A ground permeability detection device for road maintenance

Abstract

The present application relates to the technical field of detection device, specifically relates to a kind of ground permeability detection device for highway maintenance, including detection support, inner fence, outer fence and baffle ring.Inner fence is arranged along vertical direction and located in the lower end of detection support, and the detection space is defined between inner fence, detection support and ground.The outer fence is rotatably installed in the lower end of baffle ring, and the coating space is defined between detection support, inner fence, outer fence and baffle ring.A kind of ground permeability detection device for highway maintenance of the present application is cooperated by setting detection support, inner fence, outer fence and baffle ring, when coating sealant, automatic coating mode is adopted instead of manual coating, the coating area is large, and the efficiency is high, and in the whole coating process, the detection space and coating space are separated from each other by inner fence, the sealant in coating space can be prevented from entering the detection space, and the accuracy of subsequent detection is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection devices, in particular to a ground permeability detection device for highway maintenance. BACKGROUND

[0002] When performing highway maintenance, ground permeability is one of the key indicators for measuring the quality and durability of the highway pavement. Accurate detection of ground permeability helps to discover early-stage pavement diseases in a timely manner, take targeted maintenance measures, and prolong the service life of the highway. Currently, the detection technology for highway ground permeability is mainly based on the principle of water infiltration, which measures the penetration depth or penetration volume of water on the ground within a certain period of time to evaluate the permeability.

[0003] The detection device in the prior art needs to seal the annular area outside the detection area before detection. When sealing the annular area, the prior art usually adopts the manual smearing of sealing material. However, it is difficult to ensure the uniformity and sealing performance of the smearing when manually smearing the sealing material. Moreover, once the sealing material enters the detection area during smearing, it will change the physical properties of the detection area, interfere with the normal infiltration process of water, and cause deviation in the detection data, which cannot accurately reflect the true permeability of the pavement. In addition, if the sealing effect is found to be poor after the initial smearing, secondary coating is required, which further increases the time and labor costs. SUMMARY

[0004] The present application provides a ground permeability detection device for highway maintenance to solve the problem of poor uniformity and sealing performance of the manually smeared sealing material in the prior art detection device, and the problem of the sealing material easily entering the detection area and affecting the detection results.

[0005] The ground permeability detection device for highway maintenance of the present application adopts the following technical scheme: a ground permeability detection device for highway maintenance, comprising a detection support, an inner baffle, an outer baffle, and a baffle ring; the inner baffle is arranged in the vertical direction and located at the lower end of the detection support, and the inner baffle, the detection support, and the ground define a detection space; a water container is arranged on the detection support and communicates with the detection space; the baffle ring is arranged at the lower end of the detection support and located outside the inner baffle, and the detection support and the baffle ring can move relative to each other in the vertical direction; the outer baffle is rotatably installed at the lower end of the baffle ring, the outer baffle is coaxial with the inner baffle, and the lower end surface of the outer baffle and the lower end surface of the inner baffle are located on the same horizontal plane, and the detection support, the inner baffle, the outer baffle, and the baffle ring define a smearing space; a material containing cavity is formed in the baffle ring and communicates with the smearing space; a plurality of downward pressing blocks are arranged on the detection support around the vertical direction, the downward pressing blocks are located above the material containing cavity, and the downward pressing blocks can move downward into the material containing cavity and slide sealingly with the material containing cavity.

[0006] Further, the retaining ring is uniformly provided with a plurality of material containing barrels in the vertical direction, the material containing cavity is defined by the space inside the plurality of material containing barrels, the material containing barrels are provided in one-to-one correspondence with the lower pressing blocks, each lower pressing block is located above the corresponding material containing barrel, and the lower pressing block can move downward to extend into the material containing barrel and slide to seal the material containing barrel.

[0007] Further, the lower ends of the inner and outer retaining rings are provided with gaskets, the gaskets are made of rubber and have elasticity.

[0008] Further, a plurality of return holes are formed in the detection support, the return holes pass through the detection support in the vertical direction and communicate with the coating space.

