Composite anti-seepage system for loess gully type household garbage landfill

Abstract

A composite anti-seepage system for a loess gully type household refuse landfill relates to the technical field of refuse landfill anti-seepage, and comprises an interwoven geotextile protective layer laid on the inner wall of a landfill ditch, an HDPE (high-density polyethylene) anti-seepage film arranged above the interwoven geotextile protective layer, two non-woven geotextile protective layers and a filtrate collecting layer arranged above the HDPE anti-seepage film at the bottom of the landfill ditch, and an anti-seepage layer arranged above the filtrate collecting layer. Fixing grooves are transversely distributed in the landfilling ditch side slope of the interwoven geotechnical cloth protection layer, C-shaped clamping grooves are formed in the fixing grooves, the HDPE impermeable film laid on the landfilling ditch side slope is fixed to the side slope through self-adaptive cramps, and the allowance of the HDPE impermeable film is folded and placed in an opening of each C-shaped clamping groove. The modified loess liner layer meets the requirement of the landfill for permeability, local materials are used, and the manufacturing cost is reduced; the anti-permeability of the slope anti-seepage system is enhanced by using the modified loess building blocks; the HDPE impermeable film is fixed through the self-adaptive cramps, enough allowance is reserved for sinking of the HDPE impermeable film in the C-shaped clamping grooves, and the film body cannot be torn when the landfill layer sinks.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage landfill anti-seepage, in particular to a composite anti-seepage system for loess gully type domestic garbage landfill. Background Art

[0002] Most domestic waste landfills in the Loess Plateau are located at the heads of loess gullies. The following problems exist in the construction of loess gully landfills: First, a large amount of clay is required for the anti-seepage liner of the landfill, but there is a lack of clay in the loess area; second, the slopes on both sides of the loess gully are steep or even nearly vertical, and the current compacted clay anti-seepage liner cannot be constructed, and the anti-seepage system is inherently insufficient, which increases the risk of filtrate leakage; third, there is seepage near the slope at the bottom of the gully, and the existing sand and gravel groundwater diversion layer cannot be constructed on the slope; fourth, the gully slope is high and steep, and the height of the HDPE membrane laid at one time is large, and the tensile strength of the HDPE membrane is low. Under the action of its own weight and the compression and settlement of the landfill layer, the membrane body, especially the anchor nails, will be torn, becoming a filtrate leakage channel. Utility Model Content

[0003] In order to overcome the shortcomings of the background technology, the utility model discloses a composite anti-seepage system for loess gully type domestic waste landfill. The utility model arranges a woven geotextile protective layer on the inner wall of the landfill ditch, arranges an HDPE anti-seepage membrane above the woven geotextile protective layer, and arranges two layers of non-woven geotextile protective layers and a filtrate collection layer above the HDPE anti-seepage membrane at the bottom of the landfill ditch, so as to achieve the purpose of preventing the membrane from being torn when the landfill layer sinks during garbage landfill.

[0004] In order to achieve the purpose of the utility model, the utility model adopts the following technical solutions:

[0005] A composite anti-seepage system for loess gully-type domestic waste landfills, comprising a woven geotextile protective layer laid on the inner wall of a landfill trench, an HDPE anti-seepage membrane arranged above the woven geotextile protective layer, two layers of non-woven geotextile protective layers arranged above the HDPE anti-seepage membrane at the bottom of the landfill trench, a filtrate collection layer arranged between the two layers of non-woven geotextile protective layers, fixing grooves laterally distributed on the slope of the landfill trench of the woven geotextile protective layer, each fixing groove being provided with a C-shaped clamping groove, the C-shaped clamping groove fixing the woven geotextile protective layer in the fixing groove, the HDPE anti-seepage membrane laid on the slope of the landfill trench being fixed to the slope by adaptive pins, the length of the HDPE anti-seepage membrane between two adjacent fixing grooves being greater than the distance between the two fixing grooves, and the excess of the HDPE anti-seepage membrane being folded and placed in the opening of each C-shaped clamping groove.

[0006] The bottom of the landfill ditch is composed of a foundation, a water-sand-gravel diversion layer and a modified loess liner. The foundation is compacted by a loess layer. A water-sand-gravel diversion layer is provided above the foundation. A modified loess liner is provided above the water-sand-gravel diversion layer. The side slope of the landfill ditch is composed of a rear slope surface, a drainage board diversion layer and a modified loess block layer. The rear slope surface is compacted by a loess layer. A drainage board diversion layer is laid on the rear slope surface. The lower end of the drainage board diversion layer passes through the modified loess liner and is connected to the water-sand-gravel diversion layer. A modified loess block layer is laid on the drainage board diversion layer. The fixing groove is arranged on the modified loess block layer.

