Retaining wall drainage system and construction method thereof

Abstract

The present invention provides a retaining wall drainage system and a construction method thereof. The system includes a drainage channel within the retaining wall body. The drainage channel passes through the front of the retaining wall, is arranged in the backfill concrete in front of the wall, and is connected to the water inlet of the drainage ditch in front of the wall. A concrete water barrier is provided at the entrance of the drainage channel behind the retaining wall. A longitudinal water trough is provided in the concrete water barrier. The longitudinal water trough is connected to the drainage channel via a transition water trough. Permeable sandless concrete slabs are provided in three directions of the backfill soil behind the wall. A concrete sealing layer is provided on the top of the permeable sandless concrete slabs on both sides of the backfill soil. By providing the longitudinal water troughs behind the wall, the accumulated water behind the wall is effectively collected to achieve drainage and isolation functions. The provided drainage channel and transition water trough smooth the drainage channel and greatly improve the drainage effect behind the wall. The water flow surface of the drainage channel in front of the wall is lower than the top of the backfill concrete in front of the wall and the top of the ditch, preventing mud from contaminating the wall surface.

Description

Technical Field

[0001] The present invention relates to the fields of railways, highways, municipal administration, construction, foundation pits, earth excavation, and in particular to a retaining wall drainage system and a construction method thereof. Background Art

[0002] like Figure 1 As shown, in the prior art, a point-type drainage solution is used. Retaining wall 1 is generally provided with drainage holes every 2 meters in the top, bottom, left, and right directions. PVC drainage pipes 2 are inserted into the drainage holes. To prevent soil loss behind the wall, the water inlet of drainage pipe 2 is wrapped with a permeable geotextile. The wall is backfilled with backfill soil 4. A first aquiclude 5, a second aquiclude 7, and a permeable layer 6 are provided behind the wall. When water accumulates in the soil layer beyond the excavation line 3 of the slope behind the wall, it will seep into the backfill layer 4. The accumulated water in the backfill layer 4 will seep into the permeable layer 6. When the water level in the permeable layer 6 reaches the water inlet of drainage pipe 2, the accumulated water will flow through drainage pipe 2 to the front of the wall, along the surface of retaining wall 1 and the top of the backfill layer 8 in front of the wall, to the drainage ditch 9 in front of the wall, completing the drainage process behind the wall.

[0003] In the current drainage scheme, the drainage pipes 2 are generally arranged at intervals of 2m up, down, left and right. When the accumulated water reaches the water inlet of the drainage pipe 2, it can be drained, but the accumulated water between the two drainage pipes on the horizontal plane cannot be discharged smoothly. It mainly accumulates in the permeable layer 6 and eventually seeps back into the backfill layer 4, which reduces the effectiveness of the retaining wall drainage system.

[0004] A permeable layer 6 is set behind the wall to drain the accumulated water on the contact surface, but the contact surface is too small to drain water effectively. It can only drain the accumulated water in the soil layer on the contact surface, reduce the moisture content of the soil layer on the contact surface, and then gradually cause the accumulated water in the surrounding soil to penetrate into the contact surface, and the drainage path is long; an aquiclude 5 is set behind the wall, which is generally about 0.5m wide in the horizontal direction. Within this smaller width range, it is difficult to make the water level reach the height of the water inlet of the drain pipe 2 to achieve drainage. Water can easily penetrate into the surrounding soil. Only when there is a lot of water in the soil layer and the surrounding soil is saturated can a higher water level be formed on the aquiclude 5. Therefore, the drainage effect is not ideal.

[0005] In order to prevent the loss of soil particles and permeable layer particles, the water inlet of drainage pipe 2 is wrapped with permeable geotextile. The diameter of drainage pipe 2 is generally 10 cm, and the permeable area is small. The geotextile is easily blocked by fine soil, resulting in the drainage pipe being unable to drain water and the retaining wall drainage system failing; the geotextile is easily weathered, and after being damaged, it loses its function of preventing the outflow of soil particles and permeable layer particles. The outflow of soil particles and permeable layer particles behind the wall affects the stability of the soil behind the wall and is also easy to block drainage pipe 2; drainage pipe 2 and geotextile are prone to aging and damage, causing drainage pipe 2 to be blocked.

