CN111827152A - Internal drainage structure of edge-covered roadbed and implementation method thereof - Google Patents
Internal drainage structure of edge-covered roadbed and implementation method thereof Download PDFInfo
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- CN111827152A CN111827152A CN202010672158.9A CN202010672158A CN111827152A CN 111827152 A CN111827152 A CN 111827152A CN 202010672158 A CN202010672158 A CN 202010672158A CN 111827152 A CN111827152 A CN 111827152A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
- E03F3/046—Open sewage channels
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Abstract
The invention provides an internal drainage structure of a bordure roadbed, which comprises a foundation and a roadbed filling layer positioned above the foundation, wherein longitudinal and longitudinal water collecting blind ditches and transverse water collecting blind ditches are arranged above the foundation in a crosswise way, the longitudinal and transverse water collecting blind ditches are positioned below the roadbed filling layer, and the longitudinal and transverse water collecting blind ditches and the transverse water collecting blind ditches which are arranged in a crosswise way are communicated with each other at an intersection point, the longitudinal and transverse water collecting blind ditches which are arranged in a crosswise way are arranged under the filling layer to collect water ', the transverse drainage pipe is arranged under the bordure layer to guide water', drainage ditches are arranged at two sides of the roadbed to form a drainage system which is organically combined with 'collecting' - 'guiding' - 'draining', compared with the scheme that a drainage layer is arranged at the bottom part of the bordure layer of the roadbed, the internal drainage efficiency of the roadbed can be improved by more than 15 percent by the structure and the method, especially for an ultra-wide roadbed, the accumulated water in the roadbed can be discharged in time, and the softening and uneven deformation of the local accumulated water are avoided.
Description
Technical Field
The invention belongs to the technical field of highway engineering, and particularly relates to an internal drainage structure of a covered-edge roadbed and an implementation method thereof, which are suitable for internal drainage of a covered-edge embankment such as a sand-filled roadbed, a silt roadbed, a soft rock embankment, a tailing sand roadbed and the like in highway engineering.
Background
The edge-covered structure is a typical structure form of a special filler roadbed such as sand filling, silt, soft rock, tailing sand, expansive soil and the like in highway engineering, the edge-covered roadbed fills a common cohesive soil edge-covered layer with the thickness of 1-3m on the surface layers of side slopes on two sides of the roadbed, and a core-filling layer of a special filler embankment is wrapped inside the roadbed so as to reduce the influence and damage of an external warm and humid environment on the special filler roadbed. However, because the water permeability of the cohesive soil of the edge-covering layer is very weak, the water inside the roadbed is also blocked by the edge-covering layer, water is easily accumulated inside the roadbed in a rainy region or a region with a high underground water level, the water accumulated inside the roadbed can cause the humidification deformation, settlement and even instability damage of the roadbed, and therefore the edge-covering roadbed needs to be specially designed with a reliable roadbed internal drainage structure.
Regarding the internal drainage of the edge-covered roadbed, two technical schemes are mainly adopted in the current engineering practice. The first technical proposal is that a gravel drainage cushion layer is arranged at the bottom of the edge-covered roadbed, for example, in a roadbed structure which is proposed by patent 201720765926.9 and used for filling high liquid limit soil, a 40cm gravel cushion layer is filled at the full section of the roadbed bottom of the edge-covered roadbed structure of the high liquid limit soil roadbed; according to the lake region high-fill roadbed sand-blowing embankment structure provided by the patent 201520798493.8, a 50cm sand cushion layer is filled on the full section of the bottom of the edge-covered embankment; this kind of scheme that sets up the sand cushion layer bottom the road bed can effectively discharge the moisture in the road bed filling layer, actually the inside moisture of road bed is usually less, and the drainage ability that full section set up the sand cushion layer far exceeds the inside displacement demand of road bed, is a comparatively extravagant scheme to sand gravel or crushed stone lack the area, and engineering economy remains to be optimized. The second technical proposal is that a drainage channel is only arranged at the bottom part of a roadbed edge-covered layer, for example, in the ecological protection method of a sand-filled roadbed hollow block proposed by patent 200710052857.8, transverse pebble blind ditches are arranged at intervals along the left side and the right side of the route direction for draining accumulated water in the roadbed; in a roadbed internal drainage system for building garbage regeneration material filling proposed by patent 201621491819.3, vertical drainage channels and a lower horizontal drainage layer are arranged on two sides of a roadbed, water in the roadbed is collected to the vertical drainage channels through a cross slope, and water in the vertical drainage channels and the edge drainage layer is collected to the lower horizontal drainage layer and is discharged out of the roadbed structure through horizontal drainage pipes; this kind of scheme at the local drainage blanket that sets up in road bed bordure bottom, first scheme relatively, the work load of reduction drainage blanket that can be fine, nevertheless to the super wide cross section road bed of multilane highway, especially when the water permeability of filling out the sandwich layer is relatively weak, the inside moisture of road bed still is difficult to in time to pass through the cross slope and arranges the drainage blanket to the road bed limit portion, produces local ponding softening and inhomogeneous deformation easily.
