Inclined pipeline connecting, cutting and opening aligning method

Abstract

The invention discloses an inclined pipeline welding precise alignment method which comprises the following steps: finding out the left and right end points A and B of a to-be-cut end face of a fixed pipeline according to the end points a and b of the left and right end faces of the end part of a movable pipe fitting; according to the vertex c of the movable pipe fitting, a point e, located in the same vertical direction as the vertex c, on the movable pipe fitting is found out; finding out a contact point d between the end part of the movable pipe fitting and the fixed pipeline, and measuring a distance x between the point e and the contact point d; marking the position of a contact point d on the fixed pipeline, measuring x along the length direction of the fixed pipeline by taking the contact point d as a starting point, and determining a vertex C of a to-be-cut end face; according to the vertex C of the fixed pipeline, finding out a point E of the fixed pipeline in the same vertical direction as the vertex C; measuring x towards the direction of the contact point d along the length direction of the fixed pipeline by taking the point E as a starting point, and determining a low point D of the end face to be cut; by means of scientific means, precise pipeline cutting and precise opening alignment are achieved, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of pipe jointing and butting, in particular to a method for cutting and butting inclined pipe joints. Background Art

[0002] When buried steel pipelines are connected (new and old pipes are connected), standard pipe fittings are usually used to connect the two fixed new and old pipes. At this time, the fixed pipes need to be cut and the excess parts removed so that the standard pipe fittings can be embedded between the two pipes and matched to complete the welding of the pipe fittings and the pipeline.

[0003] When cutting fixed pipes, the cutting size must be relatively precise, otherwise it will affect the connection between the pipe and the pipe fittings and make welding impossible. However, it is not easy to connect large-diameter pipes, especially when the pipes are not horizontal. Cutting based on experience alone is prone to "overcutting" or "undercutting", 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 matching inclined pipe joints which can ensure the accuracy of pipe cutting and matching.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a method for connecting inclined pipes by cutting and matching, comprising the following steps:

[0006] S1. Place the movable pipe on top of the fixed pipe and fit it to the fixed pipe;

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

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

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

[0010] S5. Mark the position of contact point d on the fixed pipe, and measure x along the length direction of the fixed pipe toward the direction of point e from contact point d as the starting point 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. According to the vertex C of the fixed pipe, find the point E of the fixed pipe that is in the same vertical direction as the vertex C;

[0013] S8. Take point E as the starting point and measure x along the length of the fixed pipe toward the direction of the contact point d to determine the lowest 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:

[0016] Place the hanging line of the hanging hammer on the end points a and b of the left and right end surfaces of the end of the movable pipe respectively, move the position of the movable pipe until the hanging line is tangent to the fixed pipe, then you can find the left and right end points A and B of the "end surface to be cut".

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

[0018] Use a spirit level, place it above the movable pipe fitting\fixed pipe, find the vertex c\vertex C of the pipe fitting, and place the hanging line of the plumb bob at vertex c\vertex C, that is, the position of the plumb bob is point e\point E.

[0019] Furthermore, the movable pipe in S1 is suspended by a crane to adjust its position and make it fit with the fixed pipe.

[0020] The beneficial effects of the present invention are embodied in:

[0021] The method for cutting and connecting inclined pipes of the present invention performs step-by-step measurement and cutting of the welding joint positions through tools and fixed-point positioning, ensures the accuracy of pipe cutting through scientific means, and only uses a hanging hammer and a level ruler as tools, which are convenient and easy to obtain, greatly improving work efficiency while ensuring cutting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0026] Figure 5 It is a schematic diagram of the operation of the method for welding butt joints of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-5 .

