Pipeline support hanger mechanism and method for determining pre-tightening force of pipe clamp bolt

Abstract

The invention belongs to the technical field of pipeline fixing, and discloses a pipeline support and hanger mechanism and a method for determining the pretightening force of a pipe clamp bolt, the support and hanger mechanism comprises a pipe clamp assembly, a cross arm beam and two hanging rods, an upper pipe clamp and a lower pipe clamp of the pipe clamp assembly each comprise an arc-shaped plate and an overhanging plate, and the overhanging plates of the arc-shaped plates and the overhanging plates are connected through fasteners; and the reinforcing plate is connected between the arc-shaped plate and the overhanging plate, so that the structure of the pipe clamp can be optimized, the deformation resistance of the pipe clamp is improved, and cost control is facilitated. The method comprises the steps that the corresponding relation between the rated load of the support and hanger mechanism and the pre-tightening force of a bolt is obtained; acquiring a rated load of the to-be-mounted support hanger mechanism; and according to the rated load of the to-be-mounted support hanger mechanism and the corresponding relation, the minimum pre-tightening force of the bolt of the to-be-mounted support hanger mechanism is determined. By means of the method, the reasonable bolt pre-tightening force of the pipe clamp assembly can be determined, the pipe clamp assembly has reasonable clamping force on the pipeline, the pipe clamp assembly is prevented from rotating relative to the pipeline, and it is guaranteed that the overall bearing of the support and hanger mechanism is normal.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline fixing, and in particular to a pipeline support and hanger mechanism and a method for determining the pre-tightening force of a pipe clamp bolt. Background Art

[0002] There are a large number of high-temperature and high-pressure pipelines in thermal power projects. The high-temperature and high-pressure pipelines are supported by support and hanger mechanisms to control the deformation, vibration, expansion, etc. of the pipelines. The support and hanger mechanisms include pipe clamps, cross arms, and hangers at both ends of the cross arms. The pipe clamps are connected to the cross arms through connecting seats. As the main load-bearing component, the pipe clamps play a role in transferring the load between the support and hanger and the pipeline.

[0003] In the actual operation of power plants, there will be a large number of problems of pipe clamps rotating and tilting relative to the pipeline, especially the support and hanger mechanism on high-temperature pipelines. As the parameters of thermal power units are getting higher and higher, the design temperature of the main steam pipeline and reheat steam pipeline exceeds 600℃. Pipe clamps are generally made of A335P91 or A335P92 materials. The material properties weaken at high temperatures, and creep and stress relaxation occur after long-term operation. In addition, the preload of the pipe clamp bolts is not standardized, and the clamping force of the pipe clamp drops rapidly. Under the action of external unbalanced loads, the pipe clamp rotates and tilts, causing the support and hanger spring to overload or lose load, seriously affecting the safe operation of the pressure pipeline.

[0004] In the prior art, the problem of the high-temperature pipe clamp tilting is usually solved by increasing the thickness of the pipe clamp material to reduce the stress level and deformation of the pipe clamp. However, due to the high cost of the alloy material used in the pipe clamp, the cost of the support and hanger mechanism will increase, reducing the competitiveness of the product. Especially for the installed support and hanger mechanism, the replacement cost is extremely high. In addition, if the preload force of the pipe clamp bolt is increased, the deformation of the pipe clamp may be aggravated, which will cause the clamping force to decrease, which is not conducive to solving the problem of the pipe clamp tilting.

[0005] Therefore, there is an urgent need for a pipeline support and hanger mechanism and a method for determining the preload force of the pipe clamp bolts to solve the above-mentioned problems existing in the prior art. Summary of the invention

[0006] The first object of the present invention is to provide a pipe support and hanger mechanism, which can optimize the structure of the pipe clamp, improve the anti-deformation ability of the pipe clamp, and help control costs.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] Provided is a pipeline support and hanger mechanism, comprising:

[0009] A pipe clamp assembly, comprising an upper pipe clamp, a lower pipe clamp and a fastener, wherein the upper pipe clamp and the lower pipe clamp each comprise an arc-shaped plate and overhanging plates respectively connected to both ends of the arc-shaped plate, the overhanging plates of the upper pipe clamp and the overhanging plates of the lower pipe clamp correspond to each other and are connected by the fastener, the arc-shaped plates of the upper pipe clamp and the arc-shaped plates of the lower pipe clamp are configured to clamp a pipe; a reinforcing plate is connected between the arc-shaped plate and the overhanging plate;

[0010] A cross beam connected to the lower pipe clamp;

[0011] Two hangers are provided, both of which are connected to the cross beam and are arranged on both sides of the pipe clamp assembly. One end of the hanger away from the cross beam is configured to be connected to a fixed structure.

[0012] As an optional solution of the pipe support and hanger mechanism provided by the present invention, a transition fillet is provided between the arc-shaped plate and the overhanging plate;

[0013] The reinforcing plate includes a fitting arc surface, a first connecting surface and a fitting plane which are connected in sequence. The fitting arc surface is fitted and connected to the arc plate, the fitting plane is fitted and connected to the overhanging plate, and the first connecting surface is opposite to the transition fillet and is arranged at an interval.

