Grouting Repair Model Test Device and Experimental Method for Road Internal Diseases

Abstract

The present invention discloses a model test device and an experimental method for grouting repair of internal diseases of roads, belonging to the technical field of grouting repair of internal diseases of roads. The device includes: a mobile gantry reaction frame, a sliding servo hydraulic loading system, a control system, an experimental box, a detection system, and a grouting system. The mobile gantry reaction frame includes columns, a cross beam, longitudinal tracks, and a trolley. The servo hydraulic loading system includes a transverse slide rail, a slider, and a servo hydraulic press. The control system includes a motor and a computer. The experimental box includes a box body, a road structure, a foam board, and a rubber airbag. The grouting system includes a grouting machine, a grouting pipe, and a grouting hose. The detection system includes dial gauges, strain gauges, strain meters, and earth pressure cells. The columns can slide along the longitudinal guide rails in the longitudinal direction of the road, the servo hydraulic press can slide along the transverse slide rails in the transverse direction of the road, and the cross beam can be fixed at different vertical positions, realizing the three-dimensional position adjustment of the loading device and solving the problem of fixed loading position.

Description

Technical Field

[0001] The present invention relates to a grouting repair model test device and an experimental method for internal diseases of roads, belonging to the technical field of grouting repair for internal diseases of roads. Background Art

[0002] Due to the concealment of internal diseases of roads, it is very difficult to detect and control them in the initial stage of the diseases. Once they break out, they will cause great harm to the lives and property safety of the people. Among various road repair methods, grouting repair is fast, avoiding large-scale excavation and filling, having less impact on traffic, and at the same time can better solve the internal diseases of roads, achieving the effect of "treating both the symptoms and the root causes".

[0003] The effect of grouting repair is affected by the type of disease body, the characteristics of the grout, the grouting pressure and the grouting method. At present, many scholars evaluate the grouting effect by studying the strength, diffusion radius, etc. of the grouted body through indoor model grouting experiments to seek guidance for actual projects. Indoor model experiments can strictly control various influencing factors and obtain laws through a large number of experiments, but there are still problems such as fixed loading positions, difficult simulation of vehicle loads, and inaccurate simulation of internal diseases. Summary of the Invention

[0004] The present invention aims to provide a grouting repair model test device and an experimental method for internal diseases of roads to solve the above problems of "fixed loading position, difficult simulation of vehicle loads, and inaccurate simulation of internal diseases".

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A grouting repair model test device for internal diseases of roads, comprising: a movable gantry reaction frame, a servo hydraulic loading system, a control system, an experimental box, a detection system and a grouting system;

[0007] The movable gantry reaction frame includes:

[0008] Columns, vertically arranged;

[0009] Cross beams, horizontally arranged between the two columns, and their two ends are detachably connected to the upper parts of the columns;

[0010] Longitudinal tracks, horizontally arranged directly below the columns, and the length direction thereof is perpendicular to the length direction of the cross beams;

[0011] Carts, arranged at the bottoms of the columns and moving along the longitudinal tracks;

[0012] The servo hydraulic loading system includes:

[0013] A horizontal slide rail is arranged at the bottom of the cross beam, and its length direction is consistent with the length direction of the cross beam;

[0014] A slider is slidably connected to the horizontal slide rail and slides along the horizontal slide rail;

[0015] A servo hydraulic press is inversely connected to the bottom of the slider; the servo hydraulic press includes a hydraulic column, a U-shaped frame and rollers; the front end of the hydraulic column faces downward; the U-shaped frame is connected to the front end of the hydraulic column; the rollers are connected to the open end of the U-shaped frame and have two connection positions with the open end of the U-shaped frame, and the connection line of the two connection positions is parallel to the length direction of the cross beam; the rollers rotate around the connection line of the two connection positions;

[0016] The control system includes:

[0017] A motor drives the trolley;

[0018] A computer controls the rotation speed and steering of the motor;

[0019] The experimental box includes:

[0020] A box body, a cavity structure with an open top, is arranged between the two columns;

[0021] A road structure is filled in the box body and includes subgrade soil, a bottom layer, a base layer and a surface layer from bottom to top;

[0022] A foam board is located in the box body and is arranged between the road structure and the side wall of the box body; it provides a reasonable buffer for the lateral displacement of the road structure, and a thin film is attached to the surface and oil is brushed to increase lubrication and reduce the vertical constraint on the road surface structure.

