An experimental device and method for detecting frost heaving of a concrete roadbed

Abstract

The application discloses a kind of experimental equipment and method for detecting concrete roadbed frost heaving, it is related to lining freeze-thaw experimental equipment technical field, including body, detection mechanism is arranged in the inside of the body, the detection mechanism includes being opened in the capacity cavity of the body inside, the inside of the capacity cavity is filled with frost heaving soil layer, temperature sensing module is vertically installed in the inside of the capacity cavity, the temperature sensing module is buried in the inside of frost heaving soil layer, the top of the capacity cavity is installed with temperature control bin, the temperature control bin is attached to the upper surface of frost heaving soil layer;The top of the detection mechanism is erected with lining component;The outside of the lining component is carried with seal mechanism, the seal mechanism includes fixed mounting in the top of the body with backing plate.The experimental equipment and method for detecting concrete roadbed frost heaving disclosed in the application have multifunctionality, high efficiency and data precision effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lining freeze-thaw experiment equipment, and particularly relates to an experimental equipment and method for detecting concrete roadbed frost heaving. BACKGROUND

[0002] The concrete lining channel frost heaving experiment is an experiment for studying the frost heaving deformation, cracking and anti-freezing measures of the concrete channel under the action of freeze-thaw cycles; the frost heaving displacement, stress change and frost resistance of the lining structure are tested through simulation of a low-temperature environment to evaluate the material durability and optimize the design and prevent frost damage; the experiment usually includes temperature control, water supply, deformation monitoring and other links to provide technical basis for anti-frost heaving of channel engineering in cold regions.

[0003] A Chinese patent with an application number CN119413835B provides a concrete lining channel frost heaving strain experimental device, relating to the technical field of freeze-thaw cycle test devices, which comprises a frost heaving body containing bin, a plurality of temperature sensors are uniformly arranged at the axis of the frost heaving body containing bin from bottom to top; a simulated lining, the frost heaving body containing bin below the simulated lining is filled with a frost heaving soil layer, an axial displacement monitoring device is used to detect the axial displacement of the simulated lining; a freeze-thaw medium is pumped into the medium containing bin, and the freeze-thaw medium exchanges heat with the frost heaving body containing bin above to cause the frost heaving soil layer to change.

[0004] However, the shape of the simulated lining is limited in actual use, deviating from the "V" shaped structure of the lining channel, and the device can only detect longitudinal frost heaving force, while the frost heaving displacement of the lining structure actually occurs simultaneously in the X-Y axis, which has a short board in use; on the other hand, the direction of soil freezing is usually gradually developed from the surface to the inside, and soil freezing is caused by surface heat dissipation (such as air temperature falling below 0℃), heat is lost from the inside of the soil to the surface, causing the surface layer to cool to freezing point, forming a freezing front and gradually advancing to the deep layer, and the device is not accurate in temperature control direction, so it cannot effectively simulate the actual state of lining frost heaving in the natural environment, and the accuracy of the experimental data needs to be improved during frost heaving detection, and the simulated lining needs to be removed when reused, which is a tedious process with large amount of work. SUMMARY

[0005] The present application discloses an experimental equipment and method for detecting concrete roadbed frost heaving, aiming to solve the technical problems of the device in the background art, which has operation short board and needs to improve the accuracy of data.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] An experimental equipment and method for detecting frost heaving of concrete roadbed, comprising a machine body, a detection mechanism arranged in the machine body, a capacity cavity opened in the machine body, a frost heaving soil layer filled in the capacity cavity, a temperature sensing module vertically arranged in the capacity cavity and embedded in the frost heaving soil layer, and a temperature control bin arranged on the top of the capacity cavity and attached to the upper surface of the frost heaving soil layer.

[0008] A lining member arranged on the top of the detection mechanism.

[0009] A mold sealing mechanism arranged on the outer side of the lining member, comprising a backing plate fixedly arranged on the top of the machine body.

