Roadbed soil dynamic resilience modulus testing device

Abstract

The invention relates to the technical field of road construction, and discloses a roadbed soil dynamic resilience modulus testing device which comprises an outer frame, a material gathering hopper arranged in the outer frame and a sample preparation mechanism arranged below the material gathering hopper. The material collecting hopper is in a conical hopper shape with a wide upper part and a narrow lower part; the bottom of the material collecting hopper is a circular discharge pipe orifice; and a valve unit is arranged at the bottom of the discharge pipe orifice. The sample preparation mechanism comprises a sample preparation cylinder arranged under the discharging pipe opening and a quantitative transfer unit located between the sample preparation cylinder and the discharging pipe opening, and the quantitative transfer unit is used for receiving a certain amount of materials and transferring the materials into the sample preparation cylinder. Through the structure, materials can be automatically added into the sample preparation cylinder, and the materials can be conveniently and gradually compacted layer by layer in the sample preparation cylinder, so that the density of a sample is more uniform, and the dynamic resilience modulus test result of roadbed soil is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, in particular to a roadbed soil dynamic rebound modulus test device. Background Art

[0002] The roadbed soil is an elastic-plastic body. Its strength, stiffness and stability are the main components that characterize the bearing capacity of the roadbed. Under the coupling of extremely low negative temperature and dynamic load in the external environment, the stiffness and strength of the roadbed will be greatly reduced, and deformation will occur under the action of dynamic load. Excessive deformation will cause damage to the road surface and reduce its performance, affecting the normal operation of transportation. In order to reflect the strength and stability of the roadbed, Seed first introduced the rebound modulus as an important indicator to characterize its bearing capacity. It represents the ability of the roadbed to recover deformation under instantaneous load. The roadbed rebound modulus is divided into static rebound modulus and dynamic rebound modulus. Among them, the dynamic rebound modulus can better reflect the dynamic characteristics of the roadbed soil under dynamic load.

[0003] At present, the soil is mostly tested using a dynamic and static true triaxial test system, and there are many factors that affect the dynamic modulus of resilience of roadbed soil, which can be mainly divided into the following categories: soil type, physical state of soil, stress history, and test method. The test method mainly includes specimen size, specimen preparation method, load loading frequency, and load loading sequence. For this reason, the present invention proposes a roadbed soil dynamic modulus of resilience test device, which can solve the problems of low specimen preparation efficiency and uneven specimen density distribution in the prior art. Summary of the invention

[0004] In order to solve the technical problems raised in the background technology, the present invention provides a roadbed soil dynamic rebound modulus test device.

[0005] The present invention is implemented by the following technical scheme: a roadbed soil dynamic rebound modulus test device, comprising an outer frame, a polymer hopper arranged in the outer frame and a sample preparation mechanism arranged below the polymer hopper.

[0006] The aggregate hopper is in the shape of a cone hopper which is wide at the top and narrow at the bottom. The bottom of the aggregate hopper is a circular discharge pipe opening. A valve unit is arranged at the bottom of the discharge pipe opening.

[0007] The sample preparation mechanism comprises a sample preparation cylinder arranged directly below the discharge pipe opening, and a quantitative transfer unit located between the sample preparation cylinder and the discharge pipe opening, and the quantitative transfer unit is used to receive a certain amount of material and transfer it to the sample preparation cylinder.

[0008] Through the above scheme, it is convenient to add a certain amount of raw materials into the sample preparation tube each time, so as to facilitate layer-by-layer compaction to finally obtain the sample.

[0009] As a further improvement of the above scheme, the valve unit includes a material plug and a lifting push rod for driving the material plug to rise and fall, wherein: the material plug is a truncated cone-shaped structure that is narrow at the top and wide at the bottom, the annular side wall of the material plug can be in contact with the port of the discharge pipe to block the discharge pipe, and a number of arc-shaped material discharge troughs are also provided on the annular side wall of the material plug, and a circle of material blocking plates is also provided on the annular side wall of the material plug, the lifting push rod is installed on the bottom surface of the gathering hopper, and the output end of the lifting push rod is connected to the material plug.

