Secondary lining concrete fire deterioration simulation device
By designing a two-lined concrete fire deterioration simulation device including a calcining chamber, a temperature controller and a water-cooled tank, the problem of lack of equipment for calculating the compressive strength of concrete after deterioration in the prior art is solved, and accurate simulation and detection of the fire deterioration process of concrete test blocks is achieved, and detection accuracy and adaptability are improved.
Patent Information
- Application Number
- CN202421835438.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The prior art lacks equipment for calculating the compressive strength of concrete after deterioration, making it difficult to accurately detect and evaluate the damage of concrete lining in tunnel fire accidents.
A two-lined concrete fire deterioration simulation device is designed, including a calcining chamber, a thermostat and a water-cooled tank. The calcining chamber is equipped with a heating chamber and a temperature probe to simulate tunnel fire conditions to heat the concrete test block and cool it through the water-cooled tank to finally detect the elastic wave and cube compressive strength of the test block.
The device can simulate tunnel fire conditions, accurately simulate the fire deterioration process of concrete test blocks, provide a reliable test foundation, help detect and evaluate the damage of concrete lining, and improve detection accuracy and adaptability.
Smart Images
Figure CN222927130U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of detection equipment, and particularly relates to a simulation device for the fire deterioration of secondary lining concrete. Background Technique
[0002] Due to the high tightness of tunnels, when dealing with highway tunnel fire accidents, fire fighting and rescue work faces great difficulties, resulting in high fire intensity and long burning time in tunnels, causing serious damage to the lining structure.
[0003] Fire causes varying degrees of damage to tunnel concrete linings, such as surface looseness and chipping. However, traditional rebound methods, ultrasonic methods, and ultrasonic rebound methods have poor adaptability and large errors in post-disaster on-site detection. The rebound method has good test results for homogeneous bodies. For the case where the lining strength after fire is unevenly distributed along the thickness direction and the surface strength is low, the detection effect is poor. The test results of the ultrasonic method are greatly affected by frequency. When measuring tunnel linings, only the flat measurement method can be used, which is inevitably affected by the surface state of concrete and cannot measure the internal strength of concrete. Moreover, it is easily affected by the lining steel bars. The ultrasonic rebound method does not solve the defects of the rebound method and the ultrasonic method and also has poor applicability for on-site detection of post-disaster lining strength. The elastic wave method can not only accurately measure the elastic modulus of concrete but also calculate the compressive strength of concrete, with strong on-site adaptability and high detection accuracy. However, to calculate the compressive strength of concrete, it is first necessary to make concrete test blocks indoors for fire deterioration simulation, and then detect the elastic waves of the concrete test blocks after high-temperature deterioration, so as to calculate the compressive strength of the deteriorated concrete. Based on this, we propose a simulation device for the fire deterioration of secondary lining concrete to complete the above work. Content of the Utility Model
[0004] The purpose of the utility model is to provide a simulation device for the fire deterioration of secondary lining concrete, aiming to solve the technical problem in the above background technique that the existing technology lacks equipment for calculating the compressive strength of deteriorated concrete.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A simulation device for the fire deterioration of secondary lining concrete includes a calcination chamber, a temperature controller, and a water cooling pool. The calcination chamber includes a support layer, a heat insulation layer, and a lining layer arranged in sequence from outside to inside. There is a heating cavity between the lining layer and the heat insulation layer, and heating carbon rods are arranged in the heating cavity. A temperature probe is arranged in the calcination chamber, and the temperature probe and the heating carbon rods are respectively electrically connected to the temperature controller. The water cooling pool is used for water cooling the concrete test blocks after testing in the calcination chamber.
[0007] Furthermore, it also includes an explosion-proof cage for placing concrete test blocks. The explosion-proof cage adopts a box structure, and through holes are evenly arranged on the surface of the explosion-proof cage.
[0008] Further, a limiting mechanism is provided inside the explosion-proof cage. The limiting mechanism includes two groups of chutes arranged in parallel and spaced apart at the bottom inside the explosion-proof cage. A baffle is arranged between the two groups of chutes and is slidably connected to the chutes. Adjacent baffles are used to limit and fix concrete test blocks.
[0009] Further, second threaded holes are uniformly arranged along the length direction on one side of the chute. A connecting plate is provided at the end of the baffle. Corresponding third threaded holes are provided on the connecting plate. The aligned second threaded holes and third threaded holes are fixed by second bolts.