Disclosure of Invention
In view of the above problems in the prior art, it is an object of the present invention to provide an internal drainage structure of a covered roadbed, which realizes internal drainage of the roadbed by constructing a drainage system organically combining 'water collection' - 'water guide' - 'drainage', and has the advantages of high drainage performance, economy, practicality, and wide applicability, and can be used for internal drainage of covered embankments of low-grade highways and internal drainage of covered embankments of ultra-wide roadbeds of high-grade highways.
The second purpose of the invention is to provide an implementation method of the internal drainage structure of the edge-covered roadbed, which has the main advantages that the drainage capacity of the drainage structure is optimized to the maximum extent according to the internal drainage requirement of the edge-covered roadbed, the drainage efficiency is improved, the engineering redundancy is reduced, and meanwhile, practical construction materials and processes in engineering practice are optimized and integrated, so that the implementation method of the invention is convenient, economic and reasonable in construction.
The technical scheme of the invention is realized as follows:
the utility model provides an inside drainage structures of bordure road bed, includes the ground and is located the road bed of ground top and fills the sandwich layer, the top layer of ground has violently indulges the vertical blind ditch that catchments and horizontal catchment blind ditch of cross arrangement, vertical catchment blind ditch is located the road bed and fills the foundation top layer of core layer below, and the mutual intercommunication is located in nodical department to vertical catchment blind ditch and horizontal catchment blind ditch of intercrossing setting, the road bed is filled the sandwich layer outside and is equipped with the bordure layer, be equipped with the road bed escape canal on the ground of bordure layer both sides, the road bed escape canal with a plurality of transverse drain pipes of interval arrangements such as being equipped with in the foundation top layer between the vertical catchment blind ditch, transverse drain pipe communicates the road bed escape canal with vertical catch.
Preferably, the number of the longitudinal water collecting blind ditches is 2-5, the distance between two adjacent longitudinal water collecting blind ditches is 10-30m, and one longitudinal water collecting blind ditch is respectively arranged at the positions below slope feet at two sides of the roadbed core filling layer.
Preferably, the distance between two adjacent transverse water collecting blind ditches is 5-20m, the distance between two adjacent transverse water discharging pipes is 5-20m, and 2-4% of outward-inclined transverse slopes are formed at the ditch bottom positions of the transverse water collecting blind ditches.
Preferably, the cross sections of the longitudinal water collecting blind ditches and the transverse water collecting blind ditches are both rectangular structures with the width of 40-80cm and the depth of 20-40cm, and each structure comprises an impermeable geomembrane, a water filtering geotextile and a water collecting layer, the impermeable geomembranes are laid at the bottom and two side walls of the water collecting blind ditches, the water collecting layers are filled in cavities of the water collecting blind ditches, and the water filtering geotextiles are laid at the top surfaces of the blind ditches.
Preferably, the impermeable geomembrane is a polyethylene film with the thickness of not less than 0.5 mm.
Preferably, the water-filtering geotextile is a II-grade non-woven geotextile with the unit mass of more than 300 g/square meter.
Preferably, the water collecting layer is gravel or coarse sand, and the content of fine particles with the particle size of less than 2.36mm is less than 5%.
Preferably, the open column structure that road bed escape canal distributes for following road bed bordure layer toe 1-2m outward, and the cross section is trapezoidal, and the degree of depth is 60-100cm, the road bed escape canal is built by laying bricks or stones concrete by the thick liquid and is formed, and at the bottom of the ditch and both sides wall thickness be 10-30cm, the lateral wall that the road bed escape canal was passed to transverse drainage pipe, just transverse drainage pipe's exit position is more than 30cm in road bed escape canal bottom surface, transverse drainage pipe's tube seat bottom surface forms 2-4% outer inclination transverse slope.
