A pipeline brace with high critical instability load and assembly method thereof

Abstract

The present invention discloses a pipeline brace rod with a high critical buckling load and an assembly method thereof, wherein two groups of open supports are respectively arranged on both sides of a main bearing cylinder, and each open support in the same group of open supports is evenly distributed along the axial direction, wherein the number of open supports in each group of open supports is N+1, and the N+1 open supports divide the main bearing cylinder into N along the axial direction; the left brace rod passes through each open support on the first group of open supports, and the right brace rod passes through each open support on the second group of open supports, and left-side separating nuts are arranged on both sides of each open support in the first group of open supports, wherein the left brace rod passes through the left-side separating nut, and right-side separating nuts are arranged on both sides of each open support in the second group of open supports, wherein the right brace rod passes through the right-side separating nut, and the brace rod has a higher critical buckling load and is relatively easy to assemble.

Description

Technical Field

[0001] The invention relates to a pipeline bracing rod and an assembly method thereof, and in particular to a pipeline bracing rod with a high critical destabilization load and an assembly method thereof. Background Art

[0002] Pipelines are transportation systems that connect two or more devices to transport media. They are widely used in energy industries such as thermal power plants, nuclear power plants, and petrochemicals. During service, in order to overcome the effects of mechanical loads, displacement loads, and thermal loads, it is necessary to arrange hanging devices at appropriate locations on the pipeline to ensure the safe operation of the pipeline. Bracing rods are an important form of pipeline supports and hangers. According to their functions, they can be divided into: limit bracing rods and impact-resistant component bracing rods. The limit bracing rod is a pipeline limit device, and its function is to provide a displacement "dead point" for the pipeline in a certain direction to control the cold and hot states of the pipeline; the impact-resistant component bracing rod is usually used in conjunction with a damper, and its function is to transfer the impact force of the pipeline to the rooting structure.

[0003] At present, the use of tension rods mainly has the following problems: due to the limitations of on-site installation conditions, the length of the tension rods is often made according to the required dimensions on site. Under most conditions, the length-diameter of the tension rods is relatively large. When the tension rods are subjected to compressive loads, the tension rods become unstable and bend, losing their limiting / impact resistance functions, which in turn leads to problems such as abnormal pipeline expansion.

[0004] Therefore, it is necessary to design a more reasonable and effective pipeline bracing rod device, which needs to have a higher critical instability load at the same bracing rod length. Summary of the invention

[0005] The purpose of the present invention is to overcome the disadvantages of the prior art and provide a pipeline brace with a high critical buckling load and an assembly method thereof. The brace has a high critical buckling load and is easy to assemble.

[0006] To achieve the above-mentioned purpose, the pipeline bracing rod with high critical buckling load of the present invention comprises a main bearing cylinder, an upper connecting rod, a locking nut, a lower connecting rod, a right bracing rod, a left bracing rod and two sets of open supports;

[0007] The main bearing cylinder is connected to the upper connecting rod, and the main bearing cylinder is connected to the lower connecting rod. Two groups of open supports are arranged on the main bearing cylinder, wherein the two groups of open supports are respectively arranged on both sides of the main bearing cylinder, and each open support in the same group of open supports is evenly distributed along the axial direction, wherein the number of open supports in each group of open supports is N+1, and the N+1 open supports divide the main bearing cylinder into N evenly along the axial direction;

[0008] The left-side support rod passes through each open support on the first group of open supports, and the right-side support rod passes through each open support on the second group of open supports. Both sides of each open support in the first group of open supports are provided with left-side separating nuts, wherein the left-side support rod passes through the left-side separating nut, and both sides of each open support in the second group of open supports are provided with right-side separating nuts, wherein the right-side support rod passes through the right-side separating nut.

[0009] The main bearing cylinder is connected to the upper connecting rod through a right-hand thread.

[0010] The main bearing cylinder is connected to the lower connecting rod through a left-hand thread.

