Special-shaped steel casing for underground pipeline relocation
The asymmetric steel shield tube addresses the challenge of excavating and reconfiguring large-diameter underground pipelines in soft soil by securely exposing the pipeline for safe and efficient reconfiguration, reducing environmental impact and costs.
Patent Information
- Application Number
- CN202422037712.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In a silt soft soil environment, it is difficult to safely and relocate large-diameter deep buried underground pipelines, and cannot provide sufficient cutting operation surfaces. The traditional enclosure structure cannot be closely fitted with the pipeline, resulting in water and soil pouring into the foundation pit, posing a safety hazard.
The special-shaped steel casing is designed to be connected to the standard steel casing. The cross-section of the special-shaped steel casing is circular and the bottom is arched and arched. It can be closely fit with the outer contour of the underground pipeline, providing a closed operating space, resisting the soil and water pressure outside the enclosure structure, and ensuring the complete excavation of the soil in the foundation pit.
It has achieved safe, high-quality and efficient relocation of large-diameter deep buried underground pipelines, reduced construction risks, reduced environmental pollution, saved project costs, shortened construction periods, and provided a safe and reliable cutting operation surface.
Smart Images
Figure CN223103660U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of construction machinery, in particular to a special-shaped steel casing for underground pipeline relocation. Background Technique
[0002] In order to effectively solve the problem of tense urban planning land use and intensify land resources, the development of underground space resources has become one of the important tasks of many large and medium-sized cities. And pipeline relocation is the key and difficult point of urban underground space resource development, especially for large-diameter pipelines with deeper buried depths under soft soil conditions. As is well known, most coastal areas in China are generally distributed with silt soft soil layers. The engineering properties of silt soft soil are relatively poor, with typical "five highs and two lows" characteristics, mainly manifested as high water content, high rheology, high void ratio, high compressibility, high sensitivity, low permeability, low strength, etc. For the relocation of large-diameter deep-buried underground pipelines, how to safely excavate the underground pipelines and carry out relocation has become a difficult problem. In the environment of silt soft soil layers, when the excavation depth is relatively shallow, retaining methods such as tensile steel plates and PC steel pipe piles can be used, and generally the excavation depth is less than 3m. When the excavation depth is relatively deep, the underground continuous wall + internal support retaining method is often used. However, affected by the shape of the underground pipeline and the form of the retaining structure, the above several retaining methods cannot expose all the underground pipelines, and cannot provide a safe and reliable pipeline cutting and splicing working surface. Content of the Utility Model
[0003] In view of this, the embodiment of the utility model provides a special-shaped steel casing for underground pipeline relocation. Through engineering practice, it is proved that using this special-shaped steel casing for the relocation of large-diameter deep-buried underground pipelines can ensure the smooth relocation of pipelines safely, with high quality and high efficiency, and has good economic and social benefits, with unexpected technical effects.
[0004] To achieve the above object, according to one aspect of the utility model, there is provided a special-shaped steel casing for underground pipeline relocation, at least including: a first steel casing component and a second steel casing component, the first steel casing component is connected to the second steel casing component, wherein, the first steel casing component is a single-section arched tongue-and-groove steel casing, and the second steel casing component is a single-section or multi-section standard steel casing, and the cross-section of the special-shaped steel casing is circular, and the bottom of the special-shaped steel casing is made into an arched tongue-and-groove shape.
[0005] Optionally, the arched tongue-and-groove steel casing is formed by rolling a steel plate into a circle and welding the joints, and then symmetrically cutting off both sides of the bottom of the special-shaped steel casing according to the tongue-and-groove dimensions into an arched tongue-and-groove shape.
[0006] Optionally, the standard steel casing is formed by rolling a steel plate into a circle, and the joints of the rolled steel plate are welded and connected.
[0007] Optionally, the arched rabbet of the special-shaped steel casing can fit the outer contour of the underground pipeline to be relocated.
[0008] Optionally, the insertion ratio of the special-shaped steel casing is 1:0.
[0009] Optionally, the inner diameter of the special-shaped steel casing is larger than the diameter of the underground pipeline to be relocated.
