Pavement compactness detection device for highway engineering

Abstract

The invention relates to the technical field of pavement compactness detection, in particular to a pavement compactness detection device for highway engineering. Comprising a rack which is in sliding connection with a sliding block; the circular ring is arranged on the sliding block, and the circular ring is detachably connected with a sand filling cylinder; the base plate is arranged on one side of the rack, the base plate is fixedly connected with a fixing ring, the fixing ring is slidably connected with a plurality of sliding frames, the sliding frames are fixedly connected with first magnets, the first magnets are detachably connected with second magnets, and plastic films are detachably connected between all the first magnets and all the second magnets. A plastic film is fixed through a first magnet and a second magnet, fine sand in a sand filling cylinder falls into the plastic film, the plastic film is expanded from bottom to top under extrusion of the fine sand and is attached to the side wall of a test pit, and the problem that the fine sand makes contact with wet soil on the side wall of the test pit, so that the capillary bridge effect is caused is solved.

Description

Technical Field

[0001] The invention relates to the technical field of road surface compaction detection, and in particular to a road surface compaction detection device for highway engineering. Background Art

[0002] Highway engineering refers to a series of projects such as highway planning, design, construction, and maintenance, focusing on building and maintaining a road network connecting different locations. Among them, roadbed engineering is an essential part of the highway construction stage. The completion of roadbed engineering directly affects the bearing capacity, stability and durability of the road. Therefore, after the completion of the roadbed engineering, it is necessary to test the compaction of the road surface to determine whether the engineering quality of the roadbed meets the standards. The main testing method for the compaction of the roadbed and pavement is the sand filling method, that is, a test pit of a specified size is dug into the road surface through a sand filling device and filled with fine sand. The dry density and wet density are calculated according to the amount of soil samples dug out of the test pit, the amount of fine sand filled, etc., and the compaction is finally calculated. However, in the operation process of the existing sand filling device, since the sand filling device fills the fine sand into the newly dug test pit, the soil in the test pit will be in a wet state, causing some of the fine sand filled in the test pit to absorb water and form a capillary bridge effect to aggregate into a cluster, which reduces the gap between some of the fine sand in the test pit, increases the amount of fine sand filled in the test pit, and thus causes errors in the compaction calculation. Summary of the invention

[0003] In order to overcome the problem that the amount of fine sand filled in a test pit increases due to soil moisture in the test pit, the present invention provides a road surface compaction detection device for highway engineering.

[0004] The technical solution is: a road surface compaction detection device for highway engineering, comprising:

[0005] A frame, wherein the frame is slidably connected to a sliding block, and a weight measuring instrument and a first elastic member are fixedly connected between the frame and the sliding block;

[0006] A circular ring is arranged on the sliding block, the circular ring is detachably connected with a sand filling cylinder, and the sand filling cylinder is provided with a valve and a rotating rod for controlling the opening and closing of the valve;

[0007] A base plate is arranged on one side of the frame, the base plate is provided with a through hole, the base plate is fixedly connected with a fixing ring, the fixing ring is slidably connected with a plurality of sliding frames, the sliding frames are fixedly connected with a first magnet, the first magnet is detachably connected with a second magnet, a plastic film is detachably connected between all the first magnets and all the second magnets, and the sliding frames are fixedly connected with an extrusion column;

[0008] A rotating ring is rotatably connected to the base plate, the rotating ring is provided with inclined slots having the same number as the sliding frame, the extrusion columns are located in adjacent inclined slots on the rotating ring, and the rotating ring is fixedly connected with a handle.

[0009] Furthermore, it also includes:

[0010] A material feed assembly is arranged on the ring and is used to change the filling mode of fine sand. The material feed assembly comprises:

[0011] A hydraulic push rod is fixedly connected to the sliding block, and a telescopic portion of the hydraulic push rod is fixedly connected to the ring;

[0012] The material guide shell is fixedly connected to the circular ring, and the material guide shell is communicated with the sand filling cylinder.

[0013] Furthermore, it also includes:

[0014] The extrusion assembly is arranged on the frame and is used to automatically squeeze the rotating rod of the sand filling cylinder to make it swing as the material guide shell moves up and down. The extrusion assembly includes:

[0015] The first trapezoidal plate is fixedly connected to the frame, and the frame is fixedly connected to the second trapezoidal plate. The first trapezoidal plate and the second trapezoidal plate are both used for squeezing the rotating rod of the sand filling cylinder.

[0016] Furthermore, the material guide shell is provided with an air inlet cavity, a plurality of ventilation cavities and air outlet holes which are the same in number as the plurality of ventilation cavities; the air inlet cavity of the material guide shell is connected with the plurality of ventilation cavities; the air outlet holes of the material guide shell are connected with the ventilation cavities of adjacent material guide shells; and the air inlet cavity of the material guide shell is externally connected with a hot air supply device.

[0017] Furthermore, the air outlet of the material guiding shell is inclined downward from a direction close to the axis of the circular ring to a direction away from the axis of the circular ring.

[0018] Furthermore, the substrate is detachably connected to an insert plate for sealing the through hole of the substrate.