[0010] Further, the water cooling pool includes a cooling tank and a protective cover covering the top of the cooling tank.
[0011] Further, a support plate is provided inside the cooling tank. The support plate is used to place concrete test blocks. An electric telescopic rod is provided inside the cooling tank. The telescopic end of the electric telescopic rod is connected to the bottom surface of the support plate. The electric telescopic rod is used to drive the support plate to move vertically.
[0012] Further, the support plate is uniformly provided with diversion holes.
[0013] Further, the aperture of the through hole is 2 mm.
[0014] Compared with the disadvantages and deficiencies of the prior art, the utility model has the following beneficial effects.
[0015] 1. The utility model provides a secondary lining concrete fire deterioration simulation device, which is respectively provided with a calcination chamber, a temperature controller and a water cooling pool. The calcination chamber is used to simulate tunnel fires to test concrete test blocks. The temperature controller heats the concrete test blocks through heating carbon rods, and at the same time, the temperature inside the calcination chamber is monitored in real time through a temperature probe. After the test, the concrete test blocks are water-cooled by the water cooling pool, and then the elastic wave and cube compressive strength of the concrete specimen are detected according to the specifications. This secondary lining concrete fire deterioration simulation device can simulate tunnel fires and provide a reliable test basis for subsequent tests.
[0016] 2. In this secondary lining concrete fire deterioration simulation device, an explosion-proof cage is provided. The concrete test blocks are placed inside the explosion-proof cage, and then the explosion-proof cage is placed in the calcination chamber, which can avoid the problem that the inner clay brick lining layer is damaged due to the impact when the concrete test blocks explode; the explosion-proof cage is provided with a limiting mechanism, and the concrete test blocks are limited and fixed through the limiting mechanism, which is convenient for the uniform placement of the concrete.
[0017] 3. In this secondary lining concrete fire deterioration simulation device, a support plate is provided inside the cooling tank. After the concrete test blocks are placed on the support plate, the protective cover is covered, and then the concrete test blocks are driven by the electric telescopic rod to move below the liquid level for cooling, which is beneficial to preventing the concrete test blocks from possibly undergoing strong disintegration during water cooling, and the debris from injuring the operators or the water splashes from scalding the operators. Description of the Drawings
[0018] Figure 1 It is a flowchart of a secondary lining concrete fire deterioration simulation device in the present utility model.
[0019] Figure 2 It is a schematic diagram of the internal structure of the calcination chamber in the present utility model.
[0020] Figure 3 It is a schematic diagram of the structure of placing an explosion-proof cage in the calcination chamber in the present utility model.
[0021] Figure 4 It is a schematic diagram of the internal structure of the explosion-proof cage in the present utility model.
[0022] Figure 5 It is a schematic diagram of the structure of setting a limiting mechanism on the explosion-proof cage in the present utility model.
[0023] Figure 6 It is Figure 5 a partial enlarged structural schematic diagram of part A in
[0024] Figure 7 It is a schematic diagram of the structure of the water cooling pool in the present utility model.
[0025] Figure 8 It is a schematic diagram of the structure of setting a support plate in the cooling tank in the present utility model.
[0026] In the figure: 1 - calcination chamber; 2 - temperature controller; 3 - water cooling pool; 4 - heating carbon rod; 5 - temperature probe; 6 - support layer; 7 - heat insulation layer; 8 - inner lining layer; 9 - heating cavity; 10 - explosion-proof cage; 11 - through hole; 12 - first bolt; 13 - first threaded hole; 14 - baffle; 15 - sliding groove; 16 - second threaded hole; 17 - connecting plate; 18 - third threaded hole; 19 - slider; 20 - cooling tank; 21 - protective cover; 22 - support plate; 23 - diversion hole; 24 - electric telescopic rod; 25 - sealing door. Detailed implementation manners
[0027] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0028] Referring to Figure 1 and Figure 2, A secondary lining concrete fire deterioration simulation device, comprising a calcination chamber 1, a temperature controller 2 and a water cooling pool 3. The calcination chamber 1 includes a support layer 6, a heat insulation layer 7 and a lining layer 8 arranged in sequence from outside to inside. The support layer 6 is made of steel plate, which provides an overall support structure from the outside. The heat insulation layer 7 is made of rock wool board, rigid polyurethane board or perlite; the lining layer 8 is made of clay bricks. The internal space of the calcination chamber 1 is used to place and test concrete specimens. The calcination chamber 1 is provided with a sealing door 25 for the concrete specimens to enter and exit the calcination chamber 1.
