Concrete durability testing device and method for simulating water pressure and vibration coexistence environment

Abstract

The present invention discloses a concrete durability testing device and method for simulating an environment in which water pressure and vibration coexist. The device comprises a high-pressure aqueous solution supply device, an environmental simulation container, a vibration device, and a data receiving device. The high-pressure aqueous solution supply device has a liquid outlet, which is sealed and connected to the inner cavity of the environmental simulation container. The environmental simulation container is fixed to the vibration device. A concrete test block is installed in the inner cavity of the environmental simulation container. Multiple sensors are embedded in the concrete test block, and each of the multiple sensors is connected to the data receiving device. The concrete test block has a permeable surface, and the multiple sensors are arranged at different depths perpendicular to the permeable surface. The sensors include at least a humidity sensor and a vibration sensor. This device fills a gap in the existing technology and can provide equipment support for conducting concrete durability testing research under the coupled effects of high water pressure and vibration.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering, and in particular relates to a concrete durability test device and method for simulating a water pressure and vibration coexistence environment. Background Art

[0002] With the rapid development of my country's economy, the total number and total length of tunnels involved in rail transit projects and highway projects have increased rapidly. By the end of 2017, there were 14,547 railway tunnels in operation in China with a total length of 15,326 kilometers, and 16,229 highway tunnels with a total length of 15,285.1 kilometers. The investment in tunnel construction is still increasing. Tunnel projects are mainly based on reinforced concrete structures. They are generally covered by strata and surrounding rocks. They are highly concealed and easily affected by various deterioration factors, such as stratum changes, earthquakes, fires, water seepage, etc., and are difficult to repair and reinforce after damage occurs. Among them, the impact of groundwater on tunnel lining structure cannot be ignored. Groundwater is usually rich in Cl - and SO4 2- These harmful ions can enter the concrete through the pore structure and surface cracks, causing a series of physical and chemical changes, resulting in adverse consequences such as steel corrosion and concrete cracking, posing a serious threat to the safe operation of the tunnel and making the actual service life of the tunnel lining structure far lower than the design life. Therefore, the durability of the tunnel should be given sufficient attention.

[0003] Tunnel linings operate in environments significantly different from those of aboveground structures. Tunnels typically traverse strata, mountains, or oceans, potentially exposing them to long-term groundwater contact. Some tunnels are located in strata with high groundwater heads, traverse mountains with well-developed surrounding rock fractures and abundant rainfall, or are submerged in deep-sea environments. Consequently, the durability of these linings is impacted by high water pressure. It is widely agreed that high water pressure accelerates the penetration of harmful ions into the concrete, accelerating the degradation of the reinforced concrete lining. Furthermore, vehicle vibration within railway and highway tunnels is characterized by its long-lasting and periodic nature, which can also induce vibrations in the tunnel lining, a process that persists throughout the tunnel's service life. Studying the durability of tunnel lining concrete structures under the coupled effects of high water pressure and vibration is of practical significance and offers valuable engineering insights. However, research is limited by a lack of testing equipment. Therefore, the development of a test device capable of simulating the coupled effects of high water pressure and vibration is crucial. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a concrete durability testing device and method that simulates an environment in which water pressure and vibration coexist. The concrete durability testing device that simulates an environment in which water pressure and vibration coexist fills the gap in the prior art, can simulate an environment in which high water pressure and vibration are coupled, and can carry out concrete durability tests under the corresponding environment, thereby providing equipment support for conducting concrete durability test research under an environment in which high water pressure and vibration are coupled.

[0005] In order to achieve the purpose, the present invention adopts the following technical solutions:

[0006] A concrete durability testing device for simulating an environment in which water pressure and vibration coexist, comprising a high-pressure aqueous solution supply device, an environmental simulation container, a vibration device, and a data receiving device, wherein the high-pressure aqueous solution supply device has a liquid outlet, which is sealed and connected to the inner cavity of the environmental simulation container, and the environmental simulation container is fixed to the vibration device; a concrete test block is installed in the inner cavity of the environmental simulation container, and a plurality of sensors are embedded in the concrete test block, and the plurality of sensors are all connected to the data receiving device; wherein the concrete test block has a permeable surface, and the plurality of sensors are arranged at different depths perpendicular to the permeable surface, and the sensors include at least a humidity sensor and a vibration sensor.

[0007] Preferably, the environmental simulation container includes a container tube and a sealing cover sealed to the opening of the container tube, and the container tube is provided with a first pressure gauge, a liquid injection valve and an overflow valve; wherein the overflow valve is located on the top of the container tube, the liquid outlet is connected to the inner cavity of the container tube through the liquid injection valve, and the concrete test block is installed in the inner cavity of the container tube.

[0008] Preferably, the aforementioned concrete durability testing device simulating a water pressure and vibration coexistence environment further comprises a connecting pipe provided with a flow meter and a water shut-off valve, one end of the connecting pipe being connected to the injection valve and the other end being connected to the liquid outlet.

[0009] Preferably, a visual window is further provided on the top of the container tube.

