Sewage drainage structure

Abstract

The sewage drainage structure comprises a mounting groove which is formed in the top face of the ground and extends left and right, the bottom face of the middle of the mounting groove corresponds to and communicates with a drainage ditch groove body which is formed below the mounting groove and penetrates front and back, and a stone plate layer is laid on the ground and covers the whole mounting groove. A central through groove is formed in the stone plate layer right above the middle part of the mounting groove, and the sewage filtering plate is placed in the stone plate layer and covers the central through groove; according to the sewage filter plate, solid substances falling from the vertical circulating through holes of the sewage filter plate can be located in the middle filter tank body and cannot fall into the drainage ditch tank body, so that the falling solid substances are convenient to take, and the drainage ditch tank body can be prevented from being blocked.

Description

Technical field:

[0001] The present invention relates to the technical field of sewage treatment equipment, and more particularly to a sewage drainage structure. Background technology:

[0002] Waterlogging on road surfaces is not only extremely detrimental to traffic safety, but long-term waterlogging may also cause overall damage to the roadbed and ultimately lead to early damage to the road surface.

[0003] When designing urban roads, in order to ensure traffic safety, improve urban environmental conditions, and avoid premature damage to the road surface, it is required to quickly and promptly remove road surface water.

[0004] Therefore, drainage structures are usually set up on roadside sidewalks or pedestrian walkways in some parks so that the sewage on the road surface can be discharged.

[0005] The road drainage includes a road surface drainage portion and a roadside drainage portion, and the roadside drainage portion includes drainage grooves arranged on both sides of the road.

[0006] The existing drainage system generally lays a cover plate with filtering holes above the drainage ditch. This structure cannot filter some granular solid matter from entering the drainage ditch, making the drainage ditch easy to be blocked. At the same time, pedestrians sometimes accidentally drop small objects such as coins into the drainage ditch through the filtering holes of the cover plate when walking. Especially in some heavy rain conditions, when there is water flowing in the drainage ditch, the dropped objects will immediately flow with the water, making it impossible for people to retrieve them in time, and the effect is not ideal. Summary of the invention:

[0007] The purpose of the present invention is to address the deficiencies of the prior art and provide a sewage drainage structure, which can keep solid matter falling from the vertical straight flow through holes of the sewage filter plate in the middle filter tank body and prevent it from falling into the drainage ditch tank body, making it easy to take out the fallen solid matter and preventing the drainage ditch tank body from being blocked. Moreover, when it is necessary to inspect and maintain the middle filter tank body and the protective filter cover, the middle filter tank body can be moved to the left so that the second filter tank body covers the sewage filter plate, and the filtering effect can continue to be achieved through the second filter tank body, so that external solid matter will not fall into the drainage ditch tank body, ensuring that the drainage ditch tank body is in a normal unblocked state.

[0008] The technical solutions of the present invention are as follows:

[0009] A sewage drainage structure, comprising a mounting groove extending left and right formed on the top surface of the ground, the bottom surface of the middle part of the mounting groove corresponds to and communicates with a drainage groove body extending front and back and arranged below it, a slate layer is paved on the ground, the slate layer covers the entire mounting groove, a central through groove is formed on the slate layer just above the middle part of the mounting groove, and a sewage filter plate is placed in the slate layer and covers the central through groove;

[0010] The front wall surface and the rear wall surface of the installation groove are both formed with side installation grooves extending forward or backward, and the side connection blocks extending left and right are nested in the corresponding side installation grooves, and the outer wall surface of the side connection block is pressed against the inner wall of the corresponding side installation groove and fixedly connected;

[0011] A guide rail extending left and right is fixed in the middle of the opposite wall surfaces of the two side connection blocks, the middle filter tank body is located in the middle between the two side connection blocks, the middle filter tank body is located directly below the sewage filter plate, all vertical flow through holes on the sewage filter plate face the top surface of the bottom plate of the middle filter tank body, and the upper parts of the outer side walls of the front and rear wall plates of the middle filter tank body are fixed with a horizontal support plate, and the horizontal support plate is located directly above the corresponding guide rail;

[0012] A plurality of middle through holes are formed on the bottom plate of the middle filter tank body.

