Nodular cast iron well lid based on adjustable construction height and construction method

Abstract

The invention discloses a nodular cast iron well lid based on adjustable construction height and a construction method.The nodular cast iron well lid comprises a well ring base, the well ring base is arranged on a construction roadbed, a lower well ring is arranged on the well ring base, and an upper well ring and the lower well ring are connected through a height fine adjustment assembly; according to the nodular cast iron well lid, the well ring base is in threaded connection with the lower well ring, the upper well ring and the lower well ring are connected through the height fine adjustment assembly, height coarse adjustment and fine adjustment operation is adopted, the height of the nodular cast iron well lid in the construction and installation process is conveniently adjusted, and the well lid is convenient to use. The construction and installation requirements of different roadbed well lids are met, the roadbed surface does not need to be adjusted many times, and the installation efficiency and convenience of the nodular cast iron well lids are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ductile iron manhole covers, and particularly relates to a ductile iron manhole cover with adjustable construction height and a construction method thereof. Background Art

[0002] Ductile iron is a cast iron material in which carbon in pig iron is converted into spherical graphite through high-temperature smelting. It has high strength, high toughness and impact resistance. Ductile iron manhole covers are municipal facility accessories made of ductile iron materials, mainly used for covering manholes in areas such as urban roads, sidewalks, and green belts, and have functions such as safety protection, load-bearing and environmental beautification.

[0003] The existing ductile iron manhole covers and manhole rings are fixedly connected. During the construction and installation process, height adjustment cannot be performed, and the roadbed surface needs to be trimmed accordingly, reducing the installation efficiency and convenience of ductile iron manhole covers. For this reason, we propose a ductile iron manhole cover with adjustable construction height and a construction method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a ductile iron manhole cover with adjustable construction height and a construction method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: A ductile iron manhole cover with adjustable construction height, comprising: A manhole ring base, which is arranged on the construction roadbed; A lower manhole ring, which is adjustably arranged on the manhole ring base; An upper manhole ring, which is connected to the lower manhole ring through a height fine-tuning component; A cover, which is snap-fitted on the upper manhole ring; A manhole cover body, which is arranged on the cover.

[0006] Preferably, the manhole ring base includes an outward-expanded ring plate and an externally threaded ring cylinder; The externally threaded ring cylinder is arranged on the outward-expanded ring plate, and the outer diameter of the outward-expanded ring plate is greater than the outer diameter of the externally threaded ring cylinder.

[0007] Preferably, the bottom of the outward-expanded ring plate is provided with contact bumps distributed in a ring shape.

[0008] Preferably, an internally threaded ring groove is opened inside the lower part of the lower manhole ring, and the lower manhole ring is threadedly connected to the externally threaded ring cylinder through the internally threaded ring groove.

[0009] Preferably, the height fine-tuning component includes a threaded sleeve, a bolt positioning and rotating seat, and a fine-tuning bolt; A number of the threaded sleeves are provided, and the number of the threaded sleeves are annularly distributed on the upper outer periphery of the lower well ring; A number of the bolt positioning and rotating seats are provided, and the number of the bolt positioning and rotating seats are annularly distributed on the upper outer periphery of the upper well ring, and the number of the threaded sleeves and the number of the bolt positioning and rotating seats are aligned and distributed; A number of the fine-tuning bolts are provided, the ends of the number of the fine-tuning bolts are positioned and rotatably arranged in the bolt positioning and rotating seats, and the threaded rod sections of the fine-tuning bolts are threadedly connected in the threaded sleeves.

[0010] Preferably, a first guiding tooth groove distributed in a ring shape is formed on the inner side of the lower well ring, a second guiding tooth groove distributed in a ring shape is formed on the outer side of the upper well ring, and the first guiding tooth groove and the second guiding tooth groove are adapted to each other; And the lower well ring and the upper well ring are guided and inserted through the first guiding tooth groove and the second guiding tooth groove.

[0011] Preferably, a clamping ring groove is formed at the upper end of the upper well ring, a clamping ring adapted to the clamping ring groove is arranged at the bottom end of the cover, and the cover is clamped on the upper well ring through the clamping ring and the clamping ring groove; A limiting arc-shaped plate is arranged at the bottom end of the cover corresponding to the outer periphery of the upper well ring at a position between adjacent bolt positioning and rotating seats, and the limiting arc-shaped plate is aligned and clamped between adjacent bolt positioning and rotating seats.