[0023] A rubber airbag is configured to be pre-buried in the road structure after inflation to simulate diseases and taken out of the road structure after deflation;

[0024] The detection system includes:

[0025] A dial indicator is arranged on the surface of the road structure;

[0026] Strain gauges are arranged on the base layer and the bottom layer of the road structure;

[0027] A strain gauge is connected to the strain gauge;

[0028] Earth pressure cells are buried at different depths of the road structure to detect the stress of the road structure under the action of load;

[0029] The grouting system is configured to grout the diseases.

[0030] According to the embodiments disclosed by the present invention, the longitudinal track includes a C-shaped steel; the opening of the C-shaped steel faces upward, and the wheels of the trolley are located inside the C-shaped steel.

[0031] According to the embodiments disclosed by the present invention, it further includes fixed steel plates; the fixed steel plates are arranged along the length direction of the longitudinal track, located on both sides of the longitudinal track, and are configured to be fixed to the ground.

[0032] According to the embodiments disclosed by the present invention, the trolley is a four-wheel plate-type pulley.

[0033] According to the embodiments disclosed by the present invention, the motor is arranged on both sides of the longitudinal slide rail.

[0034] According to the embodiments disclosed by the present invention, a layer of film is attached between the foam board and the side wall of the box body, and oil is brushed between the film and the side wall of the box body.

[0035] According to the embodiments disclosed by the present invention, screw holes are provided on the column, and the cross beam and the column are connected by bolts.

[0036] The experimental method using the above-mentioned experimental device for grouting repair of internal diseases of roads includes the following steps:

[0037] S1: Preliminary preparation work;

[0038] Determine the size and filler type of the model according to the simulated road grade and similarity ratio, prepare the required road materials, debug the instruments used in the experiment, ensure that the control system and the servo hydraulic loading system work properly, fix the cross beam to an appropriate height, convert the standard axle load into the required pressure according to the similarity ratio, and attach a layer of film to the foam board and brush it with oil for standby;

[0039] S2: Filling and embedding;

[0040] After step S1 is completed, filling is carried out in the box body to form the road structure same as the simulated actual road; meanwhile, the earth pressure cells are buried at different depths of the road structure, the strain gauges are embedded at the bottom of the base course and the bottom course, and the corresponding inflated rubber air bags are buried according to the simulated road diseases, and the rubber tubes of the rubber air bags pass through the pre-embedded grouting pipes.

[0041] S3: Load the road model to study the weakening of the mechanical properties of the road by diseases;

[0042] After the consolidation of the road structure, the gas in the rubber airbag is released, and the deflated rubber airbag is taken out of the road structure through the grouting pipe. The grouting pipe is sealed, the positions of the movable gantry reaction frame and the servo-hydraulic loading system are adjusted, and the road surface above the embedded disease is pressurized through the rollers. When comparing with the normal road surface under pressure, the values of the soil pressure cells, strain gauges, and road surface dial gauges embedded inside are analyzed, and the data is analyzed to study the weakening of the road mechanical properties caused by the disease.

[0043] S4: Grouting repair the disease;

[0044] Connect the upper part of the embedded grouting pipe to the slurry outlet of the grouting system, start grouting, and seal the grouting pipe after the grouting is completed;

[0045] S5: Load the road model to study the improvement of the mechanical properties of the disease road by grouting repair;

[0046] After the grouting body is consolidated, the computer controls the motor to drive the movable gantry reaction frame to move, slide the slider, move the servo-hydraulic press to a predetermined position, and perform static load loading on the road surface at the grouting place through the rollers; compare the values of the soil pressure cells, strain gauges, and road surface dial gauges embedded inside with those of the normal road surface and the disease without grouting treatment, analyze the data, and study the improvement of the road mechanical properties by grouting.

