Full-scale four-point bending test apparatus

Abstract

The present invention provides a full-scale four-point bending test device, comprising: a loading component for applying a load to a pipeline; a supporting component, the supporting component being arranged on the side of the loading component and being used to support the pipeline during the process of applying the load to the pipeline; the loading component comprising a locking assembly, the locking assembly having an accommodating space for accommodating the pipeline; a bearing assembly, the bearing assembly being arranged above the locking assembly and connected to the locking assembly, the bearing assembly being connected to a power device on a side away from the locking assembly, so that the pressure generated by the power device is transmitted to the pipeline through the bearing assembly; wherein the locking assembly and the bearing assembly are connected by a transition piece, so that the pressure on the bearing assembly is transmitted to the locking assembly through the transition piece, so as to solve the problem of low measurement accuracy of the full-scale four-point bending test device in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of pipeline bending test devices, in particular to a full-scale four-point bending test device. Background Art

[0002] At present, land-based oil and gas pipelines are usually buried underground and are inevitably subject to ground movements such as faults, ground subsidence and landslides. Under the action of these ground movements, the pipelines will be subjected to large bending moments or large bending deformations. The pipelines may experience local buckling, resulting in pipeline instability and failure. More seriously, the pipelines that experience local buckling may be broken on their tensile side, causing leakage of the pipeline conveying medium, resulting in casualties, environmental damage and waste of resources.

[0003] Therefore, by using the four-point bending test device for pipelines, the bending performance of the pipes is measured to facilitate the buckling assessment during pipeline laying and operation, thereby ensuring safe and economical operation of the pipelines. Among them, the four-point bending test is a test method for measuring the bending performance of the test object. The test object is placed in the device to form a simply supported beam. There are two lower support points at both ends of the pipeline and two loading points in the middle of the pipeline. This is called four-point bending.

[0004] However, since most of the pipes are hollow structures, existing bending test devices are prone to causing pipe deformation during measurement, making it difficult to ensure the accuracy of the measurement results. Summary of the Invention

[0005] The main purpose of the present invention is to provide a full-scale four-point bending test device to solve the problem of low measurement accuracy of the full-scale four-point bending test device in the prior art.

[0006] In order to achieve the above-mentioned objectives, the present invention provides a full-size four-point bending test device, comprising: a loading component for applying a load to a pipeline; a supporting component, the supporting component being arranged on the side of the loading component, for supporting the pipeline during the process of applying the load to the pipeline; the loading component including a locking assembly, the locking assembly having an accommodating space for accommodating at least a portion of the pipeline; a load-bearing assembly, the load-bearing assembly being arranged above the locking assembly and connected to the locking assembly, the load-bearing assembly being connected to a power device on a side away from the locking assembly, so that the pressure generated by the power device is transmitted to the pipeline through the load-bearing assembly; wherein the locking assembly and the load-bearing assembly are connected by a transition piece, so that the pressure on the load-bearing assembly is transmitted to the locking assembly through the transition piece.

[0007] By providing an accommodating space on the locking assembly that can accommodate at least a portion of the pipeline, the stress-bearing portion of the pipeline can be evenly stressed to avoid deformation of the pipeline, thereby improving the accuracy of the measurement result.

[0008] Furthermore, the loading component also includes: a connecting assembly, the connecting assembly includes a first connecting member and a second connecting member connected to each other, the first connecting member is connected to the load-bearing assembly, the second connecting member is connected to the transition member, and at least a portion of the first connecting member is in contact with the transition member so that when the load is applied to the load by the load-bearing assembly, the load is transferred to the transition member through the first connecting member.

[0009] Furthermore, the end surface where the first connecting piece contacts the transition piece is an arc surface.

[0010] Furthermore, there are two second connecting members, the first connecting member is arranged between the two second connecting members, the first connecting member is provided with a first through hole, and the two second connecting members are respectively provided with a second through hole, so as to connect the first connecting member and the second connecting member by allowing at least part of the connecting pin to pass through the first through hole and the second through hole.