[0010] After the lining member is carried on the outer side of the lining member by the mold sealing mechanism and the gypsum sealing film treatment is completed, the detection mechanism is used to perform a frost heaving force experiment on the lining member.

[0011] The lining member comprises a framework arranged on the top of the machine body, longitudinal and lateral sample marks arranged on the middle and both ends of the framework by a banner member, and the longitudinal and lateral sample marks are pressed to drive the banner member to deform horizontally and vertically to break and remove the gypsum.

[0012] The lining member is arranged instead of the traditional prefabricated concrete lining structure, the mold sealing mechanism is used to prefabricate the lining member, the detection mechanism is used to perform a frost heaving force experiment on the lining member, the lining member can be repeatedly used, the lining member itself is close to the "V" shaped structure of the concrete lining channel, and the detection mechanism is used to detect the horizontal and vertical frost heaving forces, so that the accuracy and perfection of the detection are greatly improved.

[0013] In a preferred scheme, the detection mechanism further comprises a plurality of positioning grooves arranged at equal intervals on the top of the machine body, a plurality of slide rail members are clamped in the positioning grooves, a distance measuring probe is arranged at the bottom of each slide rail member, and the distance measuring probe is in extrusion contact with the lining member.

[0014] The slide rail members with the distance measuring probes are arranged in the positioning grooves, the frost heaving soil layer is expanded and extruded to the lining member by the temperature control bin, the horizontal and vertical displacement amounts of the lining member are obtained by the distance measuring probes, the frost depth of the frost heaving soil layer is obtained by the temperature sensing module, the normal frost heaving force of the lining member along the X-Y axis is calculated, and the perfection of the equipment is ensured.

[0015] In a preferred scheme, the upper and lower ends of the longitudinal and transverse markers are flush with the outer surface of the framework, the interior of the framework is grouted with a gypsum layer, the interior of the longitudinal and transverse markers 303 is threadedly connected with a driving member, the driving member is connected with the longitudinal marker through a Z-shaped elastic sheet, and the driving member is connected with the banner member.

[0016] By setting the framework structure with the longitudinal and transverse markers installed through the banner member, pouring the gypsum layer into the interior of the framework, and simulating the concrete lining channel object through the gypsum layer and the framework, the frost heaving test is performed, and the lining member can be repeatedly used, and the normal frost heaving force received by the lining member along the X-Y axis can be tested through the longitudinal and transverse markers, thereby improving the economic benefit and functionality.

[0017] In a preferred scheme, the temperature control bin is installed on the top of the base plate, the framework is arranged in the middle of the base plate, the bottom of the base plate is provided with a lower sealing plate, the lower sealing plate is in extrusion contact with the top of the frost heaving soil layer, so that the frost heaving soil layer forms a "V" shaped interval, the top of the framework is attached with an upper sealing plate, the upper and lower ends of the framework are closed by the upper and lower sealing plates, the framework and the upper sealing plate are both provided with grouting openings, and the grouting openings of the two groups are aligned when the framework and the upper sealing plate are attached.

[0018] By setting the upper and lower sealing plates with quick release and the base plate structure, the frost heaving soil layer in the capacity cavity is pressed by the lower sealing plate, so that the upper surface of the frost heaving soil layer forms a "V" shaped interval for placing the lining member, the upper sealing plate is fixed to the surface of the lining member, the grouting openings are used to pour gypsum slurry into the interior of the lining member, and the gypsum slurry is allowed to solidify, so that the lining member which can be repeatedly used is prefabricated, and the perfection of the equipment is ensured.

[0019] In a preferred scheme, the top of the framework is symmetrically provided with a handle at both ends, two bolt rods are threadedly installed between each handle and the side wall of the machine body, the top of the machine body is symmetrically provided with a reinforcing rod at both ends, and the bolt rods pass through the interior of the reinforcing rod.

