Gas pipeline with gas connection construction method

Abstract

The application discloses a natural gas pipeline with gas connecting pipe construction method, which is realized by a natural gas pipeline with gas connecting pipe construction equipment, and the natural gas pipeline with gas connecting pipe construction equipment comprises a main pipeline body, fixed rings are fixedly installed on both sides of the outer surface of the main pipeline body, a supporting plate is movably installed between the two groups of fixed rings, a supporting pipe is placed in the middle of the upper end of the supporting plate, a positioning mechanism is arranged at the rear end of the supporting pipe, a sealing mechanism is arranged in the middle of the front end of the positioning mechanism, an adsorption mechanism is arranged at the rear part of the sealing mechanism, and a pre-welded branch pipe is inserted into the outer surface of the positioning mechanism. Through the adsorption mechanism, the cut pipe wall cannot fall into the pipeline of the main pipeline body, through the sealing mechanism, the area space to be detected is reduced, the inflow amount of detection gas is reduced, a large amount of detection gas is saved, the detection time is improved, and the construction speed is improved.

Description

Technical Field

[0001] The present invention relates to the field of natural gas pipeline construction equipment, and in particular to a natural gas pipeline gas connection construction method. Background Art

[0002] After natural gas pipelines are put into operation, user growth and urban road construction necessitate the extension of main pipelines, the opening of branch pipes, the installation of gas connections to end users, and major pipeline repairs. Gas pipeline installation is essential, but a mature method for connecting gas connections has yet to be developed. Natural gas is flammable, explosive, and harmful to human health, and a leak poses a direct threat to life and property.

[0003] In the construction of natural gas pipeline connection, the traditional method is to close the stop valves at both ends of the main pipeline section that needs to be connected, use the relief valve to release the residual natural gas in the natural gas main pipeline in the section, and judge whether the residual natural gas in the main pipeline has been discharged by observing the pressure condition in the main pipeline. Then, the main pipeline in the pre-connected area is oxygen-welded and cut, the pipe wall is removed, and the prefabricated branch pipeline is welded. After welding, the stop valve is opened and soap solution is used to observe whether the welding area is leaking. After that, the joint is treated with anti-corrosion and the gas supply can be restored. In the traditional construction method, after the prefabricated pipe is welded, gas needs to be introduced into the main pipeline to detect whether the welding is leaking, and the stop valves at both ends of the main pipeline are closed. Valves are generally spaced far apart, and a large amount of monitoring gas needs to be introduced for detection. If a leak is detected at the welding point, the stop valves at both ends of the main pipeline need to be closed again to release the natural gas in the main pipeline again, which wastes a lot of natural gas. It takes a long time for the natural gas to fill the main pipeline area, which prolongs the working time. Secondly, when oxygen welding is used to cut the pre-branching area of ​​the main pipeline, the main pipeline wall has an anti-corrosion layer, which is relatively smooth. The cut main pipeline wall is easy to fall into the main pipeline, and the wall that falls into the main pipeline is easy to slide to other places, causing the staff to spend a lot of time looking for the cut wall. For this reason, we propose a construction method for natural gas pipeline with gas connection. Summary of the Invention

[0004] The main purpose of the present invention is to provide a construction method for gas pipe connection of natural gas pipeline, which can effectively solve the problems in the background technology of large amount of detection gas consumption, long detection time and easy falling of cut pipe wall into the main pipeline.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for constructing a gas-filled pipe connection for a natural gas pipeline is implemented by equipment for constructing a gas-filled pipe connection for a natural gas pipeline. The equipment for constructing a gas-filled pipe connection for a natural gas pipeline includes a main pipeline body, fixed collars are fixedly installed on both sides of the outer surface of the main pipeline body, a support plate is movably installed between two groups of the fixed collars, a support pipe is placed in the middle of the upper end of the support plate, a positioning mechanism is provided at the rear end of the support pipe, a sealing mechanism is provided at the middle of the front end of the positioning mechanism, an adsorption mechanism is provided at the rear of the sealing mechanism, and a pre-welded branch pipe is plugged into the outer surface of the positioning mechanism.