[0009] Further, the detection support is provided to be rotatable in the vertical direction, and the retaining ring can rotate synchronously with the detection support; the retaining ring can rotate in the vertical direction relative to the outer retaining ring and can move synchronously with the outer retaining ring; the detection support is connected with the inner retaining ring through an adjusting retaining ring, and the adjusting retaining ring is threadedly connected with the inner retaining ring.

[0010] Further, the adjusting retaining ring is provided with a first smooth section and a first threaded section in the vertical direction in sequence on the outer circumferential wall surface, the first smooth section is located above the first threaded section; the inner circumferential wall surface of the inner retaining ring is provided with a second smooth section and a second threaded section in the vertical direction in sequence, the second smooth section is located below the second threaded section, and the first threaded section is threadedly connected with the second threaded section in the initial state.

[0011] Further, the detection support and the retaining ring are connected through a first elastic member, and the adjusting retaining ring and the inner retaining ring are connected through a second elastic member, and the first elastic member and the second elastic member are arranged in the vertical direction.

[0012] Further, the lower pressing block is installed on the detection support through a third elastic member, and the third elastic member is arranged in the vertical direction.

[0013] Further, each lower pressing block is provided with an adjusting barrel, a partition plate is arranged in the adjusting barrel, the adjusting barrel is divided into an upper cavity and a lower cavity by the partition plate, the lower pressing block and the third elastic member are located in the lower cavity of the adjusting barrel, the detection support is uniformly provided with a plurality of supporting arms in the vertical direction, the supporting arms are provided in one-to-one correspondence with the adjusting barrels, the supporting arms are installed in the upper cavity of the adjusting barrel through a fourth elastic member, and the fourth elastic member is arranged in the vertical direction.

[0014] Further, the detection support is provided with an exhaust valve, and the exhaust valve communicates with the detection space.

[0015] The beneficial effects of the present application are: the ground permeability detection device for highway maintenance provided by the present application is provided with a detection support, an inner baffle, an outer baffle and a baffle ring, and when the sealing material is applied, the automatic application mode is adopted instead of manual application, the application area is large and the efficiency is high, and during the whole application process, the detection space and the application space are separated from each other by the inner baffle, so that the sealing material in the application space cannot enter the detection space, and the accuracy of subsequent detection is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 FIG. 1 is a schematic diagram of the overall structure of an embodiment of the ground permeability detection device for highway maintenance of the present application;

[0018] Figure 2 FIG. 2 is a sectional view of the overall structure of an embodiment of the ground permeability detection device for highway maintenance of the present application;

[0019] Figure 3 FIG. 3 is an enlarged view of A in FIG. 1; Figure 2

[0020] FIG. 4 is an enlarged view of B in FIG. 1; Figure 4 Figure 2 FIG. 5 is an enlarged view of C in FIG. 1;

[0021] Figure 5 Figure 2 FIG. 6 is an enlarged view of D in FIG. 1.

[0022] Figure 6 FIG. 7 is a schematic diagram of the overall structure of another embodiment of the ground permeability detection device for highway maintenance of the present application; Figure 2 FIG. 8 is a sectional view of the overall structure of another embodiment of the ground permeability detection device for highway maintenance of the present application;

[0023] In the drawings: 100, detection support; 110, water containing cylinder; 111, support frame; 112, valve switch; 113, return hole; 114, fine tube; 120, lower pressing block; 121, third elastic member; 130, adjusting baffle; 140, adjusting cylinder; 141, fourth elastic member; 150, support arm; 160, exhaust valve; 200, inner baffle; 210, second elastic member; 300, outer baffle; 310, rotating seat; 320, end cover; 330, gasket; 400, baffle ring; 410, first elastic member; 420, material containing cylinder; 500, detection space; 600, application space; 700, counterweight; 701, accommodation hole. DETAILED DESCRIPTION ​​

[0024] 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 a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0025] An embodiment of a ground permeability detection device for road maintenance according to the present application is shown in Figures 1 to 6

