BIM-based large basement outer wall waterproofing and drainage integrated structure

Abstract

The application discloses a large basement outer wall waterproof and drainage integrated structure based on BIM, and relates to the technical field of outer wall waterproof and drainage, in particular to the large basement outer wall waterproof and drainage integrated structure based on BIM.

Description

Technical Field

[0001] This invention belongs to the field of basement technology, and particularly relates to a BIM-based integrated structure for waterproofing and drainage of large basement exterior walls. Background Technology

[0002] Building Information Modeling (BIM) is a new tool for architecture, engineering, and civil engineering. It describes computer-aided design that is primarily based on three-dimensional graphics, object-oriented, and related to architecture. It integrates various information into a three-dimensional model information database, allowing design teams, construction units, facility operation departments, and owners to collaborate based on BIM, effectively improving work efficiency, saving resources, reducing costs, and achieving sustainable development.

[0003] Because basements are located underground and below the water level, they are incompatible with the sewage drainage system on the ground. Therefore, a separate sewage drainage structure needs to be designed. Since the outer walls of the basement are close to the edges, the edges need to not only have waterproof and drainage functions, but also be compatible with the basement's drainage system. To this end, we designed a large-scale basement exterior wall waterproof and drainage integrated structure based on BIM. Summary of the Invention

[0004] Based on the technical problems existing in the background technology, this invention proposes an integrated waterproof and drainage structure for the exterior walls of large basements based on BIM.

[0005] This invention proposes a BIM-based integrated waterproofing and drainage structure for the exterior walls of large basements, comprising an exterior wall and a foundation. A support is provided between the exterior wall and the foundation. Multiple water pipes are connected to the exterior wall. A gap is formed between the exterior wall and the foundation. A first breaking mechanism is installed in the gap. One end of the multiple water pipes is connected to the first breaking mechanism. The first breaking mechanism includes a shell. A first cutting blade is slidably installed inside the shell. Second cutting blades are symmetrically arranged on both sides of the first cutting blade.

[0006] A second crushing mechanism is also fixedly installed in the gap. The first crushing mechanism is connected to the second crushing mechanism through a connecting pipe. A water pump is installed on the connecting pipe. The second crushing mechanism includes a cylinder. The connecting pipe is connected to the top of the cylinder. A discharge pipe is connected to the bottom of the cylinder. A water pump is also provided at the end of the discharge pipe away from the cylinder.

[0007] A top plate is fixedly connected to the outer side of the upper part of the exterior wall. A waterproof layer is applied to the connection between the exterior wall and the top plate. A wedge-shaped groove is opened on the foundation. An adsorption mechanism is installed on the wedge-shaped groove. The adsorption mechanism is connected to the discharge pipe.

[0008] Preferably, the support includes a support plate and a support column. The support plate includes multiple horizontal and vertical axes that are fixedly connected together in an alternating manner. The vertical axis is fixedly connected to the foundation through multiple support columns.

[0009] Preferably, baffles are installed at the upper ends of the first and second cutting blades. The first crushing mechanism also includes two rotating plates. Two first motors are fixedly installed on the top of the outer shell. The drive ends of the two first motors are fixedly connected to rotating shafts. The two rotating shafts are located above the upper end of the first cutting blade. One end of the two rotating plates is rotatably connected to the first cutting blade. The other end of the two rotating plates is rotatably connected to the two second cutting blades respectively. The middle position of the two rotating plates is rotatably connected to the inner wall of the outer shell through a connecting shaft. Springs are fixedly connected to the upper ends of the two second cutting blades. The end of the spring away from the second cutting blade is fixedly connected to the top of the outer shell.

[0010] Preferably, the second crushing mechanism further includes a drive shaft and a plurality of cutting discs fixedly mounted on the drive shaft. A second motor is installed at one end of the cylinder. The second motor is fixedly connected to the drive shaft through a drive end. The plurality of cutting discs mounted on the drive shaft are staggered. The cylinder is fixedly connected to the foundation through a base.

[0011] Preferably, the adsorption mechanism includes an output tube, one end of which is installed in a wedge-shaped groove, and the other end of which is connected to a discharge tube. A fixing block is snapped onto the surface of the output tube, and the fixing block is fixedly installed on the wedge-shaped groove.

