A device and method for detecting the construction quality of a road sand and gravel layer

Abstract

The present invention relates to the technical field of quality inspection for road engineering, and specifically to a device and method for detecting the construction quality of a road sand and gravel layer, including a core drilling barrel, a drilling barrel lifting frame, a pressing plate assembly, a pressing plate lifting frame, and a mobile vehicle frame. A liftable drilling barrel lifting frame is provided on the mobile vehicle frame, and the core drilling barrel is rotatably supported on the drilling barrel lifting frame. The drilling barrel lifting frame is driven by a drilling barrel driving mechanism to lift and lower, so as to realize core sampling of the road by the core drilling barrel, thereby detecting the thickness of the road sand and gravel layer. The road surface inside and outside the core drilling barrel is compacted by the pressing plate assembly, which can eliminate the looseness and deformation of each road layer of the road caused by cutting. At the same time, the pressing plate inside the core drilling barrel can also create a sealed space, which is beneficial to taking out the drilled road core.

Description

Technical Field

[0001] The present invention relates to the technical field of quality inspection of road engineering, and in particular to a device for detecting the construction quality of a road sand and gravel layer. Background Art

[0002] During the construction process of a road, the thickness of each layer is closely related to the overall strength of the road. Generally, a road from bottom to top includes a base layer, a sand and gravel layer, and an asphalt layer. Only when the thickness of each layer is ensured can the overall strength of the road surface be guaranteed. In the "Quality Inspection and Evaluation Standard for Highway Engineering", the thickness of each structural layer is strictly controlled, which is a very important index requirement.

[0003] Currently, the commonly used detection methods mainly include the pit-digging method, the core-drilling sampling method, the short-pulse radar monitoring, etc. When taking core samples by core drilling, the prior art usually uses a drill cylinder to cut out the road core and then conducts various detections. However, when rotating and cutting the road surface, due to the vibration of the road surface materials caused by the cutting, at the same time, the cutting edge of the drill cylinder will also cause extrusion deformation to the cut road core material. At the same time, since the drilled road core loses its adhesion due to losing its connection with the road surface, the drilled road core is more likely to bulge and become loose under vibration and extrusion, and thus there will be a large error when detecting the thickness of the road core. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a device and method for detecting the construction quality of a road sand and gravel layer. By using a pressing plate assembly to compact the road surfaces inside and outside the core drilling cylinder, the looseness and deformation of each road layer caused by cutting can be eliminated. At the same time, the pressing plate inside the core drilling cylinder can also create a sealed space, which is beneficial to taking out the drilled road core.

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

[0006] A device for detecting the construction quality of a road sand and gravel layer, comprising a core drilling cylinder, a drilling cylinder lifting frame, a pressing plate assembly, a pressing plate lifting frame and a mobile vehicle frame. A liftable drilling cylinder lifting frame is arranged on the mobile vehicle frame, and the core drilling cylinder is rotatably supported on the drilling cylinder lifting frame. The drilling cylinder lifting frame is driven by a drilling cylinder driving mechanism to lift and lower, so as to realize core sampling of the road by the core drilling cylinder, thereby detecting the thickness of the road sand and gravel layer; pressing plate assemblies are arranged inside and around the periphery of the core drilling cylinder. The pressing plate assemblies are slidably supported on the mobile vehicle frame through the pressing plate lifting frame. The pressing plate lifting frame is driven by a pressing plate driving mechanism to lift and lower. When the core drilling cylinder cuts the road, the pressing plate assemblies can press the road surface inside the core drilling cylinder and the road surface outside the core drilling cylinder tightly, so as to avoid the uplift of the sand and gravel layer caused by the cutting of the core drilling cylinder on the road; the drilling cylinder lifting frame can slide up and down inside the pressing plate lifting frame to control the stroke of the pressing plate assembly inside the core drilling cylinder; when the pressing plate assembly inside the core drilling cylinder reaches the top limit position, the pressing plate assembly seals the upper end of the core drilling cylinder through a sealing assembly, so that the core drilling cylinder can separate the road core sample from the road subgrade through negative pressure.

[0007] Further, the mobile vehicle frame includes a chassis frame, a guiding gantry, moving wheels, a lower support plate, an upper support plate and guiding columns; a vertical guiding gantry is arranged in the middle of the chassis frame, moving wheels are arranged at the bottom of the chassis frame, the core drilling cylinder and the pressing plate assembly are arranged on one side of the guiding gantry, a lower support plate is arranged on the chassis frame on the other side of the guiding gantry, multiple guiding columns are arranged on the lower support plate, and an upper support plate is arranged above the guiding columns.

