CN110005883B

CN110005883B - Method for connecting gas pipeline without firing

Info

Publication number: CN110005883B
Application number: CN201910281523.0A
Authority: CN
Inventors: 雷洋
Original assignee: 雷洋
Current assignee: JIANGSU ZHONGDING TECHNOLOGY ENGINEERING Co.,Ltd.
Priority date: 2019-04-09
Filing date: 2019-04-09
Publication date: 2020-07-24
Anticipated expiration: 2039-04-09
Also published as: CN110005883A

Abstract

The invention discloses a gas pipeline fireless connecting method which comprises the steps of surveying and measuring, finished product processing and field installation. According to the connecting method of the gas pipeline without fire, the turning part is formed at one time by adopting the pipe bender, and an elbow pipe fitting is not needed to be used, so that the whole project is attractive; the pipelines are connected by adopting hydraulic pipe fittings to be formed in one step, the whole process is free of open fire operation, the risk of the installation process is reduced, and the installation is simple, convenient and quick.

Description

Method for connecting gas pipeline without firing

Technical Field

The invention belongs to the technical field of gas pipeline installation, and particularly relates to a connecting method for a gas pipeline without fire.

Background

In order to facilitate the use of natural gas by residents, the natural gas is required to be connected to each household through a pipeline. At present, a large number of elbow pipe fittings are used in gas installation engineering, namely the elbow pipe fittings are required to be installed at the bent positions of pipelines with paths needing to be changed, so that the overall attractiveness of the engineering is affected. When connecting the pipeline, a connecting point needs to be pressed twice, and the hydraulic chuck is too large. In the field installation process, pipeline connection cannot be implemented under the condition of insufficient space. In addition, when civil natural gas pipelines are installed indoors, the pipelines are generally connected in a ring pressing connection mode, a welding mode or a threaded connection mode. Aiming at the ring pressure connection mode, the defects that the stretch-resisting capability of a connection point is poor, a fuel gas introducing vertical pipe is easy to fall off when meeting ground settlement, a rubber pad in a pipe fitting is easy to age and the like exist, if a fire disaster occurs in a place, a pipeline in a fire passing area is ensured to leak, and therefore the reliability is poor. According to the standard requirement, nondestructive detection is carried out on welding points, urban pipeline installation is densely populated, people need to be evacuated when nondestructive detection is carried out on pipelines, and the detection time period is required to be at night, so that the coordination difficulty is high, open fire operation is adopted during construction, and the requirement on site fire prevention operation is high. If a silk mouth connection mode is adopted, after fire disaster occurs, leakage occurs at the connection part; the use of the threaded connection pipe fitting is more, the leakage is easy to occur, and the safety performance is poorer.

Disclosure of Invention

In view of the above, the present invention is directed to a method for connecting a gas pipe without firing.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention relates to a method for connecting a gas pipeline without firing, which comprises the following steps:

s1: surveying and measuring an installation site, and compiling a construction drawing by site measurement; to the compiled construction drawing

And (5) numbering, marking the position distribution of the pipe, the joint and the bearing point, and finishing the quantity statistics.

S2: processing finished products, processing pipe sections according to construction drawing numbers, adopting special-shaped areas at turning positions or paths

And (4) carrying out a cold machining pipe bending process on the hydraulic pipe bender.

S3: installing on site, transporting the finished product to the site, distributing and fixing the bearing support according to the construction drawing, and installing the finished product

The numbering and pipe arrangement are fixed, and the pipelines are connected through gas vertical pipes to be hydraulically connected, so that construction is completed.

Further, after the pipe bending process, performing appearance, thinning and pressure inspection on the processed finished product; and the finished products qualified in the inspection are protected externally, so that collision damage possibly occurring in the transportation process is prevented.

Further, in S3, the gas riser connecting pipe includes a pipe main body, a pair of caps fitted over the pipe main body; the pipe fitting main body comprises a main body part and matching parts arranged at two ends of the main body part, a limiting part is arranged on the outer wall of the joint of the matching parts and the main body part, sealing rings which protrude outwards relative to the inner wall are arranged on the inner wall of the matching parts along the circumferential direction, and protruding rings which protrude outwards are arranged on the outer wall of the matching parts relative to the sealing rings along the circumferential direction; the inner wall of the cover cap is in extrusion fit with the convex ring.

Further, the outer diameter of the main body part is larger than that of the matching part, and the surface of the outer wall of the main body part is a smooth cylindrical curved surface.

Further, the block includes extrusion portion and connecting portion, and the inner wall of extrusion portion is connected with the outer wall contact cooperation of cooperation portion, and the inner wall of connecting portion is connected with the outer wall contact cooperation of main part.

