Lightweight dynamic penetration test feeler lever pulling fastener and device

Abstract

The utility model belongs to the technical field of geotechnical engineering, and particularly relates to a light dynamic penetration test feeler lever pulling fastener and a light dynamic penetration test feeler lever pulling device. The pulling fastener comprises a fastening block, and a conical through hole with a large upper part and a small lower part is formed in the middle of the fastening block; the clamping piece is of a conical body structure with a large upper part and a small lower part; a vertical channel is arranged in the middle of the clamping piece; the diameter of the vertical channel is variable; the clamping piece is placed in the conical through hole; the diameter of the bottom of the conical through hole is larger than or equal to the outer diameter of the bottom of the clamping piece and smaller than the outer diameter of the top of the clamping piece. And when the fastening block moves upwards relative to the clamping piece, the clamping piece is clamped, so that the vertical channel is shrunk. The light dynamic penetration test feeler lever pulling device comprises the pulling fastener. The problem that in the prior art, the overall rigidity is insufficient, the clamping contact area is small and uneven, and consequently the probing rod is locally pressed excessively and deforms can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering technology, specifically relating to a lightweight dynamic penetration test probe rod pull-out fastener and device. Background Technology

[0002] The light dynamic penetration test (LTP) utilizes a certain hammer kinetic energy (10kg hammer weight) to drive a probe and rod of a specific specification into the soil. The number of blows to a certain depth is used to determine parameters such as soil properties and bearing capacity. It is a conventional and traditional in-situ test widely used in detecting, inspecting, and evaluating the bearing capacity of shallow foundation soils, the uniformity of foundation soil and cement-soil piles, soil properties, and the effectiveness of foundation treatment. It is frequently used and provides a wealth of experimental data for foundation pit inspection and acceptance.

[0003] After the light dynamic penetration test is completed, stop hammering and ensure the hammer is stationary. Existing technology uses the following methods to remove the probe rods: ① Loosen joints: Use a wrench or other tools to loosen the joints between the probe rods. Loosening the joints is a necessary step because the rods may become tighter due to friction during the penetration test. ② Pull out section by section: Starting from the top probe rod, pull out section by section. After each section is pulled out, place it on a stable surface to avoid damage.

[0004] However, in actual extraction processes, especially after continuous light dynamic penetration tests (penetration depth > 30cm, actual engineering test depth can reach 4m), the soil and rock layers tightly grip the bottom probe and the probe rod within the soil and rock layers. Often, the probe rod becomes stuck in the soil and rock layers. Generally, it is necessary to loosen the hammer pad, insert the hammer into the probe rod, tighten the hammer pad again, and continuously lift the hammer upwards to strike the bottom of the hammer pad to slowly extract the probe rod. Figure 1 As shown. The following problems exist in this process: ① The probe rod cannot be pulled out, resulting in the probe rod being left in the soil layer, causing damage and affecting the construction of the building foundation; ② The rod is bent and deformed, resulting in damage; ③ The external thread at the bottom of the hammer pad or the internal thread connecting the probe rod is deformed and loose, making it impossible to connect and causing the pulling failure; ④ The process of repeatedly lifting the hammer and hitting the bottom of the hammer pad is very labor-intensive; ⑤ There is a risk of the hammer hitting the hand.

[0005] Chinese patent CN210163873U discloses a simple manual extraction device for lightweight dynamic penetrometer tests, comprising a lever assembly, a penetrometer locking assembly, and a support. The lever assembly includes a circular steel sleeve, a V-shaped force transmission frame, a common steel pipe, and a rotating latch. The penetrometer locking assembly includes a chain, a clamping component, a wing plate, and a rotatable bolt. The support includes a rotatable pin, a support column, a fixing frame, and a support plate. The penetrometer locking assembly is connected to the lever assembly via the chain, and the support is connected to the lever assembly via the rotating pin. One end of the circular steel sleeve is fixed to the V-shaped force transmission frame, and the other end is inserted into a common steel pipe. The rotating latch is located below the circular steel sleeve. The advantage of this patent is that it reduces manpower and allows for the rapid and complete extraction of the penetrometer. However, the locking assembly of the probe rod in this patent has a complex structure, insufficient overall rigidity, and is easily damaged. In addition, the small contact area between its clamping surface and the probe rod results in uneven stress distribution. Long-term use can easily cause excessive local pressure on the probe rod, leading to deformation and still posing a risk of damaging the probe instrument. Utility Model Content

[0006] The purpose of this invention is to provide a lightweight dynamic penetration test probe rod pull-out fastener to solve the problems of insufficient overall rigidity and small and uneven clamping contact area in the existing technology, which cause excessive local pressure on the probe rod and deformation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A lightweight dynamic penetration test probe pull-out fastener includes:

[0009] The fastening block has a tapered through hole that is larger at the top and smaller at the bottom in the middle.

