A backwater drainage system and construction method for precast retaining walls

Abstract

This invention relates to the field of precast retaining wall technology, and more particularly to a back drainage system and construction method for integral precast retaining walls. The invention involves collecting the slope gradient and soil density of the slope; determining whether the slope quality meets standards based on the slope gradient; if the quality does not meet standards, adjusting the number of openings in the PVC pipes or adjusting the diameter of each opening according to the soil density; connecting the precast retaining walls using their concave and convex sides; sequentially lifting and assembling several precast retaining walls into a precast retaining wall cabinet, and backfilling the gaps between the precast retaining walls with fine aggregate concrete; laying geotextile at the junction of each precast retaining wall joint and the slope; and wrapping the adjusted PVC pipe openings with geotextile and backfilling sequentially to form a back drainage system for the integral precast retaining wall, thus improving the construction efficiency of the back drainage system for integral precast retaining walls.

Description

Technical Field

[0001] This invention relates to the field of precast retaining wall technology, and in particular to a back drainage system and construction method for integral precast retaining walls. Background Technology

[0002] The back drainage system of the precast retaining wall integrates drainage pipes inside the retaining wall, effectively utilizing the space of the retaining wall. Compared with the traditional underground drainage system, it can save ground space and make land use more efficient. The back drainage system sets the drainage pipes inside the retaining wall, so that seepage water can be discharged quickly and effectively. However, how to solve the problem of low resistance to slope compressive stress and the low construction efficiency of the back drainage system are urgent problems to be solved.

[0003] Existing patent number: CN 112343067 B, this prior art discloses a precast block hollow box-filled ecological retaining wall and its construction method, including a precast retaining wall box, a crushed stone backfill layer, a slope, a concrete cushion layer, a crushed stone cushion layer, anti-slide piles, a water collection trough, and a foundation; excavation steps are formed on the slope, anti-slide piles are driven at the bottom of the slope, a crushed stone cushion layer and a concrete cushion layer are sequentially set on the top of the anti-slide piles, a foundation is set on the top of the concrete cushion layer, a water collection trough is set in the foundation, and a precast retaining wall box is set on the top of the foundation; a crushed stone backfill layer is laid on the back of the precast retaining wall box, and anti-slide piles are set at the bottom of the retaining wall to improve the overall stability of the retaining wall; however, it does not address how to increase resistance to slope compressive stress and the low construction efficiency of the back drainage system. Summary of the Invention

[0004] Therefore, the present invention provides a back drainage system and construction method for integral precast retaining walls to overcome the problems of low compressive stress in precast retaining walls and low construction efficiency of back drainage systems in the prior art.

[0005] To achieve the above objectives, the present invention provides a construction method for a backwater drainage system for an integral precast retaining wall, comprising:

[0006] The slope gradient and soil density of the slope were collected separately.

[0007] The quality of the slope is determined based on its slope gradient to determine whether it meets the standards.

[0008] If the quality of the slope is determined to be non-compliant with the standard, the number of openings in the PVC pipe should be adjusted or the diameter of each opening in the PVC pipe should be adjusted according to the soil density of the slope.

[0009] Connect the concave and convex sides of each precast retaining wall;

[0010] Several prefabricated retaining walls are lifted and assembled into a prefabricated retaining wall cabinet in sequence, and fine stone concrete is backfilled into the gaps between the prefabricated retaining walls.

[0011] Geotextile is laid at the junction of the precast retaining wall and the slope, and clay and fine sand are backfilled at the junction of the precast retaining wall and the slope to form a first clay and fine sand layer. Crushed stone is backfilled on top of the first clay and fine sand layer to form a second crushed stone layer.

[0012] The standard diameter openings of the number of PVC pipes or the standard number of openings of the PVC pipes of the specified diameter are wrapped with geotextile. Fine sand is then backfilled on top of the second gravel layer to form a third fine sand layer. Clay is then backfilled on top of the third fine sand layer to form a fourth clay layer, thus forming the back drainage system of the integral precast retaining wall.

[0013] Furthermore, determining whether the quality of the slope meets the standards based on the slope gradient includes:

[0014] The slope of the slope is compared with the preset first slope and the preset second slope, respectively;

[0015] If the slope of the slope is greater than the preset first slope and less than or equal to the preset second slope, then the construction of the back drainage system is determined twice based on the soil density of the slope to determine whether it meets the standard.

[0016] If the slope of the slope is greater than the preset second slope, the reason why the quality of the slope does not meet the standard is determined based on the slope of the slope.