[0047] According to the disclosed embodiments of the present invention, in step S3, the computer controls the motor to rotate forward and backward alternately within the same time, and within each time period, the movable gantry reaction frame moves from one end of the road model to the other end; the servo-hydraulic press applies a reciprocating moving load to the road surface through the rollers to simulate the moving vehicle load.

[0048] According to the disclosed embodiments of the present invention, in step S4, the types of grouting materials, grouting pressure, and grouting volume are used as controllable parameters to study the influence of these parameters on the grouting effect.

[0049] The beneficial effects of the present invention are:

[0050] First, the columns in the movable gantry reaction frame can slide along the longitudinal guide rail (C-shaped steel) in the longitudinal direction of the road, the servo-hydraulic press can slide along the transverse slide rail in the movable gantry reaction frame in the transverse direction of the road through the slider, and the cross beam can be fixed at different vertical positions by bolts through the screw holes on the selected columns, realizing the three-dimensional position adjustment and flexible loading of the loading device, solving the problem of fixed loading position; thus, the position of the disease can be reasonably arranged, saving experimental materials.

[0051] Second, the speed and direction of the motor are controlled by a computer program, so that the mobile gantry reaction frame moves back and forth along the longitudinal guide rail (C-shaped steel) in the longitudinal direction of the road. The servo hydraulic press fixed on it is loaded onto the road surface structure through rollers, simulating the repeatedly applied vehicle load; thus solving the technical problem of the difficulty in simulating vehicle loads.

[0052] 3. Use rubber airbags to simulate diseases. Inflate the airbags during pre-embedding, put a grouting tube on the rubber tube, and open the valve to deflate after the pavement structure filler is solidified. Pull the deflated rubber airbag out of the grouting tube. This solves the technical problem of inaccurate simulation of internal diseases, accurately simulates internal road diseases, and facilitates the next step of grouting repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the main view of a grouting repair model test device for simulating internal road damage provided by an embodiment of the present invention;

[0054] Figure 2 It is a side view schematic diagram of a grouting repair model test device for simulating internal road diseases provided by an embodiment of the present invention;

[0055] Figure 3 2 is a schematic top view of a grouting repair model test device for simulating internal road damage provided by an embodiment of the present invention;

[0056] Figure 4 It is a schematic diagram of the longitudinal rail of the mobile portal reaction frame of the grouting repair model test device for simulating internal road diseases provided by an embodiment of the present invention;

[0057] Figure 5 It is a schematic diagram of simulating internal road diseases by a grouting repair model test device for simulating internal road diseases provided by an embodiment of the present invention;

[0058] Figure 6 Schematic diagram of a rubber airbag of a grouting repair model test device for simulating internal road damage provided by an embodiment of the present invention;

[0059] Among them, 1. fixed steel plate 2, C-shaped steel 4, four-wheel plate pulley 6, spiral rotating rod 7, fixed steel ring 8, column 9, screw hole 10, bolt 11, crossbeam 12, transverse slide rail 13, slider 14, fixer 15, servo hydraulic press 16, hydraulic gauge 17, pressure cylinder 18, U-shaped frame 19, roller 20, foam board 21, surface layer 22, base layer 23, bottom layer 24, roadbed 25, box 28, stiffening rib plate 29, bottom plate 30, motor 31, grouting pipe 32, hollow air bag 33, deaired air bag 34, strain gauge 35, earth pressure box 36, rubber tube 37, micrometer 38, valve 39, grouting hose 40, grouting machine 41, computer. Embodiment

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0061] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present invention can be implemented.

[0062] A model test device for grouting repair of internal diseases of roads, as Figure 1-6 shown, includes: a mobile gantry reaction frame, a sliding servo hydraulic loading system, a control system, an experimental box, a detection system, and a grouting system.

