Laying method of monitoring optical cable on water taking and draining pipeline

Abstract

The invention discloses a method for laying a monitoring optical cable on a water taking and draining pipeline. The method comprises the following steps: a pipeline surface polishing step: firstly, marking an optical cable pasting area at a corresponding optical cable mounting position on the surface of each pipeline; polishing an optical cable pasting area; the polished optical cable pasting area is wiped clean; marking an optical cable pasting line in the optical cable pasting area; a primer coating step: coating 3M primer on an optical cable pasting area by a coating operator; an optical cable pasting step: pasting an optical cable back adhesive tearing film on the 3M primer within 5 minutes after the 3M primer is painted by a pasting operator; rolling the optical cable by using a roller; and a glue sealing and reinforcing step: firstly wiping the surfaces of the optical cables, then uniformly smearing epoxy resin glue between the two side surfaces of each optical cable and the surface of the pipeline, and then pressing a glass fiber adhesive tape covering the surfaces of the optical cables and the epoxy glue to enable the surface of the epoxy glue to be an inclined plane. The construction quality of the optical cable is ensured.

Description

Technical Field

[0001] The invention relates to a method for laying a monitoring optical cable on a water intake and drainage pipeline. Background Art

[0002] Drainage pipelines play a crucial role in nuclear power plant operations, serving as a fundamental foundation for power generation. They must not only meet nuclear safety, structural strength, and seismic requirements, but also ensure the isolation and protection of special media such as radioactive wastewater. With the increasing development of nuclear power projects, drainage pipelines are becoming increasingly long, requiring the installation of maintenance valve wells at intersections. These pipelines also require fiber optic monitoring cables to provide real-time monitoring of drainage pipeline operations and ensure immediate visibility of their operational status. Therefore, ensuring the quality of the monitoring cables remains a pressing issue for construction companies. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a method for laying monitoring optical cables on drainage pipes, which can ensure the construction quality of the optical cables and make the use of the optical cables better.

[0004] The objectives of the present invention are achieved by providing a method for laying monitoring optical cables on water supply and drainage pipelines, comprising laying five optical cables on the outer surfaces of each of six pipelines buried in a pipeline base trench, bypassing and passing through valve wells; one optical cable is laid at a position 90° to the horizontal centerline of each pipeline, two optical cables are correspondingly located at positions 45° and 135° to the horizontal centerline, and two optical cables are correspondingly located at positions 195° and 345° to the horizontal centerline;

[0005] The laying method includes the following steps: grinding the pipeline surface, applying primer, pasting the optical cable, sealing and reinforcing, processing the bends, processing the anchoring points, winding the optical cable around the well and passing the optical cable through the well; wherein,

[0006] When performing the pipeline surface polishing step, first mark the cable pasting area on the surface of each pipeline corresponding to the installation position of the five optical cables; then use a polishing wheel to polish along the marked cable pasting area; then use a dust-free wipe dipped in anhydrous ethanol to wipe the polished cable pasting area clean; then mark the center line of the cable pasting area, that is, the cable pasting line;

[0007] During the primer application step, the glue applicator applies 3M primer to the cable pasting area along the cable pasting route;

[0008] During the step of pasting the optical cable, the pasting operator must paste the optical cable adhesive film onto the 3M primer within 5 minutes after the glue coating operator has applied the 3M primer. After the optical cable is pasted, use a roller to roll the optical cable.

[0009] During the glue sealing reinforcement step, first wipe the surface of the optical cable clean with a dust-free wipe dipped in anhydrous ethanol. Then, evenly apply epoxy resin glue between the two sides of each optical cable and the surface of the pipe. Then, cover the surface of each optical cable and the surface of the epoxy glue with glass fiber tape. Press the glass fiber tape to make the surface of the epoxy glue on both sides of each optical cable beveled.

[0010] When handling the bend: When the optical cable is pasted to the bend of the pipe, use a corrugated tube for transition. The optical cable should jump up at both ends of the corrugated tube without pasting. Use a cylinder with a diameter of 6-8 cm to pad the jump of the optical cable. Remove the cylinder after the rest of the optical cable is pasted.

