A large-diameter dust-removal pipeline pressure plugging construction method

Abstract

The present application relates to a kind of large-diameter dust removal pipeline with pressure plugging construction method, comprising 1) setting 2 annular hoops on plugging pipe section;2) multiple pairs of through holes are set on plugging pipe section and inserted into air pipe, and high-pressure airflow is passed to form a airflow barrier in plugging pipe section;3) completing the reconstruction of large-diameter dust removal pipeline under the condition of pressure plugging;4) removing air pipe while setting strip hoop to plug through hole;5) reinforcing plugging pipe section;The construction method described in the present application is simple and easy to operate, without special pressure plugging equipment, it can be completed using common materials and equipment at construction site, and the workload is small, the plugging effect is good, and the construction is safe and reliable;The plugging structure can be reused, which is convenient for subsequent construction again, and saves manpower and material resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline construction, in particular to a large-diameter dust removal pipeline pressure plugging construction method. BACKGROUND

[0002] In the process of metallurgical engineering construction, reconstruction and maintenance, it is often necessary to carry out split transport reconstruction, install devices, replace corroded pipe sections or repair under pressure for large-diameter dust removal pipelines with a diameter of 2-5 meters. The dust removal pipeline is generally under negative pressure, and cannot be constructed under normal production conditions. The conventional construction method is to stop production and then carry out pipeline construction, which has a greater impact on production and environmental protection, and is easy to cause economic losses and environmental pollution.

[0003] The realization of pipeline plugging under pressure can realize pipeline construction under normal production conditions. The currently commonly used pressure plugging technologies include the following:

[0004] 1) Cylinder plugging technology; suitable for pipelines with scale and corrosion on the inner wall, and non-standard deformed pipelines, generally used for production pipelines in oil fields and petrochemical systems; such as the "natural gas pipeline expansion cylinder type non-stop pressure plugging method" disclosed in Chinese patent application No. CN107588280A;

[0005] 2) Plug plugging technology; suitable for long-distance pipelines with standard pipeline and no scale and corrosion on the inner wall, mostly used for long-distance pipelines for transporting oil, natural gas and refined oil, and pipeline repair work; such as the "new high-pressure plug plugging machine" disclosed in Chinese utility model patent No. CN205013958U;

[0006] 3) Folded plugging head plugging technology; suitable for large-diameter pipeline plugging, with the characteristics of plugging large pipelines through small holes, suitable for long-distance pipelines for transporting oil, natural gas and refined oil, and pipeline repair work; such as the "variable diameter pipe foldable plugging head" disclosed in Chinese utility model patent No. CN202452030U, and the "plugging method for coal gas pipeline isolation operation" disclosed in Chinese patent application No. CN113932081A;

[0007] 4) Capsule plugging technology; refers to a way of plugging a pressurized pipeline with an air bag. It is mainly used for large-diameter water gas pipelines and has the characteristics of small hole diameter and large plugging pipe diameter. However, it is generally required that the plugging pressure be below 0.1 MPa due to the influence of pipeline pressure; such as the "high-pressure resistant air bag plugging system suitable for large-diameter tunnel and pipeline plugging" disclosed in Chinese utility model patent No. CN219432768U, and the "coal chemical pipeline damage plugging device" disclosed in Chinese utility model patent No. CN218818906U.

[0008] The above-mentioned pressure sealing devices all need to be configured with special sealing devices, and the construction process is complicated and long, and is not suitable for pressure sealing operation of large-diameter dust removal pipelines. SUMMARY

[0009] The present application provides a large-diameter dust removal pipeline pressure sealing construction method, which is simple and easy to operate, does not need special pressure sealing equipment, can be completed by using common materials and equipment on the construction site, has small operation amount, good sealing effect, safe and reliable construction, and the sealing structure can be reused, which is convenient for subsequent construction, saves manpower and material resources.