[0029] The method for connecting and cutting inclined pipes of the present invention comprises the following steps:

[0030] S1. Place the movable pipe on top of the fixed pipe and fit it to the fixed pipe;

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

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

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

[0034] S5. Mark the position of contact point d on the fixed pipe, and measure x along the length direction of the fixed pipe toward the direction of point e from contact point d as the starting point 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. According to the vertex C of the fixed pipe, find the point E of the fixed pipe that is in the same vertical direction as the vertex C;

[0037] S8. Take point E as the starting point and measure x along the length of the fixed pipe toward the direction of the contact point d to determine the lowest 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:

[0040] The hanging line of the hanging hammer is placed on the end points a and b of the left and right end faces of the end of the movable pipe, and the movable pipe is moved until the hanging line is tangent to the fixed pipe. At this time, the left and right end points A and B of the "end face to be cut" can be found. In this embodiment, the hanging hammer can be manually held by the operator without the need to be used with other tools. With this design, the measuring tool is easy to obtain and simple to operate.

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

[0042] Use a level ruler, place it above the movable pipe\fixed pipe, find the pipe vertex c\vertex C, and place the hanging line of the plumb bob at vertex c\vertex C, that is, the plumb bob position is point e\point E. In this embodiment, when using a level ruler to find vertex c, place the level ruler on the top of the movable pipe, observe the bubble in the level ruler, and when it is in the middle, the tangent position of the level ruler and the movable pipe is the vertex. With this design, the measuring tool is easy to obtain and simple to operate.

[0043] In this embodiment, the movable pipe in S1 is suspended by a crane to adjust its position and make it fit with the fixed pipe. This design can maintain the stability of the pipe assembly during alignment.

[0044] It should be noted that the steps of the present invention are applicable to the connection between the inclined fixed pipe and the movable pipe fitting. When the pipes are welded together, both sides of the fixed pipe need to be cut. That is, the process of the present invention needs to be repeated twice. During the two operations, see Figure 5 , the position of point e is once inside the movable tube and once outside the movable tube;

[0045] It should also be noted that when the fixed pipe is placed horizontally, after reaching S2, it can be cut along AB. In order to ensure the accuracy of the cutting, the vertex C and the low point D can be further found.

[0046] In summary, the method for cutting and connecting inclined pipes of the present invention uses tools and fixed-point positioning to measure and cut the welding joint positions in steps, and uses scientific means to ensure the accuracy of pipe cutting. The tools only use a hanging hammer and a spirit level, which are convenient and easy to obtain. While ensuring the cutting accuracy, it greatly improves the work efficiency.

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

[0048] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A method for connecting and cutting inclined pipes, characterized in that: The following steps are involved: S1. Place the movable pipe on top of the fixed pipe and fit it to the fixed pipe; S2. According to the endpoints a and b of the left and right end faces of the end of the movable pipe, find the left and right endpoints A and B of the "end face to be cut" of the fixed pipe; S3. According to the vertex c of the movable tube, find the point e on the movable tube that is in the same vertical direction as the vertex c; S4. Find the contact point d between the end of the movable pipe and the fixed pipe, and measure the distance x between point e and the contact point d; S5. Mark the position of contact point d on the fixed pipe, and measure x along the length direction of the fixed pipe toward the direction of point e from contact point d as the starting point 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. According to the vertex C of the fixed pipe, find the point E of the fixed pipe that is in the same vertical direction as the vertex C; S8. Take point E as the starting point and measure x along the length of the fixed pipe toward the direction of the contact point d to determine the lowest 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 connecting and cutting inclined pipes according to claim 1, characterized in that: The specific process of obtaining the left and right endpoints A and B in S2 is: Place the hanging line of the hanging hammer on the end points a and b of the left and right end surfaces of the end of the movable pipe respectively, move the position of the movable pipe until the hanging line is tangent to the fixed pipe, then you can find the left and right end points A and B of the "end surface to be cut".

3. The method for connecting and cutting inclined pipes 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: Use a spirit level, place it above the movable pipe fitting\fixed pipe, find the vertex c\vertex C of the pipe fitting, and place the hanging line of the plumb bob at vertex c\vertex C, that is, the position of the plumb bob is point e\point E.

4. The method for connecting and cutting inclined pipes according to claim 1, characterized in that: The movable pipe in S1 is suspended by a crane to adjust its position and make it fit with the fixed pipe.

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