Concrete filled steel tube debonding amount testing device
By arranging temperature and displacement sensors in steel-concrete composite tubes, real-time monitoring of temperature and displacement changes is achieved, overcoming the shortcomings of existing technologies in monitoring debonding changes during the hydration heat stage and enabling accurate recording of temperature and debonding amount.
Patent Information
- Application Number
- CN202423284488.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing technologies make it difficult to monitor the temperature and displacement changes of steel-concrete composites in real time during the hydration heat stage, resulting in insufficient research on temperature-induced debonding changes.
Design a test device for the debonding amount of concrete in steel pipe, which includes a foundation component, a temperature sensor and a displacement sensor. By arranging sensors and data acquisition equipment inside and outside the steel pipe, the device can monitor temperature and displacement changes in real time.
It enables real-time temperature and displacement monitoring of steel-concrete composites from pouring to curing completion, acquires temperature-time and displacement-time information, and accurately records the correlation between temperature and debonding during curing.
Smart Images
Figure CN223538294U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steel-concrete composite testing technology, specifically relating to a device for testing the debonding amount of steel-concrete composite. Background Technology
[0002] The statements herein provide only background information related to this invention and do not necessarily constitute prior art.
[0003] Steel-concrete composite begins to debond immediately after pouring, and temperature is one of the important reasons for this debonding. During the heat of hydration stage, the core concrete releases a large amount of heat, resulting in a high internal temperature, while the steel pipe is in contact with the environment and has a lower temperature. This creates a greater temperature difference between the two at the contact surface, leading to stress between them and causing the concrete to debond from the steel pipe.
[0004] Currently, debonding of concrete-steel tubing is mainly measured directly or by feeler gauge. Most measurements of debonding of concrete-steel tubing are conducted after the concrete has been cured or used, with little monitoring of debonding changes during the curing process. For debonding of concrete-steel tubing caused by temperature, most measurements are conducted after the concrete has been cured or used, with little monitoring of debonding caused by the hydration heat temperature of the core concrete after pouring. There are also relatively few studies on the correlation between the hydration heat temperature field and displacement during curing. Utility Model Content
[0005] The purpose of this invention is to provide a test device for the debonding amount of steel-concrete composite, which can realize the debonding amount of steel-concrete composite considering the temperature field and concrete shrinkage during the hydration heat stage. It enables real-time monitoring of the temperature and displacement of the core concrete of the steel-concrete composite from pouring to completion of curing, and can obtain the correlation between temperature and debonding during the curing period.
[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0007] In a first aspect, embodiments of this utility model provide a steel-concrete composite debonding testing device, comprising a base component, a temperature sensor, a displacement sensor, and a data acquisition device; the base component is a steel pipe filled with concrete, the steel pipe has multiple temperature sensors distributed inside, and holes are provided on the side wall of the steel pipe, with displacement sensors installed at the hole locations; the temperature sensor and the displacement sensor are respectively connected to the data acquisition device.
[0008] As a further technical solution, the multiple temperature sensors are fixed on a cross-shaped steel reinforcement frame. The steel reinforcement frame is made of two mutually perpendicular steel bars welded together. The length of the steel bars is equal to the diameter of the steel pipe, and the welding position is at the midpoint of the two steel bars.
[0009] As a further technical solution, the temperature sensor is arranged on the lower surface of the steel reinforcement frame, and thermal insulation material is pasted between the temperature sensor and the steel reinforcement frame.
[0010] As a further technical solution, the multiple temperature sensors are distributed below the welding points of the steel reinforcement frame and at the four equal division points of each steel reinforcement.
[0011] As a further technical solution, after concrete is poured inside the steel pipe, a steel bar equipped with a temperature sensor is inserted into a predetermined position within the concrete.
[0012] As a further technical solution, two holes are provided, which are arranged symmetrically on the left and right, and a displacement sensor is installed at each hole.
[0013] As a further technical solution, the axes of the two displacement sensors coincide with the axes of the two holes.
[0014] As a further technical solution, the displacement sensor is fixed to the side wall of the steel pipe by a magnetic support.
[0015] As a further technical solution, the holes in the steel pipe are sealed before concrete is poured. After the concrete has hardened, the holes are cleaned and displacement sensors are installed.
