Construction method for drain holes of retaining wall based on water-rich area

Abstract

The invention discloses a construction method based on a retaining wall drain hole in a water-rich area, and belongs to the technical field of building construction. Comprising the following steps that 1, the drainage pipe is punched and assembled, and related materials are prepared; secondly, backfilling and waterproof treatment are conducted on the wall back, an inverted filter layer, a leveling layer and waterproof cloth are laid, and excavation face water seepage geotechnical cloth is laid; 3, installing and fixing a drainage pipe, and treating an inlet end and an outlet end. According to the construction method, the construction method is simple, convenient, rapid and easy to operate, too high technical difficulty is avoided, too much construction cost is not increased, the safety risk of wall collapse caused by the fact that the wall back cannot drain water or cannot drain water due to nonstandard construction of the water drain pipe in the water-rich area is greatly reduced, too large property loss is avoided, and life safety is effectively guaranteed. And in the later period, silt clogging possibly existing in the wall-in-pipe can be washed through a high-pressure water gun through a pipe inlet, maintenance is easy, and larger losses and secondary disasters are prevented from occurring.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for constructing drainage holes of retaining walls in water-rich areas. Background Art

[0002] Retaining wall is a very common load-bearing structure. It has many different names depending on the construction location, construction materials, load-bearing method, cross-sectional structure and other types. It involves infrastructure such as building construction, roads, railways, tunnels, bridges, dams, reservoirs, and industrial and civil buildings.

[0003] The drainage hole is a drainage structure set inside and behind the retaining wall. When constructing the retaining wall, embedded parts or reserved drainage channels should be left in the wall. Square or round holes can be directly formed when masonry is made of materials such as stone blocks, or special pipes can be placed. A granular filter layer is set at the inlet of the drainage hole behind the wall. During the concrete pouring or masonry construction process, it is very likely that the water inlet of the drainage hole will be blocked by mortar or the hole will collapse. Especially in areas with abundant surface water and abundant rainfall, or during long-lasting rainfall or heavy rain, the drainage function of the drainage pipe is more important. During long-term use, there is also a possibility that the soil at the water inlet will wrap the granular filter layer and cause blockage. In the mild case, the drainage efficiency of the drainage hole will decrease, and in the severe case, the drainage hole will be blocked and unable to drain. When the drainage hole is blocked and cannot be drained or the drainage is not smooth, the retaining wall will be displaced, cracked, tilted or even collapsed, which is very likely to cause property loss or casualties, with great impact. At the same time, when the retaining wall collapses, it has to be demolished and rebuilt, which is costly. Therefore, a construction method of water leakage holes in retaining walls in water-rich areas is proposed. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a construction method for drainage holes in retaining walls in water-rich areas, so that drainage pipes are not easily blocked and drainage is smooth, the entire process is more convenient and quick, time-saving and labor-saving, and the safety risk of wall collapse caused by the inability or inability of the wall back to drain water is effectively reduced, property losses are avoided and life safety is ensured, and the cost of later management and maintenance can also be saved.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for constructing a drainage hole in a retaining wall in a water-rich area comprises the following steps:

[0007] Step 1: Drill holes for the drainage pipe, assemble it and prepare related materials;

[0008] Step 2: Backfill and compact the wall, and lay the back filter layer, leveling layer, waterproof layer, and permeable geotextile;

[0009] Step 3: Install the retaining wall formwork, select the installation position of the retaining wall drainage hole, install the drainage pipe, install the front end of the drainage pipe inside the wall structure and extend it into the backfill of the wall without exceeding the excavation line. The drainage pipe inside the wall structure is fixed by a fixing frame;

[0010] Step 4: Temporarily block the inlet and outlet of the drainage pipe inside the wall, and mark the inlet and outlet connection positions on both sides of the template;

[0011] Step 5: Cast or build the retaining wall, remove the formwork after curing, and remove the temporary blocked drainage pipe inlet materials;