[0013] Elastic limiting plates are fixed on both left and right end surfaces of the installation groove.

[0014] A second filter tank body is provided on the right side of the middle filter tank body, and second horizontal support plates are fixed on the upper outer walls of the front and rear wall plates of the second filter tank body, and the second horizontal support plates are located above the two guide rails.

[0015] A right connecting block is fixed on the right side wall of the right side plate of the second filter tank body, a vertical through hole is formed in the middle of the right connecting block, and the right side wall of the right connecting plate is pressed against the left side wall of the elastic limiting plate on the right side.

[0016] A transverse connecting column is fixed in the middle of the left side plate of the second filter tank body, and a radially extending annular body portion is formed on the outer side wall of the left end of the transverse connecting column;

[0017] A connecting block is fixed in the middle of the right side wall of the central filter tank body, and a downwardly extending slot is formed in the middle of the top surface of the connecting block. The right end of the slot extends out of the right side wall of the connecting block, and an extended blocking portion is formed on the inner wall of the right end of the slot. The transverse connecting column is inserted into the slot and cooperates with the slot, and the ring body is located on the left side of the extended blocking portion and corresponds to it.

[0018] A left connecting block is fixed on the left side wall of the left side plate of the middle filter tank body, a vertical through hole is formed in the middle of the left connecting block, and the left side wall of the left connecting block corresponds to the right side wall of the left elastic limiting plate.

[0019] A plurality of second through holes are formed in the middle of the bottom plate of the second filter tank body, and a filter screen plate is fixed on the top surface of the bottom plate of the second filter tank body and covers all the second through holes, and mesh holes are formed on the filter screen plate.

[0020] A right maintenance slot is formed on the stone slab layer at the right side of the sewage filter plate, the right maintenance slot faces the second filter tank body, and the right maintenance plate is installed on the stone slab layer and covers the right maintenance slot.

[0021] A left maintenance slot is formed on the stone slab layer at the left side of the sewage filter plate, the left maintenance slot faces the left part of the installation groove, and the left maintenance plate is installed on the stone slab layer and covers the left maintenance slot.

[0022] The lower inner walls of the central through groove, the left inspection through groove and the right inspection through groove are all formed with rectangular frame-shaped horizontal radial extension edges extending along the corresponding four inner walls, the top surfaces of the horizontal radial extension edges are formed with rectangular frame-shaped sealing grooves, and the rectangular sealing strips are nested in the sealing grooves. The bottom surfaces of the edges of the left inspection plate, the right inspection plate and the sewage filter plate are pressed against the top surfaces of the corresponding horizontal radial extension edges and against the top surfaces of the corresponding sealing strips.

[0023] The upper middle part of the front and rear inner walls of the left inspection slot and the right inspection slot are formed with a placement groove extending horizontally outward, and the middle parts of the front and rear walls of the left inspection plate and the right inspection plate are movably connected with a handle, which is located in the corresponding placement groove, and its bottom surface is pressed against the bottom surface of the corresponding placement groove.

[0024] A rectangular sleeve is fixed to the bottom surface of the sewage filter plate, the rectangular sleeve is inserted into the middle filter tank, and its bottom end surface is pressed against the top surface of the bottom plate of the middle filter tank, all vertical flow through holes are connected to the rectangular sleeve, and all the middle through holes of the middle filter tank are connected to the rectangular sleeve;

[0025] A rectangular frame-shaped groove is formed on the bottom surface of the rectangular sleeve body, and a rectangular sealing strip is nested in the groove, with its bottom surface pressed against the top surface of the bottom plate of the middle filter tank body.

[0026] Vertical positioning through holes are formed at the four corners of the top surface of the bottom plate of the middle filter tank body where all the middle through holes are located. The protective filter cover is placed on the top surface of the bottom plate of the middle filter tank body and covers all the middle through holes. The protective filter cover is composed of two left and right oblique plates and two front and rear triangular plates. The upper ends of the two oblique plates are welded and fixed, and the inner side walls of the front and rear ends of the two oblique plates are welded and fixed to the left and right side walls of the corresponding triangular plates. The protective filter cover is in the rectangular sleeve part, and the bottom surfaces of the four corners of the protective filter cover are welded and fixed with positioning columns, which are inserted into the corresponding vertical positioning through holes. The protective filter cover is made of a filter mesh, and mesh holes are formed on its wall surface.