[0017] Furthermore, a secondary determination of whether the slope quality meets the standards is made based on the soil density of the slope, including:

[0018] The soil density of the slope is compared with the preset soil density;

[0019] If the soil density of the slope is less than or equal to the preset soil density, the reason why the quality of the slope does not meet the standard is determined based on the difference between the preset soil density and the soil density of the slope.

[0020] Furthermore, the reasons why the slope's quality does not meet the standard are determined based on the difference between the preset soil density and the slope's soil density, including:

[0021] The difference between the preset soil density and the soil density of the slope is compared with the preset soil density difference.

[0022] If the difference in soil density of the slope is greater than the preset soil density difference, adjust the diameter of each opening point of the PVC pipe.

[0023] Furthermore, the reasons for the slope's quality failing to meet standards are determined based on the slope gradient, including:

[0024] The slope of the slope is compared with the preset first slope.

[0025] If the slope difference is greater than the preset slope difference, adjust the number of openings in the PVC pipe.

[0026] Furthermore, the aperture of each opening point of the PVC pipe is adjusted according to the difference between the preset soil density and the soil density of the slope.

[0027] Furthermore, the number of openings in the PVC pipe is adjusted according to the difference between the slope and the preset first slope.

[0028] Furthermore, the back drainage system constructed using the construction method described above for the back drainage system of the integral precast retaining wall includes,

[0029] A prefabricated retaining wall unit is used to resist the compressive stress of a slope, and includes a prefabricated retaining wall cabinet composed of several prefabricated retaining walls.

[0030] The rear drainage unit is located on the soil-facing side of the precast retaining wall cabinet to drain the seepage water from the second crushed stone layer to reduce the back water pressure of the integral precast retaining wall. It includes a PVC pipe for draining the seepage water, wherein the PVC pipe is provided with several openings.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention collects the slope gradient and soil density of the slope; determines whether the quality of the slope meets the standard based on the slope gradient; if the quality does not meet the standard, the number of openings of the PVC pipe is adjusted or the diameter of each opening of the PVC pipe is adjusted according to the soil density of the slope; the precast retaining walls are connected using the concave and convex sides of the precast retaining walls; several precast retaining walls are sequentially lifted and assembled into a precast retaining wall cabinet, and the gaps between the precast retaining walls are backfilled with a layer of fine stone concrete; geotextile is laid at the junction of each precast retaining wall joint and the slope; the adjusted openings of the PVC pipe are wrapped with geotextile and backfilled sequentially to form a third fine sand layer and a fourth clay layer to form a back drainage system for the integral precast retaining wall, thereby improving the construction efficiency of the back drainage system for the integral precast retaining wall.

[0032] Furthermore, the present invention improves the resistance to compressive stress on the slope by using mortise and tenon joints and filling the gaps between the joints with fine stone concrete, while reducing the occurrence of slope cracks. Moreover, the mortise and tenon design is also beneficial to the prefabricated retaining wall cabinet to function effectively under different slope terrains based on the changes in slope terrain collected by the acquisition unit, thereby further improving the construction efficiency of the back drainage system.

[0033] Furthermore, the tilt sensor and open-air density sensor of this invention, combined with data acquisition equipment and software, can collect, store and analyze slope and soil density data of the slope in real time, which improves the accuracy of the back drainage system, saves time and increases convenience.

[0034] Furthermore, the slope of the slope can be used to quickly determine whether the quality of the slope meets the standards, thus improving the construction efficiency of the back drainage system.

[0035] Furthermore, the soil density of the slope can be used to accurately determine whether the quality of the slope meets the standards, thus improving the accuracy of the construction of the back drainage system.

[0036] Furthermore, by adjusting the orifice diameter of each opening in the PVC pipe, the drainage of seepage water can be controlled. Smaller orifice diameters can limit the flow rate, allowing seepage water to be discharged at an appropriate speed, while larger orifice diameters can increase drainage capacity, making it suitable for high-flow-rate seepage water drainage needs.

[0037] Furthermore, by adjusting the number of openings in the PVC pipe, the system can be flexibly adjusted according to specific application requirements and changing conditions. Under different usage conditions, the number of openings can be increased or decreased to adapt to different infiltration drainage standards. Attached Figure Description

[0038] Figure 1 This is a structural diagram of the rear drainage system of the integral prefabricated retaining wall according to an embodiment of the present invention;

[0039] Figure 2 This is a plan view of the integral prefabricated retaining wall according to an embodiment of the present invention;

[0040] Figure 3 This is a flowchart illustrating the construction steps of the back drainage system for the integral prefabricated retaining wall according to an embodiment of the present invention.