[0012] Preferably, a bolt end groove is formed at the bottom of the cover corresponding to the end of the fine-tuning bolt, and the bolt end groove is clamped at the end of the fine-tuning bolt.

[0013] Preferably, a well cover bearing ring is arranged on the inner side of the upper part of the upper well ring, the well cover body is arranged on the well cover bearing ring and is located inside the cover, and the upper end surface of the well cover body is flush with the upper end surface of the cover; Radial reinforcing ribs distributed in a ring shape are arranged on the well cover body, and reinforcing rings with gradually increasing sizes are arranged between the radial reinforcing ribs distributed in a ring shape.

[0014] A construction method of a ductile iron manhole cover with adjustable construction height includes the following steps: A. Subgrade pretreatment: At the position of the sewage pipeline opening, a construction pit for the ductile iron manhole cover is excavated according to the construction requirements, and the bottom of the pit is trimmed to ensure that the flatness error of the bottom of the pit ≤ 2 mm / m²; B. Construction height adjustment: B1. Coarse height adjustment: Align the outer expansion ring plate of the well ring base with the sewer pipe opening and place it into the construction pit of the ductile iron manhole cover. Then, perform horizontal adjustment using a laser level so that the contact bumps at the bottom of the outer expansion ring plate are in close contact with the construction pit of the ductile iron manhole cover. Next, thread the lower well ring onto the external thread ring cylinder through the internal thread ring groove, and according to the height of the roadbed horizontal plane and stress requirements, rotate the lower well ring in a threaded manner to make the height of the lower well ring meet the requirements, and perform horizontal adjustment again using a laser level; B2. Fine height adjustment: Insert the upper well rings into the lower well ring through guiding and plugging via the first guiding tooth groove and the second guiding tooth groove. Thread the threaded rod section of the fine adjustment bolt into the threaded sleeve, and according to the height of the roadbed horizontal plane and stress requirements, rotate the fine adjustment bolt to make the height of the upper well ring meet the requirements, and perform horizontal adjustment again using a laser level; C. Manhole cover installation: Align the clamping ring with the clamping ring groove, align the limiting arc-shaped plate between adjacent bolt positioning rotating seats, and align the bolt end groove with the end of the fine adjustment bolt. Then, align and snap the cover onto the upper well ring, place the manhole cover body on the manhole cover bearing ring, and make the upper end surfaces of the manhole cover body and the cover flush with the roadbed horizontal plane. The construction and installation of the ductile iron manhole cover are completed.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention is provided with a threaded connection between the well ring base and the lower well ring, and a height fine adjustment component is used to connect the upper well ring and the lower well ring. By adopting height rough adjustment and fine adjustment operations, it is convenient to adjust the height of the ductile iron manhole cover during construction and installation, meet the construction and installation requirements of manhole covers for different roadbeds, and do not require multiple adjustments to the roadbed surface, greatly improving the installation efficiency and convenience of the ductile iron manhole cover; 2. In the present invention, the lower well ring is threadedly connected to the external thread ring cylinder on the well ring base through the internal thread ring groove, which can roughly adjust the construction height of the ductile iron manhole cover, facilitate adjustment and installation according to the roadbed surface of the ductile iron manhole cover, and improve the convenience and installation efficiency of height adjustment of the ductile iron manhole cover; 3. In the present invention, a height fine adjustment component is used to connect the upper well ring and the lower well ring. During construction and installation, insert the upper well rings into the lower well ring through guiding and plugging via the first guiding tooth groove and the second guiding tooth groove, thread the threaded rod section of the fine adjustment bolt into the threaded sleeve, and according to the height of the roadbed horizontal plane and stress requirements, rotate the fine adjustment bolt to make the height of the upper well ring meet the requirements, further improving the convenience and installation efficiency of height adjustment of the ductile iron manhole cover; 4. The present invention is provided with a cover, and by aligning the clamping ring with the clamping ring groove, aligning the limiting arc-shaped plate between adjacent bolt positioning rotating seats, and aligning the bolt end groove with the end of the fine adjustment bolt, the cover is aligned and snapped onto the upper well ring, improving the clamping and positioning accuracy of the cover and ensuring the horizontal consistency of the cover with the roadbed surface; 5. The manhole cover body of the present invention is provided with radially distributed reinforcing ribs arranged in a ring shape, and reinforcing rings that increase in sequence are arranged between the radially distributed reinforcing ribs arranged in a ring shape, so as to improve the structural strength and load-bearing performance of the manhole cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic three-dimensional structure diagram of the whole of the present invention; Figure 2 is a schematic three-dimensional structure diagram of the whole of the present invention; Figure 3 is a schematic front sectional structure diagram of the present invention; Figure 4 is a schematic partial three-dimensional structure diagram of the present invention; Figure 5 is a schematic three-dimensional structure diagram of the manhole ring base of the present invention; Figure 6 is a schematic three-dimensional structure diagram of the manhole ring base of the present invention; Figure 7 is a schematic three-dimensional structure diagram of the lower manhole ring of the present invention; Figure 8 is a schematic three-dimensional structure diagram of the lower manhole ring of the present invention; Figure 9 is a schematic three-dimensional structure diagram of the upper manhole ring of the present invention; Figure 10 is a schematic three-dimensional structure diagram of the upper manhole ring of the present invention; Figure 11 is a schematic three-dimensional structure diagram of the cover of the present invention; Figure 12 is a schematic three-dimensional structure diagram of the manhole cover body of the present invention.