[0008] Further, the pressing plate lifting frame includes a pressing plate linkage frame, a top lifting seat, a bottom lifting seat and a lifting frame guiding seat; the middle of the pressing plate linkage frame is slidably arranged on the guiding gantry through a gantry guiding slider. One side of the pressing plate linkage frame is connected to the pressing plate assembly, and the other side is supported and connected to the top lifting seat and the bottom lifting seat. The top lifting seat and the bottom lifting seat are connected by a support column, and the sides of the top lifting seat and the bottom lifting seat are respectively slidably arranged on the guiding columns through the lifting frame guiding seats; the drilling cylinder lifting frame includes a lifting frame, a gantry guiding slider, a lifting frame guiding seat and a drilling cylinder support plate; the middle of the lifting frame is slidably arranged on the guiding gantry through a gantry guiding slider. One side of the lifting frame rotatably supports the core drilling cylinder through the drilling cylinder support plate, and the other side is slidably arranged on the guiding columns through the lifting frame guiding seat.

[0009] Further, the lifting frame is arranged between the top lifting seat and the bottom lifting seat; when the lifting frame touches the upper limit of the drilling cylinder on the top lifting seat, the pressing plate assembly is lower than the core drilling cylinder and can thus press the road surface tightly; when the lifting frame touches the lower limit of the drilling cylinder on the bottom lifting seat, the pressing plate assembly seals the upper end of the core drilling cylinder through the sealing assembly.

[0010] Further, the pressing plate assembly includes an outer pressing plate, an inner cylinder pressing plate, an outer pressing rod, and an inner pressing rod; the outer pressing plate is connected to the lower part of the pressing plate linkage frame through the outer pressing rod, and the inner cylinder pressing plate is connected to the lower part of the pressing plate linkage frame through the inner pressing rod; the inner pressing rod passes through the cylinder body of the core drill through a rotating support structure, and the rotating support structure includes a pressing rod shaft sealing assembly; the inner cylinder pressing plate is located inside the cylinder body and can press the road surface inside the core drill, and the outer pressing plate is arranged around the outside of the cylinder body and can press the road surface outside the core drill.

[0011] Further, a pressing plate upper limit is provided on the upper support plate, and a pressing plate lower limit is provided on the lower support plate; when the bottom lifting seat touches the pressing plate lower limit and the lifting frame touches the drill cylinder upper limit, the outer pressing plate and the inner cylinder pressing plate respectively press the road surfaces outside and inside the core drill, exposing an annular road surface to allow the cutting teeth of the cylinder body to cut; when the bottom lifting seat touches the pressing plate lower limit and the lifting frame touches the drill cylinder lower limit, the rotation drive of the cylinder body is stopped, and the inner cylinder pressing plate squeezes the pressing rod shaft sealing assembly to realize the sealing of the upper end of the cylinder body, and the drill cylinder lifting frame and the pressing plate lifting frame are controlled to rise synchronously, and the core sample of the road is taken out through the negative pressure inside the cylinder body.

[0012] Further, a rotating support bearing, a cooling pump, and a rotation drive are provided on the drill cylinder support plate, and the core drill further includes a measurement window, a rotating support platform, a transmission gear ring, and a liquid supply cavity; the cylinder body of the core drill is rotatably arranged on the rotating support bearing through the rotating support platform, a transmission gear ring is arranged at the upper end of the cylinder body, and the rotation drive meshes with the transmission gear ring through a drive gear to drive the cylinder body and the cutting teeth to rotate; the measurement window is arranged on the vertical wall of the cylinder body.

[0013] Further, the cooling pump is connected to the liquid supply cavity at the upper end of the cylinder body through a connecting pipe, and the liquid supply cavity is rotatably and sealingly connected to the cylinder body through a rotating sealing assembly, so that the liquid supply cavity is connected to the transverse connecting groove inside the upper wall of the cylinder body through a rotating connecting groove; a plurality of drill cylinder wall connecting grooves are arranged inside the vertical wall of the cylinder body, the upper ends of the drill cylinder wall connecting grooves are connected to the transverse connecting groove, and the lower ends are provided with inclined spray nozzles; after the cooling pump pumps the coolant into the liquid supply cavity, it flows out near the cutting teeth through the rotating connecting groove, the transverse connecting groove, the drill cylinder wall connecting groove, and then through the inclined spray nozzles.

[0014] Further, the inclined spray nozzles are bent, and the bending direction is towards the rear of the rotation direction of the cylinder body, which is beneficial to the coolant sprayed from the inclined spray nozzles flowing towards the cutting teeth when the cylinder body rotates.

