CN111946923A - Pipeline opening sealing device and construction method for migrating and modifying gas main pipeline - Google Patents
Pipeline opening sealing device and construction method for migrating and modifying gas main pipeline Download PDFInfo
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- CN111946923A CN111946923A CN202010632337.XA CN202010632337A CN111946923A CN 111946923 A CN111946923 A CN 111946923A CN 202010632337 A CN202010632337 A CN 202010632337A CN 111946923 A CN111946923 A CN 111946923A
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- pipeline
- plugging
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- opening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L41/00—Branching pipes; Joining pipes to walls
- F16L41/04—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor
- F16L41/06—Tapping pipe walls, i.e. making connections through the walls of pipes while they are carrying fluids; Fittings therefor making use of attaching means embracing the pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention relates to a pipeline tapping sealing device and a construction method for moving and modifying a main gas pipeline.A four-way pipe fitting is connected with a position of a plugging hole, the four-way pipe fitting is of a structure with two horizontal ends open, two vertical ends open and one end closed, the four-way pipe fitting is reliably welded with a pre-modified pipeline, parts such as a safety gate valve, a tapping connecting box, a plugging knife assembly and the like on the four-way pipe fitting complete tapping and plugging operation on the pipeline, non-stop operation is realized by utilizing a bypass pipe, the problem of moving and modifying the gas pipeline with different pressure levels without stopping gas is properly solved, and the problem of gas leakage existing in tapping under pressure is effectively avoided by adopting special shaft seal filler.
Description
Technical Field
The invention belongs to the technical field of municipal construction, and particularly relates to a pipeline tapping sealing device and a construction method for a main pipeline of mobile modified fuel gas.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The urban subway construction is influenced by a plurality of external factors, particularly the construction of the subway station excavation (covering) is influenced by various relations, the urban subway construction comprises an electric power pipeline, a rain and sewage pipeline, gas pipelines with different pressure grades, various communication pipelines and the like, and medium and high pressure gas pipelines are buried under municipal roads by steel pipes. The method for moving and modifying various pipelines is adopted according to the needs of subway construction, the moving and modifying of the pipelines are influenced by a plurality of factors, particularly the moving and modifying of medium-high pressure gas pipelines, the construction risk is avoided, the adverse influence of the gas stopping moving and modifying on the lives of industrial and mining enterprises and residents is considered, a plurality of limiting factors of the moving and modifying of the pipelines are formed, the normal construction period progress of the subway engineering construction is influenced to a certain extent, and the economic benefits of construction enterprises are influenced to different extents.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a pipe opening sealing device and a construction method for migrating and reforming a main gas pipeline.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the first aspect is that a pipeline trompil sealing device, for combination formula four-way pipe fitting, four-way pipe fitting comprises first cross and the four-way lower half, forms two crossing hollow tube structures perpendicularly after first cross and four-way lower half are involuted, two vertically hollow tubes are horizontal hollow tube and vertical hollow tube respectively, the involution line of first cross and four-way lower half is located the central horizontal symmetry plane of horizontal hollow tube, horizontal hollow tube both ends are open structure, vertical hollow tube is for one end to seal, one end is open-ended structure.
The invention utilizes the combined type four-way pipe fitting to tightly cover the outer side of the original pipeline and to be welded with the original pipeline into a reliable and sealed whole, thereby creating a closed space for tapping operation on the pipeline without stopping the air flow. The one end of the vertical hollow tube of the four-way pipe fitting is of a closed structure, the other end of the vertical hollow tube of the four-way pipe fitting is of an open structure, the open end provides a safe operation channel for tapping and plugging the original pipeline, and the open structure is provided with a reliable closed structure and plays a role in isolating the tapped space from the outside air.
In a second aspect, the method for using the sealing device for opening a pipe comprises the following steps: the upper half part and the lower half part of the cross joint tightly coat the original pipeline, and the butt joint and the circular seam formed by the upper half part and the lower half part and the original pipeline are welded, so that the cross joint part and the original pipeline form an integral structure.
