Method for laying heating pipe at corner

Abstract

The application relates to a laying method for a heating pipeline corner, which comprises the following steps: calculating the allowed bending radius of a first pipeline section according to the elastic modulus of the first pipeline section, the outer diameter of the pipeline section and the allowed stress during bending; calculating the maximum allowed corner of the first pipeline section according to the allowed bending radius of the first pipeline section and the arc length of the bent pipeline section; and if the actual corner in construction is smaller than the maximum allowed corner of the first pipeline section, the first pipeline section is bent to form a bent pipeline section by using the elastic bending laying mode to carry out laying. The pipeline laying at the corner is carried out by adopting the mode of bending the first pipeline section to form a bent pipeline section, the number of elbows is reduced, the engineering cost is reduced, the engineering accident occurrence is reduced due to the reduction of joints, and the application has the advantages of economy and safety.

Description

Technical Field

[0001] This invention belongs to the field of heating pipeline laying technology, specifically relating to a method for laying heating pipelines at corners. Background Technology

[0002] Currently, most heating insulation pipes used in China are laid underground using a non-compensated cold installation method.

[0003] In actual heating projects, during the initial pipeline routing design, many bends are inevitable due to various factors, such as the need to accommodate different terrain undulations, the required burial depth of the pipe top, the requirement for a 2‰ slope for the heating pipeline, and the need for the pipeline layout to meet the minimum distance requirements between underground heating pipelines and buildings or other pipelines. Due to pipeline stress and regulatory limitations, most bends require special handling measures.

[0004] There are several common methods for handling pipe bends: First, replacing smaller bends with smaller ones connected in series; second, limiting the length of the arms on both sides of the bend, such as by adding compensators / fixed supports, to restrict the transfer of thermal expansion from both sides of the pipe to the bend; third, using L-shaped or U-shaped bends to absorb thermal displacement, and replacing the bend or two bends with large-radius bends. However, each of these methods has its own problems: for example, the first method increases the number of welds, requires high construction precision, and demands high on-site construction quality, and is not suitable for large-diameter pipes with large temperature differences; the second method uses compensators, leading to a higher accident rate and increased investment costs; the third method requires sufficient space for pipe layout, resulting in deeper pipe installations, which is more restrictive in urban areas with limited construction space.

[0005] Therefore, a reasonable and advanced method for laying heating pipelines is an important factor in ensuring the safety and economy of heating pipeline network projects. Summary of the Invention

[0006] To address all or some of the aforementioned problems, the present invention aims to provide a method for laying heating pipelines at corners. By bending the first pipe section to form a curved pipe section, the method reduces the number of elbows used, lowers the risk of accidents, and ensures the safety and economy of construction.

[0007] According to one aspect of the present invention, a method for laying heating pipes at bends is provided, comprising:

[0008] Based on the elastic modulus of the first pipe section, the outer diameter of the pipe section, and the allowable stress during bending, the allowable bending radius of the first pipe section is calculated.

[0009] The maximum allowable turning angle of the first pipe segment is calculated based on the allowable bending radius of the first pipe segment and the arc length of the bent pipe segment;

[0010] If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe section, then the first pipe section is bent into a curved pipe section for laying by means of elastic bending.

[0011] Furthermore, the calculation of the allowable bending radius of the first pipe segment based on its elastic modulus, outer diameter, and allowable stress during bending is specifically as follows:

[0012] Based on the elastic modulus of the first pipe segment, the outer diameter of the pipe segment, and the allowable stress during bending, the allowable bending radius of the first pipe segment is calculated. The allowable bending radius of the first pipe segment is equal to the product of the elastic modulus of the first pipe segment and the outer diameter of the first pipe segment, divided by twice the allowable stress during bending.

[0013] Furthermore, before laying the first pipe segment by bending it into a curved pipe segment using an elastic bending method if the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment, the method further includes:

[0014] Excavate the trenches corresponding to the curved pipe sections and the straight pipe sections at both ends of the curved pipe sections according to the drawings.

[0015] Furthermore, if the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment, then using an elastic bending laying method to bend the first pipe segment into a bent pipe segment for laying further includes:

[0016] If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe section, then lay the straight pipe sections at both ends of the curved pipe section according to the drawings;

[0017] Connect one end of the first pipe segment to one of the straight pipe segments;

[0018] An external force is applied to bend the first pipe segment into a curved pipe segment that meets the requirements of the drawing, and the other end of the first pipe segment is connected to another straight pipe segment;

[0019] Remove external forces and complete the laying of the curved pipe section.