[0015] A method for detecting the construction quality of a road gravel layer, using the above detection device, includes the following steps:

[0016] Step a: Push the mobile frame to move the detection device to the position to be detected on the road surface. Synchronously control the starting of the core drill driving mechanism and the pressing plate driving mechanism so that the outer pressing plate and the inner cylinder pressing plate of the pressing plate assembly tightly press the road surface at the position to be detected. Then stop the core drill driving mechanism and the pressing plate driving mechanism.

[0017] Step b: Control the core drill driving mechanism to start so that the cutting teeth of the core drill abut against the annular road surface exposed by the outer pressing plate and the inner cylinder pressing plate.

[0018] Step c: Start the rotary drive so that the cutting teeth of the core drill rotate to cut the road surface. At the same time, start the cooling pump to spray the coolant through the inclined nozzles near the cutting teeth to cool the cutting teeth of the core drill.

[0019] Step d: Control the core drill driving mechanism to make the core drill descend uniformly and drill the core drill into the specified depth under the road surface.

[0020] Step e: When the lifting frame touches the lower limit of the drill, stop the core drill driving mechanism and the rotary drive. At this time, the inner cylinder pressing plate presses the rod shaft seal assembly to seal the gap between the inner pressure rod and the upper end of the cylinder body of the core drill, so that a sealed space is formed inside the cylinder.

[0021] Step f: Synchronously control the starting of the core drill driving mechanism and the pressing plate driving mechanism so that the core drill and the pressing plate assembly rise synchronously. Use the negative pressure inside the cylinder to take out the drilled road core from the ground and complete the detection of the thickness of the sand and gravel layer in the road core through the measurement window on the cylinder.

[0022] Compared with the prior art, the present invention provides a device and method for detecting the construction quality of a road sand and gravel layer, having the following beneficial effects:

[0023] 1. The present invention sets an inner cylinder pressing plate inside the cylinder body of the core drill and sets outer pressing plates around the outside of the cylinder body of the core drill. The road surface at the detection position is tightly pressed by the inner cylinder pressing plate and the outer pressing plates, eliminating the looseness, uplift and deformation of the road core caused by the vibration during the cutting of the road by the core drill, making the detection of the thickness of each layer such as the sand and gravel layer of the road more accurate.

[0024] 2. Through the stroke cooperation of the core drill lifting frame and the pressing plate lifting frame, after the core drill completes the drilling and cutting of the road, the inner cylinder pressing plate can press the rod shaft seal assembly to seal the upper end of the core drill, forming a sealed space inside the core drill, and then using the negative pressure to lift the road core when the core drill rises.

[0025] 3. The present invention sends the coolant into the liquid delivery cavity through a cooling pump. The coolant is ejected through the inclined spray nozzles near the cutting teeth via the rotary communication groove, the transverse communication groove, and the drill barrel wall communication groove. The bending direction of the inclined spray nozzles faces the rear of the rotation direction of the core drilling barrel, so that after the coolant is ejected, it can flow along the inner wall of the barrel of the core drilling barrel towards the cutting teeth, thereby realizing the cooling of the cutting teeth.

[0026] 4. After the coolant of the present invention extends below the road surface, it is beneficial to further strengthen the sealing performance of the barrel of the core drilling barrel. When lifting the barrel, it is more conducive to forming a sealed space in the inner cavity of the barrel to further ensure the negative pressure effect, thereby facilitating the extraction of the road core. Brief Description of the Drawings

[0027] Figure 1 is a schematic structural view of the construction quality detection device for the sand and gravel layer of the present invention;

[0028] Figure 2 is a schematic structural view of the initial state of the detection device of the present invention;

[0029] Figure 3 is a schematic structural view of the lower limit state of the detection device of the present invention;

[0030] Figure 4 is a schematic sectional view of the detection device of the present invention;

[0031] Figure 5 is a schematic structural view of the pressure plate lifting frame of the present invention;

[0032] Figure 6 is a schematic structural view of the drill barrel lifting frame of the present invention;

[0033] Figure 7 is a schematic structural view of the core drilling barrel of the present invention;

[0034] Figure 8 is a schematic sectional view of the core drilling barrel of the present invention;

[0035] Figure 9 is a schematic structural view of the inclined spray nozzles of the communication groove of the present invention;

[0036] In the figure:

[0037] Core drilling barrel 1, barrel 11, pressure rod shaft seal assembly 111, rotary seal assembly 112, cutting teeth 12, measurement window 13, rotary support table 14, transmission gear ring 15, liquid delivery cavity 16, rotary communication groove 161, transverse communication groove 162, drill barrel wall communication groove 163, inclined spray nozzles 164;

[0038] Drill pipe lifting frame 2, lifting frame 21, gantry guiding slider 22, lifting frame guiding seat 23, drill pipe supporting plate 24, rotary support bearing 25, cooling pump 26, connecting pipe 261, rotary drive 27, drive gear 271;