In a third aspect, the method for opening the pipeline by using the pipeline opening sealing device specifically comprises the following steps:
1. the opening position on the pipeline is connected with a gate valve, the corresponding tapping machine, the plugging connecting box and the plugging knife assembly are installed on a sandwich valve together, and the airtight inspection is carried out on the containing cavity where the opening knife is located through a stop valve on the plugging connecting box;
2. connecting the tapping machine with a power supply of a power station;
3. starting the tapping machine to test, starting the tapping machine, and automatically feeding the tapping cutter downwards to start tapping operation;
4. stopping when the cutting is confirmed to be finished, and lifting the tapping cutter and the material block back to the tapping connecting box;
5. closing the sandwich valve;
6. discharging the medium in the header.
The pipeline tapping method provided by the invention ensures that leakage does not occur during tapping under pressure, and ensures that tapping equipment cuts and taps a gas pipeline in a completely closed cavity.
In a fourth aspect, a method for plugging an opening of a pipeline by using the pipeline opening sealing device comprises the following specific steps:
after the pipeline trompil, the splint valve is connected in the drill way of trompil, then carries out the shutoff of trompil, and the process of shutoff is:
1) determining the opening direction of the plugging cylinder according to the field process requirement
2) The plugging device is connected with the plugging cylinder by screw thread
3) Accurately hoisting the plugging device to the clamp plate valve by using a crane, and paying attention to no collision in the hoisting process;
4) the hydraulic rubber tube and the plugging device are connected, the hydraulic station is started, the plugging cylinder slowly moves downwards, and after the plugging cylinder enters a pipeline plugging position, the pipeline is plugged.
In a fifth aspect, the construction method for changing the main gas pipeline by using the pipeline opening sealing device comprises the following specific steps:
selecting the positions of two plugging holes and two bypass holes on an original pipeline, wherein the plugging holes and the bypass holes are positioned at two sides of the pipeline to be replaced, welding special four-way pipe fittings for plugging at the positions of plugging points, and welding short sections at the positions of the bypass holes;
the method is used for opening the two blocking holes and opening the two bypass holes and the diffusing hole, then the method is used for blocking the blocking holes, the sandwich valve for connecting the bypass pipe and the bypass holes is used for blocking, and the gate valve connected with the bypass pipe is opened;
after plugging, releasing the medium through a bleeding valve connected with a bleeding hole, and mechanically cutting and breaking the pipe after the tightness is detected to be qualified;
butt-jointing a new pipeline and detecting a welding seam;
the construction method for changing the main gas pipeline without stopping gas migration is suitable for the condition of underground gas pipeline construction, the position of a certain section of pipeline needs to be moved and changed, the conventional construction method needs to cut off the existing pipeline, so that the supply of gas can be interrupted, and the construction method can change the gas pipeline on the premise of ensuring the supply of gas.
The invention has the beneficial effects that:
the special disk-shaped plugging head is adopted to plug the pipeline, so that the problem of gas leakage caused by hole opening under pressure is effectively solved, and the hole opening equipment is ensured to cut, open and plug the gas pipeline in a completely closed cavity.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a flow chart of a method of bump-on-no-stop gas diversion into a main gas pipeline of the present invention;
FIG. 2 is a structural view of a coupling four-way pipe fitting and a nipple according to embodiment 1 of the present invention;
FIG. 3 is a structural view of a four-way pipe according to embodiment 1 of the present invention;
FIG. 4 is a structural diagram of a pipe nipple and a four-way pipe fitting connecting valve of embodiment 1 of the present invention, wherein the vent hole is opened;
FIG. 5 is a view showing the construction of the temporary bypass pipe installation in accordance with embodiment 1 of the present invention;
fig. 6 is a structural view of completion of plugging in embodiment 1 of the present invention;
FIG. 7 is a diagram showing the construction of the butt joint between the old and new pipelines according to embodiment 1 of the present invention;
FIG. 8 is a schematic illustration of example 1 of the present invention after removal;
FIG. 9 is a schematic view of a pipe lap weld of example 1 of the present invention;
FIG. 10 is a schematic view of a butt weld of a pipe according to example 1 of the present invention;