[0010] In order to achieve the above-mentioned purpose, the following technical scheme is adopted in the present application:

[0011] A large-diameter dust removal pipeline pressure sealing construction method, comprising the following steps:

[0012] 1) determining the position of the sealing pipe section on the upstream of the large-diameter dust removal pipeline to be operated, and setting 1 annular hoop at each end of the sealing pipe section;

[0013] 2) setting a plurality of through holes horizontally penetrating the sealing pipe section in the vertical direction on the sealing pipe section between the 2 annular hoops, inserting an air pipe after each pair of through holes is set, and sealing and fixing the air pipe between the two ends of the air pipe and the sealing pipe section; one end of the air pipe is closed, and the other end is connected with a high-pressure gas source through a connecting pipe; the part of the air pipe inserted into the sealing pipe section is provided with a plurality of gas outlets at the top and the bottom, respectively, and the high-pressure gas flow entering through the gas outlets on each air pipe forms an air flow barrier in the sealing pipe section, cutting off the dust-containing gas flow in the large-diameter dust removal pipeline, and realizing the pressure sealing of the large-diameter dust removal pipeline;

[0014] 4) completing the reconstruction operation of the large-diameter dust removal pipeline in the pressure sealing state;

[0015] 5) sequentially removing the air pipes, setting a strip hoop between the 2 annular hoops while removing the air pipes, closing the through holes after the air pipes are pulled out, and restoring the passage of the large-diameter dust removal pipeline after the air pipes are completely removed;

[0016] 6) reinforcing the sealing pipe section.

[0017] Further, in the step 1), the annular hoop is made of angle steel; according to the diameter specification of the large-diameter dust removal pipeline, the angle steel is rolled into a semicircle with a corresponding size, and the 2 semicircular angle steels are combined to form an annular hoop.

[0018] Further, the 2 angle steels forming the 2 annular hoops are arranged back to back, and one side surface is tightly attached to and welded with the outer wall of the sealing pipe section 2.

[0019] Further, the inner side distance of the two annular hoops is 100-300 mm.

[0020] Further, the high-pressure gas source is a compressed air source or an inert gas source.

[0021] Further, in the step 2), the method for opening the through holes and inserting the air pipes is that one through hole is opened on each side of the horizontal center line of the plugging pipe section and an air pipe is inserted; then symmetrically opening the through holes upward and downward on both sides of the plugging pipe section and inserting the air pipes; the air pipes are connected with the high-pressure gas source through the connecting pipes, and the check valve and the on-off valve are arranged on the connecting pipes; the air pipes and the through holes are sealed and fixed by the rubber rings.

[0022] Further, the air pipes are made of seamless steel pipes, and the distance between the air pipes is less than or equal to 300 mm.

[0023] Further, in the step 5), the air pipes are removed in sequence from top to bottom, and at the same time, the steel belts which are rolled into semicircles in advance are used to form a belt-shaped hoop between the two annular hoops to block the through holes; after one air pipe is removed, the corresponding through holes on both sides are blocked; during the blocking process, the steel belt is made to tightly adhere to the outer wall of the plugging pipeline by knocking, and the both ends of the steel belt are welded and fixed after being tightly adhered to the two annular hoops.

[0024] Further, in the step 6), the process of the reinforcing operation is that the rubber pads are arranged on the outside of the belt-shaped hoop, and the reinforcing hoops are arranged on the outside of the rubber pads by using steel plates; the steel plates are rolled into semicircles in advance, and the both ends of the semicircular steel plates are tightly connected by bolts.

[0025] Further, when the large-diameter dust removal pipeline needs to be blocked again under pressure in the future, the plugging pipe section is still used to block in the same way; when blocking again, only the reinforcing hoops and the rubber pads need to be removed in sequence, and the through holes and the annular hoops on the original plugging pipe section and the original air pipes are used for operation; after the operation is completed, the belt-shaped hoop and the rubber pad are replaced, and then the original reinforcing hoop is used for reinforcement.

[0026] Compared with the prior art, the beneficial effects of the present application are:

[0027] 1) The present application adopts the method for blocking the large-diameter dust removal pipeline under pressure without stopping production, which avoids the loss caused by stopping production and reduces the risk of environmental pollution;

[0028] 2) The construction method of the present application is simple and easy to operate, and does not need special equipment for blocking under pressure, but can be completed by using common materials and equipment at the construction site, and has the advantages of small operation amount, good blocking effect, safe and reliable construction;

[0029] 3) The construction method of the present invention can be used for construction tasks such as replacing large valves, pipe joints, and installing blind plates without stopping production in dust removal pipeline renovation projects;

[0030] 4) Short operation cycle, high plugging efficiency, and reduced construction costs;

[0031] 5) The plugging pipe section and the plugging and reinforcement structure provided in the construction method of the present invention can be reused, which is convenient for subsequent construction and saves manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the pressure plugging of the large-diameter dust removal duct according to the present invention (during plugging).