[0011] Furthermore, the locking assembly includes: a first locking block, a first notch is provided on the first locking block, and a transition piece is provided on a side of the first locking block away from the first notch; a second locking block, a second notch is provided on the second locking block, and the first locking block and the second locking block are arranged opposite to each other to form an accommodating space between the first notch and the second notch; the first notch and the second notch are both constructed to be able to fit with at least a portion of the outer wall of the pipe.

[0012] Furthermore, a support member is provided on a side of the second locking block away from the second notch to support the second locking block.

[0013] Furthermore, the load-bearing assembly includes: a connecting plate, a first side of the connecting plate is used to connect to the power device, and the other side of the connecting plate is connected to the transition piece.

[0014] Furthermore, there are two supporting components, which are respectively arranged on both sides of the loading component.

[0015] Furthermore, the support component includes: a first support plate; a second support plate, the first support plate and the second support plate are arranged relative to each other, a support rod is provided between the first support plate and the second support plate, and at least part of the pipeline is overlapped on the support rod.

[0016] Furthermore, the support rod is rotatably arranged around its axis between the first support plate and the second support plate.

[0017] By applying the technical solution of the present invention, a full-scale four-point bending test device includes a loading component and a supporting component, wherein the loading component is used to apply a load to the pipeline, and the supporting component is arranged on the side of the loading component, and is used to support the pipeline during the process of applying the load to the pipeline, wherein the loading component includes a locking assembly and a load-bearing assembly, the locking assembly has a accommodating space for accommodating the pipeline, the load-bearing assembly is arranged above the locking assembly and connected to the locking assembly, and the load-bearing assembly is connected to the power device on a side away from the locking assembly so that the pressure generated by the power device is transmitted to the pipeline through the load-bearing assembly; wherein the locking assembly and the load-bearing assembly are connected by a transition piece so that the pressure on the load-bearing assembly is transmitted to the locking assembly through the transition piece, the structure is simple and easy to operate, so that the pipeline can more easily achieve the bending curvature, thereby improving the measurement accuracy of the full-scale four-point bending test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings.

[0019] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 A schematic structural diagram of an embodiment of a full-scale four-point bending test apparatus according to the present invention is shown; and

[0021] Figure 2 A schematic diagram of the force on a pipeline using the full-scale four-point bending test device of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Loading component; 20. Support component; 11. Locking assembly; 12. Load-bearing assembly; 30. Transition piece; 13. Connecting assembly; 130. First connecting member; 131. Second connecting member; 110. First locking block; 111. Second locking block; 120. Connecting plate; 21. First support plate; 22. Second support plate; 23. Support rod; 24. Reinforcement plate; 25. Bottom plate; 26. Reinforcement rib; 27. Mounting hole. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] This invention provides a full-scale four-point bending test device, please refer to Figure 1 and Figure 2 , including: a loading component 10, used to apply a load to the pipeline; a supporting component 20, the supporting component 20 is arranged on the side of the loading component 10, and is used to support the pipeline during the process of applying the load to the pipeline; the loading component 10 includes a locking assembly 11, the locking assembly 11 has an accommodating space for accommodating at least a portion of the pipeline; a load-bearing assembly 12, the load-bearing assembly 12 is arranged above the locking assembly 11 and connected to the locking assembly 11, and the side of the load-bearing assembly 12 away from the locking assembly 11 is connected to the power device, so that the pressure generated by the power device is transmitted to the pipeline through the load-bearing assembly 12; wherein, the locking assembly 11 and the load-bearing assembly 12 are connected by a transition piece 30, so that the pressure on the load-bearing assembly 12 is transmitted to the locking assembly 11 through the transition piece 30.

