Method for laying optical cable along outside of water pipeline

Abstract

The invention relates to the technical field of optical cable laying engineering, in particular to a method for laying an optical cable along the outside of a water delivery pipeline, an inner spiral HDPE silicon core pipe is pre-buried in a concrete layer between a water delivery steel pipe and a shield segment to serve as a laying channel of the optical cable, and a GYFY optical cable is laid in the inner spiral HDPE silicon core pipe by adopting a water floating laying method. In the laying process, the GYFY optical cable is in a suspended state in the inner spiral HDPE silicon core pipe, and the whole laying process is carried out outside the water conveying steel pipe. The communication problem of key nodes along the long-distance underground water delivery project can be solved, the problem that the structure of the water delivery pipeline is affected when the optical cable is laid and led out along the water delivery pipeline is solved, and one-time long-distance uninterrupted water floating method optical cable laying is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical cable laying engineering, and particularly relates to a method for laying an optical cable outside a water conveyance pipeline. Background Art

[0002] At present, the water conveyance lines of large-scale water diversion projects are long, and some areas passed by individual projects are densely populated. Therefore, some projects adopt the method of laying water conveyance pipelines deep underground throughout the whole process or partially adopt the method of laying underground pipelines deep. Buildings such as pumping stations, maintenance wells, maintenance drainage pump rooms, flood control maintenance gates, etc. will be set on the water conveyance line. In order to realize the communication between various buildings on the water conveyance line, a dedicated optical fiber communication channel needs to be set up, so as to realize functions such as automatic control and intelligent control of the project water conveyance system, video monitoring, computer network, voice communication, etc.

[0003] Laying an optical cable along a deeply buried underground water conveyance pipeline needs to solve a series of technical problems. Laying an optical cable along a water conveyance pipeline includes two methods: laying inside the water conveyance pipeline and laying outside the water conveyance pipeline. Most of the water conveyance pipelines of the project are in the pressurized section. When laying the optical cable inside the water conveyance pipeline, the optical cable needs to pass through the water conveyance pipeline at the optical cable outlet point, which affects the structural integrity of the water conveyance pipeline and involves the problem of sealing and water stop of the water conveyance pipeline. The maximum water pressure inside the pipeline can reach dozens or even more than one hundred meters of water column. Once the seal at the position where the optical cable passes through the water conveyance pipeline has a problem, the water inside the water conveyance pipeline will overflow, which may affect water use, the project and personnel safety. Laying an optical cable outside the water conveyance pipeline does not affect the inner lining of the water conveyance pipeline, but manholes cannot be set, which involves the problem of laying a long distance at one time. For the optical cable laying scheme outside the water conveyance pipeline, the construction difficulty is great, and the construction technology and operating procedures need to be studied emphatically. Under the condition of ultra-long distance laying, a mature optical cable product that meets the above laying environment needs to be studied, and targeted research and product selection or design need to be carried out. In addition, the service life of the optical fiber is about 25 years, and the design life of most underground water conveyance projects far exceeds 25 years. Considering that the optical cable can be replaced in the future, the selection of the optical cable protection pipe and the protection measures will also affect the success of the optical cable laying quality. Summary of the Invention

[0004] The present invention provides a method for laying an optical cable outside a water conveyance pipeline, which can solve the communication problems of key nodes along the long-distance underground water conveyance project, avoid the problem of affecting the structure of the water conveyance pipeline when the optical cable is led out along the inside of the water conveyance pipeline, and realizes the one-time long-distance uninterrupted water floating method for laying the optical cable.

[0005] To achieve the object of the present invention, the technical solution adopted is: a method for laying an optical cable along the outer side of a water conveyance pipeline, comprising: installing segment lining along the outer circumference of a water conveyance steel pipe, embedding an inner spiral HDPE silicon core pipe in the concrete layer between the water conveyance steel pipe and the segment lining as a laying channel for the optical cable, and laying a GYFY optical cable in the inner spiral HDPE silicon core pipe by the water floating laying method. During the laying process, the GYFY optical cable is in a suspended state inside the inner spiral HDPE silicon core pipe, and the whole laying process is carried out outside the water conveyance steel pipe.