[0011] During the treatment steps at the anchor point: the optical cable at the anchor point is covered with a stainless steel cable trough; the stainless steel cable trough is in the shape of an Ω with flanges on both sides of the bottom. First, use double-sided tape to temporarily fix the flanges on both sides of the stainless steel cable trough to the surface of the pipe, and then use epoxy colloid to reinforce it; the jump part of the optical cable at the anchor point is treated in the same way as the treatment steps for the bend;

[0012] During the optical cable winding step: a buried area is set up outside the well wall on one side of the valve well, the optical cable is attached to the well wall at one end of the valve well, leaves the pipeline and begins to wind toward the well wall on the side of the valve well with the buried pit, and returns to the pipeline when leaving the well wall at the other end of the valve well after the winding is completed; a certain length is reserved for all the winding optical cables from leaving the pipeline to returning to the pipeline, and the five reserved optical cables on each pipeline are first covered with an open corrugated tube, then wrapped with tape outside the open corrugated tube, and then coiled into an optical cable coil and left in the buried area;

[0013] The following steps are included in the optical cable well penetration process:

[0014] S1. Pre-buried six threading sleeves on the well walls at both ends of the valve well, corresponding to the layout positions of the six pipes in the valve well;

[0015] S2. The five optical cables on each pipeline outside the two ends of the valve well leave the pipeline when they reach the well wall at the end of the valve well, and then pass through the same threading sleeve on the well wall at both ends to enter the valve well. The two sections of optical cable entering the valve well are both reserved with redundant length for optical cable fusion splicing;

[0016] S3. Use the optical cable splice barrel to fuse each optical cable in the valve well. After the splicing is completed, hang the optical cable splice barrel and the optical cable remaining in the valve well on the side wall of the valve well through expansion screws and stainless steel cable ties;

[0017] S4. Fill each wire casing with fireproof plugging material on the inner side of the well wall at both ends to a depth of 50-100mm; fill each wire casing with polyurethane foam on the outer side of the well wall at both ends;

[0018] S5. Use sealant to seal the fireproof plugging material and polyurethane foam on the inner and outer sides of the well walls at both ends respectively.

[0019] The above-mentioned method for laying monitoring optical cables on water supply and drainage pipelines further includes a cable break processing step, including the following three situations:

[0020] (1) The optical cable at one end of the breakpoint has not been pasted on the pipe. When handling, pry up the optical cable at one end of the breakpoint that has been pasted on the pipe by 1-2 meters, and release the remaining amount of the optical cable at the other end that has not been pasted on the pipe through the pay-out rack. Then use an optical cable splice to weld the optical cables at both ends of the breakpoint together. Then, re-paste the lifted section of optical cable on the pipe, and fix the optical cable splice to the pipe with tape.

[0021] (2) The optical cables at both ends of the break are glued to the pipe. When handling, lift up the optical cables at both ends of the break by 1-2 meters, add another section of the same type of optical cable, and use two optical cable joints to connect the added optical cables between the optical cables at both ends of the break. Then, glue the lifted optical cables at both ends to the pipe again, and fix the two optical cable joints to the pipe with tape.

[0022] (3) The optical cables at both ends of the break are not glued to the pipe; when handling, use an optical cable splice to fuse the optical cables at both ends of the break.

[0023] In the above-mentioned method for laying monitoring optical cables on water supply and drainage pipelines, when the optical cable is threaded through the well, the pre-buried height of the threading sleeve is 300 mm higher than the top of the pipeline.

[0024] The characteristics of the method for laying monitoring optical cables on water supply and drainage pipelines of the present invention are:

[0025] 1. The optical cable is laid on the outer surface of the pipe to achieve better performance.

[0026] 2. The treatment method at the bend of the pipeline can ensure the construction quality of the optical cable;

[0027] 3. The stainless steel cable ducts installed at the anchor piers and road crossings can ensure that the optical cables are not directly covered by the encapsulating concrete, thus ensuring the safety of the optical cables.

[0028] 4. Repair the optical cable breakpoints caused by emergencies through the optical cable joint tube, so that the optical cable joints maintain good sealing performance and ensure communication quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of six pipes involved in the method for laying monitoring optical cables on water supply and drainage pipes of the present invention within the pipe base trench;

[0030] Figure 2 It is a plan view of the optical cable orientation involved in the method for laying a monitoring optical cable on an intake and drainage pipeline of the present invention;

[0031] Figure 3 This is a cross-sectional view of a method for laying monitoring optical cables on water intake and drainage pipes according to the present invention, wherein five optical cables are laid on each pipe;

[0032] Figure 4 It is a longitudinal cross-sectional view after the glue sealing and reinforcement step in the laying method of the present invention is completed;

[0033] Figure 5 It is a longitudinal section view after completing the processing steps of the anchorage in the laying method of the present invention;

[0034] Figure 6 This is a structural diagram after completing the cable break processing step in the laying method of the present invention;

[0035] Figure 7 is a plan view of the valve well after the optical cable winding step in the laying method of the present invention is completed;

[0036] Figure 8 is a longitudinal cross-sectional view of the valve well after the optical cable threading step in the laying method of the present invention is completed;

[0037] Figure 9 yes Figure 8 Magnified view of the P site in the middle. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings.