[0007] Preferably, a plurality of evenly distributed through holes are provided on the rear portion of the outer surface of the support tube, and an arc-shaped notch is provided at the rear end of the support tube, the curvature of the arc-shaped notch matches the curvature of the outer surface of the main pipe body.

[0008] Preferably, the positioning mechanism includes a positioning plate, an annular sealing ring, an I-shaped slide groove and an I-shaped slide rod. The side of the outer surface of the positioning plate is fixedly connected with an annular sealing ring. A group of I-shaped slide grooves are opened on the left and right sides of the rear end of the positioning plate. The I-shaped slide grooves are slidably connected with I-shaped slide rods. The positioning mechanism is fixedly connected to the support tube through the positioning plate.

[0009] Preferably, a group of fitting slots are provided on both sides of the left and right sides of the rear cavity wall of the I-shaped slide, a group of positioning blocks are fixedly connected to the rear ends of the fitting slots, a group of positioning rods are movably connected to the rear ends of the positioning blocks, a group of springs are sleeved on the outer surfaces of the positioning rods, the front and rear ends of the springs are fixedly connected to the positioning blocks and the I-shaped slide rods respectively, and the rear ends of the positioning rods are fixedly connected to the I-shaped slide rod.

[0010] Preferably, the sealing mechanism includes a connecting rod, an elastic arc-shaped sealing block, an extrusion block, a push rod and an adjusting knob. The rear end of the connecting rod is fixedly connected to the elastic arc-shaped sealing block, the rear part of the outer surface of the connecting rod is movably connected to the extrusion block, and the edge parts of the extrusion block are all fitted and slidably connected with the inside of the elastic arc-shaped sealing block. The front end of the extrusion block is movably installed with two groups of symmetrically distributed push rods, the front ends of the push rods are all inserted through the positioning plate and fixedly connected with a group of adjusting knobs, and the push rods are all threadedly connected to the positioning plate. The connecting rod is threadedly connected to the positioning plate to movably install the sealing mechanism on the positioning plate.

[0011] Preferably, a detection air pipe is plugged into the front end of the connecting rod, a valve is fixedly installed at the front end of the detection air pipe, and a diversion port is fixedly connected to the rear end port of the detection air pipe.

[0012] Preferably, a sealing rubber ring is fixedly connected to the front port of the elastic arc-shaped sealing block, and a Y-shaped adsorption ring is fixedly connected to the front end of the sealing rubber ring.

[0013] Preferably, the adsorption mechanism includes an arc block, a connecting block, an arc groove, an arc adsorption plate and an extrusion exhaust plate. The middle part of the right side of the outer surface of the arc block is movably connected with a connecting block, the middle part of the left side of the arc block is provided with an arc groove, the left notch of the arc groove is fixedly connected with an arc adsorption plate, the left end of the connecting block is fixedly connected with an extrusion exhaust plate, the extrusion exhaust plate is slidably connected to the arc groove, and the right part of the connecting block is fixedly connected to the elastic arc sealing block to fix the adsorption mechanism and the sealing mechanism together.

[0014] Preferably, the natural gas pipeline gas connection construction method comprises the following steps:

[0015] S1. Determine the pre-drilled area on the outer surface of the main pipe body that needs to be pre-piped, mark it, and draw a circle. Fix the fixed loops on both sides of the marked area. Install the support plate movably between the two sets of fixed loops, aligning the middle position of the support plate with the center of the marked area. Place the support tube on the support plate, and align the arc-shaped adsorption plate in the adsorption mechanism with the center of the marked area.

[0016] S2. Move the support tube so that the arc-shaped adsorption plate is attached to the center of the marked area of ​​the main pipe body. Press the support tube so that the connecting block in the adsorption mechanism pushes against the extrusion exhaust plate and moves the arc-shaped adsorption plate in the arc groove to expel the air between the arc-shaped adsorption plate and the main pipe body. The arc-shaped adsorption plate and the main pipe body are adsorbed together. Use oxygen welding to cut the marked circle area. The cut main pipe wall is adsorbed on the arc-shaped adsorption plate on the adsorption mechanism.