[0006] As an optimized solution of the present invention, at the key nodes of the water conveyance steel pipe, the inner spiral HDPE silicon core pipe pre-embedded in the concrete layer is led out to the outside of the concrete as the starting point and the ending point of the optical cable laying. The key nodes of the water conveyance steel pipe include the starting point, the ending point and the working wells along the line.

[0007] As an optimized solution of the present invention, the water floating laying method specifically is: introducing the GYFY optical cable into the inner spiral HDPE silicon core pipe through an optical cable air blower, and a water pump and a hydraulic press providing high-pressure water flow to make the GYFY optical cable in a suspended state inside the inner spiral HDPE silicon core pipe, and the optical cable air blower pushing the GYFY optical cable forward through high-pressure gas.

[0008] As an optimized solution of the present invention, an optical cable on-line monitoring device is used to monitor the state of the GYFY optical cable in real time during the laying process.

[0009] As an optimized solution of the present invention, the monitoring process of the optical cable on-line monitoring device is: tracking the state of the optical cable in real time through optical power monitoring. When an abnormality occurs to the optical cable, an alarm is issued to start the optical time domain reflectometer detection unit, and the optical time domain reflectometer detection unit uses OTDR technology combined with a geographic information system to provide the location of the fault point; the abnormality includes a decrease or attenuation of the optical power.

[0010] As an optimized solution of the present invention, the location of the fault point can be calculated by the following formula:

[0011] x f =x 0 +dcos(θ)

[0012] y f =y 0 +dsin(θ)

[0013] Where: x f and y f are the geographical coordinates of the fault point; θ is the direction angle of the optical fiber path; the starting point coordinates of the optical fiber are (x 0 ,y 0 ); d is the distance of the fault point, c is the speed of light in vacuum, t is the time from the emission of the pulse to the reception of the reflected signal, and n is the refractive index of the optical fiber.

[0014] As an optimized solution of the present invention, an air compressor device is used to conduct a through - treatment on the inner - spiral HDPE silicon - core pipe through which the GYFY optical cable has been laid.

[0015] As an optimized solution of the present invention, the air flow rate of the optical - cable air - blowing machine and the output water flow rate of the water pump and hydraulic press are set; the water tank is connected to the water pump and hydraulic press through a water inlet pipe, and the water pump and hydraulic press inject water flow into the inner - spiral HDPE silicon - core pipe through a water outlet pipe, and a flow control valve and a flow meter are installed on the water outlet pipe.

[0016] As an optimized solution of the present invention, an injection point is provided at the end of the inner - spiral HDPE silicon - core pipe, and the injection point is used to inject water flow or gas into the pipeline of the inner - spiral HDPE silicon - core pipe.

[0017] As an optimized solution of the present invention, in the case where the optical cable needs to be replaced due to damage or aging, the water - floating method is adopted to recover the old optical cable while laying a new optical cable, and the old optical cable is used as a traction carrier to be pulled out from the pipeline, and at the same time, the new optical cable is synchronously pulled for laying.

[0018] The present invention has positive effects: 1) By designing an optical - cable laying pipeline scheme that conforms to the external environment of the water - conveying pipeline, that is, using the water - conveying steel pipe and the peripheral shield segments, and pre - embedding an inner - spiral HDPE silicon - core pipe in the concrete layer therebetween as the optical - cable laying channel, the present invention effectively avoids the problems of structural integrity and sealing and water - stopping that may be caused when the optical cable is laid along the inside of the water - conveying pipeline, and ensures the safe operation of the water - conveying pipeline;

[0019] 2) Considering factors such as construction technology and construction environment, the optical - cable laying pipeline designed by the present invention ensures the usability of the optical - cable protection pipe. The inner - spiral HDPE silicon - core pipe, as the optical - cable channel, significantly reduces the potential damage risk of the external environmental factors to the optical cable, guarantees the physical integrity and transmission performance of the optical cable, and at the same time improves the construction efficiency and safety;

