A pavement structure depth measuring device

Abstract

The utility model relates to road pavement engineering field especially is used for the optimization design of device for measuring road surface structure depth, a road surface structure depth measuring device, include: cross ruler, both sides edges of cross ruler are equipped with corresponding first structure depth scale and first length scale respectively, and the middle part is equipped with first through sliding slot, vertical ruler, assemble in cross ruler top, both sides edges of vertical ruler are equipped with corresponding second structure depth scale and second length scale respectively, and the middle part is equipped with second through sliding slot, ruler connecting piece, assemble in first through sliding slot and second through sliding slot, be used for connecting cross ruler and vertical ruler, make cross ruler and vertical ruler rotate around ruler connecting piece and form the cross -shaped structure of mutual perpendicular, sliding reading device, are slidably connected in first through sliding slot and second through sliding slot respectively, are used for the auxiliary positioning and reading when measuring.

Description

Technical Field

[0001] This utility model relates to the field of road pavement engineering, and in particular to the optimized design of a device for measuring the depth of pavement structure. Background Technology

[0002] Currently, my country's highway industry has entered a peak period of construction and maintenance. In the inspection of newly paved asphalt pavement or non-grooved cement concrete pavement, or in the evaluation of the technical condition of old pavement, it is necessary to conduct structural depth testing.

[0003] Traditional measurement methods involve manual sand spreading, but this method is cumbersome, highly susceptible to human error, and prone to subjectivity in measuring the paving shape and diameter, easily leading to errors. In contrast, the "Road Texture Depth Measuring Instrument and Method" disclosed in CN112482161B utilizes the physical properties of shape memory materials. By applying external pressure, the test surface precisely replicates the concave and convex shapes of the road surface's microstructure, creating a "mold" that mirrors the road surface texture. During measurement, water is injected into this replicated groove until it is filled; the volume of injected water is equivalent to the total volume of the road surface pores within a certain area. The entire measurement process requires a rotary pressure valve device with a level bubble to ensure the measurement system remains horizontal, guaranteeing the accuracy of the replication and water injection processes. Ultimately, this transforms three-dimensional road texture depth measurement into precise one-dimensional liquid volume measurement.

[0004] However, both the traditional sand-laying method and the aforementioned existing technologies have the following drawbacks: For the sand-laying method, the subsequent measurement process also faces challenges. Currently, pavement texture depth detection typically uses the manual sand-laying method. After sand is laid, a dedicated texture depth gauge can be used to measure the texture depth on the diameters of the sand-laying circle in two perpendicular directions. However, current texture depth gauges suffer from varying degrees of defects, such as inaccurate scale graduations, excessively large scale divisions, inconvenient readings, easy deformation, and susceptibility to contamination. Engineers often use a steel ruler to measure the diameter of the sand-laying circle and then calculate the texture depth. However, this method of using a steel ruler to measure the diameter of the sand-laying circle and calculate the texture depth can lead to accumulated reading and calculation errors, affecting the accuracy of the texture depth. Furthermore, the measurement is affected by the operator's skill level; regardless of whether a texture depth gauge or a steel ruler is used, deviations such as the measured dimension not being the diameter of the sand-laying circle or the two measurement directions not being perpendicular can easily occur, all of which can adversely affect the measurement results. As for the patent solution of CN112482161B, its operation process is complicated, requiring the carrying of multiple components and consumable materials, resulting in low efficiency in on-site testing. Furthermore, its accuracy is constrained by multiple factors such as the performance of memory materials, water injection operation, and leveling, making it difficult to guarantee reliability. Utility Model Content

[0005] To overcome the shortcomings of the prior art, a road surface texture depth measuring device is provided.

[0006] This utility model is achieved through the following technical solution: a road surface texture depth measuring device, comprising: a horizontal ruler, with corresponding first texture depth and first length scales on both sides of the horizontal ruler, and a first through groove in the middle; a vertical ruler, mounted above the horizontal ruler, with corresponding second texture depth and second length scales on both sides of the vertical ruler, and a second through groove in the middle; a ruler connector, mounted in the first and second through grooves, for connecting the horizontal ruler and the vertical ruler; the horizontal ruler and the vertical ruler are rotated around the ruler connector to form a mutually perpendicular cross-shaped structure; and a sliding reading device, slidably connected in the first and second through grooves, for assisting in positioning and reading during measurement.

