Roadbed and pavement drainage engineering structure

Abstract

The utility model discloses a roadbed and pavement drainage engineering structure which comprises a medial strip drainage unit and a roadbed drainage unit which are located in the middle of a road. The medial strip drainage unit comprises a longitudinal sewer, a water collecting well and a transverse drainage pipe; the longitudinal sewers are communicated with the water-collecting wells, and transverse drainage pipes are mounted in the water-collecting wells; the roadbed drainage unit comprises a side ditch, an intercepting ditch, a drop, a torrent groove and a drainage ditch, and the torrent groove is used for connecting upper water flow and lower water flow at the position where the surface slope is large; the catchwater is located on a slope of an excavation road section, the drainage ditch is located on a fill road section, side ditches on the side edges of the earth shoulder converge to the drainage ditch through torrent grooves, and the catchwater converges to the drainage ditch through drop water; and the other side edge of the earth shoulder is provided with a rhombic grid protection slope or an arched protection slope. Therefore, the drainage of the medial strip and the drainage of the roadbed can be integrated, so that the drainage of the roadbed and the pavement is smoother, and the stability and the safety of the mountain and the roadbed are improved.

Description

Technical Field

[0001] The utility model relates to the field of drainage in the construction of road hillside excavation, and specifically relates to a drainage engineering structure for subgrade and road surface. Background Art

[0002] When highway construction needs to pass through mountain structures, the common practice is to excavate along the surface of the mountain to form the foundation of the highway and the slopes on the roadside. After the road surface is paved on the subgrade of the highway, drainage is involved both between the highway and the slopes and inside the road. Since the slopes are usually designed as inclined planes, for the slopes or subgrade, better stability is required. Therefore, for this field, a drainage system that can meet this requirement needs to be arranged, otherwise its stability will be affected, thus affecting its safety. However, the existing drainage system only opens drainage ditches on both sides of the subgrade, and cannot take into account the drainage of the central isolation belt and the overall drainage of the subgrade. Content of the Utility Model

[0003] Therefore, to solve the above deficiencies, the utility model provides a drainage engineering structure for subgrade and road surface here, which takes into account the drainage of the central isolation belt and the subgrade as a whole, so that the drainage of the subgrade and road surface is smoother, thereby improving the stability and safety of the mountain and the subgrade.

[0004] The utility model is realized as follows. A drainage engineering structure for subgrade and road surface is constructed, which includes a central isolation belt drainage unit and a subgrade drainage unit located in the middle of the road; the central isolation belt drainage unit includes a longitudinal infiltration ditch, a catch well, and a transverse drainage pipe; there are multiple catch wells, the longitudinal infiltration ditch is connected with the catch wells, and a transverse drainage pipe is installed in the catch wells; the subgrade drainage unit includes a side ditch, a catch ditch, a drop structure, a chute, and a drainage ditch. The chute is used for connecting the upper and lower water flows at places with a large surface slope; the catch ditch is located on the hillside of the excavation section, the drainage ditch is located in the filling section, and the side ditch on the side of the earthen shoulder is collected into the drainage ditch through the chute, and the catch ditch is collected into the drainage ditch through the drop structure; a diamond grid slope protection or an arch slope protection is arranged on the other side of the earthen shoulder, and a subgrade side ditch is opened at the bottom of the diamond grid slope protection or the arch slope protection. The road surface water naturally overflows from the road crown and is discharged outside the earthen shoulder, and then flows into the subgrade side ditch along the chute of the diamond grid slope protection or the water collecting trough of the arch slope protection framework and is discharged.

[0005] Furthermore, the transverse drainage pipes connected to the catch wells are arranged in the road surface, and the outlet ends of the transverse drainage pipes correspond to the side ditches and the subgrade side ditches on both sides respectively.

[0006] Furthermore, the transverse drainage pipes include UPVC pipes with a diameter of Φ200mm or UPVC with a diameter of Φ160mm.

[0007] Furthermore, the structure of the chute is as follows: the surface of the chute is plastered with M7.5 cement mortar, the stilling sill at the water outlet is built with C20 plain concrete, the bottom of the chute is built into a rough surface, built with cobblestones, protruding 10 cm from the bottom of the chute, and a expansion joint is set every 8 - 10 m of the chute, and waterproof treatment is carried out with asphalt hemp rope.

