Prefabricated drainage inspection well

Abstract

The application provides an assembled drainage inspection well, and belongs to the technical field of inspection wells, which solves the technical problems of inconvenient assembly, inaccurate installation, inconvenient well cover fixing and post-maintenance of the existing assembled drainage inspection well.The assembled drainage inspection well comprises a well chamber and a well shaft fixedly installed above the well chamber, and the top end of the well chamber is fixedly installed with an upper convex pipe, and the top end of the upper convex pipe is fixedly inserted with the well shaft.In the application, the modular prefabrication and on-site rapid assembly of the inspection well are realized through the three-section assembly structure of the well chamber, the well shaft and the adjusting cover, the socket joint is adopted between the components, complex tools and wet operation are not needed, the on-site construction period is greatly shortened, the labor cost is reduced, meanwhile, the modular design is convenient for transportation and stacking, the industrialization level of engineering construction is improved, and through the setting of the telescopic adjusting assembly, a plurality of screw rods distributed in a ring shape at equal intervals are used as the guide and bearing structure.

Description

Technical Field

[0001] This invention belongs to the field of inspection well technology, and relates to a drainage inspection well, particularly a prefabricated drainage inspection well. Background Technology

[0002] Urban drainage is divided into rainwater and sewage, and drainage systems are divided into separate systems and combined systems. Most cities adopt a separate system, meaning rainwater and sewage are discharged separately. Units or residential areas along urban roads generally have organized drainage systems, collecting rainwater and sewage and discharging them into drainage pipes under the city roads, commonly known as municipal drainage pipes. Rainwater and sewage are then discharged into water bodies or sewage treatment plants through municipal drainage pipes. Inspection wells are required at regular intervals, at pipe bends, and at branch pipe connections within municipal drainage pipes.

[0003] A search revealed a prefabricated plastic circular municipal drainage inspection well disclosed in Chinese patent literature [Application No.: CN202210210315.3; Publication No.: CN114508164B]. This municipal drainage inspection well includes a base plate, a well chamber, an adjustable positioning frame structure, a pipe protection frame structure, a reinforced protection frame structure, a protective cover, a positioning groove, a positioning hole, a first lifting ring, a connector, a cylindrical pipe, a well opening, and an adjustable climbing frame structure. The well chamber is placed on the upper part of the base plate; adjustable positioning frame structures are installed on the left and right sides of the well chamber; a pipe protection frame structure is installed on the inner side of the adjustable positioning frame structure; a reinforced protection frame structure is placed on the upper part of the well chamber; and a protective cover is installed on the upper part of the reinforced protection frame structure.

[0004] Although the drainage inspection well disclosed in this patent achieves a certain range of adjustment during pipe connection through an adjustable positioning frame structure, and improves assembly convenience and structural strength to some extent through a reinforced protective frame structure, the pipe connection adjustment structure of this drainage inspection well is relatively complex and has limited adjustment accuracy. It is difficult to achieve precise alignment in multiple directions, and a lot of manual adjustment is still required during on-site construction, which affects installation efficiency. In addition, the position of the manhole cover is fixed and cannot be flexibly adjusted according to the actual paving conditions of the ground, such as curbs and tactile paving, which can easily cause the manhole cover to interfere with the surrounding environment, affecting the aesthetics of the road surface and traffic safety. Moreover, after long-term use, the bottom of the manhole chamber is prone to siltation, increasing maintenance difficulty. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a prefabricated drainage inspection well. The technical problem this invention aims to solve is: how to achieve efficient assembly of the inspection well, flexible adjustment of the well cover position, and optimized maintenance of the bottom.

