Protection method for underground flexible pipeline

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By suspending protective frames along the outer edge of the construction pit, the underground flexible pipeline is lifted and protected, and combined with settlement inspection and monitoring, the problem of uneven force in the repair process is solved, and the safety protection of the pipeline and construction cost are achieved. reduce.

CN119412542APending Publication Date: 2025-02-11THE 5TH ENGINEERING CO LTD OF CHINA RAILWAY CONSTRUCTION BRIDGE ENGINEERING BUREAU GROUP +1

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Patent Information

Application Number: CN202411422452.9
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-10-12
Publication Date: 2025-02-11

AI Technical Summary

Technical Problem

When repairing underground drainage pipes, flexible pipes are prone to uneven stress due to improper support, resulting in dangerous accidents such as pipeline rupture, breakage, leakage or natural gas leakage.

Method used

By suspending protective frames along the outer edge of the construction pit, the underground flexible pipeline is lifted and protected, combined with settlement inspection and monitoring, we ensure that the pipeline is subjected to uniform stress during construction and avoid rupture and leakage.

Benefits of technology

This method effectively prevents the cracking and leakage of flexible pipes during construction, reduces construction costs, and improves the safety and efficiency of construction.

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Abstract

The invention discloses a protection method for underground flexible pipelines. The protection method comprises the following steps that S1, the distribution condition of the underground flexible pipelines in a construction range is determined; s2, in the process of excavating the construction pit, protective excavation is conducted on the underground flexible pipeline; s3, a suspension protection frame is erected above the construction pit, and suspension protection is sequentially carried out in a segmented mode through the suspension protection frame according to the exposure condition of the underground flexible pipeline; and S4, settlement monitoring is conducted on the periphery of the underground flexible pipeline. The hanging protection for the underground flexible pipeline does not occupy too much construction space, so that the normal development of construction operation is not influenced; the suspension distance can be adjusted according to the pipe network property, the material and the old and new aging degree of the underground flexible pipeline, and targeted protection is carried out; the protection effect is guaranteed, material consumption is reduced, the construction cost is reduced, settlement around the pipeline is monitored, and the acting force of soil on the line pipe can be effectively detected so as to control the deformation degree of the pipeline.

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Description

Technical Field

[0001] The invention relates to the technical field of underground flexible pipeline protection, and in particular to a protection method for underground flexible pipelines. Background Art

[0002] As the scale of cities expands, the underground pipe network in urban areas becomes more and more complex. The water supply and drainage pipes in urban areas are a vital part of the water supply and drainage system. They are used to transport and distribute industrial and domestic water, and collect, transport and discharge industrial wastewater, domestic sewage and rainwater. It is also one of the first pipes buried underground with the development of the city. Due to its long service life, some pipes have been damaged. In order to ensure the normal operation of the drainage system, it is necessary to repair it. When repairing underground drainage pipes, it is necessary to dig up the soil to expose the underground drainage pipes. This process will also expose other unrelated pipes. In order to prevent these unrelated wire pipes from being damaged, generally only scaffolding is used to support and protect the suspended unrelated wire pipes. If the unrelated pipe is a rigid pipe made of concrete, it can be protected by only using scaffolding support to prevent it from being suspended because of its high strength. However, for flexible pipes such as gas pipelines or cables that transport natural gas, only using scaffolding support is easy to cause uneven force on the flexible pipe due to improper support, causing increased internal stress in the flexible pipe, which in turn causes the flexible pipe to rupture and break, and dangerous accidents such as leakage or natural gas leakage. Summary of the invention

[0003] The purpose of the present invention is to provide a protection method for underground flexible pipelines with good protection effect and low construction intensity.

[0004] The present invention is implemented by the following technical solution: A protection method for underground flexible pipelines, comprising the following steps: Step S1: Determine the distribution of underground flexible pipelines within the construction scope; Step S2: During the process of digging the construction pit, protective excavation is performed on the underground flexible pipeline; Step S3: erecting a suspension protection frame above the construction pit, and performing suspension protection in sections in sequence according to the exposure of the underground flexible pipeline through the suspension protection frame; Step S4: Perform settlement inspection and monitoring around the underground flexible pipeline.