[0027] The beneficial effects of the present invention are:

[0028] It can keep the solid matter that falls from the vertical flow through holes of the sewage filter plate in the middle filter tank body, and will not fall into the drainage ditch tank body, so that the fallen solid matter is easy to take out, and can prevent the drainage ditch tank body from being blocked. In addition, when performing inspection and maintenance, the middle filter tank body can be moved to the left, so that the second filter tank body covers the sewage filter plate, so that when the material in the middle filter tank body is taken out and processed, the filtering effect can continue to be achieved through the second filter tank body, so that the external solid matter will not fall into the drainage ditch tank body, and the drainage ditch tank body is guaranteed to be in a normal dredging state;

[0029] Especially in heavy rain conditions, when the water in the drainage ditch body flows rapidly, the solid matter falling from the vertical straight through holes of the sewage filter plate will not be washed away, but will remain in the middle filter trough body for easy removal. When the middle filter trough body is repaired and maintained on the left side or the protective filter cover needs to be repaired and maintained, the second filter trough body covers the sewage filter plate, which also plays a protective effect, so that the solid matter falling from the vertical straight through holes of the sewage filter plate will not enter the drainage ditch body and be washed away, but will remain in the second filter trough body for easy removal. Description of the drawings:

[0030] Figure 1 It is a schematic diagram of the local structure of the present invention;

[0031] Figure 2 for Figure 1 a partial enlarged view of a portion;

[0032] Figure 3 It is a partial top view of the present invention;

[0033] Figure 4 It is a partial cross-sectional view of the present invention;

[0034] Figure 5 It is a partial cross-sectional view of the middle filter tank body of the present invention. Specific implementation method:

[0035] Example: See Figures 1 to 5 As shown, a sewage drainage structure includes a left-right extending installation groove 10 formed on the top surface of the ground, the middle bottom surface of the installation groove 10 corresponds to and communicates with a drainage groove body 20 that runs through the front and back below it, a slate layer 30 is laid on the ground, and the slate layer 30 covers the entire installation groove 10, and a central through groove 31 is formed on the slate layer 30 just above the middle of the installation groove 10, and a sewage filter plate 40 is placed in the slate layer 30 and covers the central through groove 31;

[0036] The front wall and the rear wall of the installation groove 10 are both formed with side installation grooves extending forward or backward, and the side connection blocks 11 extending left and right are nested in the corresponding side installation grooves, and the outer wall of the side connection block 11 is pressed against the inner wall of the corresponding side installation groove and fixedly connected;

[0037] A guide rail 12 extending left and right is fixed in the middle of the opposite wall surfaces of the two side connection blocks 11. The middle filter tank body 50 is located in the middle between the two side connection blocks 11. The middle filter tank body 50 is located directly below the sewage filter plate 40. All vertical flow through holes 41 on the sewage filter plate 40 face the top surface of the bottom plate of the middle filter tank body 50. Horizontal support plates 51 are fixed to the upper part of the outer side walls of the front and rear wall plates of the middle filter tank body 50. The horizontal support plates 51 are located directly above the corresponding guide rails 12.

[0038] The middle filter tank body 50 has a plurality of middle through holes 52 formed on the bottom plate.

[0039] Elastic limiting plates 1 are fixed on both left and right end surfaces of the installation groove 10 .

[0040] A second filter tank body 60 is disposed on the right side of the middle filter tank body 50 . Second horizontal support plates 61 are fixed to the upper outer walls of the front and rear wall plates of the second filter tank body 60 . The second horizontal support plates 61 are located above the two guide rails 12 .