[0010] The clamping component is a conical structure that is larger at the top and smaller at the bottom, and a vertical channel is provided in the middle of the clamping component;

[0011] The clamping member is placed in the tapered through hole; the diameter of the bottom of the tapered through hole is greater than or equal to the outer diameter of the bottom of the clamping member and less than the outer diameter of the top of the clamping member, so that the bottom of the clamping member can fall to the bottom of the fastening block or below, without detaching from the fastening block.

[0012] The diameter of the vertical channel is variable, allowing the fastening block and the clamping member to move up and down synchronously along the probe rod. When the fastening block moves upward relative to the clamping member, it can clamp the clamping member. When the clamping member is clamped, the vertical channel narrows, preventing the clamping member from moving up and down relative to the probe rod, thereby achieving the fastening function.

[0013] In one possible implementation, the clamping element is composed of several arc-shaped clamping pieces joined together. During use, there is always a gap between the arc-shaped clamping pieces. When the fastening block moves upward, it compresses the arc-shaped clamping pieces, bringing them closer together and clamping the probe.

[0014] One possible approach is to reduce the diameter of the vertical channel to a minimum size smaller than the outer diameter of the probe, thereby enabling the fastening function.

[0015] One feasible approach is to use three arc-shaped clips. Compared to two or four clips, three clips offer the advantages of better coverage and stability, simpler manufacturing, and lower cost.

[0016] As one possible approach, the inner wall of the arc-shaped clip is provided with anti-slip textures or anti-slip stickers A, which can increase the friction between the clip and the probe rod, forming a friction locking effect and further enhancing the fastening function.

[0017] As one possible approach, the fastening block is provided with handles symmetrically on its outer wall.

[0018] Another objective of this invention is to provide a lightweight dynamic penetration test probe lifting device, including the aforementioned lifting fastener.

[0019] As one possible implementation, a lifting device is also included, which is connected to the fastening block and used to lift the fastener. The lifting device can be any existing structure with lifting capabilities, as long as it can lift the fastening block upwards.

[0020] In one possible implementation, the lifting device includes a support and a fork. The fork includes a rod and a fork. The rod is movably connected to the support, and the fork is movably connected to the fastening block. The movable connection can be a hinge or a ball joint, as long as it allows for lever movement of the fork. This invention utilizes the lever principle to lift the fastener, saving effort and increasing efficiency. Through minute lever displacement, the movement of the fastener can be precisely controlled. Furthermore, the operator maintains a safe distance from the heavy object, reducing the risk of being crushed or injured, and improving operational safety.

[0021] In one possible implementation, the fork is a U-shaped fork head, and the top surface of the U-shaped fork head is provided with a smooth arc-shaped groove with an upward opening. The arc-shaped grooves correspond to the handles, and the handles can slide along the arc-shaped grooves, thereby enabling the fastener to move up and down along the probe.

[0022] As one possible approach, the rear end of the fork is provided with anti-slip texture or anti-slip pad B.

[0023] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0024] The pull-out fastener of this utility model utilizes the inclined plane self-locking principle to achieve a fast and stable fastening function.

[0025] The present invention utilizes a probe rod pulling fastener combined with a lifting device to achieve the function of lifting the probe rod, which can quickly pull out the probe rod used for light-duty dynamic penetrometer tests, saving manpower and improving work efficiency.

[0026] The clamping component of this invention has a large contact area with the probe rod, which can basically achieve full coverage. This reduces the pressure on the probe rod during the lifting process and avoids deformation caused by excessive local pressure on the probe rod after long-term use, which could lead to damage to the probe instrument. In addition, the pull-out fastener of this invention has strong overall rigidity, is not easy to be damaged, has a long service life, and can also indirectly improve work efficiency. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of existing technology for pulling out probes;

[0028] Figure 2 This is a cross-sectional structural diagram of the pull-out fastener of this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the fastening block of this utility model;

[0030] Figure 4 This is a top view of the fastener of this utility model.

[0031] Figures 5-6 This is a top view of the clamping component of this utility model;

[0032] Figure 7 This is a cross-sectional structural diagram of the clamping component of this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the lifting device of this utility model;

[0034] Figure 9 This is a schematic diagram of the structure of the fork lever of this utility model.