[0041] Figure 4 This is a plan view of a single prefabricated retaining wall according to an embodiment of the present invention;

[0042] Explanation of reference numerals in the attached drawings: First clay and fine sand layer - 001, Second crushed stone layer - 002, Third fine sand layer - 003, Fourth clay layer - 004, Geotextile - 005, Precast retaining wall cabinet - 006, Opening point - 007, Precast retaining wall - 008, Fine stone concrete layer - 009, Concave side of precast retaining wall - 010, Convex side of precast retaining wall - 011. Detailed Implementation

[0043] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0044] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0045] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Please see Figure 1 and Figure 2 and Figure 3 The figures shown are, respectively, a structural diagram of the back drainage system of the integral precast retaining wall according to an embodiment of the present invention, a plan view of the integral precast retaining wall according to an embodiment of the present invention, and a flowchart of the construction steps of the back drainage system of the integral precast retaining wall according to an embodiment of the present invention; the construction method of the back drainage system for the integral precast retaining wall according to the present invention includes,

[0047] Step S1: Collect the slope gradient and soil density of the slope, respectively;

[0048] Step S2: Determine whether the quality of the slope meets the standard based on the slope gradient;

[0049] Step S3: If it is determined that the quality of the slope does not meet the standard, adjust the number of openings 007 of the PVC pipe or adjust the diameter of each opening of the PVC pipe according to the soil density of the slope.

[0050] Step S4: Connect the concave side 010 and convex side 011 of each precast retaining wall.

[0051] Step S5: The prefabricated retaining walls are lifted and assembled into a prefabricated retaining wall cabinet 006 in sequence, and fine stone concrete 009 is backfilled into the gaps between the prefabricated retaining walls 008.

[0052] Step S6: Lay geotextile 005 at the junction of the precast retaining wall cabinet and the slope, backfill clay and fine sand at the junction of the precast retaining wall cabinet and the slope to form a first clay and fine sand layer 001, and backfill crushed stone above the first clay and fine sand layer to form a second crushed stone layer 002.

[0053] Step S7: Wrap the standard diameter openings of the number of PVC pipes or the standard number of openings 007 of the PVC pipes of the specified diameter with geotextile, and backfill fine sand above the second gravel layer to form a third fine sand layer 003, and backfill clay above the third fine sand layer to form a fourth clay layer 004 to form the back drainage system of the integral precast retaining wall.

[0054] Specifically, in this embodiment, the rear drainage unit further includes a first clay-fine sand layer 001 and a second crushed stone layer 002, with the slope being the ratio between the upward height of the slope at the installation position of the integral prefabricated retaining wall and the horizontal distance.

[0055] Slope (percentage) = (height ascent / horizontal distance) × 100%

[0056] In one embodiment, when the horizontal distance is 10 meters when the height is increased by 3 meters, the slope of the location is (3 / 10) × 100% = 30%. The slope is used to express the inclination of a slope and is often used to mark the steepness of the slope of hills, roofs and roads. This value is often expressed as a percentage or per mille of the tangent function of a trigonometric function, that is, "the height of ascent divided by the distance moved on the horizontal plane".

[0057] In the embodiment, the greater the slope, the greater the stress on the soil, the greater the required back pressure stress of the precast retaining wall, and the higher the drainage standard of the back drainage system.

[0058] When the back drainage system used for integral precast retaining walls is constructed and operated, the back drainage system includes precast retaining wall units and back drainage units. The precast retaining wall units, used to resist the compressive stress of the slope, include a precast retaining wall cabinet composed of several precast retaining walls. The back drainage units, used to drain water and reduce water pressure, are located on the soil-facing side of the precast retaining wall cabinets and include PVC pipes with several openings for draining seepage water. The slope gradient and soil density of the slope are collected. The number of openings in the PVC pipes is adjusted according to the slope gradient collected by the collection unit, thereby improving the back drainage system's performance. The drainage system improves the efficiency of infiltration water drainage and enhances the construction efficiency of the back drainage system. Furthermore, by adjusting the aperture of each opening point of the PVC pipe according to the collected soil density, the occurrence of low infiltration water drainage efficiency caused by the aperture of the PVC pipe opening point is reduced. The adjusted PVC pipe opening points are then wrapped with geotextile and backfilled with the third fine sand layer and the fourth clay layer in sequence to complete the back drainage system of the integral precast retaining wall. This reduces the occurrence of discrepancies between the construction of the back drainage system and the standards, thereby further improving the construction efficiency of the back drainage system.