[0017] In the figure: 1. Manhole ring base; 101. Outer expanding ring plate; 102. Outer threaded ring cylinder; 103. Contact bump; 2. Lower manhole ring; 201. Inner threaded ring groove; 202. First guiding tooth groove; 3. Upper manhole ring; 301. Second guiding tooth groove; 302. Clamping ring groove; 303. Manhole cover bearing ring; 4. Height fine-tuning assembly; 401. Threaded sleeve; 402. Bolt positioning rotating seat; 403. Fine-tuning bolt; 5. Cover; 501. Clamping ring; 502. Limiting arc plate; 503. Bolt end groove; 6. Manhole cover body; 601. Radially distributed reinforcing rib; 602. Reinforcing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-12 , the ductile iron manhole cover provided by the present invention based on adjustable construction height includes: A manhole cover base 1, which is arranged on the construction roadbed. The manhole cover base 1 includes an outward-expanded ring plate 101 and an external-threaded ring cylinder 102; the external-threaded ring cylinder 102 is arranged on the outward-expanded ring plate 101, and the outer diameter of the outward-expanded ring plate 101 is greater than the outer diameter of the external-threaded ring cylinder 102. The bottom of the outward-expanded ring plate 101 is provided with contact bumps 103 distributed in a ring shape; A lower manhole cover 2, which is adjustably arranged on the manhole cover base 1. An internal-threaded ring groove 201 is opened in the lower part of the lower manhole cover 2, and the lower manhole cover 2 is threadedly connected to the external-threaded ring cylinder 102 through the internal-threaded ring groove 201; In the present invention, the lower manhole cover 2 is threadedly connected to the external-threaded ring cylinder 102 on the manhole cover base 1 through the internal-threaded ring groove 201, which can roughly adjust the construction height of the ductile iron manhole cover, facilitate adjustment and installation according to the roadbed surface of the ductile iron manhole cover, and improve the height adjustment convenience and installation efficiency of the ductile iron manhole cover; An upper manhole cover 3, which is connected to the lower manhole cover 2 through a height fine-tuning component 4. The height fine-tuning component 4 includes a threaded sleeve 401, a bolt positioning rotating seat 402 and a fine-tuning bolt 403; several threaded sleeves 401 are provided, and several threaded sleeves 401 are distributed in a ring shape on the outer periphery of the upper part of the lower manhole cover 2; several bolt positioning rotating seats 402 are provided, and several bolt positioning rotating seats 402 are distributed in a ring shape on the outer periphery of the upper part of the upper manhole cover 3, and several threaded sleeves 401 and several bolt positioning rotating seats 402 are aligned and distributed; several fine-tuning bolts 403 are provided, the ends of several fine-tuning bolts 403 are positioned and rotatably arranged in the bolt positioning rotating seats 402, and the threaded rod sections of the fine-tuning bolts 403 are threadedly connected in the threaded sleeves 401. A first guiding tooth groove 202 distributed in a ring shape is opened on the inner side of the lower manhole cover 2, and a second guiding tooth groove 301 distributed in a ring shape is opened on the outer side of the upper manhole cover 3. The first guiding