[0026] The ground permeability detection device for road maintenance comprises a detection support 100, an inner baffle 200, an outer baffle 300 and a baffle ring 400. The inner baffle 200 is arranged along the vertical direction and located at the lower end of the detection support 100. The inner baffle 200, the detection support 100 and the ground define a detection space 500. The detection support 100 is provided with a water container 110, which is in communication with the detection space 500. The baffle ring 400 is arranged at the lower end of the detection support 100 and located outside the inner baffle 200. The detection support 100 and the baffle ring 400 can move relatively in the vertical direction. The outer baffle 300 is rotatably installed at the lower end of the baffle ring 400. The outer baffle 300 is coaxial with the inner baffle 200, and the lower end surface of the outer baffle 300 and the lower end surface of the inner baffle 200 are located at the same horizontal plane, so that the lower end surface of the outer baffle 300 and the lower end surface of the inner baffle 200 can both abut against the ground. The detection support 100, the inner baffle 200, the outer baffle 300 and the baffle ring 400 define a smearing space 600. The baffle ring 400 is provided with a material containing cavity, which is in communication with the smearing space 600. The detection support 100 is provided with a plurality of downward pressing blocks 120 around the vertical direction. The downward pressing blocks 120 are located above the material containing cavity and can move downward into the material containing cavity and slide sealingly with the material containing cavity.

[0027] Specifically, the water container 110 is made of transparent organic glass, and the water container 110 is provided with a scale. The water container 110 is connected with the detection support 100 through a support frame 111. The water container 110 is provided with a thin tube 114 at the lower end, which penetrates the detection support 100 downward along the vertical direction and is in communication with the detection space 500. The thin tube 114 is provided with a valve switch 112. When the valve switch 112 is opened, water is allowed to enter the detection space 500. When the valve switch 112 is closed, water is restricted from entering the detection space 500.

[0028] ​The embodiment is characterized in that the detection support 100, the inner surrounding barrier 200, the outer surrounding barrier 300 and the barrier ring 400 are cooperated, when the ground permeability is detected, the sealing material is first installed in the material containing cavity, then the detection device is placed on the ground by randomly selecting the detection point on the ground, then the detection support 100 is moved downward relative to the barrier ring 400, the downward movement of the detection support 100 drives the downward movement of the pressing block 120 synchronously, the downward extrusion of the pressing block 120 on the sealing material enables the sealing material to enter the smearing space 600 from the material containing cavity, and the smearing space 600 is sealed. Then the water in the water containing cylinder 110 is injected into the detection space 500, and the permeability is evaluated by measuring the penetration depth or the penetration amount of the water on the ground within a certain time.

[0029] When the sealing material is smeared, the automatic smearing mode is adopted instead of manual smearing, the smearing area is large and the efficiency is high, and during the whole smearing process, the detection space 500 and the smearing space 600 are separated from each other by the inner surrounding barrier 200, which can prevent the sealing material in the smearing space 600 from entering the detection space 500, and improve the accuracy of subsequent detection.

[0030] In a further embodiment, a plurality of material containing cylinders 420 are uniformly distributed around the vertical direction on the barrier ring 400, the material containing cavity is defined by the space inside the plurality of material containing cylinders 420, the material containing cylinder 420 is arranged one by one with the pressing block 120, and each pressing block 120 is located above the corresponding material containing cylinder 420. The pressing block 120 can move downward into the material containing cylinder 420 and slide with the material containing cylinder 420.

[0031] In a further embodiment, the detection support 100 is arranged to rotate around the vertical direction, and the barrier ring 400 can rotate synchronously with the detection support 100. The barrier ring 400 can rotate around the vertical direction relative to the outer surrounding barrier 300 and can move synchronously with the outer surrounding barrier 300. The detection support 100 is connected to the inner surrounding barrier 200 through the adjusting surrounding barrier 130, and the adjusting surrounding barrier 130 is threadedly connected to the inner surrounding barrier 200.

[0032] Specifically, a plurality of sliding grooves are formed on the outer peripheral wall surface of the detection support 100 around the vertical direction, the sliding grooves are arranged along the vertical direction, a plurality of sliding keys are arranged on the inner peripheral wall surface of the barrier ring 400 around the vertical direction, the sliding keys are arranged one by one corresponding to the sliding grooves, and the sliding grooves and the corresponding sliding keys are in sliding cooperation, so that the detection support 100 and the barrier ring 400 can move relative to each other in the vertical direction, and the detection support 100 and the barrier ring 400 can rotate synchronously.