[0035] The numbers and names in the diagram are as follows:

[0036] 1-Fastening block; 2-Clamping component; 3-Conical through hole; 4-Vertical channel; 5-Probe rod; 6-Arc-shaped clamp; 7-Anti-slip texture or anti-slip sticker A; 8-Support; 9-Fork rod; 10-Handle; 11-U-shaped fork head; 12-Arc-shaped groove; 13-Anti-slip texture or anti-slip sticker B. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0039] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model as appropriate to the specific circumstances.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model as appropriate to the specific circumstances.

[0041] In addition, unless otherwise stated, “multiple” or “several” means two or more. Example

[0042] A lightweight dynamic penetration test probe pull-out fastener, such as Figures 2-4As shown, the device includes a fastening block 1 and a clamping member 2. The fastening block 1 has a tapered through-hole 3 in its center, wider at the top and narrower at the bottom. The clamping member 2 is also tapered, wider at the top and narrower at the bottom, and is placed within the tapered through-hole 3. A vertical channel 4 is located in the center of the clamping member 2. The diameter of the bottom of the tapered through-hole 3 is equal to the outer diameter of the bottom of the clamping member 2 but smaller than the outer diameter of the top of the clamping member 2. This allows the bottom of the clamping member 2 to fall to the bottom of the fastening block 1 without detaching from it. When the fastening block 1 and the clamping member 2 do not move relative to each other, they can move synchronously up and down along the probe 5 to remove them from the probe. When the fastening block 1 moves upward relative to the clamping member 2, it clamps the clamping member 2, narrowing the vertical channel 4 and preventing the clamping member 2 from moving relative to the probe 5, thus achieving the fastening function. Furthermore, the clamping function is only achieved when the diameter of the vertical channel 4 is minimized to its smallest size, which is smaller than the outer diameter of the probe 5.

[0043] In this embodiment, as Figure 5 As shown, the clamping member 2 is composed of two arc-shaped clamping pieces 6 joined together. Since the diameter of the vertical channel 4 at its smallest size is smaller than the outer diameter of the probe 5, there is always a certain gap between the two arc-shaped clamping pieces 6. When the fastener 1 moves upward relative to the clamping member 2, the two arc-shaped clamping pieces 6 remain stationary in the vertical direction. However, under the clamping action of the fastener 1, the two arc-shaped clamping pieces 6 move closer to each other, the vertical channel 4 narrows, and the clamping member 2 holds the probe 5 tightly. Alternatively, a method such as... Figure 6 The three curved clips shown 6 provide a better fastening effect.

[0044] In this embodiment, the inner wall of the arc-shaped clip 6 is provided with anti-slip pads 7, such as... Figure 7 As shown.

[0045] In this embodiment, handles 10 are symmetrically provided on the outer wall of the fastening block 1 to facilitate the removal of the fastening block 1.

[0046] The specific installation and operation process of the lightweight dynamic cone penetration test probe pull-out fastener in this embodiment is as follows:

[0047] First, place the fastener 1 onto the probe 5, holding it in place. Then, insert the clamping member 2, composed of arc-shaped clamping pieces 6, into the conical through-hole 3, allowing the clamping member 2 to fall freely to its lowest point. The arc-shaped clamping pieces 6 then come together to hold the probe 5 tightly. The fastener 1, clamping member 2, and probe 5 remain relatively stationary. When the fastener 1 is subjected to an upward external force, the clamping member 2 remains stationary due to its own weight and the anti-slip pad 7, while the fastener 1 tends to move upward relative to the clamping member 2. However, since the diameter of the bottom of the conical through-hole 3 remains constant, while the outer diameter of the clamping member 2 increases from bottom to top, the fastener 1 is restricted by the clamping member 2. The clamping member 2, under the action of the fastener 1, locks the probe 5. When an upward force is continued to be applied to the fastener 1, the fastener 1 and clamping member 2 will drive the probe 5 upward and pull it out. After the probe 5 is pulled out, tapping the top outer ring of the fastening block 1 symmetrically will unlock it. Example

[0048] A lightweight dynamic cone penetration test probe lifting device, such as Figures 8-9 As shown, the fastener 1 of Embodiment 1 also includes a lifting device connected to the fastening block 1 for lifting the fastener.

[0049] In this embodiment, the lifting device includes a support 8 and a fork 9. The fork 9 includes a rod and a fork. The rod is movably connected to the support 8, and the fork is movably connected to the fastening block 1.