[0010] Preferably, a drain valve is provided on the sealing cover and / or the container barrel.

[0011] Preferably, the vibration device includes a supporting platform, a vibration motor, a vibration feedback sensor and a vibration controller. The environmental simulation container, the vibration motor and the vibration feedback sensor are all installed on the supporting platform, and the vibration controller is connected to the vibration feedback sensor and the vibration motor respectively.

[0012] Preferably, the support platform includes a container mounting plate, a base plate and a plurality of elastic connectors, there is a gap between the container mounting plate and the base plate, and the container mounting plate and the base plate are connected by a plurality of elastic connectors, wherein the environmental simulation container is mounted on the top of the container mounting plate, the vibration feedback sensor is arranged on the container mounting plate, and the vibration motor is mounted on the bottom of the container mounting plate.

[0013] Preferably, the high-pressure aqueous solution supply device includes a booster pump, which is provided with a pressure regulating valve, a second pressure gauge, the liquid outlet and a liquid inlet for the water supply solution to enter the booster pump, wherein the booster pump is used to pressurize the aqueous solution entering the interior thereof and pump the pressurized aqueous solution into the inner cavity of the environmental simulation container.

[0014] Preferably, the aforementioned concrete durability testing device for simulating the coexistence of water pressure and vibration also includes an upper plywood and a lower plywood, the concrete test block is installed between the upper plywood and the lower plywood and forms a whole with the upper plywood and the lower plywood, the upper plywood and / or the lower plywood are fixed in the inner cavity of the environmental simulation container, wherein an opening is provided on the upper plywood or the lower plywood, the opening is arranged opposite to the permeable surface, and the area of ​​the opening is smaller than the area of ​​the permeable surface.

[0015] Correspondingly, the present invention further provides a concrete durability test method for simulating a water pressure and vibration coexistence environment, which is applied to the aforementioned concrete durability test device for simulating a water pressure and vibration coexistence environment. The method comprises:

[0016] pouring concrete into the mold to produce the concrete test block;

[0017] Before the initial setting of the concrete, one of the outer surfaces of the concrete test block is selected as the permeable surface, and a plurality of sensors are pre-embedded in the concrete test block at different depths perpendicular to the permeable surface, wherein the sensors include at least a humidity sensor and a vibration sensor;

[0018] Curing the concrete test block pre-embedded with the plurality of sensors, and after the concrete test block has been cured to a specified age, sealing the remaining outer surfaces of the concrete test block except the permeable surface;

[0019] Installing the sealed concrete test block in the inner cavity of the environmental simulation container so that the permeable surface is exposed to the inner cavity of the environmental simulation container, and connecting the plurality of sensors to the data receiving device;

[0020] Taking the state when each outer surface of the concrete test block is in a dry state as the initial state, and recording the sensor data received by the data receiving device at this time as the initial value, wherein the sensor data at least includes humidity data;

[0021] Turning on the high-pressure aqueous solution supply device, which injects an aqueous solution with a specified pressure into the inner cavity of the environmental simulation container through the liquid outlet until the aqueous solution fills the environmental simulation container, and then turning off the high-pressure aqueous solution supply device, so that the concrete test block is in a high-pressure simulated environment;

[0022] Turning on the vibration device to simulate a vibration environment and ensuring that the vibration state of the vibration device meets the test requirements, so that the concrete test block is in a simulated environment of high water pressure and vibration coupling;

[0023] The vibration state of the concrete test block is monitored in real time by the data receiving device, and the humidity data changes of the concrete test block at different depths perpendicular to the penetration surface are recorded, thereby obtaining the penetration rate of the aqueous solution in the concrete test block.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The concrete durability testing device proposed in the present invention simulates an environment in which water pressure and vibration coexist. By installing a concrete test block pre-embedded with multiple sensors in an environmental simulation container, and using a high-pressure aqueous solution supply device to inject an aqueous solution with a specified pressure into the environmental simulation container, the concrete test block to be tested can be continuously in a high-water-pressure simulated environment. At the same time, the environmental simulation container is vibrated by a vibration device, thereby simulating the concrete test block in an environment in which high water pressure and vibration are coupled. This provides equipment support for conducting concrete durability test research in an environment in which high water pressure and vibration are coupled. Moreover, the sensors pre-embedded in the concrete test block can output the sensor data collected during the test to a data receiving device in real time for reference and use by test personnel, thereby providing scientific data for test personnel to study the durability of concrete in an environment in which high water pressure and vibration are coupled.