[0019] Furthermore, it also includes:

[0020] An adjusting component is arranged on the material guide shell and is used to change the opening size of the plastic film according to the volume of fine sand filled in the test pit. The adjusting component includes:

[0021] A telescopic rod is fixedly connected to the material guide shell, a connecting frame is fixedly connected to the telescopic end of the telescopic rod, a rotating block is rotatably connected to the connecting frame, and the rotating block is used to squeeze the handle, a resistance is provided between the base plate and the rotating ring, and a resistance is provided between the telescopic part and the fixed part of the telescopic rod;

[0022] A limit block is fixedly connected to the connecting frame, and the limit block is used to limit the rotating block, and the rotating ring is located on the moving path of the limit block.

[0023] Furthermore, it also includes:

[0024] The L-shaped plate is slidably connected to the frame, and the base plate is provided with a rectangular slide groove, and the rectangular slide groove of the base plate is used to limit the L-shaped plate.

[0025] Furthermore, it also includes:

[0026] A second elastic member is fixedly connected between the L-shaped plate and the frame;

[0027] There are several rollers, all of which are rotatably connected to the L-shaped plate and are used to reduce the thrust on the base plate.

[0028] Furthermore, a plurality of rectangular notches are provided on the lower side of the substrate to reduce the influence of small stones on the road surface on the horizontality of the substrate.

[0029] Compared with the prior art, the present invention has the following advantages: 1. The present invention fixes the plastic film by the first magnet and the second magnet, so that the fine sand in the sand filling tube falls into the plastic film. Under the squeeze of the fine sand, the plastic film gradually opens from bottom to top and fits with the side wall of the test pit, avoiding the contact between the fine sand and the moist soil on the side wall of the test pit, which would cause the problem of capillary bridge effect.

[0030] 2. The present invention reduces the falling distance of the fine sand into the plastic film by allowing the fine sand to flow out from the discharge port of the material guide shell, thereby preventing the fine sand from being mixed with excessive air during the falling process, helping to improve the compactness of the fine sand in the cylindrical plastic film, making the weight of the fine sand filled in the test pit more accurate, and improving the accuracy of compaction calculation.

[0031] 3. The present invention enables the air outlet of the material guide shell to blow air obliquely downward on all sides, and the blown hot air flow is combined into a cone shape. The blown hot air flow heats the cylindrical plastic film to enhance its deformation ability, so that the cylindrical plastic film and the protrusions on the side wall of the test pit fit more closely, ensuring that the test pit is filled with fine sand to improve the accuracy of compaction calculation. At the same time, the blown hot air flow will also drive the fine sand on the upper surface of the cylindrical plastic film to move around, thereby accelerating the filling speed of the fine sand in the cylindrical plastic film.

[0032] 4. The present invention ensures that the axis of the material guide shell coincides with the axis of the through hole on the substrate by docking the L-shaped plate with the adjacent rectangular slide grooves on the substrate, thereby ensuring that the discharge port of the material guide shell is always located in the middle of the through hole on the substrate, so that the fine sand flowing out of the discharge port of the material guide shell accumulates into a cone shape, exerting a more uniform thrust on the cylindrical plastic film in all directions, so as to ensure that the cylindrical plastic film fits tightly against the side wall of the test pit, thereby improving the accuracy of the high compaction degree calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the three-dimensional structure of the first trapezoidal plate and the second trapezoidal plate of the present invention;

[0035] Figure 3 It is a schematic diagram of the three-dimensional structure of the rotating ring and the handle of the present invention;

[0036] Figure 4 It is an exploded view of the fixed ring and the rotating ring of the present invention;

[0037] Figure 5 An exploded view of the extrusion column and the rotating ring of the present invention;

[0038] Figure 6 An exploded view of the first magnet and the second magnet of the present invention;

[0039] Figure 7 An exploded view of the base plate and the plug board of the present invention;

[0040] Figure 8 It is a schematic diagram of the three-dimensional structure of the ring and the guide shell of the present invention;

[0041] Fig. 9 It is a three-dimensional structural schematic diagram of the circular ring and the sand filling cylinder of the present invention;

[0042] Fig.10 It is a three-dimensional structural cross-sectional view of the sand filling cylinder of the present invention;

[0043] Fig.11 It is a schematic diagram of the three-dimensional structure of the connecting frame and the rotating block of the present invention;

[0044] Fig.12 It is a schematic diagram of the three-dimensional structure of the L-shaped plate and the second elastic member of the present invention.

[0045] Figure numbers: 1, frame, 2, sliding block, 3, weight measuring instrument, 4, first elastic member, 5, ring, 6, sand filling cylinder, 7, base plate, 8, fixed ring, 9, sliding frame, 10, first magnet, 11, second magnet, 12, extrusion column, 13, rotating ring, 14, handle, 15, hydraulic push rod, 16, material guide shell, 17, plug plate, 18, first trapezoidal plate, 19, second trapezoidal plate, 20, telescopic rod, 21, connecting frame, 22, rotating block, 23, limit block, 24, L-shaped plate, 25, second elastic member, 26, roller. DETAILED DESCRIPTION

[0046] The preferred technical solutions of the present invention are described in detail below with reference to the accompanying drawings.