[0006] When the accumulated water behind the wall flows out through the drain pipe 2, it is mixed with mud and leaves muddy water marks on the wall when it flows out, especially the drain pipe at a high position, which affects the appearance of the wall.

[0007] Therefore, developing a retaining wall drainage system and a construction method thereof is a problem to be solved urgently. Summary of the Invention

[0008] In view of this, the present invention aims to provide a retaining wall drainage system and a construction method thereof, which can greatly improve the drainage effect behind the wall.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0010] A retaining wall drainage system includes a plurality of drainage channels reserved in the retaining wall body, the drainage channels passing through the front of the retaining wall and arranged in the backfill concrete in front of the wall, and a water inlet reserved on the side wall of the wall near the retaining wall, the water inlet being connected to the drainage channel;

[0011] A concrete water-blocking layer is provided behind the retaining wall at the entrance of the drainage channel, and a plurality of longitudinal water grooves are provided in the concrete water-blocking layer. Drainage slopes are provided on both sides of the longitudinal water grooves to ensure that the longitudinal water grooves are located at the lowest point in the horizontal direction. The longitudinal water grooves correspond to the drainage channels one by one, and the longitudinal water grooves are connected to the drainage channels through transition water grooves provided in the concrete water-blocking layer;

[0012] Permeable sandless concrete slabs are laid between the upper surface of the concrete waterproof layer and the backfill soil, between the backfill soil and the retaining wall, and between the backfill soil and the excavation line of the slope behind the wall. Concrete sealing layers are provided on the top of the permeable sandless concrete slabs between the backfill soil and the retaining wall, and on the top of the permeable sandless concrete slabs between the backfill soil and the retaining wall, and between the backfill soil and the excavation line of the slope behind the wall.

[0013] Furthermore, the drainage channel is circular, and one drainage channel is reserved every 10m-15m on the retaining wall. The diameter of the drainage channel is 0.1m, and the drainage channel is set with a slope of 4%-5% from the back of the retaining wall to the front of the wall.

[0014] Furthermore, the concrete waterproof layer has a transverse width from the retaining wall to the excavation line of the slope behind the wall, a thickness of not less than 0.2m, and a longitudinal slope of 0.5%-1%.

[0015] Furthermore, two adjacent longitudinal water troughs are arranged at intervals of 10m-15m, the depth and width of the longitudinal water trough are not less than 0.1m, and the longitudinal slope is consistent with the concrete waterproof layer.

[0016] Furthermore, a drainage slope of 4%-5% is set on the left and right sides of the longitudinal water trough.

[0017] Furthermore, the angles between the transition water trough, the longitudinal water trough and the drainage channel are not less than 45 degrees, and the transition water trough is set with a slope of 4%-5% along the water flow direction.

[0018] Furthermore, a groove is provided near the top of the backfill concrete in front of the wall. The drainage channel is arranged in the groove and is opposite to the water inlet on the side wall of the drainage ditch in front of the wall. This ensures that the accumulated water in the drainage channel flows into the drainage ditch in front of the wall. At the same time, the water flow surface of the drainage channel is located below the top surface of the backfill concrete in front of the wall and the drainage ditch in front of the wall, preventing mud from contaminating the wall surface.

[0019] Furthermore, the intersection angle between the drainage ditch in front of the wall and the drainage channel is 90 degrees.

[0020] Furthermore, the height of the concrete sealing layer is not less than 0.5m.

