A crescent rib type steel bifurcated pipe piece structure manufacturing method
By using a segmented structure to manufacture crescent-ribbed steel branch pipes, the problems of high manufacturing difficulty and large steel consumption were solved, achieving precise and efficient production and reducing engineering costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- POWERCHINA HUADONG ENG CORP LTD
- Filing Date
- 2024-02-02
- Publication Date
- 2026-06-16
AI Technical Summary
The manufacturing process of crescent-ribbed steel branch pipes is difficult, the structure is complex, the amount of steel used is large, and the project investment is high.
The segmented structure manufacturing method is adopted. By determining the size and material of the steel branch pipe, it is divided into crescent-shaped reinforcing ribs and multiple tapered pipes. The steel plate is cut from the unfolded drawing and bent to form pipe sections. The accuracy is improved by using functional relationships. The steel pipe sections are welded together and then polished and surface treated.
It reduced the difficulty of manufacturing, reduced the amount of steel used, saved on project investment, and improved manufacturing accuracy and efficiency.
Smart Images
Figure CN118143578B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of pressure steel pipe technology for pumped storage power stations, and in particular to a method for manufacturing a crescent-ribbed steel branch pipe segment structure. Background Technology
[0002] Steel branch pipes are an important pipeline layout method in hydropower station water conveyance systems, specifically referring to a multi-unit layout with a single pipe. Specifically, internally reinforced crescent-ribbed steel branch pipes play a crucial role in this layout, offering advantages such as clear stress distribution, good flow characteristics, low head loss, and reliable structure. Therefore, they are widely used in large and medium-sized conventional and pumped-storage power stations both domestically and internationally. However, due to their large size and complex structure, the manufacturing process of crescent-ribbed steel branch pipes is quite challenging. The segmented structure and fabrication method of the steel branch pipe are key aspects of the manufacturing process, and a rational design of the segmented structure is of great significance for strengthening the production of crescent-ribbed steel branch pipes. Summary of the Invention
[0003] This application provides a method for manufacturing a crescent-ribbed steel branch pipe segment structure. This method not only reduces manufacturing difficulty and steel consumption, but also saves on project investment, making the manufacturing of steel branch pipes more precise and efficient.
[0004] The method for manufacturing the crescent-ribbed steel branch pipe segment structure provided in this application includes the following steps:
[0005] 1) Determine the dimensions of the steel branch pipe and the type of material used according to the structural requirements;
[0006] 2) Determine the shape drawing of the steel branch pipe, and divide the steel branch pipe into crescent-shaped reinforcing ribs and multiple tapered pipes according to the shape drawing;
[0007] 3) Develop each of the tapered tubes in stages according to the dimensional parameters and obtain its unfolded diagram;
[0008] 4) Cut the steel plate according to the size and shape of the unfolded drawing, and then bend the steel plate to form each pipe section;
[0009] 5) The calculation formula is derived by the functional relationship between the crescent-shaped reinforcing rib and the tapered tube, and the manufacturing accuracy of the crescent-shaped reinforcing rib is improved by calculating the position of each coordinate point;
[0010] 6) Weld each of the pipe sections to form a branch pipe section of the steel pipe, and weld the crescent-shaped reinforcing rib and the branch pipe section.
[0011] In addition, the manufacturing method provided in this application embodiment may also have the following additional technical features:
[0012] In one alternative embodiment, in step 2), the plurality of tapered pipes are divided into a main pipe transition section, a main tapered pipe section, a branch tapered pipe section, and a branch pipe transition section according to their different structures and positions, and the number of the branch tapered pipe section and the branch pipe transition section is two.
[0013] The main conical pipe section connects the main pipe transition section and the two branch conical pipe sections, with the two branch pipe transition sections located at the ends of the two branch conical pipe sections away from the main conical pipe section.
[0014] In one alternative approach, expanding the main transition section to obtain its expanded diagram includes the following steps:
[0015] When the main transition section is unfolded, since the radii of the two circular tubes before and after the main transition section are different, the side view of its unfolded diagram is a trapezoid. Extending the two sides of the unfolded main transition section and intersecting at a point O1 can be regarded as unfolding a cone with vertex O1, and its generatrix is the radius of the unfolded section.
[0016] A ring can be obtained with the element lines O1B1 and O1D1 as radii. The circumference of the ring is then calculated based on the radii A1B1 and C1D1. The obtained circumference lengths are then mapped onto the ring to obtain the unfolded diagram of the main transition section.
[0017] In one alternative approach, unfolding the tapered pipe section and obtaining its unfolded diagram includes the following steps:
[0018] Define the five vertices on the tapered pipe segment as A, B, C, D, and M. Rotate the tapered pipe segment to the horizontal plane of AB. Extend the two generatrices BC and AD to intersect the horizontal line passing through the point at points F and E. Extend the generatrices BC and AD in the opposite direction to intersect at point O.