[0033] The outer periphery block 300 is provided with a rotating groove, which is an annular groove coaxially arranged with the outer periphery block 300. The outer periphery block 300 is provided with a rotating protrusion around the vertical direction, which is in rotating cooperation with the rotating groove, so that the blocking ring 400 can rotate around the vertical direction relative to the outer periphery block 300 and can move synchronously with the outer periphery block 300.

[0034] Further, the inner periphery block 200 and the outer periphery block 300 are both provided with a gasket 330. The gasket 330 is made of rubber and has elasticity. The gasket 330 can abut against the ground. The gasket 330 increases the friction between the inner periphery block 200 and the outer periphery block 300 and the ground.

[0035] Specifically, the outer periphery block 300 includes a rotating seat 310 and an end cover 320. The rotating groove is arranged on the rotating seat 310, and the end cover 320 is fixed to the rotating seat 310 by bolts. The gasket 330 is installed at the lower end of the rotating seat 310.

[0036] In use, the detection support 100 is manually rotated, and the detection support 100 drives the adjusting surrounding block 130 and the blocking ring 400 to rotate synchronously. Since the inner periphery block 200 and the outer periphery block 300 abut against the ground and have a large friction with the ground, the inner periphery block 200 and the outer periphery block 300 remain in a relatively static state. The detection support 100 drives the adjusting surrounding block 130 to rotate. Since the adjusting surrounding block 130 is in threaded cooperation with the inner periphery block 200, the adjusting surrounding block 130 rotates synchronously with the detection support 100 and moves downward, i.e., the adjusting surrounding block 130 moves downward relative to the blocking ring 400, so that the pressing block 120 arranged on the adjusting surrounding block 130 moves downward to extrude the sealing material in the material containing cylinder 420, so that the sealing material falls into the application space 600 in a rotating and falling manner, improving the uniformity of the sealing material falling.

[0037] In a further embodiment, the detection support 100 is provided with a plurality of return holes 113, which are vertically through the detection support 100 and communicate with the application space 600.

[0038] The return holes 113 are arranged to overflow the sealing material in the application space 600 after the application space 600 is filled with the sealing material, so that the operator can observe and determine whether the application space 600 needs to continue feeding.

[0039] In a further embodiment, the ground permeability detection device for road maintenance further comprises a counterweight 700 which can be placed on the upper end of the detection support 100. The outer peripheral wall surface of the adjusting enclosure 130 is sequentially provided with a first smooth section and a first threaded section in the vertical direction, and the first smooth section is located above the first threaded section. The inner peripheral wall surface of the inner enclosure 200 is sequentially provided with a second smooth section and a second threaded section in the vertical direction, and the second smooth section is located below the second threaded section, and the first threaded section and the second threaded section are rotationally matched in the initial state.

[0040] Further, the detection support 100 and the retaining ring 400 are connected through a first elastic member 410 which is arranged in the vertical direction and is a spring. When the detection support 100 moves downward relative to the retaining ring 400, the first elastic member 410 is compressed.

[0041] The adjusting enclosure 130 and the inner enclosure 200 are connected through a second elastic member 210 which is arranged in the vertical direction and is a spring. When the adjusting enclosure 130 moves downward relative to the inner enclosure 200, the second elastic member 210 is compressed.

[0042] After the sealing material overflows from the return hole 113, the counterweight 700 is placed on the detection support 100, and the relationship between the volume of the smearing space 600 and the downward distance of the detection support 100 is adjusted so that the engagement of the first threaded section and the second threaded section ends after the sealing material overflows from the return hole 113. Under the action of the counterweight 700, the adjusting enclosure 130 will move downward relative to the inner enclosure 200, further compressing the first elastic member 410 and the second elastic member 210, so that the sealing material in the smearing space 600 is compacted, and the adhesion between the sealing material and the ground is improved.

[0043] In a further embodiment, the pressing block 120 is installed on the detection support 100 through a third elastic member 121 which is arranged in the vertical direction and is a spring.

[0044] In this embodiment, when the pressure of the sealing material increases after the counterweight 700 is added, the third elastic member 121 is compressed, and the sealing material enters the material container 420 to be recycled in reverse, which can save the use of sealing material and relieve the pressure of the sealing material.

