CN210887246U - Roadbed slope protection structure - Google Patents

Roadbed slope protection structure Download PDF

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Publication number
CN210887246U
CN210887246U CN201921495397.0U CN201921495397U CN210887246U CN 210887246 U CN210887246 U CN 210887246U CN 201921495397 U CN201921495397 U CN 201921495397U CN 210887246 U CN210887246 U CN 210887246U
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slope
road
roadbed
drainage
layer
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CN201921495397.0U
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Chinese (zh)
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陈刚
费广宝
姜安
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Lanhai Construction Group Co ltd
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Lanhai Construction Group Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/60Planning or developing urban green infrastructure

Abstract

The utility model relates to a roadbed side slope protective structure, including road bed and side slope, the roadbed upper berth is equipped with the cement layer, the side slope sets up at the road bed edge, be equipped with concrete layer on the inclined plane of side slope, the side slope bottom is fixed with the domatic escape canal that is used for the drainage, be equipped with the drainage subassembly on the cement layer, the drainage subassembly is including seting up the mounting groove on the cement layer, set up on the cement layer and with the road surface escape canal of mounting groove intercommunication and be fixed in road surface escape canal bottom and with the drain pipe of road surface escape canal intercommunication, the lower extreme of drain pipe runs through the cement layer in proper order, the road bed, side slope and concrete layer and. The utility model discloses in, during rainy day, rainwater on the cement layer flows to the road surface escape canal along the installation groove in, discharges in the drainage pipe flows to domatic escape canal and along domatic escape canal afterwards to this makes rivers on the road surface in time discharge, has avoided the rainwater to ooze down along the roadbed, thereby makes the roadbed side slope suffer to erode the phenomenon, has improved the safety and the stability of roadbed side slope.

Description

Roadbed slope protection structure
Technical Field
The utility model belongs to the technical field of the slope protection device technique and specifically relates to a side slope protective structure of roadbed.
Background
The roadbed side slope is an inclined plane which is formed by connecting two sides of the cross section of the roadbed with the ground, can maintain the strength and stability of the roadbed of the highway, reduces the occurrence of diseases of the roadbed of the highway, ensures the driving safety and has an important function. Water is an important factor causing instability of a side slope and also a main natural factor damaging a highway subgrade and a road surface, and storm runoff can damage a highway and related facilities. The infiltration of accumulated water in the road side slope and the rising of capillary water in the soil body can cause the wet and soft side slope and the reduced strength, and heavy people can cause the side slope to collapse and collapse, even cause the whole roadbed side slope to slide along the inclined substrate, and seriously affect the safety and stability of the roadbed and the pavement.
The utility model discloses a chinese utility model patent that publication number is CN209099377U discloses a road bed side slope protective structure, including concrete layer and inoxidizing coating, concrete layer lays the surface at the road bed side slope, inoxidizing coating fixed mounting still includes the water proof membrane in the concrete layer outside, the fixed surface that sets up at concrete layer of water proof membrane, the inoxidizing coating includes the afforestation module, the afforestation module is regular hexagon, afforestation module center department sets up afforestation hole one, set up the wash port one that communicates afforestation hole one on the side of afforestation module, the mutual butt of afforestation module, the wash port one between the mutual butt face of afforestation module communicates each other.
Among the above-mentioned technical scheme, concrete layer has stability and guard action to the road bed side slope, and the water proof membrane can avoid the rainwater to infiltrate down road bed side slope or road bed. However, in the above technical scheme, the concrete layer and the waterproof membrane can only separate the rainwater on the slope surface, so that the rainwater is prevented from seeping into the roadbed from the slope surface, the rainwater on the road surface cannot be prevented from directly seeping into the underground, and the roadbed side slope is easily washed by the rainwater seeped into the road surface after a long time, thereby affecting the safety and stability of the roadbed side slope.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a side slope protective structure of roadbed can effectually arrange surface gathered water to domatic escape canal in, has reduced the emergence of rainwater washout side slope phenomenon to the security and the stability of side slope of roadbed have been improved.