[0012] Preferably, a rubber sheet is slidably connected to the end of the output pipe away from the discharge pipe, and suspension shafts are symmetrically fixedly connected to both sides of the rubber sheet. Limiting shafts are symmetrically arranged on the fixed block, and the two suspension shafts are slidably connected on the limiting shafts respectively.

[0013] Preferably, the two first motors are fixedly connected to the top of the housing by a fixing block, and the inner wall of the housing is provided with a plurality of limiting grooves, and the first cutting blade and the second cutting blade move up and down along the limiting grooves.

[0014] Preferably, the base is L-shaped, one end of the base is fixedly connected to one end of the cylinder, and the bottom of the base is fixedly connected to the foundation.

[0015] Preferably, each of the cutting discs is equipped with multiple blades.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. When there is sewage inside the exterior wall, the sewage will carry impurities. The sewage mixed with impurities will flow through the water pipe into the first crushing mechanism. The first crushing mechanism can cut and crush the impurities in the sewage, so that the sewage can be discharged smoothly.

[0018] 2. After the wastewater has been crushed once, it will be transported from the first crushing mechanism to the second crushing mechanism through the connecting pipe. The second crushing mechanism will crush the wastewater a second time, thereby crushing the impurities in the wastewater again. The second crushing can effectively crush the impurities and then smoothly transport them out through the discharge pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a BIM-based integrated waterproofing and drainage structure for the exterior walls of a large basement proposed in this invention.

[0020] Figure 2 This is a partial side view of a BIM-based integrated waterproofing and drainage structure for the exterior walls of a large basement proposed in this invention.

[0021] Figure 3 This is a partial top view of a BIM-based integrated waterproofing and drainage structure for the exterior walls of a large basement proposed in this invention.

[0022] Figure 4 This is a schematic diagram of the internal side structure of the first crushing mechanism;

[0023] Figure 5 This is a schematic diagram of the internal top structure of the first crushing mechanism;

[0024] Figure 6 This is a schematic diagram of the second crushing mechanism;

[0025] Figure 7 This is a schematic diagram of the adsorption mechanism.

[0026] In the diagram: 1. Exterior wall, 2. Roof slab, 3. Waterproof layer, 4. Foundation, 5. Support plate, 6. Column, 7. Water pipe, 8. First crushing mechanism, 9. Connecting pipe, 10. Second crushing mechanism, 11. Wedge groove, 12. Adsorption mechanism, 13. Outer shell, 14. First cutting blade, 15. Second cutting blade, 16. Rotating plate, 17. First motor, 18. Connecting shaft, 19. Rotating shaft, 20. Baffle, 21. Spring, 22. Cylinder, 23. Discharge pipe, 24. Drive shaft, 25. Cutting disc, 26. Base, 27. Fixing block, 28. Rubber sheet, 29. Suspension shaft, 30. Limiting shaft, 31. Output pipe. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Reference Figure 1-7 A BIM-based integrated waterproofing and drainage structure for the exterior wall of a large basement includes an exterior wall 1 and a foundation 4. A support is provided between the exterior wall 1 and the foundation 4. Multiple water pipes 7 are connected to the exterior wall 1. A gap is formed between the exterior wall 1 and the foundation 4. A first breaking mechanism 8 is installed in the gap. One end of the multiple water pipes 7 is connected to the first breaking mechanism 8. The first breaking mechanism 8 includes a housing 13. A first cutting blade 14 is slidably installed inside the housing 13. Second cutting blades 15 are symmetrically arranged on both sides of the first cutting blade 14.

[0029] A second crushing mechanism 10 is also fixedly installed in the gap. The first crushing mechanism 8 is connected to the second crushing mechanism 10 through a connecting pipe 9. A water pump is installed on the connecting pipe 9. The second crushing mechanism 10 includes a cylinder 22. The connecting pipe 9 is connected to the top of the cylinder 22. A discharge pipe 23 is connected to the bottom of the cylinder 22. A water pump is also provided at the end of the discharge pipe 23 away from the cylinder 22.