[0045] Further, the detection support 100 is provided with an exhaust valve 160 which is arranged in the vertical direction, and the counterweight 700 is provided with a clearance hole 701 through which the exhaust valve 160 and the support frame 111 can pass, and the exhaust valve 160 communicates with the detection space 500.

[0046] By setting the exhaust valve 160, when the exhaust valve 160 is opened, the gas is allowed to be discharged from the detection space 500, when the exhaust valve 160 is closed, the gas is limited to be discharged from the detection space 500. And when the valve switch 112 of the water tank 110 is opened, the water flows downward to discharge the gas in the detection space 500, the operator can press the detection support 100 downward, so that the adjusting enclosure 130 is downward relative to the inner enclosure 200, which assists the gas to be discharged.

[0047] In other possible another implementation, each lower pressing block 120 is provided with an adjusting cylinder 140, the adjusting cylinder 140 is provided with a partition plate, the partition plate divides the adjusting cylinder 140 into an upper cavity and a lower cavity, the upper cavity is above the lower cavity, and the lower pressing block 120 and the third elastic member 121 are located in the lower cavity of the adjusting cylinder 140. The detection support 100 is uniformly distributed with a plurality of supporting arms 150 around the vertical direction, the supporting arms 150 are one-to-one corresponding to the adjusting cylinders 140, the supporting arms 150 are installed in the upper cavities of the adjusting cylinders 140 through fourth elastic members 141, the fourth elastic members 141 are arranged along the vertical direction, and the fourth elastic members 141 are springs.

[0048] In the embodiment, by setting the adjusting cylinder 140, when the detection is completed, the counterweight 700 is first removed, then the first elastic member 410, the second elastic member 210 and the third elastic member 121 are reset by a distance, then the detection support 100 is reversed, the first threaded section is matched with the second threaded section again, and then the detection support 100 and the adjusting enclosure 130 are moved upward while rotating, at this time, the lower pressing block 120 also moves upward, and a part of the sealing material in the smearing space 600 is drawn back, so that the sealing material is recycled. If the sealing material hardens into a lump and cannot be drawn, there will be no air in the smearing space 600 at this time, the lower pressing block 120 cannot move upward, at this time, the fourth elastic member 141 is compressed, when the operator finds that the fourth elastic member 141 is compressed, the detection support 100 is no longer rotated, and the detection support 100 is directly lifted upward.

[0049] In combination with the above embodiment, the specific working process is as follows:

[0050] In the detection of ground permeability, first, the sealing material is installed in the material holding cavity, then the detection device is placed on the ground at a random detection point, and the detection support 100 is manually rotated. The rotation of the detection support 100 will drive the adjustment fence 130 and the blocking ring 400 to rotate synchronously. Since the inner fence 200 and the outer fence 300 are in abutment with the ground and there is a large friction force between them, the inner fence 200 and the outer fence 300 remain in a relatively static state at this time. The detection support 100 drives the adjustment fence 130 to rotate, and since the adjustment fence 130 is threadedly connected with the inner fence 200, the adjustment fence 130 will rotate synchronously with the detection support 100 and move downward, that is, the adjustment fence 130 will move downward relative to the blocking ring 400, causing the lower pressing block 120 provided on the adjustment fence 130 to move downward and extrude the sealing material in the material holding cylinder 420, so that the sealing material falls into the smearing space 600 in a rotating and falling manner, improving the uniformity of the sealing material falling.

[0051] After the smearing space 600 is filled with sealing material, the sealing material will overflow from the return hole 113, making it convenient for the operator to observe. After the sealing material overflows from the return hole 113, the counterweight 700 is placed on the detection support 100, and the relationship between the volume of the smearing space 600 and the downward distance of the detection support 100 is adjusted, so that when the sealing material overflows from the return hole 113, the engagement of the first threaded section and the second threaded section ends. Under the action of the counterweight 700, the adjustment fence 130 moves downward relative to the inner fence 200, further compressing the first elastic member 410 and the second elastic member 210, so that the sealing material in the smearing space 600 is compacted, improving the adhesion between the sealing material and the ground. When the pressure of the sealing material increases after the counterweight 700 is installed, the lower pressing block 120 will compress the third elastic member 121, so that the sealing material enters the material holding cylinder 420 and is recycled in the opposite direction, saving the use of sealing material and relieving the pressure of the sealing material.

