CN217460160U - Transverse drainage blind ditch for asphalt pavement base - Google Patents

Abstract

The utility model discloses a transverse drainage blind ditch of a bituminous pavement base layer, wherein a drainage blind ditch is arranged in a cement stabilized base layer, a bitumen waterproof layer is laid at the bottom of the drainage blind ditch, the lower surface of the bitumen waterproof layer is contacted with the cement stabilized base layer, a drainage pipe is attached to the upper surface of the bitumen waterproof layer, one end of the drainage pipe extends into the inner side of the drainage blind ditch and is provided with a gap with the drainage blind ditch, and the other end of the drainage pipe extends out of the roadbed; a reverse filtering layer is laid on the top of the drainage blind ditch, and the upper surface of the geotextile reverse filtering layer is contacted with the asphalt surface layer; be equipped with the scour prevention stone pad on the road bed, scour prevention stone pad and the other end adaptation of drain pipe. The utility model discloses can greatly reduce construction maintenance time for the drainage french drain and excavation can be accomplished with laying in one day, reduce the influence of construction to the traffic, can reduce the safety risk in the work progress simultaneously, effectively alleviate bituminous paving water damage condition, improve bituminous paving life, be worth using widely.

Description

Transverse drainage blind ditch for asphalt pavement base

Technical Field

The utility model relates to a highway bituminous paving engineering technical field especially relates to a horizontal drainage french drain of bituminous paving basic unit.

Background

In the long-term operation process of the asphalt pavement, water is difficult to enter the interior of the asphalt pavement in a free mode, and under the repeated action of the dynamic load of the vehicle, the water entering the interior of the pavement continuously generates dynamic water pressure to promote the asphalt mixture to fall and loosen, so that water damage diseases such as pits, sludging and the like are formed. If the diseases are repaired and treated without discharging water in the pavement, the diseases can be repeatedly caused and cannot be radically treated.

The drainage blind ditch is arranged in the asphalt pavement, so that water in the pavement can be effectively drained, but the existing blind ditch is generally arranged on a pavement subbase layer or a lower base layer, the bottom of the blind ditch is leveled by adopting cement mortar, and a permeable water-stable layer is used as the base layer, so that the construction and maintenance time is long, and the drainage blind ditch is inconvenient to implement on the constructed road, particularly on a road section with busy traffic.

The cement stabilized gravel layer is adopted as the base layer on most of asphalt pavements in China, and the investigation discovers that the water tightness of the cement stabilized gravel layer is better relative to an asphalt pavement layer, water is easy to accumulate in the base layer and the pavement layer after entering the asphalt pavement layer, the asphalt pavement layer and the water stabilized base layer are damaged under the repeated action of vehicle load, if a blind ditch can be designed to discharge water permeating the asphalt pavement layer, the water damage condition of the asphalt pavement layer can be effectively relieved, and the service life of the asphalt pavement layer is prolonged.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a horizontal drainage french drain of bituminous paving basic unit.

The utility model provides a following technical scheme: the utility model provides a horizontal drainage french drain of bituminous paving basic unit, includes stable basic unit of pitch surface course, water and road bed, the stable basic unit upper surface of pitch surface course lower surface and water is laminated mutually, the stable basic unit lower surface of water is laminated mutually with the road bed, its characterized in that: the water stabilization base layer is internally provided with a drainage blind ditch filled with graded broken stones, the bottom of the drainage blind ditch is paved with an asphalt waterproof layer, the lower surface of the asphalt waterproof layer is in contact with the water stabilization base layer, the upper surface of the asphalt waterproof layer is attached with the drainage pipe, one end of the drainage pipe extends into the inner side of the drainage blind ditch and is provided with a gap, and the other end of the drainage pipe extends out of the roadbed; a reverse filtering layer is laid on the top of the drainage blind ditch, and the upper surface of the geotextile reverse filtering layer is in contact with the asphalt surface layer; and an anti-scouring pad stone is arranged on the roadbed and is matched with the other end of the drainage pipe.

Preferably, the inverted filter layer is permeable geotextile.

Preferably, the width of the drainage blind ditch is 50-60 cm, and the thickness is more than 16 cm; the particle size of the broken stone of the filling graded broken stone is 10-20 mm, the mud content is not more than 5%, and the sand content is not more than 4%.

Preferably, the drain pipe is a porous HDPE pipe, and the diameter of the drain pipe is 100 mm; and the outer side of the drain pipe is coated with permeable geotextile.

Preferably, the distance between the drain pipe and the inner side of the drain blind ditch is 10-15 cm; the length of the drainage end of the drainage pipe extending out of the outer side of the roadbed is 10-15 cm.

Preferably, the thickness of pitch waterproof layer is about 1cm, the pitch waterproof layer includes synchronous rubble seal of SBS and tarpaulin, the synchronous rubble seal of SBS pastes and locates drainage french drain bottom, the synchronous rubble seal upper surface of SBS pastes and is equipped with the tarpaulin, the tarpaulin upper surface with the drain pipe contact.

Preferably, the lateral gradient of the bottom of the drainage blind ditch is more than 4%.