[0033] Figure 2 yes Figure 1 side view.

[0034] Figure 3 It is a schematic diagram of the pressure plugging of the large-diameter dust removal duct according to the present invention (after plugging).

[0035] Figure 4 It is a schematic diagram of the strip clamp blocking according to the present invention.

[0036] In the figure: 1. Large diameter dust removal duct 2. Blocking pipe section 3. Ring clamp 4. Ventilation pipe 5. Strip clamp DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0038] The invention provides a method for pressure plugging a large-diameter dust removal pipeline, comprising the following steps:

[0039] 1) If Figure 1 、 Figure 2 As shown, the position of the blocking pipe section 2 is determined upstream of the large-diameter dust removal pipe 1 that needs to be operated, and an annular clamp 3 is respectively provided at both ends of the blocking pipe section 2;

[0040] 2) On the blocking pipe section 2 between the two annular clamps 3, a number of through holes are opened in the vertical direction to horizontally penetrate the blocking pipe section 2. After each pair of through holes is opened, the ventilation pipe 4 is inserted, and the two ends of the ventilation pipe 4 are sealed and fixed to the blocking pipe section 2; one end of the ventilation pipe 4 is closed, and the other end is connected to the high-pressure air source through a connecting pipe; the part of the ventilation pipe 4 extending into the blocking pipe section 2 is respectively provided with a plurality of air outlet holes at the top and bottom, and the high-pressure airflow entering through the air outlet holes on each ventilation pipe 4 forms an airflow barrier in the blocking pipe section 2, cutting off the dust-laden airflow in the large-diameter dust removal pipe 1, thereby achieving pressure-sealed blocking of the large-diameter dust removal pipe 1;

[0041] 4) In the state of pressure plugging, the reconstruction work of the large-diameter dust removal pipeline 1 is completed;

[0042] 5) As shown in Figure 3 , Figure 4 , the vent pipe 4 is sequentially removed, the strip-shaped hoop 5 is arranged between the two annular hoops 3 during the removal, the through hole after the vent pipe 4 is extracted is closed, and after the vent pipe 4 is completely removed, the large-diameter dust removal pipeline 1 restores the passage;

[0043] 6) The reinforcing work is performed on the plugging pipe section 2.

[0044] Further, in the step 1), the annular hoop 3 is made of angle steel; according to the diameter specification of the large-diameter dust removal pipeline 1, the angle steel is rolled into a semicircle with a corresponding size, and the two semicircular angle steels are butted to form the annular hoop 3.

[0045] Further, the two angle steels constituting the two annular hoops 3 are arranged back to back, and one side surface thereof is tightly attached to and welded with the outer wall of the plugging pipe section 2.

[0046] Further, the inner side distance of the two annular hoops 3 is 100-300 mm.

[0047] Further, the high-pressure gas source is a compressed air source or an inert gas source.

[0048] Further, in the step 2), the method for opening the through hole and inserting the vent pipe 4 is that one through hole is opened on each side of the horizontal center line of the plugging pipe section 2 and the vent pipe 4 is inserted; then symmetrically upward and downward through holes are opened on both sides of the plugging pipe section 2 and the vent pipe 4 is inserted; the vent pipe 4 is connected with the high-pressure gas source in advance through a connecting pipe, and a check valve and an on-off valve are arranged on the connecting pipe; the vent pipe 4 and the through hole are sealed and fixed through a rubber ring.

[0049] Further, the vent pipe 4 is made of a seamless steel pipe, and the vent pipe spacing is ≤300 mm.

