Concrete pipeline creep performance detection device
By designing a concrete pipeline creep performance detection device that includes supporting steel frames, cantilever steel beams, positioning tooling and other components, the existing detection methods are complex, time-consuming and inaccurate results are solved, and efficient and accurate detection of the creep performance of concrete pipelines is achieved.
Patent Information
- Application Number
- CN202421767961.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-25
AI Technical Summary
The existing methods for creep performance detection of concrete pipelines are complex in operation, long time, and the detection results are inaccurate.
A concrete pipeline creep performance detection device is designed, including a support steel frame, cantilever steel beam, positioning tooling, hoisting drive parts, counterweight parts and pressure and creep detection units. The device realizes the creep performance detection of concrete pipelines through the articulation design of cantilever steel beams and the long-term loading of the hoisting drive parts, and is simple in structure and convenient in operation.
It realizes simple, efficient and accurate detection of the creep performance of concrete pipes, can adapt to test pieces of different sizes, and the measurement results are not affected by the deformation of the pressure structure, providing strong support for the design and use of concrete pipes.
Smart Images
Figure CN222994190U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of performance detection equipment for concrete pipes, and in particular to a device for detecting the creep performance of concrete pipes. Background Art
[0002] The phenomenon that the strain of concrete slowly increases with time under a constant stress. Tests have found that the creep deformation of concrete can reach 1 to 2 times, or even greater than, the elastic deformation. Therefore, the stress and deformation of a concrete structure calculated according to the elastic state only represent the situation when the load starts to act. In order to understand the stress and deformation of the structure during the entire working period, the creep performance of the material must be considered. Studying the creep of concrete and related calculation theories is of great significance for the safe and economical design of hydraulic concrete structures and reinforced concrete structures.
[0003] Concrete pipes are commonly used pipe materials in modern engineering, and their creep performance is an important indicator for evaluating their long-term stability and durability. However, existing methods for detecting the creep performance of concrete pipes often have problems such as complex operation, long time consumption, and inaccurate detection results. Therefore, it is of great significance to develop a simple, efficient, and accurate device for detecting the creep performance of concrete pipes. Content of the Utility Model
[0004] The problem to be solved by the utility model is to provide a device for detecting the creep performance of concrete pipes, which has the advantages of simple structure, convenient operation, a large range of test piece sizes that can be loaded, and the measurement result is not affected by the deformation of the pressure application structure, aiming at the above-mentioned deficiencies in the prior art.
[0005] The above-mentioned utility model purpose of the utility model is achieved through the following technical solutions:
[0006] A device for detecting the creep performance of concrete pipes, comprising a support steel frame, a cantilever steel beam hinged to the support steel frame, a positioning tooling arranged below the cantilever steel beam and used for placing a concrete pipe, jacking driving parts and counterweight parts arranged on both sides of the positioning tooling, and a pressure and creep detection unit. The output ends of the jacking driving parts and the counterweight parts respectively act on the cantilever steel beam to complete the selective pressure application of the cantilever steel beam on the positioning tooling. The pressure detection end of the pressure and creep detection unit is arranged between the cantilever steel beam and the positioning tooling, and the creep detection end is arranged on the concrete pipe of the positioning tooling.
[0007] By adopting the above technical solution, the concrete pipes are pre-lapped and installed on the positioning tooling in the axial horizontal manner, using the support steel frame as the support basis for the force application of the whole device. Its structural design ensures the stability and load-bearing capacity of the device. The cantilever steel beam is hinged to the support steel frame, which can not only adjust the angle and position as needed to adapt to concrete pipe specimens of different sizes, but also allows the cantilever beam to deform and rotate during the loading process, and the measurement results are not affected by the deformation of the pressure application structure. During the detection, the output shaft of the jacking drive member descends, and under the influence of its own weight and the gravity of the counterweight, the cantilever steel beam can achieve long-term loading on the positioning tooling, so that the positioning tooling can evenly transfer the pressure to the concrete pipes, thereby simulating the stress state of the concrete pipes in the actual working environment. This design can not only comprehensively detect the creep performance of the concrete pipes, but also adjust the magnitude of the applied pressure as needed to simulate different working conditions. During the long-term loading of the positioning tooling by the cantilever steel beam, the pressure detection end of the pressure and creep detection unit is used to indirectly measure the pressure acting on the concrete pipes, so as to adjust the output of the jacking drive member according to the loading requirements, and the creep detection end of the pressure and creep detection unit is used to detect the radial displacement, surface strain and crack width of the concrete pipes to match the relationship between pressure and creep, and the operation is simple and fast. In summary, the device has the advantages of simple structure, convenient operation, a large range of test piece sizes that can be loaded, and the measurement results are not affected by the deformation of the pressure application structure, etc., and can realize simple, efficient and accurate detection of the creep performance of concrete pipes, providing strong support for the design and use of concrete pipes.