The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a road bed side slope protective structure, includes road bed and side slope, the road bed upper berth is equipped with the cement layer, the side slope sets up at the road bed edge, be equipped with the concrete layer that is used for preventing soil erosion and water loss on the inclined plane of side slope, the side slope bottom is fixed with the domatic escape canal that is used for the drainage, be equipped with the drainage subassembly on the cement layer, the drainage subassembly including offer on the cement layer and along the mounting groove of road bed length direction extension, offer on the cement layer and with the road surface escape canal of mounting groove intercommunication and be fixed in road surface escape canal bottom and with the drain pipe of road surface escape canal intercommunication, the lower extreme of drain pipe runs through cement layer, road bed, side slope and concrete layer in proper order and with domatic escape canal.
Through adopting above-mentioned technical scheme, during rainy day, rainwater on the cement floor flows to the road surface escape canal along the installation groove in, discharges in the domatic escape canal and along domatic escape canal through the drain pipe flow afterwards to this rivers on making the road surface in time discharge, avoided the rainwater to ooze down along the roadbed, thereby make the road bed side slope suffer to erode the phenomenon, improved the safety and the stability of road bed side slope.
The utility model discloses further set up to: install filtering component in the mounting groove, filtering component is including being fixed in the protective fence in the mounting groove.
Through adopting above-mentioned technical scheme, protective fence can filter the rainwater that gets into in the road surface escape canal, has avoided bulky debris to get into in the road surface escape canal to this has reduced the possibility that the drain pipe blockked up, thereby has guaranteed filter assembly's normal work.
The utility model discloses further set up to: the filter assembly further comprises a circular filter screen fixed at the bottom of the pavement drainage ditch, and the bottom surface of the circular filter screen is attached to the upper end of the drainage pipe.
Through adopting above-mentioned technical scheme, circular filter screen can filter the rainwater that gets into in the drain pipe, has further reduced the possibility that the drain pipe blockked up to make the rainwater on road surface can discharge smoothly in the domatic escape canal.
The utility model discloses further set up to: the road bed is connected the department with the side slope and is installed protection component, protection component is including inlaying gusset plate and waterproofing membrane of locating in the road bed, waterproofing membrane sets up in the one side of keeping away from the side slope, just gusset plate and waterproofing membrane's upper surface all is fixed with cement layer bottom surface.
Through adopting above-mentioned technical scheme, utilize waterproofing membrane to separate road bed and side slope to support waterproofing membrane through the gusset plate, with this possibility that has reduced moisture infiltration side slope in the road bed, thereby avoided the bank protection to receive the condition emergence that moisture influences and damage in the road bed, improved the security and the steadiness of bank protection.
The utility model discloses further set up to: install the bank protection subassembly on the concrete layer, the bank protection subassembly is including the arch skeleton that is fixed in the concrete layer surface and the arc that is fixed in arch skeleton lower extreme, the arch skeleton is provided with a plurality ofly along the domatic length direction of side slope, every all fill in the arch skeleton has planting soil layer, the distance between the surface that concrete layer one side was kept away from to the arc and the concrete layer is greater than the distance between the surface that concrete layer one side was kept away from to the arch skeleton and the concrete layer.
By adopting the technical scheme, the workers plant green plants in the planting soil layer, and soil in the planting soil layer is consolidated by using the plants, so that water and soil loss is prevented; in addition, the distance between the surface of the side, far away from the concrete layer, of the arc-shaped plate and the concrete layer is larger than the distance between the surface of the side, far away from the concrete layer, of the arched framework and the concrete layer, when the planting soil layer is washed by water flow, the planting soil layer is accumulated on the upper surface of the arc-shaped plate, and therefore the good effect of preventing soil loss is achieved.
The utility model discloses further set up to: and a drainage groove for drainage is formed in the concrete layer between the adjacent arched frameworks.
Through adopting above-mentioned technical scheme, the rainwater that falls on the side slope can follow arch skeleton upper surface and flow to the water drainage tank in to this is convenient for discharge the rainwater on the side slope, has reduced the washing phenomenon of rainwater to planting soil layer.