[0006] The objective of this invention can be achieved through the following technical solutions: A prefabricated drainage inspection well includes a well chamber and a well cylinder fixedly installed above the well chamber. An upper protruding pipe is fixedly installed at the top of the well chamber, and the top of the upper protruding pipe is fixedly inserted into the well cylinder. An adjusting cover is fixedly attached to the top of the well cylinder. The outer wall of the well chamber has at least two drainage holes, and the outer wall of each drainage hole is equipped with a telescopic adjustment component; The telescopic adjustment assembly includes a fixed pipe, which is concentrically located on the outer wall of the drainage hole and fixedly installed on the outer wall of the well chamber. Multiple screws are fixedly connected to the surface of the fixed pipe, and the multiple screws are arranged in a ring at equal intervals. Each screw has an adjusting nut threaded onto its outer wall, and an mounting plate is fitted onto the outer wall of the adjusting nut. The mounting plate has a through hole that can accommodate the screw, and a locking nut is threaded onto the outer wall of the screw. The locking nut is located on the surface of the mounting plate. The rear end of the mounting plate is fixedly connected to a telescopic tube, and the other end of the telescopic tube is fixedly installed with a fixed tube. The bottom of the well chamber is integrally connected to a sludge collection cylinder, and the inside of the sludge collection cylinder is detachably connected to a sludge screen.

[0007] The working principle of this invention is as follows: During installation, the foundation pit is first excavated according to the design elevation and location. Since the bottom of the well chamber is equipped with an arc-shaped sewage collection cylinder, compared with the traditional square or flat-bottomed structure, its arc-shaped bottom surface can effectively reduce the excavation depth and earthwork volume of the foundation pit, reducing construction difficulty and cost. Then, after the well chamber is hoisted into place, the seat plate of the outer wall of the well chamber contacts the bottom of the foundation pit, providing a stable support platform to prevent the well chamber from settling or tilting during the backfilling process. When connecting the external drainage pipe, since the actual position of the drainage pipe on site may deviate from the design position, the fixing pipe is concentrically fixed with the drainage hole of the well chamber. Multiple screws are distributed in a ring at equal intervals. The construction personnel drive the installation plate to move smoothly along the screw axis by rotating the adjusting nut, thereby driving the telescopic pipe to extend and retract. The telescopic pipe is a flexible and expandable structure that can compensate for axial offset and a certain degree of angular deviation. After the front end of the telescopic pipe is precisely aligned with the external drainage pipe, the locking nut is tightened to lock the mounting plate onto the screw rod for angle fixation. The external drainage pipe is then fixed via the mounting plate, thus completing a high-precision pipe connection. Next, the manhole is installed. The lower insertion part at the bottom of the manhole is connected to the upper protruding pipe at the top of the manhole chamber using a plug-in method. This not only achieves rapid initial positioning but also allows for automatic centering under its own weight, ensuring the verticality of the manhole. When the total depth of the inspection well needs to be increased, multiple manholes can be connected sequentially in the same way, achieving flexible adjustment of the manhole height. Finally, the adjusting cover is installed, and the bottom protrusion of the adjusting cover... The ring engages with the annular recess at the top of the manhole to form a stable overlapping installation. The manhole ring is eccentrically positioned on the surface of the adjusting cover. Construction workers can adjust the horizontal position of the manhole ring by rotating the adjusting cover according to the actual ground conditions of the road paving and curb location, ensuring that the manhole cover avoids ground obstacles and is flush with the road surface, aesthetically pleasing, and does not obstruct traffic after installation. During routine maintenance, maintenance personnel only need to open the manhole cover at the top of the manhole ring to enter the manhole chamber, place the sludge screen in the sludge collection cylinder on the wedge-shaped baffle through the overlapping part, and the maintenance personnel can easily remove the sludge screen to clean the deposited mud, sand, and debris, preventing them from entering the downstream drainage pipe and causing blockage. After cleaning, the sludge screen is returned to its original position, completing the maintenance work.

[0008] The bottom end of the well shaft is integrally connected to a lower insertion part, which is inserted into the upper end of the upper protruding pipe. The top of the well shaft is provided with an annular recess, and an adjustment cover is fixedly attached to the surface of the annular recess.

[0009] With the above structure, the insertion of the lower part and the upper protruding tube enables rapid positioning and stable connection between the well barrel and the well chamber, ensuring verticality and concentricity, and improving on-site assembly efficiency. At the same time, the annular concave platform provides a stable support plane for the adjustment cover, ensuring the flatness and load-bearing capacity of the adjustment cover after installation.