[0039] See also Figures 1 to 9 The method for laying monitoring optical cables on drainage pipes of the present invention is used to lay five optical cables 20 on the outer surface of each pipe 10 buried in the six pipe base trenches 100 and bypass the valve wells 11 and 13 and pass through the valve wells 12 and 14 (see Figure 1 and Figure 2 ); One optical cable 20 is laid at a position 90° to the horizontal center line of each pipeline, two optical cables 20 are located at positions 45° and 135° to the horizontal center line, and two optical cables 20 are located at positions 195° and 345° to the horizontal center line (see Figure 3 ).

[0040] The method for laying monitoring optical cables on nuclear power plant water supply and drainage pipelines of the present invention comprises the following steps: polishing the pipeline surface, applying primer, pasting the optical cables, sealing and reinforcing with glue, processing bends, processing anchor points, processing cable breaks, winding the optical cables around the well, and threading the optical cables through the well;

[0041] During the pipeline surface polishing step, first mark the cable pasting areas on the surface of each pipeline 10 corresponding to the installation positions of the five optical cables 20. The width of each cable pasting area is 6-8 cm. Then, use a handheld electric wire drawing grinding wheel to polish along the marked cable pasting areas close to the surface of the pipeline. Then, use a dust-free wipe paper dipped in anhydrous ethanol to repeatedly wipe the polished cable pasting areas until there are no obvious stains on the dust-free wipe paper. Then, use a tape measure and a marker to mark the center line of the cable pasting area every 1.5-2 meters, that is, the cable pasting line.

[0042] During the primer application step, the glue application worker applies the 3M primer 31 to the optical cable pasting area along the pasting route;

[0043] During the optical cable pasting step, the pasting operator must paste the adhesive film of the optical cable 20 onto the 3M primer 31 within 5 minutes after the glue coating operator has applied the 3M primer 31; during the pasting process, the optical cable must be kept in a pre-tensioned straight state; after the optical cable is pasted, the optical cable 20 must be rolled with a roller with a radius greater than 1 cm, and the rolling must be repeated 3 times to enhance the pressure-sensitive bonding strength between the optical cable adhesive 32 and the 3M primer 31;

[0044] During the glue sealing reinforcement step, first use dust-free wipes dipped in anhydrous ethanol to clean and wipe the surface of the optical cable to remove residual oil and impurities. Then, use a disposable paper cup to evenly mix the AB two-component epoxy resin glue in a 1:1 weight ratio and put it into a disposable plastic bag of a glue gun. Then use a glue gun to evenly apply it between the two sides of the optical cable 20 and the surface of the pipe 10. Then, cover the surface of the optical cable 20 and the surface of the epoxy glue 33 with glass fiber tape. By pressing the glass fiber tape, the surface of the epoxy glue 33 on both sides of each optical cable 20 is inclined (see Figure 4 );

[0045] When handling the bend: When the optical cable is pasted to the bend of the pipeline, a corrugated tube is used for transition. The optical cable should jump up at both ends of the corrugated tube. A cylinder with a diameter of 6-8 cm is used to pad the jump of the optical cable, so that the jump part of the optical cable forms a slack of 10-20 mm. The cylinder is removed after the rest of the optical cable is pasted. When backfilling the pipeline foundation trench, the jump part of the optical cable is pre-filled with the original soil on site to avoid gaps between the jump part and the pipeline.

[0046] When performing the processing steps at the anchor pier: the optical cable 20 at the anchor pier is covered with a stainless steel wire duct 4; the stainless steel wire duct 4 is in the shape of an Ω with flanges on both sides of the bottom. First, use double-sided tape to temporarily fix the flanges on both sides of the stainless steel wire duct 4 to the surface of the pipe 20, and then use epoxy colloid 33 to reinforce it (see Figure 5); stainless steel trough 4 will be encapsulated concrete 200 and the optical cable 20 isolation town pier; the cable in the town pier at the jump portion of the processing steps and the bend of the same method of processing;

[0047] The following three situations are included in the cable break handling steps:

