CN219261104U

CN219261104U - Composite drainage isolation structure behind wall

Info

Publication number: CN219261104U
Application number: CN202223219342.1U
Authority: CN
Inventors: 许文辉
Original assignee: Fuzhou Luxin Highway Design Co ltd
Current assignee: Fuzhou Luxin Highway Design Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-06-27
Anticipated expiration: 2032-12-02

Abstract

The utility model provides a back composite drainage isolation structure of a wall, which comprises a drainage hole arranged on the retaining wall and a backfill layer arranged at the back of the retaining wall, wherein a drainage pipe is arranged in the drainage hole, a composite drainage isolation pad is paved between the back of the retaining wall and the backfill layer, the composite drainage isolation pad comprises non-woven geotechnical cloth, a drainage net core and a composite geotechnical film, the side surface of the composite geotechnical film is connected with the retaining wall, the drainage net core is arranged between the non-woven geotechnical cloth and the composite geotechnical film, reverse filter bags are arranged in the backfill layer and are in one-to-one correspondence with the drainage pipe, and each reverse filter bag is arranged at the pipe orifice of the corresponding drainage pipe. After the composite drainage isolation pad is arranged, the drainage capacity is superior to that of the traditional wall back drainage filter material, the construction is simple, the procedures are few, the progress is quick, the composite drainage isolation pad can serve as a safe non-corrosive permanent template, can bear long-term high-pressure load effect, and improves the safety of the retaining wall.

Description

Composite drainage isolation structure behind wall

Technical Field

The utility model relates to the technical field of retaining wall drainage, in particular to a composite drainage isolation structure behind a wall.

Background

The water drainage on the bench back of the retaining wall is smooth or not, and the safety (instability and damage) and the use effect of the retaining wall are directly affected. If the drainage behind the wall is not smooth, water accumulation is caused behind the retaining wall, so that the wall body bears additional hydrostatic pressure, and the expansion pressure of the cohesive soil filler due to the increase of the water content is enhanced; the frost heaving pressure of the filling material in the seasonal frozen area is increased, so that the reverse filtering effect of the reverse filtering layer of the retaining wall bench is one of key factors for controlling the quality of retaining wall engineering. The back of the retaining wall is basically made of 30-50 m thick crushed stone materials as a back filtering layer, and the underground water behind the wall is discharged through the water discharge holes of the retaining wall, because the retaining wall is cast in situ by adopting (reinforced) concrete or rubble concrete at present, the back of the wall needs to be reserved with the space of the crushed stone back filtering layer in the cast-in-situ process, the efficacy and construction cost of the traditional back of the wall drainage materials depend on the construction quality and the construction period completely, and according to the problems in the past, the crushed stone back filtering layer is backfilled after the retaining wall is finished, the engineering quality cannot be controlled, namely, the phenomenon of material reduction in the process of steal occurs, the phenomenon of construction is also caused without rule, and the function of a drainage system cannot be ensured. Therefore, the retaining wall in the prior art has a plurality of drainage construction procedures, and is easy to cause work stealing and material reduction, so that the underground ponding on the back of the wall body is difficult to drain, and the safety and stability of the retaining wall are reduced.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a composite drainage isolation structure behind a wall, which has the advantages of simple construction, less working procedures, fast progress and strong drainage capacity, serves as a safe and non-corrosive permanent template, and can bear long-term high-pressure load.

The utility model is realized in the following way: the utility model provides a compound drainage isolation structure behind wall, is including setting up the wash port on the retaining wall and setting up the backfill layer in retaining wall back of the wall department, be provided with the wash pipe in the wash port the wall back of retaining wall and backfill layer between laid compound drainage isolation pad, compound drainage isolation pad is including nonwoven geotechnique's cloth, drainage network core and compound geomembrane, the side of compound geomembrane is connected with the retaining wall, the drainage network core sets up between nonwoven geotechnique's cloth and compound geomembrane, be provided with in the backfill layer and strain the package, it sets up with the wash pipe one-to-one to strain the package, and each it all sets up the mouth of pipe department at the wash pipe that corresponds to strain the package to strain the back.

Further, the drainage net core comprises a three-dimensional geotechnical net core, and needle punched geotechnical fabrics are adhered to two sides of the three-dimensional geotechnical net core.

Further, the needled perforated geotextile is a filament needled geotextile.

Further, the composite geomembrane is formed by compounding a layer of impermeable geotextile and a layer of impermeable geomembrane.