[0026] The concrete durability test method proposed in the present invention can effectively simulate the actual service environment faced by lined tunnel structures through the above-mentioned concrete durability test device that simulates the coexistence of water pressure and vibration, and provide scientific data for test personnel to study the durability of concrete test blocks in an environment of high water pressure and vibration coupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the overall structure of a concrete durability testing device for simulating a coexisting environment of water pressure and vibration according to one embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the assembly between the high-pressure aqueous solution supply device and the connecting pipe in one embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the assembly between the environmental simulation container and the concrete test block in one embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the installation of a concrete test block in one embodiment of the present invention;

[0032] Figure 5 Schematic diagram of the structure of a vibration device in one embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1-High-pressure aqueous solution supply device, 11-Booster pump, 111-Liquid outlet, 112-Liquid inlet, 12-Second pressure gauge, 13-Pressure regulating valve; 2-Environmental simulation container, 21-Container barrel, 22-Sealing cover, 221-Sealing bolt, 23-First pressure gauge, 24-Injection valve, 25-Overflow valve, 26-Drain valve, 27-Visual window; 3-Vibration device, 31-Support platform, 311-Container mounting plate, 3111-Mounting hole, 312-base plate, 313-elastic connector, 32-vibration motor, 33-vibration feedback sensor, 34-vibration controller; 4-concrete test block, 5-data receiving device, 6-transmission line, 7-connecting pipe, 71-flow meter, 72-water shut-off valve, 73-liquid injection pipe, 74-hose, 81-container support, 82-support base plate, 83-base plate bolt, 91-upper splint, 911-opening, 92-lower splint, 93-fastening screw. DETAILED DESCRIPTION

[0035] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Reference Figure 1 and Figure 3 An embodiment of the present invention provides a concrete durability testing device for simulating an environment in which water pressure and vibration coexist, comprising a high-pressure aqueous solution supply device 1, an environmental simulation container 2, a vibration device 3, and a data receiving device 5. The high-pressure aqueous solution supply device 1 has a liquid outlet 111, which is sealed and connected to the inner cavity of the environmental simulation container 2, and the environmental simulation container 2 is fixed on the vibration device 3; a concrete test block 4 is installed in the inner cavity of the environmental simulation container 2, and a plurality of sensors (not shown in the figure) are buried in the concrete test block 4, and the plurality of sensors are all connected to the data receiving device 5; wherein the concrete test block 4 has a permeable surface (not shown in the figure), and the plurality of sensors are arranged at different depths perpendicular to the permeable surface, and the sensors include at least a humidity sensor and a vibration sensor. In some specific embodiments, at least one humidity sensor and at least one vibration sensor can be respectively arranged at each depth position along the direction perpendicular to the permeable surface (for example, one humidity sensor and one vibration sensor can be arranged at each depth position).

[0038] It should be noted that the "permeable surface" refers to the outer surface of the concrete test block 4 that is exposed to the aqueous solution when the concrete test block 4 is immersed in the aqueous solution from the high-pressure aqueous solution supply device 1. For example, if the concrete test block 4 is generally a cube, one of its six outer surfaces can be selected as the permeable surface. The remaining five surfaces are sealed by evenly applying paraffin wax, etc., so that during the test, only the permeable surface is exposed to the aqueous solution, while the remaining surfaces are isolated from the aqueous solution. Therefore, the aqueous solution can only penetrate into the interior of the concrete test block 4 through the permeable surface. The number of concrete test blocks 4 pre-embedded with sensors can be one or more, and can be flexibly determined based on the volume of the environmental simulation container 2 and the actual test requirements. For example, the number of concrete test blocks 4 used for the test is two. The type of sensor can be flexibly selected based on the actual test requirements. Since the embodiment of the present invention primarily analyzes the durability of the concrete test block 4 by studying the vibration and humidity changes at different depths perpendicular to the permeable surface under high water pressure and vibration coupling, the main types of sensors are humidity sensors and vibration sensors. The sensor and data receiving device 5 can be connected via a wired (e.g., data cable) or wireless (e.g., Bluetooth) communication. For example, the output of each sensor is connected to the input of the data receiving device 5 via a transmission line 6. To extend the service life of the transmission line 6, the surface layer of the transmission line 6 should be made of a corrosion-resistant material. In some specific embodiments, the data receiving device 5 may include a display screen, which primarily receives and displays data transmitted by the sensor, such as humidity data.

[0039] In this embodiment, the process of conducting a concrete durability test under a high water pressure and vibration coupling environment using the concrete durability test device simulating a water pressure and vibration coexistence environment is as follows:

[0040] First, the entire equipment is installed. Specifically, the vibration device 3 and the high-pressure aqueous solution supply device 1 are fixedly installed on the equipment foundation (such as a test bench), the environmental simulation container 2 is fixedly installed on the vibration device 3, the concrete test block 4 with multiple sensors embedded in it is installed in the inner cavity of the environmental simulation container 2, the output ends of the multiple sensors are connected to the data receiver through the transmission line 6, and the liquid outlet 111 of the high-pressure aqueous solution supply device 1 is connected to the environmental simulation container 2.

[0041] During the test, the high-pressure aqueous solution supply device 1 is turned on, and the high-pressure aqueous solution supply device 1 injects an aqueous solution with a specified pressure (the pressure is determined according to the test requirements) into the inner cavity of the environmental simulation container 2. When the environmental simulation container 2 is filled with the aqueous solution, the high-pressure aqueous solution supply device 1 is turned off, and at the same time, it is ensured that the environmental simulation container 2 is in a sealed state; then, the vibration device 3 is turned on to vibrate the environmental simulation container 2, and it is ensured that the vibration state of the environmental simulation container 2 meets the vibration state required by the test, so that the concrete test block 4 can be in a high water pressure and vibration coupling environment, wherein the sensor embedded in the concrete test block 4 can output the sensor data collected during the entire test process to the data receiving device 5 in real time for display.

