Freeze-thaw cycle-carbonization-fatigue coupling device for concrete interface

Abstract

The utility model belongs to the technical field of concrete interface anti-freezing test equipment, and particularly relates to a concrete interface freeze-thaw cycle-carbonization-fatigue coupling device which comprises a fatigue test structure, and the movable end of the fatigue test structure extends into a freeze-thaw cycle-carbonization environment box; lower supports are symmetrically and fixedly connected to the inner bottom wall of the freezing and thawing cycle-carbonization environment box, a test piece is placed on the lower supports, and the test piece and the fatigue test structure are vertically and correspondingly arranged. A carbonization structure is placed on one side of the top face of the base and communicates with the freezing and thawing cycle-carbonization environment box. A spraying structure is fixedly connected to the top wall in the freeze-thaw cycle-carbonization environment box, and the water outlet end of the spraying structure directly faces the test piece. According to the freeze-thaw cycle-carbonization environment box disclosed by the utility model, gas is used as a refrigerating medium, a gas freezing-gas thawing mode is adopted, and a temperature control device and a fatigue loading structure are arranged, so that the safety performance of a bridge structure can be evaluated under the action of freeze-thaw cycle-carbonization and repeated loading of a component at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of concrete interface freeze-thaw test equipment, and particularly relates to a concrete interface freeze-thaw cycle-carbonation-fatigue coupling device. Background Art

[0002] The freeze-thaw damage of concrete is a relatively complex physical change process. The repeated occurrence of freeze-thaw cycles causes serious damage to bridge structures. And only freezing without melting will also cause frost heave damage, resulting in cracks on the bridge deck. When concrete is exposed to the air for a long time, carbonation and pollution occur on the structure surface, which causes steel corrosion, reducing the reliability and durability of the structure. With the occurrence of cases where buildings (structures) are prematurely damaged due to concrete durability problems in engineering practice, the carbonation of concrete and its influence on steel corrosion have attracted the attention of the engineering community. Plaster falls off in pieces, and in severe cases, the structure can completely lose its bearing capacity and heat preservation performance. Freeze-thaw cycles can cause serious weathering inside the bridge structure and lose its durability.

[0003] Since the freeze-thaw cycle has a great influence on the surface of structural members, it is urgent to provide a freeze-thaw cycle-carbonation-fatigue coupling test device, which can simulate the fatigue effect generated by the repeated action of vehicle loads on the bridge, so as to analyze the use state of the UHPC-NC interface under extreme climate conditions and can truly and comprehensively evaluate the safety performance of the bridge structure. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a concrete interface freeze-thaw cycle-carbonation-fatigue coupling device to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] A concrete interface freeze-thaw cycle-carbonation-fatigue coupling device includes: a base, four corners of the top surface of the base are fixedly connected with support rods, the top ends of the support rods are fixedly connected with the same top plate, a fatigue test structure is arranged on the top plate, the movable end of the fatigue test structure extends into the freeze-thaw cycle-carbonation environment box, the freeze-thaw cycle-carbonation environment box is installed on the base through a reaction frame, lower supports are symmetrically and fixedly connected to the inner bottom wall of the freeze-thaw cycle-carbonation environment box, a test specimen is placed on the lower supports, and the test specimen is vertically corresponding to the fatigue test structure;

[0007] A carbonation structure is placed on one side of the top surface of the base, and the carbonation structure is communicated with the freeze-thaw cycle-carbonation environment box;

[0008] A spraying structure is fixedly connected to the inner top wall of the freeze-thaw cycle-carbonation environment chamber. The water outlet end of the spraying structure faces the test specimen, and the water inlet end of the spraying structure is communicated with a water storage tank, which is placed on the top surface of the base;

[0009] A temperature sensor is placed at the center position of the test specimen. The temperature sensor is electrically connected to a temperature control device, and the temperature control device is located on the top surface of the base.

[0010] Preferably, the fatigue test structure includes a servo motor, which is installed in the middle of the top surface of the top plate. The output end of the servo motor is fixedly connected with a pressure rod, and the other end of the pressure rod is fixedly connected with a pressure head. Two upper supporting seats are symmetrically and fixedly connected to the bottom surface of the pressure head. The test specimen is located between the upper supporting seat and the lower support.

[0011] Preferably, a sealing rubber sleeve is fixedly connected between the middle of the bottom surface of the top plate and the middle of the top surface of the freeze-thaw cycle-carbonation environment chamber, and the sealing rubber sleeve is sleeved outside the pressure rod.