[0047] When the existing sand filling device is used to test the compaction of soil, fine sand is filled into the newly excavated test pit, which may cause the soil in the test pit to be moist, thereby causing the fine sand to absorb moisture and aggregate into clumps due to the capillary bridge effect, thus reducing the gaps between some fine sands in the test pit and causing errors in the compaction calculation.

[0048] Embodiment 1: A road surface compaction detection device for highway engineering, such as Figure 1-Figure 6 As shown, it includes: a frame 1, the frame 1 is slidably connected with a sliding block 2, a weight measuring instrument 3 and a first elastic member 4 are fixedly connected between the frame 1 and the sliding block 2; a circular ring 5 is arranged on the sliding block 2, the circular ring 5 is detachably connected with a sand filling cylinder 6, the sand filling cylinder 6 is provided with a valve and a rotating rod for controlling the opening and closing of the valve; a base plate 7 is arranged on one side of the frame 1, the base plate 7 is provided with a through hole, the base plate 7 is fixedly connected with a fixed ring 8, the fixed ring 8 is slidably connected with a plurality of sliding frames 9, the sliding frame 9 is fixedly connected with a first magnet 10, the first magnet 10 is detachably connected with a second magnet 11, all the first magnets 10 and all the second magnets 11 are detachably connected with a plastic film, and the sliding frame 9 is fixedly connected with an extrusion column 12; a rotating ring 13 is rotatably connected to the base plate 7, the rotating ring 13 is provided with an inclined slide groove having the same number as the sliding frame 9, the extrusion column 12 is located in the adjacent inclined slide grooves on the rotating ring 13, and the rotating ring 13 is fixed with a handle 14.

[0049] In the above scheme, a numerical control table is arranged on the frame 1, and the numerical control table on the frame 1 is electrically connected to the weight measuring instrument 3. The frame 1 is externally connected with a mobile power supply for powering the numerical control table on the frame 1. The weight measuring instrument 3 is an existing device for measuring the weight of an object, and its specific structure is not shown in the figure. The first elastic member 4 is a tension spring. In this embodiment, the sliding block 2 is fixedly connected to the circular ring 5. The sand filling cylinder 6 is an existing device. The diameter of the opening below the sand filling cylinder 6 is smaller than the diameter of the through hole on the substrate 7, which is used to reduce the amount of fine sand in the sand filling cylinder 6 falling onto the substrate 7. The axis of the through hole of the substrate 7, the axis of the fixed ring 8 and the axis of the rotating ring 13 all coincide. The sliding frame 9 is composed of a slider and a sliding rod. The number of the sliding frames 9 is four, and the four sliding frames 9 are evenly distributed circumferentially. The first magnet 10 and the second magnet 11 are cylindrical in shape, and the first magnet 10 and the second magnet 11 are The diameter is less than or equal to the diameter of the sliding rod on the sliding frame 9, which is used to ensure that the first magnet 10 and the second magnet 11 can be received in the fixing ring 8. The plastic film to which the first magnet 10 and the second magnet 11 are detachably connected is cylindrical in shape (hereinafter referred to as cylindrical plastic film, and its specific shape is not shown in the figure). In this embodiment, the diameter of the cylindrical plastic film when it is fully expanded is equal to the diameter of the through hole on the substrate 7, and the height of the cylindrical plastic film is higher than the specified test pit height for excavation, which is used to compensate for the surface area of ​​the cylindrical plastic film that needs to be increased due to the protrusions on the side walls of the test pit. The cylindrical plastic film is initially in a contracted state, and is used to fill the cylindrical plastic film with fine sand so that the cylindrical plastic film is expanded from bottom to top in sequence, which is beneficial to the discharge of gas between the cylindrical plastic film and the side walls of the test pit. The cylindrical plastic film can be marked at the four points at its opening to facilitate subsequent fixation.

[0050] When using the device for compaction detection, the staff first uses the through hole of the substrate 7 as a reference, digs a cylindrical pit with the same diameter as the through hole on the substrate 7 from the road base surface, collects and weighs the excavated soil samples, and records the weight of the excavated soil samples. Then, the four quarter points of the cylindrical plastic film are fixed between the adjacent first magnet 10 and the adjacent second magnet 11, and the first magnet 10 and the adjacent second magnet 11 are tightly attached to each other by the magnetic force between the two and clamp the four quarter points of the cylindrical plastic.

[0051] After the cylindrical plastic is fixed, the substrate 7 is placed. The staff first ensures that the edge of the through hole on the substrate 7 coincides with the edge of the test pit, and then rotates the handle 14 clockwise (with the edge of the test pit) to Figure 3(Taking the top view as an example), rotate the rotating ring 13 to move the four sliding frames 9 toward the periphery, driving the opening of the cylindrical plastic film to open. At this time, the cylindrical plastic film is in an inverted cone shape as a whole and has a large number of wrinkles to ensure that after the shrinking cylindrical plastic film is fully opened, the cylindrical plastic film fits the irregular protrusions on the side wall of the test pit to compensate for the required increased surface area without causing the opening of the cylindrical plastic film to be subjected to a downward pulling force. Finally, the staff moves the frame 1 to make the axis of the sand filling cylinder 6 coincide with the axis of the through hole on the substrate 7, and starts the external mobile power supply to power the CNC table and weight measuring instrument 3 on the frame 1.