[0028] The full-scale four-point bending test device provided by the present invention includes a loading component 10 and a supporting component 20. The loading component 10 is used to apply a load to the pipeline. The supporting component 20 is arranged on the side of the loading component 10 and is used to support the pipeline during the process of applying the load to the pipeline. The loading component 10 includes a locking component 11 and a load-bearing component 12. The locking component 11 has a accommodating space for accommodating the pipeline. The load-bearing component 12 is arranged above the locking component 11 and connected to the locking component 11. The side of the load-bearing component 12 away from the locking component 11 is connected to the power device so that the pressure generated by the power device is transmitted to the pipeline through the load-bearing component 12; the locking component 11 and the load-bearing component 12 are connected by a transition piece 30 to transmit the pressure on the load-bearing component 12 to the locking component 11 through the transition piece 30. The structure is simple and easy to operate, making it easier for the pipeline to achieve bending curvature, thereby improving the measurement accuracy of the full-scale four-point bending test device.

[0029] Specifically, the loading component 10 further includes: a connecting component 13, such as Figure 1As shown, there are two connection assemblies 13, wherein each connection assembly 13 includes a first connection member 130 and a second connection member 131 connected to each other. The first connection member 130 is connected to the load-bearing assembly 12, and the second connection member 131 is connected to the transition member 30. At least a portion of the first connection member 130 contacts the transition member 30, so that when a load is applied by the load-bearing assembly 12, the load is transferred to the transition member 30 through the first connection member 130. Because at least a portion of the first connection member 130 contacts the transition member 30, a portion of the load is transferred to the locking assembly 11 through the first connection member 130, making the connection between the first connection member 130 and the second connection member 131 more stable.

[0030] In the embodiment provided by the present invention, the end surface of the first connecting member 130 in contact with the transition member 30 is an arc surface.

[0031] In a specific implementation, there are two second connecting members 131, and the first connecting member 130 is disposed between the two second connecting members 131. The first connecting member 130 is provided with a first through hole, and the two second connecting members 131 are respectively provided with a second through hole. By passing at least a portion of the connecting pin through the first through hole and the second through hole, the first connecting member 130 and the second connecting member 131 are connected. By transmitting part of the load to the locking assembly 11 through the first connecting member 130, the load borne by the connecting pin can be reduced.

[0032] Specifically, the locking assembly 11 includes a first locking block 110 having a first notch, and a transition piece 30 disposed on a side of the first locking block 110 away from the first notch; and a second locking block 111 having a second notch. The first locking block 110 and the second locking block 111 are disposed opposite each other to form a receiving space between the first notch and the second notch. The first locking block 110 and the second locking block 111 are preferably made of wood, which is relatively hard and less likely to damage the pipe. Furthermore, the wood allows the pipe to move within the receiving space as it bends and moves downward, facilitating load application.

[0033] Furthermore, the first notch and the second notch are configured to fit with at least a portion of the outer wall of the pipe. Figure 1 As shown, the first notch and the second notch are both constructed as arc-shaped notches, so that when the first notch and the second notch are arranged relative to each other, the accommodating space formed is a columnar space, and the columnar space can fit well with the outer wall of the pipe, thereby ensuring that when pressure is applied to the pipe, the force on the pipe can be more uniform, thereby avoiding deformation of the pipe and improving the accuracy of the measurement results.

[0034] Preferably, a support member is provided on a side of the second locking block 111 away from the second notch to support the second locking block 111 .

[0035] In a specific implementation, the load-bearing assembly 12 includes a connecting plate 120, a first side of which is used to connect to a power device, and the other side of the connecting plate 120 is connected to the transition piece 30. A threaded rod is provided on the connecting plate 120 for connecting to the power device, which can be a hydraulic device or other device capable of applying force.

[0036] Preferably, there are two supporting components 20 , and the two supporting components 20 are respectively arranged on both sides of the loading component 10 .