[0005] In order to better implement the method of the present invention, further, the specific process of determining the distribution of flexible pipes in the construction site in step S1 is as follows: Step S11: Acquire the data of underground flexible pipelines within the construction scope, carry out on-site briefing work for the construction of underground flexible pipelines, and form briefing records or image data; Step S12: Conducting geophysical exploration of underground flexible pipelines within the construction scope and forming a geophysical exploration report; Step S13: Organizing manual excavation of a test pit to check the direction and depth of the underground flexible pipeline; Step S14: prepare an investigation report of the underground flexible pipeline, and indicate the location of the underground flexible pipeline according to the investigation report and on-site conditions, and erect safety warning signs.

[0006] In order to better implement the method of the present invention, further, in step S11, the information of underground flexible pipelines within the construction scope is obtained through the urban construction archives.

[0007] In order to better implement the method of the present invention, further, the specific process of organizing manual excavation of the test pit in step S13 to check the direction and depth of the underground flexible pipeline is as follows: Step S131: Trench excavation must be done manually with a shovel, and a pickaxe is not allowed. A cross-shaped exploration pit is set every 5m within the excavation support range of the construction site. The excavation width and length of the exploration pit cover the entire foundation pit construction range. The exploration pit depth is 2m to 3m, and the slope is 1:1.5 to 1:0.75. When the soil quality changes, the covering should be removed with a wooden chisel to ensure that the underground flexible pipeline is not damaged; Step S132: During the excavation process, the scope is gently widened to find out the type, specification, number, direction and depth of the pipeline and record them. At the same time, large pieces of stone debris and soil in the surrounding area should be cleared, and the bottom of the exposed flexible pipeline should be supported with fine soil to prevent it from hanging in the air. The flexible pipeline should be covered with wooden boards; Step S133: All underground flexible pipes found within the road shoulder and rainwater square ditch are cleaned and exposed to the ground without leaving any dead corners, and the path and depth of the underground flexible pipes are explored.

[0008] In order to better implement the method of the present invention, further, the method for clearly indicating the position of the underground flexible pipeline in step S14 is: at least one of spraying red paint, pulling warning tape, and inserting colorful flags.

[0009] In order to better implement the method of the present invention, further, the suspended protective frame in step S3 includes support platforms fixed on both sides to the edges of the construction pit, support rods above the construction pit are fixed between the support platforms, and a number of traction ropes are arranged on the support rods. The lower part of the traction rope is fixed to the underground flexible pipe, and the underground flexible pipe is suspended at the lower part of the support rod by the traction rope. A number of support frames are also arranged at the lower part of the support rod, one end of the support frame is fixed to the bottom of the construction pit, and the other end is supported at the lower part of the support rod; the support frame is located at both ends of the pipeline to be repaired in the construction pit.

[0010] In order to better implement the method of the present invention, further, in step S4, the specific process of monitoring the settlement of the surrounding area of the underground flexible pipeline is as follows: S41: Determine the reference point for settlement observation; S42: Arrange observation points for settlement observation; S43: According to the buried measuring points and measuring frequency requirements, each measuring point is measured by the pipeline settlement observation instrument and records are made step by step. The measured data are plotted as a scatter plot and regression analysis is performed. The stability of the stratum is judged according to the regression curve, and the underground flexible pipeline is measured in time. The measured data is processed and retained to 0.1mm; the pipeline settlement observation instrument includes a DSZ-2 level with a micrometer, and a linear indium steel ruler is used as a level ruler.

[0011] In order to better implement the method of the present invention, further, in the step S41, the benchmark system for building settlement observation, namely the bedrock benchmark point, is used as the starting and closing points of the pipeline settlement, and the density is to set three or more per measuring area to meet the requirements, and the benchmark point is set at a distance of 3 times the trench depth.

[0012] In order to better implement the method of the present invention, further, in the step S42, the displacement development and change law of the soil near the pipeline is monitored, and monitoring points should be arranged at important pipelines and pipeline joints within a distance range of about 1 to 2 times the trench excavation depth, and a settlement measuring point should be arranged every 5m to 15m along the extension direction of the pipeline.