[0010] Optionally, the height of the arched rabbet of the special-shaped steel casing is larger than the diameter of the underground pipeline to be relocated.
[0011] Optionally, the arched rabbet of the special-shaped steel casing includes the upper width of the arched rabbet and the lower width of the arched rabbet.
[0012] Optionally, the upper width of the arched rabbet is smaller than the lower width of the arched rabbet.
[0013] Optionally, the arched diameter of the special-shaped steel casing is equal to the upper width of the arched rabbet of the special-shaped steel casing.
[0014] The embodiments in the above-mentioned utility model have the following advantages or beneficial effects:
[0015] 1. The utility model is widely applicable to the construction of underground pipeline relocation in the silt soft soil stratum in coastal areas, especially for large-diameter deep-buried underground pipelines.
[0016] 2. By using the special-shaped steel casing for enclosure, the underground pipeline structure can be completely excavated, providing a sufficient and safe cutting operation surface, which is beneficial to the operation of workers, with a low safety risk of cutting and is beneficial to improving the quality of pipeline cutting.
[0017] 3. The circular steel structure foundation pit enclosure prefabricated in the factory has reliable stiffness, strength and stability, and the safety risk of the foundation pit is low.
[0018] 4. Compared with the traditional enclosures such as diaphragm walls, the construction operation surface is small, the noise of mechanical equipment is low, the dust is small, the environmental impact is small, and the environmental pollution is greatly reduced, which is beneficial to civilized construction.
[0019] 5. The relocation of large-diameter deep-buried underground pipelines by the special-shaped steel casing can greatly reduce the project construction cost, speed up the project progress and ensure the smooth completion within the construction period.
[0020] The further effects of the above-mentioned non-conventional optional methods will be described in combination with specific embodiments below. Description of the Drawings
[0021] The drawings are used to better understand the utility model and do not constitute an improper limitation to the utility model. Among them:
[0022] Figure 1It is the elevation view of the special-shaped steel casing according to the embodiment of the present utility model;
[0023] Figure 2 It is the plan view of the special-shaped steel casing according to the embodiment of the present utility model;
[0024] Figure 3 It is the schematic diagram before the completion of relocating the underground pipeline with the special-shaped steel casing according to the embodiment of the present utility model;
[0025] Figure 4 It is the schematic diagram after the completion of relocating the underground pipeline with the special-shaped steel casing according to the embodiment of the present utility model. Specific embodiments
[0026] The following will describe exemplary embodiments of the present utility model with reference to the accompanying drawings. Various details of the embodiments of the present utility model are included to facilitate understanding, and they should be considered merely exemplary. Therefore, those of ordinary skill in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present utility model. Similarly, for the sake of clarity and conciseness, the description hereinafter omits the description of well-known functions and structures. In addition, the same or similar reference numerals represent the same or similar structures.
[0027] In the prior art, with the rapid development of underground space, the depth of underground engineering construction is getting deeper and deeper, and at the same time, there are problems of relocating a large number of large-diameter deep-buried pipelines. In order to safely and reliably relocate and cut the large-diameter deep-buried underground pipelines, a special-shaped steel casing has been studied, which can be applied to the relocation of underground pipelines.
[0028] The special-shaped steel casing of an embodiment of the present utility model uses this structure to relocate the large-diameter deep-buried underground pipelines, which can safely, qualitatively and efficiently ensure the smooth relocation of the pipelines, and has good economic and social benefits, with unexpected technical effects. Further, the special-shaped steel casing structure of the embodiment of the present utility model creatively solves the technical problem of pipeline relocation to be solved by the present utility model, skillfully exposes all the underground pipelines, and creatively provides a safe and reliable pipeline cutting working surface, with unexpected technical effects.
[0029] Hereinafter, the present utility model will describe the special-shaped steel casing of the present utility model in detail.