[0011] A locking nut is arranged between the upper connecting rod and the main bearing cylinder.

[0012] The opening support is welded to the main bearing cylinder.

[0013] The method for assembling a pipeline brace with a high critical buckling load of the present invention comprises the following steps:

[0014] First, preheat the main bearing cylinder and the open supports thereon to increase their temperature by ΔT, then keep them warm so that they can fully expand, then install the left and right tension rods, and then lock each open support with the left and right separation nuts, and then naturally cool the main bearing cylinder and the open supports thereon.

[0015] The supporting force F that the left and right bracing rods can provide for the main bearing cylinder is:

[0016] F=E1α(ΔT)S1

[0017] Among them, E1 is the elastic modulus of the material used for the main bearing cylinder, S1 is the cross-sectional area of ​​the main bearing cylinder, and α is the thermal expansion coefficient of the material used for the main bearing cylinder.

[0018] The axial load F that the pipeline tension rod with high critical instability load is subjected to in actual service y satisfy:

[0019]

[0020] F cr is the critical buckling load of the main bearing cylinder itself, F is the supporting force that the left and right tension rods can provide to the main bearing cylinder, E1 is the elastic modulus of the material used for the main bearing cylinder, I1 is the section inertia moment of the main bearing cylinder, l is the length of the main bearing cylinder, α is the thermal expansion coefficient of the material used for the main bearing cylinder, and S1 is the cross-sectional area of ​​the main bearing cylinder.

[0021] The maximum axial load F that the pipeline tension rod with a high critical instability load can withstand is max satisfy:

[0022]

[0023] Among them, F cr is the critical buckling load of the main bearing cylinder itself, F is the supporting force that the left and right brace rods can provide to the main bearing cylinder, E1 is the elastic modulus of the material used for the main bearing cylinder, I1 is the section moment of inertia of the main bearing cylinder, E2 is the mass elastic modulus of the material used for the left and right brace rods, I2 is the section moment of inertia of the left and right brace rods, l is the length of the main bearing cylinder, and μ is the ultimate critical buckling load amplification factor.

[0024] The ultimate critical instability load amplification factor μ is:

[0025]

[0026] The present invention has the following beneficial effects:

[0027] The pipeline bracing rod with high critical instability load and the assembly method thereof of the present invention are preheated to cause thermal expansion deformation of the main bearing cylinder, and the main bearing cylinder is supported by the right bracing rod and the left bracing rod to be subjected to thermal expansion deformation after cooling. The tensile force, when the above-mentioned bracing rod device is installed on site, its axial limit critical instability load Compared with the traditional brace of the same size, its ultimate critical instability load is increased times, simple structure and easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Figure 2 An exploded view of the present invention;

[0030] Figure 3 It is a schematic diagram of the force of the main bearing cylinder 1 in the present invention;

[0031] Figure 4 It is a schematic diagram of the force on the cylinder section between the two open supports of the main bearing cylinder 1 in the present invention.

[0032] Among them, 1 is the main bearing cylinder, 2 is the upper connecting rod, 21 is the locking nut, 3 is the lower connecting rod, 4 is the right side support rod, 401 is the right side separation nut, 5 is the left side support rod, and 501 is the left side separation nut. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0034] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0035] refer to Figures 1 to 4 The pipeline bracing rod with high critical buckling load of the present invention comprises a main bearing cylinder 1, an upper connecting rod 2, a locking nut 21, a lower connecting rod 3, a right bracing rod 4, a left bracing rod 5 and two sets of open supports;

[0036] One end of the main bearing cylinder 1 is connected to the upper connecting rod 2 through a right-handed thread, and the other end of the main bearing cylinder 1 is connected to the lower connecting rod 3 through a left-handed thread. A locking nut 21 is arranged between the upper connecting rod 2 and the main bearing cylinder 1. Two groups of open supports are arranged on the main bearing cylinder 1, wherein the two groups of open supports are respectively arranged on both sides of the main bearing cylinder 1, and each open support in the same group of open supports is evenly distributed along the axial direction, wherein the number of open supports in each group of open supports is N+1, and the N+1 open supports divide the main bearing cylinder 1 into N along the axial direction, and the open supports are welded to the main bearing cylinder 1.