[0021] A construction method for a retaining wall drainage system, the process of which is as follows:

[0022] Step 1: Excavate the foundation pit for the retaining wall body, the front part of the wall, and the back part of the wall;

[0023] Step 2: Install the template and place the embedded pipes of the drainage channel inside the template;

[0024] Step 3: pour concrete and remove formwork;

[0025] Step 4: Backfill the concrete and the drainage ditch in front of the wall, reserve the groove, complete the construction of the drainage ditch in front of the wall, and seal the interface between the groove in front of the wall and the drainage channel;

[0026] Step 5: Construct the part below the concrete waterproof layer behind the wall;

[0027] Step 6: Construct the concrete waterproof layer behind the wall and complete the longitudinal slope construction on the top of the concrete waterproof layer. At the same time, the longitudinal water trough and transition water trough are completed by setting up formwork and pouring concrete, and the interfaces of the longitudinal water trough, drainage channel and transition water trough are sealed.

[0028] Step 7: Lay permeable sand-free concrete slab;

[0029] Step 8: Backfill soil and concrete sealing layer behind the construction wall to complete the construction of retaining wall and drainage system.

[0030] Compared with the prior art, the retaining wall drainage system of the present invention has the following advantages:

[0031] (1) This system is equipped with a longitudinal water trough behind the wall to effectively collect the accumulated water behind the wall and realize the functions of drainage and isolation; a drainage channel and a transition water trough are set up to smooth the drainage channel and greatly improve the drainage effect behind the wall; by setting up a transition water trough, the longitudinal water trough and the horizontal drainage channel are connected, preventing the phenomenon of water flow being blocked in the vertical bend water trough.

[0032] (2) This system increases the horizontal width of the waterproof layer at the bottom of the wall and sets a permeable sandless concrete drainage board on the top of the concrete waterproof layer behind the wall to increase the drainage area, effectively prevent siltation, and avoid the loss of soil particles behind the wall.

[0033] (3) This system does not use geotextiles and plastic drainage pipes, and there is no aging phenomenon, which avoids the resulting clogging and loss of soil particles behind the wall; a permeable sandless concrete slab is set between the backfill soil and the excavation line of the slope behind the wall, which effectively improves the drainage efficiency behind the wall.

[0034] (4) The water flow surface of the drainage channel in front of the wall of this system is lower than the top of the backfill layer in front of the wall and the top of the drainage ditch in front of the wall, preventing mud from contaminating the wall surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 It is a retaining wall drainage solution in the existing technology;

[0037] Figure 2 is a cross-sectional view of the retaining wall drainage system of the present invention;

[0038] Figure 3 It is a plan view of the retaining wall drainage system of the present invention.

[0039] Description of reference numerals:

[0040] 1. Retaining wall; 2. Drainage pipe; 3. Excavation line of the slope behind the wall; 4. Backfill soil; 5. First aquiclude; 6. Permeable layer; 7. Second aquiclude; 8. Backfill layer in front of the wall; 9. Drainage ditch in front of the wall; 10. Concrete aquiclude; 11. Concrete sealing layer; 12. Drainage channel; 13. Longitudinal water trough; 14. Transition water trough; 15. Backfill concrete in front of the wall; 16. Permeable sandless concrete slab. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] like Figure 2 and 3 As shown, a retaining wall drainage system includes a circular drainage channel 12 reserved every 10-15m on the retaining wall 1. The diameter of the drainage channel 12 is 0.1m, and a slope of 4%-5% is set from the back of the retaining wall to the front of the wall. The drainage channel 12 is set in the front of the wall in the backfill concrete 15. The front of the wall drainage ditch 9 is near the side wall of the retaining wall 1 and has a water inlet. The water inlet is connected to the drainage channel 12, and the intersection angle between the drainage channel 12 and the front of the wall drainage ditch 9 is 90 degrees. A groove is provided near the top of the front of the wall backfill concrete 15. The drainage channel 12 is set in the groove and is arranged opposite to the water inlet on the side wall of the front of the wall drainage ditch 9. It is ensured that the accumulated water in the drainage channel 12 enters the front of the wall drainage ditch 9. At the same time, the water flow surface of the drainage channel 12 is located below the top of the front of the wall backfill concrete 15 and the top surface of the front of the wall drainage ditch 9 to prevent mud from contaminating the wall surface.