[0030] In an embodiment of the present utility model, a special-shaped steel casing for underground pipeline relocation at least includes: a first steel casing assembly and a second steel casing assembly, the first steel casing assembly is connected to the second steel casing assembly, wherein the first steel casing assembly is a single-section arched tongue-and-groove steel casing, and the second steel casing assembly is a single-section or multi-section standard steel casing, and the cross-section of the special-shaped steel casing is circular, and the bottom of the special-shaped steel casing is made into an arched tongue-and-groove shape. Specifically as described above Figure 1 and Figure 2 shown Figure 1 is the elevation view of the enclosure of the special-shaped steel casing according to the embodiment of the present utility model; Figure 2 is the plan view of the enclosure of the special-shaped steel casing according to the embodiment of the present utility model.
[0031] In an embodiment of the present utility model, the arched tongue-and-groove steel casing is formed by rolling a steel plate into a circle and welding the joints, and then symmetrically cutting both sides of the bottom of the special-shaped steel casing into an arched tongue-and-groove shape according to the tongue-and-groove dimensions. The standard steel casing is formed by rolling a steel plate into a circle, and the joints of the rolled steel plate are welded and connected. Moreover, the arched tongue-and-groove of the special-shaped steel casing can fit the outer contour of the underground pipeline to be relocated.
[0032] Furthermore, according to the present utility model Figure 2 and Figure 3 , the height h of the arched tongue-and-groove of the special-shaped steel casing in the embodiment of the present utility model is greater than the diameter d (not shown) of the underground pipeline to be relocated; the inner diameter D of the special-shaped steel casing is greater than the diameter of the underground pipeline to be relocated; the arched tongue-and-groove of the special-shaped steel casing includes the upper width and the lower width of the arched tongue-and-groove, the upper width of the arched tongue-and-groove is less than the lower width of the arched tongue-and-groove; the arched diameter of the special-shaped steel casing is equal to the upper width of the arched tongue-and-groove of the special-shaped steel casing.
[0033] As Figure 2 shown, the cross-section of the special-shaped steel casing is circular, and as Figure 1As shown in the figure, the bottom of the special-shaped steel casing is made into an arched rabbet that fits the size of the underground pipeline to be relocated, so that the special-shaped steel casing can fit perfectly with the underground pipeline to be relocated. That is to say, the cross-section of the special-shaped steel casing is circular, the bottom of the special-shaped steel casing is made into an arched rabbet shape, and the arched rabbet of the special-shaped steel casing can fit the outer contour of the underground pipeline to be relocated. In the present utility model, the cross-section of the special-shaped steel casing is circular, and the special-shaped part is that the bottom of the steel casing is made into an arched rabbet form, which creatively improves the traditional steel casing (in a flat rabbet form). That is to say, the main feature of the "special-shaped" in the "special-shaped steel casing" of the embodiment of the present utility model is to adjust the traditional closed structure at the bottom of the steel casing to an arched rabbet structure. For the premise of relocating large-diameter underground pipelines buried deep, it is necessary to excavate all the underground pipelines to be relocated. The arched rabbet structure of the present utility model can perfectly fit the outer contour of the underground pipeline to be relocated. As the retaining structure, the soil inside the casing can be excavated to expose all the underground pipelines to be relocated, and prevent the soil from flowing into the steel casing, providing a closed and safe operation space for the splicing of the underground pipelines to be relocated.
[0034] More specifically, for large-diameter underground pipelines, they are often buried deep. The premise of relocation and splicing is to excavate and expose the pipelines, which involves how to excavate safely and reliably. In special soft soil areas along the coast, foundation pit excavation is a sub-project with relatively high risks, involving multiple major risk sources. If the retaining structure of the foundation pit is not in place, it will cause large deformations of the foundation pit, and even safety accidents such as foundation pit collapse may occur. Traditional retaining structures, such as Larssen steel sheet piles, steel pipe piles, bored cast-in-place piles, and diaphragm walls, although they can provide relatively high retaining strength and ensure the stability of the foundation pit, cannot fit tightly with the underground pipelines to be relocated. During the foundation pit excavation process, water and soil will flow into the foundation pit through the channels where the retaining structure does not fit with the underground pipeline, and the safety and reliability of the foundation pit cannot be ensured. However, the "special-shaped steel casing" of the present utility model can fit perfectly with the underground pipeline to be relocated by making an arched rabbet that fits the size of the underground pipeline to be relocated, providing a closed structure for the foundation pit excavation to resist water and soil outside the retaining structure, ensuring that the soil inside the foundation pit can be completely excavated to expose the underground pipeline, and providing a safe and reliable space for the splicing of the underground pipeline to be relocated, thus creatively overcoming the technical problems in the prior art and bringing unexpected technical effects.