[0007] The above solution provides a highly integrated dedicated measuring tool. The horizontal and vertical rulers are movably connected by a ruler connector to form a stable cross-shaped structure, which fundamentally ensures that the two measurement directions can be strictly perpendicular, effectively avoiding the deviation of the measurement direction caused by the operator's subjective factors in traditional methods.

[0008] The parallel first and second construction depth and length scales on the horizontal and vertical rulers provide two reading methods: direct diameter reading and construction depth conversion reading. Users can directly read the precise construction depth value to avoid the accumulation of errors caused by tedious calculations, or verify it using the length scale when needed. This solves the problem of errors introduced by steel rulers that can only measure diameter and require additional calculations. The through groove and sliding reading device located in the middle of the ruler guide the user to measure along the diameter direction through a mechanical structure, ensuring that the measured line segment is a diameter through the center of the circle rather than an arbitrary chord, greatly reducing the technical threshold of operation and the reliance on operator experience. This integrated design combines all the functional components required for measurement, eliminating the need to carry multiple additional tools, simplifying the operation process, and significantly improving the efficiency and reliability of on-site testing results.

[0009] In a preferred embodiment of this utility model, the ruler connector includes a connecting screw, a tightening nut, and a fixing nut; the fixing nut is assembled at one end of the connecting screw, and the tightening nut is screwed to the other end of the connecting screw; the connecting screw passes through the first through groove and the second through groove, the fixing nut abuts against the lower surface of the horizontal ruler, and the tightening nut abuts against the upper surface of the vertical ruler.

[0010] In a preferred embodiment of this utility model, the sliding reading device includes a connecting rod, a lower sliding block, a limiting member, and an upper sliding block; the lower sliding block is fixed to one end of the connecting rod, and the limiting member is rotatably connected to the external thread provided on the connecting rod; the upper sliding block is assembled below the limiting member to limit its contact with the upper surface of the horizontal or vertical ruler.

[0011] In a preferred embodiment of this utility model, the side of the upper sliding block is provided with a reading pointer for assisting in reading; the extension line of the reading pointer is on the same axis as the diameter of the connecting rod.

[0012] In a preferred embodiment of this utility model, the reading pointer is a cylindrical steel needle with a rounded end.

[0013] In a preferred embodiment of this utility model, the side wall of the upper sliding block is provided with a plurality of mounting holes for mounting the reading pointer.

[0014] In a preferred embodiment of this utility model, the bottom of the ruler is provided with two reinforcing ribs arranged along its length.

[0015] In a preferred embodiment of this utility model, the thickness of the reinforcing rib is greater than the thickness of the lower sliding block.

[0016] In a preferred embodiment of this utility model, the ruler connector is arranged on the side with the smaller reading of the horizontal and vertical rulers; the sliding reading device is arranged on the side with the larger reading of the horizontal and vertical rulers.

[0017] In a preferred embodiment of this utility model, the range of the first structural depth scale and the second structural depth scale are both 0.3mm to 4.0mm, and a starting scale line is provided at 0mm of the corresponding first length scale and second length scale; the graduation value of the first structural depth scale and the second structural depth scale in the range of 0.3mm to 1.5mm is 0.01mm, and the graduation value in the range of 1.5mm to 4.0mm is 0.1mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects: A pavement texture depth measuring device organically combines a horizontal ruler, a vertical ruler, a connector, and a sliding reading device into a single unit. This enables rapid and continuous measurement of the two vertical diameters of a sand-paved circle, avoiding errors and cumbersome operations caused by tool changes, and significantly improving the efficiency and convenience of field measurements. The two types of scales on the horizontal and vertical rulers (length scale and texture depth scale) provide both direct reading and converted reading methods for measurement.