[0041] Buffer springs 8 are fixed to the left and right parts of the bottom surfaces of the horizontal support plate 51 and the second horizontal support plate 61. The bottom ends of all buffer springs 8 of the same horizontal support plate 51 or the second horizontal support plate 61 are fixed to the same transverse movable plate 9, and a wear-resistant layer is fixed to the bottom surface of the transverse movable plate 9, which is pressed against the top surface of the corresponding guide rail 12.

[0042] At the same time, the top surfaces of the two guide rails 12 on the sides close to each other are formed with blocking bars 121 extending left and right. The two blocking bars 121 can prevent the transverse moving plate 9 from moving out of the corresponding guide rail 12 .

[0043] Furthermore, a right connecting block 620 is fixed on the right side wall of the right side plate of the second filter tank body 60, a vertical through hole 621 is formed in the middle of the right connecting block 620, and the right side wall of the right connecting plate 62 is pressed against the left side wall of the elastic limiting plate 1 on the right side.

[0044] A transverse connecting column 63 is fixed to the middle of the left side plate of the second filter tank body 60, and a radially extending annular body portion 631 is formed on the outer side wall of the left end of the transverse connecting column 63;

[0045] A connecting block 53 is fixed in the middle of the right side wall of the middle filter tank body 50, and a downwardly extending slot 531 is formed in the middle of the top surface of the connecting block 53. The right end of the slot 531 extends out of the right side wall of the connecting block 53, and an extended blocking portion 532 is formed on the inner side wall of the right end of the slot 531. The transverse connecting column 63 is inserted into the slot 531 and cooperates with the slot 531. The ring body 631 is located on the left side of the extended blocking portion 532 and corresponds to it.

[0046] This structure makes it easy to connect and disassemble the middle filter tank body 50 and the second filter tank body 60. It only requires inserting the transverse connecting column 63 into the slot 531. The ring body 631 is located on the left side of the extended blocking portion 532, and its right side wall faces the left side wall of the extended blocking portion 532, thereby preventing the extension blocking portion 532 from detaching from the transverse connecting column 63.

[0047] A left connecting block 54 is fixed on the left side wall of the left side plate of the middle filter tank body 50. A vertical through hole is formed in the middle of the left connecting block 54. The left side wall of the left connecting block 54 corresponds to the right side wall of the left elastic limiting plate 1.

[0048] A plurality of second through holes 65 are formed in the middle of the bottom plate of the second filter tank body 60, and a filter screen plate 66 is fixed on the top surface of the bottom plate of the second filter tank body 60 and covers all the second through holes 65. The filter screen plate 66 is formed with mesh holes. The water entering the second through holes 65 can be filtered through the filter screen plate 66.

[0049] Furthermore, a right inspection slot 32 is formed on the stone layer 30 at the right side of the sewage filter plate 40 , the right inspection slot 32 faces the second filter tank body 60 , and the right inspection plate 2 is installed on the stone layer 30 and covers the right inspection slot 32 .

[0050] A left maintenance slot 33 is formed on the stone slab layer 30 at the left side of the sewage filter plate 40 . The left maintenance slot 33 faces the left portion of the installation groove 10 . The left maintenance plate 3 is installed on the stone slab layer 30 and covers the left maintenance slot 33 .

[0051] The lower inner walls of the central through groove 31, the left inspection through groove 33 and the right inspection through groove 32 are all formed with rectangular frame-shaped horizontal radial extension edges extending along the corresponding four inner walls, and the top surfaces of the horizontal radial extension edges are formed with rectangular frame-shaped sealing grooves, and the rectangular sealing strips are nested in the sealing grooves. The bottom surfaces of the edges of the left inspection plate 3, the right inspection plate 2 and the sewage filter plate 40 are pressed against the top surfaces of the corresponding horizontal radial extension edges and against the top surfaces of the corresponding sealing strips.

[0052] The upper middle part of the front and rear inner walls of the left inspection slot 33 and the right inspection slot 32 is formed with a placement groove extending horizontally outward, and the middle part of the front and rear walls of the left inspection plate 3 and the right inspection plate 2 are both movably connected with a handle 4, which is in the corresponding placement groove, and its bottom surface is pressed against the bottom surface of the corresponding placement groove. This structure makes it possible to lift the left inspection plate 3 or the right inspection plate 2 by simply flipping up the corresponding handle 4 and holding the corresponding handle 4, so as to facilitate maintenance operations.