The utility model discloses further set up to: the slope protection assembly further comprises a planting net fixed on the arch-shaped framework.
Through adopting above-mentioned technical scheme, planting the net and can playing the vegetation's of being convenient for effect, can play good retaining soil effect again, avoided the condition of soil erosion and water loss to a certain extent to take place.
The utility model discloses further set up to: a plurality of water seepage holes are formed in the arc-shaped plate, and geotextile is fixed on the arc-shaped surface of the upper side of the arc-shaped plate.
Through adopting above-mentioned technical scheme, when the rainwater falls to planting soil layer on, rivers flow to the arc upper surface along the slope, and geotechnological cloth is made by dacron short fiber acupuncture, has good gas permeability and water permeability to this makes rivers discharge after through the infiltration hole, can cut off soil particles, fine sand, little building stones etc. simultaneously effectively, thereby keeps the stability of soil and water engineering.
To sum up, the utility model discloses a beneficial technological effect does:
1. in the scheme, in rainy days, rainwater on the cement layer flows into the road surface drainage ditch along the installation groove, then flows into the slope drainage ditch through the drainage pipe and is discharged along the slope drainage ditch, so that water flow on the road surface is timely discharged, rainwater is prevented from seeping downwards along a roadbed, the roadbed side slope is washed, and the safety and the stability of the roadbed side slope are improved;
2. in the scheme, the roadbed and the side slope are separated by the waterproof coiled material, and the waterproof coiled material is supported by the reinforcing plate, so that the possibility that water in the roadbed permeates into the side slope is reduced, the condition that the slope protection is damaged due to the influence of the water in the roadbed is avoided, and the safety and the stability of the slope protection are improved;
3. in this scheme, when the rainwater falls to planting soil layer on, the rivers flow to the arc upper surface along the slope, and geotechnological cloth is made by dacron short fiber acupuncture, has good gas permeability and water permeability to this makes rivers discharge after through the infiltration hole, can cut off soil particles, fine sand, little building stones etc. simultaneously effectively, thereby keeps the stability of soil and water engineering.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1 taken along line A-A.
Reference numerals: 1. a roadbed; 2. side slope; 21. a concrete layer; 3. a cement layer; 4. slope drainage ditches; 5. a drainage assembly; 51. mounting grooves; 52. a road drainage ditch; 53. a drain pipe; 6. a filter assembly; 61. a protective fence; 62. a circular filter screen; 7. a guard assembly; 71. a reinforcing plate; 72. waterproof coiled materials; 73. perforating; 8. a slope protection assembly; 81. an arched framework; 82. an arc-shaped plate; 821. a water seepage hole; 83. planting a net; 84. geotextile; 85. planting a soil layer; 9. a water drainage groove.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, for the utility model discloses a side slope protection structure of roadbed, including roadbed 1, lay in the side slope 2 at the edge of roadbed 1 and lay in the cement layer 3 of roadbed 1 upper surface. Concrete layers 21 are evenly laid on the slope surfaces of the side slopes 2 and used for placing slope surface water and soil loss, and slope surface drainage ditches 4 are fixed at the bottoms of the side slopes 2. The slope drainage ditch 4 is formed by paving cement, the cross section of the slope drainage ditch is U-shaped, and the extension direction of the slope drainage ditch 4 is consistent with the length direction of the roadbed 1, and the slope drainage ditch is used for draining slope accumulated water into a drainage system.
As shown in fig. 2, a drainage assembly 5 is provided on the cement layer 3, and the drainage assembly 5 includes a mounting groove 51, a road surface drainage ditch 52 and a drainage pipe 53. The mounting groove 51 is opened along the upper surface of the cement layer 3, the cross section of the mounting groove is rectangular, and the extending direction of the mounting groove 51 is consistent with the length direction of the roadbed 1. The road surface drainage ditch 52 is arranged at the bottom of the mounting groove 51, the cross section of the road surface drainage ditch is trapezoidal, the longitudinal section of the road surface drainage ditch is rectangular, the area of the longitudinal section of the road surface drainage ditch 52 is gradually reduced from top to bottom, and rainwater flows to the road surface drainage ditch 52 from the road surface along the mounting groove 51. The drain pipe 53 is the L shape pipe, and the upper end of drain pipe 53 is located road surface escape canal 52 bottom surface and communicates with road surface escape canal 52, and the lower extreme of drain pipe 53 runs through cement layer 3, road bed 1 and side slope 2 in proper order and communicates with domatic escape canal 4 to arrange the rainwater in the road surface escape canal 52 to domatic escape canal 4 in, arrange to drainage system afterwards.
