Simple roadbed bearing capacity detection device

Abstract

The utility model belongs to the technical field of roadbed bearing capacity detection, specifically relates to a simple roadbed bearing capacity detection device. The device includes a probe rod, a weight, a guide frame, the bottom of probe rod is connected with conical probe, its top is connected with a limiting sleeve, the bottom surface of weight is recessed with a containing hole, the aperture of containing hole is greater than the outer diameter of limiting sleeve, the weight cover is arranged outside the limiting sleeve and reciprocates along the probe rod, the guide frame is supported on the roadbed to be measured, the probe rod penetrates the guide frame, and the guide frame is used for guiding the probe rod. The utility model has simple structure, convenient operation, and one person can complete roadbed bearing capacity detection, reduces the manpower cost, improves the detection efficiency and the accuracy of detection result.

Description

Technical Field

[0001] This utility model belongs to the field of roadbed bearing capacity testing technology, specifically relating to a simple roadbed bearing capacity testing device. Background Technology

[0002] Dynamic penetration test (DPT) is a commonly used in-situ testing method in roadbed engineering investigation and quality inspection. Current test specifications stipulate the use of a heavy hammer with a mass of at least 10 kg, which is repeatedly dropped freely from a fixed height to continuously drive a metal probe with a conical probe into the soil layer to be tested. By recording the number of hammer blows required to penetrate a certain depth of the soil layer, the mechanical properties of the soil layer to be tested can be indirectly reflected.

[0003] When conducting roadbed bearing capacity testing in mountainous or narrow areas with poor transportation, manual transportation and operation of the testing equipment are usually required. However, existing testing equipment is generally complex and heavy, such as a hammer weighing at least 10 kg, which is inconvenient for a single person to carry and transport. During testing, one person usually needs to hold the probe upright while another person repeatedly raises the hammer to a certain height and then releases it, allowing the hammer to fall freely and strike the probe to penetrate the soil layer. This requires two people to operate, resulting in high labor costs. In addition, the probe is prone to tilting, making it difficult to ensure that the probe enters the soil layer of the roadbed under test vertically, which reduces the accuracy of the test results. Utility Model Content

[0004] In view of the shortcomings of the related technologies, the present invention provides a simple roadbed bearing capacity testing device to solve at least one of the technical problems mentioned in the background art.

[0005] This utility model provides a simple roadbed bearing capacity testing device, comprising: The probe rod has a conical probe connected to its bottom and a limit sleeve fitted to its top. The weight has a recessed receiving hole on its bottom surface, the diameter of which is larger than the outer diameter of the limiting sleeve; the weight is placed outside the limiting sleeve and moves back and forth along the probe. The guide frame is supported on the roadbed to be tested; the probe rod passes through the guide frame, which is used to guide the probe rod.

[0006] In some embodiments, a limiting ring is detachably connected to the bottom surface of the hammer. The limiting ring is sleeved on the probe below the limiting sleeve, and the inner diameter of the limiting ring is smaller than the outer diameter of the limiting sleeve. When the top surface of the limiting ring is against the bottom surface of the limiting sleeve, the distance between the top surface of the probe and the bottom surface of the receiving hole of the hammer is equal to the preset free fall height of the hammer.

[0007] In some embodiments, a handle is attached to the top surface of the counterweight; the total mass of the counterweight, the limiting ring, and the handle is 4.5 kg.

[0008] In some embodiments, the probe includes multiple steel rods that are detachably connected in sequence. Each steel rod has external threaded sections at both ends, and adjacent steel rods are connected by a connecting sleeve. The connecting sleeve and the limiting sleeve both have internal threads that are adapted to the external threaded sections. The tail end of the probe is recessed with a threaded bottom hole that is adapted to the external threaded sections of the steel rods.

[0009] In some embodiments, each steel rod has multiple marking lines with preset spacing along its length; the total length of each steel rod is equal to an integer multiple of the preset spacing.