Preferably, the transverse drain pipe extends to the inner position of the longitudinal water collecting blind ditch, the length of the transverse drain pipe extending into the longitudinal water collecting blind ditch is 5-15cm, the end part of the transverse drain pipe is wrapped by a permeable geotextile, the permeable geotextile is an I-grade nonwoven geotextile with the permeability coefficient of more than 5.0 multiplied by 10-2cm/s, the transverse drain pipe is a PVC drain pipe, and the pipe diameter of the transverse drain pipe is 10-20 cm.
An implementation method of an internal drainage structure of a covered roadbed comprises the following steps:
step one, according to the construction conditions of highway engineering and the project scheme of edge-covering of the roadbed, arranging an internal drainage structure of the edge-covering roadbed in the foundation, wherein the internal drainage structure comprises a water collection network consisting of a longitudinal water collection blind ditch and a transverse water collection blind ditch under a roadbed filling layer, a transverse drainage pipe under the edge-covering layer and drainage ditches on two sides of the roadbed to form an arrangement diagram of the internal drainage structure of the edge-covering roadbed.
And secondly, leveling the ground, compacting the foundation, lofting according to a layout of the drainage structure inside the covered roadbed, excavating grooves of a longitudinal water collection blind ditch, a transverse drainage pipe and a roadbed drainage ditch on the surface layer of the foundation in the sequence of longitudinal direction, transverse direction, middle direction and two sides, wherein 2-4% of outward-inclined transverse slopes are formed at the bottoms of the grooves.
And thirdly, paving anti-seepage geomembranes at the bottom and the wall of the water collecting blind ditch one by one according to the sequence of longitudinal direction and transverse direction, filling crushed stones or coarse gravel into the ditch, and paving water filtering geotextile on the top surfaces of the crushed stones or the coarse gravel to form a water collecting net formed by the longitudinal and transverse water collecting blind ditches.
And fourthly, in the trench of the roadbed drainage ditch, according to the process that the ditch bottom is firstly built and then the ditch wall is built from bottom to top, masonry rubble or rubble concrete is adopted to build the drainage ditch, and an orifice connected with the outlet end of the transverse drainage pipe is reserved.
And step five, binding the permeable geotextile at the inlet end of the transverse drainage pipe, and placing the transverse drainage pipes bound with the permeable geotextile in corresponding grooves one by one to ensure that the transverse drainage pipes are connected with the longitudinal water collecting blind ditches and the roadbed drainage ditches to form the roadbed internal drainage structure.
And step six, filling the roadbed covered by the internal drainage structure layer by layer to a designed elevation, allowing water in a filling layer in the roadbed to seep to the surface of the roadbed under the action of gravity, flowing into a longitudinal and transverse water collecting blind ditch water collecting net along a base transverse slope, guiding the water through a transverse drainage pipe, discharging accumulated water of the water collecting blind ditch to roadbed drainage ditches at two sides of the roadbed, and finally guiding the water through the roadbed drainage ditches to discharge the water out of a highway drainage system.
By adopting the technical scheme, the invention has the beneficial effects that:
(1) in the aspect of drainage performance, the crisscross longitudinal and transverse water collecting blind ditches are arranged on the surface layer of the foundation under the core filling area to collect water, ' the transverse drainage pipes are arranged on the surface layer of the foundation under the edge covering layer to guide water, ' drainage ditches are arranged on the surface layer of the foundation on two sides of the roadbed to drain water ', and a drainage system organically combined with ' collecting ' - ' guiding ' - ' draining ' is formed.
(2) In the aspect of engineering economy, compared with a drainage scheme that a sand cushion layer is fully paved at the bottom of a roadbed, according to the requirement of drainage inside a covered roadbed, the invention arranges a crisscross longitudinal and transverse water-collecting blind ditch net on the surface layer of the foundation under a core filling area, so that the drainage capacity of the water-collecting blind ditch is matched with the water accumulation inside the roadbed, the square amount of broken stones or coarse gravel can be reduced by more than 60 percent, and meanwhile, a PVC pipe is adopted under the covered layer to replace the drainage blind ditch, thereby reducing the construction cost.