[0017] S3. Press the support tube to fit the arc-shaped notch with the outer surface of the main pipe body. Adjust the connecting rod so that the elastic arc-shaped sealing block is completely inside the main pipe body. Adjust the adjusting knob so that the push rod squeezes the squeezing block, and the squeezing block squeezes the elastic arc-shaped sealing block. The opening of the elastic arc-shaped sealing block expands, covering the entire opening from the inside of the main pipe body. Adjust the connecting rod so that the entire elastic arc-shaped sealing block is buckled and covered from the inside of the main pipe body. Tighten the connecting rod so that the Y-shaped adsorption ring is adsorbed on the inner wall of the main pipe body.

[0018] S4. Insert the pre-welded branch pipe into the positioning plate along the direction of the positioning plate, and fit the rear end of the pre-welded branch pipe to the outer surface of the main pipe body. The pre-welded branch pipe covers the circled area of ​​the main pipe body. Use a welding machine to weld the pre-welded branch pipe to the main pipe body, and wait for the welding area to cool.

[0019] S5. Fill the test gas from the valve. The test gas enters the sealed space formed by the pre-welded branch pipe, positioning plate, main pipe body wall and elastic arc-shaped sealing block from the test gas pipe diversion port. The filled test gas squeezes the I-type slide rod to move outward until the front end of the I-type slide rod is completely pushed out of the I-type slide groove, then stop filling the test gas, close the valve, wait for a while, and observe whether the I-type slide rod moves inward under the action of the spring. If it does not move, it means that there is no gap in the welding part of the welded pre-welded branch pipe. Adjust the connecting rod to loosen the elastic arc-shaped sealing block, and take out the pre-welded branch pipe together with the cut pipe wall adsorbed on the arc adsorption plate to complete the welding. If the I-type slide rod moves inward, it means that there is a gas leak between the welded pre-welded branch pipe and the main pipe body. Open the valve to discharge the test gas, repair the joint, and then repeat the filling of the test gas to check whether there is a gap in the welding again.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By setting up an adsorption mechanism, an arc block, a connecting block, an arc groove, an arc adsorption plate and an extrusion exhaust plate are set in the adsorption mechanism. By pressing the connecting block, the extrusion exhaust plate moves in the arc groove, and the gas between the arc adsorption plate and the main pipe body is squeezed out, so that the arc adsorption plate and the center of the marked area of ​​the main pipe body are adsorbed together. When the oxygen welding cutting cuts the marked circle area, the cut pipe wall will not fall into the pipe of the main pipe body, but will be adsorbed on the arc adsorption plate. After the entire welding process is completed, the main pipe body is taken out, thereby improving the working efficiency of the entire welding branch pipe.

[0022] 2. By setting a positioning mechanism, a positioning plate, an annular sealing ring, an I-shaped slide groove and an I-shaped slide rod are set in the positioning mechanism, and an annular sealing ring is set on the side of the positioning plate. When welding the pre-welded branch pipe, the pre-welded branch pipe is directly plugged into the positioning plate and pushed until it matches the main pipe body for welding, which is convenient for the staff to quickly locate the position of the welding pre-welded branch pipe and the main pipe body, and facilitate the staff to weld.