[0008] The utility model is further configured as: the support steel frame includes a bottom frame, a vertical frame arranged on the bottom frame, and at least two diagonal braces arranged between the bottom frame and the vertical frame, and the cantilever steel beam is hinged to the vertical frame.
[0009] By adopting the above technical solution, the bottom frame serves as the support basis for the whole device, ensuring the overall stability of the device. The vertical frame provides a reliable installation position for the cantilever steel beam, and the diagonal braces increase the structural strength of the support steel frame, further ensuring the load-bearing capacity of the device. The cantilever steel beam is hinged to the vertical frame and can adjust the angle and position as needed to adapt to concrete pipe specimens of different sizes. This design makes the device have greater flexibility and can meet different detection requirements.
[0010] The utility model is further configured as: the cantilever steel beam includes a pair of first cross beams hinged to the vertical frame, a plurality of second cross beams arranged between the pair of first cross beams, and a pressure bar arranged on one of the second cross beams, and the bottom surface of the pressure bar is set as a convex surface with an arc-shaped outward protrusion.
[0011] By adopting the above technical solution, the reinforcing rib structure composed of the first cross beam and the second cross beam increases the structural strength of the cantilever steel beam, making it not easy to deform when the cantilever steel beam bears a large pressure, thus ensuring the accuracy of the detection result. At the same time, the cantilever steel beam can maintain a stable posture during the loading process, further improving the stability and reliability of the device.
[0012] The present utility model is further configured as: the positioning tooling includes a bearing beam, a lower wooden block arranged on the bearing beam, an upper wooden block arranged above the lower wooden block, and a loading beam arranged on the upper wooden block. A gap for the lap joint of the concrete pipe is formed between the lower wooden block and the upper wooden block, and the moving path of the pressure rod passes through the loading beam.
[0013] By adopting the above technical solution, a flexible contact relationship exists among the lower wooden block, the concrete pipe, and the upper wooden block. This design allows the concrete pipe to produce a certain deformation when subjected to pressure, thus better simulating its stress state in the actual working environment. At the same time, since the moving path of the pressure rod passes through the loading beam, it should be ensured that the deflections of the loading beam and the upper wooden block under the maximum load do not exceed 1 / 720 of the length of the concrete pipe, ensuring that the pressure can be evenly distributed on the concrete pipe during the pressure application process, avoiding stress concentration and uneven distribution, and thus improving the accuracy of the detection result.
[0014] The present utility model is further configured as: the pressure and creep detection unit includes a pressure sensor, a string potentiometer, a strain gauge, and a differential transformer displacement sensor. The pressure sensor is installed on the loading beam with its detection end facing the pressure rod. The detection end of the string potentiometer is arranged towards the center area of the concrete pipe of the positioning tooling. The detection ends of the strain gauge and the differential transformer displacement sensor are respectively arranged opposite to the side wall of the concrete pipe of the positioning tooling.
[0015] By adopting the above technical solution, the pressure sensor is used to measure the pressure exerted by the cantilever steel beam on the positioning tooling, thereby indirectly measuring the pressure acting on the concrete pipe. The string potentiometer is used to detect the radial displacement of the concrete pipe to evaluate its creep performance. The strain gauge is used to detect the surface strain of the concrete pipe to further analyze the stress condition of the concrete pipe. The differential transformer displacement sensor is used to measure the change in the crack width of the concrete pipe during the loading process to obtain more accurate creep data. This combination of multiple detection means can comprehensively and accurately evaluate the creep performance of the concrete pipe, providing strong support for the design and use of the concrete pipe.
[0016] The present utility model is further configured as: a plurality of strain gauges are provided and are evenly distributed on the outer circumferential wall of the concrete pipe of the positioning tooling.
[0017] By adopting the above technical solution, it is beneficial to improve the detection efficiency and accuracy.
[0018] The present utility model is further configured such that: a plurality of differential transformer type displacement sensors are provided and are respectively disposed on the top and side portions of the concrete pipe of the positioning tooling.
[0019] By adopting the above technical solution, it is beneficial to improve the detection efficiency and accuracy.
[0020] The present utility model is further configured such that: the jacking driving member, the pressure bar and the counterweight member are arranged in sequence along the direction away from the vertical frame.
[0021] By adopting the above technical solution, it is beneficial to improve the detection efficiency and accuracy.