(3) In the aspect of application range, because the water collecting blind drain nets arranged under the filling core area can adjust the intervals of the blind drain nets according to the width of the roadbed and the water permeability of filling core layer fillers, compared with the prior technical scheme, the scheme that the drainage layer is arranged at the part of the bottom of the roadbed bounding layer is only suitable for the road section with large permeability of the filling core layer and smaller width of the roadbed, the invention has wider application range, is suitable for sand filling roadbeds and slag roadbeds with good water permeability, is also suitable for silt roadbeds with poor water permeability and high-liquid soil-limit roadbeds, and is simultaneously suitable for internal drainage of the edge-covered embankment of the low-grade highway and also suitable for internal drainage of the edge-covered embankment of the multi-lane ultra-wide roadbeds of the high-grade.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a cross-sectional layout view of an internal drainage structure of a covered roadbed according to the present invention
FIG. 2 is a plan view of the drainage structure inside the covered roadbed according to the present invention
Fig. 3 is a sectional view of a connecting part of a longitudinal water collecting blind ditch and a transverse drainage pipe in the drainage structure inside the edge-covered roadbed.
Wherein:
1. a longitudinal water collecting blind ditch; 2. a horizontal water collecting blind ditch; 3. a transverse drain pipe; 4. a roadbed drainage ditch; 5. filling a core layer in the roadbed; 6. a binding layer; 7. a foundation; 8. a pavement; 9. a water collection layer; 10. an impermeable geomembrane; 11. draining the geotextile; 12. a water permeable geotextile.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the internal drainage structure of the covered roadbed comprises a longitudinal water collecting blind ditch 1, a transverse water collecting blind ditch 2, a transverse drainage pipe 3, a roadbed drainage ditch 4 and a pavement structure 8. 2-5 longitudinal water collecting blind ditches 1 which are distributed at equal intervals are longitudinally distributed on the surface layer of a foundation 7 under a roadbed filling core layer 5, a transverse water collecting blind ditch 2 is distributed at intervals of 5-20m, and the longitudinal water collecting blind ditches 1 and the transverse water collecting blind ditches 2 form a water collecting net which is in cross communication; and arranging transverse drain pipes 3 at intervals of 5-20m in the longitudinal direction on the surface layer of a foundation 7 under the roadbed edge covering layer 6, arranging roadbed drainage ditches 4 in the foundation 7 outside slope feet on two sides of the roadbed, wherein one ends of the transverse drain pipes 3 extend into the longitudinal water collecting blind ditches 1 to be communicated with the longitudinal water collecting blind ditches, and one ends of the transverse drain pipes 3 extend out of the roadbed drainage ditches 4 to be communicated with the longitudinal water collecting blind ditches. The water in the filling layer 5 in the edge-covered roadbed seeps to the surface of the foundation 7 under the action of gravity, then flows into the longitudinal water collecting blind ditch 1 and the transverse water collecting blind ditch 2 through the transverse slope, and then flows through the transverse drain pipe 3 to be guided out of the roadbed drainage ditch 4 and discharged out of a highway drainage system.
Preferably, the longitudinal water collecting blind ditch 1 is a strip-shaped blind ditch which is longitudinally distributed along a roadbed, the cross section of the blind ditch is rectangular, the width of the cross section is 40-80cm, and the depth of the blind ditch is 20-40 cm. The longitudinal water collecting blind ditch 1 consists of an impermeable geomembrane 10, a water filtering geotextile 11 and a water collecting layer 9, wherein the water collecting layer is made of broken stones or coarse sand grains, the impermeable geomembrane 10 is laid at the bottom and two side walls of the blind ditch, the water collecting layer 9 is filled in a cavity of the water collecting blind ditch, and the water filtering geotextile 11 is laid at the top surface of the blind ditch. The longitudinal water collecting blind ditches 1 are distributed on the surface layer of a foundation 7 under a roadbed filling layer 5, wherein the lower parts of slope feet at two sides of the filling layer 5 are respectively distributed, and the longitudinal water collecting blind ditches 1 are additionally arranged at intervals of 10-30m along the transverse distance of the foundation.