[0023] 3. A sealing mechanism is provided in which a connecting rod, an elastic arc-shaped sealing block, an extrusion block, a push rod and an adjusting knob are provided. By rotating the adjusting knob, the extrusion block squeezes the elastic arc-shaped sealing block to enlarge the port of the elastic arc-shaped sealing block. The elastic arc-shaped sealing block with the enlarged port is then covered in the cutting area from the inside of the main pipe body to form a sealed space with the positioning plate, the pre-welded branch pipe and the main pipe body. The detection gas is then introduced from the valve, which reduces the area to be detected, thereby reducing the amount of detection gas introduced, saving a large amount of detection gas, and also improving the detection time and the construction speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a schematic structural diagram of an overall top view of a method for constructing a natural gas pipeline with gas connection pipe according to the present invention;

[0025] Figure 2 It is a top sectional view of the sealing mechanism of the natural gas pipeline gas connection pipe construction method of the present invention;

[0026] Figure 3 This is an enlarged view of point A of the natural gas pipeline gas connection construction method of the present invention;

[0027] Figure 4 A top sectional view of a positioning mechanism of a natural gas pipeline gas connection pipe construction method according to the present invention;

[0028] Figure 5 This is an enlarged view of point B of the natural gas pipeline gas connection construction method of the present invention;

[0029] Figure 6 A side sectional view of an adsorption mechanism of a natural gas pipeline gas connection pipe construction method according to the present invention;

[0030] Figure 7 A side view of a support pipe for a natural gas pipeline with a gas connection pipe construction method according to the present invention;

[0031] Figure 8 This is a top sectional view of the elastic arc-shaped sealing block of the natural gas pipeline with gas connection pipe construction method of the present invention, which is covered on the inner wall of the main pipeline body after being expanded.

[0032] In the figure: 1. Main pipe body; 2. Fixed loop; 3. Support plate; 4. Support pipe; 41. Through hole; 42. Arc-shaped notch; 5. Positioning mechanism; 51. Positioning plate; 52. Annular sealing ring; 53. I-shaped slide groove; 531. Fitting slot; 532. Positioning plug block; 533. Positioning plug rod; 534. Spring; 54. I-shaped slide rod; 6. Sealing mechanism; 61. Connecting rod; 611. Detection air pipe; 612. Valve; 613. Diversion port; 62. Elastic arc-shaped sealing block; 621. Sealing rubber ring; 622. Y-type adsorption ring; 63. Extrusion block; 64. Push rod; 65. Adjustment knob; 7. Adsorption mechanism; 71. Arc block; 72. Connecting block; 73. Arc groove; 74. Arc adsorption plate; 75. Extrusion exhaust plate; 8. Pre-welded branch pipe. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] like Figure 1-8 As shown, a method for constructing a gas-carrying pipe connecting a natural gas pipeline is implemented by equipment for constructing a gas-carrying pipe connecting a natural gas pipeline. The equipment for constructing a gas-carrying pipe connecting a natural gas pipeline includes a main pipeline body 1, fixed collars 2 are fixedly installed on both sides of the outer surface of the main pipeline body 1, a support plate 3 is movably installed between the two groups of fixed collars 2, a support pipe 4 is placed in the middle of the upper end of the support plate 3, a positioning mechanism 5 is provided at the rear end of the support pipe 4, a sealing mechanism 6 is provided in the middle of the front end of the positioning mechanism 5, an adsorption mechanism 7 is provided at the rear of the sealing mechanism 6, and a pre-welded branch pipe 8 is inserted into the outer surface of the positioning mechanism 5.

[0037] A plurality of evenly distributed through holes 41 are provided at the rear of the outer surface of the support tube 4, and an arc-shaped notch 42 is provided at the rear end of the support tube 4. The curvature of the arc-shaped notch 42 matches the curvature of the outer surface of the main pipe body 1. The arc-shaped notch 42 facilitates the support tube 4 to be placed on the surface of the main pipe body 1, and facilitates the detection of whether there is leakage at the welding position after welding the pre-welded branch pipe 8.

[0038] The positioning mechanism 5 includes a positioning plate 51, an annular sealing ring 52, an I-shaped slide groove 53 and an I-shaped slide rod 54. The side of the outer surface of the positioning plate 51 is fixedly connected with an annular sealing ring 52. A group of I-shaped slide grooves 53 are opened on the left and right sides of the rear end of the positioning plate 51. The I-shaped slide rods 54 are slidably connected in the I-shaped slide grooves 53. The positioning mechanism 5 is fixedly connected to the support tube 4 through the positioning plate 51. The annular sealing ring 52 is convenient for sealing the space formed by the positioning plate 51 and the pre-welded branch pipe 8 when the pre-welded branch pipe 8 is plugged in, and the positioning plate 51 makes it convenient for the staff to put the pre-welded branch pipe 8 more accurately on the marked circled position.