[0012] Step 6: Install the pipe connector and the inlet end of the drainage pipe outside the wall;

[0013] Step 7: Stack the bags, the inside of which is made of permeable hard materials such as sand, gravel and pebbles with good water permeability and not easy to weather. Lay the filter layer and the backfill of the construction wall. The materials used for the filter layer and the backfill of the construction wall should be the same as the materials of the lower part of the drainage pipe, or the permeability and strength technology should be higher than the backfill index of the wall;

[0014] Step 8: Check whether the drainage pipe is intact, check whether it is stable, deformed, and unobstructed, and install a mesh cover on the outlet end, which can be opened at any time. Later, you can use a high-pressure gun to flush the soil in the pipe to prevent blockage and foreign objects from entering the pipe. At the same time, it can make the wall surface coordinate with the surrounding environment and increase the aesthetics.

[0015] As a further optimization scheme of the present invention, in step one, the specific steps of assembling the drain pipe are:

[0016] First, connect one end of the two pipe connectors to the corrugated hose, then connect the end of the pipe connector away from the corrugated hose to the drain pipe, connect the outside of one of the pipe connectors to the grille and open multiple seepage holes on the grille, finally, use two straps to wrap around the outside of the grille to fix it. The binding should be firm, or tighten with a hoop.

[0017] As a further optimization scheme of the present invention, in step one, the specific steps of assembling the drain pipe are:

[0018] Wrap the grille net around the outside of the drain pipe and open multiple seepage holes on the grille net. Finally, use two straps to wrap around the outside of the grille net to fix it. The strapping should be firm.

[0019] As a further optimization scheme of the present invention, in step one, a plum blossom-shaped hole is punched at the inlet pipe end of the drainage pipe, the inlet is wrapped with a geogrid and then tied and fixed, and the outlet is closed with the same type of material as the drainage pipe or is in a naturally open state.

[0020] As a further optimization scheme of the present invention, in step one, the aperture spacing of the grid mesh is smaller than the particle size of the gravel and pebbles in the pile capsule, and the outer extension of the inlet end of the drainage pipe is greater than 30 cm.

[0021] As a further optimization scheme of the present invention, in step 2, the installation location of the retaining wall drainage hole should be selected at the location or area where the surface, groundwater or layered, crack water is concentrated and easy to gather.

[0022] As a further optimization scheme of the present invention, in step 2, when it is inconvenient to punch holes in the outer mold, a connecting piece is used for connection, and the connecting piece is composed of a retractable component that is easy to connect the two ends.

[0023] As a further optimization scheme of the present invention, in step 2, when it is inconvenient to punch holes in the external mold, a connecting piece is used. The connecting piece is a special-shaped drain pipe. The front end diameter of the special-shaped drain pipe is slightly smaller than the diameter of the drain pipe. The inlet is sealed with an inlet pipe cover. The drain pipe is wrapped with a permeable cloth. The joint should be bonded and sealed when inserted. Except that the diameter of the connection is slightly smaller than the diameter of the drain pipe inside the wall, the diameter of the inlet end of the special-shaped drain pipe can be larger than the diameter of the drain pipe inside the wall.

[0024] As a further optimization scheme of the present invention, in step three, temporary blocking is to prevent the glue from clogging the drain pipe, and markings are made on both sides of the template to facilitate finding the original installation position after demolding, so as to facilitate dredging and verification;

[0025] As a further optimization scheme of the present invention, in step 5, the backfill material is a permeable material, and is leveled with M5 mortar with a thickness of not less than 10 cm, or with low-grade concrete with small stones with a thickness of not less than 20 cm;

[0026] Lay waterproof cloth on the smoothing layer or leveling layer, use waterproof cloth to fully cover the water-rich area, and lay permeable cloth on the excavation surface, with the permeable cloth extending above the waterproof cloth by no less than 10cm.

