A lightweight cone dynamic penetrometer
By integrating the guide rod limiting component with the probe rod and using an internal thread, the problems of loose connections and complex assembly of the power penetrometer are solved, resulting in higher connection stability and measurement data accuracy, and simplifying the operation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN CITY SHUNDE DISTRICT CONSTR ENG QUALITY & SAFETY SUPERVISION & TESTING CENT
- Filing Date
- 2025-05-24
- Publication Date
- 2026-06-30
Smart Images
Figure CN224431393U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of engineering exploration and testing, and in particular to a lightweight cone dynamic penetrometer. Background Technology
[0002] Dynamic penetrometers occupy an important position in the field of geotechnical engineering investigation. As a commonly used in-situ testing device, it uses a free-falling hammer to impact the probe rod, allowing the probe to penetrate into the soil layer. It can help staff judge key parameters such as soil compaction and bearing capacity based on penetration resistance or hammer blow count. These parameters play a crucial role in scenarios such as soil mechanical property testing, foundation bearing capacity assessment, and pile foundation construction quality inspection.
[0003] Currently, conventional dynamic penetrometers mainly use threaded connections for structural assembly. This method fixes the probe rod and guide rod by the interaction of external and internal threads. The advantage of this method is that it is relatively easy to assemble and disassemble. However, dynamic penetrometers using this method have poor connection stability. For example, the threads are prone to loosening due to wear, which may cause stress concentration at the splice and reduce the overall strength. When the weight falls freely, it may cause the connection to break or bend, affecting the transmission of force and leading to deviations in measurement data. Moreover, the on-site assembly process is complicated, and splicing errors can accumulate, making calibration difficult, consuming a lot of time, increasing maintenance costs, and requiring frequent replacement of connectors. Utility Model Content
[0004] To improve the accuracy of measurement data, this application provides a lightweight cone dynamic penetrometer.
[0005] This application provides a lightweight cone dynamic penetrometer, which adopts the following technical solution:
[0006] A lightweight cone penetrometer includes a guide rod with a through-hole hammer sleeved on it. The through-hole hammer slides with the guide rod. A first limiting member and a second limiting member are respectively connected to both ends of the guide rod. The first and second limiting members protrude from the outer wall of the guide rod. The through-hole hammer is located between the first and second limiting members. A probe rod is connected to the end of the second limiting member away from the guide rod. A probe is connected to the end of the probe rod away from the second limiting member. The guide rod, the second limiting member, the probe rod, and the probe are integrally formed.
[0007] By adopting the above technical solution, the guide rod is provided with a first limiting member and a second limiting member at both ends, which can limit the sliding range of the hammer and allow the hammer to slide within a limited position on the guide rod. This enables the hammer to slide freely along the guide rod to perform impact actions. The second limiting member connects to the probe rod, and the probe rod connects to the probe, forming a complete detection structure. The guide rod, the second limiting member, the probe rod, and the probe are all integrally formed. This integrally formed structure avoids the loosening problem caused by wear of traditional threaded connections, improves connection stability, enhances overall strength, ensures effective force transmission during use, reduces the possibility of measurement data being affected by loosening, breakage, or bending at the connection, and improves the accuracy of the measurement data.
[0008] Optionally, the first limiting member has an assembly groove, the groove wall has an internal thread, and the end of the guide rod away from the second limiting member has an external thread that matches the internal thread.
[0009] By adopting the above technical solution, the internal thread of the assembly groove wall is matched with the external thread on the guide rod, which facilitates the installation and disassembly of the first limiting component and the guide rod, thereby making it easier to assemble and disassemble the through hammer.
[0010] Optionally, the outer wall of the guide rod is provided with a marking line. When the groove wall away from the groove opening abuts against the end of the guide rod away from the second limiting member, the first limiting member covers the marking line.
[0011] By adopting the above technical solution, the matching design of the marking line and the assembly groove can provide clear indication when installing the first limiting component, further ensuring the accuracy of the installation position, thereby effectively reducing splicing errors, reducing calibration difficulties caused by error accumulation, and improving assembly efficiency and calibration accuracy.