the device comprises a pipe 1, a short joint, a four-way pipe 2, a four-way pipe 3, a pipeline needing to be replaced, 4, an original pipeline, 5, the upper half part of the four-way pipe, 6, the lower half part of the four-way pipe, 7, a horizontal butt joint line, 8, a bypass gate valve, 9, a plugging gate valve, 10, a blow-off hole, 11, a bypass pipe, 12, a plugging machine, 13, a plugging connecting box, 14, a plugging main shaft rod, 15, a plugging cylinder, 16, a blind plate, 17, an old pipe, 18, a new pipe, 19 and plugging.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The first aspect is that a pipeline trompil sealing device, for combination formula four-way pipe fitting, four-way pipe fitting comprises first cross and the four-way lower half, forms two crossing hollow tube structures perpendicularly after first cross and four-way lower half are involuted, two vertically hollow tubes are horizontal hollow tube and vertical hollow tube respectively, the involution line of first cross and four-way lower half is located the central horizontal symmetry plane of horizontal hollow tube, horizontal hollow tube both ends are open structure, vertical hollow tube is for one end to seal, one end is open-ended structure. The open end provides a safe operation channel for tapping and plugging the original pipeline, and the open structure has a reliable closed structure and plays a role in isolating the tapping space from the outside air.
In a second aspect, the method for using the sealing device for opening a pipe comprises the following steps: the upper half part and the lower half part of the cross joint tightly coat the original pipeline, and the butt joint and the circular seam formed by the upper half part and the lower half part and the original pipeline are welded, so that the cross joint part and the original pipeline form an integral structure. Creating a closed space for opening a hole on a pipeline without stopping air.
In a third aspect, the method for opening the pipeline by using the pipeline opening sealing device specifically comprises the following steps:
1. the opening position on the pipeline is connected with a gate valve, the corresponding tapping machine, the plugging connecting box and the plugging knife assembly are installed on a sandwich valve together, and the airtight inspection is carried out on the containing cavity where the opening knife is located through a stop valve on the plugging connecting box;
2. connecting the tapping machine with a power supply of a power station;
3. starting the tapping machine to test, starting the tapping machine, and automatically feeding the tapping cutter downwards to start tapping operation;
4. stopping when the cutting is confirmed to be finished, and lifting the tapping cutter and the material block back to the tapping connecting box;
5. closing the sandwich valve;
6. discharging the medium in the header.
In some embodiments of the present invention, the step of tapping by the tapping machine is: and opening a gate valve, after a drill bit of the tapping machine is contacted with the pipe wall, drilling by the tapping machine, starting cutting, after cutting, closing the tapping machine, lifting the tapping machine and the plugging material block back into the tapping connecting box, closing the gate valve, opening a pressure release valve of the tapping connecting box, discharging a medium in the tapping connecting box, and disassembling the tapping machine.
In some embodiments of the present invention, the tapping machine comprises the following specific steps:
starting the tapping machine to run for 3 minutes, and checking whether each part runs normally; stopping the drilling machine after the equipment operates stably, manually shaking a crank of the tapping machine, recording the scales of the drill rod and reversely rotating the crank for 1 circle when the tip of the drill bit contacts the pipe wall; the tapping machine is started, and the tapping cutter automatically feeds downwards to start tapping operation; when the cutting is confirmed to be finished, the vehicle is stopped, the crank is manually rotated, and the tapping knife and the material block are lifted back to the tapping connecting box; closing the sandwich valve, opening a pressure relief valve on the connecting box, discharging the medium in the connecting box, and disassembling the tapping machine according to the program; and (5) detaching the tapping knife and the material block from the drilling rod of the tapping machine, and unsealing the plugged hole.
In some embodiments of the present invention, the process of the above-mentioned airtightness test is as follows: and (3) carrying out pressure test by using nitrogen, replacing air in the open pore sealed containing cavity, injecting the nitrogen by using a relief valve of the plugging connecting box, relieving the nitrogen in the sealed containing cavity through the relief valve of the open pore connecting box after the nitrogen is filled, repeating the nitrogen filling and relieving processes twice, and completing air replacement in the sealed containing cavity after the nitrogen is filled for the third time.