[0027] As a further optimization scheme of the present invention, in step six, the front end of the special-shaped drainage pipe is inserted into the drainage pipe in the wall. The special-shaped drainage pipe has holes around it and is wrapped with geotextile. The diameter of the special-shaped drainage pipe is not less than the diameter of the drainage pipe.

[0028] Step 6: Install the pipe connector and the inlet end of the drainage pipe outside the wall;

[0029] As a further optimization scheme of the present invention, in step six, the slope of the wall back connecting pipe should be the same as that of the front end or slightly greater than the slope of the front end.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] In the present invention, the drainage pipe material can be selected from a round or square lightweight material that is not easy to corrode, which is cheap and flexible to assemble. The inlet and outlet can select the inlet connection end components according to whether to set up a mold, and can also decide whether to seal the outlet with soil according to actual requirements. There are many choices and a wide range of applications.

[0032] In the present invention, all wrapping materials can be geogrids or other materials, with various choices. The plastic frame can be customized or made of discarded fruit baskets and other plastic frames. Waste utilization is energy-saving and environmentally friendly, and the price is low, without increasing construction costs and work burden.

[0033] In the present invention, the pile bag can be gravel, sand and pebbles or hard materials that are permeable and not easy to be weathered wrapped by geogrids, or gravel, sand and pebbles or hard materials that are permeable and not easy to be weathered piled in plastic frames. The materials can be obtained locally, and waste materials such as slag can also be recycled. The size of the pile bag can be selected according to its volume and material on site. The pile bag and frame can be one or more, and the weight can be selected according to the construction situation. It is easy to operate.

[0034] In the present invention, compared with the traditional coarse-grained material reverse filter layer filtration structure, multiple filtration and anti-blocking lines are added, which is not easy to block the inlet of the drainage hole and can ensure long-term stable drainage of water. The added leveling layer and waterproof cloth can effectively prevent the water from seeping behind the wall. The seepage cloth behind the wall can effectively block the mud in the soil behind the earth wall to prevent it from gathering at the hole mouth and blocking the hole. At the same time, the seepage cloth can evenly inject the generated water downward to the inlet, and the overall deformation and damage of the wall will not occur due to the sharp increase of surface water and groundwater.

[0035] In the present invention, the construction method is simple, convenient, fast and easy to operate, without too high technical content and without increasing a large amount of construction costs, which greatly reduces the safety risk of wall collapse caused by the inability or inability to drain water due to irregular drainage pipe construction in water-rich areas, avoids excessive property losses and effectively protects life. In the later stage, the possible silt blockage in the wall can be washed with a high-pressure water gun through the pipe mouth, which is simple to maintain and prevents greater losses and secondary disasters. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of Embodiment 1 of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the drainage pipe and the corrugated hose in the present invention;

[0038] Figure 3 It is a structural schematic diagram of Embodiment 2 of the present invention;

[0039] Figure 4 It is a schematic diagram of the structure of the drainage pipe and the grille net in the present invention;

[0040] Figure 5 It is a schematic diagram of the structure of the waterproof layer, the leveling layer and the filter layer in the present invention;

[0041] Figure 6 It is a schematic diagram of the structure of the inlet pipe cover and the special-shaped drain pipe in the present invention.

[0042] In the figure: 1. Wall structure; 2. Excavation line; 3. Permeable geotextile; 4. Backfill on the wall; 5. Waterproof layer; 6. Leveling layer; 7. Filter layer; 8. Bag; 9. Drain pipe; 10. Outlet pipe cover; 11. Fixing frame; 12. Seepage hole at the water inlet end; 13. Binding tape; 14. Grille; 15. Pipe connector; 16. Corrugated hose; 17. Special-shaped drain pipe; 18. Inlet pipe cover; 19. Outer seepage cloth. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Embodiment 1

[0045] See also Figure 1 , Figure 2 , Figure 5 A method for constructing a drainage hole in a retaining wall in a water-rich area comprises the following steps:

[0046] Step 1: Punch and assemble the drain pipe, connect the grille net 14 and open a plurality of water seepage holes 12 on the inlet end of the drain pipe 9. Finally, use two straps 13 to wrap around the outside of the grille net 14 for tying and fixing.