[0020] By setting the handle structure at both ends of the framework which is limited by the bolt rods and the reinforcing rod, the stability of the framework when being extruded by the frost heaving soil layer is ensured, and the perfection of the equipment is ensured.

[0021] A use method of an experimental equipment for detecting frost heaving of a concrete roadbed, comprising the following steps:

[0022] S1: First, the worker places the lining member on the inside of the detection mechanism of the machine body, and at the same time, fixes the mold closing mechanism to the outside of the lining member, and then pours gypsum slurry into the inside of the mold closing mechanism, and after waiting for the gypsum to solidify in the inside of the lining member, the mold closing mechanism is removed;

[0023] S2: Then, the detection mechanism is started, and the detection mechanism cools the soil layer inside the machine body, and at the same time, the frost heaving reaction occurs, and at the same time, the outside of the lining member is extruded, at this time, the detection mechanism detects the frost heaving depth of the soil layer, the displacement amount of the lining member along the transverse direction, and the displacement amount of the lining member along the longitudinal direction, respectively;

[0024] S3: After the worker completes the detection, the skeleton containing gypsum is lifted out and placed on the top of the platform, at this time, the bottom of the longitudinal marker is in contact with the platform, and the worker uses a hammer to knock the longitudinal marker position of the gypsum layer, and the longitudinal marker is pressed to cause the deformation of the strip piece, thereby breaking the entire gypsum layer.

[0025] As can be seen from the above, the experimental equipment and method for detecting the frost heaving of the concrete roadbed provided by the present application has the following technical effects.

[0026] Firstly, the sliding rail structure carrying the distance measuring probe is arranged, the sliding rail is installed in the positioning groove, and the frost heaving soil layer is expanded and extruded to extrude the lining member by cooperating with the temperature control bin cooling, the transverse displacement and longitudinal displacement of the lining member are obtained by the distance measuring probe, and the frost depth of the frost heaving soil layer is obtained by the temperature sensing module, so that the normal frost heaving force of the lining member along the X-Y axis is calculated at the same time, the measured data is closer to the frost heaving force value of the concrete lining channel in the real environment, and the temperature control bin arranged on the top of the machine body is cooled from the top of the frost heaving soil layer, so that the actual environment is closer (the direction of soil freezing is gradually developed from the surface to the inside, the soil freezing is caused by heat dissipation from the surface, the heat flows from the inside of the soil to the surface, the surface layer is cooled to the freezing point first, a freezing front is formed and gradually advances to the deep layer), and the accuracy and functionality of the equipment operation are improved.

[0027] Secondly, the skeleton structure provided with the longitudinal marker and the transverse marker is arranged by using the strip piece, the frost heaving soil layer in the capacity cavity is pressed by the lower sealing plate, so that the upper surface of the frost heaving soil layer forms a "V" type interval for placing the lining member, the upper sealing plate is fixed to the surface of the lining member, the gypsum slurry is poured into the inside of the lining member through the grouting port, and the gypsum slurry is solidified, so that the reusable lining member is prefabricated, the frost heaving test is simulated by using the concrete lining channel, and the present application is different from the traditional frost heaving test which needs to use the prefabricated concrete lining structure once, the lining member can be repeatedly used, and the shape is closer to the concrete lining channel, so that the economic benefit and functionality are improved.

[0028] Thirdly, the driving part can be hit by a hammer, at this time, the driving part is pulled by the thread to twist and rotate the banner part around the driving part, and the driving part can move longitudinally, so that the gypsum layer is more easily broken, the gypsum layer can be quickly cleaned, and the reuse efficiency of the equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The overall structure diagram of the present application is shown.

[0030] Figure 2 The overall operation state diagram of the present application is shown.

[0031] Figure 3 The overall structure explosion diagram of the present application is shown.

[0032] Figure 4 The machine structure sectional view of the present application is shown.

[0033] Figure 5 The lining component stress structure diagram of the present application is shown.

[0034] Figure 6 The lining component structure diagram of the present application is shown.