[0052] After completing the above actions, the staff pours the fine sand needed to fill the test pit into the sand filling cylinder 6, and turns the rotating rod of the sand filling cylinder 6 to open the valve of the sand filling cylinder 6. The fine sand in the sand filling cylinder 6 flows through the valve and falls into the cylindrical plastic film. Under the squeeze of the fine sand, the cylindrical plastic film gradually opens from bottom to top and fits with the side wall of the test pit to prevent the fine sand from contacting the moist soil on the side wall of the test pit, which would cause the capillary bridge effect.

[0053] When the test pit is filled with fine sand, the staff turns the rotating rod of the sand filling cylinder 6 to close the valve of the sand filling cylinder 6, and then records the weight of the remaining fine sand in the sand filling cylinder 6 through the weight measuring instrument 3. Finally, the excess fine sand on the substrate 7 is collected and weighed, and the weight of the excess fine sand on the substrate 7 is recorded.

[0054] After completing the compaction calculation of a test pit, the staff first rotates the handle 14 counterclockwise (with the Figure 3 Taking the top view angle as an example), rotate the rotating ring 13 to reset the first magnet 10, and then separate the four first magnets 10 from the adjacent second magnets 11, and recover the cylindrical plastic film and the fine sand in the cylindrical plastic film.

[0055] Embodiment 2: Based on embodiment 1, Figure 2 and Figure 8-Figure 12 As shown, it also includes: a material discharge component, which is arranged on the ring 5 and is used to change the filling method of fine sand. The material discharge component includes: a hydraulic push rod 15, which is fixed to the sliding block 2, and the telescopic part of the hydraulic push rod 15 is fixed to the ring 5; a material guide shell 16, which is fixed to the ring 5, and the material guide shell 16 is connected to the sand filling cylinder 6.

[0056] In the above scheme, there are two hydraulic push rods 15 for applying a stable force to the ring 5. Both hydraulic push rods 15 are electrically connected to the CNC table on the frame 1. A discharge port is provided on the lower side of the material guide shell 16. The diameter of the discharge port of the material guide shell 16 is smaller than the diameter of the through hole on the substrate 7. The lower end face of the material guide shell 16 is an annular arc surface, and the annular arc surface at the lower end of the material guide shell 16 is made of a smooth material, such as silica gel, for reducing the damage of the lower end of the material guide shell 16 to the cylindrical plastic bag. The air inlet of the material guide shell 16 is located in the middle thereof, and a hot air supply device externally connected to the air inlet of the material guide shell 16 is electrically connected to the CNC table on the frame 1.

[0057] After repeating the action of placing the substrate 7 in Example 1, the frame 1 is moved to make the axis of the guide shell 16 coincide with the axis of the through hole on the substrate 7, and then the external mobile power supply is started, and the telescopic ends of the two hydraulic push rods 15 are controlled to move downward through the numerical control table on the frame 1. The telescopic ends of the two hydraulic push rods 15 jointly drive the ring 5 to move downward, and the ring 5 drives the guide shell 16 and the sand filling cylinder 6 to move downward. The lower side of the guide shell 16 gradually approaches the cylindrical plastic film, and then the lower end of the guide shell 16 enters into the cylindrical plastic film, and drives the lower end of the cylindrical plastic film close to the bottom of the test pit. At this time, the staff stops the telescopic movement of the two hydraulic push rods 15 through the numerical control table on the frame 1. The staff then moves the rotating rod of the sand filling cylinder 6, opens the valve of the sand filling cylinder 6, and allows the fine sand to flow downward through the valve into the material guide shell 16, and flows out from the discharge port of the material guide shell 16. Since the lower end of the material guide shell 16 is close to the bottom of the test pit, after the fine sand falls into the cylindrical plastic film, the cylindrical plastic film is first squeezed to make it fit with the bottom of the test pit, and since the falling distance of the fine sand is small, it will not be mixed with too much air, which helps to improve the compactness of the fine sand in the cylindrical plastic film, reduce the occurrence of stratification of particles of different particle sizes caused by the free fall of fine sand, make the weight of the fine sand filled in the test pit more accurate, and improve the accuracy of compaction calculation.

[0058] When the staff turns the rotating rod of the sand filling cylinder 6 and opens the valve of the sand filling cylinder 6, the numerical control table on the frame 1 controls the telescopic ends of the two hydraulic push rods 15 to move upward, and the telescopic ends of the two hydraulic push rods 15 move upward and drive the ring 5 to move upward. The ring 5 drives the sand filling cylinder 6 and the guide shell 16 to move upward. While the lower end of the guide shell 16 moves upward, the fine sand is continuously guided to flow out from the discharge port of the guide shell 16, so that the fine sand continuously fills the cylindrical plastic film to make it open, and it is always ensured that the newly flowing fine sand is in contact with the fine sand diameter already existing in the cylindrical plastic film, so that there is not too much air mixed between the fine sand, and the compactness between the fine sand is improved.