[0047] Specifically, a plum blossom-shaped hole is drilled at the inlet pipe end of the drainage pipe 9, the inlet is wrapped with a geogrid and then tied and fixed, and the outlet is closed with the same type of material as the drainage pipe or is in a naturally open state.

[0048] The aperture spacing of the grid mesh 14 is smaller than the particle size of the gravel and pebbles in the capsule 8, and the length of the inlet end of the drainage pipe 9 extending outside the wall is greater than 30 cm.

[0049] A hoop may also be used to wrap around the outside of the grille net 14 for fixing and binding.

[0050] The drain pipe can be made of PVC, PE and other materials. In this embodiment, the PVC material is polyvinyl chloride, referred to as PVC, which is a polymer formed by the polymerization of vinyl chloride monomer in the presence of initiators such as peroxides and azo compounds, or under the action of light and heat according to the free radical polymerization mechanism. Vinyl chloride homopolymers and vinyl chloride copolymers are collectively referred to as vinyl chloride resins. The drain pipe made of PVC has the advantages of light material, waterproof and moisture-proof, long service life of the grille, low price, easy to buy in the market, and the wall has been formed in the later stage without affecting the drainage function of the drain hole.

[0051] The grid net 14 wrapped at the inlet is a common geogrid, which can be tied and reinforced with nylon and other materials to prevent mud and sand from blocking in the later stage. The holes at the end of the inlet pipe of the drainage pipe 9 are punched in a plum blossom shape to facilitate the smooth flow of upper water into the pipe. The aperture spacing of the grid net 14 should be smaller than the permeable hard material of the sand, gravel and pebble particle size in the heap 8.

[0052] Step 2: Install the retaining wall formwork, select the installation position of the retaining wall drainage hole, install the drainage pipe 9, and install the drainage pipe 9 inside the wall structure. The drainage pipe outlet should be 30 cm higher than the top surface of the retaining wall foundation, and the inlet should not be lower than the excavation line 2. The drainage pipe 9 located inside the wall structure 1 is fixed by a fixing frame 11.

[0053] Specifically, the installation location of the retaining wall drainage hole should be selected in the area where the surface and groundwater levels are concentrated and easy to gather. When there is an external mold that is inconvenient to drill holes, use connectors to connect. The connectors are retractable and easy to connect components at both ends;

[0054] More specifically, the drainage pipe 9 is set in the area where the surface and groundwater levels are concentrated and easy to gather. The erected template should be stable, the drainage longitudinal slope of the drainage pipe should be controlled at 3-5%, and the lower part should be fixed with a non-rusting, corrosion-resistant belt slot, bracket, or a piece of stone as a fixation to prevent it from moving or deforming. The connection between the drainage pipe 9 and the outer mold of the retaining wall is marked and the outlet end is temporarily blocked in advance, and the length of the back end of the wall extending into the pile bag 8 is not less than 30cm, so as to facilitate drainage and drainage.

[0055] The retaining wall can be a mortar-laid stone structure, or a stone concrete, concrete, or reinforced concrete structure. The choice of structure does not affect the setting and construction of the water inlet of the drainage hole.

[0056] Step 3: Temporarily block the inlet and outlet of the drainage pipe inside the wall, and mark the inlet and outlet connection positions on both sides of the template;

[0057] Specifically, temporary sealing is to prevent the glue from clogging the drain pipe, and marking on both sides of the template is to facilitate finding the original installation position after removing the template, which is convenient for dredging and verification.