[0016] As a further technical solution, the bottom of the steel pipe is fixed to a steel plate.
[0017] The beneficial effects of the above-described embodiments of this utility model are as follows:
[0018] The steel-concrete composite debonding test device provided by this utility model can monitor the temperature and displacement of the core concrete of the steel-concrete composite in real time from pouring to completion of curing; at the same time, the temperature-time and displacement-time information can be used to obtain the correlation between temperature and debonding during the curing period.
[0019] The steel-concrete composite debonding test device provided by this utility model involves drilling holes in the outer steel pipe of the steel-concrete composite, filling the holes with material, and cleaning the holes promptly after the concrete hardens. Displacement is monitored in real time using a displacement sensor. Simultaneously, a temperature sensor is placed in the concrete immediately after pouring. Through these two sensors, the shrinkage and temperature of the steel-concrete composite during the curing process are monitored in real time, and the temperature field of the core concrete, the debonding amount, and the correlation between the two can be accurately recorded and judged. Attached Figure Description
[0020] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.
[0021] Figure 1 This is a schematic diagram of the foundation components in the steel-concrete composite debonding test device of this utility model.
[0022] Figure 2 This is a schematic diagram of the arrangement of the displacement sensor of this utility model;
[0023] Figure 3 This is a schematic diagram of the arrangement of the temperature sensor of this utility model.
[0024] The diagram is for illustrative purposes only.
[0025] Among them, 1. Concrete; 2. Steel pipe; 3. Steel plate; 4. Hole; 5. Displacement sensor; 6. Reinforcing bar frame; 7. Temperature sensor. Detailed Implementation
[0026] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0027] Example 1
[0028] In a typical embodiment of this utility model, such as Figure 1-3 As shown, a steel-concrete composite debonding test device is provided, including a base component, a temperature sensor, a displacement sensor, and a data acquisition device; the base component is a steel pipe 2 filled with concrete 1, the steel pipe 2 has multiple temperature sensors 7 distributed inside, the side wall of the steel pipe 2 is provided with holes 4, and displacement sensors 5 are installed at the positions of the holes 4; the temperature sensors 7 and displacement sensors 5 are respectively connected to the data acquisition device.
[0029] Among them, the foundation component is used to conduct the steel pipe concrete push-out test, the temperature sensor 7 is used to measure the temperature change of the core concrete after the foundation component concrete is poured, and the displacement sensor 5 is used to measure the displacement change of the core concrete edge after the foundation component concrete hardens.
[0030] like Figure 3 As shown, the multiple temperature sensors 7 are fixed on a cross-shaped steel frame 6. The steel frame 6 is made of two mutually perpendicular steel bars welded together. The length of the steel bars is equal to the diameter of the steel pipe 2, and the welding position is at the midpoint of the two steel bars.
[0031] In this embodiment, the temperature sensor 7 is arranged on the lower surface of the reinforcing bar frame 6. Insulating material is adhered between the temperature sensor 7 and the reinforcing bar frame 6 to completely isolate the temperature sensor from the frame. The fixing should ensure that the temperature sensor does not move when subjected to force at its end. Furthermore, the multiple temperature sensors 7 are distributed below the welding points of the reinforcing bar frame 6 and at the quarter points of each reinforcing bar. Further, after concrete 1 is poured into the steel pipe 2, the reinforcing bars with the temperature sensors are inserted into predetermined positions within the concrete 1. When the reinforcing bar frame is inserted into the concrete, the edge of the reinforcing bar is precisely located on the inner wall of the steel pipe 2.
[0032] In this embodiment, two holes 4 are provided, symmetrically arranged on the left and right sides. A displacement sensor 5 is installed at each hole 4, and the axes of the two displacement sensors 5 coincide with the axes of the two holes 4. Specifically, the displacement sensor 5 is fixed to the side wall of the steel pipe 2 by a magnetic support. The displacement sensor 5 should be guaranteed not to move during the later curing period. Its sensitivity should not be less than 0.00001mm. The displacement sensor 5 is placed after the concrete has completely hardened.