[0059] As the telescopic ends of the two hydraulic push rods 15 continue to move upward, the lower end of the guide shell 16 gradually approaches the opening of the cylindrical plastic film. After the lower end of the guide shell 16 moves upward and passes through the opening of the cylindrical plastic film, the telescopic ends of the two hydraulic push rods 15 continue to move upward for a distance and reset to ensure that the cylindrical plastic film is fully opened.

[0060] When the test pit is filled with fine sand, the staff moves the rotating rod of the sand filling cylinder 6, closes the valve of the sand filling cylinder 6, repeats the actions in Example 1, and records the weight of the remaining fine sand in the sand filling cylinder 6 and the weight of the excess fine sand on the substrate 7.

[0061] Embodiment 3: Based on embodiment 2, Figure 2 As shown, it also includes: an extrusion assembly, which is arranged on the frame 1 and is used to automatically squeeze the rotating rod of the sand filling cylinder 6 to make it swing as the guide shell 16 moves up and down. The extrusion assembly includes: a first trapezoidal plate 18, which is fixed to the frame 1, and the frame 1 is fixed with a second trapezoidal plate 19. The first trapezoidal plate 18 and the second trapezoidal plate 19 are both used to squeeze the rotating rod of the sand filling cylinder 6.

[0062] In the above scheme, the beveled edges of the first trapezoidal plate 18 and the second trapezoidal plate 19 are both rounded to reduce the contact area between the beveled edges of the first trapezoidal plate 18 and the second trapezoidal plate 19 and the rotating rod on the material guide shell 16, thereby reducing the wear on the rotating rod on the material guide shell 16. The beveled surfaces of the first trapezoidal plate 18 and the second trapezoidal plate 19 are both used to squeeze the rotating rod of the sand filling cylinder 6.

[0063] When the axis of the material guide shell 16 coincides with the axis of the through hole on the base plate 7, the action of the telescopic end of the hydraulic push rod 15 moving downward in Example 2 is repeated, and the telescopic end of the hydraulic push rod 15 drives the circular ring 5 to move downward, and the circular ring 5 drives the sand filling cylinder 6 and the material guide shell 16 to move downward, and the sand filling cylinder 6 drives the rotating rod thereon to move downward, and the rotating rod of the sand filling cylinder 6 moves downward and gradually approaches the second trapezoidal plate 19, and then the rotating rod of the sand filling cylinder 6 contacts the second trapezoidal plate 19, and the rotating rod of the sand filling cylinder 6 swings to the right under the squeezing of the second trapezoidal plate 19, so that the valve of the sand filling cylinder 6 is opened, and at this time the lower end of the material guide shell 16 is located in the cylindrical plastic film, so that the valve on the sand filling cylinder 6 is automatically opened, thereby improving work efficiency.

[0064] After the valve of the sand filling cylinder 6 is opened, the action of the telescopic ends of the two hydraulic push rods 15 moving upward in Example 2 is repeated, and the telescopic ends of the two hydraulic push rods 15 jointly drive the ring 5 to move upward, and the ring 5 drives the sand filling cylinder 6 and the guide shell 16 to move upward, and the sand filling cylinder 6 drives the rotating rod thereon to move upward, and the rotating rod of the sand filling cylinder 6 moves upward and gradually approaches the first trapezoidal plate 18, and then the rotating rod of the sand filling cylinder 6 contacts the first trapezoidal plate 18, and the rotating rod of the sand filling cylinder 6 swings to the left and resets under the squeezing of the first trapezoidal plate 18, so that the valve of the sand filling cylinder 6 is closed.

[0065] like Figure 7 and Figure 9-11 As shown, the material guide shell 16 is provided with an air inlet cavity, a plurality of ventilation cavities and air outlet holes which are the same in number as the plurality of ventilation cavities. The air inlet cavity of the material guide shell 16 is connected with the plurality of ventilation cavities. The air outlet holes of the material guide shell 16 are connected with the air outlet holes of adjacent material guide shells 16. The air inlet cavity of the material guide shell 16 is externally connected with a hot air supply device. The air outlet holes of the material guide shell 16 are inclined downward from the direction close to the axis of the ring 5 to the direction away from the axis of the ring 5. The base plate 7 is detachably connected with an insert plate 17 for sealing the through holes of the base plate 7.

[0066] When the ring 5 drives the guide shell 16 and the sand filling cylinder 6 to move downward, the action of the rotating rod of the sand filling cylinder 6 swinging to the right under the pressure of the second trapezoidal plate 19 in Example 3 is repeated. After the valve of the sand filling cylinder 6 is opened, the staff starts the hot air supply device connected to the air inlet cavity of the guide shell 16 through the numerical control table on the frame 1. The hot air supply device starts to transport hot air to the air inlet cavity of the guide shell 16. The hot air enters from the air inlet cavity of the guide shell 16, flows through the several ventilation cavities in the guide shell 16, and finally blows out from the several air outlets of the guide shell 16 to form a hot air flow, and passes through The air outlet holes of the guide shell 16 are guided to blow air obliquely downward on all sides, and the blown hot air flows are combined into a cone shape, which is similar to the cone shape presented when fine sand is accumulated in the cylindrical plastic film. The blown hot air flow heats the cylindrical plastic film, enhances the deformation ability of the cylindrical plastic film, and makes the cylindrical plastic film fit more closely with the protrusions on the side wall of the test pit. At the same time, the blown hot air flow will also drive the fine sand on the upper surface of the cylindrical plastic film to move around, thereby accelerating the filling speed of the fine sand in the cylindrical plastic film.

