Method for connecting and cutting a tilted pipe

Abstract

The application discloses a method for precisely aligning and cutting a fixed pipeline, which comprises the following steps: finding out the left and right end points A and B of the "to-be-cut end surface" of the fixed pipeline according to the left and right end points a and b of the end of a movable pipeline; finding out a point e on the movable pipeline which is in the same vertical direction with the top point c of the movable pipeline; finding out a contact point d between the end of the movable pipeline and the fixed pipeline; measuring the distance x between the point e and the contact point d; marking the position of the contact point d on the fixed pipeline; measuring x along the length direction of the fixed pipeline with the contact point d as the starting point to determine the top point C of the "to-be-cut end surface"; finding out a point E on the fixed pipeline which is in the same vertical direction with the top point C; and measuring x along the length direction of the fixed pipeline with the point E as the starting point to determine the low point D of the "to-be-cut end surface". The application realizes precise cutting and precise alignment of the pipeline by scientific means, and greatly improves the work efficiency.

Description

Technical Field

[0001] This invention relates to the field of pipe splicing and mating technology, and more specifically to a method for cutting and aligning inclined pipe splices. Background Technology

[0002] When connecting buried steel pipelines (new and old pipes), standard pipe fittings are usually used to connect the two fixed pipes. At this time, the fixed pipes need to be cut to remove the excess parts so that the standard pipe fitting can be inserted between the two pipes for alignment, so that the welding of the fitting and the pipe can be completed.

[0003] When cutting fixed pipes, the cutting dimensions must be precise; otherwise, the alignment of the pipes and fittings will be affected, making welding impossible. However, aligning large-diameter pipes is not easy, especially when the pipes are not horizontal. Relying solely on experience for cutting can easily lead to "cutting too much" or "cutting too little," resulting in rework and affecting work efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for cutting and aligning inclined pipe joints to ensure the accuracy of pipe cutting and alignment.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a method for cutting and aligning inclined pipe joints, comprising the following steps:

[0006] S1. Place the movable fitting above the fixed pipe and make it fit snugly against the fixed pipe;

[0007] S2. Based on the endpoints a and b of the left and right end faces of the movable pipe fitting, find the left and right endpoints A and B of the "end face to be cut" of the fixed pipe.

[0008] S3. Based on the vertex c of the movable pipe, find the point e on the movable pipe that is in the same vertical direction as vertex c;

[0009] S4. Locate the contact point d between the end of the movable pipe fitting and the fixed pipe, and measure the distance x between point e and contact point d;

[0010] S5. Mark the contact point d on the fixed pipe, and measure x along the length of the fixed pipe towards the location of point e, starting from the contact point d, to determine the vertex C of the "end face to be cut";

[0011] S6. Cut off part of the fixed pipe along the ACB trajectory;

[0012] S7. Based on the vertex C of the fixed pipe, find the point E where the fixed pipe and vertex C are in the same vertical direction;

[0013] S8. Starting from point E, measure x along the length of the fixed pipe toward the contact point d to determine the low point D of the "end face to be cut";

[0014] S9. Cut off the remaining part of the pipe along the ADB trajectory to achieve welding.

[0015] Furthermore, the specific process of obtaining the left and right endpoints A and B in S2 is as follows:

[0016] Place the plumb line on the left and right ends a and b of the movable pipe fitting, respectively. Move the movable pipe until the plumb line is tangent to the fixed pipe. At this point, the left and right ends A and B of the "end face to be cut" can be found.

[0017] Furthermore, the specific process of obtaining the midpoint e of S3 and the midpoint E of S7 is as follows:

[0018] Using a spirit level, place it above the movable or fixed pipe and locate the apex c of the pipe. Place the plumb line at apex c or apex C, meaning the plumb line is at point e or point E.

[0019] Furthermore, in S1, the movable pipe fitting is suspended and its position adjusted by a crane to fit against the fixed pipe.

[0020] The beneficial effects of this invention are reflected in:

[0021] The present invention provides a method for cutting and aligning inclined pipe joints. This method involves step-by-step measurement and cutting of the weld joint position using tools and fixed-point positioning. Scientific methods ensure the accuracy of pipe cutting, and the tools used are only a plumb bob and a spirit level, which are convenient and readily available. This method greatly improves work efficiency while ensuring cutting accuracy. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of step S2 of the present invention;

[0023] Figure 2 This is a schematic diagram of steps S3-S5 of the present invention;

[0024] Figure 3 This is a schematic diagram of steps S6-S8 of the present invention;

[0025] Figure 4 This is a schematic diagram of step S9 of the present invention;

[0026] Figure 5 This is a schematic diagram illustrating the operation of the welding joint method of the present invention. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] See Figure 1-5 .

[0029] The present invention provides a method for cutting and aligning inclined pipe joints, comprising the following steps:

[0030] S1. Place the movable fitting above the fixed pipe and make it fit snugly against the fixed pipe;

[0031] S2. Based on the endpoints a and b of the left and right end faces of the movable pipe fitting, find the left and right endpoints A and B of the "end face to be cut" of the fixed pipe.