[0037] In a specific implementation, the support component 20 includes a first support plate 21 and a second support plate 22. The first support plate 21 and the second support plate 22 are spaced apart from each other. A support rod 23 is disposed between the first support plate 21 and the second support plate 22. At least a portion of the pipeline is overlapped on the support rod 23. The support rod 23 is preferably a roller to support the pipeline. When the loading component 10 applies a load to the pipeline, the roller rolls as the pipeline bends and moves downward, preventing damage to the pipeline.

[0038] Specifically, the support rod 23 is rotatably arranged around its axis between the first support plate 21 and the second support plate 22. For example, bearings are provided on the first support plate 21 and the second support plate 22, and the support rod 23 is rotatably connected to the first support plate 21 and the second support plate 22 through the bearings.

[0039] Among them, the support component 20 also includes: a reinforcing plate 24, a bottom plate 25, a reinforcing rib 26 and a mounting hole 27. The reinforcing plate 24 is arranged between the first support plate 21 and the second support plate 22, and is used to support the first support plate 21 and the second support plate 22. Specifically, the first support plate 21 and the second support plate 22 are arranged on the bottom plate 25, and the bottom plate 25 is provided with a mounting hole 27. The mounting hole 27 is used to install a fixing bolt to fix the support component 20 in a predetermined position. In order to further increase the supporting strength of the support component 20, reinforcing ribs 26 are further provided between the first support plate 21 and the bottom plate 25 and between the second support plate 22 and the bottom plate 25 to ensure the stability of the pipeline during the test.

[0040] The schematic diagram of the pipeline force during the test is as follows Figure 2As shown, during the test, the connecting plate 120 is subjected to a downward load applied by the power device. The pipe on one side rotates clockwise under the action of the locking assembly, and the pipe on the other side rotates counterclockwise under the action of the locking assembly. The locking assembly applies pressure in the direction perpendicular to the pipe and friction along the tangential direction of the pipe to the pipe. Since the first locking block and the second locking block apply different forces, FN1 is greater than FN2, and f1 is greater than f2. The direction of the resultant force of FN1, FN2, f1, and f2 is vertically downward, and the magnitude of the resultant force is equal to the force applied by the connecting plate on this side. The support rod applies a supporting force FN3 and a friction force f3 to the pipe. The direction of the resultant force of FN3 and f3 is upward, which is balanced with the downward force transmitted by the locking assembly, generating a bending moment. The pipe end opposite to the middle of the connecting plate is subjected to pure bending, and the pipes at both ends are subjected to lateral bending.

[0041] The full-scale four-point bending test device provided by the present invention is suitable for full-scale four-point bending tests of oil and gas pipelines (intact pipelines or pipelines with defects), studying the buckling phenomenon and bending resistance of oil and gas pipelines, and obtaining the critical bending moment, critical strain and buckling shape of the pipeline.

[0042] The full-scale four-point bending test device provided by the present invention improves the existing full-scale four-point bending test device and makes it suitable for oil and gas pipeline structures, which is reflected in the following aspects: the load is transmitted by pin connection, so that the wooden block in direct contact with the pipeline can rotate with the pipeline. Compared with the fixed pressure head, this loading method is more reasonable; the wooden block and the pipeline are in direct contact, which avoids the damage to the pipeline caused by other steel pressure heads; the support roller rotates as the pipeline bends downward. Compared with the general fixed support, the sliding friction is changed to static friction, making the test easier to conduct. In addition, the rotation of the support roller also helps to move the pipeline downward, reducing the downward displacement of the distribution beam, making it easier to achieve the predetermined bending curvature, and helping to complete the test more efficiently.