[0067] When the ring 5 drives the material guide shell 16 and the sand filling cylinder 6 to move upward, the action of the rotating rod of the sand filling cylinder 6 swinging to the left and resetting under the squeezing of the first trapezoidal plate 18 in Example 3 is repeated. After the valve of the sand filling cylinder 6 is closed, the staff closes the hot air supply device connected to the air inlet chamber of the material guide shell 16 through the CNC table on the frame 1. When the test pit is filled with fine sand, the action of collecting the excess fine sand on the substrate 7 at the end of the example is repeated. At this time, the through hole on the substrate 7 can be blocked by the plug plate 17, and then the excess fine sand on the substrate 7 can be collected by dumping, and the weight of the excess fine sand on the substrate 7 is recorded to reduce the amount of fine sand falling from the through hole on the substrate 7 when the excess fine sand on the substrate 7 is collected.

[0068] Embodiment 4: Based on embodiment 3, Figure 2 and Fig.11As shown, it also includes: an adjusting component, which is arranged on the material guide shell 16 and is used to change the opening size of the plastic film according to the volume of fine sand filled in the test pit. The adjusting component includes: a telescopic rod 20, which is fixed to the material guide shell 16, and the telescopic end of the telescopic rod 20 is fixed to a connecting frame 21, and the connecting frame 21 is rotatably connected to a rotating block 22, and the rotating block 22 is used to squeeze the handle 14, and there is resistance between the base plate 7 and the rotating ring 13, and there is resistance between the telescopic part and the fixed part of the telescopic rod 20; a limit block 23, which is fixed to the connecting frame 21, and the limit block 23 is used to limit the rotating block 22, and the rotating ring 13 is located on the moving path of the limit block 23.

[0069] In the above scheme, the resistance between the telescopic part and the fixed part of the telescopic rod 20 is smaller than the resistance between the rotating ring 13 and the base plate 7, which is used to prevent the telescopic part of the telescopic rod 20 from sliding down during the movement of the frame 1, thereby affecting the placement of the subsequent base plate 7. The cross-sectional shape of the connecting frame 21 is n-shaped, so that the connecting frame 21 does not affect the rotation of the rotating block 22. The rotating block 22 is provided with an inclined surface, and the limit block 23 is located on the lower side of the connecting frame 21.

[0070] After the substrate 7 is placed, no longer rotate clockwise (with the substrate 7 attached). Figure 3 The handle 14 is rotated, and the frame 1 is moved to repeat the action of moving the frame 1 in Example 2 so that the axis of the guide shell 16 coincides with the axis of the through hole on the substrate 7. The staff first pulls the telescopic end of the telescopic rod 20 downward to move downward, and the telescopic end of the telescopic rod 20 drives the connecting frame 21 to move downward, and the connecting frame 21 drives the rotating block 22 and the limit block 23 to move downward, and the rotating block 22 moves downward and gradually approaches the upper side of the handle 14, and then the rotating block 22 contacts the upper side of the handle 14 and moves on the handle 14. Under the squeezing, the rotating block 22 begins to swing backward. As the connecting frame 21 continues to move downward, the swing amplitude of the rotating block 22 becomes larger and larger, but the swing angle will never exceed ninety degrees. Finally, the rotating block 22 moves downward and no longer contacts the handle 14. The rotating block 22 swings forward and resets under the action of its own gravity. At the same time, the rear side surface of the rotating block 22 fits with the front side surface of the limit block 23. When the lower side surface of the limit block 23 contacts the upper side surface of the rotating ring 13, the telescopic part of the telescopic rod 20 stops pulling downward.

[0071] After completing the above actions, the action of the ring 5 driving the material guide shell 16 and the sand filling cylinder 6 to move downward in Example 2 is repeated, and the material guide shell 16 drives the fixed part of the telescopic rod 20 to move downward, and the telescopic end of the telescopic rod 20 remains stationary under the support of the rotating ring 13 on the limit block 23.

