Experimental equipment and method for detecting frost heaving of concrete roadbed

Abstract

The invention discloses experimental equipment and method for detecting concrete roadbed frost heaving, and relates to the technical field of lining freezing and thawing experimental equipment.The experimental equipment comprises a machine body, a detection mechanism is arranged in the machine body, the detection mechanism comprises a capacity cavity formed in the machine body, and the capacity cavity is filled with a frost heaving soil layer; a volume cavity is formed in the upper surface of the frost heaving soil layer, a temperature sensing module is vertically mounted in the volume cavity, the temperature sensing module is buried in the frost heaving soil layer, and a temperature control bin is mounted at the top of the volume cavity and attached to the upper surface of the frost heaving soil layer; a lining component is erected on the top of the detection mechanism; a mold sealing mechanism is carried on the outer side of the lining component and comprises a base plate fixedly installed on the top of the machine body. The experimental equipment and method for detecting concrete roadbed frost heaving disclosed by the invention have the effects of multifunctionality, high efficiency and precise data.

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 two ends of the framework and the upper sealing plate are provided with grouting openings, and the two groups of grouting openings 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, causing the surface to be cooled to the freezing point, forming a freezing front and gradually advancing to the deep layer), improving the accuracy and functionality of the equipment.

[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 lining member can be used repeatedly, 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, starts the detection mechanism 2, the detection mechanism 2 cools the soil layer inside the machine body 1, the soil layer is frozen and expanded, and the lining member 3 is extruded, the detection mechanism 2 detects the frozen expansion depth of the soil layer, the lateral displacement of the lining member 3, and the longitudinal displacement of the lining member 3, and the actual frozen expansion 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 frozen expansion forces of the simulation lining, S1 is the vertical displacement change of the lining, S2 is the vertical displacement change of the lining, H is the frozen depth of the base soil, and Ef is the dynamic elastic modulus of the base soil).

[0049] Referring 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 groups of slide rail members 205 are clamped in the positioning grooves 204, and a distance measuring probe 207 is arranged at the bottom of each slide rail member 205 and extruded and contacted with 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, clamps the slide rail members 205 into the positioning grooves 204, and makes the distance measuring probes 207 at the bottom of the slide rail members 205 abut against the top and the sidewall of the lining member 3, then the worker starts the temperature control bin 203, introduces the cooling medium (low-temperature gas or low-temperature liquid) into the temperature control bin 203, cools the soil layer inside the machine body 1 by heat transfer, the soil layer is frozen and expanded, the lining member 3 is extruded, the distance measuring probes 207 on the surface of the lining member 3 are extruded and contracted, S1 and S2 (S1 is the vertical displacement change of the lining, and S2 is the vertical displacement change of the lining) are measured, and the depth of the lowest temperature received by the temperature sensing module 202 under the soil layer is observed, that is, H (H is the frozen depth of the base soil).

[0051] Each slide rail member 205 is rotatably installed with a universal support 206 at the bottom, and the distance measuring probe 207 is fixedly installed at the bottom of the universal support 206, and the worker rotates the universal support 206 to freely adjust the placement angle of the distance measuring probe 207.

[0052] Referring 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 apparatus for detecting frost heaving of a concrete roadbed, comprising a machine body (1), characterized in that, The inside of the machine body (1) is provided with a detection mechanism (2), which comprises a capacity cavity (201) opened in the inside of the machine 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), and the temperature control bin (203) is attached to the upper surface of the frost heaving soil layer. The top of the detection mechanism (2) is provided with a lining member (3); The outer side of the lining member (3) is provided with a mold closing mechanism (4), which comprises a backing plate (401) fixedly installed on the top of the machine body (1); After the lining member (3) is loaded on the outer side of the lining member (3) by the mold closing mechanism (4) and the gypsum sealing film treatment is completed, the lining member (3) is subjected to frost heaving force experiment by the detection mechanism (2); The lining member (3) comprises a framework (301) erected on the top of the machine body (1), longitudinal and transverse sample marks (302) and (303) are respectively drawn and installed on the middle and both ends of the framework (301) through banner members (304), and the longitudinal and transverse sample marks (302) and (303) are pressed to drive the banner members (304) to deform horizontally and vertically, so as to crush and remove the gypsum.

2. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 1, wherein The detection mechanism (2) further comprises a plurality of positioning grooves (204) equidistantly arranged on the top of the machine body (1), a plurality of groups of slide rail members (205) are clamped in the inside of the positioning grooves (204), a distance measuring probe (207) is arranged at the bottom of each slide rail member (205), and the distance measuring probe (207) is in extrusion contact with the lining member (3).

3. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 1, wherein The upper and lower ends of the longitudinal sample mark (302) and the transverse sample mark (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 sample mark (302) and the transverse sample mark (303) are threadedly connected with a driving member (3021), a Z-shaped elastic sheet (3022) is connected between the driving member (3021) and the longitudinal sample mark (302), and the driving member (3021) is connected with the banner member (304).

4. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 3, characterized by, The temperature control bin (203) is installed on the top of the cushion plate (401), the framework (301) is arranged on the middle of the cushion plate (401), the bottom of the cushion plate (401) is provided with a lower sealing plate (402), the lower sealing plate (402) is in extrusion contact with 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 an upper sealing plate (403), the upper sealing plate (403) and the lower sealing plate (402) form a seal on the upper and lower ends of the framework (301), the upper and lower ends of the framework (301) and the upper sealing plate (403) are provided with grouting openings (406), and the two groups of grouting openings (406) are aligned when the framework (301) and the upper sealing plate (403) are attached.

5. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 2, wherein The bottom of each sliding rail piece (205) is rotatably provided with a universal support (206), and the distance measuring probe (207) is fixedly installed at the bottom of the universal support (206).

6. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 3, wherein The top of the framework (301) is symmetrically provided with a handle (305) at the two ends, and the bottom of the machine body (1) is provided with a water content sensor (5).

7. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 6, wherein Two bolt rods (306) are threadedly installed between each handle (305) and the side wall of the machine body (1).

8. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 7, wherein The top of the machine body (1) is symmetrically provided with a reinforcing rod (307) at the two ends, and the bolt rod (306) penetrates the reinforcing rod (307) from the inside to the outside.

9. The experimental apparatus for detecting frost heaving of a concrete roadbed according to claim 4, wherein The upper sealing plate (403) and the framework (301) are provided with threaded openings (404) at the two ends, the two groups of threaded openings (404) are aligned and connected by a bolt piece (405) when the upper sealing plate (403) and the framework (301) are attached, and the middle of the framework (301) is symmetrically provided with a flow-through groove (407) on the two sides to guide the sealed interval in the framework (301).

10. The method of using the experimental apparatus for detecting frost heaving of a concrete subgrade according to claim 9, wherein, The method comprises the following steps: S1: first, the worker places the lining member (3) on the inside of the detection mechanism (2) of the machine body (1), and fixes the mold sealing mechanism (4) on the outside of the lining member (3), then pours the gypsum slurry into the inside of the mold sealing mechanism (4), and after the gypsum solidifies in the inside of the lining member (3), the mold sealing mechanism (4) is removed; S2: then, the detection mechanism (2) is started, the detection mechanism (2) cools the soil layer in the inside of the machine body (1), the soil layer is cooled and at the same time, the frost heaving reaction occurs, and the outside of the lining member (3) is extruded, at this time, the frost heaving depth of the soil layer, the displacement amount of the lining member (3) along the transverse direction, and the displacement amount of the lining member (3) along the longitudinal direction are detected by the detection mechanism (2) respectively; S3: after the worker completes the detection, the framework (301) containing gypsum is lifted out and placed on the top of the platform, at this time, the bottom of the longitudinal marker (302) is in contact with the platform, the worker uses a hammer to knock the longitudinal marker (302) position of the gypsum layer, the longitudinal marker (302) is pressed and drives the strip piece (304) to deform, so as to break the entire gypsum layer.

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