[0063] The mobile gantry reaction frame includes columns 8, a cross beam 11, longitudinal tracks, and a trolley. The columns 8 are vertically arranged; the number of columns 8 can be two, and the two columns 8 are symmetrically arranged on both sides of the experimental box. The cross beam 11 is horizontally arranged between the two columns 8, and the two ends of the cross beam 11 in its length direction (in the horizontal direction) are detachably connected to the upper parts of the columns 8; the connection between the two ends of the cross beam 11 and the columns 8 is a static connection. The longitudinal tracks are horizontally arranged directly below the columns 8, and the length direction of the longitudinal tracks is perpendicular to the length direction of the cross beam 11; the number of longitudinal tracks is two, and the two longitudinal tracks are respectively arranged directly below the two columns 8, and the two longitudinal tracks are parallel. The trolley is arranged at the bottom of the columns 8, and the trolley moves along the longitudinal tracks.

[0064] The cross beam 11 can be welded by four steel plates with a thickness of two centimeters to form a cuboid. The steel plates on the front and back two faces are 3.4 meters long and 0.3 meters wide. Four screw holes 9 are opened at each end of the steel plates on the front and back two faces for fixing with the steel square tube columns 8; the steel plates on the upper and lower two faces are 2.8 meters long and 0.3 meters wide, and the lower bottom steel plate is connected to the transverse slide rail 12 in the servo hydraulic loading system.

[0065] The columns 8 can be welded by four steel plates with a thickness of two centimeters, a length of 1.7 meters, and a width of 0.3 meters to form a cuboid. Five rows of screw holes 9 are opened at the connection positions of the front and back two faces with the cross beam 11, two in each row, for fixing with the steel square tube cross beam 11 with bolts 10, and for conveniently adjusting the up and down positions of the cross beam 11. Two through screw holes 9 through which the screw rotary rod 6 can pass are opened at the bottom.

[0066] A bottom plate 29 may be provided at the bottom of the upright column 8. The bottom plate 29 is 0.6 meters long, 0.3 meters wide, and 2 centimeters thick. The bottom plate 29 is welded to the bottom of the upright column 8, and a right-angled triangular stiffening rib plate 28 is provided at each of the four corners of the upright column 8. Screw holes 9 are opened at both ends, and a trolley is fixed by bolts 10. The trolley may be a four-wheel plate trolley 4.

[0067] The longitudinal guide rail may adopt a C-shaped steel 2. The C-shaped steel 2 is 3 meters long, and its external dimensions are: 10 centimeters high and 30 centimeters wide. The opening of the C-shaped steel 2 faces upward, allowing the trolley (four-wheel plate trolley 4) to move longitudinally along the road model therein. Fixed steel plates 1 may be provided on both sides in the length direction of the C-shaped steel 2; the fixed steel plates 1 are symmetrically welded to both sides of the C-shaped steel 2 and fixed to the bottom surface by expanding screws to transmit the reaction force during loading to the ground.

[0068] The servo hydraulic loading system includes a transverse slide rail 12, a slider 13, and a servo hydraulic press 15. The transverse slide rail 12 is provided at the bottom of the cross beam 11, and the length direction of the transverse slide rail 12 is the same as the length direction of the cross beam 11; that is, the transverse slide rail 12 is horizontally arranged along the bottom of the cross beam 11, and both ends of the transverse slide rail 12 are close to or in contact with the upright column 8. The slider 13 is slidably connected to the transverse slide rail 12, and the slider 13 slides horizontally along the transverse slide rail 12. The servo hydraulic press 15 is inversely connected to the bottom of the slider 13; the connection between the servo hydraulic press 15 and the bottom of the slider 13 is a static connection. Specifically, the connection between the servo hydraulic press 15 and the bottom of the slider 13 may be a fixed connection, and the fixed connection between the servo hydraulic press 15 and the bottom of the slider 13 may be achieved through a fixator 14; the servo hydraulic press 15 slides horizontally along the transverse slide rail 12 driven by the slider 13, that is, the servo hydraulic press 15 slides horizontally along the road model driven by the slider 13.