[0072] After the valve of the sand filling cylinder 6 is opened, the action of the ring 5 driving the material guide shell 16 and the sand filling cylinder 6 to move upward is repeated in Example 2. The material guide shell 16 moves upward to drive the fixed part of the telescopic rod 20 to move upward. The telescopic end of the telescopic rod 20 drives the rotating block 22 to move upward through the connecting frame 21. When the rotating block 22 moves upward and contacts the handle 14, the rotating block 22 remains stationary under the limit of the handle 14 due to the rotation resistance of the rotating ring 13. The rotating block 22 drives the telescopic part of the telescopic rod 20 to remain stationary through the connecting frame 21. When the material guide shell 16 moves upward, the rotating block 22 moves upward to drive the telescopic part of the telescopic rod 20 to move upward. When the lower side of the guide shell 16 gradually approaches the first magnet 10, the distance that the telescopic portion of the telescopic rod 20 slides along the fixed portion of the telescopic rod 20 reaches a maximum value, and then the fixed portion of the telescopic rod 20 continues to drive the telescopic end of the telescopic rod 20 to move upward, and the telescopic end of the telescopic rod 20 moves upward and drives the rotating block 22 and the limit block 23 to move upward through the connecting frame 21, and the rotating block 22 moves upward to squeeze the handle 14 and the rotating block 22 does not rotate under the limit of the limit block 23, so that the handle 14 gradually rotates clockwise (with the handle 14 being attached) under the squeeze of the rotating block 22. Figure 3 Taking the top view as an example), the handle 14 drives the rotating ring 13 to rotate gradually clockwise, so that the four sliding frames 9 gradually move toward the periphery, driving the opening of the cylindrical plastic film to gradually open, and the rotating block 22 squeezes the handle 14 to gradually open the opening of the cylindrical plastic film, so that the cylindrical plastic film will not be in an inverted truncated cone shape when the first magnet 10 and the second magnet 11 are initially fixed, ensuring that when the cylindrical plastic film is filled with fine sand, the cylindrical plastic film always moves in the horizontal direction except for the bottom, so that the cylindrical plastic film actively fits the side wall of the test pit after heating, thereby increasing the degree of fit between the cylindrical plastic film and the side wall of the test pit.

[0073] When the rotation angle of the handle 14 reaches the maximum value, the rotating block 22 is no longer in contact with the handle 14 , and the material guide shell 16 continues to drive the telescopic portion of the telescopic rod 20 to move upward through the fixed portion of the telescopic rod 20 .

[0074] After the compaction calculation of a test pit is completed, the staff pulls the telescopic part of the telescopic rod 20 upward to reset, and rotates the handle 14 counterclockwise (with the attached Figure 3 Taking the top view angle as an example), rotate the rotating ring 13 to reset the first magnet 10.

[0075] Embodiment 5: Based on embodiment 4, Figure 1 , Figure 2 and Fig.12As shown, it also includes: an L-shaped plate 24, which is slidably connected to the frame 1, a base plate 7 is provided with a rectangular slide groove, the rectangular slide groove of the base plate 7 is used to limit the L-shaped plate 24, and a second elastic member 25 is fixed between the L-shaped plate 24 and the frame 1; a plurality of rollers 26, which are rotatably connected to the L-shaped plate 24 and are used to reduce the thrust on the base plate 7, and a plurality of rectangular notches are provided on the lower side of the base plate 7 to reduce the influence of pebbles on the road surface on the levelness of the base plate 7.

[0076] In the above scheme, the number of L-shaped plates 24 is two, and the L-shaped plates 24 can be pre-aligned before being inserted into the rectangular slide groove of the base plate 7. The number of rectangular slide grooves opened on the base plate 7 is two, and the front part of the lower side of the rectangular slide groove of the base plate 7 is inclined to facilitate the insertion of the L-shaped plate 24. The second elastic member 25 is a spring, and the L-shaped plate 24 is rotatably connected with three rollers 26, which are used to reduce the friction between the L-shaped plate 24 and the rectangular slide groove of the base plate 7 when the L-shaped plate 24 is inserted into the rectangular slide groove of the base plate 7. A number of rectangular notches are opened at the bottom of the base plate 7 to reduce the occurrence of the base plate 7 being unable to be close to the ground and warping due to the influence of small soil blocks when the base plate 7 is placed on the ground.

[0077] After the substrate 7 is placed, the frame 1 is moved to the top of the substrate 7, and the staff first aligns the L-shaped plate 24 with the adjacent rectangular slots on the substrate 7, and then pushes the frame 1 to insert the L-shaped plate 24 into the adjacent rectangular slots on the substrate 7. The lower side surfaces of the adjacent rectangular slots on the substrate 7 squeeze the three rollers 26 in sequence. Subsequently, the three rollers 26 drive the L-shaped plate 24 to move upward under the squeezing of the lower side surfaces of the adjacent rectangular slots on the substrate 7, and the adjacent second elastic members 25 are compressed. Finally, the side walls of the rectangular slots on the substrate 7 contact the rear side surfaces of the adjacent L-shaped plates 24, completing the docking of the L-shaped plate 24 with the adjacent rectangular slots on the substrate 7. Through the docking of the L-shaped plate 24 with the adjacent rectangular slots on the substrate 7, it is ensured that the axis of the guide shell 16 coincides with the axis of the through hole on the substrate 7, thereby causing the fine sand flowing out of the discharge port of the guide shell 16 to accumulate into a cone shape, exerting a more uniform thrust to the cylindrical plastic film in all directions.