[0039] Press plate assembly 3, outer press plate 31, inner cylinder press plate 32, outer pressure rod 33, inner pressure rod 34;

[0040] Press plate lifting frame 4, press plate linkage frame 35, top lifting seat 36, bottom lifting seat 37, lifting frame guiding seat 38, upper limit of drill pipe 391, lower limit of drill pipe 392;

[0041] Mobile vehicle frame 5, chassis frame 51, guiding gantry 52, mobile wheels 53, lower supporting plate 54, upper supporting plate 55, guiding column 56, upper limit of press plate 57, lower limit of press plate 58;

[0042] Drill pipe drive mechanism 6, drill pipe motor 61, drill pipe linear drive 62, drill pipe slider 63; Press plate drive mechanism 7, press plate motor 71, press plate linear drive 72, press plate slider 73; Embodiment

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Next, according to the attached Figures 1-9A detailed description of the present invention is provided. The device for detecting the construction quality of the road gravel layer of the present invention includes a core drill cylinder 1, a drill cylinder lifting frame 2, a pressing plate assembly 3, a pressing plate lifting frame 4, and a mobile vehicle frame 5. A liftable drill cylinder lifting frame 2 is provided on the mobile vehicle frame 5, and the core drill cylinder 1 is rotatably supported on the drill cylinder lifting frame 2. The drill cylinder lifting frame 2 is driven by a drill cylinder driving mechanism 6 to lift and lower, so as to realize core sampling of the road by the core drill cylinder 1, thereby detecting the thickness of the road gravel layer; a pressing plate assembly 3 is arranged inside and around the periphery of the core drill cylinder 1. The pressing plate assembly 3 is slidably supported on the mobile vehicle frame 5 through the pressing plate lifting frame 4. The pressing plate lifting frame 4 is driven by a pressing plate driving mechanism 7 to lift and lower. When the core drill cylinder 1 cuts the road, the pressing plate assembly 3 can press the road surface inside the core drill cylinder 1 and the road surface outside the core drill cylinder 1, avoiding the uplift of the gravel layer caused by the cutting of the core drill cylinder 1 on the road; the drill cylinder lifting frame 2 can slide up and down inside the pressing plate lifting frame 4 to control the stroke of the pressing plate assembly 3 inside the core drill cylinder 1; when the pressing plate assembly 3 inside the core drill cylinder 1 reaches the top limit position, the pressing plate assembly 3 seals the upper end of the core drill cylinder 1 through a sealing assembly, so that the core drill cylinder 1 can separate the road core sample from the road subgrade through negative pressure.

[0045] An inner cylinder pressing plate 32 is arranged inside the cylinder body 11 of the core drill cylinder 1, and outer pressing plates 31 are arranged around the periphery of the outside of the cylinder body 11 of the core drill cylinder 1. The road surface at the detection position is pressed tightly by the inner cylinder pressing plate 32 and the outer pressing plates 31, eliminating the looseness, uplift and deformation of the road core caused by the vibration during the cutting of the road by the core drill cylinder 1, making the detection of the thickness of each layer such as the gravel layer of the road more accurate.

[0046] As Figure 2 shown, the mobile vehicle frame 5 includes a chassis frame 51, a guiding gantry 52, moving wheels 53, a lower support plate 54, an upper support plate 55 and guiding columns 56; a vertical guiding gantry 52 is arranged in the middle of the chassis frame 51, moving wheels 53 are arranged at the bottom of the chassis frame 51, the core drill cylinder 1 and the pressing plate assembly 3 are arranged on one side of the guiding gantry 52, a lower support plate 54 is arranged on the chassis frame 51 on the other side of the guiding gantry 52, multiple guiding columns 56 are arranged on the lower support plate 54, and an upper support plate 55 is arranged above the guiding columns 56.

[0047] As Figure 5As shown in the figure, the pressing plate lifting frame 4 includes a pressing plate linkage frame 35, a top lifting seat 36, a bottom lifting seat 37, and a lifting frame guide seat 38; the middle of the pressing plate linkage frame 35 is slidably arranged on the guiding gantry 52 through the gantry guiding slider 22, one side of the pressing plate linkage frame 35 is connected to the pressing plate assembly 3, and the other side is supported and connected to the top lifting seat 36 and the bottom lifting seat 37. The top lifting seat 36 and the bottom lifting seat 37 are connected by a support column, and the sides of the top lifting seat 36 and the bottom lifting seat 37 are respectively slidably arranged on the guiding column 56 through the lifting frame guide seat 38; the core barrel lifting frame 2 includes a lifting frame 21, a gantry guiding slider 22, a lifting frame guide seat 23, and a core barrel support plate 24; the middle of the lifting frame 21 is slidably arranged on the guiding gantry 52 through the gantry guiding slider 22, one side of the lifting frame 21 rotatably supports the core sampling barrel 1 through the core barrel support plate 24, and the other side is slidably arranged on the guiding column 56 through the lifting frame guide seat 23.