[0010] The bottom end of the adjusting cover has a convex ring corresponding to the annular concave platform, and a well ring is integrally connected to the surface of the adjusting cover, and the well ring is eccentrically positioned on the surface of the adjusting cover.

[0011] The above structure, with its convex ring and annular concave platform, achieves a stable overlapping structure, preventing the adjustment cover from shifting horizontally during use. Furthermore, the eccentric setting of the manhole ring allows construction workers to change the horizontal position of the manhole ring by rotating the adjustment cover, thereby flexibly avoiding obstacles such as curbs and tactile paving on the road surface and ensuring that the manhole cover is consistent with the ground paving after installation.

[0012] A wedge-shaped baffle is fixedly installed on the inner wall of the bottom end of the well chamber, and the wedge-shaped baffle is located above the sludge collection cylinder; The surface of the wedge-shaped baffle is fixedly overlapped with a dirt-blocking screen, and the two sides of the dirt-blocking screen are respectively provided with overlapping parts about the wedge-shaped baffle, and the dirt-blocking screen is arranged in an arc-shaped structure.

[0013] With the above structure, the arc-shaped structure of the sludge screen is adapted to the arc-shaped bottom of the sludge collection cylinder, which increases the filtration area and improves the sludge interception capacity. At the same time, the overlapping part and the wedge-shaped baffle make the sludge screen quick to disassemble and assemble without tools, which greatly facilitates the later cleaning and maintenance work.

[0014] A base plate is fixedly installed on the bottom outer wall of the well chamber, and the base plate is located above the sludge collection cylinder, and the bottom of the sludge collection cylinder is set in an arc shape.

[0015] By adopting the above structure, the arc-shaped bottom structure of the sludge collection cylinder not only reduces the excavation depth of the foundation pit and lowers the construction difficulty, but also the arc-shaped bottom surface has a good flow guiding effect, which can concentrate the sediment at the bottom of the cylinder, making it easier for the sludge screen to intercept and clean it, while also reducing the adhesion of sludge on the cylinder wall.

[0016] A sealing ring is provided between the fixed pipe and the drainage hole of the well chamber.

[0017] With the above structure, the sealing ring forms a reliable sealing interface between the fixed pipe and the drainage hole of the well chamber, effectively preventing groundwater or external mud and sand from seeping into the well chamber from the connection gap, thus ensuring the overall sealing performance and service life of the inspection well.

[0018] The well chamber, well shaft, and regulating cover are all precast concrete or plastic components. The bottom of the seat plate is provided with anti-slip protrusions or anti-slip textures.

[0019] By adopting the above structure, the mass production of each component is achieved by using precast concrete or plastic components, ensuring dimensional accuracy and structural strength, facilitating transportation and rapid on-site assembly. At the same time, the anti-slip protrusions or anti-slip textures on the bottom of the seat plate increase the friction coefficient between the seat plate and the foundation, preventing horizontal slippage of the well chamber during backfilling or use, and further enhancing the stability of the overall structure.

[0020] The telescopic tube is a corrugated tube or a rubber telescopic tube.

[0021] With the above structure, the corrugated pipe or rubber expansion joint has good axial expansion and contraction capacity and a certain angle compensation capacity, which can absorb the installation deviation between the external drainage pipe and the fixed pipe and the uneven settlement generated during use, ensuring the sealing and long-term reliability of the pipe connection node.

[0022] Compared with the prior art, the prefabricated drainage inspection well of the present invention has the following advantages: 1. In this invention, a three-section assembly structure consisting of a manhole, a manhole shaft, and an adjusting cover is adopted, enabling modular prefabrication and rapid on-site assembly of the inspection well. The components are connected by a socket joint, eliminating the need for complex tools and wet work, significantly shortening the on-site construction cycle and reducing labor costs. At the same time, the modular design facilitates transportation and stacking, improving the industrialization level of engineering construction. Furthermore, by setting up a telescopic adjustment component, multiple equally spaced screws are used as guide and load-bearing structures, along with adjusting nuts and locking nuts, precise axial adjustment of the mounting plate and telescopic pipe is achieved. This effectively compensates for installation deviations of external drainage pipes, avoids additional stress at pipe connections, and has good load-bearing capacity and locking reliability, ensuring the sealing and stability of the connection nodes during long-term use.