[0010] In some embodiments, the guide frame includes two limiting frames that are spaced apart vertically and centered. Each limiting frame has at least three guide wheel sets arranged at equal angular intervals around its center. All the guide wheel sets on the two limiting frames together clamp the probe rod.

[0011] In some embodiments, each guide wheel assembly includes a mounting base and guide rollers; the mounting base is connected to the limiting frame; the guide rollers are rotatably connected to the side of the mounting base facing the center of the limiting frame; the wheel axis of the guide rollers is perpendicular to the axis of the probe; the wheel surfaces of all guide rollers are used to jointly clamp the probe.

[0012] In some embodiments, each guide wheel assembly further includes a slide, a spindle, and a compression spring; the mounting base has a recessed groove on the side facing the center of the limiting frame, one end of the slide is slidably connected to the groove, and the other end extends toward the center of the limiting frame; the guide roller is rotatably connected to the end of the slide facing the center of the limiting frame; one end of the spindle is connected to the side of the slide away from the guide roller, and the other end passes through the mounting base in a direction away from the center of the limiting frame, and the end of the spindle extending out of the mounting base is provided with a limiting boss; the compression spring is clamped between the mounting base and the slide and sleeved on the spindle.

[0013] In some embodiments, the guide roller's surface is made of rubber.

[0014] Based on the above technical solution, the simple roadbed bearing capacity testing device in this utility model embodiment has a simple and lightweight structure, making it easy for a single person to carry and transport. It is especially suitable for testing the roadbed bearing capacity in mountainous areas or narrow areas with inconvenient transportation. Moreover, the testing device is easy to use, and a single person can easily complete the testing operation. It is suitable for rapid testing of roadbed bearing capacity, improving testing efficiency and the accuracy of testing results. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1This is a perspective view of the simplified roadbed bearing capacity testing device of this utility model; Figure 2 This is a perspective view of the guide frame in the simplified roadbed bearing capacity testing device of this utility model; Figure 3 This is a front view of the simplified roadbed bearing capacity testing device of this utility model; Figure 4 This is a top view of the simplified roadbed bearing capacity testing device of this utility model; Figure 5 for Figure 4 AA section view; Figure 6 for Figure 5 Enlarged view of the structure at point B; Figure 7 for Figure 5 CC section view (only a guide wheel assembly is shown in partial view).

[0016] In the diagram: 1. Probe rod; 11. Limiting sleeve; 12. Steel rod; 13. Connecting sleeve; 2. Probe; 3. Counterweight; 30. Receiving hole; 31. Limiting ring; 32. Handle; 4. Guide frame; 41. Limiting frame; 42. Guide wheel assembly; 421. Mounting base; 4211. Slide groove; 422. Guide roller; 423. Axle; 424. Slide block; 425. Mandrel; 4251. Limiting boss; 426. Compression spring; 43. Connecting frame; 44. Base frame; 45. Connecting rib. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model 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 utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "top", "bottom", "inner", "outer", "left", "right", "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] refer to Figures 1-7 As shown, this utility model provides a simple roadbed bearing capacity testing device for testing the bearing capacity of loose surface soil and soft soil beneath the roadbed. The simple roadbed bearing capacity testing device includes a probe rod 1, a probe 2, a weight 3, and a guide frame 4.

[0022] The probe rod 1 is connected to the bottom of the probe 2, and the top of the probe rod 1 is fitted with a limiting sleeve 11; the probe rod 1, the probe 2, and the limiting sleeve 11 are all detachably connected. Furthermore, the inner diameter of the limiting sleeve 11 is adapted to the probe rod 1, and the outer diameter of the limiting sleeve 11 is larger than the diameter of the probe rod 1. After the limiting sleeve 11 is connected to the probe rod 1, the top surface of the limiting sleeve 11 is flush with the top surface of the probe rod 1. The tip of the probe 2 is made of a hard steel cone. The diameter of the cone probe 2 can be set to 28mm and the cone angle can be set to 60°. The diameter of the probe rod 1 can be set to 13mm, but the size design of the probe 2 and the probe rod 1 is not limited to these and can be flexibly set according to actual needs.