[0010] Through the above scheme, the discharge port of the discharge pipe opening can be opened and closed automatically.

[0011] As a further improvement of the above scheme, a number of vertically arranged connecting rods are distributed circumferentially on the annular side of the plugger, a sliding sleeve is movably mounted on the outer side of the discharge pipe port, the top ends of the connecting rods are fixed on the sliding sleeves, and the output end of the lifting push rod is connected to a connecting plate, which is connected to the connecting plate and the connecting rod.

[0012] Through the above solution, the lifting push rod can be conveniently used to push the blocker to move up and down.

[0013] As a further improvement of the above scheme, the quantitative transfer unit includes a material transferor and a horizontal push rod, wherein: the material transferor is a horizontally arranged cylindrical structure, one end of the horizontal push rod is connected to the outer frame, the output end of the horizontal push rod is connected to one end of the material transferor, and a certain material cavity is opened on the annular side wall of the material transferor, a weighing module is arranged in the material cavity, and an openable and closable door panel is arranged at the opening of the material cavity.

[0014] The above scheme facilitates quantitative acquisition of raw materials each time, and the material transfer device can be removed to facilitate subsequent compaction of the raw materials in the sample preparation cylinder.

[0015] As a further improvement of the above solution, the plugging device and the sample preparation tube are coaxially arranged, and the diameter of the sample preparation tube is greater than or equal to the bottom diameter of the plugging device, and a temporary plugging unit is installed on the top of the plugging device.

[0016] Through the above scheme, the material plugging device can be used to descend and compact the raw materials in the sample preparation cylinder, and when the material plugging device is working, the raw materials in the aggregate hopper will not leak out.

[0017] As a further improvement of the above scheme, the temporary blocking unit can block the discharge pipe outlet when the plugger moves downward. The temporary blocking unit includes a plugger 2 that can expand and seal in contact with the inner wall of the discharge pipe outlet, and an air supply module. The plugger 2 includes a hard annular sleeve and an annular telescopic airbag installed on the outside of the annular sleeve. A piston rod 1 is coaxially fixed on the top surface of the plugger, and a movable sleeve of the annular sleeve is arranged on the outside of the piston rod 1. The air supply module is used to supply air to the annular telescopic airbag.

[0018] As a further improvement of the above scheme, the air supply module includes a piston sleeve 2 fixed at the bottom of the hopper, a piston 2 cooperating with the piston sleeve 2, and a piston rod 2 fixed to the bottom surface of the piston 2. There is an edge on the outside of the opening of the sample preparation cylinder, and the bottom end of the piston rod 2 can contact the top surface of the edge, so that the gas in the piston sleeve 2 enters the annular telescopic airbag of the occluder 2. A lifting workbench is provided at the bottom of the outer frame, and the sample preparation cylinder is installed on the lifting workbench.

[0019] Through the above scheme, the sample preparation tube can be raised a certain distance before the plugger descends, so that the edge can automatically push the piston rod 2 to drive the piston 2 to squeeze the gas into the annular telescopic airbag of the plugger 2, and finally the inflated annular telescopic airbag of the plugger 2 is used to block the discharge pipe opening.

[0020] As a further improvement of the above scheme, a movable bottom plate is movably arranged at the bottom of the sample preparation tube, a cavity is opened at the bottom of the shell of the sample preparation tube, a plurality of vents connected to the cavity are opened on the bottom surface of the inner wall of the sample preparation tube, an air pipe joint is fixed to the outer wall of the sample preparation tube, and the diameter of the working cavity of the air pipe joint and the piston sleeve 2 is connected through air pipe 1.

[0021] Through the above scheme, it is convenient to use air pressure to lift the movable bottom plate, so as to facilitate the removal of the prepared sample.