[0023] 2. In this invention, by setting the manhole ring eccentrically on the adjusting cover, the horizontal position of the manhole cover can be flexibly adjusted within a certain range by rotating the adjusting cover. This effectively solves the problem that the traditional manhole cover has a fixed position and is difficult to adapt to obstacles on the ground, such as curbs, tactile paving, and paving gaps. It improves the manhole's adaptability to complex road environments and ensures the integrity and aesthetics of the road paving.

[0024] 3. In this invention, by integrally connecting an arc-shaped sludge collection cylinder to the bottom of the well chamber, the arc-shaped structure has good stress performance and can reduce the excavation depth of the foundation pit and the amount of backfill soil, thereby reducing construction difficulty and engineering costs. At the same time, by setting a detachable sludge screen inside the sludge collection cylinder, it can effectively intercept and deposit mud, sand and debris in the water flow, preventing downstream pipe blockage. Furthermore, the sludge screen is installed in an overlapping manner, which is convenient for regular removal and cleaning, reducing the later operation and maintenance costs. Meanwhile, the setting of the seat plate increases the contact area between the bottom of the well chamber and the foundation, enhancing the overall structure's anti-settlement ability and installation stability. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of a prefabricated drainage inspection well according to the present invention; Figure 2 This is a side view of a prefabricated drainage inspection well according to the present invention; Figure 3 This is a cross-sectional structural schematic diagram of a prefabricated drainage inspection well according to the present invention; Figure 4 This is an exploded structural diagram of a prefabricated drainage inspection well according to the present invention; Figure 5 This is a schematic diagram of the telescopic adjustment component in this invention; Figure 6 This is a schematic diagram of the exploded structure of the well chamber and well casing in this invention; Figure 7 This is a schematic diagram of the bottom structure of a prefabricated drainage inspection well according to the present invention; Figure 8 This is a schematic cross-sectional view of the sludge collection cylinder and the sludge screen in this invention. Figure 9 This is a schematic diagram of the structure of the dirt-separating screen in this invention.