[0023] The bottom surface of the hammer 3 has a recessed receiving hole 30, the diameter of which is larger than the outer diameter of the limiting sleeve 11. The hammer 3 is fitted over the limiting sleeve 11, meaning that both the limiting sleeve 11 and the top of the probe rod 1 are located within the receiving hole 30 of the hammer 3, and the depth of the receiving hole 30 is greater than the height of the limiting sleeve 11. In contrast, hammers in the prior art are typically through-hole hammers fitted over the probe rod, with a through hole adapted to the probe rod. In this embodiment, the hammer 3 is only fitted over the top of the probe rod 1, and the receiving hole 30 on it is not a through hole. Therefore, the hammer 3 in this embodiment differs from the common through-hole hammer. Furthermore, the hammer 3 can reciprocate along the length direction of the probe rod 1, i.e., the axial direction of the probe rod 1. In other words, the reciprocating direction of the hammer 3 is consistent with the axial direction of the probe rod 1.

[0024] The guide frame 4 is supported on the roadbed to be tested; the probe rod 1 passes through the guide frame 4, and the guide frame 4 is used to guide the probe rod 1; specifically, the penetration direction of the probe rod 1 on the guide frame 4 is perpendicular to the roadbed to be tested.

[0025] When using this simple roadbed bearing capacity testing device to test the bearing capacity of the roadbed under test, first lift the hammer 3 to the preset height, then release the hammer 3 to let it fall freely. The hammer 3 contacts and strikes the top surface of the probe rod 1 and the limiting sleeve 11 through the bottom surface of the receiving hole 30, thereby pushing the conical probe 2 at the bottom of the probe rod 1 into the soil layer of the roadbed under test. Repeat the aforementioned lifting and releasing steps of the hammer 3 to make the probe 2 and the probe rod 1 penetrate deeper into the soil layer. During the testing process, the probe rod 1 is straightened and guided by the guide frame 4 to avoid the probe rod 1 from tilting. That is, it is not necessary to manually straighten it to ensure that the probe 2 enters the soil layer vertically. Thus, the roadbed bearing capacity test can be completed by one person lifting and releasing the hammer 3 multiple times. Therefore, it can reduce labor costs, simplify the operation process of bearing capacity testing, and improve the accuracy of the test results.

[0026] refer to Figure 1 , Figure 5 , Figure 6 As shown, in some embodiments, a limiting ring 31 is detachably connected to the bottom surface of the hammer 3, and the limiting ring 31 is also sleeved on the probe 1 below the limiting sleeve 11. The inner diameter of the limiting ring 31 is larger than the outer diameter of the probe 1 but smaller than the outer diameter of the limiting sleeve 11. When the hammer 3 is to be assembled onto the probe 1, the limiting ring 31 is first sleeved onto the probe 1, then the limiting sleeve 11 is connected to the top of the probe 1 and the top surfaces of the two are flush. Then the hammer 3 is placed over the limiting sleeve 11, and the limiting ring 31 is connected to the bottom surface of the hammer 3. When the hammer 3 is lifted upwards, when the top surface of the limiting ring 31 is against the bottom surface of the limiting sleeve 11, the distance between the top surface of the probe 1 and the bottom surface of the receiving hole 30 of the hammer 3 is equal to the preset free fall height of the hammer 3. The preset free fall height of the hammer 3 can be set to 0.3 meters, but it is not limited to this and can be flexibly set according to actual needs. By setting the limit ring 31, the lifting height of the hammer 3 can be limited each time, so that the free fall height of the hammer 3 meets the preset requirements and remains consistent, further improving the convenience of the detection operation and the accuracy of the detection results.