[0053] Furthermore, a rectangular sleeve portion 42 is fixed to the bottom surface of the sewage filter plate 40, and the rectangular sleeve portion 42 is inserted into the middle filter tank body 50, and its bottom end surface is pressed against the top surface of the bottom plate of the middle filter tank body 50, and all vertical flow through holes 41 are connected to the rectangular sleeve portion 42, and all the middle through holes 51 of the middle filter tank body 50 are connected to the rectangular sleeve portion 42;

[0054] A rectangular frame-shaped groove is formed on the bottom surface of the rectangular sleeve portion 42 , and a rectangular sealing strip is nested in the groove, with its bottom surface pressed against the top surface of the bottom plate of the middle filter tank body 50 .

[0055] Furthermore, vertical positioning through holes are formed at the four corners of the top surface of the bottom plate of the middle filter tank body 50 where all the middle through holes 52 are located. The protective filter cover 70 is placed on the top surface of the bottom plate of the middle filter tank body 50 and covers all the middle through holes 52. The protective filter cover 70 is composed of two left and right oblique plates and two front and rear triangular plates. The upper ends of the two oblique plates are welded and fixed, and the inner walls of the front and rear ends of the two oblique plates are welded and fixed to the left and right side walls of the corresponding triangular plates. The protective filter cover 70 is in the rectangular sleeve portion 42, and the bottom surfaces of the four corners of the protective filter cover 70 are welded and fixed with positioning columns 71, which are inserted into the corresponding vertical positioning through holes (elastic bands can be wrapped around the outer walls of the positioning columns 71 so that they can be stuck when inserted into the corresponding vertical positioning through holes to improve the fixing firmness). The protective filter cover 70 is made of a filter mesh with mesh holes formed on its wall surface.

[0056] Furthermore, the bottom surface of the middle filter tank body 50 is pressed against the corresponding top surface of the drainage ditch tank body 20 below, and elastic sealing strips 6 extending forward and backward are fixed to the left and right parts of the bottom surface of the middle filter tank body 50, and all the middle through holes 52 are located between the two elastic sealing strips 6, and the two elastic sealing strips 6 are located on the outer side walls of the left and right side plates of the drainage ditch tank body 20, and the inner side walls of the two elastic sealing strips 6 are closely attached to the upper outer side walls of the left and right side plates of the drainage ditch tank body 20. The two elastic sealing strips 6 are used to realize the positioning of the middle filter tank body 50 and the drainage ditch tank body 20.

[0057] Furthermore, two second elastic sealing strips 7 extending forward and backward are fixed to the left and right parts of the bottom plate of the second filter tank body 60, and all the second through holes 65 are located between the two second elastic sealing strips 7, and the two second elastic sealing strips 7 correspond to the corresponding positions of the left and right side plates of the drainage ditch tank body 20. The second filter tank body 60 and the drainage ditch tank body 20 are positioned by the two second elastic sealing strips 7.

[0058] Furthermore, the middle of the left part and the middle of the right part of the sewage filter plate 40 are formed with a grabbing through hole 49, and the two grabbing through holes 49 are connected to the rectangular sleeve part 42. This structure facilitates the hook body to extend into the grabbing through hole 49 to lift the sewage filter plate 40.

[0059] When this embodiment is in use, the middle filter tank body 50 is pressed down by the deadweight of the sewage filter plate 40 and the rectangular sleeve portion 42, so that the corresponding elastic sealing strip 6 is compressed. At this time, the bottom surface of the middle filter tank body 50 is pressed against the corresponding top surface of the drainage ditch tank body 20 below, and the two elastic sealing strips 6 are located on the outer side walls of the left and right side plates of the drainage ditch tank body 20. The inner side walls of the two elastic sealing strips 6 are tightly attached to the upper outer side walls of the left and right side plates of the drainage ditch tank body 20 to achieve positioning.