[0043] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0044] The full-scale four-point bending test device provided by the present invention includes a loading component 10 and a supporting component 20. The loading component 10 is used to apply a load to the pipeline. The supporting component 20 is arranged on the side of the loading component 10 and is used to support the pipeline during the process of applying the load to the pipeline. The loading component 10 includes a locking component 11 and a load-bearing component 12. The locking component 11 has a accommodating space for accommodating the pipeline. The load-bearing component 12 is arranged above the locking component 11 and connected to the locking component 11. The side of the load-bearing component 12 away from the locking component 11 is connected to the power device so that the pressure generated by the power device is transmitted to the pipeline through the load-bearing component 12; the locking component 11 and the load-bearing component 12 are connected by a transition piece 30 to transmit the pressure on the load-bearing component 12 to the locking component 11 through the transition piece 30. The structure is simple and easy to operate, making it easier for the pipeline to achieve bending curvature, thereby improving the measurement accuracy of the full-scale four-point bending test device.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A full-scale four-point bending test device, characterized in that: include: A loading component (10) for applying a load to the pipeline; a supporting component (20), the supporting component (20) being arranged on the side of the loading component (10) and being used to support the pipeline during the process of applying a load to the pipeline; The loading component (10) includes a locking assembly (11), wherein the locking assembly (11) has an accommodating space for accommodating at least a portion of the pipe; the loading component (10) further includes a connecting assembly (13), wherein the connecting assembly (13) includes a first connecting member (130) and a second connecting member (131) connected to each other, wherein the first connecting member (130) is connected to the load-bearing assembly (12), and the second connecting member (131) is connected to the transition member (30), and at least a portion of the first connecting member (130) is in contact with the transition member (30) so as to prevent the load from being applied to the load-bearing assembly (12). , a load is transmitted to the transition piece (30) through the first connecting piece (130); the end surface of the first connecting piece (130) in contact with the transition piece (30) is an arc surface; there are two second connecting pieces (131), the first connecting piece (130) is arranged between the two second connecting pieces (131), the first connecting piece (130) is provided with a first through hole, and the two second connecting pieces (131) are respectively provided with a second through hole, so that the first connecting piece (130) and the second connecting piece (131) are connected by allowing at least a portion of the connecting pin to pass through the first through hole and the second through hole; a bearing assembly (12), the bearing assembly (12) being arranged above the locking assembly (11) and connected to the locking assembly (11), the bearing assembly (12) being connected to a power device on a side away from the locking assembly (11), so that pressure generated by the power device is transmitted to the pipeline through the bearing assembly (12); The locking assembly (11) and the bearing assembly (12) are connected via a transition piece (30), so that the pressure on the bearing assembly (12) is transmitted to the locking assembly (11) via the transition piece (30).

2. The full-scale four-point bending test device according to claim 1, characterized in that: The locking assembly (11) comprises: A first locking block (110), wherein the first locking block (110) is provided with a first notch, and the transition piece (30) is provided on a side of the first locking block (110) away from the first notch; a second locking block (111), wherein the second locking block (111) is provided with a second notch, and the first locking block (110) and the second locking block (111) are arranged opposite to each other to form an accommodating space between the first notch and the second notch; The first notch and the second notch are both configured to fit with at least a portion of the outer wall of the pipe.

3. The full-scale four-point bending test device according to claim 2, characterized in that: A support member is provided on a side of the second locking block (111) away from the second notch to support the second locking block (111).

4. The full-scale four-point bending test device according to claim 1, characterized in that: The bearing assembly (12) comprises: A connecting plate (120), wherein a first side of the connecting plate (120) is used to connect to a power device, and the other side of the connecting plate (120) is connected to the transition piece (30).

5. The full-scale four-point bending test device according to any one of claims 1 to 4, characterized in that: There are two supporting components (20), and the two supporting components (20) are respectively arranged on both sides of the loading component (10).

6. The full-scale four-point bending test device according to any one of claims 1 to 4, characterized in that: The supporting component (20) comprises: A first support plate (21); A second support plate (22), the first support plate (21) and the second support plate (22) are arranged relative to each other with a spacing therebetween, a support rod (23) is provided between the first support plate (21) and the second support plate (22), and at least a portion of the pipeline is overlapped on the support rod (23).

7. The full-scale four-point bending test device according to claim 6, characterized in that: The support rod (23) is rotatably arranged around its axis between the first support plate (21) and the second support plate (22).

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