[0059] Specifically, determining whether the quality of the slope meets the standards based on the slope gradient includes:

[0060] The slope of the slope is compared with the preset first slope and the preset second slope, respectively;

[0061] If the slope of the slope is greater than the preset first slope and less than or equal to the preset second slope, then the quality of the slope is determined based on the soil density of the slope to determine whether it meets the standard.

[0062] If the slope of the slope is greater than the preset second slope, the reason why the quality of the slope does not meet the standard is determined based on the slope of the slope.

[0063] Specifically, in this embodiment, the process by which the adjustment unit determines whether the quality of the slope meets the standard based on the slope gradient includes:

[0064] If the slope is less than or equal to the preset first slope, the adjustment unit determines that the quality of the slope meets the standard and continues construction.

[0065] If the slope is greater than the preset first slope and less than or equal to the preset second slope, the quality of the slope is initially determined to be non-compliant. The quality of the slope is then determined a second time based on the soil density of the slope.

[0066] If the slope is greater than the preset second slope, the quality of the slope is determined to be non-compliant with the standard, and the reason for the non-compliance of the slope quality is determined based on the slope.

[0067] In one embodiment, the preset first slope is 30% and the preset second slope is 45%. The slope of the slope can quickly determine whether the quality of the slope meets the standard, thus improving the construction efficiency of the back drainage system.

[0068] Specifically, the quality of the slope is determined a second time based on the soil density of the slope to determine whether it meets the standards, including:

[0069] The soil density of the slope is compared with the preset soil density;

[0070] If the soil density of the slope is less than or equal to the preset soil density, the reason why the quality of the slope does not meet the standard is determined based on the soil density.

[0071] Specifically, in the embodiments, the process of determining the quality of the slope based on the soil density of the slope includes,

[0072] If the soil density of the slope is less than or equal to the preset soil density, the quality of the slope is determined to be non-compliant for the second time. The reason for the non-compliance of the slope quality is determined based on the difference between the preset soil density and the soil density of the slope.

[0073] If the soil density of the slope is greater than the preset soil density, the quality of the slope is judged to meet the standard a second time, and construction continues.

[0074] Specifically, in one embodiment, the preset soil density is 1.4 g / cm³, which uses saturated density, meaning that in this embodiment, the density refers to the soil density in a fully saturated state, including the case where all pores in the soil are filled with water. By using the soil density of the slope, the quality of the slope can be accurately determined a second time to see if it meets the standards, reducing the occurrence of misjudgments and improving the accuracy of the construction of the back drainage system.

[0075] Specifically, determining the reasons why the slope quality does not meet the standard based on the difference between the preset soil density and the soil density includes:

[0076] The difference between the preset soil density and the soil density of the slope is compared with the preset soil density difference.

[0077] If the difference in soil density of the slope is greater than the preset soil density difference, adjust the diameter of each opening point of the PVC pipe.

[0078] Specifically, in the embodiments, the process of determining the reason why the slope quality does not meet the standard based on the difference between the preset soil density and the soil density includes,

[0079] If the difference in soil density is less than or equal to the preset difference in soil density, the reason why the slope quality does not meet the standard is determined to be a misjudgment caused by air humidity, and construction continues;

[0080] If the difference in soil density is greater than the preset difference in soil density, the reason why the quality of the slope does not meet the standard is determined to be the problem of the hole diameter at each opening point. Adjust the hole diameter at each opening point of the PVC pipe.

[0081] In one embodiment, the preset soil density difference value is 0.1; the aperture of each opening point in the PVC pipe is the diameter of each opening point in the PVC pipe.

[0082] Specifically, determining the reasons why the slope quality does not meet the standards based on the slope gradient includes:

[0083] The slope of the slope is compared with the preset first slope.

[0084] If the slope difference is greater than the preset slope difference, adjust the number of openings in the PVC pipe.

[0085] Specifically, in the embodiments, the process of determining the reason why the quality of the slope does not meet the standard based on the difference between the slope gradient and the preset first inclination includes,

[0086] Construction continues when the difference in slope is less than or equal to the preset slope difference.

