Device for detecting frost heaving resistance of concrete under coupling action of frost heaving force of foundation soil layer

Abstract

The utility model provides a device for detecting the frost heaving resistance of concrete under the coupling action of frost heaving force of a foundation soil layer, and relates to the technical field of material low-temperature test devices, the device comprises a frost heaving device, the frost heaving device comprises a frost heaving box, temperature control devices, a lining channel body and the foundation soil layer, the temperature control devices are arranged at the upper end and the lower end of the frost heaving box, and the temperature control devices are arranged on the foundation soil layer. The lining channel body and the foundation soil layer are arranged between the upper temperature control device and the lower temperature control device in a filling mode. The detection device comprises a plurality of frost heaving pressure sensors, a plurality of temperature sensors and a plurality of water content and salt content sensors; the utility model provides a plurality of data acquisition devices for testing temperature migration, moisture migration, salt migration, frost heaving amount, frost heaving force, water and salt content and the like of a concrete lining channel body and a lower foundation soil layer in a coupling environment, so that more comprehensive evaluation and analysis on the soil frost heaving force are realized; and a more comprehensive data support is provided for comprehensively analyzing the frost heaving force of the lining channel body.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature material testing devices, in particular to a device for detecting the anti-freezing and swelling performance of concrete under the coupling effect of the frost swelling force of a base soil layer. Background Art

[0002] The Hetao region of Inner Mongolia is located in the cold zone in northern my country, with extremely low temperatures in winter. Channels are widely distributed in the region, which are crucial for crop irrigation and water transport. However, in severe cold environments, the temperature difference between the lining concrete and the channel base soil causes heat loss, and the base soil freezes to form a permafrost layer. The volume expansion of the frozen soil generates frost heave force, which will lift or crack the lining structure, causing frost heave damage to the channel. Therefore, the temperature conductivity of the lining channel has a significant impact on the frost heave phenomenon. However, the field working conditions are harsh, the data collection efficiency is low, and the instrument is easily damaged, making the test difficult and costly.

[0003] At present, traditional concrete temperature conduction performance testing devices can only measure the temperature gradient on the surface of concrete specimens, and cannot quantitatively analyze the temperature conduction process inside the lined channel body. In addition, these devices have high requirements for the test environment, it is difficult to flexibly adjust the environmental parameters, and they cannot effectively simulate the actual engineering environment, making it difficult to apply them to the field of lining engineering. At the same time, most of the existing frost heave strain measurement technologies lack quantitative analysis of the internal temperature, water and salt content, etc. of the lined channel body. Therefore, the existing technology still needs to be improved.

[0004] In summary, how to provide a temperature conduction and frost heave strain testing device and method that can quantitatively analyze the temperature conduction process inside the lined channel body and comprehensively measure the lined channel body is one of the technical problems that need to be urgently solved in this field.

[0005] In view of this, a device and method for testing temperature conduction and frost heave strain of a concrete lined channel with a publication number of "CN114636729A" in the prior art includes: a frost heave device, which includes a lined channel body and a temperature control device, and the temperature control device is used to provide a predetermined temperature for the lined channel body; a detection device, which includes a lateral deformation detection device, a vertical deformation detection device and a plurality of temperature sensors; the lateral deformation detection device is used to detect the lateral frost heave strain parameters of the lined channel body; a plurality of temperature sensors are arranged along the axial direction of the lined channel body and embedded in the interior of the lined channel body, and are used to detect the temperature conduction performance of the lined channel body. The utility model can achieve the technical effect of quantitatively analyzing the internal temperature conduction process of the lined channel body and measuring the concrete lining plate and the channel foundation soil as a whole.