[0019] Furthermore, the clamping force between the horizontal and vertical rulers can be easily adjusted by tightening and loosening the nuts. When loosened, the two rulers can slide and rotate freely, facilitating quick positioning and adjustment; when tightened, the two rulers are securely locked in the desired cross shape, preventing displacement during measurement and ensuring the stability of the measurement structure and the reliability of the results.

[0020] Furthermore, the modular design of this sliding reading device separates the "sliding" and "locking" functions. Users can easily push the entire device by hand to slide it within the groove for coarse positioning, and then fine-tune and finally fix the position of the upper sliding block by tightening the limiting piece, making it fit tightly against the ruler surface, thereby precisely locking the reading pointer, preventing pointer wobbling, and ensuring the instantaneous accuracy of the reading.

[0021] Furthermore, by setting the reading pointer and aligning its axis with the diameter of the connecting rod, the accuracy and consistency of the measurement are ensured. This design guarantees that regardless of the position of the sliding device on the scale, the pointer is perpendicular to the scale axis and directly aligned with the scale value, eliminating parallax errors that may be caused by pointer tilt or offset, and achieving standardized "alignment" readings.

[0022] Furthermore, the reading pointer is specifically embodied as a cylindrical steel needle with rounded ends, combining functionality and safety. The cylindrical steel needle provides sufficient strength to resist bending, while its small diameter (e.g., 1mm) ensures accurate readings. The rounded ends prevent sharp points from accidentally scratching the user or damaging the scale during operation, and also facilitate "tangential" rather than "intersecting" with the edge of the sanding circle, improving positioning accuracy.

[0023] Furthermore, multiple mounting holes are provided on the side wall of the upper sliding block, offering extremely high flexibility and adaptability. Users can choose the most suitable side to install the reading pointer according to their specific measurement habits, the placement of the ruler (such as horizontal or vertical), and the viewing angle, thereby always obtaining the best and most convenient observation angle and avoiding the problem of the pointer being obstructed by the hand or other parts.

[0024] Furthermore, the reinforcing ribs significantly enhance the longitudinal bending stiffness of the ruler, reduce deformation caused by the ruler's own weight or external operating forces, ensure the straightness of the measurement baseline, and improve measurement accuracy. The reinforcing ribs lift the bottom surface of the ruler off the road surface, preventing the ruler surface from being contaminated or worn by sand or dirt left on the road surface. They also provide the necessary space for movement of the lower sliding block of the sliding reading device and the nut of the ruler connector.

[0025] Furthermore, the thickness of the reinforcing rib is greater than that of the lower sliding block, ensuring the reliability of the function. This design guarantees that when the ruler is placed flat on the road surface, the bottom of the reinforcing rib contacts the road surface, while the lower sliding block (and the fixing nut below the ruler connector) is completely contained within the space created by the lifting of the reinforcing rib, without contacting or interfering with the road surface. This ensures that the sliding reading device and the ruler connector can slide and adjust smoothly and without obstruction throughout the entire process.

[0026] Furthermore, the ruler connector and the sliding reading device are positioned on the sides with smaller and larger readings, respectively, optimizing the operation process and ergonomics. Placing the ruler connector (which typically only requires one adjustment) on the side with smaller readings (usually the 0 mark) avoids interference with measurement operations when this component frequently slides in the area with larger readings. Placing the frequently moved sliding reading device on the side with larger readings better aligns with the right-handed operating habit of most people (sliding from larger to smaller readings to find the tangent point), making operation more natural and efficient.

[0027] Furthermore, the specific definition of the scale range, graduation value, and starting line for the structural depth directly meets the high-precision requirements of the pavement engineering testing specifications. The wide measurement range (0.3-4.0mm) covers various pavement conditions from smooth to rough. High-precision segmented graduation values ​​(0.01mm and 0.1mm) ensure measurement accuracy within the critical common range (0.3-1.5mm), meeting the specifications' requirements for data accuracy. The establishment of a starting graduation line ensures a clear "zero point" reference, guaranteeing that each measurement is calculated from the absolute zero point, which is the basis for converting structural depth.