[0020] Furthermore, the external force applied to bend the first pipe segment to the radius of curvature required by the drawing is applied manually or by machine.

[0021] Furthermore, the removal of external force to complete the laying of the curved pipe section specifically involves:

[0022] Remove the external force and check whether the bending condition of the bent pipe section is consistent with the drawing. If it is consistent, the laying of the bent pipe section is complete.

[0023] Furthermore, the connection between one end of the first pipe segment and one of the straight pipe segments specifically refers to:

[0024] Adjust the first pipe segment so that its axis coincides with that of the straight pipe segment, and connect one end of the first pipe segment to one of the straight pipe segments.

[0025] Furthermore, the specific steps of applying external force to bend the first pipe segment to a curved pipe segment conforming to the drawing requirements, and connecting the other end of the first pipe segment to another straight pipe segment, are as follows:

[0026] Apply external force to bend the first pipe section to a bend that meets the requirements of the drawing, adjust the pipe opening of the first pipe section to make it concentric with the corresponding straight pipe section, and connect the other end of the first pipe section to another straight pipe section.

[0027] Furthermore, the connection between one end of the first pipe segment and one of the straight pipe segments specifically refers to:

[0028] Weld one end of the first pipe section to one of the straight pipe sections.

[0029] Furthermore, the specific steps of applying external force to bend the first pipe segment to a curved pipe segment conforming to the drawing requirements, and connecting the other end of the first pipe segment to another straight pipe segment, are as follows:

[0030] An external force is applied to bend the first pipe section into a curved section that meets the requirements of the drawing, and the other end of the first pipe section is welded to another straight pipe section.

[0031] As can be seen from the above technical solution, the method for laying heating pipes at corners provided by the present invention has the following beneficial effects:

[0032] This invention uses a method of bending the first pipe section to form a curved pipe section for pipe laying at corners, which reduces the number of elbows used and reduces project costs. In addition, because it reduces joints, it reduces the occurrence of engineering accidents, and has the advantages of economy and safety. Attached Figure Description

[0033] Figure 1 This is a flowchart illustrating a method for laying heating pipes at a bend according to an embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram showing the relative positions of the curved pipe section and the straight pipe section in an embodiment of the present invention. Detailed Implementation

[0035] To better understand the purpose, structure, and function of this invention, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a method for laying heating pipes at corners.

[0036] like Figure 1 As shown, this invention illustrates a method for laying heating pipes at corners, comprising the following steps:

[0037] Step S110: Calculate the allowable bending radius of the first pipe segment based on its elastic modulus, outer diameter, and allowable stress during bending.

[0038] Step S120: Calculate the maximum allowable turning angle of the first pipe segment based on the allowable bending radius of the first pipe segment and the arc length of the bent pipe segment;

[0039] Step S130: If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment, the first pipe segment is bent into a curved pipe segment for laying by means of elastic bending.

[0040] In this embodiment, for the first pipe segment, the allowable bending radius of the first pipe segment can be calculated based on its elastic modulus, outer diameter, and allowable stress during bending. This allowable bending radius is the minimum radius of the arc that the straight pipe corresponding to the first pipe segment can be bent into when the first pipe segment is bent. Based on the calculated allowable bending radius and the actual arc length of the bent pipe segment, the maximum allowable turning angle of the first pipe segment can be calculated accordingly. Therefore, a suitable laying method for the heating pipeline at the turning point can be selected based on the maximum allowable turning angle of the first pipe segment. Specifically, when the actual turning angle between the two straight pipe segments at both ends of the bent pipe segment is less than the maximum allowable turning angle, an elastic bending laying method can be adopted to bend the first pipe segment into a bent pipe segment, thereby using the bent pipe segment formed by bending the straight pipe segment to replace the existing method of laying using elbows.

