Quick coupling method for water supply pipeline

Abstract

The invention discloses a quick coupling method for a water supply pipeline. The quick coupling method comprises the steps that S1, a saddle-shaped water pipe connector is manufactured; s2, an original pipeline to be connected in the water supply pipeline is selected; s3, the saddle-shaped water pipe connector is horizontally and vertically welded to the outer wall of the original pipeline; s4, water supply is cut off, and pressure relief is conducted on the water supply pipeline after water supply is cut off; s5, forming a drain hole in the original pipeline, discharging the water of the water supply pipeline, and performing repair welding on the drain hole after the water is discharged; s6, the pipe wall, covered with the saddle-shaped water pipe connector, of the original pipeline is cut, and a water passing channel between the saddle-shaped water pipe connector and the original pipeline is obtained; s7, a valve is installed on the side, away from the original pipeline, of the saddle-shaped water pipe connector, and then the water supply pipeline connector is completed. Operation of welders can be reduced, the water cut-off operation time is shortened, the influence on water consumption of residents and enterprises within the range is reduced to the minimum, the construction procedure is simple, quality is good, and social and economic benefits are remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of municipal water supply engineering, and in particular to a quick connection method for a water supply pipeline. Background Art

[0002] In the relevant technology, currently, urban water supply pipelines use steel water supply pipes in places with large bends such as large undulations and underground obstacles, as well as river crossing sections. When adding joints to existing steel water supply pipelines, the welding method of cutting pipes and adding tees was used in the past. The water outage approval was handled and the construction was carried out after obtaining the consent of surrounding residents and enterprises.

[0003] In the related technology, the main procedures of the traditional method of adding joints are: first, shut off the water supply and relieve the pressure of the fire hydrant, open a hole to relieve the pressure, cut off the original pipeline and quickly drain the water in the pipe, trim and grind the steel tee and the original pipe weld, install and weld 2 welds of the tee, install the butterfly valve, apply 2 coats of anti-corrosion paint on the welds, check and restore the water supply, and the water outage operation time is about 7 hours.

[0004] This method is time-consuming because it requires processes such as cutting off the pipe and welding the steel tee. Summary of the invention

[0005] In order to solve the above problem, the present invention provides a quick connector method for a water supply pipe to solve the problem.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A quick connection method for a water supply pipe, comprising:

[0008] S1, making saddle-shaped water pipe joint;

[0009] S2, selecting the original pipeline to be connected in the water supply pipeline;

[0010] S3, weld the saddle-shaped water pipe joint horizontally and vertically to the outer wall of the original pipeline;

[0011] S4, stop the water supply and release the pressure of the water supply pipeline after the water supply is stopped;

[0012] S5, opening a drain hole on the original pipeline to drain the water from the water supply pipeline, and repair welding the drain hole after the water is drained;

[0013] S6, cutting the pipe wall of the original pipe covered by the saddle-shaped water pipe joint to obtain a water passage between the saddle-shaped water pipe joint and the original pipe;

[0014] S7, install the valve on the side of the saddle-shaped water pipe joint away from the original pipe to complete the water supply pipe joint.

[0015] Furthermore, in step S1, the steps of making the saddle-shaped water pipe joint include:

[0016] S11, select steel pipe and flange;

[0017] S13, after calibrating the steel pipe and the flange, double-sided welding is performed, and the valve is installed on the flange;

[0018] S14, performing arc cutting on the end of the steel pipe away from the flange to obtain a saddle-shaped water pipe joint; wherein the curvature of the arc end of the saddle-shaped water pipe joint is consistent with the curvature of the outer diameter of the original pipeline.

[0019] Furthermore, in step S13, the calibration step of the steel pipe and the flange includes:

[0020] S1031, use a square to calibrate the verticality of the flange to the pipe in two directions on the same side of the flange;

[0021] S1032, spot weld the flange to the pipe at 3-4 points;

[0022] S1033, conduct a secondary inspection to see if the flange plane is perpendicular to the center line of the steel pipe. If so, perform double-sided welding.

[0023] Furthermore, the welding steps of the double-sided welding are: base welding, layered welding, and cover welding.

[0024] Furthermore, after the double-sided welding is completed, the welding joints are sequentially processed as follows:

[0025] Step 1: grinding and trimming;

[0026] Step 2: Inspection;

[0027] Step three: anti-corrosion construction.

[0028] Furthermore, in step 2, the weld inspection step includes:

[0029] Install the flange blind plate to the flange of the saddle-shaped water pipe joint;

[0030] Inject water into the pipeline to pressurize it and stabilize the pressure for 30 minutes. The injection pressure is 1.0MPa.