[0087] When the difference in slope is greater than the preset slope difference, the reason why the quality of the slope does not meet the standard is determined to be the number of openings in the PVC pipe. Adjust the number of openings in the PVC pipe.

[0088] In one embodiment, the preset slope difference is 5%, and the number of openings in the PVC pipe is the number of openings in the PVC pipe. In this embodiment, the number of openings is 6 to 8 per meter.

[0089] Specifically, the aperture of each opening point of the PVC pipe is adjusted according to the difference between the preset soil density and the soil density of the slope.

[0090] Specifically, in this embodiment, the process of adjusting the aperture of each opening point of the PVC pipe based on the difference between the preset soil density and the soil density includes:

[0091] If the difference in soil density is less than or equal to the preset difference in soil density, adjust the diameter of each opening in the PVC pipe from 6 mm to 8 mm.

[0092] If the difference in soil density is greater than the preset difference in soil density, adjust the diameter of each opening in the PVC pipe to 12 mm.

[0093] Specifically, by adjusting the orifice diameter of each opening in the PVC pipe, the drainage of seepage water can be controlled. Smaller orifice diameters can limit the flow rate, allowing seepage water to be discharged at an appropriate speed, while larger orifice diameters can increase the drainage capacity, making it suitable for high-flow-rate seepage water drainage needs.

[0094] Specifically, the number of openings in the PVC pipe is adjusted according to the difference between the slope and the preset first slope.

[0095] Specifically, in this embodiment, the process of adjusting the number of openings in the PVC pipe based on the difference between the slope of the slope and the preset first slope includes,

[0096] If the difference in slope gradient is less than or equal to the preset slope gradient difference, adjust the number of openings in the PVC pipe from 6 per meter to 7 per meter.

[0097] If the difference in slope gradient is greater than the preset slope gradient difference, adjust the number of openings in the PVC pipe to 8 per meter.

[0098] Specifically, by adjusting the number of openings in the PVC pipe, the system can be flexibly adjusted according to specific application requirements and changing conditions. Under different usage conditions, the number of openings can be increased or decreased to adapt to different infiltration drainage standards.

[0099] The back drainage system of the integral precast retaining wall of the present invention includes a precast retaining wall unit and a back drainage unit, wherein,

[0100] Precast retaining wall unit, used to resist the compressive stress of the slope, includes a precast retaining wall cabinet 006 composed of several precast retaining walls;

[0101] The rear drainage unit is located on the soil-facing side of the precast retaining wall cabinet to drain the seepage water from the second crushed stone layer 002 to reduce the back water pressure of the integral precast retaining wall. It includes a PVC pipe for draining the seepage water, wherein the PVC pipe is provided with a number of openings 007.

[0102] Please continue reading. Figure 4 As shown, it is a plan view of a single prefabricated retaining wall in an embodiment of the present invention; the prefabricated retaining wall unit in the embodiment of the present invention also includes each prefabricated retaining wall having a concave side and a convex side.

[0103] Specifically, the prefabricated retaining walls of the prefabricated retaining wall cabinet are connected by mortise and tenon joints, and the gaps between the joints are filled with fine stone concrete.

[0104] Specifically, in the embodiment, the prefabricated retaining wall unit further includes each prefabricated retaining wall of the prefabricated retaining wall cabinet 006 having a prefabricated retaining wall concave side 010 and a prefabricated retaining wall convex side 011, and each prefabricated retaining wall is connected by a mortise and tenon joint and the gap between the joints is filled with fine stone concrete.

[0105] Specifically, in the embodiment, the prefabricated retaining wall cabinet includes 2 to 4 pre-set retaining walls, which are connected by mortise and tenon joints and the gaps between the joints are filled with fine stone concrete. This improves the resistance to the compressive stress of the slope and reduces the occurrence of cracks in the slope. Moreover, the mortise and tenon design is also beneficial to the changes in slope topography collected by the acquisition unit, so that the prefabricated retaining wall cabinet can play an effective role under different slope topography, thereby further improving the construction efficiency of the back drainage system.

[0106] Specifically, it also includes,

[0107] Inclination sensors are installed on the surface of the slope to collect the slope gradient.

[0108] A density sensor is installed on the soil surface of the slope to collect the soil density of the slope;

[0109] Specifically, in this embodiment, the tilt sensor is a sensor that measures the tilt angle of the ground. In this embodiment, accelerometer or gyroscope technology is used to measure the tilt angle and output the data to the adjustment unit.