[0020] 3) The present invention adopts the water - floating laying method to achieve the one - time uninterrupted laying of 6 km of optical cable in the silicon - core pipe pipeline, and this length far exceeds the laying level of similar projects. By selecting the GYFY optical cable and cooperating with the water - floating laying technology, the optical cable is in a suspended state during the laying process, greatly reducing the frictional resistance and improving the laying speed and efficiency;

[0021] 4) During the construction process of the present invention, an optical - cable on - line monitoring system is adopted to real - time monitor the risk of damage to the optical cable caused by the structural construction processes such as the transportation and welding of the steel pipe of the water - conveying pipeline and the pouring of self - compacting concrete. This measure effectively ensures the safety of the optical cable during the laying process, reduces the potential problems caused by improper construction, and at the same time, the accurate fault location also reduces the unnecessary on - site inspections and maintenance work.

[0022] 5) The application of the achievements of the present invention can significantly reduce manual labor and construction costs, and has good economic value. At the same time, the optical cable floating laying method has been successfully applied to long-distance underground water conveyance projects, filling the gap in the optical cable laying scheme for domestic similar projects, providing a new solution for the optical cable laying in long-distance underground water conveyance projects, and having broad application prospects and popularization value. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0024] Figure 1 It is a cross-sectional schematic diagram of the present invention in the water conveyance pipeline;

[0025] Figure 2 Along Figure 1 Schematic diagram of line A-A in

[0026] In the figure: 1. Shield segment, 2. Concrete, 3. Water conveyance steel pipe, 4. Inner spiral HDPE silicon core pipe, 5. GYFY optical cable, 6. Optical cable air blower, 7. Injection point, 8. Outlet pipe, 9. Water pump hydraulic press, 10. Inlet pipe, 11. Water tank, 12. Flow control valve, 13. Flow meter. SPECIFIC EMBODIMENTS

[0027] To make the objectives, technical solutions and advantages of the embodiments of this patent clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0028] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended as a limitation on the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments of the present invention.

[0030] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. For technologies, methods and devices known to those skilled in the art, they may not be discussed in detail. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other example values of the exemplary embodiments may have different values.

[0031] AsFigure 1 As shown in the figure, the present invention discloses a method for laying an optical cable along the outside of a water conveyance pipeline, which includes: embedding an inner spiral HDPE silicon core pipe 4 in the concrete layer 2 between the water conveyance steel pipe 3 and the shield segment 1 as the laying channel for the optical cable, and using the water floating laying method to lay the GYFY optical cable 5 in the inner spiral HDPE silicon core pipe 4. During the laying process, the GYFY optical cable 5 is in a suspended state inside the inner spiral HDPE silicon core pipe 4, and the whole laying process is carried out outside the water conveyance steel pipe 3. During implementation, a complete and jointless inner spiral HDPE silicon core pipe 4 is embedded in the concrete 2 between the shield segment 1 and the water conveyance steel pipe 3. The inner spiral HDPE silicon core pipe 4 is the optical cable laying channel. The GYFY optical cable 5 is laid in the inner spiral HDPE silicon core pipe 4 by the water floating laying method. The density of the GYFY optical cable 5 is approximately equal to the density of water. During the laying process, the GYFY optical cable 5 is mostly in a suspended state inside the inner spiral HDPE silicon core pipe 4. The contact area between the GYFY optical cable 5 and the inner wall of the inner spiral HDPE silicon core pipe 4 is small, and the frictional resistance during the laying process is small. The whole laying process is carried out outside the water conveyance steel pipe 3. Selecting the GYFY optical cable 5 is suitable for the water floating laying method of the optical cable.