[0039] A group of fitting slots 531 are provided on both sides of the rear cavity wall of the I-type slide 53, and a group of positioning blocks 532 are fixedly connected to the rear ends of the fitting slots 531. A group of positioning plugs 533 are movably connected to the rear ends of the positioning plugs 532, and a group of springs 534 are sleeved on the outer surfaces of the positioning plugs 533. The front and rear ends of the springs 534 are fixedly connected to the positioning plugs 532 and the I-type slide 54 respectively, and the rear end of the positioning plugs 533 is fixedly connected to the I-type slide 54, so as to remind the staff that the amount of detection gas filled has reached the trigger condition during detection, and to remind the staff in the subsequent sequence whether there is a gas leak at the welding point.

[0040] The sealing mechanism 6 includes a connecting rod 61, an elastic arc-shaped sealing block 62, an extrusion block 63, a push rod 64 and an adjusting knob 65. The rear end of the connecting rod 61 is fixedly connected to the elastic arc-shaped sealing block 62, and the rear part of the outer surface of the connecting rod 61 is movably connected to the extrusion block 63, and the edge parts of the extrusion block 63 are all fitted and slidably connected to the inside of the elastic arc-shaped sealing block 62. The front end of the extrusion block 63 is movably installed with two groups of symmetrically distributed push rods 64, and the front ends of the push rods 64 are all inserted through the positioning plate 51 and fixedly connected to a group of adjusting knobs 65, and the push rods 64 are all threadedly connected to the positioning plate 51. The connecting rod 61 is threadedly connected to the positioning plate 51 to movably install the sealing mechanism 6 on the positioning plate 51, so as to facilitate the formation of a sealed space in the welding area from the inside of the main pipe body 1, and cooperate with the positioning plate 51, the pre-welded branch pipe 8 and the main pipe body 1 to form a smaller closed space, thereby reducing the amount of detection gas introduced during detection and, at the same time, reducing the detection time.

[0041] A detection gas pipe 611 is inserted into the front end of the connecting rod 61 , a valve 612 is fixedly installed at the front end of the detection gas pipe 611 , and a diversion port 613 is fixedly connected to the rear end of the detection gas pipe 611 to facilitate the introduction of detection gas.

[0042] A sealing rubber ring 621 is fixedly connected to the front end of the elastic arc-shaped sealing block 62 , and a Y-shaped adsorption ring 622 is fixedly connected to the front end of the sealing rubber ring 621 to facilitate maintaining sealing of the area covered by the elastic arc-shaped sealing block 62 .

[0043] Preferably, the adsorption mechanism 7 includes an arc block 71, a connecting block 72, an arc groove 73, an arc adsorption plate 74 and an extrusion exhaust plate 75. The connecting block 72 is movably connected to the middle part of the right side of the outer surface of the arc block 71, and an arc groove 73 is opened in the middle part of the left side of the arc block 71. The arc adsorption plate 74 is fixedly connected to the notch on the left side of the arc groove 73. The left end of the connecting block 72 is fixedly connected to the extrusion exhaust plate 75. The extrusion exhaust plate 75 is slidingly connected to the arc groove 73. The right part of the connecting block 72 is fixedly connected to the elastic arc sealing block 62 to fix the adsorption mechanism 7 and the sealing mechanism 6 together, so as to facilitate the adsorption of the pipe wall cut by oxygen welding on the arc adsorption plate 74 to prevent the pipe wall from falling into the inner tube of the main pipe body 1.

