CN215629081U

CN215629081U - A structure that is used for inside impervious drainage of high embankment

Info

Publication number: CN215629081U
Application number: CN202122087450.7U
Authority: CN
Inventors: 朱旭飞; 王克法; 赵丽君; 赵海燕; 宋科
Original assignee: Shaoxing Chengtou Renewable Resources Co ltd; University of Shaoxing
Current assignee: Shaoxing Chengtou Renewable Resources Co ltd; University of Shaoxing
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-01-25
Anticipated expiration: 2031-08-30

Abstract

The utility model discloses a structure for anti-seepage drainage in a high embankment, which comprises a blind ditch arranged in the embankment along the width direction of the embankment, wherein the cross section of the blind ditch is in a trapezoid shape with a wide upper part and a narrow lower part; two cloth films are laid on the bottom surface of the blind ditch; lateral permeable geotextiles are laid on two sides of the blind ditch; a gravel layer and a coarse sand layer are sequentially filled in the blind ditch from bottom to top, and a middle permeable geotextile is arranged between the gravel layer and the coarse sand layer; the bottom surface of the blind ditch is provided with a slope with a low center and two high sides along the ditch width direction, and a drainage pipe with holes is arranged at the lowest point and is positioned between the upper layer permeable geotextile and the impermeable geomembrane in the two cloth-one membranes. According to the utility model, through the structure retention gradient, water flows from high to low positions without manual intervention for drainage, and the blockage of a drainage channel can be effectively prevented through layer-by-layer filtration.

Description

A structure that is used for inside impervious drainage of high embankment

Technical Field

The utility model belongs to the technical field of construction of constructional engineering, particularly belongs to the technical field of road drainage engineering construction, and particularly relates to a structure for seepage-resistant drainage in a high embankment.

Background

In the highway engineering construction of China, a large amount of high embankment construction exists, and is influenced by roadbed filling, a filling process, drainage facilities and rainfall, so that rainwater seeps into a roadbed structure and is difficult to discharge, the roadbed filling is soaked by the rainwater, the shear strength and the compressive strength are reduced, the roadbed is unevenly settled, serious people can cause local water soaking instability of an embankment side slope, landslide occurs, and potential safety hazards are buried in later-period operation. Therefore, the hidden danger should be eliminated in time during construction. In the construction of high embankment, the blind ditch is usually arranged as one of the methods for solving the problems, for example, the Chinese utility model patent 'a high fill embankment drainage blind ditch (CN 212316714U)' builds a solid drainage channel by rubble and cement mortar, although the drainage purpose can be achieved, the building work of the blind ditch is more complicated, and is not beneficial to quality control. The utility model discloses a Chinese invention patent 'a lateral embankment drainage construction method (CN 105256684A)' which is to install a water seepage pipeline by drilling after the construction is finished, belongs to a post-treatment measure for drainage treatment when the construction is not carried out, and has more complex steps and is uneconomical. The current blind drain has the problems of complicated method, overhigh construction cost, difficult control of construction quality and the like due to the existence of a masonry structure and a multi-layer reverse filter layer.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a structure for seepage-resistant drainage in a high embankment, which reduces the cost to the maximum extent under the condition of improving the working performance of a blind ditch and is used for solving the problem of drainage in a roadbed.

The technical problem of the utility model is mainly solved by the following technical scheme: a structure for seepage-resistant drainage in a high embankment comprises a blind ditch arranged in the embankment along the width direction of the embankment, wherein the cross section of the blind ditch is in a trapezoid-like shape with a wide upper part and a narrow lower part;

two cloth-one films are laid on the bottom surface of the blind ditch, and each cloth-one film comprises two layers of permeable geotextile and a waterproof geomembrane positioned between the two layers of permeable geotextile; lateral permeable geotextiles are laid on two sides of the blind ditch; a gravel layer and a coarse sand layer are sequentially filled in the blind ditch from bottom to top, and a middle permeable geotextile is arranged between the gravel layer and the coarse sand layer;

the bottom surface of the blind ditch is provided with a slope with a low center and two high sides along the ditch width direction, and a drainage pipe with holes is arranged at the lowest point and is positioned between the upper layer of permeable geotextile and the impermeable geomembrane in the two cloth-one membranes.

Preferably, the embankment filling layer where the blind ditches are located is provided with a transverse slope with an arched middle, and the gradient of the transverse slope is 0.1-0.3%.

Preferably, the distance between adjacent blind ditches is 30-50 m; the embankment filling layer where the blind ditches between the adjacent blind ditches are located is provided with a longitudinal slope with an arch in the middle, and the gradient of the longitudinal slope is 0.1-0.3%.

Preferably, the slope gradient of the bottom surface of the blind ditch along the width direction of the ditch is 3%.

