Manufacturing method of water conveying pipeline closure section space elbow

Abstract

The invention relates to a large-diameter water conveying pipeline closure section manufacturing method, in particular to a water conveying pipeline closure section space elbow manufacturing method. The method comprises the following steps that firstly, an AB section and a CD section are installed pipeline sections, a folding pipe needs to be manufactured on a BC section for folding, and the pipeline is closed; 2, axis coordinates of the upstream and downstream installed pipes of the reserved closure section are measured on site through an instrument, the vertical pipe axes AB and CD intersect at the point O, and the horizontal pipe axes A1B1 and C1DC intersect at the point O1. Due to the implementation of the technical scheme, the plane angle and the vertical angle of the axis can be optimized and recombined into the space angle according to the actually measured axis position parameters of the closure section, prefabrication is completed in a factory, and field installation is convenient and fast. And 1-2 on-site closure welding seams can be reduced, the construction period is shortened by at least two days per section, and the construction cost is saved by at least 20,000 yuan per section by taking the caliber of DN3400 as an example.

Description

Technical Field

[0001] The present application relates to a method for closing a large-diameter water pipeline section, and in particular to a method for manufacturing a spatial elbow for a closed section of a water pipeline. Background Art

[0002] When installing large-diameter and long-distance water pipelines, in order to improve the progress of the project, multiple working surfaces are usually installed at the same time, and the pipeline working surface is closed by on-site welding of the closing pipe. Due to installation errors, the pipe axis at the closing point changes, and the production angle of the closing pipe does not match the original design angle, which is easy to produce a spatial angle, and even the intersection of the pipe axis on both sides is located in the installed pipeline, making it impossible to make the closing pipe according to the plane angle. To solve this problem, we propose a method for making the spatial elbow angle of the closing section, which is used for the production of angled closing pipes and pipeline closure. Summary of the invention

[0003] The purpose of the present application is to propose a method for manufacturing a spatial elbow for a water pipeline closing section, which can reduce the number of inflection points of the spatial elbow, is prefabricated in a factory, has high manufacturing accuracy, and is convenient for on-site assembly and welding during installation.

[0004] The present application is implemented as follows: a method for making a space elbow of a water pipeline closing section, which includes the following steps: step 1, the AB section and the CD section are installed pipeline sections, and a closing pipe needs to be made in the BC section to close the pipeline; step 2, the coordinates of the installed pipe axes upstream and downstream of the reserved closing section are measured on-site by an instrument, and the vertical pipe axes are AB and CD intersecting at point O, and the horizontal pipe axes are A1B1 and C1DC intersecting at point O1; step 3, in the closing section, Set straight lines L1 and L2 in BC, intersecting the axis at points E(E1) and F(F1) respectively, connecting EF(E1F1), the broken line BEFC is the vertical axis of the closed pipe, and the broken line B1E1F1C1 is the horizontal axis of the closed pipe; Step 4, ∠BEF is the vertical angle of point E, ∠B1E1F1 is the horizontal angle of point E1, point E coincides with point E1, that is, the coordinate positions are the same, and the spatial angle ∠1 at point E can be calculated using the functional relationship. Similarly, the spatial angle ∠2 at point F can be calculated; Step 5, according to the closing spatial position relationship, the spatial elbow is manufactured in the factory, with angles of ∠1 and ∠2 respectively; Step 6, the straight section BE and the straight section FC are used as the closing welding positions at the installation site, and the joints are welded on site.

[0005] Furthermore, after step six, the weld is polished and slag is removed after welding is completed, and the weld is anti-corrosion according to the anti-corrosion design requirements.

[0006] Due to the implementation of the above technical solution, this application can optimize and reorganize the plane and vertical angles of the axis into spatial angles according to the actual measured position parameters of the closing section axis, and complete prefabrication in the factory, which is convenient and quick to install on site. It can reduce 1~2 on-site closing welding seams, save at least 2 days / section of construction time, and save at least 20,000 yuan / section of construction costs, taking DN3400 as an example. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The specific structure of this application is given by the following drawings and embodiments: Figure 1 is a schematic structural diagram of a pipe axis of an embodiment of the present application; Figure 2 It is an angle schematic diagram of Example 1. DETAILED DESCRIPTION

[0008] The present application is not limited by the following embodiments, and the specific implementation method can be determined according to the technical solution of the present application and actual conditions.