[0007] The modified loess permeability coefficient is not greater than 1.0×10 -7 cm / d.

[0008] The strength of the modified loess blocks is not less than 5Mpa.

[0009] The C-shaped clamping groove is a hollow cylindrical structure, and a through groove parallel to the axis is provided on the side of the C-shaped clamping groove.

[0010] The drainage board guide layer is composed of a PVC drainage board and a non-woven geotextile protective layer, and the PVC drainage board is covered with the non-woven geotextile protective layer.

[0011] The adaptive buckle consists of an upper plate, a lower plate, a push rod, an HDPE reinforcement layer and an adjuster. An HDPE reinforcement layer is provided between the upper plate and the lower plate. The upper surface of the upper plate is provided with an adjuster, and the lower surface of the lower plate is provided with a push rod. The lower end of the push rod is arranged in the modified loess block layer.

[0012] The HDPE anti-seepage membrane laid on the slope of the landfill ditch is distributed with an HDPE covering membrane. The HDPE covering membrane is matched with the adaptive buckle nails. The HDPE covering membrane covers the corresponding adaptive buckle nails. The HDPE covering membrane is provided with reserved holes.

[0013] The utility model discloses a composite anti-seepage system for a loess gully-type domestic waste landfill. The utility model has strong practicability and is very convenient to use. Through XXXXX, it is convenient for XXXXXX. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the utility model;

[0015] Figure 2 This is a schematic diagram of the positional relationship between the adaptive buckle and the HDPE anti-seepage membrane of the utility model;

[0016] Figure 3 This is a schematic diagram of the positional relationship between the HDPE anti-seepage membrane and the HDPE reinforcement layer of the present utility model;

[0017] Figure 4 This is a cross-sectional view of the diversion layer of the groundwater drainage board of the present utility model;

[0018] In the figure: 1. Foundation; 2. Water-sand-gravel diversion layer; 3. Modified loess liner; 4. Interwoven geotextile; 5. HDPE anti-seepage membrane; 6. Non-woven geotextile; 7. Filtrate collection layer; 8. Back slope; 9. Drainage board diversion layer; 10. Modified loess block layer; 11. Adaptive buckle; 12. Fixing groove; 13. C-type clamping groove; 14. HDPE covering membrane; 15. Regulator; 16. Upper plate; 17. HDPE reinforcement layer; 18. Lower plate; 19. Top rod; 20. Reserved hole; 21. PVC drainage board. DETAILED DESCRIPTION

[0019] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0020] Combined with attachment Figures 1 to 4 A composite anti-seepage system for loess gully-type domestic waste landfills includes a woven geotextile 4 laid on the inner wall of the landfill trench, an HDPE anti-seepage membrane 5 provided above the woven geotextile 4, two layers of non-woven geotextiles 6 provided above the HDPE anti-seepage membrane 5 at the bottom of the landfill trench, a filtrate collection layer 7 provided between the two layers of non-woven geotextiles 6, fixed grooves 12 distributed laterally on the slope of the landfill trench, each fixed groove 12 is provided with a C-shaped clamping groove 13, the C-shaped clamping groove 13 fixes the woven geotextile 4 in the fixed groove 12, the HDPE anti-seepage membrane 5 laid on the slope of the landfill trench is fixed to the slope by adaptive pins 11, the length of the HDPE anti-seepage membrane 5 between two adjacent fixed grooves 12 is greater than the distance between the two fixed grooves 12, and the excess of the HDPE anti-seepage membrane 5 is folded and placed in the opening of each C-shaped clamping groove 13.

[0021] The bottom of the landfill ditch is composed of a foundation 1, a water-sand-gravel diversion layer 2 and a modified loess liner 3. The foundation 1 is compacted by a loess layer. A water-sand-gravel diversion layer 2 is provided above the foundation 1. A modified loess liner 3 is provided above the water-sand-gravel diversion layer 2. The landfill ditch slope is composed of a rear slope surface 8, a drainage board diversion layer 9 and a modified loess block layer 10. The rear slope surface 8 is compacted by a loess layer. A drainage board diversion layer 9 is laid on the rear slope surface 8. The lower end of the drainage board diversion layer 9 passes through the modified loess liner 3 and is connected to the water-sand-gravel diversion layer 2. A modified loess block layer 10 is laid on the drainage board diversion layer 9, and a fixing groove 12 is provided on the modified loess block layer 10.

