Flexible distributed pipeline anti-floating device for pipe jacking construction in shallow covering soil and high water pressure environment
By installing strip-shaped liquid storage bags inside the pipeline and combining them with real-time control by the monitoring unit, the buoyancy problem of the pipeline under shallow soil cover and high water pressure is solved, thereby improving the stability of the pipeline and construction efficiency. This flexible anti-buoyancy device is suitable for pipe jacking construction.
Patent Information
- Application Number
- CN202520597383.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-04-01
AI Technical Summary
In shallow soil and high water pressure environments, pipes are prone to buoyancy during pipe jacking construction, which can cause them to float, shift, or deform, affecting the stability and safety of the water supply system. Traditional external counterweight anti-buoyancy methods are not very effective.
A strip-shaped liquid storage bag is installed inside the pipeline in the liquid storage unit. The pipeline's own weight is increased by the counterweight inside the pipeline, and the buoyancy is counteracted by the gravity of the liquid. Combined with the monitoring unit, the liquid volume is adjusted in real time to ensure the stability of the pipeline.
It effectively counteracts buoyancy, ensures pipeline stability, prevents floating or displacement, reduces the risk of construction errors, is environmentally friendly and easy to operate, is suitable for various environments, and reduces maintenance costs.
Smart Images
Figure CN223782218U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of pipe jacking construction technology, and in particular relates to a flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environment. Background Technology
[0002] Pipe jacking (also known as pipe jacking construction) is a trenchless construction method commonly used for underground pipeline construction. It is suitable for installing pipelines without disturbing the ground and minimizing impact on traffic and the surrounding environment, especially in scenarios where it is necessary to avoid damaging the ground or existing infrastructure, effectively reducing the environmental impact of construction. It is also suitable for use in confined construction spaces and complex geological environments, and is particularly efficient for projects with small pipe diameters and short lengths. During construction, a pipe jacking machine advances the pipeline from the construction shaft to the target location using a jacking method, completing the pipeline laying. Pipe jacking construction typically consists of two parts: first, advancing the pipeline horizontally or vertically; and second, using the cutterhead and propulsion device of the pipe jacking machine to break through the soil and advance the pipeline. Because pipe jacking technology does not require excavation and can be used for pipeline installation in special environments, it has unique advantages in areas with dense underground facilities, and is therefore considered a relatively environmentally friendly and efficient construction method.
[0003] In water intake projects, pipe jacking has significant advantages. First, it allows for pipeline laying without damaging the ground or surrounding environment, making it ideal for urban or water-related projects and reducing the occupation of surrounding land resources. Second, because pipe jacking machines can precisely control the depth and location of the pipeline, the construction process is stable and reliable, ensuring that the pipeline layout meets design requirements. Furthermore, pipe jacking generates less noise and vibration during construction, resulting in a lower impact on the surrounding ecological environment and contributing to the protection of the ecological balance of the water area.
[0004] In water intake projects, pipeline anti-buoyancy is crucial because buoyancy can cause pipelines to float, shift, or deform, and in severe cases, even rupture. Especially in areas with high groundwater levels, buoyancy can exert a continuous pushing force on the pipeline, leading to instability and affecting the normal operation of the water supply system. Furthermore, pipeline floating can damage the surrounding soil, causing ground subsidence or structural damage, increasing maintenance costs. If buoyancy is not effectively controlled, it can also cause water supply interruptions, affecting water quality or system safety, and even causing serious ecological and economic losses. Therefore, a reasonable anti-buoyancy design is essential to ensure the long-term stability and safety of water intake projects. Currently, traditional external counterweight anti-buoyancy methods are ineffective in dealing with pipeline anti-buoyancy problems under shallow overburden and high water pressure environments. Therefore, there is an urgent need for a flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow overburden and high water pressure environments to improve the efficiency of pipeline anti-buoyancy operations. Utility Model Content
[0005] The purpose of this invention is to provide a flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environments, so as to solve the above-mentioned problems and effectively overcome the floating phenomenon caused by the buoyancy of the pipeline.
[0006] To achieve the above objectives, this utility model provides the following solution: a flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow overburden, high water pressure environment, comprising:
[0007] The liquid storage unit includes a strip-shaped liquid storage bag, which is installed inside a pipeline and is used to hold the weighing liquid. One end of the strip-shaped liquid storage bag is fixedly connected to the pipe jacking machine, and the other end of the strip-shaped liquid storage bag is connected to a fluid control device for pumping liquid into the strip-shaped liquid storage bag.
