Water seepage and drainage system for waste slag yard

Abstract

The utility model discloses a water seepage and drainage system for a waste slag yard. In order to prevent natural disasters, drainage ditches are usually formed in the waste slag field to drain accumulated water, but the drainage effect of an existing waste slag field is not ideal. The device comprises drainage ditches arranged along the periphery of the waste slag field and a slope platform; a water seepage and drainage main pipe is arranged in the center of the slag disposal site main ditch, water seepage and drainage branch pipes are arranged in the centers of the slag disposal site branch ditches, and the water seepage and drainage main pipe is communicated with the water seepage and drainage branch pipes. The water seepage and drainage main pipe penetrates through the retaining wall, and dry rubbles are arranged on the outer side of the outlet end of the water seepage and drainage main pipe. A heat-insulating layer is arranged at the top of the water seepage and drainage main pipe, and filled soil covers the top of the heat-insulating layer; and the drainage ditch and the seepage and drainage main pipe converge into the energy dissipation pool and converge into the natural ditch after energy dissipation of the energy dissipation pool. The seepage and drainage pipe structure can effectively intercept and drain peripheral surface water, can also guide and drain underground water, is good in drainage effect, and can ensure the structural safety of the seepage and drainage pipe structure in a severe cold environment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the drainage technical field of abandoned slag field, and specifically relates to a seepage drainage system of abandoned slag field. BACKGROUND

[0002] When the amount of excavation is greater than the amount of filling and the excavation cannot be recycled, the construction project needs to select an abandoned slag field to store waste materials such as abandoned soil and abandoned stone. When the abandoned slag field is eroded by annual rainwater and surface water, a sliding surface is generated between the waste materials at the bottom of the abandoned slag field and the original ground, which easily causes landslides and other natural disasters. In order to prevent natural disasters, drainage ditches are usually arranged in the abandoned slag field to drain water, but the drainage effect of the existing abandoned slag field is not ideal. In addition, in northern areas, the outlet of the seepage pipe is not provided with a heat preservation measure, and frost heaving damage is easily caused. UTILITY MODEL CONTENT

[0003] In order to make up for the deficiencies of the prior art, the utility model provides a seepage drainage system of abandoned slag field, which can effectively intercept and drain the surrounding surface water and underground water, has good drainage effect, and can ensure the structural safety of the seepage drainage pipe structure in a severe cold environment.

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

[0005] A seepage drainage system of abandoned slag field, characterized in that: a drainage ditch is arranged along the periphery of the abandoned slag field and the platform of the slope;

[0006] A seepage drainage main pipe is arranged in the main ditch of the abandoned slag field, and a seepage drainage branch pipe is arranged in the branch ditch of the abandoned slag field, and the seepage drainage main pipe and the seepage drainage branch pipe are in communication with each other;

[0007] The seepage drainage main pipe penetrates through the retaining wall, and dry masonry stones are arranged outside the outlet end of the seepage drainage main pipe; a heat preservation layer is arranged on the top of the seepage drainage main pipe, and the heat preservation layer is covered with filled soil;

[0008] The drainage ditch and the seepage drainage main pipe converge into an energy dissipation pool, and then converge into a natural ditch after energy dissipation in the energy dissipation pool.

[0009] Further, the seepage drainage main pipe and the seepage drainage branch pipe are both modified integrated PVC pipes.

[0010] Further, the seepage drainage main pipe and the seepage drainage branch pipe are connected through a four-way joint.

[0011] Further, in the seepage drainage pipeline, the pipe bodies of the same specification are connected through flexible joints.

[0012] Further, the seepage drainage main pipe and the seepage drainage branch pipe have the same shape, that is, a door arch cross-section structure with a semicircular upper part and a rectangular lower part.

[0013] Further, the seepage drainage main pipe and the seepage drainage branch pipe are provided with a mortar cushion foundation at the bottom, are wrapped with water permeable geotextile, and are provided with a coarse sand protection layer at the top.