[0058] In this embodiment, a combination of a drilled drainage pipe 9, a grille mesh 14, and crushed sand, gravel and pebbles is used to form a water inlet filtration structure of the drain pipe. Compared with the traditional coarse-grained material filter layer filtration structure, it is less likely to be clogged, and the process is more convenient and quick, saving time and effort, and effectively reducing the safety risk of wall collapse caused by the inability or inability of the wall back to drain water, avoiding property loss and ensuring life safety, while also saving subsequent management and maintenance costs.

[0059] Step 4: Cast or build the retaining wall, remove the formwork after curing, and remove the temporary blocked drainage pipe inlet materials;

[0060] In some embodiments of the present invention, the grid mesh 14 is a geogrid.

[0061] When the grid net 14 is a geogrid, the grid net can be a single layer or multiple layers, and is firmly tied at the front and rear ends.

[0062] It should be noted that the average length, width and height of the stack capsule is not less than 50 cm, which is a value commonly used in construction and does not limit the length, width and height of the grid mesh 14. In other embodiments, other values ​​may also be used.

[0063] It should be noted that the particle size of crushed sand, gravel and pebbles is 5 to 8 cm, which is a common value often used in construction. It is not a limitation on the particle size. In other embodiments, other values ​​may also be used.

[0064] Step 5: Backfill and compact the wall, and lay the back filter layer, leveling layer, and waterproof layer permeable cloth;

[0065] Specifically, the backfill material is a permeable material, and is leveled with M5 mortar with a thickness of not less than 10 cm, or with low-grade concrete with small stones with a thickness of not less than 20 cm;

[0066] Lay waterproof cloth on the smoothing layer or leveling layer, fully cover the water-rich area with waterproof cloth, and lay permeable cloth on the excavation surface, with the permeable cloth extending above the waterproof cloth by no less than 10cm.

[0067] Step 6: Install the connector and the inlet end of the drainage pipe outside the wall;

[0068] Specifically, the slope of the inlet end portion is the same as or slightly greater than the slope of the drainage pipe and the connecting piece.

[0069] Step 7: Stack the pile 8, set sand and gravel inside, lay the filter layer 7 and the backfill 4 of the construction wall. The materials used for the filter layer 7 and the backfill 4 of the construction wall should be the same as the lower part of the drainage pipe, or the permeability and strength technology should be higher than the backfill index of the wall;

[0070] Specifically, the pile bag 8 is a geogrid wrapped with gravel, gravel and pebbles, which is a hard material with good water permeability. The pile bag can be composed of one or more, each of which is firmly tied, and the minimum side size of the pile bag or frame is not less than 50cm;

[0071] Step 8: Check the drainage pipes to see if they are stable, deformed, or unobstructed. Set a mesh cover 10 at the outlet end, which can be opened at any time. Later, you can use a high-pressure gun to flush the soil in the pipe to prevent blockage and foreign matter from entering the pipe. At the same time, ensure that the wall is in harmony with the surrounding environment to increase the aesthetics.

[0072] Specifically, after the construction is completed, the soil in the pipe can be flushed with a high-pressure gun to prevent blockage in the pipe, while ensuring the coordination and beauty of the wall surface. The mesh cover 10 can be made of the same material as the pipe.

[0073] Embodiment 2

[0074] See also Figure 1 , Figure 2 , Figure 5 , which is different from the first embodiment in that:

[0075] The pile bag 8 is a plastic frame for stacking gravel, gravel and other hard materials with good water permeability, and a water-permeable cloth is laid on the upper part thereof. The plastic frame can be composed of one or more, each of which is stacked stably, and the minimum side size is not less than 50 cm.

[0076] Embodiment 3

[0077] See also Figure 3 , Figure 4 , Figure 5 , which is different from the first embodiment in that:

[0078] Punch holes for the drain pipe 9, assemble and prepare relevant materials, connect one end of the two pipe connectors 15 to the corrugated hose 16, and then connect the end of the pipe connector 15 away from the corrugated hose 16 to the drain pipe 9, the outside of one of the pipe connectors 15 is connected to the grille 14 and a plurality of seepage holes 12 are opened on the inlet end of the grille drain pipe 9, and finally, use two straps 13 to wrap around the outside of the grille 14 for binding and fixing.