[0035] Figure 7 The mold closing mechanism structure explosion diagram of the present application is shown.

[0036] Figure 8 The temperature control bin structure sectional view of the present application is shown.

[0037] Figure 9 The longitudinal marker state one structure sectional view of the present application is shown.

[0038] Figure 10 The longitudinal marker state two structure sectional view of the present application is shown, and the arrow is the direction of force.

[0039] Figure 11 The longitudinal marker state one structure top view of the present application is shown.

[0040] Figure 12 The longitudinal marker state two structure top view of the present application is shown, and the arrow is the direction of rotation.

[0041] In the figure: 1, body; 2, detection mechanism; 201, capacity cavity; 202, temperature sensing module; 203, temperature control bin; 204, positioning groove; 205, sliding rail piece; 206, universal support; 207, distance measuring probe; 3, lining component; 301, framework; 302, longitudinal scale; 3021, driving piece; 3022, Z-shaped elastic sheet; 303, transverse scale; 304, banner piece; 305, handle; 306, bolt rod; 307, reinforcing rod; 4, mold sealing mechanism; 401, backing plate; 402, lower sealing plate; 403, upper sealing plate; 404, threaded port; 405, bolt piece; 406, grouting port; 407, flow-through groove; 5, water content sensor. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all.

[0043] The experimental equipment and method for detecting concrete roadbed frost heaving disclosed in the present application are mainly applied to the scene of frost heaving simulation test on concrete lining channels.

[0044] Reference Figures 1 to 12 An experimental equipment and method for detecting concrete roadbed frost heaving, comprising a body 1, the inside of the body 1 is provided with a detection mechanism 2, the detection mechanism 2 comprises a capacity cavity 201 opened in the inside of the body 1, the inside of the capacity cavity 201 is filled with a frost heaving soil layer, a temperature sensing module 202 is vertically installed in the inside of the capacity cavity 201, the temperature sensing module 202 is buried in the inside of the frost heaving soil layer, a temperature control bin 203 is installed on the top of the capacity cavity 201, the temperature control bin 203 is attached to the upper surface of the frost heaving soil layer;

[0045] The top of the detection mechanism 2 is provided with a lining component 3;

[0046] The outside of the lining component 3 is provided with a mold sealing mechanism 4, the mold sealing mechanism 4 comprises a backing plate 401 fixedly installed on the top of the body 1;

[0047] After the mold sealing mechanism 4 is carried on the outside of the lining component 3 and the gypsum sealing film processing is completed, the detection mechanism 2 is used to perform a frost heaving force experiment on the lining component 3.

[0048] In the embodiment, the worker places the lining member 3 inside the detection mechanism 2 on the machine body 1, fixes the sealing mechanism 4 outside the lining member 3, pours the gypsum slurry into the sealing mechanism 4, removes the sealing mechanism 4 after the gypsum solidifies inside the lining member 3, and then starts the detection mechanism 2 to cool the soil layer inside the machine body 1. The soil layer is cooled and a frost heaving reaction occurs, which extrudes the outside of the lining member 3. At this time, the detection mechanism 2 detects the frost heaving depth of the soil layer, the lateral displacement of the lining member 3, and the longitudinal displacement of the lining member 3. The actual frost heaving force distribution of the test point is obtained according to P1=Ef*S1 / H and P2=Ef*S2 / H (P1 and P2 are the normal frost heaving forces of each point of the simulated lining, S1 is the vertical displacement change amount of the lining, S2 is the vertical displacement change amount of the lining, H is the frost depth of the base soil, and Ef is the dynamic elastic modulus of the base soil).

[0049] With reference to Figures 1 to 5 , Figure 8 In a preferred embodiment, the detection mechanism 2 further comprises a plurality of positioning grooves 204 arranged equidistantly on the top of the machine body 1. A plurality of slide rail members 205 are clamped inside the positioning grooves 204. The bottom of each slide rail member 205 is provided with a distance measuring probe 207, which extrudes and contacts the lining member 3.