[0022] As a further improvement of the above scheme, a piston sleeve is fixed in the hopper, a piston is installed in the piston sleeve, the piston is connected to a piston rod, a plurality of expanding and retracting stirring rods are distributed on the outer wall of the piston sleeve, and the interior of the stirring rod is connected to the working chamber in the piston sleeve.

[0023] As a further improvement of the above scheme, an occluder 1 is also installed on the outside of the piston rod 1. The occluder 1 and the occluder 2 have the same structure, and the annular telescopic airbag in the occluder 1 and the working chamber in the piston sleeve 1 are connected through the trachea 2.

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

[0025] The roadbed soil dynamic rebound modulus test device proposed by the present invention comprises an outer frame, a material hopper arranged in the outer frame, and a sample preparation mechanism arranged below the material hopper. The material hopper is a conical bucket shape that is wide at the top and narrow at the bottom, and the bottom of the material hopper is a circular discharge pipe opening; a valve unit is arranged at the bottom of the discharge pipe opening. The sample preparation mechanism comprises a sample preparation cylinder arranged directly below the discharge pipe opening, a quantitative transfer unit located between the sample preparation cylinder and the discharge pipe opening, and the quantitative transfer unit is used to receive a certain amount of material and transfer it to the sample preparation cylinder.

[0026] Through the above structure, the present invention can automatically add materials into the sample preparation cylinder, and is convenient for compacting the materials layer by layer in the sample preparation cylinder, so that the density of the sample is more uniform and the test result of the dynamic rebound modulus of the roadbed soil is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The overall structural schematic diagram of the dynamic rebound modulus test device provided by the present invention;

[0028] Figure 2 For the present invention Figure 1 A magnified view of point B;

[0029] Figure 3 For the present invention Figure 1 A magnified image of point A;

[0030] Figure 4 It is a partial structural stereogram of the present invention;

[0031] Figure 5 For the present invention Figure 4 A three-dimensional image of the structure from another perspective.

[0032] Description of main symbols:

[0033] In the figure: outer frame 1, polymer hopper 2, sample preparation cylinder 3, edge 301, piston sleeve 1 4, stirring rod 401, piston 1 5, piston rod 1 6, air pipe 1 7, air pipe joint 8, movable bottom plate 9, cavity 10, vent 11, air pipe 2 12, plugger 1 13, plugger 2 14, air pipe 15, sleeve 16, discharge pipe port 17, connecting plate 18, connecting rod 19, material transfer device 20, fixed material cavity 21, plugger 22, material blocking plate 23, discharge chute 24, piston rod 2 25, piston 2 26, piston sleeve 2 27, lifting push rod 29, horizontal push rod 31. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0035] Embodiment 1:

[0036] Reference Figure 1-5 This embodiment provides a roadbed soil dynamic rebound modulus test device, including an outer frame 1, a polymer hopper 2 arranged in the outer frame 1, and a sample preparation mechanism arranged below the polymer hopper 2. The outer frame can be a stainless steel frame, and the outer frame and the polymer hopper 2 can be detachably connected by bolts.

[0037] In this solution, the aggregate hopper 2 is in the shape of a cone that is wide at the top and narrow at the bottom. The bottom of the aggregate hopper 2 is a circular discharge pipe opening 17 . A valve unit is provided at the bottom of the discharge pipe opening 17 .

[0038] The sample preparation mechanism includes a sample preparation cylinder 3 disposed directly below the discharge nozzle 17 , and a quantitative transfer unit located between the sample preparation cylinder 3 and the discharge nozzle 17 , and the quantitative transfer unit is used to receive a certain amount of material and transfer it to the sample preparation cylinder 3 .

[0039] Through the above scheme, it is convenient to add a certain amount of raw materials into the sample preparation tube 3 each time, so as to facilitate layer-by-layer compaction to finally obtain the sample.