[0035] The special-shaped steel casing of the embodiment of the utility model is set to an arched tongue shape. By making an arched tongue that fits the size of the underground pipeline, the steel casing can be completely fitted with the underground pipeline, providing a closed structure for foundation pit excavation, used to resist water and soil outside the retaining structure, and ensure that the soil in the foundation pit can be completed. Traditional retaining structures, such as Larsen steel sheet piles, steel pipe piles, bored piles and underground continuous walls, can provide greater strength of retaining strength and ensure the stability of the foundation pit, but cannot fit the underground pipeline to be relocated tightly. During the excavation of the foundation pit, water and soil will flow into the foundation pit through the channel where the retaining structure and the underground pipeline are not fitted, and the safety and reliability of the foundation pit cannot be ensured.
[0036] More specifically, Figure 1 and Figure 2 As shown, the relevant features of the special-shaped steel casing and the tongue and groove size are recorded. Figure 2 In the equation, the inner diameter of the special-shaped steel casing is D, and d is the diameter of the underground pipeline to be relocated (not shown). The inner diameter D of the special-shaped steel casing is equal to the sum of the diameter d of the underground pipeline to be relocated and the operating space with a width of 1.5 m on both sides, which is the following equation 1.
[0037]
[0038] In equation 1: —Inner diameter of special-shaped steel casing
[0039] 1. Change the diameter of underground pipeline
[0040] In the embodiment of the present utility model Figure 3 In the figure, the special-shaped steel casing is an arched tongue-and-groove structure, the width is the diameter of the underground pipeline to be relocated, and the tongue-and-groove structure size is Equation 2.
[0041]
[0042]
[0043] In equation 2: —Width of the upper edge of the arched groove of the special-shaped steel casing;
[0044] —The width of the lower edge of the arched groove of the special-shaped steel casing;
[0045] 1. Change the diameter of underground pipelines;
[0046] A special-shaped steel casing arch diameter.
[0047] The height of the arched tongue-and-groove of the special-shaped steel casing is: the diameter d of the relocated underground pipeline, plus an additional 0.9 m height (including 0.3 m thickness of the bottom seal cushion and 0.6 m operating space at the bottom), as shown in Equation 3.
[0048]
[0049] In Equation 3: — The height of the arched tongue-and-groove of the steel casing;
[0050] — The diameter of the relocated underground pipeline.
[0051] Next, the wall thickness of the special-shaped steel casing is calculated and determined according to the soil pressure of the buried depth of the relocated underground pipeline and the stiffness requirements, and should meet the provisions of Article 9.4.1 of G / T 3650-2020 and Article 5.8.6 of the Technical Code for Building Pile Foundations (JGJ94-2008). First, the strength check is carried out. When the special-shaped steel casing sinks in place, the maximum stress on the special-shaped steel casing is the lateral water and soil pressure at the deepest part, and the compressive strength of the steel should be greater than the maximum lateral water and soil pressure, as shown in Equation 4.
[0052]
[0053]
[0054] In Equation 4: — The maximum water and soil pressure
[0055] — The lateral earth pressure coefficient (0.5)
[0056] — The sinking depth of the steel casing
[0057] — The maximum compressive stress of the steel casing
[0058] — A safety factor (2.0)
[0059] — The inner diameter and wall thickness of the steel casing
[0060] — The design value of the compressive strength of the steel (205 )
[0061] Secondly, the local buckling check
[0062] According to the provisions of Article 5.8.6 of the Technical Code for Building Pile Foundations (JGJ94-2008), that is, as shown in Equation 5, when , ; when , 。
[0063] In Equation 5: D, t—the inner diameter and wall thickness of the steel casing
[0064] —the elastic modulus of steel (2.06 ), the design value of compressive strength (205 )
[0065] In addition, in the embodiment of the present utility model, the insertion ratio of the special-shaped steel casing is 1:0. The insertion ratio refers to the ratio of the length of the vertical retaining structure above the bottom of the foundation pit to the length below the bottom of the foundation pit. This insertion ratio is used as a safety reserve coefficient to resist the phenomenon of soil gushing at the bottom of the foundation pit. The "insertion ratio" of the traditional retaining structure is generally "1:1". As the retaining structure for foundation pit excavation, the special-shaped steel casing creatively improves the insertion ratio to 1:0, with almost no need for safety reserve.