[0069] The servo hydraulic press 15 includes a hydraulic column, a U-shaped frame 18, and rollers 19. The front end of the hydraulic column faces downward; the U-shaped frame 18 is connected to the front end of the hydraulic column; the rollers 19 are movably connected to the open end of the U-shaped frame 18, and there are two connection positions between the rollers 19 and the open end of the U-shaped frame 18. The connection line of the two connection positions is parallel to the length direction of the cross beam 11; the rollers 19 rotate around the connection line of the two connection positions. That is, the servo hydraulic press 15 is pressurized by a pressure cylinder 17, and the hydraulic pressure gauge 16 obtains the pressure value. The front end of the hydraulic column of the servo hydraulic press 15 is replaced with rollers 19 and the U-shaped frame 18 to simulate the dynamic load of the wheel.

[0070] The control system includes a motor 30 and a computer 41. The motor 30 drives the trolley; the computer 41 controls the speed and direction of the motor 30. Specifically, the number of the motors 30 can be two, and one motor 30 can be fixed at each of the two C-shaped steels 2. The control system can also include a spiral rod 6; one end of the spiral rod 6 passes through the screw hole 9 of the steel square tube column 8, and is driven to rotate by the motor 30, and the other end of the spiral rod 6 rotates freely in the fixed steel ring 7. The computer 41 controls the speed and direction of the motor 30 to drive the spiral rod 6 to rotate, thereby realizing the longitudinal movement of the mobile portal reaction frame along the road.

[0071] The test box includes a box 25, a road structure, a foam board 20 and a rubber airbag. The box 25 is a cavity structure with an open top, and the box 25 is arranged between the two uprights 8. The road structure is filled in the box 25, and the road structure includes a roadbed 24 soil, a bottom layer 23, a base layer 22, and a surface layer 21 from bottom to top; different filling materials can be selected according to the road grade to be simulated, and compacted layer by layer as the road structure; and a detection device, a rubber airbag, and a grouting pipe 31 are pre-embedded in the road structure. The foam board 20 is located in the box 25, and the foam board 20 is arranged between the road structure and the side wall of the box 25; it provides a reasonable buffer for the lateral displacement of the road structure. In order to reduce the vertical constraint on the pavement structure, a thin film can be attached to the surface of the foam board 20 and between the foam board 20 and the side wall of the box 25, and oil can be applied to increase lubrication. The rubber airbag has a ventilated rubber tube 36, the bottom of the rubber tube 36 is connected to the rubber airbag, and a valve 38 is provided at the top. The shape and size of the airbag are selected according to the simulated disease. The rubber airbag is inflated and embedded in the road structure (hollow airbag 32) to simulate the disease, and the rubber airbag is deflated (deflated airbag 33) and taken out from the road structure.

[0072] The grouting system may include a grouting machine 40, a grouting pipe 31 and a grouting hose 39. The grouting pipe 31 is a steel pipe with a spiral interface at the top, the top of the grouting pipe 31 is connected to the grouting hose 39, and the bottom of the grouting pipe 31 penetrates deep into the disease. One end of the grouting hose 39 is connected to the top of the grouting pipe 31, and the other end is connected to the grouting outlet of the grouting machine 40.

[0073] The detection system includes a micrometer 37, a strain gauge 34, a strain gauge and an earth pressure box 35. The micrometer 37 is set on the surface of the road structure to detect the settlement of the road under the load and the uplift of the road surface caused by grouting. The strain gauge 34 is set at the bottom of the base layer 22 and the bottom layer 23 of the road structure, and the strain gauge is connected to the strain gauge 34 to detect the tensile stress of the base under the load. The earth pressure box 35 is buried at different depths of the road structure to detect the stress of the road structure under the load.