[0042] In this embodiment, the concrete durability testing device for simulating the coexistence of water pressure and vibration, by installing a concrete test block 4 pre-embedded with multiple sensors in an environmental simulation container 2, and using a high-pressure aqueous solution supply device 1 to inject an aqueous solution with a specified pressure into the environmental simulation container 2, so that the concrete test block 4 to be tested can be continuously in a high water pressure simulated environment, and at the same time, the environmental simulation container 2 is vibrated by a vibration device 3, thereby realizing the simulation of the concrete test block 4 in an environment of high water pressure and vibration coupling, providing equipment support for conducting concrete durability test research in an environment of high water pressure and vibration coupling; moreover, the sensors pre-embedded in the concrete test block 4 can output the sensor data collected during the test to the data receiving device 5 in real time for reference and use by test personnel, thereby providing scientific data for test personnel to study the durability problem of the concrete test block 4 in an environment of high water pressure and vibration coupling.

[0043] Reference Figure 1 and Figure 3 In an optional embodiment, the environmental simulation container 2 includes a container tube 21 and a sealing cover sealed to the opening of the container tube 21. The container tube 21 is provided with a first pressure gauge 23, a liquid injection valve 24 and an overflow valve 25; wherein the overflow valve 25 is located on the top of the container tube 21, the liquid outlet 111 is connected to the inner cavity of the container tube 21 through the liquid injection valve 24, and the concrete test block 4 is installed in the inner cavity of the container tube 21.

[0044] In this embodiment, the container barrel 21 and the sealing cover can be made of stainless steel and the inner surface in contact with the solution should be treated with anti-corrosion to avoid rust damage; the sealing cover and the container barrel 21 can be fastened together by the sealing bolts 221. After removing the sealing bolts 221, the sealing cover can be completely separated from the container barrel 21. At this time, one end of the container barrel 21 can be completely opened. At this time, the concrete test block 4 can be placed in the container barrel 21 for installation and fixation. At the same time, in order to ensure the sealing of the environmental simulation container 2, a sealing ring should be provided at the interface between the sealing cover and the container barrel 21. For example, the first pressure gauge 23 is located on the top of the container barrel 21, and the first pressure gauge 23 can be used to measure the pressure in real time. The pressure of the solution in the container barrel 21 is measured; the injection valve 24 and the overflow valve 25 can be opened and closed, wherein the overflow valve 25 has two functions: on the one hand, it is opened during the injection of the aqueous solution to allow the air inside and outside the container barrel 21 to communicate, ensuring smooth injection of the solution; on the other hand, it can indicate whether the solution is full of the container. When the solution overflows the mouth of the overflow valve 25, it means that the container barrel 21 is full of solution, and it also indicates that the concrete test block 4 in the container barrel 21 has been completely immersed in the aqueous solution. At this time, the overflow valve 25 and the injection valve 24 can be closed to ensure the sealing of the environmental simulation container 2, so that the concrete test block 4 can be continuously in a high water pressure simulation environment.

[0045] Reference Figure 1 and Figure 2 In an optional embodiment, the aforementioned concrete durability test device for simulating a coexisting water pressure and vibration environment further includes a connecting pipe 7, which is provided with a flowmeter 71 and a shutoff valve 72. One end of the connecting pipe 7 is connected to the injection valve 24, and the other end is connected to the liquid outlet 111. Exemplarily, the connecting pipe 7 includes an injection pipe 73 and a hose 74. One end of the injection pipe 73 is connected to the injection valve 24, and the other end is connected to the liquid outlet 111 via the hose 74. The flowmeter 71 is provided on the injection pipe 73, and the shutoff valve 72 is provided on the end of the hose 74 connected to the injection pipe 73.

[0046] In this embodiment, the high-pressure aqueous solution supply device 1 can be conveniently connected to the environmental simulation container 2 by setting a connecting pipe 7. At the same time, the flow rate of the aqueous solution injected into the environmental simulation container 2 can be conveniently adjusted by using the water shut-off valve 72 in conjunction with the flow meter 71.

[0047] Reference Figure 1 In an optional embodiment, a visual window 27 is further provided on the top of the container tube 21, wherein the visual window 27 can be made of transparent organic glass. In this way, by providing the visual window 27, the condition of the concrete test block 4 in the environmental simulation container 2 can be conveniently checked during the test, such as the degree of damage of the test block, the fixing status of the test block, etc.

[0048] Reference Figure 1In an optional embodiment, a drain valve 26 is provided on the sealing cover and / or the container barrel 21. Exemplarily, the drain valve 26 is provided on the lower portion of the sealing cover.

[0049] In this embodiment, the drain valve 26 can be opened and closed. During the test, closing the drain valve 26 can ensure the sealing of the environment simulation container 2. After the environment simulation container 2 is depressurized, opening the drain valve 26 can discharge the solution.