[0030] A top plate 2 is fixedly connected to the outer side of the upper end of the exterior wall 1. A waterproof layer 3 is applied at the connection between the exterior wall 1 and the top plate 2. A wedge-shaped groove 11 is opened on the foundation 4. An adsorption mechanism 12 is installed on the wedge-shaped groove 11. The adsorption mechanism 12 is connected to the discharge pipe 23.

[0031] The support frame includes a support plate 5 and support columns 6. The support plate 5 includes multiple horizontal and vertical axes, which are staggered and fixedly connected together. The vertical axes are fixedly connected to the foundation 4 via multiple support columns 6. The gap between the outer wall 1 and the foundation 4 is formed by the support frame. The support plate 5 is fitted and fixed to the bottom of the outer wall 1, and then supported and fixed by multiple support columns 6, thereby forming the gap. The first crushing mechanism 8 and the second crushing mechanism 10 can be installed in the gap.

[0032] The upper ends of the first cutting blade 14 and the second cutting blade 15 are equipped with baffles 20. The first crushing mechanism 8 also includes two rotating plates 16. Two first motors 17 are fixedly installed on the top of the outer shell 13. The drive ends of the two first motors 17 are fixedly connected to rotating shafts 19. The two rotating shafts 19 are located above the upper end of the first cutting blade 14. One end of the two rotating plates 16 is rotatably connected to the first cutting blade 14. The other end of the two rotating plates 16 is rotatably connected to the two second cutting blades 15 respectively. The middle position of the two rotating plates 16 is rotatably connected to the inner wall of the outer shell 13 through a connecting shaft 18. The upper ends of the two second cutting blades 15 are fixedly connected with springs 21. The end of the spring 21 away from the second cutting blade 15 is fixedly connected to the top of the outer shell 13.

[0033] When sewage enters the outer casing 13 through the water pipe 7, impurities in the sewage are cut into small pieces by the first cutting blade 14 and the second cutting blade 15. The two first motors 17 drive the two rotating shafts 19 to rotate through the drive end. When the rotating shaft 19 rotates to contact the upper end of the first cutting blade 14, it will press the first cutting blade 14 downward. The first cutting blade 14 moves downward to cut the impurities in the sewage. At the same time, when the first cutting blade 14 moves downward, since the upper end is connected to the rotating plate 16 and the middle position of the rotating plate 16 is restricted by the connecting shaft 18, due to the lever principle, one end of the rotating plate 16 will be downward and the other end will be upward. Since the second cutting blade 15 is connected to the top of the outer casing 13 through the spring 21, the elastic force of the spring 21 will cause the second cutting blade 15 to tend to move downward, and then the second cutting blade 15 will cut the impurities. With the rotation of the rotating shaft 19, the first cutting blade 14 and the second cutting blade 15 move up and down alternately to cut.

[0034] The second crushing mechanism 10 also includes a drive shaft 24 and multiple cutting discs 25 fixedly mounted on the drive shaft 24. A second motor is installed at one end of the cylinder 22, and the second motor is fixedly connected to the drive shaft 24 through the drive end. The multiple cutting discs 25 mounted on the drive shaft 24 are staggered. The cylinder 22 is fixedly connected to the foundation 4 through the base 26. When sewage enters the cylinder 22 through the connecting pipe 9, the second motor will drive the drive shaft 24 to rotate, and then the drive shaft 24 will drive the various cutting discs 25 mounted on it to rotate. As the cutting discs 25 rotate, the impurities in the sewage can be further crushed, thereby effectively allowing the sewage to be discharged smoothly.

[0035] The adsorption mechanism 12 includes an output pipe 31. One end of the output pipe 31 is installed at the wedge-shaped groove 11, and the other end of the output pipe 31 is connected to the discharge pipe 23. A fixing block 27 is snapped onto the surface of the output pipe 31 and is fixedly installed on the wedge-shaped groove 11. If water accumulates in the gap, the overflowing water can be pumped out through the output pipe 31 while the water pump is transporting sewage out through the discharge pipe 23.