[0052] Then the valve switch 112 of the water holding cylinder 110 is opened, and the water in the water holding cylinder 110 is injected into the detection space 500. During the process of opening the valve switch 112 of the water holding cylinder 110 to make the water flow downward to discharge the gas in the detection space 500, the operator can press the detection support 100 downward to make the adjustment fence 130 move downward relative to the inner fence 200 to assist in discharging the gas. After the gas is discharged, water continues to be injected, and the permeability is evaluated by measuring the penetration depth or amount of water in the ground within a certain period of time.

[0053] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A ground permeability testing device for highway maintenance, characterized in that: The system includes a testing support, an inner enclosure, an outer enclosure, and a retaining ring. The inner enclosure is vertically positioned below the testing support, defining a testing space between the inner enclosure, the testing support, and the ground. A water-holding cylinder is mounted on the testing support and communicates with the testing space. The retaining ring is positioned below the testing support and outside the inner enclosure, allowing the testing support and the retaining ring to move relative to each other vertically. The outer enclosure is rotatably mounted on the lower end of the retaining ring, coaxial with the inner enclosure, and its lower surface is on the same horizontal plane as the lower surface of the inner enclosure. A coating space is defined between the testing support, the inner enclosure, the outer enclosure, and the retaining ring. A material-holding cavity is provided on the retaining ring and communicates with the coating space. The detection support has multiple pressing blocks arranged vertically, positioned above the material-holding cavity. These pressing blocks can move downwards into the material-holding cavity and slide to seal it. A retaining ring has multiple material-holding cylinders evenly distributed vertically. The material-holding cavity is defined by the internal space of these cylinders. Each cylinder corresponds to a pressing block, with each pressing block positioned above its corresponding cylinder. The pressing blocks can move downwards into the cylinder and slide to seal it. The detection support is rotatable vertically, and the retaining ring rotates synchronously with it. The retaining ring can rotate vertically relative to the outer retaining ring and move synchronously with it. The detection support is connected to an inner retaining ring via an adjusting enclosure, which is threaded into the inner retaining ring. A counterweight is also included, which can be placed on the upper end of the detection support. The outer perimeter of the adjusting enclosure has a first smooth section and a first threaded section arranged vertically in sequence. The inner enclosure has a first smooth section located above the first threaded section. A second smooth section and a second threaded section are sequentially arranged vertically on the inner circumferential wall of the inner enclosure. The second smooth section is located below the second threaded section. Initially, the first and second threaded sections are rotatably engaged. The detection support and the retaining ring are connected by a first elastic element, and the adjusting enclosure and the inner enclosure are connected by a second elastic element. Both the first and second elastic elements are arranged vertically. The lower pressure block is installed on the detection support via a third elastic element, which is also arranged vertically. Each lower pressure block has an adjusting cylinder with a partition inside. The partition divides the adjusting cylinder into an upper chamber and a lower chamber, with the upper chamber located above the lower chamber. The lower pressure block and the third elastic element are both located in the lower chamber of the adjusting cylinder. When the pressure of the sealing material increases after the addition of a counterweight, the lower pressure block compresses the third elastic element, causing the sealing material to enter the receiving cylinder and be recycled in the reverse direction.

2. The ground permeability testing device for highway maintenance according to claim 1, characterized in that: Both the inner and outer perimeter barriers have pads at their lower ends. These pads are made of rubber and are elastic.

3. The ground permeability testing device for highway maintenance according to claim 1, characterized in that: The testing support has multiple return holes, which are connected vertically to the coating space.

4. The ground permeability testing device for highway maintenance according to claim 1, characterized in that: The testing support has multiple support arms evenly distributed in the vertical direction. Each support arm corresponds to an adjusting cylinder. The support arms are installed in the upper cavity of the adjusting cylinder through a fourth elastic element, which is set in the vertical direction.

5. The ground permeability testing device for highway maintenance according to claim 1, characterized in that: An exhaust valve is installed on the testing support, and the exhaust valve is connected to the testing space.

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