A road compaction testing device

Abstract

This patent discloses a road compaction testing device, including a positioning frame, a ring cutter, and a testing plate. A clearance hole is provided at the center of the lower wall of the positioning frame, through which the ring cutter can penetrate the lower wall of the positioning frame. An annular guide tube is installed on the lower wall of the positioning frame, positioned outside the clearance hole and concentrically with it. A pressure plate is slidably installed on the inner side of the positioning frame, and a top ring is installed on the lower wall of the pressure plate. The top ring has the same diameter as the ring cutter and can be inserted into the annular guide tube to hold the ring cutter. This device, by providing an annular guide tube on its positioning frame, guides the ring cutter during the hammering process into the soil, thus preventing the ring cutter from deflecting and affecting the accuracy of the test results. Simultaneously, the pressure plate used to strike the ring cutter is slidably installed on the positioning frame through a fit between a collar and a connecting post, preventing deflection during striking and preventing uneven force on the ring cutter.

Description

Technical Field

[0001] This patent relates to the field of compaction testing technology, specifically a road surface compaction testing device. Background Technology

[0002] In road construction, pavement compaction is one of the key indicators for measuring the quality of pavement construction, which directly affects the load-bearing capacity, durability and service life of the road. At present, among the commonly used pavement compaction testing methods, the ring cutter method is widely used due to its simple operation and low cost. When using the traditional ring cutter method to test road compaction, operators usually manually press or hammer the ring cutter into the road surface, which has many problems. On the one hand, due to the lack of precise positioning and guiding devices, the ring cutter is prone to deviation during insertion, resulting in unrepresentative soil samples and thus affecting the accuracy of compaction test results; On the other hand, it is difficult to ensure that the ring cutter is inserted vertically into the road surface during operation, resulting in gaps between the ring cutter and the road surface. This not only increases the difficulty of sampling but also introduces measurement errors. In addition, existing ring cutter detection devices cannot intuitively determine whether the device is in a horizontal state during the detection process, which further reduces the reliability of the detection results. Utility Model Content

[0003] The purpose of this patent is to provide a road surface compaction testing device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this patent provides the following technical solution: a road compaction testing device, comprising a positioning frame, a ring cutter and a testing plate, wherein a clearance hole is provided at the center of the lower wall of the positioning frame, and the ring cutter can penetrate the lower wall of the positioning frame through the clearance hole; An annular guide tube is installed on the lower wall of the positioning frame. The annular guide tube is located outside the clearance hole and is concentric with the clearance hole. A pressure plate is slidably installed on the inner side of the positioning frame. A top ring is installed on the lower wall of the pressure plate. The diameter of the top ring is the same as that of the ring cutter. The top ring can be inserted into the annular guide tube to support the ring cutter. A detection plate can be inserted and installed above the annular guide tube, and a tubular level is installed on the upper wall of the detection plate.

[0005] Preferably, the positioning frame includes a base plate, an upper plate, and connecting columns. Connecting columns are installed at the four corners of the upper wall of the base plate. The upper wall of the connecting column is installed on the lower wall of the upper plate. The connecting column is perpendicular to the base plate and the upper plate. Collars are installed at the four corners of the pressure plate. The collars are sleeved on the outside of the connecting columns. The pressure plate is slidably installed on the outside of the connecting columns through the collars.

[0006] Preferably, a fixing rod is installed on the upper wall of the pressure plate, and a through hole is opened in the middle of the upper wall of the upper plate, through which the fixing rod passes through the upper wall of the upper plate.

[0007] Preferably, the fixing rod includes a rod body, a handle, and a hammer block. One end of the rod body is installed at the center of the upper wall of the pressure plate, and the other end of the rod body is equipped with a handle. The hammer block has an annular cross-section and is sleeved on the outside of the rod body.

[0008] Preferably, the outer side of the hammer block is fitted with an anti-slip rubber sleeve.

[0009] Preferably, a convex ring is installed on the lower wall of the detection plate, and the convex ring can be inserted into the inner side of the annular guide tube.

[0010] Compared with existing technologies, the beneficial effects of this patent are: This device uses an annular guide tube on its positioning frame to guide the ring cutter during the process of hammering it into the soil, thereby preventing the ring cutter from deflecting and affecting the accuracy of the test results. At the same time, the pressure plate used to strike the ring cutter is slidably installed on the positioning frame through the cooperation between the collar and the connecting column, so there will be no deflection during the strike, preventing uneven force on the ring cutter. In addition, this device is equipped with a detection plate, which allows the tubular level on the detection plate to detect the levelness of the positioning frame before the ring cutter is inserted. When the positioning frame is in a level state, the ring cutter is placed into the clearance hole and inserted to ensure that the ring cutter can be inserted vertically into the external soil for sampling. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this patent.

[0012] Figure 2 This is a schematic diagram of the cross-sectional structure of the annular guide tube of this patent.

[0013] Figure 3 This is a schematic diagram of the pressure plate structure of this patent.