[0078] After completing the compaction test of the foundation pit, the staff only needs to pull the frame 1 forward, and the frame 1 drives the L-shaped plate 24 to move backward. The lower side of the rectangular slide groove of the base plate 7 releases the squeezing of the three adjacent rollers 26 in turn, and the L-shaped plate 24 is reset under the action of the elastic force of the adjacent second elastic member 25.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A road surface compaction detection device for highway engineering, characterized in that: include: A frame (1), the frame (1) being slidably connected to a sliding block (2), and a weight measuring instrument (3) and a first elastic member (4) being fixedly connected between the frame (1) and the sliding block (2); A circular ring (5) is arranged on the sliding block (2), the circular ring (5) is detachably connected to a sand filling cylinder (6), and the sand filling cylinder (6) is provided with a valve and a rotating rod for controlling the opening and closing of the valve; A base plate (7) is arranged on one side of the frame (1), the base plate (7) is provided with a through hole, the base plate (7) is fixedly connected to a fixing ring (8), the fixing ring (8) is slidably connected to a plurality of sliding frames (9), the sliding frames (9) are fixedly connected to a first magnet (10), the first magnet (10) is detachably connected to a second magnet (11), a plastic film is detachably connected between all the first magnets (10) and all the second magnets (11), and the sliding frames (9) are fixedly connected to an extrusion column (12); A rotating ring (13) is rotatably connected to the base plate (7), the rotating ring (13) is provided with inclined grooves having the same number as the sliding frame (9), the extrusion column (12) is located in adjacent inclined grooves on the rotating ring (13), and the rotating ring (13) is fixedly connected with a handle (14).

2. A road surface compaction detection device for highway engineering according to claim 1, characterized in that: Also includes: A material discharge assembly is arranged on the ring (5) and is used to change the filling method of fine sand. The material discharge assembly comprises: A hydraulic push rod (15) is fixedly connected to the sliding block (2), and a telescopic portion of the hydraulic push rod (15) is fixedly connected to the ring (5); The material guide shell (16) is fixedly connected to the circular ring (5), and the material guide shell (16) is communicated with the sand filling cylinder (6).

3. A road surface compaction detection device for highway engineering according to claim 2, characterized in that: Also includes: The extrusion assembly is arranged on the frame (1) and is used to automatically squeeze the rotating rod of the sand filling cylinder (6) to make it swing as the material guide shell (16) moves up and down. The extrusion assembly comprises: The first trapezoidal plate (18) is fixedly connected to the frame (1), and the frame (1) is fixedly connected to a second trapezoidal plate (19). The first trapezoidal plate (18) and the second trapezoidal plate (19) are both used to squeeze the rotating rod of the sand filling cylinder (6).

4. A road surface compaction detection device for highway engineering according to claim 2, characterized in that: The material guide shell (16) is provided with an air inlet cavity, a plurality of ventilation cavities and air outlet holes the same number as the plurality of ventilation cavities; the air inlet cavity of the material guide shell (16) is connected to the plurality of ventilation cavities; the air outlet holes of the material guide shell (16) are connected to the ventilation cavities of adjacent material guide shells (16); and the air inlet cavity of the material guide shell (16) is externally connected to a hot air supply device.

5. A road surface compaction detection device for highway engineering according to claim 4, characterized in that: The air outlet of the material guide shell (16) is inclined downward from a direction close to the axis of the ring (5) to a direction away from the axis of the ring (5).

6. A road surface compaction detection device for highway engineering according to claim 1, characterized in that: The base plate (7) is detachably connected to an insert plate (17) for blocking the through hole of the base plate (7).

7. A road surface compaction detection device for highway engineering according to claim 4, characterized in that: Also includes: An adjusting component is arranged on the material guide shell (16) and is used to change the opening size of the plastic film according to the volume of fine sand filled in the test pit. The adjusting component comprises: A telescopic rod (20) is fixedly connected to the material guide shell (16); a telescopic end of the telescopic rod (20) is fixedly connected to a connecting frame (21); the connecting frame (21) is rotatably connected to a rotating block (22); the rotating block (22) is used to squeeze the handle (14); there is resistance between the base plate (7) and the rotating ring (13); and there is resistance between the telescopic portion and the fixed portion of the telescopic rod (20); A limit block (23) is fixedly connected to the connecting frame (21), and the limit block (23) is used to limit the rotation block (22). The rotation ring (13) is located on the moving path of the limit block (23).

8. A road surface compaction detection device for highway engineering according to claim 1, characterized in that: Also includes: The L-shaped plate (24) is slidably connected to the frame (1), and the base plate (7) is provided with a rectangular sliding groove, and the rectangular sliding groove of the base plate (7) is used to limit the L-shaped plate (24).

9. A road surface compaction detection device for highway engineering according to claim 8, characterized in that: Also includes: A second elastic member (25) is fixedly connected between the L-shaped plate (24) and the frame (1); There are a plurality of rollers (26) which are rotatably connected to the L-shaped plate (24) and are used to reduce the thrust on the base plate (7).

10. A road surface compaction detection device for highway engineering according to claim 1, characterized in that: A plurality of rectangular notches are provided on the lower side of the base plate (7) to reduce the influence of small stones on the road surface on the levelness of the base plate (7).

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