[0026] In the diagram, 1 is the well chamber; 2 is the well shaft; 21 is the lower insertion part; 22 is the concave platform; 3 is the adjusting cover; 31 is the well ring; 32 is the convex ring; 4 is the upper convex pipe; 5 is the seat plate; 6 is the sludge collection cylinder; 7 is the wedge-shaped baffle; 8 is the sludge screen; 81 is the overlapping part; 9 is the fixing pipe; 10 is the screw; 11 is the adjusting nut; 12 is the mounting plate; 13 is the locking nut; and 14 is the telescopic pipe. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figures 1-9As shown, a prefabricated drainage inspection well includes a well chamber 1, a well cylinder 2 fixedly installed above the well chamber 1, a lower insertion part 21, a recessed platform 22, an adjusting cover 3, a well ring 31, a convex ring 32, an upper convex pipe 4, a seat plate 5, a sludge collection cylinder 6, a wedge-shaped baffle 7, a sludge screen 8, an overlapping part 81, a fixing pipe 9, a screw 10, an adjusting nut 11, a mounting plate 12, a locking nut 13, and a telescopic pipe 14. The well chamber 1, the well cylinder 2, and the adjusting cover 3 are all precast concrete or plastic components. By using precast concrete or plastic components, mass production of each component is achieved, ensuring dimensional accuracy and structural strength, facilitating transportation and rapid on-site assembly. The upper convex pipe 4 is fixedly installed at the top of the well chamber 1, and the well cylinder 2 is fixedly inserted into the top of the upper convex pipe 4. The adjusting cover 3 is fixedly overlapped at the top of the well cylinder 2. Specifically, the lower insertion part 21 is integrally connected to the bottom end of the well cylinder 2, and the lower insertion part 21 is inserted into... At the upper end of the upper convex pipe 4, the insertion of the lower insertion part 21 into the upper convex pipe 4 enables rapid positioning and stable connection between the manhole 2 and the manhole chamber 1, ensuring verticality and concentricity, and improving on-site assembly efficiency. The top of the manhole 2 is provided with an annular recess 22, and an adjustment cover 3 is fixedly attached to the surface of the annular recess 22. The bottom of the adjustment cover 3 is provided with a convex ring 32 corresponding to the annular recess 22. The cooperation between the convex ring 32 and the annular recess 22 achieves a stable overlapping structure, preventing the adjustment cover 3 from shifting horizontally during use. A manhole ring 31 is integrally connected to the surface of the adjustment cover 3, and the manhole ring 31 is eccentrically positioned on the surface of the adjustment cover 3. The eccentric setting of the manhole ring 31 allows construction personnel to change the horizontal position of the manhole ring 31 by rotating the adjustment cover 3, thereby flexibly avoiding obstacles such as curbs and tactile paving on the road surface, ensuring that the manhole cover is consistent with the ground paving after installation. At least two drainage holes are provided on the outer wall of well chamber 1, and each drainage hole is equipped with a telescopic adjustment component on its outer wall. The telescopic adjustment assembly includes a fixed pipe 9, which is concentrically located on the outer wall of the drainage hole and is fixedly installed on the outer wall of the well chamber 1. A sealing ring is provided between the fixed pipe 9 and the drainage hole of the well chamber 1. The sealing ring forms a reliable sealing interface between the fixed pipe 9 and the drainage hole of the well chamber 1, effectively preventing groundwater or external mud and sand from seeping into the interior of the well chamber 1 from the connection gap, thus ensuring the overall sealing performance and service life of the inspection well. Multiple screws 10 are fixedly connected to the surface of the fixed pipe 9, and the multiple screws 10 are arranged in a ring at equal intervals. Each screw 10 has an adjusting nut 11 threadedly connected to its outer wall, and an mounting plate 12 is fitted to the outer wall of the adjusting nut 11. The mounting plate 12 has a through hole that can accommodate the screw 10, and a locking nut 13 is threadedly connected to the outer wall of the screw 10. The locking nut 13 is located on the surface of the mounting plate 12. At the same time, a telescopic pipe 14 is fixedly connected to the rear end of the mounting plate 12, and a fixed pipe 9 is fixedly installed at the other end of the telescopic pipe 14. The telescopic pipe 14 is a corrugated pipe or a rubber telescopic pipe 14. The corrugated pipe or rubber telescopic pipe 14 has good axial expansion and contraction capacity and a certain angle compensation capacity, which can absorb the installation deviation between the external drainage pipe and the fixed pipe 9 and the uneven settlement generated during use, ensuring the sealing and long-term reliability of the pipe connection node. Furthermore, a sludge collection cylinder 6 is integrally connected to the bottom of the well chamber 1, and a sludge-blocking screen 8 is detachably connected inside the sludge collection cylinder 6. Specifically, a wedge-shaped baffle 7 is fixedly installed on the inner wall of the bottom of the well chamber 1, and the wedge-shaped baffle 7 is located above the sludge collection cylinder 6. The sludge-blocking screen 8 is fixedly overlapped on the surface of the wedge-shaped baffle 7, and overlapping parts 81 are provided on both sides of the sludge-blocking screen 8 corresponding to the wedge-shaped baffle 7. The sludge-blocking screen 8 is arranged in an arc-shaped structure, and the arc-shaped structure of the sludge-blocking screen 8 is adapted to the arc-shaped bottom of the sludge collection cylinder 6, which increases the filtration area and improves the interception capacity. At the same time, the overlapping parts 81 and the wedge-shaped baffle 7 allow the sludge-blocking screen 8 to be quickly disassembled and assembled without tools, which greatly facilitates the subsequent cleaning and maintenance work. Furthermore, a seat plate 5 is fixedly installed on the bottom outer wall of the well chamber 1, and the seat plate 5 is located above the sludge collection cylinder 6. The bottom of the seat plate 5 is provided with anti-slip protrusions or anti-slip textures. The anti-slip protrusions or anti-slip textures on the bottom of the seat plate 5 increase the friction coefficient between the seat plate 5 and the foundation, preventing the well chamber 1 from sliding horizontally during backfilling or use, and further enhancing the stability of the overall structure. In addition, the bottom of the sludge collection cylinder 6 is set with an arc-shaped structure. The arc-shaped bottom structure of the sludge collection cylinder 6 not only reduces the excavation depth of the foundation pit and reduces the construction difficulty, but also the arc-shaped bottom surface has a good flow guiding effect, which can concentrate the sediment at the bottom of the cylinder, making it easier for the sludge screen 8 to intercept and clean it, and also reducing the adhesion of dirt on the cylinder wall.

