A saddle-shaped well device for use on small-diameter main pipes and its construction method

Abstract

This invention relates to a manhole cover device and its construction method for adding to a small-diameter main pipe. The manhole cover device is installed above the small-diameter main pipe and includes a manhole body and a retaining structure. The manhole body includes a pile foundation, a ring beam, a combined base plate, and sidewalls. The small-diameter main pipe is installed at the bottom of the manhole body via the combined base plate. The pile foundation is fixedly connected to the ring beam, and the combined base plate and sidewalls are respectively fixedly connected to the ring beam. The retaining structure is fitted onto the outside of the manhole body. Compared with the prior art, this invention has advantages such as wide applicability, strong resistance to deformation, minimal environmental impact, and cost savings.

Description

Technical Field

[0001] This invention relates to the field of manhole technology, and in particular to a manhole device for installation on a small-diameter main pipe and its construction method. Background Technology

[0002] Manholes built on top of small-diameter main pipelines are commonly used in trenchless pipeline projects. They increase the length of trenchless pipelines while minimizing the impact of construction on surrounding areas such as municipal roads and pipelines.

[0003] The current general practice for constructing manholes using the trenchless method is as follows: During the trenchless construction process, a specialized pipe section is used to replace a portion of the ordinary pipe section. This specialized pipe section is typically encased in a steel plate. Then, the soil is supported using open excavation or a steel casing method to expose the specialized pipe section, and the steel casing and the outer steel plate are welded together. Finally, a reinforced concrete inspection well and ancillary facilities are constructed inside the steel casing. The construction of conventional manholes requires certain conditions, such as a minimum diameter for the main pipe and pre-planned placement of the specialized pipe section.

[0004] With the continuous development of urban construction, trenchless methods are increasingly encountering underground pipelines and obstacles during implementation. Due to these external conditions, trenchless methods are often forced to be discontinued, necessitating the addition of manholes to existing pipelines. Furthermore, when the main pipe diameter is small, the conventional manhole construction method is no longer sufficient. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a saddle-shaped well device and its construction method that can be added to a small-diameter main pipe, has a wide range of applications, strong resistance to deformation, minimal environmental impact, and saves investment.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A manhole cover device is added to a small-diameter main pipe. The manhole cover device is positioned above the small-diameter main pipe and includes a manhole cover body and a retaining structure. The manhole cover body includes a pile foundation, a ring beam, a combined bottom plate, and side walls. The small-diameter main pipe is installed at the bottom of the manhole cover body via the combined bottom plate. The pile foundation is fixedly connected to the ring beam. The combined bottom plate and side walls are respectively fixedly connected to the ring beam. The retaining structure is fitted onto the outside of the manhole cover body.

[0008] Preferably, the ring beam, the combined bottom plate, and the sidewalls are reinforced concrete structures integrally formed by cast-in-place molding.

[0009] Preferably, the small-diameter main pipe is provided with circumferential reinforcement at the connection with the main body of the manhole; the circumferential reinforcement is fixedly connected to the combined bottom plate; the small-diameter main pipe is provided with longitudinal reinforcement at the connection with the main body of the manhole; the longitudinal reinforcement is fixedly connected to the ring beam and the side wall.

[0010] Preferably, the height of the pile top extending into the ring beam is not less than 0.1m; after the concrete at the pile top is removed, the length of the main reinforcement bar of the pile body anchored into the ring beam is not less than 35d.

[0011] Preferably, the sidewall is provided with a through hole for connecting a branch pipe.

[0012] Preferably, the diameter of the small-diameter main pipe is not less than 1000 mm.

[0013] Preferably, the small-diameter main pipe is a reinforced concrete structure.

[0014] A method for constructing a saddle-shaped manhole device for use in the above-mentioned saddle-shaped manhole device, the method comprising:

[0015] Step 1: Determine the location of the new saddle well body and verify the parameter data of the small-diameter main pipe at that location;

[0016] Step 2: Construct the retaining structure and pile foundation, and excavate to the bottom of the ring beam to expose the small-diameter main pipe. Then, remove the pile heads of the pile foundation to expose the main reinforcement.