[0041] In step S110, the calculation of the allowable bending radius of the first pipe segment based on its elastic modulus, outer diameter, and allowable stress during bending is specifically as follows:

[0042] Based on the elastic modulus E of the first pipe segment (in megapascals, MPa), the outer diameter D0 of the pipe segment (in meters, m), and the allowable stress σ during bending (in megapascals, MPa), the allowable bending radius R of the first pipe segment is calculated. The allowable bending radius R of the first pipe segment is equal to the product of the elastic modulus E and the outer diameter D0 of the first pipe segment, divided by twice the allowable stress σ during bending. That is:

[0043]

[0044] In step S120, the maximum allowable turning angle of the first pipe segment needs to be calculated based on the allowable bending radius of the first pipe segment and the arc length of the bent pipe segment. Specifically:

[0045] like Figure 2 As shown, the arc length between AE represents the arc length of the bent pipe segment, the included angle α between the two straight pipe segments represents the maximum allowable turning angle of the first pipe segment, the intersection of the perpendiculars of the two straight pipe segments is the center B of the bent pipe segment, and the length of AB or BE represents the allowable bending radius of the first pipe segment. Therefore:

[0046] The size of angle ABE can be calculated based on the arc length and the allowable bending radius of the first pipe section. The size of angle CBE can be calculated based on the size of angle ABE, and then the size of angle BCE can be calculated. Finally, the size of the maximum allowable turning angle α can be obtained.

[0047] Therefore, the maximum allowable turning angle of the first pipe section is calculated based on the allowable bending radius of the first pipe section and the arc length of the bent pipe section, where the arc length of the bent pipe section is obtained from the design drawings.

[0048] In step S130, if the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment, before laying the first pipe segment by bending it into a curved pipe segment using an elastic bending method, the laying method at the turning point of the heating pipeline in this embodiment of the invention further includes:

[0049] Excavate the trenches corresponding to the curved pipe sections and the straight pipe sections at both ends of the curved pipe sections according to the drawings.

[0050] In this embodiment, the pipe trench includes a trench for straight pipe sections and a trench for curved pipe sections between the straight pipe sections. The excavated trench facilitates the placement of straight pipe sections in the trench and also facilitates the placement of curved pipe sections after the first pipe section has been bent in the trench, thereby realizing the connection between the straight pipe sections and the curved pipe sections.

[0051] In step S130, the step of bending the first pipe segment into a curved pipe segment by means of elastic bending laying if the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment further includes:

[0052] If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe section, then lay the straight pipe sections at both ends of the curved pipe section according to the drawings;

[0053] Connect one end of the first pipe segment to one of the straight pipe segments;

[0054] An external force is applied to bend the first pipe segment into a curved pipe segment that meets the requirements of the drawing, and the other end of the first pipe segment is connected to another straight pipe segment;

[0055] Remove external forces and complete the laying of the curved pipe section.

[0056] Specifically, determine the start and end points of the curved pipe section in the pipe trench, and then lay the straight pipe sections at both ends of the curved pipe section according to the start and end points. After the two straight pipe sections are laid, connect one of the straight pipe sections to one end of the first pipe section, and then apply external force to bend the first pipe section into a curved pipe section. Finally, connect the other straight pipe section to the other end of the curved pipe section.

[0057] Secondly, when laying two straight pipe sections, it is necessary to ensure that the included angle between the axes of the two straight pipe sections is equal to the actual turning angle during the laying process. At the same time, it is also necessary to reserve the bending length of the pre-calculated curved pipe section between the two straight pipe sections to ensure that the straight pipe section and the curved pipe section after the first pipe section bend can be successfully connected.

[0058] In the step of applying external force to bend the first pipe segment to the radius of curvature required by the drawing, the external force is applied manually or by machine. The specific method of applying the external force manually or by machine depends on the angle at which the first pipe segment needs to be bent. If the angle is small, the external force can be applied manually; otherwise, it is applied by machine.

[0059] Specifically, the step of removing external force to complete the laying of the bent pipe section is as follows:

[0060] Remove the external force and check whether the bending condition of the bent pipe section is consistent with the drawing. If it is consistent, the laying of the bent pipe section is complete.

[0061] Specifically, when connecting one end of the first pipe segment to one of the straight pipe segments, the first pipe segment needs to be adjusted so that its axis coincides with that of the straight pipe segment before connecting one end of the first pipe segment to one of the straight pipe segments. The connection between the straight pipe segment and one end of the first pipe segment is a fixed connection method such as welding.

[0062] Specifically, applying external force to bend the first pipe segment into a curved pipe segment that meets the requirements of the drawing, and connecting the other end of the first pipe segment to another straight pipe segment, involves:

[0063] Apply external force to bend the first pipe section to a bend that meets the requirements of the drawing, adjust the pipe opening of the first pipe section to make it concentric with the corresponding straight pipe section, and connect the other end of the first pipe section to another straight pipe section.

[0064] Secondly, the connection between the other end of the first pipe segment and the other straight pipe segment is specifically a fixed connection method such as welding.