[0012] Preferably, the carbonation structure includes a liquid carbon dioxide storage tank, which is placed on the top surface of the base. The liquid carbon dioxide storage tank is communicated with a mixing and vaporization tank through a connecting pipe. The gas outlet end of the mixing and vaporization tank is communicated with the gas inlet end of a transport pipe, and the gas outlet end of the transport pipe is communicated with a vaporization spray head, which is arranged corresponding to the test specimen.

[0013] Preferably, the spraying structure includes a fixing frame, the outside of which is fixedly connected to the inner top wall of the freeze-thaw cycle-carbonation environment chamber. A spraying pipe is installed inside the fixing frame. A plurality of spray heads are installed at the water outlet end of the spraying pipe, and the plurality of spray heads are evenly arranged at equal intervals and are arranged corresponding to the test specimen;

[0014] The spraying pipe is communicated with the water storage tank through a water pipe.

[0015] Preferably, through holes are formed in the fixing frame, and the size of the through holes is adapted to the size of the water pipe.

[0016] Preferably, a chamber door is rotatably connected to the front end of the freeze-thaw cycle-carbonation environment chamber.

[0017] Compared with the prior art, the utility model has the following advantages and technical effects:

[0018] The freeze-thaw cycle - carbonation environment chamber of the present utility model uses gas as the refrigeration medium and adopts the gas freezing - gas melting method. By setting a temperature control device and a fatigue loading structure, components can be simultaneously subjected to freeze-thaw cycle - carbonation and repeated load effects, and can simulate the operating environment when the temperature difference is large in winter in actual projects and the fatigue effects generated by repeated vehicle loads acting on bridges. Thus, the use state of bridges under extreme climate conditions can be accurately analyzed, and the safety performance of bridge structures can be truly and comprehensively evaluated. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0020] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 It is the front view of the partial structure of the present utility model;

[0022] Figure 3 is Figure 2 the schematic diagram of the partial structure of Figure 1 ;

[0023] Figure 4 is Figure 2 the schematic diagram of the partial structure of Figure 2 ;

[0024] Figure 5 It is the explosion diagram of the spray structure;

[0025] Figure 6 It is the schematic diagram of the test specimen of the utility model;

[0026] Among them, 1. Base; 2. Support rod; 3. Top plate; 4. Fatigue test structure; 5. Freeze-thaw cycle - carbonation environment chamber; 6. Carbonation structure; 7. Spray structure; 8. Carbonation control device; 9. Fatigue control device; 10. Data control device; 11. Test specimen; 12. Lower support; 13. Reaction frame; 401. Servo motor; 402. Sealing rubber sleeve; 403. Pressure rod; 404. Pressure head; 405. Upper top seat; 601. Liquid carbon dioxide storage tank; 602. Connecting pipe; 603. Mixing and vaporizing tank; 604. Transport pipe; 605. Vaporizing nozzle; 701. Water storage tank; 702. Water pipe; 703. Fixed frame; 704. Spray pipe; 705. Spray head; 706. Through hole. Detailed Embodiment

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0028] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Referring to Figures 1 to 6 , the present utility model discloses a freeze-thaw cycle-carbonation-fatigue coupling device for a concrete interface, including: a base 1, support rods 2 are fixedly connected to the four corners of the top surface of the base 1, the top ends of the support rods 2 are fixedly connected to the same top plate 3, a fatigue test structure 4 is provided on the top plate 3, the movable end of the fatigue test structure 4 extends into the freeze-thaw cycle-carbonation environment chamber 5, the freeze-thaw cycle-carbonation environment chamber 5 is installed on the base 1 through a reaction frame 13, lower supports 12 are symmetrically and fixedly connected to the inner bottom wall of the freeze-thaw cycle-carbonation environment chamber 5, a test specimen 11 is placed on the lower supports 12, and the test specimen 11 is vertically arranged corresponding to the fatigue test structure 4;

[0030] A carbonation structure 6 is placed on one side of the top surface of the base 1, and the carbonation structure 6 is communicated with the freeze-thaw cycle-carbonation environment chamber 5;

[0031] A spraying structure 7 is fixedly connected to the inner top wall of the freeze-thaw cycle-carbonation environment chamber 5, the water outlet end of the spraying structure 7 faces the test specimen 11, and the water inlet end of the spraying structure 7 is communicated with a water storage tank 701, and the water storage tank 701 is placed on the top surface of the base 1;

[0032] A temperature sensor is placed at the center position of the test specimen 11, and the temperature sensor is electrically connected to a temperature control device, and the temperature control device is located on the top surface of the base 1.