Preferably, the bottom surface of the blind ditch is provided with a middle arched slope with the gradient of 1% along the length direction of the ditch.

Preferably, the drainage pipe with the hole is a hard PVC pipe, the inner diameter of the drainage pipe is 40 mm-100 mm, and the wall thickness of the drainage pipe is 5 mm-8 mm.

Preferably, water inlet holes are uniformly formed in the top and two sides of the drainage pipe with the holes.

Preferably, the diameter of the water inlet holes is 8 mm-12 mm, and the distance along the length direction of the pipe is 50 mm-100 mm.

Preferably, the particle size of the broken stone in the broken stone layer is 50 mm-100 mm, and the mud content is not more than 3%.

Preferably, the coarse sand in the coarse sand layer has a grain diameter of 5 mm-10 mm and a mud content of not more than 3%.

Compared with the prior art, the utility model has the advantages that:

1. according to the utility model, through the structure retention gradient, water flows from high to low positions, and manual intervention for drainage is not needed.

2. According to the utility model, the permeable geotextile is used for wrapping the outer side of the blind ditch, coarse sand, the permeable geotextile, broken stones, the geotextile on the middle upper layer of the two cloth-one film and the PVC pipe for collecting and draining water are vertically layered, so that clay, silt and fine sand in the blind ditch can be fully filtered, and the blockage caused by silt deposition of the blind ditch can be effectively avoided.

3. The utility model has the advantages of economical material, simple construction process and good drainage and anti-permeability effect.

Drawings

Fig. 1 is a schematic view of the structure of an embankment according to the present invention.

FIG. 2 is a schematic cross-sectional view of the blind trench of the present invention.

FIG. 3 is an enlarged view of A in FIG. 2,

In the figure: 1. blind ditches; 2. two cloth films are used; 3. geotextile with water permeable side surface; 4. a crushed stone layer; 5. the middle part is permeable geotextile; 6. a coarse sand layer; 7. a water discharge pipe with holes; 8. and an embankment filling layer where the blind ditches are located.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further specifically described below by way of embodiments in combination with the accompanying drawings.

Example (b): a structure for impervious drainage in a high embankment is shown in figures 1-3 and comprises a blind ditch 1 arranged in the embankment along the width direction of the embankment, wherein the cross section of the blind ditch 1 is in a trapezoid shape with a wide upper part and a narrow lower part, two cloth membranes 2 are laid on the bottom surface, lateral permeable geotextiles 3 are laid on two sides of the blind ditch 1, the lower half part of the ditch is relatively filled with a gravel layer 4, the middle part of the ditch is laid with a layer of permeable geotextile 5, and the upper half part of the ditch is filled with a coarse sand layer 6.

In the above structure, the two cloth-one films 2 are laid at the bottom of the blind ditch 1 as a water-impermeable layer, the two cloth-one films 2 comprise two layers of permeable geotextiles and a water-impermeable geomembrane positioned between the two layers of permeable geotextiles, and a water discharge pipe 7 with holes is arranged between the upper layer of permeable geotextile and the water-impermeable geomembrane.

In the embodiment, the embankment filling layer 8 where the blind ditches are located is transversely provided with a transverse slope with an arched middle part, and the gradient of the transverse slope is 0.1-0.3%; the number of the blind ditches is vertically arranged according to rainfall, the distance between every two adjacent blind ditches is preferably 30-50 m, a embankment filling layer 8 where the blind ditches between every two adjacent blind ditches are located is provided with a longitudinal slope with an arched middle, the gradient of the longitudinal slope is 0.1% -0.3%, and the blind ditches are arranged at the lowest point of the longitudinal slope. The direction of water flow is guided through the slope design of the embankment filling layer 8 where the blind ditches are located.

In the embodiment, the bottom surface of the blind ditch 1 is provided with slopes with a lower center and two higher sides along the width direction of the ditch, the gradient is 3%, and the perforated drain pipe 7 is positioned at the lowest position in the middle, so that running water can conveniently enter the perforated drain pipe 7; the bottom of the blind ditch 1 is left with a 1 percent slope of a middle arch slope along the length direction of the ditch to form a height difference of the middle arch with high inside and low outside, so that the flowing water in the drainage pipe 7 with holes can be conveniently discharged to two sides.

In this embodiment, the permeable geotextile, the side permeable geotextile 3, and the middle permeable geotextile 5 in the two-cloth-one film 2 are nonwoven geotextiles having good water permeability.

In this embodiment, the perforated drain pipe 7 is a rigid PVC pipe with an inner diameter of 40mm to 100mm and a wall thickness of 5mm to 8 mm. The top and the two sides of the water discharge pipe 7 with holes are evenly provided with water inlet holes, the diameter of each water inlet hole is 8-12 mm, and the distance along the length direction of the pipe is 50-100 mm.