[0019] Draw the bottom circle P of the top view based on the length of FE. Points F and E intersect circle P at points F' and E', respectively. Divide circle P into 36 equal parts. Take the points in the upper quadrant of circle P and mark them as multiple first marker points.
[0020] Project multiple first marker points of circle P onto line segment EF, and connect each projection point on EF to point O. The connecting line intersects with line segments CM and DM at multiple second marker points. Draw multiple horizontal lines from multiple second marker points to the corresponding side of line segments CE and DF. The multiple horizontal lines intersect with line segments CE and DF at multiple third marker points. Measure the distance between E' and the multiple third marker points.
[0021] Draw an arc JK with point O* as the center and the length of OE as the radius. The length of arc JK is equal to half the circumference of circle P. Divide arc JK into 18 equal parts. Connect O* to each of the division points on arc JK. Measure the lengths of multiple line segments on each connecting line so that the lengths of multiple line segments are equal to the distances between E' and multiple third marker points.
[0022] Connect the connecting lines of each length sequentially with spline curves and fit them. The resulting curve is the corresponding unfolded curve of the polyline CMD. Mirror the unfolded spline curve to obtain the unfolded diagram of the branch conical pipe section.
[0023] In one alternative approach, the method for unfolding the branch transition section and obtaining its unfolded diagram is the same as the method for obtaining the unfolded diagram of the main transition section.
[0024] And / or, the method for unfolding the main cone pipe section and obtaining its unfolded diagram is the same as the method for obtaining the unfolded diagram of the branch cone pipe section.
[0025] In an alternative embodiment, the manufacturing method further includes the following steps:
[0026] Polishing and finishing of the welded branch pipes are performed to improve surface quality and appearance;
[0027] Conduct quality inspections on the steel pipe branch pipes to ensure that the welding strength, dimensions, and shape meet the design requirements and standards;
[0028] Depending on the requirements, the branch pipe undergoes surface treatment, including anti-corrosion coating and spraying, to increase corrosion resistance and aesthetics.
[0029] The beneficial effects of the embodiments of this application are as follows:
[0030] The method for manufacturing crescent-ribbed steel branch pipe segmented structure provided in this application embodiment involves segmenting the steel branch pipe, obtaining the unfolded diagram of each segmented structure, and then laying out the segments on a steel plate according to the obtained unfolded diagram. This method makes the most of the steel plate material, reduces steel waste, lowers construction difficulty, reduces steel consumption, and saves on project investment.
[0031] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description
[0032] Figure 1 A geometrical drawing of the steel branch pipe provided in this application;
[0033] Figure 2 An expanded diagram of the main transition section provided for this application;
[0034] Figure 3 A schematic diagram illustrating the unfolding of the conical pipe section provided in this application;
[0035] Figure 4 An unfolded view of the tapered pipe section provided in this application;
[0036] Figure 5 An unfolded view of the main cone pipe section provided in this application;
[0037] Figure 6 An unfolded diagram of the branch transition section provided in this application;
[0038] Figure 7 This is a schematic diagram of the crescent-shaped reinforcing rib provided in this application.
[0039] Figure reference numerals: 1. Main pipe transition section, 2. Main tapered pipe section, 3. Branch tapered pipe section, 4. Branch pipe transition section, 5. Crescent-shaped reinforcing rib.
[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation
[0041] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0042] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.
[0043] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.
[0044] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0045] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.
[0046] like Figure 1-7 As shown in the figure, this application provides a method for manufacturing a crescent-ribbed steel branch pipe segmented structure. This method not only reduces manufacturing difficulty and steel consumption but also saves on project investment, making the manufacturing of steel branch pipes more precise and efficient. The manufacturing method includes the following steps:
[0047] 1) Determine the dimensions of the steel branch pipe and the type of material used, etc., according to the structural requirements of the steel branch pipe;
[0048] 2) After determining the dimensions, the shape drawing of the steel branch pipe is determined to facilitate the segmentation of the steel branch pipe. According to the shape drawing, the steel branch pipe is segmented into crescent-shaped reinforcing ribs 5 and multiple tapered pipes. Among them, according to different structures and positions, it is divided into main pipe transition section 1, main tapered pipe section 2, branch tapered pipe section 3, and branch pipe transition section 4. There are two branch tapered pipe sections 3 and two branch pipe transition sections 4. The main tapered pipe section 2 connects the main pipe transition section 1 and the two branch tapered pipe sections 3. The two branch pipe transition sections 4 are located at the ends of the two branch tapered pipe sections 3 away from the main tapered pipe section 2. This steel branch pipe has the characteristics of clear stress, good water flow pattern, small head loss, and reliable structure.