[0037] The left-side support rod 5 passes through each open support on the first group of open supports, and the right-side support rod 4 passes through each open support on the second group of open supports. Both sides of each open support in the first group of open supports are provided with left-side separation nuts 501, wherein the left-side support rod 5 passes through the left-side separation nut 501, and both sides of each open support in the second group of open supports are provided with right-side separation nuts 401, wherein the right-side support rod 4 passes through the right-side separation nut 401.

[0038] During installation, the main bearing cylinder 1 and the open supports thereon are preheated to increase their temperature by ΔT, and then kept warm for 30 minutes to allow the main bearing cylinder 1 and the open supports thereon to fully expand, and then the left-side tension rod 5 and the right-side tension rod 4 are installed, and then each open support is locked by the left-side separation nut 501 and the right-side separation nut 401, and then the main bearing cylinder 1 and the open supports thereon are naturally cooled.

[0039] Assume that the main bearing cylinder 1 undergoes thermal expansion and deformation after being heated, wherein the thermal expansion and deformation amount Δl is:

[0040] Δl=lα(ΔT)

[0041] Under the support of the left-side tension rod 5 and the right-side tension rod 4, the tensile strain ε of the cooled main bearing cylinder 1 is:

[0042]

[0043] Therefore, the supporting force F that the left-side bracing rod 5 and the right-side bracing rod 4 can provide to the main bearing cylinder 1 is:

[0044] F=E1α(ΔT)S1

[0045] Since the left and right tension rods 5 and 4 are compressed by the main bearing cylinder 1, they will also become unstable. Therefore, it is necessary to control the compression force of the main bearing cylinder 1 on the left and right tension rods 5 and 4, that is, to control the heating temperature of the main bearing cylinder 1, that is:

[0046]

[0047] Therefore, ΔT needs to satisfy:

[0048]

[0049] The axial load F that the pipeline tension rod with high critical instability load is subjected to in actual service y satisfy:

[0050] F y -F≤F cr

[0051] Right now:

[0052]

[0053] The maximum axial load F that the pipeline tension rod with a high critical instability load can withstand is max satisfy:

[0054]

[0055] Where μ is the ultimate critical instability load amplification factor, μ is:

[0056]

[0057] Wherein, l is the length of the main bearing cylinder 1, E1 is the elastic modulus of the material used for the main bearing cylinder 1, S1 is the cross-sectional area of ​​the main bearing cylinder 1, I1 is the section moment of inertia of the main bearing cylinder 1, E2 is the mass elastic modulus of the material used for the left brace rod 5 and the right brace rod 4, I2 is the section moment of inertia of the left brace rod 5 and the right brace rod 4, S2 is the cross-sectional area of ​​the left brace rod 5 and the right brace rod 4, α is the thermal expansion coefficient of the material used for the main bearing cylinder 1, F cr is the critical instability load of the main bearing cylinder 1 itself, F c ' r It is the critical instability load of the rod section between adjacent open supports on the left-side bracing rod 5 and the right-side bracing rod 4.

[0058] In summary, the pipeline bracing rod with high critical instability load of the present invention has an increased critical instability load compared with the traditional bracing rod of the same size. times.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A pipeline brace with a high critical buckling load, characterized in that: It comprises a main bearing cylinder (1), an upper connecting rod (2), a locking nut (21), a lower connecting rod (3), a right side bracing rod (4), a left side bracing rod (5) and two groups of open supports; The main bearing cylinder (1) is connected to an upper connecting rod (2), and the main bearing cylinder (1) is connected to a lower connecting rod (3). Two groups of open supports are arranged on the main bearing cylinder (1), wherein the two groups of open supports are respectively arranged on two sides of the main bearing cylinder (1), and each open support in the same group of open supports is evenly distributed along the axial direction, wherein the number of open supports in each group of open supports is N+1, and the N+1 open supports divide the main bearing cylinder (1) into N equal parts along the axial direction; The left-side support rod (5) passes through each open support on the first group of open supports, and the right-side support rod (4) passes through each open support on the second group of open supports. Both sides of each open support in the first group of open supports are provided with left-side separation nuts (501), wherein the left-side support rod (5) passes through the left-side separation nut (501), and both sides of each open support in the second group of open supports are provided with right-side separation nuts (401), wherein the right-side support rod (4) passes through the right-side separation nut (401).