Preferably, the pressure of the nitrogen injected for the first time and the second time is 0.5-0.7MPa, the pressure of the nitrogen in the sealed cavity after the first diffusion is 0.08-0.12MPa, and the pressure of the nitrogen filled for the third time is 0.5-0.7 MPa.
In a fourth aspect, a method for plugging an opening of a pipeline by using the pipeline opening sealing device comprises the following specific steps:
after the pipeline trompil, the splint valve is connected in the drill way of trompil, then carries out the shutoff of trompil, and the process of shutoff is:
1) determining the opening direction of the plugging cylinder according to the field process requirement
2) The plugging device is connected with the plugging cylinder by screw thread
3) Accurately hoisting the plugging device to the clamp plate valve by using a crane, and paying attention to no collision in the hoisting process;
4) the hydraulic rubber tube and the plugging device are connected, the hydraulic station is started, the plugging cylinder slowly moves downwards, and after the plugging cylinder enters a pipeline plugging position, the pipeline is plugged.
In some embodiments of the present invention, the plugging process in step 4) is specifically: preferably, the blocking process specifically comprises: the plugging machine is connected with the hydraulic rubber pipe and the hydraulic pump station, the hydraulic pump station is started, and the plugging plate slowly moves downwards to enter the pipeline to complete pipeline plugging.
In a fifth aspect, the construction method for changing the main gas pipeline by using the pipeline opening sealing device comprises the following specific steps:
selecting the positions of two plugging holes and two bypass holes on an original pipeline, wherein the plugging holes and the bypass holes are positioned at two sides of the pipeline to be replaced, welding special four-way pipe fittings for plugging at the positions of plugging points, and welding short sections at the positions of the bypass holes;
the method is used for opening the two blocking holes and opening the two bypass holes and the diffusing hole, then the method is used for blocking the blocking holes, the sandwich valve for connecting the bypass pipe and the bypass holes is used for blocking, and the gate valve connected with the bypass pipe is opened;
after plugging, releasing the medium through a bleeding valve connected with a bleeding hole, and mechanically cutting and breaking the pipe after the tightness is detected to be qualified;
and (6) butting a new pipeline, and detecting a welding seam.
In the construction method, temporary bypass holes, plugging holes and diffusing holes are arranged at two sides of the pipeline to be replaced, the temporary bypass holes, the plugging holes and the diffusing holes are opened, the pre-migration pipeline is plugged and diffused by the plugging holes, and the temporary bypass holes are connected with two ends of the pipeline to be replaced, so that the series of defects that the pipeline needs to be stopped in the conventional pipeline construction process are overcome.
The medium in the discharge pipeline is the operation after the plugging hole is plugged, and the main purpose is to remove the medium in the pipeline before the pipeline needing to be replaced is cut.
The function of the dispersion holes is to release the fuel gas in the original pipeline between the two blocking holes so as to avoid the danger caused by leakage in the construction process.
In some embodiments of the invention, the dispersion hole is opened through DN32 or DN 40.
In some embodiments of the present invention, the construction method includes a finishing post-processing step, wherein the post-processing step includes plugging and blind plate installation, and the specific steps include:
1. welding the perforated material block on the plug of the pipe fitting;
2. installing the plug and the blanking on a lower plug device;
3. installing a lower plugging device on a sandwich valve;
4. opening the sandwich valve;
5. performing lower blocking operation;
6. after the completion of the process is confirmed, opening a relief valve on the lower blocking connecting box to confirm whether the process is qualified or not;
7. detaching the lower plug;
8. and (6) mounting a blind plate.
In some embodiments of the invention, the outer surface of the pipe is cleaned and polished by an angle grinder before welding, and the 50mm edge is cleaned of dirty oil and oxide layers and slag.
In some embodiments of the invention, when the four-way joint is welded with the original gas pipeline, the gap between the four-way joint and the original gas pipeline is not more than 2mm, and the difference between the distances from two ends of the four-way joint flange along the axial direction of the pipeline to the top of the pipeline is not more than 1 mm; the offset distance between the central axis of the four-way flange hole and the central axis of the pipeline at the position of the central axis is not more than 1.5 mm.