[0049] 3) Develop each tapered tube in stages according to the dimensional parameters and obtain its unfolded diagram;
[0050] 4) Cut the steel plate according to the size and shape of the unfolded drawing, and then bend the steel plate to form each pipe section;
[0051] 5) The calculation formula is derived by examining the functional relationship between the crescent-shaped reinforcing rib 5 and the tapered tube. A point is designated as the origin. Then, based on the coordinates of the intersection points corresponding to the unfolded diagram, the functional relationship between the rib plate dimensions and the basic parameters of the branch pipe is explored. By fitting the curves, the equations corresponding to the relevant curves can be obtained. These equations are then marked on the diagram, and the calculation formula is derived. Although the formula is relatively complex, after programming and computer testing, it is accurate and fast. Formula calculation can improve the accuracy of rib plate fabrication by controlling the coordinates of each point.
[0052] 6) Weld the various pipe sections to form the branch pipe section of the steel pipe, and weld the crescent-shaped reinforcing rib 5 and the branch pipe section.
[0053] The method for manufacturing crescent-ribbed steel branch pipe segmented structure provided in this application embodiment involves segmenting the steel branch pipe, obtaining the unfolded diagram of each segmented structure, and then laying out the segments on a steel plate according to the obtained unfolded diagram. This method makes the most of the steel plate material, reduces steel waste, lowers construction difficulty, reduces steel consumption, and saves on project investment.
[0054] like Figure 2 As shown, in one specific embodiment, expanding the main transition segment 1 and obtaining its expanded diagram includes the following steps:
[0055] Expand the main pipe transition section 1. Since the radii of the two circular pipes before and after the main pipe transition section 1 are different, the side view of its unfolded diagram is a trapezoid. Extend the two sides of the unfolded main pipe transition section 1 and intersect at a point O1. This can be regarded as unfolding a cone with vertex O1. Its generatrix is the radius of the unfolded section.
[0056] A ring can be obtained with the generatrix O1B1 and O1D1 as radii. The circumference of the ring is then calculated based on the radii A1B1 and C1D1. The obtained circumference lengths are then mapped onto the ring to obtain the unfolded diagram of the main transition section 1.
[0057] like Figure 3-4 As shown, in a specific embodiment, unfolding the conical pipe segment 3 and obtaining its unfolded diagram includes the following steps: defining the five vertices on the conical pipe segment 3 as A, B, C, D, and M respectively; rotating the conical pipe segment 3 to the horizontal of AB; extending the two side generatrices BC and AD to intersect the horizontal line passing through the point at points F and E; and extending the generatrices BC and AD in the opposite direction to intersect at point O.
[0058] Draw the bottom circle P in the top view based on the length of FE. Points F and E intersect circle P at points F' and E', respectively. Divide circle P into 36 equal parts. Take the points in the upper quadrant of circle P and mark them as multiple first marker points (marker point 0 (point E'), 1, 2, ..., 17, 18 (point F')).
[0059] Project multiple first marker points of circle P onto line segment EF, and connect each projected point on EF to point O. The connecting line intersects with line segments CM and DM at multiple second marker points (i.e., Figure 3 In the diagram, 0* (point C), 1*, 2*, ..., 7*, 18* (point D) are marked. Multiple horizontal lines are drawn from these second marks to the corresponding line segments CE and DF. These horizontal lines intersect line segments CE and DF at multiple third marks (0** (point C), 1**, 2**, ..., 18** (point D)). The distance from E' to these third marks is measured.
[0060] Draw an arc JK with point O* as the center and the length of OE as the radius. The length of arc JK is equal to half the circumference of circle P. Divide arc JK into 18 equal parts. Connect O* to each of the division points on arc JK. Measure the lengths of multiple line segments on each connecting line so that the lengths of multiple line segments are equal to the distances between E' and multiple third marker points.
[0061] Connect the connecting lines of each length sequentially with spline curves and fit them. The resulting curve is the corresponding unfolded curve of the polyline CMD. Mirror unfold the fitted spline curve to obtain the unfolded diagram of the conical pipe section 3.
[0062] like Figure 5-7 As shown, in one specific embodiment, the method for unfolding the branch transition section 4 and obtaining its unfolded diagram is the same as the method for obtaining the unfolded diagram of the main transition section 1; and / or, the method for unfolding the main conical pipe section 2 and obtaining its unfolded diagram is the same as the method for obtaining the unfolded diagram of the branch conical pipe section 3. Based on the above unfolding methods of the main transition section 1 and the branch conical pipe section 3, the unfolded diagrams of the main conical pipe section 2 and the branch transition section 4 can be obtained using the same method.
[0063] In addition, the manufacturing method also includes the following steps: 7) Polishing and finishing the welded branch pipe to improve surface quality and appearance;
[0064] 8) Conduct quality inspection of the steel pipe branch pipes to ensure that the welding strength, dimensions and shape meet the design requirements and standards;
[0065] 9) Depending on the requirements, the branch pipes are surface treated, including anti-corrosion coating and spraying, to increase corrosion resistance and aesthetics.
