A test device for applying uniformly distributed load to arched steel tube concrete components
By designing a test device consisting of a fixed frame and prestressed steel cables, the problems of large volume, inconvenient movement and long time consumption in load testing of arch components were solved, and uniform load application and accurate testing of arched steel tube concrete components were achieved.
Patent Information
- Application Number
- CN202310181923.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-03-01
- Publication Date
- 2025-09-30
- Estimated Expiration
- 2043-03-01
AI Technical Summary
In the prior art, the experimental device for applying uniformly distributed loads to arched components is large in size and inconvenient to move. The test results are single and time-consuming, making it difficult to accurately detect the performance of the arched components.
A test device consisting of a fixed frame, arched steel plates, connecting steel pipes, prestressed steel cables, and a prestressing mechanism was designed. Different levels of force were applied through the prestressed steel cables to simulate the surrounding rock pressure, and the load capacity was measured using tension sensors and displacement meters.
It achieves uniform load application on arched steel tube concrete components, improves test accuracy and efficiency, simplifies the operation process, and ensures the accuracy of test data.
Smart Images
Figure CN116223215B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of building material testing, and particularly relates to a testing device for applying a uniformly distributed load to an arched steel tube concrete component. Background Art
[0002] Concrete-filled steel tube arch structures are arch ribs composed of concrete-filled steel tubes. They offer high load-bearing capacity, excellent plasticity and toughness, strong fire and impact resistance, easy construction, and excellent cost-effectiveness. Concrete-filled steel tube arch structures are widely used in the support systems of coal mine tunnels. The restraining effect of the steel tube shell places the concrete under triaxial compression, giving the internal concrete greater compressive strength and deformation resistance, thereby significantly improving the structure's load-bearing capacity.
[0003] When applied, it is necessary to conduct a uniformly distributed load test on the arched member to test its performance indicators. The current experimental devices for applying uniformly distributed loads to arched members have the following shortcomings: they are generally large in size, inconvenient to move, the test results of surrounding rock pressure are relatively simple, and the test process of arched members is time-consuming. Summary of the Invention
[0004] The present invention provides a test device for applying a uniformly distributed load to an arched steel tube concrete member, which can apply forces of different sizes through prestressed steel cables to simulate surrounding rock pressures at different levels and test the load resistance of the arched member.
[0005] The technical solutions of the present invention are as follows:
[0006] A test device for applying a uniformly distributed load to an arched steel tube concrete member, consisting of one or more structures, each structure including a fixed frame, an arched steel plate, a connecting steel pipe, a prestressed steel cable and a prestressing mechanism; the arched steel plate is riveted to the arched steel tube concrete member, and multiple arched steel tube concrete members are assembled into an annular assembly through the connecting steel pipe; an external slide is provided on the outer edge of the arched steel plate, the prestressed steel cable is placed in the external slide and wrapped around the annular assembly; the annular assembly is installed in the fixed frame, and two prestressing mechanisms are respectively arranged at the two ends of the bottom frame of the fixed frame, and the two ends of the prestressed steel cable are fixedly connected to the two prestressing mechanisms.
[0007] Furthermore, in the test device for applying a uniformly distributed load to an arched steel tube concrete member, a tension sensor is provided on the prestressed steel cable; a support rod is provided on the top frame of the fixed frame, a displacement meter is provided at the lower end of the support rod, and the displacement meter faces the annular component.
[0008] Furthermore, in the test device for applying a uniformly distributed load to an arched steel tube concrete member, the arched steel plate is divided into an upper half circle and a lower half circle, and an external slide is provided on the outer edge of the upper half circle; the arched steel plate is provided with a plurality of rivet holes, and the outer wall of the arched steel tube concrete member is provided with a plurality of protrusions, and the protrusions are installed in the rivet holes to rivet the arched steel plate to the arched steel tube concrete member.
[0009] Furthermore, in the test device for applying a uniformly distributed load to an arched steel tube concrete member, the outer slide surface is provided with double rows of grooves with a semicircular cross-section, and the prestressed steel cables are placed in the grooves.
[0010] Furthermore, in the test device for applying a uniformly distributed load to an arched steel tube concrete member, the bottom frame of the fixed frame is provided with a lower bracket, and the side frame of the fixed frame is provided with a side bracket, and the lower bracket and the side bracket are used to support and position the annular component.
[0011] Furthermore, in the test device for applying a uniformly distributed load to an arched steel tube concrete member, the arched steel plate is provided with a plurality of circular holes, and the arched steel tube concrete member is provided with a plurality of through holes, and the positions of the circular holes correspond to the positions of the through holes; a plurality of connecting rods are inserted into the circular holes and the through holes to connect the multiple structures in series.