[0050] The worker pours the gypsum slurry into the sealing mechanism 4, removes the sealing mechanism 4 after the gypsum solidifies inside the lining member 3, and then clamps a plurality of slide rail members 205 into the inside of the positioning grooves 204, so that the distance measuring probes 207 at the bottom of the slide rail members 205 abut against the top and side wall of the lining member 3. Then the worker starts the temperature control bin 203 to cool the soil layer inside the machine body 1 by introducing a cooling medium (low-temperature gas or low-temperature liquid) into the temperature control bin 203. The soil layer is cooled and a frost heaving reaction occurs, which extrudes the outside of the lining member 3. At this time, the distance measuring probes 207 contacting the surface of the lining member 3 are extruded and shrink, so that S1 and S2 (S1 is the vertical displacement change amount of the lining, and S2 is the vertical displacement change amount of the lining) are measured. At the same time, the depth of the lowest temperature point received by the temperature sensing module 202 under the soil layer is observed, which is H (H is the frost depth of the base soil).

[0051] Each slide rail member 205 is rotatably installed with a universal support 206 at the bottom. The distance measuring probe 207 is fixedly installed at the bottom of the universal support 206. The worker can freely adjust the placement angle of the distance measuring probe 207 by rotating the universal support 206.

[0052] With reference to Figures 1 to 7In a preferred embodiment, the lining member 3 comprises a framework 301 erected on the top of the body 1, longitudinal markers 302 and transverse markers 303 are installed at the middle and both ends of the framework 301 through the banner member 304, the upper and lower ends of the longitudinal markers 302 and the transverse markers 303 are flush with the outer surface of the framework 301, the inside of the framework 301 is grouted with a gypsum layer, the inside of the longitudinal markers 302 and the transverse markers 303 are threadedly connected with a driving member 3021, the driving member 3021 and the longitudinal markers 302 are connected with a Z-shaped spring 3022, and the driving member 3021 is connected with the banner member 304.

[0053] The worker places the framework 301 inside the detection mechanism 2 on the body 1, and fixes the mold sealing mechanism 4 outside the framework 301, then pours the gypsum slurry into the inside of the mold sealing mechanism 4, the gypsum slurry flows along the inside of the framework 301 until the entire framework 301 is filled, after the gypsum solidifies in the inside of the framework 301, the mold sealing mechanism 4 is removed, then the worker inserts a plurality of slide rail members 205 into the inside of the positioning groove 204 respectively, and makes the distance measuring probe 207 at the bottom of the slide rail member 205 abut against the longitudinal markers 302 and the transverse markers 303 respectively, then the worker starts the temperature control bin 203, introduces the cooling medium (low-temperature gas or low-temperature liquid) into the inside of the temperature control bin 203, and cools the soil layer inside the body 1 by heat transfer, the soil layer is cooled and frost heaving occurs at the same time, so as to press the longitudinal markers 302 and the transverse markers 303, and make the longitudinal markers 302 and the transverse markers 303 overcome the pulling of the banner member 304 and move outward with a small amplitude, at this time, the distance measuring probe 207 on the surface of the longitudinal markers 302 and the transverse markers 303 is pressed and shrinks, so as to measure S1 and S2.

[0054] After the worker completes the detection, the framework 301 containing the gypsum is lifted out and placed on the top of the platform, at this time, the bottom of the longitudinal markers 302 abuts against the platform, the worker swings the hammer to knock the surface of the gypsum layer, and preliminarily breaks the gypsum, then the worker knocks the driving member 3021 with the hammer, at this time, the driving member 3021 is pulled by the thread, so as to make the banner member 304 twist and rotate inward around the center of the driving member 3021, and the driving member 3021 moves longitudinally with a small amplitude (as shown in Figure 10 and Figure 12 , so as to exert horizontal and longitudinal shearing force on the gypsum layer, so that the gypsum layer is more easily broken, and after the gypsum layer is separated, the Z-shaped spring 3022 and the banner member 304 push the driving member 3021 to reset and move, and the internal structure of the transverse markers 303 and the demolding mode are the same as above, in this way, the gypsum layer can be quickly cleaned, and the repeated use efficiency of the equipment is improved.