[0032] S3. Based on the vertex c of the movable pipe, find the point e on the movable pipe that is in the same vertical direction as vertex c;

[0033] S4. Locate the contact point d between the end of the movable pipe fitting and the fixed pipe, and measure the distance x between point e and contact point d;

[0034] S5. Mark the contact point d on the fixed pipe, and measure x along the length of the fixed pipe towards the location of point e, starting from the contact point d, to determine the vertex C of the "end face to be cut";

[0035] S6. Cut off part of the fixed pipe along the ACB trajectory;

[0036] S7. Based on the vertex C of the fixed pipe, find the point E where the fixed pipe and vertex C are in the same vertical direction;

[0037] S8. Starting from point E, measure x along the length of the fixed pipe toward the contact point d to determine the low point D of the "end face to be cut";

[0038] S9. Cut off the remaining part of the pipe along the ADB trajectory to achieve welding.

[0039] In this embodiment, the specific process of obtaining the left and right endpoints A and B in S2 is as follows:

[0040] Place the plumb line on endpoints a and b of the left and right ends of the movable pipe fitting, respectively. Move the movable pipe until the plumb line is tangent to the fixed pipe. At this point, the left and right endpoints A and B of the "end face to be cut" can be identified. In this embodiment, the plumb line can be held manually by the operator without the need for other tools. This design makes the measuring tools readily available and the operation simple.

[0041] In this embodiment, the specific process of obtaining the midpoint e of S3 and the midpoint E of S7 is as follows:

[0042] Using a spirit level, place it above the movable pipe / fixed pipe to locate the apex c / vertex C of the pipe. Place the plumb line at apex c / vertex C, meaning the plumb line is at point e / point E. In this embodiment, when using a spirit level to find apex c, place the spirit level on top of the movable pipe and observe the bubble in the spirit level. When the bubble is in the middle, the tangent point between the spirit level and the movable pipe is the apex. This design makes the measuring tool readily available and the operation simple.

[0043] In this embodiment, the movable pipe fitting in S1 is suspended and positioned using a crane to align it with the fixed pipe. This design maintains the stability of the pipe assembly during alignment.

[0044] It should be noted that the steps of this invention apply to the connection between the inclined fixed pipe and the movable pipe fitting. When welding the pipe joints, it is necessary to cut both sides of the fixed pipe, meaning the process needs to be repeated twice. During both operations, see [reference needed]. Figure 5 The position of point e is located inside the active pipe fitting once and outside the active pipe fitting once.

[0045] It should also be noted that when the fixed pipe is placed horizontally, after reaching S2, it can be cut along AB. To ensure accurate cutting, the vertex C and the low point D can be further identified.

[0046] In summary, the method for cutting and aligning inclined pipe joints of the present invention uses tools and fixed-point positioning to measure and cut the welding joint position step by step. Scientific methods are used to ensure the accuracy of pipe cutting, and the tools used are only a plumb bob and a spirit level, which are convenient and readily available. This method greatly improves work efficiency while ensuring cutting accuracy.

[0047] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications or changes based on them. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

[0048] It should be noted that if the embodiments of the present invention involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0049] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

Claims

1. A method for cutting and aligning inclined pipe joints, characterized in that, Includes the following steps: S1. Place the movable fitting above the fixed pipe and make it fit snugly against the fixed pipe; S2. Based on the endpoints a and b of the left and right end faces of the movable pipe fitting, find the left and right endpoints A and B of the "end face to be cut" of the fixed pipe. S3. Based on the vertex c of the movable pipe, find the point e on the movable pipe that is in the same vertical direction as vertex c; S4. Locate the contact point d between the end of the movable pipe fitting and the fixed pipe, and measure the distance x between point e and contact point d; S5. Mark the contact point d on the fixed pipe, and measure x along the length of the fixed pipe towards the location of point e, starting from the contact point d, to determine the vertex C of the "end face to be cut"; S6. Cut off part of the fixed pipe along the ACB trajectory; S7. Based on the vertex C of the fixed pipe, find the point E where the fixed pipe and vertex C are in the same vertical direction; S8. Starting from point E, measure x along the length of the fixed pipe toward the contact point d to determine the low point D of the "end face to be cut"; S9. Cut off the remaining part of the pipe along the ADB trajectory to achieve welding.

2. The method for cutting and aligning inclined pipe joints according to claim 1, characterized in that, The specific process of obtaining the left and right endpoints A and B in S2 is as follows: Place the plumb line on the left and right ends a and b of the movable pipe fitting, respectively. Move the movable pipe until the plumb line is tangent to the fixed pipe. At this point, the left and right ends A and B of the "end face to be cut" can be found.

3. The method for cutting and aligning inclined pipe joints according to claim 1, characterized in that, The specific process of obtaining the midpoint e of S3 and the midpoint E of S7 is as follows: Using a spirit level, place it above the movable or fixed pipe and locate the apex c of the pipe. Place the plumb line at apex c or apex C, meaning the plumb line is at point e or point E.

4. The method for cutting and aligning inclined pipe joints according to claim 1, characterized in that, In S1, the movable pipe fitting is suspended and its position is adjusted by a crane to fit against the fixed pipe.

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