Preferably, the transverse water collecting blind ditch 2 is a strip-shaped blind ditch which is transversely arranged along a roadbed, the cross section of the strip-shaped blind ditch is rectangular, the width of the cross section is 30-60 cm, and the depth of the strip-shaped blind ditch is 20-40 cm. The transverse water collecting blind ditch 2 consists of an impermeable geomembrane 10, a water filtering geotextile 11 and a water collecting layer 9, wherein the water collecting layer is made of gravels or coarse sand grains, the impermeable geomembrane 10 is laid at the bottom and two side walls of the blind ditch, the water collecting layer 9 is filled in a cavity of the water collecting blind ditch, and the water filtering geotextile 11 is laid at the top surface of the blind ditch. The transverse water collecting blind ditches 2 are arranged on the surface layer of a foundation 7 under the roadbed filling layer 5, are arranged at intervals of 5-20m along the longitudinal direction of the foundation and are in cross communication with the longitudinal water collecting blind ditches 1. And 2-4% of outward-inclined transverse slopes are formed at the bottoms of the transverse water collecting blind ditches 2.
Preferably, the transverse drain pipe 3 is a pvc drain pipe with one end wrapped with a permeable geotextile 12, and the pipe diameter is 10-20 cm. The horizontal drainage pipes 3 are arranged on the surface layer of a foundation 7 under the roadbed hemmed layer 6 and are arranged at intervals of 5-20m in the longitudinal direction, the inlet ends of the horizontal drainage pipes 3 extend into the longitudinal water collecting blind ditches 1 and are communicated with the longitudinal water collecting blind ditches by 5-15cm, the outlet ends of the horizontal drainage pipes extend into the roadbed drainage ditches 4 and are communicated with the longitudinal water collecting blind ditches, and the inlet ends of the horizontal drainage pipes 3, which are connected with the longitudinal water collecting blind ditches 1, are wrapped with the permeable geotextiles 12.
Preferably, the roadbed drainage ditch 4 is an open drainage ditch which is distributed along the outer side of 1-2m of a roadbed slope toe, the cross section of the open drainage ditch is trapezoidal, the depth of the open drainage ditch is 60-100cm, the drainage ditch is built by mortar-laid rubble or rubble concrete, and the thickness of the ditch bottom and two side walls is 10-30 cm. The roadbed drainage ditch 4 is connected with the transverse drainage pipe 3, the transverse drainage pipe 3 should penetrate through the side wall of the roadbed drainage ditch 4, and the outlet elevation of the transverse drainage pipe 3 should be higher than the bottom surface of the roadbed drainage ditch 4 by more than 30 cm. And 2-4% of outward-inclined transverse slope is formed on the bottom surface of the pipe groove of the transverse drain pipe 3.
Preferably, the impermeable geomembrane 10 is a polyethylene film with the thickness of not less than 0.5 mm.
Preferably, the water-filtering geotextile 11 is a II-grade non-woven geotextile with the unit mass of more than 300 g/square meter.
Preferably, the permeable geotextile 12 is a class I nonwoven geotextile having a permeability coefficient of greater than 5.0X 10-2 cm/s.
Preferably, the crushed stone or coarse gravel should have a fine content of less than 5% with a particle size of less than 2.36 mm.
An implementation method of an internal drainage structure of a covered roadbed comprises the following steps:
step one, according to the construction conditions of highway engineering and the project scheme of edge-covering of the roadbed, the internal drainage structure of the edge-covering roadbed is arranged in a foundation 7, and comprises a water collecting net consisting of a longitudinal water collecting blind ditch 1 and a transverse water collecting blind ditch 2 under a roadbed filling layer 5, a transverse drainage pipe 3 under an edge-covering layer 6 and drainage ditches at two sides of the roadbed, so that the layout of the internal drainage structure of the edge-covering roadbed is formed.
And step two, leveling the field, compacting the foundation 7, lofting according to the arrangement diagram of the drainage structure inside the covered roadbed, excavating grooves of a longitudinal water collecting blind ditch 1, a transverse water collecting blind ditch 2, a transverse drainage pipe 3 and a roadbed drainage ditch 4 on the surface layer of the foundation 7 in the sequence of longitudinal direction, transverse direction, middle direction and two sides, wherein 2-4% of outward-inclined transverse slopes are formed at the bottoms of the grooves.