[0044] The construction method of natural gas pipeline gas connection pipe includes the following steps:

[0045] S1. Determine the pre-drilled area on the outer surface of the main pipe body 1 that needs to be pre-piped, mark it, and draw a circle. Fix the fixed snares 2 on both sides of the marked area. Movably install the support plate 3 between the two sets of fixed snares 2, aligning the middle position of the support plate 3 with the center of the marked area. Place the support tube 4 on the support plate 3, and align the arc-shaped adsorption plate 74 of the adsorption mechanism 7 with the center of the marked area.

[0046] S2. Move the support tube 4 so that the arc-shaped adsorption plate 74 is attached to the center of the marked area of ​​the main pipe body 1. Press the support tube 4 so that the connecting block 72 in the adsorption mechanism 7 pushes against the extrusion exhaust plate 75 and moves the arc-shaped adsorption plate 74 in the arc groove 73 to expel the air between the arc-shaped adsorption plate 74 and the main pipe body 1. The arc-shaped adsorption plate 74 and the main pipe body 1 are adsorbed together. Use oxygen welding to cut the marked circle area. The cut main pipe wall is adsorbed on the arc-shaped adsorption plate 74 on the adsorption mechanism 7.

[0047] S3. Press the support tube 4 to fit the arc-shaped notch 42 with the outer surface of the main pipe body 1. Adjust the connecting rod 61 so that the elastic arc-shaped sealing block 62 is completely inside the main pipe body 1. Adjust the adjusting knob 65 so that the push rod 64 squeezes the squeezing block 63. The squeezing block 63 squeezes the elastic arc-shaped sealing block 62. The opening of the elastic arc-shaped sealing block 62 expands, covering the entire opening from the inside of the main pipe body 1. Adjust the connecting rod 61 again so that the entire elastic arc-shaped sealing block 62 is pressed and covered from the inside of the main pipe body 1. Tighten the connecting rod 61 so that the Y-shaped adsorption ring 622 is adsorbed on the inner wall of the main pipe body 1.

[0048] S4. Insert the pre-welded branch pipe 8 onto the positioning plate 51 along the direction of the positioning plate 51, and fit the rear portion of the pre-welded branch pipe 8 to the outer surface of the main pipe body 1. The pre-welded branch pipe 8 covers the circled area of ​​the main pipe body 1. Use a welding machine to weld the pre-welded branch pipe 8 to the main pipe body 1, and wait for the welded area to cool.

[0049] S5. Fill the test gas from the valve 612. The test gas enters the sealed space formed by the pre-welding branch pipe 8, the positioning plate 51, the main pipeline body 1 wall and the elastic arc sealing block 62 through the diversion port 613 of the test gas pipe 611. The filled test gas squeezes the type slide rod 54 to move outward until the front end of the type slide rod 54 completely pushes out the type slide groove 53 and stops filling the test gas. Close the valve 612 and wait for a while to observe whether the type slide rod 54 moves inward under the action of the spring 534. If it does not move, it means that there is no gap in the welding part of the welded pre-welding branch pipe 8. Adjust the connecting rod 61 to loosen the elastic arc sealing block 62, and take out the pre-welding branch pipe 8 together with the cut pipe wall adsorbed on the arc adsorption plate 74 to complete the welding. If the type slide rod 54 moves inward, it means that there is a gas leak between the welded pre-welding branch pipe 8 and the main pipeline body 1. Open the valve 612 to discharge the test gas, repair the joint, and then repeat the filling of the test gas to check whether there is a gap in the welding.