[0048] Further, the lifting frame 21 is arranged between the top lifting seat 36 and the bottom lifting seat 37; when the lifting frame 21 touches the core barrel upper limit 391 on the top lifting seat 36, the pressing plate assembly 3 is lower than the core sampling barrel 1 so as to be able to press the road surface tightly; when the lifting frame 21 touches the core barrel lower limit 392 on the bottom lifting seat 37, the pressing plate assembly 3 seals the upper end of the core sampling barrel 1 through the sealing assembly.

[0049] Through the stroke cooperation of the core barrel lifting frame 2 and the pressing plate lifting frame 4, after the core sampling barrel 1 completes the drilling and cutting of the road, the inner barrel pressing plate 32 can extrude the pressure rod shaft sealing assembly 111 to realize the sealing of the upper end of the core sampling barrel 1, so that a sealed space is formed in the core sampling barrel 1, and thus the core sampling barrel 1 can lift the road core when it rises by using negative pressure.

[0050] In other embodiments, the core barrel driving mechanism 6 includes a core barrel motor 61, a core barrel linear drive 62, and a core barrel slider 63. The core barrel slider 63 is fixedly connected to the lifting frame 21, and the core barrel motor 61 drives the core barrel slider 63 to move up and down on the core barrel linear drive 62; the pressing plate driving mechanism 7 includes a pressing plate motor 71, a pressing plate linear drive 72, and a pressing plate slider 73. The pressing plate slider 73 is fixedly connected to the bottom lifting seat 37, and the pressing plate motor 71 drives the pressing plate slider 73 to move up and down on the pressing plate linear drive 72.

[0051] As Figure 4As shown, the pressing plate assembly 3 includes an outer pressing plate 31, an inner cylinder pressing plate 32, an outer pressing rod 33, and an inner pressing rod 34; the outer pressing plate 31 is connected to the lower part of the pressing plate linkage frame 35 through the outer pressing rod 33, and the inner cylinder pressing plate 32 is connected to the lower part of the pressing plate linkage frame 35 through the inner pressing rod 34; the inner pressing rod 34 passes through the cylinder body 11 of the core drill 1 through a rotating support structure, and the rotating support structure includes a pressing rod shaft seal assembly 111; the inner cylinder pressing plate 32 is located inside the cylinder body 11 and can press the road surface inside the core drill 1, and the outer pressing plate 31 is arranged around the outside of the cylinder body 11 and can press the road surface outside the core drill 1.

[0052] Furthermore, a pressing plate upper limit 57 is provided on the upper support plate 55, and a pressing plate lower limit 58 is provided on the lower support plate 54; when the bottom lifting seat 37 touches the pressing plate lower limit 58 and the lifting frame 21 touches the drill cylinder upper limit 391, the outer pressing plate 31 and the inner cylinder pressing plate 32 respectively press the road surfaces outside and inside the core drill 1, exposing an annular road surface to allow the cutting teeth 12 of the cylinder body 11 to perform cutting; when the bottom lifting seat 37 touches the pressing plate lower limit 58 and the lifting frame 21 touches the drill cylinder lower limit 392, the rotation drive of the cylinder body 11 is stopped, and the inner cylinder pressing plate 32 presses the pressing rod shaft seal assembly 111 to achieve the sealing of the upper end of the cylinder body 11, and the drill cylinder lifting frame 2 and the pressing plate lifting frame 4 are controlled to rise synchronously, and the road core sample is taken out through the negative pressure inside the cylinder body 11.

[0053] As Figure 7 shown, a rotating support bearing 25, a cooling pump 26, and a rotation drive 27 are provided on the drill cylinder support plate 24, and the core drill 1 further includes a measurement window 13, a rotating support platform 14, a transmission gear ring 15, and a liquid supply chamber 16; the cylinder body 11 of the core drill 1 is rotatably arranged on the rotating support bearing 25 through the rotating support platform 14, a transmission gear ring 15 is provided at the upper end of the cylinder body 11, and the rotation drive 27 meshes with the transmission gear ring 15 through a drive gear 271 to drive the cylinder body 11 and the cutting teeth 12 to rotate; the measurement window 13 is provided on the vertical wall of the cylinder body 11.