tooth groove 202 and the second guiding tooth groove 301 are adapted to each other, and the lower manhole cover 2 and the upper manhole cover 3 are guided and inserted through the first guiding tooth groove 202 and the second guiding tooth groove 301; In the present invention, the upper manhole ring 3 and the lower manhole ring 2 are connected by a height fine-tuning component 4. During construction and installation, the upper manhole rings 3 are inserted into the lower manhole ring 2 through guiding and plugging by the first guiding tooth groove 202 and the second guiding tooth groove 301. The threaded rod section of the fine-tuning bolt 403 is screwed into the threaded sleeve 401. According to the height of the roadbed horizontal plane and the stress requirements, the fine-tuning bolt 403 is rotated to make the height of the upper manhole ring 3 meet the requirements, further improving the convenience of height adjustment and the installation efficiency of the ductile iron manhole cover. A cover 5 is snap-fitted on the upper manhole ring 3. A snap-fitting ring groove 302 is formed at the upper end of the upper manhole ring 3. A snap-fitting ring 501 adapted to the snap-fitting ring groove 302 is provided at the bottom end of the cover 5. The cover 5 is snap-fitted on the upper manhole ring 3 through the snap-fitting ring 501 and the snap-fitting ring groove 302. At the position between adjacent bolt positioning rotating seats 402 corresponding to the outer periphery of the upper manhole ring 3 at the bottom end of the cover 5, a limiting arc-shaped plate 502 is provided. The limiting arc-shaped plate 502 is aligned and snap-fitted between adjacent bolt positioning rotating seats 402. At the position corresponding to the end of the fine-tuning bolt 403 at the bottom of the cover 5, a bolt end groove 503 is formed. The bolt end groove 503 is snap-fitted at the end of the fine-tuning bolt 403. The present invention is provided with a cover 5, and the cover 5 is aligned and snap-fitted on the upper manhole ring 3 by aligning the snap-fitting ring 501 with the snap-fitting ring groove 302, aligning the limiting arc-shaped plate 502 between adjacent bolt positioning rotating seats 402, and aligning the bolt end groove 503 with the end of the fine-tuning bolt 403, improving the snap-fitting positioning accuracy of the cover 5 and ensuring the horizontal consistency between the cover 5 and the roadbed surface. A manhole cover body 6 is provided on the cover 5. A manhole cover bearing ring 303 is provided on the inner side of the upper part of the upper manhole ring 3. The manhole cover body 6 is provided on the manhole cover bearing ring 303 and is located inside the cover 5, and the upper end surfaces of the manhole cover body 6 and the cover 5 are flush. Radial reinforcing ribs 601 distributed in a ring are provided on the manhole cover body 6. Reinforcing rings 602 increasing in sequence are provided between the radially distributed radial reinforcing ribs 601 distributed in a ring. The manhole cover body 6 of the present invention is provided with radially distributed radial reinforcing ribs 601 distributed in a ring, and reinforcing rings 602 increasing in sequence are provided between the radially distributed radial reinforcing ribs 601 distributed in a ring, improving the structural strength and load-bearing performance of the manhole cover body 6.