Furthermore, the limiting part is of a step-shaped structure, and a step-shaped structure matched with the limiting part is also arranged on the outer wall of the joint of the extrusion part and the connecting part.

Further, when the cap is mounted on the pipe body, the end faces of the connecting portions of the cap are in contact fit with each other.

Furthermore, a through hole penetrating through the main body part and the connecting part is formed in the side wall of the connecting pipe fitting.

Furthermore, the main body part is connected with a three-way branch pipe provided with a through hole corresponding to the through hole, and the outer end of the three-way branch pipe extends outwards after penetrating through the connecting part.

Further, a rubber sealing ring is arranged on the inner wall of the joint of the matching part and the main body part along the circumferential direction; and a sealing ring which protrudes outwards relative to the inner wall is also arranged on the inner wall of the matching part and is close to the outer end.

The invention has the beneficial effects that: according to the connecting method of the gas pipeline without fire, the turning part is formed at one time by adopting the pipe bender, and an elbow pipe fitting is not needed to be used, so that the whole project is attractive; the pipelines are connected by adopting hydraulic pipe fittings to be formed in one step, the whole process is free of open fire operation, the risk of the installation process is reduced, and the installation is simple, convenient and quick.

Drawings

In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:

fig. 1 is a schematic sectional view of a gas riser connecting pipe fitting structure in the method for connecting a gas pipeline without firing according to the present invention.

Fig. 2 is a schematic sectional view of another structure of a gas riser connecting pipe fitting in the method for connecting a gas pipeline without firing according to the present invention.

FIG. 3 is a schematic structural diagram of a tee branch pipe of a gas riser connecting pipe fitting in the method for connecting a gas pipeline without firing according to the present invention.

Fig. 4 is a schematic structural view of a tee branch pipe of a gas riser connecting pipe fitting in the method for connecting a gas pipeline without firing according to the present invention, the tee branch pipe being a bent pipe.

In the figure, 1 is a pipe main body, 2 is a cap, 10 is a main body part, 11 is a matching part, 12 is a limiting part, 110 is a sealing ring, 111 is a convex ring, 20 is an extrusion part, 21 is a connecting part, 22 is an inclined plane, 3 is a through hole, 4 is a three-way branch pipe, and 5 is a rubber sealing ring.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

The invention relates to a fire-free connecting method for a gas pipeline, which is used for gas installation engineering, such as the installation of resident indoor gas pipelines, and does not generate fire in the installation operation process. The method specifically comprises the following steps: s1: surveying and measuring an installation site, and compiling a construction drawing by site measurement; and numbering the compiled construction drawing, marking the position distribution of the pipe, the joint and the bearing point, and finishing the quantity statistics. The arrangement path of the pipeline, the number of two-way or three-way connecting pipe fittings required by pipeline connection and the positions and the number of the turning parts can be judged through the step, so that the next step of finished product processing can be carried out. S2: and (4) processing a finished product, namely processing a pipe section according to the serial number of a construction drawing, and performing a cold-processing pipe bending process on a turning position or an approach special-shaped area by adopting a hydraulic pipe bender. Namely, the part of the gas pipeline needing to turn is processed in advance in a special processing workshop through a hydraulic pipe bender to replace the traditional elbow pipe fitting. S3: and (3) field installation, namely transporting finished products to the field, distributing and fixing the bearing supports according to a construction drawing, distributing and fixing pipes according to finished product numbers, and hydraulically connecting the pipelines by adopting gas vertical pipes to connect pipe fittings to complete construction. The gas riser connecting pipe fitting is adopted to replace the traditional annular pressure connecting, welding or threaded connection mode, so that the pipe fitting can be connected and formed at one time, the whole process has no open fire operation, the risk in the installation process is reduced, and the installation is simple, convenient and quick.

In the embodiment, after the pipe bending process, appearance, thinning and pressure inspection are carried out on the processed finished product; and the finished products qualified in the inspection are protected externally, so that collision damage possibly occurring in the transportation process is prevented.