[0012] Optionally, the hammer has a through hole, and the guide rod is inserted into the through hole, with the outer wall of the guide rod fitting against the wall of the through hole.
[0013] By adopting the above technical solution, the close-fitting design allows the hammer to move more smoothly along the guide rod, reduces the possibility of shaking caused by impact vibration, ensures that the force is stably transmitted to the probe rod and probe, and further improves the reliability of the measurement data.
[0014] Optionally, the outer wall of the probe is provided with scale lines, which are equidistantly distributed along the axial direction of the probe.
[0015] By adopting the above technical solution, the scale lines are evenly distributed along the probe axis, which allows users to record the penetration depth of the probe more accurately and clearly, and helps to accurately judge the compactness and bearing capacity of the soil based on the penetration resistance or the number of hammer blows.
[0016] Optionally, the scale lines include open-loop grooves, which are formed on the outer wall of the probe.
[0017] By adopting the above technical solution, the open-loop groove type scale line makes it easy to clearly and accurately view the depth of the probe penetrating the soil layer, which can effectively assist the staff to more accurately judge the soil compaction and bearing capacity based on the penetration depth.
[0018] Optionally, the open-loop groove is recessed on the outer wall of the probe rod, and the groove wall adjacent to the outer wall of the probe rod is V-shaped, with the larger opening end facing the opening of the open-loop groove.
[0019] By adopting the above technical solution, the open-loop groove design with the V-shaped groove wall and the large opening facing the groove opening makes the scale lines more conspicuous and clear, making it easier for operators to read the penetration depth more accurately and quickly, and further improving measurement efficiency.
[0020] Optionally, a handle is attached to the outer wall of the hammer.
[0021] By adopting the above technical solution, operators can easily control the hammer, improving operational convenience, reducing labor intensity, and making the testing process easier and more efficient.
[0022] In summary, this application includes at least one of the following beneficial technical effects:
[0023] 1. The guide rod is equipped with a first limiting member and a second limiting member at both ends, which can limit the sliding range of the hammer and allow the hammer to slide within a limited position on the guide rod. This allows the hammer to slide freely along the guide rod to perform impact actions. The second limiting member connects to the probe rod, which in turn connects to the probe, forming a complete detection structure. The guide rod, the second limiting member, the probe rod, and the probe are all integrally molded. This integrally molded structure avoids the loosening problem caused by wear of traditional threaded connections, improves connection stability, enhances overall strength, ensures effective force transmission during use, reduces the possibility of measurement data being affected by loosening, breakage, or bending at the connection, and improves the accuracy of the measurement data.
[0024] 2. The internal thread on the assembly groove wall mates with the external thread on the guide rod, facilitating the installation and disassembly of the first limiting component and the guide rod, thereby making it easier to assemble and disassemble the through hammer.
[0025] 3. It facilitates operator control of the mandrel, improves operational convenience, reduces labor intensity, and makes the testing process easier and more efficient. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application.
[0027] Figure 2 This is a schematic diagram of the connection between the first limiting member and the guide rod in an embodiment of this application.
[0028] Figure 3 yes Figure 1Enlarged view of point A in the middle.
[0029] Explanation of reference numerals in the attached figures:
[0030] 1. Guide rod; 11. External thread; 2. Through-hole hammer; 21. Handle; 3. First limiting component; 31. Assembly groove; 4. Second limiting component; 5. Probe rod; 51. Open ring groove; 6. Probe. Detailed Implementation
[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0032] This application discloses a lightweight cone dynamic penetrometer.