[0014] As an optional solution of the pipe support and hanger mechanism provided by the present invention, the maximum size of the first connecting surface along the first direction is S1, the maximum size of the first connecting surface along the second direction is S2, the maximum size of the fitting plane along the first direction is S3, and the maximum size of the fitting arc surface along the second direction is S4; the first direction and the second direction are parallel to the radial direction of the pipe clamp assembly, and the first direction is the extension direction of the overhanging plate;

[0015] Among them, S1 and S2 are both greater than the curvature radius of the transition fillet by at least 5 mm; the sum of S1 and S3 is equal to the sum of S2 and S4.

[0016] As an optional solution of the pipe support and hanger mechanism provided by the present invention, the reinforcing plate further includes a second connecting surface and a third connecting surface, and an end of the fitting plane away from the first connecting surface is connected to an end of the fitting arc surface away from the first connecting surface through the second connecting surface and the third connecting surface in sequence;

[0017] The second connecting surface is flush with the end surface of the overhanging plate.

[0018] As an optional solution of the pipe support and hanger mechanism provided by the present invention, at least two reinforcing plates are connected between each of the overhanging plates and the arc-shaped plates, and at least two of the reinforcing plates are arranged on both sides of the fastener along the axial direction of the pipe clamp assembly.

[0019] As an optional solution of the pipeline support and hanger mechanism provided by the present invention, the material of the reinforcing plate, the material of the upper pipe clamp and the material of the lower pipe clamp are the same.

[0020] The second object of the present invention is to provide a method for determining the preload force of a pipe clamp bolt, which can determine a reasonable preload force of the pipe clamp bolt, so that the pipe clamp has a reasonable clamping force on the pipeline, avoids the pipe clamp from rotating and tilting relative to the pipeline, and ensures that the overall load-bearing capacity of the support and hanger mechanism is in a normal state.

[0021] To achieve this object, the present invention adopts the following technical solutions:

[0022] A method for determining the preload force of a pipe clamp bolt is provided, which is applied to the pipe support and hanger mechanism as described above, wherein the fastener of the pipe support and hanger mechanism is a bolt, and the method comprises:

[0023] Obtaining the corresponding relationship between the rated load of the support and hanger mechanism and the preload force of the bolt;

[0024] Obtain the rated load of the support and hanger mechanism to be installed;

[0025] According to the rated load of the support and hanger mechanism to be installed and the corresponding relationship, the minimum pre-tightening force of the bolts of the support and hanger mechanism to be installed is determined.

[0026] As an optional solution of the method for determining the preload force of the pipe clamp bolt provided by the present invention, the obtaining of the corresponding relationship between the rated load of the support and hanger mechanism and the preload force of the bolt includes:

[0027] Obtaining the rated load 2F of the support and hanger mechanism;

[0028] Obtain the diameter D of the fixed pipe;

[0029] Obtaining a distance C between the two suspension rods;

[0030] Obtaining a vertical distance H between the center of the pipeline and the bearing point of the cross beam, wherein the bearing point of the cross beam is the connection point between the suspension rod and the cross beam;

[0031] The corresponding relationship is obtained according to the rated load 2F, the diameter D, the spacing C and the vertical distance H.

[0032] As an optional solution of the method for determining the preload force of the pipe clamp bolt provided by the present invention, the obtaining of the corresponding relationship according to the rated load 2F, the diameter D, the spacing C and the vertical distance H includes:

[0033] According to the spacing C, the vertical distance H and the deflection angle α, the lever arm L1 and the lever arm L2 of the two suspension rods to the pipeline are determined respectively; wherein the deflection angle α is the inclination angle of the suspension rod relative to the vertical direction; the lever arm L1 is the lever arm of one of the suspension rods to the pipeline, and the lever arm L2 is the lever arm of the other suspension rod to the pipeline;

[0034] According to the lever arm L1, the lever arm L2 and the rated load 2F, a first unbalanced moment ΔM1 is determined; wherein the first unbalanced moment ΔM1 is the moment of the support and hanger mechanism on the pipeline caused by the horizontal lateral thermal displacement of the pipeline;

[0035] Determine a second unbalanced moment ΔM2 according to the force arm L1, the force arm L2, the rated load 2F and the load deviation rate λ of the support and hanger mechanism; wherein the second unbalanced moment ΔM2 is the moment of the support and hanger mechanism on the pipeline caused by the load deviation;

[0036] The friction torque ΔM of the pipe clamp assembly on the pipe is determined according to the friction coefficient between the upper pipe clamp and the pipe, the friction coefficient between the lower pipe clamp and the pipe, the rated load 2F, and the diameter D of the pipe. f , and the estimated relationship between the preload force of the bolt;

[0037] According to the moment ΔM f The corresponding relationship is determined by comparing the first unbalanced torque ΔM1 with the second unbalanced torque ΔM2; wherein the comparing relationship is the torque ΔM f The torque is greater than the combined torque of the first unbalanced torque ΔM1 and the second unbalanced torque ΔM2.