[0046] A concrete aquiclude 10 is provided behind the retaining wall 1 at the entrance to the drainage channel 12. This concrete aquiclude 10 extends from the retaining wall 1 to the rear slope excavation line 3, has a thickness of no less than 0.2m, and a longitudinal slope of 0.5%-1%, effectively draining soil water. A longitudinal water channel 13 is provided longitudinally within the concrete aquiclude 10. This channel 13 has a depth and width of no less than 0.1m and a longitudinal slope consistent with that of the concrete aquiclude 10. A drainage slope of 4%-5% is set on both sides of the longitudinal water channel 13 to ensure that the longitudinal water channel 13 is located at the lowest point in the transverse direction.

[0047] The longitudinal water trough 13 is connected to the drainage channel 12 every 10-15m through a transition water trough 14 set in the concrete waterproof layer 10. The angle between the transition water trough 14 and the longitudinal water trough 13 and the drainage channel 12 is not less than 45 degrees. The transition water trough 14 is set with a slope of 4%-5% along the direction of water flow.

[0048] Permeable sandless concrete slabs 16 are laid between the upper surface of the concrete waterproof layer 10 and the backfill 4, between the backfill 4 and the retaining wall 1, and between the backfill 4 and the wall back slope excavation line 3. This increases the permeable area, shortens the drainage path, protects the soil from loss, and effectively drains the accumulated water. The permeable sandless concrete slabs 16 are sandless concrete slabs in the prior art and have a water-permeable function. A concrete sealing layer 11 is provided on the top of the permeable sandless concrete slab 16 between the backfill 4 and the retaining wall 1, and between the backfill 4 and the wall back slope excavation line 3. The height of the concrete sealing layer 11 is not less than 0.5m to prevent surface water from directly flowing into the soil layer behind the wall.

[0049] In the existing drainage scheme, the drainage pipes 2 are generally arranged at intervals of 2m up and down and left and right. When the accumulated water reaches the water inlet of the drainage pipe 2, it can be drained, but the accumulated water between the two drainage pipes on the horizontal plane cannot be discharged smoothly, and mainly accumulates in the permeable layer 6, and finally seeps back into the backfill soil 4, which reduces the effect of the retaining wall drainage system. The present invention collects the accumulated water behind the wall in the longitudinal water tank 13 by setting a longitudinal water tank 13, which can realize the functions of collecting accumulated water and draining water. The accumulated water that seeps out of the soil layer will no longer return to the soil layer, thereby achieving an isolation effect. Compared with the point drainage of the existing drainage scheme, the present invention can be understood as adopting a linear drainage scheme, and the drainage effect is greatly improved.

[0050] In the existing drainage scheme, a permeable layer 6 is set behind the wall to drain the accumulated water on the contact surface. However, the contact surface is too small to drain the water effectively. The only way is to drain the accumulated water in the soil layer on the contact surface, reduce the moisture content of the soil layer on the contact surface, and then gradually cause the accumulated water in the surrounding soil to penetrate into the contact surface. The drainage path is longer. The present invention sets permeable sandless concrete slabs 16 in three directions of the backfill soil 4, which greatly increases the drainage and permeable area and shortens the drainage path.

[0051] In the existing drainage scheme, a waterproof layer 5 is set behind the wall, which is generally about 0.5m wide in the horizontal direction. Within this smaller width range, it is difficult to make the water level reach the height of the water inlet of the drain pipe 2 to achieve drainage. Water can easily penetrate into the surrounding soil. Only when there is a lot of water accumulated in the soil layer and the surrounding soil is saturated can a higher water level be formed on the waterproof layer 5. Therefore, the drainage effect is not ideal; the present invention provides a wider concrete waterproof layer 10, and a longitudinal water trough 13 is provided in the concrete waterproof layer 10, so that the accumulated water can smoothly leave the soil layer.

[0052] In the existing drainage scheme, the drainage pipe 2 is wrapped with a permeable geotextile to prevent the loss of soil particles and permeable layer particles. The diameter of the drainage pipe 2 is generally 10 cm, and the permeable area is small. The geotextile is easily blocked by fine-grained soil, resulting in the drainage pipe being unable to drain water and the retaining wall drainage system failing. The present invention does not use geotextile, and there is no problem of being blocked by fine-grained soil.