[0060] Then, the external sewage can flow from the vertical direct flow through hole 41 of the sewage filter plate 40 to the rectangular sleeve body 42, and then fall obliquely downward along the left and right oblique plates of the protective filter cover 70. In this process, large particles will be in the rectangular sleeve body 42 and the middle filter tank body 50. Due to the left and right oblique plates of the protective filter cover 70, it is not easy for solid matter to be placed on the top thereof, and the water can enter the interior of the protective filter cover 70 through the mesh of the protective filter cover 70, and then enter the drainage ditch tank body 20 below through the middle through hole 52, so that the solid matter dropped from the vertical direct flow through hole 41 can be in the middle filter tank body 50. It only needs to open the sewage filter plate 40 to take out the solid matter from the middle filter tank body 50, which is very convenient. If the local drop is relatively valuable items or coins, they can be taken out by opening the sewage filter plate 40, which is very convenient.

[0061] Furthermore, since solid matter does not fall into the drainage ditch body 20, it can be ensured that the drainage ditch body 20 will not be blocked, thereby achieving a normal unobstructed state.

[0062] In the normal use of this embodiment, it is generally necessary to clean it after a certain period of use. It is necessary to lift and remove the sewage filter plate 40, and then remove the solid matter in the middle filter tank body 50, which is very convenient.

[0063] When the protective filter cover 70 is seriously clogged or the middle filter tank body 50 needs maintenance, in order not to affect its filtering effect, the sewage filter plate 40 can be lifted and taken out, and the left inspection plate 3 can be opened. At this time, since there is no sewage filter plate 40 pressed and fixed, the middle filter tank body 50 is lifted by the elastic restoring force of the buffer spring 8, so that the two elastic sealing strips 6 are no longer on the left and right sides of the drainage ditch tank body 20. Then, the rod body is inserted into the slot 531 of the connecting block 53, and then pulled to the left until the left end of the connecting block 53 is pressed against the right side wall of the elastic limiting plate 1 on the left. At this time, the second filter tank body 60 is above the corresponding position of the drainage ditch tank body 20. At this time, the sewage filter plate 40 is installed to the original position. The corresponding buffer spring 8 is compressed, so that the bottom surface of the second filter tank body 60 is pressed against the corresponding top surface of the drainage ditch tank body 20 below, and the two second elastic sealing strips 7 are at the corresponding positions of the left and right side plates of the drainage ditch tank body 20. At this time, all the second through holes 65 are facing the drainage ditch tank body 20. At this time, the sewage is filtered through the second filter tank body 60, and at this time, the middle filter tank body 50 is facing the left maintenance groove 33. At this time, the middle filter tank body 50 can be repaired and maintained, or the protective filter cover 70 can be disassembled for repair and maintenance and cleaning to prevent the mesh from being blocked. At the same time, during processing, since the left inspection plate 3 is opened, there may be some solid matter in the left part of the installation groove 10. At this time, the inside can also be processed manually.

[0064] The right inspection plate 2 at the right inspection slot 32 is mainly used to handle the second filter tank body 60 when it needs to be repaired and maintained. Its operation method is the same as that of the middle filter tank body 50, except that it moves to the right. Therefore, it will not be described in detail.

[0065] Moreover, after the right inspection plate 2 is opened, the second filter tank body 60 can be taken out from the right inspection slot 32 in the right inspection slot 32. It is only necessary to lift the second filter tank body 60 upward to separate it from the middle filter tank body 50 to achieve disassembly, which is very convenient. During installation, the sewage filter plate 40 can be lifted and taken out so that the corresponding buffer spring 8 is not compressed. It is only necessary to put the second filter tank body 60 into the right inspection slot 32, and then insert the transverse connecting column 63 into the slot 531. The annular body 631 is on the left side of the extended blocking portion 532, and its right side wall faces the left side wall of the extended blocking portion 532, thereby preventing the extension blocking portion 532 from detaching from the transverse connecting column 63 to complete the installation.

[0066] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention should be defined by the claims.