As shown in fig. 2, the installation groove 51 is provided with a filter assembly 6, and the filter assembly 6 comprises a protective fence 61 and a circular filter screen 62. The protective fence 61 is made of stainless steel materials, the lower surface of the protective fence is fixed with the inner bottom surface of the mounting groove 51, the upper surface of the protective fence 61 is flush with the surface of the cement layer 3, and the side wall of the peripheral side of the protective fence 61 is attached to the inner side wall of the mounting groove 51 respectively, so that rainwater entering the road surface drainage ditch 52 is filtered, and the blockage of the drainage pipe 53 caused by the fact that large-volume impurities enter the road surface drainage ditch 52 is avoided. Circular filter screen 62 is circular, adopts stainless steel material to make, and its lower surface and the last fixed surface of drain pipe 53 to the rainwater that gets into in the drain pipe 53 filters, thereby has further reduced the possibility that drain pipe 53 blockked up, has guaranteed the normal drainage function of drainage subassembly 5.
As shown in fig. 1, the roadbed 1 is contacted with the side slope 2 and is provided with a protective assembly 7, wherein the protective assembly 7 comprises a reinforcing plate 71 and a waterproof coiled material 72. The reinforcing plate 71 is a square plate body which is vertically arranged, and the upper surface of the reinforcing plate 71 is fixed with the bottom surface of the cement layer 3. The waterproof roll material 72 is fixed on one side of the reinforcing plate 71, which is far away from the side slope 2, and the upper surface of the waterproof roll material is fixed with the bottom surface of the cement layer 3, in the embodiment, the waterproof roll material 72 adopts SBS modified asphalt waterproof roll material which is formed by compounding a glass fiber felt for styrene-butadiene-styrene rubber modified asphalt, a polyester felt and a glass fiber reinforced polyester felt as a base, and has excellent ultralow temperature performance, and can still keep good flexibility at the low temperature of minus 40 ℃, so that the waterproof roll material can adapt to deformation and cracking of the roadbed 1, form a high-strength waterproof layer, prevent rainwater from entering the side slope 2 from the base layer, reduce the possibility that the rainwater seeps into the base layer and then erodes the soil layer of the side slope 2, and further play a good protection role. As shown in fig. 2, the reinforcing plate 71 and the waterproof roll 72 are provided with through holes 73 for the drainage pipe 53 to pass through, so that the drainage pipe 53 can smoothly pass through the reinforcing plate 71 and the waterproof roll 72 and drain rainwater into the slope drainage ditch 4.