[0066] In other words, an "insertion ratio" of "1:0" means almost no safety reserve. This ratio of "1:0" is a special ratio in the foundation pit excavation in coastal soft soil areas and is applied for the first time. Other traditional foundation pit retaining structures are all set with a certain insertion ratio as the safety reserve for foundation pit lateral displacement resistance. The setting of this ratio belongs to the innovative first use. At the same time, compared with the traditional ratio of "1:1", the "insertion ratio" of "1:0" firstly saves the materials of the retaining structure and reduces the cost; secondly, the retaining structure does not need to be inserted too deep, reducing the difficulty of driving the retaining structure, avoiding uncertain factors, and being more convenient for on-site rapid relocation construction. In addition, the shallower driving depth reduces the disturbance to the deep soil layer and reduces the risk of foundation pit deformation, with unexpected technical effects. Moreover, the retaining structure form with an "insertion ratio" of "1:0" can provide a new reference idea for the construction of structures such as rainwater and sewage caissons in municipal engineering, expanding its application scope and application scenarios.
[0067] To better understand the present utility model, the present utility model will be demonstrated according to Figure 3 and Figure 4 to show the relocation of underground pipelines by the special-shaped steel casing in the embodiment of the present utility model. Figure 3 is a schematic diagram before the completion of the relocation of underground pipelines by the special-shaped steel casing according to the embodiment of the present utility model; Figure 4 is a schematic diagram after the completion of the relocation of underground pipelines by the special-shaped steel casing according to the embodiment of the present utility model.
[0068] The external structure of the special-shaped steel casing 101 is formed by sinking and welding a single or multiple standard steel casings and a single arched tongue-and-groove steel casing in sequence. Among them, the cross-section of the special-shaped steel casing 101 is circular, the bottom of the special-shaped steel casing 101 is made into an arched tongue-and-groove shape, and the arched tongue-and-groove of the special-shaped steel casing 101 can fit the outer contour of the underground pipeline to be relocated. The arched steel casing is sunk to the buried depth of the underground pipeline 102 to be relocated, the bottom and upper soil of the special-shaped steel casing are reinforced, the soil inside the special-shaped steel casing is excavated, and the wall of the special-shaped steel casing is used as a enclosure to resist water and soil pressure. After the excavation of the soil in the pit is completed and the bottom is sealed, a reliable working surface is provided for the safe, quality-assured and efficient splicing of the underground pipeline 102.
[0069] After the special-shaped steel casing 101 sinks to the design elevation, there is a gap between the arched tongue-and-groove steel casing and the junction of the underground pipeline, and they cannot be tightly fitted together. This is prone to soil gushing. The MJS foundation reinforcement method is used to reinforce the soil at this location to ensure that the soil around the gap is dense and prevent water and soil from flowing into the steel casing from this location, causing safety accidents. In this way, the arched tongue-and-groove structure of the special-shaped steel casing 101 of the utility model can perfectly fit the outer contour of the underground pipeline 102 to be relocated. As a retaining structure, the soil in the casing can be excavated to expose the entire pipeline, and the soil can be prevented from gushing into the steel casing, providing a closed and safe operating space for the pipeline splicing to resist the water and soil outside the retaining structure, ensuring that the soil in the foundation pit can be completely excavated to expose the underground pipeline, and providing a safe and reliable space for the pipeline splicing, thereby solving the technical problem to be solved by the utility model and bringing unexpected technical effects.