[0008] Furthermore, the road structures on both sides of the central divider drainage unit include subgrade, C20 concrete foundation, C20 concrete abutment cap, C20 concrete encapsulation, cushion layer, road surface base course, and road surface wearing course; the C20 concrete abutment cap is poured on the C20 concrete foundation, and the C20 concrete encapsulation wraps the horizontal drain pipe, and above the C20 concrete encapsulation are the cushion layer, road surface base course, and road surface wearing course.

[0009] Furthermore, a shaft cover plate is also set on the central divider drainage unit, and the corrugated beam guardrail posts are installed; a catch basin is set every 100 - 150 meters, the water collected in the central divider is collected by the gravel blind ditch and the perforated corrugated pipe and introduced into the catch basin, and then discharged into the side ditch of the roadbed excavation or the arched frame catchment trough of the fill slope through the horizontal drain pipe; in the excavation section, the horizontal drain pipes are centrally set on one side of the roadbed according to the actual situation.

[0010] The utility model has the following advantages: the utility model provides a roadbed and road surface drainage engineering structure here. After design and improvement, it includes a central divider drainage unit and a roadbed drainage unit located in the middle of the road; the central divider drainage unit includes a longitudinal infiltration ditch, catch basins, and horizontal drain pipes; there are multiple catch basins, the longitudinal infiltration ditch is connected with the catch basins, and horizontal drain pipes are installed in the catch basins; the roadbed drainage unit includes side ditches, intercepting ditches, drop structures, chutes, and drainage ditches. The chute is used for connecting the upper and lower water flows at places with a large surface slope; the intercepting ditch is located on the hillside in the excavation section, the drainage ditch is located in the fill section, the side ditch on the side of the earthen shoulder is collected into the drainage ditch through the chute, and the intercepting ditch is collected into the drainage ditch through the drop structure; a diamond grid slope protection or an arched slope protection is set on the other side of the earthen shoulder, and a road embankment side ditch is opened at the bottom of the diamond grid slope protection or the arched slope protection. The road surface water naturally overflows from the road crown and drains outside the earthen shoulder, and then drains into the road embankment side ditch along the diamond grid slope protection chute or the arched slope protection frame catchment trough. Therefore, this application can take into account the central divider drainage and the roadbed drainage as a whole, so that the roadbed and road surface drainage are smoother, thereby improving the stability and safety of the mountain and the roadbed. Brief Description of the Drawings

[0011] Figure 1 is the implementation schematic diagram of the roadbed and road surface drainage project of this application;

[0012] Figure 2 is this application Figure 1 in - sectional view;

[0013] Figure 3 is this application Figure 1 in - sectional view;

[0014] Figures 4 - 5 is the elevation view of the median strip drainage in this application;

[0015] Figures 6 - 7 is the plan view of the median strip drainage in this application;

[0016] Figure 8 is the elevation view of the catch basin in this application;

[0017] Figure 9 is the cross-sectional view of the outlet of the horizontal drain pipe in this application;

[0018] Figure 10 is in this application Figure 9 sectional view A-A in.

[0019] Among them: longitudinal infiltration ditch 1, catch basin 2, horizontal drain pipe 3, side ditch 4, intercepting ditch 5, drop 6, chute 7, drainage ditch 8, embankment side ditch 9, chute 10 along the diamond grid slope protection, water collecting trough 11 of the arched slope protection framework, subgrade 12, foundation C20 concrete 13, coping C20 concrete 14, C20 encapsulating concrete 15, cushion 16, road base course 17, road surface course 18, shaft cover plate 19, corrugated beam guardrail post 20. Specific embodiments

[0020] Next, the present utility model will be described in detail in combination with the attached Figures 1 - 10 The technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0021] The present utility model provides a subgrade and road surface drainage engineering structure herein, such as Figures 1 - 10As shown in the figure, it can be implemented in the following manner; it includes a central median drainage unit and a subgrade drainage unit located in the middle of the road; the central median drainage unit includes a longitudinal infiltration ditch 1, a catch well 2, and a transverse drain pipe 3; there are multiple catch wells 2, the longitudinal infiltration ditch 1 is connected to the catch wells 2, and the transverse drain pipe 3 is installed in the catch wells 2; the subgrade drainage unit includes a side ditch 4, a catch ditch 5, a drop structure 6, a chute 7, and a drainage ditch 8, and the chute 7 is used for connecting the upper and lower water flows at places with a large surface slope; the catch ditch 5 is located on the hillside of the cut section, the drainage ditch 8 is located in the fill section, the side ditch 4 on the side of the earthen shoulder is collected into the drainage ditch 8 through the chute 7, and the catch ditch 5 is collected into the drainage ditch 8 through the drop structure 6; a diamond grid slope protection or an arch slope protection is arranged on the other side of the earthen shoulder, and an embankment side ditch 9 is opened at the bottom of the diamond grid slope protection or the arch slope protection. The road surface water naturally overflows from the road crown and is discharged outside the earthen shoulder, and then flows into the embankment side ditch 9 along the diamond grid slope protection chute 10 or the arch slope protection skeleton water collecting trough and is discharged.