[0029] Above and below the internal space of the calcination chamber 1, heating cavities 9 are respectively provided. The heating cavities 9 are located between the heat insulation layer 7 and the lining layer 8. Heating carbon rods 4 are evenly arranged in the heating cavities 9. The heating carbon rods 4 are electrically connected to the temperature controller 2. The temperature controller 2 is used to regulate the heating temperature of the heating carbon rods 4. A temperature probe 5 is arranged in the internal space of the calcination chamber 1. The temperature probe 5 is electrically connected to the temperature controller 2. The temperature probe 5 is used to monitor the temperature of the internal space in real time, so as to dynamically control the temperature in the high-temperature calcination chamber 1 through the temperature controller 2.
[0030] The temperature controller 2 can manually input a piecewise function, including a temperature increase curve and a constant temperature duration. The temperature increase curve is obtained from actual measurements at a certain fire site, and the constant temperature duration is the average combustion duration of a tunnel fire. Through real-time monitoring and feedback by the temperature probe 5, this secondary lining concrete fire deterioration simulation device can truly simulate a tunnel fire, providing a reliable experimental basis for subsequent tests. The heating and temperature increase rate of the heating carbon rods 4 can infinitely approach the temperature increase rate of 5°C per second of the concrete secondary lining in an actual fire, which is beneficial to further improving the practicality of this simulation device.
[0031] Refer to Figure 7 , The water cooling pool 3 is used to simulate the on-site water gun fire extinguishing operation. The water cooling pool 3 includes a cooling tank 20 and a protective cover 21. A certain amount of water is filled in the cooling tank 20 for cooling the concrete specimens. The protective cover 21 is arranged on the top of the cooling tank 20 to block the possible strong disintegration of the concrete specimens during the cooling process, and prevent the debris from injuring the operator or the water splash from scalding the operator.
[0032] In one embodiment, refer to Figure 3 , This secondary lining concrete fire deterioration simulation device further includes an explosion-proof cage 10. The explosion-proof cage 10 is made of a high-temperature resistant alloy plate. The concrete specimens are placed in the explosion-proof cage 10, and then the explosion-proof cage 10 is placed into the calcination chamber 1. During the process of heating the concrete specimens, when the concrete specimens explode, the explosion-proof cage 10 can effectively block the flying concrete fragments. The explosion-proof cage 10 adopts a box structure and can hold multiple concrete specimens at the same time. Through holes 11 are evenly arranged on the surface of the explosion-proof cage 10 to facilitate heat transfer and evaporation of water vapor. The aperture of the through holes 11 is 2 mm.
[0033] In one embodiment, refer to Figures 4 - 6, one side of the explosion-proof cage 10 is provided with an opening for taking and placing concrete test blocks. A first threaded hole 13 is provided at the opening, and the side wall provided at the opening can be fixed to the opening through a first bolt 12. A limiting mechanism is arranged inside the explosion-proof cage 10. The limiting mechanism is used to limit each concrete test block to facilitate the uniform placement of the concrete test blocks inside the explosion-proof cage 10. The limiting mechanism includes sliding grooves 15 arranged on the inner bottom surface of the explosion-proof cage 10. Two groups of sliding grooves 15 are arranged in parallel at intervals. On one side of each group of sliding grooves 15, second threaded holes 16 are evenly arranged along the length direction of the sliding grooves 15. A baffle 14 is arranged between the two side sliding grooves 15. The bottom of the baffle 14 is provided with a slider 19. The slider 19 is slidably connected with the sliding groove 15. The end of the baffle 14 is provided with a connecting plate 17. The connecting plate 17 is correspondingly provided with a third threaded hole 18. The aligned third threaded hole 18 and the second threaded hole 16 are fixed through a second bolt. Multiple groups of baffles 14 are arranged between the two side sliding grooves 15. The adjacent baffles 14 cooperate to limit and fix the concrete test blocks.