[0027] refer to Figure 1 , Figure 3 As shown, in some embodiments, a handle 32 is connected to the top surface of the hammer 3. The handle 32 can be arc-shaped, frame-shaped, or a hanging ring, etc. The total mass of the hammer 3, the limiting ring 31, and the handle 32 is 4.5 kg. The handle 32 facilitates manual lifting of the hammer 3. The total mass of the hammer 3 is 4.5 kg, making the detection device relatively lightweight and easy for a single person to carry. This facilitates the transportation of the detection device and the testing of roadbed bearing capacity in different locations, especially in mountainous areas or narrow areas with inconvenient transportation.

[0028] refer to Figure 1 , Figure 3 , Figure 5 , Figure 6 As shown, in some embodiments, the probe 1 includes multiple steel rods 12 that are detachably connected in sequence. Each steel rod 12 has external threaded sections at both ends along its length. Adjacent steel rods 12 are connected via connecting sleeves 13. Specifically, the connecting sleeves 13 have internal threads that match the external threaded sections of the steel rods 12, thus connecting two adjacent steel rods 12 together. The limiting sleeve 11 also has internal threads that match the external threaded sections of the steel rods 12, enabling a detachable connection between the limiting sleeve 11 and the top of the probe 1. The length of each steel rod 12 can be 1.2m, but is not limited to this and can be flexibly set according to actual needs. The tail end of the probe 2 has a threaded bottom hole that matches the external threaded section of the steel rod 12, enabling the probe 2 to connect to the probe 1. This illustrative embodiment, through the connecting sleeve 13, multiple steel rods 12, and their external threaded sections, allows for the adjustment of the probe 1's length as needed and reduces the manufacturing difficulty of the probe 1.

[0029] In some embodiments, each steel rod 12 has multiple marker lines (not shown) with preset intervals along its length; the preset intervals are typically consistent with a preset penetration depth (e.g., 0.3 meters). Further, the total length of each steel rod 12 is an integer multiple of the preset interval (i.e., the preset penetration depth), thus giving the probe rod 1, formed by connecting multiple steel rods 12, multiple equally spaced marker lines. Even further, when the probe 2 is connected to the probe rod 1, the height difference between the cone tip of the probe 2 and the lowest marker line protruding from the probe rod 1 is an integer multiple of the preset interval (i.e., the preset penetration depth). During subgrade bearing capacity testing, by observing the marker lines on the probe rod 1, the depth to which the probe 2 penetrates the subgrade soil layer can be quickly determined, facilitating the recording of the number of hammer blows and the total penetration depth at each penetration depth according to the subgrade bearing capacity testing requirements.

[0030] refer to Figure 2 , Figure 3 , Figure 5 As shown, in some embodiments, the guide frame 4 includes a base frame 44 and two limiting frames 41 spaced apart and centered, both of which are located above the base frame 44. Specifically, each limiting frame 41 includes a top plate, a bottom plate, and a side plate connecting the two, so that the cross-section of the limiting frame 41 is U-shaped. Multiple reinforcing ribs are also connected between the top plate and the bottom plate to enhance the structural strength of the limiting frame 41 itself. The upper and lower limiting frames 41 are connected together by multiple connecting frames 43 spaced apart circumferentially, and the upper limiting frame 41 is connected to the base frame 44 by multiple connecting ribs 45 spaced apart circumferentially and extending obliquely. The connection frames 43 and connecting ribs 45 improve the overall structural strength of the guide frame 4, ensuring its structural stability and reliability.

[0031] Furthermore, each limiting frame 41 is provided with at least three guide wheel sets 42 at equal angular intervals around its center. Each guide wheel set 42 protrudes towards the center of the limiting frame 41. The multiple guide wheel sets 42 on each limiting frame 41 enclose a space that matches the outer diameter of the probe rod 1. All the guide wheel sets 42 on the two limiting frames 41 together clamp the probe rod 1. Through the two limiting frames 41 and their guide wheel sets 42 arranged vertically and centered, the guide frame 4 can reliably hold and straighten the probe rod 1, ensuring that the axis of the probe rod 1 remains perpendicular to the roadbed under test during the roadbed bearing capacity testing process, thereby ensuring that the probe 2 enters the soil layer of the roadbed under test vertically.