[0070] Using the special-shaped steel casing 101, cutting, relocation and welding of underground pipelines are carried out inside the special-shaped steel casing 101. Figure 3 The underground pipeline 102 shown in FIG. 1 has changed its direction, and the underground pipeline 102 has been successfully relocated (eg, Figure 4 as shown).
[0071] Compared with the traditional enclosure form that cannot relocate underground pipelines, the special-shaped steel casing of the utility model has the advantages of low construction risk, good safety, low cost, and short construction period. Moreover, it has been proved through engineering practice that the special-shaped steel casing enclosure has the following advantages in terms of construction period, economic and social benefits, compared with adjusting the route or burial depth of the project to be built, in terms of relocating the conflicting large-diameter deep-buried underground pipelines and not relocating the underground pipelines:
[0072] 1. Compared with not relocating conflicting pipelines, the conflicting pipelines can be avoided by adjusting the route direction or route depth of the project to be built. Adjusting the route involves approval, which greatly increases the construction period. Relocating conflicting large-diameter deep-buried underground pipelines by enclosing them with special-shaped steel casings can greatly shorten the construction period.
[0073] 2 Economic and Social Benefits
[0074] By relocating the large-diameter deeply-buried underground pipelines in conflict, it is possible to avoid the increase in project costs caused by the adjustment of the alignment and burial depth of the proposed project. At the same time, it also reduces the impact of project changes on the social environment, having good economic and social benefits.
[0075] All in all, compared with traditional retaining methods such as Larsen steel sheets, PC steel pipe piles, and diaphragm walls, the special-shaped steel casing retaining can closely fit with large-diameter deeply-buried underground pipelines, completely exposing the underground pipelines during excavation, providing a safe and reliable cutting operation space for pipeline relocation. The special-shaped steel casing retaining is custom-molded in the factory, with high strength of the retaining structure, and the construction is safe, convenient, efficient. In terms of civilized construction, the special-shaped steel casing retaining has the advantages of a smaller construction operation area, lower noise impact of mechanical equipment, and less dust.
[0076] The above specific implementation manners do not constitute a limitation on the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A special-shaped steel casing for underground pipeline relocation, at least including: The first steel casing component and the second steel casing component, the first steel casing component is connected to the second steel casing component, wherein the first steel casing component is a single-section arched tongue-and-groove steel casing, and the second steel casing component is a single-section or multi-section standard steel casing, and wherein the cross-section of the special-shaped steel casing is circular, and the bottom of the special-shaped steel casing is made into an arched tongue-and-groove shape.
2. The special-shaped steel casing according to claim 1, wherein The arched tongue-and-groove steel casing is formed by rolling a steel plate into a circle and welding the joints, and then symmetrically cutting both sides of the bottom of the special-shaped steel casing into an arched tongue-and-groove shape according to the tongue-and-groove dimensions.
3. The special-shaped steel casing according to claim 1, wherein The standard steel casing is formed by rolling a steel plate into a circle, and the joints of the rolled steel plate are welded and connected.
4. The special-shaped steel casing according to claim 1, characterized in that The arched tongue-and-groove of the arched tongue-and-groove steel casing of the special-shaped steel casing can fit the outer contour of the underground pipeline to be relocated.
5. The special-shaped steel casing according to claim 1, wherein The insertion ratio of the special-shaped steel casing is 1:
0.
6. The special-shaped steel casing according to claim 1, wherein The inner diameter of the special-shaped steel casing is larger than the diameter of the underground pipeline to be relocated.
7. The special-shaped steel casing according to claim 1, wherein The height of the arched tongue-and-groove of the special-shaped steel casing is larger than the diameter of the underground pipeline to be relocated.
8. The special-shaped steel casing according to claim 1, characterized in that, The arched tongue-and-groove of the special-shaped steel casing includes the upper width of the arched tongue-and-groove and the lower width of the arched tongue-and-groove.
9. The special-shaped steel casing according to claim 8, characterized in that, The upper width of the arched tongue-and-groove is smaller than the lower width of the arched tongue-and-groove.
10. The special-shaped steel casing according to claim 1, wherein The arched diameter of the special-shaped steel casing is equal to the upper width of the arched tongue-and-groove of the special-shaped steel casing.