[0006] However, the above-mentioned device still has obvious defects during use: although the above-mentioned device solves many practical problems of field data collection, the data collection is relatively limited and it is difficult to meet more comprehensive data analysis requirements. As we all know, the salt content in the soil in different regions also varies, and the salt content will affect the freezing point of water in the soil and the volume change of frost heave. Therefore, the above-mentioned data is also a key factor in evaluating the frost heave force of the soil. Utility Model Content

[0007] The utility model aims to provide a device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer, so as to solve the problems raised in the above-mentioned background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer, comprising:

[0010] A frost heave device, the frost heave device comprising a frost heave box, a temperature control device, a lining channel body and a base soil layer, the temperature control device being arranged at the upper and lower ends of the frost heave box, the temperature control device being used to provide a predetermined temperature for the lining channel body and the base soil layer, the lining channel body and the base soil layer being filled and arranged between the upper and lower temperature control devices;

[0011] A detection device, the detection device comprising a plurality of frost heave pressure sensors, a plurality of temperature sensors, and a plurality of water content and salt content sensors, wherein the frost heave pressure sensors are embedded in the center of the base soil layer and arranged close to one side of the lining channel body, and the temperature sensors, water content and salt content sensors are embedded in the interior of the lining channel body and the base soil layer and arranged along the axial direction of the frost heave box;

[0012] A plurality of the frost heave pressure sensors are electrically connected to an external pressure display;

[0013] The temperature sensors are electrically connected to an external FBG demodulator;

[0014] Several of the water content and salt content sensors are electrically connected to an external network data acquisition instrument.

[0015] Preferably, the temperature control device includes an upper temperature change box and a lower temperature change box, the upper temperature change box is fixedly arranged at the upper end of the lined channel body, and the lower temperature change box is fixedly arranged at the lower end of the lined channel body, and the upper temperature change box and the lower temperature change box are provided with a water inlet and a water outlet for the alcohol circulating fluid.

[0016] Preferably, a load-bearing partition is fixedly installed in the frost heave box, and the load-bearing partition is arranged between the base soil layer and the lower temperature-changing box to bear the weight of the lining channel body and the base soil layer. The load-bearing partition is provided with grille holes for water and salt to pass through.

[0017] Preferably, a water replenishment tank is further provided outside the frost heave tank, and the water replenishment tank is connected with the base soil layer and the lined channel body through a pipeline, so as to provide water and salt replenishment for the lined channel body and the base soil layer.

[0018] Preferably, a displacement restraint device is fixedly provided on the top of the frost heave box, and a vertical displacement meter is connected to the bottom of the displacement restraint device. The vertical displacement meter is against the top of the upper temperature-changing box to detect the vertical displacement change of the lining channel body after frost heave.

[0019] Preferably, the frost heave pressure sensor comprises a bearing platform and a pressure sensor body, the bearing platform is buried in the base soil layer and in contact with the bottom end of the lined channel body, and the pressure sensor body is arranged below the bearing platform.

[0020] Preferably, the water replenishment tank is fixedly installed on the outside of the frost heave tank, and the water replenishment tank is a Martens flask with a water-salt solution loaded inside.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] The utility model provides a plurality of data acquisition devices for testing the temperature migration, moisture migration, salt migration, frost heave amount, frost heave force, water-salt content, etc. of a concrete lined channel body and a lower base soil layer under a coupled environment, thereby facilitating a more multi-dimensional data sample collection of soil in cold regions, thereby achieving a more comprehensive evaluation and analysis of the soil frost heave force, and providing more comprehensive data support for a comprehensive analysis of the frost heave force of the lined channel body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0024] In the figure: 1 frost heave box, 2 lining channel body, 3 base soil layer, 4 frost heave pressure sensor, 5 temperature sensor, 6 water content and salt content sensor, 7 pressure display instrument, 8 FBG demodulator, 9 network data acquisition instrument, 10 upper temperature change box, 11 lower temperature change box, 12 bearing partition, 13 water supply tank, 14 displacement constraint device, 15 vertical displacement meter, 16 bearing platform, 17 pressure sensor body. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1 , the utility model provides a technical solution:

[0027] Embodiment 1:

[0028] A device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer, comprising:

[0029] The frost heave device comprises a frost heave box 1, a temperature control device, a lining channel body 2 and a base soil layer 3. The temperature control device is arranged at the upper and lower ends of the frost heave box 1. The temperature control device is used to provide a predetermined temperature for the lining channel body 2 and the base soil layer 3. The lining channel body 2 and the base soil layer 3 are filled and arranged between the upper and lower temperature control devices.