[0008] The monitoring unit includes an internal sensor assembly and an external sensor assembly, which are respectively disposed on the outer wall of the pipe and the inner wall of the pipe.
[0009] Preferably, the counterweight liquid contained in the strip-shaped storage bag is water.
[0010] Preferably, the strip-shaped liquid storage bag is made of a wear-resistant material.
[0011] Preferably, the fluid control device includes a water pump, which is connected to the end of the strip-shaped liquid storage bag away from the pipe jacking machine.
[0012] Preferably, a system platform is also provided, which is electrically connected to the water pump, the internal sensor assembly, and the external sensor assembly.
[0013] Preferably, the internal sensor assembly includes a plurality of first displacement sensors and a plurality of first force sensors, wherein the plurality of first displacement sensors and first force sensors are fixedly connected to the bottom inner side of the pipe and are evenly distributed along the axis of the pipe.
[0014] Preferably, the external sensor assembly includes a plurality of second displacement sensors and a plurality of second force sensors, wherein the plurality of second displacement sensors and second force sensors are fixedly connected to the outer wall of the pipe and are evenly distributed along the axis of the pipe.
[0015] Preferably, a plurality of the second displacement sensors and the second force sensors are arranged at intervals around the outer wall of the pipe.
[0016] Compared with the prior art, the present invention has the following advantages and technical effects:
[0017] 1. Compared to external counterweights, the anti-buoyancy device of this invention, by placing a strip-shaped liquid storage bag inside the pipeline, effectively increases the pipeline's self-weight through internal counterweights, counteracting the effect of buoyancy and directly enhancing the pipeline's stability, thereby preventing the pipeline from floating or shifting due to buoyancy. Unlike external counterweights, internal counterweights do not require consideration of additional external forces, allowing for more precise control of the pipeline's balance and effectively avoiding potential risks caused by uneven external counterweights or construction errors.
[0018] 2. The liquid level in the strip-shaped storage bag can be adjusted as needed to ensure pipeline stability, and it is also very environmentally friendly during subsequent disposal. The removal process of the strip-shaped storage bag is simple, does not cause environmental pollution, meets the green and environmentally friendly requirements of modern construction, and has a wide range of applications. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the strip-shaped liquid storage bag of the anti-buoyancy device of this utility model in the state of not being filled with water;
[0021] Figure 2 This is a schematic diagram of the water-filled state of the strip-shaped liquid storage bag of the anti-buoyancy device of this utility model;
[0022] The components include: 1. Strip-shaped liquid storage bag; 2. Pipeline; 3. Pipe jacking machine; 4. First displacement sensor; 5. First force sensor; 6. Second displacement sensor; 7. Second force sensor; 8. Water pump; 9. System platform; 10. Soil layer. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0025] Reference Figures 1-2This utility model provides a flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environments, comprising:
[0026] The liquid storage unit includes a strip-shaped liquid storage bag 1, which is installed inside the pipe 2 and is used to hold the weighing liquid. One end of the strip-shaped liquid storage bag 1 is fixedly connected to the pipe jacking machine 3, and the other end of the strip-shaped liquid storage bag 1 is connected to a fluid control device for pumping liquid into the strip-shaped liquid storage bag 1.
[0027] The monitoring unit includes an internal sensor assembly and an external sensor assembly, which are respectively installed on the outer wall of the pipe 2 and the inner wall of the pipe 2.
[0028] The strip-shaped liquid storage bag 1 moves within the pipe 2 as the pipe jacking machine 3 advances, thus being positioned at the bottom of the pipe 2 to form a continuous counterweight belt. Under the pumping action of the fluid control equipment, a certain amount of liquid is filled into the strip-shaped liquid storage bag 1. The gravity of the liquid increases the weight of the pipe 2, thereby resisting buoyancy and preventing the pipe 2 from floating. The main function of the internal and external sensor components is to detect the buoyancy and upward displacement of the pipe 2 in a three-dimensional manner, providing a basis for the amount of counterweight liquid pumped into the strip-shaped liquid storage bag 1 by the fluid control equipment. Overall, this utility model, by placing the strip-shaped liquid storage bag inside the pipe and effectively increasing the self-weight of the pipe through internal counterweight, counteracts the effect of buoyancy, directly enhancing the stability of the pipe, thereby preventing the pipe from floating or displacing due to buoyancy. It can more accurately control the balance of the pipe and effectively avoid potential risks caused by uneven external counterweight or construction errors.