[0014] Further, the top surface, the slope surface and the platform of the waste dump are greened and protected.

[0015] Further, the retaining wall is provided with a water discharge hole.

[0016] The utility model discloses a seepage drainage system for waste dump, which has the advantages of good seepage drainage effect, high safety, high stability, high reliability, high economy and the like.

[0017] 1) the utility model forms seepage drainage system through seepage drainage pipe, drainage ditch and energy dissipation pool, and the drainage ditch intercepts and drains ground water, and the seepage drainage pipe leads and drains underground water, and the drainage ditch and the seepage drainage pipe finally converge into the energy dissipation pool, and after energy dissipation in the energy dissipation pool, the water is converged into natural ditch, and the seepage drainage effect is good;

[0018] 2) the seepage drainage pipe of the utility model is in the door arch section structure that upper circular lower rectangular tangential, and is provided with the inside reinforcing support, and compared with the circular seepage drainage pipe, the drainage section is big, and the structure is stable, and it is not easy to slide and deviate from the ditch center;

[0019] 3) the utility model discloses that the seepage drainage pipe outlet is provided with dry masonry flagstone layer, and the top is provided with a layer of heat preservation layer, and the structure safety of seepage drainage pipe structure is ensured under the severe cold environment;

[0020] 4) the seepage amount of the main ditch center of the waste dump of the utility model is greater than the seepage amount of the branch ditch center, and the seepage drainage pipe is divided into seepage drainage main pipe and seepage drainage branch pipe, and the main pipe is placed in the main ditch center, and the branch pipe is placed in the branch ditch center, and the engineering is more economical. DRAWINGS

[0021] Figure 1 It is the front view schematic diagram of the utility model;

[0022] Figure 2 It is the transverse section view of seepage drainage main pipe 1 in the utility model;

[0023] Figure 3 It is the detail structure view of seepage drainage pipe flexible connection joint in the utility model;

[0024] Figure 4 It is the detail structure view of rigid four-way joint between seepage drainage main pipe 1 and seepage drainage branch pipe 2 in the utility model;

[0025] Figure 5 It is the elevation view of seepage drainage main pipe 1 outlet in the utility model;

[0026] In the drawing, 1. seepage drainage main pipe, 2. seepage drainage branch pipe, 3. drainage ditch, 4. retaining wall, 5. energy dissipation pool, 6. mortar cushion foundation, 7. coarse sand protection layer, 8. dry masonry flagstone layer, 9. heat preservation layer. DETAILED DESCRIPTION

[0027] The present invention will now be described in detail with reference to specific embodiments.

[0028] This utility model forms a seepage drainage system through seepage pipes, drainage ditches, and energy dissipation pools, which can effectively intercept and drain surrounding surface water and divert groundwater. The seepage drainage pipes are connected as a whole along the center of the ditch using flexible joints, four-way joints, etc., and the joints should not be leak-proof. An insulation layer is installed at the outlet of the seepage drainage pipe to ensure the structural safety of the seepage drainage pipe structure in severe cold environments. The specific structure is as follows:

[0029] like Figure 1 As shown, the waste disposal site drainage system of this utility model includes drainage ditches 3 set along the perimeter of the waste disposal site and at the slope platform. The drainage ditches 3 are used to intercept and drain surface water. A main drainage pipe 1 is set in the center of the main ditch of the waste disposal site, and a branch drainage pipe 2 is set in the center of the branch ditch of the waste disposal site. The main drainage pipe 1 and the branch drainage pipe 2 are connected to each other, and the drainage pipes lead to the drainage of groundwater.

[0030] like Figure 5 As shown, the main drainage pipe 1 passes through the retaining wall 4 and extends outward by no less than 2m. Dry-laid rubble masonry 8 is installed on the outside of the outlet end of the main drainage pipe 1 for protection. A 0.2m thick XPS insulation layer 9 is installed on the top of the main drainage pipe 1, and the top of the insulation layer 9 is covered with backfill. The drainage ditch 3 and the main drainage pipe 1 flow into the energy dissipation pool 5, and after energy dissipation in the energy dissipation pool 5, they flow into the natural ditch.