[0050] Reference Figure 1 and Figure 5 In an optional embodiment, the vibration device 3 includes a supporting platform 31, a vibration motor 32, a vibration feedback sensor 33 and a vibration controller 34. The environmental simulation container 2, the vibration motor 32 and the vibration feedback sensor 33 are all installed on the supporting platform 31. The vibration controller 34 is respectively connected to the vibration feedback sensor 33 and the vibration motor 32. Exemplarily, the vibration controller 34 is electrically connected to the vibration feedback sensor 33 and the vibration motor 32 through wires.

[0051] In this embodiment, the vibration motor 32 contains an eccentric rotor, so when it is working, it can cause the support platform 31 to vibrate and transmit the vibration to the environmental simulation container 2, realizing the simulation of the vibration environment, so that the concrete test block 4 can be in an environment of high water pressure and vibration coupling. Specifically, during the test, the vibration feedback sensor 33 obtains the current vibration state (such as amplitude, frequency, etc.) of the support platform 31 in real time and feeds it back to the vibration controller 34. The vibration controller 34 compares the received current vibration state with the preset test vibration state, and adaptively adjusts the working state of the vibration motor 32 step by step according to the comparison result, so that the current vibration state of the support platform 31 is consistent with the preset test vibration state, so that the actual vibration state of the environmental simulation container 2 can gradually reach the vibration state required by the test.

[0052] Reference Figure 1 and Figure 5 In a specific embodiment, the support platform 31 includes a container mounting plate 311, a base plate 312, and a plurality of elastic connectors 313. A gap exists between the container mounting plate 311 and the base plate 312, and the container mounting plate 311 and the base plate 312 are connected via the plurality of elastic connectors 313. The environmental simulation container 2 is mounted on the top of the container mounting plate 311, the vibration feedback sensor 33 is disposed on the container mounting plate 311, and the vibration motor 32 is mounted on the bottom of the container mounting plate 311. Exemplarily, the elastic connectors 313 are springs, and the container mounting plate 311 and the base plate 312 are connected via four springs. The vibration feedback sensor 33 is disposed on the side of the container mounting plate 311.

[0053] In this embodiment, a rigid connection (e.g., welding) is used between the base plate 312 and the equipment foundation (e.g., a test bench). During testing, the base plate 312 should remain stationary relative to the equipment foundation. The elastic connector 313 can expand and contract within a certain range, thereby limiting the vertical amplitude of the container mounting plate 311.

[0054] Reference Figure 1 and Figure 3 In a specific embodiment, the aforementioned concrete durability testing device for simulating a coexisting water pressure and vibration environment further includes a container support 81 and a support base plate 82. The container support 81 is fixed to the support base plate 82, wherein the environmental simulation container 2 is fixed to the container support 81, and the support base plate 82 is fixed to the container mounting plate 311. Exemplarily, the container support 81 is connected to the container barrel 21 and the support base plate 82 by welding to ensure that the vibration effect of the vibration device 3 can be effectively transmitted to the concrete test block 4. The container mounting plate 311 has mounting holes 3111, and the support base plate 82 can be fixed to the container mounting plate 311 by installing base plate bolts 83 in the mounting holes 3111 to ensure effective transmission of vibration.

[0055] Reference Figure 1 and Figure 2 In an optional embodiment, the high-pressure aqueous solution supply device 1 includes a booster pump 11, which is provided with a pressure regulating valve 13, a second pressure gauge 12, a liquid outlet 111, and a liquid inlet 112 for the aqueous solution to enter the booster pump 11, wherein the booster pump 11 is used to pressurize the aqueous solution entering the interior thereof and pump the pressurized aqueous solution into the inner cavity of the environmental simulation container 2.

[0056] In this embodiment, the liquid inlet 112 of the booster pump 11 is connected to the peripheral aqueous solution supply device (not shown in the figure), and the aqueous solution at the liquid inlet 112 is at normal pressure (similar to the tap water pressure, generally lower than 0.2 MPa). The normal-pressure aqueous solution entering the booster pump 11 from the liquid inlet 112 can be converted into a relatively high-pressure aqueous solution after being pressurized by the booster pump 11 and output from the liquid outlet 111 to the environmental simulation container 2; wherein, the second pressure gauge 12 can display the liquid pressure at the liquid outlet 111 of the booster pump 11, and the liquid pressure at the liquid outlet 111 can be adjusted by the pressure regulating valve 13 to meet different test requirements.

[0057] Reference Figure 1 、 Figure 3 and Figure 4In an optional embodiment, the aforementioned concrete durability test device for simulating the coexistence of water pressure and vibration further includes an upper clamping plate 91 and a lower clamping plate 92, and the concrete test block 4 is installed between the upper clamping plate 91 and the lower clamping plate 92 to form a whole with the upper clamping plate 91 and the lower clamping plate 92, and the upper clamping plate 91 and / or the lower clamping plate 92 are fixed in the inner cavity of the environmental simulation container 2, wherein an opening 911 is provided on the upper clamping plate 91 or the lower clamping plate 92, and the opening 911 is arranged opposite to the permeable surface, and the area of ​​the opening 911 is smaller than the area of ​​the permeable surface.