2. The pipeline brace with high critical buckling load according to claim 1, characterized in that: The main bearing cylinder (1) is connected to the upper connecting rod (2) via a right-hand thread.

3. The pipeline brace with high critical buckling load according to claim 1, characterized in that: The main bearing cylinder (1) is connected to the lower connecting rod (3) via a left-handed thread.

4. The pipeline brace with high critical buckling load according to claim 1, characterized in that: A locking nut (21) is provided between the upper connecting rod (2) and the main bearing cylinder (1).

5. The pipeline brace with high critical buckling load according to claim 1, characterized in that: The opening support is welded to the main bearing cylinder (1).

6. A method for assembling a pipeline brace having a high critical buckling load as claimed in claim 1, characterized in that: The following steps are involved: First, the main bearing cylinder (1) and the open supports thereon are preheated to increase their temperature by ΔT, and then kept warm so that the main bearing cylinder (1) and the open supports thereon are fully expanded, and then the left-side tension rod (5) and the right-side tension rod (4) are installed, and then the open supports are locked by the left-side separation nut (501) and the right-side separation nut (401), and then the main bearing cylinder (1) and the open supports thereon are naturally cooled.

7. The method for assembling a pipeline brace with a high critical buckling load according to claim 6, characterized in that: The supporting force F that the left-side support rod (5) and the right-side support rod (4) can provide for the main bearing cylinder (1) is: F=E1α(ΔT)S1 Wherein, E1 is the elastic modulus of the material used for the main bearing cylinder (1), S1 is the cross-sectional area of ​​the main bearing cylinder (1), and α is the thermal expansion coefficient of the material used for the main bearing cylinder (1).

8. The method for assembling a pipeline brace with a high critical buckling load according to claim 6, characterized in that: The axial load F that the pipeline tension rod with high critical instability load is subjected to in actual service y satisfy: F cr is the critical buckling load of the main bearing cylinder (1) itself, F is the supporting force that the left-side tension rod (5) and the right-side tension rod (4) can provide to the main bearing cylinder (1), E1 is the elastic modulus of the material used for the main bearing cylinder (1), I1 is the cross-sectional inertia moment of the main bearing cylinder (1), l is the length of the main bearing cylinder (1), α is the thermal expansion coefficient of the material used for the main bearing cylinder (1), and S1 is the cross-sectional area of ​​the main bearing cylinder (1).

9. The method for assembling a pipeline brace with a high critical buckling load according to claim 6, characterized in that: The maximum axial load F that the pipeline tension rod with a high critical instability load can withstand is max satisfy: Among them, F cr is the critical buckling load of the main bearing cylinder (1) itself, F is the supporting force that the left brace rod (5) and the right brace rod (4) can provide for the main bearing cylinder (1), E1 is the elastic modulus of the material used for the main bearing cylinder (1), I1 is the cross-sectional inertia moment of the main bearing cylinder (1), E2 is the mass elastic modulus of the material used for the left brace rod (5) and the right brace rod (4), I2 is the cross-sectional inertia moment of the left brace rod (5) and the right brace rod (4), l is the length of the main bearing cylinder (1) and μ is the limit critical buckling load amplification factor.

10. The method for assembling a pipeline brace with a high critical buckling load according to claim 9, characterized in that: The ultimate critical instability load amplification factor μ is:

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