[0079] The pile bag 8 can be a hard material with good water permeability of gravel and gravel eggs wrapped in geotextile or a hard frame with good water permeability of gravel and gravel eggs piled with plastic. The pile bag can be composed of one or more, each of which should be tied firmly and installed stably.

[0080] Embodiment 4

[0081] See also Figure 6 , which is different from the third embodiment in that:

[0082] After the rear formwork and holes are cast in the retaining wall, when it is unobstructed and meets the requirements after inspection, the back of the wall is backfilled and compacted, and the back filter layer 7, leveling layer 6, waterproof layer 5, and permeable geotextile 3 are laid. The water inlet end of the back of the wall is connected with a special-shaped drainage pipe 17, the front end diameter is slightly smaller than the diameter of the drainage pipe 9, and the inlet is blocked with an inlet pipe cover 18. The special-shaped drainage pipe 17 and the inlet pipe cover 18 are both wrapped with permeable cloth 19 to prevent clogging by mud and sand. The insertion end of the special-shaped drainage pipe 17 should be bonded and sealed. Except for the connection part where the diameter of the special-shaped drainage pipe 17 is slightly smaller than the diameter of the drainage pipe 9 inside the wall, the diameter of the outer part of the wall is not less than the diameter of the drainage pipe 9 inside the wall to ensure sufficient drainage.

[0083] Embodiment 5

[0084] The difference from the first to fourth embodiments is that:

[0085] In step 2, when it is inconvenient to drill holes in the outer mold and directly delay the delay, a special-shaped drainage pipe 17 with holes all around and a diameter slightly smaller than the diameter of the drainage pipe 9 is used at the water inlet end. The special-shaped drainage pipe 17 is blocked with an inlet pipe cover 18, and the drainage pipe is wrapped with a permeable cloth 19.

[0086] Specifically, the joint is bonded and sealed during insertion. Except that the diameter of the connection is slightly smaller than the diameter of the drainage pipe 9 in the wall, the diameter of the inlet end of the special-shaped drainage pipe 17 can be larger than the diameter of the drainage pipe 9 in the wall.

[0087] Parts not involved in the present invention are the same as the prior art or can be implemented by the prior art. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing drainage holes in retaining walls in water-rich areas, characterized in that: The following steps are involved: Step 1: drilling holes for the drainage pipe (9), assembling and preparing relevant materials; Step 2: backfill and compact the wall back, and lay the wall back filter layer (7), leveling layer (6), waterproof layer (5), and permeable geotextile (3); Step 3: Install the retaining wall formwork, select the installation position of the retaining wall drainage hole, install the drainage pipe (9), install the front end of the drainage pipe (9) inside the wall structure and extend it into the backfill (4) of the wall without exceeding the excavation line (2), and fix the drainage pipe (9) inside the wall structure (1) through the fixing frame (11); Step 4: Temporarily block the inlet and outlet of the drainage pipe (9) inside the wall, and mark the positions of the inlet and outlet connections on both sides of the template; Step 5: Cast or build the retaining wall, remove the formwork after curing, and remove the inlet materials of the temporarily blocked drainage pipe (9); Step 6: Install the pipe connector (15) and the inlet end of the drainage pipe (9) outside the wall; Step 7: stacking the heap bag (8), the interior of which is made of sandstone, gravel and pebble water-permeable hard materials with good water permeability and not easy to weather, laying the filter layer (7) and the construction wall backfill (4) part. The materials used for the filter layer (7) and the construction wall backfill (4) should be the same as the material of the lower part of the drainage pipe, or the water permeability and strength technology should be higher than the wall backfill index; Step 8: Check the drainage (9) water pipe to see if it is intact, whether it is stable, deformed, or unobstructed. Set a mesh cover (10) on the outlet end, which can be opened at any time. In the later stage, you can use a high-pressure gun to flush the soil in the pipe to prevent blockage and foreign matter from entering the pipe. At the same time, it can make the wall surface coordinate with the surrounding environment and increase the aesthetics.