[0028] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a road surface texture depth measuring device according to the present invention; Figure 2 This is a schematic diagram of the structure of the horizontal ruler of this utility model; Figure 3 This is a schematic diagram of the vertical ruler of this utility model; Figure 4 This is a schematic diagram of the ruler connector of this utility model; Figure 5 This is a schematic diagram of the sliding reading device of this utility model; Figure 6 This is a schematic cross-sectional view of the horizontal ruler of this utility model; Figure 7 This is a schematic cross-sectional view of the vertical ruler of this utility model; The annotations in the attached figures are explained as follows: Horizontal ruler 1, vertical ruler 2, ruler connector 3, sliding reading device 4, reinforcing rib 5, first structural depth scale 11, first length scale 12, first through groove 13, second structural depth scale 21, second length scale 22, second through groove 23, connecting screw 31, connecting thread 311, tightening nut 32, fixing nut 33, connecting rod 41, lower sliding block 42, limiting piece 43, upper sliding block 44, external thread 45, reading pointer 46, mounting hole 441. Detailed Implementation

[0030] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0031] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” are used only to facilitate the description of the embodiments and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] like Figures 1 to 7 As shown, the road surface texture depth measuring device of this embodiment mainly consists of a horizontal ruler 1, a vertical ruler 2, a ruler connector 3, and a sliding reading device 4.

[0033] The ruler 1 is made of stainless steel, with a total outer length of 35.5cm and a width of 3cm. The base thickness of the ruler 1 surface is 2mm. A first structural depth scale 11 is provided on the upper edge of the ruler 1, and a first length scale 12 is provided on the lower edge; the two scales correspond numerically. The first structural depth scale 11 has a range of 0.3mm to 4.0mm, with a graduation of 0.01mm in the critical range of 0.3mm to 1.5mm and a graduation of 0.1mm in the range of 1.5mm to 4.0mm. The first length scale 12 has a range of 0cm to 33cm and a graduation of 1mm. A first through groove 13 is formed along the length of the ruler 1 in the middle. This groove is a rectangular hollow area with a length of 345mm and a width of 6mm. To enhance resistance to deformation and prevent surface contamination, two reinforcing ribs 5 are provided at the bottom of the ruler 1, arranged parallel to each other along its length. The reinforcing rib 5 is 4mm wide and 4mm thick, and its thickness is greater than that of the lower sliding block 42, so as to ensure that the ruler body is lifted and provide unobstructed sliding space for the lower sliding block 42 (and the fixing nut 33 below the ruler connector 3).

[0034] The vertical ruler 2 is identical to the horizontal ruler 1 in terms of material, dimensions, scale settings, and groove specifications. The upper edge of the vertical ruler 2 is provided with a second structural depth scale 21, the lower edge is provided with a second length scale 22, and the middle is provided with a second through groove 23.

[0035] The ruler connector 3 is used to movably connect the horizontal ruler 1 and the vertical ruler 2. It consists of a connecting screw 31, a tightening nut 32, and a fixing nut 33. The connecting screw 31 passes sequentially through the first through groove 13 of the horizontal ruler 1 and the second through groove 23 of the vertical ruler 2. The fixing nut 33 is tightened at the bottom end of the connecting screw 31 and abuts against the lower surface of the horizontal ruler 1. In this embodiment, the fixing nut 33 is preferably fixed at the bottom end of the connecting screw 31; the tightening nut 32 is screwed at the top end of the connecting screw 31, and the top end of the connecting screw 31 is provided with a connecting thread 311 for screwing the tightening nut 32. By tightening or loosening, the upper surface of the vertical ruler 2 is pressed or loosened, thereby realizing the adjustment of the tightness of the connection between the two rulers, so that the vertical ruler 2 can both rotate and slide flexibly to form a cross structure, and can be reliably fixed during measurement. In this embodiment, the ruler connector 3 is preferably located at the end of the horizontal ruler 1 and the vertical ruler 2 with the smaller reading (i.e., near the 0 mark end).