[0013] In order to better implement the method of the present invention, further, in the step S4, the horizontal displacement of the pipeline located in the excavation range and parallel to the trench is monitored in particular; the pipeline horizontal displacement observation method adopts a small angle method and / or a sight line method.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: (1) The present invention suspends a protective frame on the outer edge of the construction pit to protect the underground flexible pipeline. Compared with the traditional method of using only scaffolding support protection, the suspension protection will not occupy too much construction space, thereby affecting the normal development of construction work; (2) The protection method provided by the present invention has strong operability and adaptability. The suspension protection frame can adjust the suspension spacing according to the network properties, materials and aging degree of the underground flexible pipeline, so as to provide targeted protection; (3) Compared with the traditional simple and crude support protection, the protection method provided by the present invention can reduce the use of materials while ensuring the protection effect, thereby minimizing the construction cost. In addition, by monitoring the settlement around the pipeline, it can effectively detect the force of the soil on the wire pipe to control the deformation degree of the pipeline to avoid pipeline rupture, breakage and leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the transverse cross-sectional structure of the suspension protection frame in the present invention lifting the underground flexible pipeline; Figure 2 It is a schematic diagram of the longitudinal cross-sectional structure of the suspension protection frame lifting the underground flexible pipeline in the present invention.

[0016] Among them: 101 - underground flexible pipeline, 102 - pipeline to be repaired, 103 - support platform, 104 - support rod, 105 - support frame, 106 - traction rope. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Embodiment 1: This embodiment provides a protection method for underground flexible pipelines, comprising the following steps: Step S1: Determine the distribution of underground flexible pipelines within the construction scope; Step S2: During the process of digging the construction pit, protective excavation is performed on the underground flexible pipeline; Step S3: erecting a suspension protection frame above the construction pit, and performing suspension protection in sections in sequence according to the exposure of the underground flexible pipeline through the suspension protection frame; Step S4: Perform settlement inspection and monitoring around the underground flexible pipeline.

[0020] Embodiment 2: Based on the above embodiment, this embodiment further defines the specific process of determining the distribution of flexible pipes in the construction site in step S1 as follows: Step S11: Acquire the data of underground flexible pipelines within the construction scope, carry out on-site briefing work for the construction of underground flexible pipelines, and form briefing records or image data; Step S12: Conducting geophysical exploration of underground flexible pipelines within the construction scope and forming a geophysical exploration report; Step S13: Organizing manual excavation of a test pit to check the direction and depth of the underground flexible pipeline; Step S14: prepare an investigation report of the underground flexible pipeline, and indicate the location of the underground flexible pipeline according to the investigation report and the on-site conditions, and set up a safety warning sign. The rest of this embodiment is the same as the above embodiment and will not be described in detail.

[0021] Embodiment 3: Based on the above embodiment, this embodiment further limits the step S11 to obtaining the information of underground flexible pipelines within the construction scope through the urban construction archives. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0022] Embodiment 4: Based on the above embodiment, this embodiment further defines the specific process of organizing manual excavation of the test pit in step S13 to check the direction and depth of the underground flexible pipeline as follows: Step S131: Trench excavation must be done manually with a shovel, and a pickaxe is not allowed. A cross-shaped exploration pit is set every 5m within the excavation support range of the construction site. The excavation width and length of the exploration pit cover the entire foundation pit construction range. The exploration pit depth is 2m to 3m, and the slope is 1:1.5 to 1:0.75. When the soil quality changes, the covering should be removed with a wooden chisel to ensure that the underground flexible pipeline is not damaged; Step S132: During the excavation process, the scope is gently widened to find out the type, specification, number, direction and depth of the pipeline and record them. At the same time, large pieces of stone debris and soil in the surrounding area should be cleared, and the bottom of the exposed flexible pipeline should be supported with fine soil to prevent it from hanging in the air. The flexible pipeline should be covered with wooden boards; Step S133: All underground flexible pipes found within the road shoulder and rainwater square ditch are cleaned and exposed to the ground without leaving any dead corners, and the path and depth of the underground flexible pipes are found. The rest of this embodiment is the same as the above embodiment and will not be described in detail.