[0036] A rubber sheet 28 is slidably connected to the end of the output pipe 31 away from the discharge pipe 23. Suspension shafts 29 are symmetrically fixed to both sides of the rubber sheet 28. Limiting shafts 30 are symmetrically arranged on the fixing block 27, and the two suspension shafts 29 are slidably connected to the limiting shafts 30 respectively. The two limiting shafts 30 limit the two suspension shafts 29. When water accumulates in the wedge-shaped groove 11, the buoyancy of the water causes the two suspension shafts 29 to float, allowing them to slide along the limiting shafts 30. This gradually exposes one end of the output pipe 31. Then, when the water pump draws water through the discharge pipe 23, the output pipe 31 extracts the accumulated water. When there is no water in the wedge-shaped groove 11, the rubber sheet 28 blocks and seals one end of the output pipe 31, preventing any impact on the use of the discharge pipe 23.

[0037] Two first motors 17 are fixedly connected to the top of the outer casing 13 by fixing blocks. Multiple limiting grooves are provided on the inner wall of the outer casing 13. The first cutting blade 14 and the second cutting blade 15 move up and down along the limiting grooves. The limiting grooves serve to limit the movement of the first cutting blade 14 and the second cutting blade 15, allowing them to move up and down along a trajectory to perform the cutting operation.

[0038] The base 26 is L-shaped, with one end fixedly connected to one end of the cylinder 22, and the bottom of the base 26 fixedly connected to the foundation 4. Connecting one end of the base 26 to one end of the cylinder 22 leaves the area below the cylinder 22 empty, providing space for the connection of the discharge pipe 23. Each cutting disc 25 is equipped with multiple blades. When the blades rotate in a staggered manner, they effectively crush impurities.

[0039] Water inevitably accumulates inside the outer wall 1. When sewage is present inside the outer wall 1, it carries impurities. The sewage mixed with impurities will flow along the water pipe 7 into the first crushing mechanism 8. The first crushing mechanism 8 can cut and crush the impurities in the sewage, so that the sewage can be discharged smoothly. After the first crushing, the sewage will be transported from the first crushing mechanism 8 to the second crushing mechanism 10 through the connecting pipe 9. The second crushing mechanism 10 will crush the sewage a second time, thereby crushing the impurities in the sewage again. The second crushing can effectively crush the impurities and then be transported smoothly through the discharge pipe 23. Since there is a gap between the edge of the outer wall 1 and the external environment, sewage may directly enter the gap. The sewage will accumulate along the inclined surface of the wedge groove 11. The sewage accumulated at the wedge groove 11 will be transported out through the adsorption mechanism 12. A top plate 2 is also provided on the top of the outer wall 1. A waterproof layer 3 is adhered at the connection between the top plate 2 and the outer wall 1. The waterproof layer 3 and the top plate 2 block water and prevent water from entering the gap.

[0040] When wastewater enters the outer casing 13 of the first crushing mechanism 8, the first motor 17 drives the corresponding rotating shaft 19 to rotate via the drive end. The rotation of the rotating shaft 19 exerts a downward pressing force on the first cutting blade 14, thereby causing the first cutting blade 14 to cut the impurities in the wastewater. Since the upper end of the first cutting blade 14 is connected to the second cutting blade 15 via the rotating plate 16, and the middle section of the rotating plate 16 is rotatably connected to the inner wall of the outer casing 13 via the connecting shaft 18, the second cutting blades 15 on both sides will move upward under the action of the lever, and the spring 21 will be compressed. When the rotating shaft 19 rotates to the upward position, the first cutting blade 14 loses its force, and the second cutting blade 15 moves downward under the elastic action of the spring 21. Then the first cutting blade 14 moves upward accordingly, and the downward-moving second cutting blade 15 cuts the impurities under the action of the spring 21. The first cutting blade 14 and the second cutting blade 15 cut the impurities alternately, so that the impurities are crushed for the first time.

[0041] The water pump will pump the sewage inside the outer shell 13 into the cylinder 22 through the connecting pipe 9. The second motor in the second crushing mechanism 10 will drive the drive shaft 24 to rotate. The drive shaft 24 will drive each cutting disc 25 to rotate. Since each cutting disc 25 is staggered, as the second cutting blade 15 rotates, the impurities entering the cylinder 22 will be crushed a second time. The crushed sewage will be transported to the ground through the discharge pipe 23 under the action of the water pump, and then output in the corresponding sewage discharge system on the ground.