[0031] like Figure 3 , 4 As shown, in this embodiment, both the main drainage pipe 1 and the branch drainage pipe 2 are modified integrated PVC pipes. The main drainage pipe 1 and the branch drainage pipe 2 are available in two diameters: 100mm and 300mm. Each standard pipe section is 4m long, and the longitudinal drainage slope of the system is ensured to be no less than 2% during connection. The main drainage pipe 1 and the branch drainage pipe 2 are connected via a four-way connector. In the drainage pipeline, pipes of the same specifications are connected via flexible joints. The modified integrated PVC pipe consists of a modified integrated PVC pipe body, geotextile, and protective grid. The main technical parameters of each component are as follows:

[0032] 1) Modified integrated PVC pipe body: 1. Vertical compressive strength ≥ 480kPa; 2. Ring flexibility: no cracking, no separation of double walls, no reverse bending of inner and outer walls; 3. Impact performance TIR ≤ 10%; 4. Oven test: no delamination, no cracking; 5. Density ≤ 1680kg / m³ 3 A 6mm-8mm diameter permeable hole is opened at the upper 2 / 3 position of the pipe body to guide the groundwater absorbed by the water-absorbing material into the corrugated pipe. The longitudinal hole is 40mm and the circumferential hole spacing is 40mm.

[0033] 2) The pipe body is wrapped with water-permeable geotextile on the outside for soil conservation and water permeability. The water-permeable geotextile meets the standard of "Geosynthetic Filament Spun-bonded Needle-punched Nonwoven Geotextile" GB / T 17639-2008. The main control technical indicators are: a. Tensile strength is not less than 10 kN / m; b. Unit mass is not less than 200 g / m; c. Longitudinal and transverse tensile breaking strength is not less than 10 kN / m, and bursting strength is greater than or equal to 1.8 kN. 2 ; c. Longitudinal and transverse tensile breaking strength is not less than 10 kN / m, and bursting strength is greater than or equal to 1.8 kN.

[0034] 3) The geotextile is wrapped with protective grid on the outside for preventing backfill from piercing the geotextile. The main control technical indicators are: a. Thickness is not less than 4.5 mm; b. Aperture is not greater than 5 mm x 5 mm.

[0035] The flexible joint can provide the deformation requirement of the drainage system and is made of vulcanized rubber and PVC. The expansion part is made of vulcanized rubber, and the connecting part is made of PVC resin. The main control technical indicators are: a. The length of the expansion part is less than or equal to 80 mm; b. The maximum longitudinal expansion amount is 20 mm; c. The maximum radial deformation amount is 12 mm. When installing the flexible joint, the integrity of the internal plane sealing ring at both ends of the joint should be checked. The joint should be installed axially parallel and with force to ensure that the plane sealing ring is evenly stressed. When the joint is installed in place, the nylon bolt holes are aligned and screwed in the fixed nylon bolts. The rigid four-way joint is installed in the same way as the flexible joint. When there is no branch pipe on the other side, the excess interface is sealed with a matching plug of the same specification.

[0036] As shown in Figure 2 , the main drainage pipe 1 and the branch drainage pipe 2 have the same shape, which is a door arch cross-section structure with a semi-circular upper part and a rectangular lower part tangent to each other, and a reinforcing support is arranged inside. The main drainage pipe 1 and the branch drainage pipe 2 are provided with a mortar cushion foundation 6 at the bottom, wrapped with water-permeable geotextile, and provided with a coarse sand protection layer 7 at the top.

[0037] In this embodiment, the top surface, slope surface and platform of the waste dump are greened and protected by planting shrubs and sowing grass seeds, with 1 shrub per square meter. The waste soil is compacted in layers, with a layering compaction thickness of not more than 2.0 m. The slope ratio of the waste dump is 1:2.50, the grading height is 6 m, and the compaction coefficient is not less than 0.90.