[0050] In this embodiment, the fork of the fork 9 is a U-shaped fork head 11. The top of the U-shaped fork head 11 is provided with a smooth arc groove 12 with an upward opening, and the handle 10 can be placed in the arc groove 12.

[0051] In this embodiment, the rear end of the fork 9 is provided with anti-slip texture 13.

[0052] The specific usage method of the lightweight dynamic cone penetration test probe pulling device in this embodiment is as follows:

[0053] like Figure 8As shown, first, fastener 1 is placed on probe 5 to hold it in place. Then, clamping member 2, composed of arc-shaped clamping pieces 6, is placed in the conical through hole 3, allowing clamping member 2 to fall freely to the lowest point. The arc-shaped clamping pieces 6 move closer together to hold probe 5 tightly. Fastener 1, clamping member 2, and probe 5 are relatively stationary. The U-shaped fork head 11 of the lifting device is placed below the handle 10 of fastener 1, so that the handle 10 is placed in the arc-shaped groove 12. When the operator presses down on the rear end of fork 9, fork 9 rotates based on support 8. Based on the lever principle, U-shaped fork head 11 moves upward, and the handle... 10 slides within the arc-shaped groove 12. The fastener 1 is subjected to an upward pushing force. The clamping part 2 remains stationary due to its own weight and the anti-slip pad 7. The fastener 1 tends to move upward relative to the clamping part 2. However, since the diameter of the bottom of the tapered through hole 3 remains constant, while the outer diameter of the clamping part 2 increases from bottom to top, the fastener 1 is restricted by the clamping part 2. Under the action of the fastener 1, the clamping part 2 locks the probe 5. When the fork 9 continues to press down and applies an upward force to the fastener 1, the fastener 1 and the clamping part 2 will drive the probe 5 to rise and be pulled out. After the probe 5 is pulled out, the top outer ring of the fastening block 1 can be unlocked by symmetrically tapping it.

[0054] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention.

Claims

1. A lightweight dynamic cone penetration test probe pull-out fastener, characterized in that, include: Fastening block (1), wherein a tapered through hole (3) with a larger upper part and a smaller lower part is provided in the middle of the fastening block (1); The clamping member (2) is a cone-shaped structure that is larger at the top and smaller at the bottom, with a vertical channel (4) in the middle; the diameter of the vertical channel (4) is variable. The clamping member (2) is placed inside the tapered through hole (3); the diameter of the bottom of the tapered through hole (3) is greater than or equal to the outer diameter of the bottom of the clamping member (2) but smaller than the outer diameter of the top of the clamping member (2); When the fastening block (1) moves upward relative to the clamping member (2), it clamps the clamping member (2) and reduces the vertical channel (4).

2. The lightweight dynamic penetration test probe pull-out fastener as described in claim 1, characterized in that: In its natural state, the diameter of the vertical channel (4) is greater than the outer diameter of the probe (5); in its compressed state, the diameter of the vertical channel (4) is less than the outer diameter of the probe (5).

3. The lightweight dynamic penetration test probe pull-out fastener as described in claim 1 or 2, characterized in that: The clamping component (2) is composed of several arc-shaped clamping pieces (6) spliced ​​together.

4. The lightweight dynamic penetration test probe pull-out fastener as described in claim 3, characterized in that: The inner wall of the arc-shaped clip (6) is provided with anti-slip texture or anti-slip sticker A (7).

5. The lightweight dynamic penetration test probe pull-out fastener as described in claim 1, characterized in that: The fastening block (1) is provided with handles (10) symmetrically on its outer wall.

6. A lightweight dynamic cone penetration test probe pulling device, characterized in that: Includes the pull-out fastener as described in any one of claims 1 to 5.

7. The lightweight dynamic cone penetration test probe pulling device as described in claim 6, characterized in that: It also includes a lifting device, which is connected to the fastening block (1) and is used to lift the fastener.

8. The lightweight dynamic cone penetration test probe pulling device as described in claim 7, characterized in that: The lifting device includes a support (8) and a fork (9). The fork (9) includes a rod and a fork. The rod is movably connected to the support (8), and the fork is movably connected to the fastening block (1).

9. The lightweight dynamic cone penetration test probe pulling device as described in claim 8, characterized in that: The fork is a U-shaped fork head (11), and the top of the U-shaped fork head (11) is provided with an upward-opening arc groove (12), and the handle (10) can be placed in the arc groove (12).

10. The lightweight dynamic cone penetration test probe pulling device as described in claim 8, characterized in that: The rear end of the fork (9) is provided with anti-slip texture or anti-slip sticker B (13).

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