In some embodiments of the present invention, when butt welding new and old pipelines, the gap of the butt position should not be larger than 2mm, the opening angle of the butt weld of the pipelines is 60 degrees, and the butt joint of the pipelines should be smooth without obvious salient points.
In some embodiments of the invention, the location of the opening is preferably a straight section of the pipe.
In some embodiments of the invention, the welding method uses arc welding with current controlled at 100A-130A, and the electrode uses arc welding
And
welding rod, implementing the welding standard GB 50236-2011. The construction time is selected in clear and windless weather, and a wind-proof and rain shed is adopted when necessary to keep the welding environment dry and windless; fillet welding is adopted as shown in figure 9, and butt welding is adopted as shown in figure 10.
According to the invention, the tapping machine, the plugging connecting box and the plugging material block are matched to tap, so that the problem of gas leakage in tapping under pressure is effectively avoided, and the tapping equipment is ensured to cut, tap and plug the gas pipeline in a completely closed cavity.
The invention will be further illustrated by the following examples
Example 1
The structure of the four-way pipe fitting 2 is shown in fig. 3, the four-way pipe fitting is composed of an upper four-way half part 5 and a lower four-way half part 6, the upper four-way half part 5 and the lower four-way half part 6 are folded to form two vertically crossed hollow pipe structures, the folding line is a horizontal folding line 7, the lower four-way half part 6 is located below the upper four-way half part 5 after folding, and the bottom opening of the lower four-way half part 6 is closed.
In the using process, the pre-perforated pipeline is tightly wrapped by the upper cross part 5 and the lower cross part 6, and the butt joint of the upper cross part 5 and the lower cross part 6 and the circular seam formed by the upper cross part 5, the lower cross part 6 and the original pipeline are welded, so that the four-way component and the original pipeline form an integral structure. According to the invention, the pipeline is fixed by using the four-way pipe fitting, and then the hole is opened, so that the hole is closed, and the sealing is good.
Example 2
Comprises a method for opening a pipeline and blocking the opening of the pipeline by using a four-way pipe fitting.
A station of rail transit in a certain city is positioned at the intersection of the north road of the Qingshan mountain and the middle and large roads and laid along the direction of the north road of the Qingshan mountain. The main gas pipeline of the longitudinal crossing station DN508 multiplied by 8 needs to be moved and modified in the construction of the main engineering of the station, the pipeline is found to be a main gas transmission and distribution pipeline of a certain city through investigation in the early stage, and is mainly supplied to residents and partial industrial gas of two administrative areas in the range of the old city. In order to ensure the safety of the main gas pipeline in moving and changing and avoid the adverse effect of the gas-stopping moving and changing pipeline on the normal production of urban residents and industrial and mining enterprises, the non-gas-stopping open hole touch connection technology of the gas pipeline is provided.
As shown in fig. 1, the specific process is as follows:
1) selecting a perforated plugging position
According to the migration and modification requirements of the gas pipeline, the exposed migration and modification pipeline is excavated at the pre-migration and modification pipeline according to the requirements of the construction scheme, and the excavation range meets the requirements of the space required by pipeline migration and modification. During the excavation process, a leak detector is used for detecting the leakage condition of the gas pipeline, and the pipeline can be exposed after the safety is confirmed; and detecting data such as the wall thickness, the operating pressure, the medium flow direction, the flow velocity and the like of the pipeline by using an instrument. Should confirm the trompil position at 4 straightways of former pipeline, demolish the anticorrosive coating of pipeline trompil department in advance according to technical requirement, clear up former pipeline 4 to exposing the metal primary color, pipeline welding seam should be dodged to the trompil department, when being difficult to dodge, grinds the trompil department welding seam. Selecting the positions of two plugging holes and two bypass holes on an original pipeline 4, wherein the plugging holes and the bypass holes are positioned at two sides of a pipeline 3 to be replaced, a special four-way pipe fitting 2 for plugging is welded at the position of a plugging point, and a short section 1 is welded at the position of the bypass hole; the four-way pipe fitting 2 and the short section 1 are respectively connected with a plugging gate valve 9 and a bypass gate valve 8 as shown in figure 2.