[0030] The detection device includes a plurality of frost heave pressure sensors 4, a plurality of temperature sensors 5, and a plurality of water content and salt content sensors 6. The frost heave pressure sensor 4 is embedded in the center of the base soil layer 3 and is arranged close to one side of the lining channel body 2. The temperature sensor 5 and the water content and salt content sensors 6 are embedded in the interior of the lining channel body 2 and the base soil layer 3 and are arranged along the axial direction of the frost heave box 1.

[0031] A plurality of frost heave pressure sensors 4 are electrically connected to an external pressure display instrument 7;

[0032] A plurality of temperature sensors 5 are electrically connected to an external FBG demodulator 8;

[0033] A plurality of water content and salt content sensors 6 are electrically connected to an external network data acquisition instrument 9 .

[0034] In this embodiment, the frost heave box 1 serves as the main bearing device of the device, and temperature control devices are arranged on the upper and lower sides thereof, and the lining channel body 2 and the base soil layer 3 are filled between the upper and lower temperature control devices, wherein the upper temperature variable box 10 is fixedly arranged at the upper end of the lining channel body 2, and the lower temperature variable box 11 is fixedly arranged at the lower end of the lining channel body 2, and the upper temperature variable box 10 and the lower temperature variable box 11 are provided with a water inlet and a water outlet for the alcohol circulating liquid, and the alcohol solution circulation inside the temperature control device is realized by an external pump, so as to provide a predetermined temperature for the lining channel body 2 and the base soil layer 3, and a detection device is also arranged in the frost heave box 1, including a frost heave pressure sensor 4, a plurality of temperature sensors 5, and a plurality of water content and salt content sensors 6, the frost heave pressure sensor 4 is used to detect the frost heave force of the base soil layer 3 at a predetermined temperature, the temperature sensor 5 is used to detect the temperature conductivity of the lining channel body 2 and the base soil 3 at a predetermined temperature, and the water content and salt content sensor 6 is used to detect the lining The water and salt content and migration amount in the channel body 2 and the base soil 3. The water content and salt content sensor 6 in this embodiment adopts the JD-GTS04 tubular soil moisture sensor, wherein the frost heave pressure sensor 4 is embedded in the center position of the base soil layer 3 and is arranged close to one side of the lined channel body 2. The temperature sensor 5 and the water content and salt content sensor 6 are all embedded in the lined channel body 2 and the base soil layer 3 and arranged along the axial direction of the frost heave box 1. By connecting the above-mentioned multiple sensors with the corresponding external data acquisition device, data collection of the base soil layer 3 and the lined channel body 2 is realized. Specifically, several frost heave pressure sensors 4 are electrically connected to the external pressure display 7; several temperature sensors 5 are electrically connected to the external FBG demodulator 8; several water content and salt content sensors 6 are electrically connected to the external network data acquisition instrument 9. The above-mentioned external pressure display 7, FBG demodulator 8 and network data acquisition instrument 9 are also connected to an industrial computer to perform comprehensive data collection.

[0035] Embodiment 2:

[0036] A load-bearing partition 12 is also fixedly installed in the frost heave box 1. The load-bearing partition 12 is arranged between the base soil layer 3 and the lower temperature-changing box 11 to bear the weight of the lining channel body 2 and the base soil layer 3. The load-bearing partition 12 is provided with grille holes for water and salt to pass through.

[0037] In this embodiment, a bearing device for the lined channel body 2 and the base soil layer 3 in the frost heave box 1 is further disclosed, and the bearing partition 12 can achieve normal passage of water and salt.

[0038] Embodiment three:

[0039] A water replenishment tank 13 is also provided outside the frost heave tank 1. The water replenishment tank 13 is connected to the base soil layer 3 and the lined channel body 2 through a pipeline, and is used to provide water and salt replenishment for the lined channel body 2 and the base soil layer 3. The water replenishment tank 13 is fixedly installed on the outside of the frost heave tank 1, and the water replenishment tank 13 is a Martens flask with a water-salt solution loaded inside.

[0040] In this embodiment, a water-salt replenishment mechanism for the lining channel body 2 and the base soil layer 3 is further disclosed, thereby facilitating the adjustment of the water-salt content inside the lining channel body 2 and the base soil layer 3 .