[0032] By adopting the water floating laying method, the GYFY optical cable 5 is in a suspended state inside the inner spiral HDPE silicon core pipe 4 for most of the time, which significantly reduces the contact area between the optical cable and the inner wall of the pipeline, thereby reducing the frictional resistance during the laying process. This enables low energy consumption and high construction efficiency to be maintained even during long-distance laying. Using the inner spiral HDPE silicon core pipe 4 as the optical cable channel greatly reduces the potential damage risk to the optical cable from external environmental factors (such as soil pressure, groundwater, etc.), ensuring the physical integrity and transmission performance of the optical cable. Laying the optical cable directly in the HDPE silicon core pipe outside the existing water conveyance steel pipe 3 can not only effectively reduce environmental impacts, achieve effective resource allocation, reduce costs, but also significantly improve construction efficiency and safety.

[0033] At the key nodes of the water conveyance steel pipe 3, the inner spiral HDPE silicon core pipe 4 pre-embedded in the concrete layer 2 is led out to the outside of the concrete as the starting point and ending point of the optical cable laying. The key nodes of the water conveyance steel pipe 3 include the starting point, the ending point, and the working wells along the line. Through this setting, the installation, inspection, maintenance, and replacement of the optical cable become easier. When maintenance or troubleshooting of the optical cable is required, there is no need for large-scale excavation or destruction of the original structure, thereby reducing the service interruption time. The optical cable laying work can be carried out at different key nodes respectively, which is conducive to segmented construction and management, improving the flexibility and controllability of the overall project. For long-distance pipelines, especially in cases where the terrain is complex or changeable, this method can better adapt to the actual on-site situation and ensure the smooth progress of the project.

[0034] As Figure 2As shown in the figure, the specific method of water floating laying is as follows: The GYFY optical cable 5 is introduced into the inner spiral HDPE silicon core pipe 4 through the optical cable air blower 6. The water pump and hydraulic press 9 provides high-pressure water flow, so that the GYFY optical cable 5 is in a suspended state in the inner spiral HDPE silicon core pipe 4. The optical cable air blower 6 pushes the GYFY optical cable 5 forward through high-pressure gas. Set the air flow rate of the optical cable air blower 6 and the output water flow rate of the water pump and hydraulic press 9; The water tank 11 is connected to the water pump and hydraulic press 9 through the water inlet pipe 10. The water pump and hydraulic press 9 injects water flow into the inner spiral HDPE silicon core pipe 4 through the water outlet pipe 8. A flow control valve 12 and a flow meter 13 are installed on the water outlet pipe 8. An injection point 7 is provided at the end of the inner spiral HDPE silicon core pipe 4. The injection point 7 is used to inject water flow or gas into the pipeline of the inner spiral HDPE silicon core pipe 4. During the laying process, most of the GYFY optical cable 5 is in a suspended state in the inner spiral HDPE silicon core pipe 4. After the GYFY optical cable 5 is laid to the other end of the inner spiral HDPE silicon core pipe 4, the water pump and hydraulic press 9 is turned off. After the water inside the inner spiral HDPE silicon core pipe 4 is drained, the flow control valve 12 is closed to form a complete laying scheme for the optical cable outside the water conveyance pipeline.

[0035] Flexibly adjust the air flow rate and water flow rate according to the actual situation to adapt to different pipeline lengths and terrain conditions, and ensure the construction quality and efficiency. This method is especially suitable for long-distance laying tasks and can complete large-scale optical cable laying work without interruption.

[0036] Equipment parameters:

[0037] 1) Water pump and hydraulic press:

[0038] Maximum flow rate: 100 L / min;

[0039] Maximum output pressure: 34 bar.

[0040] 2) Optical cable air blower:

[0041] Maximum output flow rate: 17 L / min;

[0042] Maximum output pressure: 70 bar;

[0043] Maximum air pressure: 12 bar;

[0044] Maximum water pressure: 25 bar.

[0045] 3) Laying requirements:

[0046] Minimum input pressure (bar): 1.7

[0047] Minimum water volume (L / min): 10.2

[0048] Minimum water speed (m / min): 13.3

[0049] The parameters used in actual laying need to be adjusted according to the actual situation of the construction site. Flexibly adjust the output parameters of the water pump hydraulic press and the optical cable air blowing machine according to the specific situation of the construction site (such as pipeline length, terrain changes, etc.) to ensure the best construction effect. Whether in long-distance or complex terrain conditions, this method can provide effective solutions to ensure the smooth progress of construction. By precisely controlling the water flow and air flow, the GYFY optical cable is in a suspended state in the HDPE silicon core pipe, reducing the frictional resistance and increasing the laying speed.