[0042] When there is sewage in the gap, water will accumulate at the wedge groove 11, and the suspension shaft 29 will float up under the action of buoyancy. The rubber sheet 28 will gradually detach from one end of the output pipe 31, and the suspension shaft 29 will slide upward along the fixing block 27. Thus, when the discharge pipe 23 pumps water outward, the water accumulated at the wedge groove 11 will also be pumped out through the output pipe 31, thereby effectively waterproofing and draining the area around the outer wall 1.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A BIM-based waterproof and drainage integrated structure for a large basement outer wall, comprising an outer wall (1) and a foundation (4), a support is arranged between the outer wall (1) and the foundation (4), and a plurality of water pipes (7) are connected to the outer wall (1), characterized in that, The gap is formed between the outer wall (1) and the foundation (4), the first crushing mechanism (8) is installed in the gap, one end of the plurality of water pipes (7) is communicated with the first crushing mechanism (8), the first crushing mechanism (8) comprises a shell (13), the first cutting knife (14) is slidably installed in the shell (13), the second cutting knife (15) is symmetrically arranged on both sides of the first cutting knife (14); The second crushing mechanism (10) is also fixedly installed in the gap, the first crushing mechanism (8) is connected with the second crushing mechanism (10) through the connecting pipe (9), the water pump is installed on the connecting pipe (9), the second crushing mechanism (10) comprises a cylinder (22), the connecting pipe (9) is connected above the cylinder (22), the discharge pipe (23) is connected below the cylinder (22), the water pump is also arranged on the end of the discharge pipe (23) away from the cylinder (22); The top plate (2) is fixedly connected to the outer side of the upper end of the outer wall (1), the waterproof layer (3) is applied to the connection between the outer wall (1) and the top plate (2), the wedge-shaped groove (11) is formed in the foundation (4), the adsorption mechanism (12) is arranged on the wedge-shaped groove (11), and the adsorption mechanism (12) is communicated with the discharge pipe (23); The baffle (20) is installed on the upper end of the first cutting knife (14) and the second cutting knife (15), the first crushing mechanism (8) further comprises two rotating plates (16), the two first motors (17) are fixedly installed on the top of the shell (13), the driving ends of the two first motors (17) are fixedly connected with the rotating shafts (19), the two rotating shafts (19) are arranged above the upper end of the first cutting knife (14), the rotating shafts (19) have downward pressing force on the first cutting knife (14) in the rotating process, one end of the two rotating plates (16) is rotatably connected with the first cutting knife (14), the other end of the two rotating plates (16) is rotatably connected with the two second cutting knives (15) respectively, the middle positions of the two rotating plates (16) are rotatably connected with the inner wall of the shell (13) through the connecting shaft (18), the upper ends of the two second cutting knives (15) are fixedly connected with the springs (21), and the ends of the springs (21) away from the second cutting knives (15) are fixedly connected with the top of the shell (13); The adsorption mechanism (12) comprises the output pipe (31), one end of the output pipe (31) is installed at the wedge-shaped groove (11), the other end of the output pipe (31) is communicated with the discharge pipe (23), the surface of the output pipe (31) is clamped with the fixed block (27), and the fixed block (27) is fixedly installed on the wedge-shaped groove (11); The rubber sheet (28) is slidably connected to the end of the output pipe (31) away from the discharge pipe (23), the suspension shafts (29) are fixedly connected to the both sides of the rubber sheet (28) symmetrically, the limiting shafts (30) are symmetrically arranged on the fixed block (27), and the two suspension shafts (29) are slidably connected on the limiting shafts (30) respectively.

2. The BIM-based waterproofing and drainage integrated structure for an external wall of a large basement according to claim 1, characterized in that, The support includes a support plate (5) and a support column (6), the support plate (5) includes a plurality of horizontal shafts and vertical shafts which are fixedly connected together in an interlaced manner, and the vertical shafts are fixedly connected with the foundation (4) through the plurality of support columns (6).

3. The BIM-based waterproofing and drainage integrated structure for an external wall of a large basement according to claim 2, characterized in that, The second crushing mechanism (10) further comprises a driving shaft (24) and a plurality of cutting discs (25) fixedly installed on the driving shaft (24), one end of the cylinder (22) is provided with a second motor, the second motor is fixedly connected with the driving shaft (24) through a driving end, and the plurality of cutting discs (25) installed on the driving shaft (24) are arranged in a staggered manner, and the cylinder (22) is fixedly connected with the foundation (4) through a base (26).