2. The method for constructing drain holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step 1, the specific steps of assembling the drain pipe (9) are: First, one end of the two pipe connectors (15) is connected to the corrugated hose (16), and then the end of the pipe connector (15) away from the corrugated hose (16) is connected to the drain pipe (9), the outside of one of the pipe connectors (15) is connected to the grille (14) and a plurality of water seepage holes (12) are opened on the inlet end of the drain pipe (9), and finally, two binding bands (13) are used to wrap around the outside of the grille (14) to bind and fix; Secondly, the special-shaped drain pipe (17) is inserted into the drain pipe (9) and sealed and fixed, the inlet drain pipe cover (18) is covered, and the special-shaped drain pipe (17) is wrapped with an outer water-permeable cloth (19).

3. The method for constructing drainage holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step 1, the specific steps of assembling the drain pipe (9) are: The grille net (14) is wound around the outside of the drainage pipe (9) and a plurality of water seepage holes (12) are opened at the inlet end of the drainage pipe (9). Finally, two binding bands (13) are used to wrap around the outside of the grille net (14) for binding and fixing.

4. A method for constructing drain holes in retaining walls in water-rich areas according to claim 2 or 3, characterized in that: In step one, a plum blossom-shaped seepage hole (12) is drilled at the inlet pipe end of the drainage pipe (9), the inlet is wrapped with a geogrid and then tied and fixed, and the outlet is sealed with the same type of material as the drainage pipe or is in a naturally open state.

5. A method for constructing drain holes in retaining walls in water-rich areas according to claim 2 or 3, characterized in that: In step 1, the aperture spacing of the grid net (14) is smaller than the particle size of the gravel and pebble water-permeable material in the capsule to prevent it from falling into the drainage pipe (9), and the extension length of the inlet end of the drainage pipe (9) outside the wall is greater than 30 cm.

6. The method for constructing drainage holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step 2, the installation location of the retaining wall drainage hole should be selected at the location or area where the surface, groundwater or layered, crack water is concentrated and easy to gather.

7. The method for constructing drainage holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step 2, when there is an external mold that is inconvenient to punch holes and directly extend outward, a connector (15) is used for connection. The connecting piece is a retractable, easy-to-connect hose (16). The components at both ends or the water inlet end are made of a special-shaped drainage pipe (17) with holes all around and a diameter slightly smaller than the diameter of the drainage pipe (9). The special-shaped drainage pipe (17) is blocked with an inlet pipe cover (18). The drainage pipe is wrapped with a water-permeable cloth (19) to facilitate water infiltration and prevent sediment from clogging the pipeline.

8. The method for constructing drainage holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step three, temporary sealing is to prevent the glue from clogging the drain pipe. Marking on both sides of the template makes it easy to find the original installation position after removing the template, which is convenient for unblocking and verification.

9. The method for constructing drainage holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step 5, the backfill material is a permeable hard material, and is leveled with M5 mortar with a thickness of not less than 10 cm, or with low-grade concrete with small stones with a thickness of not less than 20 cm; Lay waterproof cloth on the smoothing layer or leveling layer, use waterproof cloth to fully cover the water-rich area, lay permeable cloth on the excavation surface, and the length of the permeable cloth extending above the waterproof cloth should be no less than 10cm.

10. The method for constructing drainage holes in retaining walls in water-rich areas according to claim 1, characterized in that: In step six, the slope of the wall back connecting pipe is the same as that of the front end or slightly greater than the slope of the front end.

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