And thirdly, paving anti-seepage geomembranes 10 at the bottom and the wall of the water collecting blind ditch one by one according to the sequence of longitudinal direction and transverse direction, filling crushed stones or coarse gravel into the ditch, and paving water filtering geotextile 11 on the top surfaces of the crushed stones or the coarse gravel to form a water collecting net formed by the longitudinal and transverse water collecting blind ditches 2.
And fourthly, in the groove of the roadbed drainage ditch 4, according to the process that the ditch bottom is firstly arranged and the ditch wall is arranged from bottom to top, masonry of the drainage ditch by mortar rubble or rubble concrete is adopted, and an opening connected with the outlet end of the transverse drainage pipe 3 is reserved.
And step five, binding the permeable geotextile 12 at the inlet end of the transverse drainage pipe 3, and placing the transverse drainage pipes 3 bound with the permeable geotextile 12 in corresponding grooves one by one to ensure that the transverse drainage pipes 3 are connected with the longitudinal water collecting blind ditch 1 and the roadbed drainage ditch 4 to form the roadbed internal drainage structure.
And step six, filling the roadbed covered by the internal drainage structure layer by layer to a designed elevation, allowing water in a filling layer 5 in the roadbed to seep to the surface of the foundation 7 under the action of gravity, flowing into the longitudinal and transverse water collecting blind ditches 2 water collecting net along the base cross slope, guiding the water through the transverse drainage pipes 3, discharging accumulated water of the water collecting blind ditches to roadbed drainage ditches 4 on two sides of the roadbed, and finally guiding the water through the roadbed drainage ditches 4 to discharge the water out of a highway drainage system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides an inside drainage structures of bordure road bed which characterized in that: comprises a foundation (7) and a roadbed filling layer (5) positioned above the foundation (7), the surface layer of the foundation (7) is provided with longitudinal water collecting blind ditches (1) and transverse water collecting blind ditches (2) which are arranged in a transverse and longitudinal crossed manner, the longitudinal water collecting blind ditches (1) are positioned on the surface layer of the foundation below the roadbed filling layer (5), the longitudinal water collecting blind ditches (1) and the transverse water collecting blind ditches (2) which are arranged in a mutually crossed way are mutually communicated at the intersection points, a bordure layer (6) is arranged outside the roadbed filling layer (5), roadbed drainage ditches (4) are arranged on foundations (7) on two sides of the bordure layer (6), a plurality of transverse drain pipes (3) which are arranged at equal intervals are arranged in the surface layer of the foundation between the roadbed drainage ditch (4) and the longitudinal water collecting blind ditch (1), the transverse drainage pipe (3) is used for communicating the roadbed drainage ditch (4) with the longitudinal water collection blind ditch (1);
wherein: the number of the longitudinal water collecting blind ditches (1) is 2-5, the distance between two adjacent longitudinal water collecting blind ditches (1) is 10-30m, and the longitudinal water collecting blind ditches (1) are respectively arranged at the positions under the slope feet at two sides of the roadbed filling layer (5); the cross sections of the longitudinal water collecting blind ditches (1) and the transverse water collecting blind ditches (2) are both rectangular structures with the width of 40-80cm and the depth of 20-40cm, and each structure comprises an impermeable geomembrane (10), a water filtering geotextile (11) and a water collecting layer (9).
2. The internal drainage structure of a bordure roadbed according to claim 1, characterized in that: the distance between every two adjacent transverse water collecting blind ditches (2) is 5-20m, the distance between every two adjacent transverse water discharging pipes (3) is 5-20m, and 2-4% of outward-inclined transverse slopes are formed at the ditch bottom positions of the transverse water collecting blind ditches (2).
3. The internal drainage structure of a bordure roadbed according to claim 1, characterized in that: the seepage-proof geomembrane (10) is paved at the bottom and two side walls of the water collecting blind ditch, the water collecting layer (9) is filled in a cavity of the water collecting blind ditch, and the water filtering geotextile (11) is paved at the top surface of the blind ditch.
4. The internal drainage structure of a bordure roadbed of claim 4, wherein: the impermeable geomembrane (10) is a polyethylene film with the thickness not less than 0.5 mm.
5. The internal drainage structure of a bordure roadbed of claim 4, wherein: the water-filtering geotextile (11) is a II-grade non-woven geotextile with unit mass of more than 300 g/square meter.