[0048] (1) The optical cable at one end of the breakpoint has not been pasted on the pipe; when handling, pry up the optical cable at one end of the breakpoint that has been pasted on the pipe by 1-2 meters, and release the remaining amount of the optical cable at the other end that has not been pasted on the pipe through the pay-out rack, and then use an optical cable joint barrel to weld the optical cables at both ends of the breakpoint together; then re-paste the raised section of optical cable on the pipe 10, and fix the optical cable joint barrel 5 on the pipe 10 with tape (see Figure 6 ); When backfilling the pipeline foundation trench 100, first use fine sand backfill around the cable splice barrel 5, backfill the fine sand to a height higher than the cable splice barrel 15cm, and then use the original soil backfill;

[0049] (2) The optical cables at both ends of the break are pasted on the pipe; when handling, lift up the optical cables at both ends of the break by 1-2 meters, add a section of the same type of optical cable, and use two optical cable joints to connect the added optical cables between the optical cables at both ends of the break; then re-paste the lifted optical cables at both ends of the break back on the pipe, and fix the two optical cable joints on the pipe with tape; when backfilling the pipe base trench, first use fine sand to backfill around the optical cable joint, and after the fine sand is backfilled to 15cm higher than the optical cable joint, use the original soil to backfill;

[0050] (3) The optical cables at both ends of the break are not glued to the pipe; when handling, use an optical cable splice to fuse the optical cables at both ends of the break.

[0051] During the optical cable winding step: a buried area 15 is set outside the well wall on one side of the valve well 11, and the optical cable 20 is pasted to the well wall less than 10 cm away from one end of the valve well 11, and then leaves the pipe 10 and begins to wind toward the well wall on the side of the valve well 11 with the buried area 15. After the winding is completed, it returns to the pipe 10 when it leaves the well wall on the other end of the valve well 11 by 10 cm; all the winding optical cables 20 are reserved for a certain length from leaving the pipe 10 to returning to the pipe 10, and the five reserved optical cables on each pipe 10 are first covered with an open corrugated tube, and then wrapped with tape outside the open corrugated tube, and then coiled into an optical cable drum 20A, and the optical cable drum 20A is left in the buried area 15 (see Figure 7 ); When backfilling the pipeline foundation trench, first backfill the buried area with fine sand to at least 15 cm above the top of the cable reel 20A, and then backfill with original soil.

[0052] The following steps are included in the optical cable well penetration process:

[0053] S1. Pre-buried six threading sleeves 6 on the well walls 120 at both ends of the valve well 12, corresponding to the arrangement positions of the six pipes 10 in the valve well 12; the pre-buried height of the threading sleeves 6 is 300 mm higher than the top of the pipes 10;

[0054] S2. The five optical cables on each pipe 10 outside the two ends of the valve well 12 leave the pipe 10 when they are less than 10 cm from the well wall at one end of the valve well 12. Then, corrugated tubes are placed over the five optical cables leaving the pipe 10. The cables then pass through the same threading sleeve 6 on the well wall 120 at both ends and enter the valve well 12. Redundant lengths of optical cables 20 on both sides of the valve well 12 are reserved for cable fusion splicing and are covered with corrugated tubes.

[0055] S3, use the optical cable splice 5 to weld the optical cables 20 on both sides (see Figure 8 ), after the fusion is completed, the optical cable splice barrel 5 and the optical cable 20 remaining in the valve well 12 are hung on the side well wall of the valve well 12 by expansion screws and stainless steel cable ties;

[0056] S4. Fill each wire sleeve 6 with fireproof plugging material 61 on the inner side of the well wall 120 at both ends to a filling depth of 50-100 mm; fill each wire sleeve 6 with polyurethane foam 62 on the outer side of the well wall 120 at both ends;

[0057] S5, the inner and outer sides of the well walls 120 at both ends are sealed with sealant 63 to seal the fireproof blocking material 61 and polyurethane foam 62 (see Figure 9 ).