[0032] refer to Figure 2 , Figure 5 , Figure 6 As shown, in some embodiments, each guide wheel assembly 42 includes a mounting base 421 and a guide roller 422; the mounting base 421 is connected to the limiting frame 41; the guide roller 422 is rotatably connected to the side of the mounting base 421 facing the center of the limiting frame 41; the axle 423 of the guide roller 422 is perpendicular to the axis of the probe 1; the wheel surfaces of all guide rollers 422 are used to jointly clamp the probe 1. Further, when the probe 2 and probe 1 penetrate into the soil layer of the roadbed to be tested under the hammering action of the weight 3, since the guide roller 422 can rotate around its axle 423, the probe 1 and the guide roller 422 are in a state of rolling friction, with low frictional resistance. Therefore, under the rotation and guidance of all guide rollers 422, the probe 1 can move smoothly within the guide frame 4.

[0033] refer to Figure 2 , Figure 5 , Figure 6As shown, in some embodiments, each guide wheel assembly 42 further includes a slide 424, a spindle 425, and a compression spring 426. The mounting base 421 has a recessed groove 4211 on the side facing the center of the limiting frame 41. One end of the slide 424 is slidably connected to the groove 4211, and the other end extends towards the center of the limiting frame 41. The slide 424 can move towards or away from the center of the limiting frame 41 under external force. The guide roller 422 is rotatably connected to the end of the slide 424 facing the center of the limiting frame 41; the wheel surface of the guide roller 422 abuts against the probe 1. One end of the spindle 425 is connected to the side of the slide 424 away from the guide roller 422, and the other end passes through the mounting base 421 in a direction away from the center of the limiting frame 41. The end of the spindle 425 extending out of the mounting base 421 has a limiting boss 4251; the outer diameter of the limiting boss 4251 is larger than the diameter of the through hole of the spindle 425 on the mounting base 421. Compression spring 426 is clamped between mounting base 421 and slide 424 and sleeved on spindle 425. By setting compression spring 426, the slide 424 in each guide wheel group 42 on each limiting frame 41 tends to move towards the center of limiting frame 41, so that the wheel surfaces of multiple guide rollers 422 are reliably pressed against probe 1 and together hold probe 1 tightly.

[0034] It should be noted that during the process of the probe 1 being hammered and moving downwards along the guide frame 4, when the connecting sleeve 13 moves to the guide wheel assembly 42, because the outer diameter of the connecting sleeve 13 is larger than the outer diameter of the probe 1, the guide rollers 422, under the action of the connecting sleeve 13, drive the slide block 424 to move synchronously away from the center of the limiting frame 41. Multiple guide rollers 422 together grip the connecting sleeve 13, and at this time, the compression spring 426 is compressed and stores force. When the probe 1 is hammered and continues to move downwards until the connecting sleeve 13 disengages from the guide wheel assembly 42, the slide block 424, under the spring force of the compression spring 426, drives the guide rollers 422 to move synchronously towards the center of the limiting frame 41, and multiple guide rollers 422 again grip the probe 1. Furthermore, the upper and lower parts of the outer wall of the connecting sleeve 13 are provided with guide ramps to allow the guide rollers 422 to more smoothly press against or disengage from the connecting sleeve 13.

[0035] In some embodiments, the surface of the guide roller 422 is made of rubber to prevent the guide frame 4 from damaging or destroying the probe 1 when the probe 1 moves.

[0036] Those skilled in the art will understand that by using a roadbed bearing capacity testing device to drive probe 2 into the soil layer of the roadbed to be tested, and recording the number of hammer blows required to penetrate to a certain depth in the soil layer, the mechanical properties of the soil layer of the roadbed to be tested can be evaluated. These data can provide important references for roadbed design, especially for the foundation design of lightly loaded structures. By continuously penetrating and recording the changes in the number of hammer blows, the starting and ending depths of the soft soil layer can be roughly determined, which is of great significance for evaluating the stability and settlement characteristics of the roadbed. The number of hammer blows is correlated with the N value of the standard penetration test and the cone tip resistance of the cone dynamic penetration test.