2) Unsealing and plugging hole
Installing corresponding tapping machine, tapping connecting box and plugging knife component on a plugging gate valve 9, carrying out airtight inspection on a cavity formed by a stop valve and a tapping knife on the tapping connecting box, carrying out pressure test by using nitrogen gas, replacing air in the tapping sealed cavity, injecting 0.6MPa of nitrogen gas by using a bleeding valve of the tapping connecting box, bleeding the nitrogen gas in the sealed cavity to 0.1MPa through the bleeding valve of the tapping connecting box after the nitrogen gas is filled, repeating the nitrogen gas charging and bleeding processes for two times, and finishing the air replacement in the sealed cavity after the nitrogen gas of 0.6MPa is charged for the third time.
Start tapping machine test run for 3 minutes, whether each position of inspection operates normally, it shuts down after equipment operates steadily, open shutoff slide valve 9, establish to the automatic mode of drilling of tapping machine after manual operation tapping machine handle contacts the pipe wall to the drill bit, it shuts down when confirming the cutting and accomplishing, manual promotion trompil, in even incasement of trompil with the trompil sword is carried back to the trompil together with the shutoff material piece, close shutoff slide valve, open the pressure relief valve on the even case of trompil, discharge even incasement medium, dismantle the tapping machine according to the procedure, tear down the tapping sword from the tapping machine drilling rod, the material piece, unseal the stop-hole.
3) Opening temporary by-pass hole and diffusing hole
A bypass gate valve 8 is installed at the bypass hole, a diffusion gate valve is installed at the diffusion hole 10, and a tapping machine is installed at the positions of the bypass gate valve and the diffusion gate valve for carrying out an air tightness test; opening a bypass gate valve 8 and a diffusion gate valve, drilling a temporary bypass hole and a diffusion hole with the diameter of 32mm on the original pipeline, withdrawing the cutter into the tapping machine connecting box, closing the bypass gate valve 8 and the diffusion gate valve, diffusing a medium in the tapping machine connecting box, disassembling the tapping machine, and completing tapping of the temporary bypass hole and the diffusion hole to obtain the structure shown in FIG. 4;
the two ends of the by-pass pipe 11 are connected with two by-pass gate valves 8, respectively, as shown in fig. 5.
4) Pipeline plugging and butt joint
As shown in fig. 6 and 7, the plugging connecting box 13 is connected with a plugging gate valve, the opening direction of the plugging cylinder is determined according to the site environment condition and the construction process requirement, the plugging machine 12 is connected with the plugging cylinder 15 through threads, the plugging machine 12 is accurately hoisted to the plugging gate valve by using a crane or a chain block, and the main shaft rod 14 of the plugging machine extends into the plugging connecting box 13, so that the plugging machine does not collide with the plugging gate valve in the hoisting process. The hydraulic station is started, the plugging cylinder 15 slowly moves downwards, after the hydraulic station enters a pipeline plugging position, plugging of a pipeline is achieved through a hydraulic control system, the bleeding valve is slowly opened, media in the waste pipeline are discharged, the bleeding valve is closed after the media are discharged, whether plugging is tight or not is detected through soapy water, after the plugging is qualified, the two ends of the pipeline 3 to be replaced are cut off through a cutting machine, the bleeding valves at the two ends are reserved, a new pipe 18 is welded, welding line detection is conducted after welding is completed, and related accessories such as the plugging machine 12 are removed according to a construction technical scheme after the new pipeline does not have a leakage phenomenon.
Fig. 6 is a schematic diagram before the pre-cut pipeline (the pipeline 3 to be replaced) is cut off, and fig. 7 is a schematic diagram after the pre-cut pipeline is cut off and a new pipe is connected, namely a schematic diagram of the completion of pipeline migration.
Before pipeline welding, an angle grinder is used for cleaning and polishing the outer surface of the pipeline, the edge of the pipeline is 50mm, dirty oil and an oxidation layer are removed, and slag is cleaned.