[0022] The present utility model is further configured such that: the jacking driving member is a hydraulic jack, the jacking driving member is hinged to the bottom frame, and the piston rod is hinged to the second cross beam.
[0023] By adopting the above technical solution, it is beneficial to improve the detection efficiency and accuracy.
[0024] The present utility model is further configured such that: the counterweight member is a plurality of counterweight lead blocks and is suspended on the second cross beam in a linear shape.
[0025] By adopting the above technical solution, it is beneficial to improve the detection efficiency and accuracy.
[0026] In summary, the beneficial technical effects of the present utility model are as follows: the device has the advantages of simple structure, convenient operation, a large range of test piece sizes that can be loaded, and the measurement result is not affected by the deformation of the pressure application structure, etc., and can realize simple, efficient and accurate detection of the creep performance of concrete pipes, providing strong support for the design and use of concrete pipes. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 is a schematic structural diagram of the concrete pipe creep performance detection device of the present utility model.
[0028] Figure 2 is a schematic connection relationship diagram among the cantilever steel beam, the positioning tooling, the jacking driving member and the counterweight member of the present utility model.
[0029] Figure 3 is a schematic connection relationship diagram among the cantilever steel beam, the positioning tooling, the pressure and creep detection unit and the concrete pipe of the present utility model.
[0030] In the figure, 1 is a support steel frame; 11 is a bottom frame; 12 is a vertical frame; 13 is a diagonal brace; 2 is a cantilever steel beam; 21 is a first cross beam; 22 is a second cross beam; 23 is a strut; 3 is a positioning tooling; 31 is a bearing beam; 32 is a lower wooden block; 33 is an upper wooden block; 34 is a loading beam; 4 is a jacking driving member; 5 is a counterweight member; 6 is a pressure and creep detection unit; 61 is a pressure sensor; 62 is a wire potentiometer; 63 is a strain gauge; 64 is a differential transformer displacement sensor. Detailed implementation manners
[0031] In order to make the technical means, creative features, achieved purposes and functions realized by the present utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the accompanying drawings and specific implementation manners.
[0032] Referring to Figure 1 , a concrete pipe creep performance detection device disclosed by the present utility model includes a support steel frame 1, a cantilever steel beam 2 hinged to the support steel frame 1, a positioning tooling 3 arranged below the cantilever steel beam 2 and used for placing a concrete pipe, jacking driving members 4 and counterweight members 5 arranged on both sides of the positioning tooling 3, and a pressure and creep detection unit 6. Among them, the output ends of the jacking driving members 4 and the counterweight members 5 respectively act on the cantilever steel beam 2 to complete the selective pressing of the cantilever steel beam 2 on the positioning tooling 3, the pressure detection end of the pressure and creep detection unit 6 is arranged between the cantilever steel beam 2 and the positioning tooling 3, and the creep detection end is arranged on the concrete pipe of the positioning tooling 3.
[0033] The concrete pipe is pre-installed on the positioning fixture 3 in an axially horizontal manner, with the support steel frame 1 as the support foundation for the entire device to apply force. Its structural design ensures the stability and load-bearing capacity of the device. The cantilever steel beam 2 is hinged on the support steel frame 1, which can not only adjust the angle and position as needed to adapt to concrete pipe specimens of different sizes, but also allow the cantilever beam to deform and rotate during loading, and the measurement results are not affected by the deformation of the pressure structure. During the test, the output shaft of the jacking drive 4 drops, and the cantilever steel beam 2 can achieve long-term loading of the positioning fixture 3 under the influence of its own weight and the gravity of the counterweight 5, so that the positioning fixture 3 can evenly transfer the pressure to the concrete pipe, thereby simulating the stress state of the concrete pipe in the actual working environment. This design can not only realize a comprehensive test of the creep performance of the concrete pipe, but also adjust the applied pressure as needed to simulate different working conditions. During the long-term loading of the positioning fixture 3 by the cantilever steel beam 2, the pressure detection end of the pressure and creep detection unit 6 is used to indirectly measure the pressure acting on the concrete pipe, so as to adjust the output of the jacking drive 4 according to the loading needs, and the creep detection end of the pressure and creep detection unit 6 is used to detect the radial displacement, surface strain and crack width of the concrete pipe to match the relationship between pressure and creep, and the operation is simple and fast. In summary, the device has the advantages of simple structure, convenient operation, a large range of loadable specimen sizes, and the measurement results are not affected by the deformation of the pressure structure. It can realize simple, efficient and accurate detection of the creep performance of concrete pipes, and provides strong support for the design and use of concrete pipes.