[0055] Referring to Figure 1 ,Figure 3 、 Figures 6 to 7 In a preferred embodiment, the temperature control bin 203 is installed on the top of the base plate 401, the framework 301 is erected on the middle of the base plate 401, the bottom of the base plate 401 is provided with the lower sealing plate 402, the lower sealing plate 402 is extruded and contacted on the top of the frost heaving soil layer, so that the frost heaving soil layer forms a "V" type interval, the top of the framework 301 is attached with the upper sealing plate 403, the upper sealing plate 403 and the lower sealing plate 402 form a closed structure on the upper and lower ends of the framework 301, the two ends of the framework 301 and the upper sealing plate 403 are provided with the grouting ports 406, and the two groups of grouting ports 406 are aligned when the framework 301 and the upper sealing plate 403 are attached.

[0056] Before the test, the workers need to cooperate with each other to lift the lower sealing plate 402 and cover it on the middle of the base plate 401, so that the lower sealing plate 402 is extruded and contacted on the top of the frost heaving soil layer, and the frost heaving soil layer forms a "V" type interval, then the workers lift away the lower sealing plate 402 and erect the framework 301 on the middle of the base plate 401, so that the framework 301 is closely attached to the top of the "V" type interval formed by the frost heaving soil layer, at this time, the workers cooperate with each other to lift the upper sealing plate 403 and fix it on the top of the framework 301, so that the grouting ports 406 on the two ends of the framework 301 and the upper sealing plate 403 are aligned, then the gypsum slurry is injected into the inside of the framework 301 through the grouting ports 406, so as to fill the framework 301.

[0057] Among them, the top of the framework 301 is symmetrically provided with the handle 305, two bolt rods 306 are threadedly installed between each handle 305 and the side wall of the machine body 1, the top of the machine body 1 is symmetrically provided with the reinforcing rod 307, and the bolt rod 306 penetrates out from the inside of the reinforcing rod 307; after the workers hold the handle 305 and erect the framework 301 on the middle of the base plate 401, the bolt rod 306 is sequentially threaded through the reinforcing rod 307 and the handle 305 and fixed, so as to improve the structural stability of the framework 301, and the bottom of the machine body 1 is provided with the water content sensor 5 for detecting the change state of the water content in the frost heaving experiment process.

[0058] Further, the two ends of the upper sealing plate 403 and the framework 301 are provided with the threaded ports 404, the two groups of threaded ports 404 are aligned and connected with the bolt 405 through the threads when the upper sealing plate 403 and the framework 301 are attached, so as to ensure the sealing property of the framework 301, and the middle of the framework 301 is symmetrically provided with the flow-through groove 407, so as to guide the sealed interval in the inside of the framework 301, and the gypsum slurry can fill the entire framework 301.