Preferably, the anti-scouring pad stone is made of C15 cement mortar and has the size of 20 x 10 cm.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model discloses a establish the drainage french drain in the upper basal layer of pitch surface course below, adopt the rubble to fill the french drain setting, drainage french drain bottom adopts synchronous rubble seal of SBS and tarpaulin scheme, when precipitation or other accidents caused the surface ponding, most road surface ponding is directly discharged through the cross slope of road bed, after a small part road surface ponding permeates the water stabilization basic unit through the pitch surface course, further permeate the drainage french drain, arrange to the outlet end through drainage pipe and rush to the scour prevention bed stone, prevent that ponding from rushing into the road bed directly and influence the structural stability of road bed, compare with the conventional art, this technical scheme can greatly reduce the construction maintenance time, make drainage french drain and excavation and lay and can accomplish in one day, reduce the influence of construction to the traffic, can reduce the safety risk in the work progress simultaneously;

(2) the utility model discloses a setting can effectively alleviate the bituminous paving water damage condition with the infiltration of bituminous paving surface course log raft play, improves bituminous paving life, is worth using widely.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a longitudinal section of the water outlet of the utility model.

Detailed Description

As shown in fig. 1 to 2, an asphalt surface course 1, a water stabilization base course 2, a roadbed 3, a drainage blind ditch 4, an asphalt waterproof layer 5, a drainage pipe 6, a reverse filter layer 7 and an anti-scouring pad stone 8.

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.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 2, the lower surface of the asphalt surface course 1 is attached to the upper surface of the water-stable base course 2, and the lower surface of the water-stable base course 2 is attached to the roadbed 3, which is characterized in that: the water stabilization base layer 2 is internally provided with a drainage blind ditch 4, graded broken stones are filled in the drainage blind ditch 4, an asphalt waterproof layer 5 is laid at the bottom of the drainage blind ditch 4, the lower surface of the asphalt waterproof layer 5 is contacted with the water stabilization base layer 2, the upper surface of the asphalt waterproof layer 5 is attached with the drainage pipe 6, one end of the drainage pipe 6 extends into the inner side of the drainage blind ditch 4, a gap is reserved between the drainage pipe and the drainage blind ditch, and the other end of the drainage pipe 6 extends out of the roadbed 3; a reverse filtering layer 7 is laid on the top of the drainage blind ditch 4, and the upper surface of the geotextile reverse filtering layer 7 is in contact with the asphalt surface layer 1; be equipped with scour prevention bed stone 8 on the road bed 3, scour prevention bed stone 8 and the 6 other end adaptations of drain pipe.

The reverse filter layer 7 is a permeable geotextile.

The width of the drainage blind ditch 4 is 50-60 cm, and the thickness is more than 16 cm; the particle size of the broken stone of the filling graded broken stone is 10-20 mm, the mud content is not more than 5%, and the sand content is not more than 4%. The drain pipe 6 is a porous HDPE pipe, and the diameter of the drain pipe 6 is 100 mm; the outside of the drain pipe 6 is coated with permeable geotextile.

The distance between the drain pipe 6 and the inner side of the drain blind ditch 4 is 10-15 cm; the length of the water discharge end of the water discharge pipe 6 extending out of the roadbed 3 is 10-15 cm.

The thickness of the asphalt waterproof layer 5 is about 1cm, the asphalt waterproof layer 5 comprises an SBS synchronous broken stone seal layer and waterproof cloth, the SBS synchronous broken stone seal layer is attached to the bottom of the drainage blind ditch 4, the waterproof cloth is attached to the upper surface of the SBS synchronous broken stone seal layer, and the upper surface of the waterproof cloth is in contact with the drainage pipe 6; the transverse gradient of the bottom of the drainage blind ditch 4 is more than 4 percent, and the asphalt waterproof layer 5 can effectively prevent accumulated water from flowing into the roadbed 3, thereby protecting the stability of the roadbed 3.

The anti-scouring pad stone 8 is made of C15 cement mortar, and the size is 20X 10 cm.

In the concrete construction, the utility model discloses a construction method as follows:

s1, spreading hot modified SBS (styrene butadiene styrene) asphalt with the thickness of about 1cm at the bottom of the drainage blind ditch 4, then spreading gravel with single grain size (5-10 mm), rolling at high temperature to enable the waterproof layer modified asphalt to float upwards, changing the white gravel with single grain size into black gravel, covering waterproof cloth to form an asphalt waterproof layer 5, leveling the groove and ensuring the gradient of 4%;

s2, wrapping the special drainage pipe 6 with a permeable geotextile, placing the wrapped special drainage pipe into a leveled groove, and arranging the drainage pipe 6 with a hole side facing upwards and a hole side facing downwards to ensure that the water seepage of the pavement structure can flow into the drainage pipe 6, wherein the water outlet end of the drainage pipe 6 needs to extend out of the pavement slope of the roadbed 3 by 15 cm;

s3, filling broken stones in the drainage blind ditch 4: the macadam is made of continuous grading materials, the particle size is 10-20 mm, the mud content is not more than 5%, and the sand content is not more than 4%;

s4, paving a reverse filtering layer 7 made of permeable geotextile on the top of the drainage blind ditch 4;

s5, paving the asphalt surface layer 1 layer by layer, and compacting layer by layer;

s6, backfilling a shoulder: after the permeable geotextile is laid in the drainage blind ditch 4, backfilling soil layer by layer and tamping layer by layer;

s7, paving an anti-scouring pad stone 8: digging a small pit with the length of 20cm, the width of 20cm and the depth of 10cm below the outlet of the side slope drainage pipe 6, filling the pit with C15 mortar, scraping, paving geotextile, and preserving for 3 days.