[0074] An experimental method for a grouting repair model test device for internal road damage, characterized in that it comprises the following steps:

[0075] S1: Preliminary preparation work;

[0076] S2: Filling and pre-burial;

[0077] S3: Load the road model and study the weakening of the road mechanical properties caused by diseases;

[0078] S4: Grouting repair the diseases;

[0079] S5: Load the road model and study the improvement of the mechanical properties of the diseased road after grouting repair.

[0080] S1: Preliminary preparation work;

[0081] Before starting the experiment, determine the size and filler type of the model according to the simulated road grade and similarity ratio, prepare the required road materials, debug the instruments used in the experiment, ensure that the control system and the servo hydraulic loading system work properly, fix the cross beam 11 to an appropriate height, convert the standard axle load into the required pressure according to the similarity ratio, and attach a layer of thin film and brush oil to the foam board 20 for standby.

[0082] S2: Filling and pre-burial;

[0083] After the preliminary preparation work in step S1 is completed, carry out filling in the box body 25 to form the road structure same as the simulated actual road. When carrying out filling in the box body 25, select the same type of subgrade soil as the subgrade 24 of the simulated actual road for the subgrade 24, fill and compact the soil layer by layer from bottom to top, and keep the compaction degree and moisture content consistent with the simulated actual road. To ensure the compaction degree, compact once every 10 cm of soil filling. While carrying out filling in the box body 25, bury the soil pressure cells 35 at different depths of the road structure, pre-bury the strain gauges 34 at the bottom of the base course 22 and the bottom layer 23, and bury the corresponding inflated rubber air bags according to the simulated road diseases. The rubber hose of the rubber air bag passes through the pre-buried grouting pipe 31. The debonding disease generally occurs between the layers of each structural layer. After the filling of the bottom layer 23 is completed, inflate the flat deaeration air bag 33 (the rubber air bag before inflation) and place it at the predetermined position, and the rubber hose passes through the pre-buried grouting pipe 31, and then carry out the upper layer filling.

[0084] S3: Load the road model and study the weakening of the road mechanical properties caused by diseases;

[0085] After the road structure is consolidated, open the valve 38 of the airbag rubber tube to release the gas in the rubber airbag, and take out the deflated rubber airbag from the road structure through the grouting pipe 31. Seal the buried grouting pipe 31 with a rubber plug, adjust the positions of the movable gantry reaction frame and the servo hydraulic loading system, and apply pressure to the road surface above the embedded disease through the roller 19. Compare the values of the internal embedded earth pressure cell 35, strain gauge 34 and road surface dial gauge 37 when the normal road surface is pressurized, analyze the data, and study the weakening of the disease on the mechanical properties of the road.

[0086] Slide the slider 13 to move the servo hydraulic press 15 to a predetermined position, lock the fixator 14, and the computer 41 program controls the motor 30 to rotate forward and backward alternately at a certain speed within the same time. In each time period, the gantry reaction frame can be driven by the screw rod 6 to move from one end of the road model to the other end. The servo hydraulic press 15 applies a reciprocating moving load to the road surface through the roller 19 to simulate the moving vehicle load. Compare the settlement values of the road surface dial gauge 37 when the normal road surface is pressurized, analyze the data, and study the weakening of the disease on the mechanical properties of the road.

[0087] S4: Grout and repair the disease;

[0088] Pull out the rubber plug on the upper part of the embedded grouting pipe 31 and connect the spiral interface to the grouting hose 39 of the grouting machine 40. Start the grouting machine 40 to start grouting. After the grouting is completed, remove the grouting hose 39 and seal the grouting pipe 31 with a rubber plug again to prevent slurry leakage. The type of grouting material, grouting pressure, and grouting volume are used as controllable parameters to study the influence of these factors on the grouting effect.