[0038] As an optional solution of the method for determining the preload force of the pipe clamp bolt provided by the present invention, the deflection angle α is 4°, the load deviation rate λ of the support and hanger mechanism is 6%, the friction coefficient between the upper pipe clamp and the pipeline, and the friction coefficient between the lower pipe clamp and the pipeline are both 0.15, and the corresponding relationship is:

[0039] F'>(0.1395H+0.0599C-0.15D) / 0.3D·F;

[0040] Wherein, F' is the pre-tightening force of the bolt.

[0041] Beneficial effects of the present invention:

[0042] Under the preload applied by the fasteners and the high temperature of the pipeline during power operation, the stress at the connection between the arc plate and the overhang plate is high, resulting in relaxation deformation caused by stress, and the overhang plate of the upper pipe clamp and the overhang plate of the lower pipe clamp move closer to each other, resulting in a decrease in the axial force of the fasteners, a decrease in the clamping force of the pipe clamp assembly on the pipeline, and a decrease in the friction resistance between the pipe clamp assembly and the pipeline. When the horizontal lateral thermal displacement of the pipeline is large, a certain angle will be formed between the hanger and the cross beam, and the hangers at both ends of the cross beam will no longer have equal force arms and torques on the pipeline, so that the pipe clamp assembly has a tendency to twist relative to the pipeline. When the friction between the pipe clamp assembly and the pipeline is not enough to counteract the torque, the pipe clamp assembly and the cross beam will rotate and tilt. The pipe support and hanger mechanism provided by the present invention can effectively improve the connection strength between the arc plate and the overhanging plate by adding a reinforcing plate between the arc plate and the overhanging plate, reduce the possibility of deformation between the arc plate and the overhanging plate, reduce the deformation amount of the pipe clamp assembly, optimize the structure of the pipe clamp assembly, and improve the deformation resistance of the pipe clamp. At the same time, compared with increasing the thickness of the entire pipe clamp, it helps to control costs.

[0043] The method for determining the pre-tightening force of the pipe clamp bolt provided by the present invention can provide a reference basis for setting the pre-tightening force of the pipe clamp bolt during the subsequent installation of the support and hanger mechanism by establishing a corresponding relationship between the rated load of the support and hanger mechanism and the pre-tightening force of the bolt. After obtaining the corresponding relationship, the minimum pre-tightening force of the bolt of the support and hanger mechanism to be installed can be determined according to the rated load of the support and hanger mechanism to be installed and the corresponding relationship, thereby determining a reasonable bolt pre-tightening force of the pipe clamp assembly, so that the pipe clamp assembly has a reasonable clamping force on the pipeline, avoiding the pipe clamp assembly from rotating and tilting relative to the pipeline, and ensuring that the overall load of the support and hanger mechanism is in a normal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the drawings without creative work.

[0045] Figure 1 It is a first view of the pipeline support and hanger mechanism provided by a specific embodiment of the present invention;

[0046] Figure 2 is a second view of the pipeline support and hanger mechanism provided in a specific embodiment of the present invention;

[0047] Figure 3 is a third view of the pipeline support and hanger mechanism provided in a specific embodiment of the present invention;

[0048] Figure 4It is a structural schematic diagram of a reinforcement plate of a pipeline support and hanger mechanism provided in a specific embodiment of the present invention;

[0049] Figure 5 It is a schematic structural diagram of a curved plate, an overhanging plate and a reinforcing plate provided in a specific embodiment of the present invention;

[0050] Figure 6 It is a plan view of a pipe support and hanger mechanism provided in a specific embodiment of the present invention;

[0051] Figure 7 is a first flow chart of a method for determining a pre-tightening force of a pipe clamp bolt provided in a specific embodiment of the present invention;

[0052] Figure 8 is a second flow chart of a method for determining a pre-tightening force of a pipe clamp bolt provided in a specific embodiment of the present invention;

[0053] Fig. 9 This is a third flow chart of the method for determining the pre-tightening force of a pipe clamp bolt provided in a specific embodiment of the present invention.

[0054] In the figure:

[0055] 1. Pipe clamp assembly; 2. Crossbeam; 3. Hanging rod;

[0056] 11. Upper pipe clamp; 12. Lower pipe clamp; 13. Fastener; 14. Reinforcement plate;

[0057] 111. curved plate; 112. overhanging plate; 113. transition fillet;

[0058] 141, fitting arc surface; 142, first connecting surface; 143, fitting plane; 144, second connecting surface; 145, third connecting surface;

[0059] 31. rod body; 32. carrier plate;

[0060] 100. Pipeline; 200. Fixed structure. DETAILED DESCRIPTION

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0062] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0064] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0065] In this embodiment, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0066] In the embodiments of the present invention, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0067] like Figure 1 As shown, this embodiment provides a pipe support and hanger mechanism, which can optimize the structure of the pipe clamp, improve the deformation resistance of the pipe clamp, and help control costs.