[0050] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a natural gas pipeline with gas connection, characterized by: The method for constructing a natural gas pipeline with gas pipes is realized by using equipment for constructing a natural gas pipeline with gas pipes. The equipment for constructing a natural gas pipeline with gas pipes comprises a main pipeline body (1), fixed rings (2) are fixedly installed on both sides of the outer surface of the main pipeline body (1), a support plate (3) is movably installed between two groups of the fixed rings (2), a support pipe (4) is placed in the middle of the upper end of the support plate (3), a positioning mechanism (5) is provided at the rear end of the support pipe (4), a sealing mechanism (6) is provided at the middle of the front end of the positioning mechanism (5), and an adsorption mechanism (7) is provided at the rear end of the sealing mechanism (6) to facilitate adsorption of the pipeline wall cut by oxygen welding on the adsorption mechanism (7) to prevent the pipeline wall from falling into the inner pipe of the main pipeline body (1), and a pre-welded branch pipe (8) is inserted into the outer surface of the positioning mechanism (5); the positioning mechanism (5) comprises a positioning plate (51), the sealing mechanism (6) includes a connecting rod (61), an elastic arc-shaped sealing block (62), an extrusion block (63), a push rod (64) and an adjusting knob (65), the rear end of the connecting rod (61) is fixedly connected to the elastic arc-shaped sealing block (62), the rear portion of the outer surface of the connecting rod (61) is movably connected to the extrusion block (63), and the edge of the extrusion block (63) is slidably connected to the inside of the elastic arc-shaped sealing block (62), the front end of the extrusion block (63) is movably installed with two groups of symmetrically distributed push rods (64), the front ends of the push rods (64) are all inserted through the positioning plate (51) and fixedly connected to a group of adjusting knobs (65), and the push rods (64) are all threadedly connected to the positioning plate (51), and the connecting rod (61) is threadedly connected to the positioning plate (51) to movably install the sealing mechanism (6) on the positioning plate (51).

2. The method for constructing a natural gas pipeline with gas connection according to claim 1, characterized in that: The rear portion of the outer surface of the support tube (4) is provided with a plurality of evenly distributed through holes (41), and the rear end of the support tube (4) is provided with an arc-shaped notch (42), the curvature of the arc-shaped notch (42) matching the curvature of the outer surface of the main pipe body (1).

3. The method for constructing a natural gas pipeline with gas connection according to claim 2, characterized in that: The positioning mechanism (5) further comprises an annular sealing ring (52), an I-shaped slide groove (53) and an I-shaped slide rod (54); the annular sealing ring (52) is fixedly connected to the side of the outer surface of the positioning plate (51); a group of I-shaped slide grooves (53) are respectively provided on the left and right sides of the rear end of the positioning plate (51); and the I-shaped slide rods (54) are slidably connected in the I-shaped slide grooves (53); the positioning mechanism (5) is fixedly connected to the support tube (4) via the positioning plate (51).

4. The method for constructing a natural gas pipeline with gas connection according to claim 3, characterized in that: A group of fitting slots (531) are provided on both sides of the left and right sides of the rear cavity wall of the I-shaped slide (53), a group of positioning plugs (532) are fixedly connected to the rear ends of the fitting slots (531), a group of positioning plugs (533) are movably plugged into the rear ends of the positioning plugs (532), a group of springs (534) are sleeved on the outer surfaces of the positioning plugs (533), the front and rear ends of the springs (534) are fixedly connected to the positioning plugs (532) and the I-shaped slide (54), respectively, and the rear ends of the positioning plugs (533) are fixedly connected to the I-shaped slide (54).

5. The method for constructing a natural gas pipeline with gas connection according to claim 4, characterized in that: A detection air pipe (611) is plugged into the front end of the connecting rod (61), a valve (612) is fixedly installed at the front end of the detection air pipe (611), and a diversion port (613) is fixedly connected to the rear end port of the detection air pipe (611).

6. The method for constructing a natural gas pipeline with gas connection according to claim 5, characterized in that: A sealing rubber ring (621) is fixedly connected to the front end of the elastic arc-shaped sealing block (62), and a Y-shaped adsorption ring (622) is fixedly connected to the front end of the sealing rubber ring (621).