[0014] In the diagram: 1. Positioning frame, 2. Ring cutter, 3. Convex ring, 4. Clearance hole, 5. Annular guide tube, 6. Pressure plate, 7. Top ring, 8. Detection plate, 9. Tubular level, 10. Collar ring, 11. Base plate, 12. Top plate, 13. Connecting column, 14. Fixing rod, 141. Rod body, 142. Handle, 143. Hammering block, 15. Anti-slip rubber sleeve. Detailed Implementation

[0015] The technical solutions of this patent embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this patent, and not all of them. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0016] Please see Figure 1-3 This patent provides a technical solution: a road compaction testing device, including a positioning frame 1, a ring cutter 2 and a testing plate 8. A clearance hole 4 is provided at the center of the lower wall of the positioning frame 1. The ring cutter 2 can penetrate the lower wall of the positioning frame 1 through the clearance hole 4. The clearance hole 4 at the center of the lower wall of the positioning frame 1 provides a channel for the ring cutter 2 to penetrate the bottom plate 11 of the lower wall of the positioning frame 1 and insert into the road surface. A ring guide tube 5 is installed on the lower wall of the positioning frame 1. The ring guide tube 5 is made of high-strength, wear-resistant metal material and has a certain thickness to ensure its structural strength and guiding stability. The ring guide tube 5 is set on the outside of the relief hole 4 and is concentric with the relief hole 4. A pressure plate 6 is slidably installed on the inner side of the positioning frame 1. A top ring 7 is installed on the lower wall of the pressure plate 6. The diameter of the top ring 7 is the same as that of the ring cutter 2. The top ring 7 can be inserted into the ring guide tube 5 to support the ring cutter 2. The bottom surface of the top ring 7 is finely polished and has a smooth and flat surface. When it contacts the top surface of the ring cutter 2, it can achieve uniform support and avoid the ring cutter 2 from tilting or being damaged due to uneven force. The shapes of the clearance hole 4 and the annular guide tube 5 are adapted to the cross-sectional shape of the ring cutter 2. They are both circular and have the same diameter, which is slightly larger than the outer diameter of the ring cutter 2. This ensures that the ring cutter 2 can pass through smoothly and also provides preliminary guidance for the insertion process of the ring cutter 2 to a certain extent, preventing the ring cutter 2 from deviating significantly during insertion. This ensures that the ring cutter 2 can be inserted vertically and accurately into the road surface for the collection of compaction test samples. The annular guide tube 5 is fixedly installed to the lower wall of the positioning frame 1 by welding to ensure that it will not loosen during use; A detection plate 8 can be inserted and installed above the annular guide tube 5, and a tubular level 9 is installed on the upper wall of the detection plate 8; The size of the detection plate 8 is designed to match the outer diameter of the annular guide tube 5, and the protruding ring 16 below the detection plate 8 can be inserted into the annular guide tube 5, so that the detection plate 8 will not wobble significantly. The tubular level 9 is manufactured with high-precision manufacturing process and can accurately detect the horizontal state of the detection plate 8, thereby reflecting the horizontal state of the positioning frame 1, ensuring that the entire detection device is in a horizontal position during the detection process, and ensuring the accuracy of the detection results. The tubular level 9 is installed with the detection plate 8 by adhesive bonding. The installation position is carefully designed and located in the center area of ​​the upper wall of the detection plate 8 to obtain the most accurate horizontal detection effect.

[0017] Specifically, the positioning frame 1 includes a base plate 11, an upper plate 12, and connecting posts 13. Connecting posts 13 are installed at the four corners of the upper wall of the base plate 11. The upper wall of the connecting posts 13 is installed on the lower wall of the upper plate 12. The connecting posts 13 are perpendicular to the base plate 11 and the upper plate 12. Collars 10 are installed at the four corners of the pressure plate 6. The collars 10 are sleeved on the outside of the connecting posts 13. The pressure plate 6 is slidably installed on the outside of the connecting posts 13 through the collars 10. The collars 10 and the pressure plate 6 are integrally formed. A reasonable gap is set between the inner diameter of the collars 10 and the outer diameter of the connecting posts 13, which can not only ensure that the pressure plate 6 slides flexibly on the connecting posts 13, but also restrict the horizontal displacement of the pressure plate 6, making the sliding of the pressure plate 6 more stable and precise. Anchor holes are provided at the four corners of the base plate 11. Threaded anchors can be installed to fix the base plate 11 to the ground and ensure the stability of the positioning frame 1.

[0018] Specifically, a fixing rod 14 is installed on the upper wall of the pressure plate 6, and a through hole is opened in the middle of the upper wall of the upper plate 12. The fixing rod 14 passes through the upper wall of the upper plate 12 through the through hole. The diameter of the through hole is slightly larger than the outer diameter of the fixing rod 14. The gap design between the two can ensure that the fixing rod 14 passes smoothly through the upper plate 12, and can also limit the horizontal sway of the fixing rod 14 to a certain extent.