[0053] In the existing drainage scheme, the geotextile is easily weathered and loses its function of preventing the outflow of soil particles and permeable layer particles after being damaged. The outflow of soil particles and permeable layer particles behind the wall affects the stability of the soil behind the wall and is also easy to block the drainage pipe 2; in the existing drainage scheme, the drainage pipe 2 generally adopts plastic PVC pipes, and the pipes and geotextile are easy to age and damage, causing the drainage pipe 2 to be blocked; the present invention does not use PVC pipes and geotextiles, and there is no aging, damage or blockage.

[0054] In the existing drainage scheme, when the accumulated water behind the wall flows out through the drainage pipe 2, it is mixed with mud and leaves traces of mud and water on the wall, especially the drainage pipe at a high position, which affects the appearance of the wall. The present invention does not set up a drainage pipe at a high position, so there is no situation where mud and water pollute the wall surface. The present invention sets up a drainage channel 12, the top of which is flush with the top of the backfill layer in front of the wall and the drainage ditch, and the water flow surface is 0.1m lower than the top of the backfill layer in front of the wall and the drainage ditch, so there is no situation where mud and water pollute the wall surface.

[0055] A construction method for a retaining wall drainage system, the process of which is as follows:

[0056] Step 1: excavate the foundation pit of the retaining wall 1 main body, the front part of the wall, and the back part of the wall;

[0057] In the second step, the formwork is installed, and the embedded pipes of the drainage channel 12 are placed in the formwork, with a distance of 10m-15m and located at the bottom layer, which has little impact on the construction. In the existing solution, a drainage pipe is set up at an interval of 2m above, below, left and right. When installing the formwork, the reserved drainage pipes need to be tied. When pouring concrete, it is necessary to avoid impact on the drainage pipes. When vibrating the concrete, the presence of these drainage pipes will also affect the vibration effect. The drainage pipes have to be longer than the thickness of the retaining wall. After pouring the concrete, a longer drainage pipe needs to be used to replace the drainage pipes reserved when pouring the formwork, which is a complicated process.

[0058] Step 3: pour concrete and remove formwork;

[0059] Step 4: Backfill the concrete 15 and the drainage ditch 9 in front of the wall, reserve the groove, complete the drainage ditch construction of the drainage channel 12 in the front part of the wall, and seal the interface between the groove in front of the wall and the drainage channel 12;

[0060] Step 5: construct the concrete waterproof layer below 10 behind the wall;

[0061] Step 6: Construct the concrete waterproof layer 10 behind the wall and make the top slope. At the same time, the longitudinal water trough 13 and the transition water trough 14 are made by setting up the formwork and pouring concrete. The interfaces of the longitudinal water trough 13, the drainage channel 12 and the transition water trough 14 are sealed.

[0062] Step 7: Laying the permeable sandless concrete slab 16. This process is relatively convenient to construct. The permeable sandless concrete slab 16 can be directly laid on the plane. However, the existing scheme is more complicated to construct the filter layer. First, it is necessary to adjust the gradation content of coarse particles and fine particles in the filter layer. During construction, backfill soil is first constructed, and then the construction space of the filter layer is excavated to complete the construction of the filter layer. This construction is more complicated than the construction of the sandless concrete slab in the present invention.

[0063] Step 8: Backfill soil 4 and concrete sealing layer 11 behind the construction wall to complete the construction of the retaining wall and drainage system.

[0064] During the operation stage, since the present invention can greatly improve the drainage effect, the accumulated water behind the wall can be drained in time, effectively reducing the water and soil pressure behind the wall, which plays a positive role in the stability of the retaining wall during operation; at the same time, there is no need to consider the aging problem of plastic drainage pipes and geotextiles, which reduces the operation and maintenance costs; there is no mud pollution wall, the retaining wall is more beautiful and more in line with environmental protection requirements.