[0068] The pipeline support and hanger mechanism includes a pipe clamp assembly 1, a crossbeam 2 and a hanger rod 3.

[0069] See also Figure 1 , Figure 2 as well as Figure 3 The pipe clamp assembly 1 includes an upper pipe clamp 11, a lower pipe clamp 12 and a fastener 13. The upper pipe clamp 11 and the lower pipe clamp 12 each include an arc plate 111 and an overhanging plate 112 respectively connected to both ends of the arc plate 111. The overhanging plate 112 of the upper pipe clamp 11 and the overhanging plate 112 of the lower pipe clamp 12 correspond to each other and are connected by the fastener 13. The arc plate 111 of the upper pipe clamp 11 and the arc plate 111 of the lower pipe clamp 12 are configured to clamp the pipe 100. A reinforcing plate 14 is connected between the arc plate 111 and the overhanging plate 112. The cross beam 2 is connected to the lower pipe clamp 12. Two suspension rods 3 are provided. The two suspension rods 3 are both connected to the cross beam 2 and are arranged on both sides of the pipe clamp assembly 1. One end of the suspension rod 3 away from the cross beam 2 is configured to be connected to the fixed structure 200. The fixed structure 200 is exemplarily a steel beam.

[0070] In this embodiment, the fastener 13 is a bolt, and a connection hole is provided on the overhang plate 112. The bolt passes through the connection holes on the two opposite overhang plates 112 and is threadedly connected with a nut, so that the upper pipe clamp 11 and the lower pipe clamp 12 are clamped on the pipe 100. There is a gap between the overhang plate 112 of the upper pipe clamp 11 and the overhang plate 112 of the lower pipe clamp 12.

[0071] Under the preload force applied by the fastener 13 and the high temperature of the pipeline 100 during power operation, the stress at the connection between the arc plate 111 and the overhang plate 112 is high, resulting in relaxation deformation caused by stress, and the overhang plate 112 of the upper pipe clamp 11 and the overhang plate 112 of the lower pipe clamp 12 move closer to each other, resulting in a reduction in the axial force of the fastener 13, and a decrease in the clamping force of the pipe clamp assembly 1 on the pipe 100, resulting in a decrease in the friction resistance between the pipe clamp assembly 1 and the pipe 100. When the horizontal lateral thermal displacement of the pipe 100 is large, a certain angle will be formed between the hanger 3 and the cross beam 2, and the hangers 3 at both ends of the cross beam 2 will no longer have equal force arms and moments on the pipe 100, so that the pipe clamp assembly 1 has a tendency to twist relative to the pipe 100. When the friction between the pipe clamp assembly 1 and the pipe 100 is not enough to counteract the moment, the pipe clamp assembly 1 and the cross beam 2 will rotate and tilt.

[0072] The pipe support and hanger mechanism provided in the embodiment of the present application can effectively improve the connection strength between the arc plate 111 and the overhanging plate 112 by adding a reinforcing plate 14 between the arc plate 111 and the overhanging plate 112, reduce the possibility of deformation between the arc plate 111 and the overhanging plate 112, reduce the deformation amount of the pipe clamp assembly 1, optimize the structure of the pipe clamp assembly 1, improve the deformation resistance of the pipe clamp, and at the same time, compared with increasing the thickness of the entire pipe clamp, help control costs.

[0073] In this embodiment, see Figure 2 and Figure 3A transition fillet 113 is provided between the arc plate 111 and the overhanging plate 112 to reduce stress concentration at the connection between the two and make the connection between the two smooth. Figure 4 As shown, the reinforcing plate 14 includes a fitting arc surface 141, a first connecting surface 142 and a fitting plane 143 which are connected in sequence. The fitting arc surface 141 fits and is connected to the arc plate 111, the fitting plane 143 fits and is connected to the overhanging plate 112, and the first connecting surface 142 is opposite to the transition fillet 113 and is arranged at a distance. By setting the fitting arc surface 141, there is a sufficient connection area between the outer wall of the arc plate 111 to ensure that the reinforcing plate 14 is firmly connected to the arc plate 111; by setting the fitting plane 143, there is a sufficient connection area between the overhanging plate 112 to ensure that the reinforcing plate 14 is firmly connected to the overhanging plate 112. There is a distance between the first connecting surface 142 and the transition fillet 113, so that this position has better force-bearing performance.

[0074] Exemplarily, the fitting arc surface 141 is welded to the arc plate 111, and the fitting plane 143 is welded to the overhanging plate 112. The double-sided full welding process is adopted during the specific welding.