[0029] The scheme was further optimized so that the counterweight liquid contained in the strip-shaped liquid storage bag 1 is water.
[0030] Water is chosen as the counterweight liquid because it is readily available during construction, has low cost and is easy to operate, and is also very environmentally friendly in the later stages of treatment.
[0031] Meanwhile, after water is introduced into pipe 2, the weight of the strip-shaped storage bag 1 will approach zero due to the buoyancy of the water in pipe 2, allowing divers to easily pull it out. This method is convenient and quick, effectively saving labor costs and time. It achieves significant economic benefits and brings higher cost-effectiveness to the project.
[0032] The design was further optimized by using a wear-resistant material to make the strip-shaped liquid storage bag 1.
[0033] The strip-shaped liquid storage bag 1 is made of a smooth, lightweight and wear-resistant material, which can improve working stability and prevent the workload of the pipe jacking machine 3 from increasing excessively.
[0034] The scheme is further optimized. The fluid control equipment includes a water pump 8, which is connected to the end of the strip-shaped liquid storage bag 1 that is away from the pipe jacking machine 3.
[0035] The scheme is further optimized by setting up a system platform 9, which is electrically connected to the water pump 8, the internal sensor assembly, and the external sensor assembly.
[0036] The system platform 9 can receive monitoring data from the internal and external sensor components in real time and control the operation of the water pump 8 through intelligent analysis.
[0037] Further optimization of the scheme: the internal sensor assembly includes several first displacement sensors 4 and several first force sensors 5. The several first displacement sensors 4 and first force sensors 5 are fixedly connected to the bottom of the inner side of the pipe 2 and are evenly distributed along the axis of the pipe 2.
[0038] The first displacement sensor 4 can monitor the buoyancy of the pipe 2, and the first force sensor 5 monitors the change in buoyancy by monitoring the force exerted on the bottom wall of the pipe 2 by the water outside the pipe 2.
[0039] Further optimization of the scheme: the external sensor assembly includes several second displacement sensors 6 and several second force sensors 7. The several second displacement sensors 6 and second force sensors 7 are fixedly connected to the outer wall of the pipe 2 and are evenly distributed along the axis of the pipe 2.
[0040] The main function of the second displacement sensor 6 is to monitor the upward displacement of the pipe 2, and the main function of the second force sensor 7 is to directly monitor the buoyancy force on the pipe 2.
[0041] To further optimize the scheme, several second displacement sensors 6 and second force sensors 7 are arranged circumferentially around the outer wall of pipe 2.
[0042] By arranging sensors at intervals, the sensors can be distributed on the outer wall of pipe 2, making the monitoring effect more three-dimensional and accurately monitoring whether pipe 2 is floating and the buoyancy it experiences in real time.
[0043] The working process of this embodiment is as follows:
[0044] As construction progresses, the first displacement sensor, first force sensor, second displacement sensor, and second force sensor, arranged along the axis of pipeline 2, monitor the stress and displacement of pipeline 2 in real time and upload the data to system platform 9. System platform 9 combines the excavation length of pipe jacking machine 3, parameter changes in soil layer 10, burial depth of pipe jacking tunnel, water level changes, and information such as pipeline size and materials to perform comprehensive analysis and anti-buoyancy calculations. It also considers factors such as the unit weight of different soil layers, the fluidity of groundwater, and pressure differences inside and outside the tunnel to dynamically control the start-up and operating rate of water pump 8. After water pump 8 starts operating, the strip-shaped liquid storage bag 1 is gradually filled with water for water counterweight.
[0045] As the tunneling progresses, the properties and pressure distribution of the soil layer 10 will change, directly affecting buoyancy and pipeline stability. By continuously analyzing these influencing factors using existing equipment (not shown in the figure), the system platform 9 can calculate the optimal operating rate of the water pump 8 to prevent instability in the pipeline 2 due to buoyancy issues.
[0046] In this embodiment, the calculation principle of system platform 9 adopts the method of only considering the anti-buoyancy effect of the overlying soil layer 10 within the pipe diameter range on the pipe, and the following formula is used for calculation:
[0047] The anti-buoyancy effect per unit length of pipe due to its own weight is:
[0048] W = π(R) 2 -r 2 )γ c (1)
[0049] In the formula: γc is the pipe specific weight; R is the outer diameter of the pipe; and r is the inner diameter of the pipe.