[0110] The density sensor uses vibration or acoustic wave technology to display the soil density by measuring the acoustic impedance or echo time of the soil, and transmits the soil density data, including dry density and saturated density, preferably the saturated density, to the adjustment unit for real-time display and recording of density data.

[0111] Specifically, the tilt sensor and density sensor, combined with data acquisition equipment and software, can collect, store and analyze slope and soil density data in real time, improving the accuracy of the back drainage system, saving time and increasing convenience.

[0112] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A construction method for a back drainage system for an integral precast retaining wall, characterized in that, include: The slope gradient and soil density of the slope were collected separately. The quality of the slope is determined based on its slope gradient to determine whether it meets the standards. The determination of whether the quality of the slope meets the standard based on the slope gradient includes: The slope of the slope is compared with the preset first slope and the preset second slope, respectively; If the slope of the slope is greater than the preset first slope and less than or equal to the preset second slope, then the quality of the slope is determined a second time based on the soil density of the slope to determine whether the slope meets the standard. If the slope of the slope is greater than the preset second slope, the reason why the quality of the slope does not meet the standard is determined based on the slope of the slope. The quality of the slope is determined a second time based on the soil density of the slope, including: The soil density of the slope is compared with the preset soil density; If the soil density of the slope is less than or equal to the preset soil density, the reason why the quality of the slope does not meet the standard is determined based on the difference between the preset soil density and the soil density of the slope. The reasons why the slope quality does not meet the standard are determined based on the difference between the preset soil density and the soil density of the slope, including: The difference between the preset soil density and the soil density of the slope is compared with the preset soil density difference. If the difference in soil density of the slope is greater than the preset soil density difference, adjust the diameter of each opening point of the PVC pipe. If the quality of the slope is determined to be non-compliant with the standard, the number of openings in the PVC pipe should be adjusted or the diameter of each opening in the PVC pipe should be adjusted according to the soil density of the slope. Connect the concave and convex sides of each precast retaining wall; Several prefabricated retaining walls are lifted and assembled into a prefabricated retaining wall cabinet in sequence, and fine stone concrete is backfilled into the gaps between the prefabricated retaining walls. Geotextile is laid at the junction of the precast retaining wall and the slope, and clay and fine sand are backfilled at the junction of the precast retaining wall and the slope to form a first clay and fine sand layer. Crushed stone is backfilled on top of the first clay and fine sand layer to form a second crushed stone layer. The standard diameter openings of the number of PVC pipes or the standard number of openings of the PVC pipes of the specified diameter are wrapped with geotextile. Fine sand is then backfilled on top of the second gravel layer to form a third fine sand layer. Clay is then backfilled on top of the third fine sand layer to form a fourth clay layer, thus forming the back drainage system of the integral precast retaining wall.

2. The construction method for the back drainage system of an integral precast retaining wall according to claim 1, characterized in that, The reasons for the slope's quality not meeting the standards are determined based on the slope gradient, including: The slope of the slope is compared with the preset first slope. If the slope difference is greater than the preset slope difference, adjust the number of openings in the PVC pipe.

3. The construction method for the back drainage system of an integral precast retaining wall according to claim 2, characterized in that, Adjust the aperture of each opening point of the PVC pipe according to the difference between the preset soil density and the soil density of the slope.

4. The construction method for the back drainage system of an integral precast retaining wall according to claim 3, characterized in that, The number of openings in the PVC pipe is adjusted according to the difference between the slope and the preset first slope.

5. A backwater drainage system constructed using the backwater drainage system construction method for an integral precast retaining wall as described in any one of claims 1-4, characterized in that, include: A prefabricated retaining wall unit is used to resist the compressive stress of a slope, and includes a prefabricated retaining wall cabinet composed of several prefabricated retaining walls. The rear drainage unit is located on the soil-facing side of the precast retaining wall cabinet to drain the seepage water from the second crushed stone layer to reduce the back water pressure of the integral precast retaining wall. It includes a PVC pipe for draining the seepage water, wherein the PVC pipe is provided with several openings.

6. The back drainage system constructed according to the construction method of the back drainage system for an integral precast retaining wall as described in claim 5, is characterized in that, The precast retaining wall includes a concave side and a convex side.

7. The back drainage system constructed according to the construction method of the back drainage system for an integral precast retaining wall as described in claim 6, is characterized in that, The prefabricated retaining walls of the prefabricated retaining wall cabinet are connected by mortise and tenon joints, and the gaps between the joints are filled with fine stone concrete.

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