[0023] Embodiment 5: Based on the above embodiment, this embodiment further defines the method of indicating the location of the underground flexible pipeline in step S14 as at least one of spraying red paint, pulling warning tape, and inserting colorful flags. The rest of this embodiment is the same as the above embodiment and will not be described in detail.

[0024] Embodiment 6: Based on the above embodiment, this embodiment further defines the structure of the suspended protection frame in step S3, such as Figure 1 , Figure 2 As shown, the suspension protection frame includes a support platform 103 fixed on the edge of the construction pit on both sides, a support rod 104 is fixed between the support platforms 103 above the construction pit, and a plurality of traction ropes 106 are arranged on the support rod 104. The lower part of the traction rope 106 is fixed to the underground flexible pipe 101, and the underground flexible pipe 101 is suspended at the lower part of the support rod 104 through the traction rope 106. The lower part of the support rod 104 is also provided with a plurality of support frames 105, one end of the support frame 105 is fixed to the bottom of the construction pit, and the other end is supported at the lower part of the support rod 104; the support frame 105 is located at both ends of the pipeline 102 to be repaired in the construction pit. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0025] Embodiment 7: Based on the above embodiment, this embodiment further defines the specific process of performing settlement detection and monitoring around the underground flexible pipeline in step S4 as follows: S41: Determine the reference point for settlement observation; S42: Arrange observation points for settlement observation; S43: According to the buried measuring points and measuring frequency requirements, each measuring point is measured by the pipeline settlement observation instrument and gradually recorded, a scatter plot is drawn for the measuring data, and regression analysis is performed, and the stability of the stratum is judged according to the regression curve, and the underground flexible pipeline is measured in time, and the processing measurement data is retained to 0.1mm; the pipeline settlement observation instrument includes a DSZ-2 level with a micrometer, and a linear indium steel ruler is used as a level ruler. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0026] Embodiment 8: Based on the above embodiment, this embodiment further defines that in step S41, the base system of building settlement observation, i.e., bedrock-type base points, is used as the starting and closing points of pipeline settlement, and the density is three or more per measurement area to meet the requirements, and the base points are set at a distance of 3 times the trench depth. The rest of this embodiment is the same as the above embodiment and will not be repeated.

[0027] Embodiment 9: Based on the above embodiment, this embodiment further defines step S42 to be implemented by monitoring the displacement development and change law of the soil near the pipeline, and the distance range is about 1 to 2 times of the trench excavation depth. Monitoring points should be arranged at important pipelines and pipeline joints, and a settlement measurement point should be arranged every 5m to 15m along the extension direction of the pipeline. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0028] Embodiment 10: Based on the above embodiment, this embodiment further defines that in step S4, for the pipeline located in the excavation range and parallel to the trench, the horizontal displacement of the pipeline is focused on monitoring; the pipeline horizontal displacement observation method adopts the small angle method and / or the sight line method. The other parts of this embodiment are the same as the above embodiment and will not be repeated.

[0029] It can be understood that the working principles and working processes of the suspension protection frame structure according to an embodiment of the present invention, such as the support platform 103 and the traction rope 106 and other components are all prior art and are well known to technicians in this field, and will not be described in detail here.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for protecting underground flexible pipelines, characterized in that: The following steps are involved: Step S1: Determine the distribution of underground flexible pipelines within the construction scope; Step S2: During the process of digging the construction pit, protective excavation is performed on the underground flexible pipeline; Step S3: erecting a suspension protection frame above the construction pit, and performing suspension protection in sections in sequence according to the exposure of the underground flexible pipeline through the suspension protection frame; Step S4: Perform settlement inspection and monitoring around the underground flexible pipeline.

2. A method for protecting underground flexible pipelines according to claim 1, characterized in that: The specific process of determining the distribution of flexible pipes in the construction site in step S1 is as follows: Step S11: Acquire the data of underground flexible pipelines within the construction scope, carry out on-site briefing work for the construction of underground flexible pipelines, and form briefing records or image data; Step S12: Conducting geophysical exploration of underground flexible pipelines within the construction scope and forming a geophysical exploration report; Step S13: Organizing manual excavation of a test pit to check the direction and depth of the underground flexible pipeline; Step S14: prepare an investigation report of the underground flexible pipeline, and indicate the location of the underground flexible pipeline according to the investigation report and on-site conditions, and erect safety warning signs.