[0017] Step 3: According to the project requirements, remove the concrete from the small-diameter main pipe opening and bend the circumferential and longitudinal main reinforcement bars to the corresponding positions.

[0018] Step 4: Construct the ring beam, combined base plate and side walls using formwork, and leave through holes for connecting branch pipes;

[0019] Step 5: After the main structure of the saddle shaft meets the strength requirements, apply an anti-corrosion coating, complete the installation of the auxiliary facilities of the saddle shaft, backfill with soil, and then remove the retaining structure.

[0020] Preferably, the retaining structure is constructed using a combination of bored cast-in-place piles and a water-stop curtain; the pile foundation is constructed using bored cast-in-place piles.

[0021] Preferably, step 3 specifically comprises:

[0022] After the concrete is removed from the opening of the small-diameter main pipe, the circumferential reinforcing bars are bent into the combined base slab and welded to the main reinforcing bars of the combined base slab; the longitudinal reinforcing bars are bent into the ring beam and side wall and welded to the main reinforcing bars of the ring beam and side wall respectively.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] I. Wide range of applications: The saddle-shaped manhole device and its construction method in this invention solve the problem of trenchless construction for small-diameter pipelines, expand the application range of saddle-shaped manholes, and enhance the advantages of trenchless construction technology.

[0025] Second, it has strong resistance to deformation. The saddle-shaped manhole device and its construction method in this invention connect the saddle-shaped manhole with the small-diameter main pipe by combining the bottom plate, ring beam and side wall, which improves the resistance to deformation of the small-diameter main pipe. By setting pile foundation, the overall ability to resist the upper load is improved, avoiding the risk of pipeline and road damage caused by the loosening of pipe sections due to the direct excavation of the small-diameter main pipe.

[0026] Third, minimal impact on the surrounding environment: The size of the saddle-shaped well device in this invention is small, and the excavation surface of the foundation pit is small, which reduces the impact on the surrounding environment such as municipal traffic and pipelines.

[0027] IV. Investment Savings: Compared with building new inspection wells, the saddle-shaped well device and its construction method in this invention utilize the existing small-diameter main pipe, eliminating the need to build a large-sized non-excavation working well, thus saving project investment and construction time. Attached Figure Description

[0028] Figure 1 This is a plan view of the saddle-shaped well in this invention;

[0029] Figure 2 This is a longitudinal cross-sectional view of the horse-riding well in this invention;

[0030] Figure 3 This is a cross-sectional view of the horse-riding well in this invention;

[0031] Figure 4 This is a detailed longitudinal cross-sectional view of the well in this invention;

[0032] Figure 5 This is a detailed cross-sectional view of the horse-riding well in this invention.

[0033] The numbers in the diagram are as follows:

[0034] 1. Small-diameter main pipe; 11. Circumferential reinforcement; 12. Longitudinal reinforcement; 2. Main body of the manhole; 21. Pile foundation; 22. Ring beam; 23. Combined bottom slab; 24. Side wall; 3. Enclosure structure; 4. Branch pipe. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] A type of well-mounting device added to a small-diameter main pipe, the structure of which is as follows: Figures 1-5 As shown, the well body 2 and the retaining structure 3 are included. The well body 2 includes a pile foundation 21, a ring beam 22, a combined bottom plate 23 and a side wall 24. The small-diameter main pipe 1 is installed at the bottom of the well body 2 through the combined bottom plate 23. The pile foundation 21 is fixedly connected to the ring beam 22. The combined bottom plate 23 and the side wall 24 are fixedly connected to the ring beam 22 respectively. The retaining structure 3 is sleeved on the outside of the well body 2.

[0037] In this embodiment, the ring beam 22, the combined bottom plate 23, and the side wall 24 are reinforced concrete structures integrally formed by cast-in-place casting.