7. The method for constructing a natural gas pipeline with gas connection according to claim 6, characterized in that: The adsorption mechanism (7) comprises an arc block (71), a connecting block (72), an arc groove (73), an arc adsorption plate (74) and an extrusion exhaust plate (75). The middle portion of the right side of the outer surface of the arc block (71) is movably connected to the connecting block (72). The middle portion of the left side of the arc block (71) is provided with an arc groove (73). The arc adsorption plate (74) is fixedly connected to the notch of the left portion of the arc groove (73). The left end of the connecting block (72) is fixedly connected to the extrusion exhaust plate (75). The extrusion exhaust plate (75) is slidably connected to the arc groove (73). The right portion of the connecting block (72) is fixedly connected to the elastic arc sealing block (62), thereby fixedly connecting the adsorption mechanism (7) and the sealing mechanism (6) together.

8. The method for constructing a natural gas pipeline with gas connection according to claim 7, characterized in that: The method for constructing a natural gas pipeline with gas connection includes the following steps: S1. Determine the pre-opening area on the outer surface of the main pipe body (1) to be pre-piped, mark and circle it, fix the fixed ring (2) on both sides of the marked area, movably install the support plate (3) between the two sets of fixed rings (2), align the middle position of the support plate (3) with the center of the marked area, place the support pipe (4) on the support plate (3), and align the arc-shaped adsorption plate (74) in the adsorption mechanism (7) with the center of the marked area; S2, move the support tube (4) so ​​that the arc adsorption plate (74) is attached to the center of the marked area of ​​the main pipe body (1), press the support tube (4), so that the connecting block (72) in the adsorption mechanism (7) pushes against the extrusion exhaust plate (75) to move the arc adsorption plate (74) in the arc groove (73), discharge the air between the arc adsorption plate (74) and the main pipe body (1), and adsorb the arc adsorption plate (74) and the main pipe body (1) together, use oxygen welding to cut the marked circle area, and the cut main pipe wall is adsorbed on the arc adsorption plate (74) on the adsorption mechanism (7); S3. At this time, press the support tube (4) to make the arc-shaped notch (42) fit with the outer surface of the main pipe body (1), adjust the connecting rod (61) so that the elastic arc-shaped sealing block (62) is completely inside the main pipe body (1) pipe, adjust the adjusting knob (65) so that the top rod (64) squeezes the squeezing block (63), and the squeezing block (63) squeezes the elastic arc-shaped sealing block (62), and the opening of the elastic arc-shaped sealing block (62) is expanded to cover the entire opening position from the inside of the main pipe body (1), and then adjust the connecting rod (61) so that the entire elastic arc-shaped sealing block (62) is buckled and covered from the inside of the main pipe body (1) to cover the opening area, and tighten the connecting rod (61) so that the Y-shaped adsorption ring (622) is adsorbed on the inner wall of the main pipe body (1); S4. Insert the pre-welded branch pipe (8) onto the positioning plate (51) along the direction of the positioning plate (51), and fit the rear portion of the pre-welded branch pipe (8) to the outer surface of the main pipe body (1). The pre-welded branch pipe (8) covers the circled area of ​​the main pipe body (1). Use a welding machine to weld the pre-welded branch pipe (8) and the main pipe body (1) together, and wait for the welding area to cool. S5. Fill the test gas from the valve (612). The test gas enters the sealed space formed by the pre-welded branch pipe (8), the positioning plate (51), the main pipe body (1) wall and the elastic arc-shaped sealing block (62) from the branch port (613) of the test gas pipe (611). The filled test gas squeezes the type slide rod (54) to move outward until the front end of the type slide rod (54) is completely pushed out of the type slide groove (53). Stop filling the test gas, close the valve (612), wait for a while, and observe whether the type slide rod (54) is under the action of the spring (534). Move inwards. If there is no movement, it means that there is no gap in the welded part of the pre-welded branch pipe (8). Adjust the connecting rod (61) to loosen the elastic arc-shaped sealing block (62), and remove the pre-welded branch pipe (8) together with the cut pipe wall adsorbed on the arc-shaped adsorption plate (74) to complete the welding. If the I-type slide bar (54) moves inwards, it means that there is a gas leak between the welded pre-welded branch pipe (8) and the main pipe body (1). Open the valve (612) to discharge the detection gas, repair the joint, and then repeat the filling of the detection gas to check again whether there is a gap in the welding part.

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