3. A method for protecting underground flexible pipelines according to claim 2, characterized in that: In the step S11, the data of underground flexible pipelines within the construction scope are obtained through the urban construction archives.

4. A method for protecting underground flexible pipelines according to claim 2 or 3, characterized in that: The specific process of organizing manual excavation of a test pit to check the direction and depth of the underground flexible pipeline in step S13 is as follows: Step S131: Trench excavation must be done manually with a shovel, and a pickaxe is not allowed. A cross-shaped exploration pit is set every 5m within the excavation support range of the construction site. The excavation width and length of the exploration pit cover the entire foundation pit construction range. The exploration pit depth is 2m to 3m, and the slope is 1:1.5 to 1:0.

75. When the soil quality changes, the covering should be removed with a wooden chisel to ensure that the underground flexible pipeline is not damaged; Step S132: During the excavation process, the scope is gently widened to find out the type, specification, number, direction and depth of the pipeline and record them. At the same time, large pieces of stone debris and soil in the surrounding area should be cleared, and the bottom of the exposed flexible pipeline should be supported with fine soil to prevent it from hanging in the air. The flexible pipeline should be covered with wooden boards; Step S133: All underground flexible pipes found within the road shoulder and rainwater square ditch are cleaned and exposed to the ground without leaving any dead corners, and the path and depth of the underground flexible pipes are explored.

5. A method for protecting underground flexible pipelines according to claim 2 or 3, characterized in that: The method for clearly indicating the position of the underground flexible pipeline in step S14 is at least one of spraying red paint, pulling warning tape, and inserting colorful flags.

6. A method for protecting underground flexible pipelines according to claim 2 or 3, characterized in that: In step S3, the suspended protection frame comprises a support platform (103) with two sides fixed to the edge of the construction pit, a support rod (104) above the construction pit is fixed between the support platforms (103), a plurality of traction ropes (106) are arranged on the support rod (104), the lower part of the traction rope (106) is fixed to the underground flexible pipeline (101), the underground flexible pipeline (101) is suspended at the lower part of the support rod (104) through the traction rope (106), and a plurality of support frames (105) are also arranged at the lower part of the support rod (104), one end of the support frame (105) is fixed to the bottom of the construction pit, and the other end is supported at the lower part of the support rod (104); the support frame (105) is located at both ends of the pipeline (102) to be repaired in the construction pit.

7. A method for protecting underground flexible pipelines according to claim 2 or 3, characterized in that: In step S4, the specific process of monitoring the settlement of the surrounding area of the underground flexible pipeline is as follows: S41: Determine the reference point for settlement observation; S42: Arrange observation points for settlement observation; S43: According to the buried measuring points and measuring frequency requirements, each measuring point is measured by the pipeline settlement observation instrument and records are made step by step. The measured data are plotted as a scatter plot and regression analysis is performed. The stability of the stratum is judged according to the regression curve, and the underground flexible pipeline is measured in time. The measured data is processed and retained to 0.1mm; the pipeline settlement observation instrument includes a DSZ-2 level with a micrometer, and a linear indium steel ruler is used as a level ruler.

8. A method for protecting underground flexible pipelines according to claim 2 or 3, characterized in that: In step S41, the reference system for building settlement observation, namely bedrock reference points, is used as the starting and closing points of the road settlement. The density is three or more per survey area to meet the requirement, and the reference points are set at a distance of 3 times the trench depth.

9. A method for protecting underground flexible pipelines according to claim 2 or 3, characterized in that: In the step S42, the displacement development and change law of the soil near the pipeline is monitored. Monitoring points should be arranged at important pipelines and pipeline joints within a distance range of about 1 to 2 times the trench excavation depth, and a settlement measurement point should be arranged every 5m to 15m along the extension direction of the pipeline.

10. A method for protecting underground flexible pipelines according to claim 7, characterized in that: In the step S4, the horizontal displacement of the pipeline located in the excavation range and parallel to the trench is monitored in particular; the pipeline horizontal displacement observation method adopts a small angle method and / or a sight line method.