[0038] The small-diameter main pipe 1 is provided with circumferential reinforcing bars 11 at the connection with the main body 2 of the manhole. The circumferential reinforcing bars are fixedly connected to the combined base plate 23. The small-diameter main pipe 1 is also provided with longitudinal reinforcing bars 12 at the connection with the main body 2 of the manhole. The longitudinal reinforcing bars 12 are fixedly connected to the ring beam 22 and the side wall 24. The pile top of the pile foundation 21 penetrates into the ring beam 22 by a height of not less than 0.1m. After the concrete at the pile top of the pile foundation 21 is removed, the length of the main reinforcement of the pile body of the pile foundation 21 anchored into the ring beam 22 is not less than 35d.

[0039] In this embodiment, the side wall 24 of the main body 2 of the horse-riding well is provided with a through hole for connecting the branch pipe 4.

[0040] In this embodiment, the diameter of the small-diameter main pipe is not less than 1000mm, and the small-diameter main pipe 1 is also a reinforced concrete structure.

[0041] This embodiment also relates to a construction method for the above-mentioned well-riding device, including:

[0042] Step 1: Determine the location of the newly added saddle well body 2 and verify the parameter data of the small-diameter main pipe at that location;

[0043] Step 2: Construct the retaining structure and pile foundation, and excavate to the bottom of the ring beam to expose the small-diameter main pipe. Then, remove the pile heads of the pile foundation to expose the main reinforcement.

[0044] Step 3: According to project requirements, remove the concrete from the small-diameter main pipe opening section, and bend the circumferential and longitudinal main reinforcement bars to the corresponding positions, specifically:

[0045] After the concrete is removed from the opening of the small-diameter main pipe, the circumferential reinforcing bars are bent into the combined bottom slab and welded to the main reinforcing bars of the combined bottom slab. The longitudinal reinforcing bars are bent into the ring beam and side wall and welded to the main reinforcing bars of the ring beam and side wall respectively. When the diameter of the small-diameter main pipe 1 is small, the setting of the ring beam 22 has a significant impact on the pipe cross section. The ring beam 22 can be used to cross the small-diameter main pipe 1 in an arc shape. The longitudinal reinforcing bars 12 are bent upward and anchored into the ring beam 22.

[0046] The opening size for the small-diameter main pipe is: While ensuring the requirements for use are met, the impact on the original pipeline is minimal;

[0047] Step 4: Construct the ring beam, combined base plate and side walls using formwork, and leave through holes for connecting branch pipes;

[0048] Step 5: After the structural strength of the main body of the saddle well 2 meets the requirements, apply the anti-corrosion coating, complete the installation of the auxiliary facilities of the saddle well, backfill with soil, and then remove the retaining structure.

[0049] In this embodiment, the concrete strength grade of the ring beam 22, the combined bottom plate 23 and the side wall 24 is C45, which is one grade different from the strength of the small diameter main pipe 1.

[0050] In step 5, the dewatering measures of the retaining structure 3 should be maintained until the main body 2 of the well is completed before they can be removed, so as to avoid the risk of the main body 2 of the well floating during the construction process.

[0051] The specific dimensional and construction requirements for each structure in this embodiment are as follows:

[0052] The retaining structure 3 adopts a structure of bored piles + cutoff wall, with in-pit reinforcement and dewatering measures installed within the foundation pit. This method, in addition to ensuring certain strength and stability, also has advantages such as flexible construction and small footprint. The cutoff wall is appropriately reinforced at the small-diameter main pipe 1. The retaining structure 3 has a circular plan shape, eliminating the need for internal supports within the foundation pit. It is directly used as the outer formwork of the sidewall 24, reducing the excavation area.

[0053] The pile foundation 21 uses 600mm diameter bored cast-in-place piles. These are non-displacement piles, minimizing their impact on the small-diameter main pipe 1 and the surrounding environment during construction. They are suitable for demanding engineering sites. The pile top extends at least 0.1m into the ring beam 222, and the pile diameter does not exceed 0.6m. There are at least four piles in the foundation 21, evenly distributed between the small-diameter main pipe 1 and the retaining structure 3. Before excavation, the pit should be pre-watered, with the water level reaching 1m below the bottom slab before excavation. Excavation must strictly adhere to relevant specifications, and over-excavation is strictly prohibited. The opening width of the small-diameter main pipe 1 perpendicular to the pipe direction is no more than 0.8m. The ring beam height is no more than 0.5m. When the diameter of the small-diameter main pipe is small, an arc-shaped design is used to cross it.