[0009] like Figure 1 As shown, the method for manufacturing the space elbow of the water pipeline closing section includes the following steps: Step 1: The AB and CD sections are installed pipeline sections. A closing pipe needs to be made in the BC section to close the pipeline. Step 2: The coordinates of the installed pipe axes upstream and downstream of the reserved closing section are measured on site by instruments. The vertical pipe axes are AB and CD, which intersect at point O, and the horizontal pipe axes are A1B1 and C1DC, which intersect at point O1. Step 3: Straight lines L1 and L2 are set in the closing position BC, which intersect with the axes at points E (E1) and F (F1) respectively. EF (E1F1) is connected. The broken line BEFC is the vertical pipe axis of the closing pipe, and the broken line B1E1F1C1 is the horizontal pipe axis of the closing pipe. Step 4: ∠BEF is the vertical angle of point E, and ∠B1E1F1 is the horizontal angle of point E1. Point E coincides with point E1, that is, the coordinate positions are the same. The spatial angle ∠1 at point E can be calculated using the functional relationship. Similarly, the spatial angle ∠2 at point F can be calculated; Step 5, according to the spatial position relationship of closing, the spatial elbows are manufactured in the factory with angles of ∠1 and ∠2 respectively; Step 6, the straight sections BE and FC are used as the closing welding positions at the installation site, and are welded on site.

[0010] like Figure 1 As shown in the figure, according to the positions of the horizontal intersection and the vertical intersection of the pipe axis of the closed section measured on site, the plane intersection and the longitudinal intersection of the pipe axis are adjusted to the closed section, so that the two plane intersections and the two longitudinal intersections formed are located at two identical positions. The spatial angle of the same point of the pipe axis is obtained by this method, which is the manufacturing angle of the spatial elbow. This method can reduce the number of inflection points of the spatial elbow, complete prefabrication in the factory, have high manufacturing accuracy, and are convenient for on-site assembly and welding.

[0011] The spatial angle production method of the pipeline closing section can optimize and reorganize the plane and vertical angles of the axis into spatial angles according to the actual measured position parameters of the closing section axis, and complete the prefabrication in the factory, which is convenient and fast to install on site. It can reduce 1~2 on-site closing welding seams, save at least 2 days of construction time per section, and save at least 20,000 yuan of construction cost per section, taking DN3400 as an example.

[0012] Embodiment 1, as Figure 2 As shown, if the horizontal angle ∠B1E1F1=160° and the vertical angle ∠BEF=15° at the point E(E1) on the pipe axis, find the spatial angle ∠BEF1 of this point, that is, ∠1.

[0013] Assume that the projection of the spatial angle ∠1 on the horizontal plane is 1, that is, EF=E1F1=1, then in RT△BEF, BE=EF / COS(RADIAN(15))=1.035, BF=EF*TAN(RADIANS(15))=0.268; In △B1E1F1, using the cosine theorem, we can obtain: FF1=SQRT(EF*EF+E1F1*E1F1-2*EF*E1F1*COS(RADIANS(160)))=1.97; In RT△BFF1, BF1=SQRT(BF*BF+FF1*FF1)=1.988; In △BEF1, BE=1.035, E1F1=1, BF1=1.988, Using the cosine theorem, we can get the spatial angle ∠BEF1=∠1. That is, ∠1=DEGREES(ACOS(((BE*BE+E1F1*E1F1-BF1*BF1) / (2*BE*E1F1)))) =155.2; That is, the spatial angle and manufacturing angle at the intersection E of the pipe axis are 155.2°.

[0014] Similarly, based on the horizontal angle and vertical angle at the intersection F of the pipe axes, the spatial angle ∠2 at the intersection F of the pipe axes can be obtained.

[0015] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0016] The above technical features constitute the embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A method for manufacturing a space elbow for a water pipeline closing section, characterized in that The steps include: Step 1: AB and CD sections are installed pipeline sections, and a closing pipe needs to be made in BC section to close the pipeline; Step 2: Use instruments to measure the coordinates of the installed pipe axes upstream and downstream of the reserved closing section on site. The vertical pipe axes are AB and CD, which intersect at point O, and the horizontal pipe axes are A1B1 and C1DC, which intersect at point O1. Step 3: Set straight lines L1 and L2 in the closing position BC, intersecting the axis at points E (E1) and F (F1) respectively, connecting EF (E1F1), the broken line BEFC is the vertical axis of the closing pipe, and the broken line B1E1F1C1 is the horizontal axis of the closing pipe; Step 4, ∠BEF is the vertical angle of point E, ∠B1E1F1 is the horizontal angle of point E1, point E and point E1 coincide, that is, the coordinate positions are the same, and the spatial angle ∠1 at point E can be calculated using the functional relationship. Similarly, the spatial angle ∠2 at point F can be calculated; Step 5: According to the spatial position relationship of the closure, the spatial elbows are manufactured in the factory, with angles of ∠1 and ∠2 respectively; Step six, straight section BE and straight section FC are used as the welding positions for closing at the installation site, and are welded on site.

2. The method for manufacturing a space elbow for a water pipeline closing section according to claim 1 is characterized in that: After step six, the weld is polished and slag is removed after welding is completed, and the weld is anti-corrosion is performed according to the anti-corrosion design requirements.

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