[0040] As an optional embodiment of the present invention, the valve unit includes a material blocker 22 and a lifting push rod 29 for driving the material blocker 22 to rise and fall. The lifting push rod 29 can be an electric push rod, wherein: the material blocker 22 is a truncated cone-shaped structure that is narrow at the top and wide at the bottom. The annular side wall of the material blocker 22 can abut against the port of the discharge pipe opening 17 to block the discharge pipe opening 17, and a plurality of arc-shaped discharge troughs 24 are also provided on the annular side wall of the material blocker 22. The discharge trough is used to pass the material. A circle of blocking plates 23 is also provided on the annular side wall of the material blocker 22. The blocking plates 23 can prevent the material from not passing through the discharge trough 24. The lifting push rod 29 is installed on the bottom surface of the hopper 2, and the output end of the lifting push rod 29 is connected to the material blocker 22.

[0041] Through the above solution, it is convenient to automatically open and close the discharge port of the discharge pipe port 17, thereby realizing automatic unloading.

[0042] As an optional embodiment of the present invention, a plurality of vertically arranged connecting rods 19 are distributed circumferentially on the annular side surface of the material blocker 22, a sliding sleeve 16 is movably sleeved on the outer side of the discharge pipe 17, the top ends of the connecting rods 19 are fixed on the sliding sleeve 16, and the output end of the lifting push rod 29 is connected to the connecting plate 18, and the connecting plate 18 is connected to the connecting rod 19. Through the above scheme, it is convenient for the lifting push rod 29 to push the material blocker 22 to be lifted or lowered.

[0043] As an optional embodiment of the present invention, the quantitative transfer unit includes a transfer device 20 and a horizontal push rod 31, wherein: the transfer device 20 is a horizontally arranged cylindrical structure, one end of the horizontal push rod 31 is connected to the outer frame 1, the output end of the horizontal push rod 31 is connected to one end of the transfer device 20, and a certain material cavity 21 is opened on the annular side wall of the transfer device 20, a weighing module is arranged in the material cavity 21, and a door panel that can be opened and closed is arranged at the opening of the material cavity 21. A receiving plate and a weighing sensor for sensing the weight of the material on the receiving plate are arranged in the quantitative cavity 21, and the weighing sensor is electrically connected to the controller, and the controller can control the corresponding operation of the lifting push rod. When the weight of the material in the quantitative cavity 21 reaches the set value, the controller controls the lifting push rod to drive the blocker 22 to rise, thereby blocking it again.

[0044] The above scheme facilitates quantitative acquisition of raw materials each time, and the material transfer device 20 can be removed to facilitate subsequent compaction of the raw materials in the sample preparation cylinder.

[0045] As an optional embodiment of the present invention, the plugging device 22 and the sample preparation tube 3 are coaxially arranged, and the diameter of the sample preparation tube 3 is greater than or equal to the bottom diameter of the plugging device 22 , and a temporary plugging unit is installed on the top of the plugging device 22 .

[0046] Through the above scheme, the material blocker 22 can be used to descend and compact the raw materials in the sample preparation cylinder, and when the material blocker 22 is working, the raw materials in the aggregation hopper 2 will not leak out.

[0047] As an optional embodiment of the present invention, the temporary blocking unit can block the discharge pipe opening 17 when the plugger 22 moves downward. The temporary blocking unit includes a plugger 14 that can expand and seal with the inner wall of the discharge pipe opening 17, and an air supply module. The plugger 14 includes a hard annular sleeve (not marked) and an annular telescopic airbag installed on the outside of the annular sleeve (not marked). A piston rod 6 is coaxially fixed to the top surface of the plugger 22, and the annular sleeve movable sleeve is arranged on the outside of the piston rod 6. The air supply module is used to supply air to the annular telescopic airbag.