[0034] In order to reduce the influence of deformation of the pressure structure on the measurement results, the support steel frame 1 includes a base frame 11, a vertical frame 12 arranged on the base frame 11, and a pair of diagonal braces 13 arranged between the base frame 11 and the vertical frame 12. The cantilever steel beam 2 includes a pair of first cross beams 21 hinged on the vertical frame 12, a plurality of second cross beams 22 arranged between the pair of first cross beams 21, and a pressure rod 23 arranged on one of the second cross beams 22, and the bottom surface of the pressure rod 23 is set as an arc-shaped convex surface. The base frame 11 serves as the supporting foundation of the entire device, ensuring the overall stability of the device, the vertical frame 12 provides a reliable installation position for the cantilever steel beam 2, and the diagonal brace 13 increases the structural strength of the support steel frame 1, further ensuring the bearing capacity of the device; the cantilever steel beam 2 is hinged on the vertical frame 12, and the angle and position can be adjusted as needed to adapt to concrete pipe specimens of different sizes. This design makes the device more flexible and can meet different detection requirements. The reinforcing rib structure composed of the first crossbeam 21 and the second crossbeam 22 increases the structural strength of the cantilever steel beam 2, making it less likely for the cantilever steel beam 2 to deform when subjected to greater pressure, thereby ensuring the accuracy of the test results. It also enables the cantilever steel beam 2 to maintain a stable posture during loading, further improving the stability and reliability of the device.
[0035] Referring to Figure 2 , the positioning tooling 3 includes a bearing beam 31, a lower wooden block 32 arranged on the bearing beam 31, an upper wooden block 33 arranged above the lower wooden block 32, and a loading beam 34 arranged on the upper wooden block 33. Among them, a gap for the lap joint of the concrete pipe is formed between the lower wooden block 32 and the upper wooden block 33, and the moving path of the pressure rod 23 passes through the loading beam 34. There is a flexible contact relationship between the lower wooden block 32, the concrete pipe and the upper wooden block 33. This design allows the concrete pipe to produce a certain deformation when subjected to pressure, so as to better simulate its stress state in the actual working environment; at the same time, since the moving path of the pressure rod 23 passes through the loading beam 34, it should be ensured that the deflection of the loading beam 34 and the upper wooden block 33 under the maximum load does not exceed 1 / 720 of the length of the concrete pipe, ensuring that the pressure can be evenly distributed on the concrete pipe during the pressing process, avoiding stress concentration and uneven distribution, thereby improving the accuracy of the test results.
[0036] The jacking driving member 4, the pressure rod 23 and the counterweight member 5 are arranged in sequence along the direction away from the vertical frame 12. Among them, the jacking driving member 4 is set as a hydraulic jack. The jacking driving member 4 is hinged to the chassis 11 and the piston rod is hinged to the second cross beam 22. The counterweight member 5 is set as a plurality of counterweight lead blocks and is suspended on the second cross beam 22 in a straight line. By adopting the above structure, the magnitude of the pressure applied to the concrete pipe can be flexibly adjusted, and at the same time, the stability and reliability of the pressing structure are ensured. The hydraulic jack as the jacking driving member 4 has the advantages of simple operation and stable force output, and can accurately control the magnitude of the pressure applied to the concrete pipe, so as to accurately detect the creep performance of the concrete pipe. The counterweight member 5 is set as a plurality of counterweight lead blocks, and the counterweight mass can be flexibly adjusted according to the test requirements, so as to change the magnitude of the pressure applied to the concrete pipe, further improving the flexibility and adaptability of the device.
[0037] Referring to Figure 3, the pressure and creep detection unit 6 includes a pressure sensor 61, a wire potentiometer 62, a strain gauge 63, and a differential transformer displacement sensor 64. The pressure sensor 61 is installed on the loading beam 34 with its detection end facing the pressure bar 23. The detection end of the wire potentiometer 62 is arranged towards the center area of the concrete pipe of the positioning tooling 3. A plurality of strain gauges 63 are provided and evenly distributed on the outer wall of the concrete pipe of the positioning tooling 3. A plurality of differential transformer displacement sensors 64 are provided and respectively arranged on the top and side of the concrete pipe of the positioning tooling 3. The pressure sensor 61 is used to measure the pressure exerted by the cantilever steel beam 2 on the positioning tooling 3, thereby indirectly measuring the pressure acting on the concrete pipe; the wire potentiometer 62 can be assisted in installation by a bracket (not shown in the figure) and is used to detect the radial displacement of the concrete pipe to evaluate its creep performance; the strain gauge 63 is used to detect the surface strain of the concrete pipe to further analyze the stress condition of the concrete pipe; and the differential transformer displacement sensor 64 is used to measure the change in the crack width of the concrete pipe during the loading process to obtain more accurate creep data. This way of combining multiple detection means can comprehensively and accurately evaluate the creep performance of the concrete pipe and provide strong support for the design and use of the concrete pipe.