Further, the composite geomembrane is formed by compounding two layers of impermeable geotextiles and one layer of impermeable geomembrane, and the impermeable geomembrane is arranged between the two layers of impermeable geotextiles.

Further, the reverse filtering bag comprises a rammed clay layer, the top of the rammed clay layer is flush with the bottom wall of the drain pipe, waterproof geotechnical cloth is arranged at the top of the rammed clay layer, a reverse filtering gravel layer is paved at the top of the waterproof geotechnical cloth, a reverse filtering gravel sand layer is paved on the outer surface of the reverse filtering gravel layer, and a reverse filtering geotechnical cloth layer is arranged on the outer side of the reverse filtering gravel sand layer.

Further, the backfill layer comprises a backfill gravel sand layer and a special wall back filling area, and the backfill gravel sand layer is arranged on one side close to the composite drainage isolation pad.

Further, the backfill layer further comprises a clay water-resisting layer, wherein the clay water-resisting layer inclines from a special backfill area of the wall back to one side of the backfill gravel sand layer, and the inclination angle of the clay water-resisting layer is 2 degrees.

Further, the dip angle of the drain pipe is 5 degrees.

The utility model has the advantages that:

1. the drainage performance is superior, and after the composite drainage isolation pad is arranged, the drainage performance is superior to that of the traditional wall back drainage filter material, and higher drainage performance can be provided.

2. The construction is simple, the use is safe and reliable, and the water drainage device can provide the pressure resistance required by design and is flexible and light while providing higher water drainage capacity. The soil nail can be nailed with the soil body without gaps, the soil nail cannot form burden to be unstable, and the soil nail can well form a whole.

3. Can serve as a safe non-corrosive permanent template, can bear long-term high-pressure load effect, and improves the safety of the retaining wall. The composite drainage isolation pad is provided with a drainage channel, so that sand and soil slurry can be effectively filtered, clean sand-free seepage can enter the drainage layer, concrete cement mortar can be effectively isolated, the mortar is prevented from entering the drainage layer, and the composite drainage isolation pad serves as a pouring template. The retaining wall poured in this way is tightly screwed with soil body, and no gap exists. The retaining wall, the composite drainage isolation pad and the soil form a whole, so that the soil-retaining wall is more stable and safer.

4. After the composite drainage isolation pad is used, the comprehensive cost is low, the construction is simple, and the cross operation and the construction period are reduced to the greatest extent.

Drawings

The utility model will be further described with reference to examples of embodiments with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the connection structure of the retaining wall and the composite drainage mat according to the present utility model;

FIG. 3 is a schematic view of the drainage network core structure of the present utility model;

FIG. 4 is a schematic view showing the construction of the retaining wall, composite drainage spacer and reverse filter pack connection according to the present utility model.

In the drawings, the components represented by the respective reference numerals are as follows:

1. a retaining wall; 2. a backfill layer; 3. a drain pipe; 4. a composite drainage isolation pad; 5. a nonwoven geotextile; 6. a drainage mesh core; 7. a composite geomembrane; 8. filtering the bag reversely; 9. a three-dimensional geonet core; 10. needling the perforated geotextile; 11. impermeable geotextile; 12. compounding an impermeable geomembrane; 13. tamping the clay layer; 14. waterproof geotextile; 15. reversely filtering the crushed stone layer; 16. reversely filtering the crushed stone sand layer; 17. reversely filtering the geotechnical cloth layer; 18. backfilling a crushed stone sand layer; 19. the back of the wall is particularly filled in the area; 20. a clay water-blocking layer.

Detailed Description

Referring to fig. 1 to 4, the post-wall composite drainage isolation structure of the present utility model comprises a drainage hole provided on a retaining wall 1 and a backfill layer 2 provided at the back of the retaining wall 1, a drainage pipe 3 is provided in the drainage hole, a composite drainage isolation pad 4 is laid between the back of the retaining wall 1 and the backfill layer 2, the composite drainage isolation pad 4 comprises a nonwoven geotextile 5, a drainage net core 6 and a composite geotextile 7, the side surface of the composite geotextile 7 is connected with the retaining wall 1, the drainage net core 6 is provided between the nonwoven geotextile 5 and the composite geotextile 7, a reverse filter bag 8 is provided in the backfill layer 2, the reverse filter bags 8 are provided in one-to-one correspondence with the drainage pipe 3, and each reverse filter bag 8 is provided at the pipe orifice of the corresponding drainage pipe 3.