[0022] In this application, the transverse drain pipes 3 connected to the catch wells 2 are arranged in the road surface, and the outlet ends of the transverse drain pipes 3 correspond to the side ditches 4 and the embankment side ditches 9 on both sides respectively.

[0023] In this application, the transverse drain pipe 3 is a UPVC pipe with a diameter of Φ200mm or a UPVC with a diameter of Φ160mm.

[0024] In this application, the structure of the chute 10 is as follows: the surface of the chute is plastered with M7.5 cement mortar, the outlet stilling sill is built with C20 plain concrete, the bottom of the chute is built into a rough surface, built with cobblestones and protruding 10cm from the bottom of the chute. A expansion joint is set every 8 - 10m of the chute and waterproof treatment is carried out with asphalt hemp rope.

[0025] In this application, the road structure on both sides of the central median drainage unit includes a subgrade 12, a foundation C20 concrete 13, a coping C20 concrete 14, a C20 encapsulating concrete 15, a cushion layer 16, a road surface base course 17, and a road surface wearing course 18; the coping C20 concrete 14 is poured on the foundation C20 concrete 13, and the C20 encapsulating concrete 15 wraps the transverse drain pipe 3 inside. The upper part of the C20 encapsulating concrete 15 is the cushion layer 16, the road surface base course 17, and the road surface wearing course 18.

[0026] In this application, a shaft cover plate 19 is also set on the central median drainage unit, and a corrugated beam guardrail column 20 is installed; a catch well is set every 100 - 150 meters. The water collected in the central median is collected and introduced into the catch well by a gravel blind ditch and a perforated corrugated pipe, and then discharged into the cut slope side ditch of the subgrade or the arch skeleton water collecting trough of the fill slope through the transverse drain pipe; in the cut section, the transverse drain pipes are centrally arranged on one side of the subgrade according to the actual situation.

[0027] Through the implementation of this application, the drainage of the central median strip and the subgrade is considered as a whole, so that the drainage of the subgrade and pavement is smoother, thereby improving the stability and safety of the mountain body and the subgrade.

[0028] Pavement drainage for general sections: In cut sections, the water on the road surface flows naturally along the road crown and drains out of the earthen shoulder and then through the side ditch; in filled sections, A. For low-filled sections with a slope height H ≤ fine, the road surface water flows naturally along the road crown and drains out of the earthen shoulder and then converges along the slope surface into the filled side ditch; B. For filled sections with a slope height H > 4m, the road surface water flows naturally along the road crown and drains out of the earthen shoulder and then converges into the filled side ditch through the water collecting trough of the diamond grid slope protection or the arched slope protection framework.

[0029] Pavement drainage for superelevation sections: The drainage of the outer side of the road surface flows along the slope of the road crown to the longitudinal drainage ditch set at the edge of the central median strip, is longitudinally introduced into the catch well, and then discharged through the transverse drainage pipe; the drainage of the inner side of the road surface is the same as that of the normal section.

[0030] Drainage of the central median strip (inside): It consists of a longitudinal drainage ditch, an anti-seepage layer, a catch well, and a transverse drainage pipe.

[0031] Subgrade drainage: It consists of side ditches, intercepting ditches, drainage ditches, drops, and chutes. Chutes are used for connecting the upper and lower water flows at places with a large surface slope.

[0032] Underground drainage: In cut sections, a blind ditch is set at the bottom of the side ditch to lower the groundwater level, and a Φ10 perforated corrugated pipe is additionally installed at the bottom of the blind ditch in sections with rich groundwater.