[0050] The buoyancy resistance effect of the overlying soil:
[0051] G 土 =2γ s hR (2)
[0052] In the formula: γs is the buoyant unit weight of the soil; h is the burial depth of the pipeline.
[0053] The buoyant force per unit length of pipe is equal to the weight of the water displaced by the pipe.
[0054] F b =πR 2 γ w (3)
[0055] In the formula: γw is the specific weight of water.
[0056] The amount of water required for a water storage unit per unit length of pipe is:
[0057]
[0058] In the formula: Fs is the anti-buoyancy stability safety factor.
[0059] All of the above parameters can be obtained through geotechnical tests before construction.
[0060] Using the above formula, the system platform 9 can calculate the amount of counterweight water required for the strip-shaped liquid storage bag 1 per unit length of the pipe 2 at any burial depth, and achieve dynamic and stable adjustment through the inherent power parameters of the water pump 8.
[0061] Meanwhile, system platform 9 will also make corresponding adjustments based on the tunneling rate of pipe jacking machine 3 to ensure stability during the tunneling process. Changes in the tunneling rate may cause fluctuations in the pressure of soil layer 10, thereby affecting the position of pipeline 2 and the counterweight water volume of strip-shaped liquid storage bag 1. To cope with this situation, system platform 9 will update the coordination scheme between tunneling rate and equipment operating rate in real time to maintain pipeline stability. Whenever the system detects that pipeline 2 may deviate due to buoyancy, it will automatically adjust the speed of water pump 8 to ensure that pipeline 2 advances steadily according to design requirements and prevent unnecessary buoyancy risks.
[0062] After all construction steps were completed, water was first introduced into pipe 2. Once the water flow reached a stable state, divers used the principle that the weight of the strip-shaped liquid storage bag 1 was almost zero under buoyancy to remove it from pipe 2. The entire process of removing the water bag was both efficient and safe, effectively avoiding interference with the construction environment and ultimately enabling the water intake pipeline to be successfully put into use.
[0063] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0064] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. A flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environments, characterized in that... ,include: The liquid storage unit includes a strip-shaped liquid storage bag (1), which is installed inside the pipe (2) and is used to hold the weighing liquid. One end of the strip-shaped liquid storage bag (1) is fixedly connected to the pipe jacking machine (3), and the other end of the strip-shaped liquid storage bag (1) is connected to a fluid control device for pumping liquid into the strip-shaped liquid storage bag (1). The monitoring unit includes an internal sensor assembly and an external sensor assembly, which are respectively disposed on the outer wall of the pipe (2) and the inner wall of the pipe (2).
2. The flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environment according to claim 1, characterized in that: The counterweight liquid contained in the strip-shaped storage bag (1) is water.
3. The anti-buoyancy device for flexible distributed pipelines in shallow-cover, high-water-pressure environments during pipe jacking construction according to claim 1, characterized in that: The strip-shaped liquid storage bag (1) is made of wear-resistant material.
4. The anti-buoyancy device for flexible distributed pipelines in shallow-cover, high-water-pressure environments during pipe jacking construction according to claim 1, characterized in that: The fluid control device includes a water pump (8), which is connected to the end of the strip-shaped liquid storage bag (1) away from the pipe jacking machine (3).
5. The flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environment according to claim 4, characterized in that: A system platform (9) is also provided, which is electrically connected to the water pump (8), the internal sensor assembly and the external sensor assembly.
6. The anti-buoyancy device for flexible distributed pipelines in shallow-cover, high-water-pressure environments during pipe jacking construction according to claim 1, characterized in that: The internal sensor assembly includes several first displacement sensors (4) and several first force sensors (5). The several first displacement sensors (4) and first force sensors (5) are fixedly connected to the bottom of the inner side of the pipe (2) and are evenly distributed along the axis of the pipe (2).
7. The flexible distributed pipeline anti-buoyancy device for pipe jacking construction in shallow soil and high water pressure environment according to claim 1, characterized in that: The external sensor assembly includes several second displacement sensors (6) and several second force sensors (7). The several second displacement sensors (6) and second force sensors (7) are fixedly connected to the outer wall of the pipe (2) and are evenly distributed along the axis of the pipe (2).
8. The anti-buoyancy device for flexible distributed pipelines in shallow-cover, high-water-pressure environments during pipe jacking construction according to claim 7, characterized in that: Several second displacement sensors (6) and second force sensors (7) are arranged circumferentially around the outer wall of the pipe (2).