Specifically, the drainage net core 6 comprises a three-dimensional geotechnical net core 9, and needle punched geotechnical fabrics 10 are adhered to two sides of the three-dimensional geotechnical net core 9. The three-dimensional geotechnical net core comprises a plurality of vertical main ribs, wherein a layer of transverse rib main ribs and transverse ribs are respectively arranged at the top and the bottom of the vertical main ribs to form a stable drainage channel, and the transverse rib main ribs can be replaced by oblique rib main ribs and the transverse ribs can be replaced by oblique ribs. The ribs play a role in supporting and protecting, ensure the smoothness of the drainage channel under the long-term load effect and ensure the requirements on the water conductivity under various different loads.

Specifically, the needled perforated geotextile 10 is a filament needled geotextile.

Specifically, the composite geomembrane 7 is formed by compounding a layer of impermeable geotextile 11 and a layer of impermeable geomembrane 12.

Specifically, the composite geomembrane 7 is formed by compounding two layers of impermeable geotextiles 11 and one layer of impermeable geomembrane 12, and the impermeable geomembrane is arranged between the two layers of impermeable geotextiles 11.

Specifically, the reverse filtering bag 8 comprises a rammed clay layer 13, the top of the rammed clay layer 13 is flush with the bottom wall of the drain pipe 3, waterproof geotechnical cloth 14 is arranged at the top of the rammed clay layer 13, a reverse filtering gravel layer 15 is paved at the top of the waterproof geotechnical cloth 14, a reverse filtering gravel sand layer 16 is paved on the outer surface of the reverse filtering gravel layer 15, and a reverse filtering geotechnical cloth layer 17 is arranged on the outer side of the reverse filtering gravel sand layer 16. The proportion of broken stone and sand in the reverse filtering broken stone sand layer is 7:3. The reverse filter bag 8 is arranged, and soil bodies behind the retaining wall can not be taken away during water seepage, so that the soil is prevented from flowing.

Specifically, the backfill layer 2 comprises a backfill gravel sand layer 18 and a special wall back filling area 19, wherein the backfill gravel sand layer 18 is arranged on one side close to the composite drainage isolation pad 4.

Specifically, the backfill layer 2 further comprises a clay water-resisting layer 20, wherein the clay water-resisting layer 20 is inclined downwards from the special filling area 19 of the wall back to one side of the backfill gravel sand layer, and the inclination angle of the clay water-resisting layer 20 is 2 degrees. The clay water-blocking layer 20 is arranged to reduce underwater infiltration and block water above the clay water-blocking layer. The inclination angle is 2 degrees, so that water can flow to the retaining wall and then be discharged through the drain pipe.

Specifically, the dip angle of the drain pipe 3 is 5 °. Above-mentioned setting can make the outside discharge of water more quick, simultaneously, also can prevent the backward flow of water.

The traditional retaining wall back drainage mainly adopts sand gravel, sand-sandwiched gravel or sand-sandwiched broken stone as bulk aggregate of the main body and non-sand concrete precast blocks. The composite drainage isolation pad has superior drainage capacity compared with the traditional wall back drainage filter material, and the drainage capacity of the 10 mm-thick composite drainage isolation pad is equivalent to that of a 300 mm-thick discrete aggregate.

Because the retaining wall material is changed from the original commonly used mortar rubble masonry into reinforced concrete or rubble concrete, the construction method is correspondingly changed from the original manual masonry into concrete subsection integral casting, and the changes lead to the fact that if the back filtering layer of the wall adopts the traditional sand gravel or sand-free concrete precast blocks and other materials, considerable difficulties or inconvenience are brought to construction, and a plurality of defects and hidden dangers exist on construction quality, the traditional wall back drainage material needs to finish the pouring of the retaining wall and then backfill discrete aggregate or other drainage materials, the construction mode is easy to generate holes or insufficient compaction, and the construction mode cannot be integrated with the original soil body. If large flood occurs, the device is extremely easy to erode, destabilize and collapse. Clogging is easy to occur for a long time, and the water drain hole is seriously blocked.

After the composite drainage spacer is arranged on the back of the retaining wall, the composite drainage spacer can provide higher drainage capacity although the composite drainage spacer is only 1/30 of the thickness of the discrete aggregate. Moreover, the composite drain spacer provides both design stress resistance and is flexible and lightweight. The nail can be nailed with soil body without gap, and can not form burden and unstability, and the nail can well form a whole with soil body, and can not erode, unstability and collapse, thereby avoiding the problem of blocking the drain pipe.

