda, according to the position and functions of a structure, drainage of the EscherGagh grade highway can be divided into two parts, namely surface drainage and underground drainage, wherein the surface drainage mainly discharges surface runoff, surface accumulated water, side slope rainwater and surface water which influences stability of a roadbed in a roadbed range, the underground drainage mainly discharges underground water flowing to the roadbed or reduces underground water level, comprehensive consideration is carried out according to highway grades, conditions such as terrain, geology, hydrology, meteorology and the like along the line and bridge arrangement conditions, and various drainage facilities are mutually connected and matched to promote water to be quickly discharged out of the roadbed range.

The problems of concentrated rainfall and road drainage in African regions are solved by adopting various drainage structures and comprehensively matching the drainage structures.

Surface drainage

The surface drainage can be divided into roadbed drainage and pavement drainage, and the main drainage facilities comprise side ditches, intercepting ditches, drainage ditches, water blocking belts and the like.

1. Side ditch

The side ditches are divided into cutting side ditches and embankment side ditches, are positioned on the outer sides of soil shoulders or slope protection ways and are used for collecting and removing water of road surfaces, road shoulders and side slopes, the section form of the side ditches is selected according to the terrain and geological conditions, the height of the side slopes, the catchment area and the drainage function, the influence of the side ditches on the driving safety and the environmental landscape is also noticed, trapezoidal, rectangular, U-shaped (or rectangular with cover plates and U-shaped), triangular and disc-shaped cross sections, buried side ditches and the like are selected according to local conditions, the excavation road sections are preferably selected according to triangular, shallow disc-shaped, cover plate rectangular and buried side ditches, and the sizes of all the parts are determined according to terrain, landform, catchment area, storm intensity, roadbed filling and excavation conditions and the like through hydrological and hydraulic calculation and by combining local experience. In the drainage design of the Essei high-grade highway, in order to increase the road appearance beauty and the driving safety, most of the sections of the AA highway adopt a triangular shape, part of the excavation sections adopt rectangular cover plate side ditches, the side surfaces of the triangular side ditches are more moderate than those of the rectangular ditches, the driving safety is increased, the quantity of safety facilities can be effectively reduced, the road appearance landscape is improved, but the defects are also overcome, because the sections of the triangular side ditches are smaller than the rectangular ditches, the defects of concentrated heavy rain in rainy seasons and insufficient water drainage capability are undoubtedly exposed, in addition, the terrain of the part of the sections is flatter, the excavation height of a roadbed is smaller, the arrangement length of the part of the section of the side ditches exceeds the standard requirement, the serious influence is caused on roadbed drainage in the project construction process, the part of the sections are damaged, therefore, in the drainage design process of the circular line outside the AA high-speed second period, the side ditch form of the inverted trapezoid side ditch is adopted for the first time, so that the section size of the side ditch is increased, the drainage capacity is improved, and the driving safety and the road capacity are not influenced.

2. Catch water drain

The roadbed is divided into a embankment intercepting ditch, a cutting top intercepting ditch and a platform intercepting ditch according to the roadbed filling and digging condition and the position, and one or more intercepting ditches can be arranged according to specific conditions.

The intercepting ditch is arranged for protecting the side slope from being washed by ground water from the side slope or the top of the hillside, the cross section size of the intercepting ditch needs to be determined through flow calculation, in order to prevent the side slope from being damaged, the position and the number of the intercepting ditch are very important, the position of the intercepting ditch is determined after investigation of detailed hydrology, geology, terrain and the like, effective seepage-proofing measures are adopted for the intercepting ditch, the water outlet is required to extend out of the range of the roadbed, energy dissipation facilities are arranged at the outlet to ensure the stability of the side slope and the roadbed, two section forms, namely a rectangular intercepting ditch and a trapezoidal intercepting ditch are adopted for the intercepting ditch in the design of the AA highway, and the trapezoidal intercepting ditch is adopted to intercept a large amount of off-line water in a short time from the drainage effect in the later period to adapt to the off-line intercepting requirement of the roadbed in a short-time high-strength large range. Because the two sides of the roadbed of part of the region are provided with the black cotton soil and the silt, the water permeability of the soil is strong, but the resistance to scouring is weak, so that the scouring of precipitation or off-line water is easily caused, the fragile soil bodies on the two sides of the intercepting ditches are easily scoured into the intercepting ditches, and the clogging and drainage of the intercepting ditches are not smooth, therefore, in the region with serious clogging of the intercepting ditches, the abandoned soil with a certain height is piled between the side slope of the roadbed and the intercepting ditches, so that a dam along the route is constructed between the off-line water and the roadbed, the water intercepting capability of the intercepting ditches is increased, even if the intercepting ditches are clogged, the adjacent intercepting dams can also provide a corresponding larger amount of water intercepting capability, the abandoned soil is changed into valuable, the resistance to the off-line water of the roadbed is increased under the condition of not increasing the cost, the setting length and the engineering quantity of the intercepting ditches are indirectly reduced, in the field where the abandoned soil retaining dam with a tenser land is not capable of being effectively implemented, the method of deepening the intercepting ditches and heightening the intercepting walls is adopted to obtain good effects.