[0022] The modified loess permeability coefficient is not greater than 1.0×10 -7 cm / d, the modified loess layer meets the permeability requirements of the landfill and can be made from local materials to reduce construction costs.

[0023] The strength of the modified loess blocks is not less than 5Mpa.

[0024] The C-shaped clamping groove 13 is a hollow cylindrical structure. A through groove parallel to the axis is provided on the side of the C-shaped clamping groove 13. The HDPE anti-seepage membrane 5 is folded through the through groove with the remaining space between the two fixed grooves and placed in the C-shaped clamping groove 13.

[0025] The drainage board guide layer 9 is composed of a PVC drainage board 21 and a non-woven geotextile 6. The PVC drainage board 21 is covered with a non-woven geotextile 6. The drainage board guide layer 9 guides the groundwater seeping from the slope into the water-sand and gravel guide layer 2, thereby improving the stability of the slope and the slope anti-seepage system.

[0026] The adaptive buckle 11 is composed of an upper plate 16, a lower plate 18, a push rod 19, an HDPE reinforcement layer 17 and an adjuster 15. The HDPE reinforcement layer 17 is provided between the upper plate 16 and the lower plate 18. The HDPE anti-seepage membrane 5 is arranged between the upper plate 16 and the lower plate 18 and is sleeved on the HDPE membrane reinforcement layer 17. The upper surface of the upper plate 16 is provided with a adjuster 15, and the lower surface of the lower plate 18 is provided with a push rod 19. The lower end of the push rod 19 is arranged in the modified loess block layer 10.

[0027] An HDPE covering film 14 is distributed on the HDPE anti-seepage membrane 5 laid on the slope of the landfill ditch. The HDPE covering film 14 is arranged in conjunction with the adaptive buckle 11. The HDPE covering film 14 covers the corresponding adaptive buckle 11. The HDPE covering film 14 is provided with reserved holes 20.

[0028] The composite anti-seepage system for a loess gully-type domestic waste landfill described in the embodiment comprises the following steps: during use, the flat ground at the bottom of the landfill ditch is compacted to form a foundation 1, and the steep slope is trimmed to form a back slope 8. A water-sand-gravel diversion layer 2 is laid at the bottom of the ditch, and a drainage board diversion layer 9 is laid on the back slope 8. A compacted modified loess liner layer 3 is filled on the bottom water-sand-gravel diversion layer 2, and a modified loess block layer 10 is laid and installed on the drainage board diversion layer 9. The modified loess has a permeability coefficient of no more than 1.0×10 -7cm / d, the strength of the modified loess block is not less than 5Mpa, a fixing groove 12 is opened in the modified loess block layer 10 of the rear slope 8, and then the interwoven geotextile 4 is laid, and the interwoven geotextile 4 is pressed into the fixing groove 12 with the C-shaped clamping groove 13, and the adaptive buckle 11 is installed into the modified loess block layer 10. The lower plate 18 fixes the interwoven geotextile 4 on the rear slope 8, and then the HDPE anti-seepage membrane 5 is laid, and the HDPE membrane reinforcement layer 17 is pasted at each adaptive buckle 11 and a hole is opened. After the upper plate 16 and the regulator 15 are installed on the lower plate 18, the HDPE covering film 14 is pasted on the outside of the upper plate 16, and the HDPE anti-seepage membrane 5 is inserted into the C-shaped clamping groove 13. The lower row of adaptive buckle nails 11 are installed in sequence and the HDPE anti-seepage membrane 5 is inserted into the opening of the C-shaped clamping groove 13 to complete the HDPE membrane laying, and then the non-woven fabric is laid. Geotextile 6, after laying the filtrate collection layer 7 on the non-woven geotextile 6 at the bottom of the ditch, a second layer of non-woven geotextile 6 is laid on it to complete the composite anti-seepage system, and subsequent landfill operations can be carried out. The drainage board diversion layer 9 can guide the groundwater seeping out of the slope into the water and gravel diversion layer 2 at the bottom of the ditch, thereby improving the stability of the slope and the slope anti-seepage system. The modified loess liner layer 3 meets the permeability requirements of the landfill, and local materials can be used to reduce construction costs. The use of the modified loess block layer 10 enhances the impermeability of the slope anti-seepage system. The slope adaptive rivets 11 fix the HDPE anti-seepage membrane 5, allowing the HDPE anti-seepage membrane 5 to slide downward by not less than 150mm. The HDPE anti-seepage membrane 5 is inserted into the C-shaped clamping groove 13 to leave enough margin for the HDPE anti-seepage membrane 5 to sink, and the insertion amount is not less than 200mm. The membrane will not be torn when the landfill layer sinks.