Because the retaining wall body material adopts reinforced concrete or rubble concrete, the two sides are required to be provided with pouring templates, and the space behind the wall is narrow, for example, after the pouring of the wall body is finished, the template is difficult to disassemble or demold in the construction of the back of the wall, and even the template is remained behind the wall, the template is wasted, and the construction cost is increased; and too large excavation space can backfill more filter materials, so that backfill movement is more easily caused for a long time, and soil body is unstable. The drainage function and the long-term stability of the supporting engineering are obviously affected. In addition, the corrosion or decay of the template can also affect the stress of the retaining wall structure, even cause the corrosion of concrete and the like.

The composite drainage isolation pad is provided with a drainage channel, so that sand and soil mud can be effectively filtered, clean and sand-free seepage can enter the drainage layer, concrete cement mortar can be effectively isolated, and the mortar is prevented from entering the drainage layer. The composite drainage insulation pad serves as a safe and non-corrosive permanent template. The retaining wall poured in this way is tightly screwed with soil body, and no gap exists. The retaining wall, the composite drainage isolation pad and the soil form a whole, so that the soil-retaining wall is more stable and safer.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the utility model, and that equivalent modifications and variations of the utility model in light of the spirit of the utility model will be covered by the claims of the present utility model.

Claims

1. The utility model provides a compound drainage isolation structure behind wall, including setting up drain hole and backfill layer (2) of setting in retaining wall (1) back of the wall department on retaining wall (1), its characterized in that: the drainage hole is internally provided with a drainage pipe (3), a composite drainage isolation pad (4) is paved between the back of the retaining wall (1) and the backfill layer (2), the composite drainage isolation pad (4) comprises non-woven geotechnical cloth (5), a drainage net core (6) and a composite geotechnical film (7), the side face of the composite geotechnical film (7) is connected with the retaining wall (1), the drainage net core (6) is arranged between the non-woven geotechnical cloth (5) and the composite geotechnical film (7), a reverse filtering bag (8) is arranged in the backfill layer (2), the reverse filtering bags (8) are arranged in one-to-one correspondence with the drainage pipe (3), and each reverse filtering bag (8) is arranged at the pipe orifice of the corresponding drainage pipe (3).

2. A post-wall composite drain insulation structure according to claim 1, wherein: the drainage net core (6) comprises a three-dimensional geotechnical net core (9), and needle punched geotechnical fabrics (10) are adhered to two sides of the three-dimensional geotechnical net core (9).

3. A post-wall composite drain insulation structure according to claim 2, wherein: the needled and perforated geotextile (10) is a filament needled geotextile.

4. A post-wall composite drain insulation structure according to claim 1, wherein: the composite geomembrane (7) is formed by compounding a layer of impermeable geotextile (11) and a layer of impermeable geomembrane (12).

5. A post-wall composite drain insulation structure according to claim 1, wherein: the composite geomembrane (7) is formed by compounding two layers of impermeable geotextiles (11) and one layer of impermeable geomembrane (12), and the impermeable geomembrane is arranged between the two layers of impermeable geotextiles (11).

6. A post-wall composite drainage insulation structure according to any of claims 1 to 5, wherein: the anti-package (8) of straining is including ramming clay layer (13), ramming clay layer (13) top and the diapire parallel and level of condenser tube (3), ramming clay layer (13) top is provided with waterproof geotechnique's cloth (14), anti-gravel layer (15) of straining has been laid at waterproof geotechnique's cloth (14) top, anti-gravel layer (15) of straining's surface has laid anti-gravel sand layer (16) of straining, anti-gravel sand layer (16) of straining's outside is provided with anti-geotechnique's cloth layer (17).

7. A post-wall composite drain insulation structure according to claim 6, wherein: the backfill layer (2) comprises a backfill gravel sand layer (18) and a special wall back filling area (19), and the backfill gravel sand layer (18) is arranged on one side close to the composite drainage isolation pad (4).

8. A post-wall composite drain insulation structure according to claim 7, wherein: the backfill layer (2) further comprises a clay water-resisting layer (20), the clay water-resisting layer (20) inclines from a special backfill area (19) of the back of the wall to one side of the backfill crushed stone sand layer (18), and the inclination angle of the clay water-resisting layer (20) is 2 degrees.

9. A post-wall composite drain insulation structure according to claim 1, wherein: the dip angle of the water drain pipe (3) is 5 degrees.