[0048] As an optional embodiment of the present invention, the gas supply module includes a piston sleeve 27 fixed at the bottom of the hopper 2, a piston 26 matched with the piston sleeve 27, and a piston rod 25 fixed to the bottom surface of the piston 26. There is an edge 301 on the outside of the opening of the sample preparation tube 3, and the bottom end of the piston rod 25 can contact the top surface of the edge 301, so that the gas in the piston sleeve 27 enters the annular telescopic airbag of the occluder 14. A lifting workbench (not marked) is provided at the bottom of the outer frame 2, and the sample preparation tube 3 is installed on the lifting workbench. The bottom of the lifting workbench is pushed by an electric push rod or a hydraulic rod. The working chamber in the piston sleeve 27 and the annular telescopic airbag of the occluder 14 are connected through the air supply pipe 15.

[0049] Through the above scheme, the sample preparation tube 3 can be raised by one end before the plugging device 22 descends, so that the edge 301 automatically pushes the piston rod 25 to drive the piston 26 to squeeze the gas into the annular telescopic airbag of the plugging device 14, and finally the annular telescopic airbag of the plugging device 14 after expansion is used to block the discharge pipe 17. In this way, the material can be prevented from leaking when the plugging device 22 is working to compact the material.

[0050] As an optional embodiment of the present invention, a movable bottom plate 9 is movably provided at the bottom of the inner part of the sample preparation tube 3, a cavity 10 is provided at the bottom of the shell of the sample preparation tube 3, a plurality of vents 11 connected to the cavity 10 are provided on the bottom surface of the inner wall of the sample preparation tube 3, and an air pipe joint 8 is fixed to the outer wall of the sample preparation tube 3, and the air pipe joint 8 and the working cavity diameter of the piston sleeve 27 are connected through the air pipe 1 7. Through the above scheme, it is convenient to use air pressure to lift the movable bottom plate, so as to facilitate the removal of the prepared sample. An air outlet connected to the air pipe 1 7 is provided on the shell of the piston sleeve 27, and a valve is also provided on the air pipe 1 7 to control the on and off of the gas phase.

[0051] As an optional embodiment of the present invention, a piston sleeve 4 is fixed in the aggregate hopper, a piston 5 is installed in the piston sleeve 4, the piston 5 is connected to the piston rod 6, a plurality of inflatable and retractable stirring rods 401 are distributed on the outer wall of the piston sleeve 4, and the inside of the stirring rod 401 is connected to the working chamber in the piston sleeve 4. Through the above structure, the length of the stirring rod 401 can be changed by utilizing the operation of the piston 5 in the piston sleeve 4, thereby preventing the material in the aggregate hopper 2 from accumulating and failing to descend normally.

[0052] As an optional embodiment of the present invention, an occluder 13 is also installed on the outer side of the piston rod 6. The occluder 13 and the occluder 2 14 have the same structure, and the annular telescopic airbag in the occluder 13 and the working chamber in the piston sleeve 4 are connected through the trachea 2 12.

[0053] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A roadbed soil dynamic rebound modulus test device, It is characterized in that It includes an outer frame, a material collecting hopper arranged in the outer frame, and a sample preparation mechanism arranged below the material collecting hopper; The aggregate hopper is in the shape of a cone that is wide at the top and narrow at the bottom, and the bottom of the aggregate hopper is a circular discharge pipe opening; a valve unit is provided at the bottom of the discharge pipe opening; The sample preparation mechanism comprises a sample preparation cylinder arranged directly below the discharge pipe opening, and a quantitative transfer unit located between the sample preparation cylinder and the discharge pipe opening, and the quantitative transfer unit is used to receive a certain amount of material and transfer it to the sample preparation cylinder.

2. A roadbed soil dynamic rebound modulus test device as claimed in claim 2, It is characterized in that The valve unit includes a material blocker and a lifting push rod for driving the material blocker to rise and fall, wherein: the material blocker is a truncated cone-shaped structure that is narrow at the top and wide at the bottom, the annular side wall of the material blocker can abut against the port of the discharge pipe to block the discharge pipe, and a plurality of arc-shaped material discharge grooves are also provided on the annular side wall of the material blocker, and a circle of material blocking plates is also provided on the annular side wall of the material blocker, the lifting push rod is installed on the bottom surface of the gathering hopper, and the output end of the lifting push rod is connected to the material blocker.