[0050] Further, in the step 5), the vent pipe 4 is sequentially removed from top to bottom, and at the same time, the strip-shaped hoop 5 is formed between the two annular hoops 3 by using the steel strip rolled into a semicircle in advance to plug the through hole; after one vent pipe 4 is removed, the corresponding two side through holes are immediately plugged; during the plugging process, the steel strip is tightly attached to the outer wall of the plugging pipeline 2 by knocking, and the two ends of the steel strip are tightly attached to the two annular hoops 3 and are welded and fixed respectively.

[0051] Further, in the step 6), the process of the reinforcing work is that a rubber pad is arranged outside the strip-shaped hoop 5, and a reinforcing hoop is arranged outside the rubber pad by using a steel plate; the steel plate is rolled into a semicircle in advance, and the two ends of the semicircular steel plate are tightly connected by bolts.

[0052] Further, when the large-diameter dust removal pipeline 1 needs to be blocked again under pressure in the future, the same method is still used to block the pipeline with the blocking pipe section 2. When blocking again, only the reinforcing clamps and rubber pads need to be removed in sequence, and the through holes and annular clamps 3 on the original blocking pipe section 2 and the original air pipe 4 are used for operation. After the operation is completed, the strip-shaped clamps 5 and rubber pads are replaced, and then the original reinforcing clamps are used for reinforcement.

[0053] The principle of the large-diameter dust removal pipeline blocking construction method is that first, double clamps are used to block the position of the large-diameter dust removal pipeline. Second, holes are opened in the large-diameter dust removal pipeline between the double clamps, and air pipes are inserted and fixed in sequence. High-pressure gas is introduced into the large-diameter dust removal pipeline through the air pipes to form an air flow barrier. Third, the pipeline operation is completed in the blocking state, and then the air pipes are removed in sequence. At the same time, strip-shaped clamps are used to block the holes after the air pipes are removed, and the pipeline passage is restored. Finally, the dust removal pipeline of the blocking section is reinforced, and the dust removal pipeline blocking task is completed.

[0054] The annular clamps are preferably made of angle steel, which is a common material at the construction site and easy to obtain and process. According to the diameter specification of the large-diameter dust removal pipeline, the angle steel is rolled into a semicircle so that it can fit the outer wall of the blocking pipe section, and then welded and fixed. The two annular clamps made of angle steel are arranged back to back, with a space in the middle for opening holes and inserting air pipes.

[0055] The sequence of opening holes and inserting air pipes is to start from the horizontal center line position of the blocking pipe section, open holes symmetrically on both sides and immediately insert air pipes. After the first air pipe is inserted and fixed, symmetrically opening holes and inserting air pipes are performed towards the upper and lower ends in sequence until a complete air flow barrier is formed.

[0056] The air pipe is made of steel pipe, preferably seamless steel pipe. The diameter of the air pipe can be determined according to the wind pressure and diameter of the large-diameter dust removal pipeline. The connecting pipe is preferably a flexible pipe.

[0057] After the large-diameter dust removal pipeline is blocked, related operations can be performed. After the operation is completed, the air pipes are removed in sequence from top to bottom, and strip-shaped clamps are used to block the through holes between the two annular clamps by using the steel strips rolled into a semicircle in advance. One air pipe is removed and immediately blocked at the same time. During the blocking process, knocking or other methods can be used to make the steel strip tightly fit the outer wall of the blocking pipe section and tightly contact the annular clamps, and then the steel strip and the annular clamps are welded.

[0058] In order to improve the efficiency of the through hole plugging, preferably first with thin steel band made of band hoop plugging pipe section of the outer wall wrapped, in order to strengthen the strength of the wrapped, and then with the pre-rolled into a semicircle thick steel band for secondary wrapping, thick steel band made of reinforcing hoop with bolt connection mode at both ends, and the reinforcing hoop and band hoop between the rubber pad, the inner diameter of the reinforcing hoop and the wrapping tightness adjustable, in the case of no welding with the pipeline, to ensure the sealing and strength of the plugging pipe section.

[0059] The plugging pipe section and the plugging and reinforcing structure in the large-diameter dust removal pipeline pressure plugging construction method can be reused, facilitating subsequent construction again, and saving manpower and material resources.

[0060] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art in the technical range disclosed by the present application, according to the technical scheme and the inventive concept of the present application to make equivalent replacement or change, should be covered in the protection scope of the present application.