[0065] In addition, this embodiment of the invention is applied to situations where the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment. In such cases, the curved pipe segment can be laid by bending the first pipe segment into a curved pipe segment and connecting the curved pipe segment to the straight pipe segments at both ends.

[0066] If the actual turning angle during construction is greater than the maximum allowable turning angle of the first pipe section, the actual turning angle can be divided into several smaller turning angles, each smaller than the maximum allowable turning angle of the first pipe section, according to the actual situation at the construction site. Each smaller turning angle segment is laid by bending the first pipe section into a curved pipe section using an elastic bending laying method.

[0067] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0068] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0069] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions 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, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for laying heating pipes at corners, characterized in that, include: Based on the elastic modulus of the first pipe section, the outer diameter of the pipe section, and the allowable stress during bending, the allowable bending radius of the first pipe section is calculated. The maximum allowable turning angle of the first pipe segment is calculated based on the allowable bending radius of the first pipe segment and the arc length of the bent pipe segment; If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe section, then the first pipe section is bent into a curved pipe section for laying by means of elastic bending.

2. The method for laying heating pipelines at corners according to claim 1, characterized in that, The allowable bending radius of the first pipe segment is calculated based on its elastic modulus, outer diameter, and allowable stress during bending. Based on the elastic modulus of the first pipe segment, the outer diameter of the pipe segment, and the allowable stress during bending, the allowable bending radius of the first pipe segment is calculated. The allowable bending radius of the first pipe segment is equal to the product of the elastic modulus of the first pipe segment and the outer diameter of the first pipe segment, divided by twice the allowable stress during bending.

3. The method for laying heating pipelines at corners according to claim 1, characterized in that, Before laying the first pipe segment by bending it into a curved pipe segment using an elastic bending method if the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment, the method further includes: Excavate the trenches corresponding to the curved pipe sections and the straight pipe sections at both ends of the curved pipe sections according to the drawings.

4. The method for laying heating pipelines at corners according to claim 1, characterized in that, If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe segment, then using an elastic bending laying method to bend the first pipe segment into a bent pipe segment for laying further includes: If the actual turning angle during construction is less than the maximum allowable turning angle of the first pipe section, then lay the straight pipe sections at both ends of the curved pipe section according to the drawings. Connect one end of the first pipe segment to one of the straight pipe segments; An external force is applied to bend the first pipe segment into a curved pipe segment that meets the requirements of the drawing, and the other end of the first pipe segment is connected to another straight pipe segment; Remove external forces and complete the laying of the curved pipe section.

5. The method for laying heating pipelines at bends according to claim 4, characterized in that, The external force applied to bend the first pipe segment to the radius of curvature required by the drawing is applied manually or by machine.

6. The method for laying heating pipelines at corners according to claim 4, characterized in that, The process of removing external force and completing the laying of the curved pipe section specifically involves: Remove the external force and check whether the bending condition of the bent pipe section is consistent with the drawing. If it is consistent, the laying of the bent pipe section is complete.

7. The method for laying heating pipelines at corners according to claim 4, characterized in that, Specifically, the connection between one end of the first pipe segment and one of the straight pipe segments is as follows: Adjust the first pipe segment so that its axis coincides with that of the straight pipe segment, and connect one end of the first pipe segment to one of the straight pipe segments.

8. The method for laying heating pipelines at corners according to claim 4, characterized in that, The process of applying external force to bend the first pipe segment into a curved pipe segment that meets the requirements of the drawing, and connecting the other end of the first pipe segment to another straight pipe segment, specifically involves: Apply external force to bend the first pipe section to a bend that meets the requirements of the drawing, adjust the pipe opening of the first pipe section to make it concentric with the corresponding straight pipe section, and connect the other end of the first pipe section to another straight pipe section.

9. The method for laying heating pipelines at corners according to claim 4, characterized in that, Specifically, the connection between one end of the first pipe segment and one of the straight pipe segments is as follows: Weld one end of the first pipe section to one of the straight pipe sections.

10. The method for laying heating pipelines at corners according to claim 4, characterized in that, The process of applying external force to bend the first pipe segment into a curved pipe segment that meets the requirements of the drawing, and connecting the other end of the first pipe segment to another straight pipe segment, specifically involves: An external force is applied to bend the first pipe section into a curved section that meets the requirements of the drawing, and the other end of the first pipe section is welded to another straight pipe section.

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