3. A roadbed soil dynamic rebound modulus test device as claimed in claim 3, It is characterized in that The annular side surface of the material blocker is circumferentially distributed with a plurality of vertically arranged connecting rods, a sliding sleeve is movably mounted on the outer side of the discharge pipe port, the top ends of the connecting rods are fixed on the sliding sleeves, the output end of the lifting push rod is connected with a connecting plate, and the connecting plate is connected to the connecting rod.

4. A roadbed soil dynamic rebound modulus test device as claimed in claim 3, It is characterized in that The quantitative transfer unit includes a material transferor and a horizontal push rod, wherein: the material transferor is a horizontally arranged cylindrical structure, one end of the horizontal push rod is connected to the outer frame, the output end of the horizontal push rod is connected to one end of the material transferor, and a certain material cavity is opened on the annular side wall of the material transferor, a weighing module is arranged in the material cavity, and a door panel that can be opened and closed is arranged at the opening of the material cavity.

5. A roadbed soil dynamic rebound modulus test device as claimed in claim 1, It is characterized in that The plugging device and the sample preparation tube are coaxially arranged, and the caliber of the sample preparation tube is greater than or equal to the bottom diameter of the plugging device. A temporary plugging unit is installed on the top of the plugging device.

6. A roadbed soil dynamic rebound modulus test device as claimed in claim 5, It is characterized in that The temporary blocking unit can block the discharge pipe opening when the blocker moves downward. The temporary blocking unit includes a blocker 2 that can expand and seal in contact with the inner wall of the discharge pipe opening, and an air supply module. The blocker 2 includes a hard annular sleeve and an annular telescopic airbag installed on the outside of the annular sleeve. A piston rod 1 is coaxially fixed on the top surface of the blocker, and a movable sleeve of the annular sleeve is arranged on the outside of the piston rod 1. The air supply module is used to supply air to the annular telescopic airbag.

7. A roadbed soil dynamic rebound modulus test device as claimed in claim 6, It is characterized in that The air supply module includes a piston sleeve 2 fixed to the bottom of the hopper, a piston 2 cooperating with the piston sleeve 2, and a piston rod 2 fixed to the bottom surface of the piston 2. An edge is provided on the outer side of the opening of the sample preparation cylinder, and the bottom end of the piston rod 2 can contact the top surface of the edge, so that the gas in the piston sleeve 2 enters the annular telescopic airbag of the occluder 2. A lifting workbench is provided at the bottom of the outer frame, and the sample preparation cylinder is installed on the lifting workbench.

8. A roadbed soil dynamic rebound modulus test device as claimed in claim 1, It is characterized in that A movable bottom plate is movably arranged at the bottom of the sample preparation tube, a cavity is opened at the bottom of the shell of the sample preparation tube, a plurality of vents connected to the cavity are opened on the bottom surface of the inner wall of the sample preparation tube, an air pipe joint is fixed to the outer wall of the sample preparation tube, and the diameter of the air pipe joint and the working cavity of the piston sleeve 2 are connected through the air pipe 1.

9. A roadbed soil dynamic rebound modulus test device as claimed in claim 1, It is characterized in that A piston sleeve is fixed in the aggregate hopper, a piston is installed in the piston sleeve, the piston is connected to a piston rod, a plurality of inflatable and retractable stirring rods are distributed on the outer wall of the piston sleeve, and the inside of the stirring rod is connected to the working chamber in the piston sleeve.

10. A roadbed soil dynamic rebound modulus test device as claimed in claim 1, It is characterized in that The outer side of the piston rod 1 is also equipped with an occluder 1, which has the same structure as the occluder 2, and the annular telescopic airbag in the occluder 1 and the working chamber in the piston sleeve 1 are connected through the trachea 2.

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