As shown in fig. 1, a slope protection assembly 8 is installed on the concrete layer 21, and the slope protection assembly 8 includes an arch-shaped framework 81, an arc-shaped plate 82, a planting net 83 and a geotextile 84. The arched framework 81 is U-shaped, is arranged on the concrete layer 21 and is formed by pouring C20 concrete. The cross section of the arc-shaped plate 82 is U-shaped and is also arranged on the concrete layer 21, and the upper arc-shaped surface of the arc-shaped plate 82 is fixed with the lower end of the arch-shaped framework 81. Planting soil layers 85 are filled between the arched frameworks 81 and the arc-shaped plates 82, the thickness of the planting soil layers 85 is 10cm, and grass seeds and shrub seeds are sown after the planting soil layers 85 are wetted by spraying, so that greening is realized. The planting net 83 is made of a three-dimensional vegetation net and is fixed on the lower arc surface of the arched framework 81 and the upper arc surface of the arc plate 82, the three-dimensional vegetation net is loose and flexible in texture, 90% of space is reserved for filling soil, gravel and fine stones, plant roots can penetrate through the three-dimensional vegetation net, and accordingly the planting net can grow comfortably, neatly and uniformly, and a firm green composite protective layer is formed. As shown in fig. 2, the distance between the surface of the arc 82 away from one side of the concrete layer 21 and the concrete layer 21 is greater than the distance between the surface of the arc 81 away from one side of the concrete layer 21 and the concrete layer 21, so that the soil layer washed away by a small amount of rainwater is blocked on the arc 82, the water and soil loss is reduced, and a plurality of water seepage holes 821 are formed in the arc 82, so that rainwater falling on the slope 2 of the side slope seeps downwards from the arc 82, the situation that the rainwater permeates the planting soil layer 85 due to accumulation on the arc 82 is avoided, and the water and soil loss is reduced. Geotechnological cloth 84 is fixed in on the upside arc surface of arc 82, when the rainwater falls to planting soil layer 85 on, rivers flow to arc 82 upper surface along the slope, and geotechnological cloth 84 is made by dacron short fiber acupuncture, has good gas permeability and water permeability to this makes rivers discharge behind the infiltration hole 821, can cut off soil particles, fine sand, little building stones etc. effectively simultaneously, thereby keeps the stability of soil and water engineering.
As shown in fig. 1, a plurality of water drainage grooves 9 have been seted up on concrete layer 21, water drainage groove 9's cross section is square, water drainage groove 9 sets up between adjacent arch skeleton 81, water drainage groove 9's upper end flushes with cement layer 3 surface, water drainage groove 9's lower extreme and domatic escape canal 4 intercommunication to this arranges arch skeleton 81, arc 82 and the rainwater on concrete layer 21 surface to domatic escape canal 4 in, has avoided the rainwater to store up in 2 domatic slopes, thereby produces soil erosion phenomenon.
The implementation principle of the embodiment is as follows: in rainy day, rainwater on the cement layer 3 flows to the road surface drainage ditch 52 along the mounting groove 51, flows to the domatic drainage ditch 4 through the drain pipe 53 afterwards and discharges along the domatic drainage ditch 4 to this rivers on making the road surface in time discharge, avoided the rainwater to ooze along road bed 1, thereby make the road bed side slope suffer to erode the phenomenon, improved the safety and the stability of road bed side slope.
In this scheme, come when rainy season, the rainwater flows to mounting groove 51 along cement layer 3 surface in, gets into road surface escape canal 52 afterwards to arrange to domatic escape canal 4 from drain pipe 53, in so as to avoided the rainwater to ooze to road bed 1 by the road surface in, thereby make road bed 1 suffer the emergence of rainwater erosion phenomenon. Through setting up filter assembly 6, can fully filter the rainwater that gets into in road surface escape canal 52 and the drain pipe 53 to reduce the possibility that drain pipe 53 blockked up, guaranteed drainage system's unobstructed. In addition, waterproofing membrane 72 chooses for use SBS modified asphalt waterproofing membrane, has excellent ultra-low temperature performance, still can keep good pliability under 40 ℃ below zero low temperature, can adapt to the deformation and the fracture of road bed 1, forms the waterproof layer of high strength, has avoided the rainwater to get into side slope 2 from the basic unit, has reduced the rainwater and has infiltrated the possibility that erodees 2 soil layers of side slope behind the basic unit to good guard action has been played.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims (8)

1. The utility model provides a road bed side slope protective structure, includes road bed (1) and side slope (2), road bed (1) upper berth is equipped with cement layer (3), side slope (2) set up at road bed (1) edge, be equipped with on the inclined plane of side slope (2) and be used for preventing concrete layer (21) of soil erosion and water loss, side slope (2) bottom is fixed with domatic escape canal (4) that are used for the drainage, its characterized in that: be equipped with drainage subassembly (5) on cement layer (3), drainage subassembly (5) including set up on cement layer (3) and along mounting groove (51) that road bed (1) length direction extends, set up on cement layer (3) and with road surface escape canal (52) of mounting groove (51) intercommunication and be fixed in road surface escape canal (52) bottom and with drain pipe (53) of road surface escape canal (52) intercommunication, the lower extreme of drain pipe (53) runs through cement layer (3), road bed (1), side slope (2) and concrete layer (21) in proper order and communicates with domatic escape canal (4).