[0075] like Figure 5 As shown, the maximum dimension of the first connecting surface 142 along the first direction is S1, and the maximum dimension of the first connecting surface 142 along the second direction is S2. The maximum dimension of the fitting plane 143 along the first direction is S3, and the maximum dimension of the fitting arc surface 141 along the second direction is S4. The first direction and the second direction are both parallel to the radial direction of the pipe clamp assembly 1, and the first direction is the extension direction of the overhanging plate 112. Figure 5 In the embodiment, S1 and S2 are both larger than the curvature radius of the transition fillet 113 by at least 5 mm, so as to avoid the poor force at the transition fillet 113 where the fitting arc surface 141 and the fitting plane 143 are connected. For example, S1 and S2 are both larger than the curvature radius of the transition fillet 113 by 5 mm, 6 mm, 7 mm, etc., and can be set according to the needs. The sum of S1 and S3 is equal to the sum of S2 and S4. Figure 5 S5 is equal to S6, so that the maximum dimension of the entire reinforcing plate 14 in the first direction is consistent with the maximum dimension of the entire reinforcing plate 14 in the second direction, and the arc plate 111 and the overhanging plate 112 are uniformly reinforced at the transition fillet 113.

[0076] like Figure 4As shown, the reinforcing plate 14 also includes a second connecting surface 144 and a third connecting surface 145, and the end of the fitting plane 143 away from the first connecting surface 142 is connected to the end of the fitting arc surface 141 away from the first connecting surface 142 through the second connecting surface 144 and the third connecting surface 145 in sequence; the second connecting surface 144 is flush with the end surface of the overhanging plate 112, that is, the fitting plane 143 extends to the end of the overhanging plate 112, thereby strengthening the strength of the overhanging plate 112 at various positions in the first direction and improving the deformation resistance of the overhanging plate 112.

[0077] At least two reinforcing plates 14 are connected between each overhang plate 112 and the arc plate 111, and at least two reinforcing plates 14 are arranged on both sides of the fastener 13 along the axial direction of the pipe clamp assembly 1 to evenly reinforce the upper pipe clamp 11 and the lower pipe clamp 12 on both sides of the fastener 13. In this embodiment, the pipe clamp assembly 1 is provided with eight reinforcing plates 14, four of which are provided for the upper pipe clamp 11 and four for the lower pipe clamp 12. Two reinforcing plates 14 are fully welded between each overhang plate 112 and the arc plate 111 to strengthen the strength of the entire pipe clamp assembly 1 and make it have a higher anti-deformation ability.

[0078] In this embodiment, the material of the reinforcing plate 14, the material of the upper pipe clamp 11 and the material of the lower pipe clamp 12 are the same, which can improve the welding quality and welding stability of the connection position between the reinforcing plate 14 and the curved plate 111 and the overhanging plate 112, and the welding position is not easy to break. Moreover, the design of the same material makes the reinforcing plate 14, the curved plate 111 and the overhanging plate 112 have the same thermal expansion coefficient, avoiding the generation of internal stress due to excessive thermal expansion differences.

[0079] This embodiment also provides a method for determining the preload force of a pipe clamp bolt, which can determine a reasonable preload force of the pipe clamp bolt, so that the pipe clamp has a reasonable clamping force on the pipe 100, avoiding the pipe clamp from rotating and tilting relative to the pipe 100, and ensuring that the overall load-bearing capacity of the support and hanger mechanism is in a normal state.

[0080] The method is applied to the pipeline support and hanger mechanism as described above, and the fastener 13 of the pipeline support and hanger mechanism is a bolt, such as Figure 7 As shown, the method specifically includes:

[0081] S1. Obtaining the corresponding relationship between the rated load of the support and hanger mechanism and the preload force of the bolt;

[0082] S2. Obtain the rated load of the support and hanger mechanism to be installed;

[0083] S3. Determine the minimum pre-tightening force of the bolts of the support and hanger mechanism to be installed according to the rated load and the corresponding relationship of the support and hanger mechanism to be installed.

[0084] The method for determining the pre-tightening force of the pipe clamp bolt provided in this embodiment can provide a reference for setting the pre-tightening force of the pipe clamp bolt during the subsequent installation of the support and hanger mechanism by establishing a corresponding relationship between the rated load of the support and hanger mechanism and the pre-tightening force of the bolt. After obtaining the corresponding relationship, the minimum pre-tightening force of the bolt of the support and hanger mechanism to be installed can be determined according to the rated load of the support and hanger mechanism to be installed and the corresponding relationship, thereby determining a reasonable bolt pre-tightening force of the pipe clamp assembly 1, so that the pipe clamp assembly 1 has a reasonable clamping force on the pipe 100, avoiding the pipe clamp assembly 1 from rotating and tilting relative to the pipe 100, and ensuring that the overall load of the support and hanger mechanism is in a normal state.

[0085] Specifically, see Figure 6 and Figure 8 In this embodiment, step S1 obtains the corresponding relationship between the rated load of the support and hanger mechanism and the preload force of the bolt, including:

[0086] S11, obtaining the rated load 2F of the support and hanger mechanism; the rated load on each hanger rod 3 is F;

[0087] S12, obtaining the diameter D of the fixed pipe 100;

[0088] S13, obtaining the distance C between the two suspension rods 3;

[0089] S14, obtaining a vertical distance H between the center of the pipeline 100 and the bearing point of the cross beam 2, wherein the bearing point of the cross beam 2 is the connection point between the suspension rod 3 and the cross beam 2;

[0090] S15. Obtain the above corresponding relationship according to the rated load 2F, the diameter D, the spacing C and the vertical distance H.