[0019] Specifically, the fixing rod 14 includes a rod body 141, a handle 142, and a hammer block 143. One end of the rod body 141 is installed at the center of the upper wall of the pressure plate 6, and the other end of the rod body 141 is equipped with a handle 142. The hammer block 143 has an annular cross-section and is fitted on the outside of the rod body 141. The operator pulls the hammer block 143 upward and then releases it. After the hammer block 143 falls naturally and contacts the boss on the rod body 141, the impact force generated by the impact is transmitted to the pressure plate 6 and the top ring 7 below, causing it to knock the ring cutter 2 into the soil for soil sampling.

[0020] Specifically, the outer side of the hammer block 143 is fitted with an anti-slip rubber sleeve 15.

[0021] Specifically, a protruding ring 3 is installed on the lower wall of the detection plate 8, and the protruding ring 3 can be inserted into the inner side of the annular guide tube 5.

[0022] Working principle: When conducting pavement compaction testing, first select a sampling location. A representative location should be chosen, avoiding sampling near soil interfaces, cracks, or cavities. Before sampling, remove surface loose soil and debris. Then, excavate a pit approximately 15-30cm in diameter and with a depth determined according to sampling requirements to expose the sampling surface. Place the positioning frame 1 into the pit, ensuring the bottom plate 11 is flush with the sampling surface. Use the tubular level 9 on the testing plate 8 to determine if the sampling surface is level. If not, further adjustments are needed until it is level. Once level, remove the testing plate 8, exposing the annular guide tube 5. Insert the ring cutter 2 into the annular guide tube 5 and slide the pressure plate 6 downwards, pressing the top ring 7 against the outside of the ring cutter 2. The next operator holds the positioning frame 1 (or the positioning frame 1 can be fixed with ground anchors), while another operator lifts the hammer block 143 and lets it fall naturally to strike the boss above the rod 141. The impact force generated by the impact is transmitted to the pressure plate 6 and the top ring 7 below, causing the ring cutter 2 to be knocked into the soil to take a soil sample. The hammer block 143 is used to strike the soil sample repeatedly until the inner wall of the ring cutter 2 is in close contact with the soil sample and the top of the ring cutter is level with or slightly lower than the surface of the soil sample. Then, the soil sample is cut open around the ring cutter 2 with a soil cutter and the ring cutter and soil sample are carefully removed together. Care should be taken to avoid the soil sample falling out of the ring cutter 2 or being disturbed (the entire soil can also be turned over with a shovel to remove the ring cutter 2). Then the ring cutter 2 can be weighed and the compaction degree can be calculated. The calculation formula is existing technology and is public information, so it will not be elaborated on in this article.

[0023] It will be apparent to those skilled in the art that this patent is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this patent. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this patent is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this patent. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0024] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A road surface compaction testing device, comprising a positioning frame (1), a ring cutter (2), and a testing plate (8), characterized in that: A clearance hole (4) is provided at the center of the lower wall of the positioning frame (1), and the ring cutter (2) can penetrate the lower wall of the positioning frame (1) through the clearance hole (4); The lower wall of the positioning frame (1) is equipped with an annular guide tube (5), which is located outside the relief hole (4). The annular guide tube (5) and the relief hole (4) are concentrically arranged. A pressure plate (6) is slidably installed on the inner side of the positioning frame (1). A top ring (7) is installed on the lower wall of the pressure plate (6). The diameter of the top ring (7) is the same as that of the ring cutter (2). The top ring (7) can be inserted into the annular guide tube (5) to support the ring cutter (2). A detection plate (8) can be inserted and installed above the annular guide tube (5), and a tubular level (9) is installed on the upper wall of the detection plate (8).

2. The road compaction testing device according to claim 1, characterized in that: The positioning frame (1) includes a base plate (11), an upper plate (12) and a connecting column (13). The connecting column (13) is installed at each of the four corners of the upper wall of the base plate (11). The upper wall of the connecting column (13) is installed on the lower wall of the upper plate (12). The connecting column (13) is perpendicular to the base plate (11) and the upper plate (12). The pressure plate (6) is installed at each of the four corners of the pressure plate (6). The pressure plate (6) is fitted on the outside of the connecting column (13). The pressure plate (6) is slidably installed on the outside of the connecting column (13) through the pressure plate (10).

3. The road compaction testing device according to claim 2, characterized in that: A fixing rod (14) is installed on the upper wall of the pressure plate (6), and a through hole is opened in the middle of the upper wall of the upper plate (12). The fixing rod (14) passes through the through hole to penetrate the upper wall of the upper plate (12).

4. The road compaction testing device according to claim 3, characterized in that: The fixing rod (14) includes a rod body (141), a handle (142) and a hammer block (143). One end of the rod body (141) is installed at the center of the upper wall of the pressure plate (6), and the other end of the rod body (141) is equipped with a handle (142). The hammer block (143) has an annular cross section and is sleeved on the outside of the rod body (141).

5. A road compaction testing device according to claim 4, characterized in that: The outer side of the hammer block (143) is fitted with an anti-slip rubber sleeve (15).

6. The road compaction testing device according to claim 1, characterized in that: The lower wall of the detection plate (8) is equipped with a protruding ring (3), which can be inserted into the inner side of the annular guide tube (5).

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