[0065] During the design phase, the water and soil pressure behind the wall, especially the stress on the retaining wall under water immersion, is further analyzed in combination with the drainage effect of the retaining wall of the present invention, so that the retaining wall cross section can be optimized during the design of the retaining wall structure.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A retaining wall drainage system, characterized by: It includes a plurality of drainage channels reserved in the retaining wall, the drainage channels pass through the front of the retaining wall and are arranged in the backfill concrete in front of the wall, and the drainage ditch in front of the wall is reserved with a water inlet on the side wall near the retaining wall, and the water inlet is connected to the drainage channel; A concrete water-blocking layer is provided behind the retaining wall at the entrance of the drainage channel, and a plurality of longitudinal water grooves are provided in the concrete water-blocking layer. Drainage slopes are provided on both sides of the longitudinal water grooves. The longitudinal water grooves correspond to the drainage channels one by one, and the longitudinal water grooves are connected to the drainage channels through transition water grooves provided in the concrete water-blocking layer; A permeable sandless concrete slab is laid between the upper surface of the concrete waterproof layer and the backfill soil, between the backfill soil and the retaining wall, and between the backfill soil and the excavation line of the slope behind the wall. A concrete sealing layer is provided on the top of the permeable sandless concrete slab between the backfill soil and the retaining wall, and on the top of the permeable sandless concrete slab between the backfill soil and the retaining wall, and on the top of the permeable sandless concrete slab between the backfill soil and the excavation line of the slope behind the wall; The drainage channel is circular, and one drainage channel is reserved every 10m-15m on the retaining wall. The diameter of the drainage channel is 0.1m, and the drainage channel is set with a slope of 4%-5% from the back of the retaining wall to the front of the wall; A groove is provided near the top of the backfill concrete in front of the wall. The drainage channel is provided in the groove and is arranged opposite to the water inlet on the side wall of the drainage ditch in front of the wall.

2. A retaining wall drainage system according to claim 1, characterized in that: The concrete waterproof layer has a transverse width from the retaining wall to the excavation line of the slope behind the wall, a thickness of not less than 0.2m, and a longitudinal slope of 0.5%-1%.

3. A retaining wall drainage system according to claim 2, characterized in that: The interval between two adjacent longitudinal water troughs is 10m-15m, the depth and width of the longitudinal water trough are not less than 0.1m, and the longitudinal slope is consistent with the concrete waterproof layer.

4. A retaining wall drainage system according to claim 1, characterized in that: The angles between the transition water trough, the longitudinal water trough and the drainage channel are not less than 45 degrees, and the transition water trough is set with a slope of 4%-5% along the direction of water flow.

5. The retaining wall drainage system according to claim 1, characterized in that: The intersection angle between the drainage ditch in front of the wall and the drainage channel is 90 degrees.

6. The retaining wall drainage system according to claim 1, characterized in that: The height of the concrete sealing layer is not less than 0.5m.

7. The retaining wall drainage system according to claim 1, characterized in that: A drainage slope of 4%-5% is set on the left and right sides of the longitudinal water trough.

8. A construction method for a retaining wall drainage system, characterized in that: The process is as follows: Step 1: Excavate the foundation pit for the retaining wall body, the front part of the wall, and the back part of the wall; Step 2: Install the template and place the embedded pipes of the drainage channel inside the template; Step 3: pour concrete and remove formwork; Step 4: Backfill the concrete and the drainage ditch in front of the wall, reserve the groove, complete the construction of the drainage ditch in front of the wall, and seal the interface between the groove in front of the wall and the drainage channel; Step 5: Construct the part below the concrete waterproof layer behind the wall; Step 6: Construct the concrete waterproof layer behind the wall and complete the longitudinal slope construction on the top of the concrete waterproof layer. At the same time, the longitudinal water trough and transition water trough are completed by setting up formwork and pouring concrete, and the interfaces of the longitudinal water trough, drainage channel and transition water trough are sealed. Step 7: Lay permeable sand-free concrete slab; Step 8: Backfill soil and concrete sealing layer behind the construction wall to complete the construction of retaining wall and drainage system.

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