[0034] In one embodiment, referring to Figure 8 , a support plate 22 is arranged inside the cooling tank 20. The support plate 22 is horizontally placed. The support plate 22 is used to support the concrete test blocks. An electric telescopic rod 24 is arranged inside the cooling tank 20. The top of the electric telescopic rod 24 is connected to the bottom of the support plate 22. The electric telescopic rod 24 is used to drive the support plate 22 to move vertically. Before cooling, the concrete test blocks are first placed on the support plate 22. The support plate 22 is located above the liquid level inside the cooling tank 20. After covering the protective cover 21 on the cooling tank 20, the electric telescopic rod 24 is used to drive the support plate 22 to move, so as to drive the concrete test blocks to move below the liquid level, thereby achieving the purpose of cooling the concrete test blocks.
[0035] In one embodiment, the support plate 22 is provided with diversion holes 23. The diversion holes 23 are used for water flow to pass through, so as to reduce the resistance during the vertical movement of the support plate 22.
[0036] When the secondary lining concrete fire deterioration simulation device is used, first, adjust the distance between adjacent baffles 14 inside the explosion-proof cage 10, then put the concrete test blocks to be measured into the explosion-proof cage 10, then put the explosion-proof cage 10 into the calcination chamber 1, turn on the temperature controller 2 and input the segmented heating curve parameters, control the heating carbon rod 4 to continuously heat through the temperature controller 2. At the same time, the temperature probe 5 monitors the temperature inside the calcination chamber 1 in real time. After the test is completed, take out the explosion-proof cage 10, take out the concrete specimen from the explosion-proof cage 10 and put it on the support plate 22, cover the protective cover 21, drive the support plate 22 to move vertically through the electric telescopic rod 24, drive the concrete test blocks to move below the liquid level inside the cooling tank 20, and finally detect the elastic wave and cube compressive strength of the concrete specimen according to the specifications.
[0037] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A secondary lining concrete fire degradation simulation device, characterized in that: The invention comprises a calcining chamber (1), a temperature controller (2) and a water cooling pool (3), wherein the calcining chamber (1) comprises a supporting layer (6), a thermal insulation layer (7) and an inner lining layer (8) which are arranged in sequence from the outside to the inside, a heating chamber (9) is arranged between the inner lining layer (8) and the thermal insulation layer (7), a heating carbon rod (4) is arranged in the heating chamber (9), a temperature probe (5) is arranged in the calcining chamber (1), and the temperature probe (5) and the heating carbon rod (4) are respectively electrically connected to the temperature controller (2), and the water cooling pool (3) is used for water cooling a concrete test block after being tested in the calcining chamber (1).
2. The secondary lining concrete fire degradation simulation device according to claim 1, characterized in that: Also included is an explosion-proof cage (10) for placing concrete test blocks, wherein the explosion-proof cage (10) adopts a box structure, and through holes (11) are evenly distributed on the surface of the explosion-proof cage (10).
3. The secondary lining concrete fire degradation simulation device according to claim 2, characterized in that: A limiting mechanism is provided in the explosion-proof cage (10), the limiting mechanism comprising two groups of slide grooves (15) arranged in parallel and at intervals at the bottom of the explosion-proof cage (10), a baffle (14) slidably connected to the slide grooves (15) is provided between the two groups of slide grooves (15), and adjacent baffles (14) are used to limit and fix concrete test blocks.
4. The secondary lining concrete fire degradation simulation device according to claim 3, characterized in that: Second threaded holes (16) are evenly arranged on one side of the slide groove (15) along its length direction, a connecting plate (17) is arranged at the end of the baffle plate (14), and the connecting plate (17) is correspondingly provided with third threaded holes (18), and the aligned second threaded holes (16) and the third threaded holes (18) are fixed by a second bolt.
5. The secondary lining concrete fire degradation simulation device according to claim 1, characterized in that: The water cooling pool (3) comprises a cooling trough (20) and a protective cover (21) arranged on the top of the cooling trough (20).
6. The secondary lining concrete fire degradation simulation device according to claim 5, characterized in that: A support plate (22) is provided in the cooling trough (20), and the support plate (22) is used to place a concrete test block. An electric telescopic rod (24) is provided in the cooling trough (20), and the telescopic end of the electric telescopic rod (24) is connected to the bottom surface of the support plate (22). The electric telescopic rod (24) is used to drive the support plate (22) to move vertically.
7. The secondary lining concrete fire degradation simulation device according to claim 6, characterized in that: The support plate (22) is evenly provided with flow guide holes (23).
8. The secondary lining concrete fire degradation simulation device according to claim 2, characterized in that: The through hole (11) has a diameter of 2 mm.