3. Drainage ditch

When water collected at a side ditch, a catch basin, a soil yard and a low-lying part near the roadbed is guided to the outside of the roadbed, a drainage ditch is arranged, the section form of the drainage ditch is determined by combining terrain and geological conditions, the longitudinal slope of the bottom of the ditch is not less than 0.3 percent, the connection with other drainage facilities is smooth, the drainage ditch easy to be scoured by water flow adopts protection and reinforcement measures according to actual conditions, the arrangement of the drainage ditch can consider two forms of soil property and masonry reinforcement, the section with a small longitudinal slope of the drainage ditch can adopt a soil drainage ditch when the terrain is flat, when the longitudinal slope is more than 1 percent or the section with serious local scour needs to adopt paved and paved rubble stones to reinforce the bottom and the side surface of the drainage ditch, in an Egypt region, the drainage ditch generally adopts a trapezoidal ditch with the depth of more than 80cm, and when the section with the length of the drainage ditch of more than 500m needs to consider to increase the section size of the drainage ditch appropriately, the drainage ditch arranged on the black cotton soil section should enable the slope of the ditch wall to be reduced as much as possible, and the inner wall can be reinforced if necessary so as to avoid the collapse of the ditch wall caused by the long-term soaking of rainwater. In AA high speed and outer loop drainage ditch designs, slope rates typically use a 1: 1, increasing the special section to 1: 1.5-1: 2.

4. water blocking belt

The method comprises the following steps of selecting a concrete form according to rainfall characteristics and drainage design of project areas, wherein the concentrated drainage is generally realized by arranging a rectangular ditch or a water-blocking and water-blocking belt on a road shoulder, the dispersed drainage is generally realized by hardening the road shoulder or greening vegetation protection, wherein the water-blocking and water-blocking belt is an important facility for the drainage of the road surface, the water-blocking and water-blocking belt is widely applied to the drainage design of the Escheimh high-grade highway, the water-blocking and water-blocking belt is arranged on a filling road section, a good road surface drainage effect is achieved, and particularly, the water-blocking belt can effectively protect the road shoulder and soil slopes on two sides from centralized rainwater washing when greening of the road shoulder is not formed and effective vegetation protection layers are not formed on slope soil on the sides at the initial construction stage, so that a good protection effect is achieved on the road foundation.

Second, underground drainage

Underground drainage is in three types, namely blind ditches, seepage ditches (blind ditches) and seepage wells. The blind ditch is widely applied to roadbed underground drainage of AA high-speed and outer loop lines, and achieves a good drainage effect. The blind ditches used by AA high speed and outer loop lines are mainly of two types: rubble french drains and PVC pipe rubble french drains. Most of the paragraphs use the lithotripsy. The blind ditch is generally made of specially screened non-graded broken stone filler, can be replaced by volcanic cinders with the same particle size and good water permeability, is wrapped by permeable geotextile, and achieves the effect of drainage by utilizing gaps among the broken stones, thereby forming a complete underground drainage system. The blind ditch is arranged by paying attention to the following points: the blind ditches are generally arranged in areas with low filling shallow excavation and difficult terrain flat drainage, the AA high speed and the outer ring line adopt the standard of filling less than 3 meters, and theoretically, the blind ditches are arranged in excavation sections, but if the bottom of an excavation roadbed is a complete rock surface without broken and obvious cracks, the blind ditches are not arranged; the length of each blind ditch is not more than 500m, the longitudinal slope of the blind ditch is not less than 0.3%, a transverse blind ditch is added on a road section with a water outlet to discharge water in the blind ditch out of a roadbed in time, and a PVC pipe is arranged at a blind ditch discharge outlet to accelerate the discharge of water flow in the blind ditch

Third, integrity of roadbed drainage system

In road drainage design process, the interrelationship and the interconnect between the wholeness of road drainage design and the various drainage facilities are very important, the utility model discloses be connected between well side ditch and the escape canal, be connected between road surface drainage and the escape canal, be connected between escape canal and the catch ditch, be connected between escape canal and the blind ditch to make whole road drainage system form an all-round three-dimensional, promote each other, the complete drainage system of mutual coordination, in addition the utility model discloses to solve the road bed better and subside technical difficulty such as inhomogeneous, the bridgehead jumps the car.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims (4)

1. The utility model provides a road drainage structures that drainage performance is high, includes soil layer (7), its characterized in that: the road surface (6) is arranged at the upper end of the soil layer (7), the water blocking belts (5) are arranged on two sides of the upper end of the road surface (6), the side ditches (4) are arranged on two sides of the upper end of the soil layer (7), more than two blind ditches (10) are transversely arranged in the soil layer (7) at the lower end of the road surface (6) at equal intervals, the messy blind pipes (11) penetrate through the blind ditches (10), volcanic cinders (12) are filled in the messy blind pipes (11), PVC drain pipes (8) penetrate through two ends of the blind ditches (10), one ends of the PVC drain pipes (8) penetrate through the side wall of the side ditches (4) and extend into the side ditches (4), the abandoned soil water blocking dam (1) is stacked on one side of the side ditches (4), the side slope (3) is arranged on one side of the abandoned soil blocking dam (1), and the water blocking ditch (2) is arranged between the side slope (3) and the abandoned soil blocking, run through between side slope (3) and the spoil retaining dam (1) and be equipped with escape canal (9), escape canal (9) and catch canal (2) and side ditch (4) link up the setting.

2. A road drainage structure with high drainage performance as claimed in claim 1, wherein: the messy blind pipe (11) is made of plastic materials.

3. A road drainage structure with high drainage performance as claimed in claim 1, wherein: the drainage ditch (9) adopts a trapezoidal ditch, and the depth of the ditch is more than 80 cm.

4. A road drainage structure with high drainage performance as claimed in claim 1, wherein: the side ditch (4) adopts an inverted trapezoidal ditch.

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