[0033] It should be noted that the columns of the corrugated beam guardrail in the central median strip should be buried before laying the water-proof layer to avoid damaging the water-proof layer. Otherwise, the damaged water-proof layer should be repaired in time to prevent rainwater from seeping into the subgrade and causing pavement damage. The water-proof layer is a 3-cm-thick cement mortar leveling layer plus an anti-seepage geotextile. The anti-seepage geotextile is two-layer fabric and one-layer film with a weight of 500 g / m², and its technical indicators shall be implemented according to the corresponding national standards. The greening quantity in the central median strip is included in the environmental protection project. The water collected in the central median strip is collected by the gravel blind ditch and the perforated corrugated pipe and introduced into the catch well, and then discharged into the cut side ditch of the subgrade or the arched framework water collecting trough of the filled slope through the transverse drainage pipe; in cut sections, the transverse drainage pipes are centrally set on one side of the subgrade according to the actual situation. A catch well is set every 100 - 150 meters, and its specific location can be appropriately adjusted according to the positions of bridges, culverts or arched framework water collecting troughs. Catch wells should be set at the bottom of the concave vertical curve and at the abutment in the downhill section. When installing the columns of the corrugated beam guardrail in the central median strip, the catch wells should be avoided, and the damaged slope water-proof layer should be promptly sealed to prevent rainwater from seeping into the subgrade and causing pavement damage.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roadbed and pavement drainage engineering structure, characterized in that; The invention comprises a central median drainage unit and a roadbed drainage unit located in the middle of a road; the central median drainage unit comprises a longitudinal infiltration ditch (1), a water collection well (2), and a transverse drainage pipe (3); there are a plurality of water collection wells (2), the longitudinal infiltration ditch (1) is connected to the water collection well (2), and a transverse drainage pipe (3) is installed in the water collection well (2); the roadbed drainage unit comprises a side ditch (4), an intercepting ditch (5), a waterfall (6), a rapids trough (7), and a drainage ditch (8); the rapids trough (7) is used for connecting the upper and lower water flows at a place with a large surface slope; the intercepting ditch (5 ) is located on the hillside of the excavated road section, the drainage ditch (8) is located on the filled road section, the side ditch (4) on the side of the earth shoulder is collected into the drainage ditch (8) through the rapids trough (7), and the intercepting ditch (5) is collected into the drainage ditch (8) through the waterfall (6); a diamond grid slope protection or an arch slope protection is arranged on the other side of the earth shoulder, and an embankment side ditch (9) is opened at the bottom of the diamond grid slope protection or the arch slope protection, and the road surface water is naturally overflowed by the road arch and discharged from the earth shoulder, and is collected into the embankment side ditch (9) along the diamond grid slope protection rapids trough (10) or the arch slope protection skeleton water collection trough (11) and then discharged.

2. A roadbed and pavement drainage engineering structure according to claim 1, characterized in that; A transverse drainage pipe (3) connected to the water collection well (2) is arranged in the road surface, and outlet ends of the transverse drainage pipe (3) correspond to the side ditches (4) and the embankment side ditches (9) on both sides respectively.

3. A roadbed and pavement drainage engineering structure according to claim 1, characterized in that; The transverse drainage pipe (3) comprises a Φ200 mm UPVC pipe or a Φ160 mm UPVC pipe.

4. A roadbed and pavement drainage engineering structure according to claim 1, characterized in that; The structure of the rapid flow trough (10) is as follows: the surface of the rapid flow trough is plastered with M7.5 cement mortar, the outlet force dissipation sill is built with C20 plain concrete, the bottom of the rapid flow trough is built with a rough surface, and is built with pebbles, protruding 10 cm from the bottom of the trough. An expansion joint is set every 8 to 10 m in the rapid flow trough, and waterproofing is carried out with asphalt hemp tendons.

5. A roadbed and pavement drainage engineering structure according to claim 1, characterized in that; The road structure on both sides of the central median drainage unit includes a roadbed (12), a foundation C20 concrete (13), a cap C20 concrete (14), a C20 encapsulated concrete (15), a cushion layer (16), a pavement base layer (17), and a pavement surface layer (18); the cap C20 concrete (14) is poured on the foundation C20 concrete (13), the C20 encapsulated concrete (15) wraps the transverse drainage pipe (3), and the upper part of the C20 encapsulated concrete (15) is the cushion layer (16), the pavement base layer (17), and the pavement surface layer (18).

6. A roadbed and pavement drainage engineering structure according to claim 1, characterized in that; A vertical shaft cover plate (19) is also provided on the drainage unit of the central median strip, and a corrugated beam guardrail column (20) is installed; a water collection well is provided every 100 to 150 meters, and the water collected in the central median strip is collected by a crushed gravel blind ditch and a corrugated pipe with holes and introduced into the water collection well, and then discharged into the roadbed excavation ditch or the arched skeleton water collection trough of the fill slope through a transverse drainage pipe; in the excavation section, the transverse drainage pipe is centrally provided on one side of the roadbed according to the actual situation.

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