[0033] Reference Figure 1 A lightweight cone penetrometer includes a guide rod 1, on which a hammer 2 is mounted. The hammer 2 slides along the guide rod 1. A first limiting member 3 and a second limiting member 4 are connected to both ends of the guide rod 1. Both the first and second limiting members 3 and 4 are cylindrical and protrude from the outer wall of the guide rod 1. The hammer 2 is located between the first and second limiting members 3 and 4, allowing it to slide along the guide rod 1 between them. The second limiting member 4 is located away from the guide rod 1. The guide rod 1, the second limiting member 4, and the probe 6 are fixedly connected to the end of the guide rod 1 away from the second limiting member 4. The guide rod 1, the second limiting member 4, the guide rod 5 and the probe 6 are integrally formed. Since there are no threaded connections, when the hammer 2 strikes the first limiting member 3 and the second limiting member 4, the connection will not loosen due to thread wear under the impact force of the hammer 2. This improves the connection stability and overall strength, reduces the possibility of loosening due to wear of the threaded connection, improves the stability of force transmission, and thus improves the accuracy of the measurement data.
[0034] Specifically, the guide rod 1 serves to support and guide the movement of the hammer 2. It is usually a slender rod-shaped structure, and the material is generally high-strength alloy steel. This material has high strength and toughness and can withstand the impact force when the hammer 2 falls. The surface of the guide rod 1 is smooth to reduce the friction with the hammer 2 and ensure that the hammer 2 can slide smoothly on the guide rod 1.
[0035] The hammer 2 is cylindrical, with a through hole on one end. The guide rod 1 is inserted into the through hole, and the outer wall of the guide rod 1 fits against the wall of the through hole, so that the hammer 2 slides against the outer wall of the guide rod 1, reducing the shaking of the hammer 2 during movement, reducing the impact of impact vibration on the connection, and improving the accuracy of the measurement data.
[0036] The outer wall of the hammer 2 is connected to a handle 21, which is in the shape of a round rod. In this example, there are two handles 21, and the two handles 21 are distributed radially along the hammer 2 to facilitate the operator to operate the hammer 2.
[0037] Reference Figure 2 The first limiting member 3 has an assembly groove 31 on one side. The groove wall of the assembly groove 31 has an internal thread. The end of the guide rod 1 away from the second limiting member 4 has an external thread 11 that matches the internal thread. The internal thread and the external thread 11 are threadedly matched. The first limiting member 3 can be fixed on the guide rod 1 by threaded connection. When installing the first limiting member 3, the assembly groove 31 needs to be aligned with the end of the guide rod 1 with the external thread 11, and then the first limiting member 3 is rotated to tighten it on the guide rod 1 by thread.
[0038] The outer wall of the guide rod 1 is marked with a marking line. When the groove wall of the assembly groove 31 away from the groove opening abuts against the end of the guide rod 1 away from the second limiting member 4, the first limiting member 3 just covers the marking line, so that when the first limiting member 3 covers the marking line, it means that the groove wall of the assembly groove 31 away from the groove opening abuts against the end of the guide rod 1 away from the second limiting member 4.
[0039] Reference Figure 3 The outer wall of the probe rod 5 is provided with scale lines, which are equidistantly distributed along the axial direction of the probe rod 5 and divide the probe rod 5 into segments with the same axial length. The scale lines are used to record the depth of the probe 6 penetrating the soil layer, making it convenient for operators to obtain measurement data.
[0040] The scale line includes an open-loop groove 51, which is formed on the outer wall of the probe rod 5 and is recessed on the outer wall of the probe rod 5. The groove wall of the open-loop groove 51 adjacent to the outer wall of the probe rod 5 is V-shaped, and the larger opening end faces the groove opening of the open-loop groove 51, making the scale line clearer and easier to read. Even when there is soil attached, the scale can be read accurately.
[0041] The probe 6 is located at the end of the probe rod 5 away from the second limiting member 4. The probe 6 is conical in shape, and the end of the probe 6 away from the second limiting member 4 is the tip of the cone, which helps to reduce the resistance when the probe 6 penetrates the soil layer.