[0033] The freeze-thaw cycle-carbonation environment chamber 5 of the present utility model uses gas as a refrigeration medium and adopts the method of gas freezing-gas melting. By setting a temperature control device and a fatigue test structure 4, the component can be simultaneously subjected to freeze-thaw cycle-carbonation and repeated load effects, and can simulate the operating environment when the temperature difference is large in winter in actual engineering and the fatigue effect generated by the repeated action of vehicle loads on the bridge, so as to accurately analyze the use state of the bridge under extreme climate conditions and can truly and comprehensively evaluate the safety performance of the bridge structure.

[0034] Further optimized solution, the fatigue test structure 4 includes a servo motor 401, the servo motor 401 is installed in the middle of the top surface of the top plate 3, the output end of the servo motor 401 is fixedly connected with a pressure rod 403, the other end of the pressure rod 403 is fixedly connected with a pressure head 404, and two upper top seats 405 are symmetrically and fixedly connected to the bottom surface of the pressure head 404. The test specimen 11 is located between the upper top seat 405 and the lower support 12.

[0035] Further optimized solution, a sealing rubber sleeve 402 is fixedly connected between the middle of the bottom surface of the top plate 3 and the middle of the top surface of the freeze-thaw cycle-carbonation environment chamber 5, and the sealing rubber sleeve 402 is sleeved outside the pressure rod 403. The sealing rubber sleeve 402 can prevent the internal gas of the freeze-thaw cycle-carbonation environment chamber 5 from leaking.

[0036] Further optimized solution, the carbonation structure 6 includes a liquid carbon dioxide storage tank 601, the liquid carbon dioxide storage tank 601 is placed on the top surface of the base 1, the liquid carbon dioxide storage tank 601 is communicated with a mixing vaporization tank 603 through a connecting pipe 602, the gas outlet end of the mixing vaporization tank 603 is communicated with the inlet end of a transportation pipe 604, and the gas outlet end of the transportation pipe 604 is communicated with a vaporization spray head 605, and the vaporization spray head 605 is arranged corresponding to the test specimen 11.

[0037] The connecting pipe 602 is preferably a high-pressure hose or a metal pipe, and a stop valve is installed on the connecting pipe 602 to control and cut off the liquid flow or gas flow. The connection relationship between the liquid carbon dioxide storage tank 601 and the mixing vaporization tank 603 is prior art. For example, a drain valve is provided at the bottom of the liquid carbon dioxide storage tank 601 to control the outflow of liquid carbon dioxide, and a return air valve is provided at the top of the liquid carbon dioxide storage tank 601 to balance the pressure in the tank and allow part of the gas to return to the tank. The outside of the connecting pipe 602 is wrapped with a heat-insulating layer to reduce the cold loss, prevent frosting on the surface of the pipeline, and improve the vaporization efficiency at the same time. A safety valve is installed on the connecting pipe 602, which serves as an overpressure protection device in the pipeline system. When the system pressure exceeds the set value, it automatically opens to release the excess pressure and prevent accidents. A pressure gauge and a thermometer are installed on the connecting pipe 602 to monitor the pressure and temperature in the pipeline system and ensure that the system operates within a safe range, etc.

[0038] Further optimized solution, the spraying structure 7 includes a fixed frame 703, the outside of the fixed frame 703 is fixedly connected to the inner top wall of the freeze-thaw cycle-carbonation environment chamber 5, a spraying pipe 704 is installed inside the fixed frame 703, a plurality of spray heads 705 are installed at the water outlet end of the spraying pipe 704, the plurality of spray heads 705 are evenly arranged at equal intervals, and the spray heads 705 are arranged corresponding to the test specimen 11;

[0039] The spraying pipe 704 is communicated with a water storage tank 701 through a water pipe 702.

[0040] For a further optimized solution, a through hole 706 is provided on the fixed frame 703, and the size of the through hole 706 is adapted to the size of the water pipe 702.

[0041] For a further optimized solution, a door is rotatably connected to the front end of the freeze-thaw cycle-carbonation environment chamber 5.

[0042] Through the door, the freeze-thaw cycle-carbonation environment chamber 5 can form a sealed space to prevent gas leakage and facilitate the placement or removal of the test specimen 11.