[0058] In this embodiment, for example, the lower clamping plate 92 is fixed to the inner cavity of the container tube 21 by welding, thereby ensuring effective transmission of vibration. The concrete test block 4 is clamped between the upper clamping plate 91 and the lower clamping plate 92 by tightening screws 93. The top surface of the concrete test block 4 is a permeable surface. The upper clamping plate 91 is provided with an opening 911. The opening 911 is arranged opposite the top surface of the concrete test block 4 and is smaller than the size of the top surface of the concrete test block 4. In this way, during the test, only a portion of the top surface of the concrete test block 4 is exposed to the solution, and the aqueous solution can only penetrate into the interior of the concrete test block 4 through the opening 911 and the permeable surface. Therefore, based on the above structural design, the concrete test block 4 can be conveniently and securely installed in the inner cavity of the environmental simulation container 2, while ensuring that during the test, the aqueous solution can only penetrate into the interior of the concrete test block 4 through the permeable surface.

[0059] Correspondingly, an embodiment of the present invention further provides a concrete durability test method in a simulated water pressure and vibration coexistence environment, which is applied to the concrete durability test device in a simulated water pressure and vibration coexistence environment in any of the above embodiments. The concrete durability test method in a simulated water pressure and vibration coexistence environment comprises the following steps:

[0060] S1, pouring concrete into the mold to make a concrete test block 4;

[0061] S2, before the initial setting of the concrete, selecting one of the multiple outer surfaces of the concrete test block 4 as a penetration surface, and pre-embedding multiple sensors at different depths perpendicular to the penetration surface in the concrete test block 4, wherein the sensors include at least a humidity sensor and a vibration sensor;

[0062] S3, curing the concrete test block 4 pre-embedded with multiple sensors, and after the concrete test block 4 has been cured to a specified age, sealing the remaining outer surfaces of the concrete test block 4 except for the permeable surface;

[0063] S4, installing the sealed concrete test block 4 in the inner cavity of the environmental simulation container 2 so that the permeable surface is exposed to the inner cavity of the environmental simulation container 2, and connecting multiple sensors to the data receiving device 5;

[0064] S5, taking the outer surfaces of the concrete test block 4 in a dry state as the initial state, and recording the sensor data received by the data receiving device 5 at this time as the initial value, wherein the sensor data includes at least humidity data;

[0065] S6, turning on the high-pressure aqueous solution supply device 1, which injects an aqueous solution with a specified pressure into the inner cavity of the environmental simulation container 2 through the liquid outlet 111 until the aqueous solution fills the environmental simulation container 2, and then turning off the high-pressure aqueous solution supply device 1, so that the concrete test block 4 is in a high-pressure simulated environment;

[0066] S7, turning on the vibration device 3 to simulate a vibration environment and ensuring that the vibration state of the vibration device 3 meets the test requirements, so that the concrete test block 4 is in a simulated environment of high water pressure and vibration coupling;

[0067] S8, monitor the vibration state of the concrete test block 4 in real time through the data receiving device 5, and record the humidity data changes of the concrete test block 4 at different depths in the direction perpendicular to the penetration surface, so as to obtain the penetration rate of the aqueous solution in the concrete test block 4.

[0068] In the above S1 , specifically, a concrete test block 4 having a size that meets the requirements can be cast in a mold according to the proportions of the components constituting the concrete test block 4 .

[0069] In the above S3, specifically, the remaining outer surface of the concrete test block 4 may be sealed by applying paraffin wax.

[0070] In this embodiment, the concrete durability test method is based on the above steps, which can effectively simulate the actual service environment faced by the lining tunnel structure and provide scientific data for test personnel to study the durability of the concrete test block 4 under the high water pressure and vibration coupling environment.

[0071] Reference Figures 1 to 5 To better understand the concrete durability testing device and method for simulating a water pressure and vibration coexistence environment according to an embodiment of the present invention, in a more specific embodiment, the specific process of conducting a concrete durability test under a high water pressure and vibration coupling environment using the concrete durability testing device for simulating a water pressure and vibration coexistence environment is as follows:

[0072] (1) preparing a plurality of concrete test blocks 4, and selecting at least one concrete test block 4 for testing during the forming process;

[0073] (2) One of the outer surfaces of the concrete test block 4 is selected as the penetration surface, and multiple micro humidity sensors and vibration sensors are pre-embedded in the concrete test block 4 at different depths perpendicular to the penetration surface, wherein each sensor has its own transmission line 6, and the surface layer of the transmission line 6 is made of corrosion-resistant material;

[0074] (3) Curing the concrete test block 4 with the embedded sensor, and after the concrete test block 4 has been cured to the specified age, except for the permeable surface, all other surfaces are evenly coated with paraffin for sealing, so that only the permeable surface is exposed to the solution during the test;

[0075] (4) Place the concrete test block 4 with the embedded sensor on the lower clamping plate 92 with the permeable surface facing upward, cover it with the upper clamping plate 91 and fix it with the fastening screw 93 so that the concrete test block 4 is firmly clamped between the upper clamping plate 91 and the lower clamping plate 92. Then weld the lower clamping plate 92 to the inner surface of the container tube 21 to fix the concrete test block 4 to be tested in the inner cavity of the container tube 21.