Adopting manual arc welding, controlling current at 100-130A, and adopting welding rod
And
a welding rod, which executes a welding standard GB 50236-2011; the construction time is selected in clear and windless weather, and a wind-proof shed and a rain shed are adopted to keep welding dry and windless when necessary; fillet welding is adopted as shown in figure 9, and butt welding is adopted as shown in figure 10.
The four-way pipe fitting and the gas pipeline are welded by adopting fillet weld, the new pipe 18 and the old pipe 17 are butt weld, the weld is smooth and has no slag inclusion, and the requirement of GB50236-2011 is met.
5) Closing each opening
As shown in fig. 8, according to the technical scheme, the plug 19 and the blanking are arranged on the lower plug; installing a lower plugging device on a sandwich valve; opening the sandwich valve; performing plugging operation according to the operation rules; and after the completion of the process is confirmed, opening a relief valve on the lower blocking connecting box to confirm whether the process is qualified or not.
Detaching the lower plug; mounting a blind plate 16; cleaning the site; anticorrosion and backfilling; filling-in pressure open hole plugging construction recording table
And 4) carrying out flaw detection by a professional inspector in the welding seam inspection process after the new pipe is welded in the step 4), requiring to issue a welding seam detection report, and repairing unqualified pipes according to requirements.
During pipeline installation, the hanger frame should satisfy construction safety requirement, and the hanger frame base must be installed firmly. The welding of the support and hanger frame meets the standard requirements, the gas leakage detection must be carefully carried out before the construction, and the construction environment meets the requirements of the relevant technical standards.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a pipeline trompil sealing device, is the cross pipe fitting, its characterized in that: the four-way pipe fitting is composed of an upper four-way part and a lower four-way part, the upper four-way part and the lower four-way part are oppositely combined to form two vertically crossed hollow pipe structures, the two vertical hollow pipes are respectively a horizontal hollow pipe and a vertical hollow pipe, the opposite joint line of the upper four-way part and the lower four-way part is positioned on the central horizontal symmetrical plane of the horizontal hollow pipe, two ends of the horizontal hollow pipe are of open structures, the vertical hollow pipe is closed at one end, and the other end of the vertical hollow pipe is of an open structure.
2. The method of using the sealing device for pipe openings of claim 1, wherein: the upper half part and the lower half part of the cross joint tightly coat the original pipeline, and the butt joint and the circular seam formed by the upper half part and the lower half part and the original pipeline are welded, so that the cross joint part and the original pipeline form an integral structure.
3. A method of tapping a pipe using the pipe tapping seal as recited in claim 1, wherein: the method comprises the following specific steps:
1) the position of the opening on the pipeline is connected with a gate valve, the corresponding tapping machine, the plugging connecting box and the plugging knife assembly are installed on a sandwich valve together, and the airtight inspection is carried out on the containing cavity where the opening knife is located through a stop valve on the plugging connecting box;
2) connecting the tapping machine with a power supply of a power station;
3) starting the tapping machine to test, starting the machine, and automatically feeding the tapping cutter downwards to start tapping operation;
4) stopping when the cutting is confirmed to be finished, rotating the crank, and lifting the tapping cutter and the material block back to the tapping connecting box;
5) closing the sandwich valve;
6) and discharging the medium in the header.
4. The method of sealing a pipe opening according to claim 3, wherein: the tapping machine comprises the following steps of: and opening a gate valve, after a drill bit of the tapping machine is contacted with the pipe wall, drilling by the tapping machine, starting cutting, after cutting, closing the tapping machine, lifting the tapping machine and the plugging material block back into the tapping connecting box, closing the gate valve, opening a pressure release valve of the tapping connecting box, discharging a medium in the tapping connecting box, and disassembling the tapping machine.