[0020] The present invention is provided with a threaded connection between the manhole ring base 1 and the lower manhole ring 2, and a height fine-tuning component 4 is connected between the upper manhole ring 3 and the lower manhole ring 2. Coarse and fine height adjustment operations are adopted, which is convenient for adjusting the height of the ductile iron manhole cover during construction and installation, meeting the construction and installation requirements of manhole covers on different roadbeds, and eliminating the need for multiple adjustments to the roadbed surface, greatly improving the installation efficiency and convenience of the ductile iron manhole cover.

[0021] The construction method of the ductile iron manhole cover with adjustable construction height provided in this embodiment includes the following steps: A, Subgrade pretreatment: At the position of the sewer pipe opening, excavate the construction pit for the ductile iron manhole cover according to the construction requirements, and trim the bottom of the pit to ensure that the flatness error of the bottom of the pit ≤ 2 mm / m²; B, Construction height adjustment: B1, Coarse height adjustment: Align the outer expansion ring plate 101 of the manhole ring base 1 with the sewer pipe opening and place it into the construction pit for the ductile iron manhole cover. Then, use a laser level for horizontal adjustment to make the contact bumps 103 at the bottom of the outer expansion ring plate 101 closely contact the inside of the construction pit for the ductile iron manhole cover. Next, thread-connect the lower manhole ring 2 onto the external thread ring cylinder 102 through the internal thread ring groove 201. According to the height and stress requirements of the subgrade horizontal plane, rotate the lower manhole ring 2 threadedly to make the height of the lower manhole ring 2 meet the requirements, and perform horizontal adjustment again using a laser level; B2, Fine height adjustment: Insert the upper manhole rings 3 into the lower manhole ring 2 through the first guide tooth groove 202 and the second guide tooth groove 301 for guiding. Thread the threaded rod section of the fine adjustment bolt 403 into the threaded sleeve 401. According to the height and stress requirements of the subgrade horizontal plane, rotate the fine adjustment bolt 403 to make the height of the upper manhole rings 3 meet the requirements, and perform horizontal adjustment again using a laser level; C, Manhole cover installation: Align the clamping ring 501 with the clamping ring groove 302, align the limiting arc-shaped plate 502 between adjacent bolt positioning rotating seats 402, and align the bolt end groove 503 with the end of the fine adjustment bolt 403. Then, snap the cover 5 onto the upper manhole ring 3, place the manhole cover body 6 on the manhole cover bearing ring 303, and make the upper end surfaces of the manhole cover body 6 and the cover 5 flush with the subgrade horizontal plane. The construction and installation of the ductile iron manhole cover are completed.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ductile iron manhole cover with adjustable construction height, characterized in that, Including: A well ring base (1), and the well ring base (1) is arranged on a construction roadbed; A lower well ring (2), and the lower well ring (2) is adjustably arranged on the well ring base (1); An upper well ring (3), and the upper well ring (3) is connected to the lower well ring (2) through a height fine-tuning component (4); A cover (5), and the cover (5) is snap-fitted on the upper well ring (3); A manhole cover body (6), and the manhole cover body (6) is arranged on the cover (5).

2. The ductile iron manhole cover based on adjustable construction height according to claim 1, wherein: The well ring base (1) includes an outward-expanded ring plate (101) and an externally threaded ring cylinder (102); The externally threaded ring cylinder (102) is arranged on the outward-expanded ring plate (101), and the outer diameter of the outward-expanded ring plate (101) is greater than the outer diameter of the externally threaded ring cylinder (102).

3. A ductile iron manhole cover based on adjustable construction height according to claim 2, characterized in that: The bottom of the outward-expanded ring plate (101) is provided with contact bumps (103) distributed in a ring shape.

4. A ductile iron manhole cover based on adjustable construction height according to claim 2, characterized in that: An internally threaded ring groove (201) is formed inside the lower part of the lower well ring (2), and the lower well ring (2) is threadedly connected to the externally threaded ring cylinder (102) through the internally threaded ring groove (201).

5. A ductile iron manhole cover based on adjustable construction height according to claim 1, characterized in that: The height fine-tuning component (4) includes a threaded sleeve (401), a bolt positioning rotating seat (402), and a fine-tuning bolt (403); A plurality of the threaded sleeves (401) are provided, and the plurality of threaded sleeves (401) are distributed in a ring shape on the outer periphery of the upper part of the lower well ring (2); A plurality of the bolt positioning rotating seats (402) are provided, and the plurality of bolt positioning rotating seats (402) are distributed in a ring shape on the outer periphery of the upper part of the upper well ring (3), and the plurality of threaded sleeves (401) and the plurality of bolt positioning rotating seats (402) are aligned and distributed; A plurality of the fine-tuning bolts (403) are provided, the ends of the plurality of fine-tuning bolts (403) are positioned and rotatably arranged in the bolt positioning rotating seats (402), and the threaded rod sections of the fine-tuning bolts (403) are threadedly connected in the threaded sleeves (401).