[0050] Use an optical cable on-line monitoring device to monitor the status of the GYFY optical cable (5) during the laying process in real time. The monitoring process of the optical cable on-line monitoring device is as follows: Real-time track the status of the optical cable through optical power monitoring. When an abnormality occurs in the optical cable, an alarm is issued to start the optical time domain reflectometer detection unit. The optical time domain reflectometer detection unit uses OTDR technology combined with a geographic information system to provide the location of the fault point; Abnormalities include a decrease or attenuation of the optical power.

[0051] The location of the fault point can be calculated by the following formula:

[0052] x f = x 0 + dcos(θ)

[0053] y f = y 0 + dsin(θ)

[0054] Where: x f and y f are the geographical coordinates of the fault point; θ is the direction angle of the optical fiber path; The starting coordinates of the optical fiber are (x 0 , y 0 ); d is the distance of the fault point, c is the speed of light in a vacuum, t is the time from the emission of the pulse to the reception of the reflected signal, and n is the refractive index of the optical fiber.

[0055] The optical cable on-line monitoring system adopted during the construction process is to select optical fibers with specific core numbers from the laid optical cable, add a light source at one end to send optical signals, and perform optical power monitoring at the other end. When the optical power drops to a certain threshold value or there is a large attenuation, an alarm is generated. The optical cable monitoring device starts the optical time domain reflectometer (OTDR) detection unit according to the alarm information from the optical power monitoring unit to detect the service optical path used by users in a timely manner, and compares and analyzes the obtained curve data with the set reference curve data, and combines the geographic information system to give the precise fault point, which is convenient for maintenance personnel to eliminate the faults of the optical cable in a timely manner.

[0056] Once an anomaly is detected, the OTDR detection unit is automatically activated to utilize OTDR technology and Geographic Information System (GIS) to provide the precise location of the fault point, facilitating timely handling by maintenance personnel. During the laying process of the optical cable, the status of the optical cable is continuously monitored to ensure that each section of the optical cable is in the best working condition and to avoid potential problems caused by improper construction. Precise fault location reduces unnecessary on-site inspections and repair work.

[0057] When adopting the water-floating laying method to replace the optical cable solution, the technical requirements and construction steps are similar to those of laying the optical cable. It is necessary to pay special attention to the trial connection work of the inner spiral HDPE silicon core pipe 4. Use an air compressor device to penetrate the silicon core pipe through which the optical cable has been laid, mainly to remove accumulated water and other obstacles in the pipe; when there is water in the silicon core pipe, it will play a blocking role. The water flowing into this section of the pipe during the water-floating laying method will compress the air in the pipe into a high-pressure area. While increasing the water pressure, the air pressure in the pipe will also inevitably increase, posing a risk of pipe bursting. After the pipe is penetrated, connect the main equipment in the correct way according to the water-floating laying method of the optical cable; start equipment such as water pumps, hydraulic presses, and optical cable air blowers; use the water-floating method to recover the old optical cable while laying the new optical cable. Use the old optical cable as a traction carrier to extract it from the pipe and simultaneously tow the new optical cable for laying. The end of the old optical cable is wound onto the cable reel with a cable support until the recovery is completed. Using the old optical cable as a traction carrier reduces the potential risks brought by direct operation and improves the construction safety. By combining the water-floating laying method with an optical cable air blower, the new optical cable can enter the pipe quickly and smoothly, significantly shortening the construction time and greatly improving the overall construction efficiency. Using the old optical cable as a traction medium not only solves the problem of recovering the old optical cable but also provides convenience for laying the new optical cable, realizing the effective utilization of resources. Compared with laying a new independent pipe system, using the existing structure can significantly reduce the demand for new materials and lower the overall construction cost.