The utility model discloses an establish upper base course in pitch surface course 1 below with drainage french drain 4, adopt the rubble to fill the french drain setting, drainage french drain 4 bottoms adopt synchronous rubble seal of SBS and waterproof cloth scheme, when precipitation or other accidents appear and cause the road surface ponding, most road surface ponding is direct to be discharged through the cross slope of road bed 3, the sub-part road surface ponding passes through behind pitch surface course 1 infiltration to the steady base course 2 of water, further infiltration to drainage french drain 4, arrange to the outlet end through drainage pipe 6 and dash on the protecting against shock pad stone 8, prevent that ponding from directly rushing into the structural stability that road bed 3 influences road bed 3.

Compared with the prior art, this technical scheme can greatly reduce construction maintenance time for the drainage french drain can be accomplished with digging and laying in one day, reduces the influence of construction to the traffic, can reduce the safety risk in the work progress simultaneously, the utility model discloses a setting can be discharged the infiltration of asphalt surface layer's log off, effectively alleviates the asphalt pavement water harm condition, improves asphalt pavement life, is worth using widely.

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 (8)

1. The utility model provides a horizontal drainage french drain of bituminous paving basic unit, includes pitch surface course (1), the stable basic unit of water (2) and road bed (3), pitch surface course (1) lower surface is laminated mutually with the stable basic unit of water (2) upper surface, the stable basic unit of water (2) lower surface is laminated mutually with road bed (3), its characterized in that: the water stabilization base layer is characterized by further comprising a drainage blind ditch (4), an asphalt waterproof layer (5), a drainage pipe (6), an inverted filter layer (7) and an anti-scouring pad stone (8), wherein the drainage blind ditch (4) is formed in the water stabilization base layer (2), graded broken stones are filled in the drainage blind ditch (4), the asphalt waterproof layer (5) is laid at the bottom of the drainage blind ditch (4), the lower surface of the asphalt waterproof layer (5) is in contact with the water stabilization base layer (2), the drainage pipe (6) is attached to the upper surface of the asphalt waterproof layer (5), one end of the drainage pipe (6) extends into the inner side of the drainage blind ditch (4) and is provided with a gap, and the other end of the drainage pipe extends out of the roadbed (3); a reverse filtering layer (7) is laid on the top of the drainage blind ditch (4), and the upper surface of the geotextile reverse filtering layer (7) is in contact with the asphalt surface layer (1); be equipped with scour prevention bed stone (8) on road bed (3), scour prevention bed stone (8) with drain pipe (6) other end adaptation.

2. The transverse drainage blind ditch for the asphalt pavement base layer as claimed in claim 1, wherein: the inverted filter layer (7) is made of permeable geotextile.

3. The transverse drainage blind ditch for the asphalt pavement base layer as claimed in claim 2, characterized in that: the width of the drainage blind ditch (4) is 50-60 cm, and the thickness is more than 16 cm; the particle size of the broken stone of the filling graded broken stone is 10-20 mm, the mud content is not more than 5%, and the sand content is not more than 4%.

4. The transverse drainage blind ditch for the asphalt pavement base layer according to claim 3, characterized in that: the drain pipe (6) is a porous HDPE pipe, and the diameter of the drain pipe (6) is 100 mm; and the outer side of the drain pipe (6) is coated with permeable geotextile.

5. The transverse drainage blind ditch for the asphalt pavement base layer as claimed in claim 4, wherein: the distance between the drain pipe (6) and the inner side of the drainage blind ditch (4) is 10-15 cm; the length of the drainage end of the drainage pipe (6) extending out of the outer side of the roadbed (3) is 10-15 cm.

6. The transverse drainage blind ditch for the asphalt pavement base layer as claimed in claim 1, wherein: the thickness of pitch waterproof layer (5) is about 1cm, pitch waterproof layer (5) include synchronous rubble seal of SBS and tarpaulin, the synchronous rubble seal of SBS pastes and locates drainage french drain (4) bottom, the synchronous rubble seal upper surface of SBS pastes and is equipped with the tarpaulin, the tarpaulin upper surface with drain pipe (6) contact.

7. The transverse drainage blind ditch for the asphalt pavement base layer as claimed in claim 5, wherein: the transverse gradient of the bottom of the drainage blind ditch (4) is more than 4 percent.

8. The transverse drainage blind ditch for the asphalt pavement base layer as claimed in claim 1, wherein: the anti-scouring pad stone (8) is made of C15 cement mortar, and the size is 20 x 10 cm.

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