[0054] Furthermore, the cooling pump 26 is connected to the liquid supply chamber 16 at the upper end of the cylinder body 11 through a connecting pipe 261, and the liquid supply chamber 16 is rotatably and sealingly connected to the cylinder body 11 through a rotating seal assembly 112, so that the liquid supply chamber 16 communicates with the inside of the upper wall of the cylinder body 11 through a rotating communication groove 161; a plurality of drill cylinder wall communication grooves 163 are arranged in the vertical wall of the cylinder body 11, the upper end of the drill cylinder wall communication groove 163 communicates with the transverse communication groove 162, and an inclined spray port 164 is provided at the lower end; after the cooling pump 26 pumps the coolant into the liquid supply chamber 16, it flows out near the cutting teeth 12 through the rotating communication groove 161, the transverse communication groove 162, and the drill cylinder wall communication groove 163 and then through the inclined spray port 164.

[0055] The coolant is fed into the liquid delivery chamber 16 by the cooling pump 26. The coolant sprays out through the inclined spray nozzles 164 near the cutting teeth 12 via the rotary communication grooves 161, the transverse communication grooves 162, and the drill barrel wall communication grooves 163. The bending direction of the inclined spray nozzles 164 is towards the rear of the rotation direction of the core drill barrel 1, so that after the coolant sprays out, it can flow along the inner wall of the barrel body 11 of the core drill barrel 1 towards the cutting teeth 12, thereby realizing the cooling of the cutting teeth 12.

[0056] Furthermore, the inclined spray nozzles 164 are bent, and the bending direction is towards the rear of the rotation direction of the barrel body 11, which is beneficial to making the coolant sprayed out from the inclined spray nozzles 164 flow towards the cutting teeth 12 when the barrel body 11 rotates.

[0057] The working process of the present invention is as follows:

[0058] Push the mobile carriage 5 to move the detection device to the position to be detected on the road surface, and synchronously control the start of the drill barrel drive mechanism 6 and the pressing plate drive mechanism 7, so that the outer pressing plate 31 and the inner barrel pressing plate 32 of the pressing plate assembly 3 press the road surface at the position to be detected. Then stop the drill barrel drive mechanism 6 and the pressing plate drive mechanism 7; control the start of the drill barrel drive mechanism 6 to make the cutting teeth 12 of the core drill barrel 1 abut against the annular road surface exposed by the outer pressing plate 31 and the inner barrel pressing plate 32; start the rotation drive 27 to make the cutting teeth 12 of the core drill barrel 1 rotate to cut the road surface, and at the same time start the cooling pump 26 to spray the coolant through the inclined spray nozzles 164 near the cutting teeth 12 to realize the cooling of the cutting teeth 12 of the core drill barrel 1; control the drill barrel drive mechanism 6 to make the core drill barrel 1 descend uniformly and drill the core drill barrel 1 into a specified depth under the road surface; when the lifting frame 21 touches the drill barrel lower limit 392, stop the drill barrel drive mechanism 6 and the rotation drive 27. At this time, the inner barrel pressing plate 32 presses the pressure rod shaft seal assembly 111 to seal the gap between the inner pressure rod 34 and the upper end of the barrel body 11 of the core drill barrel 1, so as to form a sealed space inside the barrel body 11; synchronously control the start of the drill barrel drive mechanism 6 and the pressing plate drive mechanism 7 to make the core drill barrel 1 and the pressing plate assembly 3 rise synchronously, and use the negative pressure inside the barrel body 11 to take out the drilled road core from the ground, and complete the detection of the thickness of the sand and gravel layer in the road core through the measurement window 13 on the barrel body 11.

[0059] In other embodiments, when the lifting frame 21 touches the drill barrel lower limit 392, control the cooling pump 26 to work continuously for a predetermined time, so that a certain amount of coolant enters below the road surface, which is beneficial to further strengthening the sealing performance of the barrel body 11 of the core drill barrel 1. When lifting the barrel body, it is more beneficial to form a sealed space inside the barrel body 11 of the core drill barrel 1 to further ensure the negative pressure effect, thereby being beneficial to the extraction of the road core.

[0060] After the cylinder body 11 is lifted, the inner cylinder pressing plate 32 can be controlled to move downward to push the drilled road core out of the cylinder body 11, thus further ensuring the integrity of the road core and improving the accuracy of the gravel layer detection of the road core.