[0058] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for laying optical cables outside a water pipeline, characterized in that: include: An inner spiral HDPE silicon core tube (4) is pre-buried in a concrete layer (2) between a water delivery steel pipe (3) and a shield segment (1) as a laying channel for an optical cable. A water floating laying method is used to lay a GYFY optical cable (5) in the inner spiral HDPE silicon core tube (4). During the laying process, the GYFY optical cable (5) is in a suspended state inside the inner spiral HDPE silicon core tube (4). The entire laying process is carried out outside the water delivery steel pipe (3).

2. A method for laying optical cables outside a water pipeline according to claim 1, characterized in that: At the key nodes of the water delivery steel pipe (3), the inner spiral HDPE silicon core pipe (4) pre-buried in the concrete layer (2) is led out to the outside of the concrete to serve as the starting point and end point of the optical cable laying. The key nodes of the water delivery steel pipe (3) include the starting point, the end point and the working wells along the line.

3. A method for laying optical cables outside a water pipeline according to claim 2, characterized in that: The water floating laying method is specifically as follows: the GYFY optical cable (5) is introduced into the inner spiral HDPE silicon core tube (4) through the optical cable air blowing machine (6); a water pump hydraulic machine (9) provides high-pressure water flow to make the GYFY optical cable (5) in a suspended state in the inner spiral HDPE silicon core tube (4); and the optical cable air blowing machine (6) pushes the GYFY optical cable (5) forward through high-pressure gas.

4. A method for laying optical cables outside a water pipeline according to claim 3, characterized in that: The optical cable online monitoring equipment is used to monitor the status of the GYFY optical cable (5) in real time during the laying process.

5. A method for laying optical cables outside a water pipeline according to claim 4, characterized in that: The monitoring process of the optical cable online monitoring equipment is: real-time tracking of the optical cable status through optical power monitoring. When an abnormality occurs in the optical cable, an alarm is issued to start the optical time domain reflectometer detection unit. The optical time domain reflectometer detection unit uses OTDR technology combined with a geographic information system to provide the location of the fault point; the abnormality includes a decrease or attenuation of optical power.

6. A method for laying optical cables outside a water pipeline according to claim 5, characterized in that: The fault point location can be calculated using the following formula: x f =x0+dcos(θ) y f =y0+dsin(θ) Where: x f and f is the geographical coordinate of the fault point; θ is the direction angle of the fiber path; the starting coordinate of the fiber is (x0, y0); d is the distance from the fault point, c is the speed of light in a vacuum, t is the time from the emission of the pulse to the receipt of the reflected signal, and n is the refractive index of the optical fiber.

7. A method for laying optical cables outside a water pipeline according to claim 4, characterized in that: An air compressor is used to perform a through-treatment on an inner spiral HDPE silicon core tube (4) through which a GYFY optical cable (5) has been placed.

8. A method for laying optical cables outside a water pipeline according to claim 4, characterized in that: The air flow rate of the optical cable air blowing machine (6) and the output water flow rate of the water pump hydraulic machine (9) are set; the water tank (11) is connected to the water pump hydraulic machine (9) through the water inlet pipe (10); the water pump hydraulic machine (9) injects water into the inner spiral HDPE silicon core tube (4) through the water outlet pipe (8); and the water outlet pipe (8) is installed with a flow control valve (12) and a flow meter (13).

9. A method for laying optical cables outside a water pipeline according to claim 4, characterized in that: An injection point (7) is arranged at the end of the inner spiral HDPE silicon core tube (4), and the injection point (7) is used to inject water or gas into the pipeline of the inner spiral HDPE silicon core tube (4).

10. A method for laying optical cables outside a water pipeline according to claim 4, characterized in that: In the case where optical cables need to be replaced due to damage or aging, the water floating method is used to recover the old optical cables while laying new optical cables. The old optical cables are used as traction carriers to be pulled out of the pipeline, and the new optical cables are simultaneously pulled for laying.

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