[0037] The following is combined with Figures 1-7 This section briefly describes the main steps for testing the bearing capacity of a roadbed using the simplified roadbed bearing capacity testing device of this invention: 1) Assembly of the detection device, which includes: Assemble the probe rod 1, specifically by applying grease to the external thread section of the steel rod 12 and connecting multiple steel rods 12 together through the connecting sleeve 13 to form the probe rod 1; Installing probe 2 specifically includes passing probe rod 1 through guide frame 4 and connecting conical probe 2 to the bottom of probe rod 1; marking lines are set at height positions of 0.3 meters on probe 2 and probe rod 1, starting from the tip of the cone at the head of probe 2. Install the 4.5kg weight assembly (weight 3, handle 32 and limiting ring 31), specifically including: putting the limiting ring 31 on the upper part of the probe rod 1, connecting the limiting sleeve 11 to the top of the probe rod 1 and making the top surfaces of the two flush, then covering the weight 3 with the handle 32 installed on the outside of the limiting sleeve 11, and then connecting the limiting ring 31 to the bottom surface of the weight 3.

[0038] 2) Preparations before testing include placing the guide frame 4 on the roadbed to be tested at the testing site, and ensuring that the tip of the cone probe 2 is in contact with the ground surface of the roadbed to be tested. During the testing process, the probe rod 1 is always kept perpendicular to the ground.

[0039] 3) Perform the detection operation, which includes: Raise the hammer 3 upwards until the top surface of the limiting ring 31 is close to the bottom surface of the limiting sleeve 11. At this time, the distance between the bottom surface of the receiving hole 30 of the hammer 3 and the top surface of the probe rod 1 (that is, the top surface of the limiting sleeve 11) reaches the preset free fall height of the hammer 3 of 0.3 meters. Release the hammer 3 to let it fall freely to hammer the probe rod 1 and the top surface of the limiting sleeve 11, pushing the conical probe 2 into the soil layer of the roadbed to be tested. Repeat raising and releasing the hammer 3 to make the probe 2 and the probe rod 1 continuously penetrate into the soil layer. During this period, observe the relationship between the marking line and the ground surface of the roadbed to be tested. When the first 0.3-meter marking line is flush with the ground surface of the roadbed to be tested, record the number of hammer blows required for the first penetration of 0.3 meters. Continue hammering according to the above steps and record the number of hammer blows required for each penetration of 0.3 meters.

[0040] It should be noted that as the probe 2 and probe rod 1 continue to penetrate deeper into the soil, when the lagging hammer 3 gets closer to the guide frame 4, the hammer 3 is removed from the probe rod 1, and the limiting sleeve 11 at the top of the probe rod 1 is removed. At least one steel rod 12 is then connected to the top of the current probe rod 1 through the connecting sleeve 13. The limiting sleeve 11 is installed on the top of the extended probe rod 1, and then the hammer 3 is placed back over the limiting sleeve 11 and connected to the limiting ring 31. Markings are set at 0.3-meter height positions on the extended section of the probe rod 1, starting from the uppermost marking line of the probe rod 1 before extension.

[0041] Continue hammering until the required number of hammer blows is achieved to penetrate to a depth of 0.3 meters. If the number of hits exceeds the preset threshold (e.g., 150 hits), or the total penetration depth reaches the preset depth threshold (e.g., 15 meters), the detection will terminate, with the first result being valid.

[0042] 4) Calculate the bearing capacity of the roadbed to be tested, specifically including: Number of hammer blows At that time, bearing capacity ; Number of hammer blows At that time, bearing capacity ; Number of hammer blows lie in Within the range, bearing capacity ; Number of hammer blows When the number of cycles exceeds 150, it indicates that the load-bearing capacity is sufficient.