[0061] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the construction quality of a road sand and gravel layer, comprising a core drilling cylinder (1), a drilling cylinder lifting frame (2), a pressing plate assembly (3), a pressing plate lifting frame (4) and a mobile vehicle frame (5), characterized in that: A liftable drilling cylinder lifting frame (2) is provided on the mobile vehicle frame (5), and the core drilling cylinder (1) is rotatably supported on the drilling cylinder lifting frame (2). The drilling cylinder lifting frame (2) is driven by a drilling cylinder driving mechanism (6) to lift and lower, so as to realize core sampling of the road by the core drilling cylinder (1), thereby detecting the thickness of the road sand and gravel layer; Pressing plate assemblies (3) are arranged around the inside and outside of the core drilling cylinder (1). The pressing plate assemblies (3) are slidably supported on the mobile vehicle frame (5) through the pressing plate lifting frame (4). The pressing plate lifting frame (4) is driven by a pressing plate driving mechanism (7) to lift and lower. When the core drilling cylinder (1) cuts the road, the pressing plate assemblies (3) can press the road surface inside the core drilling cylinder (1) and the road surface outside the core drilling cylinder (1) tightly, so as to avoid the uplift of the sand and gravel layer caused by the cutting of the core drilling cylinder (1) on the road; The drilling cylinder lifting frame (2) can slide up and down inside the pressing plate lifting frame (4) to control the stroke of the pressing plate assembly (3) inside the core drilling cylinder (1); When the pressing plate assembly (3) inside the core drilling cylinder (1) reaches the top limit position, the pressing plate assembly (3) seals the upper end of the core drilling cylinder (1) through a sealing assembly, so that the core drilling cylinder (1) can separate the road core sample from the road subgrade through negative pressure; The mobile vehicle frame (5) includes a chassis frame (51), a guiding gantry (52), moving wheels (53), a lower support plate (54), an upper support plate (55) and guiding columns (56); A vertical guiding gantry (52) is arranged in the middle of the chassis frame (51), and moving wheels (53) are arranged at the bottom of the chassis frame (51). The core drilling cylinder (1) and the pressing plate assembly (3) are arranged on one side of the guiding gantry (52). A lower support plate (54) is arranged on the chassis frame (51) on the other side of the guiding gantry (52). Multiple guiding columns (56) are arranged on the lower support plate (54), and an upper support plate (55) is arranged above the guiding columns (56); The pressing plate lifting frame (4) includes a pressing plate linkage frame (35), a top lifting seat (36), a bottom lifting seat (37), and a lifting frame guiding seat (38); The middle of the pressing plate linkage frame (35) is slidably arranged on the guiding gantry (52) through a gantry guiding slider (22). One side of the pressing plate linkage frame (35) is connected to the pressing plate assembly (3), and the other side is supported and connected to the top lifting seat (36) and the bottom lifting seat (37). The top lifting seat (36) and the bottom lifting seat (37) are connected by a support column. The sides of the top lifting seat (36) and the bottom lifting seat (37) are respectively slidably arranged on the guiding columns (56) through the lifting frame guiding seat (38); The drilling cylinder lifting frame (2) includes a lifting frame (21), a gantry guiding slider (22), a lifting frame guiding seat (23) and a drilling cylinder support plate (24); The middle part of the lifting frame (21) is slidably arranged on the guiding gantry (52) through the gantry guiding slider (22). One side of the lifting frame (21) rotatably supports the core drill (1) through the drill cylinder support plate (24), and the other side is slidably arranged on the guiding column (56) through the lifting frame guiding seat (23).

2. The construction quality detection device for road sand and gravel layer according to claim 1, characterized in that: The lifting frame (21) is arranged between the top lifting seat (36) and the bottom lifting seat (37); When the lifting frame (21) touches the drill cylinder upper limit (391) on the top lifting seat (36), the pressing plate assembly (3) is lower than the core drill (1) and can thus press the road surface tightly; When the lifting frame (21) touches the drill cylinder lower limit (392) on the bottom lifting seat (37), the pressing plate assembly (3) seals the upper end of the core drill (1) through the sealing assembly.

3. The construction quality detection device for road sand and gravel layer according to claim 2, characterized in that: The pressing plate assembly (3) includes an outer pressing plate (31), an inner cylinder pressing plate (32), an outer pressing rod (33), and an inner pressing rod (34); The outer pressing plate (31) is connected to the lower part of the pressing plate linkage frame (35) through the outer pressing rod (33), and the inner cylinder pressing plate (32) is connected to the lower part of the pressing plate linkage frame (35) through the inner pressing rod (34); The inner pressing rod (34) passes through the cylinder body (11) of the core drill (1) through the rotary support structure, and the rotary support structure includes a pressing rod shaft sealing assembly (111); The inner cylinder pressing plate (32) is located inside the cylinder body (11) and can press the road surface inside the core drill (1), and the outer pressing plate (31) is arranged around the outside of the cylinder body (11) and can press the road surface outside the core drill (1).