6. The internal drainage structure of a bordure roadbed of claim 4, wherein: the water collecting layer (9) is made of broken stones or coarse sand grains, and the content of fine grains with the grain size of less than 2.36mm is less than 5 percent.
7. The internal drainage structure of a bordure roadbed according to claim 1, characterized in that: roadbed drainage ditch (4) are trapezoidal for following the uncovered column structure that road bed bordure layer (6) toe 1-2m distributes outward, and the degree of depth is 60-100cm, roadbed drainage ditch (4) are built by laying bricks or stones concrete by the thick liquid and are formed, and at the bottom of the ditch and both sides wall thickness be 10-30cm, the lateral wall of roadbed drainage ditch (4) is passed in lateral drainage pipe (3), just the exit position of lateral drainage pipe (3) is more than 30cm in roadbed drainage ditch (4) bottom surface, the tube seat bottom surface of lateral drainage pipe (3) forms 2-4% camber transverse slope.
8. The internal drainage structure of a bordure roadbed according to claim 1, characterized in that: the horizontal drain pipe (3) extends to the inner position of the longitudinal water collecting blind ditch (1), the length of the horizontal drain pipe extending into the longitudinal water collecting blind ditch (1) is 5-15cm, the end part of the horizontal drain pipe is wrapped with a permeable geotextile (12), the permeable geotextile (12) is an I-grade nonwoven geotextile with the permeability coefficient of more than 5.0 multiplied by 10 < -2 > cm/s, the horizontal drain pipe (3) is a PVC drain pipe, and the pipe diameter is 10-20 cm.
9. A method of implementing a drainage structure inside a serging roadbed as claimed in any one of claims 1 to 9, comprising the steps of:
step one, according to highway engineering construction conditions and a roadbed edge-covering engineering scheme, arranging an edge-covering roadbed internal drainage structure in a foundation (7), wherein the edge-covering roadbed internal drainage structure comprises a water collection net consisting of a longitudinal water collection blind ditch (1) and a transverse water collection blind ditch (2) under a roadbed filling layer (5), a transverse drainage pipe (3) under an edge covering layer (6) and drainage ditches on two sides of the roadbed, and forms an edge-covering roadbed internal drainage structure layout diagram;
leveling the ground, compacting the foundation (7), lofting according to a drainage structure layout diagram inside the covered roadbed, excavating grooves of a longitudinal water collecting blind ditch (1), a transverse water collecting blind ditch (2), a transverse drainage pipe (3) and a roadbed drainage ditch (4) on the surface layer of the foundation (7) in the sequence of longitudinal direction, transverse direction, middle direction and two sides, wherein 2-4% of outward-inclined transverse slopes are formed at the bottoms of the grooves;
thirdly, paving anti-seepage geomembranes (10) at the bottom and the wall of the water collecting blind ditch one by one according to the sequence of longitudinal direction and transverse direction, then filling crushed stones or coarse gravel into the ditch, and paving water filtering geotextiles (11) on the top surfaces of the crushed stones or coarse gravel to form a water collecting net formed by the longitudinal and transverse water collecting blind ditches (2);
step four, in the groove of the roadbed drainage ditch (4), according to the process from bottom to top of the ditch after the ditch bottom, adopt and pulp rubble or rubble concrete to build the drainage ditch, and reserve the hole mouth connecting the outlet end of the horizontal drainage pipe (3);
binding the permeable geotextile (12) at the inlet end of the transverse drainage pipe (3), and placing the transverse drainage pipes (3) bound with the permeable geotextile (12) in corresponding grooves one by one to ensure that the transverse drainage pipes (3) are connected with the longitudinal water collecting blind ditch (1) and the roadbed drainage ditch (4) to form a roadbed internal drainage structure;
and step six, filling the roadbed covered by the internal drainage structure layer by layer to a designed elevation, allowing water in a filling layer in the roadbed to seep to the surface of the foundation (7) under the action of gravity, flowing into a longitudinal and transverse water collecting blind ditch (2) water collecting net along a base transverse slope, guiding the water through a transverse drainage pipe (3), discharging accumulated water of the water collecting blind ditch to roadbed drainage ditches (4) on two sides of the roadbed, and finally guiding the water through the roadbed drainage ditches (4) to discharge the water out of a highway drainage system.
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Application publication date: 20201027 |