[0033] Furthermore, the holes on the steel pipe 2 are sealed before concrete pouring. After the concrete has hardened, the holes 4 are cleaned and displacement sensors 5 are installed. The bottom of the steel pipe 2 is fixed to the steel plate 3. Specifically, the bottom of the steel pipe 2 is directly welded to the steel plate 3. When pouring concrete, the concrete is 100mm away from the top of the steel pipe.
[0034] In this embodiment, the steel pipe 2 is drilled before the concrete is poured. The hole 4 is located at the midpoint of the height of the internal concrete to be poured later. The two holes 4 are located on the same horizontal plane, and the centers of the holes 4 are located on the same axis. The diameter of the hole is not greater than 20mm and not less than 10mm. After the hole is drilled, the hole is sealed with glass glue to ensure that the hole is completely sealed and there will be no leakage of grout when the concrete is poured later.
[0035] The method of using the steel-concrete pipe debonding test device provided by this utility model is as follows:
[0036] Before pouring concrete, two holes are drilled vertically in the middle of the steel pipe, one on each side, with the centers of the two holes on the same horizontal plane. The holes are then sealed, and concrete is poured. After the concrete is poured, a steel frame with a temperature sensor attached is inserted into the concrete and positioned correctly, and hydration heat data is collected. After the concrete hardens, the sealed holes are cleaned, and a displacement sensor is placed horizontally on the concrete surface through the hole to collect displacement data. The data acquisition system monitors the temperature and shrinkage displacement of the concrete in real time during curing.
[0037] A temperature-time curve (representing the relationship between the core concrete temperature and time after the concrete is poured) is generated based on the detection data of the temperature sensor, and a displacement-time curve (representing the relationship between the core concrete temperature and edge displacement and time after the concrete hardens) is generated based on the detection data of the displacement sensor.
[0038] Compared to other measuring devices, the steel-concrete debonding test device provided in this embodiment can monitor temperature and debonding amount after the concrete is poured. At the same time, the monitoring is continuous, and the temperature and displacement change trends can be observed, and the correlation between the two can be studied.
[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A device for testing the debonding amount of concrete-filled steel pipes, characterized in that, It includes a basic component, a temperature sensor, a displacement sensor, and a data acquisition device; the basic component is a steel pipe filled with concrete, and multiple temperature sensors are distributed inside the steel pipe. Holes are provided on the side wall of the steel pipe, and displacement sensors are installed at the locations of the holes; the temperature sensor and the displacement sensor are respectively connected to the data acquisition device.
2. The steel-concrete composite debonding test device as described in claim 1, characterized in that, The multiple temperature sensors are fixed on a cross-shaped steel frame, which is made of two perpendicular steel bars welded together. The length of the steel bars is equal to the diameter of the steel pipe, and the welding position is at the midpoint of the two steel bars.
3. The steel-concrete composite debonding test device as described in claim 2, characterized in that, The temperature sensor is arranged on the lower surface of the steel reinforcement frame, and thermal insulation material is pasted between the temperature sensor and the steel reinforcement frame.
4. The steel-concrete composite debonding test device as described in claim 2, characterized in that, The multiple temperature sensors are distributed below the welding points of the steel reinforcement frame and at the quarter points of each steel reinforcement.
5. The steel-concrete composite debonding test device as described in claim 2, characterized in that, After concrete is poured into the steel pipe, a steel bar equipped with a temperature sensor is inserted into the concrete at a predetermined position.
6. The steel-concrete composite debonding test device as described in claim 1, characterized in that, There are two holes, which are symmetrically arranged on the left and right sides, and a displacement sensor is installed at each hole.
7. The steel-concrete composite debonding test device as described in claim 6, characterized in that, The axes of the two displacement sensors coincide with the axes of the two holes.
8. The steel-concrete composite debonding test device as described in claim 7, characterized in that, The displacement sensor is fixed to the side wall of the steel pipe by a magnetic support.
9. The steel-concrete composite debonding test device as described in claim 1, characterized in that, The holes in the steel pipe are sealed before concrete is poured. After the concrete has hardened, the holes are cleaned and displacement sensors are installed.
10. The steel-concrete composite debonding test device as described in claim 1, characterized in that, The bottom of the steel pipe is fixed to the steel plate.