[0089] S5: Load the road model to study the improvement of the mechanical properties of the disease road after grouting repair;

[0090] After the grouting body is consolidated, the computer 41 controls the motor 30 to drive the movable gantry reaction frame to move. Slide the slider 13 to move the servo hydraulic press 15 to a predetermined position, and apply static load to the road surface at the grouting place through the roller 19. Compare the values of the internal embedded earth pressure cell 35, strain gauge 34 and road surface dial gauge 37 when the normal road surface and the disease are not grouted, analyze the data, and study the improvement of the mechanical properties of the road by grouting.

[0091] Slide the slider 13 to move the servo hydraulic press 15 to a predetermined position, lock the fixator 14, and the computer 41 programs to control the motor 30 to rotate forward and backward alternately at a certain speed within the same time. Within each time period, the gantry reaction frame can be driven by the screw rod 6 to move from one end of the road model to the other end. The servo hydraulic press 15 applies a reciprocating moving load to the road surface through the rollers 19 to simulate the moving vehicle load. Compare the settlement values of the road surface dial gauge 37 during normal road surface pressurization, analyze the data, and study the improvement of the road mechanical properties by grouting.

[0092] Although the specific implementation manners of the present invention have been described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications or deformations that can be made without creative labor on the basis of the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. The grouting repair model test device for internal diseases of roads is characterized in that, Including: A mobile gantry reaction frame, a servo hydraulic loading system, a control system, an experimental box, a detection system, and a grouting system; The mobile gantry reaction frame includes: Columns, vertically arranged, with the bottom plate welded to the bottom of the columns, and a right-angled triangular stiffening rib plate is provided at each of the four corners of the columns. Screw holes are opened at both ends, and the trolley is fixed by bolts; A cross beam, horizontally arranged between the two columns, and its two ends are detachably connected to the upper parts of the columns; A longitudinal track, horizontally arranged directly below the columns, and its length direction is perpendicular to the length direction of the cross beam; The longitudinal track includes C-shaped steel; The C-shaped steel has an upward opening, and the wheels of the trolley are located inside the C-shaped steel, allowing the trolley to move longitudinally along the road model; A trolley, arranged at the bottom of the columns, and moving along the longitudinal track; The servo hydraulic loading system includes: A transverse slide rail, arranged at the bottom of the cross beam, and its length direction is the same as the length direction of the cross beam; A slider, slidably connected to the transverse slide rail, and sliding along the transverse slide rail; A servo hydraulic press, inversely connected to the bottom of the slider; The servo hydraulic press is fixedly connected to the bottom of the slider through a fixture; The servo hydraulic press slides horizontally along the transverse slide rail driven by the slider, that is, the servo hydraulic press slides horizontally along the road model driven by the slider; The servo hydraulic press includes a hydraulic column, a U-shaped frame, and rollers; The front end of the hydraulic column faces downward; The U-shaped frame is connected to the front end of the hydraulic column; The rollers are connected to the open end of the U-shaped frame and have two connection positions with the open end of the U-shaped frame. The line connecting the two connection positions is parallel to the length direction of the cross beam; The rollers rotate around the line connecting the two connection positions; The control system includes: A motor, driving the trolley; A computer, controlling the rotation speed and steering of the motor; The control system also includes a screw rotating rod; One end of the screw rotating rod passes through the screw hole of the steel square tube column and is driven to rotate by the motor. The other end of the screw rotating rod rotates freely in the fixed steel ring. By controlling the rotation speed and steering of the motor by the computer, the screw rotating rod is driven to rotate, realizing the longitudinal movement of the mobile gantry reaction frame along the road; The experimental box includes: A box body, a cavity structure with an open top, arranged between the two columns; A road structure, filled in the box body, including subgrade soil, bottom layer, base layer, and surface layer from bottom to top; A foam board, located inside the box body, arranged between the road structure and the side wall of the box body; Providing a reasonable buffer for the lateral displacement of the road structure, with a thin film attached to the surface and oil brushed to increase lubrication, reducing the vertical constraint on the road surface structure; A rubber airbag, configured to be embedded in the road structure after inflation to simulate diseases and taken out of the road structure after deflation; The detection system includes: A dial indicator, arranged on the surface of the road structure; Strain gauges, arranged on the base layer and bottom layer of the road structure; Strain gauges, connecting the strain gauges; Earth pressure cells, buried at different depths of the road structure to detect the stress of the road structure under the action of load; The grouting system is configured to grout the diseases.