Claims

1. A construction method for pressure plugging of large-diameter dust removal pipelines, characterized in that: The steps include: 1) Determine the location of the plugging pipe section upstream of the large-diameter dust removal pipe where the operation is required, and install an annular clamp at each end of the plugging pipe section; 2) On the blocking pipe section between the two annular clamps, a number of through holes are opened in the vertical direction to horizontally penetrate the blocking pipe section. After each pair of through holes is opened, a ventilation pipe is inserted, and the two ends of the ventilation pipe are sealed and fixed to the blocking pipe section; one end of the ventilation pipe is closed, and the other end is connected to the high-pressure gas source through a connecting pipe; the method of opening the through holes and inserting the ventilation pipe is as follows: a through hole is opened on both sides of the horizontal center line of the blocking pipe section and the ventilation pipe is inserted; then symmetrical through holes are opened upward and downward on both sides of the blocking pipe section and the ventilation pipe is inserted; the ventilation pipe is connected to the high-pressure gas source in advance through a connecting pipe, and a check valve and a switch valve are provided on the connecting pipe; the ventilation pipe and the through hole are sealed and fixed by a rubber ring; the part of the ventilation pipe extending into the blocking pipe section is provided with multiple air outlets at the top and bottom, respectively, and the high-pressure airflow entering through the air outlets on each ventilation pipe forms an airflow barrier in the blocking pipe section, cutting off the dust-laden airflow in the large-diameter dust removal pipe, thereby realizing pressurized sealing of the large-diameter dust removal pipe; 3) Complete the transformation of large-diameter dust removal pipelines under pressure plugging; 4) Remove the ventilation pipes one by one, and set a strip clamp between the two ring clamps while removing them to seal the through hole after the ventilation pipe is pulled out. After all the ventilation pipes are removed, the large-diameter dust removal pipe is restored to the passage. Specifically, the ventilation pipes are removed in order from top to bottom, and at the same time, a semicircular steel strip is used to form a strip clamp between the two ring clamps to seal the through hole. After removing a ventilation pipe, the corresponding through holes on both sides are immediately blocked. During the blocking process, the steel strip is pressed against the outer wall of the blocked pipe by knocking. The two ends of the steel strip are tightly attached to the two ring clamps and then welded and fixed. 5) Reinforce the blocked pipe section. The reinforcement process is as follows: first, place a rubber pad on the outside of the band clamp, and then use a steel plate to reinforce the clamp on the outside of the rubber pad. The steel plate is rolled into a semicircle in advance, and the two ends of the semicircular steel plate are fastened together by bolts.

2. A large diameter dust removal pipeline pressure plugging construction method according to claim 1, characterized in that: In the step 1), the annular clamp is made of angle steel; according to the diameter specification of the large-diameter dust removal pipe, the angle steel is rolled into a semicircle with corresponding size, and two sections of semicircular angle steel are joined to form the annular clamp.

3. A large diameter dust removal pipeline pressure plugging construction method according to claim 2, characterized in that: The two angle steels constituting the two annular clamps are arranged back to back, with one side surface thereof being tightly attached to and welded to the outer wall of the blocking pipe section 2.

4. A large diameter dust removal pipeline pressure plugging construction method according to claim 1, characterized in that: The inner side spacing between the two annular hoops is 100 to 300 mm.

5. A large diameter dust removal pipeline pressure plugging construction method according to claim 1, characterized in that: The high-pressure gas source is a compressed air source or an inert gas source.

6. A large diameter dust removal pipeline pressure plugging construction method according to claim 1, characterized in that: The ventilation pipe is made of seamless steel pipe, and the spacing between the ventilation pipes is ≤300mm.

7. A large diameter dust removal pipeline pressure plugging construction method according to claim 1, characterized in that: When the large-diameter dust removal pipe needs to be plugged under pressure again in the future, it can be plugged in the same way using the plugging pipe section. When plugging again, it is only necessary to remove the reinforcement clamp and rubber pad in sequence, and use the through hole and annular clamp on the original plugging pipe section and the original ventilation pipe to operate. After the operation is completed, replace the band clamp and rubber pad, and then use the original reinforcement clamp for reinforcement.

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