[0036] There are two sliding reading devices 4, which are respectively installed on the slide grooves of the horizontal ruler 1 and the vertical ruler 2. Each sliding reading device 4 includes a connecting rod 41, a lower sliding block 42, a limiting member 43, and an upper sliding block 44. The lower sliding block 42 is fixed to the bottom end of the connecting rod 41 and is located below the lower surface of the ruler. The connecting rod 41 passes through the slide groove and has an external thread 45 on its upper part. The limiting member 43 (a nut in this embodiment) is screwed into the external thread 45. The upper sliding block 44 is sleeved on the connecting rod 41 and is located below the limiting member 43 and above the upper surface of the ruler. By tightening the limiting member 43, the upper sliding block 44 can be pressed down to generate friction with the upper surface of the ruler, thereby locking the entire sliding reading device 4 in the current position. A reading pointer 46 is installed on one side of the upper sliding block 44. The reading pointer 46 is a cylindrical steel needle with a diameter of 1 mm and its end is rounded. The extension line of the reading pointer 46 is precisely calibrated to ensure that it is on the same vertical plane as the central axis of the connecting rod 41, thereby eliminating parallax. To accommodate different measurement angles, multiple mounting holes 441 are provided on the side walls of the upper sliding block 44, allowing the user to install the reading pointer 46 in the most suitable position as needed.

[0037] The sliding reading device 4 is preferably positioned at the end of the horizontal ruler 1 and the vertical ruler 2 where the reading is larger. This reduces mutual interference between components during operation and places the most frequent operations within the most convenient and comfortable operating range, thereby reducing operator fatigue and errors and improving measurement efficiency.

[0038] The working process of a road surface texture depth measuring device is as follows: Step 1: Preparation: Spread the standard sand into a circle according to the specifications. Loosen the nut 32 of the ruler connector 3, and rotate the vertical ruler 2 to a direction approximately perpendicular to the horizontal ruler 1.

[0039] Step 2: Measure the transverse diameter: Align the starting line (0mm) of the first structural depth scale 11 on the left end of the ruler 1 with one edge of the sand-covered circle. Slide the sliding reading device 4 on the ruler 1 so that its reading pointer 46 is tangent to the other edge of the sand-covered circle. Using the left end of the ruler 1 as the rotation point, slightly rotate the ruler clockwise and counterclockwise while simultaneously adjusting the sliding reading device 4 to keep the pointer tangent to the edge of the circle until the pointer can no longer move to the right and remains tangent. At this point, the position of the ruler 1 corresponds to the transverse diameter of the sand-covered circle.

[0040] At this time, the horizontal construction depth value (e.g., 1.12 mm) indicated by the pointer can be read directly from the first construction depth scale 11 of the horizontal ruler 1, or the horizontal diameter value (e.g., 189 mm) can be read from the first length scale 12 for verification.

[0041] Step 3: Locating the Center and Vertical Ruler: Keep the horizontal ruler 1 stationary. Based on the horizontal diameter value measured in Step 1, locate its midpoint. Move the vertical ruler 2 so that the starting line (0mm) of its second structural depth scale 21 aligns with this midpoint. Using the sliding reading device 4 on the horizontal ruler 1 as a reference, ensure that the sliding reading device 4 is close to the edge of the vertical ruler 2, guaranteeing that the vertical ruler 2 and the horizontal ruler 1 are perpendicular to each other. Then, tighten the loosening nut 32 of the ruler connector 3 to fix the vertical ruler 2 in place.

[0042] Step 4: Measure the vertical diameter: Repeat the operation process of Step 2 on the vertical ruler 2. Align the starting mark (0mm) at the bottom of the vertical ruler 2 with the lower edge of the sand-laying circle. Slide the sliding reading device 4 on the vertical ruler 2 until its pointer is tangent to the upper edge of the circle and find the position of the maximum diameter. Finally, read the vertical construction depth value from the second construction depth scale 21 on the vertical ruler 2.

[0043] Step 5: Calculation and Storage: Take the average of the horizontal and vertical construction depths as the final road surface construction depth value for this measuring point. After measurement, clean the ruler body, slide each sliding device to the end of the ruler, loosen the connecting parts, rotate the vertical ruler 2 until it overlaps with the horizontal ruler 1 and then lock it, and put it into the storage box for safekeeping.