4. The construction quality detection device for road sand and gravel layer according to claim 3, characterized in that: A pressing plate upper limit (57) is arranged on the upper support plate (55), and a pressing plate lower limit (58) is arranged on the lower support plate (54); When the bottom lifting seat (37) touches the pressing plate lower limit (58) and the lifting frame (21) touches the drill cylinder upper limit (391), the outer pressing plate (31) and the inner cylinder pressing plate (32) respectively press the road surfaces outside and inside the core drill (1), exposing the annular road surface to allow the cutting teeth (12) of the cylinder body (11) to perform cutting; When the bottom lifting seat (37) touches the pressing plate lower limit (58) and the lifting frame (21) touches the drill cylinder lower limit (392), the rotation drive of the cylinder body (11) is stopped, the inner cylinder pressing plate (32) squeezes the pressing rod shaft sealing assembly (111) to achieve the sealing of the upper end of the cylinder body (11), the drill cylinder lifting frame (2) and the pressing plate lifting frame (4) are controlled to rise synchronously, and the road core sample is taken out through the negative pressure inside the cylinder body (11).

5. The construction quality detection device for road sand and gravel layer according to claim 4, characterized in that: A rotary support bearing (25), a cooling pump (26) and a rotary drive (27) are provided on the core drill support plate (24). The core drill (1) further includes a measurement window (13), a rotary support platform (14), a transmission gear ring (15) and a liquid supply chamber (16); The cylinder body (11) of the core drill (1) is rotatably arranged on the rotary support bearing (25) through the rotary support platform (14). A transmission gear ring (15) is arranged at the upper end of the cylinder body (11). The rotary drive (27) meshes with the transmission gear ring (15) through a drive gear (271) to drive the cylinder body (11) and the cutting teeth (12) to rotate; The measurement window (13) is arranged on the vertical wall of the cylinder body (11).

6. The construction quality detection device for road gravel layer according to claim 5, wherein: The cooling pump (26) is connected to the liquid supply chamber (16) at the upper end of the cylinder body (11) through a connecting pipe (261). The liquid supply chamber (16) and the cylinder body (11) are rotatably and sealingly connected through a rotary sealing assembly (112), so that the liquid supply chamber (16) is communicated with the transverse communication groove (162) inside the upper wall of the cylinder body (11) through a rotary communication groove (161); A plurality of drill cylinder wall communication grooves (163) are arranged in the vertical wall of the cylinder body (11). The upper end of the drill cylinder wall communication groove (163) is communicated with the transverse communication groove (162), and an inclined spray port (164) is arranged at the lower end; After the cooling pump (26) pumps the coolant into the liquid supply chamber (16), it flows out near the cutting teeth (12) through the rotary communication groove (161), the transverse communication groove (162), the drill cylinder wall communication groove (163) and the inclined spray port (164).

7. The construction quality detection device for road gravel layer according to claim 6, wherein: The inclined spray port (164) is bent, and the bending direction faces the backward direction of the rotation direction of the cylinder body (11), which is beneficial to the coolant sprayed from the inclined spray port (164) to flow towards the cutting teeth (12) when the cylinder body (11) rotates.

8. A method for detecting the construction quality of a road sand and gravel layer, using the detection device described in claim 7, characterized in that, Including the following steps: Step a, push the mobile vehicle frame (5) to move the detection device to the position to be detected on the road surface, and synchronously control the drill cylinder drive mechanism (6) and the pressing plate drive mechanism (7) to start, so that the outer pressing plate (31) and the inner cylinder pressing plate (32) of the pressing plate assembly (3) press the road surface at the position to be detected, and then stop the drill cylinder drive mechanism (6) and the pressing plate drive mechanism (7); Step b, control the drill cylinder drive mechanism (6) to start so that the cutting teeth (12) of the core drill (1) abut against the annular road surface exposed by the outer pressing plate (31) and the inner cylinder pressing plate (32); Step c, start the rotary drive (27) to rotate the cutting teeth (12) of the core drill (1) to cut the road surface, and at the same time start the cooling pump (26) to spray the coolant through the inclined spray port (164) near the cutting teeth (12) to cool the cutting teeth (12) of the core drill (1); Step d, control the drill cylinder drive mechanism (6) to make the core drill (1) descend at a constant speed and drill the core drill (1) to a specified depth under the road surface; Step e: When the lifting frame (21) touches the lower limit of the core barrel (392), stop the core barrel drive mechanism (6) and the rotary drive (27). At this time, the inner barrel pressing plate (32) presses the pressure rod shaft seal assembly (111) to seal the gap between the inner pressure rod (34) and the upper end of the barrel body (11) of the core barrel (1), so as to form a sealed space inside the barrel body (11). Step f: Synchronously control the start of the core barrel drive mechanism (6) and the pressing plate drive mechanism (7), so that the core barrel (1) and the pressing plate assembly (3) rise synchronously, and use the negative pressure inside the barrel body (11) to take the drilled road core out of the ground, and complete the detection of the thickness of the sand and gravel layer in the road core through the measurement window (13) on the barrel body (11).

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