[0054] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A mounting well device for adding to a small-diameter main pipe, the mounting well device being disposed above the small-diameter main pipe (1), characterized in that, The well-riding device includes a well-riding body (2) and a retaining structure (3); the well-riding body (2) includes a pile foundation (21), a ring beam (22), a combined base plate (23), and a side wall (24); the small-diameter main pipe (1) is installed at the bottom of the well-riding body (2) through the combined base plate (23); the pile foundation (21) is fixedly connected to the ring beam (22); the combined base plate (23) and the side wall (24) are fixedly connected to the ring beam (22) respectively; the retaining structure (3) is fitted on the outside of the well-riding body (2), and the retaining structure (3) has a circular planar shape; The small-diameter main pipe (1) is provided with circumferential reinforcing bars (11) at the connection with the main body of the well (2); after the concrete is removed from the opening of the small-diameter main pipe, the circumferential reinforcing bars (11) are bent into the combined bottom plate (23) and welded to the main reinforcement of the combined bottom plate; the small-diameter main pipe (1) is provided with longitudinal reinforcing bars (12) at the connection with the main body of the well (2); the longitudinal reinforcing bars (12) are bent into the ring beam (22) and the side wall (24) and welded to the main reinforcement of the ring beam (22) and the side wall (24) respectively; The height of the pile top of the pile foundation (21) extending into the ring beam (22) shall not be less than 0.1m; after the concrete at the top of the pile foundation (21) is removed, the length of the main reinforcement of the pile body anchored into the ring beam (22) shall not be less than 35d.

2. The well-drilling device for adding to a small-diameter main pipe according to claim 1, characterized in that, The ring beam (22), the combined bottom plate (23), and the side wall (24) are reinforced concrete structures integrally formed by cast-in-place.

3. The saddle-shaped well device added to a small-diameter main pipe according to claim 1, characterized in that, The sidewall (24) is provided with a through hole for connecting the branch pipe (4).

4. The saddle-shaped well device added to a small-diameter main pipe according to claim 1, characterized in that, The diameter of the small-diameter main pipe (1) is not less than 1000 mm.

5. A saddle-shaped well device added to a small-diameter main pipe according to claim 1, characterized in that, The small-diameter main pipe (1) is a reinforced concrete structure.

6. A construction method for an extension of a small-diameter main pipe into a manhole device as described in claim 1, characterized in that, The construction method for the aforementioned well-riding device includes: Step 1: Determine the location of the new saddle well body and verify the parameter data of the small-diameter main pipe at that location; Step 2: Construct the retaining structure and pile foundation, and excavate to the bottom of the ring beam to expose the small-diameter main pipe. Then, remove the pile heads of the pile foundation to expose the main reinforcement. Step 3: According to the project requirements, remove the concrete from the small-diameter main pipe opening and bend the circumferential and longitudinal main reinforcement bars to the corresponding positions. Step 4: Construct the ring beam, combined base plate and side walls using formwork, and leave through holes for connecting branch pipes; Step 5: After the main structure of the saddle shaft meets the strength requirements, apply an anti-corrosion coating, complete the installation of the auxiliary facilities of the saddle shaft, backfill with soil, and then remove the retaining structure.

7. The construction method of a saddle-shaped well device added to a small-diameter main pipe according to claim 6, characterized in that, The retaining structure is constructed using a combination of bored cast-in-place piles and a water-stop curtain; the pile foundation is constructed using bored cast-in-place piles.

8. The construction method of a saddle-shaped well device added to a small-diameter main pipe according to claim 6, characterized in that, Step 3 specifically includes: After the concrete is removed from the opening of the small-diameter main pipe, the circumferential reinforcing bars are bent into the combined base slab and welded to the main reinforcing bars of the combined base slab; the longitudinal reinforcing bars are bent into the ring beam and side wall and welded to the main reinforcing bars of the ring beam and side wall respectively.

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