As shown in fig. 1, in S3, the gas riser connecting pipe includes a pipe body 1 made of a metal material, and a pair of caps 2 provided on the pipe body 1. The whole structure shape of pipe fitting main part 1, block 2 is the tubular structure, and during the use, block 2 suit is in the both sides of pipe fitting main part 1 respectively. The pipe fitting body 1 includes a main body 10 and fitting portions 11 provided at both ends of the main body 10, and the main body 10 and the fitting portions 11 are of an integral structure. The outer wall of the joint of the matching part 11 and the main body part 10 is provided with a limiting part 12, and when the cap 2 is sleeved on the pipe fitting main body 1, the limiting part 12 is used for limiting the axial displacement of the cap 2. A sealing ring 110 protruding outwards relative to the inner wall is arranged on the inner wall of the matching part 11 along the circumferential direction, a convex ring 111 protruding outwards is arranged on the outer wall of the matching part 11 relative to the sealing ring 110 along the circumferential direction, and the inner wall of the cap 2 is in extrusion fit with the convex ring 111.

The working principle of the gas riser connecting pipe fitting is that the cap 2 is preassembled on the pipe fitting main body 1, the end parts of two gas risers to be connected are respectively inserted into the pipe fitting main body 1 from two ends, and a special hydraulic clamp is used for applying pressure to enable the cap 2 to move from two ends to the middle part of the pipe fitting main body 1 along the axial direction so as to extrude the convex ring 111 from the radial direction, so that the sealing ring 110 is extruded and reduced and forms interference fit with a natural gas pipeline, namely, line sealing or surface sealing is realized, the purpose of connecting the natural gas pipeline is realized, the sealing effect can be achieved, and the natural gas leakage is prevented; the whole process is completed by one-time crimping, and the crimping tool is convenient and quick.

In the present embodiment, the outer diameter of the main body portion 10 is larger than the outer diameter of the engaging portion 11, and the outer wall surface of the main body portion 10 is a smooth cylindrical curved surface. To limit the axial position of the end of the natural gas pipe, the inner diameter of the main body portion 10 is smaller than the inner diameter of the fitting portion 11, that is, the inner wall of the main body portion 10 protrudes relative to the inner wall of the fitting portion 11, so that the inner diameter of the main body portion 10 is smaller than the outer diameter of the natural gas pipe, whereby the axial position of the natural gas pipe can be limited.

The cap 2 comprises a pressing part 20 and a connecting part 21, wherein the inner wall of the pressing part 20 is in contact fit connection with the outer wall of the matching part 11, and the inner wall of the connecting part 21 is in contact fit connection with the outer wall of the main body part 10. In the present embodiment, the diameter of the inner wall of the pressing portion 20 is equal to or slightly larger than the outer diameter of the matching portion 11, but the diameter of the inner wall of the pressing portion 20 is smaller than the outer diameter of the convex ring 111 on the matching portion 11, that is, the pressing portion 20 can be sleeved on the matching portion 11, and the pressing portion 20 can press the convex ring 111 under the external force, so that the matching portion 11 can form an interference fit with the natural gas pipeline to form a sealed connection. In the present embodiment, in order to make the squeezing operation smoother, the inner wall surface of the portion of the squeezing portion 20 close to the connection portion 21 is a slope 22 having a gradually increasing diameter from the outside to the inside.

In the present embodiment, the stopper portion 12 has a stepped structure, and a stepped structure that fits the stopper portion 12 is provided on the outer wall of the joint between the pressing portion 20 and the connecting portion 21.

When the caps 2 are arranged on the pipe fitting main body 1, the end faces of the connecting parts 21 of the caps 2 are in contact fit, namely, the outer surfaces of the two caps 2 integrally form a regular cylindrical structure, so that the appearance of the connecting pipe fitting at the connecting part is integrally attractive after the natural gas pipeline is connected.

As shown in fig. 2 to 4, as a further modification, a through hole 3 penetrating the main body portion 10 and the connection portion 21 is provided on a side wall of the connection pipe. Correspond through-hole 3 and connect tee bend branch pipe 4 that is equipped with through-hole 3 on main part 10, tee bend branch pipe 4's outer end passes connecting portion 21 and extends outward, can be connected through the welded mode between tee bend branch pipe 4 and the main part 10, can customize processing in advance at the mill during actual production to avoid the field installation to use the operation of starting a fire, also can integrative design between tee bend branch pipe 4 and the main part 10 of course. Therefore, the three-way connection of the resident users can also be formed in one step by adopting the hydraulic pipe connection, and the reliability is high. In the present embodiment, the three-way branch pipe 4 is a straight pipe, and in another embodiment, the three-way branch pipe 4 is a bent pipe.

In order to further guarantee the sealing effect, the rubber sealing ring 5 is arranged on the inner wall of the joint of the matching part 11 and the main body part 10 along the circumferential direction, and line sealing or surface sealing is formed between the connecting pipe fitting and the natural gas pipeline through the sealing ring 110, so that even if a fire disaster happens, the rubber sealing ring 5 is thermally deformed or melted, the sealing effect cannot be influenced, and leakage is caused. A sealing ring 110 protruding outward relative to the inner wall is also provided on the inner wall of the fitting portion 11 near the outer end, and the number of the sealing rings 110 may be one or more as required.