[0043] For a further optimized solution, a deflection collector is provided in the middle of the bottom surface of the test specimen 11, and a displacement and strain gauge is arranged on the side surface of the test specimen 11. The deflection collector and the displacement and strain gauge are electrically connected to the data control device 10, and the data control device 10 is located on one side of the base 1. The deflection collector and the displacement and strain gauge are respectively used to collect the deflection change and displacement change of the test specimen 11 during the loading process and transmit them to the corresponding control device.

[0044] A carbon dioxide sensor is provided on the side wall of the freeze-thaw cycle-carbonation environment chamber 5. The carbon dioxide sensor is used to detect the concentration of carbon dioxide, and the carbon dioxide sensor is electrically connected to the carbonation control device 8.

[0045] The servo motor 401 is electrically connected to the fatigue control device 9. The fatigue control device 9 is located on the base 1. The data control device 10, the fatigue control device 9, the carbonation control device 8, and the temperature control device are electrically connected to the general controller.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0047] The above-described embodiments are only descriptions of the preferred modes of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device, characterized in that: include: A base (1), wherein the four corners of the top surface of the base (1) are fixedly connected to support rods (2), the top ends of the support rods (2) are fixedly connected to the same top plate (3), a fatigue test structure (4) is provided on the top plate (3), the movable end of the fatigue test structure (4) extends into the interior of a freeze-thaw cycle-carbonization environment chamber (5), the freeze-thaw cycle-carbonization environment chamber (5) is mounted on the base (1) via a reaction frame (13), a lower support (12) is symmetrically fixedly connected to the inner bottom wall of the freeze-thaw cycle-carbonization environment chamber (5), a test specimen (11) is placed on the lower support (12), and the test specimen (11) is arranged vertically corresponding to the fatigue test structure (4); A carbonization structure (6) is placed on one side of the top surface of the base (1), and the carbonization structure (6) is connected to the freeze-thaw cycle-carbonization environment box (5); A spray structure (7) is fixedly connected to the top wall of the freeze-thaw cycle-carbonization environment chamber (5), the water outlet of the spray structure (7) faces the test specimen (11), the water inlet of the spray structure (7) is connected to a water storage tank (701), and the water storage tank (701) is placed on the top surface of the base (1); A temperature sensor is placed at the center of the test specimen (11), and the temperature sensor is electrically connected to a temperature control device, which is located on the top surface of the base (1).

2. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device according to claim 1, characterized in that: The fatigue test structure (4) comprises a servo motor (401), wherein the servo motor (401) is mounted on the middle of the top surface of the top plate (3), wherein the output end of the servo motor (401) is fixedly connected to a pressure rod (403), wherein the other end of the pressure rod (403) is fixedly connected to a pressure head (404), wherein the bottom surface of the pressure head (404) is symmetrically fixedly connected to two upper top seats (405), and the test specimen (11) is located between the upper top seat (405) and the lower support (12).

3. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device according to claim 2, characterized in that: A sealing rubber sleeve (402) is fixedly connected between the middle of the bottom surface of the top plate (3) and the middle of the top surface of the freeze-thaw cycle-carbonization environment box (5), and the sealing rubber sleeve (402) is sleeved on the outside of the pressure rod (403).

4. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device according to claim 1, characterized in that: The carbonization structure (6) comprises a liquid carbon dioxide storage tank (601), the liquid carbon dioxide storage tank (601) is placed on the top surface of the base (1), the liquid carbon dioxide storage tank (601) is connected to a mixing vaporization tank (603) via a connecting pipe (602), the gas outlet end of the mixing vaporization tank (603) is connected to the gas inlet end of a transport pipe (604), the gas outlet end of the transport pipe (604) is connected to a vaporization nozzle (605), and the vaporization nozzle (605) is arranged corresponding to the test specimen (11).

5. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device according to claim 1, characterized in that: The spray structure (7) comprises a fixed frame (703), the outer side of the fixed frame (703) is fixedly connected to the inner top wall of the freeze-thaw cycle-carbonization environment box (5), the inner side of the fixed frame (703) is installed with a spray pipe (704), the water outlet end of the spray pipe (704) is installed with a plurality of spray heads (705), the plurality of spray heads (705) are evenly spaced, and the spray heads (705) are arranged corresponding to the test specimens (11); The spray pipe (704) is connected to the water storage tank (701) through a water pipe (702).

6. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device according to claim 5, characterized in that: The fixing frame (703) is provided with a through hole (706), and the size of the through hole (706) is matched with the size of the water pipe (702).

7. A concrete interface freeze-thaw cycle-carbonization-fatigue coupling device according to claim 1, characterized in that: The front end of the freeze-thaw cycle-carbonization environment box (5) is rotatably connected to a box door.

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