6. The ductile iron manhole cover based on adjustable construction height according to claim 5, wherein: A first guiding tooth groove (202) distributed in a ring shape is formed inside the lower well ring (2), a second guiding tooth groove (301) distributed in a ring shape is formed on the outer side of the upper well ring (3), and the first guiding tooth groove (202) and the second guiding tooth groove (301) are adapted to each other; And the lower well ring (2) and the upper well ring (3) are guided and inserted into each other through the first guiding tooth groove (202) and the second guiding tooth groove (301).

7. A ductile iron manhole cover based on adjustable construction height according to claim 1, characterized in that: A clamping ring groove (302) is formed at the upper end of the upper well ring (3), a clamping ring (501) adapted to the clamping ring groove (302) is arranged at the bottom end of the cover (5), and the cover (5) is snap-fitted on the upper well ring (3) through the clamping ring (501) and the clamping ring groove (302); A limiting arc-shaped plate (502) is arranged at the bottom end of the cover (5) corresponding to the outer periphery of the upper well ring (3) at a position between adjacent bolt positioning rotating seats (402), and the limiting arc-shaped plate (502) is aligned and clamped between adjacent bolt positioning rotating seats (402).

8. A ductile iron manhole cover based on adjustable construction height according to claim 7, characterized in that: At the position of the bottom of the cover (5) corresponding to the end of the fine-tuning bolt (403), a bolt end slot (503) is provided, and the bolt end slot (503) is clamped at the end of the fine-tuning bolt (403).

9. A ductile iron manhole cover based on adjustable construction height according to claim 1, characterized in that: On the inner side of the upper part of the upper well ring (3), a well cover bearing ring (303) is provided. The well cover body (6) is arranged on the well cover bearing ring (303), located inside the cover (5), and the upper end surfaces of the well cover body (6) and the cover (5) are flush; On the well cover body (6), radially distributed radial reinforcing ribs (601) are arranged in a ring shape, and reinforcing rings (602) that increase in sequence are arranged between the radially distributed radial reinforcing ribs (601).

10. A construction method of a ductile iron manhole cover with adjustable construction height according to any one of claims 1-9, characterized in that, It includes the following steps: A. Subgrade pretreatment: At the position of the sewage pipe opening, a construction pit for the ductile iron manhole cover is excavated according to the construction requirements, and the bottom of the pit is trimmed to ensure that the flatness error of the bottom of the pit ≤ 2 mm / m²; B. Construction height adjustment: B1. Coarse height adjustment: Align the outer expansion ring plate (101) of the well ring base (1) with the sewage pipe opening and place it into the construction pit for the ductile iron manhole cover. Then, level adjustment is carried out through a laser level, so that the contact bumps (103) at the bottom of the outer expansion ring plate (101) are in close contact with the construction pit for the ductile iron manhole cover. Then, the lower well ring (2) is threadedly connected to the external thread ring cylinder (102) through the internal thread ring groove (201). According to the height and stress requirements of the subgrade horizontal plane, the lower well ring (2) is rotated threadedly to make the height of the lower well ring (2) meet the requirements, and level adjustment is carried out again through a laser level; B2. Fine height adjustment: The upper well rings (3) are inserted into the lower well ring (2) through the first guide tooth groove (202) and the second guide tooth groove (301) for guiding. The threaded rod section of the fine-tuning bolt (403) is screwed into the threaded sleeve (401). According to the height and stress requirements of the subgrade horizontal plane, the fine-tuning bolt (403) is rotated to make the height of the upper well ring (3) meet the requirements, and level adjustment is carried out again through a laser level; C. Manhole cover installation: By aligning the clamping ring (501) with the clamping ring groove (302), the limiting arc-shaped plate (502) with the space between adjacent bolt positioning rotating seats (402), and the bolt end slot (503) with the end of the fine-tuning bolt (403), the cover (5) is aligned and clamped on the upper well ring (3). The well cover body (6) is placed on the well cover bearing ring (303), and the upper end surfaces of the well cover body (6) and the cover (5) are flush with the subgrade horizontal plane. The construction installation of the ductile iron manhole cover is completed.

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