[0031] Check whether the pipeline is leaking. If there is no leakage, stop injecting water and replenishing pressure. Stabilize for 15 minutes. If the pressure does not drop after 15 minutes or the value is within the design allowable range, check the pipeline to confirm that there is no leakage and it is considered qualified. If there is leakage, stop the pressure test in time and perform repair welding. After the repair welding is completed, re-pressurize until there is no leakage;

[0032] After completing the weld inspection, remove the flange blind plate to install the valve.

[0033] Furthermore, the welding step in step S3 includes:

[0034] S301, preliminarily fitting and docking the arc end of the saddle-shaped water pipe joint with the outer wall of the original pipe;

[0035] S302, fine grinding and trimming the saddle-shaped water pipe joint according to the docking deviation until the saddle-shaped water pipe joint is smoothly connected to the outer diameter of the original pipe;

[0036] S303, accurately aligning the saddle-shaped water pipe joint obtained after fine grinding and trimming in step S302 with the original pipeline and welding them.

[0037] Further, step S4, the pressure relief step includes:

[0038] S401, use fire hydrant water supply pipeline to relieve pressure;

[0039] S402, opening a pressure relief hole on the original pipeline for secondary pressure relief;

[0040] S403, after the pressure relief is completed, the pressure relief hole is repaired by welding.

[0041] Furthermore, in step S6, a 1 cm cut is made along the welding point between the saddle-shaped water pipe joint and the original pipe to ensure the water flow section.

[0042] Further, in step S13, the end of the steel pipe is inserted into the flange to a depth equal to the thickness of the flange.

[0043] Compared with the prior art, the beneficial technical effects of the present invention are:

[0044] When adding joints to the existing original steel water supply pipeline, a construction method of cutting the pipe and adding a tee is adopted. This method takes a long time because it requires cutting the pipe, welding the steel tee and other processes, generally taking about 8 hours. Urban water supply pipelines are like blood vessels in the human body, supplying thousands of households and enterprises and institutions. The longest water outage time does not exceed 4 hours. In order to reduce the impact of water outage construction on surrounding users, the present invention proposes a "saddle" type steel water supply pipeline quick connector and the original pipeline with water operation, which reduces welding operations, shortens the water outage operation time, and minimizes the impact on water use of residents and enterprises within the range. The construction process is simple, the quality is excellent, and the social and economic benefits are significant. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a schematic diagram of the process of the present invention;

[0047] Figure 2 Structural diagram of saddle-shaped water pipe joint;

[0048] Figure 3 Illustration of the installation position of the saddle-shaped water pipe joint;

[0049] Figure 4 This is a schematic diagram of the location of the water channel.

[0050] Illustration symbols: 1. saddle-shaped water pipe joint; 2. steel pipe; 3. flange; 4. original pipeline. DETAILED DESCRIPTION

[0051] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Example

[0055] Reference Figure 1-Figure 4 , a quick connector method for a water supply pipe disclosed in the present invention, comprising the following steps:

[0056] S1, making a saddle-shaped water pipe joint 1;

[0057] The specific production steps include: selecting a steel pipe 2 and a flange 3; the length of the steel pipe 2 is recommended to be greater than or equal to 0.6m to meet the requirements of subsequent cutting, grinding and valve installation, and the selection requirements of the steel pipe 2 should meet the following requirements: no damage, deformation, or corrosion on the appearance; the selection requirements of the flange 3 should meet the following requirements: the surface is smooth, and there should be no defects such as sand holes, cracks, spots, burrs, etc. that reduce the strength and connection reliability of the flange 3;

[0058] Insert the end of the steel pipe 2 vertically into the flange 3. The insertion depth is equal to the thickness of the flange 3. It is appropriate; then use a square to calibrate the verticality of flange 3 and the pipeline in two directions on the same side of flange 3. After completing the calibration, spot weld flange 3 and pipeline at 3-4 points, and then check whether the plane of flange 3 is perpendicular to the center line of steel pipe 2 for a second time. If it is vertical, double-sided welding is performed. Specifically, the weld on the inner side of flange 3 shall not protrude from the sealing surface of flange 3. When welding, a high current (280A) 3.2mm electrode is used for welding, layer by layer to form a fish scale shape, and three braids are fully welded;

[0059] Furthermore, the welding steps of double-sided welding are: base welding, layered welding, and cover welding.

[0060] After double-sided welding is completed, the weld joints are polished, inspected, and anti-corrosion treated in sequence. The weld joint inspection steps include:

[0061] Install the flange blind plate to the flange 3 of the saddle-shaped water pipe joint 1;

[0062] Inject water into the pipeline to pressurize it and stabilize the pressure for 30 minutes. The injection pressure is 1.0MPa.