4. The BIM-based waterproofing and drainage integrated structure for an external wall of a large basement according to claim 3, characterized in that, The two first motors (17) are fixedly connected with the top of the shell (13) through a fixed block, a plurality of limiting grooves are arranged on the inner wall of the shell (13), and the first cutting knife (14) and the second cutting knife (15) move up and down along the limiting grooves.

5. The BIM-based waterproofing and drainage integrated structure for an external wall of a large basement according to claim 4, characterized in that, The base (26) is L-shaped, one end of the base (26) is fixedly connected with one end of the cylinder (22), and the bottom of the base (26) is fixedly connected with the foundation (4).

6. The BIM-based waterproofing and drainage integrated structure for an external wall of a large basement according to claim 5, characterized in that, A plurality of blades are installed on each cutting disc (25).

7. The drainage method of the BIM-based large basement exterior wall waterproofing and drainage integrated structure according to claim 5, characterized in that, The steps are as follows: When there is sewage in the outer wall (1), impurities will be carried in the sewage, and the sewage mixed with impurities will flow into the first crushing mechanism (8) along the water pipe (7), the first crushing mechanism (8) can cut and crush the impurities in the sewage, and the sewage can be smoothly discharged, the sewage crushed once will be transported into the second crushing mechanism (10) from the first crushing mechanism (8) through the connecting pipe (9), the second crushing mechanism (10) crushes the sewage twice to crush the impurities in the sewage again and is smoothly transported out through the discharge pipe (23), since there is a gap between the edge of the outer wall (1) and the external environment, the sewage directly enters the gap, the sewage will accumulate along the inclined surface of the wedge-shaped groove (11), and the sewage accumulated at the wedge-shaped groove (11) will be transported out through the adsorption mechanism (12), and the top plate (2) is further arranged on the top of the outer wall (1), the connecting part between the top plate (2) and the outer wall (1) is coated with a waterproof layer (3), and the waterproof layer (3) and the top plate (2) block water; When the sewage enters into the shell (13) in the first crushing mechanism (8), the first motor (17) drives the corresponding rotating shaft (19) to rotate through the driving end, and the rotating shaft (19) has a downward pressing force on the first cutting knife (14) in the rotating process, and the first cutting knife (14) cuts the impurities in the sewage. Since the upper end of the first cutting knife (14) is connected with the second cutting knife (15) through the rotating plate (16), and the middle section of the rotating plate (16) is rotationally connected with the inner wall of the shell (13) through the connecting shaft (18), under the lever action, the second cutting knife (15) on both sides will move upward, and the spring (21) will be compressed. When the rotating shaft (19) rotates to the upward position, the first cutting knife (14) loses the force, the second cutting knife (15) moves downward under the elastic action of the spring (21), and then the first cutting knife (14) moves upward, the second cutting knife (15) moving downward cuts the impurities under the action of the spring (21), and the first cutting knife (14) and the second cutting knife (15) alternately cut the impurities, so that the impurities are crushed for the first time; The water pump will pump the sewage in the shell (13) into the cylinder (22) through the connecting pipe (9), the second motor in the second crushing mechanism (10) drives the driving shaft (24) to rotate, and the driving shaft (24) drives each cutting disc (25) to rotate. Since each cutting disc (25) is arranged staggered, the impurities entering the cylinder (22) will be crushed for the second time with the rotation of the second cutting knife (15), and the crushed sewage will be transported to the ground through the discharge pipe (23) under the action of the water pump, and then output in the corresponding sewage discharge system on the ground; When there is sewage in the gap, water will accumulate in the wedge-shaped groove (11), the suspension shaft (29) will float up under the action of the buoyancy, and the rubber sheet (28) will gradually separate from one end of the output pipe (31), and the suspension shaft (29) will slide upward along the fixed block (27), so that when the discharge pipe (23) pumps water outward, the water in the wedge-shaped groove (11) will also be pumped out through the output pipe (31), and the surrounding of the outer wall (1) is waterproofed and drained.

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