[0029] Working principle: During installation, the foundation pit is first excavated according to the design elevation and location. Since the bottom of the well chamber 1 is equipped with an arc-shaped sewage collection cylinder 6, compared with the traditional square or flat bottom structure, its arc-shaped bottom surface can effectively reduce the excavation depth and earthwork volume of the foundation pit, reducing construction difficulty and cost. Then, after the well chamber 1 is hoisted into place, the seat plate 5 of the outer wall of the well chamber 1 contacts the bottom of the foundation pit, providing a stable support platform to prevent the well chamber 1 from settling or tilting during the backfilling process. When connecting the external drainage pipe, since the actual position of the drainage pipe on site may deviate from the design position, the fixing pipe 9 is fixed concentrically with the drainage hole of the well chamber 1. Multiple screws 10 are distributed in a ring at equal intervals. The construction personnel drive the installation plate 12 to move smoothly along the axis of the screws 10 by rotating the adjusting nut 11, thereby driving the telescopic pipe 14 to extend and retract. The telescopic pipe 14 is a flexible and telescopic structure that can compensate for axial offset and a certain angular deviation. After the front end of the telescopic pipe 14 is precisely connected to the external drainage pipe, the locking nut 13 is tightened to lock the mounting plate 12 onto the screw 10 for angle fixation. The external drainage pipe is then fixed through the mounting plate 12, thus completing the high-precision pipe connection. Next, the manhole 2 is installed. The lower insertion part 21 at the bottom of the manhole 2 is connected to the upper protruding pipe 4 at the top of the manhole chamber 1 using a plug-in method. This not only achieves rapid initial positioning but also allows for automatic centering under its own weight, ensuring the verticality of the manhole 2. When the total depth of the inspection well needs to be increased, multiple manholes 2 can be connected sequentially in the same way, achieving flexible adjustment of the manhole height. Finally, the adjusting cover 3 is installed. The adjusting cover 3 is connected to the top of the manhole 2 via the protruding ring 32 at the bottom. The annular recess 22 fits together to form a stable overlapping installation. The manhole ring 31 is eccentrically set on the surface of the adjusting cover 3. Construction personnel can change the horizontal position of the manhole ring 31 by rotating the adjusting cover 3 according to the actual ground conditions of the road paving and curb position, so that the manhole cover can avoid ground obstacles and ensure that the manhole cover is flush with the road surface after installation, aesthetically pleasing and does not affect traffic. During routine maintenance, maintenance personnel only need to open the manhole cover on the top of the manhole ring 31 to enter the manhole chamber 1, and place the sludge screen 8 in the sludge collection cylinder 6 on the wedge-shaped baffle 7 through the overlapping part 81. Maintenance personnel can easily remove the sludge screen 8, clean up the deposited mud, sand and debris, and prevent them from entering the downstream drainage pipe and causing blockage. After cleaning, the sludge screen 8 is put back in its original position to complete the maintenance work. This completes the working principle of the prefabricated drainage inspection well.

[0030] In summary, this invention achieves modular prefabrication and rapid on-site assembly of inspection wells by adopting a three-section assembly structure consisting of well chamber 1, well shaft 2, and adjusting cover 3. The components are connected by a socket joint, eliminating the need for complex tools and wet work, significantly shortening the on-site construction cycle and reducing labor costs. Simultaneously, the modular design facilitates transportation and stacking, improving the industrialization level of engineering construction. Furthermore, by setting up a telescopic adjustment component, using multiple equally spaced annular screws 10 as guides and load-bearing structures, and cooperating with adjusting nuts 11 and locking nuts 13, precise axial adjustment of the mounting plate 12 and telescopic pipe 14 is achieved. This effectively compensates for installation deviations in external drainage pipes, avoids additional stress at pipe connections, and possesses good load-bearing capacity and locking reliability, ensuring the sealing and stability of the connection nodes during long-term use. This solves the technical problems of inconvenient assembly, inaccurate installation, and inconvenient cover fixing and subsequent maintenance in existing prefabricated drainage inspection wells.