5. The method of sealing a pipe opening according to claim 3, wherein: the process of the air tightness test is as follows: carrying out pressure test by using nitrogen, replacing air in the open pore sealed containing cavity, injecting the nitrogen by using a bleeding valve of the open pore connecting box, bleeding the nitrogen in the sealed containing cavity by using the bleeding valve of the open pore connecting box after the nitrogen is filled, repeating the nitrogen charging and bleeding processes for two times, and completing the replacement of the air in the sealed containing cavity after the nitrogen is charged for the third time;
preferably, the pressure of the nitrogen injected for the first time is 0.5-0.7MPa, the pressure of the nitrogen in the sealed cavity after the first diffusion is 0.08-0.12MPa, and the pressure of the nitrogen filled for the third time is 0.5-0.7 MPa.
6. The method for plugging the pipeline opening by using the pipeline opening sealing device as claimed in claim 1, wherein: after the pipeline trompil, the splint valve is connected in the drill way of trompil, then carries out the shutoff of trompil, and the process of shutoff is:
1. determining the opening direction of the plugging cylinder according to the field process requirement
2. The plugging device is connected with the plugging cylinder by screw thread
3. Accurately hoisting the plugging device to the clamp plate valve by using a crane, and paying attention to no collision in the hoisting process;
4. and connecting the hydraulic rubber tube with the plugging device, starting the hydraulic station, enabling the plugging cylinder to slowly move downwards, and plugging the pipeline after the plugging cylinder enters a pipeline plugging position.
7. The method for sealing an opening of a pipeline according to claim 6, wherein: the plugging process specifically comprises the following steps: the plugging machine is connected with the hydraulic rubber pipe and the hydraulic pump station, the hydraulic pump station is started, and the plugging plate slowly moves downwards to enter the pipeline to complete pipeline plugging.
8. A construction method for migrating and transforming a main gas pipeline is characterized by comprising the following steps: the method comprises the following specific steps:
selecting the positions of two plugging holes and two bypass holes on an original pipeline, wherein the plugging holes and the bypass holes are positioned at two sides of the pipeline to be replaced, welding special four-way pipe fittings for plugging at the positions of plugging points, and welding short sections at the positions of the bypass holes;
the method is used for opening the two blocking holes and opening the two bypass holes and the diffusing hole, then the method is used for blocking the blocking holes, the sandwich valve for connecting the bypass pipe and the bypass holes is used for blocking, and the gate valve connected with the bypass pipe is opened;
after plugging, releasing the medium through a bleeding valve connected with a bleeding hole, and mechanically cutting and breaking the pipe after the tightness is detected to be qualified;
and (6) butting a new pipeline, and detecting a welding seam.
9. The construction method of the main migrated and reformed gas pipeline according to claim 8, wherein: the channels of the dispersion holes are DN32 or DN 40.
10. The construction method of the main migrated and reformed gas pipeline according to claim 8, wherein: the construction method comprises the steps of finishing post-processing, wherein the post-processing steps comprise plugging and blind plate installation, and the specific steps are as follows:
1. welding the perforated material block on the plug of the pipe fitting;
2. installing the plug and the blanking on a lower plug device;
3. installing a lower plugging device on a sandwich valve;
4. opening the sandwich valve;
5. performing lower blocking operation;
6. after the completion of the process is confirmed, opening a relief valve on the lower blocking connecting box to confirm whether the process is qualified or not;
7. detaching the lower plug;
8. mounting a blind plate;
preferably, before welding, an angle grinder is used for cleaning and grinding the outer surface of the pipeline, the edge of the pipeline is 50mm, dirty oil and an oxidation layer are removed, and slag is cleaned;
preferably, the welding method adopts manual arc welding, the current is controlled to be 100A-130A, and the welding rod adopts J506
And
welding rod, implementing the welding standard GB 50236-2011.
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| CN202010632337.XA CN111946923A (en) | 2020-07-03 | 2020-07-03 | Pipeline opening sealing device and construction method for migrating and modifying gas main pipeline |
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| CN202010632337.XA CN111946923A (en) | 2020-07-03 | 2020-07-03 | Pipeline opening sealing device and construction method for migrating and modifying gas main pipeline |
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Cited By (1)
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| CN114198053A (en) * | 2021-12-13 | 2022-03-18 | 松原市云生石油技术服务有限公司 | Hole opening device with pressure for wellhead valve flashboard |
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