[0063] Check whether the pipeline is leaking. If there is no leakage, stop injecting water and replenishing pressure. Stabilize for 15 minutes. If the pressure does not drop after 15 minutes or the drop value is within 0.05MPA, check the pipeline to confirm that there is no leakage and it is considered qualified. If there is leakage, stop the pressure test in time and repair welding. After the repair welding is completed, re-pressurize until there is no leakage;

[0064] After completing the weld inspection, the flange blind plate can be removed;

[0065] Then make an arc cut on the end of the steel pipe 2 away from the flange 3. When cutting, the curvature of the arc end of the saddle-shaped water pipe joint 1 should be kept consistent with the curvature of the outer diameter of the original pipeline 4. The specific operation is: use drawing software (such as CAD, etc.) to make the cutting size and arc according to the original pipeline size, mark the cutting size on the pipeline, and reserve about 1mm for flame cutting and welding shrinkage, planing edge, and grinding head removal when marking; after completing the marking and marking, use plasma arc cutting on the steel pipe 2. Before cutting, remove rust, oil and other impurities on the steel pipe 2, place the steel pipe 2 stably, select the nozzle aperture through trial cutting according to the material, type and thickness of the workpiece, adjust the cutting power, gas flow and electrode shrinkage, there should be no obvious scratches, burrs and sharp corners on the cutting surface, and the groove surface should be smooth and tidy. The cutting tolerance is: width 1.0mm.

[0066] S2, selecting the original pipe 4 to be connected in the water supply pipe;

[0067] S3, welding the saddle-shaped water pipe joint 1 horizontally and vertically to the outer wall of the original pipeline 4;

[0068] The specific steps include:

[0069] Before welding, first grind the saddle-shaped water pipe joint 1 and the original pipe preliminarily. Specifically, when grinding the saddle-shaped water pipe joint 1, use a manual grinder to grind the arc-shaped end of the steel pipe 2 away from the flange 3, grind it into a groove, and clean and flatten the surface and groove of the saddle-shaped water pipe joint 1. Furthermore, the slope foot of the groove should be controlled at 60° to improve the fullness of subsequent welding;

[0070] After finishing, the arc end of the saddle-shaped water pipe joint 1 is initially fitted and docked with the outer wall of the original pipe;

[0071] According to the docking deviation, the saddle-shaped water pipe joint 1 is finely ground and trimmed until the saddle-shaped water pipe joint 1 is smoothly connected to the outer diameter of the original pipe 4, and then accurately aligned with the original pipe 4 and welded.

[0072] After welding is completed, the weld is polished.

[0073] S4, cut off the water supply, and after the water supply is cut off, the water supply pipeline is depressurized for the first time through the fire hydrant. After the first pressure relief is completed, a pressure relief hole is opened on the original pipeline 4 for secondary pressure relief; after the pressure relief is completed, the pressure relief hole is repaired by welding.

[0074] S5, a drain hole is opened on the original pipeline 4, and the drain hole is opened at the bottom to drain the water from the water supply pipeline. The remaining water can be pumped out by a water pump. After the water is drained, the drain hole is repaired and welded to avoid water leakage during water supply.

[0075] S6, cut the pipe wall of the original pipe 4 covered by the saddle-shaped water pipe joint 1 to obtain a water passage between the saddle-shaped water pipe joint 1 and the original pipe 4. Specifically, when cutting, it is necessary to cut along 1 cm of the welding point between the saddle-shaped water pipe joint 1 and the original pipe 4 to ensure the water flow section.

[0076] S7, installing a valve on the side of the saddle-shaped water pipe joint 1 away from the original pipeline 4, thus completing the joint of the water supply pipeline.

[0077] In this embodiment, the steel pipe 2 is made of Q235-B carbon steel, and its dimensions are as shown in the series 2 requirements in the standard atlas of "Steel Pipe Fittings" (02S403). The welding rod is 43XX type, and the anti-corrosion is the extra-reinforced anti-corrosion of epoxy coating in drinking water containers, with a thickness of not less than 0.45mm.

[0078] The working principle and beneficial effects of the present invention are:

[0079] In the present invention, steps S1, S2, S3, S7 and other processes can be completed before the water outage operation. Compared with the two welds in the traditional welding of the tee, the present invention reduces one weld in the process, and the water outage operation time is reduced by 3.3 hours compared with the traditional method, which minimizes the impact of water outage and provides a guarantee for the life of surrounding residents and the continuous production of enterprises. According to actual calculations, the water outage time can be saved by 49.3%.