In the embodiment, the particle size of the broken stone in the broken stone layer 4 is 50 mm-100 mm, and the mud content is not more than 3%; the grain diameter of coarse sand in the coarse sand layer 6 is 5 mm-10 mm, and the mud content is not more than 3%.

In the embodiment, the construction is carried out according to the following steps:

s1, constructing a embankment filling layer 8 where the blind ditches are located, and reserving a cross slope and a longitudinal slope during roadbed filling construction;

s2, carrying out blind ditch groove excavation on the embankment filling layer 8 where the blind ditches are located, respectively reserving slopes in the ditch length direction and the ditch width direction at the bottom of the blind ditches 1, carrying out slope excavation on the ditch walls, enabling the sections of the blind ditches to be trapezoidal, enabling the included angle between the lower bottom and adjacent filler to be larger than 90 degrees, and leveling the slope surfaces of the ditch walls;

s3, laying two cloth membranes 2 as impervious layers at the bottom of the blind ditch 1, placing a perforated drain pipe 7 between the upper layer of permeable geotextile and the impervious geomembrane, and placing the perforated drain pipe 7 at the lowest position of the center to serve as a collecting and draining facility; the side wall of the blind ditch 1 is paved with lateral permeable geotextile 3, the bottom of the lateral permeable geotextile 3 and the node of the two cloth membranes 2 are made into an L shape, the lateral permeable geotextile 3 is arranged on the upper part, the two cloth membranes 2 are arranged on the lower part, and the lap joint length is not less than 300 mm;

s4, filling a permeable material, filling broken stones into the lower half part of the blind ditch, filling the crushed stone layer 4 to the 1/2 part of the blind ditch for rough leveling, laying the middle permeable geotextile 5, and turning up the middle permeable geotextile 5 at the joint of the ditch wall for 300mm to be tightly attached to the ditch wall; and (3) filling coarse sand in the upper half part of the blind ditch 1, backfilling to an embankment filling layer 8 where the blind ditch is located, and leveling and compacting.

According to the utility model, water flow in the embankment is automatically discharged through the height difference, the two cloth membranes 2 are used as waterproof materials to prevent the water flow from seeping downwards, the internal water flow is discharged through the hard PVC perforated drain pipe 7, the coarse sand, the broken stone and the permeable geotextile are used to form a drainage seepage channel, and the water flow is filtered, so that the PVC pipe is prevented from being blocked, and a good drainage effect is achieved. The drainage system is simple and convenient to construct, economical and practical and suitable for large-scale application in high embankment engineering.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the utility model is not limited to the above-described embodiments, but that many variations are possible. Any simple modification and modification of the above embodiments in accordance with the technical spirit of the present invention should be considered as falling within the scope of the present invention.

Claims

1. A structure for seepage-resistant drainage in a high embankment is characterized by comprising a blind ditch arranged in the embankment along the width direction of the embankment, wherein the cross section of the blind ditch is in a trapezoid shape with a wide upper part and a narrow lower part;

2. The structure for impervious drainage inside a high embankment according to claim 1, wherein the embankment filling layer where the blind ditches are located is provided with a transverse slope with an intermediate arch, and the gradient of the transverse slope is 0.1-0.3%.

3. The structure for the internal permeation-resistant drainage of the high embankment according to claim 1, wherein the distance between the adjacent blind ditches is 30 to 50 m; the embankment filling layer where the blind ditches between the adjacent blind ditches are located is provided with a longitudinal slope with an arch in the middle, and the gradient of the longitudinal slope is 0.1-0.3%.

4. The structure for permeation-resistant drainage inside a high-road embankment according to claim 1, wherein the slope gradient of the bottom surface of the blind ditch in the width direction of the ditch is 3%.

5. The structure for high embankment internal seepage-resistant drainage according to claim 1, wherein the blind ditch bottom surface is provided with a middle arched slope with a slope of 1% along the length direction of the ditch.

6. The structure of claim 1, wherein the perforated drain pipe is a rigid PVC pipe having an inner diameter of 40mm to 100mm and a wall thickness of 5mm to 8 mm.

7. The structure for impervious drainage inside a high-way embankment according to claim 1 or 6, wherein the perforated drainage pipe is provided with water inlet holes at the top and both sides thereof.

8. The structure of claim 7, wherein the water inlet holes have a diameter of 8mm to 12mm and a distance along the length of the pipe of 50mm to 100 mm.

9. The structure of claim 1, wherein the crushed stone in the crushed stone layer has a particle size of 50mm to 100mm and a mud content of not more than 3%.

10. The structure of claim 1, wherein the coarse sand layer has a coarse sand grain size of 5mm to 10mm and a mud content of not more than 3%.