[0041] Embodiment 4:

[0042] A displacement restraint device 14 is also fixedly provided on the top of the frost heave box 1, and a vertical displacement meter 15 is connected to the bottom of the displacement restraint device 14. The vertical displacement meter 15 is against the top of the upper temperature-changing box 10 to detect the vertical displacement change of the lining channel body 2 after frost heave.

[0043] Since the base soil layer 3 will expand in volume during the freezing process, and the lateral volume expansion is constrained by the frost heave box 1 and cannot proceed, the base soil layer 3 will undergo vertical displacement changes during the frost heave process, and the displacement changes will be transmitted to the lining channel body 2 and the upper temperature-changing box 10. The upper temperature-changing box 10 will push the vertical displacement meter 15 upward during the expansion of the base soil layer 3, thereby generating displacement. By detecting the displacement, it is convenient to calculate the frost heave force on the lining channel body 2.

[0044] Embodiment five:

[0045] The frost heave pressure sensor 4 includes a bearing platform 16 and a pressure sensor body 17 . The bearing platform 16 is buried in the base soil layer 3 and contacts the bottom end of the lined channel body 2 . The pressure sensor body 17 is arranged below the bearing platform 16 .

[0046] In this embodiment, the specific structure of the frost heave pressure sensor 4 is further disclosed, and the pressure sensor body 17 is installed through the supporting platform 16. The pressure sensor body 17 in this embodiment is a patch type pressure sensor. The patch type pressure sensor in this embodiment adopts the A401 thin film pressure sensor produced by Ruiruo Measurement and Control.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer, characterized in that: include: A frost heave device, the frost heave device comprising a frost heave box, a temperature control device, a lining channel body and a base soil layer, the temperature control device being arranged at the upper and lower ends of the frost heave box, the temperature control device being used to provide a predetermined temperature for the lining channel body and the base soil layer, the lining channel body and the base soil layer being filled and arranged between the upper and lower temperature control devices; A detection device, the detection device comprising a plurality of frost heave pressure sensors, a plurality of temperature sensors, and a plurality of water content and salt content sensors, wherein the frost heave pressure sensors are embedded in the center of the base soil layer and arranged close to one side of the lining channel body, and the temperature sensors, water content and salt content sensors are embedded in the interior of the lining channel body and the base soil layer and arranged along the axial direction of the frost heave box; A plurality of the frost heave pressure sensors are electrically connected to an external pressure display; The temperature sensors are electrically connected to an external FBG demodulator; Several of the water content and salt content sensors are electrically connected to an external network data acquisition instrument.

2. A device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer according to claim 1, characterized in that: The temperature control device includes an upper temperature changing box and a lower temperature changing box. The upper temperature changing box is fixedly arranged at the upper end of the lined channel body, and the lower temperature changing box is fixedly arranged at the lower end of the lined channel body. The upper temperature changing box and the lower temperature changing box are provided with a water inlet and a water outlet for the alcohol circulating fluid.

3. A device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer according to claim 2, characterized in that: A load-bearing partition is also fixedly installed in the frost heave box. The load-bearing partition is arranged between the base soil layer and the lower temperature-changing box to bear the weight of the lining channel body and the base soil layer. The load-bearing partition is provided with grille holes for water and salt to pass through.

4. A device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer according to claim 1 or 3, characterized in that: A water replenishment tank is also provided outside the frost heave tank, and the water replenishment tank is connected with the base soil layer and the lined channel body through a pipeline, so as to provide water and salt replenishment for the lined channel body and the base soil layer.

5. The device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer according to claim 4 is characterized in that: A displacement restraint device is also fixedly provided on the top of the frost heave box, and a vertical displacement meter is connected to the bottom of the displacement restraint device. The vertical displacement meter is against the top of the upper temperature-changing box to detect the vertical displacement change of the lining channel body after frost heave.

6. The device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer according to claim 5 is characterized in that: The frost heave pressure sensor comprises a bearing platform and a pressure sensor body. The bearing platform is buried in the base soil layer and contacts the bottom end of the lining channel body. The pressure sensor body is arranged below the bearing platform.

7. The device for detecting the anti-frost heaving performance of concrete under the coupling effect of frost heaving force of base soil layer according to claim 6 is characterized in that: The water replenishment tank is fixedly installed on the outside of the frost heave tank, and the water replenishment tank is a Martens flask with a water-salt solution loaded inside.

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