[0031] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A prefabricated drainage inspection well, comprising a well chamber (1) and a well shaft (2) fixedly installed above the well chamber (1), characterized in that, The top of the well chamber (1) is fixedly installed with an upper protruding pipe (4), and the top of the upper protruding pipe (4) is fixedly inserted with a well cylinder (2), and the top of the well cylinder (2) is fixedly overlapped with an adjusting cover (3). The outer wall of the well chamber (1) has at least two drainage holes, and the outer wall of each drainage hole is equipped with a telescopic adjustment component; The telescopic adjustment assembly includes a fixed pipe (9), which is concentrically located on the outer wall of the drainage hole and is fixedly installed on the outer wall of the well chamber (1). Multiple screws (10) are fixedly connected to the surface of the fixed pipe (9), and the multiple screws (10) are arranged in a ring at equal intervals. Each screw (10) has an adjusting nut (11) threadedly connected to its outer wall, and an mounting plate (12) is fitted to the outer wall of the adjusting nut (11). The mounting plate (12) has a through hole that can accommodate the screw (10), and a locking nut (13) is threadedly connected to the outer wall of the screw (10). The locking nut (13) is located on the surface of the mounting plate (12). The rear end of the mounting plate (12) is fixedly connected to a telescopic tube (14), and the other end of the telescopic tube (14) is fixedly installed with a fixing tube (9). The bottom of the well chamber (1) is integrally connected to a sludge collection cylinder (6), and the inside of the sludge collection cylinder (6) is detachably connected to a sludge screen (8).

2. The prefabricated drainage inspection well according to claim 1, characterized in that, The bottom end of the well shaft (2) is integrally connected to a lower insertion part (21), and the lower insertion part (21) is inserted into the upper end of the upper protruding pipe (4); The top of the well shaft (2) is provided with an annular recess (22), and an adjustment cover (3) is fixedly attached to the surface of the annular recess (22).

3. A prefabricated drainage inspection well according to claim 2, characterized in that, The bottom end of the adjustment cover (3) is provided with a protruding ring (32) corresponding to the annular concave platform (22), and a well ring (31) is integrally connected to the surface of the adjustment cover (3), and the well ring (31) is eccentrically located on the surface of the adjustment cover (3).

4. A prefabricated drainage inspection well according to claim 1, characterized in that, A wedge-shaped baffle (7) is fixedly installed on the inner wall of the bottom end of the well chamber (1), and the wedge-shaped baffle (7) is located above the sludge collection cylinder (6); The surface of the wedge baffle (7) is fixedly overlapped with a dirt screen (8), and the two sides of the dirt screen (8) are respectively provided with overlapping parts (81) about the wedge baffle (7), and the dirt screen (8) is arranged in an arc-shaped structure.

5. A prefabricated drainage inspection well according to claim 1, characterized in that, A seat plate (5) is fixedly installed on the bottom outer wall of the well chamber (1), and the seat plate (5) is located above the sludge collection cylinder (6), and the bottom of the sludge collection cylinder (6) is set in an arc-shaped structure.

6. A prefabricated drainage inspection well according to claim 1, characterized in that, A sealing ring is provided between the fixed pipe (9) and the drainage hole of the well chamber (1).

7. A prefabricated drainage inspection well according to claim 1, characterized in that, The well chamber (1), well shaft (2) and regulating cover (3) are all precast concrete or plastic components; The bottom of the seat plate (5) is provided with anti-slip protrusions or anti-slip textures.

8. A prefabricated drainage inspection well according to claim 1, characterized in that, The telescopic tube (14) is a corrugated tube or a rubber telescopic tube.

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