[0038] The implementation principle of this embodiment is as follows:
[0039] S1 Adjust the pressure value of the jacking drive 4 to G*L1 / L2, where G is the total weight of the counterweight, L1 is the distance between the hinged end of the pressure bar 23 and the cantilever steel beam 2, and L2 is the distance between the piston rod of the jacking drive 4 and the pressure bar 23;
[0040] S2 Adjust the hanging length of the counterweight 5 on the cantilever steel beam 2 so that the counterweight 5 is lifted off the ground;
[0041] S3 Adjust the pressure value of the jacking drive 4 again until the measured value of the pressure sensor 61 is 0;
[0042] S4 According to the loading requirements of the creep performance detection, gradually reduce the pressure value of the jacking drive 4 and record the detection data of the pressure and creep detection unit 6.
[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.
Claims
1. A concrete pipe creep performance detection device, characterized in that: The invention comprises a supporting steel frame (1), a cantilever steel beam (2) hinged on the supporting steel frame (1), a positioning fixture (3) arranged below the cantilever steel beam (2) and used for placing a concrete pipe, a jacking drive component (4) and a counterweight component (5) arranged on both sides of the positioning fixture (3), and a pressure and creep detection unit (6), wherein the output ends of the jacking drive component (4) and the counterweight component (5) act on the cantilever steel beam (2) respectively to complete the selective pressure application of the cantilever steel beam (2) on the positioning fixture (3), and the pressure detection end of the pressure and creep detection unit (6) is arranged between the cantilever steel beam (2) and the positioning fixture (3), and the creep detection end is arranged on the concrete pipe of the positioning fixture (3).
2. A concrete pipe creep performance detection device according to claim 1, characterized in that: The supporting steel frame (1) comprises a base frame (11), a vertical frame (12) arranged on the base frame (11), and at least two diagonal braces (13) arranged between the base frame (11) and the vertical frame (12); the cantilever steel beam (2) is hinged to the vertical frame (12).
3. A concrete pipe creep performance detection device according to claim 2, characterized in that: The cantilever steel beam (2) comprises a pair of first cross beams (21) hinged on the stand (12), a plurality of second cross beams (22) arranged between the pair of first cross beams (21), and a compression rod (23) arranged on one of the second cross beams (22), wherein the bottom surface of the compression rod (23) is arranged to be an arc-shaped convex surface.
4. A concrete pipe creep performance detection device according to claim 3, characterized in that: The positioning tool (3) comprises a bearing beam (31), a lower wood (32) arranged on the bearing beam (31), an upper wood (33) arranged above the lower wood (32), and a loading beam (34) arranged on the upper wood (33); a gap for overlapping concrete pipes is formed between the lower wood (32) and the upper wood (33); and a moving path of the compression rod (23) passes through the loading beam (34).
5. A concrete pipe creep performance detection device according to claim 4, characterized in that: The pressure and creep detection unit (6) comprises a pressure sensor (61), a string potentiometer (62), a strain gauge (63), and a differential transformer type displacement sensor (64); the pressure sensor (61) is mounted on the loading beam (34) in a manner such that the detection end faces the pressure rod (23); the detection end of the string potentiometer (62) is arranged toward the center area of the concrete pipe of the positioning fixture (3); and the detection ends of the strain gauge (63) and the differential transformer type displacement sensor (64) are respectively arranged relative to the side wall of the concrete pipe of the positioning fixture (3).
6. A concrete pipe creep performance detection device according to claim 5, characterized in that: The strain gauges (63) are provided in plurality and are evenly distributed on the circumferential outer wall of the concrete pipe of the positioning tool (3).
7. A concrete pipe creep performance detection device according to claim 5, characterized in that: The differential transformer type displacement sensors (64) are provided in plurality and are respectively arranged on the top and side of the concrete pipe of the positioning tool (3).
8. A concrete pipe creep performance detection device according to claim 3, characterized in that: The lifting drive member (4), the pressure rod (23) and the counterweight member (5) are arranged in sequence in a direction away from the stand (12).
9. A concrete pipe creep performance detection device according to claim 8, characterized in that: The lifting drive component (4) is configured as a hydraulic jack; the lifting drive component (4) is hinged to the base frame (11), and the piston rod is hinged to the second crossbeam (22).
10. A concrete pipe creep performance detection device according to claim 8, characterized in that: The counterweight (5) is configured as a plurality of counterweight lead blocks and is suspended on the second crossbeam (22) in a straight line.