In the embodiment, the whole gas vertical pipe connecting pipe fitting is of a symmetrical structure; in other embodiments, the gas riser connecting pipe is asymmetric, for example, the members at the two ends of the gas riser connecting pipe are designed to have different sizes and shapes.

The gas riser connecting pipe fitting replaces ring pressure connection, welding or screw connection, has following advantage: 1. fire operation is not needed on site, and fire risk in the installation process is avoided. 2. The installation is swift, and every family only needs to use the pipe fitting to connect the back from top to bottom, and the cooperation uses special hydraulic tong once only to crimp, can accomplish to connect 20 seconds. 3. If a fire disaster happens, the front vertical pipe does not have a leakage condition.

According to the connecting method of the gas pipeline without fire, the turning part is formed at one time by adopting the pipe bender, and an elbow pipe fitting is not needed to be used, so that the whole project is attractive; the pipelines are connected by adopting hydraulic pipe fittings to be formed in one step, the whole process is free of open fire operation, the risk of the installation process is reduced, and the installation is simple, convenient and quick.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, when used in the orientation or positional relationship indicated in the figures, are used merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting. Furthermore, the appearances of the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

Claims

1. A method for connecting a gas pipeline without fire is characterized by comprising the following steps:

s1: surveying and measuring an installation site, and compiling a construction drawing by site measurement; numbering the compiled construction drawing, marking the position distribution of the pipe, the joint and the bearing point, and completing the quantity statistics;

s2: processing finished products, namely processing pipe sections according to construction drawing numbers, and performing cold-processing pipe bending process on a turning position or an approach special-shaped area by adopting a hydraulic pipe bender;

s3: the finished products are transported to the site, the bearing supports are distributed and fixed according to a construction drawing, the pipes are distributed and fixed according to finished product numbers, and the pipelines are connected hydraulically by adopting gas vertical pipe connecting pipes to complete construction;

in S3, the gas riser connecting pipe comprises a pipe body and a pair of caps sleeved on the pipe body; the pipe fitting main body comprises a main body part and matching parts arranged at two ends of the main body part, a limiting part is arranged on the outer wall of the joint of the matching parts and the main body part, a sealing ring which protrudes outwards relative to the inner wall is arranged on the inner wall of the matching parts along the circumferential direction, and a convex ring which protrudes outwards is arranged on the outer wall of the matching parts relative to the sealing ring along the circumferential direction; the inner wall of the cover cap is in extrusion fit with the convex ring.

2. The gas pipeline fireless connecting method according to claim 1, wherein after the pipe bending process, appearance, thinning and pressure inspection are performed on the processed finished product; and the finished products qualified in the inspection are protected externally, so that collision damage possibly occurring in the transportation process is prevented.

3. The method for firelessly connecting a gas pipe as recited in claim 1, wherein an outer diameter of the main body portion is larger than an outer diameter of the fitting portion, and an outer wall surface of the main body portion is a smooth cylindrical curved surface.

4. The method for connecting a gas pipeline without firing according to claim 3, wherein the cap includes a pressing portion and a connecting portion, an inner wall of the pressing portion is in contact fit connection with an outer wall of the fitting portion, and an inner wall of the connecting portion is in contact fit connection with an outer wall of the main body portion.

5. The method for connecting a gas pipeline without fire according to claim 4, wherein the limiting part is of a stepped structure, and a stepped structure matched with the limiting part is also arranged on the outer wall of the joint of the extrusion part and the connecting part.

6. The fireless connecting method for a gas pipe according to claim 5, wherein when the cap is mounted on the pipe main body, the end faces of the connecting portions of the cap are in contact engagement with each other.

7. A gas conduit fireless connecting method as claimed in any one of claims 4 to 6, wherein a through hole penetrating the main body portion and the connecting portion is provided in a side wall of the connecting pipe member.

8. The method for connecting a gas pipeline without firing according to claim 7, wherein a three-way branch pipe passing through the through hole is connected to the main body portion corresponding to the through hole, and an outer end of the three-way branch pipe extends outward after passing through the connecting portion.

9. The method for connecting a gas pipeline without firing according to claim 1, wherein a rubber seal ring is circumferentially provided on an inner wall of a junction of the fitting portion and the main body portion; and a sealing ring which protrudes outwards relative to the inner wall is also arranged on the inner wall of the matching part and is close to the outer end.