[0029] The parts of the present invention that are not described in detail are prior art. Although the present invention is specifically demonstrated and introduced in conjunction with the preferred implementation scheme, there are many methods and ways to implement the technical solution. The above is only a preferred implementation scheme of the present invention. However, technical personnel in the relevant field should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the attached claims, and all of them are within the scope of protection of the present invention.

Claims

1. A composite anti-seepage system for loess gully-type domestic waste landfill, characterized by: The invention comprises a woven geotextile (4) laid on the inner wall of a landfill trench, a HDPE anti-seepage membrane (5) arranged above the woven geotextile (4), two layers of non-woven geotextile (6) arranged above the HDPE anti-seepage membrane (5) at the bottom of the landfill trench, a filtrate collection layer (7) arranged between the two layers of non-woven geotextile (6), fixed grooves (12) distributed transversely on the slope of the landfill trench, each fixed groove (12) is provided with a C-shaped clamping groove (13), the C-shaped clamping groove (13) fixes the woven geotextile (4) in the fixed groove (12), the HDPE anti-seepage membrane (5) laid on the slope of the landfill trench is fixed to the slope by adaptive buckles (11), the length of the HDPE anti-seepage membrane (5) between two adjacent fixed grooves (12) is greater than the distance between the two fixed grooves (12), and the excess of the HDPE anti-seepage membrane (5) is folded and placed in the opening of each C-shaped clamping groove (13).

2. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 1, characterized in that: The landfill trench bottom is composed of a foundation (1), a water-sand-gravel diversion layer (2) and a modified loess cushion layer (3); the foundation (1) is compacted by a loess layer; a water-sand-gravel diversion layer (2) is provided above the foundation (1); a modified loess cushion layer (3) is provided above the water-sand-gravel diversion layer (2); the landfill trench side slope is composed of a rear slope surface (8), a drainage board diversion layer (9) and a modified loess block layer (10); the rear slope surface (8) is compacted by a loess layer; a drainage board diversion layer (9) is laid on the rear slope surface (8); the lower end of the drainage board diversion layer (9) passes through the modified loess cushion layer (3) and is connected to the water-sand-gravel diversion layer (2); a modified loess block layer (10) is laid on the drainage board diversion layer (9); and a fixing groove (12) is provided on the modified loess block layer (10).

3. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 2, characterized in that: The modified loess permeability coefficient is not greater than 1.0×10 -7 cm / d.

4. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 2, characterized in that: The strength of the modified loess blocks is not less than 5Mpa.

5. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 1, characterized in that: The C-shaped clamping groove (13) is a hollow cylindrical structure, and a through groove parallel to the axis is provided on the side surface of the C-shaped clamping groove (13).

6. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 2, characterized in that: The drainage board guide layer (9) is composed of a PVC drainage board (21) and a non-woven geotextile (6), and the PVC drainage board (21) is covered with the non-woven geotextile (6).

7. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 1, characterized in that: The self-adaptive fastener (11) is composed of an upper plate (16), a lower plate (18), a push rod (19) and a regulator (15). The HDPE anti-seepage membrane (5) is arranged between the upper plate (16) and the lower plate (18) and is sleeved on the HDPE membrane reinforcement layer (17). The upper surface of the upper plate (16) is provided with the regulator (15), and the lower surface of the lower plate (18) is provided with a push rod (19). The push rod (19) passes through the HDPE anti-seepage membrane (5) and is arranged in the modified loess block layer (10).

8. The composite anti-seepage system for loess gully-type domestic waste landfill according to claim 7, characterized in that: An HDPE covering film (14) is distributed on the HDPE anti-seepage film (5) laid on the landfill ditch slope. The HDPE covering film (14) is arranged in conjunction with the adaptive buckle nail (11). The HDPE covering film (14) covers the corresponding adaptive buckle nail (11). A reserved hole (20) is provided on the HDPE covering film (14). An HDPE film reinforcement layer (17) is provided between the HDPE anti-seepage film (5) and the HDPE covering film (14). The HDPE film reinforcement layer (17) is arranged between the upper plate (16) and the lower plate (18).

Images