[0012] The beneficial effects of the present invention are as follows: the device structure of the present invention is reasonably designed, and the process operation steps are simple and convenient. The tensile stress is applied to the head and tail ends of the prestressed steel cable by the prestressed steel cable installed on the fixed frame, and the tensile stress is evenly transferred to the outside of the arched steel tube concrete member by the prestressed steel cable, which can effectively ensure that the arched member is subjected to compressive force under the traction of the prestressed steel cable, smoothly apply a uniformly distributed load to the arched steel tube concrete member, and also ensure the accuracy of the test data. The arched steel plate is riveted on the arched steel tube concrete member, and the external slide of the arched steel plate is convenient for setting the prestressed steel cable, which can realize the free movement of the prestressed steel cable on the external slide, so that it can better and more evenly apply a uniformly distributed load to the arched steel tube concrete member, making the test measurement results more accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 Schematic diagram of the test device for applying uniformly distributed load to arched concrete-filled steel tube members;
[0014] Figure 2 This is a schematic diagram of an arched concrete-filled steel tube component;
[0015] Figure 3 Schematic diagram of the arched steel plate;
[0016] Figure 4 It is a schematic diagram of the upper half circle of the arch steel plate;
[0017] Figure 5This is a cross-sectional view of an arched steel plate riveted to an arched concrete-filled steel tube member;
[0018] Figure 6 Schematic diagram of the connection between the prestressing mechanism and the prestressing steel cable. DETAILED DESCRIPTION
[0019] like Figure 1-6 As shown, a test device for applying a uniformly distributed load to an arched steel tube concrete member is composed of two structures, each of which includes a fixed frame 1, an arched steel plate 2, a connecting steel pipe 3, a prestressed steel cable 4 and a prestressing mechanism 5; the arched steel plate 2 is divided into an upper half circle 15 and a lower half circle 16, and an external slide 19 is provided on the outer edge of the upper half circle 15; the arched steel plate 2 is provided with a plurality of rivet holes 17, and the outer wall of the arched steel tube concrete member 12 is provided with a plurality of protrusions 13, and the protrusions 13 are installed in the rivet holes 17 to rivet the arched steel plate 2 to the arched steel tube concrete member 12, and the four arched steel tube concrete members 12 are assembled into an annular assembly through four connecting steel pipes 3; the surface of the external slide 19 is provided with a semicircular section The surface has double rows of grooves. Two prestressed steel cables 4 are placed in the double rows of grooves of the external slideway 19 and wrapped around the annular assembly. The bottom frame of the fixed frame 1 is provided with a lower bracket 8, and the side frame of the fixed frame 1 is provided with a side bracket 9. The annular assembly is installed in the fixed frame 1. The lower bracket 8 and the side bracket 9 are used to support and position the annular assembly. Two prestressing mechanisms 5 are respectively provided at the two ends of the bottom frame of the fixed frame 1. The two ends of the prestressed steel cables 4 are fixedly connected to the two prestressing mechanisms 5. The prestressed steel cables 4 are provided with a tension sensor 6. The top frame of the fixed frame 1 is provided with a support rod 10. The lower end of the support rod 10 is provided with a displacement meter 7. The displacement meter 7 faces the annular assembly. The arched steel plate 2 is provided with multiple circular holes 18, and the arched steel tube concrete component 12 is provided with multiple through holes 14. The circular holes 18 correspond to the positions of the through holes 14. Multiple connecting rods 11 are inserted into the circular holes 18 and through holes 14 to connect the two structures in series. The prestressing mechanism 5 is a jack. The prestressed steel cable 4 applies a uniform load to the arched steel tube concrete component 12. The tension sensor 6 can measure the tension applied by the prestressing mechanism 5 to the prestressed steel cable 4, and the displacement meter 7 can measure the deformation value of the arched steel tube concrete component 12.
Claims
1. A test device for applying a uniformly distributed load to an arched concrete-filled steel tube member, characterized in that: It consists of one or more structures, each structure includes a fixed frame, an arched steel plate, a connecting steel pipe, a prestressed steel cable and a prestressed applying mechanism; the arched steel plate is riveted on the arched steel tube concrete member, and multiple arched steel tube concrete members are assembled into an annular component through the connecting steel pipe; an external slide is provided on the outer edge of the arched steel plate, and the prestressed steel cable is placed in the external slide and wrapped around the annular component; the annular component is installed in the fixed frame, and two prestressed applying mechanisms are respectively arranged at the two ends of the bottom frame of the fixed frame, and the two ends of the prestressed steel cable are fixedly connected to the two prestressed applying mechanisms respectively; the surface of the external slide is provided with a double row of grooves with a semicircular cross-section, and the prestressed steel cable is placed in the grooves.
2. The test device for applying uniformly distributed load to arched concrete-filled steel tube members according to claim 1, characterized in that: A tension sensor is provided on the prestressed steel cable; a support rod is provided on the top frame of the fixed frame, a displacement meter is provided at the lower end of the support rod, and the displacement meter faces the annular component.
3. The test device for applying uniformly distributed load to arched concrete-filled steel tube members according to claim 1, characterized in that: The arched steel plate is divided into an upper half circle and a lower half circle, and an external slide is provided on the outer edge of the upper half circle; the arched steel plate is provided with a plurality of rivet holes, and the outer wall of the arched steel tube concrete component is provided with a plurality of protrusions, and the protrusions are installed in the rivet holes to rivet the arched steel plate to the arched steel tube concrete component.
4. The test device for applying uniformly distributed load to arched concrete-filled steel tube members according to claim 1, characterized in that: The bottom frame of the fixed frame is provided with a lower bracket, and the side frame of the fixed frame is provided with a side bracket. The lower bracket and the side bracket are used to support and position the annular component.
5. The test device for applying uniformly distributed load to arched concrete-filled steel tube members according to claim 1, characterized in that: The arched steel plate is provided with a plurality of circular holes, and the arched steel tube concrete component is provided with a plurality of through holes, and the circular holes correspond to the positions of the through holes; a plurality of connecting rods are inserted into the circular holes and the through holes to connect the multiple structures together in series.