[0042] The implementation principle of a lightweight cone penetrometer according to an embodiment of this application is as follows: When using the lightweight cone penetrometer, first insert the guide rod 1 into the through hole of the through hammer 2, ensuring that the outer wall of the guide rod 1 fits against the wall of the through hole. Then, thread the internal thread and the external thread 11 together, so that the first limiting member 3 is fixed to the end of the guide rod 1 away from the second limiting member 4 through threaded connection, until the first limiting member 3 covers the marking line. At this time, the side of the guide rod 1 away from the second limiting member 4 abuts against the groove wall of the assembly groove 31 away from the groove opening, improving the accuracy and consistency of the installation of the first limiting member 3. Since the guide rod 1, the second limiting member 4, the probe 5 and the probe 6 are integrally formed, it is only necessary to place the entire assembly in the test position, insert the probe 5 vertically into the test ground, and the operator holds the handle 21 to lift the through hammer 2 to a position close to the test ground. The first limiting member 3 is located near the end of the second limiting member 4. Then, the hammer 2 is released, and the hammer 2 falls freely along the guide rod 1 to impact the end of the second limiting member 4 near the first limiting member 3. The probe 6 penetrates the soil layer through the probe rod 5. The penetration depth is recorded by observing the scale line on the probe rod 5. The compaction and bearing capacity of the soil are judged based on the number of hammer blows. By designing the guide rod 1, the second limiting member 4, the probe rod 5 and the probe 6 as an integrated unit, the problems of loosening caused by easy wear of threaded connections and stress concentration at the splice in the prior art are avoided, thus improving the connection stability and overall strength. At the same time, the setting of scale line and marking line simplifies the assembly process, reduces the accumulation of splicing error, and improves the accuracy of measurement data. The design of the handle 21 also improves the convenience and comfort of operation, reduces the labor intensity of operators, has low maintenance costs, and extends the service life of the instrument.
[0043] The above are all preferred embodiments of this application. These embodiments are only explanations of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A lightweight cone dynamic penetrometer, characterized in that, It includes a guide rod (1) sleeved with a core-piercing hammer (2). The core-piercing hammer (2) is slidable relative to the guide rod (1). The two ends of the guide rod (1) are respectively connected with a first limiting member (3) and a second limiting member (4). The first limiting member (3) and the second limiting member (4) are protrusions provided on the outer wall of the guide rod (1). The core-piercing hammer (2) is located between the first limiting member (3) and the second limiting member (4). One end of the second limiting member (4) away from the guide rod (1) is connected with a probe rod (5), and one end of the probe rod (5) away from the second limiting member (4) is connected with a probe head (6). The guide rod (1), the second limiting member (4), the probe rod (5) and the probe head (6) are integrally formed, and there is no part with a threaded connection in the integral formation.
2. The lightweight cone dynamic penetrometer according to claim 1, characterized in that, The first limiting member (3) is provided with an assembly groove (31), and the inner wall of the assembly groove (31) is provided with internal threads. One end of the guide rod (1) away from the second limiting member (4) is provided with external threads (11) matching the internal threads.
3. The lightweight cone dynamic penetrometer according to claim 1, characterized in that, The outer wall of the guide rod (1) is provided with a marking line. When the wall of the assembly groove (31) away from the groove opening abuts against one end side of the guide rod (1) away from the second limiting member (4), the first limiting member (3) covers the marking line.
4. A lightweight cone dynamic penetrometer according to claim 1, characterized in that, The core-piercing hammer (2) is provided with a core-piercing hole, and the guide rod (1) is inserted into the core-piercing hole, and the outer wall of the guide rod (1) is in contact with the hole wall of the core-piercing hole.
5. A lightweight cone dynamic penetrometer according to claim 1, characterized in that, The outer wall of the probe rod (5) is provided with scale lines, and the scale lines are equally spaced along the axial direction of the probe rod (5).
6. A lightweight cone dynamic penetrometer according to claim 5, characterized in that, The scale lines include open-loop grooves (51), and the open-loop grooves (51) are provided on the outer wall of the probe rod (5).
7. A lightweight cone dynamic penetrometer according to claim 5, characterized in that, The open-loop grooves (51) are recessed on the outer wall of the probe rod (5). The groove walls of the open-loop grooves (51) adjacent to the outer wall of the probe rod (5) are in a shape of an inverted V, and the end with a larger opening faces the groove opening of the open-loop grooves (51).
8. A lightweight cone dynamic penetrometer according to claim 7, characterized in that, A handle (21) is connected to the outer wall of the core-piercing hammer (2).