[0091] In step S14, combined Figure 3 The hanger 3 includes a rod body 31 and a carrier plate 32. The carrier plate 32 is arranged on the bottom surface of the cross beam 2. The lower end of the hanger 3 is provided with an external thread structure. The cross beam 2 includes two channel steels arranged back to back. The lower end of the hanger 3 passes through the two channel steels of the cross beam 2 and the carrier plate 32, and is threadedly connected with a nut. The above-mentioned "connection point between the hanger 3 and the cross beam 2" is the contact surface position between the nut and the carrier plate 32.

[0092] In step S15, based on the acquired rated load 2F, diameter D, spacing C and vertical distance H, the correspondence between the rated load of the support and hanger mechanism and the preload force of the bolt can be determined, that is, the acquired correspondence is related to the four parameters of the rated load 2F, diameter D, spacing C and vertical distance H. When determining the minimum preload force of the bolts of the support and hanger mechanism to be installed, it is only necessary to obtain these four parameters.

[0093] In this embodiment, see Fig. 9Step S15 obtains the corresponding relationship according to the rated load 2F, the diameter D, the spacing C and the vertical distance H, including:

[0094] S151, according to the spacing C, the vertical distance H and the deflection angle α, determine the lever arm L1 and the lever arm L2 of the two suspension rods 3 to the pipeline 100 respectively; wherein the deflection angle α is the inclination angle of the suspension rod 3 relative to the vertical direction; the lever arm L1 is the lever arm of one of the suspension rods 3 to the pipeline 100, and the lever arm L2 is the lever arm of the other suspension rod 3 to the pipeline 100;

[0095] S152, determining a first unbalanced moment ΔM1 according to the lever arm L1, the lever arm L2 and the rated load 2F; wherein the first unbalanced moment ΔM1 is the moment of the support and hanger mechanism on the pipeline 100 caused by the horizontal lateral thermal displacement of the pipeline 100;

[0096] S153, determining a second unbalanced moment ΔM2 according to the force arm L1, the force arm L2, the rated load 2F and the load deviation rate λ of the support and hanger mechanism; wherein the second unbalanced moment ΔM2 is the moment of the support and hanger mechanism on the pipeline 100 caused by the load deviation;

[0097] S154, determining the friction torque ΔM of the pipe clamp assembly 1 on the pipe 100 according to the friction coefficient between the upper pipe clamp 11 and the pipe 100, the friction coefficient between the lower pipe clamp 12 and the pipe 100, the rated load 2F, and the diameter D of the pipe 100 f , and the calculated relationship between the preload force of the bolt;

[0098] S155, according to the moment ΔM f The comparison relationship between the first unbalanced torque ΔM1 and the second unbalanced torque ΔM2 is used to determine the corresponding relationship; wherein the comparison relationship is the torque ΔM f Greater than the combined torque of the first unbalanced torque ΔM1 and the second unbalanced torque ΔM2.

[0099] If the bolt preload is too small, the clamping force of the pipe clamp assembly 1 will be insufficient. If the preload is too large, the bolts are prone to stress relaxation or fracture at high temperatures. Therefore, it is particularly necessary to determine a reasonable bolt preload. The sources of the rotation driving force of the pipe clamp assembly 1 are mainly two points: first, after the horizontal thermal displacement of the pipeline 100, the force arms of the hangers 3 on both sides are inconsistent, which generates an unbalanced torque on the pipeline 100, that is, the first unbalanced torque ΔM1 mentioned above; second, the loads of the hangers 3 on both sides are inconsistent, which generates an unbalanced torque, that is, the second unbalanced torque ΔM2 mentioned above. In order to suppress the rotation of the pipe clamp assembly 1 relative to the pipeline 100, its reaction force is mainly the friction force generated by the bolt preload acting on the pipe clamp assembly 1.

[0100] Step S151 and step S152 are for calculating the first unbalanced moment ΔM1.

[0101] In step S151, GB / T 17116.1-2018 "Pipeline Supports and Hangers Part 1: Technical Specifications" stipulates that the inclination α of the hanger rod 3 of the spring hanger shall not be greater than 4°. According to this limit case, the calculation (the load of the hanger rod 3 on one side is F) is as follows:

[0102]

[0103]

[0104] Then the moment of the support and hanger mechanism on the pipeline 100 caused by the horizontal lateral thermal displacement of the pipeline is:

[0105] ΔM1=F·(L2-L1)=2F·H·sinα.

[0106] Step S153 is to calculate the second unbalanced torque ΔM2.

[0107] GB / T 17116.1-2018 "Pipeline Supports and Hangers Part 1: Technical Specifications" stipulates that the load deviation rate λ of the spring support and hanger shall not be greater than 6%. The unbalanced torque generated by the load deviation is:

[0108] ΔM2=F·λ·L1+F·λ·L2=F·C·λ·cosα.