[0044] Alternatively, the readings of the lateral and vertical diameters obtained by the first length scale 12 and the second length scale 22 can be used to calculate the diameters based on the sand-laying method formula (TD = 4V / (π * D)). 2 The physical-mathematical conversion of the scale is based on the selected standard sand volume V (e.g., 25cm). 3The formula is used to calculate the construction depth (TD) from a series of diameter values ​​(D) (i.e., the readings of the transverse and vertical diameters), which can further verify the measurement data.

[0045] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A device for measuring the depth of road surface structure, characterized in that, include: A horizontal ruler (1) has corresponding first structural depth scales (11) and first length scales (12) on its two sides, and a first through groove (13) in its middle. A vertical ruler (2) is mounted above the horizontal ruler (1), and has corresponding second structural depth scales (21) and second length scales (22) on its two sides, and a second through groove (23) in its middle. A ruler connector (3) is mounted in the first through groove (13) and the second through groove (23) to connect the horizontal ruler (1) and the vertical ruler (2). The horizontal ruler (1) and the vertical ruler (2) are rotated around the ruler connector (3) to form a cross-shaped structure that is perpendicular to each other. A sliding reading device (4) is slidably connected in the first through groove (13) and the second through groove (23) to assist in positioning and reading during measurement.

2. The road surface texture depth measuring device according to claim 1, characterized in that, The ruler connector (3) includes a connecting screw (31), a tightening nut (32), and a fixing nut (33); the fixing nut (33) is assembled at one end of the connecting screw (31), and the tightening nut (32) is screwed to the other end of the connecting screw (31); the connecting screw (31) passes through the first through groove (13) and the second through groove (23), the fixing nut (33) abuts against the lower surface of the horizontal ruler (1), and the tightening nut (32) abuts against the upper surface of the vertical ruler (2).

3. The road surface texture depth measuring device according to claim 1, characterized in that, The sliding reading device (4) includes a connecting rod (41), a lower sliding block (42), a limiting member (43), and an upper sliding block (44); the lower sliding block (42) is fixed to one end of the connecting rod (41), and the limiting member (43) is rotatably connected to the external thread (45) provided on the connecting rod (41); the upper sliding block (44) is assembled below the limiting member (43) to limit it from abutting against the upper surface of the horizontal ruler (1) or the vertical ruler (2).

4. The road surface texture depth measuring device according to claim 3, characterized in that, The upper sliding block (44) has a reading pointer (46) on its side for assisting in reading; the extension line of the reading pointer (46) is on the same axis as the diameter of the connecting rod.

5. The road surface texture depth measuring device according to claim 4, characterized in that, The reading pointer (46) is a cylindrical steel needle with rounded ends.

6. The pavement texture depth measuring device according to claim 4, characterized in that, The sidewalls of the upper sliding block (44) are provided with multiple mounting holes (441) for mounting the reading pointer (46).

7. The pavement texture depth measuring device according to claim 1, characterized in that, The bottom of the horizontal ruler (1) is provided with two reinforcing ribs (5) arranged along its length.

8. The pavement texture depth measuring device according to claim 7, characterized in that, The thickness of the reinforcing rib (5) is greater than the thickness of the lower sliding block (42).

9. A road surface texture depth measuring device according to claim 1, characterized in that, The ruler connector (3) is positioned on the side with the smaller reading of the horizontal ruler (1) and the vertical ruler (2); the sliding reading device (4) is positioned on the side with the larger reading of the horizontal ruler (1) and the vertical ruler (2).

10. A road surface texture depth measuring device according to claim 1, characterized in that, The first structural depth scale (11) and the second structural depth scale (21) both have a range of 0.3mm to 4.0mm, and a starting scale line is provided at 0mm of the corresponding first length scale (12) and second length scale (22); the first structural depth scale (11) and the second structural depth scale (21) have a scale value of 0.01mm in the range of 0.3mm to 1.5mm, and a scale value of 0.1mm in the range of 1.5mm to 4.0mm.

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