[0043] 5) After the test is completed, remove the hammer 3, use a lifting device to pull the probe rod 1 and probe 2 out of the soil, disconnect the connection between probe 2, probe rod 1 and guide frame 4, and the probe rod 1 can also be disassembled into multiple steel rods 12; clean and lubricate each part before storing it.

[0044] In summary, the simple roadbed bearing capacity testing device of this utility model has a simple, compact, and lightweight overall structure, making it easy for a single person to carry and transport. It is not limited by location and is especially suitable for testing roadbed bearing capacity in mountainous areas or narrow areas with inconvenient transportation. Moreover, the testing device is easy to use, and a single person can easily complete the testing operation. It is suitable for rapid testing of roadbed bearing capacity, improving testing efficiency and the accuracy of test results.

[0045] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0046] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A simple roadbed bearing capacity testing device, characterized in that, include: The probe rod has a conical probe connected to its bottom and a limit sleeve fitted to its top. The weight has a recessed receiving hole on its bottom surface, the diameter of which is larger than the outer diameter of the limiting sleeve; the weight is covered outside the limiting sleeve and moves back and forth along the probe. A guide frame is supported on the roadbed to be tested; the probe rod passes through the guide frame, and the guide frame is used to guide the probe rod.

2. The simplified roadbed bearing capacity testing device according to claim 1, characterized in that, A limiting ring is detachably connected to the bottom surface of the hammer. The limiting ring is sleeved on the probe below the limiting sleeve. The inner diameter of the limiting ring is smaller than the outer diameter of the limiting sleeve. When the top surface of the limiting ring is against the bottom surface of the limiting sleeve, the distance between the top surface of the probe and the bottom surface of the receiving hole of the hammer is equal to the preset free fall height of the hammer.

3. The simplified roadbed bearing capacity testing device according to claim 2, characterized in that, A handle is connected to the top surface of the hammer; the total mass of the hammer, the limiting ring, and the handle is 4.5 kg.

4. The simplified roadbed bearing capacity testing device according to claim 1, characterized in that, The probe includes multiple steel rods that are detachably connected in sequence. Each steel rod has external threaded sections at both ends, and adjacent steel rods are connected by a connecting sleeve. The connecting sleeve and the limiting sleeve both have internal threads that are compatible with the external threaded sections. The tail end of the probe is recessed with a threaded bottom hole that is compatible with the external threaded sections of the steel rods.

5. The simplified roadbed bearing capacity testing device according to claim 4, characterized in that, Each of the steel rods has multiple marking lines with preset spacing along its length; the total length of each steel rod is equal to an integer multiple of the preset spacing.

6. The simplified roadbed bearing capacity testing device according to claim 1, characterized in that, The guide frame includes two limiting frames that are spaced apart vertically and centered. Each limiting frame has at least three guide wheel sets arranged at equal angular intervals around its center. All the guide wheel sets on the two limiting frames together clamp the probe rod.

7. The simplified roadbed bearing capacity testing device according to claim 6, characterized in that, Each of the guide wheel assemblies includes a mounting base and a guide roller; the mounting base is connected to the limiting frame; the guide roller is rotatably connected to the side of the mounting base facing the center of the limiting frame; the wheel axis of the guide roller is perpendicular to the axis of the probe; the wheel surfaces of all the guide rollers are used to clamp the probe together.

8. The simplified roadbed bearing capacity testing device according to claim 7, characterized in that, Each guide wheel assembly further includes a slide block, a spindle, and a compression spring; the mounting base has a recessed groove on the side facing the center of the limiting frame, one end of the slide block is slidably connected to the groove, and the other end extends toward the center of the limiting frame; the guide roller is rotatably connected to the end of the slide block facing the center of the limiting frame; one end of the spindle is connected to the side of the slide block away from the guide roller, and the other end passes through the mounting base in a direction away from the center of the limiting frame, and the end of the spindle extending out of the mounting base is provided with a limiting boss; the compression spring is sandwiched between the mounting base and the slide block and sleeved on the spindle.

9. The simplified roadbed bearing capacity testing device according to claim 7, characterized in that, The guide roller has a rubber surface.

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