[0109] In step S154, assuming that the pipe clamp assembly 1 has a single bolt on one side, the preload force of the bolt is F′, the friction coefficient between the upper pipe clamp 11 and the pipe 100, and the friction coefficient between the lower pipe clamp 12 and the pipe 100 are both μ, and μ is 0.15, then the friction force between the upper pipe clamp 11 and the pipe 100 is:

[0110] f1=2F′·μ.

[0111] The friction force between the lower pipe clamp 12 and the pipe 100 is:

[0112] f2=2(F′+F)·μ.

[0113] Friction torque ΔM of the pipe clamp assembly 1 on the pipe 100 f for:

[0114] ΔM f =(f1+f2)·D / 2.

[0115] Substitute the friction force f1 and friction force f2 into the friction torque ΔM f The friction torque ΔM of the pipe clamp assembly 1 on the pipe 100 can be obtained from the formula f , and the estimated relationship between the preload force of the bolt.

[0116] In step S155, to ensure that the support and hanger mechanism is within the allowable range of the hanger rod inclination and the performance deviation is qualified, the pipe clamp assembly 1 does not rotate, and the friction torque ΔM of the pipe clamp assembly 1 is f Must be greater than the combined moment caused by horizontal thermal displacement and load deviation:

[0117] ΔM f >ΔM1+ΔM2.

[0118] It can be concluded that the corresponding relationship between the preload force of the bolts of the pipe clamp assembly 1 and the rated load of the support and hanger mechanism is:

[0119]

[0120] Furthermore, according to the minimum requirements of GB / T 17116.1-2018 for the performance and status of the support and hanger, the values ​​of various parameters are taken, the deflection angle α is 4°, the load deviation rate λ of the support and hanger mechanism is 6%, the friction coefficient between the upper pipe clamp 11 and the pipeline 100, and the friction coefficient between the lower pipe clamp 12 and the pipeline 100 are both 0.15, and the corresponding relationship is:

[0121]

[0122] Among them, F' is the preload force of the bolt. According to this method, when the design and selection of the support and hanger mechanism are confirmed, the minimum preload force of the pipe clamp bolt can be obtained.

[0123] For example, the design parameters of a set of support and hanger mechanisms for the main steam pipeline of a power plant are as follows: the diameter D of the main steam pipeline 100 is 471 mm, the load F is 58737 N, the vertical distance H between the center of the pipeline 100 and the bearing point of the cross beam 2 is 836 mm, and the spacing C between the hangers 3 at both ends is 2000 mm. Substituting the above bolt preload calculation formula into the formula, the following is obtained:

[0124] F′>34437.9N.

[0125] The pre-tightening force of the bolts of a single pipe clamp assembly 1 can be rounded to 35000N.

[0126] Through the method for determining the preload force of the pipe clamp bolt provided in this embodiment, a reasonable bolt preload force of the pipe clamp assembly 1 can be determined, so that the pipe clamp assembly 1 has a reasonable clamping force on the pipe 100, avoiding the pipe clamp assembly 1 from rotating and tilting relative to the pipe 100, and ensuring that the overall load-bearing capacity of the support and hanger mechanism is in a normal state.

[0127] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A pipeline support and hanger mechanism, characterized in that: include: A pipe clamp assembly (1) comprises an upper pipe clamp (11), a lower pipe clamp (12) and a fastener (13), wherein the upper pipe clamp (11) and the lower pipe clamp (12) both comprise an arc-shaped plate (111) and overhanging plates (112) respectively connected to both ends of the arc-shaped plate (111), the overhanging plates (112) of the upper pipe clamp (11) and the overhanging plates (112) of the lower pipe clamp (12) correspond to each other one by one and are connected via the fastener (13), the arc-shaped plates (111) of the upper pipe clamp (11) and the arc-shaped plates (111) of the lower pipe clamp (12) are configured to clamp a pipe (100); a reinforcing plate (14) is connected between the arc-shaped plate (111) and the overhanging plates (112); A cross beam (2) connected to the lower pipe clamp (12); Two suspension rods (3) are provided, and the two suspension rods (3) are both connected to the cross beam (2) and are respectively arranged on both sides of the pipe clamp assembly (1); one end of the suspension rod (3) away from the cross beam (2) is configured to be connected to a fixed structure (200).

2. The pipe support and hanger mechanism according to claim 1, characterized in that: A transition fillet (113) is provided between the arc-shaped plate (111) and the overhanging plate (112); The reinforcing plate (14) comprises a fitting arc surface (141), a first connecting surface (142) and a fitting plane (143) which are connected in sequence, the fitting arc surface (141) is fitted and connected to the arc-shaped plate (111), the fitting plane (143) is fitted and connected to the overhanging plate (112), and the first connecting surface (142) is opposite to the transition fillet (113) and is arranged at an interval.