Claims

1. A sewage drainage structure, comprising a mounting groove (10) formed on the top surface of the ground and extending left and right, wherein the middle bottom surface of the mounting groove (10) corresponds to and communicates with a drainage ditch body (20) extending front and back and provided below the mounting groove, and is characterized in that: A slate layer (30) is laid on the ground, the slate layer (30) covers the entire installation groove (10), a central through groove (31) is formed on the slate layer (30) just above the middle of the installation groove (10), and a sewage filter plate (40) is placed in the slate layer (30) and covers the central through groove (31); The front wall surface and the rear wall surface of the installation groove (10) are both formed with side installation grooves extending forward or backward, and the side connection blocks (11) extending left and right are nested in the corresponding side installation grooves, and the outer wall surface of the side connection block (11) is pressed against the inner wall of the corresponding side installation groove and fixedly connected; A guide rail (12) extending leftward and rightward is fixed in the middle of the opposite wall surfaces of the two side connection blocks (11); the middle filter tank body (50) is located in the middle between the two side connection blocks (11); the middle filter tank body (50) is located directly below the sewage filter plate (40); all vertical flow through holes (41) on the sewage filter plate (40) face the top surface of the bottom plate of the middle filter tank body (50); and horizontal support plates (51) are fixed to the upper parts of the outer side walls of the front and rear wall plates of the middle filter tank body (50); the horizontal support plates (51) are located directly above the corresponding guide rails (12); The bottom plate of the middle filtering tank body (50) is formed with a plurality of middle through holes (52).

2. A sewage drainage structure according to claim 1, characterized in that: Elastic limiting plates (1) are fixed on both left and right end surfaces of the installation groove (10).

3. A sewage drainage structure according to claim 2, characterized in that: A second filter tank body (60) is provided on the right side of the middle filter tank body (50), and second horizontal support plates (61) are fixed on the upper outer walls of the front and rear wall plates of the second filter tank body (60), and the second horizontal support plates (61) are located above the two guide rails (12).

4. A sewage drainage structure according to claim 3, characterized in that: A right connecting block (620) is fixed on the right side wall of the right side plate of the second filter tank body (60), a vertical through hole (621) is formed in the middle of the right connecting block (620), and the right side wall of the right connecting plate (62) is pressed against the left side wall of the elastic limiting plate (1) on the right side.

5. A sewage drainage structure according to claim 3, characterized in that: A transverse connecting column (63) is fixed to the middle of the left side plate of the second filter tank body (60), and a radially extending annular body portion (631) is formed on the outer side wall of the left end of the transverse connecting column (63); A connecting block (53) is fixed in the middle of the right side wall of the middle filter tank body (50); a slot (531) extending downward is formed in the middle of the top surface of the connecting block (53); the right end of the slot (531) extends out of the right side wall of the connecting block (53); an extending blocking portion (532) is formed on the inner side wall of the right end of the slot (531); a transverse connecting column (63) is inserted into the slot (531) and matched with the slot (531); and the annular body (631) is located on the left side of the extending blocking portion (532) and corresponds to it.

6. A sewage drainage structure according to claim 2, characterized in that: A left connecting block (54) is fixed on the left side wall of the left side plate of the middle filtering tank body (50), a vertical through hole is formed in the middle of the left connecting block (54), and the left side wall of the left connecting block (54) corresponds to the right side wall of the left elastic limiting plate (1).

7. A sewage drainage structure according to claim 3, characterized in that: A plurality of second through holes (65) are formed in the middle of the bottom plate of the second filter tank body (60), a filter screen plate (66) is fixed on the top surface of the bottom plate of the second filter tank body (60) and covers all the second through holes (65), and mesh holes are formed on the filter screen plate (66).

8. A sewage drainage structure according to claim 3, characterized in that: A right maintenance slot (32) is formed on the stone slab layer (30) at the right side of the sewage filter plate (40), the right maintenance slot (32) faces the second filter tank body (60), and the right maintenance plate (2) is installed on the stone slab layer (30) and covers the right maintenance slot (32).

9. A sewage drainage structure according to claim 1, characterized in that: A left inspection slot (33) is formed on the stone slab layer (30) at the left side of the sewage filter plate (40), the left inspection slot (33) faces the left part of the installation groove (10), and the left inspection plate (3) is installed on the stone slab layer (30) and covers the left inspection slot (33).

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