[0038] The retaining wall 4 is arranged at the narrowest downstream of the waste dump, and is poured with C35 concrete, the breast and back slope ratio of which is 1:0.25, the foundation of the retaining wall 4 is buried to a depth of not less than 1.50m; the part of the wall body which is 0.3m above the ground is provided with water discharge holes with an outward slope of 4% every 2m, the water discharge holes are made of PVC pipes with a diameter of 0.1m, and a 0.3m-thick and 0.5m-wide water-resisting layer made of the same concrete as the wall body is arranged below the lowest water discharge hole, and a 0.5m-thick water-resisting layer made of the same concrete as the wall body is arranged on the wall back within a range of 0.5m below the top of the wall. The wall back of the retaining wall is provided with a 0.3m-thick bagged sand and pebble inverse filter layer. Preferably, when the foundation of the slope retaining wall is located in a collapsible loess layer, a 1m-thick 5% cement modified soil cushion is filled at the bottom of the foundation to seal water, and the foundation pit is backfilled with 5% cement modified soil with a compaction degree of not less than 93%.

[0039] The construction method of the utility model is as follows: the sequence of the seepage and drainage pipe is site leveling→excavating foundation groove→mortar cushion→assembling the seepage and drainage pipe in sections→installing flexible joint (elbow) →installing four-way joint→installing system upstream plug (to prevent silt from entering) →backfilling coarse sand around the pipe body→backfilling and tamping.

[0040] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "arrange", "install", "connect", "connect", "fix" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0041] The content of the utility model is not limited to the examples listed in the embodiments, and any equivalent transformation of the technical scheme of the utility model adopted by the ordinary skilled in the art by reading the utility model specification is covered by the claims of the utility model.

Claims

1. A leachate drainage system for a waste disposal site, characterised in that: The drainage ditch (3) is arranged along the periphery of the waste dump and the slope platform; The waste dump is provided with a main seepage drainage pipe (1) in the main ditch and a branch seepage drainage pipe (2) in the branch ditch, and the main seepage drainage pipe (1) and the branch seepage drainage pipe (2) are communicated with each other; The main seepage drainage pipe (1) penetrates through the retaining wall (4), and the dry masonry stone (8) is arranged outside the outlet end of the main seepage drainage pipe (1); the top of the main seepage drainage pipe (1) is provided with a thermal insulation layer (9), and the top of the thermal insulation layer (9) is covered with the filled soil; The drainage ditch (3) and the main seepage drainage pipe (1) are merged into the energy dissipation pool (5), and then the water is merged into the natural ditch after the energy dissipation in the energy dissipation pool (5).

2. A drainage system for a waste disposal site according to claim 1, wherein: The main seepage drainage pipe (1) and the branch seepage drainage pipe (2) are both modified integrated PVC pipes.

3. A drainage system for a waste disposal site according to claim 2, wherein: The main seepage drainage pipe (1) and the branch seepage drainage pipe (2) are communicated through the four-way joint.

4. A drainage system for a waste disposal site according to claim 3, wherein: The pipe bodies of the same specification are connected through the flexible joint in the seepage drainage pipeline.

5. A drainage system for a waste disposal site according to claim 4, wherein: The main seepage drainage pipe (1) and the branch seepage drainage pipe (2) are of the same shape, which are the door arch cross-section structure with the upper half-circular shape and the lower rectangular shape.

6. A drainage system for a waste disposal site according to claim 5 wherein: The main seepage drainage pipe (1) and the branch seepage drainage pipe (2) are provided with the mortar cushion foundation (6) at the bottom, the water-permeable geotextile is wrapped outside, and the coarse sand protection layer (7) is arranged at the top.

7. A drainage system for a waste disposal site according to claim 6, wherein: The top surface of the waste dump, the slope surface and the platform are greened and protected.

8. A drainage system for a waste disposal site according to claim 7, wherein: The retaining wall (4) is provided with the water discharge hole.

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