2. The roadbed slope protection structure of claim 1, wherein: install filtering component (6) in mounting groove (51), filtering component (6) are including being fixed in safety fence (61) in mounting groove (51).
3. The roadbed slope protection structure of claim 2, wherein: the filter assembly (6) further comprises a circular filter screen (62) fixed to the bottom of the road surface drainage ditch (52), and the bottom surface of the circular filter screen (62) is attached to the upper end of the drainage pipe (53).
4. The roadbed slope protection structure of claim 1, wherein: roadbed (1) meets with side slope (2) and locates to install protection component (7), protection component (7) are including inlaying gusset plate (71) and waterproofing membrane (72) of locating in roadbed (1), waterproofing membrane (72) set up in the one side of keeping away from side slope (2), just the upper surface of gusset plate (71) and waterproofing membrane (72) all is fixed with cement layer (3) bottom surface.
5. The roadbed slope protection structure of claim 1, wherein: install bank protection subassembly (8) on concrete layer (21), bank protection subassembly (8) are including being fixed in arch skeleton (81) on concrete layer (21) surface and being fixed in arc (82) of arch skeleton (81) lower extreme, arch skeleton (81) are provided with a plurality ofly along the domatic length direction of side slope (2), every all fill in arch skeleton (81) and have planting soil layer (85), distance between surface and concrete layer (21) of concrete layer (21) one side is kept away from in arc (82) is greater than the distance between surface and concrete layer (21) of concrete layer (21) one side are kept away from to arch skeleton (81).
6. The roadbed slope protection structure of claim 5, wherein: and a drainage groove (9) for draining water is formed in the concrete layer (21) between the adjacent arched frameworks (81).
7. The roadbed slope protection structure of claim 5, wherein: slope protection subassembly (8) still including being fixed in planting net (83) on arch skeleton (81).
8. The roadbed slope protection structure of claim 5, wherein: a plurality of water seepage holes (821) are formed in the arc-shaped plate (82), and geotextile (84) is fixed on the arc-shaped surface of the upper side of the arc-shaped plate (82).
CN201921495397.0U 2019-09-09 2019-09-09 Roadbed slope protection structure Active CN210887246U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111887110A (en) * 2020-07-13 2020-11-06 中徽生态环境有限公司 Ecological restoration method based on accumulated water and divided-flow bare geology
CN111919622A (en) * 2020-08-12 2020-11-13 刘建军 Highway slope greening system
CN112267484A (en) * 2020-11-04 2021-01-26 刘涛 A drainage system that is used for highway side slope that possesses good reinforcement effect
CN112681346A (en) * 2020-12-20 2021-04-20 魏秀芹 Road bridge engineering roadbed side slope protection structure
CN112695777A (en) * 2020-12-29 2021-04-23 河南中天交通设施研发有限公司 Highway side slope protection system
CN113403904A (en) * 2021-07-21 2021-09-17 中信国安建工集团有限公司 Highway filling and digging boundary roadbed structure and construction operation method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111887110A (en) * 2020-07-13 2020-11-06 中徽生态环境有限公司 Ecological restoration method based on accumulated water and divided-flow bare geology
CN111919622A (en) * 2020-08-12 2020-11-13 刘建军 Highway slope greening system
CN112267484A (en) * 2020-11-04 2021-01-26 刘涛 A drainage system that is used for highway side slope that possesses good reinforcement effect
CN112681346A (en) * 2020-12-20 2021-04-20 魏秀芹 Road bridge engineering roadbed side slope protection structure
CN112695777A (en) * 2020-12-29 2021-04-23 河南中天交通设施研发有限公司 Highway side slope protection system
CN113403904A (en) * 2021-07-21 2021-09-17 中信国安建工集团有限公司 Highway filling and digging boundary roadbed structure and construction operation method

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