[0059] Working principle: before the test, the workers need to cooperate with each other to lift the lower sealing plate 402 and press it on the middle part of the cushion plate 401, so that the lower sealing plate 402 is pressed and contacted with the top of the frost heaving soil layer, and the frost heaving soil layer forms a "V" type interval, then the workers lift the lower sealing plate 402 away, and set the skeleton 301 on the middle part of the cushion plate 401, so that the skeleton 301 closely fits the top of the "V" type interval formed by the frost heaving soil layer, at this time the workers hold the handle 305 to set the skeleton 301 on the middle part of the cushion plate 401, then the bolt rod 306 is sequentially threaded through the reinforcing rod 307 and the handle 305 and fixed, thereby improving the structural stability of the skeleton 301, then the upper sealing plate 403 is lifted and fixed on the top of the skeleton 301, so that the grouting holes 406 at both ends of the skeleton 301 and the upper sealing plate 403 are aligned, then the gypsum slurry is injected into the inside of the skeleton 301 through the grouting holes 406, so as to fill the skeleton 301, after the gypsum solidifies in the inside of the skeleton 301, the upper sealing plate 403 is removed, at this time the workers respectively insert the slide rail pieces 205 into the inside of the positioning grooves 204, so that the distance measuring probes 207 at the bottom of the slide rail pieces 205 respectively abut against the longitudinal sample marks 302 and the transverse sample marks 303, then the workers start the temperature control bin 203, by introducing the cooling medium (low temperature gas, low temperature liquid) into the inside of the temperature control bin 203, the soil layer inside the body 1 is cooled by heat transfer, and the soil layer is cooled at the same time, so that the frost heaving reaction occurs, thereby extruding the longitudinal sample marks 302 and the transverse sample marks 303, so that the longitudinal sample marks 302 and the transverse sample marks 303 overcome the pulling of the banner piece 304 and move outward with a small amplitude, at this time the distance measuring probes 207 on the surface of the longitudinal sample marks 302 and the transverse sample marks 303 are extruded and shrinked, thereby measuring S1 and S2, and observing the depth of the lowest temperature received by the temperature sensing module 202 under the soil layer and H, according to P1=Ef*S1 / H, P2=Ef*S2 / H, the actual frost heaving force distribution of the test point (P1 and P2 are the normal frost heaving force of each point of the simulated lining, S1 is the vertical displacement change amount of the lining, S2 is the vertical displacement change amount of the lining, H is the frost depth of the foundation soil, and Ef is the dynamic elastic modulus of the foundation soil) is obtained.

[0060] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered by the protection scope of the present application.

Claims

1. An experimental device for detecting frost heave in concrete subgrade, comprising a body (1), characterized in that, The body (1) is equipped with a detection mechanism (2). The detection mechanism (2) includes a capacity cavity (201) opened inside the body (1). The capacity cavity (201) is filled with a frost-susceptible soil layer. A temperature sensing module (202) is vertically installed inside the capacity cavity (201). The temperature sensing module (202) is buried inside the frost-susceptible soil layer. A temperature control chamber (203) is installed on the top of the capacity cavity (201). The temperature control chamber (203) is attached to the upper surface of the frost-susceptible soil layer and is used to cool the frost-susceptible soil layer from top to bottom to simulate the development process of the freezing front caused by surface heat dissipation in the natural environment from top to bottom. The top of the testing mechanism (2) is supported by a lining component (3); The outer side of the lining component (3) is equipped with a sealing mechanism (4), which includes a pad (401) fixedly installed on the top of the body (1). After the gypsum sealing treatment is completed, the sealing mechanism (4) is mounted on the outside of the lining component (3), and the frost heave test is carried out on the lining component (3) by the testing mechanism (2). The lining component (3) includes a frame (301) mounted on top of the machine body (1). Longitudinal markers (302) and transverse markers (303) are respectively installed at the middle and both ends of the frame (301) via banners (304). When pressed, the longitudinal markers (302) and transverse markers (303) cause the banners (304) to deform horizontally and vertically, respectively, for breaking and removing the plaster. The upper and lower ends of the longitudinal markers (302) and transverse markers (303) are flush with the outer surface of the frame (301). The interior of the frame (301) is grouted with a plaster layer. Both the mark (302) and the transverse mark (303) are internally threaded with a drive component (3021). A Z-shaped spring (3022) is connected between the drive component (3021) and the longitudinal mark (302). The drive component (3021) is connected to the banner component (304). When the drive component (3021) is struck with a hammer, the drive component (3021) will pull the banner component (304) due to the influence of the threads. This causes the banner component (304) to twist and rotate inward around the drive component (3021) and move longitudinally with a small amplitude as the drive component (3021) moves, thereby applying horizontal and longitudinal shear forces to the plaster layer.