[0058] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A method for laying monitoring optical cables on drainage pipelines, comprising laying five optical cables on the outer surfaces of each of six pipelines buried in a pipeline trench, bypassing and passing through valve wells; one optical cable is laid at a 90° angle to the horizontal centerline of each pipeline, two optical cables are correspondingly located at 45° and 135° angles to the horizontal centerline, and two optical cables are correspondingly located at 195° and 345° angles to the horizontal centerline; characterized in that: The laying method comprises the following steps: polishing the pipeline surface, applying primer, pasting the optical cable, sealing and reinforcing, processing the bends, processing the anchor points, winding the optical cable around the well and threading the optical cable through the well; When performing the pipeline surface polishing step, first mark the cable pasting area on the surface of each pipeline corresponding to the installation position of the five optical cables; then use a polishing wheel to polish along the marked cable pasting area; then use a dust-free wipe dipped in anhydrous ethanol to wipe the polished cable pasting area clean; then mark the center line of the cable pasting area, that is, the cable pasting line; During the primer application step, the glue applicator applies 3M primer to the cable pasting area along the cable pasting route; During the step of pasting the optical cable, the pasting operator must paste the optical cable adhesive film onto the 3M primer within 5 minutes after the glue coating operator has applied the 3M primer. After the optical cable is pasted, use a roller to roll the optical cable. During the glue sealing reinforcement step, first wipe the surface of the optical cable clean with a dust-free wipe dipped in anhydrous ethanol. Then, evenly apply epoxy resin glue between the two sides of each optical cable and the surface of the pipe. Then, cover the surface of each optical cable and the surface of the epoxy glue with glass fiber tape. Press the glass fiber tape to make the surface of the epoxy glue on both sides of each optical cable beveled. When handling the bend: When the optical cable is pasted to the bend of the pipe, use a corrugated tube for transition. The optical cable should jump up at both ends of the corrugated tube without pasting. Use a cylinder with a diameter of 6-8 cm to pad the jump of the optical cable. Remove the cylinder after the rest of the optical cable is pasted. During the treatment steps at the anchor point: the optical cable at the anchor point is covered with a stainless steel cable trough; the stainless steel cable trough is in the shape of an Ω with flanges on both sides of the bottom. First, use double-sided tape to temporarily fix the flanges on both sides of the stainless steel cable trough to the surface of the pipe, and then use epoxy colloid to reinforce it; the jump part of the optical cable at the anchor point is treated in the same way as the treatment steps for the bend; During the optical cable winding step: a buried area is set up outside the well wall on one side of the valve well, the optical cable is attached to the well wall at one end of the valve well, leaves the pipeline and begins to wind toward the well wall on the side of the valve well with the buried pit, and returns to the pipeline when leaving the well wall at the other end of the valve well after the winding is completed; a certain length is reserved for all the winding optical cables from leaving the pipeline to returning to the pipeline, and the five reserved optical cables on each pipeline are first covered with an open corrugated tube, then wrapped with tape outside the open corrugated tube, and then coiled into an optical cable coil and left in the buried area; The following steps are included in the optical cable well penetration process: S1. Pre-buried six threading sleeves on the well walls at both ends of the valve well, corresponding to the layout positions of the six pipes in the valve well; S2. The five optical cables on each pipeline outside the two ends of the valve well leave the pipeline when they reach the well wall at the end of the valve well, and then pass through the same threading sleeve on the well wall at both ends to enter the valve well. The two sections of optical cable entering the valve well are both reserved with redundant length for optical cable fusion splicing; S3. Use the optical cable splice barrel to fuse each optical cable in the valve well. After the splicing is completed, hang the optical cable splice barrel and the optical cable remaining in the valve well on the side wall of the valve well through expansion screws and stainless steel cable ties; S4. Fill each wire casing with fireproof plugging material on the inner side of the well wall at both ends to a depth of 50-100mm; fill each wire casing with polyurethane foam on the outer side of the well wall at both ends; S5. Use sealant to seal the fireproof plugging material and polyurethane foam on the inner and outer sides of the well walls at both ends respectively.

2. The method for laying monitoring optical cables on water supply and drainage pipelines according to claim 1, characterized in that: The laying method also includes a cable break handling step, including the following three situations: (1) The optical cable at one end of the breakpoint has not been pasted on the pipe. When handling, pry up the optical cable at one end of the breakpoint that has been pasted on the pipe by 1-2 meters, and release the remaining amount of the optical cable at the other end that has not been pasted on the pipe through the pay-out rack. Then use an optical cable splice to weld the optical cables at both ends of the breakpoint together. Then, re-paste the lifted section of optical cable on the pipe, and fix the optical cable splice to the pipe with tape. (2) The optical cables at both ends of the break are glued to the pipe. When handling, lift up the optical cables at both ends of the break by 1-2 meters, add another section of the same type of optical cable, and use two optical cable joints to connect the added optical cables between the optical cables at both ends of the break. Then, glue the lifted optical cables at both ends to the pipe again, and fix the two optical cable joints to the pipe with tape. (3) The optical cables at both ends of the break are not glued to the pipe; when handling, use an optical cable splice to fuse the optical cables at both ends of the break.

3. The method for laying monitoring optical cables on water supply and drainage pipes according to claim 1, characterized in that: When performing the optical cable well-threading step, the pre-buried height of the threading sleeve is 300 mm higher than the top of the pipeline.

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