[0080] Therefore, the present invention has the characteristics of fast construction speed, reduced welding operations, shortened water outage operation time, minimizing the impact on water use of residents and enterprises within the range, reliable quality, and significant economic benefits. The construction method reaches the domestic leading level.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A quick connector method for a water supply pipe, characterized in that: include: S1, making a saddle-shaped water pipe joint (1); S2, selecting the original pipeline (4) to be connected in the water supply pipeline; S3, welding the saddle-shaped water pipe joint (1) horizontally and vertically to the outer wall of the original pipe (4); S4, stop the water supply and release the pressure of the water supply pipeline after the water supply is stopped; S5, opening a drain hole on the original pipeline (4) to drain the water from the water supply pipeline, and repair welding the drain hole after the water is drained; S6, cutting the pipe wall of the original pipe (4) covered by the saddle-shaped water pipe joint (1) to obtain a water passage between the saddle-shaped water pipe joint (1) and the original pipe (4).

2. A quick connector method for a water supply pipe according to claim 1, characterized in that: In step S1, the steps of manufacturing the saddle-shaped water pipe joint (1) include: S11, selecting a steel pipe (2) and a flange (3), and inserting an end of the steel pipe (2) into the flange (3); S13, after the positions of the steel pipe (2) and the flange (3) are corrected, double-sided welding is performed, and the valve is installed on the flange (3); S14, performing arc cutting on the end of the steel pipe (2) away from the flange (3) to obtain a saddle-shaped water pipe joint (1); wherein the curvature of the arc-shaped end of the saddle-shaped water pipe joint (1) is consistent with the curvature of the outer diameter of the original pipeline (4).

3. A quick connector method for a water supply pipe according to claim 2, characterized in that: In step S13, the calibration steps of the steel pipe (2) and the flange (3) include: S1031, use a square to calibrate the verticality of the flange (3) with respect to the pipe in two directions on the same side of the flange (3); S1032, spot weld the flange (3) to the pipe at 3-4 points; S1033, check again whether the plane of the flange (3) is perpendicular to the center line of the steel pipe (2). If so, perform double-sided welding.

4. A quick connector method for a water supply pipe according to claim 3, characterized in that: The welding steps of the double-sided welding are: base welding, layered welding, and cover welding.

5. A quick connector method for a water supply pipe according to claim 4, characterized in that: After double-sided welding is completed, the welding joints are carried out in sequence: Step 1: grinding and trimming; Step 2: Inspection; Step three: anti-corrosion construction.

6. A quick connector method for a water supply pipe according to claim 5, characterized in that: In step 2, the inspection steps of the weld joint include: Install the blind flange plate to the flange plate (3) of the saddle-shaped water pipe joint (1); Inject water into the pipeline to pressurize it and stabilize the pressure for 30 minutes. The injection pressure is 1.0MPa. Check whether the pipeline is leaking. If there is no leakage, stop injecting water and replenishing pressure. Stabilize for 15 minutes. If the pressure does not drop after 15 minutes or the value is within the design allowable range, check the pipeline to confirm that there is no leakage and it is considered qualified. If there is leakage, stop the pressure test in time and perform repair welding. After the repair welding is completed, re-pressurize until there is no leakage; After completing the weld inspection, remove the flange blind plate to install the valve.

7. A quick connector method for a water supply pipe according to claim 1, characterized in that: The welding step in step S3 includes: S301, preliminarily fitting and docking the arc-shaped end of the saddle-shaped water pipe joint (1) with the outer wall of the original pipe; S302, fine grinding and trimming the saddle-shaped water pipe joint (1) according to the docking deviation until the saddle-shaped water pipe joint (1) is smoothly connected to the outer diameter of the original pipe (4); S303, accurately aligning the saddle-shaped water pipe joint (1) obtained after fine grinding and trimming in step S302 with the original pipeline (4) and welding them.

8. A quick connector method for a water supply pipe according to claim 1, characterized in that: Step S4, the pressure relief step comprises: S401, use fire hydrant water supply pipeline to relieve pressure; S402, opening a pressure relief hole on the original pipeline (4) for secondary pressure relief; S403, after the pressure relief is completed, the pressure relief hole is repaired by welding.

9. A quick connector method for a water supply pipe according to claim 1, characterized in that: In step S6, a 1 cm cut is made along the welding point between the saddle-shaped water pipe joint (1) and the original pipe (4) to ensure the water flow section.

10. A quick connector method for a water supply pipe according to claim 2, characterized in that: In step S13, the port insertion depth of the steel pipe (2) is equal to the thickness of the flange (3).

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