2. The grouting repair model test device for internal diseases of roads according to claim 1, characterized in that It further includes a fixing steel plate; the fixing steel plate is arranged along the length direction of the longitudinal track, located on both sides of the longitudinal track, and is configured to be fixed to the ground.

3. The grouting repair model test device for internal diseases of roads according to claim 1, characterized in that The trolley is a four-wheel plate pulley.

4. The grouting repair model test device for internal diseases of roads according to claim 1, characterized in that, The motors are arranged on both sides of the longitudinal track.

5. The grouting repair model test device for internal diseases of roads according to claim 1, characterized in that, A layer of film is attached between the foam board and the side wall of the box body, and oil is brushed between the film and the side wall of the box body.

6. The grouting repair model test device for internal diseases of roads according to claim 1, characterized in that, Screw holes are provided on the upright post, and the cross beam is connected to the upright post by bolts.

7. The experimental method of the grouting repair model test device for internal diseases of the road according to any one of claims 1-6, characterized in that, It includes the following steps: S1: Preliminary preparation work; Determine the size and filler type of the model according to the simulated road grade and similarity ratio, prepare the required road materials, debug the instruments used in the experiment, ensure that the control system and the servo hydraulic loading system work properly, fix the cross beam to an appropriate height, convert the standard axle load into the required pressure according to the similarity ratio, attach a layer of film to the foam board, brush oil, and reserve for use; S2: Filling and embedding; After step S1 is completed, filling is carried out in the box body to form the road structure same as the simulated actual road; meanwhile, soil pressure cells are buried at different depths of the road structure, strain gauges are embedded at the bottoms of the base course and the bottom layer, and corresponding inflated rubber air bags are buried according to the simulated road diseases, and the rubber tubes of the rubber air bags pass through the pre-embedded grouting pipes; S3: Load the road model to study the weakening of the road mechanical properties caused by diseases; After the road structure is consolidated, release the gas in the rubber air bag, take out the deflated and soft rubber air bag from the road structure through the grouting pipe, seal the grouting pipe, adjust the positions of the movable gantry reaction frame and the servo hydraulic loading system, apply pressure to the road surface above the pre-embedded disease through the rollers, compare the values of the internally pre-embedded soil pressure cells, strain gauges and the road surface dial gauges when the normal road surface is pressurized, analyze the data, and study the weakening of the road mechanical properties caused by diseases; S4: Grout and repair the diseases; Connect the upper part of the pre-embedded grouting pipe to the slurry outlet of the grouting system, start grouting, and seal the grouting pipe after grouting ends; S5: Load the road model to study the improvement of the mechanical properties of the disease road by grouting repair; After the grouting body is consolidated, the computer controls the motor to drive the movable gantry reaction frame to move, slide the slider, move the servo hydraulic press to a predetermined position, and apply static load to the road surface at the grouting place through the rollers; compare the values of the internally pre-embedded soil pressure cells, strain gauges and the road surface dial gauges of the normal road surface and the disease road without grouting treatment, analyze the data, and study the improvement of the road mechanical properties by grouting.

8. The experimental method according to claim 7, characterized in that, In step S3, the computer controls the motor to rotate forward and backward alternately within the same time, and within each time period, the movable gantry reaction frame moves from one end of the road model to the other end; the servo hydraulic press applies a reciprocating moving load to the road surface through the rollers to simulate the moving vehicle load.

9. The experimental method according to claim 7, wherein In step S4, the types of grouting materials, grouting pressure, and grouting volume are used as controllable parameters to study the influence of these parameters on the grouting effect.

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