3. The pipe support and hanger mechanism according to claim 2, characterized in that: The maximum dimension of the first connecting surface (142) along the first direction is S1, the maximum dimension of the first connecting surface (142) along the second direction is S2, the maximum dimension of the fitting plane (143) along the first direction is S3, and the maximum dimension of the fitting arc surface (141) along the second direction is S4; the first direction and the second direction are both parallel to the radial direction of the pipe clamp assembly (1), and the first direction is the extension direction of the overhanging plate (112); Wherein, both S1 and S2 are greater than the curvature radius of the transition fillet (113) by at least 5 mm; and the sum of S1 and S3 is equal to the sum of S2 and S4.

4. The pipeline support and hanger mechanism according to claim 2, characterized in that: The reinforcing plate (14) further comprises a second connecting surface (144) and a third connecting surface (145), and an end of the fitting plane (143) away from the first connecting surface (142) is connected to an end of the fitting arc surface (141) away from the first connecting surface (142) via the second connecting surface (144) and the third connecting surface (145) in sequence; The second connecting surface (144) is flush with the end surface of the overhanging plate (112).

5. The pipeline support and hanger mechanism according to any one of claims 1 to 4, characterized in that: At least two reinforcing plates (14) are connected between each of the overhanging plates (112) and the arc-shaped plates (111), and at least two of the reinforcing plates (14) are arranged on both sides of the fastener (13) along the axial direction of the pipe clamp assembly (1).

6. The pipeline support and hanger mechanism according to any one of claims 1 to 4, characterized in that: The material of the reinforcing plate (14), the material of the upper pipe clamp (11) and the material of the lower pipe clamp (12) are the same.

7. A method for determining the preload force of a pipe clamp bolt, characterized in that: Applied to the pipeline support and hanger mechanism according to any one of claims 1 to 6, the fastener of the pipeline support and hanger mechanism is a bolt, and the method comprises: Obtaining the corresponding relationship between the rated load of the support and hanger mechanism and the preload force of the bolt; Obtain the rated load of the support and hanger mechanism to be installed; According to the rated load of the support and hanger mechanism to be installed and the corresponding relationship, the minimum pre-tightening force of the bolts of the support and hanger mechanism to be installed is determined.

8. The method for determining the preload force of a pipe clamp bolt according to claim 7, characterized in that: The obtaining of the correspondence between the rated load of the support and hanger mechanism and the preload force of the bolt comprises: Obtaining the rated load 2F of the support and hanger mechanism; Obtain the diameter D of the fixed pipe; Obtaining a distance C between the two suspension rods; Obtaining a vertical distance H between the center of the pipeline and the bearing point of the cross beam, wherein the bearing point of the cross beam is the connection point between the suspension rod and the cross beam; The corresponding relationship is obtained according to the rated load 2F, the diameter D, the spacing C and the vertical distance H.

9. The method for determining the preload force of a pipe clamp bolt according to claim 8, characterized in that: The obtaining the corresponding relationship according to the rated load 2F, the diameter D, the spacing C, and the vertical distance H includes: According to the spacing C, the vertical distance H and the deflection angle α, the lever arm L1 and the lever arm L2 of the two suspension rods to the pipeline are determined respectively; wherein the deflection angle α is the inclination angle of the suspension rod relative to the vertical direction; the lever arm L1 is the lever arm of one of the suspension rods to the pipeline, and the lever arm L2 is the lever arm of the other suspension rod to the pipeline; According to the lever arm L1, the lever arm L2 and the rated load 2F, a first unbalanced moment ΔM1 is determined; wherein the first unbalanced moment ΔM1 is the moment of the support and hanger mechanism on the pipeline caused by the horizontal lateral thermal displacement of the pipeline; Determine a second unbalanced moment ΔM2 according to the force arm L1, the force arm L2, the rated load 2F and the load deviation rate λ of the support and hanger mechanism; wherein the second unbalanced moment ΔM2 is the moment of the support and hanger mechanism on the pipeline caused by the load deviation; The friction torque ΔM of the pipe clamp assembly on the pipe is determined according to the friction coefficient between the upper pipe clamp and the pipe, the friction coefficient between the lower pipe clamp and the pipe, the rated load 2F, and the diameter D of the pipe. f , and the estimated relationship between the preload force of the bolt; According to the moment ΔM f The corresponding relationship is determined by comparing the first unbalanced torque ΔM1 with the second unbalanced torque ΔM2; wherein the comparing relationship is the torque ΔM f The torque is greater than the combined torque of the first unbalanced torque ΔM1 and the second unbalanced torque ΔM2.

10. The method for determining the preload force of a pipe clamp bolt according to claim 9, characterized in that: The deflection angle α is 4°, the load deviation rate λ of the support and hanger mechanism is 6%, the friction coefficient between the upper pipe clamp and the pipeline, and the friction coefficient between the lower pipe clamp and the pipeline are both 0.15, and the corresponding relationship is: F'>(0.1395H+0.0599C-0.15D) / 0.3D·F; Wherein, F' is the pre-tightening force of the bolt.

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