[0076] (5) Connect each transmission line 6 to the interface reserved in the container tube 21 of the data receiving device 5, thereby realizing the signal connection between each sensor and the data receiving device 5. At the same time, the state of the surface of the concrete test block 4 when it is dry is used as the initial state, and the humidity data received by the data receiving device 5 at this time is recorded as the initial value;

[0077] (6) Use the sealing bolts 221 to securely connect the sealing cover to the container barrel 21. A rubber sealing ring is provided at the interface between the sealing cover and the container barrel 21 to ensure the watertightness of the container.

[0078] (7) Close the drain valve 26, open the overflow valve 25, the injection valve 24 and the shut-off valve 72, start the booster pump 11, and pump the pre-prepared corrosive aqueous solution into the container barrel 21. Check the second pressure gauge 12 and the flow meter 71, and adjust the pressure regulating valve 13 and the shut-off valve 72 to make the current liquid pressure and flow close to the pressure and flow of domestic tap water. Observe the water injection situation in the container barrel 21 through the visual window 27 to prevent the current liquid pressure and flow from being too high, which may cause the concrete test block 4 and the transmission line 6 in the container barrel 21 to be washed by the high-pressure solution, thereby preventing the paraffin on the surface of the concrete test block 4 from falling off and the transmission line 6 from breaking and loosening. When the aqueous solution in the container barrel 21 overflows from the overflow valve 25, close the overflow valve 25.

[0079] (8) Adjust the pressure regulating valve 13 to gradually increase the solution pressure. Observe the first pressure gauge 23 until the reading displayed by the first pressure gauge 23 reaches the solution pressure level required by the test. Then close the injection valve 24. At this time, if the container tube 21 is in a good sealing state, the liquid pressure in the container tube 21 can be maintained at the level required by the test.

[0080] (9) Turn off the booster pump 11, and then close the water shutoff valve 72 and the pressure regulating valve 13 in sequence to relieve the liquid pressure in the booster pump 11, and then remove the injection pipe 73 from the injection valve 24;

[0081] (10) Turn on the vibration device 3 and start the vibration motor 32. At this time, the environmental simulation container 2 vibrates together with the container mounting plate 311. The vibration can be transmitted to the concrete test block 4 through various intermediate components. During the vibration process, the actual vibration state of the environmental simulation container 2 can gradually reach the vibration state required by the test through repeated automatic adjustment of the vibration feedback sensor 33 and the vibration controller 34. Finally, the concrete test block 4 can be placed in a simulated environment with high water pressure and vibration coupling.

[0082] (11) The vibration state of the concrete test block 4 can be monitored in real time by the data receiving device 5, and the humidity change of the concrete test block 4 at each depth position perpendicular to the penetration surface can be observed, thereby obtaining the penetration rate of the aqueous solution in the concrete test block 4;

[0083] If during the test, it is found that the container tube 21 is depressurized and needs to be pressurized, adjustments can be made through the following steps:

[0084] (a) First, turn off the vibration device 3. After the vibration motor 32 stops vibrating, insert the injection tube 73 into the injection valve 24. Then, open the water shutoff valve 72 and the pressure regulating valve 13. Observe the solution pressure reading on the second pressure gauge 12. When the reading on the second pressure gauge 12 is close to that on the first pressure gauge 23 (indicating that the solution pressure difference between the environmental simulation container 2 and the booster pump 11 is small), the injection valve 24 can be opened.

[0085] (b) Adjust the pressure regulating valve 13 so that the solution pressure reading displayed by the second pressure gauge 12 gradually increases until it reaches the level required by the test. Then close the injection valve 24 and restart the test after executing the above step (9).

[0086] (12) After the test is completed, the vibration device 3 is first turned off, and then the overflow valve 25 and the drain valve 26 are opened in sequence to discharge the solution in the container tube 21. Then, the sealing cover is opened and the fastening screw 93 is removed, and the concrete test block 4 can be taken out of the container tube 21.

[0087] Based on the above test process, the concrete durability test device for simulating the coexistence of water pressure and vibration proposed in the embodiment of the present invention can be set with a variety of test environment conditions. By changing the test environment parameters, such as the solution type and concentration, test time, excitation state (changing the excitation state through the vibration controller 34), solution pressure (changing the solution pressure by adjusting the pressure regulating valve 13 on the booster pump 11), etc., the variation pattern of the permeation rate of different solution media in concrete with each test environment parameter can be obtained. In this way, durability-related tests such as mechanical properties, pore structure analysis, and chemical composition analysis are performed on the concrete test blocks 4 after being subjected to different environments. The variation pattern of these properties with the solution type and concentration, excitation state, solution pressure level, and test time can be examined, thereby providing equipment and data support for conducting concrete durability test research under the coupling effect of high water pressure and vibration.