[0066] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A method for manufacturing a crescent-ribbed steel branch pipe segmented structure, characterized in that, Includes the following steps: 1) Determine the dimensions of the steel branch pipe and the type of material used according to the structural requirements; 2) Determine the shape drawing of the steel branch pipe, and divide the steel branch pipe into crescent-shaped reinforcing ribs and multiple tapered pipes according to the shape drawing; The multiple tapered pipes are divided into main pipe transition section, main tapered pipe section, branch tapered pipe section and branch pipe transition section according to their structure and position, and there are two branch tapered pipe sections and two branch pipe transition sections. The main conical pipe section connects the main pipe transition section and the two branch conical pipe sections, and the two branch pipe transition sections are respectively located at the ends of the two branch conical pipe sections away from the main conical pipe section; 3) Develop each of the tapered tubes in stages according to the dimensional parameters and obtain its unfolded diagram; Expanding the main transition section to obtain its expanded diagram includes the following steps: When the main transition section is unfolded, since the radii of the two circular tubes before and after the main transition section are different, the side view of its unfolded diagram is a trapezoid. Extending the two sides of the unfolded main transition section and intersecting at a point O1 can be regarded as unfolding a cone with vertex O1, and its generatrix is the radius of the unfolded section. A ring can be obtained with the generatrices O1B1 and O1D1 as radii respectively. The circumference of the inner ring is calculated from the radius A1B1 of the small end circle of the main transition section, and the circumference of the outer ring is calculated from the radius C1D1 of the large end circle of the main transition section. Then, the obtained circumference lengths are mapped onto the ring to obtain the unfolded diagram of the main transition section. 4) Cut the steel plate according to the size and shape of the unfolded drawing, and then bend the steel plate to form each pipe section; 5) The calculation formula is derived by the functional relationship between the crescent-shaped reinforcing rib and the tapered tube, and the manufacturing accuracy of the crescent-shaped reinforcing rib is improved by calculating the position of each coordinate point; 6) Weld each of the pipe sections to form a branch pipe section of the steel pipe, and weld the crescent-shaped reinforcing rib and the branch pipe section.
2. The method for manufacturing the crescent-ribbed steel branch pipe segment structure according to claim 1, characterized in that, The process of unfolding the tapered pipe section and obtaining its unfolded diagram includes the following steps: Define the five vertices on the tapered pipe segment as A, B, C, D, and M. Rotate the tapered pipe segment to the horizontal plane of AB. Extend the two generatrices BC and AD to intersect the horizontal line passing through the point at points F and E. Extend the generatrices BC and AD in the opposite direction to intersect at point O. Draw the bottom circle P of the top view based on the length of FE. Points F and E intersect circle P at points F' and E', respectively. Divide circle P into 36 equal parts. Take the points in the upper quadrant of circle P and mark them as multiple first marker points. Project multiple first marker points of circle P onto line segment EF, and connect each projection point on EF to point O. The connecting line intersects with line segments CM and DM at multiple second marker points. Draw multiple horizontal lines from multiple second marker points to the corresponding side of line segments CE and DF. The multiple horizontal lines intersect with line segments CE and DF at multiple third marker points. Measure the distance between E' and the multiple third marker points. Draw an arc JK with point O* as the center and the length of OE as the radius. The length of arc JK is equal to half the circumference of circle P. Divide arc JK into 18 equal parts. Connect O* to each of the division points on arc JK. Measure the lengths of multiple line segments on each connecting line so that the lengths of multiple line segments are equal to the distances between E' and multiple third marker points. Connect the connecting lines of each length sequentially with spline curves and fit them. The resulting curve is the corresponding unfolded curve of the polyline CMD. Mirror the unfolded spline curve to obtain the unfolded diagram of the branch conical pipe section.
3. The method for manufacturing the crescent-ribbed steel branch pipe segment structure according to claim 2, characterized in that, The method for unfolding the branch pipe transition section and obtaining its unfolded diagram is the same as the method for obtaining the unfolded diagram of the main pipe transition section; And / or, the method for unfolding the main cone pipe section and obtaining its unfolded diagram is the same as the method for obtaining the unfolded diagram of the branch cone pipe section.
4. The method for manufacturing the crescent-ribbed steel branch pipe segment structure according to any one of claims 1-3, characterized in that, It also includes the following steps: Polishing and finishing of the welded branch pipes are performed to improve surface quality and appearance; Conduct quality inspections on the steel pipe branch pipes to ensure that the welding strength, dimensions, and shape meet the design requirements and standards; Depending on the requirements, the branch pipe undergoes surface treatment, including anti-corrosion coating and spraying, to increase corrosion resistance and aesthetics.