2. The experimental equipment for detecting frost heave of concrete subgrade according to claim 1, characterized in that, The detection mechanism (2) also includes several positioning slots (204) equidistantly arranged on the top of the body (1). Several sets of slide rails (205) are engaged inside the positioning slots (204). A ranging probe (207) is provided at the bottom of each slide rail (205). The ranging probe (207) presses against the lining component (3).

3. The experimental equipment for detecting frost heave of concrete subgrade according to claim 1, characterized in that, The temperature control chamber (203) is installed on the top of the pad (401), the frame (301) is erected in the middle of the pad (401), the bottom of the pad (401) is distributed with a lower sealing plate (402), the lower sealing plate (402) is pressed against the top of the frost-susceptible soil layer, causing the frost-susceptible soil layer to form a "V" shaped section, the top of the frame (301) is fitted with an upper sealing plate (403), the upper sealing plate (403) and the lower sealing plate (402) form a closure between the upper and lower ends of the frame (301), the frame (301) and the upper sealing plate (403) are provided with grouting ports (406) at both ends, when the frame (301) and the upper sealing plate (403) are fitted together, the two sets of grouting ports (406) are aligned.

4. The experimental equipment for detecting frost heave of concrete subgrade according to claim 2, characterized in that, Each of the slide rail components (205) has a universal bracket (206) rotatably mounted on its bottom, and the ranging probe (207) is fixedly mounted on the bottom of the universal bracket (206).

5. The experimental equipment for detecting frost heave of concrete subgrade according to claim 1, characterized in that, The top two ends of the frame (301) are symmetrically equipped with handles (305), and the bottom of the body (1) is equipped with a moisture content sensor (5).

6. The experimental equipment for detecting frost heave of concrete subgrade according to claim 5, characterized in that, Two bolt rods (306) are threaded between each of the grips (305) and the side wall of the body (1).

7. The experimental device for detecting frost heave of concrete subgrade according to claim 6, characterized in that, The top two ends of the body (1) are symmetrically equipped with reinforcing rods (307), and the bolt rods (306) pass through the interior of the reinforcing rods (307).

8. The experimental equipment for detecting frost heave of concrete subgrade according to claim 3, characterized in that, Both ends of the upper sealing plate (403) and the skeleton (301) are provided with threaded openings (404). When the upper sealing plate (403) and the skeleton (301) are fitted together, the two sets of threaded openings (404) are aligned and connected by bolts (405) through threads. The skeleton (301) is provided with flow grooves (407) symmetrically on both sides of the middle part to conduct the sealing area inside the skeleton (301).

9. The method of using the experimental equipment for detecting frost heave of concrete subgrade according to claim 8, characterized in that, Includes the following steps: S1: First, the worker places the lining component (3) inside the inspection mechanism (2) on the machine body (1), and at the same time fixes the sealing mechanism (4) to the outside of the lining component (3). Then, gypsum slurry is poured into the inside of the sealing mechanism (4). After waiting for the gypsum to solidify inside the lining component (3), the sealing mechanism (4) is removed. S2: Then the detection mechanism (2) is started. The detection mechanism (2) cools down the soil layer inside the body (1). At the same time, the soil layer will undergo frost heave reaction and squeeze the outside of the lining component (3). At this time, the detection mechanism (2) is used to detect the frost heave depth of the soil layer, the displacement of the lining component (3) in the transverse direction, and the displacement of the lining component (3) in the longitudinal direction. S3: After the worker completes the inspection, he lifts out the gypsum-containing skeleton (301) and places it on the top of the platform. At this time, the bottom of the longitudinal sample (302) is in contact with the platform. The worker uses a hammer to strike the longitudinal sample (302) of the gypsum layer. The longitudinal sample (302) is under pressure, which will cause the strip (304) to deform, thereby breaking the entire gypsum layer.

Images