[0088] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A concrete durability test method simulating a water pressure and vibration coexistence environment, characterized in that: The method comprises: pouring concrete into the mold to make a concrete test block; Before the initial setting of the concrete, one of the outer surfaces of the concrete test block is selected as a permeable surface, and a plurality of sensors are pre-embedded in the concrete test block at different depths perpendicular to the permeable surface, wherein the sensors include at least a humidity sensor and a vibration sensor; Curing the concrete test block pre-embedded with the plurality of sensors, and after the concrete test block has been cured to a specified age, sealing the remaining outer surfaces of the concrete test block except the permeable surface; Installing the sealed concrete test block in the inner cavity of an environmental simulation container so that the permeable surface is exposed to the inner cavity of the environmental simulation container, and connecting the plurality of sensors to a data receiving device; Taking the state when each outer surface of the concrete test block is in a dry state as the initial state, and recording the sensor data received by the data receiving device at this time as the initial value, wherein the sensor data at least includes humidity data; Turning on a high-pressure aqueous solution supply device to inject an aqueous solution with a specified pressure into the inner cavity of the environmental simulation container through a liquid outlet until the aqueous solution fills the environmental simulation container, and then turning off the high-pressure aqueous solution supply device to place the concrete test block in a high-pressure simulated environment; Turning on the vibration device to simulate a vibration environment and ensuring that the vibration state of the vibration device meets the test requirements, so that the concrete test block is in a simulated environment of high water pressure and vibration coupling; The data receiving device monitors the vibration state of the concrete test block in real time and records the humidity data changes of the concrete test block at different depths in a direction perpendicular to the penetration surface, thereby obtaining the penetration rate of the aqueous solution in the concrete test block; The method uses a concrete durability testing device that simulates an environment in which water pressure and vibration coexist, comprising a high-pressure aqueous solution supply device, an environmental simulation container, a vibration device, and a data receiving device. The high-pressure aqueous solution supply device has a liquid outlet that is sealed and communicated with the inner cavity of the environmental simulation container, and the environmental simulation container is fixed to the vibration device. A concrete test block is installed in the inner cavity of the environmental simulation container, and a plurality of sensors are embedded in the concrete test block, and the plurality of sensors are connected to the data receiving device. The concrete test block has a permeable surface, and the plurality of sensors are arranged at different depths perpendicular to the permeable surface. The sensors include at least a humidity sensor and a vibration sensor. The vibration device includes a support platform, a vibration motor, a vibration feedback sensor and a vibration controller, wherein the environment simulation container, the vibration motor and the vibration feedback sensor are all installed on the support platform, and the vibration controller is connected to the vibration feedback sensor and the vibration motor respectively; The support platform includes a container mounting plate; The concrete durability testing device for simulating a water pressure and vibration coexistence environment further includes a container support and a support base plate, wherein the container support is fixed to the support base plate, wherein the environmental simulation container is fixed to the container support, and the support base plate is fixed to the container mounting plate.

2. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to claim 1, characterized in that: The environmental simulation container includes a container tube and a sealing cover sealed to the opening of the container tube. The container tube is provided with a first pressure gauge, a liquid injection valve and an overflow valve; wherein the overflow valve is located on the top of the container tube, the liquid outlet is connected to the inner cavity of the container tube through the liquid injection valve, and the concrete test block is installed in the inner cavity of the container tube.

3. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to claim 2, characterized in that: It also includes a connecting pipe, on which a flow meter and a water shut-off valve are provided. One end of the connecting pipe is connected to the liquid injection valve, and the other end is connected to the liquid outlet.

4. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to claim 2, characterized in that: A visual window is also provided on the top of the container tube.

5. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to claim 2, characterized in that: The sealing cover and / or the container tube are provided with a drain valve.

6. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to claim 1, characterized in that: The support platform includes a base plate and multiple elastic connectors. There is a gap between the container mounting plate and the base plate, and the container mounting plate and the base plate are connected by the multiple elastic connectors. The environmental simulation container is installed on the top of the container mounting plate, the vibration feedback sensor is arranged on the container mounting plate, and the vibration motor is installed on the bottom of the container mounting plate.

7. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to any one of claims 1 to 6, characterized in that: The high-pressure aqueous solution supply device includes a booster pump, which is provided with a pressure regulating valve, a second pressure gauge, the liquid outlet, and a liquid inlet for the aqueous solution to enter the booster pump. The booster pump is used to pressurize the aqueous solution entering the booster pump and pump the pressurized aqueous solution into the inner cavity of the environmental simulation container.

8. The concrete durability test method in a simulated water pressure and vibration coexistence environment according to any one of claims 1 to 6, characterized in that: It also includes an upper plywood and a lower plywood, the concrete test block is installed between the upper plywood and the lower plywood to form a whole with the upper plywood and the lower plywood, the upper plywood and the lower plywood are fixed in the inner cavity of the environmental simulation container, wherein an opening is provided on the upper plywood or the lower plywood, the opening is arranged opposite to the permeable surface, and the area of ​​the opening is smaller than the area of ​​the permeable surface.

Images